Battery cell, end cover assembly, battery, and electric device

Abstract

A battery cell, an end cover assembly, a battery, and an electric device. The battery cell comprises a casing, an electrode assembly, and a pressure relief mechanism. The casing comprises a wall portion. The electrode assembly is provided in the casing. The pressure relief mechanism is provided on the wall portion. The pressure relief mechanism comprises a body, a pressure relief portion, and reinforcing portions. The body is connected to the wall portion, and the pressure relief portion is provided on the body and is configured to release the internal pressure of the battery cell. The reinforcing portions are provided on both sides of the body in a first direction, and the reinforcing portions are spaced apart from the pressure relief portion, thereby facilitating improvement of the reliability of the battery cell.

Description

Battery cell, end cover assembly, battery and electric device

[0001] Cross-reference to Related Applications

[0002] This application claims priority to Chinese Patent Application No. 202421823581.4, filed on July 30, 2024, entitled “Battery cell, end cover assembly, battery and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a battery cell, an end cover assembly, a battery and an electric device. BACKGROUND

[0004] Battery cells are widely used in electronic devices, such as mobile phones, notebook computers, electric vehicles, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes and electric tools, etc. Battery cells can include cadmium-nickel battery cells, hydrogen-nickel battery cells, ion battery cells and secondary alkaline zinc-manganese battery cells, etc.

[0005] In the development of battery technology, how to improve the reliability of the battery is a technical problem that needs to be solved in battery technology.

[0006] Practical new type content

[0007] In view of the above problems, the present application provides a battery cell, an end cover assembly, a battery and an electric device, which is beneficial to improve the reliability of the battery cell.

[0008] In a first aspect, the present application provides a battery cell, comprising: a shell comprising a wall portion; an electrode assembly arranged in the shell; a pressure relief mechanism arranged on the wall portion, the pressure relief mechanism comprising a body, a pressure relief portion and a reinforcing portion, the body being connected with the wall portion, the pressure relief portion being arranged on the body and being configured to release the internal pressure of the battery cell; wherein the body is provided with the reinforcing portion on both sides along a first direction, and the reinforcing portion is spaced apart from the pressure relief portion.

[0009] In some embodiments of the first aspect, by arranging the reinforcing portion spaced apart from the pressure relief portion on both sides of the body along the first direction, the structural strength of the body can be improved, and the reinforcing portion can also deform to reduce or even absorb the pressure transmitted to the pressure relief portion, thereby avoiding the pressure relief portion from releasing its internal pressure when the internal pressure or temperature of the battery cell does not reach a threshold value, reducing the risk of abnormal release of the pressure relief portion, preventing the failure of the pressure relief mechanism, improving the stability of the pressure relief mechanism, and improving the reliability and service life of the pressure relief mechanism, thereby improving the reliability of the battery cell.

[0010] In some embodiments, the pressure relief portion comprises a first recess formed by recessing one side of the body in the first direction. In this way, the reliability of the pressure relief portion in releasing the internal pressure of the battery cell is improved.

[0011] In some embodiments, the reinforcing portion comprises a second recess formed by recessing at least one side of the body in the first direction, and the strength of the body opposite to the second recess in the first direction is greater than the strength of the body opposite to the first recess.

[0012] When the internal pressure or temperature of the battery cell reaches the threshold value, the body opposite to the first recess is activated to break due to the smaller strength, so as to release the internal pressure of the battery cell by the pressure relief portion, facilitating the release of the internal pressure by the pressure relief portion; when the internal pressure or temperature of the battery cell does not reach the threshold value in the normal operation process, the gas in the battery cell still exerts a force on the body in the first direction, and the body opposite to the second recess has greater strength to improve the overall structural strength of the pressure relief mechanism and to cause the body around the second recess to deform to reduce or even absorb the pressure transmitted to the pressure relief portion, thereby reducing the risk of abnormal release of the pressure relief portion and preventing the failure of the pressure relief mechanism, thereby improving the reliability of the battery cell.

[0013] In some embodiments, the minimum thickness dimension of the body opposite to the second recess in the first direction is greater than the minimum thickness dimension of the body opposite to the first recess. In this way, the effectiveness of the pressure relief portion in releasing the internal pressure of the battery cell is ensured, and the effectiveness of the reinforcing portion in improving the overall strength of the pressure relief mechanism and reducing or even absorbing the pressure transmitted to the pressure relief portion is also ensured.

[0014] In some embodiments, the reinforcing portions arranged on both sides of the body in the first direction are staggered on the body. Such a design facilitates the processing and manufacturing of the reinforcing portions, reduces stress concentration on the body, and improves the area of the reinforcing portions distributed on the body to achieve better results.

[0015] In some embodiments, the pressure relief portion and the reinforcing portion are staggered on the body in the first direction. Such a design facilitates the processing and manufacturing of the pressure relief portion and the reinforcing portion, reduces stress concentration on the body, and prevents interference between the pressure relief portion and the reinforcing portion, thereby preventing the failure of the pressure relief mechanism.

[0016] In some embodiments, the minimum distance between the adjacent pressure relief portion and the reinforcing portion is greater than or equal to 2 mm. In this way, the difficulty of manufacturing is reduced, and interference between the pressure relief portion and the reinforcing portion is prevented, thereby preventing the failure of the pressure relief mechanism.

[0017] In some embodiments, the extension trajectory of the reinforcing portion is the same as the extension trajectory of the pressure relief portion. Such a design is conducive to improving the protection of the reinforcing portion on the pressure relief portion, that is, the reinforcing portion is arranged to disperse the pressure conducted to the pressure relief portion, and since the extension trajectories of the two are the same, the pressure conducted to each position of the pressure relief portion can be dispersed by the reinforcing portion to prevent the possibility of a certain position of the pressure relief portion being pressed, thereby improving reliability.

[0018] In some embodiments, the extension trajectory of the reinforcing portion is the same as the extension trajectory of the pressure relief portion. Such a design is conducive to improving the protection of the reinforcing portion on the pressure relief portion, that is, the reinforcing portion is arranged to disperse the pressure conducted to the pressure relief portion, and since the extension trajectories of the two are the same, the pressure conducted to each position of the pressure relief portion can be dispersed by the reinforcing portion to prevent the possibility of a certain position of the pressure relief portion being pressed, thereby improving reliability.

