Battery pack, battery pack temperature control method, and battery management system

Abstract

The invention provides a battery pack, a temperature control method of the battery pack and a battery management system. The battery pack comprises a control unit, at least two battery assemblies and a thermal management system, a power supply loop is arranged between the at least two battery assemblies and the thermal management system; and the control unit is connected with the power supply loop and is used for controlling at least one second battery assembly except the first battery module in the at least two battery assemblies to supply power to the thermal management system under the condition that the temperature of the first battery assembly in the at least two battery assemblies is abnormal. According to the embodiment of the invention, when the temperature of no battery assembly is abnormal, the battery pack normally supplies power to the outside, and when the temperature of the battery assembly in the battery pack is abnormal, the thermal management system is started through the remaining battery assemblies which are not abnormal, and the thermal management system processes the temperature of the battery pack, so that active cooling can be realized when thermal runaway occurs, and the service life of the battery pack is prolonged. Compared with the mode of waiting for natural cooling after thermal runaway occurs, the method has higher cooling efficiency and safety.

Description

Technical Field

[0001] The present application relates to the field of battery management, and in particular to a battery pack, a temperature control method for a battery pack, and a battery management system. Background Art

[0002] Abnormal battery pack temperatures can lead to a range of serious consequences, including reduced battery performance and lifespan, safety issues, and even explosions and fires. For example, thermal runaway, a chain reaction phenomenon triggered by various factors, can rapidly increase the internal temperature of the battery pack, generating significant amounts of heat and harmful gases, which can ultimately cause the pack to catch fire or explode. To prevent the spread of abnormal battery pack temperatures, thermal isolation measures such as thermal resistors and thermal breakers are implemented within the battery pack. When a battery cell experiences an abnormal temperature, these devices quickly isolate it from other cells, preventing heat dissipation and ensuring the safety of the entire battery pack. However, the battery pack's overall thermal insulation performance slows heat transfer between the internal and external components. If some cells within the pack experience abnormal temperatures, these abnormal cells can affect normal cells, impacting the normal operation of other cells. Summary of the Invention

[0003] The embodiments of the present application provide a battery pack, a temperature control method for a battery pack, and a battery management system to solve the technical problem of slow heat dissipation during thermal runaway of a battery pack in the prior art.

[0004] In a first aspect, the present application provides a battery pack, comprising: a control unit, at least two battery assemblies, and a thermal management system; a power supply circuit is provided between the at least two battery assemblies and the thermal management system;

[0005] The control unit is connected to the power supply circuit and is used to control at least one second battery assembly other than the first battery assembly in the at least two battery assemblies to supply power to the thermal management system when the temperature of the first battery assembly in the at least two battery assemblies is abnormal.

[0006] In one embodiment, a first power supply circuit is provided between at least two battery assemblies and the thermal management system;

[0007] The first power supply circuit is connected to the control unit, which is used to control the first power supply circuit of the second battery assembly to be turned on when the temperature of the first battery assembly is abnormal. The first power supply circuit is used to instruct any one of the at least two battery assemblies to supply power to the thermal management system separately.

[0008] In one embodiment, a second power supply circuit is provided between at least two battery assemblies and the thermal management system;

[0009] The second power supply circuit is connected to the control unit, which is also used to control the disconnection of the second power supply circuit of the first battery assembly and the second power supply circuit of the second battery assembly when the temperature of the first battery assembly is abnormal. The second power supply circuit is used to instruct at least two battery assemblies to supply power to the external load.

[0010] In one embodiment, the control unit is further used to control the first power supply circuits of at least two battery assemblies to be turned on and to control the first power supply circuits of at least two battery assemblies to be turned off when none of the at least two battery assemblies has an abnormal temperature.

[0011] In one embodiment, the battery pack further includes: a first switch and a second switch corresponding to each battery assembly;

[0012] The first switch corresponding to each battery assembly is connected to the second power supply circuit between each battery assembly and the thermal management system, and the second switch corresponding to each battery assembly is connected to the first power supply circuit between each battery assembly and the thermal management system;

[0013] The control ends of the first switch and the second switch are both connected to the control unit. The control unit is used to control the first switch of the first battery assembly and the first switch of the second battery assembly to be disconnected, and control the second switch of the second battery assembly to be closed when the temperature of the first battery assembly is abnormal.

[0014] In one embodiment, the battery pack further includes: a circuit protection unit;

[0015] The circuit protection unit is connected to the power supply circuit between at least two battery assemblies and the thermal management system;

[0016] The circuit protection unit is used to disconnect the power supply circuit when an abnormality is detected in the power supply circuit.

[0017] In one embodiment, the first switch and the second switch are relays.

[0018] In one embodiment, the circuit protection unit is a fuse.

[0019] In one embodiment, the battery pack further includes: a switch unit;

[0020] The switch unit is connected to the first power supply circuit of at least two battery assemblies, the switch unit includes a switch corresponding to each battery assembly, a first end of the switch unit is connected to the at least two battery assemblies, a second end of the switch unit is connected to the thermal management system, and a control end of the switch unit is connected to the control unit;

[0021] The control unit is used to control the corresponding switch of the second battery assembly in the switch unit to be turned on when the temperature of the first battery assembly is abnormal.

[0022] In one embodiment, the battery pack further includes: a voltage conversion unit;

[0023] The input end of the voltage conversion unit is connected to the output end of the switch unit, and the output end of the voltage conversion unit is connected to the input end of the thermal management system;

[0024] The voltage conversion unit is used to convert the output voltage of the second battery assembly into an operating voltage of the thermal management system.

[0025] In one embodiment, the control unit is further connected to the control terminal of the voltage conversion unit;

[0026] The control unit is further used to determine the voltage conversion parameters of the voltage conversion unit according to the number and / or output voltage of the second battery assembly, and control the voltage conversion unit to perform voltage conversion according to the voltage conversion parameters.

[0027] In one embodiment, the battery pack further includes: an energy storage unit;

[0028] A first end of the energy storage unit is connected to the battery pack, and a second end of the energy storage unit is connected to the first end of the switch unit;

[0029] An energy storage unit is used to store energy of a third battery assembly among the at least two battery assemblies, or to release energy to at least one fourth battery assembly other than the third battery assembly among the at least two battery assemblies.

[0030] In one embodiment, the control unit is further configured to control the switch corresponding to the third battery assembly in the switch unit and the switch corresponding to the fourth battery assembly in the switch unit to be alternately turned on;

[0031] When the switch corresponding to the third battery assembly in the switch unit is turned on, the third battery assembly charges the energy storage unit; when the switch corresponding to the fourth battery assembly in the switch unit is turned on, the energy storage unit charges the fourth battery assembly.

