Battery and electric device

Abstract

The utility model is applicable to the technical field of batteries, and provides a battery and a power utilization device, the power utilization device comprises the battery, the battery comprises a battery monomer and a fire extinguishing structure, the battery monomer comprises a shell assembly, and the shell assembly is provided with a weak structure; the fire extinguishing structure is opposite to the weak structure. The shell assembly comprises a first wall and a pressure relief mechanism connected to the first wall, and the weak structure comprises the pressure relief mechanism; and / or the shell assembly is provided with a welding seam, and the weak structure comprises the welding seam. The fire extinguishing structure which is spaced from and opposite to the weak structure of the battery monomer is arranged on the battery, so that the fire extinguishing structure can be used for cooling and extinguishing fire at at least one of a pressure relief mechanism and a welding seam of the weak structure of the battery monomer so as to reduce the temperature of high-temperature and high-pressure gas generated by thermal runaway of the battery monomer. Therefore, the thermal runaway reaction of the battery monomer generating thermal runaway can be improved, and the thermal spread of the battery monomer is slowed down, so that the thermal runaway of the whole battery can be improved, and the reliability of the battery is improved.

Description

Technical Field

[0001] The present application belongs to the field of battery technology, and more specifically, relates to a battery and an electrical device. Background Art

[0002] In the related art, the battery cells will inevitably generate high temperature rapidly during the thermal runaway process, thereby generating high temperature and high pressure gas and flame, causing the battery cells to thermally runaway. The high temperature and high pressure gas and flame can easily spread to adjacent battery cells, causing a chain reaction of thermal runaway of adjacent battery cells, and then causing thermal runaway of the entire battery. Utility Model Content

[0003] In view of the above problems, the embodiments of the present application provide a battery and an electrical device, which can improve the technical problem of battery thermal runaway.

[0004] In a first aspect, an embodiment of the present application provides a battery, comprising:

[0005] A battery cell, comprising a housing assembly, wherein the housing assembly is provided with a weak structure;

[0006] Fire extinguishing structures are spaced apart from and arranged opposite to weak structures;

[0007] Wherein, the shell component includes a first wall and a pressure relief mechanism connected to the first wall, and the weak structure includes the pressure relief mechanism; and / or, the shell component is formed with a weld, and the weak structure includes the weld.

[0008] The battery provided in the embodiment of the present application is provided with a fire extinguishing structure on the battery that is spaced from and opposite to the weak structure of the battery cell. When the battery cell undergoes thermal runaway, the fire extinguishing structure can cool down and extinguish the high-temperature and high-pressure gas and flame ejected from the weak structure of the battery cell. This can improve the thermal runaway reaction and heat propagation problems of the battery cell, thereby improving the chain reaction problem of thermal runaway of adjacent battery cells, thereby improving the thermal runaway of the battery and improving the reliability of the battery.

[0009] In some embodiments, the pressure relief mechanism includes a pressure relief portion; the first wall is connected to the outer periphery of the pressure relief portion, and at least one fire extinguishing structure is spaced apart from and arranged opposite to the pressure relief portion.

[0010] By spacing and relatively arranging at least one fire extinguishing structure and the pressure relief part, the high-temperature and high-pressure gas and flame generated by the battery cell can be effectively sprayed toward the fire extinguishing structure when sprayed from the pressure relief part. In this way, the fire extinguishing structure can fully contact the high-temperature and high-pressure gas and flame discharged from the battery cell to effectively achieve the cooling and fire extinguishing effect, thereby effectively improving the thermal runaway reaction and heat spread of the battery cell, and further improving the thermal runaway reaction of the entire battery, and improving the reliability of the battery.

[0011] In some embodiments, the pressure relief portion is disposed on the first wall;

[0012] Alternatively, the pressure relief portion is integrally arranged on the first wall, and a first easy-breaking mark is arranged between the first wall and the pressure relief portion;

[0013] Alternatively, the pressure relief mechanism further comprises a connecting portion connected to the first wall, and the pressure relief portion is disposed on the connecting portion;

[0014] Alternatively, the pressure relief mechanism further includes a connecting portion connected to the first wall, the pressure relief portion is integrally arranged on the connecting portion, and a second easy-breaking mark is provided between the pressure relief portion and the connecting portion.

[0015] Such an arrangement allows for a variety of pressure relief mechanisms, making the design very flexible.

[0016] In some embodiments, at least one fire extinguishing structure spaced apart from and arranged opposite to the pressure relief portion is a first fire extinguishing component; on a projection plane perpendicular to the relative direction of the first fire extinguishing component and the pressure relief portion, the projection of the pressure relief portion is located within the projection of the first fire extinguishing component, and in a direction perpendicular to the relative direction of the first fire extinguishing component and the pressure relief portion, the ratio of the size of the first fire extinguishing component to the size of the pressure relief portion is ≥1.2.

[0017] In this way, the orthographic projection of the first fire extinguishing element on the housing assembly covers the pressure relief portion, so that the pressure relief portion can be completely arranged opposite to the first fire extinguishing element. In this way, the high-temperature and high-pressure gas and flame ejected from the pressure relief portion can be ejected to the first fire extinguishing element to a large extent, so that the first fire extinguishing element can effectively cool down and extinguish the high-temperature and high-pressure gas and flame ejected from the pressure relief portion, thereby effectively improving the thermal runaway reaction and heat spread problems of the battery monomer, improving the thermal runaway problem of the battery, and improving the reliability of the battery.

[0018] In some embodiments, at least one fire extinguishing structure is spaced and arranged opposite to the pressure relief mechanism in a one-to-one correspondence;

[0019] And / or, there are multiple pressure relief mechanisms, and at least one fire extinguishing structure is spaced apart from and arranged opposite to the multiple pressure relief mechanisms.

[0020] By adopting the above technical solution, the layout of the fire extinguishing structure in the battery is very flexible.

[0021] In some embodiments, the housing assembly includes a housing and an end cap, wherein the end cap is disposed on the housing to form a space for accommodating the electrode assembly with the housing;

[0022] A first weld is formed between the shell and the end cover, the weld includes the first weld, and at least one fire extinguishing structure is spaced apart from and arranged opposite to the first weld; and / or a second weld is formed on the shell, the weld includes the second weld, and at least one fire extinguishing structure is spaced apart from and arranged opposite to the second weld.

[0023] By adopting the above technical solution, there can be multiple types and positions of welds, and cooling and fire extinguishing can be achieved through the fire extinguishing structure.

[0024] In some embodiments, the end cap is disposed at an end of the housing along the first direction;

[0025] At least one fire extinguishing structure and the first weld are spaced apart and arranged opposite to each other along a first direction; and / or, in a direction perpendicular to the first direction, at least one fire extinguishing structure and the first weld are spaced apart and arranged opposite to each other.

[0026] Such an arrangement makes the relative arrangement of the fire extinguishing structure and the weld very flexible, and the high-temperature and high-pressure gas and flame ejected from different directions through the first weld can be ejected toward the fire extinguishing structure, so as to obtain the effect of cooling and extinguishing the fire through the fire extinguishing structure. In this way, it is helpful to improve the thermal runaway reaction and heat spread of the battery cell, improve the thermal runaway of the battery, and improve the reliability of the battery.

[0027] In some embodiments, at least one fire extinguishing structure is a second fire extinguishing component, and the second fire extinguishing component and the weld are spaced apart and arranged opposite to each other; in the relative direction of the second fire extinguishing component and the weld, the projection width of the second fire extinguishing component on the shell assembly is greater than 4 mm.

[0028] This arrangement makes the orthographic projection of the second fire extinguishing element on the housing assembly have a larger width, so that the second fire extinguishing element can be well opposite to the weld and cover the weld. In this way, the high-temperature and high-pressure gas and flame ejected from the weld can be sprayed toward the second fire extinguishing element, so as to obtain the effect of cooling and extinguishing the fire through the second fire extinguishing element. In this way, it is helpful to improve the thermal runaway reaction and heat spread of the battery cell, improve the thermal runaway of the battery, and improve the reliability of the battery.

[0029] In some embodiments, the battery includes a plurality of battery cells, and the at least one fire extinguishing structure is spaced apart from and disposed opposite to welds of the plurality of battery cells.

[0030] In this way, at least one fire extinguishing structure can be spaced and arranged opposite to the welds of the battery cells in a one-to-many manner, so that the high-temperature and high-pressure gas and flames ejected from the welds of multiple battery cells can be cooled and extinguished. In this way, the layout of the fire extinguishing structure on the battery is facilitated.

[0031] In some embodiments, on a projection plane perpendicular to the relative directions of the weak structure and the fire extinguishing structure, the projection of the weak structure is located within the projection of the fire extinguishing structure.

[0032] This arrangement allows the high-temperature and high-pressure gas and flames ejected from the weak structure during thermal runaway of the battery cell to be effectively sprayed toward the fire extinguishing structure, thereby achieving a cooling and fire extinguishing effect through the fire extinguishing structure. In this way, the thermal runaway reaction and heat spread problems of the battery cell can be improved, thereby improving the thermal runaway of the battery and improving the reliability of the battery.

[0033] In some embodiments, in the relative direction of the fire extinguishing structure and the weak structure, the distance between the fire extinguishing structure and the weak structure is ≥5 mm and ≤15 mm.