[0019] In some embodiments, the body is partitioned by the pressure relief portion into a first region and a second region, the second region is arranged around the first region, and the first region is provided with at least one reinforcing portion. By arranging in this way, the reliability of the reinforcing portion in dispersing the pressure conducted to the pressure relief portion is improved.

[0020] In some embodiments, the second region is provided with at least one reinforcing portion. The first region and the second region can each be provided with at least one reinforcing portion, which can effectively improve the strength of the pressure relief mechanism and improve the reliability of the reinforcing portion in dispersing the pressure conducted to the pressure relief portion.

[0021] In some embodiments, the number of reinforcing portions arranged in the first region is greater than the number of reinforcing portions arranged in the second region. Such a design layout is reasonable, which can ensure that the pressure relief portion on the body has sufficient arrangement area, and also ensure that sufficient reinforcing portions are arranged to improve the reliability of the pressure relief mechanism, thereby improving the reliability of the battery cell.

[0022] In some embodiments, the housing includes an end cover and a shell, the shell has an opening, the end cover is connected with the shell and closes the opening, and the wall portion is formed in any one of the end cover and the shell. By arranging in this way, the diversity and flexibility of use of the battery cell are improved.

[0023] In a second aspect, the application provides an end cover assembly for a battery cell, comprising: an end cover; a pressure relief mechanism arranged in the end cover, the pressure relief mechanism comprising a body, a pressure relief portion, and a reinforcing portion, the body being connected with the end cover, the pressure relief portion being arranged in the body and being configured to relieve the internal pressure of the battery cell; wherein the body is provided with the reinforcing portion on both sides along a first direction, and the reinforcing portion is distributed apart from the pressure relief portion.

[0024] In some embodiments of the second aspect, by arranging the reinforcing portion on both sides of the body along the first direction and spaced from the pressure relief portion, the structural strength of the region where the body is located can be improved, and the deformation can occur to reduce or even absorb the pressure transmitted to the pressure relief portion, avoiding the pressure relief portion from releasing its internal pressure when the internal pressure or temperature of the battery cell does not reach the threshold value, reducing the risk of abnormal release of the pressure relief portion, preventing the failure of the pressure relief mechanism, helping to improve the stability of the pressure relief mechanism, and also helping to improve the reliability and service life of the pressure relief mechanism, thereby helping to improve the reliability of the end cover assembly.

[0025] In a third aspect, the present application provides a battery comprising the battery cell according to any one of the embodiments of the first aspect.

[0026] In a fourth aspect, the present application provides a power consuming device comprising the battery according to any one of the embodiments of the third aspect, and the battery is configured to provide electric energy.

[0027] The above description is only a summary of the technical solutions of the present application. In order to enable one skilled in the art to better understand the technical means of the present application, the following detailed description of the embodiments of the present application can be implemented according to the content of the description, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following detailed description of the embodiments of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0028] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the alternative embodiments. The accompanying drawings are included to provide a description of the alternative embodiments and are not meant to limit the present application. Moreover, the same reference numerals in all the drawings represent the same or similar elements. In the drawings:

[0029] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0030] FIG. 2 is an exploded structural schematic diagram of a battery according to some embodiments of the present application;

[0031] FIG. 3 is a structural schematic diagram of a battery module according to some embodiments of the present application;

[0032] FIG. 4 is a structural schematic diagram of a battery cell according to some embodiments of the present application;

[0033] FIG. 5 is an exploded structural schematic diagram of a battery cell according to some embodiments of the present application;

[0034] FIG. 6 is a structural schematic diagram of a pressure relief mechanism in a battery cell according to some embodiments of the present application;

[0035] FIG. 7 is a structural schematic diagram of a pressure relief mechanism in a battery cell according to some embodiments of the present application;

[0036] Fig. 8 is a structural schematic view of Fig. 6 from another perspective;

[0037] Fig. 9 is a cross-sectional structural schematic view of Fig. 8 along A-A;

[0038] Fig. 10 is an enlarged view of P in Fig. 9.

[0039] Fig. 11 is a partial cross-sectional structural schematic view of a pressure relief mechanism in a battery cell according to some embodiments of the present application.

[0040] The reference signs in the detailed description are as follows: 1-vehicle; 1000-battery; 2000-controller; 3000-motor; 100a-battery module; 100-battery cell; 200-box body; 210-first box body part; 220-second box body part; 10-outer shell; 11-wall part; 101-end cover; 102-housing; 20-electrode assembly; 30-pressure relief mechanism; 31-body; T1-first region; T2-second region; 32-pressure relief part; 321-first recess; 33-strengthening part; 331-second recess; 40-electrode terminal; 50-first insulating member; 60-second insulating member; X-first direction. DETAILED DESCRIPTION

[0041] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0042] It should be noted that, unless otherwise specified, the technical terms or scientific terms used in the embodiments of the present application should be understood as the usual meaning understood by the skilled person in the field to which the embodiments of the present application belong.

[0043] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0044] In addition, the technical terms "first", "second", and the like are only for description purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0045] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the terms "mount", "connected", "connection", "fixed", and similar terms are to be construed as broadest possible terms, for example, can be fixed connection, can be detachable connection, or integral; can be mechanical connection, can be electrical connection; can be direct connection, can be indirect connection through an intermediate medium, or can be internal connection of two elements or interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0046] In the description of the embodiments of the present application, unless specifically defined and limited otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature can be directly above or obliquely above the second feature, or it can only mean that the first feature is higher than the second feature in horizontal height. The first feature can be directly below or obliquely below the second feature, or it can only mean that the first feature is lower than the second feature in horizontal height.

[0047] At present, from the development of market situation, the application of battery is more and more extensive. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, military equipment, aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0048] The development of battery technology needs to consider many design factors, such as battery life, energy density, discharge capacity, charge-discharge rate and other performance parameters. In addition, the reliability of the battery also needs to be considered.

[0049] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery monomers to provide higher voltage and capacity. For example, the battery mentioned in the present application can include a battery module or a battery pack, etc.

[0050] The battery monomer can be a secondary battery monomer, which refers to a battery monomer that can be activated by charging after discharging to continue to use.

