Temperature control system, method and device for battery pack, storage medium, and vehicle

Abstract

The present invention relates to the technical field of new energy vehicles. Disclosed are a temperature control system, method and device for a battery pack, a storage medium, and a vehicle. The temperature control system comprises a temperature control component, and the battery pack comprises two battery modules. When an abnormal temperature fault occurs in one of the battery modules, power is supplied by means of the other battery module, and the battery pack is cooled by means of the temperature control component.

Description

Temperature control system, method, apparatus, storage medium and vehicle for battery pack

[0001] Priority information

[0002] This application is based on and claims priority to Chinese Patent Application No. 2024111998903, filed on August 29, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application belongs to the field of new energy vehicle technology, and in particular relates to a temperature control system, method, device, storage medium and vehicle for a battery pack. Background Technology

[0004] Currently, facing environmental pollution and energy shortages, countries worldwide are vigorously promoting the development and application of clean energy. Electricity, as a relatively clean secondary energy source, is gradually replacing traditional fossil fuels in energy storage, transportation, and other areas. Among these, lithium-ion batteries are widely used in electric vehicles due to their high specific energy and long cycle life. However, the complexity of their operating conditions and the frequent fires in electric vehicles have become a bottleneck for the continued development of lithium-ion power batteries.

[0005] Battery packs, typically located at the bottom of vehicles, consist of hundreds or even thousands of individual battery cells. In the event of thermal runaway, they release a large amount of heat and smoke, potentially causing a fire or even an explosion, endangering user safety. Therefore, handling thermal runaway is a critical issue that urgently needs to be addressed. Currently, electric vehicles on the market can only passively await fire and rescue when a battery cell experiences thermal runaway; there are no proactive measures to address it. Summary of the Invention

[0006] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a temperature control system, method, apparatus, storage medium, and vehicle for a battery pack, which can quickly cool the battery pack, thereby preventing thermal runaway before individual battery cells experience thermal runaway and preventing the spread of thermal runaway after it occurs.

[0007] In a first aspect, this application provides a temperature control system for a battery pack, including a temperature control component. The battery pack includes two battery cells, wherein:

[0008] When one of the battery packs experiences a temperature abnormality fault, power is supplied through the other battery pack, and the temperature control component cools down the battery pack.

[0009] In some embodiments, the temperature control system further includes a battery management controller, the battery management controller being configured to:

[0010] When one of the battery packs experiences an abnormal temperature fault, the circuit containing the faulty battery pack in the battery pack discharge circuit is disconnected, and the circuit containing the other battery pack is closed.

[0011] In some embodiments, the battery pack discharge circuit includes the battery pack, a load, a first relay, a second relay, a third relay, and a fourth relay. The two battery packs are connected in series, and the positive terminal of one battery pack is connected to a first terminal of the load via the first relay, while the negative terminal of the other battery pack is connected to a second terminal of the load via the second relay. The connection point between the two battery packs is connected to the first terminal via the third relay and to the second terminal via the fourth relay.

[0012] The battery management controller is specifically used for:

[0013] When one of the battery packs experiences an abnormal temperature fault, the circuit containing the faulty battery pack in the battery pack discharge circuit is disconnected by controlling the opening and closing states of the first relay, the second relay, the third relay, and the fourth relay, and the circuit containing the other battery pack in the battery pack discharge circuit is closed.

[0014] In some embodiments, the two battery packs are a first battery pack and a second battery pack, the positive terminal of the first battery pack is connected to the first relay, and the negative terminal of the second battery pack is connected to the second relay. The battery management controller is specifically used for:

[0015] When the first battery pack experiences an abnormal temperature fault, the first relay and the fourth relay are controlled to be in the open state, and the second relay and the third relay are controlled to be in the closed state.

[0016] When the second battery pack experiences an abnormal temperature fault, the second and third relays are controlled to be in the open state, and the first and fourth relays are controlled to be in the closed state.

[0017] In some embodiments, the control system further includes a thermal management controller, which is connected to the temperature control component and is used for:

[0018] When one of the battery packs experiences a temperature abnormality fault, the temperature control component is controlled to cool down the battery pack.

