Heating method and device of power battery, vehicle and storage medium

Abstract

This application relates to the field of fuel cell electric vehicle technology, and particularly to a heating method, apparatus, vehicle, and storage medium for a power battery. The method includes: identifying the current temperature of the power battery; obtaining a heating shutdown threshold for the power battery and the minimum temperature at which the fuel cell allows charging the power battery at rated power; determining a target heating temperature for the power battery based on the heating shutdown threshold and the minimum temperature; and heating the power battery until the current temperature reaches the target temperature. This solves the problems of relatively simple power battery heating methods that fail to fully utilize the charging and discharging performance of the power battery at low temperatures, resulting in poor power performance and a poor user experience in fuel cell vehicles at low temperatures.

Description

Technical Field

[0001] This application relates to the field of fuel cell electric vehicle technology, and in particular to a heating method, apparatus, vehicle, and storage medium for a power battery. Background Technology

[0002] Fuel cell vehicles typically consist of a fuel cell and a power battery. The fuel cell charges the power battery, which in turn powers the vehicle. Therefore, ensuring the charging and discharging performance of the power battery is crucial.

[0003] Because the activity of the active materials inside lithium-ion batteries decreases significantly during low-temperature charging and discharging, the charging and discharging performance of the power battery is easily severely degraded, resulting in a slow response rate. Therefore, it is necessary to heat the power battery during the low-temperature operation of fuel cell vehicles.

[0004] However, the heating control strategy in related technologies, which relies on heating start-up and heating stop-down thresholds based on the power battery, is relatively simple and cannot fully utilize the charging and discharging performance of the power battery at low temperatures. This results in poor power performance of fuel cell vehicles at low temperatures and a poor user experience, which urgently needs to be addressed. Summary of the Invention

[0005] This application provides a heating method, device, vehicle, and storage medium for a power battery, in order to solve the problems that the heating methods for power batteries in the related technologies are relatively simple, which cannot fully utilize the charging and discharging performance of the power battery under low temperature conditions, resulting in poor power performance and poor user experience of fuel cell vehicles under low temperature conditions.

[0006] The first aspect of this application provides a method for heating a power battery, comprising the following steps: identifying the current temperature of the power battery; obtaining a heating shutdown threshold of the power battery and a minimum temperature at which the fuel cell allows the power battery to be charged at rated power; determining a target temperature for heating the power battery based on the heating shutdown threshold and the minimum temperature; and heating the power battery until the current temperature reaches the target temperature.

[0007] Optionally, heating the power battery further includes: determining the maximum allowable discharge power of the power battery based on the current temperature; and heating the power battery based on the maximum discharge power.

[0008] Optionally, determining the target temperature for heating the power battery based on the heating shutdown threshold and the minimum temperature includes: using the larger of the heating shutdown threshold and the minimum temperature as the target temperature.

[0009] Optionally, before heating the power battery, the method further includes: obtaining a heating activation threshold for the power battery; if the current temperature is less than the heating activation threshold, then heating the power battery.

[0010] Optionally, after heating the power battery, the method further includes generating a low-temperature heating notification for the power battery.

[0011] A second aspect of this application provides a heating device for a power battery, comprising: an identification module for identifying the current temperature of the power battery; an acquisition module for acquiring a heating shutdown threshold of the power battery and a minimum temperature at which the fuel cell allows the power battery to be charged at rated power, and determining a target temperature for heating the power battery based on the heating shutdown threshold and the minimum temperature; and a heating module for heating the power battery until the current temperature reaches the target temperature.

[0012] Optionally, the heating module is further configured to: determine the maximum allowable discharge power of the power battery based on the current temperature; and heat the power battery based on the maximum discharge power.

[0013] Optionally, the acquisition module is further configured to: use the larger of the heating shutdown threshold and the minimum temperature as the target temperature.

[0014] Optionally, the heating module is further configured to: obtain a heating activation threshold of the power battery; and if the current temperature is less than the heating activation threshold, heat the power battery.

[0015] Optionally, the heating module is further configured to: generate a low-temperature heating indicator for the power battery.

[0016] A third aspect of this application provides a vehicle comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the heating method for a power battery as described in the above embodiments.

[0017] A fourth aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the heating method for a power battery as described in the above embodiments.

[0018] Therefore, this application has at least the following beneficial effects:

[0019] The embodiments of this application can jointly determine the target heating temperature of the power battery based on the heating shutdown threshold for normal discharge and the optimal charging temperature, thereby achieving heating of the power battery under low temperature conditions. This fully considers the impact of temperature on the charging and discharging of the power battery when heating it at low temperatures, taking into account both charging and discharging requirements, effectively improving the low-temperature charging and discharging performance of the power battery, and thus improving the power performance of fuel cell vehicles under low temperature conditions, and enhancing the user experience.

