Battery system and electric device

Abstract

The utility model relates to a battery system and a power utilization device. The battery system comprises a battery module, a charging module, a thermal management mechanism, a pressure relief mechanism and a controller. The battery module comprises a plurality of single batteries, each single battery comprises a shell and an electrode assembly, the shell comprises a wall part, and the electrode assembly is arranged in the shell. The charging module is connected to the battery module and is configured to provide electric energy to the battery cells. The heat management mechanism is arranged on the side, back to the electrode assembly, of the wall part. The pressure relief mechanism comprises a pressure relief body and a driving assembly, the pressure relief body is arranged on the wall part, and the driving assembly is arranged on the pressure relief body and configured to drive the pressure relief body to be opened. The controller is in communication connection with the charging module, the heat management mechanism and the driving assembly and is configured to control starting and stopping of the charging module and the heat management mechanism and control operation of the driving assembly. According to the embodiment of the invention, the adverse effect of thermal runaway on the battery system can be effectively relieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery system and a power utilization device. BACKGROUND

[0002] With the rapid development of new energy vehicles, the safety of the battery has become the focus of attention. The battery is usually provided with an explosion-proof valve. When the battery is overheated or the pressure is too large, the explosion-proof valve will be opened under the action of air pressure to reduce the air pressure and energy accumulation in the battery in time.

[0003] Although the explosion-proof valve on the existing battery can release pressure, when the explosion-proof valve is opened, the chemical reaction in the battery has reached a severe degree, and there is still a possibility of adversely affecting the safety of the entire battery. UTILITY MODEL CONTENT

[0004] The utility model embodiment provides a battery system and a power utilization device, which can effectively alleviate the adverse effects of thermal runaway on the battery system.

[0005] On the one hand, according to the battery system provided by the embodiment of the present application, the battery system comprises: a battery module comprising a plurality of battery monomers, the battery monomer comprising a shell and an electrode assembly, the shell comprising a wall portion, and the electrode assembly being arranged in the shell; a charging module connected to the battery module and configured to provide electrical energy to the battery monomer; a thermal management mechanism arranged on a side of the wall portion away from the electrode assembly; a pressure relief mechanism comprising a pressure relief body and a driving assembly, the pressure relief body being arranged on the wall portion, and the driving assembly being arranged on the pressure relief body and configured to drive the pressure relief body to open; and a controller in communication connection with the charging module, the thermal management mechanism and the driving assembly, and configured to control the opening and closing of the charging module and the thermal management mechanism, and control the operation of the driving assembly.

[0006] According to an aspect of the embodiment of the present application, the battery system further comprises a temperature sensor arranged on the battery monomer and in communication connection with the controller, the temperature sensor being configured to detect the temperature of the battery monomer; and / or, the battery system further comprises a pressure sensor arranged on the battery monomer and in communication connection with the controller, the pressure sensor being configured to detect the pressure of the battery monomer.

[0007] According to an aspect of the embodiment of the present application, the thermal management mechanism comprises a heat dissipation piece, a plurality of battery monomers are arranged along a first direction, each battery monomer is provided with the heat dissipation piece along at least one side of a second direction, and the first direction intersects the second direction.

[0008] According to one aspect of the present application, the heat sink includes a semiconductor heat sink and a first power supply unit. The semiconductor heat sink is connected to the wall portion, and the first power supply unit is configured to provide electrical energy to the semiconductor heat sink and is communicatively connected to the controller.

[0009] According to one aspect of the embodiments of this application, the thermal management mechanism further includes a heat exchanger, wherein each of the battery cells is provided with the heat exchanger on at least one side along a third direction, and / or, each of the battery cells is provided with the heat exchanger on at least one side along the first direction; the first direction, the second direction, and the third direction intersect each other.

[0010] According to one aspect of the embodiments of this application, each of the battery cells is provided with a plurality of the pressure relief mechanisms.

[0011] According to one aspect of the embodiments of this application, a plurality of battery cells are arranged along a first direction, and each battery cell is provided with the pressure relief mechanism on either side of a second direction, wherein the first direction intersects the second direction.