[0051] In the related art, to ensure the safety of a battery monomer, a relief mechanism is usually arranged on the shell of the battery monomer. When the internal pressure or temperature of the battery monomer reaches a threshold value, the relief mechanism is used to discharge the internal substances (liquid, gas) of the battery monomer to release the internal pressure of the battery monomer, so as to prevent the battery monomer from exploding and to improve the reliability of the battery monomer and avoid explosion accidents.

[0052] During the normal operation of the battery monomer, gas is generated in the battery monomer. The gas exerts a certain pressure on the relief mechanism of the battery monomer, so that the battery monomer expands. The position area of the relief mechanism is easily deformed under the action of the gas pressure, thereby easily causing the relief mechanism to abnormally open, i.e., the relief mechanism is easily broken when the internal pressure of the battery monomer has not reached the threshold value, which affects the normal use of the battery monomer and causes safety problems.

[0053] To solve the above technical problems, the embodiments of the present application provide a battery monomer. The battery monomer includes a shell, an electrode assembly, and a relief mechanism. The shell includes a wall portion. The electrode assembly is arranged in the shell. The relief mechanism is arranged on the wall portion and includes a body, a relief portion, and a reinforcing portion. The body is connected to the wall portion. The relief portion is arranged on the body and is configured to release the internal pressure of the battery monomer. The reinforcing portion is arranged on both sides of the body along a first direction and is spaced apart from the relief portion.

[0054] The reinforcing portion can improve the structural strength of the body, i.e., improve the strength of the relief mechanism. In addition, the reinforcing portion can also absorb deformation to reduce the pressure transmitted to the relief portion, avoid the relief portion releasing its internal pressure when the internal pressure or temperature of the battery monomer has not reached the threshold value, reduce the risk of abnormal release of the relief portion, improve the stability of the relief mechanism, and improve the reliability and service life of the relief mechanism, thereby improving the reliability of the battery monomer.

[0055] The technical solutions described in the embodiments of the present application are applicable to various devices using batteries, such as mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, electric vehicles, ships, and spacecraft, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0056] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above-described devices, but can also be applied to all devices using batteries. However, for the sake of brevity, the following embodiments are described by taking electric vehicles as an example.

[0057] For example, as shown in FIG. 1, which is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application, the vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or a range extended vehicle. The vehicle 1 can be provided with a motor 3000, a controller 2000, and a battery 1000, and the controller 2000 is configured to control the battery 1000 to supply power to the motor 3000. For example, the battery 1000 can be arranged at the bottom, the front, or the rear of the vehicle 1. The battery 1000 can be used to supply power to the vehicle 1, for example, the battery 1000 can be used as an operating power source of the vehicle 1, and can be used for the circuit system of the vehicle 1, for example, for the power demand of starting, navigation, and operation of the vehicle 1. In another embodiment of the present application, the battery 1000 can not only be used as an operating power source of the vehicle 1, but also can be used as a driving power source of the vehicle 1, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1.

[0058] As shown in FIG. 2 and FIG. 3, in order to meet different power demands, the battery 1000 can include a plurality of battery cells 100, and the plurality of battery cells 100 can be connected in series, in parallel, or in a mixed connection. The mixed connection refers to a mixture of series connection and parallel connection. The battery 1000 can also be referred to as a battery pack. Alternatively, the plurality of battery cells 100 can be connected in series, in parallel, or in a mixed connection to form a battery module 100a, and the plurality of battery modules 100a can be connected in series, in parallel, or in a mixed connection to form the battery 1000. That is, the plurality of battery cells 100 can be directly connected to form the battery 1000, or the plurality of battery cells 100 can be connected to form the battery module 100a, and the battery module 100a can be connected to form the battery 1000.

[0059] In the present application, the battery cell 100 can include a lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, and the present application is not limited thereto. The battery cell 100 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, and the present application is not limited thereto. The battery cell 100 is generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells, and soft package battery cells, and the present application is not limited thereto.

[0060] As shown in FIG. 2, the battery 1000 according to an embodiment of the present application further includes a box body 200, and the plurality of battery cells 100 are accommodated in the box body 200, and the box body 200 can protect the battery cells 100.

[0061] The box 200 can be a simple cuboid or cylinder or sphere, or a complex cuboid structure composed of a simple cuboid or cylinder or sphere, and the embodiments of the present application are not limited in this regard. The material of the box 200 can be an alloy material such as an aluminum alloy or a ferrous alloy, a polymer material such as polycarbonate or polyisocyanurate foam, or a composite material such as glass fiber and epoxy resin, and the embodiments of the present application are not limited in this regard.

[0062] The box 200 is used to accommodate the battery monomer 100, and the box 200 can have various structures. In some embodiments, the box 200 can include a first box portion 210 and a second box portion 220, the first box portion 210 and the second box portion 220 are mutually covered, and the first box portion 210 and the second box portion 220 jointly define an accommodation cavity 200a for accommodating the battery monomer 100. The first box portion 210 and the second box portion 220 can each be a hollow structure with one side open, and the open side of the first box portion 210 is covered on the open side of the second box portion 220 to form the box 200 with the accommodation cavity 200a. Of course, the first box portion 210 and the second box portion 220 can have various shapes, such as a cylinder, a cuboid, etc. The first box portion 210 can also be a plate structure, and the second box portion 220 can be a hollow structure with one side open.

[0063] To improve the sealing performance of the first box portion 210 and the second box portion 220 after being connected, a sealing member such as sealing glue or a sealing ring can be arranged between the first box portion 210 and the second box portion 220.

[0064] Please refer to FIGS. 4 to 11, according to the embodiments of the present application, a battery monomer 100 is provided, which includes a shell 10, an electrode assembly 20, and a pressure relief mechanism 30. The shell 10 includes a wall portion 11. The electrode assembly 20 is arranged in the shell 10. The pressure relief mechanism 30 is arranged on the wall portion 11, and the pressure relief mechanism 30 includes a body 31, a pressure relief portion 32, and a reinforcing portion 33. The body 31 is connected with the wall portion 11, the pressure relief portion 32 is arranged on the body 31 and is configured to release the internal pressure of the battery monomer 100. The body 31 is provided with the reinforcing portion 33 on both sides along the first direction X, and the reinforcing portion 33 is spaced apart from the pressure relief portion 32.

[0065] The shell 10 is a component for forming an internal environment of the battery monomer 100, and the internal environment formed by the shell 10 can be used to accommodate the electrode assembly 20, and can also be used to accommodate electrolyte and other components. Optionally, the shell 10 can be made of metal or non-metal materials, for example, the metal material can be copper, aluminum or stainless steel, etc.; the non-metal material can be polyethylene, polypropylene or polyvinyl chloride, etc.

