Battery cell, battery, and electric device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2024-07-30
- Publication Date
- 2026-07-10
Smart Images
Figure CN122374905A_ABST
Abstract
Description
Battery cell, battery and electric device
[0001] Cross-reference to related applications
[0002] This application is based on Chinese Patent Application No. 202420735729.2 entitled "Battery cell, battery and electric device" filed on April 10, 2024, which is incorporated by reference in its entirety. TECHNICAL FIELD
[0003] The present application relates to the technical field of battery, in particular to a battery cell, a battery and an electric device. BACKGROUND
[0004] Energy saving and emission reduction is 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 energy-saving and environmentally friendly advantages. For electric vehicles, battery technology is an important factor for their development.
[0005] A battery usually includes a battery cell. In the development process of battery technology, how to improve the safety performance of the battery cell is an urgent technical problem in the battery technology.
[0006] SUMMARY
[0007] One of the purposes of the embodiments of the present application is to provide a battery cell, a battery and an electric device, which aims to solve the technical problem of poor safety performance of the battery cell in the related art.
[0008] To solve the above technical problems, the technical solution adopted by the embodiments of the present application is to provide a battery cell, which includes:
[0009] An electrode assembly;
[0010] A shell;
[0011] An end cover assembly, which is arranged on the shell and forms a first cavity with the shell for accommodating the electrode assembly;
[0012] A cover, which is connected to the end cover assembly and forms a second cavity with the end cover assembly, the second cavity being in communication with the first cavity;
[0013] A gas adsorption member, which is accommodated in the second cavity.
[0014] The battery monomer provided by the embodiments of the present application has the beneficial effects that the end cover assembly and the shell enclose the first cavity, and the end cover assembly and the cover enclose the second cavity, the second cavity is in communication with the first cavity, the electrode assembly is accommodated in the first cavity, and the gas adsorption member is accommodated in the second cavity, the gas generated by the electrode assembly can enter the second cavity through the first cavity, and the gas adsorption member can adsorb the gas, thereby effectively improving the situation that the internal pressure of the battery monomer is too high, and effectively improving the safety performance of the battery monomer.
[0015] In some embodiments of the present application, the cover and the end cover assembly are detachably connected.
[0016] By adopting the above technical solution, the assembly operation of the gas adsorption member is facilitated, and the assembly efficiency of the battery monomer is effectively improved.
[0017] In some embodiments of the present application, the battery monomer further comprises a buckle structure, and the cover and the end cover assembly are connected through the buckle structure.
[0018] By adopting the above technical solution, the assembly operation of the gas adsorption member is more facilitated, and the assembly efficiency of the battery monomer is further improved.
[0019] In some embodiments of the present application, the buckle structure comprises a buckle hole portion and a buckle portion, the buckle hole portion is arranged on one of the end cover assembly and the cover, the buckle portion is arranged on the other one of the end cover assembly and the cover, and the buckle portion is buckled in the buckle hole portion.
[0020] By adopting the above technical solution, the assembly operation of the gas adsorption member is more facilitated, and the assembly efficiency of the battery monomer is further improved.
[0021] 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 for communicating the first cavity and the external environment of the battery monomer.
[0022] By adopting the above technical solution, in the case that the internal pressure of the battery monomer is too high, the gas can be discharged to the external environment of the battery monomer through the pressure relief hole, the risk of explosion of the battery monomer is effectively reduced, and the safety performance of the battery monomer is further improved.
[0023] In some embodiments of the present application, at least part of the second cavity is arranged opposite to the pressure relief hole along a first direction, and the first direction is parallel to the thickness direction of the end cover assembly.
[0024] By adopting the above technical solution, the gas adsorption member can adsorb the gas, the gas adsorption efficiency is improved, the situation that the internal pressure of the battery monomer is too high is further improved, and the safety performance of the battery monomer is further improved.
[0025] In some embodiments of the present application, the end cover assembly comprises a cover body and an insulating piece, the cover body covers the shell and is provided with a pressure relief hole, the insulating piece is arranged on the side of the cover body facing the electrode assembly, a cover is connected to the insulating piece and forms a second cavity with the insulating piece, the insulating piece is provided with a through hole for connecting the second cavity and the pressure relief hole.
[0026] By adopting the above technical solution, in the case that the internal pressure of the battery monomer is too high, the gas can be discharged to the external environment of the battery monomer through the second cavity, the through hole and the pressure relief hole in turn, so that the battery monomer has good pressure relief efficiency, effectively reduces the risk of explosion of the battery monomer, and further improves the safety performance of the battery monomer.
[0027] In some embodiments of the present application, at least part of the through hole protrudes from the side of the cover to the outside of the second cavity to connect the first cavity and the pressure relief hole.
[0028] By adopting the above technical solution, in the case that the internal pressure of the battery monomer is too high, the gas can be discharged to the external environment of the battery monomer through the second cavity, the through hole and the pressure relief hole in turn, so that the battery monomer has good pressure relief efficiency, effectively reduces the risk of explosion of the battery monomer, and further improves the safety performance of the battery monomer.
[0029] In some embodiments of the present application, the second cavity is arranged on one side of the pressure relief hole along the second direction, and the second direction is perpendicular to the thickness direction of the end cover assembly.
[0030] By adopting the above technical solution, the gas adsorption member can adsorb the gas, the gas adsorption efficiency is improved, the case that the internal pressure of the battery monomer is too high is further improved, and the safety performance of the battery monomer is further improved.
