Battery heat preservation device, heat preservation method, electronic equipment and storage medium

Abstract

The embodiment of the invention provides a battery heat preservation device and method, electronic equipment and a storage medium, and relates to the technical field of power batteries. The main positive relay is arranged in a battery high-voltage main loop, a first end of the main positive relay is connected with the battery high-voltage main loop, a second end of the main positive relay is connected with a total negative end of the battery high-voltage main loop, and the main positive relay comprises at least one heating element, is arranged on a battery cross beam, is close to one side of a battery end plate and is used for heating the battery end plate after a heat preservation condition is met. And heating the end part of the battery module. The end parts of the batteries are heated by actively controlling the heating loop, so that the middle-hot and two-end-cold states of the batteries are improved, and the problem of large temperature difference in the battery pack is solved.

Description

Technical Field

[0001] This application relates to the technical field of power batteries, and more particularly, to a battery thermal insulation device, a thermal insulation method, an electronic device, and a storage medium. Background Art

[0002] The comfortable operating temperature range of a power battery system is generally between 15°C and 35°C. In a low-temperature environment, due to the large size of the power battery pack, the internal temperature field dissipates heat unevenly, and it is easy to have a large temperature difference inside the battery pack. When there is a large temperature difference inside the battery pack, the internal resistance of the battery will increase significantly, affecting the battery power characteristics. The whole vehicle shows poor acceleration experience and insufficient power; the capacity retention rate of the battery also decreases synchronously at low temperatures, and the whole vehicle shows that the low-temperature endurance is greatly reduced compared with normal temperature, and the experience is poor. Summary of the Invention

[0003] The purpose of the embodiments of this application is to provide a battery thermal insulation device, a thermal insulation method, an electronic device, and a storage medium, which actively control the heating circuit to heat the battery ends, improve the state of the battery with hot in the middle and cold at both ends, and solve the problem of large temperature difference inside the battery pack.

[0004] In a first aspect, this application provides a battery thermal insulation device, which includes: a thermal insulation circuit disposed in the battery high-voltage main circuit, with its first end connected to the main positive relay of the battery high-voltage main circuit and its second end connected to the total negative of the battery high-voltage main circuit, and includes at least one heating element disposed on the battery crossbeam and close to the side of the battery end plate, for turning on the thermal insulation circuit to heat the ends of the battery module after meeting the thermal insulation conditions.

[0005] In the technical solution of the embodiments of this application, by controlling the start of the thermal insulation circuit, the battery ends are actively heated, the thermal insulation function of the battery is realized, the thermal insulation ability of the battery is improved, the state of the battery with hot in the middle and cold at both ends is improved, the consistency of the working temperature of the battery cells of the power battery is improved, and further the battery performance and the vehicle endurance in a low-temperature environment are improved.

[0006] In some embodiments, the heating element includes: a first heating film and a second heating film, which are fixed to the battery crossbeam through a heat-conducting fixing member. By setting heating films on the crossbeam at the battery ends, the battery is actively heated to improve the temperature difference of the battery and realize the thermal insulation function of the battery.

[0007] In some embodiments, the thermal insulation circuit further includes a thermal insulation relay, which is connected in series with the first heating film and the second heating film and communicatively connected to the battery management system. The thermal insulation relay is configured to close after the thermal insulation condition is met, so as to heat the ends of the battery module through the first heating film and the second heating film. By means of the thermal insulation relay, the opening and closing state of the thermal insulation circuit is controlled to achieve active control of the battery thermal insulation function.

[0008] Second, the embodiments of the present application provide a battery thermal insulation method in China, which is applied to the battery thermal insulation device described in the first aspect. The method includes: obtaining battery parameters; determining whether the thermal insulation relay is stuck; if not stuck, then determining the thermal insulation condition based on the battery parameters; if the thermal insulation condition is met, then starting the thermal insulation circuit to thermally insulate the battery. By determining the thermal insulation condition based on the battery parameters and starting the thermal insulation circuit after the thermal insulation condition is met to thermally insulate the battery, active control of the battery thermal insulation function is achieved, and the thermal insulation effect is better compared to passive thermal insulation.