[0066] The electrode assembly 20 is a component in which electrochemical reactions occur in the battery cell 100, and one or more electrode assemblies 20 can be included in the case 10. The electrode assembly 20 is mainly formed by winding or layering a positive electrode sheet and a negative electrode sheet, and a separator is generally provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute a main body of the electrode assembly 20, and portions without active materials that each constitute a tab. The positive electrode tab and the negative electrode tab can be located together at one end of the main body or at opposite ends of the main body. During charging and discharging of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminal 40 to form a current loop.

[0067] The pressure relief mechanism 30 is configured to be broken to release the internal pressure of the battery cell 100 when the internal pressure or temperature of the battery cell 100 reaches a threshold value. Optionally, the pressure relief mechanism 30 includes, but is not limited to, structures such as explosion-proof valves, air valves, pressure relief valves, safety valves, etc.

[0068] Specifically, referring to FIGS. 5 and 6, the pressure relief mechanism 30 includes a body 31 and a pressure relief portion 32. The body 31 is detachably connected to the wall portion 11, and can also be integrally formed with the wall portion 11. The body 31 can be directly connected to the wall portion 11, or can be connected to the wall portion 11 through other components. For example, the body 31 can be connected to the wall portion 11 by means of, but not limited to, bolting, riveting, bonding, or clamping.

[0069] The pressure relief portion 32 is configured to release the internal pressure of the battery cell 100. For example, when the internal pressure or temperature of the battery cell 100 reaches a threshold value, the pressure relief portion 32 can form a pressure relief opening on the body 31, so that the inside of the case 10 is in communication with the outside, thereby discharging the internal substances (liquid, gas) of the battery cell 100, achieving pressure relief, and reducing the risk of explosion of the battery cell 100.

[0070] The pressure relief portion 32 can be configured to be connected to the body 31, and the strength of the pressure relief portion 32 is less than that of the body 31. When the internal pressure or temperature of the battery cell 100 reaches a threshold value, the pressure relief portion 32 is actuated to break to release the internal pressure of the battery. Alternatively, referring to FIGS. 8 to 10, the pressure relief portion 32 can further include a first recessed portion 321 recessed on one side of the body 31 along the first direction X. The body 31 opposite to the first recessed portion 321 along the first direction X, that is, the thickness of the body 31 connected to the first recessed portion 321 along the first direction X is less than the thickness of the body 31 at other positions. When the internal pressure or temperature of the battery cell 100 reaches a threshold value, the body 31 opposite to the first recessed portion 321 along the first direction X is actuated to break, and the internal pressure of the battery cell 100 is released to the outside through the pressure relief portion 32, i.e., the first recessed portion 321.

[0071] The first direction X can be understood as a direction of the body 31 towards the electrode assembly 20. For example, when the battery monomer 100 is in a rectangular structure, the first direction X can be the length direction of the battery monomer 100, can also be the width direction of the battery monomer 100, and can also be the height direction of the battery monomer 100. The specific direction can be set according to the position of the wall portion 11 provided with the pressure relief mechanism 30.

[0072] Further, please continue to refer to FIGS. 5 and 6, the pressure relief mechanism 30 further comprises a reinforcing portion 33, the body 31 is provided with the reinforcing portion 33 on both sides along the first direction X, that is, the number of the reinforcing portion 33 is at least two.

[0073] In some embodiments, as shown in FIG. 11, the reinforcing portion 33 can comprise a structure connected to both sides of the body 31 along the first direction X. The reinforcing portion 33 can be integrally provided on the body 31, or can be connected to the body 31 by bolt connection, riveting, adhesion or clamping, or the like. Alternatively, the reinforcing portion 33 is formed by stretching the body 31 along the first direction X, that is, the reinforcing portion 33 protrudes from the body 31 along the first direction X, so as to improve the structural strength of the body 31 along the first direction X, thereby improving the overall structural strength of the pressure relief mechanism 30. During the normal operation of the battery monomer 100, gas is generated inside the battery monomer 100, which exerts a certain pressure on the pressure relief mechanism 30, so that the battery monomer 100 expands to a certain extent. The reinforcing portion 33 protruding from the body 31 has a height difference with the body 31, that is, there is a deformable space. The reinforcing portion 33 and the body 31 at this position can deform to reduce or even absorb the pressure transmitted to the pressure relief portion 32, so as to avoid the pressure relief portion 32 from releasing the internal pressure when the internal pressure or temperature of the battery monomer 100 does not reach the threshold value, reduce the risk of abnormal release of the pressure relief portion 32, and prevent the pressure relief mechanism 30 from failing.

[0074] In some embodiments, the reinforcing portion 33 can further comprise a second recess 331 recessed from at least one side of the body 31 along the first direction X. The strength of the body 31 opposite to the second recess 331 along the first direction X is greater than that of the body 31 opposite to the first recess 321 along the first direction X, or the minimum thickness of the body 31 opposite to the second recess 331 along the first direction X is less than that of the body 31 opposite to the first recess 321 along the first direction X, so as to ensure that the reinforcing portion 33 can improve the overall structural strength of the pressure relief mechanism 30, and can also deform to reduce or even absorb the pressure transmitted to the pressure relief portion 32.

[0075] In the pressure relief mechanism 30, the reinforcing portions 33 can be all arranged as the protruding body 31, all arranged as the second recessed portion 331, or partially arranged as the protruding body 31 and partially arranged as the second recessed portion 331.

[0076] According to an embodiment of the present application, the battery monomer 100 is provided with the reinforcing portions 33 spaced apart from the pressure relief portions 32 on both sides of the body 31 along the first direction X, so that the structural strength of the body 31 can be improved, and the deformation of the body 31 can be caused to reduce or even absorb the pressure transmitted to the pressure relief portions 32, so that the pressure relief portions 32 can avoid releasing the internal pressure when the internal pressure or temperature of the battery monomer 100 does not reach the threshold value, the risk of abnormal release of the pressure relief portions 32 can be reduced, the failure of the pressure relief mechanism 30 can be prevented, the stability of the pressure relief mechanism 30 can be improved, the reliability and service life of the pressure relief mechanism 30 can be improved, and thus the reliability of the battery monomer 100 can be improved.

