Battery, electrical device, method and device for preparing battery

Abstract

The embodiments of the present application provide a battery, an electrical device, and a method and apparatus for preparing a battery. The battery includes: a plurality of battery cells, the first wall of the battery cell is provided with a pressure relief mechanism, the pressure relief mechanism is used to actuate when the internal pressure or temperature of the battery cell reaches a threshold value to release the internal pressure; a thermal management component, used to contain a fluid to regulate the temperature of the battery cell; wherein the first surface of the thermal management component is attached to the first wall, and a relief area corresponding to the pressure relief mechanism is provided on the first surface, the relief area is used to provide a deformation space for the pressure relief mechanism when the pressure relief mechanism is actuated, and a destruction auxiliary substance is provided in the relief area, the destruction auxiliary substance is used to assist in destroying the thermal management component when the pressure relief mechanism is actuated, so that the fluid is discharged from the interior of the thermal management component. The battery, electrical device, method and apparatus for preparing a battery according to the embodiments of the present application can enhance the safety of the battery.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery, an electrical device, and a method and device for preparing a battery. Background Art

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of the industry's sustainable development. Battery technology, in turn, is a crucial factor in the development of electric vehicles.

[0003] In the development of battery technology, in addition to improving battery performance, safety is also an issue that cannot be ignored. If battery safety cannot be guaranteed, the battery will be unusable. Therefore, how to enhance battery safety is a technical issue that needs to be addressed urgently in battery technology. Summary of the Invention

[0004] The present application provides a battery, an electrical device, and a method and device for preparing a battery, which can enhance the safety of the battery.

[0005] In a first aspect, a battery is provided, comprising: a plurality of battery cells, wherein a first wall of the battery cell is provided with a pressure relief mechanism, the pressure relief mechanism being used to be actuated when the internal pressure or temperature of the battery cell reaches a threshold value to relieve the internal pressure; a thermal management component being used to contain a fluid to regulate the temperature of the battery cell; wherein a first surface of the thermal management component is attached to the first wall, a avoidance area corresponding to the pressure relief mechanism is provided on the first surface, the avoidance area being used to provide a deformation space for the pressure relief mechanism when the pressure relief mechanism is actuated, and a destruction auxiliary substance being provided in the avoidance area, the destruction auxiliary substance being used to assist in destroying the thermal management component when the pressure relief mechanism is actuated, so as to discharge the fluid from the interior of the thermal management component.

[0006] Therefore, the battery of the embodiment of the present application is provided with a thermal management component below the multiple battery cells, and an avoidance area corresponding to the pressure relief mechanism is provided on the first surface of the thermal management component, and a destruction auxiliary substance is provided in the avoidance area. In this way, when thermal runaway occurs in the battery cell, the pressure relief mechanism is activated, and the destruction auxiliary substance can assist the emissions discharged from the battery cell to destroy the thermal management component, thereby making the thermal management component easier to be destroyed, and then the internal fluid is discharged from the thermal management component in time, and the temperature is reduced in time, especially the temperature of the thermal runaway battery cell is reduced in time, thereby reducing the risk of heat diffusion inside the battery, which not only reduces economic losses, but also ensures people's life safety.

[0007] In some embodiments, the destruction assisting substance is configured to release oxygen under the action of exhaust from the battery cell when the pressure relief mechanism is actuated.

[0008] Since the destruction auxiliary substance can release oxygen under the action of emissions, it can intensify the combustion of the battery cell in thermal runaway, quickly reach the melting temperature of the thermal management component and break through the thermal management component to the greatest extent, thereby cooling it in time.

[0009] In some embodiments, the destruction aid substance comprises at least one of: zinc sulfate, potassium permanganate, and potassium chlorate.

[0010] In some embodiments, the damage assisting substance is configured to release heat under the action of exhaust from the battery cell when the pressure relief mechanism is actuated.

[0011] When the destructive auxiliary substance releases heat under the action of the exhaust, it can accelerate the melting of the thermal management component, thereby destroying the thermal management component over a larger area, thereby achieving a cooling effect.

[0012] In some embodiments, the destruction assisting substance comprises at least one of the following: iron oxide, ferrosoferric oxide, manganese dioxide, vanadium pentoxide, and chromium oxide.

[0013] Considering that the material of the heat management component may be aluminum, the destruction auxiliary substance may be provided based on the thermite reaction.

[0014] In some embodiments, the avoidance area is a through hole on the thermal management component.

[0015] When the avoidance area is a through hole, the exhaust discharged through the pressure relief mechanism can be quickly discharged through the through hole, thereby releasing the internal pressure of the battery cell in thermal runaway more quickly.

[0016] In some embodiments, the damage assisting substance is disposed on a sidewall of the through hole.

[0017] In some embodiments, the avoidance area is a first groove on the thermal management component.

[0018] In some embodiments, the damage assisting substance is disposed on a sidewall of the first groove.

[0019] In some embodiments, the thickness of the destruction auxiliary substance ranges from 3 mm to 10 mm.

[0020] In some embodiments, the destruction auxiliary substance is disposed on the bottom wall of the first groove.

[0021] In some embodiments, the thickness of the destruction-assisting substance is less than or equal to 2 mm.

[0022] In some embodiments, a second groove is provided on the bottom wall of the first groove, and the destruction auxiliary substance is provided on the bottom wall of the second groove.

[0023] In some embodiments, the thickness of the damage assisting substance is less than or equal to the depth of the second groove.

[0024] In some embodiments, the destruction assisting substance is encapsulated in an encapsulating film.

[0025] In some embodiments, the packaging film is adhered and fixed in the avoidance area.

[0026] In some embodiments, the destruction-assisting substance is in powder form.

[0027] In some embodiments, the packaging film is an aluminum-plastic film, a PP film, or a PC film.

[0028] In some embodiments, the thermal management component is made of aluminum.

[0029] In some embodiments, the thermal management component includes a first heat conducting plate and a second heat conducting plate, the first heat conducting plate is located between the first wall and the second heat conducting plate and attached to the first wall, the first area of ​​the first heat conducting plate has a through hole, the second area of ​​the second heat conducting plate corresponds to the first area, and the second area protrudes away from the first heat conducting plate to form the avoidance area.

[0030] In some embodiments, the thermal management component includes a first heat conducting plate and a second heat conducting plate, the first heat conducting plate is located between the first wall and the second heat conducting plate and attached to the first wall, the first area of ​​the first heat conducting plate is provided with a third groove, the third groove is the avoidance area, the second area of ​​the second heat conducting plate corresponds to the first area, the second area is provided with a fourth groove, the third groove is located in the fourth groove, and a flow channel is formed between the side wall of the third groove and the side wall of the fourth groove for accommodating the fluid.