[0034] This arrangement allows for a suitable spacing between the fire extinguishing structure and the weak structure, so that the fire extinguishing structure can fully cool down and extinguish the high-temperature and high-pressure gas and flame, and there is a certain exhaust space between the fire extinguishing structure and the weak structure. In this way, the thermal runaway reaction and heat spread of the battery cell can be improved, so as to improve the thermal runaway of the battery and improve the reliability of the battery.

[0035] In some embodiments, in the relative direction of the fire extinguishing structure and the weak structure, the distance between the fire extinguishing structure and the weak structure is ≤10 mm.

[0036] Such an arrangement ensures that there is a suitable distance between the fire extinguishing structure and the weak structure, which is beneficial for the fire extinguishing structure to fully and effectively perform cooling and fire extinguishing operations, and is also beneficial for exhaust.

[0037] In some embodiments, the battery further comprises a heat insulation structure spaced apart from and arranged opposite to the battery cell, and at least one fire extinguishing structure is arranged on the heat insulation structure;

[0038] And / or, the battery further comprises a wiring harness isolation plate spaced apart from and arranged opposite to the battery cell, and at least one fire extinguishing structure is arranged on the wiring harness isolation plate;

[0039] And / or, the battery further comprises a box body, the battery cells are arranged in the box body, and at least one fire extinguishing structure is arranged on the box body.

[0040] By adopting the above technical solution, the fire extinguishing structure can be flexibly arranged at multiple positions of the battery, so that at least one fire extinguishing structure is arranged opposite to the weak structure. In this way, the layout of the fire extinguishing structure on the battery is facilitated.

[0041] In some embodiments, the fire extinguishing structure includes a capsule core for extinguishing fire and a capsule shell for encapsulating the capsule core.

[0042] With such arrangement, when the fire extinguishing structure is in a high temperature environment, the capsule shell of the fire extinguishing structure ruptures, and the capsule core inside the capsule shell can reduce the temperature of the high temperature and high pressure gas and extinguish the flame, thereby achieving a cooling and fire extinguishing effect.

[0043] In some embodiments, the capsule core is a perfluorohexanone capsule core; and / or, the capsule shell is a polymer capsule shell.

[0044] Such arrangement enables the fire extinguishing structure to effectively perform cooling and fire extinguishing operations.

[0045] In a second aspect, an embodiment of the present application provides an electrical device, including a battery.

[0046] The electrical device provided in the embodiment of the present application can improve the thermal runaway of the battery by adopting the above-mentioned battery, so as to improve the reliability of the battery and further improve the reliability of the electrical device.

[0047] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0049] Figure 1 A schematic diagram of a vehicle provided for some embodiments of the present application;

[0050] Figure 2 An exploded schematic diagram of a battery provided in some embodiments of the present application;

[0051] Figure 3 A schematic diagram of a battery provided for some embodiments of the present application;

[0052] Figure 4 for Figure 3 The enlarged view of point A in the middle;

[0053] Figure 5 for Figure 3 A partial three-dimensional structural diagram of the battery provided;

[0054] Figure 6 for Figure 5 Sectional view along BB;

[0055] Figure 7 for Figure 6 Enlarged view of point C in the middle;

[0056] Figure 8 A partial schematic diagram of a battery cell of a battery provided in some embodiments of the present application;

[0057] Fig. 9A schematic diagram of a fire extinguishing structure of a battery provided in some embodiments of the present application;

[0058] Fig.10 Partial three-dimensional structural diagram of batteries provided in other embodiments of the present application;

[0059] Fig.11 for Fig.10 Enlarged view along DD;

[0060] Fig.12 for Fig.11 Enlarged view of point E in the middle;

[0061] Fig.13 The battery provided in some embodiments of the present application is Fig.10 Cross-sectional view of the middle DD;

[0062] Fig.14 for Fig.13 The enlarged view of F in the middle;

[0063] Fig.15 A schematic diagram of the coordination of the fire extinguishing structure and the heat insulation structure of a battery provided in some embodiments of the present application.

[0064] Among them, the reference numerals in the figure are:

[0065] 1000-vehicle; 100-battery; 200-controller; 300-motor; 10-battery cell; 11-electrode assembly; 12-shell assembly; 121-shell; 122-end cover; 1221-first wall; 123-weak structure; 123a-pressure relief mechanism; 1231a-pressure relief part; 1232a-connecting part; 1233a-second easy break mark; 123b-weld; 20-housing; 21-first part; 22-second part; 30-fire extinguishing structure; 30a-first fire extinguishing part; 30b-second fire extinguishing part; 40-thermal insulation structure; W1-first size; W2-second size; W3-third size; W4-fourth size; H1-first distance; H2-second distance; H3-third distance; Z-first direction; X-second direction; Y-third direction. DETAILED DESCRIPTION

[0066] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0067] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0068] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0069] In the description of the present application, "plurality" means more than two, and unless otherwise clearly and specifically defined, "more than two" includes two. Accordingly, "multiple groups" means more than two groups, including two groups.

[0070] In the description of this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like 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 a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0071] In the description of this application, the term "and / or" is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists, A and B exist at the same time, and B exists. In addition, in this application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship.

[0072] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned 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 includes all technical solutions falling within the scope of the claims.

[0073] In the related art, it is inevitable that the battery cells will generate high temperatures rapidly during use, thereby generating high-temperature and high-pressure gas and flames, causing thermal runaway of the battery cells. The high-temperature and high-pressure gas and flames are easy to spread to adjacent battery cells, causing a chain reaction of thermal runaway of adjacent battery cells, and then causing thermal runaway of the entire battery, which makes the battery less reliable.

[0074] A battery cell may include an electrode assembly and a shell assembly, wherein the electrode assembly is disposed in the shell assembly. The shell assembly is generally provided with a relatively weak portion. During thermal runaway of a battery cell, the high-temperature and high-pressure gas and flame generated by the battery cell are likely to break through the relatively weak portion of the shell assembly and eject from the relatively weak portion of the shell assembly.

[0075] Specifically, the shell assembly is formed with a weld and a pressure relief mechanism, which are relatively weak parts of the battery cell. In some cases, during thermal runaway of the battery cell, the high-temperature and high-pressure gas and flame generated are generally directionally relieved through the pressure relief mechanism. If the pressure relief mechanism is not vented in time, the high-temperature and high-pressure gas and flame will also be ejected through the weld. In this way, high-temperature and high-pressure gas and flame will be ejected during the thermal runaway of the battery cell, so that the heat spreads to the adjacent battery cells, causing a chain reaction of thermal runaway of the adjacent battery cells, and then causing the entire battery to have thermal runaway.

[0076] Based on the above considerations, an embodiment of the present application provides a battery and an electrical device, in which a fire extinguishing structure is arranged on the battery, which is spaced from and opposite to the weak structure of the battery cell. During thermal runaway of the battery cell, high-temperature and high-pressure gas and flame ejected from at least one of the pressure relief mechanism and weld of the weak structure of the battery cell can be sprayed toward the fire extinguishing structure, and the fire extinguishing structure can be used to cool and extinguish the fire. In this way, the thermal runaway reaction and heat spread problems of the battery cell can be improved, thereby improving the chain reaction problem of thermal runaway of adjacent battery cells, thereby improving the thermal runaway problem of the battery and improving the reliability of the battery.

[0077] In some embodiments, the battery involved in the embodiments of the present application can be used in an electrical device that uses the battery as a power source.

[0078] The electrical devices involved in the embodiments of the present application may be, but are not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, vehicles, ships, spacecraft, and the like. Among them, electric toys may include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like. Spacecraft may include airplanes, rockets, space shuttles, and spacecraft, and the like. According to the power source, the vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like. According to the drive mode, the vehicle may be a front-wheel drive vehicle, a rear-wheel drive vehicle, or a four-wheel drive vehicle.

[0079] In other embodiments, the battery involved in the embodiments of the present application can also be used in an energy storage system that uses the battery as an energy storage element. Among them, the energy storage system can include an energy storage container, an energy storage cabinet, etc.

[0080] For ease of description, the embodiments of the present application are described using an electrical device as a vehicle as an example.

[0081] In some embodiments, see Figure 1 , and combined with other drawings. Figure 1 Schematic diagram of a vehicle 1000 provided for some embodiments of the present application. The above-mentioned battery 100 is disposed inside the vehicle 1000, and the battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for the starting, navigation, and working power requirements of the vehicle 1000 during driving.

[0082] In some embodiments, the battery 100 can be used not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0083] The battery 100 involved in the embodiment of the present application may be a single physical module including one or more battery cells 10 to provide higher voltage and capacity.

[0084] In some embodiments, the battery 100 may include one battery cell 10 .

[0085] In some embodiments, see Figure 2 , Figure 2The exploded schematic diagram of the battery 100 provided in some embodiments of the present application. The battery 100 may include a plurality of battery cells 10. The plurality of battery cells 10 are connected in series, in parallel or in hybrid connection through a busbar component, wherein the hybrid connection means that the plurality of battery cells 10 are connected in series and in parallel.

[0086] In some embodiments, the battery 100 may be a battery module. When there are multiple battery cells 10, the multiple battery cells 10 are arranged and fixed to form a battery module.

[0087] In some embodiments, the battery 100 may be a battery pack. Figure 2 The battery 100 may include a housing 20 and a battery cell 10. The housing 20 is a structure having a space inside, and the internal space of the housing 20 is used to accommodate the battery cell 10.