[0031] In some embodiments of the present application, the number of covers is multiple, the multiple covers form multiple second cavities with the end cover assembly, and at least two second cavities are arranged on opposite sides of the pressure relief hole along the second direction.
[0032] By adopting the above technical solution, the multiple gas adsorption members can respectively adsorb the gas on opposite sides of the end cover assembly along the second direction, the gas adsorption efficiency is further improved, the case that the internal pressure of the battery monomer is too high is further improved, and the safety performance of the battery monomer is further improved.
[0033] In some embodiments of the present application, the plurality of covers are arranged to enclose a plurality of second cavities with the end cover assembly, at least one of the second cavities is arranged opposite to the pressure relief hole along a first direction, and at least two other second cavities are arranged on opposite sides of the pressure relief hole along a second direction, wherein the first direction is parallel to a thickness direction of the end cover assembly, and the second direction is perpendicular to the thickness direction of the end cover assembly.
[0034] By using the above technical solution, the plurality of gas adsorption members can respectively adsorb gas at the middle of the end cover assembly and on 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 further improving the safety performance of the battery cell.
[0035] In some embodiments of the present application, a protrusion for abutting against the electrode assembly is arranged on a side of the end cover assembly facing the electrode assembly, and the cover is connected to the protrusion and encloses a second cavity with the protrusion.
[0036] By using the above technical solution, the cover and the gas adsorption member can be conveniently assembled.
[0037] In some embodiments of the present application, a surface of the protrusion close to the electrode assembly is flush with a surface of the cover close to the electrode assembly.
[0038] By using the above technical solution, the protruding space of the protrusion can be effectively utilized, thereby effectively improving the volume energy density of the battery cell.
[0039] In some embodiments of the present application, the cover is provided with a gas hole for communicating the first cavity and the second cavity.
[0040] By using the above technical solution, the gas can enter the second cavity through the gas hole and be adsorbed by the gas adsorption member, effectively improving the situation of excessive internal pressure of the battery cell, and effectively improving the safety performance of the battery cell.
[0041] In some embodiments of the present application, the gas adsorption member includes a gas adsorption medium and a gas-permeable packaging member for wrapping the gas adsorption medium.
[0042] By using the above technical solution, the gas can contact the gas adsorption medium through the gas-permeable packaging member and be adsorbed by the gas adsorption medium, effectively improving the situation of excessive internal pressure of the battery cell, and effectively improving the safety performance of the battery cell.
[0043] The embodiments of the present application also provide a battery including the battery cell described in any one of the above embodiments.
[0044] The battery provided by the embodiments of the present application has the beneficial effect that the battery provided by the embodiments of the present application effectively improves the safety performance of the battery due to the use of the battery monomer described in any one of the above embodiments.
[0045] The embodiments of the present application also provide a use electric device including the above battery.
[0046] The use electric device provided by the embodiments of the present application has the beneficial effect that the use electric device provided by the embodiments of the present application effectively improves the safety performance of the use electric device due to the use of the above battery. BRIEF DESCRIPTION OF DRAWINGS
[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or exemplary technical descriptions will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort on the basis of these drawings.
[0048] FIG. 1 is a structural schematic diagram of a vehicle provided by the embodiments of the present application;
[0049] FIG. 2 is an exploded structural schematic diagram of a battery in the vehicle shown in FIG. 1;
[0050] FIG. 3 is a structural schematic diagram of a battery monomer in the battery shown in FIG. 2;
[0051] FIG. 4 is an exploded structural schematic diagram of the battery monomer in the battery shown in FIG. 3;
[0052] FIG. 5 is an exploded structural schematic diagram of an end cover assembly, a cover and a gas adsorption member in the battery monomer provided by the embodiments of the present application;
[0053] FIG. 6 is a top view structural schematic diagram of the battery monomer in the battery shown in FIG. 3;
[0054] FIG. 7 is a sectional view structural schematic diagram of the battery monomer shown in FIG. 6 along the direction of line A-A;
[0055] FIG. 8 is an enlarged structural schematic diagram of B of the battery monomer shown in FIG. 7.
[0056] Explanation of Reference Signs:
[0057] 1000, vehicle;
[0058] 100, battery; 10, case; 11, first part; 12, second part; 20, battery cell; 21, electrode assembly; 22, shell; 23, end cap assembly; 231, cover; 2311, pressure relief hole; 232, insulating piece; 2321, through hole; 2322, clamping hole portion; 2323, insulating body 2323; 2324, boss; 24, first cavity; 25, cover; 251, air hole; 252, clamping portion; 26, second cavity; 27, gas adsorption member; 28, electrode terminal;
[0059] 200, controller;
[0060] 300, motor. DETAILED DESCRIPTION
[0061] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.
[0062] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it can 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 can be directly or indirectly connected to the other component. The terms "upper", "lower", "left", "right", and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances. The terms "first", "second" are only for the purpose of convenient description, and cannot be understood as indicating or implying relative importance or implying the number of technical features. The meaning of "a plurality of" is two or more, unless otherwise specifically limited.
[0063] In the embodiments of the present application, the same reference signs represent the same components, and for the sake of brevity, detailed description of the same components is omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings are only exemplary and should not constitute any limitation on the present application.