[0012] According to one aspect of the embodiments of this application, the drive assembly includes a drive member and a telescopic member, the telescopic member being connected to the side of the pressure relief body facing the electrode assembly, the drive member being configured to provide electrical power to the telescopic member and being communicatively connected to the controller.

[0013] According to one aspect of the embodiments of this application, the driving component includes a second power supply unit, a communication interface, and a wire. The communication interface is disposed on the pressure relief body and is communicatively connected to the controller. The communication interface is electrically connected to the second power supply unit through the wire. The second power supply unit is configured to provide electrical energy to the telescopic component.

[0014] On the other hand, an electrical device is proposed according to an embodiment of this application, including the battery system as described above.

[0015] The battery system and electrical device provided in this application include a battery module, a charging module, a thermal management mechanism, a pressure relief mechanism, and a controller. When the temperature of a battery cell becomes abnormal, the controller can control the charging module to shut down to stop charging the battery cell, and can also control the thermal management mechanism to open to cool the battery cell. Furthermore, the controller can control the drive component to operate to drive the pressure relief body to open. By setting up in the above manner, the internal temperature of the battery cell can be suppressed from continuing to rise, thereby delaying or preventing thermal runaway. It can also reduce the damage caused to external components by the internal pressure and temperature released by the pressure relief body, thereby effectively mitigating the adverse effects of thermal runaway on the battery system. Attached Figure Description

[0016] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0017] Figure 1 This is a connection diagram of a battery system according to an embodiment of this application;

[0018] Figure 2 This is an exploded schematic diagram of a single battery cell in a battery system according to an embodiment of this application;

[0019] Figure 3 This is a partial structural diagram of a battery module in a battery system according to an embodiment of this application;

[0020] Figure 4 This is a cross-sectional view of a pressure relief mechanism in a battery system according to an embodiment of this application;

[0021] Figure 5 This is a schematic diagram of the connection of a heat sink in a battery system according to an embodiment of this application.

[0022] in:

[0023] 10. Battery module; 11. Battery cell; 111. Housing; 1101. Shell; 1102. End cap; 1111. Wall; 112. Electrode assembly; 113. Electrode terminal; 114. Injection hole;

[0024] 20. Charging module;

[0025] 30. Thermal management mechanism; 31. Heat sink; 311. Semiconductor heat sink; 3111. Conductive part; 3112. N-type semiconductor; 3113. P-type semiconductor; 3114. First end insulation part; 3115. Second end insulation part; 312. First power supply part; 32. Heat exchanger;

[0026] 40. Pressure relief mechanism; 41. Pressure relief body; 42. Drive assembly; 421. Telescopic component; 422. Drive component; 4221. Second power supply unit; 4222. Communication interface; 4223. Wire;

[0027] 50. Controller;

[0028] X, first direction; Y, second direction; Z, third direction. Detailed Implementation

[0029] The features and exemplary embodiments of various aspects of this application will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a comprehensive understanding of this application. However, it will be apparent to those skilled in the art that this application can be implemented without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of this application by illustrating examples. In the accompanying drawings and the following description, at least some well-known structures and techniques are not shown to avoid unnecessarily obscuring the application; and, for clarity, the dimensions of some structures may be exaggerated. Furthermore, the features, structures, or characteristics described below can be combined in any suitable manner in one or more embodiments.

[0030] The directional terms used in the following description refer to the directions shown in the figures and are not intended to limit the battery system and electrical device of this application. It should also be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0031] The technical solutions described in the embodiments of this application are applicable to battery systems and electrical devices using battery systems.

[0032] Electrical devices can include vehicles, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0033] To better understand this application, the following will be combined with... Figures 1 to 5 The battery system and power-consuming device according to the embodiments of the application will be described in detail.

[0034] With the rapid development of new energy vehicles, battery safety has become a major concern. Batteries are typically equipped with explosion-proof valves. When the battery overheats or experiences excessive pressure, the explosion-proof valve opens under pressure to reduce internal pressure and energy accumulation.

