Battery pack temperature control system, method, device, storage medium and vehicle

Abstract

The present invention discloses a temperature control system, method, device, storage medium and vehicle for a battery pack, belonging to the field of new energy vehicle technology. The temperature control system includes a temperature control component, and the battery pack includes two battery groups. When an abnormal temperature fault occurs in one of the battery groups, power is supplied by the other battery group, and the battery pack is cooled by the temperature control component, thereby preventing thermal runaway from occurring before the battery cell thermal runaway occurs, and preventing the thermal runaway from spreading after the thermal runaway occurs.

Description

Technical Field

[0001] The present 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 Art

[0002] Currently, facing environmental pollution and energy shortages, countries around the world are vigorously promoting the development and application of clean energy. Electricity, as a cleaner secondary energy source, is gradually replacing traditional fossil fuels in energy storage, transportation, and other areas. Lithium-ion batteries, owing to their high specific energy and long cycle life, are widely used in electric vehicles. However, due to the complexity of their operating conditions, frequent fire accidents in electric vehicles have become a bottleneck for the continued development of lithium-ion power batteries.

[0003] The power battery pack, typically located at the bottom of a vehicle, consists of hundreds or even thousands of individual cells. If thermal runaway occurs, it releases significant amounts of heat and smoke, potentially causing fires or even explosions, endangering user safety. Therefore, addressing thermal runaway is an urgent issue. However, current electric vehicles on the market can only passively await firefighters when a battery cell experiences thermal runaway, with no proactive measures to address the situation. Summary of the Invention

[0004] This application aims to solve at least one of the technical problems existing in the prior art. To this end, this application proposes a battery pack temperature control system, method, device, storage medium, and vehicle that can quickly cool the battery pack, thereby preventing thermal runaway before a battery cell experiences thermal runaway, and preventing the spread of thermal runaway after it occurs.

[0005] In a first aspect, the present application provides a temperature control system for a battery pack, including a temperature control component, wherein the battery pack includes two battery packs, wherein:

[0006] When an abnormal temperature failure occurs in one of the battery packs, power is supplied by the other battery pack, and the battery pack is cooled by the temperature control component.

[0007] In some embodiments, the temperature control system further includes a battery management controller, wherein the battery management controller is configured to:

[0008] When an abnormal temperature fault occurs in one of the battery packs, the circuit of the battery pack discharge circuit where the faulty battery pack is located is disconnected, and the circuit of the other battery pack where the faulty battery pack is located is closed.

[0009] 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 electrode of one of the battery packs is connected to the first end of the load via the first relay, and the negative electrode of the other battery pack is connected to the second end of the load via the second relay. The connection point between the two battery packs is connected to the first end via the third relay and to the second end via the fourth relay.

[0010] The battery management controller is specifically used for:

[0011] When an abnormal temperature fault occurs in one of the battery packs, the opening and closing states of the first relay, the second relay, the third relay and the fourth relay are controlled to disconnect the circuit of the battery pack discharge circuit where the faulty battery pack is located, and close the circuit of the other battery pack in the battery pack discharge circuit.

[0012] In some embodiments, the two battery packs are a first battery pack and a second battery pack, the positive electrode of the first battery pack is connected to the first relay, and the negative electrode of the second battery pack is connected to the second relay, and the battery management controller is specifically configured to:

[0013] When an abnormal temperature fault occurs in the first battery pack, the first relay and the fourth relay are controlled to be in an open state, and the second relay and the third relay are controlled to be in a closed state;

[0014] When an abnormal temperature fault occurs in the second battery pack, the second relay and the third relay are controlled to be in an open state, and the first relay and the fourth relay are controlled to be in a closed state.

[0015] In some embodiments, the control system further includes a thermal management controller connected to the temperature control component for:

[0016] When an abnormal temperature fault occurs in one of the battery packs, the temperature control component is controlled to cool the battery pack.

[0017] In some embodiments, the thermal management controller is configured to:

[0018] When an abnormal temperature fault occurs in one of the battery packs, the temperature control component is controlled to cool the faulty battery pack in the battery pack.