[0032] In one embodiment, the battery pack further includes a data collector; the control unit is further connected to the data collector;

[0033] The control unit is also used to obtain data collected by the data collector and determine whether the temperature of the battery assembly is abnormal based on the collected data.

[0034] In one embodiment, the collected data includes one or more of air pressure data, insulation data, voltage data, and temperature data.

[0035] In one embodiment, the battery pack further includes a battery management system, and the control unit belongs to the battery management system.

[0036] In a second aspect, the present application provides a temperature control method for a battery pack, wherein the battery pack includes at least two battery assemblies, and a power supply circuit is provided between the at least two battery assemblies and a thermal management system of the battery pack. The method includes:

[0037] When the temperature of a first battery assembly among the at least two battery assemblies is abnormal, at least one second battery assembly other than the first battery assembly among the at least two battery assemblies is controlled to supply power to the thermal management system.

[0038] In a third aspect, an embodiment of the present application further provides a battery management system for a battery pack, wherein the battery pack includes at least two battery assemblies, and a power supply circuit is provided between the at least two battery assemblies and a thermal management system of the battery pack;

[0039] The battery management system is used to control the temperature of the battery pack, and is specifically used in the method steps in the above embodiment.

[0040] In a fourth aspect, an embodiment of the present application provides an electronic device, including: a memory, a processor;

[0041] Memory stores computer-executable instructions;

[0042] The processor executes the computer-executable instructions stored in the memory, so that the processor executes various possible implementations of the first aspect and / or the second aspect as described above.

[0043] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the first aspect above and / or various possible implementation methods of the first aspect.

[0044] In a sixth aspect, an embodiment of the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the first aspect and / or various possible implementation methods of the first aspect.

[0045] The embodiments of the present application provide a battery pack, a method for controlling the temperature of a battery pack, and a battery management system. The battery pack includes: a control unit, at least two battery assemblies, and a thermal management system; a power supply circuit is provided between the at least two battery assemblies and the thermal management system; the control unit is connected to the power supply circuit and is configured to control at least one second battery assembly other than the first battery module in the at least two battery assemblies to supply power to the thermal management system when the temperature of a first battery assembly in the at least two battery assemblies is abnormal. The embodiments of the present application divide the battery pack into multiple battery assemblies. When there is no abnormal temperature of a battery assembly in the battery pack, the battery pack supplies power to the outside normally. When there is an abnormal temperature of a battery assembly in the battery pack, the thermal management system is activated by the remaining battery assemblies that are not abnormal. The thermal management system processes the temperature of the battery pack, and can achieve active cooling when thermal runaway occurs. Compared with waiting for natural cooling after thermal runaway occurs, the cooling efficiency and safety are higher. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0047] Figure 1 A schematic diagram of the structure of a battery cell in a battery pack provided in one embodiment;

[0048] Figure 2 A schematic diagram of the structure of a battery pack provided in one embodiment Figure 1 ;

[0049] Figure 3 A schematic diagram of the structure of a battery pack provided in one embodiment Figure 2 ;

[0050] Figure 4 A schematic diagram of the structure of a battery pack provided in one embodiment Figure 3 ;

[0051] Figure 5 A schematic diagram of the structure of a battery pack provided in one embodiment Figure 4 ;

[0052] Figure 6 A schematic diagram of the structure of a battery pack provided in one embodiment Figure 5 ;

[0053] Figure 7 A schematic diagram of the structure of a battery pack provided in one embodiment Figure 6 ;

[0054] Figure 8 A schematic diagram of the structure of a battery pack provided in one embodiment Figure 7 ;

[0055] Figure 9 A voltage amplifying circuit provided in one embodiment;

[0056] Figure 10 A schematic diagram of the structure of a battery pack provided in one embodiment Figure 8 ;

[0057] Figure 11 A schematic diagram of the structure of a battery pack provided in one embodiment Figure 9 ;

[0058] Figure 12 A power supply circuit diagram of a battery pack provided in one embodiment;

[0059] Figure 13 A schematic diagram of a power supply circuit for M2 to power a thermal management system in one embodiment;

[0060] Figure 14 A schematic diagram of a power supply circuit for M1 to power a thermal management system in one embodiment;

[0061] Figure 15 An internal structure diagram of an electronic device is provided in one embodiment.

[0062] Reference numerals:

[0063] 1: battery cell, 2: thermal insulation material, 10: control unit, 20: at least two battery assemblies, 201: first battery assembly, 202: second battery assembly, 203: third battery assembly, 204: fourth battery assembly, 30: thermal management system, 40: first switch, 50: second switch, 60: circuit protection unit; 70: switch unit, 80: voltage conversion unit, 90: energy storage unit.

[0064] The above drawings illustrate specific embodiments of the present application, which will be described in more detail below. These drawings and the textual description are not intended to limit the scope of the present application in any way, but rather to illustrate the concepts of the present application to those skilled in the art by reference to specific embodiments. DETAILED DESCRIPTION

[0065] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0066] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. It will be understood that the terms "first", "second", etc. used in this application may be used herein to describe various information or data, but these elements are not limited by these terms. These terms are only used to distinguish the first information from another information. For example, without departing from the scope of this application, the first action information may be referred to as the second action information, and similarly, the second action information may be referred to as the first action information. Both the first action information and the second action information are action information, but they are not the same action information.

[0067] First, let’s explain the terms involved in this application:

[0068] Cell: A cell is the most basic element in a battery assembly or pack, representing a single battery cell. It typically provides a specific voltage (usually between 3V and 4V) and has a specific capacity. Cells can be cylindrical, prismatic, or in a soft-pack form, and contain components such as the positive electrode, negative electrode, separator, and electrolyte.

[0069] Battery assemblies: Battery assemblies consist of multiple battery cells connected in series, parallel, or both to provide higher voltage and capacity. Battery assemblies typically also include an integrated battery management system (BMS) to monitor and manage the status of each battery cell, ensuring safety and consistent performance. Battery assembly voltages can range from 12V to 1000V, with capacities ranging from tens of ampere-hours to hundreds of kiloampere-hours.

[0070] Battery Pack: A battery pack consists of multiple battery cells and includes a housing, connectors, protective devices, a cooling system, and more. The battery pack is designed for higher energy and power density to provide longer driving range and higher power output. It also includes a more advanced management system to monitor battery status, control charging and discharging, and provide safety protection.

[0071] Battery Management System (BMS): Responsible for monitoring and managing battery components, ensuring their safe use during the charging and discharging process. Key BMS functions include measuring battery terminal voltage, balancing energy between cells, estimating state of charge and state of health, limiting power input and output, controlling charging curves, and isolating battery components from the load.

