Battery monomer, battery and electric device

Abstract

The utility model is applicable to the technical field of batteries, and provides a battery monomer, a battery and a power utilization device, the power utilization device comprises the battery, the battery comprises the battery monomer, and the battery monomer comprises an electrode assembly and a fire extinguishing structure. The electrode assembly comprises a main body part and a tab connected to the main body part. The electrode assembly further comprises a switching structure, the switching structure is provided with a fusing part, and the at least one fire extinguishing structure is arranged at the fusing part; and / or at least one fire extinguishing structure is arranged at the tab. Therefore, the problem that high-temperature and high-pressure gas and flame heat generated in the fusing process of at least one of the fusing part and the tab spread to the main body part can be solved, so that the thermal runaway problem of short circuit or even explosion of the single battery is solved. Therefore, the problem that adjacent battery monomers are subjected to a chain reaction of thermal runaway can be improved, so that the thermal runaway problem of the battery is improved.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and more specifically, relates to a battery cell, a battery, and an electrical device. Background Art

[0002] In the related art, a battery cell may include an electrode assembly, and the electrode assembly generally has a relatively weak part. During the use of the battery cell, the relatively weak part of the electrode assembly will inevitably fuse, resulting in a sharp increase in temperature in the fused part of the electrode assembly, thereby causing a risk of short circuit and thermal runaway in the electrode assembly. Summary of the Utility Model

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

[0004] In a first aspect, the embodiments of this application provide a battery cell, including:

[0005] An electrode assembly, including a main body part and a tab connected to the main body part;

[0006] A fire extinguishing structure;

[0007] Wherein, the electrode assembly further includes an adapter structure connected to the tab, the adapter structure is provided with a fusing part, and at least one fire extinguishing structure is arranged at the fusing part; and / or, at least one fire extinguishing structure is arranged at the tab.

[0008] In the battery cell provided by the embodiments of this application, by arranging a fire extinguishing structure at at least one of the fusing part of the adapter structure and the tab of the electrode assembly, the fire extinguishing structure can reduce the high temperature generated sharply due to fusing at at least one of the fusing part and the tab, that is, reduce the temperature of the high-temperature and high-pressure gas generated at at least one of the fusing part and the tab, and extinguish the flame generated at at least one of the fusing part and the tab. That is, the fire extinguishing structure can perform temperature reduction and fire extinguishing operations on at least one of the fusing part and the tab. In this way, the problem that the high-temperature and high-pressure gas and flame heat generated during the fusing of at least one of the fusing part and the tab spread to the main body part can be improved, so as to improve the thermal runaway problem of the battery cell short circuit or even explosion. Therefore, the problem that adjacent battery cells are affected by the chain reaction of thermal runaway can be improved, so as to improve the thermal runaway problem of the battery.

[0009] In some embodiments, at least one fire extinguishing structure arranged at the fusing part abuts against the fusing part.

[0010] At least one fire extinguishing structure is placed against the fuse, allowing the fuse to contact the fire extinguishing structure. This allows the fire extinguishing structure to promptly cool the fuse during its operation, quickly suppressing the spread of high-temperature, high-pressure gas and flames generated by the fuse, mitigating thermal runaway reactions such as short circuits and even explosions in the electrode assembly, and improving battery reliability.

[0011] In some embodiments, an orthographic projection of at least one fire extinguishing structure disposed at the fuse portion on the transition structure covers the fuse portion.

[0012] By adopting this technical solution, the fire extinguishing structure can cool and extinguish fires over a large area. Specifically, the fire extinguishing structure can promptly cool and extinguish the fuse at the source, and can also alleviate the problem of high temperature and flames generated during the fuse melting process. This can alleviate thermal runaway issues such as short circuits and even explosions in the electrode assembly, improving battery reliability.

[0013] In some embodiments, the at least one fire extinguishing structure provided at the fuse portion is a first fire extinguishing component, and the orthographic projection of the first fire extinguishing component on the transition structure covers at least a portion of the fuse portion and extends beyond the fuse portion.

[0014] This arrangement ensures that, in its orthographic projection on the adapter structure, one portion of the first fire extinguishing element covers at least a portion of the fuse, while another portion covers the rest of the adapter structure. This allows the first fire extinguishing element to promptly cool the fuse and extinguish fire at the source during its melting process. It also effectively mitigates the risk of high-temperature, high-pressure gas and flames generated during melting from escaping and spreading to the main body of the electrode assembly. This effectively mitigates thermal runaway issues, such as short circuits and even explosions in battery cells, thereby improving battery thermal runaway and enhancing battery reliability.

[0015] In some embodiments, an orthographic projection of the first fire extinguishing element on the transition structure is perpendicular to the first direction; the transition structure is provided with a fuse region, the fuse region penetrates the transition structure along a second direction, the fuse region includes a fuse portion, and the second direction intersects the first direction;

[0016] In the second direction, at least one first fire extinguishing element extends beyond the fuse portion; and / or, in the third direction, at least one first fire extinguishing element extends beyond the fuse portion, and the third direction intersects the first direction and the second direction respectively.

[0017] In this way, the first fire extinguishing element not only cools down the fuse at the source and extinguishes the fire immediately during the process, but also effectively mitigates the risk of high-temperature, high-pressure gas and flames being released during the process. This mitigates thermal runaway issues such as short circuits and even explosions in the electrode assembly, improving battery reliability.

[0018] In some embodiments, the battery cell further includes an insulating structure, and the insulating structure is disposed on the fuse portion.

[0019] By adopting the above technical solution, the insulating structure can provide insulation protection for the fuse part and can also enhance the structural strength of the fuse part.

[0020] In some embodiments, the orthographic projection of the insulating structure on the transition structure covers at least a portion of the fuse portion, and the at least one fire extinguishing structure provided at the fuse portion is a second fire extinguishing component;

[0021] The orthographic projection of at least one second fire extinguishing element on the transition structure is outside the orthographic projection of the insulating structure on the transition structure; at least part of the orthographic projection of at least one second fire extinguishing element on the transition structure covers at least part of the orthographic projection of the insulating structure on the transition structure.

[0022] This arrangement allows the second fire extinguishing element and the insulating structure to be used together to provide temperature reduction and fire extinguishing protection for the fuse. Furthermore, the layout of the fire extinguishing structure at the transition structure is very flexible.

[0023] In some embodiments, the orthographic projection of at least one second fire extinguishing component on the transition structure and the orthographic projection of the insulating structure on the transition structure are both perpendicular to the first direction; the transition structure is provided with a fuse area, the fuse area passes through the transition structure along the second direction, and the fuse area includes a fuse portion; in the third direction, at least one end of the insulating structure is provided with a second fire extinguishing component; wherein the first direction, the second direction and the third direction intersect with each other in pairs.

[0024] By adopting the above technical solution, a second fire extinguishing component is provided at at least one end of the insulating structure roughly in the direction of current flow in the melting area, so that the fire extinguishing structure can effectively cool down and extinguish the fire during the melting process of the melting part, thereby improving the problem of high-temperature and high-pressure gas and flame generated during the melting process of the melting part spreading to the main body.

[0025] In some embodiments, the transition structure includes a first connection part, a second connection part and a third connection part, the first connection part and the second connection part are respectively connected to the pole ear, and the third connection part is connected between the first connection part and the second connection part; a fuse part is provided between the first connection part and the third connection part, and at least one fire extinguishing structure is provided at the fuse part between the first connection part and the third connection part; a fuse part is provided between the second connection part and the third connection part, and at least one fire extinguishing structure is provided at the fuse part between the second connection part and the third connection part.

[0026] By adopting the above technical solution, the fuse parts of the two fuse areas on the transition structure can be cooled and extinguished by the fire extinguishing structure, thereby improving the problem of short circuit or even explosion of the electrode assembly caused by the melting of the fuse part.

[0027] In some embodiments, the fire extinguishing structure at the fuse part between the first connection part and the third connection part is connected to the fire extinguishing structure at the fuse part between the second connection part and the third connection part.

[0028] By adopting the above technical solution, the fire extinguishing structure can be arranged on two fuse areas of the adapter structure at the same time to cool down and extinguish the fire in the two fuse areas.

[0029] In some embodiments, at least one fire extinguishing structure arranged at the fuse part and the adapter structure are distributed in a first direction; the adapter structure is provided with a fuse area penetrating through the adapter structure in a second direction, the fuse area includes a fuse part, and a fuse through hole is arranged through the adapter structure in the first direction, and the fuse part and the fuse through hole are distributed in the second direction; the first direction intersects with the second direction.

[0030] By arranging the fuse through hole, the cross-sectional area of the fuse area is smaller than that of other areas of the adapter structure, so that in the case of overload of the adapter structure, the fuse part in the fuse area can be melted first to disconnect the current of the adapter structure, thereby protecting the circuit.

[0031] In some embodiments, in the second direction, fuse parts are respectively arranged at opposite ends of the fuse through hole;

[0032] And / or, in the second direction, fuse through holes are respectively arranged at opposite ends of the fuse part.

[0033] By adopting the above technical solution, the arrangement of the fuse through hole and the fuse part is very flexible.

[0034] In some embodiments, the tab includes a positive tab and a negative tab, and the adapter structure is electrically connected to the positive tab.

[0035] In some embodiments, the end of the tab connected to the main body part is the connection end, and at least one fire extinguishing structure arranged at the tab is arranged on the connection end.

[0036] By arranging at least one fire extinguishing structure on the connection end, the fire extinguishing structure can be very close to the main body part, so that during the melting process caused by the overload of the tab, the root of the tab close to the main body part can be cooled and extinguished in time, thereby being able to greatly limit the speed at which the high-temperature and high-pressure gas and flame generated during the melting process of the tab spread to the main body part. Therefore, it helps to improve the thermal runaway problem that the main body part of the electrode assembly is short-circuited or even exploded due to the melting of the tab, and improves the reliability of the battery.