[0088] The box 20 can adopt a variety of structures. In some embodiments, the box 20 can include a first part 21 and a second part 22, which cover each other and together define the internal space of the box 20. The first part 21 can be a hollow structure with an opening at one end, and the second part 22 is a plate-like structure, which covers the opening side of the first part 21, so that the first part 21 and the second part 22 together define the internal space of the box 20. Alternatively, please refer to Figure 2 The first part 21 and the second part 22 can both be hollow structures with an opening at one end, and the opening side of the first part 21 covers the opening side of the second part 22, so that the first part 21 and the second part 22 jointly define the internal space of the box body 20. The box body 20 composed of the first part 21 and the second part 22 can be in various shapes, such as a cylinder, a cuboid, etc.

[0089] In some embodiments, see Figure 2 When there are multiple battery cells 10, the multiple battery cells 10 can be connected in series, in parallel or in a mixed connection to form a whole, and then the whole formed by the multiple battery cells 10 is directly accommodated in the internal space of the box 20. In other embodiments, when there are multiple battery cells 10, the multiple battery cells 10 can also be connected in series, in parallel or in a mixed connection first, and arranged and fixed to form a battery module, and the battery module is accommodated in the internal space of the box 20. In some other embodiments, when there are multiple battery cells 10, the multiple battery cells 10 can also be connected in series, in parallel or in a mixed connection first, and arranged and fixed to form multiple battery modules, and the multiple battery modules are then connected in series, in parallel or in a mixed connection to form a whole, and accommodated in the internal space of the box 20.

[0090] As an example, a plurality of battery cells 10 may be fixed by a cable tie or the like to form a battery module.

[0091] As an example, a plurality of battery cells 10 may be fixed by end plates, side plates, etc. to form a battery module.

[0092] In some embodiments, the box 20 of the battery 100 can be used as part of the chassis structure of the vehicle 1000. For example, part of the box 20 can become at least a part of the chassis of the vehicle 1000, or part of the box 20 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0093] The battery cell 10 involved in the embodiment of the present application refers to the smallest unit for storing and outputting electric energy. The battery cell 10 may be a secondary battery or a primary battery. The battery cell 10 may be, but is not limited to, a metal battery, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell 10 may be cylindrical, flat, rectangular, or in other shapes.

[0094] In some embodiments, please refer to Figure 5 and Figure 6 , Figure 5 A partial three-dimensional structural diagram of a battery provided in some embodiments of the present application, Figure 6 for Figure 5 A cross-sectional view along line BB. The battery cell 10 may include an electrode assembly 11 .

[0095] The electrode assembly 11 is a component in the battery cell 10 where electrochemical reactions occur. The electrode assembly 11 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 11, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a pole ear. The pole ear of the positive electrode sheet is the positive pole ear, and the pole ear of the negative electrode sheet is the negative pole ear. The positive pole ear and the negative pole ear can be located together at one end of the main body or respectively at two opposite ends of the main body.

[0096] In the battery cell 10 , the number of the electrode assembly 11 may be one or more.

[0097] In some cases, the electrode assembly 11 may also be referred to as a bare cell, a wound body, a laminated body, etc.

[0098] In some embodiments, the battery cell 10 may further include an electrolyte, which plays a role in conducting ions between the positive electrode plate and the negative electrode plate. The electrolyte involved in the embodiments of the present application may be liquid, gel or solid.

[0099] In some embodiments, please refer to Figure 5 and Figure 6The battery cell 10 may further include a housing assembly 12 , which is used to define an internal environment of the battery cell 10 , and is used to accommodate the electrode assembly 11 and the electrolyte.

[0100] In some embodiments, please refer to Figure 5 and Figure 6 The shell assembly 12 may include a shell 121 and an end cap 122. The shell 121 and the end cap 122 are components for jointly defining the internal environment of the battery cell 10. The internal environment defined by the shell 121 and the end cap 122 is used to accommodate the electrode assembly 11 and the electrolyte. Among them, the shell 121 and the end cap 122 may be independent components. Specifically, the shell 121 has an opening, and the end cap 122 is covered at the opening of the shell 121 to jointly define the internal environment of the battery cell 10 with the shell 121, and to isolate the internal environment of the battery cell 10 from the external environment. Alternatively, the shell 121 and the end cap 122 may also be an integrated structure. Specifically, a common connection surface may be formed between the end cap 122 and the shell 121 before the electrode assembly 11 is placed in the shell. When the electrode assembly 11 needs to be packaged after the electrode assembly 11 is placed in the shell, the end cap 122 covers the shell 121.

[0101] The number of the end cap 122 can be one, such as Figure 5 and Figure 6 Alternatively, the number of the end caps 122 may be two, and the two end caps 122 are respectively disposed at opposite ends of the housing 121 .

[0102] The shell 121 may be cylindrical, square, or other shapes, which may be determined according to the specific shape and size of the electrode assembly 11. In addition, the shell 121 and the end cap 122 may be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, or the like.

[0103] Please also read Figures 3 to 8 , Figures 10 to 14 , and combined with other drawings. Among them, Figure 3 A schematic diagram of a battery 100 provided in some embodiments of the present application, specifically a schematic diagram of the battery 100 from the perspective of the second direction X involved below, that is, Figure 3 The battery 100 is perpendicular to the second direction X in the view. Figure 4 for Figure 3 Enlarged view of point A in the middle. Figure 7 for Figure 6 The enlarged image of point C in the middle. Figure 8 A partial schematic diagram of a battery cell 10 of a battery 100 provided in some embodiments of the present application, specifically a schematic diagram of a portion of the battery cell 10 in the perspective of the first direction Z mentioned below, that is, Figure 8 The battery cell 10 in the figure is perpendicular to the first direction Z. Fig.10 Partial three-dimensional structural diagram of a battery 100 provided in some other embodiments of the present application, Fig.11 for Fig.10 Sectional view along DD, Fig.12 for Fig.11 Enlarged view of point E in the middle. Fig.13 The battery 100 provided in some embodiments of the present application is Fig.10 The cross-sectional view of DD in Fig.14 for Fig.13 The battery 100 provided in the embodiment of the present application includes a battery cell 10 and a fire extinguishing structure 30. The battery cell 10 includes a housing assembly 12, and the housing assembly 12 is provided with a weak structure 123. The fire extinguishing structure 30 is spaced apart from and arranged opposite to the weak structure 123. Figures 3 to 8 The housing assembly 12 includes a first wall 1221 and a pressure relief mechanism 123a connected to the first wall 1221, and the weak structure 123 includes the pressure relief mechanism 123a; and / or, as Figures 10 to 14 As shown, and in combination with other drawings, the housing assembly 12 is formed with a weld 123 b , and the weak structure 123 includes the weld 123 b .

[0104] The weak structure 123 refers to a relatively weak part of the battery cell 10. During thermal runaway of the battery cell 10, due to the relatively weak design of the weak structure 123, the high-temperature and high-pressure gas and flame generated inside the battery cell 10 can easily break through the weak structure 123 and spray out from the weak structure 123. The weak structure 123 may include at least one of a weld 123b and a pressure relief mechanism 123a.

[0105] The weak structure 123 may be disposed on the shell 121 of the shell assembly 12 , may be disposed on the end cover 122 of the shell assembly 12 , or may be disposed between the shell 121 and the end cover 122 of the shell assembly 12 .

[0106] The fire extinguishing structure 30 refers to a structure made of fire extinguishing material and having a fire extinguishing function. Specifically, the fire extinguishing structure 30 can suppress the generation and spread of flames, and can take away the heat in the high-temperature and high-pressure gas and flames during operation to achieve a cooling and fire extinguishing function. That is, the fire extinguishing structure 30 has a cooling and fire extinguishing function.

[0107] The fire extinguishing structure 30 is spaced apart from and arranged opposite to the weak structure 123, which means that the fire extinguishing structure 30 is spaced apart from and arranged opposite to the end side of the weak structure 123 away from the electrode assembly 11, and is arranged opposite to the weak structure 123. The fire extinguishing structure 30 can be spaced apart from and arranged opposite to the pressure relief mechanism 123a of the weak structure 123, and the fire extinguishing joint 30 can also be spaced apart from and arranged opposite to the weld 123b of the weak structure 123.

[0108] Understandably, in some possible designs, such as Figures 3 to 8 As shown in the figure, and in combination with other drawings. The weak structure 123 includes a pressure relief mechanism 123a, and at least one fire extinguishing structure 30 spaced apart from and arranged opposite to the weak structure 123 is spaced apart from and arranged opposite to the pressure relief mechanism 123a. Specifically, at least one fire extinguishing structure 30 is spaced apart from the end side of the pressure relief mechanism 123a away from the electrode assembly 11, and is arranged opposite to the pressure relief mechanism 123a.

[0109] The first wall 1221 is a solid wall of the housing assembly 12 having a pressure relief mechanism 123a. Figures 3 to 6 As shown, the first wall 1221 may be disposed on the end cover 122 of the shell assembly 12 ; the first wall 1221 may also be disposed on the shell 121 of the shell assembly 12 .

[0110] As an example, Figures 3 to 7 As shown, at least one end of the housing assembly 12 along the first direction Z is provided with a first wall 1221, and at least one fire extinguishing structure 30 and the pressure relief mechanism 123a on the first wall 1221 are spaced apart and arranged opposite to each other along the first direction Z. That is, the relative direction of at least one fire extinguishing structure 30 and the pressure relief mechanism 123a is the first direction Z.