[0031] In a second aspect, an electrical device is provided, comprising: the battery in the first aspect, for providing electrical energy.

[0032] In some embodiments, the electrical device is a vehicle, a ship, or a spacecraft.

[0033] According to a third aspect, a method for preparing a battery is provided, comprising: providing a plurality of battery cells, wherein a first wall of the battery cell is provided with a pressure relief mechanism, wherein the pressure relief mechanism is used to be actuated when the internal pressure or temperature of the battery cell reaches a threshold value to relieve the internal pressure; providing a thermal management component, wherein the thermal management component is used to accommodate a fluid to regulate the temperature of the battery cell; wherein a first surface of the thermal management component is attached to the first wall, and an avoidance area corresponding to the pressure relief mechanism is provided on the first surface, wherein the avoidance area is used to provide a deformation space for the pressure relief mechanism when the pressure relief mechanism is actuated, and a destruction auxiliary substance is provided in the avoidance area, wherein the destruction auxiliary substance is used to assist in destroying the thermal management component when the pressure relief mechanism is actuated, so that the fluid is discharged from the interior of the thermal management component.

[0034] In a fourth aspect, a device for preparing a battery is provided, comprising a module for executing the method of the third aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 This is a schematic structural diagram of a vehicle disclosed in one embodiment of the present application;

[0036] Figure 2 This is a schematic diagram of the exploded structure of a battery disclosed in one embodiment of the present application;

[0037] Figure 3 This is a schematic diagram of a partial structure of a battery module disclosed in one embodiment of the present application;

[0038] Figure 4 This is an exploded view of a battery cell disclosed in one embodiment of the present application;

[0039] Figure 5 This is a schematic diagram of the exploded structure of another battery disclosed in one embodiment of the present application;

[0040] Figure 6 A side view of a battery cell and a thermal management component disclosed in one embodiment of the present application;

[0041] Figure 7 This is an exploded view of a thermal management component disclosed in one embodiment of the present application;

[0042] Figure 8 This is an exploded view of another thermal management component disclosed in one embodiment of the present application;

[0043] Figure 9 A cross-sectional view of a thermal management component disclosed in one embodiment of the present application;

[0044] Figure 10 This is an exploded view of another thermal management component disclosed in an embodiment of the present application;

[0045] Figure 11 A cross-sectional view of a battery cell and a thermal management component disclosed in one embodiment of the present application;

[0046] Figure 12 for Figure 11 A partial enlarged view of

[0047] Figure 13 A cross-sectional view of another battery cell and thermal management component disclosed in an embodiment of the present application;

[0048] Figure 14 for Figure 13 A partial enlarged view of

[0049] Figure 15 A cross-sectional view of another battery cell and thermal management component disclosed in an embodiment of the present application;

[0050] Figure 16 for Figure 15 A partial enlarged view of

[0051] Figure 17 A schematic flow chart of a method for preparing a battery disclosed in one embodiment of the present application;

[0052] Figure 18 This is a schematic block diagram of a device for preparing a battery disclosed in one embodiment of the present application;

[0053] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0054] The following detailed description of the embodiments of the present application is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present application, but are not intended to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

[0055] In the description of this application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating directions or positional relationships, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly perpendicular, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

[0056] The directional words appearing in the following description are all directions shown in the figures, and do not limit the specific structure of this application. In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0057] In this application, battery cells may include primary batteries and secondary batteries, such as lithium-ion batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., which are not limited in this embodiment of the application. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., which are not limited in this embodiment of the application. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, which are not limited in this embodiment of the application.

[0058] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or battery pack. A battery pack generally includes a casing for enclosing one or more battery cells. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0059] A battery cell comprises an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets. The positive electrode sheet comprises a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The current collector uncoated with the positive active material layer protrudes from the current collector coated with the positive active material layer, and the current collector uncoated with the positive active material layer serves as the positive electrode tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide. The negative electrode sheet comprises a negative current collector and a negative active material layer. The negative active material layer is coated on the surface of the negative current collector. The current collector uncoated with the negative active material layer protrudes from the current collector coated with the negative active material layer, and the current collector uncoated with the negative active material layer serves as the negative electrode tab. The negative current collector can be made of copper, and the negative active material can be carbon, silicon, or other materials. In order to ensure that large currents can pass without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation membrane can be PP or PE, etc. In addition, the electrode assembly can be a wound structure or a laminated structure, and the embodiments of the present application are not limited to this. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters such as energy density, cycle life, discharge capacity, and charge and discharge rate. In addition, the safety of the battery also needs to be considered.

[0060] For batteries, the main safety hazards come from the charging and discharging processes. In order to improve the safety performance of the battery, a pressure relief mechanism is generally provided for the battery cell. The pressure relief mechanism refers to an element or component that is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell reaches a predetermined threshold. The predetermined threshold can be adjusted according to different design requirements. The predetermined threshold may depend on one or more materials of the positive electrode plate, negative electrode plate, electrolyte and separator in the battery cell. The pressure relief mechanism can adopt, for example, an element or component that is sensitive to pressure or temperature, that is, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism is actuated, thereby forming a channel for the internal pressure or temperature to be released.

[0061] The term "activation" as used in this application refers to the action of the pressure relief mechanism, which allows the internal pressure and temperature of the battery cell to be released. The action of the pressure relief mechanism may include, but is not limited to, rupturing, tearing, or melting of at least a portion of the pressure relief mechanism. After the pressure relief mechanism is activated, the high-temperature and high-pressure substances inside the battery cell are discharged from the pressure relief mechanism as emissions. In this way, the pressure of the battery cell can be relieved under controllable pressure or temperature, thereby avoiding potentially more serious accidents.

[0062] The emissions from battery cells mentioned in this application include but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0063] The pressure relief mechanism on a battery cell has a significant impact on battery safety. For example, a short circuit or overcharge in a battery cell can cause thermal runaway within the cell, leading to a sudden increase in pressure or temperature. In this situation, the pressure relief mechanism activates to release internal pressure and temperature, preventing explosion or fire.

[0064] In the current design of the pressure relief mechanism, the main focus is on releasing the high pressure and high heat inside the battery cell, that is, discharging the emissions to the outside of the battery cell. However, in order to ensure the output voltage or current of the battery, multiple battery cells are often required and the multiple battery cells are electrically connected through a busbar. Specifically, the busbar is used to achieve electrical connection between multiple battery cells, such as parallel or series or mixed connection. The busbar can achieve electrical connection between battery cells by connecting the electrode terminals of the battery cells. In some embodiments, the busbar can be fixed to the electrode terminals of the battery cell by welding. Corresponding to the "high-pressure chamber", the electrical connection formed by the busbar can also be called a "high-voltage connection".