[0037] In some embodiments, in the thickness direction of the tab, at least one side of the tab is provided with a fire extinguishing structure.

[0038] With such an arrangement, the layout of the fire extinguishing structure on the tab is very flexible.

[0039] In some embodiments, the fire extinguishing structure includes a core for fire extinguishing and a shell for encapsulating the core.

[0040] With such an arrangement, when the fire extinguishing structure is in a high-temperature environment, the shell of the fire extinguishing structure ruptures, and the core inside the shell can reduce the temperature of the high-temperature and high-pressure gas and extinguish the flame, so as to achieve the effect of cooling and extinguishing the fire.

[0041] In some embodiments, the core is a perfluoromethyl hexanone core; and / or, the shell is a polymer shell.

[0042] With such an arrangement, the fire extinguishing structure can effectively perform the operation of cooling and extinguishing the fire.

[0043] In a second aspect, an embodiment of the present application provides a battery, including battery cells.

[0044] For the battery provided by the embodiment of the present application, by adopting the battery cells involved above, the problem of thermal runaway of the battery can be improved.

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

[0046] For the electrical device provided by the embodiment of the present application, by adopting the battery involved above, the reliability of the battery can be improved, and further the reliability of the electrical device can be improved.

[0047] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

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

[0050] Figure 2 An exploded view of a battery provided for some embodiments of the present application;

[0051] Figure 3 A three-dimensional structure diagram of a battery cell provided for some embodiments of the present application;

[0052] Figure 4 is Figure 3 exploded view of;

[0053] Figure 5 is the exploded view of the adapter structure and the fire extinguishing structure of the battery cell provided by some embodiments of the present application;

[0054] Figure 6 is Figure 5 the schematic diagram of the adapter structure of the battery cell provided by;

[0055] Figure 7 is Figure 5 the schematic diagram of the cooperation of the adapter structure and the fire extinguishing structure of the battery cell provided by;

[0056] Figure 8 is Figure 7 the sectional view along A-A;

[0057] Figure 9 is the exploded view of the adapter structure and the fire extinguishing structure of the battery cell provided by some other embodiments of the present application;

[0058] Figure 10 is Figure 9 the schematic diagram of the cooperation of the adapter structure and the fire extinguishing structure of the battery cell provided by;

[0059] Figure 11 is the exploded view of the adapter structure, the fire extinguishing structure and the insulation structure of the battery cell provided by some other embodiments of the present application;

[0060] Figure 12 is Figure 11 the schematic diagram of the cooperation of the adapter structure, the fire extinguishing structure and the insulation structure of the battery cell provided by;

[0061] Figure 13 is Figure 12 the sectional view along B-B;

[0062] Figure 14 is the cooperation structure diagram of the adapter structure and the fire extinguishing structure of the battery cell provided by some other embodiments of the present application;

[0063] Figure 15 is Figure 14 exploded view of;

[0064] Figure 16 is the cooperation structure diagram of the electrode assembly and the fire extinguishing structure of the battery cell provided by some embodiments of the present application;

[0065] Figure 17 is Figure 16 the enlarged view at C in;

[0066] Figure 18 is Figure 16Cross-sectional view along DD.

[0067] Among them, the reference numerals in the figures are:

[0068] 1000-battery; 2000-controller; 3000-motor; 100-battery cell; 200-housing; 210-first part; 220-second part; 10-electrode assembly; 11-main body; 12-ear; 121-connecting end; 13-transfer structure; 1301-fuse area; 13011-fuse part; 13012-fuse through hole; 131-first connection part; 132-second connection part; 133-third connection part; 20-housing assembly; 21-housing; 22-end cover; 30-electrode terminal; 40-fire extinguishing structure; 40a-first fire extinguishing component; 40b-second fire extinguishing component; 40c-third fire extinguishing component; 50-insulating structure; Z-first direction; Y-second direction; X-third direction. DETAILED DESCRIPTION

[0069] The following describes in detail embodiments of the present application, examples of which 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.

[0070] In the description of this 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 accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0071] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the features.

[0072] In the description of this application, "a plurality of" means more than two, and unless otherwise specifically defined, "more than two" includes two. Accordingly, "a plurality of groups" means more than two groups, including two groups.

[0073] In the description of the present application, unless otherwise clearly specified and defined, terms such as "installed", "connected", "linked", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0074] In the description of the present application, the term "and / or" is merely an association relationship describing associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: the existence of A, the simultaneous existence of A and B, and the existence of B. In addition, in the present application, the character " / " generally represents an "or" relationship between the front and back associated objects.

[0075] Although the present application has been described with reference to preferred embodiments, various improvements can be made to it and components therein can be replaced with equivalents without departing from the scope of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

[0076] In the related art, a battery cell can include a housing assembly, an electrode assembly, and an electrode terminal, and the electrode assembly is disposed within the housing assembly. The electrode assembly includes a main body portion, a tab, and a transfer structure, the tab is connected to the main body portion, and the transfer structure is connected to the tab and the electrode terminal.

[0077] Among them, the electrode assembly generally has a relatively weak part.

[0078] For example, the transfer structure is provided with a relatively weak fusing portion. The fusing portion can be disconnected under overload conditions to provide overload protection for the electrode assembly. In some cases, when the fusing portion is disconnected under overload conditions to provide overload protection for the electrode assembly, the fusing portion will rapidly generate high temperature, and it is inevitable that the heat will spread to the main body portion and the tab of the electrode assembly, resulting in a short circuit of the electrode assembly and then thermal runaway, generating high-temperature and high-pressure gas and flames.

[0079] For example, the tab has a relatively weak part. When the current is too large and the tab is overloaded, the tab will rapidly generate high temperature and fuse, and it is inevitable that the heat will spread to the main body portion of the electrode assembly, resulting in a short circuit of the electrode assembly and then thermal runaway, generating high-temperature and high-pressure gas and flames.

[0080] Therefore, during battery cell use, the weaker parts of the electrode assembly will inevitably fuse, causing the fuse-broken parts of the electrode assembly to rapidly heat up, which can cause the electrode assembly to short-circuit and potentially lead to thermal runaway. Thermal runaway of a battery cell generates high-temperature, high-pressure gases and flames, which can spread to adjacent battery cells, causing a chain reaction of thermal runaway in adjacent cells and ultimately causing thermal runaway of the entire battery.

[0081] Based on the above considerations, embodiments of the present application provide a battery cell, a battery, and an electrical device. By providing a fire extinguishing structure at at least one of the fuse part and the tab of the transition structure of the electrode assembly, the fire extinguishing structure can reduce the high temperature rapidly generated by the melting of at least one of the fuse part and the tab, that is, reduce the temperature of the high-temperature and high-pressure gas generated at at least one of the fuse part and the tab, and extinguish the flame generated at at least one of the fuse part and the tab. In other words, the fire extinguishing structure can cool down and extinguish the fire at at least one of the fuse part and the tab. In this way, the problem of the high-temperature and high-pressure gas and flame heat generated during the melting of at least one of the fuse part and the tab spreading to the main body can be improved, thereby improving the thermal runaway problem of the battery cell short circuit or even explosion. Therefore, the problem of the chain reaction of adjacent battery cells being affected by thermal runaway can be improved, thereby improving the thermal runaway problem of the battery.

[0082] In some embodiments, the battery cells involved in the embodiments of the present application can be used in electrical devices that use battery cells or batteries as power sources.

[0083] 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, such as 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, vehicles may be fuel vehicles, gas vehicles, or new energy vehicles. New energy vehicles may be pure electric vehicles, hybrid vehicles, or extended-range vehicles, and the like. According to the drive mode, vehicles may be front-wheel drive vehicles, rear-wheel drive vehicles, or four-wheel drive vehicles.

[0084] In other embodiments, the battery cells involved in the embodiments of the present application can also be used in energy storage systems that use battery cells or batteries as energy storage elements. The energy storage system may include energy storage containers, energy storage cabinets, etc.

[0085] The battery involved in the embodiments of the present application may be a single physical module including one or more battery cells to provide higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, parallel or in a hybrid connection through a busbar component, and the hybrid connection means that there are both series and parallel connections among the multiple battery cells.

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

[0087] In some embodiments, the battery may be a battery pack, and the battery pack may include a box body and battery cells. As an example, the battery cells may be directly accommodated in the box body. As an example, the battery cells may also first form a battery module and then be accommodated in the box body.

[0088] As an example, multiple battery cells may be fixed to form a battery module by means of cable ties or the like.

[0089] As an example, multiple battery cells may also be fixed to form a battery module by means of end plates, side plates or the like.

[0090] The battery cell involved in the embodiments of the present application refers to the smallest unit for storing and outputting electric energy. Among them, the battery cell may be a secondary battery or a primary battery. The battery cell 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 may be in a cylindrical shape, a flat shape, a cuboid shape or other shapes, etc.

[0091] For the convenience of description, the embodiments of the present application are described by taking the electrical device as a vehicle as an example.

[0092] In some embodiments, please refer to Figure 1 , Figure 1 is a schematic diagram of a vehicle provided by some embodiments of the present application. The vehicle is internally provided with the above-mentioned battery 1000, and the battery 1000 may be arranged at the bottom, head or tail of the vehicle. The battery 1000 may be used for power supply of the vehicle. For example, the battery 1000 may be used as the operating power source of the vehicle. The vehicle may further include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery 1000 to supply power to the motor 3000, for example, for the working power requirements during the start, navigation and driving of the vehicle.

[0093] In some embodiments, the battery 1000 may not only be used as the operating power source of the vehicle, but also be used as the driving power source of the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0094] In some embodiments, please refer to Figure 2 , Figure 2Exploded view of the battery 1000 provided by some embodiments of the present application. The battery 1000 may include a battery box 200 and battery cells 100. The battery box 200 is a structure with a space inside, and the internal space of the battery box 200 is used to accommodate the battery cells 100.