[0111] The pressure relief mechanism 123a is a mechanism that can release the internal pressure of the battery cell 10 when the internal pressure or temperature of the battery cell 10 reaches a threshold value. For example, when the battery cell 10 is working normally, the gas pressure inside the battery cell 10 is less than the opening pressure value of the pressure relief mechanism 123a, the pressure relief mechanism 123a is in a closed state, and the gas inside the battery cell 10 is not connected to the external gas. When the battery cell 10 has thermal runaway due to internal and external factors such as overcharge, overdischarge, overheating, and mechanical collision, a large amount of high-temperature and high-pressure gas is generated inside the battery cell 10, making the pressure inside the battery cell 10 greater than the opening pressure value of the pressure relief mechanism 123a, and the pressure relief mechanism 123a changes from a closed state to an open state, and the high-temperature and high-pressure gas inside the battery cell 10 can be discharged to the outside of the battery cell 10 through the pressure relief mechanism 123a.

[0112] The pressure relief mechanism 123a may be a structure at least partially lower in structural strength than other parts of the housing assembly 12, for example, the pressure relief portion 1231a of the pressure relief mechanism 123a may have a lower structural strength than the first wall 1221 of the housing assembly 12; or, the pressure relief mechanism 123a may be a pressure valve or other structure. In this way, when thermal runaway occurs in the battery cell 10, the high-temperature and high-pressure gas and flame generated by the battery cell 10 may break through the pressure relief mechanism 123a to be released outside the battery cell 10.

[0113] The weak structure 123 includes the pressure relief mechanism 123 a , which means that at least a portion of the weak structure 123 is the pressure relief mechanism 123 a .

[0114] Understandably, in some possible designs, such as Figures 10 to 14 As shown in the figure, and in combination with other figures, the weak structure 123 includes a weld 123b, and at least one fire extinguishing structure 30 spaced apart from and arranged opposite to the weak structure 123 is spaced apart from and arranged opposite to the weld 123b.

[0115] The weld 123 b refers to a trace formed by welding the shell assembly 12 .

[0116] The weak structure 123 includes the weld 123 b , which means that at least a portion of the weak structure 123 is the weld 123 b .

[0117] The battery 100 provided in the embodiment of the present application is provided with a fire extinguishing structure 30 on the battery 100, and the fire extinguishing structure 30 is spaced and arranged opposite to the weak structure 123 of the battery cell 10, so that the high-temperature and high-pressure gas and flame generated inside the battery cell 10 can be sprayed toward the fire extinguishing structure 30 when they are ejected from the weak structure 123. Specifically, when at least one fire extinguishing structure 30 is spaced and arranged opposite to the pressure relief mechanism 123a of the weak structure 123, the high-temperature and high-pressure gas and flame generated inside the battery cell 10 can be sprayed toward the fire extinguishing structure 30 when they are ejected from the pressure relief mechanism 123a. When at least one fire extinguishing structure 30 is spaced and arranged opposite to the weld 123b of the weak structure 123, the high-temperature and high-pressure gas and flame generated inside the battery cell 10 can also be sprayed toward the fire extinguishing structure 30 when they are ejected from the weld 123b. In this way, during the thermal runaway of the battery cell, the fire extinguishing structure 30 can cool down and extinguish the high-temperature and high-pressure gas and flame ejected from at least one of the pressure relief mechanism 123a and the weld 123b of the weak structure 123 of the battery cell 10, specifically, it can reduce the temperature of the high-temperature and high-pressure gas ejected from the weak structure 123 of the battery cell 10, and extinguish the flame ejected from the weak structure 123 of the battery cell 10, so as to achieve the effect of cooling and extinguishing the fire. Such a configuration can improve the thermal runaway reaction and heat spread of the battery cell 10, thereby improving the chain reaction problem of thermal runaway of the adjacent battery cells 10, so as to improve the thermal runaway of the entire battery 100 and improve the reliability of the battery 100.

[0118] In addition, the fire extinguishing structure 30 and the weak structure 123 are spaced apart so that in the relative direction of the fire extinguishing structure 30 and the weak structure 123, there is a certain exhaust space between the fire extinguishing structure 30 and the weak structure 123, which is conducive to the release of high-temperature and high-pressure gas and flame. In this way, the problem of the fire extinguishing structure 30 blocking high-temperature and high-pressure gas and flame can be improved, and then the problem of high-temperature and high-pressure gas and flame accumulating in the battery cell 10 and being difficult to release can be improved, so that the thermal runaway reaction of the battery 100 can be improved and the reliability of the battery 100 can be improved. That is, at least one fire extinguishing structure 30 can be spaced apart from the pressure relief mechanism 123a to form an exhaust space; at least one fire extinguishing structure 30 can also be spaced apart from the weld 123b to form an exhaust space.

[0119] In some embodiments, please refer to Figures 3 to 8 The housing assembly 12 may include a housing 121 and an end cover 122, the end cover 122 is disposed at an end of the housing 121 along a first direction Z, a first wall 1221 is disposed on the end cover, and at least one fire extinguishing structure 30 and a pressure relief mechanism 123a are spaced and disposed oppositely along the first direction Z.

[0120] In some embodiments, please refer to Figures 3 to 8 , and in combination with other drawings. The pressure relief mechanism 123a includes a pressure relief portion 1231a. The first wall 1221 is connected to the outer periphery of the pressure relief portion 1231a, and at least one fire extinguishing structure 30 is spaced apart from and arranged opposite to the pressure relief portion 1231a.

[0121] The pressure relief portion 1231a is a portion of the pressure relief mechanism 123a for pressure relief. Specifically, during thermal runaway of the battery cell 10, the high-temperature and high-pressure gas and flame inside the battery cell 10 may break through the pressure relief portion 1231a, causing the pressure relief portion 1231a to move relative to the first wall 1221 to form a passage for the high-temperature and high-pressure gas and flame to pass through, thereby achieving pressure relief.

[0122] The first wall 1221 is connected to the outer periphery of the pressure relief portion 1231a. Specifically, the first wall 1221 is arranged around the outer periphery of the pressure relief portion 1231a and is connected to the pressure relief portion 1231a. The first wall 1221 can be directly connected to the pressure relief portion 1231a; or Figure 8 As shown, the pressure relief mechanism 123a may further include a connecting portion 1232a, which is disposed around the outer periphery of the pressure relief portion 1231a and connected to the pressure relief portion 1231a, and the first wall 1221 is connected to the connecting portion 1232a.

[0123] At least one fire extinguishing structure 30 and the pressure relief portion 1231a are arranged in a spaced and opposite manner, so that the high-temperature and high-pressure gas and flame generated by the battery cell 10 can be effectively sprayed toward the fire extinguishing structure 30 when sprayed from the pressure relief portion 1231a. In this way, the fire extinguishing structure 30 can fully contact the high-temperature and high-pressure gas and flame discharged from the battery cell 10 to effectively achieve the cooling and fire extinguishing effect, thereby effectively improving the thermal runaway reaction and heat spread of the battery cell 10, and further improving the thermal runaway reaction of the entire battery 100, and improving the reliability of the battery 100.

[0124] In some embodiments, the pressure relief portion 1231a is separately disposed on the first wall 1221. For example, the pressure relief portion 1231a may be a pressure valve disposed on the first wall 1221.

[0125] In some embodiments, the pressure relief portion 1231 a is integrally disposed on the first wall 1221 , and a first easy-to-break mark is disposed between the first wall 1221 and the pressure relief portion 1231 a .

[0126] The first easy-to-break mark may be a notch, a dotted line or other mark that is easy to break.

[0127] Based on this, when the battery cell 10 experiences thermal runaway, the high-temperature and high-pressure gas and flame generated inside the battery cell 10 can break through the pressure relief portion 1231a, causing the first easy-to-break mark between the pressure relief portion 1231a and the first wall 1221 to break, thereby allowing the pressure relief portion 1231a to release pressure.

[0128] In some embodiments, please refer to Figure 7 and Figure 8 , and in combination with other drawings. The pressure relief mechanism 123a further includes a connecting portion 1232a, and the connecting portion 1232a is connected to the outer periphery of the pressure relief portion 1231a.

[0129] The connecting portion 1232a is connected to the first wall 1221. The connecting portion 1232a is integrally arranged on the first wall 1221; or Figure 7 and Figure 8 As shown, the connecting portion 1232 a is separately disposed on the first wall 1221 .

[0130] Among some possible designs, such as Figure 7 and Figure 8 As shown, the pressure relief portion 1231a is integrally provided on the connecting portion 1232a, and a second easy-breaking mark 1233a is provided between the pressure relief portion 1231a and the connecting portion 1232a.

[0131] The second easy-to-break mark 1233a may be a notch, a dotted line or other easy-to-break mark.

[0132] Based on this, when the battery cell 10 experiences thermal runaway, the high-temperature and high-pressure gas and flame generated inside the battery cell 10 can break through the pressure relief portion 1231a, causing the second easy-to-break mark 1233a between the pressure relief portion 1231a and the connecting portion 1232a to be disconnected, thereby causing the pressure relief portion 1231a to release pressure.

[0133] In some other possible designs, the pressure relief portion 1231a is separately disposed on the connecting portion 1232a.

[0134] Such an arrangement allows for a variety of types of pressure relief mechanisms 123a, making the design very flexible.

[0135] For the convenience of description, at least one fire extinguishing structure 30 spaced apart from and arranged opposite to the pressure relief portion 1231 a is defined as a first fire extinguishing component 30 a .

