CN113581012A

CN113581012A - Low-temperature protection method, device, equipment and storage medium for power battery

Info

Publication number: CN113581012A
Application number: CN202111016535.4A
Authority: CN
Inventors: 李梦妮; 李春东; 王华武; 龚静怡; 张毅; 胡克非
Original assignee: Dongfeng Commercial Vehicle Co Ltd
Current assignee: Dongfeng Commercial Vehicle Co Ltd
Priority date: 2021-08-31
Filing date: 2021-08-31
Publication date: 2021-11-02
Anticipated expiration: 2041-08-31
Also published as: CN113581012B

Abstract

The application discloses a low-temperature protection method, a low-temperature protection device, low-temperature protection equipment and a storage medium of a power battery, wherein the method comprises the steps of judging whether the ambient temperature is lower than a first preset temperature or not after an ignition lock is turned off; if the ambient temperature is lower than the first preset temperature, controlling the fuel cell system to continue to charge the power battery; further judging whether the SOC value of the power battery is lower than a preset SOC value or not; and if the SOC value of the power battery is lower than the preset SOC value, controlling the fuel cell system to continuously charge the power battery until the SOC value is not less than the preset SOC value. The hybrid electric vehicle has the advantages that the hybrid electric vehicle is ensured to be charged with enough electric quantity before being charged in a low-temperature environment, and the power battery can still normally supply power for the driving system after the vehicle is stored at a low temperature for a long time and when the vehicle is started again.

Description

Low-temperature protection method, device, equipment and storage medium for power battery

Technical Field

The application relates to the technical field of new energy vehicles, in particular to a low-temperature protection method and device for a power battery, computer equipment and a computer readable storage medium.

Background

Fuel cell electric vehicles are classified into pure fuel cell electric vehicles and fuel cell hybrid electric vehicles, and the fuel cell hybrid electric vehicles are classified into fuel cell electric vehicles driven by a fuel cell in combination with an auxiliary power cell, fuel cell electric vehicles driven by a fuel cell in combination with a supercapacitor, and fuel cell electric vehicles driven by a fuel cell in combination with an auxiliary power cell and a supercapacitor.

The fuel cell electric automobile driven by the fuel cell and the auxiliary power cell jointly provides energy for the driving motor by the fuel cell and the power cell, and the driving motor converts electric energy into mechanical energy and transmits the mechanical energy to the speed reducing mechanism to drive the automobile to run. The power battery is also often used as an energy storage power source of a fuel cell electric vehicle, and excess electric energy (excluding the load and power consumption of the whole vehicle) converted from fuel is stored in the form of chemical energy. The appropriate charging temperature of the power battery is 10-30 ℃, the battery capacity is remarkably reduced at the excessively low temperature, the charging and discharging capacity and efficiency are seriously reduced, and the charging also has adverse effect on the service life of the battery, so that how to better realize the low-temperature protection of the power battery on the premise of realizing the matched use of the fuel battery and the power battery is the subject of research in the field.

Chinese invention patent CN109818109A discloses a low-temperature protection system for power battery and a protection method thereof, wherein the low-temperature protection system includes a temperature monitoring circuit, a control module and a heating module in addition to the power battery. Firstly, the control module monitors a wake-up signal output by the temperature monitoring circuit 101, and sends a heating instruction to the heating module 103 to control the heating module 103 to heat after acquiring the wake-up signal; sending a sleep or disconnection instruction to the temperature monitoring circuit after receiving the heating module wake-up signal, and controlling the temperature monitoring circuit to enter a sleep or disconnection state; after the heating module finishes heating, the control module lights up to the temperature monitoring and sends out a wake-up instruction, so that the temperature monitoring circuit enters a monitoring state again. In the method, the heating module can heat the power battery at irregular time, so that the temperature of the battery is always in a proper working interval, the battery can be directly charged and discharged, the charging time of the battery is shortened, and the power output capability of the battery is improved, but the defects are obvious. From the above description of the scheme, it can be seen that the control module is always in the wake-up state to monitor the wake-up state of the temperature monitoring circuit, and the temperature monitoring circuit is also in the wake-up state for a long time except for the heating module heating stage recovering from the sleep state. In cold regions, the temperature is low in winter, the working time and frequency of the heating module are correspondingly increased, and particularly under the condition that the vehicle is parked for a long time, the electric quantity of the power battery cannot maintain the long-term awakening of the control module and the temperature monitoring circuit at all, and the frequent working and even normal power-on running of the heating module cannot be met.