[0095] The battery box 200 may adopt various structures. In some embodiments, the battery box 200 may include a first part 210 and a second part 220. The first part 210 and the second part 220 cover each other and jointly define the internal space of the battery box 200. Among them, the first part 210 may be a hollow structure with an opening at one end, and the second part 220 is a plate-like structure. The second part 220 covers the opening side of the first part 210 so that the first part 210 and the second part 220 jointly define the internal space of the battery box 200. Alternatively, please refer to Figure 2 , both the first part 210 and the second part 220 may be hollow structures with an opening at one end. The opening side of the first part 210 covers the opening side of the second part 220 so that the first part 210 and the second part 220 jointly define the internal space of the battery box 200. Among them, the battery box 200 formed by the first part 210 and the second part 220 may be of various shapes, such as a cylinder, a cuboid, etc.

[0096] In some embodiments, please refer to Figure 2 , multiple battery cells 100 may be connected in series, parallel, or in a hybrid connection to form a whole, and then the whole formed by the multiple battery cells 100 is directly accommodated in the internal space of the battery box 200. In other embodiments, multiple battery cells 100 may also be connected in series, parallel, or in a hybrid connection first, arranged and fixed to form a battery module, and the battery module is accommodated in the internal space of the battery box 200. In still other embodiments, multiple battery cells 100 may also be connected in series, parallel, or in a hybrid connection first, arranged and fixed to form multiple battery modules, and the multiple battery modules are then connected in series, parallel, or in a hybrid connection to form a whole and are accommodated in the internal space of the battery box 200.

[0097] In some embodiments, the battery box 200 of the battery 1000 may be used as a part of the chassis structure of a vehicle. For example, a part of the battery box 200 may become at least a part of the chassis of the vehicle, or a part of the battery box 200 may become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0098] In some embodiments, please refer to Figure 3 and Figure 4 , Figure 3 Stereoscopic structure diagram of the battery cell 100 provided by some embodiments of the present application, Figure 4 is Figure 3 exploded view of. Among them, the battery cell 100 may include an electrode assembly 10.

[0099] The electrode assembly 10 is a component in the battery cell 100 where an electrochemical reaction occurs. Among them, the electrode assembly 10 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and a separator is provided between the positive electrode plate and the negative electrode plate. The parts of the positive electrode plate and the negative electrode plate with active materials constitute the main body 11 of the electrode assembly 10, and the parts of the positive electrode plate and the negative electrode plate without active materials respectively constitute the electrode tabs 12. The electrode tab 12 of the positive electrode plate is the positive electrode tab, and the electrode tab 12 of the negative electrode plate is the negative electrode tab. The positive electrode tab and the negative electrode tab can be located at one end of the main body 11 together or at opposite ends of the main body 11 respectively.

[0100] In the battery cell 100, the number of the electrode assemblies 10 can be one or multiple.

[0101] In some cases, the electrode assembly 10 can also be referred to as a bare battery cell, a wound body, a laminated body, etc.

[0102] In some embodiments, the battery cell 100 may further include an electrolyte, and the electrolyte plays a role in conducting ions between the positive electrode plate and the negative electrode plate. Among them, the electrolyte involved in the embodiments of the present application can be liquid, gel-like or solid.

[0103] In some embodiments, please continue to refer to Figure 3 and Figure 4 , the battery cell 100 may further include a housing assembly 20, and the housing assembly 20 is used to define the internal environment of the battery cell 100, and the housing assembly 20 is used to accommodate the electrode assembly 10 and the electrolyte.

[0104] In some embodiments, please continue to refer to Figure 3 and Figure 4 , the housing assembly 20 may include a housing 21 and an end cap 22. The housing 21 and the end cap 22 are components used to jointly define the internal environment of the battery cell 100, and the internal environment defined by the housing 21 and the end cap 22 is used to accommodate the electrode assembly 10 and the electrolyte. Among them, the housing 21 and the end cap 22 can be independent components. Specifically, the housing 21 has an opening, and the end cap 22 is covered on the opening of the housing 21 to jointly define the internal environment of the battery cell 100 with the housing 21, and isolate the internal environment of the battery cell 100 from the external environment. Or, the housing 21 and the end cap 22 can also be an integrated structure. Specifically, a common connection surface can be formed between the end cap 22 and the housing 21 before the electrode assembly 10 is put into the housing. When the electrode assembly 10 is put into the housing and needs to be encapsulated, then the end cap 22 is covered on the housing 21.

[0105] Among them, the number of the end caps 22 can be one, such as Figure 3 and Figure 4As shown. Alternatively, the number of end caps 22 can also be two, and the two end caps 22 are respectively disposed at opposite ends of the housing 21.

[0106] Among them, the housing 21 can be in the shape of a cylinder, a square, etc., and can be specifically determined according to the specific shape and size of the electrode assembly 10. Moreover, the materials of the housing 21 and the end cap 22 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0107] In some embodiments, please refer to Figure 3 and Figure 4 , the battery cell 100 may further include an electrode terminal 30. The electrode terminal 30 refers to a component having electrical conductivity. The electrode terminal 30 is electrically connected to the electrode assembly 10 and serves as the current transmission end of the battery cell 100 for transmitting current. Among them, the electrode terminal 30 can be, but is not limited to, a pole post.

[0108] In some embodiments, please refer to Figure 3 and Figure 4 , the electrode assembly 10 may further include a transfer structure 13. The transfer structure 13 refers to a metal structure having electrical conductivity, such as, but not limited to, a copper busbar. The transfer structure 13 is disposed within the housing assembly 20.

[0109] Among them, the transfer structure 13 is electrically connected to the electrode terminal 30 and the tab 12 to achieve a conductive connection between the electrode terminal 30 and the electrode assembly 10. In this way, the transfer structure 13 can achieve overcurrent between the electrode assembly 10 and the electrode terminal 30.

[0110] In some embodiments, please continue to refer to Figure 3 and Figure 4 , the electrode terminals 30 are provided in two. The two electrode terminals 30 are respectively a positive electrode terminal and a negative electrode terminal. The transfer structure 13 can also be divided into a positive transfer structure and a negative transfer structure. The positive transfer structure is electrically connected to the positive electrode terminal and the positive tab, and the negative transfer structure is electrically connected to the negative electrode terminal and the negative tab.

[0111] In some embodiments, please continue to refer to Figure 3 and Figure 4 , the electrode terminal 30 is disposed on the housing assembly 20. Specifically, the electrode terminal 30 can be disposed on the housing 21 of the housing assembly 20 or on the end cap 22 of the housing assembly 20.

[0112] Among them, the positive electrode terminal and the negative electrode terminal can be disposed on the housing 21 at the same time. Or, as Figure 4As shown, the positive electrode terminal and the negative electrode terminal are both provided on the end cover 22. Alternatively, one of the positive electrode terminal and the negative electrode terminal is provided on the housing 21, and the other is provided on the end cover 22.

[0113] The positive electrode terminal and the negative electrode terminal may be provided at the same end of the housing assembly 20. For example, Figure 3 and Figure 4 As shown, the positive electrode terminal and the negative electrode terminal are disposed on the end cap 22 at the same end of the housing assembly 20. Alternatively, the positive electrode terminal and the negative electrode terminal can be disposed at opposite ends of the housing assembly 20.

[0114] Please also refer to Figures 3 to 7 、 Figures 16 to 18 , and combined with other drawings. Among them, Figure 5 This is an exploded view of the transfer structure 13 and the fire extinguishing structure 40 of the battery cell 100 provided in some embodiments of the present application. Figure 6 This is a schematic diagram of the adapter structure 13 of the battery cell 100 provided in some embodiments of the present application, specifically a schematic diagram of the adapter structure 13 in the first direction Z, that is, Figure 6 The transition structure 13 shown in FIG is perpendicular to the first direction Z, wherein Figure 6 The cross-section line in FIG. 1 illustrates the fuse portion 13011 . Figure 7 This is a schematic diagram of the coordination of the adapter structure 13 and the fire extinguishing structure 40 of the battery cell 100 provided in some embodiments of the present application, specifically a schematic diagram in the first direction Z, that is, Figure 7 The schematic transition structure 13 and the fire extinguishing structure 40 are perpendicular to the first direction Z, wherein Figure 7 The cross-section line in the figure illustrates the fuse portion 13011, and the dotted line divides the fuse through hole 13012. Figure 16 This is a diagram of the matching structure of the electrode assembly 10 of the battery cell 100 and the fire extinguishing structure 40 provided in some embodiments of the present application. Figure 17 for Figure 16 The enlarged image of point C in the middle, Figure 18 for Figure 16 A cross-sectional view along line DD. The battery cell 100 provided in the embodiment of the present application includes an electrode assembly 10 and a fire extinguishing structure 40. The electrode assembly 10 includes a main body 11 and a tab 12 connected to the main body 11.

[0115] The fire extinguishing structure 40 is a structure made of fire-extinguishing material that has a fire-extinguishing function. Specifically, the fire extinguishing structure 40 can suppress the generation and spread of flames and, during operation, remove heat from high-temperature, high-pressure gases and flames to achieve a cooling and fire-extinguishing function. In other words, the fire extinguishing structure 40 is primarily used for cooling and fire-extinguishing.

[0116] For some possible designs, please also see Figures 3 to 7The electrode assembly 10 further includes a transition structure 13 , which is provided with a fuse portion 13011 , and at least one fire extinguishing structure 40 is provided at the fuse portion 13011 .

[0117] The tab 12 can be a positive tab, and accordingly, the transition structure 13 is a positive transition structure. The tab 12 can also be a negative tab, and accordingly, the transition structure 13 is a negative transition structure.

