阅读说明：本技术 电池系统 (Battery system ) 是由 崔珍辉 于 2020-05-07 设计创作，主要内容包括：一种电池系统,包括：第一子继电器,其连接到第一节点和第二节点,所述第一节点连接在至少两个电池单体模块之间,所述第二节点在第一输出端与第一主继电器之间；以及第二子继电器,其连接到所述第一节点和第三节点,所述第三节点在第二输出端与第二主继电器之间。当定位在相对于所述第一节点的第一侧的第一电池单体模块的第一电池单体产生故障时,在闭合所述第一主继电器的同时接通所述第一子继电器,并且在发生第一时间延迟之后关断所述第一主继电器,以及当定位在相对于所述第一节点的第二侧的第二电池单体模块的第二电池单体产生故障时,在闭合所述第二主继电器的同时接通所述第二子继电器,并且在发生第二时间延迟之后关断所述第二主继电器。(A battery system, comprising: a first sub-relay connected to a first node connected between at least two battery cell modules and a second node between a first output terminal and a first main relay; and a second sub-relay connected to the first node and a third node between a second output terminal and a second main relay. The first sub-relay is turned on while the first main relay is closed and the first main relay is turned off after a first time delay occurs when a first cell of a first cell module positioned at a first side with respect to the first node generates a fault, and the second sub-relay is turned on while the second main relay is closed and the second main relay is turned off after a second time delay occurs when a second cell of a second cell module positioned at a second side with respect to the first node generates a fault.)

1. A battery system, comprising:

a battery cell assembly including at least two battery cell modules including at least one battery cell;

the first fuse and the first main relay are connected between the first end and the first output end of the single battery pack in series;

a second fuse and a second main relay connected in series between a second end and a second output end of the battery cell assembly;

a first sub-relay connected to a first node connected between the at least two cell modules and a second node between the first output terminal and the first main relay; and

a second sub-relay connected to the first node and a third node between the second output terminal and the second main relay,

wherein, when a first cell of a first cell module positioned at a first side with respect to the first node generates a fault, the first sub-relay is turned on while the first main relay is closed, and the first main relay is turned off after a first time delay occurs, and when a second cell of a second cell module positioned at a second side with respect to the first node generates a fault, the second sub-relay is turned on while the second main relay is closed, and the second main relay is turned off after a second time delay occurs.

2. The battery system of claim 1, wherein

The first fuse is disconnected within the first time delay and the second fuse is disconnected within the second time delay.

3. A battery system, comprising:

a battery cell assembly, the battery cell assembly comprising: two battery cell module groups, wherein the battery cell module groups are configured with a plurality of cells;

the first fuse and the first main relay are connected between the first end and the first output end of the single battery pack in series;

a second fuse and a second main relay connected in series between a second end and a second output end of the battery cell assembly;

a first sub-relay connected to a first node connected between the two cell modules and a second node between the first output terminal and the first main relay;

a second sub-relay connected to the first node and a third node between the second output terminal and the second main relay; and

a battery management system for, when a faulty battery cell is detected from among the at least two battery cell module groups, truncating a first battery cell module group including the faulty battery cell from a corresponding node among the second node and the third node by turning off a main relay corresponding to the first battery cell module group from among the first main relay and the second main relay, and connecting a second battery cell module group and a corresponding node among the two battery cell module groups by turning on a sub-relay corresponding to the second battery cell module group from among the first sub-relay and the second sub-relay.

4. The battery system of claim 3, wherein

The battery management system turns on the corresponding sub-relay while the corresponding main relay is closed, and turns off the corresponding main relay after a predetermined time delay occurs.

5. The battery system of claim 4, wherein

A fuse corresponding to the corresponding main relay among the first fuse and the second fuse is disconnected within the time delay.

6. The battery system of claim 3, wherein

The battery management system includes:

a cell monitoring IC for obtaining status information on each battery cell;

a main control IC for receiving the state information on the respective battery cells to determine the first battery cell module group, and generating a relay driving control signal for controlling driving of the first and second main relays and the first and second sub-relays; and

a relay driver for generating relay driving signals for driving the first and second main relays and the first and second sub-relays according to the relay driving control signals.

7. The battery system of claim 6, wherein

The relay driver changes the second relay driving signal of the corresponding sub-relay to an on level at an on level of the first relay driving signal of the corresponding main relay, and changes the first relay driving signal to an off level after a predetermined time delay occurs.