[0077] Optionally, the number of the pressure relief portions 32 can be one, and can also be two or more. In the first direction X, the side of the body 31 facing the electrode assembly 20 can be provided with the pressure relief portion 32, and the side of the body 31 away from the electrode assembly 20 can also be provided with the pressure relief portion 32. For example, as shown in FIGS. 6 and 7, FIG. 6 can represent the side of the pressure relief mechanism 30 facing the electrode assembly 20 along the first direction X, and FIG. 7 can represent the side of the pressure relief mechanism 30 away from the electrode assembly 20 along the first direction X. The side of the body 31 facing the electrode assembly 20 is provided with the pressure relief portion 32, so that the internal pressure of the battery monomer 100 can be released more quickly through the pressure relief portion 32.

[0078] Optionally, the number of the reinforcing portions 33 can be two, and can also be more. The number of the reinforcing portions 33 can be designed according to the structure and size of the body 31, such as thickness, area, etc., and only needs to ensure that the pressure relief portions 32 are spaced apart from the reinforcing portions 33.

[0079] Referring to FIGS. 6-10, according to some embodiments of the present application, the pressure relief portion 32 includes a first recessed portion 321 recessed on one side of the body 31 along the first direction X.

[0080] The first recessed portion 321 can be understood as a notch, that is, the pressure relief portion 32 includes a notch arranged on one side of the body 31 along the first direction X.

[0081] Optionally, the first recess 321 can be formed on the body 31 by punching or cutting material away. The structural strength of the body 31 corresponding to the first recess 321 in the first direction X is less than that of other parts of the body 31, so that when the internal pressure or temperature of the battery cell 100 reaches a threshold value, the internal pressure of the battery cell 100 can break through the body 31 opposite the first recess 321 to form a pressure relief port at the position of the first recess 321 to release the internal pressure.

[0082] For example, the first recess 321 can be formed on the body 31 by cutting material away, which facilitates the realization that the structural strength of the body 31 corresponding to the first recess 321 is less than that of other parts of the body 31.

[0083] When the internal pressure or temperature of the battery cell 100 reaches a threshold value, the internal pressure of the battery cell 100 breaks through the body 31 opposite the first recess 321 and is discharged to the outside by the first recess 321, thereby reducing the risk of thermal runaway of the battery cell 100 and improving the reliability of the battery cell 100.

[0084] The battery cell 100 provided by one embodiment of the present application is configured in this way, which facilitates improving the reliability of the pressure relief portion 32 in releasing the internal pressure of the battery cell 100.

[0085] Please continue to refer to FIGS. 6-10. In some embodiments, the reinforcing portion 33 includes a second recess 331 recessed by at least one side of the body 31 in the first direction X. In the first direction X, the strength of the body 31 opposite the second recess 331 is greater than that of the body 31 opposite the first recess 321.

[0086] Optionally, the reinforcing portion 33 can be extruded from the body 31 in the first direction X, that is, the first recess 321 can be formed on the body 31 by punching, so that the strength of the body 31 opposite the second recess 331 in the first direction X is greater than that of the body 31 opposite the first recess 321 in the first direction X, and also greater than that of other positions of the body 31, to improve the structural strength of the body 31, i.e., the overall structural strength of the pressure relief mechanism 30.

[0087] The battery monomer 100 provided by one embodiment of the present application is used. When the internal pressure or temperature of the battery monomer 100 reaches a threshold value, the body 31 opposite to the first recess 321 breaks due to the small strength, the internal pressure of the battery monomer 100 is released from the first recess 321, and the function of the pressure relief part 32 releasing the internal pressure is realized. When the internal pressure or temperature of the battery monomer 100 does not reach the threshold value in the normal operation process, the gas in the battery monomer 100 still has the force applied on the body 31 in the first direction X. The body 31 opposite to the second recess 331 has the large strength, the overall structural strength of the pressure relief mechanism 30 is improved, the body 31 around the second recess 331 is deformed to reduce or even absorb the pressure transmitted to the pressure relief part 32, the risk of abnormal release of the pressure relief part 32 is reduced, the pressure relief mechanism 30 is prevented from failing, and the reliability of the battery monomer 100 is improved.

[0088] Specifically, when the gas applies the force in the first direction X on the body 31, the second recess 331 is deformed. The deformation of the second recess 331 is that the area of the second recess 331 changes. The body 31 around the second recess 331 is also deformed. The deformation of the body 31 is that the body 31 is deformed in the first direction X and in the direction intersecting the first direction X. The force transmitted to the pressure relief part 32 is greatly reduced, and the abnormal release of the pressure relief part 32 is avoided.

[0089] Optionally, the reinforcing part 33 can include the second recess 331 formed by the body 31 recessed on one side in the first direction X, and include the protruding structure provided by the body 31 protruding on the other side in the first direction X. Of course, the reinforcing part 33 can also include the second recess 331 formed by the body 31 recessed on both sides in the first direction X.

[0090] Optionally, the shape and extension track of each second recess 331 can be the same or different. Optionally, the opening area of each second recess 331 can be the same or different.

[0091] As shown in FIG. 10, according to some embodiments of the present application, the minimum thickness dimension of the body 31 opposite to the second recess 331 in the first direction X is greater than the minimum thickness dimension of the body 31 opposite to the first recess 321 in the first direction X.

[0092] The minimum thickness dimension refers to the minimum thickness of the body 31 opposite to the second recess 331 in the first direction X.

[0093] The battery monomer 100 provided by one embodiment of the present application is used. Through the above arrangement, the effectiveness of the pressure relief part 32 releasing the internal pressure of the battery monomer 100 is ensured, and the effectiveness of the reinforcing part 33 improving the overall strength of the pressure relief mechanism 30 and reducing or even absorbing the pressure transmitted to the pressure relief part 32 is ensured.

[0094] Optionally, the number of the second recesses 331 can be two or more, and the minimum thickness dimension of the body 31 opposite each second recess 331 along the first direction X can be the same or different, that is, the depth of each second recess 331 along the first direction X can be the same or different.