[0118] The adapter structure 13 is electrically connected to the tab 12. On the one hand, it can ensure the normal operation of the circuit under normal working conditions to a certain extent. On the other hand, in extreme working conditions such as short circuits, the adapter structure 13 needs to be immediately fused to cut off the circuit. Among them, the adapter structure 13 needs to be provided with a fuse area 1301. When an extreme working condition such as a short circuit occurs, the adapter structure 13 needs to be disconnected in the fuse area 1301, so that the circuit connected to the adapter structure 13 is disconnected. Among them, the adapter structure 13 needs to have a sufficient cross-sectional area at the fuse area 1301 to achieve normal power-on operation, but the cross-sectional area cannot be too large so that it can be immediately fused in the event of a short circuit.

[0119] Fusing region 1301 refers to the area of adapter structure 13 that can be disconnected. Fusing portion 13011 is a portion of adapter structure 13, specifically at least a portion of fusing region 1301. It is a component capable of fusing and, when fusing, disconnects the circuit connected to adapter structure 13. Fusing region 1301 includes at least one fusing portion 13011. When fusing portion 13011 in fusing region 1301 disconnects adapter structure 13 at fusing region 1301, disconnecting the circuit.

[0120] At least one fire extinguishing structure 40 is located at fuse 13011, meaning that at least one fire extinguishing structure 40 is located in a position capable of cooling and extinguishing fuse 13011. The at least one fire extinguishing structure 40 located at fuse 13011 can be positioned adjacent to fuse 13011, or it can be located near fuse 13011 and spaced apart from fuse 13011. In other words, the fire extinguishing structure 40 is capable of cooling and extinguishing fuse 13011, which can be understood as being located at fuse 13011.

[0121] At least one fire extinguishing structure 40, which is arranged near the fuse part 13011 and spaced apart from the fuse part 13011, can be attached to other positions of the transition structure 13 except the fuse part 13011; it can also be arranged on other components other than the transition structure 13, for example, it can be arranged on at least one of the insulating structure 50, the shell assembly 20, the pole ear 12, etc. mentioned below.

[0122] At least one fire extinguishing structure 40 is provided at the fuse 13011 to cool and extinguish the high-temperature, high-pressure gas and flame generated by the fuse 13011 during the process. This prevents the high-temperature, high-pressure gas and flame generated during the process from spreading to the main body 11 of the electrode assembly 10, thereby alleviating thermal runaway of the battery cell 10 and improving the reliability of the battery 1000.

[0123] For some possible designs, please also see Figures 16 to 18 At least one fire extinguishing structure 40 is provided at the pole ear 12 .

[0124] At least one fire extinguishing structure 40 is disposed at the tab 12, meaning that the at least one fire extinguishing structure 40 is disposed at a location capable of cooling and extinguishing the tab 12. The at least one fire extinguishing structure 40 disposed at the tab 12 may be in close proximity to the tab 12, or may be disposed near the tab 12 and spaced apart from the tab 12. In other words, the fire extinguishing structure 40 is capable of cooling and extinguishing the tab 12, which can be understood as being disposed at the tab 12.

[0125] At least one fire extinguishing structure 40 disposed near the tab 12 and spaced apart from the tab 12 may be disposed on at least one of the transition structure 13 , the insulating structure 50 mentioned below, the housing assembly 20 , and the like.

[0126] By providing at least one fire extinguishing structure 40 at the pole tab 12, when the pole tab 12 is overloaded and melted, the high-temperature and high-pressure gas and flame generated at the pole tab 12 can be cooled and extinguished, thereby helping to improve the thermal runaway problems such as short circuit or even explosion of the main body 11 of the electrode assembly 10, and improving the reliability of the battery 1000.

[0127] The battery cell 100 provided in the embodiment of the present application has a fire extinguishing structure 40 disposed at at least one of the fusing portion 13011 and the tab 12 of the transition structure 13 of the electrode assembly 10. This allows the fire extinguishing structure 40 to reduce the high temperature rapidly generated at at least one of the fusing portion 13011 and the tab 12 during the fusing process of the electrode assembly 10. Specifically, the fire extinguishing structure 40 reduces the temperature of the high-temperature, high-pressure gas generated at at least one of the fusing portion 13011 and the tab 12, thereby extinguishing the flame generated at at least one of the fusing portion 13011 and the tab 12. In other words, the fire extinguishing structure 40 can cool down and extinguish the fire at at least one of the fusing portion 13011 and the tab 12. This can alleviate the problem of high-temperature, high-pressure gas and flame heat generated during the melting process of at least one of the fuse 13011 and the tab 12 spreading to the main body 11, thereby alleviating the thermal runaway problem caused by a short circuit in the battery cell 100. Consequently, the chain reaction of thermal runaway affecting adjacent battery cells 100 can be alleviated, thereby alleviating the thermal runaway problem of the battery 1000.

[0128] In some embodiments, the fire suppression structure 40 is disposed within the housing assembly 20 .

[0129] In some embodiments, please refer to Figures 5 to 15 , and combined with other drawings. Among them, Figure 8 for Figure 7 Section view along AA. Figure 9 Exploded views of the adapter structure 13 and the fire extinguishing structure 40 of the battery cell 100 provided in other embodiments of the present application, Figure 10 for Figure 9 The schematic diagram of the coordination of the adapter structure 13 and the fire extinguishing structure 40 of the battery cell 100 is provided, specifically a schematic diagram in the first direction Z, that is, Figure 10 The transition structure 13 and the fire extinguishing structure 40 are perpendicular to the first direction Z, wherein Figure 10 The cross-section line in the figure illustrates the fuse portion 13011, and the dotted line divides the fuse through hole 13012. Figure 11 Exploded views of the transfer structure 13, the insulation structure 50, and the fire extinguishing structure 40 of the battery cell 100 provided in some other embodiments of the present application are provided. Figure 12 for Figure 11 The schematic diagram of the coordination of the switching structure 13, the insulation structure 50 and the fire extinguishing structure 40 of the battery cell 100 is provided, specifically a schematic diagram in the first direction Z, that is, Figure 12 The transition structure 13, the insulation structure 50 and the fire extinguishing structure 40 are perpendicular to the first direction Z, wherein Figure 12 The cross-section line in the figure illustrates the fuse portion 13011, and the dotted line divides the fuse through hole 13012. Figure 13 for Figure 12Cross-sectional view along BB. Figure 14 This is a diagram showing the coordination structure of the adapter structure 13 and the fire extinguishing structure 40 of the battery cell 100 provided in some further embodiments of the present application. Figure 15 for Figure 14 The at least one fire extinguishing structure 40 provided at the fuse part 13011 and the transition structure 13 are distributed along the first direction Z, such that the at least one fire extinguishing structure 40 provided at the fuse part 13011 is provided on at least one side of the transition structure 13 along the first direction Z.

[0130] The at least one fire extinguishing structure 40 and the transition structure 13 are distributed along the first direction Z, which means that the effective part or main part of the fire extinguishing structure 40 and the transition structure 13 are distributed along the first direction Z.

[0131] It is understandable that part of the fire extinguishing structure 40 may be distributed along other directions with the transition structure 13. Alternatively, the fire extinguishing structure 40 may be completely distributed along the first direction Z with the transition structure 13.

[0132] Based on the above structure, it should be noted that the projection of the fire extinguishing structure 40 onto the adapter structure 13 along the first direction Z is the orthographic projection of the fire extinguishing structure 40 on the adapter structure 13, that is, the orthographic projection of the fire extinguishing structure 40 on the adapter structure 13 is perpendicular to the first direction Z.

[0133] In some embodiments, please refer to Figures 5 to 15 The adapter structure 13 is provided with the aforementioned fusing region 1301 , which penetrates the adapter structure 13 along the second direction Y. The fusing region 1301 includes at least one aforementioned fusing portion 13011 .

[0134] The fusing region 1301 is a portion of the switching structure 13. When the fusing portion 13011 of the switching structure 13 is blown, the entire fusing region 1301 is blown, thereby disconnecting the circuit.

[0135] The fusing region 1301 is disposed along the second direction Y through the transition structure 13. When the fusing portion 13011 is blown, disconnecting the fusing region 1301, the transition structure 13 can be divided into two portions spaced apart along a third direction X. The third direction X can be roughly the direction of current flow through the fusing region 1301. When the transition structure 13 is divided into two portions spaced apart along the third direction X, current disconnection can be achieved.

[0136] Among them, the first direction Z intersects with the second direction Y, the first direction Z intersects with the third direction X, and the second direction Y intersects with the third direction X. The intersection of the first direction Z and the second direction Y means that the first direction Z and the second direction Y can form an angle greater than 0° and less than 180°, that is, the first direction Z and the second direction Y are not parallel. The first direction Z and the second direction Y can be perpendicular to each other, or they can be non-perpendicular. The first direction Z and the second direction Y can be directions that intersect on the same plane, or they can be directions on planes that are not parallel to each other, and the projection of the second direction Y on the plane where the first direction Z is located can intersect with the first direction Z. Correspondingly, the meaning of the intersection of the first direction Z and the third direction X, and the intersection of the second direction Y and the third direction X can also be interpreted in the same way, and will not be repeated here.

[0137] As an example, the first direction Z is perpendicular to the second direction Y, the first direction Z is perpendicular to the third direction X, and the second direction Y is perpendicular to the third direction X.

[0138] In some cases, the first direction Z may be a height direction of the battery cell 100 , the second direction Y may be a length direction of the battery cell 100 , and the third direction X may be a width direction of the battery cell 100 .

[0139] In some cases, the first direction Z may be a thickness direction of the transition structure 13 .

[0140] In some cases, the tab 12 may be disposed at an end of the main body 11 along the first direction Z. The transition structure 13 may be disposed at an end of the electrode assembly 10 along the first direction Z.

[0141] In some embodiments, please refer to Figures 5 to 7 、 Figures 9 to 12 、 Figure 14 and Figure 15 The fusing area 1301 is provided with a fusing hole 13012 along the first direction Z, and the fusing portion 13011 and the fusing hole 13012 are distributed along the second direction Y.