[0019] In some embodiments, the thermal management controller is used to:

[0020] When one of the battery packs experiences a temperature abnormality fault, the temperature control component is controlled to cool down the faulty battery pack in the battery pack.

[0021] In some embodiments, the temperature control assembly includes a refrigerant circulation assembly, which includes a compressor, a condenser, a fan, a first expansion valve, and a first heat exchanger. The first heat exchanger is disposed near the battery pack, the fan is disposed near the condenser, the outlet of the compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the first expansion valve, the outlet of the first expansion valve is connected to the inlet of the first heat exchanger, and the outlet of the first heat exchanger is connected to the inlet of the compressor.

[0022] The thermal management controller is specifically used for:

[0023] When one of the battery packs experiences a temperature abnormality fault, the compressor, the first expansion valve, and the fan are activated to cool the battery pack.

[0024] In some embodiments, the temperature control assembly includes a coolant circulation assembly, which includes a water tank, a second water pump, a first heat exchanger, and a second heat exchanger. The first heat exchanger is disposed close to the battery pack. The inlet of the second water pump is connected to the water tank, the outlet of the second water pump is connected to the inlet of the second heat exchanger, the outlet of the second heat exchanger is connected to the inlet of the first heat exchanger, and the outlet of the first heat exchanger is connected to the water tank.

[0025] The thermal management controller is specifically used for:

[0026] When one of the battery packs experiences a temperature anomaly, the second water pump is activated to cool the battery pack.

[0027] Secondly, this application provides a temperature control method applied to the temperature control system of the battery pack described in any of the above claims, the temperature control method comprising:

[0028] When one of the battery packs experiences a temperature abnormality fault, the other battery pack is controlled to supply power, and the temperature control component is controlled to cool down the battery pack.

[0029] Thirdly, this application provides a temperature control device, including 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 temperature control method described above.

[0030] Fourthly, this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the temperature control method described in any of the preceding claims.

[0031] Fifthly, this application provides a vehicle that includes a temperature control system for the battery pack described in any of the preceding claims.

[0032] Sixthly, this application provides a computer program product, including a computer program that, when executed by a processor, implements the temperature control method described in any of the preceding claims.

[0033] The battery pack temperature control system, method, apparatus, storage medium, vehicle, and computer program product provided in this application embodiment include a battery pack comprising two battery groups. By setting a temperature control component, when one battery group experiences an abnormal temperature fault, the other battery group provides power and the temperature control component cools down the battery pack. In other words, the normal operation of the temperature control component is maintained by the battery group that has not experienced a fault, thereby cooling down the battery pack. This can prevent thermal runaway before the individual battery cells experience thermal runaway and prevent the spread of thermal runaway after it occurs. Attached Figure Description

[0034] To more clearly illustrate the technical solution of the present invention, the accompanying drawings used in the description of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 is a schematic diagram of the frame structure of a temperature control system for a battery pack provided in an embodiment of this application;

[0036] Figure 2 is a schematic diagram of a battery pack discharge circuit provided in an embodiment of this application;

[0037] Figure 3 is a schematic diagram of a battery pack circuit provided in an embodiment of this application;

[0038] Figure 4 is a schematic diagram of the circulation loop of a coolant circulation assembly and a refrigerant circulation assembly provided in an embodiment of this application.

[0039] Explanation of reference numerals in the attached diagram: 10-Battery pack temperature control system, 11-Temperature control component, 12-Battery management controller, 13-Thermal management controller, 111-Coolant circulation component, 112-Refrigerant circulation component, b-Battery pack, b1-First battery pack, b2-Second battery pack, k1 to k8-First relay to eighth relay, c-Compressor, h-Heater, m1-Drive motor, m2-DC charging port, 1121-Condenser, 1122-Fan, 1123-First expansion valve, 1124-Evaporator, 1125-Blower, 1126-Second expansion valve, 1111-Water tank, 1112-Second water pump, 1113-First water pump, 1114-Heater core, 1115-Three-way valve, s1-First heat exchanger, s2-Second heat exchanger. Detailed Implementation

[0040] 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 are only used to explain this application, and should not be construed as limiting this application.