[0064] The battery cell is the smallest unit of electrical energy storage, which can include a shell, an end cap assembly and an electrode assembly. The end cap assembly is covered on the shell and forms a cavity with the shell for accommodating the electrode assembly.
[0065] In the related art, in the process of charging and discharging of the battery monomer, the electrode assembly will generate gas such as carbon dioxide gas, and as the gas continues to accumulate, the internal pressure of the battery monomer will continue to rise, and in the case where the internal pressure of the battery monomer reaches a critical value, the battery monomer will explode due to the excessively high internal pressure. In order to reduce the risk of explosion of the battery monomer, the battery monomer is usually provided with a pressure relief mechanism, and in the case where the internal pressure of the battery monomer reaches a critical value, the pressure relief mechanism is opened to make the internal environment of the battery monomer communicate with the external environment, and the gas is discharged to the external environment of the battery monomer to reduce the internal pressure of the battery monomer. However, in the case where the pressure relief mechanism is opened, the active material in the electrode assembly will be ejected with the gas to the external environment of the battery monomer, and the active material will produce a combustion reaction when it comes into contact with air, which is not conducive to improving the safety performance of the battery monomer.
[0066] In order to improve the safety performance of the battery monomer, the end cover assembly and the shell in the battery monomer provided by the embodiments of the present application enclose a first cavity and enclose a second cavity with the cover, the second cavity communicates with the first cavity, by accommodating the electrode assembly in the first cavity and accommodating the gas adsorption member in the second cavity, the gas generated by the electrode assembly can enter the second cavity through the first cavity, and the gas adsorption member can adsorb the gas, thereby effectively improving the case of excessively high internal pressure of the battery monomer and effectively improving the safety performance of the battery monomer.
[0067] The technical solutions described in the embodiments of the present application are applicable to batteries and electric devices using batteries. The electric device can be, but is not limited to, a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be, but is not limited to, a fuel automobile, a gas automobile and a new energy automobile, etc. The new energy automobile can be, but is not limited to, a pure electric automobile, a hybrid electric automobile and a range extended automobile, etc. The spacecraft can be, but is not limited to, an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy can be, but is not limited to, a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool can be, but is not limited to, a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc.
[0068] Referring to FIG. 1, FIG. 1 is a structural schematic diagram of a vehicle 1000 provided in an embodiment of the present application. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, head or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power supply of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery 100 to supply power to the motor 300, for example, to meet the power demand of the vehicle 1000 during starting, navigation and driving.
[0069] In some embodiments of the present application, the battery 100 can not only be used as an operating power supply of the vehicle 1000, but also be used as a driving power supply of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.
[0070] Referring to FIG. 2, FIG. 2 is an exploded schematic diagram of the battery 100 provided in an embodiment of the present application. The battery 100 includes a box body 10 and a battery cell 20, the battery cell 20 being accommodated in the box body 10. The box body 10 is used to provide an accommodation space for the battery cell 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 can include a first part 11 and a second part 12, the first part 11 and the second part 12 being mutually covered, and the first part 11 and the second part 12 jointly defining an accommodation space for accommodating the battery cell 20. The second part 12 can be a hollow structure with one end being open, and the first part 11 can be a plate-shaped structure, the first part 11 being arranged on the open side of the second part 12 to jointly define the accommodation space with the second part 12; or the first part 11 and the second part 12 can both be hollow structures with one side being open, the open side of the first part 11 being arranged on the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can have various shapes, such as a cylinder, a cuboid, etc.
[0071] In some embodiments, the box body 10 can be part of the chassis structure of the vehicle 1000. For example, part of the box body 10 can be at least part of the floor of the vehicle 1000, or part of the box body 10 can be at least part of the cross beam and the longitudinal beam of the vehicle 1000.
[0072] In the battery 100, when the battery cells 20 are multiple, the multiple battery cells 20 can be connected in series, in parallel, or in a mixed connection, where the mixed connection means that the multiple battery cells 20 are connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and then the multiple battery cells 20 are accommodated in the box body 10 as a whole. Of course, the battery 100 can also be that the multiple battery cells 20 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body 10. The battery 100 can also include other structures, for example, the battery 100 can also include a current combing component for realizing the electrical connection between the multiple battery cells 20.
[0073] Each battery cell 20 can be a secondary battery or a primary battery, where the secondary battery means that the battery cell 20 can be activated by charging after being discharged, and the primary battery means that the battery cell 20 cannot be activated by charging after the electrical energy is consumed. The battery cell 20 can 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 can also be, but is not limited to, a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell, or other shaped battery cells 20, where the prismatic battery cell includes a square cell, a blade cell, a multi-prismatic battery cell, and the multi-prismatic battery cell is, for example, a hexagonal prismatic battery cell, etc. The present application is not particularly limited.
[0074] The battery cell 20 provided by the embodiments of the present application will be described below in combination with the accompanying drawings.
[0075] In a first aspect, in combination with FIGS. 3 to 7, the present application provides a battery cell 20, which includes an electrode assembly 21, a shell 22, an end cover assembly 23, a cover 25, and a gas adsorption member 27. The end cover assembly 23 is arranged on the shell 22 and forms a first cavity 24 for accommodating the electrode assembly 21 in cooperation with the shell 22. The cover 25 is connected to the end cover assembly 23 and forms a second cavity 26 in cooperation with the end cover assembly 23, where the second cavity 26 is in communication with the first cavity 24. The gas adsorption member 27 is accommodated in the second cavity 26.