[0142] The fusing area 1301 is provided with a fusing through-hole 13012 along the first direction Z, which means that the fusing area 13011 also includes the fusing through-hole 13012 , and the fusing through-hole 13012 is provided along the first direction Z and penetrates the transition structure 13 .

[0143] The fuse hole 13012 refers to a through hole formed along the first direction Z through the transfer structure 13 .

[0144] The fuse portion 13011 and the fuse hole 13012 are distributed along the second direction Y, so that the fuse portion 13011 and the fuse hole 13012 pass through the transition structure 13 along the second direction Y. It can be understood that the entity portion in the fuse area 1301 that is sequentially arranged with the fuse hole 13012 along the second direction Y is the fuse portion 13011.

[0145] By setting the fuse hole 13012, the cross-sectional area of the fuse area 1301 is made smaller than the cross-sectional area of other areas of the adapter structure 13. In this way, when the adapter structure 13 is overloaded, the fuse part 13011 of the fuse area 1301 can be fused first to disconnect the current of the adapter structure 13, thereby protecting the circuit.

[0146] In other embodiments, at least a portion of the fuse portion 13011 may be provided with a groove on at least one side along the first direction Z, so that the thickness of the fuse portion 13011 along the first direction Z is smaller than the thickness of other areas of the adapter structure 13 along the first direction Z. This can also cause the fuse portion 13011 to blow faster than other areas of the adapter structure 13 under overload conditions, thereby achieving circuit protection. Based on this, the fuse region 1301 may or may not be provided with the fuse hole 13012.

[0147] In some embodiments, please refer to Figures 5 to 7 、 Figures 11 to 15 In the second direction Y, the two opposite ends of the fuse hole 13012 are respectively provided with fuse parts 13011 .

[0148] It can be understood that a fuse region 1301 may include a plurality of fuse parts 13011 distributed in sequence along the second direction Y, and in the second direction Y, a fuse through hole 13012 may be provided between two adjacent fuse parts 13011.

[0149] As an example, Figures 5 to 7 、 Figures 11 to 15 The fusing region 1301 includes two fusing parts 13011 and a fusing through hole 13012 . The two fusing parts 13011 are sequentially arranged along the second direction Y. In the second direction Y, the fusing through hole 13012 is arranged between the two fusing parts 13011 .

[0150] In some embodiments, please refer to Figure 9 and Figure 10 In the second direction Y, two opposite ends of the fuse portion 13011 are respectively provided with fuse holes 13012 .

[0151] Understandably, a fusing area 1301 may include a plurality of fusing through-holes 13012 arranged in sequence along the second direction Y, and a fusing portion 13011 may be provided between two adjacent fusing through-holes 13012 in the second direction Y.

[0152] As an example, such as Figure 9 and paste Figure 10 , the fusing area 1301 includes two fusing through-holes 13012 and one fusing portion 13011, and the two fusing through-holes 13012 are arranged in sequence along the second direction Y. In the second direction Y, the fusing portion 13011 is provided between the two fusing through-holes 13012.

[0153] Among them, at least one end of the fusing area 1301 along the second direction Y may be a fusing through-hole 13012. Based on this, the fusing through-hole 13012 can penetrate one end of the fusing area 1301 along the second direction Y, so that the fusing through-hole 13012 is a notch provided at one end of the fusing area 1301 along the second direction Y.

[0154] By adopting the above technical solution, the arrangement of the fusing through-holes 13012 and the fusing portions 13011 is very flexible.

[0155] In some embodiments, please refer to Figures 5 to 10 together and in combination with other drawings. At least one fire extinguishing structure 40 provided at the fusing portion 13011 abuts against the fusing portion 13011.

[0156] One fire extinguishing structure 40 provided at the fusing portion 13011 may abut against one fusing portion 13011 or may abut against a plurality of fusing portions 13011.

[0157] For example, as Figures 5 to 8 shown, one fire extinguishing structure 40 provided at the fusing portion 13011 abuts against two fusing portions 13011. For example, as Figure 9 and Figure 10 shown, one fire extinguishing structure 40 provided at the fusing portion 13011 abuts against one fusing portion 13011.

[0158] As an example, as Figures 5 to 10 shown, at least one fire extinguishing structure 40 provided at the fusing portion 13011 abuts against at least one side of the fusing portion 13011 along the first direction Z.

[0159] At least one fire extinguishing structure 40 is abutted against the fuse 13011, allowing the fuse 13011 to contact the fire extinguishing structure 40. Thus, during the melting process of the fuse 13011, the fire extinguishing structure 40 can promptly cool the fuse 13011 and extinguish the fire, thereby quickly suppressing the spread of high-temperature, high-pressure gas and flames generated by the fuse 13011, improving thermal runaway reactions such as short circuits or even explosions in the electrode assembly 10, and improving the reliability of the battery 1000.

[0160] In some embodiments, please refer to Figures 5 to 10 In combination with other drawings, the orthographic projection of at least one fire extinguishing structure 40 provided at the fuse portion 13011 on the transition structure 13 covers the fuse portion 13011 .

[0161] It can be understood that the orthographic projection of a fire extinguishing structure 40 provided at the fuse portion 13011 on the transition structure 13 can completely cover at least one fuse portion 13011 .

[0162] The orthographic projection of the fire extinguishing structure 40 on the adapter structure 13 covers the fuse part 13011, which means that the fuse part 13011 can be located within the orthographic projection of the fire extinguishing structure 40 on the adapter structure 13, that is, the orthographic projection of the fire extinguishing structure 40 on the adapter structure 13 is arranged around the periphery of the fuse part 13011. It can also be understood that the orthographic projection of the fire extinguishing structure 40 on the adapter structure 13 overlaps with all parts of the fuse part 13011.

[0163] As an example, Figures 5 to 8 As shown, the orthographic projection of a fire extinguishing structure 40 on the transition structure 13 covers a plurality of fuses 13011, but does not cover all fuses 13011 on the transition structure 13. As an example, Figure 9 and Figure 10 As shown, the orthographic projection of a fire extinguishing structure 40 on the transition structure 13 covers one fuse part 13011, but does not cover all fuse parts 13011 on the transition structure 13. As an example, Figure 14 and Figure 15 As shown, the orthographic projection of a fire extinguishing structure 40 on the adapter structure 13 covers all the fuse parts 13011 on the adapter structure 13 .

[0164] By adopting the above technical solution, the fire extinguishing structure 40 can cool down and extinguish fires over a large area. Specifically, the fire extinguishing structure 40 can promptly cool down and extinguish the fuse 13011 at the source, and can also alleviate the problem of high temperature and flames generated during the melting process of the fuse 13011. This can alleviate the problem of thermal runaway, such as short circuits or even explosions, in the electrode assembly 10, and improve the reliability of the battery 1000.

[0165] It should be noted that the orthographic projection of the fire extinguishing structure 40 on the adapter structure 13 may only cover the fuse 13011 but not the fuse hole 13012. Alternatively, the orthographic projection of the fire extinguishing structure 40 on the adapter structure 13 may cover both the fuse 13011 and the fuse hole 13012.

[0166] In some embodiments, please refer to Figures 5 to 10 At least one fire extinguishing structure 40 provided at the fuse portion 13011 is a first fire extinguishing member 40a. The orthographic projection of the first fire extinguishing member 40a on the transition structure 13 covers at least a portion of the fuse portion 13011 and extends beyond the fuse portion 13011.

[0167] The orthographic projection of the first fire extinguishing element 40a on the adapter structure 13 covers at least part of the fuse 13011 , which means that the orthographic projection of the first fire extinguishing element 40a on the adapter structure 13 completely covers the fuse 13011 or covers part of the fuse 13011 .

[0168] This arrangement ensures that, in its orthographic projection on the adapter structure 13, a portion of the first fire extinguishing element 40a covers at least a portion of the fuse 13011, while another portion covers the remaining area of the adapter structure 13 excluding the fuse 13011. Thus, the first fire extinguishing element 40a not only promptly cools the fuse 13011 at its source while it is melting, but also effectively mitigates the risk of high-temperature, high-pressure gas and flames generated during the melting process from escaping and spreading to the main body 11 of the electrode assembly 10. This effectively mitigates thermal runaway issues, such as short circuits and even explosions, in the battery cells 100, thereby mitigating thermal runaway issues in the battery 1000 and improving its reliability.

[0169] In some embodiments, please refer to Figures 5 to 10 , and in conjunction with other figures. The orthographic projection of the first fire extinguishing element 40a on the transition structure 13 is perpendicular to the first direction Z. The transition structure 13 is provided with a fusing region 1301 , which extends through the transition structure 13 along the second direction Y. The fusing region 1301 includes at least one fusing portion 13011 .

[0170] Based on this, in some possible designs, such as Figure 10 As shown in FIG. 1 and in combination with other drawings, in the second direction Y, at least one first fire extinguishing member 40a extends beyond the fuse portion 13011 .

[0171] It can be understood that, on the projection plane perpendicular to the first direction Z, a partial projection of at least one first fire extinguishing element 40a covers at least a partial projection of the fuse 13011, and another partial projection is located outside at least one side of the fuse 13011 along the second direction Y.

[0172] Among some possible designs, such as Figure 7 and Figure 10 In the third direction X, at least one first fire extinguishing member 40a extends beyond at least one side of the fuse portion 13011.

[0173] It can be understood that, on the projection plane perpendicular to the first direction Z, a partial projection of at least one first fire extinguishing element 40a covers at least a partial projection of the fuse 13011, and another partial projection is located outside at least one side of the fuse 13011 along the third direction X.

[0174] By employing the above technical solution, at least one first fire extinguishing element 40a has a portion covering at least a portion of the fuse 13011, while another portion covers the remaining area of the adapter structure 13 excluding the fuse 13011. In this way, the first fire extinguishing element 40a not only cools down the fuse 13011 at the source while it is melting, but also effectively mitigates the risk of high-temperature, high-pressure gas and flames being released during the melting process. This mitigates thermal runaway issues such as short circuits and even explosions in the electrode assembly 10, improving the reliability of the battery 1000.

