阅读说明：本技术 电池管理装置、车辆以及控制车辆的方法 (Battery management device, vehicle, and method of controlling vehicle ) 是由 闵敬仁 于 2020-11-23 设计创作，主要内容包括：本发明涉及电池管理装置、车辆以及控制车辆的方法。一种控制具有电动机、发动机和电池的车辆的方法,该方法包括：检测设置在电池中的多个电池单元的各自的电压值；在多个电池单元的电压值中识别最大电压值和最小电压值；获得识别出的最大电压值和最小电压值之间的电压偏差值；获得电池的劣化率；基于电压偏差值或电池的劣化率中的至少一者获得电池的功率极限值；基于获得的功率极限值和预设权重获得最终功率极限值；并且基于获得的最终功率极限值控制电池的放电。(The invention relates to a battery management apparatus, a vehicle, and a method of controlling the vehicle. A method of controlling a vehicle having a motor, an engine, and a battery, the method comprising: detecting respective voltage values of a plurality of battery cells provided in a battery; identifying a maximum voltage value and a minimum voltage value among voltage values of a plurality of battery cells; obtaining a voltage deviation value between the identified maximum voltage value and the minimum voltage value; obtaining a degradation rate of the battery; obtaining a power limit value of the battery based on at least one of the voltage deviation value or a degradation rate of the battery; obtaining a final power limit value based on the obtained power limit value and a preset weight; and controlling the discharge of the battery based on the obtained final power limit value.)

1. A battery management apparatus comprising:

a battery having a plurality of battery cells;

a voltage detector configured to detect respective voltage values of the plurality of battery cells and output voltage information on the detected voltage values;

a storage device configured to store a first map in which power limit values corresponding to voltage deviation values are matched; and

a management controller configured to:

identifying a maximum voltage value and a minimum voltage value among the voltage values of the plurality of battery cells,

obtaining a voltage deviation value between the maximum voltage value and the minimum voltage value,

obtaining a first power limit value of the battery corresponding to the voltage deviation value based on the first mapping, an

Controlling discharge of the battery based on a first power limit value of the battery.

2. The battery management apparatus of claim 1, further comprising:

a communication device configured to transmit a first power limit value of the battery to a vehicle controller in response to a control command of the management controller.

3. The battery management apparatus of claim 1, wherein when the voltage deviation value exceeds a first reference value, the management controller is further configured to obtain a first final power limit value based on a first power limit value of the battery and a preset weight.

4. The battery management apparatus of claim 3, wherein, when controlling the discharge of the battery based on the first final power limit value, the management controller is further configured to:

identifying a minimum voltage value among the voltage values of the plurality of battery cells, and

and when the minimum voltage value is smaller than a second reference value, updating the preset weight.

5. The battery management apparatus of claim 4, wherein, when updating the preset weight, the management controller is further configured to:

updating the preset weight based on a set value and a first predetermined ratio when the minimum voltage value is less than the second reference value and a subtracted value obtained by subtracting the minimum voltage value from the second reference value exceeds a third reference value, an

Updating the preset weight based on the set value and a second predetermined ratio when the subtracted value is less than or equal to the third reference value.

6. The battery management apparatus of claim 1, wherein:

the storage device is further configured to store a second map in which power limit values respectively corresponding to degradation rates of the batteries are matched; and

the management controller is further configured to:

obtaining a degradation rate of the battery when the voltage deviation value is less than or equal to a first reference value,

obtaining a second power limit value corresponding to the degradation rate of the battery based on the second map when the degradation rate of the battery exceeds a reference degradation rate, an

A second final power limit value is obtained based on the second power limit value and a preset weight.

7. The battery management apparatus of claim 6, wherein when controlling discharge of the battery based on the second final power limit value, the management controller is further configured to:

identifying a minimum voltage value among the voltage values of the plurality of battery cells, and

and when the minimum voltage value is smaller than a second reference value, updating the preset weight.

8. The battery management apparatus of claim 7, wherein, when updating the preset weight, the management controller is further configured to:

updating the preset weight based on a set value and a first predetermined ratio when the minimum voltage value is less than the second reference value and a subtracted value obtained by subtracting the minimum voltage value from the second reference value exceeds a third reference value, an

Updating the preset weight based on the set value and a second predetermined ratio when the subtracted value is less than or equal to the third reference value.

9. The battery management apparatus of claim 6, wherein:

the storage device is further configured to store a third map in which power limit values respectively corresponding to voltage values of the battery are matched; and

when the voltage deviation value is less than or equal to the first reference value and a degradation rate of the battery is less than or equal to the reference degradation rate, the degradation rate is determined to be a normal state of the battery by being less than or equal to the reference degradation rate, the management controller being further configured to:

obtaining a third power limit value corresponding to a normal state of the battery based on the third mapping, and

obtaining a third final power limit value based on the third power limit value and the preset weight.

10. The battery management apparatus of claim 9, wherein when controlling the discharge of the battery based on the third final power limit value, the management controller is further configured to:

identifying a minimum voltage value among the voltage values of the plurality of battery cells, and

and updating the preset weight when the identified minimum voltage value is smaller than a second reference value.

11. The battery management apparatus of claim 10, wherein when updating the preset weight, the management controller is further configured to:

updating the preset weight based on a set value and a first predetermined ratio when the minimum voltage value is less than the second reference value and a subtracted value obtained by subtracting the minimum voltage value from the second reference value exceeds a third reference value, an

Updating the preset weight based on the set value and a second predetermined ratio when the subtracted value is less than or equal to the third reference value.

12. The battery management apparatus according to claim 6, wherein when the degradation rate of the battery exceeds the reference degradation rate, the management controller is further configured to:

obtaining an output decrease time corresponding to a deterioration rate of the battery,

obtaining a current output available time of the battery based on a reference output available time and the output reduction time, an

Controlling discharge of the battery based on the current output available time.

13. A vehicle, comprising:

wheels that use at least one of power of a motor and power of an engine as driving force;

a battery having a plurality of battery cells and configured to supply power to the motor;

a voltage detector configured to detect respective voltage values of the plurality of battery cells and output voltage information on the detected voltage values;

a storage device configured to store a first map in which power limit values corresponding to voltage deviation values are matched;

a battery management apparatus comprising a processor configured to:

identifying a maximum voltage value and a minimum voltage value among the voltage values of the plurality of battery cells,

obtaining a voltage deviation value between the maximum voltage value and the minimum voltage value and a first power limit value of the battery corresponding to the voltage deviation value based on the first mapping, an

When the voltage deviation value exceeds a first reference value, obtaining a first final power limit value based on a first power limit value and a preset weight of the battery; and

a controller configured to control operation of at least one of the electric motor, the battery, and the engine, and to control discharge of the battery based on the first final power limit value obtained from the battery management device.