Disclosure of Invention

The application mainly aims to provide a low-temperature protection method and device for a power battery, computer equipment and a computer readable storage medium, and aims to solve the problem that the power battery cannot normally supply power to a driving system after a vehicle is stored at a low temperature for a long time and when the vehicle is started.

In a first aspect, the present application provides a method for low-temperature protection of a power battery, including:

after the ignition lock is turned off, judging whether the ambient temperature is lower than a first preset temperature;

and if the ambient temperature is lower than the first preset temperature, controlling the fuel cell system to continuously charge the power battery.

By adopting the technical scheme, the power battery is charged when the low temperature is detected after the ignition lock is turned off so as to cope with the influence of the low-temperature environment on the power battery.

On the basis of the above technical solution, if the ambient temperature is lower than the first preset temperature, controlling the fuel cell system to continue charging the power battery includes:

if the environment temperature is lower than the first preset temperature, judging whether the SOC value of the power battery is lower than a preset SOC value or not;

and if the SOC value of the power battery is lower than the preset SOC value, controlling the fuel cell system to continuously charge the power battery until the SOC value is not less than the preset SOC value.

By adopting the technical scheme, the power battery stores enough electric quantity before powering off, so that the power battery can still normally supply power for the driving system when the vehicle is restarted after being stored at low temperature for a long time.

On the basis of the above technical solution, after controlling the fuel cell system to continue charging the power battery to the SOC value of the power battery not less than the preset SOC value if the SOC value of the power battery is lower than the preset SOC value, the method further includes:

after charging, the fuel cell system is controlled to cut off high voltage, high voltage is put under the whole vehicle, and finally low voltage is cut off and power is cut off.

On the basis of the above technical solution, if the ambient temperature is lower than the first preset temperature, after determining whether the SOC value of the power battery is lower than a preset SOC value, the method further includes:

and if the SOC value of the power battery is not lower than the preset SOC value, directly controlling a fuel cell system to cut off high voltage, putting the whole vehicle under high voltage, finally cutting off low voltage and cutting off power.

On the basis of the technical scheme, after the ignition lock is turned off and whether the ambient temperature is lower than the first preset temperature is judged, the method further comprises the following steps:

and if the ambient temperature is not lower than the first preset temperature, directly controlling the fuel cell system to cut off the high voltage, putting the whole vehicle under the high voltage, and finally cutting off the low voltage and powering off.

On the basis of the technical scheme, the low-temperature protection method of the power battery further comprises the following steps:

after the ignition lock is started, judging whether the temperature of the power battery is lower than a second preset temperature or not;

and if the temperature of the power battery is lower than the second preset temperature, the power battery is enabled to supply power to the heating device until the heating device heats the power battery to the second preset temperature.

On the basis of the technical scheme, after the ignition lock is started and whether the temperature of the power battery is lower than a second preset temperature is judged, the method comprises the following steps:

and if the temperature of the power battery is not lower than the second preset temperature, controlling the power battery to directly supply power for a driving system.

In a second aspect, the present application provides a low temperature protection device for a power battery, comprising:

the ignition lock control device comprises a first module, a second module and a third module, wherein the first module is used for judging whether the ambient temperature is lower than a first preset temperature or not after the ignition lock is turned off;

and the second module is used for controlling the fuel cell system to continue charging the power battery when the first module determines that the ambient temperature is lower than the first preset temperature.

The second module is specifically used for judging whether the SOC value of the power battery is lower than a preset SOC value after the first module judges that the ambient temperature is lower than the first preset temperature, and controlling the fuel cell system to continue charging the power battery until the SOC value is not smaller than the preset SOC value after the SOC value of the power battery is judged to be lower than the preset SOC value.

In a third aspect, the present application provides a computer-readable storage medium, having a computer program stored thereon, where the computer program, when executed by a processor, implements the steps of the method for low-temperature protection of a power battery as described above.

In a fourth aspect, the present application provides a computer device comprising a processor, a memory, and a computer program stored on the memory and executable by the processor, wherein the computer program, when executed by the processor, implements the steps of the above-mentioned method for low-temperature protection of a power battery.