[0041] This application provides a temperature control system, method, apparatus, storage medium, vehicle, and computer program product for a battery pack.

[0042] Please refer to Figure 1, which is a schematic diagram of the framework structure of a battery pack temperature control system 10 according to an embodiment of this application. The battery pack temperature control system 10 includes a temperature control component 11, and the battery pack includes two battery packs. When one battery pack experiences a temperature abnormality fault, power is supplied through the other battery pack, and the temperature control component 11 cools down the battery pack.

[0043] Specifically, the entire battery pack is divided into two series-connected battery modules (i.e., two half-packs). These two modules typically have identical structures, each consisting of hundreds or thousands of individual battery cells. Under normal power supply conditions, both modules simultaneously power the system (primarily including the various high-voltage systems within the system), serving as the power source for the entire vehicle. Abnormal battery pack temperatures are usually caused by abnormal temperatures in the individual battery cells. Improper charging, collisions, and overheating can all easily lead to abnormal cell temperatures. A Battery Management System (BMS) can monitor whether abnormal temperatures are occurring in the battery modules within the battery pack. The BMS is a crucial link between the battery pack and the vehicle. It collects, processes, and stores critical information during battery pack operation in real time, exchanges information with external devices such as the vehicle controller, and addresses key issues related to safety, availability, usability, and lifespan in lithium battery systems.

[0044] In some embodiments, referring to Figure 1, the temperature control system 10 of the battery pack further includes a battery management controller 12, which is used for:

[0045] When one of the battery packs experiences thermal runaway, the circuit containing the faulty battery pack in the battery pack discharge circuit is disconnected, and the circuit containing the other battery pack is closed.

[0046] The BMS includes the aforementioned Battery Management Controller 12. The Battery Management Controller 12 can determine whether a temperature anomaly has occurred in a battery pack by analyzing whether the temperature data collected by the temperature sensors in the battery pack exceeds a threshold. For example, if the collected temperature data exceeds the threshold, it is determined that a temperature anomaly has occurred in the battery pack. At this time, some individual cells in the battery pack may be about to experience thermal runaway or have already experienced thermal runaway. The Battery Management Controller 12 can also control each circuit in the battery pack discharge circuit to achieve discharge control of the battery pack, such as partial discharge, full discharge, and system power failure. For example, when the battery pack is in normal operation, the Battery Management Controller 12 controls the battery pack discharge circuit to perform full discharge; when a temperature anomaly occurs in a battery cell within the battery pack, the Battery Management Controller 12 controls the battery pack discharge circuit to perform partial discharge.

[0047] In some embodiments, please refer to Figures 1 and 2. Figure 2 is a schematic diagram of the battery pack discharge circuit provided in this embodiment. The battery pack discharge circuit includes a battery pack b, a load, a first relay k1, a second relay k2, a third relay k3, and a fourth relay k4. The positive terminal of one battery pack (i.e., b1) is connected to the first terminal of the load via the first relay k1, and the negative terminal of the other battery pack (i.e., b2) is connected to the second terminal of the load via the second relay k2. The connection point between the two battery packs (i.e., b1 and b2) is connected to the first terminal via the third relay k3 and to the second terminal via the fourth relay k4. The battery management controller 12 is specifically used for:

[0048] When one of the battery packs experiences an abnormal temperature fault, the circuit containing the faulty battery pack in the battery pack discharge circuit is disconnected and the circuit containing the other battery pack is closed by controlling the opening and closing states of the first relay k1, the second relay k2, the third relay k3 and the fourth relay k4.

[0049] The battery pack discharge circuit is mainly used to power the load from battery pack b. The load mainly includes high-voltage loads, such as heater h and compressor c in Figure 2, as well as other high-voltage devices (not shown in the figure). These loads can be connected in parallel to the battery pack discharge circuit. The battery management controller 12 can control the battery pack discharge circuit to power the loads of two battery packs or a single battery pack.