[0072] The vehicle thermal management system (TMS) consists of systems and circuits such as the battery thermal management system, the drive system thermal management system, the interior thermal management system, and the exterior air thermal management system. It manages the heat generated during vehicle operation. The TMS maintains the battery module temperature within an appropriate range by circulating a fluid medium, regardless of the ambient temperature inside and outside the vehicle. It also adjusts the operating state of the battery control system in real time based on vehicle speed and battery level fluctuations, and responds to high and low temperature alarms, thereby improving battery safety and lifespan.

[0073] Thermal runaway refers to a chain reaction phenomenon caused by various factors. Thermal runaway will cause the temperature inside the battery pack to rise rapidly, generating a large amount of heat and harmful gases, which may eventually cause the battery pack to catch fire or explode. In order to prevent the spread of thermal runaway of the power battery pack, thermal isolation measures are taken in the battery pack, such as Figure 1 As shown, thermal insulation material 2 is provided between battery cells 1 and 1. When a battery cell experiences an abnormal temperature, these devices can quickly cut off the connection between the abnormal battery cell and other battery cells to prevent heat diffusion, thereby ensuring the safety of the entire battery pack. In battery pack applications, if a battery cell experiences thermal runaway, the battery pack's external power supply is usually cut off to ensure the safety of the entire vehicle. At this time, the vehicle's thermal management system cannot operate to remove the heat generated by the thermal runaway battery cells in the battery pack. The heat can only be slowly dissipated through natural cooling. However, due to the good overall thermal insulation performance of the battery pack, the heat of the abnormal battery cell cannot quickly diffuse into the environment during thermal runaway. Instead, it diffuses inside the pack, affecting the normal operation of other battery cells.

[0074] In order to solve the above technical problems, the embodiments of the present application provide a battery pack capable of achieving active cooling, a temperature control method for the battery pack, and a battery management system by adding some control circuits without affecting the existing functions of the battery pack.

[0075] The following specific embodiments describe in detail the technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0076] In a first aspect, an embodiment of the present application provides a battery pack, such as Figure 2 As shown, the battery pack includes: a control unit 10, at least two battery assemblies 20 (including battery assemblies 1 to n, n ≥ 2), and a thermal management system 30 of the battery pack; a power supply circuit is provided between the at least two battery assemblies 20 and the thermal management system 30;

[0077] The control unit 10 is connected to the power supply circuit and is used to control at least one second battery assembly 202 other than the first battery assembly 201 in at least two battery assemblies 20 to power the thermal management system 30 when the temperature of the first battery assembly 201 in at least two battery assemblies 20 is abnormal.

[0078] Functionally, at least two battery assemblies 20 in the battery pack of the embodiment of the present application provide electrical energy to the power consumption system, and the power consumption system includes a thermal management system 30. The thermal management system 30 is used to manage the temperature of the at least two battery assemblies 20. Exemplarily, at least two battery assemblies 20 will generate a certain amount of heat during normal charging and discharging. In order to ensure the safety of at least two battery assemblies 20 during normal charging and discharging, the heat generated by the at least two battery assemblies 20 is managed by the thermal management system 30. The thermal management system 30 can cool the at least two battery assemblies 20 using both air cooling and liquid cooling. The thermal management system 30 is part of the automotive thermal management system. In addition, when at least two battery assemblies 20 are in a cold state, the thermal management system 30 can also heat them up.

[0079] During normal charging and discharging of at least two battery assemblies 20, the at least two battery assemblies 20 provide power to the thermal management system 30, which regulates the temperature of the at least two battery assemblies 20 during normal charging and discharging. However, if the temperatures of at least two battery assemblies 20 are abnormal, to ensure safety, all external power circuits to the at least two battery assemblies 20 will be disconnected, including the power circuit to the thermal management system 30. For example, abnormal battery assembly temperatures may be caused by thermal runaway, which can have a significant impact on the safety of the entire battery pack.

[0080] Therefore, in the embodiment of the present application, under normal power supply conditions, there is a main power supply circuit between at least two battery assemblies 20 and the thermal management system 30, and the thermal management system 30 is powered by at least two battery assemblies 20. Specifically, under normal power supply conditions, the connection relationship between the at least two battery assemblies 20 can be in series, in parallel, or in a combination of series and parallel. There is also a separate power supply circuit between the at least two battery assemblies 20 and the thermal management system 30. Under normal power supply conditions, the separate power supply circuit is disconnected, and the thermal management system 30 is powered by at least two battery assemblies 20. In the event that the temperature of the at least two battery assemblies 20 is abnormal, the thermal management system 30 can be powered by other normal battery assemblies to achieve active cooling.

[0081] For example, under normal circumstances, at least two battery assemblies 20 provide energy to the outside in a series manner, that is, at least two battery assemblies 20 are connected in series with the thermal management system 30 .

[0082] It should be noted that the division of the battery components is to power the thermal management system 30 through another part of the battery cells when there is a temperature abnormality in the battery cells in the battery component. Therefore, the division of the battery components is set in advance, and the number of battery cells in each battery component is not limited. For example, the battery component can be 2*1 or 2*2 or 2*3 or 2*4. In addition, since any battery component may have a temperature abnormality, any remaining battery component or combination of battery components in the circuit structure design can power the thermal management system 30. Combined with the size of the operating voltage of the thermal management system, it is usually divided into two battery components with similar voltage differences, so that the voltage of the normal battery component can be processed to power the thermal management system 30.

[0083] Specifically, the first battery assembly 201 refers to the battery assembly with an abnormal temperature among the at least two battery assemblies 20, and the second battery assembly refers to the battery assembly with a normal temperature among the at least two battery assemblies 20 that supplies power to the thermal management system 30. In the embodiment provided herein, the battery status of the at least two battery assemblies 20 is monitored in real time by the control unit 10, which determines the first battery assembly 201 among the at least two battery assemblies 20 based on the monitoring results. There can be multiple first battery assemblies 201, but the number of first battery assemblies 202 cannot be equal to the total number of battery assemblies in the at least two battery assemblies 20. In other words, if the temperatures of all battery assemblies are abnormal, there is no safe battery assembly, and the thermal management system 30 cannot be powered.

[0084] After determining the first battery assembly 201 with an abnormal temperature among the at least two battery assemblies 202, power is supplied to the thermal management system 30 through the battery assemblies other than the first battery assembly 201. The number of second battery assemblies 202 supplying power to the thermal management system 30 may be one or more. In the case of multiple second battery assemblies 202, the multiple second battery assemblies 202 may be connected in series to supply power to the thermal management system 30.