[0175] Furthermore, the third direction X is roughly the direction of current flow through the fuse 13011. By extending the at least one first fire extinguishing element 40a beyond the fuse 13011 along the third direction X, the fire extinguishing structure 40 can extend beyond the fuse 13011 on the side closest to the main body 11 along the third direction X. This effectively prevents the high-temperature, high-pressure gas and flame generated by the fuse 13011 from spreading to the main body 11, and mitigates thermal runaway issues such as short circuits and even explosions of the battery cells 100.

[0176] In some embodiments, as Figure 7 and Figure 10 As shown in the figure, and in combination with other drawings, along the third direction X, the first fire extinguishing element 40a protrudes from the fuse portion 13011 by a length ranging from 0.2 mm to 20 mm on each side, and can specifically be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, 12 mm, 14 mm, 15 mm, 17 mm, 18 mm, 20 mm, etc.

[0177] Such a configuration enables the first fire extinguishing element 40a to effectively improve the problem of high-temperature and high-pressure gas and flame overflow generated during the melting process of the fuse 13011, thereby improving the problem of short circuit or even explosion of the electrode assembly 10.

[0178] In some embodiments, as Figure 7 andFigure 10 As shown in the figure, and in combination with other figures, the size of the fuse portion 13011 in the third direction X ranges from 0.2 mm to 10 mm, and can specifically be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, etc.

[0179] In some embodiments, as Figure 7 and Figure 10 Along the third direction X, the ratio of the size of each side of the first fire extinguishing element 40a extending outside the fuse 13011 to half the size of the fuse 13011 is ≥ 0.2, and can be 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, etc.

[0180] Such a configuration enables the first fire extinguishing element 40a to effectively improve the problem of high-temperature and high-pressure gas and flame overflow generated during the melting process of the fuse 13011, thereby improving the problem of short circuit or even explosion of the electrode assembly 10.

[0181] In some embodiments, see Figure 7 and Figure 10 , and in conjunction with other drawings. On a projection plane perpendicular to the first direction Z, the projection of the fire extinguishing structure 40 completely covers the projection of at least one fuse area 1301. That is, in any direction intersecting the first direction Z, the size of the fire extinguishing structure 40 is greater than or equal to the size of the at least one fuse area 1301.

[0182] With such an arrangement, it is possible to achieve cooling and fire extinguishing in the melting area 1301 over a larger range, thereby reducing the risk of short circuit or even explosion of the electrode assembly 10 .

[0183] In some embodiments, please refer to Figures 11 to 13 The battery cell 100 further includes an insulating structure 50 , which is disposed on the fuse portion 13011 .

[0184] The insulating structure 50 is a structure having insulating properties and is provided on the fuse part 13011 to provide insulation protection for the fuse part 13011, thereby improving the heat spread during the fusing process of the fuse part 13011 to a certain extent.

[0185] The insulating structure 50 may be made of, but is not limited to, insulating glue.

[0186] The fire extinguishing structure 40 may be attached to the fuse part 13011 ; may be attached to the insulating structure 50 ; may be attached to other areas of the transition structure 13 except the fuse part 13011 and the insulating structure 50 .

[0187] By adopting the above technical solution, the insulating structure 50 can provide insulation protection for the fuse part 13011. In addition, the insulating structure 50 can also enhance the structural strength of the fuse part 13011.

[0188] In some embodiments, see Figure 12 , and in combination with other drawings, the orthographic projection of the insulating structure 50 on the transition structure 13 covers at least a portion of the fuse portion 13011 .

[0189] The effective working portion or main portion of the insulating structure 50 and the adapter structure 50 are distributed along the first direction Z. The orthographic projection of the insulating structure 50 on the adapter structure 13 refers to the projection of the insulating structure 50 along the first direction Z onto the adapter structure 13 .

[0190] The insulating structure 50 and the transition structure 13 may be distributed only along the first direction Z. Alternatively, a portion of the insulating structure 50 and the transition structure 13 may also be distributed along other directions. As an example, Figures 11 to 13 As shown, the insulating structure 50 is disposed around the outer periphery of the fuse portion 13011 in the third direction X.

[0191] The orthographic projection of the insulating structure 50 on the transition structure 13 may cover at least one fuse portion 13011 , and the orthographic projection of the insulating structure 50 on the transition structure 13 may also cover part of the fuse portion 11 .

[0192] In this way, the insulating structure 50 can provide insulation protection for the fuse part 13011. In addition, the insulating structure 50 can also enhance the structural strength of the fuse part 13011.

[0193] In some embodiments, see Figure 12 , and in conjunction with other drawings, the orthographic projection of the insulating structure 50 on the transfer structure 13 exceeds the outside of the fuse portion 13011 .

[0194] As an example, see Figure 12 , and in combination with other drawings, the orthographic projection of the insulating structure 50 on the transfer structure 13 extends beyond the fuse portion 13011 along the second direction Y.

[0195] As an example, see Figure 12 , and in combination with other drawings, the orthographic projection of the insulating structure 50 on the transfer structure 13 extends beyond the fuse portion 13011 along the third direction X.

[0196] Such a configuration allows the insulating structure 50 to cover the fuse part 13011 over a larger area, thereby better insulating and protecting the fuse part 13011 .

[0197] In some embodiments, see Figure 12, and in combination with other drawings. Along the third direction X, the dimensions of the insulating structure 50 beyond each side of the fusing part 13011 range from 0.2 mm to 20 mm, and specifically can be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, 12 mm, 14 mm, 15 mm, 17 mm, 18 mm, 20 mm, etc.

[0198] With such a setting, the insulating structure 50 can effectively achieve insulation protection for the fusing part 13011.

[0199] In some embodiments, as Figure 12 shown, and in combination with other drawings. The dimension range of the insulating structure 50 in the third direction X is 2 mm to 20 mm, and specifically can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, 11 mm, 12 mm, 13 mm, 14 mm, 15 mm, 16 mm, etc.

[0200] In some embodiments, as Figures 11 to 13 , and in combination with other drawings. Along the first direction Z, the dimension range of the insulating structure 50 provided on each side of the fusing part 13011 is 0.2 mm to 3 mm, and specifically can be 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 1 mm, 2 mm, 3 mm, etc.

[0201] With such a setting, the insulating structure 50 can achieve a better insulation protection effect on the fusing part 13011.

[0202] In some embodiments, as Figures 11 to 13 shown, and in combination with other drawings. The orthographic projection of at least one second fire extinguishing member 40b on the transfer structure 13 is located outside the orthographic projection of the insulating structure 50 on the transfer structure 13.

[0203] In some other embodiments, at least part of the orthographic projection of at least one second fire extinguishing member 40b on the transfer structure 13 covers at least part of the orthographic projection of the insulating structure 50 on the transfer structure 13.

[0204] With such a setting, the second fire extinguishing member 40b and the insulating structure 50 can be used in cooperation to achieve cooling and fire extinguishing protection for the fusing part 13011. Moreover, the layout of the fire extinguishing structure 40 at the transfer structure 13 is very flexible.

[0205] In some embodiments, please refer to Figures 11 to 13 , and in combination with other drawings. The orthographic projection of at least one second fire extinguishing member 40b on the transfer structure 13 and the orthographic projection of the insulating structure 50 on the transfer structure 13 are both perpendicular to the first direction Z.

[0206] The transition structure 13 is provided with a fusing area 1301 which penetrates the transition structure 13 along the second direction Y. The fusing area 1301 includes at least one fusing portion 13011. In the third direction X, at least one end of the insulating structure 50 is provided with a second fire extinguishing element 40b.

[0207] The third direction X may be roughly the direction in which the current passes through the fuse portion 13011 .

[0208] By adopting the above technical solution, a second fire extinguishing component 40b is provided at at least one end of the insulating structure 50 roughly in the direction of current passing through the melting area 1301, so that the fire extinguishing structure 40 can effectively cool down and extinguish the fire during the melting process of the melting part 13011, thereby improving the problem of high-temperature and high-pressure gas and flame generated during the melting process of the melting part 13011 spreading to the main body 11.

[0209] Furthermore, the provision of the second fire extinguishing element 40 b does not increase the overall thickness of the adapter structure 13 , the insulating structure 50 and the fire extinguishing structure 40 , thereby effectively maintaining a high energy density of the battery cell 100 .

[0210] In the third direction X, the second fire extinguishing components 40b at the two opposite ends of the insulation structure 50 may be connected together or provided separately.

[0211] The first fire extinguishing element 40a and the second fire extinguishing element 40b may be connected or spaced apart from each other.

[0212] In some embodiments, please refer to Figure 5 , Figure 8 , Figure 9 , Figure 10 and Figure 13 In the first direction Z, a fire extinguishing structure 40 is provided on one side or two opposite sides of the adapter structure 13 .

[0213] By adopting the above technical solution, the layout of the fire extinguishing structure 40 at the transfer structure 13 is very flexible.

[0214] Furthermore, when fire extinguishing structures 40 are provided on opposite sides of the adapter structure 13 along the first direction Z, the efficiency of the fire extinguishing structures 40 in cooling and extinguishing the fuse 13011 can be improved, thereby effectively preventing the high-temperature, high-pressure gas and flames generated during the melting process of the fuse 13011 from spreading to the main body 11. This can significantly reduce the risk of short circuiting or even exploding the electrode assembly 10, thereby improving the reliability of the battery 1000. In the first direction Z, the fire extinguishing structures 40 on opposite sides of the adapter structure 13 can be connected together or provided separately.