[0009] In some embodiments, determining whether the thermal insulation relay is stuck includes: closing the main positive relay but not closing the thermal insulation relay, and obtaining the current of the thermal insulation circuit; if the current is within the set threshold range, then the thermal insulation relay is normal. If the thermal insulation relay is not stuck, the current on the thermal insulation circuit is 0. Therefore, the sticking of the thermal insulation relay can be judged by the magnitude of the current of the thermal insulation circuit.

[0010] In some embodiments, the battery parameters include the state of charge, the maximum battery temperature, the minimum battery temperature, and the ambient temperature. The determining the thermal insulation condition based on the battery parameters includes: determining whether the battery meets the thermal insulation condition based on the state of charge, the maximum battery temperature, the minimum battery temperature, and the ambient temperature. Whether the thermal insulation condition is met is determined based on the temperature difference distribution of the entire battery pack, so as to perform active thermal insulation.

[0011] In some embodiments, the determining whether the battery meets the thermal insulation condition based on the state of charge, the maximum battery temperature, the minimum battery temperature, and the ambient temperature includes: determining whether the state of charge meets the thermal insulation condition; if it meets, then determining whether the battery temperature difference meets the thermal insulation condition based on the ambient temperature, where the battery temperature difference is the difference between the maximum battery temperature and the minimum battery temperature. Only when the state of charge, the ambient temperature, and the temperature difference all meet the thermal insulation condition, the active thermal insulation function is turned on.

[0012] In some embodiments, determining whether the battery temperature difference meets the heat preservation condition based on the ambient temperature includes: if the ambient temperature is within the first temperature threshold range and the difference between the lowest battery temperature and the ambient temperature is greater than the second temperature threshold, and the battery temperature difference is within the temperature difference threshold range, then the heat preservation condition is met. The ambient temperature and the temperature difference are related. Only when the ambient temperature, the lowest battery temperature, and the temperature difference all meet the conditions, the heat preservation function will be turned on.

[0013] In a third aspect, the present application provides an electronic device, which includes a memory and a processor. The memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the above-mentioned battery heat preservation method.

[0014] In a fourth aspect, the present application provides a readable storage medium, in which computer program instructions are stored. When the computer program instructions are read and run by a processor, the above-mentioned battery heat preservation method is executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can also be obtained based on these drawings without creative efforts.

[0016] Figure 1 Schematic diagram of a battery heat preservation device provided by an embodiment of the present application;

[0017] Figure 2 Schematic diagram of a heat preservation circuit provided by an embodiment of the present application;

[0018] Figure 3 Schematic diagram of a first heating film provided by an embodiment of the present application;

[0019] Figure 4 Flowchart of a battery heat preservation method provided by an embodiment of the present application;

[0020] Figure 5 Flowchart of a method for judging whether a heat preservation relay is adhered provided by an embodiment of the present application;

[0021] Figure 6 Flowchart of a heat preservation condition judgment provided by an embodiment of the present application;

[0022] Figure 7 Specific implementation flowchart of a battery heat preservation method provided by an embodiment of the present application.

[0023] ICON:

[0024] 110 - Battery box; 120 - Battery crossbeam; 130 - Battery module; 140 - First heating film. Detailed implementation manners

[0025] The following will describe the technical solutions in the embodiments of the present application with reference to the accompanying drawings in the embodiments of the present application.

[0026] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0027] The heat dissipation of power batteries mainly includes two types: conduction heat dissipation and radiation heat dissipation. In a low-temperature environment, the main reason for the large temperature difference is conduction heat dissipation. Due to the high heat conduction rate at the positions of the power battery close to the crossbeam and the end plate, a temperature difference state of hot in the middle and cold at both ends is formed. Especially at extremely low temperatures, this problem is particularly obvious. In addition, existing thermal insulation methods mostly adopt passive thermal insulation. For example, an epoxy resin board 3420 is wrapped outside the battery module 130, and a high-density flame-retardant rubber and plastic board is connected and arranged outside the epoxy resin board 3420. Since the existing battery pack already has a plastic end plate, the thermal insulation effect of this thermal insulation method is very limited.