[0085] In the battery pack provided in the above embodiment, the battery pack includes: a control unit, at least two battery assemblies, and a thermal management system; a power supply circuit is provided between the at least two battery assemblies and the thermal management system; the control unit is connected to the power supply circuit and is used to control at least one second battery assembly other than the first battery module in the at least two battery assemblies to supply power to the thermal management system when the temperature of the first battery assembly in the at least two battery assemblies is abnormal. The embodiment of the present application divides the battery pack into multiple battery assemblies. When there is no abnormal temperature of a battery assembly in the battery pack, the battery pack supplies power to the outside normally. When there is an abnormal temperature of a battery assembly in the battery pack, the thermal management system is activated by the remaining battery assemblies that are not abnormal. The thermal management system processes the temperature of the battery pack, and can achieve active cooling when thermal runaway occurs. Compared with waiting for natural cooling after thermal runaway occurs, it has higher cooling efficiency and safety.

[0086] In one embodiment, a first power supply circuit is provided between at least two battery assemblies 20 and the thermal management system 30 ;

[0087] The first power supply circuit is connected to the control unit 10, which is used to control the first power supply circuit of the second battery assembly 202 to be turned on when the temperature of the first battery assembly 201 is abnormal. The first power supply circuit is used to instruct any one of at least two battery assemblies 20 to supply power to the thermal management system 30 separately.

[0088] In one embodiment, a second power supply circuit is provided between at least two battery assemblies 20 and the thermal management system 30 ;

[0089] The second power supply circuit is connected to the control unit 10, which is also used to control the disconnection of the second power supply circuit of the first battery assembly 201 and the second power supply circuit of the second battery assembly 202 when the temperature of the first battery assembly 201 is abnormal. The second power supply circuit is used to instruct at least two battery assemblies 20 to supply power to external loads.

[0090] The first power supply circuit for at least two battery assemblies 20 refers to the independent power supply circuit for the thermal management system 30, when any of the at least two battery assemblies 20 acts as the second battery assembly 202 in the event of a battery assembly temperature anomaly. The second power supply circuit refers to the main external power supply circuit for the at least two battery assemblies 20 when the temperatures of the at least two battery assemblies 20 are normal. This circuit is used to power external loads, such as the battery pack in a vehicle that supplies power to the entire vehicle electrical system. In this case, the battery pack's thermal management system, including the battery pack, is considered an external load. The second power supply circuit is the normal discharge circuit for the at least two battery assemblies 20.

[0091] The connection relationship between all battery assemblies in at least two battery assemblies 20 is undefined, and therefore, the relationship between the second power supply circuits of the first battery assembly 201 and the second battery assembly 202 is also undefined. For example, when all battery assemblies in a battery pack are connected in parallel, each battery assembly has a first power supply circuit that solely powers the thermal management system 30, and a second power supply circuit that powers all connected external loads. In this case, the second power supply circuit of each battery assembly can be a portion of the first power supply circuit, that is, the portion that solely powers the thermal management system 30.

[0092] When all battery assemblies in at least two battery assemblies 20 are connected in series, they form a single unit to power all connected external loads. Therefore, all battery assemblies have only one, identical, second power supply circuit. That is, the second power supply circuit of the first battery assembly 201 serves as the second power supply circuit of the second battery assembly 202. Once the second power supply circuit of the first battery assembly 201 is disconnected, the second power supply circuit of the second battery assembly 202 is also disconnected.

[0093] When one or more battery assemblies are required to independently power the thermal management system 30, a first power supply circuit for one or more battery assemblies needs to be deployed. In this case, the first power supply circuit can be a separate circuit between the battery assembly and the thermal management system 30. Alternatively, a portion of the second power supply circuit of each battery assembly can be used to construct the first power supply circuit. By switching the power supply circuit, the second battery assembly 202 can be used to power the thermal management system 30. Specifically, a corresponding circuit switch can be deployed on the second power supply circuit of each battery assembly. By controlling the circuit switch through the control unit 10, the deployment of the first power supply circuit can be completed while adding less circuit structure.

[0094] When the temperatures of all battery assemblies of at least two battery assemblies 20 are normal, the control unit 10 controls the second power supply circuit of at least two battery assemblies 20 to be turned on, and controls the first power supply circuit of at least two battery assemblies 20 to be turned off, so as to achieve normal discharge of at least two battery assemblies 20 to the outside.

[0095] In the battery pack provided in the above embodiment, the power supply circuits of at least two battery assemblies 20 are divided, including a second power supply circuit during normal power supply and a first power supply circuit during single power supply. When it is found that the temperature of some battery assemblies in the battery pack is abnormal, the power supply status of all battery assemblies is quickly switched.

[0096] In one embodiment, Figure 3 As shown, the battery pack further includes: a first switch 40 and a second switch 50 corresponding to each battery assembly;

[0097] The first switch 40 corresponding to each battery assembly is connected to the second power supply circuit between each battery assembly and the thermal management system 30, and the second switch 50 corresponding to each battery assembly is connected to the first power supply circuit between each battery assembly and the thermal management system 30;

[0098] The control ends of the first switch 40 and the second switch 50 are both connected to the control unit 10. The control unit 10 is used to control the first switch 40 of the first battery assembly 201 and the first switch 40 of the second battery assembly 202 to be disconnected when the temperature of the first battery assembly 201 is abnormal, and to control the second switch 50 of the second battery assembly 202 to be closed.

[0099] The first switch 40 is located on the second power supply circuit of each battery assembly. The on / off status of the first switch 40 determines whether at least two battery assemblies 20 (i.e., each battery assembly) provide external power. The second switch 50 is located on the first power supply circuit of each battery assembly. The on / off status of the second switch 50 determines whether the battery assembly provides independent power to the thermal management system 30.

[0100] It should be noted that the first switch 40 and the second switch 50 mentioned in this embodiment are defined based on their functions. The control unit 10 controls the first switch 40 of the first battery assembly 201 and the first switch 40 of the second battery assembly 202 to be disconnected, so that the first battery assembly 201 and the second battery assembly 202 cannot supply external power. In other words, by controlling the first switches 40 of all battery assemblies to be disconnected, the battery pack cuts off external power supply. The control unit 10 controls the second switch 50 of the second battery assembly 202 to be closed, so that the second battery assembly 202 supplies power to the thermal management system 30.

[0101] In actual application scenarios, after a temperature anomaly occurs in the first battery assembly 201, the first switches 40 of all battery assemblies will be controlled to be disconnected, thereby disconnecting the second power supply circuit to protect the safety of the battery pack and its load. Then, when the second battery assembly 202 supplies power to the thermal management system 30, since the first power supply circuit of the second battery assembly 202 may overlap with the second power supply circuit, the control unit 10 may need to close not only the second switch 50 on the first power supply circuit, but also the first switch 40 on the second power supply circuit of the second battery assembly 202 in order to enable the first power supply circuit to be turned on. Figure 4 As shown, the battery pack includes two battery assemblies M1 and M2, which are connected in series. If M1 fails, the first switches 40 of M1 and M2 are controlled to be disconnected, stopping external power supply. To provide independent power to the thermal management system, not only does M2's second switch 50 need to be controlled to be turned on, but M2's first switch 40 also needs to be switched from off to on.