In a fifth aspect, the present application provides a vehicle, which is a fuel cell electric vehicle driven by a fuel cell and an auxiliary power cell in combination, and includes the computer device or the computer-readable storage medium, and when the computer program is executed by using the computer device or the computer-readable storage medium, the steps of the method for protecting a power cell from low temperature can be implemented.

The application provides a low-temperature protection method and device for a power battery, computer equipment and a computer readable storage medium, which are used for judging whether to continuously charge the power battery according to the ambient temperature before power off and the residual electric quantity of the power battery, so that the problem that the power battery cannot normally supply power to a power system after a vehicle is stored at a low temperature for a long time and when the vehicle is started is solved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a system of a fuel cell electric vehicle driven by a fuel cell and an auxiliary power cell in combination according to an embodiment of the present application.

Fig. 2 is a system of a fuel cell electric vehicle driven by a fuel cell and an auxiliary power cell in combination according to an embodiment of the present application.

Fig. 3 is a schematic flow chart of a method for protecting a power battery from low temperature according to an embodiment of the present disclosure;

fig. 4 is a schematic block diagram of a low-temperature protection device for a power battery according to an embodiment of the present application;

fig. 5 is a block diagram schematically illustrating a structure of a computer device according to an embodiment of the present application.

The objectives, features, and advantages of the present application will be further described with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The flow diagrams depicted in the figures are merely illustrative and do not necessarily include all of the elements and operations/steps, nor do they necessarily have to be performed in the order depicted. For example, some operations/steps may be decomposed, combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.

The embodiment of the application provides a low-temperature protection method and device for a power battery, computer equipment and a computer readable storage medium. The low-temperature protection method of the power battery can be applied to computer equipment, and the computer equipment can be electronic equipment such as a notebook computer and a desktop computer. The computer equipment is not only suitable for vehicles with hydrogen fuel as a main power source, but also has reference value and reference significance for other vehicles taking the power battery system as a power source in cooperation, namely, the power battery can be charged by the aid of other power sources, the heating performance of the power battery system for restarting in a low-temperature environment is ensured, and the low-temperature protection effect is achieved.

The system structure of the fuel cell electric vehicle driven by the fuel cell and the auxiliary power cell in a combined manner is shown in fig. 1, and the system of the fuel cell electric vehicle comprises a fuel cell system, a power output control system and a driving system, wherein the fuel cell system and the power cell system are connected with the power output control system. And the power output control system is used for controlling the power source output supply and the energy distribution of the fuel cell system and the power cell system. The fuel cell system is used for providing main power for the driving system, the power cell system is used for providing power guarantee for the driving system before the fuel cell system is started, and when the output power of the fuel cell system is larger than that required by the driving system or the driving system is reversely charged, redundant power is stored.

Fig. 2 further shows a system of a fuel cell electric vehicle based on the present application, wherein the power output control system includes a vehicle control unit and a high voltage distribution box, the vehicle control unit controls the operation of each high voltage distribution unit in the high voltage distribution box by sending a control command to the high voltage distribution box, and a contactor and an insurance for controlling the operation of the power battery system and the fuel cell system are provided in the high voltage distribution box.

In the prior art, when the ignition lock is turned off during parking, the vehicle control unit sends unloading enable to the controllers of all the systems and receives feedback of all the controllers, and after all the systems meet preset requirements, high-voltage power-down and low-voltage power-down are sequentially carried out to complete the power-down process.

According to the method and the device, the ambient temperature is detected firstly when the ignition lock is turned off during parking, whether the fuel cell system is controlled to continue to charge the power cell system is determined according to whether the ambient temperature is lower than a first preset value, and sufficient power output is guaranteed when the power cell system is restarted in a low-temperature environment. Preferably, the power battery system is charged to the SOC value which can meet the requirement that the power battery can output relatively stable electric power when the power battery is restarted in a low-temperature environment, and then the output of the fuel battery system is cut off, so that the surplus of supplementary electric quantity and the waste of charging time are avoided.