8. The battery system of claim 3, wherein

When the first battery cell module group is connected between the first node and the first fuse,

the battery management system turns on the first sub-relay while the first main relay is closed, and turns off the first main relay after a predetermined time delay occurs.

9. The battery system of claim 8, wherein

The first fuse is disconnected within the time delay.

10. The battery system of claim 3, wherein

When the first battery cell module group is connected between the first node and the second fuse,

the battery management system turns on the second sub-relay while the second main relay is closed, and turns off the second main relay after a predetermined time delay occurs.

11. The battery system of claim 10, wherein

The second fuse is disconnected within the time delay.

Technical Field

The present disclosure relates to a battery system. In particular, the present disclosure relates to a battery system suitable for an electric vehicle.

Background

In the case of the automatic driving level 4 of the electric vehicle, the electric vehicle operates without driver intervention even in dynamic driving conditions. The autopilot level 4 is one of the autopilot steps of the National Highway Traffic Safety Administration (NHTSA) and represents the level at which the vehicle reaches the destination by itself without driver intervention.

When a fault (e.g., cell overvoltage) is generated in a battery mounted on a conventional electric vehicle, an alarm is generated from the battery, and a relay of the battery is opened after a predetermined time (e.g., ten seconds). Additional overvoltage of the battery can be prevented by opening the relay, and explosion of the battery can be prevented.

However, in the case of the automatic driving level 4, the passenger state in the electric vehicle may be a state in which the vehicle may not be monitored (e.g., a sleep state), and the electric vehicle may need to be operated for longer than a predetermined time (ten seconds) for other reasons. In the case of a battery failure, the relay of the battery is turned off when a predetermined time elapses, and thus an additional emergency battery is provided to prepare for an operation exceeding the predetermined time, which becomes a cause of wasting a space of the electric vehicle, and a reduction in size and capacity of the battery and a reduction in a normal running distance may occur.

Disclosure of Invention

Technical problem

The present invention has been made in an effort to provide a battery system for driving a vehicle when a battery fails.

Technical scheme

An embodiment of the present invention provides a battery system including: a battery cell assembly including at least two battery cell modules including at least one battery cell; the first fuse and the first main relay are connected between the first end and the first output end of the single battery pack in series; the second fuse and the second main relay are connected between the second end and the second output end of the single battery pack in series; a first sub-relay connected to a first node connected between at least two battery cell modules and a second node between a first output terminal and a first main relay; and a second sub-relay connected to the first node and a third node between the second output terminal and the second main relay, wherein, when a first cell of the first cell module positioned at a first side with respect to the first node generates a fault, the first sub-relay is turned on while the first main relay is closed and the first main relay is turned off after a first time delay occurs, and when a second cell of the second cell module positioned at a second side with respect to the first node generates a fault, the second sub-relay is turned on while the second main relay is closed and the second main relay is turned off after a second time delay occurs.

The first fuse may be disconnected within a first time delay and the second fuse may be disconnected within a second time delay.

Another embodiment of the present invention provides a battery system including: the battery monomer assembly comprises two battery monomer module groups, and the battery monomer module groups are configured with a plurality of monomers; the first fuse and the first main relay are connected between the first end and the first output end of the single battery pack in series; the second fuse and the second main relay are connected between the second end and the second output end of the single battery pack in series; a first sub-relay connected to a first node connected between the two battery cell modules and a second node between the first output terminal and the first main relay; a second sub-relay connected to the first node and a third node between the second output terminal and the second main relay; and a battery management system for, when a faulty battery cell is detected from among the at least two battery cell module groups, cutting off a first battery cell module group including the faulty battery cell from a corresponding node among the second and third nodes by turning off a main relay corresponding to the first battery cell module group from among the first and second main relays, and connecting a second battery cell module group and the corresponding node from among the two battery cell module groups by turning on a sub-relay corresponding to the second battery cell module group from among the first and second sub-relays.

The battery management system may turn on the corresponding sub-relay while the corresponding main relay is closed, and may turn off the corresponding main relay after a predetermined time delay occurs.

A fuse corresponding to the corresponding main relay among the first fuse and the second fuse may be disconnected within a time delay.

The battery management system may include: a cell monitoring IC for obtaining status information on each battery cell; a main control IC for receiving state information on the respective battery cells to determine the first battery cell module group, and generating a relay driving control signal for controlling driving of the first and second main relays and the first and second sub-relays; and a relay driver for generating relay driving signals for driving the first and second main relays and the first and second sub-relays according to the relay driving control signals.