[0102] In one embodiment, Figure 5 As shown, the battery pack further includes: a circuit protection unit 60;

[0103] The circuit protection unit 60 is connected to the power supply circuit between at least two battery assemblies 20 and the thermal management system 30 .

[0104] The circuit protection unit 60 is connected to the power supply circuit between at least two battery assemblies 20 and the thermal management system 30 to protect the safety of the power supply circuit. Each battery assembly is equipped with a circuit protection unit 60 on its first and second power supply circuits. The circuit protection units 60 are connected in series within the power supply circuit. If an abnormality occurs in the power supply circuit, the circuit protection unit 60 disconnects the power supply circuit to protect the battery assemblies and external loads.

[0105] It should be noted that a battery assembly typically has two circuit protection units 60, one protecting the first power supply circuit and the other protecting the second power supply circuit. However, for at least two battery assemblies 20, since there may be overlapping portions between the first power supply circuits and the second power supply circuits of the battery assemblies, the two circuit protection units 60 of the at least two battery assemblies 20 may be shared, depending on the circuit connection relationship of the at least two battery assemblies 20.

[0106] The circuit protection unit 60 and the first switch 40 and the second switch 50 can all function as a means of disconnecting the power supply circuit. However, the circuit protection unit 60 does not require the control of the control unit 10 to protect the circuit. The circuit protection unit 60 protects the power supply circuit based on the actual situation of the power supply circuit, such as detecting the current in the power supply circuit.

[0107] Specifically, the first switch 40 and the second switch 50 are relays, and the control unit 10 controls the on / off of the power supply circuit by controlling whether the relays are energized. The circuit protection unit 60 is a fuse, which can be connected to the relays to protect the power supply circuit. Figure 6 As shown, relay 1 is the first switch 40 of M1, relay 2 is the first switch 40 of M2, relay 3 is the second switch 50 of M1, and relay 4 is the second switch 50 of M2. Fuse 1 and fuse 2 are used to protect the safety of the second power supply circuit of M1 and M2, while fuse 3 and fuse 4 are used to protect the safety of the first power supply circuit of M1 and M2.

[0108] By setting the first switch and the second switch, the control unit can control the on-off of the first power supply circuit and the second power supply circuit with only a small number of components.

[0109] In one embodiment, Figure 7 As shown, the battery pack further includes: a switch unit 70;

[0110] The switch unit 70 is connected to the second power supply circuit of at least two battery assemblies 20. The switch unit 70 includes a switch corresponding to each battery assembly. A first end of the switch unit 70 is connected to the at least two battery assemblies 20, a second end of the switch unit 70 is connected to the thermal management system 30, and a control end of the switch unit 70 is connected to the control unit 10.

[0111] The control unit 10 is used to control the corresponding switch of the second battery assembly 202 in the switch unit 70 to be turned on when the temperature of the first battery assembly 201 is abnormal.

[0112] The switch unit 70 is used to switch the second power supply circuit between each battery assembly and the thermal management system 30. The switch unit 70 includes a switch circuit, which has the function of passing direct current and controlling the direction of current flow. Exemplarily, the switch circuit can be a circuit composed of a bridge circuit. For example, taking the at least two battery assemblies 20 including two battery assemblies M1 and M2 as an example, the bridge circuit includes multiple bridge arms, each bridge arm including an IGBT (Insulated Gate Bipolar Transistor) upper bridge arm and an IGBT lower bridge arm. The control unit 10 controls the conduction state of the upper and lower bridge arms of the switch circuit to achieve conduction control of the second power supply circuit of M1 and M2.

[0113] In the above embodiment, the switch unit is used to control the conduction and switching of the second power supply circuit, which is more convenient for the control unit. The switch unit can also control the direction of the current. Since the connection of the positive and negative poles of the power supply must be considered, the use of the switch unit can simplify the power supply circuit of multiple battery assemblies to the thermal management system.

[0114] In one embodiment, Figure 8 As shown, the battery pack further includes: a voltage conversion unit 80;

[0115] The input end of the voltage conversion unit 80 is connected to the output end of the switch unit 70 , and the output end of the voltage conversion unit 80 is connected to the input end of the thermal management system 30 ;

[0116] The voltage conversion unit 80 is used to convert the output voltage of the second battery assembly 202 into an operating voltage of the thermal management system 30 .

[0117] Because all battery assemblies in the battery pack are divided into at least two battery assemblies in this embodiment, when the second battery module 202 supplies power to the thermal management system 30, the supply voltage of the second battery module 202 may not reach the operating voltage of the thermal management system 30. For example, if at least two battery assemblies 20 have four battery assemblies connected in series, and if the voltage of each battery assembly is U, then under normal circumstances, the voltage provided by the at least two battery assemblies 20 to the thermal management system 30 is 4U, and the operating voltage of the thermal management system 30 is also 4U, then the at least two battery assemblies 20 can normally supply power to the thermal management system 30. However, if thermal runaway occurs in the first battery assembly 201, the one second battery assembly 202 can only provide a voltage of U. If only one second battery assembly 202 is supplying power to the thermal management system 30, the output voltage of the second battery assembly 202 needs to be amplified to drive the thermal management system 30.

[0118] In one embodiment, a voltage amplification circuit can be constructed by using transistors and diodes in a switching circuit to achieve voltage amplification. The voltage conversion unit 80 includes the following: Figure 9 The voltage amplifier circuit shown.

[0119] Specifically, the control unit 10 is also connected to the control terminal of the voltage conversion unit 80;

[0120] The control unit 10 is further configured to determine a voltage conversion parameter of the voltage conversion unit 80 according to the number and / or output voltage of the second battery assembly 202 , and control the voltage conversion unit 80 to perform voltage conversion according to the voltage conversion parameter.

[0121] In the above embodiment, the voltage conversion unit processes the output voltage of the second battery assembly to meet the operating voltage of the thermal management system and ensure that the thermal management system starts normally.

[0122] In one embodiment, Figure 10 As shown, the battery pack further includes: an energy storage unit 90;

[0123] A first end of the energy storage unit 90 is connected to at least two battery assemblies 20 , and a second end of the energy storage unit 90 is connected to a first end of the switch unit 70 ;

[0124] The energy storage unit 90 is used to store energy of the third battery assembly 203 among the at least two battery assemblies, or release energy to at least one fourth battery assembly 204 other than the third battery assembly 203 among the at least two battery assemblies.