[0035] Although the explosion-proof valves on existing batteries can release pressure, when the explosion-proof valves are opened, the chemical reaction inside the battery has already reached a violent level, which may still have an adverse effect on the overall safety of the battery.

[0036] Based on the above-mentioned deficiencies, this application provides a battery system that can effectively suppress the continued heating of battery cells when the temperature of a single cell becomes abnormal. By controlling the opening of the pressure relief mechanism through a controller, the damage caused to external components by the internal pressure and temperature released by the pressure relief body can be reduced, thereby effectively mitigating the adverse effects of thermal runaway on the battery system.

[0037] Please refer to the following: Figures 1 to 5 This application provides a battery system including a battery module 10, a charging module 20, a thermal management mechanism 30, a pressure relief mechanism 40, and a controller 50. The battery module 10 includes multiple battery cells 11. Each battery cell 11 includes a housing 111 and an electrode assembly 112. The housing 111 includes a wall portion 1111, and the electrode assembly 112 is disposed within the housing 111. The charging module 20 is connected to the battery module 10 and configured to provide electrical energy to the battery cells 11. The thermal management mechanism 30 is disposed on the side of the wall portion 1111 facing away from the electrode assembly 112. The pressure relief mechanism 40 includes a pressure relief body 41 and a driving assembly 42. The pressure relief body 41 is disposed on the wall portion 1111, and the driving assembly 42 is disposed on the pressure relief body 41 and configured to drive the pressure relief body 41 to open. The controller 50 is communicatively connected to the charging module 20, the thermal management mechanism 30, and the drive component 42, and is configured to control the opening and closing of the charging module 20 and the thermal management mechanism 30, as well as the operation of the drive component 42.

[0038] In the battery system provided in this application embodiment, when the temperature of the battery cell 11 is abnormal, the controller 50 can control the charging module 20 to shut down to stop charging the battery cell 11, and can also control the thermal management mechanism 30 to open to cool the battery cell 11. Furthermore, the controller 50 can also control the drive component 42 to operate to drive the pressure relief body 41 to open. By setting up in the above manner, the internal temperature of the battery cell 11 can be suppressed from continuing to rise, thereby effectively mitigating or preventing the occurrence of thermal runaway. This is beneficial to reducing the impact of thermal runaway on the entire battery module 10, and can also reduce the damage caused to external components by the internal pressure and temperature released by the pressure relief body 41, thereby effectively mitigating the adverse effects of thermal runaway on the battery system.

[0039] The battery module 10 can provide electrical energy to the outside world as a power source. Optionally, the number of battery modules 10 can be set to multiple, and each battery module 10 includes multiple battery cells 11, which are arranged in a certain manner. The multiple battery cells 11 can be connected in series, parallel, or in a mixed manner to form the battery module 10. The multiple battery modules 10 can be connected in series, parallel, or in a mixed manner to form a whole.

[0040] It should be noted that, in the embodiments of this application, "multiple" refers to two or more (including two).

[0041] Optionally, the battery cell 11 can be of various shapes, such as cylindrical, prismatic, blade-shaped, etc.

[0042] like Figure 2 As shown, the battery cell 11 includes a housing 111 and an electrode assembly 112. The housing 111 is a component used to form the internal environment of the battery cell 11. The internal environment formed by the housing can be used to house the electrode assembly 112, as well as the electrolyte and other components. The shape of the housing 111 can be determined according to the specific shape of the electrode assembly 112. For example, if the electrode assembly 112 has a cuboid structure, a cuboid housing can be selected; if the electrode assembly 112 has a cylindrical structure, a cylindrical housing can be selected.

[0043] In some embodiments, the housing 111 includes an end cap 1102 and a housing 1101, the housing 1101 having an opening, and the end cap 1102 covering the opening. The housing 1101 may have one or more openings. The end cap 1102 may also be provided one or more.

[0044] In some embodiments, the end cap 1102 may be provided with an injection hole 114, which is used to inject electrolyte into the battery cell 11, release gas, and check the sealing performance.

[0045] Electrode assembly 112 is a component in the battery cell 11 in which an electrochemical reaction occurs, and the housing 111 may contain one or more electrode assemblies 112.