[0095] For example, as shown in FIG. 10, FIG. 9 shows one first recess 321 and five second recesses 331. From the left to the right direction, the minimum thickness dimension of the body 31 opposite the five second recesses 331 is d1, d2, d3, d4, d5 in turn, and the minimum thickness dimension of the body 31 opposite the first recess 321 is D, wherein the values of d1, d2, d3, d4, d5 can be equal or different, and the values of d1, d2, d3, d4, d5 are all greater than the value of D.

[0096] Optionally, the reinforcing portion 33 can be arranged at the center of the body 31 or at the periphery of the body 31.

[0097] In some embodiments, along the first direction X, the orthographic projections of the reinforcing portions 33 arranged on both sides of the body 31 on the body 31 are staggered with each other.

[0098] It can be understood that, along the first direction X, the orthographic projections of the reinforcing portions 33 arranged on both sides of the body 31 on the body 31 do not overlap with each other.

[0099] The battery monomer 100 provided by one embodiment of the application is arranged in this way, which facilitates the processing and manufacturing of the reinforcing portion 33, reduces the stress concentration on the body 31, and is beneficial to increasing the area of the reinforcing portion 33 distributed on the body 31, so as to achieve better results.

[0100] Optionally, along the first direction X, the orthographic projections of the adjacent two reinforcing portions 33 arranged on one side of the body 31 are surrounded by the orthographic projection of the reinforcing portion 33 arranged on the other side of the body 31 on the body 31.

[0101] Optionally, in the direction perpendicular to the first direction X, the distance between the adjacent two reinforcing portions 33 can be the same or different.

[0102] In some embodiments, along the first direction X, the orthographic projection of the pressure relief portion 32 on the body 31 and the orthographic projection of the reinforcing portion 33 on the body 31 are staggered with each other.

[0103] It can be understood that, along the first direction X, the orthographic projection of the pressure relief portion 32 on the body 31 and the orthographic projection of the reinforcing portion 33 on the body 31 do not overlap with each other.

[0104] The battery monomer 100 provided by one embodiment of the present application is arranged in this way, facilitating the processing and manufacturing of the pressure relief part 32 and the reinforcing part 33, reducing stress concentration on the body 31, and preventing interference between the pressure relief part 32 and the reinforcing part 33, thereby preventing the pressure relief mechanism 30 from failing.

[0105] In some embodiments, the minimum distance between the adjacent pressure relief part 32 and the reinforcing part 33 is greater than or equal to 2 mm.

[0106] The adjacent pressure relief part 32 and the reinforcing part 33 can be understood as the pressure relief part 32 and the reinforcing part 33 with the minimum spacing in the direction perpendicular to the first direction X, i.e., the closest pressure relief part 32 and the reinforcing part 33.

[0107] In this way, the manufacturing difficulty is reduced, and interference between the pressure relief part 32 and the reinforcing part 33 is prevented, thereby preventing the pressure relief mechanism 30 from failing.

[0108] It can be understood that if the minimum distance between the adjacent pressure relief part 32 and the reinforcing part 33 is too small, i.e., less than 2 mm, the pressure relief part 32 and the reinforcing part 33 are arranged too close, increasing the manufacturing difficulty and reducing the product yield. If the pressure relief part 32 and the reinforcing part 33 are arranged too close, the reinforcing part 33 does not have enough space to deform after being stressed, and the pressure may still be transmitted to the pressure relief part 32. Therefore, by the above arrangement, the manufacturing difficulty is reduced, and the pressure relief mechanism 30 is effectively prevented from failing, thereby facilitating the improvement of the reliability of the battery monomer 100.

[0109] Alternatively, the minimum distance between the adjacent pressure relief part 32 and the reinforcing part 33 can be 2 mm, and can also be 3 mm, 4 mm, 5 mm, etc.

[0110] In some embodiments, the extension trajectory of the reinforcing part 33 is the same as the extension trajectory of the pressure relief part 32.

[0111] The extension trajectory of the pressure relief part 32 can be various shapes, for example, the pressure relief part 32 is a runway-shaped groove extending along a runway-shaped trajectory, and correspondingly, the reinforcing part 33 is a runway-shaped groove or a runway-shaped protrusion extending along a runway-shaped trajectory; the pressure relief part 32 is a rectangular groove extending along a rectangular trajectory, and correspondingly, the reinforcing part 33 is a rectangular groove or a rectangular protrusion extending along a rectangular trajectory.

[0112] The battery monomer 100 provided by one embodiment of the present application is arranged in this way, facilitating the improvement of the protection of the reinforcing part 33 on the pressure relief part 32, that is, the reinforcing part 33 can disperse the pressure transmitted to the pressure relief part 32, and because the extension trajectories of the two are the same, the pressure transmitted to each position of the pressure relief part 32 can be dispersed by the reinforcing part 33, preventing the possibility of a certain position of the pressure relief part 32 being stressed, thereby facilitating the improvement of the reliability.

[0113] In some embodiments, the extension trajectory of the reinforcing portion 33 and the extension trajectory of the pressure relief portion 32 are each annular trajectories.

[0114] The pressure relief portion 32 and the reinforcing portion 33 can be closed structures extending along a closed annular trajectory, and can also be intermittent structures or non-closed structures along a non-closed annular trajectory. The extension trajectory of the reinforcing portion 33 and the extension trajectory of the pressure relief portion 32 are the same shape and are annular structures.

[0115] One embodiment of the battery monomer 100 provided by the present application is configured in this way, which is conducive to improving the reliability of the pressure relief portion 32 in relieving the pressure inside the battery monomer 100, and is conducive to ensuring that the reinforcing portion 33 can improve the strength of the pressure relief mechanism 30 as a whole and can reduce or even absorb the pressure transmitted to the pressure relief portion 32.

[0116] As shown in FIG. 10, in some embodiments, the body 31 is divided into a first region T1 and a second region T2 by the pressure relief portion 32, the second region T2 is arranged around the first region T1, and the first region T1 is provided with at least one reinforcing portion 33.

[0117] It can be understood that the extension trajectory of the pressure relief portion 32 is an annular trajectory, one side of the pressure relief portion 32 close to the center position of the body 31 is the first region T1, and the other side of the pressure relief portion 32 close to the peripheral position of the body 31 is the second region T2, the second region T2 is arranged around the first region T1 and the pressure relief portion 32, and the pressure relief portion 32 is arranged around the first region T1.