[0028] To solve the above technical problems, the embodiment of the present application provides a battery thermal insulation device. The device sets a thermal insulation circuit in the high-voltage main circuit of the battery, and the heating element in the thermal insulation circuit is arranged on the crossbeam in contact with the end plate. By actively controlling the start of the thermal insulation circuit, the heating element is used to heat the end of the battery, thereby forming a thermal barrier on the heat conduction path of the battery, improving the thermal insulation ability of the battery, reducing the heat dissipation rate of the battery cells near the end plate, and improving the temperature difference state of hot in the middle and cold at both ends of the battery.

[0029] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a battery thermal insulation device provided by the embodiment of the present application. The device includes: a thermal insulation circuit, which is set in the high-voltage main circuit of the battery. Its first end is connected to the main positive relay of the high-voltage main circuit of the battery, and the second end is connected to the total negative of the high-voltage main circuit of the battery. It includes at least one heating element, which is arranged on the battery crossbeam 120 and close to the side of the battery end plate, and is used to turn on the thermal insulation circuit to heat the end of the battery module 130 after meeting the thermal insulation conditions.

[0030] Exemplarily, the thermal insulation circuit is arranged in the main high-voltage circuit of the battery. Its first end is connected to the main positive relay, and the main positive relay is connected to the total positive. The second end can be connected to the total negative through a current sensor. A heating element is arranged on the thermal insulation circuit, and the heating element is arranged on the battery crossbeam 120. The battery crossbeam 120 is in contact with the battery end plate. By energizing the heating element through the thermal insulation circuit, the heating element generates heat to heat the end of the battery module 130.

[0031] By actively controlling the thermal insulation circuit to control the working state of the heating element, a heating circuit is formed. The heating element is arranged on the heat dissipation path of the battery. By heating the crossbeam, a thermal barrier is formed on the heat dissipation path, thereby realizing the thermal insulation effect on the battery, further improving the temperature difference state of the middle heat and the two ends cold of the battery module 13, enhancing the consistency of the operation of the battery cells inside the battery module 130, and prolonging the low-temperature cycle life of the battery.

[0032] Please refer to Figure 2 , Figure 2 which is a schematic diagram of the thermal insulation circuit. In some embodiments, the heating element includes: a first heating film 140 and a second heating film, which are fixed on the battery crossbeam 120 through a heat-conducting fixing member. As Figure 3 shown, it is a schematic diagram of the first heating film 140. The second heating film is symmetrically arranged with the first heating film 140 on the battery crossbeam 120 on the right side of the battery module 130 (not shown in the figure).

[0033] The first heating film 140 and the second heating film can be respectively arranged on the battery crossbeams 120 at the left and right ends of the battery, and the principle of resistance wire conducting heat can be used to generate heat. For the heat-conducting fixing member, such as heat-conducting structural adhesive can be used, and the first heating film 140 and the second heating film can be adhered to the battery crossbeam 120 through the heat-conducting structural adhesive.

[0034] The first heating film 140 and the second heating film are used to actively control the temperatures of the battery crossbeam 120 and the battery end plate, form a thermal barrier on the heat conduction path of the battery, improve the thermal insulation effect on the battery, and improve the temperature difference state of the middle heat and the two ends cold of the battery.

[0035] In some embodiments, the thermal insulation circuit further includes: a thermal insulation relay, which is connected in series with the first heating film 140 and the second heating film and is communicatively connected to the battery management system, and is used to close the thermal insulation relay after meeting the thermal insulation conditions to heat the end of the battery module 130 through the first heating film 140 and the second heating film.