[0065] Emissions from within a battery cell can potentially short-circuit other cells. For example, if discharged metal shavings electrically connect two busbars, this can cause a short circuit in the battery, posing a safety hazard. Furthermore, high-temperature, high-pressure emissions are discharged toward the pressure relief mechanism within the battery cell, and more specifically, toward the area where the pressure relief mechanism is activated. These emissions can be powerful and destructive, potentially even capable of breaching one or more structures in that direction, creating further safety concerns.

[0066] In view of this, a thermal management component can be set in the battery, and the surface of the thermal management component is attached to the surface of the battery cell where the pressure relief mechanism is provided. In addition, an avoidance area can also be provided on the thermal management component, which can provide deformation space for the pressure relief mechanism when the pressure relief mechanism is actuated.

[0067] On the one hand, the thermal management component is used to accommodate fluid to regulate the temperature of multiple battery cells. The fluid here can be a liquid or a gas, and regulating the temperature means heating or cooling multiple battery cells. In the case of cooling or lowering the temperature of the battery cells, the thermal management component is used to accommodate cooling fluid to lower the temperature of multiple battery cells. At this time, the thermal management component can also be called a cooling component, a cooling system or a cooling plate, etc., and the fluid it accommodates can also be called a cooling medium or a cooling fluid, more specifically, it can be called a coolant or a cooling gas. In addition, the thermal management component can also be used for heating to increase the temperature of multiple battery cells, which is not limited in the embodiments of the present application. Optionally, the fluid can be circulating to achieve a better temperature regulation effect. Optionally, the fluid can be water, a mixture of water and ethylene glycol, or air, etc.

[0068] On the other hand, when the pressure relief mechanism is actuated, the avoidance area provides deformation space for the pressure relief mechanism, allowing the pressure relief mechanism to open smoothly to release the emissions within the battery cell; and, since the thermal management component contains fluid, the fluid can also cool the battery cell to avoid explosion of the battery cell. For example, the emissions within the battery cell may damage the thermal management component, causing the fluid inside it to flow out, thereby cooling the battery cell.

[0069] Therefore, in order to ensure that after the pressure relief mechanism of a battery cell in thermal runaway is actuated, the emissions discharged from the battery cell can destroy the thermal management component, so that the fluid in the thermal management component flows out and achieves the effect of extinguishing the fire and cooling, an auxiliary destructive substance is provided in the avoidance area of ​​the thermal management component in the embodiment of the present application. The auxiliary destructive substance can assist in destroying the thermal management component when the pressure relief mechanism is actuated.

[0070] The technical solutions described in the embodiments of the present application are applicable to various battery-using devices, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, electric vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0071] It should be understood that the technical solutions described in the embodiments of the present application are not limited to the devices described above, but can also be applied to all devices using batteries. However, for the sake of simplicity, the following embodiments are explained using electric vehicles as an example.

[0072] For example, Figure 1As shown, it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery 10 can be provided inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 40. For example, a battery 10 can be provided at the bottom, front or rear of the vehicle 1. The battery 10 can be used to power the vehicle 1. For example, the battery 10 can be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements of the vehicle 1 during startup, navigation and operation. In another embodiment of the present application, the battery 10 can not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0073] To meet different power requirements, a battery can include multiple battery cells, which can be connected in series, parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections. A battery can also be referred to as a battery pack. Alternatively, multiple battery cells can be connected in series, parallel, or in a hybrid configuration to form a battery module, which can then be connected in series, parallel, or in a hybrid configuration to form a battery. In other words, multiple battery cells can be directly combined into a battery, or they can be first combined into a battery module, which can then be combined into a battery module.

[0074] For example, Figure 2 As shown in FIG. 1 , a schematic diagram of the structure of a battery 10 according to an embodiment of the present application is shown. The battery 10 may include at least one battery module 200. The battery module 200 includes a plurality of battery cells 20. The battery 10 may also include a box body, the interior of the box body is a hollow structure, and the plurality of battery cells 20 are accommodated in the box body. Figure 2 As shown, the box body may include two parts, which are respectively referred to as a first part 111 and a second part 112, and the first part 111 and the second part 112 are buckled together. The shapes of the first part 111 and the second part 112 may be determined according to the shape of the battery module 200. At least one of the first part 111 and the second part 112 has an opening. For example, Figure 2 As shown, the first part 111 and the second part 112 can both be hollow cuboids and each have only one open face. The opening of the first part 111 and the opening of the second part 112 are arranged opposite to each other, and the first part 111 and the second part 112 are buckled together to form a box with a closed chamber. For another example, different from Figure 2As shown, only one of the first portion 111 and the second portion 112 can be a hollow rectangular parallelepiped with an opening, while the other can be plate-shaped to cover the opening. For example, in this example, the second portion 112 is a hollow rectangular parallelepiped with only one open face, and the first portion 111 is plate-shaped. Then, the first portion 111 covers the opening of the second portion 112 to form a box with a closed chamber, which can be used to accommodate multiple battery cells 20. The multiple battery cells 20 are connected in parallel, series, or mixed and then placed in the box formed by the first portion 111 and the second portion 112 being fastened together.

[0075] Optionally, the battery 10 may also include other structures, which will not be described in detail here. For example, the battery 10 may also include a busbar component, which is used to achieve electrical connection between multiple battery cells 20, such as parallel, series, or mixed connection. Specifically, the busbar component can achieve electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Furthermore, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the box through the conductive mechanism.

[0076] The number of battery cells 20 in the battery module 200 can be set to any value according to different power requirements. Multiple battery cells 20 can be connected in series, parallel or mixed to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery 10 may be large, in order to facilitate installation, the battery cells 20 are grouped and each group of battery cells 20 constitutes a battery module 200. The number of battery cells 20 included in the battery module 200 is not limited and can be set according to requirements. For example, Figure 3 is an example of a battery module 200. The battery may include a plurality of battery modules 200, and these battery modules 200 may be connected in series, in parallel, or in a mixed manner.