14. The vehicle according to claim 13, wherein:

the storage device is further configured to store a second map in which power limit values respectively corresponding to degradation rates of the batteries are matched; and

the processor of the battery management apparatus is further configured to:

obtaining a degradation rate of the battery when the voltage deviation value is less than or equal to a first reference value,

obtaining a second power limit value corresponding to the degradation rate of the battery based on the second map when the degradation rate of the battery exceeds a reference degradation rate, an

Obtaining a second final power limit value based on the second power limit value and the preset weight.

15. The vehicle according to claim 14, wherein:

the storage device is further configured to store a third map in which power limit values respectively corresponding to voltage values of the battery are matched; and

when the voltage deviation value is less than or equal to the first reference value and the degradation rate of the battery is less than or equal to the reference degradation rate, the degradation rate is determined to be a normal state of the battery, and the processor of the battery management apparatus is further configured to:

obtaining a third power limit value corresponding to a normal state of the battery based on the third mapping, and

obtaining a third final power limit value based on the third power limit value and the preset weight.

16. The vehicle of claim 15, wherein when controlling the discharge of the battery, the processor of the battery management device is further configured to:

identifying a minimum voltage value among the voltage values of the plurality of battery cells, and

and updating the preset weight when the identified minimum voltage value is smaller than a second reference value.

17. The vehicle of claim 16, wherein, when updating the preset weight, the processor of the battery management device is further configured to:

updating the preset weight based on a set value and a first predetermined ratio when the minimum voltage value is less than the second reference value and a subtracted value obtained by subtracting the minimum voltage value from the second reference value exceeds a third reference value, an

Updating the preset weight based on the set value and a second predetermined ratio when the subtracted value is less than or equal to the third reference value.

18. The vehicle according to claim 14, wherein when the degradation rate of the battery exceeds the reference degradation rate, the processor of the battery management device is further configured to obtain an output reduction time corresponding to the degradation rate of the battery, to obtain a current output available time of the battery based on a reference output available time and the output reduction time, and to transmit the current output available time to the controller.

19. A method of controlling a vehicle including a motor, an engine, and a battery, the method comprising:

detecting respective voltage values of a plurality of battery cells provided in the battery;

identifying a maximum voltage value and a minimum voltage value among voltage values of the plurality of battery cells;

obtaining a voltage deviation value between the maximum voltage value and the minimum voltage value;

obtaining a degradation rate of the battery;

obtaining a power limit value of the battery based on at least one of a voltage deviation value and a degradation rate of the battery;

obtaining a final power limit value based on the power limit value and a preset weight; and

controlling discharge of the battery based on the final power limit value.

20. The method of claim 19, wherein obtaining the power limit value for the battery comprises:

obtaining a power limit value corresponding to the voltage deviation value based on a first mapping in which the power limit value is matched when the voltage deviation value exceeds a first reference value;

obtaining power limit values respectively corresponding to degradation rates of the batteries based on a second map in which the power limit values are matched when the voltage deviation value is less than or equal to the first reference value and the degradation rate of the battery exceeds a reference degradation rate; and

when the voltage deviation value is less than or equal to the first reference value and the degradation rate of the battery is less than or equal to the reference degradation rate, the power limit values are obtained based on a third map in which power limit values respectively corresponding to voltage values of the battery are matched.

21. The method of claim 19, further comprising:

when controlling discharge of the battery, a minimum voltage value is identified among voltage values of the plurality of battery cells, and the preset weight is updated when the identified minimum voltage value is less than a second reference value.

Technical Field

The present invention relates to a battery management apparatus for preventing deterioration of a battery, a vehicle having the battery management apparatus, and a method of controlling the vehicle.

Background

Vehicles control starting by using a battery, and when starting is completed, vehicles include motor vehicles (internal combustion engine-driven automobiles) driven by mechanical power generated by burning fuel such as gasoline and diesel oil, and environmentally friendly vehicles driven by electric power to reduce harmful fuel emissions and improve fuel efficiency.

Environmentally friendly vehicles include electric vehicles, hybrid vehicles, and hydrogen fuel cell vehicles; an electric vehicle has a rechargeable power source constituted by a battery and an electric motor, rotates the electric motor using electric power charged in the battery, and drives wheels using rotation of a drive motor; the hybrid vehicle has an engine, a battery, and a motor and is driven by controlling mechanical power of the engine and electric power of a driving motor.

Unlike other mechanical components, batteries for eco-friendly vehicles have a characteristic of degrading performance when used.

More specifically, as the travel distance of the vehicle increases, the performance of many battery cells (cells) constituting the battery (battery) gradually deteriorates, and the voltage characteristic curve between each battery cell changes even if the same current is used when the performance decreases. At this time, an error in the state of charge (SOC) occurs between each battery cell, and for this reason, the battery rapidly deteriorates, resulting in a problem that the battery life is shorter than expected.

Although the performance of the battery is degraded, it does not mean that it cannot be used, but there is a problem of inconvenience to the user in terms of vehicle driving.

The information disclosed in the background section above is for background to aid in understanding the present invention and should not be taken as an acknowledgement that the information forms any part of the prior art.

Disclosure of Invention

An aspect of the present invention is to provide a battery management apparatus that adjusts a power limit value of a battery based on voltage values of a plurality of battery cells of the battery and a degradation rate of the battery, a vehicle having the battery management apparatus, and a method of controlling the vehicle.

Another aspect of the present invention is to provide a battery management apparatus that updates a weight for adjusting a power limit value based on voltage values of a plurality of battery cells of a battery and adjusts a usage time of the battery based on a degradation rate of the battery, a vehicle having the battery management apparatus, and a method of controlling the vehicle.

Additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.

According to an aspect of the present invention, a battery management apparatus includes: a battery having a plurality of battery cells; a voltage detector configured to detect respective voltage values of the plurality of battery cells and output voltage information on the detected voltage values; a storage device configured to store a first map in which power limit values corresponding to the voltage deviation values are matched; and a management controller configured to identify a maximum voltage value and a minimum voltage value among the voltage values of the plurality of battery cells, to obtain a voltage deviation value between the maximum voltage value and the minimum voltage value, to obtain a first power limit value of the battery corresponding to the voltage deviation value based on the first map, and to control discharge of the battery based on the first power limit value of the battery.

The battery management device may further include a communication device configured to transmit the first power limit value of the battery to the vehicle controller in response to a control command of the management controller.

When the voltage deviation value exceeds the first reference value, the management controller may be configured to obtain a first final power limit value based on the first power limit value of the battery and a preset weight.

When controlling the discharge of the battery based on the first final power limit value, the management controller may be configured to identify a minimum voltage value among the voltage values of the plurality of battery cells, and update the preset weight when the minimum voltage value is less than the second reference value.

When updating the preset weights, the management controller may be configured to: the preset weight is updated based on the set value and the first predetermined ratio when the minimum voltage value is less than the second reference value and a value obtained by subtracting the minimum voltage value from the second reference value exceeds a third reference value, and the preset weight is updated based on the set value and the second predetermined ratio when the value obtained after the subtraction is less than or equal to the third reference value.