[0215] In some embodiments, please refer to Figures 5 to 12 , and in conjunction with other drawings. The transition structure 13 includes a first connection portion 131, a second connection portion 132, and a third connection portion 133. The first connection portion 131 and the second connection portion 132 are respectively connected to the tab 12, and the third connection portion 133 is connected between the first connection portion 131 and the second connection portion 132. A fuse portion 13011 is provided between the first connection portion 131 and the third connection portion 133, and a fuse portion 13011 is provided between the second connection portion 132 and the third connection portion 133. At least one fire extinguishing structure 40 is provided at the fuse portion 13011 between the first connection portion 131 and the third connection portion 133, and at least one fire extinguishing structure 40 is provided at the fuse portion 13011 between the second connection portion 132 and the third connection portion 133.

[0216] The first connecting portion 131, the second connecting portion 132, and the third connecting portion 133 are three parts of the adapter structure 13. The first connecting portion 131 and the second connecting portion 132 are parts of the adapter structure 13 for electrically connecting to the tab 12, and the third connecting portion 133 is part of the adapter structure 13 for electrically connecting to the electrode terminal 30.

[0217] The third connection portion 133 is connected between the first connection portion 131 and the second connection portion 132. The first connection portion 131 and the second connection portion 132 are respectively connected to the electrode tab 12. A fuse portion 13011 is provided between the first connection portion 131 and the third connection portion 133, and a fuse portion 13011 is provided between the second connection portion 132 and the third connection portion 133. In this way, the current in the electrode assembly 10 can be divided into two branches: one branch first passes through the first connection portion 131, then passes through the fuse portion 13011 between the first and third connection portions 131, 133, and finally passes through the third connection portion 133 to reach the electrode terminal 30; the other branch first passes through the second connection portion 132, then passes through the fuse portion 13011 between the second and third connection portions 132, 133, and finally passes through the third connection portion 133 to reach the electrode terminal 30. Based on this, the provision of the first and second connection portions 131, 132 allows the adapter structure 13 to pass a relatively large current.

[0218] At least one fire extinguishing structure 40 is provided at the fuse section 13011 between the first connection section 131 and the third connection section 133, and can be used to cool down and extinguish the fire at the fuse section 13011 between the first connection section 131 and the third connection section 133. At least one fire extinguishing structure 40 is provided at the fuse section 13011 between the second connection section 132 and the third connection section 133, and can be used to cool down and extinguish the fire at the fuse section 13011 between the second connection section 132 and the third connection section 133.

[0219] It can be understood that a fuse region 1301 is provided between the first connection portion 131 and the third connection portion 133 , and a fuse region 1301 is also provided between the second connection portion 132 and the third connection portion 133 .

[0220] By adopting the above technical solution, the fuse parts 13011 of the two fuse areas 1301 on the adapter structure 13 can be cooled and extinguished by the fire extinguishing structure 40, thereby improving the problem of short circuit or even explosion of the electrode assembly 10 caused by the melting of the fuse part 13011.

[0221] In some embodiments, please refer to Figure 14 and Figure 15 The fire extinguishing structure 40 at the fuse part 13011 between the first connection part 131 and the third connection part 133 is connected to the fire extinguishing structure 40 at the fuse part 13011 between the second connection part 132 and the third connection part 133 .

[0222] It can be understood that one fire extinguishing structure 40 can be provided at the fuse portion 13011 between the first connection portion 131 and the third connection portion 133 , and at the fuse portion 13011 between the second connection portion 132 and the third connection portion 133 .

[0223] By adopting the above technical solution, the fire extinguishing structure 40 can be simultaneously provided on the two fusing areas 1301 of the adapter structure 13 to achieve temperature reduction and fire extinguishing of the two fusing areas 1301 .

[0224] In other embodiments, the two fuse areas 1301 can achieve cooling and fire extinguishing through different fire extinguishing structures 40, that is, the fire extinguishing structure 40 at the fuse part 13011 between the first connection part 131 and the third connection part 133 and the fire extinguishing structure 40 at the fuse part 13011 between the second connection part 132 and the third connection part 133 are independent of each other and are distributed at intervals.

[0225] For the convenience of description, the at least one fire extinguishing structure 40 provided at the electrode ear 12 is defined as a third fire extinguishing component 40 c.

[0226] In some embodiments, please refer to Figures 16 to 18 The end of the tab 12 connected to the main body 11 is a connecting end 121 , and at least one fire extinguishing structure 40 provided at the tab 12 is provided on the connecting end 121 .

[0227] The connecting end portion 121 refers to a portion of the tab 12 that is used to connect to the main body 11 .

[0228] It can be understood that the third fire extinguishing component 40 c is provided on the connecting end portion 121 .

[0229] By providing at least one fire extinguishing structure 40 on the connecting end portion 121, the fire extinguishing structure 40 can be very close to the main body portion 11, so that during the process of the tab 12 being overloaded and fusing, the root of the tab 12 close to the main body portion 11 can be cooled and extinguished in time, thereby being able to largely limit the speed at which the high-temperature and high-pressure gas and flame generated during the fusing of the tab 12 spread to the main body portion 11. Therefore, it helps to improve the thermal runaway problem of the short circuit or even explosion of the main body portion 11 of the electrode assembly 10 due to the fusing of the tab 12, and improves the reliability of the battery 1000.

[0230] In some embodiments, please refer to Figures 16 to 18 , and in combination with other drawings. In the thickness direction of the tab 12, at least one side of the tab 12 is provided with a fire extinguishing structure 40.

[0231] Among them, as Figure 17 and Figure 18 shown, fire extinguishing structures 40 are respectively provided on opposite sides of the tab 12 in the thickness direction. Alternatively, a fire extinguishing structure 40 is provided on one side of the tab 12 in the thickness direction.

[0232] With such a setting, the layout of the fire extinguishing structure 40 on the tab 12 is very flexible.

[0233] Moreover, when fire extinguishing structures 40 are respectively provided on opposite sides of the tab 12 in the thickness direction, the fire extinguishing structure 40 can perform the cooling and extinguishing operation to a relatively high degree when the tab 12 fuses, thereby improving the problem of the high temperature and flame generated when the tab 12 fuses spreading to the main body portion 11, reducing the thermal runaway risk of the short circuit or even explosion of the main body portion 11, and improving the reliability of the battery 1000.

[0234] Among them, when at least one fire extinguishing structure 40 is provided on the connecting end portion 121, that at least one side of the tab 12 is provided with a fire extinguishing structure 40 in the thickness direction of the tab 12 means that at least one side of the connecting end portion 121 in the thickness direction is provided with a fire extinguishing structure 40.

[0235] Specifically, as Figure 17 shown, in the thickness direction of the tab 12, at least one side of the connecting end portion 121 is provided with a fire extinguishing structure 40. Among them, the thickness direction of the tab 12 at the connecting end portion 121 is parallel to the third direction X above, the width direction of the tab 12 at the connecting end portion 121 is parallel to the second direction Y above, and the height direction of the tab 12 at the connecting end portion 121 is parallel to the first direction Z above.

[0236] In some embodiments, please refer to Figures 16 to 18, and in combination with other drawings. In the width direction of the tab 12, the ratio of the size of the fire extinguishing structure 40 to the size of the tab 12 ranges from 0.8 to 1.2, and specifically can be 0.8, 0.9, 1.0, 1.1, 1.2, etc.

[0237] With such a setting, the fire extinguishing structure 40 can preferably cool down and extinguish the tab 12 to improve the risk of thermal runaway such as short circuit or even explosion of the main body 11.

[0238] Among them, in combination with Figure 4 , Figures 16 to 18 , the thickness direction of the tab 12 is substantially the same as the third direction X, and the width direction of the tab 12 is substantially the same as the second direction Y.

[0239] In some embodiments, please refer to Figures 16 to 18 , and in combination with other drawings. In the length direction of the tab 12, the size range of the fire extinguishing structure 40 is 0.5 mm to 10 mm, and specifically can be 0.5 mm, 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 10 mm, etc.

[0240] As an example, as Figure 18 shown, in the length direction of the tab 12, the size of the fire extinguishing structure 40 is the size of the fire extinguishing structure 40 in the first direction Z.

[0241] With such a setting, the fire extinguishing structure 40 can preferably cool down and extinguish the part of the tab 12 where fusing is likely to occur to improve the thermal runaway problem of short circuit or even explosion of the main body 11.

[0242] In some embodiments, the fire extinguishing structure 40 includes a core for extinguishing fire and a shell for encapsulating the core.

[0243] With such a setting, when the fire extinguishing structure 40 is in a high-temperature environment, the shell of the fire extinguishing structure 40 ruptures, and the core in the shell can reduce the temperature of the high-temperature and high-pressure gas and extinguish the flame to achieve the effect of cooling down and extinguishing the fire.

[0244] In some embodiments, the core is a perfluoromethyl hexanone core.

[0245] The perfluoromethyl hexanone core refers to a core made of perfluoromethyl hexanone material.

[0246] With such a setting, when the fire extinguishing structure 40 is in a high-temperature environment and the capsule shell of the fire extinguishing structure 40 ruptures, the perfluoropentanone material in the perfluoropentanone capsule core can decompose into fluorine, oxygen, and carbon atoms at high temperatures. These atoms can undergo free radical reactions with the high-temperature and high-pressure gas and hydrogen in the flame to obtain stable compounds, thereby effectively suppressing the spread of the flame. Moreover, heat can be carried away during the decomposition process of the perfluoropentanone material to lower the temperature of the high-temperature and high-pressure gas and the flame, thus suppressing the generation of the flame. Therefore, the fire extinguishing structure 40 can suppress the generation and spread of the flame and achieve the effect of cooling and extinguishing the fire.

[0247] In some embodiments, the capsule shell is a polymer capsule shell.

[0248] The polymer capsule shell refers to a capsule shell made of polymer materials. Among them, the polymer materials can include one or more of polyester, polyurethane, phenolic resin, urea-formaldehyde resin, polyurea resin, polymer silicon, natural source polymers, acrylic resin, and epoxy resin.