[0036] When the battery has a heating requirement, the main positive relay and the thermal insulation relay can be closed, and the current passes through the thermal insulation circuit to the first heating film 140 and the second heating film, causing the first heating film 140 and the second heating film to generate heat, thereby realizing the thermal insulation effect on the battery. By using the thermal insulation relay to actively control the thermal insulation circuit, compared with passive thermal insulation, the thermal insulation requirement of the battery can be achieved through active control, effectively improving the battery's thermal insulation ability.

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in this application will be described clearly and completely below. In some embodiments, the hardware structure includes a battery box 110, a battery crossbeam 120, and a battery module 130. Among them, the battery module 130 is arranged in the battery box 110. Battery end plates are provided at the left and right ends of the battery module 130, and a battery crossbeam 120 is provided outside the battery end plates, and the battery end plates are in contact with the battery crossbeam 120. A first heating film 140 and a second heating film are respectively provided on the battery crossbeams 120 at the left and right ends near the battery end plate side. The first heating film 140 and the second heating film can be adhered to the corresponding battery crossbeam 120 by means of a thermally conductive structural adhesive or the like.

[0038] The electrical structure includes a thermal insulation circuit. The thermal insulation circuit includes a main positive relay, a thermal insulation relay. The first heating film 140 and the second heating film are connected in series with the thermal insulation relay and inserted into the battery high-voltage main circuit. Specifically, the thermal insulation relay is connected to the main positive relay, the second heating film is connected to a current sensor, and the current sensor is connected to the total negative of the battery high-voltage main circuit. When the battery has a thermal insulation requirement, the main positive relay and the thermal insulation relay are closed, and the current flows through the thermal insulation circuit (main positive relay - thermal insulation relay - first heating film 140 - second heating film) to heat the battery crossbeam 120, realizing the thermal insulation effect on the battery.

[0039] By using this thermal insulation circuit, the battery can be enabled to turn on the thermal insulation function under all-scenario working conditions such as vehicle dormancy, high-voltage power-on, and fast charging.

[0040] By actively controlling the thermal insulation circuit to achieve the thermal insulation of the power battery, the battery temperature difference can be effectively reduced, the working consistency of the power single cells can be improved, the charge and discharge capacity and discharge amount of the battery in a low-temperature environment can be effectively improved, the battery service life can be extended, and the low-temperature power performance experience and the vehicle endurance can be improved.

[0041] For the active control of the thermal insulation circuit, it is judged based on battery parameters. After meeting the thermal insulation conditions, the main positive relay and the thermal insulation relay are actively controlled to turn on the thermal insulation circuit to achieve the thermal insulation of the battery.

[0042] Please refer to Figure 4 , Figure 4It is a flowchart of a battery thermal insulation method, which can be applied to the above-mentioned battery thermal insulation device, specifically applied to the battery management system, and specifically includes the following steps:

[0043] S110: Obtain battery parameters;

[0044] S120: Determine whether the thermal insulation relay is stuck;

[0045] S130: If it is not stuck, judge the thermal insulation condition based on the battery parameters;

[0046] S140: If the thermal insulation condition is met, start the thermal insulation circuit to thermally insulate the battery.

[0047] When the thermal insulation relay is not stuck, that is, the thermal insulation relay is in a normal working state, then judge the thermal insulation condition. If the thermal insulation condition is met, that is, the battery has a thermal insulation requirement, the thermal insulation circuit can be started to thermally insulate the battery.

[0048] By judging the thermal insulation condition, after the thermal insulation condition is met, the thermal insulation circuit is opened through the main positive relay and the thermal insulation relay, realizing the active control and active thermal insulation of the thermal insulation circuit, so that the battery temperature difference is controlled within the target range in the whole use scenario, solving the problem of large temperature difference of the battery in a low-temperature environment, improving the internal temperature difference of the battery, enhancing the working consistency of the battery cells inside the battery pack, and thus prolonging the low-temperature cycle life of the battery.