[0077] Figure 4This is a schematic structural diagram of a battery cell 20 according to an embodiment of the present application. The battery cell 20 includes one or more electrode assemblies 22, a shell 211 and a cover plate 212. The shell 211 and the cover plate 212 form an outer shell 21. The walls of the shell 211 and the cover plate 212 are both referred to as walls of the battery cell 20. The shell 211 is determined according to the shape of the one or more electrode assemblies 22 after being combined. For example, the shell 211 can be a hollow cuboid, a cube, or a cylinder, and one of the faces of the shell 211 has an opening so that one or more electrode assemblies 22 can be placed in the shell 211. For example, when the shell 211 is a hollow cuboid or a cube, one of the planes of the shell 211 is an open face, that is, the plane does not have a wall, so that the inside and outside of the shell 211 are in communication. When the shell 211 can be a hollow cylinder, the end face of the shell 211 is an open face, that is, the end face does not have a wall, so that the inside and outside of the shell 211 are in communication. The cover plate 212 covers the opening and is connected to the housing 211 to form a closed cavity for placing the electrode assembly 22. The housing 211 is filled with an electrolyte, such as an electrolyte solution.

[0078] The battery cell 20 may also include two electrode terminals 214, which may be disposed on the cover plate 212. The cover plate 212 is generally in the form of a flat plate, with the two electrode terminals 214 fixed to the flat surface of the cover plate 212. The two electrode terminals 214 are respectively a first electrode terminal 214a and a second electrode terminal 214b. The two electrode terminals 214 have opposite polarities. For example, when the first electrode terminal 214a is a positive electrode terminal, the second electrode terminal 214b is a negative electrode terminal. Each electrode terminal 214 is provided with a corresponding connecting member 23, which is located between the cover plate 212 and the electrode assembly 22 and is used to electrically connect the electrode assembly 22 and the electrode terminal 214.

[0079] like Figure 4 As shown, each electrode assembly 22 has a first electrode tab 221a and a second electrode tab 222a. The polarity of the first electrode tab 221a and the second electrode tab 222a are opposite. For example, when the first electrode tab 221a is a positive electrode tab, the second electrode tab 222a is a negative electrode tab. The first electrode tab 221a of one or more electrode assemblies 22 is connected to one electrode terminal via a connecting member 23, and the second electrode tab 222a of one or more electrode assemblies 22 is connected to another electrode terminal via another connecting member 23. For example, the positive electrode terminal 214a is connected to the positive electrode tab via one connecting member 23, and the negative electrode terminal 214b is connected to the negative electrode tab via another connecting member 23.

[0080] In the battery cell 20, the electrode assembly 22 can be provided as a single one or multiple ones according to actual use requirements. Figure 4 As shown, four independent electrode assemblies 22 are provided in the battery cell 20 .

[0081] like Figure 4 As shown, a pressure relief mechanism 213 may be further provided on a wall of the battery cell 20 . For example, the pressure relief mechanism 213 may be provided on the first wall 21 a of the battery cell 20 . Figure 4 The first wall 21a is separated from the housing 211. Specifically, the housing 211 has an opening on its bottom side. The first wall 21a covers the bottom opening and is connected to the housing 211 by welding, gluing, or other methods. Alternatively, the first wall 21a and the housing 211 may be integrally formed. The pressure relief mechanism 213 is activated to relieve the internal pressure or temperature of the battery cell 20 when the internal pressure or temperature reaches a threshold.

[0082] The pressure relief mechanism 213 can be part of the first wall 21a or a separate structure from the first wall 21a, secured to the first wall 21a by, for example, welding. When the pressure relief mechanism 213 is part of the first wall 21a, for example, it can be formed by providing a notch in the first wall 21a, with the thickness of the first wall 21a corresponding to the notch being less than the thickness of the pressure relief mechanism 213 in areas other than the notch. The notch is the weakest point of the pressure relief mechanism 213. When excessive gas generated by the battery cells 20 causes the pressure inside the housing 211 to rise and reach a threshold, or when heat generated by reactions within the battery cells 20 causes the temperature inside the battery cells 20 to rise and reach a threshold, the pressure relief mechanism 213 can rupture at the notch, opening the housing 211 to the outside. The gas pressure and temperature are released outward through the rupture of the pressure relief mechanism 213, thereby preventing the battery cells 20 from exploding.

[0083] Optionally, in one embodiment of the present application, Figure 4 As shown, when the pressure relief mechanism 213 is provided on the first wall 21 a of the battery cell 20 , the electrode terminal 214 is provided on the second wall of the battery cell 20 , which is different from the first wall 21 a .

[0084] Optionally, the second wall is disposed opposite to the first wall 21 a. For example, the first wall 21 a may be the bottom wall of the battery cell 20, and the second wall may be the cover plate 212 of the battery cell 20.

[0085] By arranging the pressure relief mechanism 213 and the electrode terminal 214 on different walls of the battery cell 20, when the pressure relief mechanism 213 is actuated, the discharge of the battery cell 20 can be further away from the electrode terminal 214, thereby reducing the impact of the discharge on the electrode terminal 214 and the busbar component, thereby enhancing the safety of the battery.

[0086] Furthermore, when the electrode terminals 214 are disposed on the cover plates 212 of the battery cells 20, the pressure relief mechanisms 213 are disposed on the bottom walls of the battery cells 20. This allows the discharge of the battery cells 20 to be discharged toward the bottom of the battery 10 when the pressure relief mechanisms 213 are activated. This not only reduces the danger of discharge by utilizing the thermal management components at the bottom of the battery 10, but also reduces the risk of damage to passengers when the battery 10 is installed in a vehicle, as the bottom of the battery 10 is generally away from passengers.

[0087] The pressure relief mechanism 213 may be of various possible pressure relief structures, which are not limited in the present embodiment. For example, the pressure relief mechanism 213 may be a temperature-sensitive pressure relief mechanism configured to melt when the internal temperature of the battery cell 20 equipped with the pressure relief mechanism 213 reaches a threshold; and / or the pressure relief mechanism 213 may be a pressure-sensitive pressure relief mechanism configured to rupture when the internal pressure of the battery cell 20 equipped with the pressure relief mechanism 213 reaches a threshold.

[0088] In order to regulate the temperature of the battery cell 20, a thermal management component can be provided below the battery cell 20. Specifically, the thermal management component can be used to contain a fluid to regulate the temperature of the battery cell 20. When the pressure relief mechanism 213 is actuated, the thermal management component can cool the exhaust from the battery cell 20 provided with the pressure relief mechanism 213.

