Battery monomer, battery and electric equipment

Abstract

The embodiment of the invention provides a battery monomer, a battery and electric equipment, and belongs to the technical field of batteries. A battery cell includes a case, an electrode assembly, an end cap, and a current collecting member. The electrode assembly has a tab. The shell is provided with an opening and is used for accommodating the electrode assembly; and the end cover is used for covering the opening and is hermetically connected with the shell. The current collecting component is positioned in the shell and is used for connecting the tab and the shell, so that the tab is electrically connected with the shell. A first limiting part is arranged on the inner side face of the shell in a protruding mode, and the current collecting component abuts against the side, facing the electrode assembly, of the first limiting part. The first limiting part has a limiting effect on the current collecting component, so that the current collecting component has a limiting effect on the movement of the electrode assembly, the displacement of the electrode assembly in the shell along the direction of the end cover is reduced, and the risk of connection failure of the tab and the current collecting component caused by overlarge displacement of the electrode assembly is reduced; therefore, the risk of electric connection failure of the battery assembly and the shell is reduced.

Description

[0001] This application is a divisional application of the invention patent application with the application number 202180092647.X and the name "Battery cell, battery, electric device, and manufacturing method and device of battery cell", the application date of which is October 20, 2021. TECHNICAL FIELD

[0002] The present application relates to the technical field of batteries, in particular to a battery cell, a battery and an electric device. BACKGROUND

[0003] The battery commonly used by vehicles is generally a lithium ion battery. As a rechargeable battery, the lithium ion battery has the advantages of small size, high energy density, high power density, high cycle number and long storage time.

[0004] The battery cell generally includes a shell and an electrode assembly. The shell is used to accommodate the electrode assembly and an electrolyte. The metal ions (such as lithium ions) move between the positive and negative electrode sheets of the electrode assembly to generate electric energy. For a general battery cell, the electrode assembly needs to be electrically connected to the shell so that the shell serves as the positive or negative output pole of the battery cell. At present, the electrical connection between the electrode assembly and the shell is prone to failure. SUMMARY

[0005] The embodiments of the present application provide a battery cell, a battery and an electric device, which can reduce the risk of failure of the electrical connection between the battery assembly and the shell.

[0006] In a first aspect, the embodiments of the present application provide a battery cell, comprising: an electrode assembly having a tab; a shell having an opening, the shell being used to accommodate the electrode assembly; an end cover used to cover the opening and being in sealed connection with the shell; a current collecting member accommodated in the shell and located on a side of the electrode assembly facing the end cover, the current collecting member being used to connect the tab and the shell to realize the electrical connection between the tab and the shell; wherein an inner side surface of the shell is provided with a first limiting portion, the first limiting portion being used to limit the movement of the end cover in a direction close to the electrode assembly, and the current collecting member abuts against a side of the first limiting portion facing the electrode assembly.

[0007] In the technical solution, the current collecting member is used to realize the electrical connection between the tab and the shell, and the current collecting member abuts against the side of the first limiting part facing the electrode assembly, so that good current flow between the current collecting member and the shell is ensured. The first limiting part not only limits the end cover, but also limits the current collecting member, so that the movement of the current collecting member relative to the electrode assembly is limited, the displacement of the electrode assembly in the direction of the end cover in the shell is reduced, and the risk of disconnection between the tab and the current collecting member due to excessive displacement of the electrode assembly is reduced, thereby reducing the risk of disconnection between the battery assembly and the shell.

[0008] In some embodiments, the current collecting member comprises: a body part located on the side of the first limiting part facing the electrode assembly, the body part being used to connect the tab; and an elastic part connected to the body part, the elastic part being used to abut against the first limiting part in a direction away from the electrode assembly.

[0009] In the technical solution, the elastic part abuts against the first limiting part in a direction away from the electrode assembly, the elastic part has elastic deformation capability, and the elastic part can elastically deform according to the distance change between the body part and the first limiting part, so that the elastic part has a good buffering effect on the electrode assembly and reduces the risk of damage of the electrode assembly due to rigid impact of the electrode assembly on the current collecting member. In addition, the elastic part will always be in an abutting state against the first limiting part when the battery assembly moves in the shell due to vibration of the battery cell, thereby reducing the risk of disconnection between the current collecting member and the shell due to vibration of the battery cell.

[0010] In some embodiments, the elastic part is a spring arranged in the body part by bending.

[0011] In the technical solution, the elastic part is a spring arranged in the body part by bending, which has a simple structure, is easy to form, and has good deformation capability.