[0050] For example, when battery pack b is in normal power supply state, battery management controller 12 controls the first relay k1 and the second relay k2 to be in closed state, and the third relay k3 and the fourth relay k4 to be in open state, so that a series closed loop is formed between battery pack b and parallel load, so that the two battery packs can supply power to the parallel load at the same time.

[0051] For example, when a battery pack experiences an abnormal temperature fault, if the two battery packs are a first battery pack b1 and a second battery pack b2, the positive terminal of the first battery pack b1 is connected to the first relay k1, and the negative terminal of the second battery pack b2 is connected to the second relay k2. In this case, the battery management controller 12 is specifically used for:

[0052] When the first battery pack b1 experiences an abnormal temperature fault, the first relay k1 and the fourth relay k4 are controlled to be in the open state, and the second relay k2 and the third relay k3 are controlled to be in the closed state.

[0053] When the second battery pack b2 experiences an abnormal temperature fault, the second relay k2 and the third relay k3 are controlled to be in the open state, and the first relay k1 and the fourth relay k4 are controlled to be in the closed state.

[0054] That is, if the first battery pack b1 experiences a temperature abnormality fault, it will be disconnected, and a closed series circuit will be formed between the second battery pack b2 and the load. At this time, the current will be output from the positive terminal of the second battery pack b2 and will flow sequentially through the third relay k3, the load, the second relay k2, and the negative terminal of the second battery pack b2. If the second battery pack b2 experiences a temperature abnormality fault, it will be disconnected, and a closed series circuit will be formed between the first battery pack b1 and the load. At this time, the current will be output from the positive terminal of the first battery pack b1 and will flow sequentially through the first relay k1, the load, the fourth relay k4, and the negative terminal of the first battery pack b1.

[0055] This circuit control method enables the circuit breaking and shielding of faulty battery packs, as well as the independent power supply of normal battery packs, ensuring that each high-voltage system and load will not be powered off, thereby ensuring the reliable operation of the temperature control component 11 when the temperature of a single battery pack is abnormal.

[0056] In addition to the battery pack discharge circuit, the system also includes a battery pack charging circuit for charging the battery pack b from an external power source. Please refer to Figure 3, which is a schematic diagram of a battery pack circuit provided in an embodiment of this application. The battery pack circuit includes the aforementioned battery pack discharge circuit and a battery pack charging circuit coupled to the battery pack discharge circuit. The battery pack charging circuit includes the battery pack b, fifth relays k5 to eighth relays k8, a DC charging port m2, and a drive motor m1. The drive motor m1 is mainly used to boost the charging voltage of the battery pack b, and the DC charging port m2 is used to connect to an external power source to provide charging power to the battery pack b. The battery management controller 12 can control the closing and opening of k1 to k8 to achieve half-pack charging, full-pack charging, and boost charging of the battery pack b.

[0057] In some embodiments, please continue to refer to FIG1, the temperature control system 10 of the battery pack further includes a thermal management controller 13, which is connected to the temperature control component 11 and is used to: control the temperature control component 11 to cool down the battery pack b when one of the battery packs experiences a temperature abnormality fault.

[0058] Furthermore, cooling the battery pack b mainly involves cooling the faulty battery pack. That is, the thermal management controller 13 is used to control the temperature control component 11 to cool the faulty battery pack when one of the battery packs experiences an abnormal temperature fault.

[0059] The thermal management controller 13 is connected to the battery management controller 12. When the BMS detects an abnormal temperature fault in a battery pack, the battery management controller 12 can generate a corresponding fault signal and send it to the thermal management controller 13. The thermal management controller 13 can then control the temperature control component 11 to cool down the faulty battery pack according to the fault signal, so as to achieve rapid cooling of the faulty battery pack as much as possible. This can prevent thermal runaway before the individual cells of the faulty battery pack become thermally runaway and prevent the spread of thermal runaway after it occurs.