[0049] Please refer to Figure 5 , Figure 5 It is a flowchart of a method for judging whether the thermal insulation relay is stuck. In some embodiments, judging whether the thermal insulation relay is stuck includes:

[0050] S121: Close the main positive relay but do not close the thermal insulation relay, and obtain the current of the thermal insulation circuit;

[0051] S122: If the current is within the set threshold range, the thermal insulation relay is normal.

[0052] Whether the thermal insulation relay is stuck can be judged by the magnitude of the current in the thermal insulation circuit. Close the main positive relay but do not close the thermal insulation relay. In an ideal situation, the current value at this time is 0. If the thermal insulation relay is stuck, the current will not be 0. Therefore, if the current value exceeds the threshold, it is considered that the thermal insulation relay is stuck, and the battery management system can report and contact for repair; if the current value is within the set threshold range, the thermal insulation relay is normal and the thermal insulation condition can be judged continuously.

[0053] Judging whether the thermal insulation relay is stuck can ensure that the thermal insulation circuit is in a normal working state, avoid the thermal insulation relay from being stuck, and improve safety.

[0054] In some embodiments, the battery parameters include state of charge, maximum battery temperature, minimum battery temperature, and ambient temperature. Judging the thermal insulation condition based on the battery parameters includes: judging whether the battery meets the thermal insulation condition based on the state of charge, maximum battery temperature, minimum battery temperature, and ambient temperature.

[0055] Here, the thermal insulation condition is judged based on battery parameters such as the state of charge, maximum battery temperature, minimum battery temperature, and ambient temperature. The state of charge, maximum battery temperature, minimum battery temperature, and ambient temperature are used to judge whether the battery meets the thermal insulation condition, so that when the battery has a thermal insulation requirement, the thermal insulation requirement can be met by actively controlling the thermal insulation circuit.

[0056] Please refer to Figure 6 , Figure 6 for the flowchart of judging the thermal insulation condition. In some embodiments, judging whether the battery meets the thermal insulation condition based on the state of charge, maximum battery temperature, minimum battery temperature, and ambient temperature includes:

[0057] S131: Judge whether the state of charge meets the thermal insulation condition;

[0058] S132: If it is satisfied, judge whether the battery temperature difference meets the thermal insulation condition based on the ambient temperature, where the battery temperature difference is the difference between the maximum battery temperature and the minimum battery temperature.

[0059] The thermal insulation condition includes two aspects: state of charge judgment and battery temperature difference judgment. If both are satisfied, the thermal insulation condition is met, and the thermal insulation relay can be controlled to turn on the thermal insulation circuit; if any one of the conditions is not satisfied, the thermal insulation circuit is turned off.

[0060] For the state of charge, a certain SOC value such as 15% can be set. If the state of charge is greater than the set value, the thermal insulation condition is met. Through the state of charge judgment, it is ensured that the battery has enough power for the battery thermal insulation function. Then, based on the ambient temperature, the battery temperature difference is judged. In a low-temperature environment, when the battery temperature difference is within the set range, the thermal insulation function can be turned on.

[0061] In some embodiments, judging whether the battery temperature difference meets the thermal insulation condition based on the ambient temperature includes: if the ambient temperature is within the first temperature threshold range and the difference between the minimum battery temperature (attTemp_min) and the ambient temperature is greater than the second temperature threshold, and the battery temperature difference is within the temperature difference threshold range, then the thermal insulation condition is met.

[0062] Exemplarily, set the ambient temperature to T °C. If T ≥ 10 °C, the heat preservation condition is not satisfied; if 0 °C ≤ T < 10 °C (the first threshold range), the minimum battery temperature BattTemp_min ≥ T + 5 °C (the second temperature threshold is 5 °C), and the battery temperature difference ΔT ∈ [4 °C, 7 °C] (the temperature difference threshold). That is, when the battery ambient temperature, the minimum battery temperature, and the temperature difference all meet the requirements, the heat preservation function is turned on.