[0020] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0021] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein:

[0022] Figure 1 This is a flowchart illustrating a heating method for a power battery according to an embodiment of this application;

[0023] Figure 2 This is a flowchart illustrating the cryogenic heating process for a fuel cell electric vehicle according to an embodiment of this application.

[0024] Figure 3 This is a block diagram of a heating device for a power battery according to an embodiment of this application;

[0025] Figure 4 This is a structural schematic diagram of a vehicle according to an embodiment of this application. Detailed Implementation

[0026] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0027] The following description, with reference to the accompanying drawings, illustrates a heating method, apparatus, vehicle, and storage medium for a power battery according to embodiments of this application. Addressing the issue mentioned in the background art where the heating methods for power batteries are relatively simple and cannot fully utilize the charging and discharging performance of the power battery at low temperatures, resulting in poor power performance and a poor user experience in fuel cell vehicles at low temperatures, this application provides a heating method for a power battery. In this method, a target heating temperature for the power battery can be determined based on the heating shutdown threshold for normal discharge and the optimal charging temperature, thereby achieving heating of the power battery at low temperatures. This fully considers the impact of temperature on the charging and discharging of the power battery during low-temperature heating, balancing charging and discharging needs and effectively improving the low-temperature charging and discharging performance of the power battery. This, in turn, improves the power performance of fuel cell vehicles at low temperatures and enhances the user experience. Therefore, this method solves the problems of the relatively simple heating methods for power batteries, which cannot fully utilize the charging and discharging performance of the power battery at low temperatures, resulting in poor power performance and a poor user experience in fuel cell vehicles at low temperatures.

[0028] Specifically, Figure 1 This is a schematic flowchart illustrating a heating method for a power battery provided in an embodiment of this application.

[0029] like Figure 1 As shown, the heating method for this power battery includes the following steps:

[0030] In step S101, the current temperature of the power battery is identified.

[0031] It is understood that in the embodiments of this application, the current temperature of the power battery can be detected by means of temperature sensors, etc., and the current temperature of the power battery is related to the actual operating conditions of the power battery. Among them, the ambient temperature has the greatest impact on the current temperature of the power battery. If the current actual ambient temperature is low, the current temperature of the power battery will also decrease.

[0032] In step S102, the heating shutdown threshold of the power battery and the minimum temperature at which the fuel cell allows the power battery to be charged at rated power are obtained, and the target temperature for heating the power battery is determined based on the heating shutdown threshold and the minimum temperature.

[0033] The heating shut-off threshold can be set according to different vehicle models and the actual type of power battery. For example, it can be set to 20℃ or 15℃, without specific limitations.

[0034] It is understandable that when the heating shut-off threshold is reached, it means that the power battery can discharge normally, and the discharge has little impact on the power battery at this time. The minimum temperature at which the fuel cell can charge the power battery at rated power can be understood as the power battery being able to charge the fuel cell at rated power when it is at or above the minimum temperature, and charging at this power will not cause damage to the power battery, which can effectively protect the power battery and improve its lifespan.

[0035] The power battery heating strategy needs to take into account that the temperature of the power battery is generally low during the cold start of the fuel cell stack. In order to continuously heat the battery to the cell temperature at which the power battery is at its maximum allowable charging power corresponding to the rated power of the fuel cell, and at the same time ensure good power performance of the whole vehicle, it is necessary to continuously heat the battery to achieve the purpose of quickly restoring power performance. It is necessary to consider not only the discharge temperature range that the power battery itself can be heated, but also the cell temperature of the power battery at the current allowable rechargeable power during the cold start of the vehicle.

[0036] Therefore, the embodiments of this application can jointly determine the target heating temperature of the power battery based on the heating shutdown threshold for normal discharge and the optimal charging temperature, thereby achieving heating of the power battery under low temperature conditions. This fully considers the impact of temperature on the charging and discharging of the power battery when heating it at low temperatures, taking into account both charging and discharging requirements, effectively improving the low-temperature charging and discharging performance of the power battery, and thus improving the power performance of fuel cell vehicles under low temperature conditions, thereby enhancing the user experience.

[0037] In this embodiment of the application, determining the target temperature for heating the power battery based on the heating shutdown threshold and the minimum temperature includes: using the larger value between the heating shutdown threshold and the minimum temperature as the target temperature.

[0038] It is understood that in this application embodiment, the heating shutdown threshold and the minimum temperature at which the fuel cell is allowed to charge the power battery at rated power are compared, and the larger value is used as the target temperature to improve the low-temperature start-up performance of fuel cell electric vehicles.

