Battery monomer, battery and electric equipment

Abstract

The utility model provides a battery monomer, a battery and electric equipment, the battery monomer comprises an electrode assembly, a shell, an end cover assembly, a sealing cover and a gas adsorption component, the end cover assembly covers the shell and forms a first accommodating cavity for accommodating the electrode assembly with the shell in an enclosing manner, the sealing cover is connected to the end cover assembly and forms a second accommodating cavity with the end cover assembly in an enclosing manner, and the gas adsorption component is arranged in the second accommodating cavity. According to the battery monomer provided by the invention, the electrode assembly is accommodated in the first accommodating cavity, and the gas adsorption component is accommodated in the second accommodating cavity, so that gas generated by the electrode assembly can enter the second accommodating cavity through the first accommodating cavity, and the gas adsorption component can be adsorbed to the second accommodating cavity through the second accommodating cavity. The gas adsorption component can adsorb gas, so that the condition that the internal pressure of the battery monomer is too high is effectively improved, and the safety performance of the battery monomer is effectively improved.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor related to their development.

[0003] Batteries usually include battery cells. In the development process of battery technology, how to improve the safety performance of battery cells is a technical problem that needs to be solved urgently in battery technology. Utility Model Content

[0004] One of the purposes of the embodiments of the present application is to provide a battery cell, a battery and an electrical device, aiming to solve the technical problem of poor safety performance of battery cells in the related art.

[0005] In order to solve the above technical problems, the technical solution adopted in the embodiment of the present application is: a battery cell is provided, comprising:

[0006] Electrode assembly;

[0007] case;

[0008] An end cap assembly, which is covered on the shell and enclosed with the shell to form a first cavity for accommodating the electrode assembly;

[0009] A sealing cover connected to the end cover assembly and enclosed with the end cover assembly to form a second cavity, wherein the second cavity is communicated with the first cavity;

[0010] The gas adsorption component is accommodated in the second chamber.

[0011] The beneficial effects of the battery cell provided by the embodiment of the present application are as follows: the end cover assembly in the battery cell provided by the embodiment of the present application is combined with the shell to form a first cavity and is combined with the cover to form a second cavity, the second cavity is connected to the first cavity, and by placing the electrode assembly in the first cavity and the gas adsorption component in the second cavity, the gas generated by the electrode assembly can enter the second cavity through the first cavity, and the gas adsorption component can adsorb the gas, thereby effectively improving the situation where the internal pressure of the battery cell is too high, and effectively improving the safety performance of the battery cell.

[0012] In some embodiments of the present application, the cover is detachably connected to the end cover assembly.

[0013] By adopting the above technical solution, the assembly operation of the gas adsorption component is facilitated, and the assembly efficiency of the battery cell is effectively improved.

[0014] In some embodiments of the present application, the battery cell further includes a snap-fit ​​structure, and the cover and the end cover assembly are connected via the snap-fit ​​structure.

[0015] By adopting the above technical solution, it is easier to assemble the gas adsorption component, and the assembly efficiency of the battery cell is further improved.

[0016] In some embodiments of the present application, the snap-fit ​​structure includes a snap-fit ​​portion and a snap-fit ​​portion, the snap-fit ​​portion is arranged in one of the end cover assembly and the cover, the snap-fit ​​portion is arranged in the other of the end cover assembly and the cover, and the snap-fit ​​portion is snap-fitted to the snap-fit ​​portion.

[0017] By adopting the above technical solution, it is easier to assemble the gas adsorption component, and the assembly efficiency of the battery cell is further improved.

[0018] In some embodiments of the present application, the end cover assembly is provided with a pressure relief hole, and the pressure relief hole is used to connect the first cavity and the external environment of the battery cell.

[0019] By adopting the above technical solution, when the internal pressure of the battery cell is too high, the gas can be discharged to the external environment of the battery cell through the pressure relief hole, which effectively reduces the risk of explosion of the battery cell, thereby further improving the safety performance of the battery cell.

[0020] In some embodiments of the present application, at least a portion of the second cavity is disposed opposite to the pressure relief hole along a first direction, and the first direction is parallel to a thickness direction of the end cover assembly.

[0021] By adopting the above technical solution, it is easier for the gas adsorption component to adsorb gas, thereby improving the gas adsorption efficiency, further improving the situation where the internal pressure of the battery cell is too high, and thus further improving the safety performance of the battery cell.

[0022] In some embodiments of the present application, the end cover assembly includes a cover body and an insulating member, the cover body is covered on the shell and is provided with a pressure relief hole, the insulating member is arranged on the side of the cover body facing the electrode assembly, the sealing cover is connected to the insulating member and is enclosed with the insulating member to form a second cavity, and the insulating member is provided with a through hole, which is used to connect the second cavity and the pressure relief hole.

[0023] By adopting the above technical solution, when the internal pressure of the battery cell is too high, the gas can be discharged to the external environment of the battery cell through the second cavity, the through hole and the pressure relief hole in sequence, so that the battery cell has good pressure relief efficiency, effectively reducing the risk of explosion of the battery cell, thereby further improving the safety performance of the battery cell.

[0024] In some embodiments of the present application, at least a portion of the through hole protrudes from the side of the cover toward the outside of the second cavity to connect the first cavity and the pressure relief hole.

[0025] By adopting the above technical scheme, when the internal pressure of the battery cell is too high, the gas can not only be discharged to the external environment of the battery cell through the second cavity, the through hole and the pressure relief hole in sequence, but also be discharged to the external environment of the battery cell through the first cavity, the through hole and the pressure relief hole in sequence, which effectively increases the pressure relief area of ​​the battery cell, improves the pressure relief efficiency of the battery cell, and effectively reduces the risk of explosion of the battery cell, thereby further improving the safety performance of the battery cell.

[0026] In some embodiments of the present application, the second cavity is disposed on one side of the pressure relief hole along a second direction, and the second direction is perpendicular to the thickness direction of the end cover assembly.