The power battery heating performance of the power battery is guaranteed to be enough to maintain the next power battery heating performance of power cycle before the power of the vehicle is cut off, although the waiting time for cold start of the power battery can be spent, the time is greatly shorter than the time for frequent heating of the power battery system caused by real-time monitoring and heating at any time when the vehicle is parked in a low-temperature environment, and the purpose of normal low-temperature start and protection of the power battery system is achieved.

Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.

Referring to fig. 3, fig. 3 is a schematic flow chart of a low-temperature protection method for a power battery according to an embodiment of the present disclosure.

As shown in fig. 3, the low temperature protection method for the power battery includes steps S101 to S102.

Step S101, after the ignition lock is turned off, judging whether the ambient temperature is lower than a first preset temperature;

exemplarily, an environment temperature detection circuit is arranged at the periphery of the vehicle, and a temperature sensor for detecting air temperature is arranged in the environment temperature detection circuit; when the vehicle control unit receives an ignition lock turn-off instruction, the instruction ambient temperature detection circuit detects the ambient temperature and sends the detected ambient temperature data to the first module 401, and the first module 401 compares the received ambient temperature data with a first preset temperature and judges whether the ambient temperature is lower than the first preset temperature. Preferably, the first preset temperature is-30 ℃ to-15 ℃, more preferably, the first preset temperature is-15 ℃.

And step S102, controlling the fuel cell system to continuously charge the power battery.

Exemplarily, if the temperature sensor detects that the ambient temperature is-20 ℃ and the first preset temperature is-15 ℃ in step S101, the first module 401 compares the received ambient temperature data of-20 ℃ with the first preset temperature of-15 ℃, determines that the ambient temperature of-20 ℃ is lower than the first preset temperature of-15 ℃, the first module 401 sends a signal to the second module 402, and the second module 402 controls the fuel cell system to continue to charge the power cell after receiving the signal; preferably, the first module 401 further sends a signal to the vehicle control unit, the vehicle control unit turns off the driving system, and the fuel cell system no longer supplies power to the driving system, so as to ensure the efficiency of charging the power battery by the fuel cell system.

In an embodiment, specifically, step S102 includes: substeps 1021 to substep S1022.

And a substep S1021, judging whether the SOC value of the power battery is lower than a preset SOC value.

Exemplarily, if the temperature sensor detects that the ambient temperature is-20 ℃ and the first preset temperature is-15 ℃ in step S101, the first module 401 compares the received ambient temperature data of-20 ℃ with the first preset temperature of-15 ℃, determines that the ambient temperature of-20 ℃ is lower than the first preset temperature of-15 ℃, the first module 401 starts the power battery electric quantity detection circuit to continuously detect the SOC value of the power battery, and sends the SOC value data of the power battery to the submodule a, and the submodule a determines whether the received SOC value is lower than the preset SOC value; and when the SOC value of the power battery is lower than the preset SOC value, the submodule A sends a signal to the submodule B. Preferably, the preset SOC value is 45% to 100%, more preferably, the preset SOC value is 45% and the SOC value is 45% which can satisfy the requirement that the power battery can be heated to the cold start temperature above 2 ℃ in the current low-temperature environment, so that the reserved battery capacity of the electric pile energy can be continuously received after the electric pile is cold started, and the SOC value passes the test and the real vehicle verification.

And a substep S1022 of controlling the fuel cell system to continuously charge the power battery until the SOC value of the power battery is not less than the preset SOC value.

Exemplarily, if the power battery electric quantity detection circuit detects that the actual SOC value of the power battery is 20%, the submodule a judges that the received actual SOC value is 20% lower than the preset SOC value of 45%, sends a signal to the submodule B, and the submodule B controls the fuel battery system to be disconnected from the electric connection with the driving system and continues to charge the power battery after receiving the signal of the submodule a; when the power battery electric quantity detection circuit monitors that the actual SOC value of the power battery reaches 45% of the preset SOC value, the submodule A judges that the received actual SOC value is not lower than 45% of the preset SOC value and sends a signal to the submodule B, the submodule B controls the fuel battery system to stop charging the power battery, and the submodule A also controls the power battery electric quantity detection circuit to stop detecting the SOC value of the power battery.

And S1023, the vehicle controller sends unloading enable to the controllers of the systems and receives feedback of each controller, and after the systems meet preset requirements, high-voltage low-voltage power down and low-voltage power down are sequentially carried out to complete the power down process.