[0039] In step S103, the power battery is heated until the current temperature reaches the target temperature.

[0040] It is understood that the embodiments of this application continuously heat the power battery until the current temperature reaches the target temperature in order to quickly restore power performance, achieve rapid start-up in a short time, and improve the low-temperature start-up performance of fuel cell electric vehicles.

[0041] In this embodiment of the application, before heating the power battery, the method further includes: obtaining a heating start threshold of the power battery; if the current temperature is less than the heating start threshold, then heating the power battery.

[0042] The heating start threshold can be set according to the actual situation. For example, the heating start threshold can be 0℃ or -10℃, without specific limitation.

[0043] It is understood that in this embodiment of the application, when the current temperature of the power battery is detected to be lower than the heating activation threshold, the power battery is heated so that the power battery can quickly restore its power and ensure that the vehicle can start in a short time.

[0044] In this embodiment of the application, heating the power battery further includes: determining the maximum allowable discharge power of the power battery based on the current temperature; and heating the power battery based on the maximum discharge power.

[0045] It is understood that the embodiments of this application determine the maximum allowable discharge power of the power battery based on the current temperature, and control the heating relay to close to heat the power battery according to the maximum discharge power, so as to ensure that the heating function is performed when the power battery can discharge, so that the power battery can quickly restore power and ensure that the vehicle can start in a short time.

[0046] In this embodiment of the application, after heating the power battery, the method further includes: generating a low-temperature heating prompt for the power battery.

[0047] It is understandable that this application generates a low-temperature heating warning for the power battery after heating it, in order to remind the driver that the power battery is currently in a heated state.

[0048] The heating method for the power battery proposed in the embodiments of this application can determine the target heating temperature of the power battery based on the heating shutdown threshold for normal discharge and the optimal charging temperature. This enables heating of the power battery at low temperatures, thus fully considering the impact of temperature on the charging and discharging of the power battery during low-temperature heating. It can take into account both charging and discharging requirements, effectively improve the low-temperature charging and discharging performance of the power battery, thereby improving the power performance of fuel cell vehicles at low temperatures and enhancing the user experience.

[0049] The following will combine Figure 2 The heating method for the power battery proposed in this application is described in detail below:

[0050] This application mainly consists of several modules: FCU (Fuel-cell Control Unit), VCU (Vehicle Control Unit), and BMS (Battery Management System). The FCU detects signals such as ambient temperature and fuel engine coolant temperature and responds to the power requests from the VCU according to the start-up control strategy. The VCU detects the vehicle's driving status and determines the allowable charging power of the power battery at the current cell temperature. The BMS detects the cell temperature and requests to start or stop the power battery heating.

[0051] When a fuel cell electric vehicle starts in a low-temperature environment, the power battery first enters the vehicle heating process. The vehicle uses temperature sensors to monitor the current temperature of the power battery in real time and determine whether the current temperature meets the low-temperature heating conditions. When the current temperature of the power battery is lower than the set heating start threshold T1, the BMS executes the vehicle heating process. As the power battery heats up, the power battery temperature gradually increases. During this process, it is necessary to obtain the power battery heating shut-off threshold and the minimum temperature at which the fuel cell is allowed to charge the power battery at rated power. When the current temperature of the power battery reaches its set shut-off threshold T2 and the maximum allowable charging temperature of the power battery corresponding to the rated power of the fuel cell is T0 < T2, the BMS executes the heating shut-off process. If the maximum allowable charging temperature of the power battery corresponding to the rated power of the fuel cell is T0 > T2, the power battery continues to heat up to T0. When the current temperature of the power battery reaches T0, the BMS executes the heating shut-off process.

[0052] In summary, the embodiments of this application mainly combine the low-temperature heating strategy of the power battery with the low-temperature start-up performance development strategy of the hydrogen fuel cell engine. This ensures both the low-temperature heating performance of the battery and the allowable charging power of the fuel cell during low-temperature start-up. Furthermore, based on the existing architecture of fuel cell electric vehicles, no additional components are required; the control strategy function can be implemented only through the CAN (Controller Area Network) bus.

[0053] Next, the heating device for a power battery according to an embodiment of this application is described with reference to the accompanying drawings.

[0054] Figure 3 This is a block diagram of a heating device for a power battery according to an embodiment of this application.

[0055] like Figure 3 As shown, the heating device 10 of the power battery includes: an identification module 100, an acquisition module 200, and a heating module 300.

[0056] The identification module 100 is used to identify the current temperature of the power battery; the acquisition module 200 is used to acquire the heating shutdown threshold of the power battery and the minimum temperature at which the fuel cell allows the power battery to be charged at rated power, and to determine the target temperature for heating the power battery based on the heating shutdown threshold and the minimum temperature; the heating module 300 is used to heat the power battery until the current temperature reaches the target temperature.