[0027] By adopting the above technical solution, it is easier for the gas adsorption component to adsorb gas, thereby improving the gas adsorption efficiency, further improving the situation where the internal pressure of the battery cell is too high, and thus further improving the safety performance of the battery cell.

[0028] In some embodiments of the present application, there are multiple covers, and the multiple covers and the end cover assembly are combined to form multiple second cavities, and at least two second cavities are arranged on opposite sides of the pressure relief hole along the second direction.

[0029] By adopting the above technical solution, multiple gas adsorption components can respectively adsorb gas on the opposite sides of the end cover assembly along the second direction, further improving the gas adsorption efficiency, further improving the situation of excessive internal pressure of the battery cell, and thus further improving the safety performance of the battery cell.

[0030] In some embodiments of the present application, there are multiple covers, and the multiple covers and the end cover assembly are combined to form multiple second cavities, at least one second cavity is arranged opposite to the pressure relief hole along the first direction, and at least two other second cavities are arranged on opposite sides of the pressure relief hole along the second direction, wherein the first direction is parallel to the thickness direction of the end cover assembly, and the second direction is perpendicular to the thickness direction of the end cover assembly.

[0031] By adopting the above technical solution, multiple gas adsorption components can respectively adsorb gas in the middle of the end cover assembly and on the opposite sides of the end cover assembly along the second direction, thereby further improving the gas adsorption efficiency, further improving the situation where the internal pressure of the battery cell is too high, and thus further improving the safety performance of the battery cell.

[0032] In some embodiments of the present application, a boss for abutting against the electrode assembly is protruded from one side of the end cap assembly facing the electrode assembly, and the sealing cover is connected to the boss and enclosed with the boss to form a second cavity.

[0033] By adopting the above technical solution, it is convenient to assemble the sealing cover and the gas adsorption component.

[0034] In some embodiments of the present application, a surface of the boss close to the electrode assembly is flush with a surface of the cover close to the electrode assembly.

[0035] By adopting the above technical solution, the protruding space of the boss can be effectively utilized, thereby effectively improving the volume energy density of the battery cell.

[0036] In some embodiments of the present application, the sealing cover is provided with an air hole, and the air hole is used to connect the first cavity and the second cavity.

[0037] By adopting the above technical solution, the gas can enter the second cavity through the pores and be absorbed by the gas adsorption member, which effectively improves the situation where the internal pressure of the battery cell is too high, thereby effectively improving the safety performance of the battery cell.

[0038] In some embodiments of the present application, the gas adsorption component includes a gas adsorption medium and a gas permeable packaging member, and the gas permeable packaging member is used to wrap the gas adsorption medium.

[0039] By adopting the above technical solution, the gas can pass through the breathable packaging component to contact the gas adsorption medium and be adsorbed by the gas adsorption medium, which effectively improves the situation where the internal pressure of the battery cell is too high, thereby effectively improving the safety performance of the battery cell.

[0040] An embodiment of the present application also provides a battery, comprising the battery cell described in any of the above embodiments.

[0041] The beneficial effect of the battery provided by the embodiments of the present application is that the battery provided by the embodiments of the present application effectively improves the safety performance of the battery because the battery cell described in any of the above embodiments is adopted.

[0042] An embodiment of the present application also provides an electrical device, comprising the above-mentioned battery.

[0043] The beneficial effect of the electric device provided by the embodiment of the present application is that the electric device provided by the embodiment of the present application effectively improves the safety performance of the electric device because it adopts the above-mentioned battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or exemplary technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0046] Figure 2 for Figure 1 A schematic diagram of an exploded structure of a battery in a vehicle shown;

[0047] Figure 3 for Figure 2 A schematic diagram of the structure of a battery cell in the battery shown;

[0048] Figure 4 for Figure 3 A schematic diagram of the exploded structure of a battery cell in the battery shown;

[0049] Figure 5 A schematic diagram of the exploded structure of the end cap assembly, the sealing cap and the gas adsorption member in the battery cell provided in the embodiment of the present application;

[0050] Figure 6 for Figure 3 A schematic diagram of the top view of the structure of a battery cell in the battery shown;

[0051] Figure 7 for Figure 6 The schematic cross-sectional structure diagram of the battery cell shown along the AA line;

[0052] Figure 8 for Figure 7 The enlarged structural schematic diagram of the battery cell at B is shown.

[0053] Description of reference numerals:

[0054] 1000. Vehicles;

[0055] 100, battery; 10, housing; 11, first part; 12, second part; 20, battery cell; 21, electrode assembly; 22, housing; 23, end cap assembly; 231, cover; 2311, pressure relief hole; 232, insulating member; 2321, through hole; 2322, clip hole; 2323, insulating body 2323; 2324, boss; 24, first cavity; 25, cover; 251, air hole; 252, clip part; 26, second cavity; 27, gas adsorption member; 28, electrode terminal;

[0056] 200, controller;

[0057] 300. Motor. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0059] It should be noted that when a component is referred to as being "fixed on" or "disposed on" another component, it may be directly on the other component or indirectly on the other component. When a component is referred to as being "connected to" another component, it may be directly or indirectly connected to the other component. The orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of description, and does 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 the present application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "first" and "second" are only used for the purpose of convenience of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features. The meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0060] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of the various components in the embodiments of the present application shown in the drawings are only exemplary and should not constitute any limitation to the present application.

[0061] A battery cell is the smallest electrical energy storage unit. The battery cell may include a shell, an end cap assembly and an electrode assembly. The end cap assembly is covered on the shell and enclosed with the shell to form a cavity for accommodating the electrode assembly.

[0062] In the related art, during the charging and discharging process of the battery cell, the electrode assembly will generate gas, such as carbon dioxide gas, etc. As the gas continues to accumulate, the internal pressure of the battery cell will continue to increase. When the internal pressure of the battery cell reaches a critical value, the battery cell will explode due to excessive internal pressure. In order to reduce the risk of explosion of the battery cell, the battery cell is usually provided with a pressure relief mechanism. When the internal pressure of the battery cell reaches a critical value, the pressure relief mechanism opens to connect the internal environment of the battery cell with the external environment, and the gas is discharged into the external environment of the battery cell to reduce the internal pressure of the battery cell. However, when the pressure relief mechanism is opened, the active material in the electrode assembly will be sprayed into the external environment of the battery cell with the gas, and the active material will produce a combustion reaction when it comes into contact with the air, which is not conducive to improving the safety performance of the battery cell.