[0089] Figure 5 Another exploded view of the battery 10 according to an embodiment of the present application is shown. Figure 5 As shown, the battery 10 includes: a plurality of battery cells 20, wherein, for any battery cell in the plurality of battery cells 20, the first wall 21a of the battery cell 20 is provided with a pressure relief mechanism 213, and the pressure relief mechanism 213 is used to actuate when the internal pressure or temperature of the battery cell 20 reaches a threshold value to release the internal pressure. Optionally, any battery cell in the plurality of battery cells 20 can be as follows Figure 4 In the battery cell shown, the first wall 21 a of the battery cell 20 is the bottom wall of the housing 211 where the pressure relief mechanism 213 is located, but the embodiment of the present application is not limited thereto.

[0090] like Figure 5As shown, the battery 10 further includes a thermal management component 13 for containing fluid to regulate the temperature of the battery cells 20. Specifically, the first surface of the thermal management component 13 is attached to the first wall 21a and is provided with an escape area 131 corresponding to the pressure relief mechanism 213. The escape area 131 is used to provide deformation space for the pressure relief mechanism 213 when the pressure relief mechanism 213 is actuated. Furthermore, a destruction-assisting substance 1311 is provided within the escape area 131. The destruction-assisting substance 1311 is used to assist in destroying the thermal management component 13 when the pressure relief mechanism 213 is actuated, thereby allowing the fluid to be discharged from the interior of the thermal management component 13.

[0091] Therefore, the battery 10 of the embodiment of the present application is provided with a thermal management component 13 below the plurality of battery cells 20. An escape area 131 corresponding to the pressure relief mechanism 213 is provided on the first surface of the thermal management component 13, and a destruction auxiliary substance 1311 is provided in the escape area 131. In this way, when thermal runaway occurs in the battery cell 20, the pressure relief mechanism 213 is actuated, and the destruction auxiliary substance 1311 can assist the emissions discharged from the battery cell 20 to destroy the thermal management component 13, thereby making it easier for the thermal management component 13 to be destroyed, thereby allowing the internal fluid to be discharged from the thermal management component 13 in a timely manner and cooled in a timely manner. In particular, the temperature of the thermal runaway battery cell 20 is reduced in a timely manner, thereby reducing the risk of heat diffusion inside the battery 10, which not only reduces economic losses but also ensures people's life safety.

[0092] The destruction auxiliary substance 1311 of the embodiment of the present application can be selected according to the actual application. Optionally, the destruction auxiliary substance 1311 can be selected as a substance that can release oxygen under the action of the exhaust of the battery cell 20 when the pressure relief mechanism 213 is actuated. Specifically, considering that when the battery cell 20 has thermal runaway, the pressure relief mechanism 213 is actuated, releasing a large amount of heat, and at the same time, combustion can also occur, therefore, a substance that can react and release oxygen under high temperature conditions can be selected, so that the released oxygen promotes the combustion of the thermal runaway battery cell 20, thereby increasing the temperature of the thermal management component 13. In particular, the local temperature of the avoidance area 131 where the destruction auxiliary substance 1311 is located can be increased, thereby increasing the area of ​​the area that is broken and melted on the thermal management component 13, so that the internal fluid can flow out in time, thereby achieving a cooling effect.

[0093] For example, the auxiliary destruction substance 1311 may include at least one of the following: zinc sulfate, potassium permanganate, and potassium chlorate. Zinc sulfate, at high temperatures, undergoes the following reaction: 2ZnSO4 = 2ZnO + 2SO2 + O2, thereby releasing oxygen. Potassium permanganate, at high temperatures, undergoes the following reaction: 2KMnO4 = K2MnO4 + MnO2 + O2. Potassium chlorate, at high temperatures, undergoes the following reaction: 2KClO3 = 2KCl + 3O2.

[0094] Optionally, the destruction auxiliary substance 1311 may also be a substance that can release heat under the action of the exhaust of the battery cell 20 when the pressure relief mechanism 213 is actuated. For example, considering that the material of the thermal management component 13 can generally be aluminum, the destruction auxiliary substance 1311 can be selected based on the thermite reaction. For example, the destruction auxiliary substance 1311 may include at least one of the following: iron oxide, ferroferric oxide, manganese dioxide, vanadium pentoxide, and chromium oxide. In this way, through the thermite reaction (redox reaction), aluminum is oxidized to aluminum oxide and can release a large amount of heat, so that a large area of ​​the thermal management component 13 can be melted instantly by high temperature, so that the outflowing internal fluid can achieve the purpose of localized rapid cooling of the battery 10.

[0095] Optionally, the destruction assisting substance 1311 in the embodiment of the present application can be in powder form. It should be understood that when a powdered destruction assisting substance 1311 is selected, to facilitate placement within the avoidance zone and to prevent it from impacting other components, the destruction assisting substance 1311 can be wrapped in an encapsulating film. Specifically, the encapsulating film can be an aluminum-plastic film, PP film, or PC film, or other low-melting-point materials. The encapsulated destruction assisting substance 1311 can be adhered and fixed to the avoidance zone 131 via the external encapsulating film, thereby securing the destruction assisting substance 1311.

[0096] The avoidance cavity 131 and the destruction auxiliary substance 1311 of the heat management component 13 of the embodiment of the present application will be described in detail below with reference to the accompanying drawings.

[0097] Figure 6 FIG2 shows a side view of a battery 10 in an embodiment of the present application after multiple battery cells 20 and a thermal management component 13 are installed. Figure 7 and Figure 8 Schematic diagrams of various possible decompositions of the thermal management component 13 of the embodiment of the present application. Figures 6 to 8 As shown, the heat management component 13 of the embodiment of the present application may include a first heat conducting plate 133 and a second heat conducting plate 134 , wherein the first heat conducting plate 133 is located between the first wall 21 a and the second heat conducting plate 134 and attached to the first wall 21 a .

[0098] It should be understood that the thermal management component 13 of the embodiment of the present application can be provided with a flow channel 132 for accommodating fluid. Optionally, the location of the flow channel 132 can be set according to the actual application. For example, Figures 5 to 8 As shown, the flow channel 132 can be provided around the avoidance area 131, for example, on both sides of the avoidance area 131, and the flow channel 132 can also extend along the arrangement direction of the plurality of battery cells 20. For another example, the flow channel 132 can be formed by providing a groove on the second heat conducting plate 134, that is, the second heat conducting plate 134 is provided with a groove opening toward the first heat conducting plate 133 to form the flow channel 132. For another example, the size of the flow channel 132 can be set according to the size of the thermal management component 13, the battery 10, and the battery cell 20, but the embodiments of the present application are not limited thereto.