[0249] The setting of the polymer capsule shell enables the capsule shell to provide a certain degree of protection for the capsule core and rupture in a high-temperature environment, allowing the capsule core to perform the operation of cooling and extinguishing the fire.

[0250] In some embodiments, the fire extinguishing structure 40 includes microcapsules, and the microcapsules include the above-mentioned capsule shell and the above-mentioned capsule core.

[0251] In some embodiments, the number of microcapsules is multiple, and the multiple microcapsules can be fixed by a polymer adhesive or other adhesives.

[0252] Specifically, the polymer adhesive fixes the capsule shells of the multiple microcapsules.

[0253] In some embodiments, the multiple microcapsules can form the fire extinguishing layer of the fire extinguishing structure 40. The fire extinguishing structure 40 can also include an adhesive layer, and the adhesive layer is disposed on the fire extinguishing layer and is used for bonding.

[0254] In some embodiments, the fire extinguishing structure 40 can further include a substrate, and the microcapsules can be disposed on the coating of the substrate to form the fire extinguishing layer.

[0255] In some embodiments, in the fire extinguishing structure 40, the weight ratio range of perfluoropentanone to the polymer material is 20% to 90%, and specifically, it can be 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, etc.

[0256] With such a setting, the fire extinguishing structure 40 has a relatively large perfluoropentanone content, thus having a better cooling and extinguishing effect.

[0257] In some embodiments, in the fire extinguishing structure 40 , 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.

[0258] In some embodiments, the overall thickness of the fire extinguishing structure 40 ranges from 0.2 mm to 10 mm, that is, the sum of the thicknesses of the fire extinguishing layer and the adhesive layer ranges from 0.2 mm to 10 mm, and can specifically be 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.

[0259] 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.

[0260] Such a configuration enables the fire extinguishing layer to have a more appropriate thickness, thereby enabling the fire extinguishing structure 40 to have a smaller volume and a better fire extinguishing effect.

[0261] In some embodiments, the thickness of the adhesive layer ranges from 0.02 mm to 2 mm, and specifically can be 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.

[0262] In some embodiments, the thickness of the fire extinguishing structure 40 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.

[0263] In some embodiments, there are multiple tabs 12 , and the multiple tabs 12 are divided into positive tabs 12 and negative tabs 12 . The transition structure 13 is electrically connected to the positive tab 12 .

[0264] It is understandable that the above-mentioned transition structure 13 can be a positive electrode transition structure 13. Based on this, at least part of the fire extinguishing structure 40 can be provided on the positive electrode transition structure 13 to achieve cooling and fire extinguishing of the fuse part 13011 on the positive electrode transition structure 13.

[0265] It should be noted here that when the positive electrode transfer structure 13 is overloaded and the fusing part 13011 on the positive electrode transfer structure 13 is fusing, it is very easy to generate extremely high temperatures and even flames. By providing the fire extinguishing structure 40, it is possible to cool down and extinguish the fusing part 13011 on the positive electrode transfer structure 13, which can improve the problem that the high-temperature and high-pressure gas and flames generated during the fusing process of the fusing part 13011 spread to the electrode assembly 10, reduce the risk of thermal runaway such as short circuit or explosion of the electrode assembly 10, and improve the reliability of the battery 1000.

[0266] Please refer to Figure 2 and in combination with other drawings. The battery 1000 provided by the embodiment of the present application includes a battery cell 100. Among them, the battery cell 100 in this embodiment is the same as the battery cell 100 in the previous embodiment. For specific details, please refer to the relevant description of the battery cell 100 in the previous embodiment, which will not be elaborated here.

[0267] The battery 1000 provided by the embodiment of the present application can improve the thermal runaway problem of the battery 1000 by adopting the battery cell 100 involved above.

[0268] Please refer to Figure 1 The electrical device provided by the embodiment of the present application includes a battery 1000. Among them, the battery 1000 in this embodiment is the same as the battery 1000 in the previous embodiment. For specific details, please refer to the relevant description of the battery 1000 in the previous embodiment, which will not be elaborated here.

[0269] The electrical device provided by the embodiment of the present application can improve the reliability of the battery 1000 by adopting the battery 1000 involved above, and further improve the reliability of the electrical device.

[0270] As one of the embodiments of the present application, as Figures 3 to 8 shown, the battery cell 100 includes an electrode assembly 10 and a fire extinguishing structure 40. The electrode assembly 10 includes a main body part 11, a tab 12 connected to the main body part 11, and a transfer structure 13 connected to the tab 12. The transfer structure 13 is provided with a fusing area 1301, and the fusing area 1301 runs through the transfer structure 13 along the second direction Y. The fusing part 1401 includes a fusing part 13011. Fire extinguishing structures 40 are respectively provided on opposite sides of the fusing area 1301 along the first direction Z. On the projection plane perpendicular to the first direction Z, the fire extinguishing structure 40 completely covers the fusing area 1301, and the fire extinguishing structure 40 extends beyond the opposite sides of the fusing area 1301 along the third direction X.

[0271] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that, Comprising: An electrode assembly including a main body portion and a tab connected to the main body portion; An extinguishing structure; Wherein, the electrode assembly further includes an adapter structure connected to the tab, the adapter structure is provided with a fusing portion, and at least one of the extinguishing structures is disposed at the fusing portion; and / or, at least one of the extinguishing structures is disposed at the tab.

2. The battery cell according to claim 1, wherein At least one of the extinguishing structures disposed at the fusing portion abuts against the fusing portion.

3. The battery cell according to claim 1, characterized in that, The orthographic projection of at least one of the extinguishing structures disposed at the fusing portion on the adapter structure covers the fusing portion.

4. The battery cell according to any one of claims 1-3, characterized in that, At least one of the extinguishing structures disposed at the fusing portion is a first extinguishing member, and the orthographic projection of the first extinguishing member on the adapter structure covers at least a part of the fusing portion and extends beyond the fusing portion.

5. The battery cell according to claim 4, wherein, The orthographic projection of the first extinguishing member on the adapter structure is perpendicular to a first direction; the adapter structure is provided with a fusing area that penetrates the adapter structure along a second direction, the fusing area includes the fusing portion, and the second direction intersects the first direction; In the second direction, at least one of the first extinguishing members extends beyond the fusing portion; and / or, in a third direction, at least one of the first extinguishing members extends beyond the fusing portion, and the third direction intersects the first direction and the second direction respectively.

6. The battery cell according to any one of claims 1-3, characterized in that, The battery cell further includes an insulating structure disposed on the fusing portion.

7. The battery cell according to claim 6, wherein, The orthographic projection of the insulating structure on the adapter structure covers at least a part of the fusing portion, and at least one of the extinguishing structures disposed at the fusing portion is a second extinguishing member; The orthographic projection of at least one of the second extinguishing members on the adapter structure is located outside the orthographic projection of the insulating structure on the adapter structure; The orthographic projection of at least one of the second extinguishing members on the adapter structure at least partially covers the orthographic projection of the insulating structure on the adapter structure.

8. The battery cell according to claim 7, wherein, The orthographic projection of at least one of the second extinguishing members on the adapter structure and the orthographic projection of the insulating structure on the adapter structure are both perpendicular to the first direction; the adapter structure is provided with a fusing area that penetrates the adapter structure along the second direction, and the fusing area includes the fusing portion; In the third direction, at least one end of the insulating structure is provided with the second extinguishing member; wherein, the first direction, the second direction and the third direction intersect pairwise.

9. The battery cell according to any one of claims 1-3, characterized in that, The adapter structure includes a first connecting portion, a second connecting portion and a third connecting portion. The first connecting portion and the second connecting portion are respectively connected to the tab, and the third connecting portion is connected between the first connecting portion and the second connecting portion; a fusing portion is provided between the first connecting portion and the third connecting portion, and at least one of the extinguishing structures is disposed at the fusing portion between the first connecting portion and the third connecting portion; a fusing portion is provided between the second connecting portion and the third connecting portion, and at least one of the extinguishing structures is disposed at the fusing portion between the second connecting portion and the third connecting portion.

10. The battery cell according to claim 9, characterized in that, The fire extinguishing structure at the fuse portion provided between the first connection portion and the third connection portion is connected to the fire extinguishing structure at the fuse portion provided between the second connection portion and the third connection portion.

11. The battery cell according to any one of claims 1-3, characterized in that, At least one of the fire extinguishing structures and the transition structure provided at the fuse portion is distributed along a first direction; the transition structure is provided with a fuse area penetrating the transition structure along a second direction, the fuse area includes the fuse portion, and a fuse through-hole is provided through-going along the first direction, the fuse portion and the fuse through-hole are distributed along the second direction; the first direction intersects with the second direction.

12. The battery cell according to claim 11, characterized in that, In the second direction, the fuse parts are respectively provided at opposite ends of the fuse through hole; And / or, in the second direction, the fuse holes are respectively provided at two opposite ends of the fuse portion.

13. The battery cell according to any one of claims 1-3, characterized in that, The tabs include a positive tab and a negative tab, and the transfer structure is electrically connected to the positive tab.

14. The battery cell according to any one of claims 1-3, characterized in that, The end of the tab connected to the main body is a connecting end, and the at least one fire extinguishing structure provided at the tab is provided on the connecting end.

15. The battery cell according to any one of claims 1-3, characterized in that, The fire extinguishing structure is provided on at least one side of the tab in the thickness direction of the tab.

16. The battery cell according to any one of claims 1-3, characterized in that, The fire extinguishing structure comprises a capsule core for extinguishing fire and a capsule shell for encapsulating the capsule core.

17. The battery cell according to claim 16, characterized in that, The capsule core is a perfluorohexanone capsule core; and / or the capsule shell is a polymer capsule shell.

18. A battery, characterized in that, The invention comprises a battery cell according to any one of claims 1 to 17.

19. An electrical device, characterized in that, Comprising a battery according to claim 18.

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