[0076] The electrode assembly 21 is a component in which electrochemical reactions occur in the battery cell 20. The battery cell 20 can 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. The positive electrode sheet and the negative electrode sheet can be provided in plural, and the plural positive electrode sheets and the plural negative electrode sheets can be alternately stacked. The separator can be provided between the adjacent positive electrode sheet and the negative electrode sheet to insulate and separate the positive electrode sheet and the negative electrode sheet. In some embodiments, the positive electrode sheet can be provided in plural, and the negative electrode sheet can be folded to form plural stacked folding sections, and one positive electrode sheet can be held between the adjacent folding sections. In other embodiments, the positive electrode sheet and the negative electrode sheet can be both folded to form plural stacked folding sections. In some embodiments, the separator can be provided in plural, and can be provided between any adjacent positive electrode sheet or negative electrode sheet. In other embodiments, the separator can be continuously provided, and can be provided between any adjacent positive electrode sheet or negative electrode sheet by being folded or wound. The shape of the electrode assembly 21 can be, but is not limited to, a cylindrical shape, a flat shape, a polygonal prism shape, etc. In some embodiments, the electrode assembly 21 can further include tabs including a positive tab and a negative tab, the positive tab being connected to the positive electrode sheet, and the negative tab being connected to the negative electrode sheet, to output or input current of the electrode assembly 21.
[0077] In some embodiments, the battery cell 20 can further include an electrolyte, and the electrolyte can function to conduct ions between the positive electrode sheet and the negative electrode sheet. In some embodiments, the electrolyte can be a liquid electrolyte, and in other embodiments, the electrolyte can be a gel electrolyte, a solid electrolyte, etc.
[0078] In some embodiments, the battery cell 20 can further include an electrode terminal 28, and the electrode terminal 28 can be a component electrically connected to the electrode assembly 21 to output or input electric energy. The electrode terminal 28 can be provided on the end cover assembly 23, and a portion of the electrode terminal 28 can be provided in an internal environment of the battery cell 20 and directly or indirectly connected to the tabs of the electrode assembly 21, and another portion of the electrode terminal 28 can be provided in an external environment of the battery cell 20 and connected to a busbar, a sampling device, etc. The number of the electrode terminal 28 can be two, and the two electrode terminals 28 can be provided on opposite sides of the end cover assembly 23, one of the electrode terminals 28 can be connected to the positive tab, and the other of the electrode terminals 28 can be connected to the negative tab. Alternatively, the electrode terminal 28 can have a columnar structure such as a cylindrical structure, a prismatic structure, etc., or can have a plate structure such as a circular plate, a square plate, etc., and in other embodiments, the electrode terminal 28 can have other irregular three-dimensional structures. The electrode terminal 28 can be made of one metal material, or can be made of a plurality of metal materials, and the metal material can be, but is not limited to, copper, aluminum, nickel, zinc, iron, etc.
[0079] 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 the like. In some embodiments, the shell 22 can include a peripheral wall and a bottom wall, the peripheral wall being annularly arranged on the bottom wall and connected to the peripheral edge of the bottom wall to define the internal environment of the shell 22. The peripheral wall is formed with an opening at an end away from the bottom wall, through which the electrode assembly 21, electrolyte, and the like can enter the internal environment of the shell 22. In some embodiments, the shell 22 can be integrally formed, for example, the shell 22 is integrally formed by a drawing process. In other embodiments, the shell 22 can be formed by separately forming each part of the shell 22 and then connecting the parts together, for example, the peripheral wall of the shell 22 and the bottom wall of the shell 22 are separately formed and then welded together to form an integral whole. The shape of the shell 22 can be, but is not limited to, a cuboid, a cylinder, a hexagonal prism, and the like. The material of the shell 22 can be, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, and the like.
[0080] The end cover assembly 23 is arranged 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 the like are accommodated. The end cover assembly 23 can include a cover body 231 and an insulating member 232, the cover body 231 being arranged on the opening of the shell 22, the cover body 231 can be provided with an electrode lead-out hole, the electrode terminal 28 being arranged in the electrode lead-out hole, and the insulating member 232 being arranged on the side of the cover body 231 facing the electrode assembly 21 to insulate and separate the electrode assembly 21 from the cover body 231. Specifically, the shell 22 and the cover body 231 can form a common connecting surface before other components enter the shell, and when it is necessary to encapsulate the internal environment of the shell 22, the cover body 231 is arranged on the opening of the shell 22. The shape of the cover body 231 can be adapted to the shape of the shell 22 to fit the shell 22. The cover body 231 can be made of a material with certain hardness and strength, so that the cover body 231 is not easily deformed when subjected to extrusion and impact, so that the battery cell 20 can have higher structural strength, and the safety performance can also be improved. The material of the cover body 231 can be, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, and the like.
[0081] In some embodiments, the battery cell 20 can further include a pressure relief mechanism, which is a mechanism for releasing 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 body 231, a pressure relief hole 2311 can be formed on the cover body 231, the pressure relief hole 2311 being in communication with the first cavity 24, in the case where the number of electrode terminals 28 is two, the pressure relief hole 2311 can be formed between the two electrode terminals 28, and the pressure relief mechanism is mounted in the pressure relief hole 2311. In other embodiments, the pressure relief mechanism is mounted on the shell 22, for example, the pressure relief mechanism can be mounted on the bottom wall of the shell 22.