[0060] Specifically, please refer to Figures 1 and 4. Figure 4 is a schematic diagram of the circulation loop of the coolant circulation assembly 111 and the refrigerant circulation assembly 112 provided in this embodiment. The temperature control assembly 11 includes the coolant circulation assembly 111 and / or the refrigerant circulation assembly 112. The coolant circulation assembly 111 is used to transfer heat through the circulation of coolant, and the refrigerant circulation assembly 112 is used to transfer heat through the phase change of refrigerant. The coolant circulation assembly 111 constitutes the coolant circulation loop, and the refrigerant circulation assembly 112 constitutes the refrigerant circulation loop. The coolant circulation assembly 111 can heat up the vehicle interior space and / or the battery pack b, and can also cool down the battery pack b. The refrigerant circulation assembly 112 can cool down the vehicle interior space and / or the battery pack b.

[0061] The temperature control component 11 includes a refrigerant circulation component 112, which includes a compressor c, a condenser 1121, a fan 1122, a first expansion valve 1123, and a first heat exchanger s1. The first heat exchanger s1 is located near the battery pack b, and the fan 1122 is located near the condenser 1121. The outlet of the compressor c is connected to the inlet of the condenser 1121, the outlet of the condenser 1121 is connected to the inlet of the first expansion valve 1123, the outlet of the first expansion valve 1123 is connected to the inlet of the first heat exchanger s1, and the outlet of the first heat exchanger s1 is connected to the inlet of the compressor c. The thermal management controller 13 is specifically used to: when one of the battery packs experiences a temperature abnormality fault, activate the compressor c, the first expansion valve 1123, and the fan 1122 to cool down the battery pack b.

[0062] The compressor (C) is primarily used to compress the refrigerant from a low-temperature, high-pressure state to a high-temperature, high-pressure state. The condenser 1121 converts the gaseous or vaporous refrigerant into a liquid, and uses a fan 1122 to quickly transfer the heat generated during the phase change process into the air; its operation is an exothermic process. The first expansion valve 1123 mainly utilizes the expansion characteristics of the refrigerant to control the refrigerant flow rate, thereby controlling the outlet temperature of the condenser 1121. The first heat exchanger s1 is a plate heat exchanger responsible for heat exchange.

[0063] When a battery pack experiences an abnormal temperature fault, the compressor c, condenser 1121, fan 1122, first expansion valve 1123, and first heat exchanger s1 form a cooling circuit for battery pack b (i.e., the dashed circuit ① in Figure 4). The thermal management controller 13 can activate the compressor c, first expansion valve 1123, and fan 1122 to their maximum settings to achieve the fastest cooling effect. During the cooling process of battery pack b, the compressor c compresses the low-temperature, low-pressure refrigerant gas into a high-temperature, high-pressure state, which is then transferred to the first expansion valve 1123 via the condenser 1121 and released into the inlet of the first heat exchanger s1 via the first expansion valve 1123 to exchange heat with battery pack b. Finally, the refrigerant returns from the outlet of the first heat exchanger s1 to the inlet of the compressor c. During this process, the state of the refrigerant changes, and it absorbs a large amount of heat from battery pack b, effectively cooling the battery pack b.

[0064] In some embodiments, the refrigerant circulation assembly 112, in addition to cooling the battery pack b, also has the function of cooling the passenger compartment in the vehicle. Referring to Figures 1 and 4, the refrigerant circulation assembly 112 further includes an evaporator 1124, a blower 1125, and a second expansion valve 1126. The blower 1125 is located close to the evaporator 1124. The inlet of the second expansion valve 1126 is connected to the outlet of the condenser 1121, the outlet of the second expansion valve 1126 is connected to the inlet of the evaporator 1124, and the outlet of the evaporator 1124 is connected to the inlet of the compressor c.

[0065] When cooling of the passenger compartment is required, the compressor c, condenser 1121, second expansion valve 1126, and evaporator 1124 constitute a cooling circuit for the passenger compartment (i.e., the dashed circuit ② in Figure 4). When the air conditioner is turned on, the compressor c operates first. The compressor c draws in low-temperature, low-pressure refrigerant and compresses it into a high-temperature, high-pressure gas, which is then sent to the condenser 1121. In the condenser 1121, the high-temperature, high-pressure refrigerant dissipates heat, becoming a high-temperature, high-pressure refrigerant liquid, and exchanges heat with the outdoor air, transferring heat to the outside. Next, the refrigerant is transferred to the second expansion valve 1126, and released into the evaporator 1124, becoming a low-temperature, low-pressure refrigerant. At this point, the refrigerant exchanges heat with the air in the evaporator 1124, absorbing heat from the room and becoming low-temperature, low-pressure refrigerant vapor, thus cooling the passenger compartment. Finally, the refrigerant returns from the outlet of the evaporator 1124 to the inlet of the compressor c, forming a refrigeration cycle.