[0099] Optionally, the number of avoidance areas 131 of the thermal management component 13 of the embodiment of the present application can be set according to actual application. For example, for any avoidance area 131 of the thermal management component 13, it can correspond to one or more pressure relief mechanisms 213, but the embodiment of the present application is not limited thereto.

[0100] Optionally, Figure 7 For example, the avoidance area 131 of the embodiment of the present application can correspond to the pressure relief mechanism 213 one to one, that is, each avoidance area 131 corresponds to one pressure relief mechanism 213. Specifically, the size and shape of the avoidance area 131 can be set according to the size and shape of the pressure relief mechanism 213. For example, the shape of the avoidance area 131 can be consistent with the shape of the pressure relief mechanism 213, and the area of ​​the avoidance area 131 is generally larger than the area of ​​the pressure relief mechanism 213. Figure 7 For example, considering that the pressure relief mechanism 213 can usually be set to be similar to an elliptical runway, the avoidance area 131 can also be consistent with the pressure relief mechanism 213 and also set to be Figure 7 The runway shape shown is, but the embodiments of the present application are not limited to this.

[0101] Optionally, Figure 5 or Figure 8 For example, the avoidance area 131 of the embodiment of the present application can also correspond to multiple pressure relief mechanisms 213. For example, each avoidance area 131 can correspond to multiple pressure relief mechanisms 213 located in the same column. Specifically, Figure 8As shown, considering that the multiple battery cells 20 included in the battery 10 can be arranged in multiple columns of battery cells 20, the multiple battery cells 20 in the same column can correspond to the same avoidance area 131, and the avoidance area 131 can be elongated. For example, the extension direction of the avoidance area 131 can be consistent with the extension direction of the flow channel 132. In addition, the width of the avoidance area 131 is greater than or equal to the width of the pressure relief mechanism 213, but the embodiments of the present application are not limited to this.

[0102] It should be understood that the avoidance area 131 of the embodiment of the present application can be a through hole or a groove. Specifically, if the avoidance area 131 is a through hole, then the first area on the first heat conducting plate 133 corresponding to the pressure relief mechanism 213 and the second area on the second heat conducting plate 134 corresponding to the first area both include through holes to form the avoidance area 131.

[0103] Alternatively, if the avoidance area 131 is a groove, the groove serving as the avoidance area 131 can be formed in a variety of ways. For example, Figure 7 or Figure 8 As shown, the first area on the first heat conducting plate 133 corresponding to the pressure relief mechanism 213 may include a through hole 1331, and the second area of ​​the second heat conducting plate 134 corresponds to the first area. The second area protrudes away from the first heat conducting plate 133 to form a groove, which is referred to as the fourth groove 1341. The fourth groove 1341 is the avoidance area 131.

[0104] For another example, the groove-shaped avoidance area 131 may be formed in other ways. Figure 9 FIG1 shows a cross-sectional view of the heat management component 13 of the embodiment of the present application, and the avoidance area 131 can also be formed by overlapping two grooves. Specifically, as Figure 9 As shown, the first region of the first heat conducting plate 133 is provided with a third groove 1332, which serves as the avoidance region 131. The second region of the second heat conducting plate 134 corresponds to the first region, and the second region is provided with a fourth groove 1341. The third groove 1332 is located within the fourth groove 1341, i.e., the size of the fourth groove is larger than that of the third groove 1332. Optionally, the bottom wall of the third groove 1332 may be provided with a through hole to reduce the bottom wall area of ​​the avoidance region 131, thereby making the avoidance region 131 more easily damaged.

[0105] In addition, a flow channel 132 for accommodating fluid may be formed between the sidewalls of the third groove 1332 and the sidewalls of the fourth groove 1341. Thus, when the pressure relief mechanism 213 is actuated, the flow channel 132 can be more directly destroyed by destroying the sidewalls of the third groove 1332, allowing the fluid in the flow channel 132 to flow out, thereby achieving a cooling effect.

[0106] In the embodiment of the present application, if the avoidance area 131 is a through hole, the destruction auxiliary substance 1311 can be set on the side wall of the through hole. If the avoidance area 131 is a groove, the destruction auxiliary substance 1311 can be set on the bottom wall or side wall of the groove. For the sake of convenience, the following description is taken as an example of the avoidance area 131 being a groove, that is, a first groove is provided on the thermal management component 13, and the first groove is the avoidance area 131. Then, when the avoidance area 131 is a through hole, the manner in which the destruction auxiliary substance 1311 is set on the side wall of the through hole can be the same as the manner in which it is set on the side wall of the groove, and no further details will be given here.

[0107] In addition, for the sake of convenience, the following mainly uses Figure 8 The avoidance area 131 shown is used as an example for description. In this case, the first area of ​​the first heat conducting plate 133 of the thermal management component 13 corresponding to the pressure relief mechanism 213 may include a through hole 1331. The second area of ​​the second heat conducting plate 134 corresponds to the first area, and the second area protrudes away from the first heat conducting plate 133 to form a groove. The first groove of the avoidance area 131 is the fourth groove 1341 on the second heat conducting plate 134.

[0108] Optionally, as an embodiment, the destruction assisting substance 1311 may be disposed on the sidewall of the first groove 1341. Specifically, the destruction assisting substance 1311 may be directly disposed on the surface of the sidewall of the first groove 1341, or a groove may be provided on the sidewall of the first groove 1341 to accommodate the destruction assisting substance 1311 in the groove.

[0109] Optionally, in the case where the destruction auxiliary substance 1311 is disposed in a groove on the side wall of the first groove 1341, Figure 10 shows an exploded view of the thermal management component 13, Figure 11 A cross-sectional view of a battery cell 20 and a thermal management component 13 is shown, for example, Figure 6 The cross-sectional view in the direction of A-A' is shown in FIG. Figure 12 for Figure 11 A partial enlarged view of area A in the middle. Figures 10 to 12 As shown, a groove, referred to herein as a fifth groove, may be provided on the sidewall of the first groove 1341 serving as the avoidance area 131. The fifth groove opens toward the interior of the first groove 1341 to accommodate the auxiliary destruction substance 1311. Optionally, one or more fifth grooves may be provided within any first groove 1341 to accommodate the auxiliary destruction substance 1311.

[0110] It should be understood that the width of the avoidance area 131 can be set to be greater than the width of the pressure relief mechanism 213, so that even if a large amount of auxiliary destruction material 1311 is provided, the opening of the pressure relief mechanism 213 will not be affected. For example, the thickness of the auxiliary destruction material 1311 can generally be set in the range of 3 mm to 10 mm. When the sidewall of the first groove 1341 is provided with a fifth groove, the depth of the fifth groove can be set according to the thickness of the auxiliary destruction material 1311. For example, the depth of the fifth groove can be set to be greater than the thickness of the auxiliary destruction material 1311.