[0125] Among them, the third battery assembly 203 is any battery assembly of the at least two battery assemblies 20, and the fourth battery assembly 204 is any battery assembly of the at least two battery assemblies 20 except the third battery assembly 203. The self-heating function is achieved by controlling the conduction state of the first power supply circuit and the second power supply circuit of the third battery assembly 203 and the fourth battery assembly 204. It should be noted that the self-heating function is usually triggered when the battery pack is operating normally due to the low temperature of the battery pack. At this time, it is required that no battery assembly in the battery pack has thermal runaway. Therefore, the first battery assembly 201 and the second battery assembly 202 are the division of at least two battery assemblies in the event of thermal runaway, while the third battery assembly 203 and the fourth battery assembly 204 are the division of at least two battery assemblies when the battery pack is normal.

[0126] In one embodiment, the control unit 10 is further configured to control the switch corresponding to the third battery assembly 203 in the switch unit 70 and the switch corresponding to the fourth battery assembly 204 in the switch unit 70 to be alternately turned on;

[0127] When the switch corresponding to the third battery assembly in the switch unit is turned on, the third battery assembly charges the energy storage unit; when the switch corresponding to the fourth battery assembly in the switch unit is turned on, the energy storage unit charges the fourth battery assembly.

[0128] The principle of the self-heating function is to use the direct current between at least two battery assemblies to charge each other, generate heat through the large current, and heat the battery pack from the inside out. When at least two battery assemblies are normal, if all battery assemblies are fully charged, it is impossible for one battery assembly to charge another battery assembly. By setting up an energy storage unit 90, energy is stored in the middle of the energy storage unit 90 to achieve the battery self-heating function under any circumstances. Specifically, the energy storage unit 90 includes a coil. When one battery assembly charges the coil, a magnetic field is generated in the coil. Subsequently, the charging circuit of the battery assembly to the coil is disconnected, and induced electricity is generated in the coil. At this time, the circuit between the other battery assembly and the coil is opened to charge the other battery assembly. Since the internal resistance of the battery assembly is usually large under low temperature conditions, a large amount of heat is generated during the charging and discharging process, achieving rapid and uniform temperature increase inside at least two battery assemblies. Among them, the energy storage unit 90 can be a three-phase motor.

[0129] The following describes the principle of self-heating by taking at least two battery assemblies 20 including two battery assemblies M1 and M2 as an example. Figure 10In the circuit shown, battery modules M1 and M2 are connected in series to supply power to the outside. At the connection point between the negative electrode of battery module M1 and the positive electrode of M2, a lead wire is connected to a three-phase motor. The windings in the motor are connected to a three-phase bridge circuit. The upper arm of the three-phase bridge circuit is connected to the negative electrode of battery module M2, and the lower arm is connected to the positive electrode of battery module M1. It should be noted that Figure 10 The circuit shown is only for the purpose of explaining the principle of the self-heating function. In actual applications, the circuit should also include circuit protection structures, such as loop switches and fuses.

[0130] Figure 11 In the circuit, the following two states are switched by controlling the state of the switch circuit: (1) Battery module M1 or M2 forms an RL oscillation circuit through the windings in the motor, and the motor stores energy; (2) The motor charges the stored energy to battery module M2 or M1. During the charging and discharging process, the battery module heats up due to its large internal resistance, which acts as a self-heating device.

[0131] Energy storage unit 90 is capable of passing direct current. Therefore, the switching circuit in switch unit 70 can control the direction of the current, enabling self-heating. Based on the circuitry that implements active cooling, both automatic heating and active cooling functions can be achieved without adding numerous components or changing the circuit structure, better protecting the health of the battery pack.

[0132] In one embodiment, the battery pack further includes a data collector, and the control unit 10 is further connected to the data collector; the control unit 10 is further used to obtain collected data of the battery assembly, and determine whether thermal runaway occurs in the battery assembly based on the collected data.

[0133] The data type in the collected data is used to indicate the health status of the battery pack and to measure whether the battery pack has thermal runaway. There are a large number of sensors in at least two battery assemblies 20 for obtaining the real-time status of at least two battery assemblies 20, such as the temperature, voltage, air pressure and other data of the battery pack. The collected data is collected for each battery assembly. Therefore, when there are multiple battery assemblies, there are multiple groups of collected data. Each group of collected data is sent to the control unit 10, which determines whether the corresponding battery assembly has thermal runaway or is about to have thermal runaway, thereby controlling the circuit.

[0134] Collected data includes one or more of air pressure, insulation, voltage, and temperature data. Specifically, air pressure detection is achieved through the air pressure sensor within the BDU (battery pack disconnect unit). When the air pressure changes beyond the fluctuation threshold, a thermal failure is considered. Insulation monitoring is achieved through the HVSU (High Voltage Safety Unit) monitoring pack+ and link+, confirming the pressure difference with the tray ground and determining failure. Voltage detection uses the internal collector of the battery pack to collect the cell pressure difference, and an alarm is issued if the battery pack pressure difference deviates from the normal range. Temperature detection uses a negative temperature coefficient thermistor (NTC) to detect temperature rise based on current changes, and an alarm is issued if the temperature exceeds the threshold.

[0135] If only one type of data is available, thermal failure is determined based on that data. If multiple data types are available, the number of abnormal data points can be set, and only those that meet the criteria can be considered to indicate thermal failure. For example, if both temperature and voltage are abnormal, thermal failure is determined. Alternatively, the importance of the data type can be determined, such as directly using temperature data, where any abnormal temperature data indicates thermal failure.

[0136] In practical applications, determining whether a battery component has thermal failure by collecting multiple data from the battery component can not only effectively avoid misjudgment caused by errors in a single data point, but also enable rapid determination when thermal failure of the battery component occurs, thereby ensuring the safety of the vehicle and personnel.

[0137] In the battery pack provided in the above embodiment, the control unit belongs to the battery management system of the battery pack, which monitors the real-time status of the battery pack and controls the second battery assembly to start the thermal management system to achieve active cooling when a battery assembly in the battery pack suffers from thermal failure.

[0138] Based on the above description, an embodiment of the present application provides a battery pack temperature management method, which is applied to a control unit. The battery pack includes at least two battery assemblies, and a power supply circuit is provided between the at least two battery assemblies and the thermal management system. The method includes:

[0139] When the temperature of a first battery assembly among the at least two battery assemblies is abnormal, at least one second battery assembly other than the first battery assembly among the at least two battery assemblies is controlled to supply power to the thermal management system.

[0140] The method provided in the above embodiment divides the battery pack into multiple battery components. When there is no abnormal temperature of the battery component, the battery pack supplies power to the outside normally. When there is an abnormal temperature of the battery component in the battery pack, the thermal management system is started by the remaining battery components with normal temperature. The thermal management system controls the temperature of the battery pack to achieve active cooling. Compared with waiting for natural cooling after thermal runaway occurs, it has higher cooling efficiency and safety.