[0019] In some embodiments, the temperature control assembly includes a refrigerant cycle 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.

[0020] The thermal management controller is specifically used for:

[0021] When an abnormal temperature fault occurs in one of the battery packs, the compressor, the first expansion valve and the fan are started to cool the battery pack.

[0022] 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 near 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.

[0023] The thermal management controller is specifically used for:

[0024] When an abnormal temperature fault occurs in one of the battery packs, the second water pump is started to cool the battery pack.

[0025] In a second aspect, the present application provides a temperature control method, which is applied to the temperature control system of the battery pack described in any one of the above items, and the temperature control method includes:

[0026] When an abnormal temperature fault occurs in one of the battery packs, the other battery pack is controlled to supply power, and the temperature control component is controlled to cool the battery pack.

[0027] In a third aspect, the present application provides 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 implements any of the above-described temperature control methods when executing the program.

[0028] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements any of the above-mentioned temperature control methods when executed by a processor.

[0029] In a fifth aspect, the present application provides a vehicle comprising a temperature control system of a battery pack as described above.

[0030] In a sixth aspect, the present application provides a computer program product, comprising a computer program, which implements any of the above-mentioned temperature control methods when executed by a processor.

[0031] The embodiments of the present application provide a temperature control system, method, device, storage medium, vehicle and computer program product for a battery pack. The battery pack includes two battery groups. By setting a temperature control component, when one of the battery groups has an abnormal temperature fault, power is supplied by the other battery group, and the battery pack is cooled by the temperature control component. That is, the battery group that has not failed is used to maintain the normal operation of the temperature control component and cool the battery pack, thereby preventing thermal runaway from occurring before the battery cell thermal runaway occurs and preventing the thermal runaway from spreading after the thermal runaway occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the description of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0033] Figure 1 This is a schematic diagram of the framework structure of a temperature control system for a battery pack provided in an embodiment of the present application;

[0034] Figure 2 This is a schematic structural diagram of a battery pack discharge circuit provided in an embodiment of the present application;

[0035] Figure 3 This is a schematic structural diagram of a battery pack circuit provided in an embodiment of the present application;

[0036] Figure 4 This is a schematic diagram of a circulation loop of a coolant circulation component and a refrigerant circulation component provided in an embodiment of the present application.

[0037] Description of reference numerals:

[0038] 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 to eighth relays, 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 DESCRIPTION

[0039] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0040] Embodiments of the present application provide a battery pack temperature control system, method, device, storage medium, vehicle, and computer program product.

[0041] See Figure 1 , Figure 1 Figure 1 is a schematic diagram of the framework structure of a battery pack temperature control system 10 provided in an embodiment of the present application. The battery pack temperature control system 10 includes a temperature control component 11, and the battery pack includes two battery packs. When an abnormal temperature fault occurs in one battery pack, power is supplied by the other battery pack, and the temperature control component 11 cools the battery pack.

[0042] Specifically, the entire battery pack is divided into two battery packs connected in series (i.e., two half-packs). These two battery packs usually have the same structure, and each battery pack is composed of hundreds or thousands of battery cells. When the battery pack is in the normal power supply state, the two battery packs simultaneously supply power to the system (mainly including the various high-voltage systems in the system) and are the power source for the entire vehicle. Abnormal temperature failures in the battery pack are usually caused by abnormal temperatures of the battery cells in the battery pack. Improper charging, collisions, overheating and other problems can easily lead to abnormal temperatures of the battery cells. The Battery Management System (BMS) can be used to monitor whether the battery packs in the battery pack have abnormal temperature failures. The BMS is an important link between the battery pack and the vehicle. The BMS collects, processes, and stores important information during the operation of the battery pack in real time, exchanges information with external devices such as the vehicle controller, and solves key issues such as safety, availability, ease of use, and service life in the lithium battery system.