[0111] Optionally, as another embodiment, the auxiliary destruction substance 1311 may also be disposed on the bottom wall of the first groove 1341. Specifically, similar to being disposed on the sidewalls of the first groove 1341, the auxiliary destruction substance 1311 may be disposed on the surface of the bottom wall of the first groove 1341, or a groove may be further provided on the bottom wall of the first groove 1341 to accommodate the auxiliary destruction substance 1311.

[0112] It should be understood that in the case where the destruction auxiliary substance 1311 is disposed on the surface of the bottom wall of the first groove 1341, Figure 13 A cross-sectional view of a battery cell 20 and a thermal management component 13 is shown, for example, Figure 6 The cross-sectional view in the direction of A-A' is shown in FIG. Figure 14 Shown Figure 13 A partial enlarged view of area B in the middle. Figure 13 and Figure 14 As shown, the destruction auxiliary substance 1311 can be set on the surface of the bottom wall of the first groove 1341.

[0113] In the case where the destruction auxiliary substance 1311 is disposed in the groove of the bottom wall of the first groove 1341, Figure 15 A cross-sectional view of a battery cell 20 and a thermal management component 13 is shown, for example, Figure 6 The cross-sectional view in the direction of A-A' is shown in FIG. Figure 16 Shown Figure 15 A partial enlarged view of area C in the middle. Figure 15 and Figure 16 As shown, one or more second grooves 1342 may be provided on the bottom wall of the first groove 1341 , so that the destruction auxiliary substance 1311 is disposed in the second groove 1342 , for example, on the bottom wall of the second groove 1342 .

[0114] Alternatively, it is considered that the destruction auxiliary substance 1311 can be in powder form, such as Figures 13 to 16As shown, a packaging film 1312 can be provided on the surface of the damage auxiliary substance 1311 to seal the damage auxiliary substance 1311 and prevent the damage auxiliary substance 1311 from entering other areas and affecting other components. Optionally, the packaging film can be an aluminum-plastic film, a PP film, a PC film, or other low-melting-point materials.

[0115] Optionally, considering that the depth of the first groove 1341 is limited, when the auxiliary destruction material 1311 is disposed on the bottom wall of the first groove 1341, it will occupy space in the depth direction. In order not to affect the deformation space required for the pressure relief mechanism 213 to be actuated, the thickness of the auxiliary destruction material 1311 should be reasonably set. Figures 15 and 16 As shown, the thickness of the destruction auxiliary substance 1311 can be set to be less than or equal to the depth of the second groove 1342. For example, considering that the thickness of the bottom wall of the first groove 1341 is usually less than or equal to 3 mm, the thickness of the destruction auxiliary substance 1311 can be set to be less than or equal to 2 mm. Figures 13 and 14 Considering the deformation space required when the pressure relief mechanism 213 is actuated, the thickness of the destruction auxiliary material 1311 can be set to be less than or equal to 2 mm.

[0116] The battery 10 of the embodiment of the present application is provided with a thermal management component 13 below a plurality of battery cells 20. An escape area 131 corresponding to the pressure relief mechanism 213 is provided on the first surface of the thermal management component 13. A destruction auxiliary substance 1311 is provided in the escape area 131. In this way, when thermal runaway occurs in the battery cell 20, the pressure relief mechanism 213 is actuated, and the destruction auxiliary substance 1311 can be stimulated by the emissions discharged from the battery cell 20 to release a gas that is conducive to combustion or can release more heat, so that the destruction auxiliary substance 1311 can assist in destroying the thermal management component 13, thereby making it easier and larger in area to be destroyed, and further allowing the internal fluid to be discharged from the thermal management component 13 in a timely manner, cooling down in a timely manner, especially timely reducing the temperature of the thermal runaway battery cell 20, to avoid the spread of fire and causing the explosion of the entire battery 10. In addition, when the battery cell 20 catches fire, after the fire weakens and is extinguished, the battery 10 will not further burn and release heat, which is beneficial to cooling the battery 10 and ultimately reducing the risk of thermal expansion within the battery 10. This not only reduces economic losses but also protects people's lives.

[0117] The battery 10 according to an embodiment of the present application is described above. The method and apparatus for preparing the battery 10 according to an embodiment of the present application will be described below. For parts not described in detail, reference can be made to the aforementioned embodiments.

[0118] Figure 17 FIG. 3 is a schematic flow chart of a method 300 for preparing a battery according to an embodiment of the present application. Figure 17 As shown, the method 300 may include: S310, providing a plurality of battery cells, wherein the first wall of the battery cell is provided with a pressure relief mechanism, and the pressure relief mechanism is used to actuate when the internal pressure or temperature of the battery cell reaches a threshold value to release the internal pressure; S320, providing a thermal management component, and the thermal management component is used to accommodate a fluid to regulate the temperature of the battery cell; wherein the first surface of the thermal management component is attached to the first wall, and an avoidance area corresponding to the pressure relief mechanism is provided on the first surface, and the avoidance area is used to provide a deformation space for the pressure relief mechanism when the pressure relief mechanism is actuated, and a destruction auxiliary substance is provided in the avoidance area, and the destruction auxiliary substance is used to assist in destroying the thermal management component when the pressure relief mechanism is actuated, so that the fluid is discharged from the interior of the thermal management component.

[0119] Figure 18 FIG. 4 is a schematic block diagram of a device 400 for preparing a battery according to an embodiment of the present application. Figure 18 As shown, the device 400 may include: a providing module 410. The providing module 410 is used to: provide a plurality of battery cells, wherein the first wall of the battery cell is provided with a pressure relief mechanism, and the pressure relief mechanism is used to be actuated when the internal pressure or temperature of the battery cell reaches a threshold value to release the internal pressure; provide a thermal management component, and the thermal management component is used to contain a fluid to regulate the temperature of the battery cell; wherein the first surface of the thermal management component is attached to the first wall, and an avoidance area corresponding to the pressure relief mechanism is provided on the first surface, and the avoidance area is used to provide a deformation space for the pressure relief mechanism when the pressure relief mechanism is actuated, and a destruction auxiliary substance is provided in the avoidance area, and the destruction auxiliary substance is used to assist in destroying the thermal management component when the pressure relief mechanism is actuated, so that the fluid is discharged from the interior of the thermal management component.

[0120] It should be understood that the method 300 and the device 400 for preparing a battery according to the embodiment of the present application can be used to prepare the battery 10 according to the embodiment of the present application, and for the sake of brevity, they will not be described in detail here.