[0046] In some embodiments, the electrode assembly 112 may be cylindrical, flat, or polygonal. The electrode assembly 112 may be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0047] like Figure 2 As shown, the battery cell 11 may further include an electrode terminal 113, which is electrically connected to the tab of the electrode assembly 112 for outputting or inputting electrical energy into the battery cell 11. The electrode terminal 113 may be directly connected to the tab or indirectly connected to the tab through a current collector.

[0048] The charging module 20 is used to provide electrical energy to the battery cell 11. The charging module 20 can be connected to the charging interface of the battery module 10 via a cable or connector to realize the transmission of electrical energy.

[0049] The thermal management mechanism 30 is used to perform thermal management on the battery cell 11 so that the temperature of the battery cell 11 is kept within a preset range, which helps to ensure the safe operation of the battery cell 11.

[0050] The pressure relief mechanism 40 is used to release the internal gas of the battery cell 11 to relieve the pressure inside the casing 1101.

[0051] Optionally, the end cap 1102 may include a wall portion 1111, and the pressure relief body 41 is disposed on the end cap 1102; or, the housing 1101 may include a wall portion 1111, and the pressure relief body 41 is disposed on the housing 1101; or, the wall portion 1111 may have a first wall disposed on the end cap 1102 and a second wall disposed on the housing 1101, and the pressure relief body 41 may be provided in multiple ways, with the end cap 1102 having at least one pressure relief body 41 and the housing 1101 having at least one pressure relief body 41.

[0052] Optionally, the controller 50 can communicate with the charging module 20, the thermal management mechanism 30, and the drive assembly 42 via control signal lines.

[0053] Optionally, the charging module 20, the thermal management mechanism 30, and the drive component 42 are each equipped with a wireless receiving module, and the controller 50 is equipped with a wireless transmitting module. The controller 50 can control the opening and closing of the charging module 20 and the thermal management mechanism 30, as well as the operation of the drive component 42, through wireless transmission.

[0054] The controller 50 is used to control the opening and closing of the charging module 20 and the thermal management mechanism 30, and also to control the operation of the drive assembly 42. Optionally, the controller 50 can be a battery management system (BMS), or it can be a controller within the battery management system.

[0055] In related technologies, the pressure relief body is opened under the action of the internal pressure of the battery cell. It is understandable that when thermal runaway occurs, a violent chemical reaction will occur inside the battery cell, and its internal pressure and temperature will rise sharply. Even if the pressure relief body is opened under pressure, the high temperature and high pressure gas rushed out by the pressure relief body may damage adjacent battery cells or other external components.

[0056] In contrast, the embodiment of this application differs. In this embodiment, the opening of the pressure relief body 41 is controlled by the controller 50. Before the controller 50 controls the opening of the pressure relief body 41, it first controls the charging module 20 to disconnect and the thermal management mechanism 30 to open. That is, when a battery cell 11 malfunctions, the controller 50 controls the charging module 20 to disconnect to stop charging the battery cell 11, preventing the temperature of the malfunctioning battery cell 11 from continuing to rise. Simultaneously, the controller 50 also controls the thermal management mechanism 30 to open to cool and dissipate heat from the battery cell 11, preventing further temperature increases in the malfunctioning battery cell. As the temperature and pressure inside 11 continue to rise, this setting can delay or prevent the occurrence of thermal runaway. Then, the controller 50 will control the drive component 42 to operate and drive the pressure relief body 41 to open, so as to release the internal pressure of the abnormal battery cell 11. After the above operation, the pressure and temperature inside the abnormal battery cell 11 will no longer rise or will rise very slowly. Therefore, the impact of the pressure released by the abnormal battery cell 11 on other battery cells 11 or external components can be greatly reduced, which is conducive to ensuring the overall safety of the battery module 10 and thus effectively mitigating the adverse effects of thermal runaway on the battery system.

[0057] As an optional embodiment, the battery system also includes a temperature sensor disposed on the battery cell 11 and communicatively connected to the controller 50, the temperature sensor being configured to detect the temperature of the battery cell 11.