The storage device may be configured to store a second map in which power limit values respectively corresponding to degradation rates of the batteries are matched. The management controller may be configured to: the method further includes obtaining a degradation rate of the battery when the voltage deviation value is less than or equal to a first reference value, obtaining a second power limit value corresponding to the degradation rate of the battery based on a second map when the degradation rate of the battery exceeds a reference degradation rate, and obtaining a second final power limit value based on the second power limit value and a preset weight.

When controlling the discharge of the battery based on the second final power limit value, the management controller may be configured to identify a minimum voltage value among the voltage values of the plurality of battery cells, and update the preset weight when the minimum voltage value is less than the second reference value.

When updating the preset weights, the management controller may be configured to: the preset weight is updated based on the set value and the first predetermined ratio when the minimum voltage value is less than the second reference value and a value obtained by subtracting the minimum voltage value from the second reference value exceeds a third reference value, and the preset weight is updated based on the set value and the second predetermined ratio when the value obtained after the subtraction is less than or equal to the third reference value.

The storage device may be configured to store a third map in which power limit values respectively corresponding to voltage values of the batteries are matched. When the voltage deviation value is less than or equal to the first reference value and the obtained degradation rate of the battery is less than or equal to the reference degradation rate, it is determined as a normal state of the battery, and the management controller may be configured to obtain a third power limit value corresponding to the normal state of the battery based on a third map, and obtain a third final power limit value based on the third power limit value and a preset weight.

When controlling the discharge of the battery based on the third final power limit value, the management controller may be configured to identify a minimum voltage value among the voltage values of the plurality of battery cells, and update the preset weight when the minimum voltage value is less than the second reference value.

When updating the preset weights, the management controller may be configured to: the preset weight is updated based on the set value and the first predetermined ratio when the minimum voltage value is less than the second reference value and a value obtained by subtracting the minimum voltage value from the second reference value exceeds a third reference value, and the preset weight is updated based on the set value and the second predetermined ratio when the value obtained after the subtraction is less than or equal to the third reference value.

When the obtained degradation rate of the battery exceeds the reference degradation rate, the management controller may be configured to obtain an output reduction time corresponding to the degradation rate of the battery, to obtain a current output available time of the battery based on the reference output available time and the output reduction time, and to control discharge of the battery based on the current output available time.

According to another aspect of the present invention, a vehicle includes: a wheel that uses at least one of power of the motor and power of the engine as driving power; a battery having a plurality of battery cells and configured to supply power to the motor; a voltage detector configured to detect respective voltage values of the plurality of battery cells and output voltage information on the detected voltage values; a storage device configured to store a first map in which power limit values corresponding to the voltage deviation values are matched; a battery management apparatus including a processor configured to identify a maximum voltage value and a minimum voltage value among voltage values of a plurality of battery cells, obtain a voltage deviation value between the maximum voltage value and the minimum voltage value and a first power limit value of a battery corresponding to the voltage deviation value based on a first mapping, and obtain a first final power limit value based on a first power limit value of the battery and a preset weight when the voltage deviation value exceeds a first reference value; and a controller configured to control operation of at least one of the motor, the battery, and the engine, and to control discharge of the battery based on a first final power limit value obtained from the battery management device.

The storage device may be configured to store a second map in which power limit values respectively corresponding to degradation rates of the batteries are matched. The processor of the battery management apparatus may be configured to: the method further includes obtaining a degradation rate of the battery when the obtained voltage deviation value is less than or equal to a first reference value, obtaining a second power limit value corresponding to the degradation rate of the battery based on a second map when the degradation rate of the battery exceeds a reference degradation rate, and obtaining a second final power limit value based on the second power limit value and a preset weight.

The storage device may be configured to store a third map in which power limit values respectively corresponding to voltage values of the batteries are matched. When the voltage deviation value is less than or equal to the first reference value and the degradation rate of the battery is less than or equal to the reference degradation rate, it is determined as the normal state of the battery, and the processor of the battery management device may be configured to obtain a third power limit value corresponding to the normal state of the battery based on the third map and obtain a third final power limit value based on the third power limit value and a preset weight.

When controlling the discharge of the battery, the processor of the battery management apparatus may be configured to identify a minimum voltage value among the voltage values of the plurality of battery cells, and update the preset weight when the minimum voltage value is less than the second reference value.

When updating the preset weights, the processor of the battery management apparatus may be configured to: the preset weight is updated based on the set value and the first predetermined ratio when the minimum voltage value is less than the second reference value and a value obtained by subtracting the second reference value from the minimum voltage value exceeds a third reference value, and the preset weight is updated based on the set value and the second predetermined ratio when the value obtained after the subtraction is less than or equal to the third reference value.

When the obtained degradation rate of the battery exceeds the reference degradation rate, the processor of the battery management apparatus may be configured to obtain an output reduction time corresponding to the degradation rate of the battery, to obtain a current output available time of the battery based on the reference output available time and the output reduction time, and to transmit the current output available time to the controller.

According to another aspect of the present invention, in a method of controlling a vehicle, the vehicle includes a motor, an engine, and a battery. The method includes detecting respective voltage values of a plurality of battery cells provided in a battery; identifying a maximum voltage value and a minimum voltage value among voltage values of a plurality of battery cells; obtaining a voltage deviation value between the identified maximum voltage value and the minimum voltage value; obtaining a degradation rate of the battery; obtaining a power limit value of the battery based on at least one of the voltage deviation value and a degradation rate of the battery; obtaining a final power limit value based on the power limit value and a preset weight; controlling discharge of the battery based on the final power limit value.

Obtaining the power limit value of the battery may include: obtaining a power limit value based on a first mapping in which the power limit value corresponding to the voltage deviation value is matched when the voltage deviation value exceeds a first reference value; obtaining power limit values based on second maps in which power limit values respectively corresponding to the degradation rates of the batteries are matched, when the voltage deviation value is less than or equal to a first reference value and the degradation rate of the battery exceeds a reference degradation rate; and when the voltage deviation value is less than or equal to the first reference value and the degradation rate of the battery is less than or equal to the reference degradation rate, obtaining the power limit values based on a third map in which the power limit values respectively corresponding to the voltage values of the battery are matched.

The method may further comprise: when controlling the discharge of the battery, a minimum voltage value is identified among the voltage values of the plurality of battery cells, and the preset weight is updated when the identified minimum voltage value is less than a second reference value.

Drawings

These and/or other aspects of the present invention will become apparent and more readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a view illustrating a chassis of a vehicle according to an exemplary embodiment of the present invention.

Fig. 2 is a control block diagram of a vehicle according to an exemplary embodiment of the present invention.

Fig. 3 is a control block diagram of the battery management apparatus shown in fig. 2.

Fig. 4 is a control flowchart of a vehicle according to an exemplary embodiment of the invention.