[0043] In some embodiments, see Figure 1 The temperature control system 10 of the battery pack further includes a battery management controller 12, which is used to:

[0044] When a thermal runaway fault occurs in one of the battery packs, the loop of the battery pack discharge circuit where the faulty battery pack is located is disconnected, and the loop where the other battery pack is located is closed.

[0045] Among them, the BMS includes the above-mentioned battery management controller 12. The battery management controller 12 can determine whether the corresponding battery pack has a temperature abnormality fault by analyzing whether the temperature data collected by the temperature sensor in the battery pack exceeds the threshold. For example, when the collected temperature data exceeds the threshold, it is determined that the battery pack has a temperature abnormality fault. At this time, some battery 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 achieving half-pack discharge, full pack discharge, system power off, etc. For example, when the battery pack is in normal operating state, the battery management controller 12 controls the battery pack discharge circuit to perform full pack discharge. When a battery pack in the battery pack has a temperature abnormality fault, the battery management controller 12 controls the battery pack discharge circuit to perform half pack discharge.

[0046] In some embodiments, see Figure 1 and Figure 2 , Figure 2This is a schematic diagram of the structure of a battery pack discharge circuit provided by an embodiment of the present application, wherein 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 electrode of one battery pack (i.e., b1) is connected to the first end of the load via the first relay k1, and the negative electrode of the other battery pack (i.e., b2) is connected to the second end 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 end via the third relay k3 and to the second end via the fourth relay k4. The battery management controller 12 is specifically configured to:

[0047] When an abnormal temperature fault occurs in one of the battery packs, the circuit where the faulty battery pack is located in the battery pack discharge circuit is disconnected and the circuit where the other battery pack is located 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.

[0048] Among them, the battery pack discharge circuit is mainly used to realize the power supply of battery pack b to the load. The load mainly includes high-voltage loads, such as Figure 2 The heater h, compressor c, and other high-voltage devices (not shown in the figure) 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.

[0049] For example, when battery pack b is in a normal power supply state, the battery management controller 12 controls the first relay k1 and the second relay k2 to be in a closed state, and the third relay k3 and the fourth relay k4 to be in an open state, thereby forming a series closed loop between battery pack b and the parallel load, enabling two battery packs to power the parallel load at the same time.

[0050] For example, when a battery pack has an abnormal temperature fault, if the two battery packs are a first battery pack b1 and a second battery pack b2, the positive electrode of the first battery pack b1 is connected to the first relay k1, and the negative electrode of the second battery pack b2 is connected to the second relay k2. In this case, the battery management controller 12 is specifically configured to:

[0051] When the first battery pack b1 has a temperature abnormality fault, the first relay k1 and the fourth relay k4 are controlled to be in an open state, and the second relay k2 and the third relay k3 are controlled to be in a closed state;

[0052] When an abnormal temperature fault occurs in the second battery pack b2, the second relay k2 and the third relay k3 are controlled to be in an open state, and the first relay k1 and the fourth relay k4 are controlled to be in a closed state.

[0053] That is, if a temperature abnormality occurs in the first battery pack b1, the first battery pack b1 is disconnected, and a closed series circuit is formed between the second battery pack b2 and the load. At this time, current is output from the positive electrode of the second battery pack b2 and flows sequentially through the third relay k3, the load, the second relay k2, and the negative electrode of the second battery pack b2. If a temperature abnormality occurs in the second battery pack b2, the second battery pack b2 is disconnected, and a closed series circuit is formed between the first battery pack b1 and the load. At this time, current is output from the positive electrode of the first battery pack b1 and flows sequentially through the first relay k1, the load, the fourth relay k4, and the negative electrode of the first battery pack b1.

[0054] This circuit control method can achieve circuit shielding of faulty battery packs and 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.