[0118] One embodiment of the battery monomer 100 provided by the present application is configured in this way, which is conducive to improving the reliability of the reinforcing portion 33 in dispersing and conducting the pressure to the pressure relief portion 32. Moreover, this configuration is reasonable in layout and facilitates the design of the reinforcing portion 33.

[0119] Optionally, the first region T1 can be provided with one reinforcing portion 33, and can also be provided with two or more reinforcing portions 33.

[0120] In some embodiments, the second region T2 is provided with at least one reinforcing portion 33.

[0121] One embodiment of the battery monomer 100 provided by the present application is configured in this way, which is conducive to improving the reliability of the reinforcing portion 33 in dispersing and conducting the pressure to the pressure relief portion 32. Moreover, this configuration is reasonable in layout and facilitates the design of the reinforcing portion 33.

[0122] Optionally, the second region T2 can be provided with one reinforcing portion 33, and can also be provided with two or more reinforcing portions 33.

[0123] In some embodiments, the number of reinforcing portions 33 arranged in the first region T1 is greater than the number of reinforcing portions 33 arranged in the second region T2.

[0124] In one embodiment of the present application, the battery cell 100 is arranged in this way, which is reasonable in layout. The pressure relief portion 32 on the body 31 has sufficient area for arrangement, and a sufficient number of reinforcing portions 33 are arranged to improve the reliability of the pressure relief mechanism 30, thereby improving the reliability of the battery cell 100.

[0125] For example, the second region T2 can be provided with two reinforcing portions 33, and the two reinforcing portions 33 are arranged on the two sides of the body 31 along the first direction X. The first region T1 can be provided with a plurality of reinforcing portions 33.

[0126] As shown in FIG. 5, in some embodiments, the battery cell 100 further includes a first insulating member 50 arranged on the side of the housing 10 facing the electrode assembly 20 along the first direction X. The first insulating member 50 is a component having insulating properties. The first insulating member 50 can insulate and isolate the housing 10 from the electrical connection components inside the battery cell 100. For example, the first insulating member 50 can insulate and isolate the housing 10 and the electrode assembly 20 to reduce the risk of short circuit. The first insulating member 50 can be plastic, rubber, etc.

[0127] In some embodiments, the battery cell 100 further includes a second insulating member 60 arranged on the side of the housing 10 facing away from the electrode assembly 20 along the first direction X. The second insulating member 60 is a component having insulating properties. The second insulating member 60 can insulate and isolate the housing 10 from the electrical connection components outside the battery cell 100. For example, the first insulating member 50 can insulate and isolate the housing 10 and the bus bar to reduce the risk of short circuit. The second insulating member 6040 can be plastic, rubber, etc.

[0128] Please continue to refer to FIG. 5. According to some embodiments of the present application, the housing 10 includes an end cover 101 and a shell 102, the shell 102 has an opening, the end cover 101 is connected with the shell 102 and closes the opening, and the wall portion 11 is formed on any one of the end cover 101 and the shell 102.

[0129] The end cover 101 and the shell 102 can be independent components. An opening can be provided on the shell 102, and the end cover 101 is used to cover the opening to form the internal environment of the battery cell 100.

[0130] The shell 102 can be in various shapes and sizes, such as cuboid, cylinder, hexagonal prism, etc. Specifically, the shape of the shell 102 can be determined according to the specific shape and size of the electrode assembly 20. The material of the shell 102 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not specially limited in the embodiments of the present application.

[0131] In some embodiments, the shell 102 can be a rectangular shell, which includes a bottom wall and four side walls surrounding the edges of the bottom wall. The four side walls surround an opening at one end away from the bottom wall, and the end cover 101 is connected with the four side walls to close the opening.

[0132] In some embodiments, the shell 102 can be a circular shell, which includes a bottom wall and a peripheral wall surrounding the edges of the bottom wall. The peripheral wall surrounds an opening at one end away from the bottom wall, and the end cover 101 is connected with the peripheral wall to close the opening.

[0133] The end cover 101 refers to a component that covers the opening of the shell 102 to isolate the internal environment of the battery monomer 100 from the external environment. Without limitation, the shape of the end cover 101 can be adapted to the shape of the shell 102 to fit the shell 102. The material of the end cover 101 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., which is not specially limited in the embodiments of the present application.

[0134] Optionally, the end cover 101 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 101 is not easy to deform when subjected to extrusion and collision, so that the battery monomer 100 can have higher structural strength, and the reliability can also be improved. In some examples, the shell 102 is a hollow structure with one opening, and the end cover 101 is one that covers the opening of the shell 102. In other examples, the shell 102 is a hollow structure with two openings, and the end cover 101 is two that cover the two openings of the shell 102, respectively.

[0135] The wall part 11 formed in either the end cover 101 or the shell 102 can be understood as that the end cover 101 has the wall part 11 for setting the pressure relief mechanism 30, i.e. the pressure relief mechanism 30 is set in the end cover 101; or the shell 102 has the wall part 11 for setting the pressure relief mechanism 30, i.e. the pressure relief mechanism 30 is set in the shell 102; or the end cover 101 and the shell 102 have the wall part 11 for setting the pressure relief mechanism 30, and the end cover 101 and the shell 102 are both provided with the pressure relief mechanism 30.

[0136] For example, the wall part 11 is formed in the end cover 101, and the pressure relief mechanism 30 is set in the end cover 101.

[0137] In some embodiments, the end cover 101 can be a top cover of the shell 10, that is, the end cover 101 is the highest part of the shell 102 when the battery cell 100 is in use. Among them, the end cover 101 can be manufactured independently, and for this purpose, the pressure relief mechanism 30 can be quickly integrated on the end cover 101, which is conducive to improving the manufacturing efficiency of the battery cell 100 and the manufacturing efficiency of the battery 1000.

[0138] In some alternative embodiments, the end cover 101 and the shell 102 can also be integrated, specifically, the end cover 101 and the shell 102 can form a common connecting surface before other components enter the shell, and when it is necessary to encapsulate the inside of the shell 102, the end cover 101 is combined with the shell 102.

[0139] An embodiment of the present application provides a battery cell 100, which is arranged in this way, which is conducive to improving the diversity and flexibility of use of the battery cell 100.