Fig. 5 is a control flowchart of updating weights during vehicle control according to an exemplary embodiment of the present invention.

Fig. 6 is a graph of voltage values corresponding to a usage time of a battery of a vehicle according to an exemplary embodiment of the present invention.

Detailed Description

Like reference numerals refer to like elements throughout the specification. Not all elements of the embodiments of the present invention will be described, and descriptions of components that are known in the art or overlap each other in the exemplary embodiments will be omitted. Terms used throughout this specification, such as "component," "module," "member," "block," and the like, may be implemented in software and/or hardware, while multiple "components," "modules," "members," "blocks" may be implemented in a single element, or a single "component," "module," "member," "block" may include multiple elements.

It will also be appreciated that the term "connected," and its derivatives, refer to both direct and indirect connections, and that indirect connections include connections through a wireless communication network.

Unless otherwise mentioned, the term "comprising" is inclusive or open-ended and does not exclude additional unrecited elements or method steps. It will also be understood that the term "member" and its derivatives refer to both the case where a member is in contact with another member and the case where another member is present between the two members.

It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section.

It is understood that the singular forms "a," "an," and "the" include plural references unless the context clearly dictates otherwise.

Reference numerals for method steps are used for convenience of illustration only and do not limit the order of the steps. Thus, the written order may be implemented in other ways, unless the context clearly dictates otherwise.

Hereinafter, the operational principle and embodiments of the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a view illustrating a chassis of a vehicle according to an exemplary embodiment of the present invention.

The vehicle 1 according to the embodiment is a hybrid vehicle that is driven by an engine, a battery, and a motor and controls mechanical power of the engine and electric power of the motor.

The vehicle may comprise a body with external and internal components and a chassis, which is a component of the vehicle 1 other than the body, on which mechanical devices required for travel are mounted.

Referring to fig. 1, the powertrain 140 may include an engine 142, a fuel system, a cooling system, a fueling system, a battery 143, a motor 144, a generator 145, an inverter 146, a clutch 147, a transmission 148, and a final reduction and differential gear 149, and further includes an actuator 147a for driving the clutch 147.

The engine 142 may burn fuel such as gasoline and diesel to generate mechanical power, and transmit the power to the clutch 147.

The battery 143 may generate electric power having a high-voltage current and supply the electric power to the motor 144, the generator 145, and various electric devices in the vehicle.

Various electrical devices in a vehicle may include vehicle terminals, audio devices, and lights.

The battery 143 may be charged by receiving power supplied from the generator 145.

The battery 143 may include a plurality of battery cells 143 a.

The battery 143 may be managed by the battery management device 160. The battery management device 160 will be described later.

The battery 143 may include a battery capable of being charged and discharged.

The number of batteries provided in the vehicle may be one or two.

For example, the vehicle may include: a main battery that provides a driving force to a power train including the motor 144; and an auxiliary battery that provides driving force to electronic devices such as convenience devices and additional devices.

The main battery may be charged using electric power generated by a generator driven during regenerative braking, and the auxiliary battery may be charged using electric power charged in the main battery.

The motor 144 may generate a rotational force (also referred to as rotational power) using electric energy from the battery 143 and transmit the rotational force to the wheel 141 to drive the wheel 141.

Once connected to the engine 142 through the clutch 147, the motor 144 transmits its rotational force to the wheels 141 together with the rotational force of the engine 142. The motor 144 may also perform the function of absorbing shocks from the closing of the clutch 147 while performing the function of a conventional torque converter.

In addition, the motor 144 may convert the electric energy of the battery 143 into mechanical energy for operating various electric devices provided in the vehicle.

The motor 144 may function as a generator in a regenerative braking mode due to braking, deceleration, or low speed drive, thereby enabling the battery 143 to be charged.

A generator 145, such as a Hybrid Starter Generator (HSG), may be connected to the crankshaft of engine 142, engaged with the crankshaft of engine 142, and may function as a starter motor when engine 142 is started, and may be operated by engine 142 as a generator to enable charging of battery 143 when wheels 141 are not driven by engine 142.

In some exemplary embodiments, the generator 145 may act as a generator by the power transmitted by the engine 142, thereby enabling the battery 143 to be charged.

The vehicle may also charge the battery 143 by receiving and using power from a charger located in a parking lot or a charging station.

The power system 140 of the vehicle may further include a power converter for converting electric power generated by the generator 145 into chargeable electric power of the battery 143 and converting electric power of the battery 143 into driving power of the generator 145. The power converter may be a converter.

The power converter may also perform the function of changing the direction and output of current between the generator 145 and the battery 143.

The inverter 146 may convert the electric power from the battery 143 into driving power of the motor 144.

The inverter 146 may output driving power for the motor 144 based on a target speed from a user command. The driving power of the motor 144 may be a switching signal for outputting a current corresponding to the target speed and a switching signal for outputting a voltage corresponding to the target speed.

Accordingly, the inverter 146 may include a plurality of switching devices.

A clutch 147 may be disposed between the engine 142 and the motor 144.

The clutch 147 may be closed or locked when both the engine 142 and the motor 144 are used to generate the driving force for the wheels 141, and may be opened by a spring being pushed back by hydraulic pressure generated by driving of an actuator, such as a Hydraulic Clutch Actuator (HCA), when the driving force for the wheels 141 is generated using only the motor 144.

That is, the clutch 147 may be in an open state or a closed state depending on the driving mode of the vehicle.

More specifically, when deceleration running or low-speed running is performed using the motor 144, the clutch 147 may be opened, and even when braking is performed, the clutch 147 may be opened. When traveling uphill, clutch 147 may be closed. Acceleration running and constant speed running at or above a certain speed are performed, and may be closed when the battery 143 is in the protection mode.

The clutch 147 may be a normally closed clutch that connects the engine 142 and the motor 144 when the vehicle power is disconnected.

The transmission 148 may transmit the rotational motion of the engine 142 and the motor 144 to the wheels 141 or transmit the rotational motion of the motor 144 to the wheels 141.

The transmission 148 may be a Dual Clutch Transmission (DCT) that uses two clutch-operated gears.

The transmission 148 automatically performs an optimal torque conversion by enabling gears to be automatically manipulated based on the travel speed of the vehicle.

The vehicle may further include a final reduction and differential gear (FD)149 disposed between the transmission 148 and the wheels 141.

The FD may include a final reduction gear and a differential gear.

The final reduction gear may convert revolutions per minute (rpm) of the motor 144 such that the traveling speed of the vehicle reaches a target speed. That is, the final reduction gear may generate the driving force corresponding to the converted rpm of the motor 144 and transmit the generated driving force to the left and right wheels 141 and 141, respectively.

The final reduction can also convert the input rpm of the motor 144 to a certain ratio.

Here, the target speed may be a speed corresponding to the pressurization of the accelerator pedal or the brake pedal.