[0058] The temperature sensor is used to detect the temperature of the battery cell 11 and can send the acquired temperature to the controller 50. The controller 50 controls the charging module 20, the thermal management mechanism 30 and the drive assembly 42 based on the temperature value of the battery cell 11 it receives.

[0059] In its specific implementation, the controller 50 receives a temperature value sent from the temperature sensor. If this temperature value is greater than or equal to a preset abnormal temperature value, it indicates that the temperature of the battery cell 11 is abnormal. The controller 50 controls the charging module 20 to disconnect, controls the thermal management mechanism 30 to turn on, and controls the drive component 42 to move. If this temperature value is less than the preset abnormal temperature value, it indicates that the temperature of the battery cell 11 is normal, and the battery system is operating normally.

[0060] Optionally, each battery cell 11 may be equipped with a temperature sensor, enabling the temperature sensor to detect the temperature of each battery cell 11, thereby ensuring detection accuracy and further improving the reliability of the battery system. The temperature sensor may be located on the side of the battery cell 11 wall 1111 facing away from the electrode terminal 113. Optionally, the temperature sensor may be located on the end cap 1102 or on the housing 1101.

[0061] As an optional embodiment, the battery system also includes a pressure sensor disposed on the battery cell 11 and communicatively connected to the controller 50, the pressure sensor being configured to detect the pressure of the battery cell 11.

[0062] The pressure sensor is used to detect the pressure of the battery cell 11 and can send the temperature it acquires to the controller 50. The controller 50 controls the charging module 20, the thermal management mechanism 30 and the drive assembly 42 according to the pressure value of the battery cell 11 it receives.

[0063] In a specific implementation, the controller 50 receives a pressure value sent from the pressure sensor. If this pressure value is greater than or equal to a preset abnormal pressure value, it indicates that the internal pressure of the battery cell 11 is abnormal. The controller 50 controls the charging module 20 to disconnect, controls the thermal management mechanism 30 to open, and controls the drive component 42 to move. If this pressure value is less than the preset abnormal pressure value, it indicates that the internal pressure of the battery cell 11 is normal, and the battery system is operating normally.

[0064] Optionally, each battery cell 11 is equipped with a pressure sensor, enabling the pressure sensor to detect the pressure of each battery cell 11, thus ensuring detection accuracy. The pressure sensor can be located on the side of the battery cell 11 wall 1111 facing away from the electrode terminal 113. Optionally, the pressure sensor can be located on the end cap 1102 or on the housing 1101.

[0065] As an alternative embodiment, the battery system may be equipped with both temperature and pressure sensors to improve the accuracy of monitoring thermal runaway and further enhance the reliability of the battery system.

[0066] Please see Figure 2 and Figure 3 As an optional embodiment, the thermal management mechanism 30 includes a heat dissipation component 31, a plurality of battery cells 11 are arranged along a first direction X, and each battery cell 11 is provided with a heat dissipation component 31 on at least one side along a second direction Y, wherein the first direction X and the second direction Y intersect.

[0067] In this embodiment of the application, the first direction X can be the width direction of the battery cell 11, the second direction Y can be the length direction of the battery cell 11, and the third direction Z can be the height direction of the battery cell 11.

[0068] By setting it in the above manner, the connection between two adjacent battery cells 11 can be made tighter, and more battery cells 11 can be arranged in the battery module 10 to improve energy density. Furthermore, after multiple battery cells 11 are assembled to form the battery module 10, a heat sink 31 can be arranged on at least one side of the battery module 10 along the second direction Y, so that each battery cell 11 is provided with a heat sink 31 on at least one side along the second direction Y, which facilitates assembly and helps to improve assembly efficiency.

[0069] Optionally, each battery cell 11 is provided with a heat sink 31 on either side of the second direction Y, which helps to improve the heat dissipation effect of the heat sink 31 on the battery cell 11.