[0140] As shown in FIG. 5, according to some embodiments of the present application, the present application also provides an end cover assembly for a battery cell 100, comprising an end cover 101 and a pressure relief mechanism 30. The pressure relief mechanism 30 is arranged on the end cover 101, and the pressure relief mechanism 30 comprises a body 31, a pressure relief part 32 and a reinforcing part 33. The body 31 is connected with the end cover 101, and the pressure relief part 32 is arranged on the body 31 and is configured to release the internal pressure of the battery cell 100; wherein the body 31 is provided with the reinforcing part 33 on both sides along the first direction X, and the reinforcing part 33 is spaced apart from the pressure relief part 32.

[0141] In some embodiments of the second aspect, by arranging the reinforcing part 33 on both sides of the body 31 along the first direction X and spaced apart from the pressure relief part 32, the structural strength of the position area where the body 31 is located can be improved, and the body 31 can also be deformed to reduce or even absorb the pressure transmitted to the pressure relief part 32, thereby avoiding the pressure relief part 32 from releasing the internal pressure when the internal pressure or temperature of the battery cell 100 does not reach the threshold value, reducing the risk of abnormal release of the pressure relief part 32, preventing the pressure relief mechanism 30 from failing, improving the stability of the pressure relief mechanism 30, and also improving the reliability and service life of the pressure relief mechanism 30, thereby improving the reliability and service life of the end cover assembly.

[0142] According to some embodiments of the present application, the present application also provides a battery 1000 comprising the battery cell 100 provided in any of the above embodiments.

[0143] According to some embodiments of the present application, the present application provides a power utilization device comprising the battery provided in any of the above embodiments, and the battery is used to provide electric energy.

[0144] To better understand the battery cell 100 provided by the embodiments of the present application, based on the same inventive concept, the embodiments of the battery cell 100 in practical application are provided for description.

[0145] The embodiments of the present application provide a battery cell 100, the battery cell 100 comprises a shell 10, an electrode assembly 20 and a pressure relief mechanism 30, the shell 10 comprises a wall portion 11, the electrode assembly 20 is arranged in the shell 10, the pressure relief mechanism 30 is arranged on the wall portion 11, the pressure relief mechanism 30 comprises a body 31, a pressure relief portion 32 and a reinforcing portion 33, the body 31 is connected with the wall portion 11, the pressure relief portion 32 is arranged on the body 31 and is configured to release the internal pressure of the battery cell 100, the pressure relief portion 32 comprises a first recess 321 recessed on one side of the body 31 along a first direction X, and the reinforcing portion 33 comprises a second recess 331 recessed on at least one side of the body 31 along the first direction X. Wherein, the reinforcing portion 33 is arranged on both sides of the body 31 along the first direction X, and the reinforcing portion 33 is distributed with the pressure relief portion 32.

[0146] In the first direction X, the minimum thickness dimension of the body 31 opposite to the second recess 331 is greater than the minimum thickness dimension of the body 31 opposite to the first recess 321, and the orthographic projection of the pressure relief portion 32 on the body 31 and the orthographic projection of the reinforcing portion 33 on the body 31 are staggered with each other. The minimum distance between the adjacent pressure relief portion 32 and the reinforcing portion 33 is greater than or equal to 2mm, the extension trajectory of the reinforcing portion 33 is the same as the extension trajectory of the pressure relief portion 32 and each presents a ring trajectory. The body 31 is divided into a first area T1 and a second area T2 by the pressure relief portion 32, the second area T2 is arranged around the first area T1, and the number of the reinforcing portion 33 arranged in the first area T1 is greater than the number of the reinforcing portion 33 arranged in the second area T2.

[0147] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0148] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

A battery cell, comprising: a housing including a wall portion; an electrode assembly disposed within the housing; a pressure relief mechanism disposed at the wall portion, the pressure relief mechanism including a body, a pressure relief portion, and a reinforcement portion, the body being connected with the wall portion, the pressure relief portion being disposed at the body and configured to relieve internal pressure of the battery cell; wherein the body is provided with the reinforcement portion on both sides along a first direction, the reinforcement portion being spaced apart from the pressure relief portion. The battery cell of claim 1, wherein, The pressure relief portion includes a first recess disposed by recessing one side of the body along the first direction. The battery cell of claim 2, wherein, The reinforcement portion includes a second recess formed by recessing at least one side of the body along the first direction, the body opposite to the second recess in the first direction having a strength greater than the body opposite to the first recess in the first direction. The battery cell of claim 3, wherein, A minimum thickness dimension of the body opposite to the second recess in the first direction is greater than a minimum thickness dimension of the body opposite to the first recess in the first direction. The battery cell according to any one of claims 1 to 4, wherein Along the first direction, the reinforcement portions disposed on both sides of the body are staggered on the body. The battery cell according to any one of claims 1 to 5, wherein Along the first direction, the pressure relief portion is staggered on the body with the reinforcement portion. The battery cell according to any one of claims 1 to 6, wherein A minimum distance between the pressure relief portion and the reinforcement portion disposed adjacently is greater than or equal to 2 mm. The battery cell according to any one of claims 1 to 7, wherein The reinforcement portion has an extension trajectory with a same shape as an extension trajectory of the pressure relief portion. The battery cell according to any one of claims 1 to 8, wherein The reinforcement portion has an extension trajectory with a same shape as an extension trajectory of the pressure relief portion. The battery cell of claim 9, wherein, The body is partitioned by the pressure relief portion into a first region and a second region, the second region being disposed around the first region, the first region being provided with at least one reinforcement portion. The battery cell of claim 10, wherein, The second region is provided with at least one reinforcement portion. The battery cell of claim 11, wherein, A number of the reinforcement portions disposed at the first region is greater than a number of the reinforcement portions disposed at the second region. The battery cell according to any one of claims 1 to 12, wherein The housing includes an end cap and a shell having an opening, the end cap being connected with the shell and closing the opening, the wall portion being formed at any one of the end cap and the shell. A cap assembly for a battery cell, wherein, Comprising: an end cap; a pressure relief mechanism disposed at the end cap, the pressure relief mechanism including a body, a pressure relief portion, and a reinforcement portion, the body being connected with the end cap, the pressure relief portion being disposed at the body and configured to relieve internal pressure of the battery cell; wherein the body is provided with the reinforcement portion on both sides along a first direction, the reinforcement portion being spaced apart from the pressure relief portion. A battery, wherein, Comprising the battery cell according to any one of claims 1 to 13. An electric power utilization device, wherein, Comprising the battery according to claim 15, the battery being used to provide electric energy.

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