The final reduction gear may include a drive pinion and a ring gear, and may reduce the rotation speed and change the rotation direction to a right angle. That is, the final reduction device can increase the driving force by again reducing the speed between the transmission 148 and the wheels 141, and at the same time, change the direction of power transmission.

In the final reduction gear, the driving pinion may receive the rotational force of the propeller shaft 148a and change it to an angle close to a right angle while decelerating it and transmitting it to the differential gear. The final reduction gear may transmit the changed rotational force of the propeller shaft to the rear shaft and increase the rotational force through the final reduction.

The differential gear may cause the left wheel 141 and the right wheel 141 to rotate at different speeds.

That is, the differential gear may generate the driving forces of the left and right wheels 141 and 141 by adjusting the gear ratio of the transmission 148 and transmit the generated driving forces to the left and right wheels 141 and 141, respectively.

In this embodiment, the powertrain 140 may have a parallel configuration in which both the engine 142 and the motor 144 are connected to the axle 149a of the vehicle to simultaneously drive the vehicle.

In an Electric Vehicle (EV) mode, in which the vehicle is driven only by the motor 144, the vehicle opens the clutch 147 to prevent the motor 144 and the engine 142 from being mechanically connected, thereby directly transmitting the rotation of the motor 144 to the transmission 148. At this time, the motor 142 may be turned off and may be driven while the battery is charged.

Further, the vehicle closes the clutch 147 (in a Hybrid Electric Vehicle (HEV) mode) while being driven by the operation of both the engine 142 and the motor 144 to add the rotational force of the engine 142 to the rotational force of the motor 144, and then to the transmission 148.

Even when the vehicle is driven by only the engine 142, since the engine 142 needs to be connected to the axle 149a, the vehicle closes the clutch 147 to rotate the engine 142 together with the motor 144.

Fig. 2 is a control block diagram of a vehicle according to an exemplary embodiment of the present invention, and fig. 3 is a control block diagram of a battery management apparatus shown in fig. 2.

Referring to fig. 2, the vehicle may include a speed detector 111, a first pressure detector 112, a second pressure detector 113, a display 120, and a controller 130.

The vehicle may further include a battery management device 160, and the battery management device 160 monitors a state of charge (SOC) and an abnormal state of the battery 143 and outputs state information for monitoring.

The speed detector 111 may detect a speed of the vehicle and output travel speed information about the detected speed.

The speed detector 111 may include a wheel speed sensor provided on each of the front, rear, left, and right wheels to detect a rotation speed of each wheel 141, or may include an acceleration detector for detecting an acceleration of the vehicle.

The first pressure detector 112 may detect a pressure applied to the accelerator pedal and output first pressure information regarding the detected pressure.

The second pressure detector 113 may detect pressure applied to the brake pedal and output second pressure information regarding the detected pressure.

The first pressure detector 112 and the second pressure detector 113 may be pressure sensors.

The display 120 may display the EV mode using only the power of the motor 144, and may display the HEV mode using the power of the engine 142 and the motor 144.

The display 120 may also display information about the low voltage state of the battery 143.

That is, the display 120 may display information about the abnormal state of the battery 143.

In addition, the display 120 may be a display provided in the host unit, a display provided in the dashboard, or a display provided in the user interface.

The display 120 may be a lamp, such as a Light Emitting Diode (LED), separately provided in the vehicle interior.

The controller 130 may obtain the power required of the user based on the first pressure information or the second pressure information and the traveling speed (i.e., vehicle speed) information, obtain a target traveling speed of the vehicle corresponding to the obtained power requested by the user, and control the operation of at least one of the engine 142 and the motor 144 based on the obtained target traveling speed of the vehicle. By so doing, the vehicle can be driven by the power generated by at least one of the engine 142 and the motor 144.

The controller 130 may control the execution of an EV mode for driving the vehicle using only the power of the motor 144 based on the target running speed, acceleration running, and hill-climbing running of the vehicle, and may control the execution of an HEV mode for driving the vehicle using the power of the motor 144 and the engine 142.

The controller 130 may control the operation of the motor in the actuator 147a to control the closing of the clutch 147, and control the pressure of the fluid supplied to the clutch 147 to open and close the clutch 147, so that driving in the EV mode and the HEV mode may be performed.

When the clutch 147 is of the normally closed type, the configuration of the controller 130 of the embodiment will be described.

When the driving mode is the EV mode, the controller 130 may control the clutch 147 to be opened and control the rotation speed of the motor 144 based on the target running speed.

When controlling the speed of the motor 144, the controller 130 may control the switching of the inverter 146.

When the travel mode is the HEV mode, the controller 130 may control the clutch 147 to the closed state, and control the rotation speed of the engine 142 and the rotation speed of the motor 144 based on the target travel speed.

When the driving mode is the HEV mode, the controller 130 may control the operation of the generator 145 to start the engine 142 and control the driving of the engine 142.

The controller 130 may communicate with the battery management device 160 while traveling in the HEV mode, and may receive state information of the battery 143 from the battery management device 160.

Here, the state information of the battery 143 may include charge state information of the battery 143 and abnormal state information of the battery 143. The SOC of the battery 143 may include a charged amount of the battery 143.

The state information of the battery 143 may include an SOC of the battery 143 and a voltage value of the battery 143, and may further include at least one power limit value among power limit values of the battery 143.

Here, the power limit value of the battery 143 may be power available through the battery 143 when power required by a user is constant during discharge of the battery 143 or when a reference power is preset.

When traveling in the EV mode, the controller 130 may determine whether to switch to the HEV mode based on a power limit value of the battery 143 and a target traveling speed, and when it is determined that the controller 130 needs to switch to the HEV mode, the controller 130 may control closing of the clutch 147 installed between the engine 142 and the motor 144 and limit the output of the motor 144 based on a limit power value of the battery 143 when the battery 143 is discharged.

The controller 130 may control the operation of the generator 145 based on the SOC of the battery 143 and the temperature of the battery 143 when running in the EV mode or the HEV mode to operate the engine 142, and may charge the battery 143 by causing the generator 145 to perform a function as the generator 145 with the operation of the engine 142.

The controller 130 may receive information on the current output available time of the battery 143 from the battery management device 160 and control the operations of the power system 140 and the electronic devices based on the received information on the current output available time of the battery 143.

When the clutch 147 is in the closed state, the engine 142 may transmit the generated power to the wheels 141 and the generator 145.

The generator 145 may charge the battery 143 when the engine 142 is started based on a control command of the controller 130 or a function as a generator is performed by the power of the engine 142.

The inverter 146 may convert DC power supplied from the battery 143 into three-phase AC power based on a control command of the controller 130 and apply the converted AC power to the motor 144.

The actuator 147a may move oil to the clutch 147 by driving a motor provided therein to generate hydraulic pressure in the clutch 147. At this time, the clutch 147 may be opened while the spring in the clutch 147 is pushed by the hydraulic pressure generated therein.