[0066] When a battery pack experiences an abnormal temperature fault and the cooling rate of the faulty battery pack needs to be increased as quickly as possible, the thermal management controller 13 can shut down the cooling circuit for the passenger compartment. That is, the thermal management controller 13 is also used to: shut down the second expansion valve 1126 and the blower 1125 (that is, shut down the dashed circuit ② in Figure 4) when one of the battery packs experiences an abnormal temperature fault, so that the refrigerant does not flow through the evaporator 1124 for diversion, but all of it enters the first heat exchanger s1 through the first expansion valve 1123 to cool down the battery pack b (that is, the dashed circuit ① in Figure 4), thereby increasing the cooling rate of the battery pack b and improving the cooling effect.

[0067] In some embodiments, referring to Figures 1 and 4, the temperature control assembly 11 includes a coolant circulation assembly 111, which includes a water tank 1111, a second water pump 1112, a first heat exchanger s1, and a second heat exchanger s2. The first heat exchanger s1 is located close to the battery pack b. The inlet of the second water pump 1112 is connected to the water tank 1111, the outlet of the second water pump 1112 is connected to the inlet of the second heat exchanger s2, the outlet of the second heat exchanger s2 is connected to the inlet of the first heat exchanger s1, and the outlet of the first heat exchanger s1 is connected to the water tank 1111. The thermal management controller 13 is specifically used to: activate the second water pump 1112 to cool down the battery pack b when one of the battery packs experiences a temperature abnormality fault.

[0068] The water tank 1111 stores coolant, and the second water pump 1112 provides power to circulate the coolant. Both the first heat exchanger s1 and the second heat exchanger s2 are plate heat exchangers. When a battery pack experiences a temperature anomaly, the water tank 1111, the second water pump 1112, the first heat exchanger s1, and the second heat exchanger s2 form a water-cooling circuit for battery pack b (i.e., the dashed circuit ③ in Figure 4). The thermal management controller 13 can activate the second water pump 1112 to its maximum setting, causing the coolant to flow rapidly in the water-cooling circuit, thereby increasing the cooling rate of battery pack b.

[0069] In addition to cooling the battery pack b, the aforementioned coolant circulation assembly 111 also has the function of heating the passenger compartment and the battery pack b. Referring to Figure 4, the coolant circulation assembly 111 further includes a heater h, a first water pump 1113, a heater core 1114, and a three-way valve 1115. The inlet of the first water pump 1113 is connected to the water tank 1111, the outlet of the first water pump 1113 is connected to the inlet of the heater h, the outlet of the heater h is connected to one port of the three-way valve 1115, and the other two ports of the three-way valve 1115 are respectively connected to the inlet of the heater core 1114 and the inlet of the second heat exchanger s2. The outlet of the second heat exchanger s2 is connected to the outlet of the heater core 1114 and the water tank 1111.

[0070] The heater h is a positive temperature coefficient (PTC) thermistor used to heat the coolant. The first water pump 1113 provides power to circulate the coolant. The heater core 1114 transfers heat from the coolant to the air. When the passenger compartment needs to be heated, the thermal management controller 13 starts the first water pump 1113, heater h, and blower 1125. The heater h, heater core 1114, water tank 1111, and first water pump 1113 form a heating circuit for the passenger compartment (i.e., the dashed circuit ④ in Figure 4). The coolant is heated by the heater h, and the heated coolant flows into the heater core 1114 through the three-way valve 1115 and finally returns to the water tank 1111. During this process, the blower 1125 rapidly diffuses the heat from the heater core 1114 to the passenger compartment, thus heating the passenger compartment. When it is necessary to heat up the battery pack b, the thermal management controller 13 starts the first water pump 1113 and the heater h. The heater h, the first water pump 1113, the water tank 1111 and the second heat exchanger s2 constitute a heating circuit for the battery pack b (i.e., the dashed circuit ⑤ in Figure 4). The heater h heats the coolant, and the heated coolant flows into the second heat exchanger s2 through the three-way valve 1115 and finally returns to the water tank 1111. During this process, heat transfer occurs between the second heat exchanger s2 and the first heat exchanger s1, transferring the heat generated by the PTC to the battery pack b, thereby heating up the battery pack b.