The relay driver may change the second relay driving signal of the corresponding sub-relay to an on level at an on level of the first relay driving signal of the corresponding main relay, and may change the first relay driving signal to an off level after a predetermined time delay occurs.

When the first battery cell module group is connected between the first node and the first fuse, the battery management system may turn on the first sub-relay while the first main relay is closed, and may turn off the first main relay after a predetermined time delay occurs.

The first fuse may be disconnected within a time delay.

When the first battery cell module group is connected between the first node and the second fuse, the battery management system may turn on the second sub-relay while the second main relay is closed, and may turn off the second main relay after a predetermined time delay occurs.

The second fuse may be disconnected within a time delay.

Technical effects

According to an embodiment of the present invention, there is provided a battery system for safely driving an electric vehicle when a battery malfunctions.

Drawings

Fig. 1 shows a battery system according to an embodiment.

Fig. 2 illustrates an example of operating one of two battery cell module packs according to an embodiment.

Fig. 3 shows waveforms of the driving signals according to the embodiment described with reference to fig. 2.

Fig. 4 illustrates an example of operating the other of the two battery cell module sets according to an embodiment.

Fig. 5 shows waveforms of driving signals according to the embodiment described with reference to fig. 4.

Detailed Description

The battery system and the battery management method introduced in the present disclosure may intercept a cell region where a failure occurs when the failure occurs in a battery, and operate an electric vehicle by using energy of the remaining cell region. The electric vehicle can obtain sufficient time to move to a safe area by using the energy of the remaining battery cell region.

Hereinafter, exemplary embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings. In this specification, the same or similar components will be denoted by the same or similar reference numerals, and a repetitive description thereof will be omitted. The terms "module" and "unit" for components used in the following description are only for the purpose of making the description easier to understand. Thus, these terms do not have meanings or roles of distinguishing themselves from each other. In describing exemplary embodiments of the present specification, detailed descriptions of well-known technologies associated with the present invention are omitted when it is determined that they may make the gist of the present invention unclear. The accompanying drawings are provided only to allow easy understanding of exemplary embodiments disclosed in the present specification, and should not be construed as limiting the spirit disclosed in the present specification, and it should be understood that the present invention includes all modifications, equivalents, and alternatives without departing from the scope and spirit of the present invention.

Terms including ordinal numbers such as first, second, etc., will be used only to describe various elements, and should not be construed as limiting the elements. These terms are only used to distinguish one element from another.

It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or be connected or coupled to the other element with other elements interposed therebetween. On the other hand, it is to be understood that when an element is referred to as being "directly connected or coupled" to another element, it can be connected or coupled to the other element without other elements interposed therebetween.

It will be further understood that the terms "comprises" and "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, components, or groups thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or groups thereof.

Fig. 1 shows a battery system according to an embodiment.

As shown in fig. 1, a battery system 1 includes a battery cell assembly 2, a Battery Management System (BMS)3, two main relays 10 and 15, two fuses 11 and 16, and two sub-relays 30 and 35.

The battery system shown in fig. 1 is connected to a motor of an electric vehicle and supplies electric power to drive the motor.

The battery cell assembly 2 may be configured by connecting a plurality of battery cell modules in series/parallel, and it may supply electric power to a load, such as an electric motor of a vehicle. As shown in fig. 1, the battery cell assembly 2 includes four battery cell modules 21 to 24 connected in series, and each of the battery cell modules 21 to 24 includes four battery cells (CE1 to CE4) connected in series, respectively. This is an example for describing the embodiments, and is not limited thereto. The number of the plurality of battery cell modules and the number of the battery cells in the battery cell modules may be modified according to design, the battery cell assembly may include at least two battery cell modules, the battery cell modules may include at least one cell, the connection of the plurality of battery cell modules is not limited to a series connection, and the connection may be a series connection, a parallel connection, or a series/parallel connection according to a required power supply voltage.

The first fuse 11 and the first main relay 10 are connected in series between the output terminal (OUT +) of the battery system 1 and the positive electrode of the battery cell assembly 2, and the second fuse 16 and the second main relay 15 are connected in series between the output terminal (OUT-) of the battery system 1 and the negative electrode of the battery cell assembly 2.