The controller 130 according to an exemplary embodiment of the present invention may include: a non-transitory memory storing an algorithm for controlling operation of components in the vehicle or data regarding a program implementing the algorithm; and a processor that performs the aforementioned operations using data stored in the memory. The memory and the processor may be implemented in separate chips. Alternatively, the memory and the processor may be implemented in a single chip.

The controller 130 may be an Electronic Control Unit (ECU) that controls the travel of the vehicle, and may be any one of a microcomputer, a CPU, and a processor.

Referring to fig. 3, the battery management device 160 may include a temperature detector 161, a voltage detector 162, a management controller 163, a storage device 164, and a communication device 165, and may further include a current detector 166.

The temperature detector 161 (e.g., a temperature sensor, etc.) may detect the temperature of the battery 143 and output temperature information about the detected temperature.

The voltage detector 162 (e.g., a voltage sensor, etc.) may detect the voltage of the battery 143 and output voltage information regarding the detected temperature.

There may be a plurality of voltage detectors 162. The plurality of voltage detectors 162 are connected to output terminals of a plurality of battery cells of the battery 143 to detect voltages of the plurality of battery cells, respectively.

The battery management device 160 may further include a switch connected to the voltage detector 162. The switch may be selectively connected to the plurality of battery cells. The voltage detector 162 may detect voltages of the plurality of battery cells, respectively, and output voltage information regarding the voltage of each detected battery cell in response to a change in the on-contact of the switch.

The battery management apparatus 160 may further include a current detector 166, and the current detector 166 detects the current of the battery 143 and outputs current information about the detected current.

The management controller 163 may obtain the charge state information of the battery 143 based on the detected current information and voltage information of the battery 143 and output the obtained charge state information of the battery 143 to the controller 130.

Here, the charge state information of the battery 143 may be a charge amount of the battery 143 or a charge level of the battery 143.

The management controller 163 may obtain voltage values of the plurality of battery cells, respectively, based on the received voltage information of the plurality of battery cells, identify a maximum voltage value and a minimum voltage value among the obtained voltage values of the plurality of battery cells, obtain a voltage deviation value by subtracting the minimum voltage value from the maximum value, and compare the obtained voltage deviation value with a first reference value.

When it is determined that the obtained voltage deviation value exceeds the first reference value, the management controller 163 may obtain the power limit value based on the first map stored in the storage device 164.

When the power limit value (P) is obtained based on the first map stored in the storage device 164_delta) The management controller 163 may be based on the power limit value (P)_delta) And weights (factors) to obtain the final power limit value.

Final power limit (weight) power limit (P)_delta)

The initial value of the weight may be 1.

When limiting the output of the motor 144 based on the obtained final power limit value, the management controller 163 may again obtain voltage values of the plurality of battery cells based on the received voltage information of the plurality of battery cells, identify a minimum voltage value among the obtained voltage values of the plurality of battery cells, and compare the identified minimum voltage value with a second reference value. As a result of comparing the minimum voltage value with the second reference value, the management controller 163 may determine whether the minimum voltage value is less than the second reference value.

The management controller 163 may update the weight when it is determined that the minimum voltage value is less than the second reference value, and initialize the weight when it is determined that the minimum voltage value is greater than or equal to the second reference value.

Updating the weights may include obtaining the weights based on a weight table stored in the storage 164 and updating the current weights using the obtained weights.

The management controller 163 may update the current weight to obtain the power limit value at a later time.

Initializing the weight may include setting the weight to 1.

When it is determined that the obtained voltage deviation value is less than or equal to the first reference value, the management controller 163 may identify the degradation rate of the battery 143 and compare the identified degradation rate with a reference degradation rate.

The degradation of the battery 143 may include capacity degradation and internal resistance degradation.

The identified degradation rate of the battery 143 may be a degradation rate corresponding to a lifespan of the battery 143. In this case, the storage device 164 may store the deterioration rate corresponding to the lifetime.

The management controller 163 may obtain the degradation rate of the battery 143 based on the temperature and the charging rate of the battery 143.

The management controller 163 may obtain the deterioration rate of the battery 143 based on the capacity reduced compared to the rated capacity of the battery 143.

When it is determined that the degradation rate of the battery 143 exceeds the reference degradation rate, the management controller 163 may obtain the power limit value (P) based on the second map_soh)。

When the power limit value (P) is obtained based on the second map stored in the storage device 164_soh) The management controller 163 may be based on the power limit value (P)_soh) And weights (factors) to obtain the final power limit value.

Final power limit (weight) power limit (P)_soh)

The initial value of the weight may be 1.

When it is determined that the degradation rate of the battery 143 is less than or equal to the reference degradation rate, the management controller 163 may determine that the battery is in the normal state, and obtain the power limit value (P) corresponding to the normal state based on the third map_normal)。

When a power limit value (P) corresponding to a normal state is obtained_normal) While, the pipeThe physical controller 163 may be based on the power limit value (P)_normal) And a weight (factor) corresponding to a normal state to obtain a final power limit value.

Final power limit (weight) power limit (P)_normal)

The initial value of the weight may be 1.

The management controller 163 may limit the output of the motor 144 based on the obtained final power limit value.

The management controller 163 may determine the power limit value based on the voltage deviation between the battery cells and the degradation rate of the battery 143, and the management controller 163 may transmit the power limit value to the controller 130.

The management controller 163 may recognize voltage information regarding the voltage of the battery 143 detected while the EV mode is performed, and determine whether the voltage value of the battery 143 is less than a second reference value based on the recognized voltage information. When it is determined that the voltage value of the battery 143 is less than the second reference value, the management controller 163 may update the weight to prevent the battery from being damaged.

The management controller 163 may identify a minimum voltage value among the voltage values of the plurality of battery cells. When the second reference value is less than the minimum voltage value, the management controller 163 may subtract the minimum voltage value from the second reference value to obtain a subtracted value (difference value). When it is determined that the obtained subtraction value exceeds the third reference value, the management controller 163 may obtain a final weight by subtracting a first predetermined ratio of the set value from the current weight, and update the current weight to the obtained final weight.

When it is determined that the obtained subtraction value is less than or equal to the third reference value, the management controller 163 may obtain a final weight by subtracting a second predetermined ratio of the set value from the current weight, and update the current weight with the obtained final weight.

Here, the ratio of changing the set value may be changed according to the obtained subtraction value.

The management controller 163 may identify an output decrease time of the battery 143 corresponding to the current degradation rate of the battery 143. When the degradation rate of the battery 143 exceeds the reference degradation rate, the management controller 163 may obtain the current output available time of the battery 143 based on the previously stored reference output available time of the battery 143 and the output decrease time of the battery 143, and transmit information on the obtained current output available time of the battery 143 to the controller 130.

The storage device 164 may store information on the output decrease time of the battery 143 and the reference output available time of the battery 143 corresponding to the degradation rate of the battery 143.