[0070] Optionally, a plurality of heat sinks 31 may be provided on either side of the battery cell 11 along the second direction Y, and the plurality of heat sinks 31 are distributed at intervals along the third direction Z, which is beneficial to improving the heat dissipation effect of the heat sinks 31 on the battery cell 11.

[0071] Optionally, the heat sink 31 may include any one of a liquid cooling plate, an air cooling plate, and a semiconductor heat sink.

[0072] Optionally, the heat sink 31 can be attached to the wall 1111 of the battery cell 11 by adhesive bonding.

[0073] Please see Figure 4 As an optional embodiment, the heat sink 31 includes a semiconductor heat sink 311 and a first power supply unit 312. The semiconductor heat sink 311 is connected to the wall portion 1111, and the first power supply unit 312 is configured to provide power to the semiconductor heat sink 311 and communicate with the controller 50.

[0074] The first power supply unit 312 is used to provide electrical energy to the semiconductor heat sink 311. The first power supply unit 312 can be connected to the interface of the semiconductor heat sink 311 via a cable or connector to realize the transmission of electrical energy. The controller 50 is communicatively connected to the first power supply unit 312 and is used to control the first power supply unit 312 to turn on so as to input electrical energy to the semiconductor heat sink 311.

[0075] The semiconductor heat sink 311 is composed of an N-type semiconductor 3112 and a P-type semiconductor 3113. When the controller 50 controls the first power supply unit 312 to be turned on, the current of the first power supply unit 312 can be transferred through the conductive part 3111. The movement of electrons in the N-type semiconductor 3112 and the P-type semiconductor 3113 will cause the first end insulating part 3114 of the semiconductor heat sink 311 to form a cold end and the second end insulating part 3115 to form a hot end. The first end insulating part 3114 is disposed towards the battery cell 11. The first end insulating part 3114 can absorb the battery cell 11, and the second end insulating part 3115 can dissipate heat. Thus, the battery cell 11 can be effectively cooled to prevent its temperature from continuing to rise.

[0076] like Figure 3 As shown, as an optional embodiment, the thermal management mechanism 30 further includes a heat exchanger 32, and each battery cell 11 is provided with a heat exchanger 32 on at least one side along the third direction Z, where the first direction X, the second direction Y and the third direction Z intersect each other.

[0077] The heat exchanger 32 is used for heat exchange with the battery cell 11. The heat exchanger 32 can heat up or cool down the battery cell 11. The heat exchanger 32 can be a liquid cooling plate or an air cooling plate.

[0078] By using the above configuration, thermal management of all battery cells 11 can be achieved using a single heat exchanger 32, which helps reduce costs and also reduces the space occupied by the heat exchanger 32, allowing the battery module 10 to have more battery cells 11, which is beneficial for improving energy density. Furthermore, the heat exchanger 32 can also provide further protection for the bottom of the battery cells 11 to improve the operational safety of the battery cells 11. In addition, by placing the heat sink 31 and the heat exchanger 32 on different surfaces of the battery cells 11, the layout is reasonable and helps to improve the heat dissipation effect of the battery cells 11.

[0079] Optionally, the battery cell 11 is provided with a heat exchange element 32 on the side opposite to the electrode terminal 113 along the third direction Z.

[0080] As an optional embodiment, each battery cell 11 is provided with a heat exchange element 32 on at least one side along the first direction X.

[0081] By setting it up in the above manner, a heat exchanger 32 can be provided between two adjacent battery cells 11, which helps to improve the efficiency of the heat exchanger 32 in thermal management of the battery cells 11, thereby better ensuring the safe operation of the battery cells 11.

[0082] In summary, when the temperature of the battery cell 11 becomes abnormal, the controller 50 can control the heat sink 31 and the heat exchanger 32 to be turned on simultaneously to dissipate heat from the battery cell 11, which can further suppress the abnormal temperature rise of the battery cell 11.

[0083] In some alternative embodiments, each battery cell 11 is provided with multiple pressure relief mechanisms 40. The drive assembly 42 of each pressure relief mechanism 40 is communicatively connected to the controller 50.