In the battery cell assembly 2, the first sub-relay 30 is connected between a Node (NM) where the two battery cell modules 21 and 22 and the two battery cell modules 23 and 24 are connected to each other and the output terminal (OUT +), and the second sub-relay 35 is connected between the Node (NM) and the output terminal (OUT-).

The first main relay 10, the second main relay 15, the first sub relay 30, and the second sub relay 35 may be switched according to relay driving signals (PR1, PR2, SR1, and SR2) applied by the BMS 3. Although not shown in fig. 1, a wire for transmitting the driving signal to the corresponding relay may be formed.

The BMS3 includes a cell monitoring IC 31, a main control IC 32, and a relay driver.

The cell monitoring IC 31 may be electrically connected to a plurality of battery cells (CE1 to CE4) constituting the battery cell modules 21 to 24, may sense information on the battery cells, and may transmit the sensed information to the main control IC 32. The information on the battery cell may include a voltage and a temperature of the battery cell. Although not shown in fig. 1, a current value measured by a sensor for sensing a current flowing through the battery cell assembly 2 may be transmitted to the cell monitoring IC 31. The cell monitoring IC 31 may transmit information about the current flowing through the battery cell assembly 2 to the main control IC 32.

The BMS3 may analyze the information about the battery cells transmitted from the cell monitoring IC 31 and may detect a malfunctioning cell from among the plurality of battery cells (CE1 to CE4) of the plurality of corresponding battery cell modules 21 to 24. The voltage at the failing cell may be greater than a predetermined threshold voltage. The BMS3 drives the battery cell module groups except for the battery cell module group including the failed cell.

The main control IC 32 may generate a relay driving control signal (RDS) based on a location of a battery cell from which a fault is sensed, and may transmit the same to the relay driver 33.

The relay driver 33 may generate four relay driving signals (PR1, PR2, SR1, and SR2) according to the relay driving control signal (RDS).

A detailed method for driving the battery cell module in the case of the generation of the failed battery cell will now be described with reference to fig. 2 to 5.

When a defective battery cell is generated from among a plurality of battery cells in the conventional battery system, the battery is used to maintain the running of the vehicle for a predetermined time. However, in the case of automatic driving, the driver may not be able to drive the vehicle to a safe place within a predetermined time. In the embodiment, unlike a temporary reaction method for managing the entire battery within a predetermined time, electric power is supplied to the vehicle by using a battery cell module group that does not include a faulty cell.

The plurality of battery cell modules may be divided into at least two battery cell module groups. Referring to fig. 1, two battery cell modules 21 and 22 form one battery cell module group, and two battery cell modules 23 and 24 form another battery cell module group. In fig. 1, the battery cell assembly 2 is divided into two battery cell module groups 200 and 210, but the present invention is not limited thereto, and may be divided into two or more battery cell module groups by considering the number of a plurality of battery cell modules.

When the relay changes from the open (exposed) state to the closed (closed) state, it is referred to as "On", and when the relay changes from the closed state to the open state, it is referred to as "Off". Turning on and off will be referred to as switching.

The BMS3 controls the switching operations of the first main relay 10, the second main relay 15, the first sub-relay 30, and the second sub-relay 35 according to the state of the faulty battery cell to intercept a battery cell module group including the faulty battery cell (hereinafter, referred to as a faulty battery cell module group) from a load and supply power to the load through a battery cell module group not including the faulty battery cell (hereinafter, referred to as a normal battery cell module group). Then, electric power is supplied from the normal battery cell module group to the electric vehicle, and sufficient time is available to move to a safe place in the autonomous driving mode.

The BMS3 may generate driving signals (PR1, PR2, SR1, and SR2) for the respective relays in order to control switching operations of the first main relay 10, the second main relay 15, the first sub-relay 30, and the second sub-relay 35.

Fig. 2 illustrates an example of operating one of two battery cell module packs according to an embodiment.

Fig. 3 shows waveforms of the driving signals according to the embodiment described with reference to fig. 2.

It will be assumed in fig. 2 that the cell CE3 of the cell module 23 has failed. The BMS3 may stop the operation of the battery cell module stack 210 including the battery cell modules 23 and may control the battery system 1 to supply power to the motor using the battery cell module stack 200.

The main control IC 32 may sense a failure of the cell CE3 of the cell module 23, may turn on the first sub-relay 30 so as to intercept the failed cell module group, and may generate a relay driving control signal (RDS) for turning off the first main relay 10. The above corresponds to when one of the four battery cells (CE1 to CE4) of the two battery cell modules 21 and 22 malfunctions.