The storage device 164 may store information on the first reference value, the second reference value, the third reference value, and the reference degradation rate.

The storage device 164 may store a first map in which power limit values corresponding to voltage differences between maximum and minimum voltage values are matched.

The storage device 164 may store a second map in which power limit values corresponding to the degradation rate of the battery 143 are matched.

The storage device 164 may store a third map in which a power limit value corresponding to a voltage value of the battery 143 is matched when the battery 143 is in a normal state. Here, the voltage value of the battery 143 matched with the third mapping may be any one of an average voltage value, a minimum voltage value, and a maximum voltage value of the plurality of battery cells.

The storage device 164 may store the degradation rate corresponding to the lifetime.

The storage device 164 may store the output decrease time corresponding to the deterioration rate of the battery 143 as a table.

The storage device 164 may store a table in which the charged amount of the battery 143 corresponding to the correlation between the current, the voltage, and the temperature of the battery 143 is matched.

The storage 164 may be a chip-implemented memory separate from the processor described above with respect to the management controller 163, or may be integrated with the processor in a single chip.

The storage device 164 may be implemented with at least one of a non-volatile memory device such as a cache, a read-only memory (ROM), a programmable ROM (prom), an erasable programmable ROM (eprom), an electrically erasable programmable ROM (eeprom), a volatile memory device such as a Random Access Memory (RAM), and a storage medium such as a Hard Disk Drive (HDD) or a Compact Disc (CD) ROM, but is not limited thereto.

The communication device 165 may communicate with the controller 130 and transmit the state information of the battery 143 to the controller 130.

The communication device 165 may include at least one communication module configured to communicate with the controller 130. The communication module may be a hardware device implemented by various electronic circuits (e.g., a processor) to send and receive signals via a wireless or wired connection. For example, the communication device 165 may include at least one of a short-range communication module, a wired communication module, and a wireless communication module.

The short-range communication module may include various short-range communication modules configured to transmit and receive signals using short-range wireless communication modules, such as a bluetooth module, an infrared communication module, a Radio Frequency Identification (RFID) communication module, a Wireless Local Area Network (WLAN) communication module, an NFC communication module, and a ZigBee communication module.

The wired communication module may include various wired communication modules, for example, a Controller Area Network (CAN) module, a Local Area Network (LAN) module, a Wide Area Network (WAN) module, or a Value Added Network (VAN) module, and various wired communication modules, for example, a Universal Serial Bus (USB), a High Definition Multimedia Interface (HDMI), a Digital Video Interface (DVI), a recommendation standard 232(RS-232), a power line communication, or a Plain Old Telephone Service (POTS).

The wireless communication module may include a wireless communication module supporting various wireless communication methods, for example, a Wi-Fi module, a wireless broadband module, Global System for Mobile (GSM) communication, Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Time Division Multiple Access (TDMA), Long Term Evolution (LTE).

Fig. 4 is a control flowchart of a vehicle according to an exemplary embodiment of the invention.

The vehicle can obtain voltage information corresponding to the voltage of the battery cells of the battery 143 detected by the voltage detector 162 provided in the battery management device 160.

The vehicle may obtain voltage values of the plurality of battery cells based on the voltage information of the plurality of battery cells (201), and identify a maximum voltage value and a minimum voltage value among the obtained voltage values of the plurality of battery cells (202).

The vehicle may obtain the voltage deviation value by subtracting the minimum voltage value from the identified maximum voltage value, and compare the obtained voltage deviation value with the first reference value.

When the vehicle determines that the obtained voltage deviation value exceeds the first reference value as a result of comparing the obtained voltage deviation value with the first reference value (203), the vehicle may obtain the power limit value based on the first map stored in the storage device 164 (204).

When the obtained voltage deviation value exceeds the first reference value, this means that the deterioration of the battery 143 has exceeded the reference value. That is, when the obtained voltage deviation value exceeds the first reference value, it means that the battery 143 is in an abnormal state.

When the power limit value (P) is obtained based on the first map stored in the storage device 164_delta) The vehicle may be based on a power limit value (P)_delta) And weights (factors) to obtain the final power limit value.

Final power limit (weight) power limit (P)_delta)

The initial value of the weight may be 1.

The vehicle may control the discharge of the battery 143 based on the obtained final voltage deviation value.

When the obtained voltage deviation value exceeds the first reference value, the vehicle may limit the output of the electric motor 144 based on the obtained final power limit value.

When limiting the output of the motor 144 based on the obtained final power limit value, the vehicle may again obtain voltage values of the plurality of battery cells based on the received voltage information of the plurality of battery cells, identify a minimum voltage value among the obtained voltage values of the plurality of battery cells, and compare the identified minimum voltage value with a second reference value. As a result of comparing the minimum voltage value with the second reference value, the vehicle may determine whether the minimum voltage value is less than the second reference value (205).

The vehicle may update the weight (206) when the minimum voltage value is determined to be less than the second reference value and initialize the weight (207) when the minimum voltage value is determined to be greater than or equal to the second reference value.

Updating the weights may include obtaining the weights based on a weight table stored in the storage 164 and updating the current weights using the obtained weights.

The vehicle may later update the current weight to obtain the power limit value.

Initializing the weight may include setting the weight to 1.

When the vehicle determines that the obtained voltage deviation value is less than the first reference value as a result of comparing the obtained voltage deviation value and the first reference value, the vehicle may identify a degradation rate of the battery 143 and compare the identified degradation rate with a reference degradation rate.

The degradation of the battery 143 may include capacity degradation and internal resistance degradation.

The identified degradation rate of the battery 143 may be a degradation rate corresponding to a lifespan of the battery 143. In this case, the storage device 164 may store the deterioration rate corresponding to the lifetime.

The vehicle may obtain the degradation rate of the battery 143 based on the temperature and the charging rate of the battery 143.

The vehicle can obtain the deterioration rate of the battery 143 based on a capacity reduced compared to the rated capacity of the battery 143.

When the vehicle determines that the deterioration rate of the battery 143 exceeds the reference deterioration rate as a result of comparing the deterioration rate with the reference deterioration rate (208), the vehicle may obtain the power limit value (P) based on the second map stored in the storage device_soh)(209)。

When the vehicle obtains the power limit value (P) based on the second map stored in the storage device 164_soh) The vehicle may be based on a power limit value (P)_soh) And weights (factors) to obtain the final power limit value.

Final power poleLimit value weight power limit value (P)_soh)

The initial value of the weight may be 1.

When the deterioration rate of the battery 143 exceeds the reference deterioration rate, the vehicle may limit the output of the electric motor 144 based on the obtained final power limit value.

As the battery 143 deteriorates, the power limit value that the battery 143 can use also changes.

Thus, the vehicle can obtain the deterioration rate of the battery 143, and use it to obtain the power limit value of the battery 143 based on the obtained deterioration rate.

The output of the battery 143 can maintain the reference output performance even if the battery 143 deteriorates. However, the time for maintaining the reference output performance of the battery 143 may vary.