[0063] As shown in the following table, the threshold examples of the ambient temperature, the minimum battery temperature, and the temperature difference are as follows:

[0064]

[0065] The corresponding minimum battery temperature and temperature difference thresholds for different ambient temperature ranges will also change accordingly. That is, the second temperature threshold corresponding to the minimum battery temperature is determined based on the ambient temperature. The first temperature threshold range, the second temperature threshold, and the temperature difference threshold can be calibrated and optimized according to specific needs, and no specific limitations are made here.

[0066] In the transition temperature range, keep the current state unchanged to prevent the heat preservation relay from closing and disconnecting repeatedly.

[0067] By setting the first threshold range, the second temperature threshold, and the temperature difference threshold corresponding to different ambient temperatures, the active control conditions for meeting the heat preservation conditions are given, which facilitates the battery management system to actively control the opening of the heat preservation relay according to temperature changes, realize the heat preservation of the battery, and meet the heat preservation requirements of the battery.

[0068] This method actively turns on the battery heat preservation function by collecting parameters such as the current, ambient temperature, maximum battery temperature, and minimum battery temperature of the power battery, effectively improves the battery heat preservation ability, ensures that the battery can enter the appropriate temperature range as soon as possible at low temperatures, and can effectively improve the low-temperature fast charging experience.

[0069] Through the heat preservation function, the battery temperature difference can be effectively reduced, the working consistency of the power single cells can be improved, the charge and discharge capacity and discharge amount of the battery can be effectively improved, and in terms of the whole vehicle, it is manifested as an improvement in the low-temperature power performance experience and the whole vehicle endurance.

[0070] Through the active heat preservation function, the working consistency of the single cells is improved, which can improve and enhance the cycle ability of the battery during charging and discharging in a low-temperature environment and extend the battery service life.

[0071] To make the purpose, technical solution, and advantages of this application clearer, the technical solutions in this application will be described clearly and completely below. In some embodiments, please refer to Figure 7 , Figure 7 For the specific implementation flowchart of the battery heat preservation method, the battery heat preservation method specifically includes the following steps:

[0072] S201: Under low-temperature conditions, obtain battery parameters such as the maximum temperature, minimum temperature, SOC, and ambient temperature of the battery through the BMS (Battery Management System);

[0073] S202: Judge the adhesion situation of the thermal insulation relay by the current of the thermal insulation circuit: close the main positive relay, do not close the thermal insulation relay, and confirm the magnitude of the current. If the current value exceeds the threshold, it is considered that the thermal insulation relay is adhered, and the BMS reports to contact the maintenance. If the current value is within the set range, it is judged that the relay is normal, and the thermal insulation process continues;

[0074] S203: Judge whether it meets the condition for entering thermal insulation based on the estimated SOC of the battery. A certain SOC value (such as 15%) can be set to ensure that the battery has enough power for the battery thermal insulation function;

[0075] S204: Judge the entire temperature difference distribution of the battery pack, and confirm whether the temperature difference between the maximum temperature and the minimum temperature of the battery meets the thermal insulation activation condition. For example, set the ambient temperature to T °C, BattTemp_min ≥ T + 5 °C, ΔT ∈ [4 °C, 7 °C]. That is, when the battery ambient temperature and the battery minimum temperature meet the requirements, when the battery temperature difference is higher than 4 °C and lower than 7 °C, the thermal insulation function is activated, and when the temperature difference is lower than 4 °C, the thermal insulation function is deactivated;

[0076] S205: If it is judged that the thermal insulation condition is met, the BMS drives the corresponding relay to close, activates the battery thermal insulation function, and continuously monitors the SOC judgment and temperature difference judgment after starting the thermal insulation relay for thermal insulation until any one of the conditions is not met, then the thermal insulation function is deactivated.

[0077] This application provides an electronic device, which includes a memory and a processor. The memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the method in any one of the foregoing optional implementation manners.

[0078] This application provides a readable storage medium, in which computer program instructions are stored. When the computer program instructions are read and run by a processor, the method in any one of the foregoing optional implementation manners is executed.