[0071] When a battery pack experiences thermal runaway, the thermal management controller 13 needs to disconnect the heating circuit for the passenger compartment and battery pack b (that is, disconnect the dashed circuits ④ and ⑤ in Figure 4). In other words, the thermal management controller 13 is also used to: shut down the heater h and the first water pump 1113 when one of the battery packs experiences an abnormal temperature fault, so that all the coolant is used to cool down the battery pack b and accelerate the cooling rate of the battery pack b.

[0072] It should be noted that, regarding the unique dual-pack structure of battery pack b, this embodiment improves the control program of the battery pack discharge circuit so that when one battery pack in battery pack b experiences a temperature abnormality fault, the other battery pack supplies power to the relevant cooling components instead of directly cutting off the system power. At the same time, the cooling process is improved to maximize the utilization of the relevant cooling components. This allows for rapid cooling of the faulty battery pack before it smokes or catches fire, reducing its temperature to a normal level and preventing the risk of thermal runaway from the source. Furthermore, it eliminates the need for structural modifications to the existing vehicle's battery structure, motor, and motor controller, maximizing compatibility with existing automotive structures and offering broad market application prospects.

[0073] As can be seen from the above, the battery pack temperature control system 10 provided in this application embodiment includes two battery packs b. By setting a temperature control component 11, when one of the battery packs experiences an abnormal temperature fault, the other battery pack provides power to the system and cools down the battery pack b through the temperature control component 11. That is, the normal operation of the temperature control component 11 is maintained by the battery pack that has not failed, thereby cooling down the battery pack b. This can prevent thermal runaway before the individual battery cells experience thermal runaway and prevent the spread of thermal runaway after it occurs. Moreover, it does not require major modifications to the existing structure of the vehicle, has good compatibility, and is highly practical.

[0074] Based on the temperature control system of the battery pack described in the above embodiments, this application also provides a temperature control method, applied to the temperature control system of any of the above-described battery packs. The temperature control method includes:

[0075] When one of the battery packs experiences an abnormal temperature fault, it controls the other battery pack to supply power and controls the temperature control component to cool down the battery pack.

[0076] The specific details of each module unit involved in the temperature control method have been described in detail in the above-mentioned embodiment of the temperature control system for the battery pack, and will not be repeated here.

[0077] Based on the temperature control system of the battery pack described in the above embodiments, this application also provides a vehicle that includes the temperature control system of the battery pack provided in any of the above embodiments, which will not be repeated here.

[0078] This application also provides a temperature control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the various processes of the above-described temperature control method embodiments and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0079] This application also provides a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, it implements the various processes of the above-described temperature control method embodiments and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0080] The processor is the processor in the vehicle described in the above embodiments. The readable storage medium includes computer-readable storage media, such as computer read-only memory (ROM), random access memory (RAM), magnetic disk, or optical disk.

[0081] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the various processes of the above-described temperature control method embodiments and achieves the same technical effect. To avoid repetition, it will not be described again here.

[0082] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0083] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of this application.

[0084] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

[0085] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0086] In the description of this application, "multiple" means two or more.

[0087] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "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.

[0088] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A temperature control system for a battery pack, comprising a temperature control component, wherein the battery pack includes two battery groups, wherein: When one of the battery packs experiences a temperature abnormality fault, power is supplied through the other battery pack, and the temperature control component cools down the battery pack.