[0136] In some embodiments, please refer to Figures 3 to 9 , and combined with other drawings. Among them, Fig. 9 A schematic diagram of a fire extinguishing structure 30 of a battery 100 provided in some embodiments of the present application, Fig. 9 The fire extinguishing structure 30 is a first fire extinguishing member 30a. On a projection plane perpendicular to the relative direction of the first fire extinguishing member 30a and the pressure relief portion 1231a, the projection of the pressure relief portion 1231a is located within the projection of the first fire extinguishing member 30a. In addition, in a direction perpendicular to the relative direction of the first fire extinguishing member 30a and the pressure relief portion 1231a, the ratio of the size of the first fire extinguishing member 30a to the size of the pressure relief portion 1231a is ≥1.2.

[0137] On the projection plane perpendicular to the relative direction between the first fire extinguishing member 30a and the pressure relief portion 1231a, the projection of the pressure relief portion 1231a refers to the projection formed by projecting the pressure relief portion 1231a along the relative direction between the first fire extinguishing member 30a and the pressure relief portion 1231a. On the projection plane perpendicular to the relative direction between the first fire extinguishing member 30a and the pressure relief portion 1231a, the projection of the first fire extinguishing member 30a refers to the projection formed by projecting the first fire extinguishing member 30a along the relative direction between the first fire extinguishing member 30a and the pressure relief portion 1231a.

[0138] It can be understood that the orthographic projection of the first fire extinguishing member 30a on the housing assembly 12 covers the pressure relief portion 1231a. The orthographic projection of the first fire extinguishing member 30a on the housing assembly 12 refers to the projection of the first fire extinguishing member 30a projected onto the housing assembly 12 along the relative direction between the first fire extinguishing member 30a and the pressure relief portion 1231a.

[0139] It can also be understood that, on the projection plane perpendicular to the relative direction of the first fire extinguishing component 30a and the pressure relief portion 1231a, the projection of the first fire extinguishing component 30a covers the entire projection of the pressure relief portion 1231a, and the projection outer contour of the first fire extinguishing component 30a is arranged around the periphery of the projection of the pressure relief portion 1231a.

[0140] As an example, Figures 3 to 7 As shown, at least one end of the housing assembly 12 along the first direction Z is provided with a first wall 1221, and the first fire extinguishing member 30a and the pressure relief portion 1231a on the first wall 1221 are spaced apart and arranged opposite to each other along the first direction Z. That is, the relative direction of the first fire extinguishing member 30a and the pressure relief portion 1231a is the first direction Z. Based on this, on the projection plane perpendicular to the first direction Z, the projection of the pressure relief portion 1231a is located within the projection of the first fire extinguishing member 30a.

[0141] The direction perpendicular to the first direction Z may include a second direction X, and may also include a third direction Y. The second direction X is perpendicular to the third direction Y. In some cases, the first direction Z may be a height direction of the battery cell 10, the second direction X may be a width direction of the battery cell 10, and the third direction Y may be a length direction of the battery cell 10, and the length of the battery cell 10 is greater than the width of the battery cell 10.

[0142] like Figure 8 and Fig. 9 In the second direction X, the size of the first fire extinguishing element 30a is the first size W1, the size of the pressure relief portion 1231a is the second size W2, the first size W1 is greater than the second size W2, and the first size W1 / the second size W2 ≥ 1.2, specifically, it can be 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, etc.

[0143] In the third direction Y, the size of the first fire extinguishing element 30a is the third size W3, the size of the pressure relief portion 1231a is the fourth size W4, the third size W3 is greater than the fourth size W4, and the third size W3 / fourth size W4≥1.2, specifically can be 1.2, 1.25, 1.3, 1.35, 1.4, 1.45, 1.5, 1.55, etc.

[0144] In this way, the orthographic projection of the first fire extinguishing element 30a on the housing assembly 12 covers the pressure relief portion 1231a, so that the pressure relief portion 1231a can be completely arranged opposite to the first fire extinguishing element 30a. In this way, the high-temperature and high-pressure gas and flame ejected from the pressure relief portion 1231a can be ejected to the first fire extinguishing element 30a to a large extent, so that the first fire extinguishing element 30a can effectively cool down and extinguish the high-temperature and high-pressure gas and flame ejected from the pressure relief portion 1231a, thereby effectively improving the thermal runaway reaction and heat spread problems of the battery cell 10, improving the thermal runaway problem of the battery 100, and improving the reliability of the battery 100.

[0145] In some embodiments, please refer to Figures 3 to 6 , and in combination with other drawings. At least one fire extinguishing structure 30 is spaced and arranged opposite to the pressure relief mechanism 123a in a one-to-one correspondence.

[0146] It can be understood that the fire extinguishing structure 30 can be divided into at least one part, and in one part, each fire extinguishing structure 30 and each pressure relief mechanism 123a are spaced and arranged relatively to each other in a one-to-one correspondence.

[0147] Such arrangement enables at least one fire extinguishing structure 30 to cool down and extinguish the high-temperature and high-pressure gas and flame ejected from the pressure relief mechanism 123 a one-to-one, thereby helping to improve the thermal runaway and heat spread problems of the battery cell 10 .

[0148] In some embodiments, there are multiple pressure relief mechanisms 123 a , and at least one fire extinguishing structure 30 is spaced apart from and disposed opposite to the multiple pressure relief mechanisms 123 a .

[0149] The housing assembly 12 may be provided with a plurality of pressure relief mechanisms 123a distributed at intervals, so that the number of pressure relief mechanisms 123a is multiple. The battery 100 may include a plurality of battery cells 10, and the housing assembly 12 of each battery cell 10 is provided with a pressure relief mechanism 123a, so that the number of pressure relief mechanisms 123a is multiple.

[0150] It can be understood that the fire extinguishing structure 30 can be divided into at least one part, and in one part, each fire extinguishing structure 30 can be spaced apart from and arranged opposite to a plurality of pressure relief mechanisms 123a.

[0151] That is, at least one fire extinguishing structure 30 is disposed opposite to and spaced from the pressure relief mechanism 123a in a one-to-many manner.

[0152] Such arrangement enables at least one fire extinguishing structure 30 to cool down and extinguish the high-temperature and high-pressure gas and flames ejected from the multiple pressure relief mechanisms 123a.

[0153] By adopting the above technical solution, the layout of the fire extinguishing structure 30 in the battery 100 is very flexible.

[0154] In some embodiments, please refer to Figures 10 to 14 , and in combination with other drawings. The shell assembly 12 includes a shell 121 and an end cover 122. The end cover 122 is disposed on the shell 121 to form a space for accommodating the electrode assembly 11 with the shell 121.

[0155] Among some possible designs, such as Figures 10 to 14 As shown in the figure, and in combination with other figures, a first weld is formed between the shell 121 and the end cover 122. The weld 123b includes the first weld, and at least one fire extinguishing structure 30 is spaced apart from and arranged opposite to the first weld.

[0156] The first weld refers to the trace formed by welding the shell 121 and the end cover 122. Figures 10 to 14 The welds in the figure are all first welds.

[0157] The weld 123b includes a first weld, which means that at least a portion of the weld 123b is the first weld.

[0158] By having at least one fire extinguishing structure 30 spaced apart from and arranged opposite to the first weld, the high-temperature and high-pressure gas and flame ejected from the first weld can be sprayed toward the at least one fire extinguishing structure 30, and the at least one fire extinguishing structure 30 can cool down and extinguish the high-temperature and high-pressure gas and flame ejected from the first weld.

[0159] In some possible designs, the shell 121 is formed with a second weld, the weld 123 b includes the second weld, and the at least one fire extinguishing structure 30 is spaced apart from and disposed opposite to the second weld.

[0160] The second weld refers to a trace formed by welding of the shell 121 itself.

[0161] The weld 123b includes a second weld, which means that at least a portion of the weld 123b is a second weld.

[0162] By having at least one fire extinguishing structure 30 spaced apart from and arranged opposite to the second weld, the high-temperature and high-pressure gas and flame ejected from the second weld can be sprayed toward the at least one fire extinguishing structure 30, and the at least one fire extinguishing structure 30 can cool down and extinguish the high-temperature and high-pressure gas and flame ejected from the second weld.

[0163] By adopting the above technical solution, the types and positions of the welds 123 b can be various, and the fire extinguishing structure 30 can be used to achieve cooling and fire extinguishing.

[0164] In some embodiments, please refer to Figures 10 to 14 , and in combination with other drawings. The end cover 122 is disposed at the end of the housing 121 along the first direction Z.

[0165] The end caps 122 and the housing 121 may be sequentially distributed along the first direction Z. Alternatively, Figures 10 to 14 As shown, the end cap 122 can be arranged at the opening of the end of the shell 121 along the first direction Z, so that the shell 121 is roughly surrounded by the end cap 122 around the periphery of the first direction Z, that is, the end cap 122 and the shell 121 are roughly distributed along a direction perpendicular to the first direction Z.

[0166] Specifically, two opposite ends of the end cover 122 along the second direction X and two opposite ends of the end cover 122 along the third direction Y are respectively welded to the shell 121 to form a first weld. That is, among the ends of the shell assembly 12 along the first direction Z, two opposite ends of the end in the second direction X and two opposite ends of the end in the third direction Y are respectively formed with a first weld.

[0167] In some embodiments, please refer to Figures 10 to 12 , and in combination with other drawings. At least one fire extinguishing structure 30 is spaced apart from and opposite to the first weld along the first direction Z.