[0082] The cover 25 is used to cooperate with the end cover assembly 23 to form a second cavity 26. The second cavity 26 is in communication with the first cavity 24. The communication structure for communicating the second cavity 26 and the first cavity 24 can be arranged on the cover 25 or the end cover assembly 23. In some embodiments, the cover 25 can be connected with the insulating piece 232 to form the second cavity 26. The connection between the cover 25 and the insulating piece 232 can be, but is not limited to, snap connection, fastening connection, heat fusion, adhesion, etc. In other embodiments, the cover 25 can be connected with the cover body 231 to form the second cavity 26. The connection between the cover 25 and the cover body 231 can be, but is not limited to, snap connection, fastening connection, welding, adhesion, etc.
[0083] The gas adsorption member 27 is a component for absorbing gas. The gas adsorption member 27 is accommodated in the second cavity 26, and the second cavity 26 can accommodate one or more gas adsorption members 27. The gas adsorption member 27 can include a gas adsorption medium and a gas-permeable package for wrapping the gas adsorption medium. The gas adsorption medium is the main functional component of the gas adsorption member 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 with the gas to convert the gas into solid and / or liquid substances, and constrain the solid and / or liquid substances in the gas-permeable package. For example, the gas adsorption medium can be a mixture of basic oxides and hydroxides. As an example, the gas adsorption medium can be a mixture of lithium oxide (such as Li2O) and lithium hydroxide (such as LiOH). The gas adsorption medium can react with carbon dioxide gas (CO2) as follows: Li2O + CO2 = Li2CO3 (reaction 1); 2LiOH + CO2 = Li2CO3 + H2O (reaction 2); Li2O + H2O = 2LiOH (reaction 3);
[0084] In the above reactions, 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 for consuming CO2, thereby improving the adsorption efficiency of the gas adsorption member 27.
[0085] Of course, in other embodiments, the gas adsorption medium can also be a physical adsorption medium, such as molecular sieve, graphene, activated carbon, etc.
[0086] The gas-permeable package is used to constrain the gas adsorption medium. Understandably, the gas-permeable package has good gas permeability, and gas can pass through the gas-permeable package, while liquid and solid are difficult or completely unable to pass through the gas-permeable package. Taking carbon dioxide as an example, the carbon dioxide permeability of the gas-permeable package is greater than 100 cm 3 (cm) x 25 μm / m 2 (micrometers / meter) x 24 hours x 0.1 MPa (megapascal), that is, the carbon dioxide permeability of the gas-permeable package with an area of 1 square meter and a thickness of 25 micrometers is greater than 100 cm 3 The material of the gas-permeable package can be, but is not limited to, polypropylene, polyethylene, polyethylene terephthalate polytetrafluoroethylene, polyvinylidene fluoride, etc.
[0087] The end cover assembly 23 in the battery monomer 20 provided by the embodiment of the present application and the shell 22 enclose to form a first cavity 24 and enclose with the cover 25 to form a second cavity 26. The second cavity 26 is in communication with the first cavity 24. By containing the electrode assembly 21 in the first cavity 24 and containing the gas adsorption member 27 in the second cavity 26, the gas generated by the electrode assembly 21 can enter the second cavity 26 through the first cavity 24, and the gas adsorption member 27 can adsorb the gas, thereby effectively improving the case that the internal pressure of the battery monomer 20 is too high and effectively improving the safety performance of the battery monomer 20.
[0088] In addition, by arranging the gas adsorption member 27 on the end cover assembly 23, the assembly operation of the gas adsorption member 27 is facilitated, and a distance is usually reserved between the end cover assembly 23 and the electrode assembly 21. 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 monomer 20.
[0089] In some embodiments of the present application, the cover 25 and the end cover assembly 23 are detachably connected.
[0090] It should be noted that the detachable connection of the cover 25 and the end cover assembly 23 refers to a connection mode in which the disassembly and assembly operation of the cover 25 and the end cover assembly 23 can be realized without damaging the cover 25, the end cover assembly 23 and the connecting component for connecting the cover 25 and the end cover assembly 23. The detachable connection mode can be, but is not limited to, a buckle connection mode, a threaded connection mode, a bolt connection mode, etc.
[0091] By adopting the above technical solution, the assembly operation of the gas adsorption member 27 is facilitated, and the assembly efficiency of the battery monomer 20 is effectively improved.
[0092] In some embodiments of the present application, referring to FIGS. 7 and 8, the battery monomer 20 further comprises a buckling structure, and the cover 25 and the end cover assembly 23 are connected through the buckling structure.
[0093] In other words, the cover 25 and the end cover assembly 23 are connected in a buckling connection manner.
[0094] By adopting the above technical solution, the assembly operation of the gas adsorption member 27 is more convenient, and the assembly efficiency of the battery monomer 20 is further improved.
[0095] In some embodiments of the present application, referring to FIGS. 7 and 8, the buckling structure comprises a buckling hole portion 2322 and a buckling portion 252, the buckling hole portion 2322 is arranged on one of the end cover assembly 23 and the cover 25, the buckling portion 252 is arranged on the other one of the end cover assembly 23 and the cover 25, and the buckling portion 252 is buckled in the buckling hole portion 2322.
