阅读说明：本技术 控制起动电池充电的方法和电池管理器、电动车辆和介质 (Method of controlling starting battery charging, battery manager, electric vehicle, and medium ) 是由 刘建国 高亮亮 毛涛月 黄建 陈明文 于 2019-09-29 设计创作，主要内容包括：本发明公开了一种控制起动电池充电的方法、电池管理器及电动车辆及存储介质,其中,该方法包括：检测到车辆进入起动电池充电模式；获取所述起动电池的初始电压值和DC输出下限电压值；当所述初始电压值大于等于所述DC输出下限电压值时,控制DC/DC装置输出第一电压值,以对所述起动电池充电,其中,所述第一电压值大于所述初始电压值；以及,每隔预设时间增大所述DC/DC装置输出的电压值,且增大幅度为预设电压幅值。本发明的方法、电池管理器和车辆,以动态充电电压对起动电池充电,可以避免低温充电出现析锂现象,提高稳定性,并兼顾充电效率。(The invention discloses a method for controlling charging of a starting battery, a battery manager, an electric vehicle and a storage medium, wherein the method comprises the following steps: detecting that the vehicle enters a starting battery charging mode; acquiring an initial voltage value and a DC output lower limit voltage value of the starting battery; when the initial voltage value is greater than or equal to the DC output lower limit voltage value, controlling a DC/DC device to output a first voltage value to charge the starting battery, wherein the first voltage value is greater than the initial voltage value; and increasing the voltage value output by the DC/DC device at preset time intervals, wherein the increasing amplitude is a preset voltage amplitude value. According to the method, the battery manager and the vehicle, the starting battery is charged by the dynamic charging voltage, the phenomenon of lithium separation in low-temperature charging can be avoided, the stability is improved, and the charging efficiency is considered.)

1. A method of controlling starting battery charging, comprising:

detecting that the vehicle enters a starting battery charging mode;

acquiring an initial voltage value and a DC output lower limit voltage value of the starting battery;

when the initial voltage value is greater than or equal to the DC output lower limit voltage value, controlling a DC/DC device to output a first voltage value to charge the starting battery, wherein the first voltage value is greater than the initial voltage value; and

and increasing the voltage value output by the DC/DC device at preset time intervals, wherein the increasing amplitude is a preset voltage amplitude value.

2. The method of controlling starting battery charging according to claim 1, further comprising:

acquiring a current voltage value and a DC output upper limit voltage value of the starting battery;

judging whether the current voltage value of the starting battery exceeds the DC output upper limit voltage value or not;

and if so, controlling the DC/DC device to output the DC output upper limit voltage value.

3. The method of controlling starting battery charging according to claim 1, further comprising:

and when the initial voltage value is smaller than the DC output lower limit voltage value, controlling the DC/DC device to output the DC output lower limit voltage value.

4. The method of controlling starting battery charging according to any one of claims 1-3, further comprising:

recording the accumulated charging time of the starting battery;

and when the charging accumulated time reaches a preset charging time threshold value, controlling the DC/DC device to stop outputting.

5. The method of claim 1, wherein the predetermined time is adjusted based on a charging current allowed by the starting battery.

6. The method of controlling starting battery charging of claim 1 wherein said starting battery comprises a ferroelectric battery.

7. The method of controlling starting battery charging according to claim 1, further comprising:

detecting a current value of the starting battery;

and when the current value is smaller than a preset current value, triggering the starting battery charging mode.

8. A non-transitory computer storage medium having stored thereon a computer program that, when executed, implements a method of controlling starting battery charging as claimed in any one of claims 1-7.

9. A battery manager, comprising:

a memory;

at least one processor in communication with the memory;

wherein the memory has stored therein computer instructions for execution by the processor, which when executed by the processor, carry out the method of controlling starting battery charging according to any one of claims 1-7.

10. An electric vehicle, characterized by comprising:

a power battery, a DC/DC device, a starting battery, and the battery manager of claim 9, the DC/DC device being connected with the power battery and the starting battery, respectively.