[0063] In order to improve the safety performance of the battery cell, the end cover assembly in the battery cell provided in the embodiment of the present application is combined with the shell to form a first cavity and with the cover to form a second cavity, and the second cavity is connected to the first cavity. By placing the electrode assembly in the first cavity and the gas adsorption component in the second cavity, the gas generated by the electrode assembly can enter the second cavity through the first cavity, and the gas adsorption component can adsorb the gas, thereby effectively improving the situation where the internal pressure of the battery cell is too high, and effectively improving the safety performance of the battery cell.

[0064] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical equipment using batteries. Among them, electrical equipment may be, but is not limited to, vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and electric tools. Vehicles may be, but are not limited to, fuel vehicles, gas vehicles, and new energy vehicles, and new energy vehicles may be, but are not limited to, pure electric vehicles, hybrid vehicles, and extended-range vehicles. Spacecraft may be, but are not limited to, airplanes, rockets, space shuttles, and spacecraft. Electric toys may be, but are not limited to, fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Electric tools may be, but are not limited to, metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0065] See also Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided in an embodiment of the present application. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000, for example, the battery 100 can be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating, and driving the vehicle 1000.

[0066] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0067] See also Figure 2 , Figure 2Schematic diagram of an explosion of a battery 100 provided in an embodiment of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, and the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure, and the first part 11 is covered on the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 is covered on the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0068] In some embodiments, the box 10 can be used as a part of the chassis structure of the vehicle 1000. For example, part of the box 10 can become at least a part of the floor of the vehicle 1000, or part of the box 10 can become at least a part of the cross beam and longitudinal beam of the vehicle 1000.

[0069] In the battery 100, when there are multiple battery cells 20, the multiple battery cells 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 10. The battery 100 can also include other structures, for example, the battery 100 can also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0070] Each battery cell 20 may be a secondary battery or a primary battery, wherein a secondary battery refers to a battery cell 20 that can be used continuously by activating the active material by charging after the battery cell 20 is discharged, and a primary battery refers to a battery cell 20 that cannot be used continuously by activating the active material by charging after the power of the battery cell 20 is exhausted; the battery cell 20 may be, but is not limited to, a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-hydrogen battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc. The battery cell 20 may also be, but is not limited to, a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or a battery cell 20 of other shapes, wherein the prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a multi-prismatic battery cell, wherein the multi-prismatic battery cell is, for example, a hexagonal battery cell, etc., and the present application has no particular limitation.

[0071] The battery cell 20 provided in the embodiment of the present application is described below with reference to the accompanying drawings.

[0072] First, please also refer to Figures 3 to 7 The embodiment of the present application provides a battery cell 20, including an electrode assembly 21, a shell 22, an end cap assembly 23, a cover 25 and a gas adsorption member 27. The end cap assembly 23 is covered on the shell 22 and encloses with the shell 22 to form a first cavity 24 for accommodating the electrode assembly 21. The cover 25 is connected to the end cap assembly 23 and encloses with the end cap assembly 23 to form a second cavity 26, and the second cavity 26 is connected to the first cavity 24. The gas adsorption member 27 is accommodated in the second cavity 26.

[0073] The electrode assembly 21 is a component in the battery cell 20 where an electrochemical reaction occurs. The battery cell 20 may include one or more electrode assemblies 21. The main body of the electrode assembly 21 is made of a positive electrode sheet, a negative electrode sheet and a separator using a winding process or a stacking process. A plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and a plurality of positive electrode sheets and a plurality of negative electrode sheets are alternately stacked, and a separator is provided between adjacent positive electrode sheets and negative electrode sheets to insulate and separate the positive electrode sheets and the negative electrode sheets. In some embodiments, a plurality of positive electrode sheets may be provided, and the negative electrode sheets are folded to form a plurality of stacked folding sections, and a positive electrode sheet is clamped between adjacent folding sections. In other embodiments, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folding sections. In some embodiments, a plurality of separators may be provided, and they are respectively provided between any adjacent positive electrode sheets or negative electrode sheets. In other embodiments, the separator may be provided continuously and provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding. The shape of the electrode assembly 21 may be, but is not limited to, cylindrical, flat, and multi-prism-shaped. In some embodiments, the electrode assembly 21 may further include pole ears, which include positive pole ears and negative pole ears. The positive pole ears are connected to the positive electrode sheet, and the negative pole ears are connected to the negative electrode sheet to extract the current of the electrode assembly 21 or input the current into the electrode assembly 21.

[0074] In some embodiments, the battery cell 20 may further include an electrolyte, which plays a role in conducting ions between the positive electrode and the negative electrode. In some embodiments, the electrolyte may be a liquid electrolyte. Of course, in other embodiments, the electrolyte may also be a gel electrolyte, a solid electrolyte, etc.

[0075] In some embodiments, the battery cell 20 may further include an electrode terminal 28, which is a component electrically connected to the electrode assembly 21 for outputting or inputting electrical energy. The electrode terminal 28 may be disposed on the end cap assembly 23, a portion of the electrode terminal 28 is disposed in the internal environment of the battery cell 20 and is directly or indirectly connected to the pole ear of the electrode assembly 21, and another portion of the electrode terminal 28 is disposed in the external environment of the battery cell 20 and is connected to components such as a converging component and a sampling device. The number of electrode terminals 28 may be two, and the two electrode terminals 28 are disposed on opposite sides of the end cap assembly 23, one electrode terminal 28 is connected to the positive pole ear, and the other electrode terminal 28 is connected to the negative pole ear. Optionally, the electrode terminal 28 may be a columnar structure, such as a cylindrical structure, a prismatic structure, etc., or a plate-like structure, such as a round plate, a square plate, etc. Of course, in other embodiments, the electrode terminal 28 may also be other irregular three-dimensional structures. The electrode terminal 28 may be made of one metal material or multiple metal materials. The metal material may be, but is not limited to, copper, aluminum, nickel, zinc, iron, etc.