[0168] It can be understood that at least one fire extinguishing structure 30 is disposed on the end side of the first weld away from the electrode assembly 11 along the first direction Z, and is spaced and arranged opposite to the first weld along the first direction Z. That is, the relative direction between the at least one fire extinguishing structure 30 and the first weld is the first direction Z.

[0169] In some embodiments, please refer to Fig.13 and Fig.14 In the direction perpendicular to the first direction Z, at least one fire extinguishing structure 30 is spaced apart from and arranged opposite to the first weld.

[0170] In some possible designs, the direction perpendicular to the first direction Z may include a second direction X, such as Fig.13 and Fig.14 As shown, at least one fire extinguishing structure 30 is disposed at the end side of the first weld away from the electrode assembly 11 along the second direction X, and is spaced and disposed opposite to the first weld along the second direction X. Based on this, the relative direction of the at least one fire extinguishing structure 30 and the first weld is the second direction X.

[0171] In some possible designs, the direction perpendicular to the first direction Z may include a third direction Y, and at least one fire extinguishing structure 30 is disposed on the end side of the first weld away from the electrode assembly 11 along the third direction Y, and is spaced and arranged opposite to the first weld along the third direction Y. Based on this, the relative direction of the at least one fire extinguishing structure 30 and the first weld is the third direction Y.

[0172] The second direction X and the third direction Y are perpendicular.

[0173] Such arrangement makes the relative arrangement of the fire extinguishing structure 30 and the weld 123b very flexible, and the high-temperature and high-pressure gas and flame ejected from different directions through the first weld can be ejected toward the fire extinguishing structure 30, so as to obtain the effect of cooling and extinguishing the fire through the fire extinguishing structure 30. In this way, it is helpful to improve the thermal runaway reaction and heat propagation problems of the battery cell 10, so as to improve the thermal runaway of the battery 100 and improve the reliability of the battery 100.

[0174] In some embodiments, Fig.13 and Fig.14 As shown, and in combination with other drawings. The battery 100 may include a plurality of battery cells 10, at least some of which are distributed along the second direction X, and at least one fire extinguishing structure 30 is disposed between the first welds of two battery cells 10 adjacent to each other along the second direction X, so that the first welds of at least two battery cells 10 adjacent to each other along the second direction X are spaced apart from and arranged opposite to the fire extinguishing structure 30. In this way, at least one fire extinguishing structure 30 can cool down and extinguish the first welds of the two battery cells 10.

[0175] In some embodiments, the battery 100 may include multiple battery cells 10, at least some of the battery cells 10 are distributed along a third direction Y, and at least one fire extinguishing structure 30 is arranged between the first welds of two adjacent battery cells 10 along the third direction Y, so that the first welds of at least two adjacent battery cells 10 along the third direction Y are spaced apart and arranged relative to the fire extinguishing structure 30.

[0176] In some embodiments, please refer to Figures 10 to 14 , and in combination with other drawings. At least one fire extinguishing structure 30 is a second fire extinguishing component 30b, and the second fire extinguishing component 30b is spaced apart from and arranged opposite to the weld 123b.

[0177] In some embodiments, please refer to Figures 10 to 14 In the relative direction between the second fire extinguishing member 30b and the weld 123b, the projection width of the second fire extinguishing member 30b on the housing assembly 12 of the battery cell 10 is greater than 4 mm.

[0178] In the relative direction between the second fire extinguishing component 30b and the weld 123b, the projection of the second fire extinguishing component 30b on the shell assembly 12 refers to the projection of the second fire extinguishing component 30b on the shell assembly 12 along the relative direction between the second fire extinguishing component 30b and the weld 123b, that is, the orthographic projection of the second fire extinguishing component 30b on the shell assembly 12.

[0179] As an example, two opposite ends of the end cover 122 along the second direction X and two opposite ends of the end cover 122 along the third direction Y are respectively welded to the shell 121 to form a first weld. That is, among the ends of the shell assembly 12 along the first direction Z, the two opposite ends of the end in the second direction X and the two opposite ends of the end in the third direction Y are respectively formed with a first weld.

[0180] Based on this, in some possible designs, such as Figures 10 to 12 As shown, the second fire extinguishing element 30b is spaced apart from and opposite to the first welding seam along the first direction Z.

[0181] Among the ends of the shell component 12 along the first direction Z, the first weld of at least one end opposite to the second direction X can be spaced and arranged opposite to the second fire extinguishing element 30b along the first direction Z, and at this time, the width of the positive projection of the second fire extinguishing element 30b on the shell component 12 is the second direction X. Based on this, in the relative direction between the second fire extinguishing element 30b and the weld 123b, the projection width of the second fire extinguishing element 30b on the shell component 12 is the size of the positive projection of the second fire extinguishing element 30b on the shell component 12 in the second direction X.

[0182] Among them, Figures 10 to 12 As shown, among the ends of the housing component 12 along the first direction Z, the first weld of at least one end opposite to the third direction Y can be spaced and arranged opposite to the second fire extinguishing element 30b along the first direction Z, and at this time, the width of the positive projection of the second fire extinguishing element 30b on the housing component 12 is the third direction Y. Based on this, in the relative direction between the second fire extinguishing element 30b and the weld 123b, the projection width of the second fire extinguishing element 30b on the housing component 12 is the size of the positive projection of the second fire extinguishing element 30b on the housing component 12 in the third direction Y.

[0183] In some other possible designs, such as Fig.13 and Fig.14 As shown, and combined with other drawings. In a direction perpendicular to the first direction Z, the second fire extinguishing member 30b is spaced and arranged opposite to the first weld. Among them, the width of the positive projection of the second fire extinguishing member 30b on the shell assembly 12 is the first direction Z. Based on this, in the relative direction between the second fire extinguishing member 30b and the weld 123b, the projection width of the second fire extinguishing member 30b on the shell assembly 12 is the size of the positive projection of the second fire extinguishing member 30b on the shell assembly 12 in the first direction Z.

[0184] Among them, the width of the orthographic projection of the second fire extinguishing element 30b on the shell assembly 12 is greater than 4mm, and can be specifically 4.1mm, 4.5mm, 4.8mm, 5mm, 5.5mm, 5.8mm, 6mm, 6.5mm, 7mm, 7.5mm, etc.

[0185] Such arrangement enables the orthographic projection of the second fire extinguishing element 30b on the housing assembly 12 to have a larger width, so that the second fire extinguishing element 30b can be well opposite to the weld 123b and cover the weld 123b. In this way, the high-temperature and high-pressure gas and flame ejected from the weld 123b can be ejected toward the second fire extinguishing element 30b, so as to obtain the effect of cooling and extinguishing the fire through the second fire extinguishing element 30b. In this way, it is helpful to improve the thermal runaway reaction and heat spread problems of the battery cell 10, so as to improve the thermal runaway of the battery 100 and improve the reliability of the battery 100.

[0186] In some embodiments, please refer to Figures 10 to 14 The battery 100 includes a plurality of battery cells 10 , and at least one fire extinguishing structure 30 is spaced apart from and disposed opposite to the welds 123 b of the plurality of battery cells 10 .

[0187] It can be understood that the fire extinguishing structure 30 can be divided into at least one part, and in one part, each fire extinguishing structure 30 can be spaced apart from and disposed opposite to the welding seams 123 b of the plurality of battery cells 10 .

[0188] In this way, at least one fire extinguishing structure 30 can be spaced and arranged opposite to the weld 123b of the battery cell 10 in a one-to-many manner, so that the high-temperature and high-pressure gas and flames ejected from the welds 123b of the multiple battery cells 10 can be cooled and extinguished. In this way, the layout of the fire extinguishing structure 30 on the battery 100 is facilitated.

[0189] In some embodiments, please refer to Figures 3 to 14 In combination with other drawings, on a projection plane perpendicular to the relative direction of the weak structure 123 and the fire extinguishing structure 30 , the projection of the weak structure 123 is located within the projection of the fire extinguishing structure 30 .

[0190] On the projection plane perpendicular to the relative direction of the weak structure 123 and the fire extinguishing structure 30, the projection of the weak structure 123 refers to the projection formed by projecting the weak structure 123 along the relative direction of the weak structure 123 and the fire extinguishing structure 30. On the projection plane perpendicular to the relative direction of the weak structure 123 and the fire extinguishing structure 30, the projection of the fire extinguishing structure 30 refers to the projection formed by projecting the fire extinguishing structure 30 along the relative direction of the weak structure 123 and the fire extinguishing structure 30.

[0191] It can be understood that the orthographic projection of the fire extinguishing structure 30 on the battery cell 10 covers the weak structure 123. The orthographic projection of the fire extinguishing structure 30 on the battery cell 10 refers to the projection of the fire extinguishing structure 30 onto the battery cell 10 along the relative direction of the weak structure 123 and the fire extinguishing structure 30.

[0192] It can also be understood that, on the projection plane perpendicular to the relative directions of the weak structure 123 and the fire extinguishing structure 30 , the projection of the fire extinguishing structure 30 covers the entire projection of the weak structure 123 , and the outer contour of the projection of the fire extinguishing structure 30 is arranged around the periphery of the projection of the weak structure 123 .