[0055] In addition to the battery pack discharge circuit, the system also includes a battery pack charging circuit, which is used to charge the battery pack b from an external power source. Figure 3 , Figure 3 The figure is a schematic diagram of the structure of a battery pack circuit provided in an embodiment of the present 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 battery pack b, fifth through eighth relays k5 through k8, a DC charging port m2, and a drive motor m1. Drive motor m1 is primarily used to boost the charging voltage of battery pack b. DC charging port m2 is used to connect to an external power source to provide charging power to battery pack b. The battery management controller 12 can achieve half-pack charging, full-pack charging, and boost charging of battery pack b by controlling the opening and closing of relays k1 through k8.

[0056] In some embodiments, see Figure 1 The temperature control system 10 of the battery pack also 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 the battery pack b when an abnormal temperature failure occurs in one of the battery packs.

[0057] Furthermore, cooling the battery pack b is mainly for 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 in the battery pack when an abnormal temperature fault occurs in one of the battery packs.

[0058] Among them, the thermal management controller 13 is connected to the battery management controller 12. When the BMS detects that a battery pack has an abnormal temperature fault, the battery management controller 12 can generate a corresponding fault signal and send it to the thermal management controller 13, so that the thermal management controller 13 can control the temperature control component 11 to cool the faulty battery pack according to the fault signal, so as to achieve rapid cooling of the faulty battery pack as much as possible, thereby preventing thermal runaway from occurring before the battery cells of the faulty battery pack have thermal runaway, and preventing the thermal runaway from spreading after thermal runaway occurs.

[0059] For details, please refer to Figure 1 and Figure 4 , Figure 4 It is a schematic diagram of the circulation loop of the coolant circulation component 111 and the refrigerant circulation component 112 provided in an embodiment of the present application. The temperature control component 11 includes a coolant circulation component 111 and / or a refrigerant circulation component 112, the coolant circulation component 111 is used to transfer heat through the circulation of the coolant, and the refrigerant circulation component 112 is used to transfer heat through the phase change of the refrigerant. The coolant circulation component 111 constitutes a circulation loop of the coolant, and the refrigerant circulation component 112 constitutes a circulation loop of the refrigerant. The coolant circulation component 111 can heat up the interior space of the vehicle and / or the battery pack b, and can also cool down the battery pack b, and the refrigerant circulation component 112 can cool down the interior space of the vehicle and / or the battery pack b.

[0060] The temperature control assembly 11 includes a refrigerant cycle assembly 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 configured to: when a temperature abnormality occurs in one of the battery packs, start the compressor c, the first expansion valve 1123, and the fan 1122 to cool the battery pack b.

[0061] The air conditioner 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 refrigerant gas or vapor into a liquid and uses the fan 1122 to quickly transfer the heat generated during the phase change to the air. This operation is an exothermic process. The first expansion valve 1123 primarily utilizes the refrigerant's expansion characteristics to control the refrigerant flow rate and thereby control the outlet temperature of the condenser 1121. The first heat exchanger s1 is a plate heat exchanger responsible for heat exchange.

[0062] When a battery pack has a temperature abnormality fault, the compressor c, the condenser 1121, the fan 1122, the first expansion valve 1123 and the first heat exchanger s1 form a cooling circuit for the battery pack b (ie Figure 4 (See dashed line loop ① in the figure). The thermal management controller 13 can activate the compressor c, first expansion valve 1123, and fan 1122 to their maximum setting to achieve the fastest cooling effect. During the cooling process of battery pack b, the low-temperature, low-pressure refrigerant gas is compressed into a high-temperature, high-pressure state by compressor c. This refrigerant is then transferred to the first expansion valve 1123 via condenser 1121 and released through first expansion valve 1123 to the inlet of the first heat exchanger s1, exchanging heat with battery pack b. Finally, it returns from the outlet of the first heat exchanger s1 to the inlet of compressor c. During this process, the refrigerant changes state and absorbs a large amount of heat from battery pack b, effectively cooling battery pack b.

[0063] In some embodiments, the refrigerant circulation assembly 112 not only cools the battery pack b, but also has the function of cooling the passenger compartment in the vehicle. Figure 1 and Figure 4 The refrigerant circulation component 112 also includes an evaporator 1124, a blower 1125 and a second expansion valve 1126. The blower 1125 is arranged 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.