Technical Field

The present invention relates to the field of vehicle technology, and more particularly, to a method of controlling starting battery charging, and a battery manager and an electric vehicle, non-transitory computer storage medium.

Background

A12V low-voltage power supply system is formed by lead-acid batteries commonly used for starting batteries of passenger vehicles, the charging power is mainly determined by the output of a generator and a DC/DC device, and the conventional intelligent charging strategy generally adopts single constant-voltage charging.

The single constant voltage charging method has some disadvantages, for example, the charging current is often very large at the initial stage, and the charging efficiency is very poor at the end stage of charging. Particularly, the current is extremely large at low temperature, and the negative electrode has the risk of lithium precipitation; and the battery life is also affected due to the high temperature rise of the battery caused by the large charging current.

Disclosure of Invention

The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a method for controlling the charging of a starting battery, which can avoid the occurrence of lithium precipitation at the negative electrode during the low-temperature charging of the starting battery, reduce the aging rate of the battery, and take into account the charging efficiency.

A second object of the invention is to propose a non-transitory computer storage medium storing said method.

A third object of the present invention is to provide a battery manager.

A fourth object of the present invention is to provide an electric vehicle.

In order to achieve the above object, a method for controlling charging of a starting battery according to an embodiment of a first aspect of the present invention includes: detecting that the vehicle enters a starting battery charging mode; acquiring an initial voltage value and a DC output lower limit voltage value of the starting battery; when the initial voltage value is greater than or equal to the DC output lower limit voltage value, controlling a DC/DC device to output a first voltage value to charge the starting battery, wherein the first voltage value is greater than the initial voltage value; and increasing the voltage value output by the DC/DC device at preset time intervals, wherein the increasing amplitude is a preset voltage amplitude value.

According to the method for controlling the charging of the starting battery, the voltage value output by the DC/DC device is increased at preset time intervals, namely the voltage value output by the DC/DC device is not constant and is increased along with the rising of the voltage of the starting battery, so that the problem that the heat generation of the battery is high due to the fact that the initial charging current is too large is avoided, the aging speed of the battery can be reduced, particularly, the problem that the lithium is separated out from the negative electrode due to the fact that the initial charging voltage is too high during low-temperature charging is avoided, and the charging stability is improved.

In some embodiments, the method further comprises: acquiring a current voltage value and a DC output upper limit voltage value of the starting battery; judging whether the current voltage value of the starting battery exceeds the DC output upper limit voltage value or not; and if so, controlling the DC/DC device to output the DC output upper limit voltage value.

In some embodiments, the method further comprises: and when the initial voltage value is smaller than the DC output lower limit voltage value, controlling the DC/DC device to output the DC output lower limit voltage value.

In some embodiments, the method further comprises: recording the accumulated charging time of the starting battery; and when the charging accumulated time reaches a preset charging time threshold value, controlling the DC/DC device to stop outputting.

In some embodiments, the preset time is adjusted according to a charging current allowed by the starting battery.

In some embodiments, the starting battery comprises a ferroelectric battery.

In some embodiments, the method further comprises: detecting a current value of the starting battery; and when the current value is smaller than a preset current value, triggering the starting battery charging mode.

A non-transitory computer storage medium storing thereon a computer program that, when executed, implements the method of controlling starting battery charging as described herein is an embodiment of the second aspect of the invention.

A battery manager in accordance with an embodiment of the third aspect of the present invention includes: a memory; at least one processor in communication with the memory; the storage is stored with computer instructions executed by the processor, and the processor implements the method for controlling the charging of the starting battery when executing the computer instructions.

According to the battery manager provided by the embodiment of the invention, the method for controlling the starting motor to charge is executed by the processor, so that the lithium separation phenomenon during low-temperature charging of the starting battery can be avoided, the charging temperature rise is reduced, the service life of the battery is ensured, and the charging efficiency is considered.

An electric vehicle according to a fourth aspect of the present invention includes a power battery, a DC/DC device, a starting battery, and the battery manager, the DC/DC device being connected to the power battery and the starting battery, respectively.