[0012] In some embodiments, the elastic part comprises: a first bending part used to abut against the first limiting part; and a second bending part used to connect the first bending part and the body part, wherein, in the thickness direction of the end cover, the part opposite to the first bending part of the body part is arranged in a gap with the first bending part.

[0013] In the technical solution, the elastic part includes the first bending part and the second bending part connected with each other, the first bending part and the second bending part are formed by bending, and the forming is simple. The part opposite to the first bending part of the body part is arranged in a gap with the first bending part, the gap between the body part and the first bending part can provide a deformation space for the first bending part, so that the first bending part has the ability to deform in the direction away from the body part and in the direction close to the body part, and the elastic part can play a good buffering effect on the electrode assembly when the electrode assembly moves in the direction close to the end cover, and the risk of damage caused by the rigid impact of the electrode assembly on the current collecting member is reduced.

[0014] In some embodiments, the battery monomer further includes an elastic layer supported between the body part and the first bending part.

[0015] In the technical solution, the elastic layer is supported between the body part and the first bending part, the elastic layer can play a good elastic supporting effect on the first bending part, the buffering effect of the elastic part on the electrode assembly is enhanced, and the ability of the first bending part to recover deformation after deforming in the direction close to the body part is improved.

[0016] In some embodiments, the second bending part is connected to the edge of the body part, and the first bending part is arranged to bend in the direction close to the body part relative to the second bending part.

[0017] In the technical solution, the second bending part is connected to the edge of the body part, so that the second bending part has a good deformation ability relative to the body part, the first bending part is arranged to bend in the direction close to the body part relative to the second bending part, so that the first bending part has a good deformation ability relative to the second bending part, so that the whole elastic part has a good deformation ability. In addition, since the second bending part is connected to the edge of the body part, the second bending part is closer to the inner side of the shell, so that more parts of the first bending part can abut against the first limiting part, the contact area of the first bending part and the first limiting part is increased, and the flow area between the current collecting member and the shell is increased.

[0018] In some embodiments, the body part has an outer surface facing the end cover, and the outer surface is provided with a first accommodating part for accommodating at least a part of the elastic part.

[0019] In the technical solution, the outer surface of the body part is provided with the first accommodating part, the first accommodating part can provide an accommodation space for the elastic part, so as to reduce the size of the elastic part protruding from the outer surface of the body part, reduce the internal space occupied by the elastic part, and leave more space for the electrode assembly, which is conducive to improving the energy density of the battery monomer.

[0020] In some embodiments, the elastic part has an abutting surface facing the end cover, the abutting surface being used to abut against the first limiting part, and the abutting surface is flush with the outer surface.

[0021] In the technical solution, the abutting surface is flush with the outer surface of the body part, so that the outer surface of the body part can also abut against the first limiting part, thereby increasing the contact area between the current collecting member and the first limiting part, and further increasing the flow area between the current collecting member and the shell.

[0022] In some embodiments, the region of the body part where the first accommodating part is arranged is provided with a through hole.

[0023] In the technical solution, the through hole is arranged on the body part, so that the discharge inside the battery monomer located on the side of the body part facing the electrode assembly can flow to the side of the body part facing the end cover through the through hole, which is conducive to the discharge of the discharge inside the battery monomer to the outside of the battery monomer when the battery monomer is in thermal runaway, and improves the safety of the battery monomer.

[0024] In some embodiments, the body part is provided with a plurality of elastic parts distributed along the circumference of the body part.

[0025] In the technical solution, the plurality of elastic parts distributed along the circumference of the body part can all abut against the first limiting part, thereby increasing the contact area between the current collecting member and the first limiting part, and further increasing the flow area between the current collecting member and the shell, so as to realize large-area flow. In addition, the plurality of elastic parts distributed along the circumference of the body part can all play a buffering role on the electrode assembly, further reducing the risk of damage to the electrode assembly due to impact.

[0026] In some embodiments, the body part has a plurality of welding areas distributed along the circumference of the body part, the welding areas being used for welding with the tab, and at least one elastic part is arranged between two adjacent welding areas in the circumference of the body part.

[0027] In the technical solution, at least one elastic part is arranged between two adjacent welding areas in the circumference of the body part, so that the elastic part and the welding area of the body part for welding with the tab are arranged in a staggered manner in the circumference of the body part. The welding mark formed by the welding of the welding area and the tab is not easily affected by the elastic part, so that the size of the welding mark in the radial direction of the current collecting member is as large as possible, the risk of polarization of the electrode assembly is reduced, and the service life of the battery monomer is improved.