[0076] The shell 22 is a component for providing an internal environment of the battery cell 20, which can be used to accommodate the electrode assembly 21, electrolyte and other components. In some embodiments, the shell 22 may include a peripheral wall and a bottom wall, and the peripheral wall is arranged around the bottom wall and connected to the periphery of the bottom wall to define the internal environment of the shell 22. An opening is formed at one end of the peripheral wall away from the bottom wall, and the electrode assembly 21, electrolyte and other components can enter the internal environment of the shell 22 through the opening. In some embodiments, the shell 22 can be formed in one piece, for example, the shell 22 is formed in one piece by a stretching process. In other embodiments, the various parts of the shell 22 can be formed separately and then connected into a whole, for example, the peripheral wall of the shell 22 and the bottom wall of the shell 22 are formed separately and then welded to each other to form a whole. The shape of the shell 22 can be, but not limited to, a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. The material of the shell 22 can be, but not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0077] The end cap assembly 23 is covered on the opening of the shell 22 to close the internal environment of the shell 22, thereby forming a first cavity 24, in which the electrode assembly 21, electrolyte and other components are accommodated. The end cap assembly 23 may include a cover 231 and an insulating member 232. The cover 231 is covered on the opening of the shell 22. The cover 231 may be provided with an electrode lead-out hole, and the electrode terminal 28 is arranged in the electrode lead-out hole. The insulating member 232 is arranged on the side of the cover 231 facing the electrode assembly 21 to insulate and separate the electrode assembly 21 from the cover 231. Specifically, the shell 22 and the cover 231 may form a common connection surface before other components are put into the shell. When it is necessary to encapsulate the interior of the shell 22, the cover 231 is covered on the opening of the shell 22. The shape of the cover 231 may be adapted to the shape of the shell 22 to match the shell 22. The cover 231 can be made of a material with a certain hardness and strength, so that the cover 231 is not easily deformed when squeezed or collided, so that the battery cell 20 can have a higher structural strength and the safety performance can also be improved. The material of the cover 231 can be, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0078] In some embodiments, the battery cell 20 may further include a pressure relief mechanism, which is a mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold value. In some embodiments, the pressure relief mechanism is mounted on the cover 231, and a pressure relief hole 2311 may be opened on the cover 231, the pressure relief hole 2311 is connected to the first cavity 24, and when there are two electrode terminals 28, the pressure relief hole 2311 may be opened between the two electrode terminals 28, and the pressure relief mechanism is installed in the pressure relief hole 2311. In other embodiments, the pressure relief mechanism is mounted on the housing 22, for example, the pressure relief mechanism may be mounted on the bottom wall of the housing 22.

[0079] The cover 25 is used to cooperate with the end cover assembly 23 to form a second cavity 26. The second cavity 26 is connected to the first cavity 24. A connecting structure for connecting the second cavity 26 with the first cavity 24 can be provided on the cover 25, and a connecting structure for connecting the second cavity 26 with the first cavity 24 can also be provided on the end cover assembly 23. In some embodiments, the cover 25 can be connected to the insulating member 232 and enclosed to form the second cavity 26. The connection method between the cover 25 and the insulating member 232 can be, but not limited to, snap connection, fastening connection, hot melting, bonding, etc. In other embodiments, the cover 25 can be connected to the cover body 231 and enclosed to form the second cavity 26. The connection method between the cover 25 and the cover body 231 can be, but not limited to, snap connection, fastening connection, welding, bonding, etc.

[0080] The gas adsorption component 27 is a component for absorbing gas. The gas adsorption component 27 is accommodated in the second cavity 26, and the second cavity 26 can accommodate one or more gas adsorption components 27. The gas adsorption component 27 may include a gas adsorption medium and a breathable package, and the breathable package is used to wrap the gas adsorption medium. Among them, the gas adsorption medium is the main functional component of the gas adsorption component 27, which is used to adsorb gas. In some embodiments, the gas adsorption medium can be a chemical adsorption medium, that is, the gas adsorption medium can react chemically with the gas to convert the gas into a solid substance and / or a liquid substance, and confine the solid substance and / or the liquid substance in the breathable package. For example, the gas adsorption medium can be a mixture of alkaline oxides and hydroxides. As an example, the gas adsorption medium can be a mixture of lithium oxides (such as Li2O) and lithium hydroxides (such as LiOH). The gas adsorption medium can react with carbon dioxide gas (CO2) as follows:

[0081] Li2O+CO2=Li2CO3 (Reaction 1);

[0082] 2LiOH+CO2=Li2CO3+H2O (Reaction 2);

[0083] Li2O+H2O=2LiOH (Reaction 3);

[0084] In the above reaction, water (H2O) can play a catalytic role. The LiOH generated by reaction 3 can continue to react with CO2, and the generated H2O is captured by LiOH, thus forming a closed cycle of consuming CO2 and improving the adsorption efficiency of the gas adsorption component 27.

[0085] Of course, in other embodiments, the gas adsorption medium may also be a physical adsorption medium, such as molecular sieve, graphene, activated carbon, etc.

[0086] The permeable package is a component used to constrain the gas adsorption medium. It can be understood that the permeable package has good permeability, and the gas can pass through the permeable package, while liquids and solids are difficult to pass through the permeable package or cannot pass through the permeable package at all. Taking carbon dioxide as an example, the carbon dioxide permeability of the permeable package is greater than 100cm 3 (cubic centimeters)×25μm / m 2 (micrometers / square meter)×24h(hours)×0.1Mpa(megapascals), that is, under 1 standard atmospheric pressure (0.1Mpa), within 24 hours, the carbon dioxide permeability of a breathable package with an area of ​​1 square meter and a thickness of 25μm is greater than 100cm 3 The material of the breathable packaging member may be, but is not limited to, polypropylene, polyethylene, polyethylene terephthalate, polytetrafluoroethylene, polyvinylidene fluoride, and the like.