[0096] In some embodiments, the buckling hole portion 2322 is formed on the end cover assembly 23, for example, the buckling hole portion 2322 is formed on the insulating piece 232, and the buckling portion 252 is arranged on the cover 25.
[0097] In some other embodiments, the buckling hole portion 2322 is formed on the cover 25, and the buckling portion 252 is arranged on the end cover assembly 23, for example, the buckling portion 252 is arranged on the insulating piece 232.
[0098] The buckling hole portion 2322 can be a through hole 2321, for example, in the case that the buckling hole portion 2322 is formed on the insulating piece 232, the buckling hole portion 2322 penetrates through the insulating piece 232, and the buckling head of the buckling portion 252 can pass through the buckling hole portion 2322 and be buckled on the port edge of the buckling hole portion 2322. The buckling hole portion 2322 can also be a blind hole, and the buckling head of the buckling hole portion 2322 can be inserted into the buckling hole portion 2322 and buckled on the hole wall of the buckling hole portion 2322. The number of buckling hole portions 2322 and the number of buckling portions 252 can be multiple, and the multiple buckling hole portions 2322 and the multiple buckling portions 252 are arranged one by one.
[0099] In some embodiments, in order to facilitate the insertion of the buckling portion 252 into the buckling hole portion 2322, a chamfer surface can be arranged on the buckling head of the buckling portion 252, so that the buckling portion 252 can be inserted into the buckling hole portion 2322 along the chamfer surface in the direction from the buckling portion 252 to the buckling hole portion 2322.
[0100] By adopting the above technical solution, the assembly operation of the gas adsorption member 27 is more convenient, and the assembly efficiency of the battery monomer 20 is further improved.
[0101] In some embodiments of the present application, referring to FIG. 5, at least part of the second cavity 26 is arranged opposite to the pressure relief hole 2311 in the first direction, which 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. The height direction of the battery cell 20 can refer to the Z direction shown in FIGS. 3-5, and in some embodiments, the height direction of the battery cell 20 can be the lead-out direction of the electrode terminal 28. The width direction of the battery cell 20 can refer to the X direction shown in FIGS. 3-5, and the length direction of the battery cell 20 can refer to the Y direction shown in FIGS. 3-5. The size of the battery cell 20 in the width direction can be the same as or different from the size of the battery cell 20 in the length direction. The shell 22 cooperates with the end cover assembly 23 to define the shape of the battery cell 20. When the electrode terminal 28 is arranged on the end cover assembly 23, the height direction of the battery cell 20 is the thickness direction of the end cover assembly 23, the width direction of the battery cell 20 is the width direction of the end cover assembly 23, and the length direction of the battery cell 20 is the length direction of the end cover 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 in the first direction, which means that the projection of the second cavity 26 on any reference plane perpendicular to the first direction at least partially overlaps 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 can completely overlap 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, or 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, the gas adsorption member 27 can easily adsorb gas, the gas adsorption efficiency is improved, and the situation that the internal pressure of the battery cell 20 is too high is further improved, thereby further improving the safety performance of the battery cell 20.
[0105] In some embodiments of the present application, referring to FIG. 5, the cover body 231 is provided with a pressure relief hole 2311, the cover 25 is connected to the insulating member 232 and forms the second cavity 26 together with the insulating member 232, the insulating member 232 is provided with a through hole 2321 for communicating the second cavity 26 and the pressure relief hole 2311.
[0106] In some embodiments, the through hole 2321 can pass through the insulating member 232 along the first direction mentioned above, and at least part of the through hole 2321 is arranged opposite to the second cavity 26 and the pressure relief hole 2311 in the first direction, that is, at least part of the projection of the through hole 2321 on the reference plane coincides with the projection of the second cavity 26 on the reference plane and the projection of the pressure relief hole 2311 on the reference plane, so that the second cavity 26, the through hole 2321 and the pressure relief hole 2311 can communicate along the first direction to form a pressure relief channel.
[0107] By adopting the technical scheme mentioned above, in the case that the internal pressure of the battery monomer 20 is too high, the gas can be discharged to the external environment of the battery monomer 20 through the second cavity 26, the through hole 2321 and the pressure relief hole 2311 in turn, so that the battery monomer 20 has good pressure relief efficiency, effectively reduces the risk of explosion of the battery monomer 20, and further improves the safety performance of the battery monomer 20.
[0108] In some embodiments of the present application, referring to FIG. 5, at least part of the through hole 2321 protrudes from the side of the cover 25 towards the outside of the second cavity 26, so as to communicate the first cavity 24 and the pressure relief hole 2311.
[0109] In some embodiments, the through hole 2321 can 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 communicates 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 towards the outside of the second cavity 26, so that the branch region communicates the first cavity 24 and the pressure relief hole 2311. As an example, in order to increase the pressure relief area of the battery monomer 20, the number of branch regions can be at least two, and the at least two branch regions are divided into two parts and arranged on opposite sides of the main body region, and one part of the branch region protrudes from one side of the cover 25 towards the outside of the second cavity 26, and the other part of the branch region protrudes from the other side of the cover 25 towards the outside of the second cavity 26.
[0110] By adopting the technical scheme mentioned above, in the case that the internal pressure of the battery monomer 20 is too high, the gas can be discharged to the external environment of the battery monomer 20 through the second cavity 26, the through hole 2321 and the pressure relief hole 2311 in turn, so that the battery monomer 20 has good pressure relief efficiency, effectively reduces the risk of explosion of the battery monomer 20, and further improves the safety performance of the battery monomer 20.