[0028] In some embodiments, the body part has an inner surface facing away from the end cover, and the inner surface is provided with a second accommodating part located in the welding area, the second accommodating part being used to accommodate at least a portion of the tab.

[0029] In the technical solution, the inner surface of the body part is provided with a second accommodating part located in the welding area, the second accommodating part can accommodate at least part of the tab, thereby reducing the internal space of the shell occupied by the tab, freeing up more space for the body part of the electrode assembly, and facilitating the improvement of the energy density of the battery monomer.

[0030] In some embodiments, the current collecting member comprises: a body part located on the side of the first limiting part facing the electrode assembly, the body part being used for connecting the tab; and a hanging buckle part connected to the body part, the hanging buckle part being used for hanging buckle cooperation with the first limiting part to limit the movement of the body part towards or away from the end cover.

[0031] In the technical solution, the hanging buckle part of the current collecting member cooperates with the first limiting part to limit the movement of the body part towards or away from the end cover, and can always maintain close contact between the current collecting member and the first limiting part, thereby enhancing the stability of the electrical connection between the current collecting member and the shell and ensuring the flow area between the current collecting member and the shell.

[0032] In some embodiments, the hanging buckle part comprises: a first connecting part connected to the body part, the first connecting part being used for abutting against the side of the first limiting part facing the electrode assembly; a second connecting part used for abutting against the side of the first limiting part away from the electrode assembly; and a third connecting part used for connecting the first connecting part and the second connecting part.

[0033] In the technical solution, the first connecting part and the second connecting part of the hanging buckle part abut against the two sides of the first limiting part respectively, so that the hanging buckle part and the first limiting part have a larger contact area, thereby increasing the flow area between the current collecting member and the shell.

[0034] In some embodiments, the first connecting part, the third connecting part and the second connecting part are sequentially connected and jointly define a limiting groove, and the limiting groove is used for accommodating at least part of the first limiting part. The hanging buckle part with such a structure is simple in structure and easy to form.

[0035] In some embodiments, the battery monomer further comprises: a conductive layer used for connecting the first limiting part and the third connecting part.

[0036] In the technical solution, the first limiting part and the third connecting part are connected through the conductive layer, thereby realizing the electrical connection between the first limiting part and the third connecting part and further increasing the flow area between the current collecting member and the shell.

[0037] In some embodiments, the first limiting part is in the form of an annular structure extending circumferentially along the shell. In the technical solution, the first limiting part is in a ring structure, which is easy to be manufactured, and the first limiting part can limit the end cover in the whole circumference, thereby ensuring the limiting ability of the first limiting part to the end cover and the current collecting member.

[0038] In some embodiments, the outer side surface of the shell is provided with a roller groove at a position corresponding to the first limiting part.

[0039] In the technical solution, the outer side surface of the shell is provided with a roller groove, and the first limiting part is formed at a position corresponding to the roller groove during the forming of the roller groove, thereby limiting the current collecting member and the electrode assembly in the shell. The first limiting part is simple to be formed, and the assembly of the battery monomer is simple and has good economy.

[0040] In some embodiments, the shell has a second limiting part, and at least a part of the end cover is located between the first limiting part and the second limiting part in the thickness direction of the end cover. The first limiting part and the second limiting part are used to jointly limit the movement of the end cover in the thickness direction of the end cover.

[0041] In the technical solution, the second limiting part can jointly limit the movement of the end cover in the thickness direction of the end cover with the first limiting part, so that the end cover cannot move relative to the shell, thereby ensuring the firmness of the connection between the end cover and the shell.

[0042] In some embodiments, the battery monomer further comprises a sealing member for sealing the end cover and the shell, and the sealing member is located on a side of the first limiting part away from the electrode assembly.

[0043] In the technical solution, the sealing member is used to realize the sealed connection between the end cover and the shell, thereby ensuring the sealing performance of the end cover and the shell. The sealing member is located on a side of the first limiting part away from the electrode assembly, so that the current collecting member cannot affect the arrangement of the sealing member, thereby improving the sealing performance between the end cover and the shell.

[0044] In a second aspect, the embodiments of the present application provide a battery comprising a plurality of battery monomers provided by any one of the embodiments of the first aspect.

[0045] In a third aspect, the embodiments of the present application provide a power consumption device comprising a battery provided by any one of the embodiments of the second aspect.