[0057] In this embodiment, the heating module is further configured to: determine the maximum allowable discharge power of the power battery based on the current temperature; and heat the power battery based on the maximum discharge power.

[0058] In this embodiment of the application, the acquisition module is further configured to: use the larger of the heating shutdown threshold and the minimum temperature as the target temperature.

[0059] In this embodiment of the application, the heating module is further used to: obtain the heating start threshold of the power battery; if the current temperature is less than the heating start threshold, then heat the power battery.

[0060] In this embodiment, the heating module is further used to: generate a low-temperature heating indicator for the power battery.

[0061] It should be noted that the explanation of the above-described embodiment of the heating method for the power battery also applies to the heating device for the power battery in this embodiment, and will not be repeated here.

[0062] The heating device for the power battery proposed in the embodiments of this application can determine the target heating temperature of the power battery based on the heating shutdown threshold for normal discharge and the optimal charging temperature, thereby achieving heating of the power battery at low temperatures. This fully considers the impact of temperature on the charging and discharging of the power battery when heating it at low temperatures, thus taking into account both charging and discharging requirements, effectively improving the low-temperature charging and discharging performance of the power battery, thereby improving the power performance of fuel cell vehicles at low temperatures and enhancing the user experience.

[0063] Figure 4 A schematic diagram of the structure of a vehicle provided in an embodiment of this application. The vehicle may include:

[0064] The memory 401, the processor 402, and the computer program stored on the memory 401 and capable of running on the processor 402.

[0065] When the processor 402 executes the program, it implements the heating method for the power battery provided in the above embodiments.

[0066] Furthermore, the vehicle also includes:

[0067] Communication interface 403 is used for communication between memory 401 and processor 402.

[0068] The memory 401 is used to store computer programs that can run on the processor 402.

[0069] The memory 401 may include high-speed RAM (Random Access Memory) memory, and may also include non-volatile memory, such as at least one disk storage.

[0070] If the memory 401, processor 402, and communication interface 403 are implemented independently, then the communication interface 403, memory 401, and processor 402 can be interconnected via a bus to complete communication between them. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 4 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0071] Optionally, in a specific implementation, if the memory 401, processor 402, and communication interface 403 are integrated on a single chip, then the memory 401, processor 402, and communication interface 403 can communicate with each other through an internal interface.

[0072] Processor 402 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement embodiments of this application.

[0073] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described method for heating a power battery.

[0074] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0075] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0076] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0077] It should be understood that the various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or more of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (FPGAs), field-programmable gate arrays (FPGAs), etc.

[0078] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0079] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A method of heating a power cell, characterized by, Includes the following steps: Identify the current temperature of the power battery; The heating shutdown threshold of the power battery and the minimum temperature at which the fuel cell allows the power battery to be charged at rated power are obtained. The target temperature for heating the power battery is determined based on the heating shutdown threshold and the minimum temperature, wherein the larger value between the heating shutdown threshold and the minimum temperature is taken as the target temperature. The power battery is heated until the current temperature reaches the target temperature; wherein, heating the power battery further includes: determining the maximum allowable discharge power of the power battery based on the current temperature; and heating the power battery based on the maximum discharge power.

2. The method of claim 1, wherein the heating is performed by applying a voltage to the power cell. Before heating the power battery, the process also includes: Obtain the heating activation threshold of the power battery; If the current temperature is lower than the heating activation threshold, then the power battery is heated.

3. The method of claim 1, wherein the heating is performed by applying a voltage to the power battery. After heating the power battery, the process also includes: A low-temperature heating alert is generated for the power battery.

4. A heating device for a power cell, characterized in that include: The identification module is used to identify the current temperature of the power battery; The acquisition module is used to acquire the heating shutdown threshold of the power battery and the minimum temperature at which the fuel cell allows the power battery to be charged at rated power, and to determine the target temperature for heating the power battery based on the heating shutdown threshold and the minimum temperature, wherein the larger value between the heating shutdown threshold and the minimum temperature is taken as the target temperature; A heating module is used to heat the power battery until the current temperature reaches the target temperature, wherein the heating module is further used to: determine the maximum allowable discharge power of the power battery based on the current temperature; The power battery is heated based on the maximum discharge power.

5. A vehicle characterized by comprising: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, the processor executing the program to implement the heating method for a power battery as described in any one of claims 1-3.

6. A computer-readable storage medium having stored thereon a computer program, characterized in that, The program is executed by the processor to implement the heating method for the power battery as described in any one of claims 1-3.

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