[0087] The end cap assembly 23 in the battery cell 20 provided in the embodiment of the present application is combined with the shell 22 to form a first cavity 24 and is combined with the cover 25 to form a second cavity 26. The second cavity 26 is connected to the first cavity 24. By placing the electrode assembly 21 in the first cavity 24 and placing the gas adsorption component 27 in the second cavity 26, the gas generated by the electrode assembly 21 can enter the second cavity 26 via the first cavity 24, and the gas adsorption component 27 can adsorb the gas, thereby effectively improving the situation where the internal pressure of the battery cell 20 is too high, and effectively improving the safety performance of the battery cell 20.

[0088] In addition, by setting the gas adsorption component 27 on the end cover assembly 23, it is convenient to assemble the gas adsorption component 27, and a distance is usually reserved between the end cover assembly 23 and the electrode assembly 21, so that the space between the end cover assembly 23 and the electrode assembly 21 can be fully utilized, thereby effectively improving the volume energy density of the battery cell 20.

[0089] In some embodiments of the present application, the cover 25 is detachably connected to the end cover assembly 23 .

[0090] It should be noted that the detachable connection between the cover 25 and the end cover assembly 23 refers to a connection method that allows the cover 25 and the end cover assembly 23 to be disassembled and assembled without damaging the cover 25, the end cover assembly 23, and the connecting parts used to connect the cover 25 and the end cover assembly 23. The detachable connection method may be, but is not limited to, a snap connection method, a threaded connection method, a latch connection method, and the like.

[0091] By adopting the above technical solution, the gas adsorption component 27 is easily assembled, and the assembly efficiency of the battery cell 20 is effectively improved.

[0092] In some embodiments of this application, please refer to Figure 7 and Figure 8 The battery cell 20 also includes a snap-fit ​​structure, and the cover 25 is connected to the end cover assembly 23 via the snap-fit ​​structure.

[0093] In other words, the sealing cover 25 and the end cover assembly 23 are connected by a snap-fit ​​connection.

[0094] By adopting the above technical solution, it is easier to assemble the gas adsorption component 27 , and the assembly efficiency of the battery cell 20 is further improved.

[0095] In some embodiments of this application, please refer to Figure 7 and Figure 8 The snap-fit ​​structure includes a snap-fitting portion 2322 and a snap-fitting portion 252. The snap-fitting portion 2322 is arranged in one of the end cover assembly 23 and the cover 25, and the snap-fitting portion 252 is arranged in the other of the end cover assembly 23 and the cover 25. The snap-fitting portion 252 is snap-fitted in the snap-fitting portion 2322.

[0096] In some embodiments, the latch hole portion 2322 is provided on the end cover assembly 23 , for example, the latch hole portion 2322 is provided on the insulating member 232 , and the buckle portion 252 is disposed on the sealing cover 25 .

[0097] In other embodiments, the latch hole 2322 is opened on the sealing cover 25 , and the buckle portion 252 is disposed on the end cover assembly 23 , for example, the buckle portion 252 is disposed on the insulating member 232 .

[0098] The clamping hole 2322 may be a through hole 2321. For example, when the clamping hole 2322 is provided in the insulating member 232, the clamping hole 2322 penetrates the insulating member 232, and the clamp head of the buckle portion 252 may pass through the clamping hole 2322 and be clamped on the edge of the port of the clamping hole 2322. The clamping hole 2322 may also be a blind hole, and the clamp head of the clamping hole 2322 may be inserted into the clamping hole 2322 and be clamped on the hole wall of the clamping hole 2322. The number of the clamping holes 2322 and the number of the buckle portions 252 may be multiple, and the multiple clamping holes 2322 and the multiple buckle portions 252 are arranged in a one-to-one correspondence.

[0099] In some embodiments, in order to facilitate the insertion of the buckle portion 252 into the hole portion 2322, a chamfered surface can be set on the buckle head of the buckle portion 252 so that the buckle portion 252 can be inserted into the hole portion 2322 along the chamfered surface in the direction from the buckle portion 252 to the hole portion 2322.

[0100] By adopting the above technical solution, it is easier to assemble the gas adsorption component 27 , and the assembly efficiency of the battery cell 20 is further improved.

[0101] In some embodiments of this application, please refer to Figure 5At least a portion of the second cavity 26 is arranged opposite to the pressure relief hole 2311 along a first direction, and the first direction is parallel to the thickness direction of the end cover assembly 23 .

[0102] It should be noted that the battery cell 20 has a height direction, a length direction and a width direction. Figures 3 to 5 In some embodiments, the height direction of the battery cell 20 may be the lead-out direction of the electrode terminal 28. Figures 3 to 5 The X direction shown in FIG. 1 is the length direction of the battery cell 20. Figures 3 to 5 The Y direction shown. The size of the battery cell 20 along the width direction may be the same as or different from the size of the battery cell 20 along the length direction. The shell 22 and the end cap assembly 23 cooperate to define the shape of the battery cell 20. When the electrode terminal 28 is disposed on the end cap assembly 23, the height direction of the battery cell 20 is the thickness direction of the end cap assembly 23, the width direction of the battery cell 20 is the width direction of the end cap assembly 23, and the length direction of the battery cell 20 is the length direction of the end cap assembly 23. In other words, the first direction is parallel to the height direction of the battery cell 20.

[0103] At least part of the second cavity 26 is arranged opposite to the pressure relief hole 2311 along the first direction, which means that: taking any plane perpendicular to the first direction as a reference plane, at least part of the projection of the second cavity 26 on the reference plane coincides with the projection of the pressure relief hole 2311 on the reference plane. In some embodiments, the projection of the second cavity 26 on the reference plane may completely coincide with the projection of the pressure relief hole 2311 on the reference plane, for example, the projection of the second cavity 26 on the reference plane is entirely within the projection range of the pressure relief hole 2311 on the reference plane, and for another example, the projection of the pressure relief hole 2311 on the reference plane is entirely within the projection range of the second cavity 26 on the reference plane.