[0064] When the passenger compartment needs to be cooled, the compressor c, the condenser 1121, the second expansion valve 1126 and the evaporator 1124 form a cooling circuit for the passenger compartment (ie Figure 4(See dotted line loop ② in the diagram). When the air conditioner is turned on, compressor C first operates, drawing in low-temperature, low-pressure refrigerant and compressing it into high-temperature, high-pressure gas. This gas is then sent to condenser 1121. In condenser 1121, the high-temperature, high-pressure refrigerant dissipates heat, transforming into a high-temperature, high-pressure refrigerant liquid. This liquid then exchanges heat with the outdoor air, transferring the heat to the outside. Next, the refrigerant passes through second expansion valve 1126 and is released into evaporator 1124, transforming into low-temperature, low-pressure refrigerant. Within evaporator 1124, the refrigerant exchanges heat with the air, absorbing heat from the interior of the room and transforming into low-temperature, low-pressure refrigerant vapor, cooling the passenger compartment. The refrigerant ultimately returns from the outlet of evaporator 1124 to the inlet of compressor C, completing the refrigeration cycle.

[0065] When a battery pack has an abnormal temperature fault and the cooling speed of the faulty battery pack needs to be increased as soon as possible, the thermal management controller 13 can close the cooling circuit for the passenger compartment. That is, the thermal management controller 13 is also used to: when a temperature abnormality fault occurs in one of the battery packs, close the second expansion valve 1126 and the blower 1125 (that is, close the cooling circuit). Figure 4 The dotted line loop ② in the middle is used to prevent the refrigerant from flowing through the evaporator 1124 for diversion, and all the refrigerant flows through the first expansion valve 1123 into the first heat exchanger s1 to cool the battery pack b (i.e. Figure 4 The middle dotted line loop ①) increases the cooling speed of the battery pack b and improves the cooling effect.

[0066] In some embodiments, see Figure 1 and Figure 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 near 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 configured to: when a temperature abnormality occurs in one of the battery packs, start the second water pump 1112 to cool the battery pack b.

[0067] The water tank 1111 is used to store the coolant, and the second water pump 1112 is used to provide power to circulate the coolant. The first heat exchanger s1 and the second heat exchanger s2 are both plate heat exchangers. When a battery pack has an abnormal temperature failure, 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 the battery pack b (i.e. Figure 4The thermal management controller 13 may turn on the second water pump 1112 to the maximum gear, so that the coolant flows quickly in the water cooling circuit to increase the cooling speed of the battery pack b.

[0068] In addition, the above-mentioned coolant circulation component 111 can not only cool down the battery pack b, but also heat up the passenger compartment and battery pack b. Figure 4 The coolant circulation component 111 also 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, and the outlet of the second heat exchanger s2 is connected to the outlet of the heater core 1114 and the water tank 1111.

[0069] The heater h is a positive temperature coefficient thermistor (PTC) heater used to heat the coolant. The first water pump 1113 is used to provide power to circulate the coolant. The heater core 1114 is used to transfer 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, the heater h, and the blower 1125. The heater h, the heater core 1114, the water tank 1111, and the first water pump 1113 form a heating circuit for the passenger compartment (i.e., 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 quickly diffuses the heat of the heater core 1114 to the passenger compartment, thereby heating the passenger compartment. When the battery pack b needs to be heated, 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 form a heating circuit for the battery pack b (i.e. Figure 4 In the dotted line loop ⑤ in FIG, the coolant is heated by the heater h, 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 is transferred between the second heat exchanger s2 and the first heat exchanger s1, and the heat generated by the PTC is transferred to the battery pack b, thereby increasing the temperature of the battery pack b.

[0070] 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 (i.e. disconnect the heating circuit for the passenger compartment and battery pack b). Figure 4The middle dotted line loops ④ and ⑤), that is, the thermal management controller 13 is also used to: when an abnormal temperature fault occurs in one of the battery packs, turn off the heater h and the first water pump 1113, so that all the coolant is used to cool the battery pack b, thereby accelerating the cooling speed of the battery pack b.