[0111] In some embodiments of the present application, referring to FIG. 5, the second cavity 26 is arranged at one side of the pressure relief hole 2311 in the 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 length direction of the end cover assembly 23 is larger than the width direction of the end cover assembly 23, the second direction can be the length direction of the end cover assembly 23, that is, the second cavity 26 is arranged at one side of the end cover assembly 23 in the length direction, and the pressure relief hole 2311 can be arranged on the middle of the end cover assembly 23 in the length direction.
[0113] In some embodiments, when the end cover assembly 23 includes the cover body 231 and the insulating member 232, the cover body 231 is provided with the pressure relief hole 2311, the pressure relief hole 2311 is located in the middle of the cover body 231 in the second direction, and the cover 25 is connected to one side of the insulating member 232 in the second direction and forms the second cavity 26 with the insulating member 232.
[0114] By adopting the above technical solution, the gas adsorption member 27 can adsorb gas, the gas adsorption efficiency is improved, the situation that the internal pressure of the battery monomer 20 is too high is further improved, and the safety performance of the battery monomer 20 is further improved.
[0115] In some embodiments of the present application, referring to FIG. 5, the number of the cover 25 is multiple, the multiple covers 25 form multiple second cavities 26 with the end cover assembly 23, and at least two second cavities 26 are arranged on opposite sides of the pressure relief hole 2311 in the second direction.
[0116] In some embodiments, the number of the cover 25 is two, and the two covers 25 are respectively connected to opposite sides of the end cover assembly 23 in the second direction. For example, when the end cover assembly 23 includes the cover body 231 and the insulating member 232, the pressure relief hole 2311 is arranged in the middle of the cover body 231 in the second direction, and the two covers 25 are respectively connected to opposite sides of the insulating member 232 in the second direction and form two second cavities 26 with the insulating member 232. Each second cavity 26 contains at least one gas adsorption member 27.
[0117] By adopting the above technical solution, the multiple gas adsorption members 27 can respectively adsorb gas on opposite sides of the end cover assembly 23 in the second direction, the gas adsorption efficiency is further improved, the situation that the internal pressure of the battery monomer 20 is too high is further improved, and the safety performance of the battery monomer 20 is further improved.
[0118] In some embodiments of the present application, referring to FIG. 5, the number of the cover 25 is plural, and the plurality of covers 25 and the end cover assembly 23 enclose to form a plurality of second cavities 26. At least one second cavity 26 is arranged opposite to the pressure relief hole 2311 along a first direction, and at least two other second cavities 26 are arranged on opposite sides of the pressure relief hole 2311 along a second direction. 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 the cover body 231 and the insulating member 232, the pressure relief hole 2311 is arranged in the middle of the cover body 231 along the second direction, and the number of the cover 25 is three. One cover 25 is connected to the middle of the insulating member 232 along the second direction and encloses 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. The other two covers 25 are respectively connected to the opposite sides of the insulating member 232 along the second direction and enclose with the insulating member 232 to form two second cavities 26. Each second cavity 26 contains at least one gas adsorption member 27.
[0120] By adopting the above technical solution, the plurality of gas adsorption members 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, further improving the gas adsorption efficiency, further improving the situation that the internal pressure of the battery monomer 20 is too high, and further improving the safety performance of the battery monomer 20.
[0121] In some embodiments of the present application, referring to FIG. 5, the side of the end cover assembly 23 facing the electrode assembly 21 is provided with a boss 2324 for abutting against the electrode assembly 21. The cover 25 is connected to the boss 2324 and encloses with the boss 2324 to form a second cavity 26.
[0122] The boss 2324 is used for abutting against the electrode assembly 21, so that at least part of the end cover assembly 23 is spaced apart from the electrode assembly 21 to form a gap space. In some embodiments, the end cover assembly 23 includes the cover body 231 and the insulating member 232. The cover body 231 covers the opening of the shell 22, and the insulating member 232 is arranged on the side of the cover body 231 facing the electrode assembly 21. The insulating member 232 includes an insulating body 2323 and the above-mentioned boss 2324. The boss 2324 is provided on the side of the insulating body 2323 facing the electrode assembly 21. The boss 2324 and the insulating body 2323 can be an integrally formed member. For example, the boss 2324 and the insulating body 2323 can be integrally formed by injection molding process. The boss 2324 and the insulating body 2323 can also be separately formed and connected to each other to form an integral whole.
[0123] In some embodiments, the protrusion 2324 is recessed with a groove on the side facing the electrode assembly 21, and the cover 25 is provided on the side of the protrusion 2324 facing the electrode assembly 21 to close the internal space of the groove to form the second cavity 26. The number of the protrusions 2324 can be one or more. Understandably, the number of the cover 25 corresponds to the number of the protrusions 2324.
[0124] In some embodiments, the protrusion 2324 is arranged opposite to the pressure relief hole 2311 in the first direction, and the cover 25 is connected to the protrusion 2324 and enclosed with the protrusion 2324 to form the second cavity 26, so that the second cavity 26 is arranged opposite to the pressure relief hole 2311 in the first direction.