There is a predetermined time delay between the on time of the first sub-relay 30 and the off time of the first main relay 10.

Referring to fig. 3, at time T1, the relay driver 33 changes the relay drive signal SR1 from the off level (L) to the on level (H), and after a predetermined delay time TD1 elapses, it changes the relay drive signal PR1 from the on level (H) to the off level (L). During the delay time TD1, a closed loop is formed between the cell module 21, the cell module 22, the first sub-relay 30, and the first main relay 10, an excessive current flows, the fuse 11 is disconnected (disconnected), and the loop is opened. Since no current flows through the first main relay 10, a stuck closed phenomenon (stuck closed phenomenon) is not generated when the first main relay 10 is turned off. The delay time TD1 may be set by adding a predetermined margin to the time when the fuse 11 is disconnected by the current flowing to the closed loop. For the described safety relay switching, the embodiment comprises two fuses 11 and 16.

When the fuse 11 is not provided, the first sub-relay 30 is turned on and the first main relay 10 is turned off, so theoretically an infinite current flows to the corresponding closed loop, and the first main relay 10 is not opened by the latching but remains closed. The current continuously flows to the corresponding closed loops, and thus the battery cells of the two battery cell modules 21 and 22 may generate heat and may deteriorate, and a fire may be caused due to the generation of heat. In order to solve the above-described problem, when the first main relay 10 is turned off and the first sub-relay 30 is turned on, the entire current transmitted to the motor is intercepted at the time of turning off the first main relay 10, and the electric vehicle may suddenly stop.

In view of the above point, the method for driving a relay according to the embodiment includes turning on the first sub-relay 30 while closing the first main relay 10, and turning off the first main relay 10 when the closed loop is disconnected by setting the fuse 11 and current does not flow to the first main relay 10.

While the first main relay 10 and the first sub-relay 30 are switched, as shown in fig. 3, the relay drive signal PR2 is maintained at the on level (H), the relay drive signal SR2 is maintained at the off level (L), the second main relay 15 is closed, and the second sub-relay 35 is opened. Then, as shown in fig. 2, electric power is supplied to the motor from the normal battery cell module group 210 along a current path PA 1.

Fig. 4 illustrates an example of operating the other of the two battery cell module sets according to an embodiment.

Fig. 5 shows waveforms of driving signals according to the embodiment described with reference to fig. 4.

It will be assumed in fig. 4 that the cell CE2 of the cell module 22 has failed. The BMS3 may stop the operation of the battery cell module string 200 including the battery cell module 22, and may control the battery system 1 to supply electric power to the motor using the battery cell module string 210.

The main control IC 32 may sense a failure of the cell CE2 of the cell module 22, may turn on the second sub-relay 35 to intercept the failed cell module group, and may generate a relay driving control signal (RDS) for turning off the second main relay 15. The above-described situation corresponds to when one of the four battery cells (CE1 to CE4) of the two battery cell modules 23 and 24 malfunctions.

For the same reasons given in the description provided with reference to fig. 2 and 3, there is a predetermined time delay TD2 between the on time of the second sub-relay 35 and the off time of the second main relay 15. The time delay TD2 may be different from the time delay TD 1.

Referring to fig. 5, at time T3, the relay driver 33 changes the relay drive signal SR2 from the off level (L) to the on level (H), and after a predetermined delay time TD2 elapses, changes the relay drive signal PR2 from the on level (H) to the off level (L). For the delay time TD2, a closed loop is formed between the cell module 23, the cell module 24, the second sub-relay 35, and the second main relay 15, and an excessive current flows, so the fuse 16 is disconnected and the loop is opened. No current flows to the second main relay 15, and thus no seizure phenomenon occurs when the second main relay 15 is turned off. The delay time TD2 may be set by adding a predetermined margin to the time when the fuse 1 is disconnected 6 by the current flowing to the closed loop.

When the first main relay 10 and the first sub-relay 30 are switched, as shown in fig. 5, the relay driving signal PR2 may be maintained at the on level (H), and the relay driving signal SR2 may be maintained at the off level (L), the second main relay 15 is closed, and the second sub-relay 35 is opened. As shown in fig. 4, electric power is supplied to the motor from the normal battery cell module group 200 along a current path PA 2.

While the invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.