[0193] Among some possible designs, such as Figures 3 to 9 As shown in the figure, and in combination with other drawings. The weak structure 123 may include a pressure relief mechanism 123a, the pressure relief mechanism 123a includes a pressure relief portion 1231a, and at least one fire extinguishing structure 30 is a first fire extinguishing member 30a. On a projection plane perpendicular to the relative direction of the first fire extinguishing member 30a and the pressure relief portion 1231a, the projection of the pressure relief portion 1231a is located within the projection of the first fire extinguishing member 30a.

[0194] Among some possible designs, such as Figures 10 to 14 As shown, and in combination with other drawings. The weak structure 123 may include a weld 123b, and at least one fire extinguishing structure 30 is a second fire extinguishing member 30b. On a projection plane perpendicular to the relative direction of the second fire extinguishing member 30b and the weld 123b, the projection of the weld 123b is located within the projection of the second fire extinguishing member 30b.

[0195] With such arrangement, during the thermal runaway of the battery cell 10, the high-temperature and high-pressure gas and flame ejected from the weak structure 123 can be effectively ejected toward the fire extinguishing structure 30, thereby achieving a cooling and fire extinguishing effect through the fire extinguishing structure 30. In this way, the thermal runaway reaction and heat spread problems of the battery cell 10 can be improved, so as to improve the thermal runaway of the battery 100 and enhance the reliability of the battery 100.

[0196] In some embodiments, please refer to Figures 3 to 14 In the relative direction of the fire extinguishing structure 30 and the weak structure 123 , the distance between the fire extinguishing structure 30 and the weak structure 123 is ≥5 mm and ≤15 mm.

[0197] like Figures 3 to 9 As shown, at least one fire extinguishing structure 30 is a first fire extinguishing member 30a, and the first fire extinguishing member 30a is arranged at the end side of the pressure relief mechanism 123a away from the electrode assembly 11 along the first direction Z, and is spaced and arranged opposite to the pressure relief mechanism 123a along the first direction Z. Based on this, the relative direction of the fire extinguishing structure 30 and the weak structure 123 is the first direction Z. In the relative direction of the fire extinguishing structure 30 and the weak structure 123, the distance between the fire extinguishing structure 30 and the weak structure 123 is the first distance H1 between the first fire extinguishing member 30a and the pressure relief mechanism 123a in the first direction Z, 5mm≤first distance H1≤15mm.

[0198] like Figures 10 to 14 As shown, at least one fire extinguishing structure 30 is a second fire extinguishing element 30b.

[0199] Among them, Figures 10 to 12 As shown, the second fire extinguishing member 30b is arranged at the end side of the weld 123b away from the electrode assembly 11 along the first direction Z, and is spaced and arranged opposite to the weld 123b along the first direction Z. Based on this, the relative direction of the fire extinguishing structure 30 and the weak structure 123 is the first direction Z. In the relative direction of the fire extinguishing structure 30 and the weak structure 123, the spacing between the fire extinguishing structure 30 and the weak structure 123 is the second distance H2 between the second fire extinguishing member 30b and the weld 123b in the first direction Z, 5mm≤second distance H2≤15mm.

[0200] Among them, Fig.13 and Fig.14 As shown, the second fire extinguishing member 30b is arranged at the end side of the weld 123b away from the electrode assembly 11 along the second direction X, and is spaced and arranged opposite to the weld 123b along the second direction X. Based on this, the relative direction of the fire extinguishing structure 30 and the weak structure 123 is the first direction Z. In the relative direction of the fire extinguishing structure 30 and the weak structure 123, the spacing between the fire extinguishing structure 30 and the weak structure 123 is the third distance H3 between the second fire extinguishing member 30b and the weld 123b in the second direction X, 5mm≤the third distance H3≤15mm.

[0201] Among them, the distance between the fire extinguishing structure 30 and the weak structure 123 can be 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, 10.5mm, 11mm, 11.5mm, 12mm, etc.

[0202] Such arrangement enables a suitable spacing between the fire extinguishing structure 30 and the weak structure 123, so that the fire extinguishing structure 30 can fully cool down and extinguish the high-temperature and high-pressure gas and flame, and there is a certain exhaust space between the fire extinguishing structure 30 and the weak structure 123. In this way, the thermal runaway reaction and heat spread of the battery cell 10 can be improved, so as to improve the thermal runaway of the battery 100 and improve the reliability of the battery 100.

[0203] In some embodiments, please refer to Figures 3 to 14 In the relative direction of the fire extinguishing structure 30 and the weak structure 123 , the distance between the fire extinguishing structure 30 and the weak structure 123 is ≤10 mm.

[0204] Understandably, if Figures 3 to 7 As shown, 5mm≤the first distance H1≤10mm, and specifically can be 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc.

[0205] like Figures 10 to 12 As shown, 5mm≤the second distance H2≤10mm, and specifically can be 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc.

[0206] like Fig.13 and Fig.14 As shown, 5mm≤the third distance H3≤10mm, and specifically can be 5mm, 5.5mm, 6mm, 6.5mm, 7mm, 7.5mm, 8mm, 8.5mm, 9mm, 9.5mm, 10mm, etc.

[0207] As an example, Figures 3 to 7 As shown, 5mm≤first distance H1≤15mm.

[0208] As another example, Figures 10 to 12 As shown, 5mm≤the second distance H2≤10mm.

[0209] Such arrangement enables a suitable spacing between the fire extinguishing structure 30 and the weak structure 123, which is beneficial for the fire extinguishing structure 30 to fully and effectively perform the cooling and fire extinguishing operation, and is also beneficial for exhaust.

[0210] In some embodiments, please refer to Figure 3 , Figure 4 and Fig.15 , and combined with other drawings. Among them, Fig.15 The battery 100 further includes a heat insulation structure 40 which is spaced apart from and arranged opposite to the battery cell 10 and at least one fire extinguishing structure 30 is arranged on the heat insulation structure 40.

[0211] The heat insulation structure 40 refers to a structure used to be arranged opposite to the battery cell 10 to isolate the temperature of the battery cell 10 to a certain extent. The heat insulation structure 40 may include at least one of a mica structure, a ceramic structure, a glass fiber structure, a carbon fiber structure, a carbon-carbon composite material, and a pre-oxidized silk aerogel. As an example, the heat insulation structure 40 is a mica board.

[0212] In some possible designs, the heat insulation structure 40 and the fire extinguishing structure 30 are made of the same material and are integrally arranged. Alternatively, in other possible designs, the heat insulation structure 40 and the fire extinguishing structure 30 are separately arranged.

[0213] The fire extinguishing structure 30 is disposed on the heat insulating structure 40 , and may be, but is not limited to, bonded to the heat insulating structure 40 .

[0214] As an example, Figure 3 , Figure 4 and Fig.15 The heat insulation structure 40 is spaced apart at one end of the battery cell 10 along the first direction Z, and at least one fire extinguishing structure 30 is disposed on one side of the heat insulation structure 40 along the first direction Z toward the battery cell 10 and is disposed opposite to the weak structure 123 .

[0215] As an example, Fig.15 As shown, a plurality of fire extinguishing structures 30 are provided on the heat insulation structure 40 and are spaced apart from each other, and each fire extinguishing structure 30 is used to be spaced apart from and arranged opposite to each pressure relief mechanism 123a.

[0216] In some embodiments, the battery 100 further includes a wiring harness isolation plate, which is spaced apart from and disposed opposite to the battery cells 10 , and at least one fire extinguishing structure 30 is disposed on the wiring harness isolation plate.

[0217] As an example, the wire harness isolation plate is disposed at one end of the battery cell 10 along the first direction Z, and at least one fire extinguishing structure 30 is disposed at one side of the wire harness isolation plate along the first direction Z toward the weak structure 123 .

[0218] In some embodiments, the battery 100 further includes a box body 20 , the battery cells 10 are disposed in the box body 20 , and at least one fire extinguishing structure 30 is disposed on the box body 20 .

[0219] As an example, at least one fire extinguishing structure 30 is attached to the inner wall of the box body 20 and is spaced apart from and disposed opposite to the weak structure 123 .

[0220] By adopting the above technical solution, the fire extinguishing structure 30 can be flexibly arranged at multiple positions of the battery 100, so that at least one fire extinguishing structure 30 is arranged opposite to the weak structure 123. In this way, the layout of the fire extinguishing structure 30 on the battery 100 is facilitated.

[0221] In some embodiments, the fire extinguishing structure 30 spaced apart from and arranged opposite to the pressure relief mechanism 123a and the fire extinguishing structure 30 spaced apart from and arranged opposite to the weld 123b may be spaced apart from each other or may be connected to each other.

[0222] In some embodiments, the fire extinguishing structure 30 includes a capsule core for extinguishing fire and a capsule shell for encapsulating the capsule core.

[0223] With such arrangement, when the fire extinguishing structure 30 is in a high temperature environment, the capsule shell of the fire extinguishing structure 30 ruptures, and the capsule core in the capsule shell can reduce the temperature of the high temperature and high pressure gas and extinguish the flame, thereby achieving a cooling and fire extinguishing effect.

[0224] In some embodiments, the capsule core is a perfluorohexanone capsule core.

[0225] The perfluorohexanone capsule core refers to a capsule core made of perfluorohexanone material.

[0226] With such a configuration, when the fire extinguishing structure 30 is in a high temperature environment, when the capsule shell of the fire extinguishing structure 30 ruptures, the perfluorohexanone material of the perfluorohexanone capsule core can be decomposed into fluorine, oxygen and carbon atoms at high temperature, and these atoms can react with the high temperature and high pressure gas and hydrogen in the flame to obtain a stable compound, thereby effectively suppressing the spread of the flame. In addition, the perfluorohexanone material can take away heat during the decomposition process to reduce the temperature of the high temperature and high pressure gas and the flame, thereby suppressing the generation of the flame. Therefore, the fire extinguishing structure 30 can suppress the generation and spread of the flame and achieve a cooling and fire extinguishing effect.