[0084] The arrangement of multiple pressure relief mechanisms 40 can improve the fault tolerance and reliability of the battery system. Even if one pressure relief mechanism 40 fails or is damaged and cannot work properly, the other pressure relief mechanisms 40 can still function and can also expel heat and gas from the abnormal battery cell 11 more quickly.

[0085] It is understandable that multiple pressure relief mechanisms 40 are distributed at intervals, and in order to better relieve the internal pressure of the battery cell 11, the multiple pressure relief mechanisms 40 can be respectively arranged on the surface of the battery cell 11 in different directions.

[0086] Please see Figure 2 and Figure 3 In some optional embodiments, multiple battery cells 11 are arranged along a first direction X, and each battery cell 11 is provided with a pressure relief mechanism 40 on either side of a second direction Y, wherein the first direction X intersects with the second direction Y.

[0087] This configuration prevents the pressure released by the pressure relief mechanism 40 from affecting other adjacent battery cells 11. Furthermore, by setting two pressure relief mechanisms 40, the internal pressure of the battery cells 11 can be better released, and costs can be reduced.

[0088] By providing pressure relief mechanisms 40 on both sides of each battery cell 11, the overall safety of the battery module 10 can be greatly improved. Even if a battery cell 11 fails, it can be dealt with quickly, preventing the fault from spreading to other battery cells 11. Since the pressure relief mechanisms 40 are distributed on both sides of the battery cell 11, they are easier to access and operate during maintenance and repair. This helps to reduce maintenance costs and improve maintenance efficiency.

[0089] For example, a pressure relief mechanism 40 and two heat sinks 31 are respectively provided on either side of the battery cell 11 along the second direction Y. The two heat sinks 31 are spaced apart along the third direction Z, and a pressure relief mechanism 40 is provided between the two heat sinks 31 along the third direction Z.

[0090] like Figure 4 As shown, in some alternative embodiments, the drive assembly 42 includes a telescopic member 421 and a drive member 422. The telescopic member 421 is connected to the side of the pressure relief body 41 facing the electrode assembly 112, and the drive member 422 is configured to provide electrical power to the telescopic member 421 and is communicatively connected to the controller 50.

[0091] The drive unit 422 is used to provide electrical power to the telescopic member 421. The drive unit 422 can be connected to the charging interface of the telescopic member 421 via a cable or connector to realize the transmission of electrical power.

[0092] The controller 50 is communicatively connected to the drive unit 422 and is used to control the drive unit 422 to open so as to input electrical energy to the semiconductor telescopic member 421. After the telescopic member 421 is powered on, it can perform telescopic actions to push or pull the pressure relief body 41 so as to open the pressure relief body 41 and realize the pressure relief process.

[0093] Optionally, the drive unit 422 can also be configured to provide power or control signals to the telescopic member 421 to control the telescopic movement of the telescopic member 421.

[0094] Optionally, the drive component 422 can be a power-providing element such as a motor or solenoid valve. Optionally, the telescopic component 421 can be a telescopic rod or telescopic sleeve.

[0095] As an optional embodiment, the drive unit 422 includes a second power supply unit 4221, a communication interface 4222, and a wire 4223. The communication interface 4222 is disposed on the pressure relief body 41 and is communicatively connected to the controller 50. The communication interface 4222 is electrically connected to the second power supply unit 4221 through the wire 4223. The second power supply unit 4221 is configured to provide electrical energy to the telescopic member 421.

[0096] The second power supply unit 4221 is used to provide electrical energy to the telescopic member 421 so that the telescopic member 421 can perform telescopic movements. The second power supply unit 4221 can be a primary battery, which helps to reduce costs.

[0097] The communication interface 4222 is used to receive control signals from the controller 50. The controller 50 sends control signals to the drive unit 422 through the communication interface 4222. After receiving the signal, the drive unit 422 transmits power from the second power supply unit 4221 to the telescopic member 421 through the wire 4223. The telescopic member 421 performs telescopic movement under the drive of the power, thereby controlling the opening of the pressure relief body 41.