According to the electric vehicle provided by the embodiment of the invention, the battery manager executes the method for controlling the starting motor to charge, so that the lithium separation phenomenon during low-temperature charging of the starting battery can be avoided, the charging temperature rise is reduced, the service life of the battery is ensured, and the charging efficiency is considered.

Additional aspects and advantages 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.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a circuit diagram of an intelligent charging system according to one embodiment of the present invention;

fig. 2 is a block diagram of an intelligent charging system according to one embodiment of the invention;

FIG. 3 is a flow diagram of a method of controlling starting battery charging according to one embodiment of the invention;

FIG. 4 is a flow chart of a method of controlling starting battery charging according to another embodiment of the present invention;

fig. 5 is a flow chart of a method of controlling the charging of a starter battery according to one embodiment of the invention;

FIG. 6 is a graph of the value of the output voltage of the DC/DC device when using the method of an embodiment of the invention versus the value of the output voltage of the DC/DC device when charging with a constant voltage, in accordance with an embodiment of the invention;

FIG. 7 is a block diagram of a battery manager according to one embodiment of the invention;

fig. 8 is a block diagram of an electric vehicle according to an embodiment of the invention.

Detailed Description

Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.

The method for controlling the charging of the starting battery of the embodiment of the invention optimizes the output voltage of the DC/DC device in intelligent charging so as to avoid the problems of lithium precipitation of a low-temperature negative electrode and attenuation of high-temperature charging efficiency when the starting battery is charged.

Fig. 1 is a circuit diagram of an intelligent charging system according to an embodiment of the present invention, and fig. 2 is a functional block diagram of the intelligent charging system according to an embodiment of the present invention.

As shown in fig. 1 and 2, in which a starting battery 10 is a power supply source for a vehicle low-voltage load 60. The DC/DC device 20 is connected to the power battery 30, the generator (BSG)40, and the starting battery 10, respectively, and can reduce the voltage of the high voltage into the low voltage, stabilize the voltage, and output the voltage, thereby charging the starting battery 10. The generator 40 generates electricity through the engine 50 to supply electricity to the low-voltage load and meet the charging demand of the starting battery 10. The low voltage load 60 represents all low voltage electrical appliances using 12V power on the vehicle. The battery manager 70 controls the relay switch and the switching of the MOS transistor. The starter 80 is an electric motor having a function of starting the engine. A BCM (body control Module) 90 is responsible for the power distribution of all the low voltage loads 60.

A method of controlling the charging of the starting battery according to an embodiment of the present invention is described below with reference to fig. 3 to 6.

Fig. 3 is a flowchart of a method for controlling charging of a starting battery according to an embodiment of the present invention, and as shown in fig. 3, the method for controlling charging of a starting battery according to an embodiment of the present invention at least includes steps S1-S4, which are described as follows.

S1, it is detected that the vehicle enters a start battery charging mode.

Specifically, the battery manager can detect the current value of the starting battery in real time, and when the current value is smaller than a preset current value, the starting battery charging mode is triggered, namely, the intelligent charging strategy is triggered when the current of the starting battery is insufficient.

S2, an initial voltage value of the starting battery and a DC output lower limit voltage value are acquired.

Specifically, the intelligent charging strategy is started when the current of the starting battery is insufficient, the current of the starting battery is considered to be small at the moment, the situation is close to the situation that no current passes through, the initial voltage of the starting battery is relatively close to the open-circuit voltage, and the open-circuit voltage of the starting battery is obtained. And, the lower limit value and the upper limit value of the output voltage value of the DC/DC device can be set to take account of the charging efficiency, for example, for a ferroelectric battery, the charging voltage range can be 13.2V-13.8V.

And S3, when the initial voltage value is larger than or equal to the DC output lower limit voltage value, controlling the DC/DC device to output the first voltage value so as to charge the starting battery.

The first voltage value is larger than the DC output lower limit voltage value and smaller than the DC output upper limit voltage value.

Specifically, when the initial voltage value is greater than or equal to the DC output lower limit voltage value, the DC/DC device is controlled to output a voltage value greater than the DC output lower limit voltage value, so that the charging efficiency can be considered.