[0141] For example, in order to avoid the harm caused by thermal runaway of a battery pack, a battery pack is provided to solve the thermal runaway problem. Figure 12 As shown, the battery pack in this embodiment includes a control unit 10, at least two battery assemblies 20, a thermal management system 30, a switch unit 70, a voltage conversion unit 80, an energy storage unit 90, relays 5-9, and fuses 5-6; wherein the at least two battery assemblies 20 include two battery assemblies M1 and M2;

[0142] The entire pack voltage of at least two battery assemblies 20 is V-pack, and the at least two battery assemblies 20 are divided into two battery assemblies M1 and M2. M1 and M2 are two modules with similar voltage differences. M1 and M2 are connected in series to supply power to the power system. A fuse 5 and a relay 5 are connected in series between the negative pole of M1 and the positive pole of M2. The positive pole of M1 is connected to the external power supply port through relay 6, and the negative pole of M2 is connected to the external power supply port through relay 7.

[0143] The negative electrode of M1 is connected to one end of the energy storage unit 90 via relay 8 and fuse 6, while the positive electrode of M2 is connected to one end of the energy storage unit 90 via relay 9 and fuse 6. The other end of the energy storage unit 90 is connected to one end of the switch unit 70; the upper bridge arm of the switch unit 70 is connected to the negative electrode of M2 and to the first input end of the voltage conversion unit 80; the lower bridge arm of the switch unit 70 is connected to the positive electrode of M1 and to the second input end of the voltage conversion unit 80; and the input end of the voltage conversion unit 80 is connected to the input end of the thermal management system 30.

[0144] During the normal charging and discharging process of at least two battery assemblies 20, the default state of relays 8 and 9 is disconnected, relays 5, 6 and 7 are energized, and at least two battery assemblies 20 are charged and discharged normally. The control unit 10 monitors the status of M1 and M2 in real time, and determines whether the battery assembly has thermal failure through air pressure detection, insulation detection, voltage detection and temperature detection strategies. After thermal failure occurs, relays 5, 6 and 7 are controlled to disconnect to ensure that at least two battery assemblies 20 no longer supply power to the outside, that is, to cut off the power supply of at least two battery assemblies 20 to all external loads. At this time, since relay 5 is disconnected, the voltage of the entire battery pack is degraded to 1 / 2V-pack.

[0145] If M1 fails due to thermal failure, the control unit 10 controls the relays 7 and 9 to be energized, and controls the lower bridge arm of the switch unit 70 to be turned on. At this time, the current of M2 flows out from the positive electrode, passes through the relay 9, the fuse 6, the energy storage unit 90, and the lower bridge arm of the switch unit 70, and flows into the voltage conversion unit 80. After powering the thermal management system 30, the current returns to the negative electrode of M2 through the voltage conversion unit 80 and the relay 7, forming a power supply circuit. Figure 13 shown.

[0146] If M2 fails due to thermal failure, the control unit 10 controls the relays 6 and 8 to be energized, and controls the upper bridge arm of the switch unit 70 to be turned on. At this time, the current of M2 flows out from the positive electrode, flows into the voltage conversion unit 80 through the relay 6, flows through the thermal management system 30, and then returns to the negative electrode of M1 through the voltage conversion unit 80, the upper bridge arm of the switch unit 70, the energy storage unit 90, the fuse 6, and the relay 8, forming a power supply circuit. Figure 14 shown.

[0147] In the above circuit, fuse 5 is used to protect at least two battery assemblies 20 from the main power supply circuit. In the event of thermal failure, relay 5, relay 6, and relay 7 are disconnected. Disconnecting relay 5 reduces the voltage of the entire pack to 1 / 2V-pack, reducing the risk of high voltage; disconnecting relays 6 and 7 is to prevent the main circuit from being turned on. If relay 5 is disconnected alone, arcing may occur under the load of the entire vehicle, and in the event of thermal runaway, the electrical safety distance will be reduced due to the harsh environmental conditions inside the pack. Therefore, relays 5, 6, and 7 need to be disconnected. Fuse 6 is used to protect the separate power supply circuit of M1 or M2 to the thermal management system 30.

[0148] In an automobile, the voltage output by the voltage conversion unit 80 can be used to activate the compressor in the vehicle's thermal management system, thereby achieving active cooling. Specifically, when the voltage output by the voltage conversion unit 80 activates the compressor, it needs to be connected to the compressor's input detection module. The input detection module performs voltage or power detection on the voltage output by the voltage conversion unit 80 and activates the compressor when the voltage reaches the starting voltage.

[0149] Figure 15 This is a schematic diagram of the structure of the electronic device provided in this application. Figure 15 As shown, the electronic device 150 provided in this embodiment includes: at least one processor 1501 and a memory 1502. Optionally, the device 150 also includes a communication component 1503. The processor 1501, the memory 1502, and the communication component 1503 are connected via a bus 1504.

[0150] During the specific implementation process, at least one processor 1501 executes the computer-executable instructions stored in the memory 1502, so that the at least one processor 1501 performs the above method.

[0151] The specific implementation process of the processor 1501 can be found in the above method embodiment. Its implementation principle and technical effects are similar and will not be repeated here in this embodiment.

[0152] In the above embodiments, it should be understood that the processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASICs), etc. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the present invention may be directly executed by a hardware processor or by a combination of hardware and software modules within the processor.

[0153] The memory may include random access memory (RAM) and may also include non-volatile memory (NVM), such as at least one disk storage.

[0154] A bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. Buses can be categorized as address buses, data buses, and control buses. For ease of illustration, the buses in the drawings of this application are not limited to just one bus or just one type of bus.

[0155] The present application also provides a computer program product, including a computer program, which implements the above method when executed by a processor.

[0156] The present application also provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the above method is implemented.

[0157] The readable storage medium may be implemented by any type of volatile or non-volatile memory device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The readable storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0158] An exemplary readable storage medium is coupled to a processor so that the processor can read information from the readable storage medium and write information to the readable storage medium. Of course, the readable storage medium can also be an integral part of the processor. The processor and the readable storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the readable storage medium can also exist in the device as discrete components.

[0159] The division of units is merely a logical functional division; actual implementations may employ alternative divisions, such as combining or integrating multiple units or components into another system, or omitting or disabling certain features. Furthermore, any direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between devices or units, either through an interface, electrical, mechanical, or other means.

[0160] Units described as separate components may or may not be physically separate, and components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0161] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0162] If a function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for enabling an electronic device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the various embodiments of the method of the present invention. The aforementioned storage medium includes various media that can store program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0163] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0164] Finally, it should be noted that those skilled in the art will readily identify other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The present invention is not limited to the precise structure described above and illustrated in the accompanying drawings, and various modifications and variations may be made without departing from the scope thereof. The scope of the present invention is limited solely by the appended claims.

[0165] An embodiment of the present application also provides a vehicle, which includes the battery pack according to any one of the above embodiments.