[0121] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and components may be substituted with equivalents without departing from the scope of the present application. In particular, the various technical features described in the various embodiments may be combined in any manner as long as there are no structural conflicts. The present application is not limited to the specific embodiments disclosed herein, but encompasses all technical solutions within the scope of the claims.

Claims

1. A battery, characterized in that: include: A plurality of battery cells (20), wherein a first wall (21a) of each battery cell (20) is provided with a pressure relief mechanism (213); a thermal management component (13) for containing a fluid to regulate the temperature of the battery cell (20); The first surface of the thermal management component (13) is attached to the first wall (21a), and a relief area (131) corresponding to the pressure relief mechanism (213) is provided on the first surface. The relief area (131) is used to provide a deformation space for the pressure relief mechanism (213) when the pressure relief mechanism (213) relieves pressure. A destruction auxiliary substance (1311) is provided in the relief area (131). The destruction auxiliary substance (1311) is used to assist the exhaust discharged from the battery cell (20) in damaging the thermal management component (13) when the pressure relief mechanism (213) relieves pressure, so that the fluid is discharged from the interior of the thermal management component (13).

2. The battery according to claim 1, characterized in that The destruction auxiliary substance (1311) is used to release oxygen under the action of the exhaust of the battery cell (20) when the pressure relief mechanism (213) releases pressure.

3. The battery according to claim 2, characterized in that The destruction auxiliary substance (1311) includes at least one of the following: zinc sulfate, potassium permanganate and potassium chlorate.

4. The battery according to claim 1, characterized in that The destruction auxiliary substance (1311) is used to release heat under the action of the exhaust of the battery cell (20) when the pressure relief mechanism (213) releases pressure.

5. The battery according to claim 4, characterized in that The destruction auxiliary substance (1311) includes at least one of the following: iron oxide, ferroferric oxide, manganese dioxide, vanadium pentoxide and chromium oxide.

6. The battery according to any one of claims 1 to 5, characterized in that The avoidance area (131) is a through hole on the thermal management component (13).

7. The battery according to claim 6, characterized in that The destruction auxiliary substance (1311) is arranged on the side wall of the through hole.

8. The battery according to any one of claims 1 to 5, characterized in that The avoidance area (131) is a first groove (1341) on the thermal management component (13).

9. The battery according to claim 8, characterized in that The destruction auxiliary substance (1311) is arranged on the side wall of the first groove (1341).

10. The battery according to claim 7, characterized in that The thickness of the destruction auxiliary material (1311) ranges from 3 mm to 10 mm.

11. The battery according to claim 8, characterized in that The destruction auxiliary substance (1311) is arranged on the bottom wall of the first groove (1341).

12. The battery according to claim 11, characterized in that The thickness of the destruction auxiliary material (1311) is less than or equal to 2 mm.

13. The battery according to claim 11, characterized in that A second groove (1342) is provided on the bottom wall of the first groove (1341), and the auxiliary destruction substance (1311) is provided on the bottom wall of the second groove (1342).

14. The battery according to claim 13, characterized in that The thickness of the destruction auxiliary substance (1311) is less than or equal to the depth of the second groove (1342).

15. The battery according to any one of claims 1 to 5, characterized in that The destruction auxiliary substance (1311) is wrapped in a packaging film.

16. The battery according to claim 15, characterized in that The packaging film is adhered and fixed in the avoidance area (131).

17. The battery according to claim 15, characterized in that The destruction auxiliary substance (1311) is in powder form.

18. The battery according to claim 15, characterized in that The packaging film is an aluminum-plastic film, a PP film or a PC film.

19. The battery according to any one of claims 1 to 5, characterized in that The material of the heat management component (13) is aluminum.

20. The battery according to claim 8, characterized in that The heat management component (13) includes a first heat conducting plate (133) and a second heat conducting plate (134), wherein the first heat conducting plate (133) is located between the first wall (21a) and the second heat conducting plate (134) and is attached to the first wall (21a), wherein a first area of ​​the first heat conducting plate (133) has a through hole (1331), and a second area of ​​the second heat conducting plate (134) corresponds to the first area, and the second area protrudes in a direction away from the first heat conducting plate (133) to form the avoidance area (131).

21. The battery according to claim 8, characterized in that The thermal management component (13) includes a first heat conducting plate (133) and a second heat conducting plate (134), wherein the first heat conducting plate (133) is located between the first wall (21a) and the second heat conducting plate (134) and is attached to the first wall (21a), a first area of ​​the first heat conducting plate (133) is provided with a third groove, and the third groove is the avoidance area (131), a second area of ​​the second heat conducting plate (134) corresponds to the first area, and a fourth groove is provided in the second area, and the third groove is located in the fourth groove, and a flow channel (132) is formed between the side wall of the third groove and the side wall of the fourth groove for accommodating the fluid.

22. An electrical device, characterized in that: include: The battery according to any one of claims 1 to 21, wherein the battery is used to provide electrical energy to the electrical device.

23. A method for preparing a battery, characterized in that: include: Providing a plurality of battery cells, wherein a first wall of each battery cell is provided with a pressure relief mechanism; providing a thermal management component, the thermal management component being configured to contain a fluid to regulate the temperature of the battery cell; In which, the first surface of the thermal management component is attached to the first wall, and an avoidance area corresponding to the pressure relief mechanism is provided on the first surface. The avoidance area is used to provide deformation space for the pressure relief mechanism when the pressure relief mechanism releases pressure. A destruction auxiliary substance is provided in the avoidance area. When the pressure relief mechanism releases pressure, the destruction auxiliary substance can assist the emissions discharged from the battery cell to destroy the thermal management component, so that the fluid is discharged from the interior of the thermal management component.

24. A device for preparing a battery, characterized in that: include: A providing module is provided, wherein the providing module is used to: Providing a plurality of battery cells, wherein a first wall of each battery cell is provided with a pressure relief mechanism; providing a thermal management component, the thermal management component being configured to contain a fluid to regulate the temperature of the battery cell; In which, the first surface of the thermal management component is attached to the first wall, and an avoidance area corresponding to the pressure relief mechanism is provided on the first surface. The avoidance area is used to provide deformation space for the pressure relief mechanism when the pressure relief mechanism releases pressure. A destruction auxiliary substance is provided in the avoidance area. When the pressure relief mechanism releases pressure, the destruction auxiliary substance can assist the emissions discharged from the battery cell to destroy the thermal management component, so that the fluid is discharged from the interior of the thermal management component.

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