For example, the DC output lower limit voltage value is a and the DC output upper limit voltage value is B. And the DC/DC device is started, the initial voltage value of the starting battery is confirmed to be U0, for example, the open-circuit voltage is U0, if U0 is more than or equal to A, the output voltage U of the DC/DC device is controlled to be U0+ a, wherein the value a is the increment of the DC charging voltage, and the value a is determined by the battery charging capacity and the output precision of the DC/DC device.

And S4, increasing the voltage value output by the DC/DC device every preset time, wherein the increasing amplitude is a preset voltage amplitude.

For example, every t minutes of charging, the charging voltage rises by the value of a. Along with the charging, the voltage of the starting battery is gradually increased, namely the output voltage value of the DC/DC device is adjusted in real time along with the change of the voltage of the starting battery, so that the charging efficiency can be considered, and the charging efficiency is ensured.

In some embodiments, the preset time t and the charging rate may be adjusted according to a charging current allowed by the starting battery, and the value of t at each voltage may be determined by a charging capability of the battery, which may also take charging efficiency into consideration.

According to the method for controlling the charging of the starting battery, the voltage value output by the DC/DC device is increased at preset time intervals, namely the voltage value output by the DC/DC device is not constant and is increased along with the rising of the voltage of the starting battery, so that the problems that the heat generation of the battery is high due to the fact that the initial charging current is too large and the aging speed of the battery is reduced are avoided, particularly during low-temperature charging, the problem that lithium is separated out from a negative electrode due to the fact that the initial charging voltage is too high can be avoided, the charging stability is improved, and the charging efficiency is considered.

Further, during the charging process, the charging voltage is prevented from exceeding the upper limit voltage value of the DC output, so that the problem of overcharge is avoided. Specifically, a current voltage value of the starting battery is detected; judging whether the current voltage value of the starting battery exceeds the DC output upper limit voltage value or not; if yes, the DC/DC device is controlled to output a DC output upper limit voltage value. For example, during charging, it is continuously determined whether the DC/DC device output voltage exceeds the DC upper limit voltage value B: if the voltage does not exceed the preset value, the output voltage of the DC/DC device rises according to the increment of the value a; if the voltage exceeds the preset value, the charging control is carried out according to the value B. Not only can avoid overcharging, but also can ensure charging efficiency

In some embodiments, the DC/DC device is controlled to output the DC output lower limit voltage value when the initial voltage value is less than the DC output lower limit voltage value. For example, if U0< a, the output voltage value of the DC/DC device is controlled to be a, thereby avoiding excessive current in the initial charging stage and simultaneously achieving charging efficiency.

And recording the accumulated charging time of the starting battery as the voltage of the starting battery is higher and higher along with the charging, and controlling the DC/DC device to stop outputting when the accumulated charging time reaches a preset charging time threshold value and the charging is considered to be finished. The charging accumulated time can be determined by the charging capacity of the battery and the DC output together so as to ensure that the voltage of the starting battery meets the requirement.

Fig. 4 is a flowchart of a method for controlling the charging of the starting battery according to an embodiment of the present invention, as shown in fig. 4, which specifically includes the following steps.

And S100, triggering an intelligent charging strategy.

S101, the DC/DC device is ready to be started.

S102, whether the starting battery U0 is smaller than A is confirmed, if yes, step S103 is executed, otherwise, step S104 is executed.

In step S103, the DC/DC device output voltage U is controlled to be a, and the process proceeds to step S105.

In S104, the DC/DC device output voltage U becomes U0+ a, and the process proceeds to step S105.

S105, 1 minute later, U ═ U + a.

S106, judging whether U0 is smaller than B, if not, returning to step S105, and if yes, entering step S107.

And S107, the output voltage value of the DC/DC device is B.

And S108, when the charging accumulated time reaches a preset charging time threshold, finishing the intelligent charging control.