Claims

1. A battery pack, characterized in that: The battery pack comprises: a control unit (10), at least two battery assemblies (20) and a thermal management system (30); a power supply circuit is provided between the at least two battery assemblies (20) and the thermal management system (30); The control unit (10) is connected to the power supply circuit and is used to control at least one second battery assembly (202) other than the first battery assembly (201) in the at least two battery assemblies (20) to supply power to the thermal management system (30) when the temperature of the first battery assembly (201) in the at least two battery assemblies (20) is abnormal.

2. The battery pack according to claim 1, wherein: A first power supply circuit is provided between the at least two battery assemblies (20) and the thermal management system (30); The first power supply circuit is electrically connected to the control unit (10). The control unit (10) is used to control the first power supply circuit of the second battery assembly (202) to be turned on when the temperature of the first battery assembly (201) is abnormal. The first power supply circuit is used to instruct any one of the at least two battery assemblies (20) to supply power to the thermal management system (30) independently.

3. The battery pack according to claim 2, wherein: A second power supply circuit is further provided between the at least two battery assemblies (20) and the thermal management system (30); The second power supply circuit is connected to the control unit (10). The control unit (10) is further used to control the second power supply circuit of the first battery assembly (201) and the second power supply circuit of the second battery assembly (202) to be disconnected when the temperature of the first battery assembly (201) is abnormal. The second power supply circuit is used to instruct the at least two battery assemblies (20) to supply power to an external load.

4. The battery pack according to claim 3, wherein: The control unit (10) is further configured to control the second power supply circuits of the at least two battery assemblies (20) to be turned on, and to control the first power supply circuits of the at least two battery assemblies (20) to be turned off, when no battery assembly in the at least two battery assemblies (20) has abnormal temperature.

5. The battery pack according to claim 3, wherein: The battery pack further includes: a first switch (40) and a second switch (50) corresponding to each of the battery assemblies; A first switch (40) corresponding to each battery assembly is connected to a second power supply circuit between each battery assembly and the thermal management system (30), and a second switch (50) corresponding to each battery assembly is connected to the first power supply circuit between each battery assembly and the thermal management system (30); The control ends of the first switch (40) and the second switch (50) are both connected to the control unit (10). The control unit (10) is used to control the first switch (40) corresponding to the first battery assembly (201) and the first switch (40) corresponding to the second battery assembly (202) to be disconnected, and control the second switch (50) corresponding to the second battery assembly (202) to be closed when the temperature of the first battery assembly (201) is abnormal.

6. The battery pack according to claim 5, characterized in that: The battery pack further includes: a circuit protection unit (60); The circuit protection unit (60) is connected to the power supply circuit between the at least two battery assemblies (20) and the thermal management system (30); The circuit protection unit (60) is used to disconnect the power supply circuit when an abnormality in the power supply circuit is detected.

7. The battery pack according to claim 6, characterized in that: The first switch (40) and the second switch (50) are relays.

8. The battery pack according to claim 7, characterized in that: The circuit protection unit (60) is a fuse.

9. The battery pack according to claim 2, wherein: The battery pack further includes: a switch unit (70); The switch unit (70) is connected to the first power supply circuit of the at least two battery assemblies (20), the switch unit (70) includes a switch corresponding to each battery assembly, a first end of the switch unit (70) is connected to the at least two battery assemblies (20), a second end of the switch unit (70) is connected to the thermal management system (30), and a control end of the switch unit (70) is connected to the control unit (10); The control unit (10) is used to control the corresponding switch of the second battery assembly (202) in the switch unit (70) to be turned on when the temperature of the first battery assembly (201) is abnormal.

10. The battery pack according to claim 9, characterized in that: The battery pack further includes: a voltage conversion unit (80); The input end of the voltage conversion unit (80) is connected to the output end of the switch unit (70), and the output end of the voltage conversion unit (80) is connected to the input end of the thermal management system (30); The voltage conversion unit (80) is used to convert the output voltage of the second battery assembly (202) into an operating voltage of the thermal management system (30).

11. The battery pack according to claim 10, characterized in that: The control unit (10) is also connected to the control end of the voltage conversion unit (80); The control unit (10) is further configured to determine a voltage conversion parameter of the voltage conversion unit (80) based on the number and / or output voltage of the second battery assembly (202), and to control the voltage conversion unit (80) to perform voltage conversion according to the voltage conversion parameter.

12. The battery pack according to claim 9 or 10, characterized in that: The battery pack further includes: an energy storage unit (90); A first end of the energy storage unit (90) is connected to the battery pack (20), and a second end of the energy storage unit (90) is connected to a first end of the switch unit (70); The energy storage unit (90) is used to store energy of a third battery assembly (203) among the at least two battery assemblies, or to release energy to at least one fourth battery assembly (204) other than the third battery assembly (203) among the at least two battery assemblies.

13. The battery pack according to claim 12, wherein: The control unit (10) is further used to control the switch corresponding to the third battery assembly (203) in the switch unit (70) and the switch corresponding to the fourth battery assembly (204) in the switch unit (70) to be alternately turned on; When the switch corresponding to the third battery assembly (203) in the switch unit (70) is turned on, the third battery assembly (203) charges the energy storage unit (90); and when the switch corresponding to the fourth battery assembly (204) in the switch unit (70) is turned on, the energy storage unit (90) charges the fourth battery assembly (204).

14. The battery pack according to any one of claims 1 to 13, characterized in that: The battery pack further includes a data collector; the control unit (10) is also connected to the data collector; The control unit (10) is further configured to obtain data collected by the data collector and determine whether the temperature of the battery assembly is abnormal based on the collected data.

15. The battery pack according to claim 14, characterized in that: The collected data includes one or more of air pressure data, insulation data, voltage data and temperature data.

16. The battery pack according to any one of claims 1 to 13, characterized in that: The battery pack also includes a battery management system, and the control unit (10) belongs to the battery management system.

17. A method for controlling the temperature of a battery pack, characterized in that: The battery pack includes at least two battery assemblies, a power supply circuit is provided between the at least two battery assemblies and a thermal management system of the battery pack, and the method includes: When the temperature of a first battery assembly among the at least two battery assemblies is abnormal, at least one second battery assembly other than the first battery assembly among the at least two battery assemblies is controlled to supply power to the thermal management system.

18. A battery management system for a battery pack, characterized in that: The battery pack includes at least two battery assemblies, and a power supply circuit is provided between the at least two battery assemblies and the thermal management system of the battery pack; The battery management system is used to control the temperature of the battery pack, specifically to execute the method steps described in claim 17.

19. An electronic device, characterized in that: include: Memory, processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, causing the processor to perform the method of claim 17 .

20. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to claim 17 when executed by a processor.

21. A computer program product, characterized in that The invention comprises a computer program which, when executed by a processor, implements the method of claim 17 .

Images