Exemplarily, if the sub-module a determines that the received SOC value is 60% or less than the preset SOC value of 45% in the sub-step S1021, the sub-module a sends a signal to the vehicle controller, the vehicle controller sends an unloading enable to the controllers of the systems and receives feedback of each controller, and after the systems meet the predetermined requirement, the sub-module performs high-voltage power-down and low-voltage power-down in sequence to complete the power-down process.

And S103, the vehicle control unit sends unloading enable to the controllers of the systems and receives feedback of each controller, and after the systems meet preset requirements, high-voltage power down and low-voltage power down are sequentially carried out to complete the power down process.

Exemplarily, in step S101, the first module 401 compares the received environment temperature data of 25 ℃ with a first preset temperature of-15 ℃, and determines that the environment temperature of 25 ℃ is not lower than the first preset temperature of-15 ℃, then sends a signal to the vehicle controller, the vehicle controller sends an unloading enable to the controllers of the systems, and receives feedback of each controller, and after the systems meet a predetermined requirement, sequentially executes high-voltage power-down and low-voltage power-down to complete the power-down process.

The low-temperature protection method of the power battery further comprises a step S201 to a step S203.

Step S201, after the ignition lock is started, judging whether the temperature of the power battery is lower than a second preset temperature; if the temperature of the power battery is lower than the second preset temperature, the step S202 is executed; if the power battery temperature is not lower than the second preset temperature, the process proceeds to step S203.

Exemplarily, a power battery temperature detection circuit is arranged on the periphery of the power battery, and a temperature sensor for detecting the temperature of the power battery is arranged in the power battery temperature detection circuit; and when the vehicle control unit receives an ignition lock starting instruction, the power battery temperature detection circuit is started, the power battery temperature data are received, and whether the received power battery temperature data are lower than a second preset temperature or not is judged. Preferably, the second preset temperature is 0-2 ℃, and more preferably, the second preset temperature is 2 ℃.

Step S202, enabling the power battery to supply power to a heating device until the heating device heats the power battery to the second preset temperature.

Exemplarily, a power battery heating device is arranged around the power battery, and when the vehicle control unit determines that the temperature of the power battery is lower than a second preset temperature, the power battery is controlled to supply power to the power battery heating device, and the power battery is heated to a proper charging and discharging temperature, namely higher than 2 ℃, so that the power battery can receive extra output energy of the stack when the stack is in cold start.

And step S203, controlling the power battery to be directly electrified.

Exemplarily, when the temperature of the power battery is higher than a second preset temperature, the power battery enters a proper charging and discharging temperature, and can directly provide electric power for the driving system.

The low-temperature protection method of the power battery further comprises a step S301 to a step S302.

Step S301, in the driving mode, judging whether the power required by the driving system is larger than the power available by the fuel cell; if the power required by the driving system is larger than the power available by the fuel cell, the step S302 is entered; if the power required by the driving system is less than the power available from the fuel cell, the step S303 is executed; if the power required by the driving system is equal to the power available from the fuel cell, the step S304 is executed;

and step S302, controlling the fuel cell and the power battery to simultaneously supply power to the driving system.

Step S303, controlling the fuel cell to supply power to the driving system and charge the power battery at the same time;

and step S304, controlling the fuel cell to only supply power to the driving system, and controlling the power cell not to charge and discharge.

Referring to fig. 4, fig. 4 is a schematic block diagram of a low-temperature protection device for a power battery according to an embodiment of the present disclosure.

As shown in fig. 4, the low-temperature protection device for power battery includes: a first module 401 and a second module 402.

A first module 401, configured to determine whether an ambient temperature is lower than a first preset temperature after the ignition lock is turned off;

a second module 402 for controlling the fuel cell system to continue charging the power cell when the first module 401 determines that the ambient temperature is below the first preset temperature.

It should be noted that, as will be clear to those skilled in the art, for convenience and brevity of description, the specific working processes of the apparatus and the modules and units described above may refer to the corresponding processes in the foregoing embodiments, and are not described herein again.

The apparatus provided by the above embodiments may be implemented in the form of a computer program that can be run on a computer device as shown in fig. 5.

Referring to fig. 5, fig. 5 is a schematic block diagram of a computer device according to an embodiment of the present disclosure. The computer device may be a terminal.