[0104] By adopting the above technical solution, it is easy for the gas adsorption member 27 to adsorb gas, improve the gas adsorption efficiency, further improve the situation that the internal pressure of the battery cell 20 is too high, and thus further improve the safety performance of the battery cell 20.

[0105] In some embodiments of this application, please refer to Figure 5 The cover body 231 is provided with a pressure relief hole 2311 , the cover 25 is connected to the insulating member 232 and is enclosed with the insulating member 232 to form a second cavity 26 , the insulating member 232 is provided with a through hole 2321 , and the through hole 2321 is used to connect the second cavity 26 and the pressure relief hole 2311 .

[0106] In some embodiments, the through hole 2321 can penetrate the insulating member 232 along the above-mentioned first direction. In the first direction, at least a portion of the through hole 2321 is arranged opposite to the second cavity 26 and the pressure relief hole 2311, that is, at least a portion of the projection of the through hole 2321 on the above-mentioned reference plane coincides with the projection of the second cavity 26 on the above-mentioned reference plane and the projection of the pressure relief hole 2311 on the above-mentioned reference plane, so that the second cavity 26, the through hole 2321 and the pressure relief hole 2311 can be connected along the first direction to form a pressure relief channel.

[0107] By adopting the above-mentioned technical solution, when the internal pressure of the battery cell 20 is too high, the gas can be discharged to the external environment of the battery cell 20 through the second cavity 26, the through hole 2321 and the pressure relief hole 2311 in sequence, so that the battery cell 20 has good pressure relief efficiency, effectively reducing the risk of explosion of the battery cell 20, thereby further improving the safety performance of the battery cell 20.

[0108] In some embodiments of this application, please refer to Figure 5 At least a portion of the through hole 2321 protrudes from the side of the sealing cover 25 toward the outside of the second cavity 26 to connect the first cavity 24 and the pressure relief hole 2311.

[0109] In some embodiments, the through hole 2321 may include a main body region and a branch region, wherein in the first direction, the second cavity 26 and the pressure relief hole 2311 are arranged opposite to the main body region, so that the main body region is connected to the second cavity 26 and the pressure relief hole 2311, and the branch region is arranged on one side of the main body region and protrudes from the side of the cover 25 toward the outside of the second cavity 26, so that the branch region is connected to the first cavity 24 and the pressure relief hole 2311. As an example, in order to increase the pressure relief area of ​​the battery cell 20, the number of branch regions may be at least two, and at least two branch regions are divided into two parts and are arranged on opposite sides of the main body region, one part of the branch region protrudes from one side of the cover 25 toward the outside of the second cavity 26, and the other part of the branch region protrudes from the other side of the cover 25 toward the outside of the second cavity 26.

[0110] By adopting the above-mentioned technical scheme, when the internal pressure of the battery cell 20 is too high, the gas can not only be discharged to the external environment of the battery cell 20 through the second cavity 26, the through hole 2321 and the pressure relief hole 2311 in sequence, but also be discharged to the external environment of the battery cell 20 through the first cavity 24, the through hole 2321 and the pressure relief hole 2311 in sequence, thereby effectively increasing the pressure relief area of ​​the battery cell 20, improving the pressure relief efficiency of the battery cell 20, and effectively reducing the risk of explosion of the battery cell 20, thereby further improving the safety performance of the battery cell 20.

[0111] In some embodiments of this application, please refer to Figure 5The second cavity 26 is disposed on one side of the pressure relief hole 2311 along a second direction, and the second direction is perpendicular to the thickness direction of the end cover assembly 23 .

[0112] It should be noted that the second direction can be the width direction of the end cover assembly 23, or the length direction of the end cover assembly 23. In some embodiments, when the dimension of the end cover assembly 23 along the length direction is greater than the dimension of the end cover assembly 23 along the width direction, the second direction can be the length direction of the end cover assembly 23, that is, the second cavity 26 is arranged on one side of the end cover assembly 23 along the length direction, and the pressure relief hole 2311 can be opened in the middle part of the end cover assembly 23 along the length direction.

[0113] In some embodiments, when the end cover assembly 23 includes a cover body 231 and an insulating member 232, the cover body 231 is provided with a pressure relief hole 2311, and the pressure relief hole 2311 is located in the middle of the cover body 231 along the second direction. The cover 25 is connected to one side of the insulating member 232 along the second direction and is enclosed with the insulating member 232 to form a second cavity 26.

[0114] By adopting the above technical solution, it is easy for the gas adsorption member 27 to adsorb gas, improve the gas adsorption efficiency, further improve the situation that the internal pressure of the battery cell 20 is too high, and thus further improve the safety performance of the battery cell 20.

[0115] In some embodiments of this application, please refer to Figure 5 There are multiple covers 25 , and the multiple covers 25 and the end cover assembly 23 are combined to form multiple second cavities 26 , and at least two second cavities 26 are arranged on opposite sides of the pressure relief hole 2311 along the second direction.

[0116] In some embodiments, there are two covers 25, and the two covers 25 are respectively connected to the opposite sides of the end cover assembly 23 along the second direction. For example, when the end cover assembly 23 includes a cover body 231 and an insulating member 232, the pressure relief hole 2311 is opened in the middle of the cover body 231 along the second direction, and the two covers 25 are respectively connected to the opposite sides of the insulating member 232 along the second direction and are enclosed with the insulating member 232 to form two second cavities 26, and each second cavity 26 accommodates at least one gas adsorption component 27.

[0117] By adopting the above technical solution, multiple gas adsorption components 27 can respectively adsorb gas on the opposite sides of the end cover assembly 23 along the second direction, further improving the gas adsorption efficiency, further improving the situation of excessive internal pressure of the battery cell 20, and thus further improving the safety performance of the battery cell 20.