[0227] In some embodiments, the capsule shell is a polymeric capsule shell.

[0228] The polymer capsule shell refers to a capsule shell made of a polymer material, wherein the polymer material may include one or more of polyester, polyurethane, phenolic resin, urea-formaldehyde resin, polyurea resin, polymer silicon, natural polymer, acrylic resin, and epoxy resin.

[0229] The setting of the polymer capsule shell enables the capsule shell to provide a certain degree of protection to the capsule core, and it can rupture in a high temperature environment, allowing the capsule core to be cooled and fire extinguished.

[0230] In some embodiments, the fire extinguishing structure 30 includes a microcapsule, and the microcapsule includes the capsule shell and the capsule core.

[0231] In some embodiments, there are multiple microcapsules, and the multiple microcapsules can be fixed by polymer adhesives or other adhesives.

[0232] Specifically, the polymer adhesive fixes the capsule shells of the plurality of microcapsules.

[0233] In some embodiments, a plurality of microcapsules can constitute a fire extinguishing layer of the fire extinguishing structure 30. The fire extinguishing structure 30 may further include an adhesive layer, which is disposed on the fire extinguishing layer and is used for bonding.

[0234] In some embodiments, the fire extinguishing structure 30 may further include a substrate, and the microcapsules may be disposed on a coating of the substrate to form a fire extinguishing layer.

[0235] In some embodiments, in the fire extinguishing structure 30, the weight ratio of perfluorohexanone to the polymer material ranges from 20% to 90%, and can specifically be 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, etc.

[0236] Such arrangement enables the fire extinguishing structure 30 to have a larger content of perfluorohexanone, thereby achieving a better cooling and fire extinguishing effect.

[0237] In some embodiments, in the fire extinguishing structure 30, the weight ratio of perfluorohexanone to the polymer material ranges from 50% to 85%, and can specifically be 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, etc.

[0238] In some embodiments, the overall thickness of the fire extinguishing structure 30 is in the range of 0.2 mm to 10 mm, that is, the sum of the thickness of the fire extinguishing layer and the adhesive layer is in the range of 0.2 mm to 10 mm, and can be specifically 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 0.7 mm, 0.75 mm, 0.8 mm, 0.9 mm, etc.

[0239] In some embodiments, the thickness of the fire extinguishing layer ranges from 0.2 mm to 0.45 mm, and specifically can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, etc.

[0240] Such arrangement enables the fire extinguishing layer to have a more appropriate thickness, thereby enabling the fire extinguishing structure 30 to have a smaller volume and a better fire extinguishing effect.

[0241] In some embodiments, the thickness of the adhesive layer ranges from 0.02 mm to 2 mm, and can be specifically 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.3 mm, 1.5 mm, 1.8 mm, etc.

[0242] In some embodiments, the thickness of the fire extinguishing structure 30 ranges from 0.3 mm to 3 mm, and specifically can be 0.5 mm, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, etc.

[0243] See also Figure 1 , the electric device provided in the embodiment of the present application includes a battery 100. The battery 100 in this embodiment is the same as the battery 100 in the previous embodiment. For details, please refer to the relevant description of the battery 100 in the previous embodiment, which will not be repeated here.

[0244] The electrical device provided in the embodiment of the present application can improve the thermal runaway of the entire battery 100 by adopting the battery 100 involved above, so as to improve the reliability of the battery 100 and further improve the reliability of the electrical device.

[0245] As one of the embodiments of this application, Figures 3 to 5As shown, the battery 100 includes a fire extinguishing structure 30 and a plurality of battery cells 10, and a pressure relief mechanism 123a is provided at one end of each battery cell 10 along the first direction Z. The battery 100 also includes a heat insulation structure 40 or a wiring harness isolation plate, and the fire extinguishing structure 30 is provided on the heat insulation structure 40 or the wiring harness isolation plate, and the heat insulation structure 40 or the wiring harness isolation plate is spaced apart at one end of the battery cell 10 along the first direction Z. In the first direction Z, the fire extinguishing structure 30 and the pressure relief mechanism 123a are spaced apart and arranged opposite to each other.

[0246] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery, characterized in that: include: A battery cell, comprising a housing assembly, wherein the housing assembly is provided with a weak structure; a fire extinguishing structure, spaced apart from and arranged opposite to the weak structure; Wherein, the shell assembly includes a first wall and a pressure relief mechanism connected to the first wall, and the weak structure includes the pressure relief mechanism; and / or, the shell assembly is formed with a weld, and the weak structure includes the weld.

2. The battery according to claim 1, characterized in that The pressure relief mechanism comprises a pressure relief portion; the first wall is connected to the outer periphery of the pressure relief portion, and at least one of the fire extinguishing structures is spaced apart from and arranged opposite to the pressure relief portion.

3. The battery according to claim 2, characterized in that The pressure relief part is disposed on the first wall; Alternatively, the pressure relief portion is integrally arranged on the first wall, and a first easy-breaking mark is arranged between the first wall and the pressure relief portion; Alternatively, the pressure relief mechanism further comprises a connection portion connected to the first wall, and the pressure relief portion is disposed on the connection portion; Alternatively, the pressure relief mechanism further comprises a connecting portion connected to the first wall, the pressure relief portion is integrally arranged on the connecting portion, and a second easy-breaking mark is provided between the pressure relief portion and the connecting portion.

4. The battery according to claim 2 or 3, characterized in that: At least one of the fire extinguishing structures spaced apart from and arranged opposite to the pressure relief portion is a first fire extinguishing component; on a projection plane perpendicular to the relative direction of the first fire extinguishing component and the pressure relief portion, the projection of the pressure relief portion is located within the projection of the first fire extinguishing component, and in a direction perpendicular to the relative direction of the first fire extinguishing component and the pressure relief portion, a ratio of a size of the first fire extinguishing component to a size of the pressure relief portion is ≥1.

2.

5. The battery according to any one of claims 1 to 4, characterized in that: At least one of the fire extinguishing structures is spaced apart from and arranged opposite to the pressure relief mechanism in a one-to-one correspondence; And / or, there are multiple pressure relief mechanisms, and at least one fire extinguishing structure is spaced apart from and arranged opposite to multiple pressure relief mechanisms.

6. The battery according to any one of claims 1 to 5, characterized in that: The shell assembly includes a shell and an end cover, wherein the end cover is arranged on the shell to form a space for accommodating the electrode assembly together with the shell; A first weld is formed between the shell and the end cover, the weld includes the first weld, and at least one of the fire extinguishing structures is spaced apart from and arranged opposite to the first weld; and / or a second weld is formed on the shell, the weld includes the second weld, and at least one of the fire extinguishing structures is spaced apart from and arranged opposite to the second weld.

7. The battery according to claim 6, characterized in that The end cover is arranged at the end of the shell along the first direction; At least one of the fire extinguishing structures and the first weld are spaced apart and arranged opposite to each other along the first direction; and / or, in a direction perpendicular to the first direction, at least one of the fire extinguishing structures and the first weld are spaced apart and arranged opposite to each other.

8. The battery according to any one of claims 1 to 7, characterized in that: At least one of the fire extinguishing structures is a second fire extinguishing component, and the second fire extinguishing component and the weld are spaced apart and arranged opposite to each other; in the relative direction of the second fire extinguishing component and the weld, the projection width of the second fire extinguishing component on the shell assembly is greater than 4 mm.

9. The battery according to any one of claims 1 to 8, characterized in that: The battery includes a plurality of battery cells, and at least one fire extinguishing structure is spaced apart from and arranged opposite to the welding seams of the plurality of battery cells.

10. The battery according to any one of claims 1 to 9, characterized in that: On a projection plane perpendicular to the relative directions of the weak structure and the fire extinguishing structure, the projection of the weak structure is located within the projection of the fire extinguishing structure.

11. The battery according to any one of claims 1 to 10, characterized in that: In the relative direction of the fire extinguishing structure and the weak structure, the distance between the fire extinguishing structure and the weak structure is ≥5 mm and ≤15 mm.

12. The battery according to claim 11, characterized in that In the relative direction of the fire extinguishing structure and the weak structure, the distance between the fire extinguishing structure and the weak structure is ≤10 mm.

13. The battery according to any one of claims 1 to 12, characterized in that: The battery further comprises a heat insulation structure spaced apart from and arranged opposite to the battery cell, and at least one of the fire extinguishing structures is arranged on the heat insulation structure; And / or, the battery further comprises a wiring harness isolation plate spaced apart from and arranged opposite to the battery cell, and at least one of the fire extinguishing structures is arranged on the wiring harness isolation plate; And / or, the battery further comprises a box, the battery cells are arranged in the box, and at least one of the fire extinguishing structures is arranged on the box.

14. The battery according to any one of claims 1 to 13, characterized in that: The fire extinguishing structure comprises a capsule core for extinguishing fire and a capsule shell for encapsulating the capsule core.

15. The battery according to claim 14, characterized in that The capsule core is a perfluorohexanone capsule core; and / or the capsule shell is a polymer capsule shell.

16. An electrical device, characterized in that: Comprising a battery according to any one of claims 1-15.

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