For example, in the case where the degradation rate of the battery 143 is less than or equal to the reference degradation rate, the output performance of 30kW may be maintained for 10 hours. On the other hand, the battery 143 having a deterioration rate exceeding the reference deterioration rate may maintain the output performance of 30kW for 5 hours.

The vehicle may obtain information on the time for maintaining the reference output performance of the battery 143 based on the degradation rate of the battery 143, and may control the charging and discharging of the battery 143 based on the obtained time information.

When the degradation rate of the battery 143 exceeds the reference degradation rate, the vehicle may obtain the current output available time of the battery 143 based on the reference output available time of the battery 143 and the current degradation rate of the battery 143, and control the traveling of the vehicle and the operation of the electronic devices in the vehicle based on the obtained current output available time of the battery 143.

Current output available time of battery-output reduction time corresponding to deterioration rate

Here, the output reduction time corresponding to the deterioration rate of the battery 143 may be a value obtained through a battery test, and may be stored as a table.

The vehicle may control the discharge of the battery 143 based on the obtained current output available time.

When the vehicle determines that the degradation rate of the battery 143 is less than or equal to the reference degradation rate, the vehicle may determine that the state of the battery is a normal state, and obtain the power limit value (P) corresponding to the normal state based on the third map_normal)(210)。

When the vehicle obtains a power limit value (P) corresponding to a normal state_normal) The vehicle may be based on a power limit value (P) corresponding to a normal state_normal) And weights (factors) to obtain the final power limit value.

Final power limit (weight) power limit (P)_normal)

The initial value of the weight may be 1.

When the battery 143 is in a normal state, the vehicle may limit the output of the motor 144 based on the obtained final power limit value.

Even when the vehicle limits the output of the motor 144 based on the final power limit value corresponding to the deterioration rate of the battery 143 and the final power limit value corresponding to the normal state of the battery 143, the vehicle may recognize the voltage information of the plurality of battery cells again, obtain the voltage values of the plurality of battery cells based on the voltage information of the battery cells again, recognize the minimum voltage value among the obtained voltage values of the plurality of battery cells, and compare the recognized minimum voltage value with the second reference value. As a result of comparing the identified minimum voltage value with the second reference value, the vehicle may determine whether the identified minimum voltage value is less than the second reference value (205).

Next, the vehicle may update the weight when the identified minimum voltage value is determined to be less than the second reference value (206), and initialize the weight when the identified minimum voltage value is determined to be greater than or equal to the second reference value.

When the deterioration rate of the battery 143 is obtained, an error may be included.

Even if the voltage deviation values of the batteries 143 are the same (i.e., the states of the batteries are in a normal state), the voltage values of the same current may be differently detected according to the internal states of the batteries 143.

Therefore, in order to protect the battery 143, the vehicle may update the weight based on the minimum voltage value among the voltage values of the battery cells.

Fig. 5 is a control flowchart of updating weights during vehicle control according to an exemplary embodiment of the present invention.

The vehicle may recognize the voltage information of the plurality of battery cells again, obtain the voltage values of the plurality of battery cells again based on the voltage information of the plurality of battery cells, and recognize a minimum voltage value among the obtained voltage values of the plurality of battery cells. When the second reference value is less than the identified minimum voltage value (211), the vehicle may obtain a subtracted value by subtracting the minimum voltage value from the second reference value.

The reason why the subtraction value is obtained by subtracting the minimum voltage value from the second reference value is to identify how much the minimum voltage value differs from the second reference value.

When the subtraction value obtained by subtracting the minimum voltage value from the second reference value is large, it means that the current power limit value is insufficient, and thus the power limit value must be increased. I.e. the larger the subtraction value, the more the power limit value should be increased.

The vehicle may compare the obtained subtraction value with a third reference value, and when it is determined that the obtained subtraction value exceeds the third reference value as a result of comparing the obtained subtraction value with the third reference value (212), the vehicle may obtain a final weight by subtracting a first predetermined ratio of the setting value a from the current weight, and update the current weight using the obtained final weight (213).

Here, the first predetermined ratio may be a double ratio.

Final weight-current weight (factor) -2 a

As a result of comparing the obtained subtraction value with the third reference value, if the vehicle determines that the obtained subtraction value is less than or equal to the third reference value, the vehicle obtains the final weight by subtracting a second predetermined ratio of the set value (a) from the current weight. The current weight is updated with the obtained final weight (214).

Here, the second predetermined ratio may be a ratio of 1 time.

Final weight (factor) -1 a, current weight

As shown in fig. 6, the power limit value of the battery 143 may be obtained based on the voltage deviation values of the plurality of battery cells and the degradation rate of the battery 143. By supplying power to the power system 140 of the vehicle and the electronic devices of the vehicle based on the obtained power limit value of the battery 143, it can be recognized that the minimum voltage value of the battery cell of the battery 143, which is the minimum available voltage value of the conventional battery, is maintained above 2.5V.

In this way, it is possible to prevent the battery 143 from being excessively discharged at the minimum available voltage value and shorten the service life of the battery.

According to an exemplary embodiment of the present invention, a power limit value of a battery may be obtained in consideration of degradation of the battery, and a usage time of the battery may be adjusted.

According to the exemplary embodiments of the present invention, even if the battery is deteriorated, the electric power can be output in the normal battery voltage use region, and therefore, the vehicle can be stably controlled.

According to an exemplary embodiment of the present invention, it is possible to prevent the deterioration of the battery from being accelerated by preventing the voltage of the battery from exceeding the normal voltage range.

According to an exemplary embodiment of the present invention, it is possible to prevent the battery from being excessively discharged at the available minimum voltage value and to shorten the lifespan of the battery by adjusting the power limit value based on the voltage deviation value and the weight of the plurality of battery cells.

As described above, the present invention can prevent damage of a battery due to a low voltage of the battery, and can improve marketability of a Hybrid Electric Vehicle (HEV) and a plug-in hybrid electric vehicle (PHEV) that can be driven by the battery and a motor, further improve user satisfaction, and ensure product competitiveness.

The disclosed embodiments may be implemented in the form of a recording medium storing computer-executable instructions executable by a processor. The instructions may be stored in the form of program code and when executed by a processor, the instructions may generate program modules to perform the operations of the disclosed embodiments. The recording medium may be non-transitory as a computer-readable recording medium.

The non-transitory computer-readable recording medium may include all kinds of recording media storing commands that can be interpreted by a computer. For example, the non-transitory computer readable recording medium may be, for example, a ROM, a RAM, a magnetic tape, a magnetic disk, a flash memory, an optical data storage device, or the like.

So far, embodiments of the present invention have been described with reference to the drawings. It is obvious to those skilled in the art that the present invention can be embodied in other forms than the embodiments described above without changing the technical idea or essential features of the present invention. The above embodiments are exemplary only, and should not be construed in a limiting sense.