[0118] In some embodiments of this application, please refer to Figure 5There are multiple covers 25, and the multiple covers 25 and the end cover assembly 23 are combined to form multiple second cavities 26. At least one second cavity 26 is arranged opposite to the pressure relief hole 2311 along the first direction, and at least another two second cavities 26 are arranged on opposite sides of the pressure relief hole 2311 along the second direction, wherein the first direction is parallel to the thickness direction of the end cover assembly 23, and the second direction is perpendicular to the thickness direction of the end cover assembly 23.

[0119] In some embodiments, when the end cover assembly 23 includes a cover body 231 and an insulating member 232, the pressure relief hole 2311 is opened in the middle of the cover body 231 along the second direction, and the number of the covers 25 is three, one of which is connected to the middle of the insulating member 232 along the second direction and is enclosed with the insulating member 232 to form a second cavity 26, so that the second cavity 26 is arranged opposite to the pressure relief hole 2311 along the first direction, and the other two covers 25 are respectively connected to the opposite sides of the insulating member 232 along the second direction and are enclosed with the insulating member 232 to form two second cavities 26, and each second cavity 26 accommodates at least one gas adsorption member 27.

[0120] By adopting the above technical solution, multiple gas adsorption components 27 can respectively adsorb gas in the middle of the end cover assembly 23 and on the opposite sides of the end cover assembly 23 along the second direction, thereby further improving the gas adsorption efficiency, further improving the situation where the internal pressure of the battery cell 20 is too high, and thus further improving the safety performance of the battery cell 20.

[0121] In some embodiments of this application, please refer to Figure 5 A boss 2324 for abutting against the electrode assembly 21 is provided on one side of the end cap assembly 23 facing the electrode assembly 21 , and the cover 25 is connected to the boss 2324 and encloses the boss 2324 to form a second cavity 26 .

[0122] The boss 2324 is used to abut against the electrode assembly 21 so that at least a portion of the end cap assembly 23 is spaced apart from the electrode assembly 21 to form a gap space. In some embodiments, the end cap assembly 23 includes a cover 231 and an insulating member 232, the cover 231 covers the opening of the shell 22, and the insulating member 232 is disposed on the side of the cover 231 facing the electrode assembly 21. The insulating member 232 includes an insulating body 2323 and the boss 2324, the boss 2324 is convexly disposed on the side of the insulating body 2323 facing the electrode assembly 21, the boss 2324 and the insulating body 2323 can be integrally formed components, for example, the boss 2324 and the insulating body 2323 can be integrally formed by injection molding, or the boss 2324 and the insulating body 2323 can be separately formed and then connected to each other to form a whole.

[0123] In some embodiments, a groove is formed on one side of the boss 2324 facing the electrode assembly 21, and a cover 25 is provided on the side of the boss 2324 facing the electrode assembly 21 to seal the inner space of the groove to form the second cavity 26. The number of bosses 2324 may be one or more, and it can be understood that the number of covers 25 corresponds to the number of bosses 2324.

[0124] In some embodiments, the boss 2324 is arranged opposite to the pressure relief hole 2311 along the first direction, and the cover 25 is connected to the boss 2324 and encloses the boss 2324 to form a second cavity 26, so that the second cavity 26 is arranged opposite to the pressure relief hole 2311 along the first direction.

[0125] In other embodiments, the number of the bosses 2324 is two, and correspondingly, the number of the covers 25 is two, the two bosses 2324 are arranged on opposite sides of the insulating body 2323 along the second direction, and the two covers 25 are connected to the two bosses 2324 in a one-to-one correspondence and enclose to form a second cavity 26, and each second cavity 26 accommodates at least one gas adsorption component 27.

[0126] In some other embodiments, the number of the bosses 2324 is three, and correspondingly, the number of the covers 25 is three, wherein one of the bosses 2324 is arranged opposite to the pressure relief hole 2311 along the first direction, and the other two bosses 2324 are arranged on opposite sides of the insulating body 2323 along the second direction. The three covers 25 are connected to the three bosses 2324 in a one-to-one correspondence and enclose to form a second cavity 26, and each second cavity 26 accommodates at least one gas adsorption component 27.

[0127] By adopting the above technical solution, the assembly operation of the cover 25 and the gas adsorbing member 27 is facilitated.

[0128] In some embodiments of the present application, the surface of the boss 2324 close to the electrode assembly 21 is flush with the surface of the cover 25 close to the electrode assembly 21 .

[0129] In other words, the surface of the boss 2324 close to the electrode assembly 21 and the surface of the cover 25 close to the electrode assembly 21 are on the same plane.

[0130] By adopting the above technical solution, the protruding space of the boss 2324 can be effectively utilized, thereby effectively improving the volume energy density of the battery cell 20.

[0131] In some embodiments of this application, please refer to Figure 5 The cover 25 is provided with an air hole 251 , and the air hole 251 is used to connect the first cavity 24 and the second cavity 26 .

[0132] The air hole 251 is used to connect the first cavity 24 and the second cavity 26, that is, the gas can enter the second cavity 26 from the first cavity 24 through the air hole 251. The number of the air hole 251 can be one or more. The shape of the air hole 251 can be, but is not limited to, circular, square, oval, etc.

[0133] In some embodiments, the cover 25 is connected to the side of the end cover assembly 23 facing the electrode assembly 21 and is enclosed with the end cover assembly 23 to form a second cavity 26. For example, when the end cover assembly 23 includes a cover body 231 and an insulating member 232, the cover 25 is connected to the side of the insulating member 232 facing the electrode assembly 21 and is enclosed with the insulating member 232 to form a second cavity 26. The air hole 251 can be opened on the surface of the cover 25 facing the electrode assembly 21, and can also be opened on the peripheral side of the cover 25.

[0134] By adopting the above technical solution, the gas can enter the second cavity 26 through the air hole 251 and be absorbed by the gas adsorption member 27, which effectively improves the situation where the internal pressure of the battery cell 20 is too high, thereby effectively improving the safety performance of the battery cell 20.