[0079] Among them, the storage medium can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0080] In several embodiments provided in the present application, it should be understood that the disclosed device and method can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of the device, method, and computer program product according to multiple embodiments of the present application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order from that marked in the accompanying drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0081] In addition, the functional modules in each embodiment of the present application can be integrated together to form an independent part, or each module can exist alone, or two or more modules can be integrated to form an independent part.

[0082] When the above-mentioned functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of this application, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The foregoing storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs.

[0083] The above are only the embodiments of this application and are not used to limit the protection scope of this application. For those skilled in the art, this application can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of this application shall be included in the protection scope of this application. It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0084] The above is only the specific implementation manner of this application, but the protection scope of this application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in this application, and all should be covered by the protection scope of this application. Therefore, the protection scope of this application should be subject to the protection scope of the claims.

[0085] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitations, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

Claims

1. A battery thermal insulation device, characterized in that, The device includes: A thermal insulation circuit, which is arranged in the main high-voltage circuit of the battery. Its first end is connected to the main positive relay of the main high-voltage circuit of the battery, and its second end is connected to the total negative of the main high-voltage circuit of the battery. It includes at least one heating element, which is arranged on the battery crossbeam and close to the side of the battery end plate, and is used to turn on the thermal insulation circuit to heat the end of the battery module after the thermal insulation condition is met.

2. The battery thermal insulation device according to claim 1, characterized in that, The heating element includes: A first heating film and a second heating film, which are fixed on the battery crossbeam through a heat-conducting fixing part.

3. The battery thermal insulation device according to any one of claim 2, characterized in that, The thermal insulation circuit further includes: A thermal insulation relay, which is connected in series with the first heating film and the second heating film and is communicatively connected to the battery management system. It is used to close the thermal insulation relay after the thermal insulation condition is met, so as to heat the end of the battery module through the first heating film and the second heating film.

4. A battery heat preservation method, characterized in that, Applied to the battery thermal insulation device according to any one of claims 1-3, the method includes: Obtaining battery parameters; Judging whether the thermal insulation relay is stuck; If it is not stuck, judge the thermal insulation condition based on the battery parameters; If the thermal insulation condition is met, start the thermal insulation circuit to insulate the battery.

5. The battery heat preservation method according to claim 4, characterized in that, The judging whether the thermal insulation relay is stuck includes: Closing the main positive relay but not closing the thermal insulation relay, and obtaining the current of the thermal insulation circuit; If the current is within the set threshold range, the thermal insulation relay is normal.

6. The battery thermal insulation method according to claim 4, wherein The battery parameters include the state of charge, the highest temperature of the battery, the lowest temperature of the battery and the ambient temperature. The judging the thermal insulation condition based on the battery parameters includes: Judging whether the battery meets the thermal insulation condition based on the state of charge, the highest temperature of the battery, the lowest temperature of the battery and the ambient temperature.

7. The battery thermal insulation method according to claim 6, wherein, The judging whether the battery meets the thermal insulation condition based on the state of charge, the highest temperature of the battery, the lowest temperature of the battery and the ambient temperature includes: Judging whether the state of charge meets the thermal insulation condition; If it is met, judge whether the battery temperature difference meets the thermal insulation condition based on the ambient temperature, where the battery temperature difference is the difference between the highest temperature and the lowest temperature of the battery.

8. The battery thermal insulation method according to claim 7, wherein The judging whether the battery temperature difference meets the thermal insulation condition based on the ambient temperature includes: If the ambient temperature is within the first temperature threshold range, the difference between the lowest temperature of the battery and the ambient temperature is greater than the second temperature threshold, and the battery temperature difference is within the temperature difference threshold range, then the thermal insulation condition is met.

9. An electronic device, characterized in that, The electronic device includes a memory and a processor. The memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the battery thermal insulation method according to any one of claims 4 to 8.

10. A readable storage medium, characterized in that, Computer program instructions are stored in the readable storage medium. When the computer program instructions are read and run by a processor, the battery thermal insulation method according to any one of claims 4 to 8 is executed.

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