Taking the iron battery as an example, the output voltage range of the DC/DC device is required to be between 13.2V and 13.8V in the intelligent charging of the iron battery, if the voltage of the starting iron battery is lower than 13.2V, the output voltage of the DC/DC device is 13.2V, if the voltage of the starting iron battery is higher than 13.2V, the output voltage of the DC/DC device is higher than the voltage of the battery by 0.3V, the output voltage of the DC/DC device is increased by 0.1V after 10min, so that the output voltage value of the DC/DC device is repeatedly adjusted, and is not increased until the output voltage of the DC/DC device reaches 13.8V, the intelligent charging is continuously performed, and the intelligent charging is finished after 1.5h of accumulation.

Fig. 5 is a flowchart of a charging control process of the starter battery according to an embodiment of the present invention, as shown in fig. 5, which specifically includes the following steps.

And S200, triggering an intelligent charging strategy.

S201, the DC/DC device is ready to be started.

S202, whether the starting battery U0 is smaller than 13.2V or not is confirmed, if yes, step S203 is executed, and if not, step S204 is executed.

In step S203, the DC/DC device output voltage U is controlled to 13.2V, and the process proceeds to step S205.

In S204, the DC/DC device output voltage U becomes U0+0.1V, and the process proceeds to step S205.

S205, after 1 minute, U ═ U + 0.1V.

S206, judging whether U0 is less than 13.8V, if not, returning to step S205, if yes, entering step S207.

And S207, the output voltage value of the DC/DC device is 13.8V.

And S208, when the charging accumulated time reaches 1.5 hours, the intelligent charging control is finished.

Fig. 6 is a graph of the output voltage variation of the DC/DC device in the smart charge with the single constant voltage charge in this example. Wherein, P1 is the output voltage value change curve of the DC/DC device, and P2 is the voltage change curve adopting constant voltage charging. The voltage output of the DC/DC device in the control strategy is fundamentally different from the traditional voltage output, the voltage rises along with the rise of the SOC of the starting battery, the current value is stable, the battery heating in the charging process can be effectively reduced, and the aging rate of the starting battery is reduced.

Based on the method of controlling the charging of the starting battery of the above embodiment, a non-transitory computer storage medium of an embodiment of the second aspect of the present invention, on which a computer program is stored, which when executed, may implement the method of controlling the charging of the starting battery of the above embodiment.

Fig. 7 is a block diagram of a battery manager according to an embodiment of the present invention, and as shown in fig. 7, the battery manager 70 includes at least a memory 71 and at least one processor 72, and of course, the battery manager 70 may further include components such as a relay and a MOS transistor shown in fig. 1.

Wherein the processor 72 is in communication with the memory 71, and the memory 71 stores therein computer instructions to be executed by the processor 72, and the processor 72 executes the computer instructions to implement the method of controlling the start of battery charging of the above embodiment.

According to the battery manager 70 of the embodiment of the invention, the processor 72 executes the method for controlling the charging of the starting motor of the above embodiment, so that the lithium separation phenomenon during the low-temperature charging of the starting battery can be avoided, the charging temperature rise is reduced, the service life of the battery is ensured, and the charging efficiency is considered.

As shown in fig. 8, the electric vehicle 100 according to the embodiment of the present invention includes a power battery 30, a DC/DC device 20, a starting battery 10, and the battery manager 70 according to the above embodiment, wherein the DC/DC device 20 is connected to the power battery 30 and the starting battery 10, respectively, and of course, the electric vehicle 100 may further include devices and apparatuses as shown in fig. 2, which are not listed here. The battery manager 70 may execute the method for controlling the charging of the starting battery 10 according to the above embodiment, and the specific implementation process may refer to the description of the above embodiment.

According to the electric vehicle 100 of the embodiment of the invention, the battery manager 70 executes the method for controlling the charging of the starting motor of the above embodiment, so that the lithium separation phenomenon during the low-temperature charging of the starting battery can be avoided, the charging temperature rise is reduced, the service life of the battery is ensured, and the charging efficiency is considered.

It should be noted that in the description of the present specification, reference to the description of the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

In the description of the present specification, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.

The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.

It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.

It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.

While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.