2. The temperature control system for the battery pack according to claim 1, wherein, The temperature control system further includes a battery management controller, which is used for: When one of the battery packs experiences an abnormal temperature fault, the circuit containing the faulty battery pack in the battery pack discharge circuit is disconnected, and the circuit containing the other battery pack is closed.

3. The temperature control system for the battery pack according to claim 2, wherein, The battery pack discharge circuit includes the battery pack, a load, a first relay, a second relay, a third relay, and a fourth relay. The two battery packs are connected in series, and the positive terminal of one battery pack is connected to the first terminal of the load via the first relay, while the negative terminal of the other battery pack is connected to the second terminal of the load via the second relay. The connection point between the two battery packs is connected to the first terminal via the third relay and to the second terminal via the fourth relay. The battery management controller is specifically used for: When one of the battery packs experiences an abnormal temperature fault, the circuit containing the faulty battery pack in the battery pack discharge circuit is disconnected by controlling the opening and closing states of the first relay, the second relay, the third relay, and the fourth relay, and the circuit containing the other battery pack in the battery pack discharge circuit is closed.

4. The temperature control system for the battery pack according to claim 3, wherein, The two battery packs are a first battery pack and a second battery pack. The positive terminal of the first battery pack is connected to the first relay, and the negative terminal of the second battery pack is connected to the second relay. The battery management controller is specifically used for: When the first battery pack experiences an abnormal temperature fault, the first relay and the fourth relay are controlled to be in the open state, and the second relay and the third relay are controlled to be in the closed state. When the second battery pack experiences an abnormal temperature fault, the second and third relays are controlled to be in the open state, and the first and fourth relays are controlled to be in the closed state.

5. The temperature control system for the battery pack according to any one of claims 1-4, wherein, The control system further includes a thermal management controller, which is connected to the temperature control component and is used for: When one of the battery packs experiences a temperature abnormality fault, the temperature control component is controlled to cool down the battery pack.

6. The temperature control system for the battery pack according to claim 5, wherein, The thermal controller is used for: When one of the battery packs experiences a temperature abnormality fault, the temperature control component is controlled to cool down the faulty battery pack in the battery pack.

7. The temperature control system for the battery pack according to claim 5 or 6, wherein, The temperature control component includes a refrigerant circulation component, which includes a compressor, a condenser, a fan, a first expansion valve, and a first heat exchanger. The first heat exchanger is located near the battery pack, the fan is located near the condenser, the outlet of the compressor is connected to the inlet of the condenser, the outlet of the condenser is connected to the inlet of the first expansion valve, the outlet of the first expansion valve is connected to the inlet of the first heat exchanger, and the outlet of the first heat exchanger is connected to the inlet of the compressor. The thermal management controller is specifically used for: When one of the battery packs experiences a temperature abnormality fault, the compressor, the first expansion valve, and the fan are activated to cool the battery pack.

8. The temperature control system for the battery pack according to any one of claims 5-7, wherein, The temperature control component includes a coolant circulation component, which includes a water tank, a second water pump, a first heat exchanger, and a second heat exchanger. The first heat exchanger is located close to the battery pack. The inlet of the second water pump is connected to the water tank, the outlet of the second water pump is connected to the inlet of the second heat exchanger, the outlet of the second heat exchanger is connected to the inlet of the first heat exchanger, and the outlet of the first heat exchanger is connected to the water tank. The thermal management controller is specifically used for: When one of the battery packs experiences a temperature anomaly, the second water pump is activated to cool the battery pack.

9. A temperature control method applied to a temperature control system for a battery pack as described in any one of claims 1-8, the temperature control method comprising: When one of the battery packs experiences a temperature abnormality fault, the other battery pack is controlled to supply power, and the temperature control component is controlled to cool down the battery pack.

10. A temperature control device 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 temperature control method as claimed in claim 9.

11. A computer-readable storage medium having a computer program stored thereon, wherein, When the computer program is executed by the processor, it implements the temperature control method as described in claim 9.

12. A computer program product comprising a computer program, wherein, When the computer program is executed by the processor, it implements the temperature control method as described in claim 9.

13. A vehicle comprising a temperature control system for a battery pack as claimed in any one of claims 1-8.

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