[0135] In some embodiments of this application, please refer to Figures 3 to 8 The battery cell 20 includes an electrode assembly 21, a shell 22, an end cap assembly 23, a sealing cap 25, a gas adsorption member 27, a pressure relief mechanism and an electrode terminal 28. The end cap assembly 23 includes a cover 231 and an insulating member 232. The cover 231 covers the opening of the shell 22 and is enclosed with the shell 22 to form a first cavity 24 for accommodating the electrode assembly 21. The insulating member 232 is arranged on the side of the cover 231 facing the electrode assembly 21 to insulate and separate the electrode assembly 21 from the cover 231. The cover 231 is provided with a pressure relief hole 2311 and an electrode lead-out hole. The pressure relief hole 2311 is connected to the first cavity 24. The pressure relief mechanism is installed in the pressure relief hole 2311, and the electrode terminal 28 is installed in the electrode lead-out hole. The insulating member 232 includes an insulating body 2323 and a boss 2324. The boss 2324 is convexly arranged on the side of the insulating body 2323 facing the electrode assembly 21. One of the boss 2324 and the cover 25 is provided with a clamping hole 2322. The other of the boss 2324 and the cover 25 is provided with a buckle 252. The buckle 252 is clamped in the buckle 2322, so that the cover 25 is connected with the boss 2324 and encloses to form a second cavity 26. The number of bosses 2324 and the number of covers 25 are both three, one of which is located in the middle of the insulating body 2323 along the second direction and is arranged opposite to the pressure relief hole 2311, and the other two bosses 2324 are arranged on opposite sides of the insulating body 2323 along the second direction. The three covers 25 are connected with the three bosses 2324 in a one-to-one correspondence and enclose to form three second cavities 26, and each second cavity 26 contains at least one gas adsorption member 27.

[0136] Second, see Figure 2 , an embodiment of the present application provides a battery 100, comprising the battery cell 20 described in any of the above embodiments.

[0137] The battery 100 provided in the embodiment of the present application adopts the battery cell 20 described in any of the above embodiments, thereby effectively improving the safety performance of the battery 100.

[0138] Third, see Figure 1 , an embodiment of the present application provides an electrical device, including the above-mentioned battery 100.

[0139] The electric device provided in the embodiment of the present application adopts the above-mentioned battery 100, thereby effectively improving the safety performance of the electric device.

[0140] The above are only optional embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A battery cell, characterized in that: The battery cell comprises: Electrode assembly; case; An end cap assembly, which is disposed on the shell and is enclosed with the shell to form a first cavity for accommodating the electrode assembly; A sealing cover connected to the end cover assembly and enclosed with the end cover assembly to form a second cavity, wherein the second cavity is communicated with the first cavity; The gas adsorption component is accommodated in the second chamber.

2. The battery cell according to claim 1, characterized in that: The sealing cover is detachably connected to the end cover assembly.

3. The battery cell according to claim 2, characterized in that: The battery cell further comprises a buckle structure, and the sealing cover is connected to the end cover assembly via the buckle structure.

4. The battery cell according to claim 3, characterized in that: The buckle structure includes a buckle hole portion and a buckle portion, wherein the buckle hole portion is arranged in one of the end cover assembly and the sealing cover, and the buckle portion is arranged in the other of the end cover assembly and the sealing cover, and the buckle portion is buckled in the buckle hole portion.

5. The battery cell according to claim 1, characterized in that: The end cover assembly is provided with a pressure relief hole, and the pressure relief hole is used to connect the first cavity and the external environment of the battery cell.

6. The battery cell according to claim 5, characterized in that: At least a portion of the second cavity is disposed opposite to the pressure relief hole along a first direction, and the first direction is parallel to a thickness direction of the end cover assembly.

7. The battery cell according to claim 6, characterized in that: The end cap assembly includes a cover body and an insulating member, wherein the cover body is covered on the shell and is provided with the pressure relief hole, the insulating member is arranged on the side of the cover body facing the electrode assembly, the sealing cover is connected to the insulating member and is enclosed with the insulating member to form the second cavity, and the insulating member is provided with a through hole, which is used to connect the second cavity and the pressure relief hole.

8. The battery cell according to claim 7, characterized in that: At least a portion of the through hole protrudes from the side of the cover toward the outside of the second cavity to connect the first cavity and the pressure relief hole.

9. The battery cell according to claim 5, characterized in that: The second cavity is arranged on one side of the pressure relief hole along a second direction, and the second direction is perpendicular to the thickness direction of the end cover assembly.

10. The battery cell according to claim 9, characterized in that: There are multiple sealing covers, and the multiple sealing covers and the end cover assembly are combined to form multiple second cavities, and at least two of the second cavities are arranged on opposite sides of the pressure relief hole along the second direction.

11. The battery cell according to claim 5, characterized in that: There are multiple sealing covers, and the multiple sealing covers and the end cover assembly are combined to form multiple second cavities, at least one of the second cavities is arranged opposite to the pressure relief hole along the first direction, and at least another two of the second cavities are arranged on opposite sides of the pressure relief hole along the second direction, wherein the first direction is parallel to the thickness direction of the end cover assembly, and the second direction is perpendicular to the thickness direction of the end cover assembly.

12. The battery cell according to any one of claims 1 to 11, characterized in that: A boss for abutting against the electrode assembly is protruded from one side of the end cap assembly facing the electrode assembly, and the sealing cover is connected to the boss and encloses the boss to form the second cavity.

13. The battery cell according to claim 12, characterized in that: The surface of the boss close to the electrode assembly is flush with the surface of the cover close to the electrode assembly.

14. The battery cell according to any one of claims 1 to 11, characterized in that: The sealing cover is provided with an air hole, and the air hole is used to connect the first cavity and the second cavity.

15. The battery cell according to any one of claims 1 to 11, characterized in that: The gas adsorption member includes a gas adsorption medium and a gas permeable packaging member, and the gas permeable packaging member is used to wrap the gas adsorption medium.

16. A battery, characterized in that: The battery comprises the battery cell according to any one of claims 1 to 15.

17. An electrical equipment, characterized in that: The electric device comprises the battery as claimed in claim 16.

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