[0071] It should be pointed out that, in view of the special double-pack structure of battery pack b, the embodiment of the present application improves the control program of the battery pack discharge circuit so that when one of the battery packs in battery pack b has an abnormal temperature fault, the other battery pack is used to power the cooling-related components instead of directly cutting off the power to the system. At the same time, the cooling process is improved to maximize the utilization of the cooling-related components. On the one hand, before the faulty battery pack smokes or catches fire, the faulty battery pack can be quickly cooled and the temperature of the faulty battery pack can be reduced to a normal level, thereby preventing and stopping the risk of thermal runaway from spreading at the source. On the other hand, there is no need to make structural changes to the battery structure, motor and motor controller of existing vehicles, and it can be compatible with the existing structure of the car to the greatest extent, and has broad market application prospects.

[0072] From the above, it can be seen that the temperature control system 10 of the battery pack provided in the embodiment of the present application, the battery pack b includes two battery groups. By setting the temperature control component 11, when an abnormal temperature fault occurs in one of the battery packs, the system is powered by the other battery pack, and the battery pack b is cooled by the temperature control component 11. That is, the battery pack that has not failed is used to maintain the normal operation of the temperature control component 11 to cool the battery pack b, thereby preventing thermal runaway from occurring before the battery cell thermal runaway occurs, and preventing the thermal runaway from spreading after thermal runaway occurs, and there is no need to make major changes to the existing structure of the vehicle, with good compatibility and strong practicality.

[0073] Based on the temperature control system of the battery pack described in the above embodiments, the present application also provides a temperature control method, which is applied to any of the temperature control systems of the above battery packs. The temperature control method includes:

[0074] When an abnormal temperature fault occurs in one of the battery packs, the other battery pack is controlled to supply power, and the temperature control component is controlled to cool the battery pack.

[0075] Among them, the specific details of each module unit involved in the temperature control method have been described in detail in the above-mentioned battery pack temperature control system embodiment and will not be repeated here.

[0076] According to the temperature control system of the battery pack described in the above embodiments, an embodiment of the present application further provides a vehicle, including the temperature control system of the battery pack provided by any of the above embodiments, which will not be described in detail here.

[0077] An embodiment of the present application also provides a temperature control device, including a memory, a processor, and a computer program stored in the memory and runnable on the processor. When the processor executes the program, each process of the above-mentioned temperature control method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0078] An embodiment of the present application also provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor, the various processes of the above-mentioned temperature control method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0079] The processor is the processor in the vehicle in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0080] An embodiment of the present application also provides a computer program product, including a computer program. When the computer program is executed by a processor, the various processes of the above-mentioned temperature control method embodiment are implemented and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0081] It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In addition, it should be noted that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the opposite order according to the functions involved. For example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0082] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better embodiment. Based on this understanding, the technical solution of this application, or the part that contributes to the existing technology, 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 a number of instructions for enabling a terminal (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of this application.

[0083] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims, all of which are within the protection of this application.

[0084] The terms "first," "second," and the like in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, the term "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0085] In the description of this application, “plurality” means two or more.