As shown in fig. 5, the computer device includes a processor, a memory, and a network interface connected by a system bus, wherein the memory may include a nonvolatile storage medium and an internal memory.

The non-volatile storage medium may store an operating system and a computer program. The computer program comprises program instructions which, when executed, cause a processor to perform any of the methods.

The processor is used for providing calculation and control capability and supporting the operation of the whole computer equipment.

The internal memory provides an environment for the execution of a computer program on a non-volatile storage medium, which when executed by a processor causes the processor to perform any of the methods.

The network interface is used for network communication, such as sending assigned tasks and the like. Those skilled in the art will appreciate that the architecture shown in fig. 5 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.

It should be understood that the Processor may be a Central Processing Unit (CPU), and the Processor may be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. Wherein a general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.

Wherein, in one embodiment, the processor is configured to execute a computer program stored in the memory to implement the steps of:

in one embodiment, the processor is configured to, if the ambient temperature is lower than the first preset temperature, control the fuel cell system to continue charging the power battery, and is configured to:

In one embodiment, after the ignition lock is turned off, the processor is configured to, when determining whether the ambient temperature is lower than a first preset temperature, implement:

In one embodiment, the processor is configured to control the fuel cell system to continue charging the power battery to the SOC value not less than the preset SOC value if the SOC value of the power battery is lower than the preset SOC value, and is configured to:

In one embodiment, the processor is configured to determine whether the SOC value of the power battery is lower than a preset SOC value if the ambient temperature is lower than the first preset temperature, and is configured to:

In one embodiment, after the processor starts the ignition lock, when determining whether the temperature of the power battery is lower than a second preset temperature, the processor is configured to:

Embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, where the computer program includes program instructions for low-temperature protection of a power battery, and a method for low-temperature protection of a power battery, which is implemented when the program instructions for low-temperature protection of a power battery are executed, may refer to various embodiments of the present application.

The computer-readable storage medium may be an internal storage unit of the computer device described in the foregoing embodiment, for example, a hard disk or a memory of the computer device. The computer readable storage medium may also be an external storage device of the computer device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the computer device.

The embodiment of the present application further provides a vehicle, which is a fuel cell electric vehicle driven by a fuel cell and an auxiliary power cell in combination, and the vehicle includes the above computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, the computer program includes a low-temperature protection program instruction of the power cell, and a low-temperature protection method of the power cell, which is implemented when the low-temperature protection program instruction of the power cell is executed, may refer to various embodiments of the present application.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.

The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments. While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A low-temperature protection method of a power battery is characterized by comprising the following steps:

2. The low-temperature protection method for the power battery according to claim 1, characterized in that: if the ambient temperature is lower than the first preset temperature, controlling the fuel cell system to continue charging the power battery, including:

3. The low-temperature protection method for the power battery according to claim 2, characterized in that: after the step of controlling the fuel cell system to continue charging the power battery to the SOC value not less than the preset SOC value if the SOC value of the power battery is lower than the preset SOC value, the method further includes:

4. The low-temperature protection method for the power battery according to claim 2, characterized in that: if the environment temperature is lower than the first preset temperature, after judging whether the SOC value of the power battery is lower than a preset SOC value, the method further comprises the following steps:

5. The low-temperature protection method for the power battery according to claim 1, characterized in that: after the ignition lock is turned off, after whether the ambient temperature is lower than a first preset temperature is judged, the method further comprises the following steps:

6. The low-temperature protection method for the power battery according to claim 1, characterized in that: further comprising:

7. The low-temperature protection method of the power battery according to claim 6, characterized in that: if the fuel cell system is not started, after judging whether the temperature of the power cell is lower than a second preset temperature, the method comprises the following steps:

8. A low-temperature protection device of a power battery is characterized by comprising:

9. A computer arrangement, characterized in that the computer arrangement comprises a processor, a memory, and a computer program stored on the memory and executable by the processor, wherein the computer program, when executed by the processor, carries out the steps of the method for cryo-protection of a power cell according to any of claims 1 to 7.

10. A computer-readable storage medium, characterized in that a computer program is stored on the computer-readable storage medium, wherein the computer program, when being executed by a processor, carries out the steps of the method for cryogenic protection of a power cell according to any one of claims 1 to 7.