[0098] The specific implementation of the pressure relief mechanism 40 is as follows: the temperature sensor can detect the temperature of the battery cell 11 and transmit this temperature to the controller 50 in the form of an electrical signal; the pressure sensor can detect the internal pressure of the battery cell 11 and transmit this pressure to the controller 50 in the form of an electrical signal. When the temperature value received by the controller 50 is greater than or equal to a preset abnormal temperature value, or the pressure value received by the controller 50 is greater than or equal to a preset abnormal pressure value, the controller 50 controls the charging module 20 to disconnect to stop charging the battery cell 11. The controller 50 controls the heat exchange component 32 to open and controls the first power supply unit 312 to energize the semiconductor heat sink 311 to open the heat sink 31, so as to dissipate heat from the battery cell 11 at the same time. The controller 50 also controls the second power supply unit 4221 to energize the telescopic component 421 to push the pressure relief body 41 to open, so as to release the internal pressure of the battery cell 11.

[0099] This application also provides an electrical device, including the battery system provided in the above embodiments.

[0100] The electrical device provided in this application includes a battery system as described in the above embodiments, which can effectively reduce the adverse effects of thermal runaway. Therefore, it can help improve the reliability of the electrical device.

[0101] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery system, characterized in that, include: A battery module includes multiple battery cells, each battery cell including a housing and an electrode assembly, the housing including a wall portion, and the electrode assembly disposed within the housing; A charging module is connected to the battery module and configured to provide electrical energy to the individual battery cells; A thermal management mechanism is disposed on the side of the wall facing away from the electrode assembly; A pressure relief mechanism includes a pressure relief body and a drive assembly. The pressure relief body is disposed on the wall portion, and the drive assembly is disposed on the pressure relief body and configured to drive the pressure relief body to open. The controller is communicatively connected to the charging module, the thermal management mechanism, and the drive component, and is configured to control the opening and closing of the charging module and the thermal management mechanism, as well as the operation of the drive component.

2. The battery system according to claim 1, characterized in that, The battery system further includes a temperature sensor disposed on the battery cell and communicatively connected to the controller, the temperature sensor being configured to detect the temperature of the battery cell; and / or, the battery system further includes a pressure sensor disposed on the battery cell and communicatively connected to the controller, the pressure sensor being configured to detect the pressure of the battery cell.

3. The battery system according to claim 1 or 2, characterized in that, The thermal management mechanism includes a heat dissipation component, a plurality of battery cells are arranged along a first direction, and the heat dissipation component is provided on at least one side of each battery cell along a second direction, wherein the first direction intersects the second direction.

4. The battery system according to claim 3, characterized in that, The heat sink includes a semiconductor heat sink and a first power supply unit. The semiconductor heat sink is connected to the wall portion, and the first power supply unit is configured to provide electrical energy to the semiconductor heat sink and is communicatively connected to the controller.

5. The battery system according to claim 3, characterized in that, The thermal management mechanism further includes a heat exchanger, wherein each of the battery cells is provided with the heat exchanger on at least one side along a third direction, and / or, each of the battery cells is provided with the heat exchanger on at least one side along the first direction; the first direction, the second direction, and the third direction intersect each other.

6. The battery system according to claim 1 or 2, characterized in that, Each of the battery cells is provided with a plurality of the aforementioned pressure relief mechanisms.

7. The battery system according to claim 6, characterized in that, Multiple battery cells are arranged along a first direction, and each battery cell is provided with the pressure relief mechanism on either side of a second direction, wherein the first direction intersects the second direction.

8. The battery system according to claim 1 or 2, characterized in that, The drive assembly includes a drive member and a telescopic member. The telescopic member is connected to the side of the pressure relief body facing the electrode assembly. The drive member is configured to provide electrical power to the telescopic member and is communicatively connected to the controller.

9. The battery system according to claim 8, characterized in that, The drive unit includes a second power supply, a communication interface, and a wire. The communication interface is disposed on the pressure relief body and is connected to the controller. The communication interface is electrically connected to the second power supply through the wire. The second power supply is configured to provide electrical energy to the telescopic member.

10. An electrical appliance, characterized in that, Includes the battery system as described in any one of claims 1 to 9.

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