[0086] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0087] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A temperature control system for a battery pack, characterized in that: Including a temperature control component, the battery pack includes two battery groups, wherein: When an abnormal temperature fault occurs in one of the battery packs, power is supplied by the other battery pack, and the battery pack is cooled by the temperature control component; the temperature control system further includes a battery management controller, which is used to: When an abnormal temperature fault occurs in one of the battery packs, the loop of the battery pack where the faulty battery pack is located is disconnected, and the loop of the other battery pack where the faulty battery pack is located is closed; 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 electrode of one of the battery packs is connected to the first end of the load via the first relay, the negative electrode is connected to the positive electrode of the other battery pack, and the negative electrode of the other battery pack is connected to the second end of the load via the second relay; the connection point between the two battery packs is connected to the first end via the third relay, and to the second end via the fourth relay; The battery management controller is specifically used for: When a temperature abnormality fault occurs in one of the battery packs, the first relay, the second relay, the third relay, and the fourth relay are controlled to open and close the circuit of the battery pack discharge circuit where the faulty battery pack is located, and close the circuit of the other battery pack in the battery pack discharge circuit; The temperature control assembly includes a refrigerant circulation assembly and a coolant circulation assembly. The refrigerant circulation assembly not only cools the battery pack but also cools the passenger compartment of the vehicle. The coolant circulation assembly not only cools the battery pack but also heats the passenger compartment and the battery pack. The refrigerant circulation assembly includes a first circuit and a second circuit sharing a condenser and a compressor, the first circuit and the second circuit being used to cool the battery pack and the passenger compartment, respectively; the coolant circulation assembly includes a third circuit, a fourth circuit, and a fifth circuit sharing a water tank, the third circuit being used to cool the battery pack, and the fourth circuit and the fifth circuit being used to heat the passenger compartment and the battery pack, respectively; The control system further includes a thermal management controller connected to the temperature control component and configured to: When an abnormal temperature fault occurs in one of the battery packs, the temperature control component is controlled to cool the battery pack; the coolant circulation component includes a water tank, a second water pump, a first heat exchanger and a second heat exchanger, the first heat exchanger is arranged near 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 an abnormal temperature fault occurs in one of the battery packs, starting the second water pump to cool the battery pack; The coolant circulation assembly further includes a heater, a first water pump, a heater core, and a three-way valve, wherein the inlet of the first water pump is connected to the water tank, the outlet of the first water pump is connected to the inlet of the heater, the outlet of the heater is connected to one port of the three-way valve, the other two ports of the three-way valve are respectively connected to the inlet of the heater core and the inlet of the second heat exchanger, and the outlet of the second heat exchanger is connected to the outlet of the heater core and the water tank; The water tank, the second water pump, the first heat exchanger, and the second heat exchanger constitute the third circuit, and the heater, the first water pump, the water tank, and the second heat exchanger constitute the fifth circuit.

2. The temperature control system of the battery pack according to claim 1, characterized in that: The two battery packs are a first battery pack and a second battery pack, the positive electrode of the first battery pack is connected to the first relay, and the negative electrode of the second battery pack is connected to the second relay, and the battery management controller is specifically used to: When an abnormal temperature fault occurs in the first battery pack, the first relay and the fourth relay are controlled to be in an open state, and the second relay and the third relay are controlled to be in a closed state; When an abnormal temperature fault occurs in the second battery pack, the second relay and the third relay are controlled to be in an open state, and the first relay and the fourth relay are controlled to be in a closed state.

3. The temperature control system of the battery pack according to claim 1, characterized in that: The thermal management controller is used to: When an abnormal temperature fault occurs in one of the battery packs, the temperature control component is controlled to cool the faulty battery pack in the battery pack.

4. The temperature control system of the battery pack according to claim 1, characterized in that: The refrigerant cycle assembly includes a compressor, a condenser, a fan, a first expansion valve, and a first heat exchanger, wherein 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; The thermal management controller is specifically used for: When an abnormal temperature fault occurs in one of the battery packs, the compressor, the first expansion valve and the fan are started to cool the battery pack.

5. A temperature control method, characterized in that: A temperature control system for a battery pack according to any one of claims 1 to 4, wherein the temperature control method comprises: When an abnormal temperature fault occurs in one of the battery packs, the other battery pack is controlled to supply power, and the temperature control component is controlled to cool the battery pack.

6. A temperature control device, characterized in that: The device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the temperature control method according to claim 5 is implemented when the processor executes the program.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the temperature control method according to claim 5 is implemented.

8. A computer program product comprising a computer program, characterized in that When the computer program is executed by a processor, the temperature control method according to claim 5 is implemented.

9. A vehicle, characterized in that: A temperature control system comprising a battery pack as claimed in any one of claims 1 to 4.

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