[0125] In some other embodiments, the number of the protrusions 2324 is two, and the number of the cover 25 is two. The two protrusions 2324 are arranged on opposite sides of the insulating body 2323 in the second direction, and the two covers 25 are connected to the two protrusions 2324 one by one and enclosed to form the second cavities 26. Each of the second cavities 26 contains at least one gas adsorption member 27.
[0126] In some other embodiments, the number of the protrusions 2324 is three, and the number of the cover 25 is three. One of the protrusions 2324 is arranged opposite to the pressure relief hole 2311 in the first direction, and the other two protrusions 2324 are arranged on opposite sides of the insulating body 2323 in the second direction. The three covers 25 are connected to the three protrusions 2324 one by one and enclosed to form the second cavities 26. Each of the second cavities 26 contains at least one gas adsorption member 27.
[0127] By adopting the above technical solutions, the cover 25 and the gas adsorption member 27 can be easily assembled.
[0128] In some embodiments of the present application, the surface of the protrusion 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 protrusion 2324 close to the electrode assembly 21 is in the same plane as the surface of the cover 25 close to the electrode assembly 21.
[0130] By adopting the above technical solutions, the protruding space of the protrusion 2324 can be effectively utilized, thereby effectively improving the volume energy density of the battery monomer 20.
[0131] In some embodiments of the present application, referring to FIG. 5, the cover 25 is provided with a gas hole 251 for communicating the first cavity 24 and the second cavity 26.
[0132] The air hole 251 is used to communicate 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 air holes 251 can be one or multiple. 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 forms the second cavity 26 together with the end cover assembly 23. For example, when the end cover assembly 23 includes the cover body 231 and the insulating member 232, the cover 25 is connected to the side of the insulating member 232 facing the electrode assembly 21 and forms the second cavity 26 together with the insulating member 232. The air hole 251 can be arranged on the surface of the cover 25 facing the electrode assembly 21 or on the circumferential side of the cover 25.
[0134] By using 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, effectively improving the situation that the internal pressure of the battery monomer 20 is too high, thereby effectively improving the safety performance of the battery monomer 20.
[0135] In some embodiments of the present application, please refer to FIGS. 3-8, the battery monomer 20 includes an electrode assembly 21, a shell 22, an end cover assembly 23, a cover 25, a gas adsorption member 27, a pressure relief mechanism, and an electrode terminal 28. The end cover assembly 23 includes a cover body 231 and an insulating member 232. The cover body 231 covers the opening of the shell 22 and forms a first cavity 24 together with the shell 22 for accommodating the electrode assembly 21. The insulating member 232 is arranged on the side of the cover body 231 facing the electrode assembly 21 to insulate and separate the electrode assembly 21 from the cover body 231. The cover body 231 is provided with a pressure relief hole 2311 and an electrode lead-out hole. The pressure relief hole 2311 is in communication with the first cavity 24. The pressure relief mechanism is installed in the pressure relief hole 2311. 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 protrudes from 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 part 2322, and the other is provided with a clamping part 252. The clamping part 252 is clamped in the clamping hole part 2322, so that the cover 25 is connected to the boss 2324 and forms a second cavity 26 together with the boss 2324. The number of bosses 2324 and the number of covers 25 are both three. One of the bosses 2324 is located in the middle of the insulating body 2323 along the second direction and is arranged opposite to the pressure relief hole 2311. 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 one by one and form three second cavities 26. Each second cavity 26 contains at least one gas adsorption member 27.
[0136] In a second aspect, referring to FIG. 2, the embodiments of the present application provide a battery 100 comprising the battery cell 20 according to any of the above embodiments.
[0137] The battery 100 provided by the embodiments of the present application effectively improves the safety performance of the battery 100 due to the use of the battery cell 20 according to any of the above embodiments.
[0138] In a third aspect, referring to FIG. 1, the embodiments of the present application provide a power-consuming device comprising the battery 100.
[0139] The power-consuming device provided by the embodiments of the present application effectively improves the safety performance of the power-consuming device due to the use of the battery 100.
[0140] The above merely provides preferred embodiments of the present application but not for limiting the present application. Any modification, equivalent replacement and improvement 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: The battery cell comprises: electrode assembly; case; An end cap assembly, which is disposed on the shell and 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 cavity.
2. The battery cell according to claim 1, wherein: 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 includes a snap-fit structure, and the cover is connected to the end cover assembly via the snap-fit structure.
4. The battery cell according to claim 3, characterized in that The snap-fit structure includes a snap-fitting portion and a snap-fitting portion, wherein the snap-fitting portion is provided in one of the end cover assembly and the sealing cover, and the snap-fitting portion is provided in the other of the end cover assembly and the sealing cover, and the snap-fitting portion is snap-fitted to the snap-fitting portion.
5. The battery cell according to any one of claims 1 to 4, 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 arranged opposite to the pressure relief hole along a first direction, and the first direction is parallel to the thickness direction of the end cover assembly.
7. The battery cell according to claim 6, characterized in that The end cover assembly includes a cover body and an insulating member. The cover body is covered on the shell and is provided with the pressure relief hole. The insulating member is provided 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. 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 any one of claims 5 to 8, 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 enclose 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 any one of claims 5 to 10, characterized in that: There are multiple sealing covers, and the multiple sealing covers and the end cover assembly enclose 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 the other two 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 provided on one side of the end cap assembly facing the electrode assembly, and the cover is connected to the boss and enclosed with 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 13, 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 14, 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 device, characterized in that: The electric device comprises the battery according to claim 16.