[0046] In a fourth aspect, the embodiments of the present application provide a method for manufacturing a battery cell, comprising: providing a shell, the shell having an opening; providing an electrode assembly, the electrode assembly having a tab; providing an end cover; providing a current collecting member; connecting the current collecting member to the tab; accommodating the electrode assembly and the current collecting member in the shell; performing roll groove processing on the shell, so that a part of the shell forming a roll groove corresponds to a first limiting part protruding from an inner side surface of the shell; covering the end cover on the opening, and sealingly connecting the end cover with the shell; the first limiting part is used for limiting movement of the end cover towards the electrode assembly, the current collecting member is located on a side of the electrode assembly facing the end cover, and the current collecting member abuts against a side of the first limiting part facing the electrode assembly.

[0047] In some embodiments, the current collecting member comprises a body part and an elastic part, the body part is connected to the tab, and the elastic part is connected to the body part; during the roll groove processing on the shell, the part of the shell forming a roll groove extrudes the elastic part, so that the elastic part is bent relative to the body part, so that the elastic part abuts against the first limiting part in a direction away from the electrode assembly.

[0048] In the above technical solution, during the roll groove processing on the shell, the part of the shell forming a roll groove extrudes the elastic part of the current collecting member, so that the elastic part is bent relative to the body part and elastically abuts against the first limiting part, that is, after the roll groove processing on the shell, the elastic part of the current collecting member elastically abuts against the first limiting part, and the assembly efficiency of the battery cell is improved.

[0049] In some embodiments, after covering the end cover on the opening, the method further comprises: performing flanging processing on the shell, so that the shell forms a second limiting part, so that the second limiting part and the first limiting part jointly limit movement of the end cover in a thickness direction of the end cover.

[0050] In the above technical solution, the second limiting part limiting the end cover is formed by performing flanging processing on the shell, and the forming method of the second limiting part is simple and efficient.

[0051] Fifthly, embodiments of this application provide a manufacturing apparatus for a battery cell, comprising: a first providing device for providing a housing having an opening; a second providing device for providing an electrode assembly having tabs; a third providing device for providing an end cap; a fourth providing device for providing a current collector; an assembly device for connecting the current collector to the tabs; further comprising for accommodating the electrode assembly and the current collector within the housing; further comprising for performing a grooving process on the housing such that a first limiting portion protruding from the inner side surface of the housing is formed at the grooving portion; further comprising for covering the opening with the end cap and sealing the end cap to the housing; the first limiting portion restricting the end cap from moving towards the electrode assembly, the current collector being located on the side of the electrode assembly facing the end cap, and the current collector abutting against the side of the first limiting portion facing the electrode assembly. Attached Figure Description

[0052] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0053] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0054] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments; Figure 2 This application provides schematic diagrams of the battery structure for some embodiments. Figure 3 Exploded views of a single battery cell provided in some embodiments of this application; Figure 4 for Figure 3 A cross-sectional view of the battery cell shown; Figure 5 Partial views of a battery cell provided for some embodiments of this application; Figure 6 Partial views of a battery cell provided for other embodiments of this application; Figure 7 for Figure 5 and Figure 6A structural schematic diagram of the current collecting member shown; Figure 8 A partial view of a battery cell provided for some embodiments of the present application; Figure 9 A partial view of a battery cell provided for some embodiments of the present application; Figure 10 A flow chart of a manufacturing method of a battery cell provided for some embodiments of the present application; Figure 11 A schematic diagram of roll slot processing of a shell provided for some embodiments of the present application; Figure 12 A schematic diagram of flanging processing of a shell provided for some embodiments of the present application; Figure 13 A structural schematic diagram of a manufacturing device of a battery cell provided for some embodiments of the present application.

[0055] Fig. 10: battery cell; 11: shell; 111: inner side surface; 112: first limiting part; 113: outer side surface; 114: roll slot; 115: second limiting part; 12: electrode assembly; 121: main body part; 122: tab; 13: end cover; 14: current collecting member; 141: body part; 1411: outer surface; 1412: first accommodating part; 1413: through hole; 1414: welding area; 1415: inner surface; 1416: second accommodating part; 142: elastic part; 1421: first bending part; 1422: second bending part; 1423: abutting surface; 144: hanging buckle part; 1441: first connecting part; 1442: second connecting part; 1443: third connecting part; 1444: limiting slot; 15: sealing member; 16: electrode terminal; 17: elastic layer; 18: conductive layer; 20: box body; 21: first part; 22: second part; 100: battery; 200: controller; 300: motor; 1000: vehicle; 2000: manufacturing device; 2100: first providing device; 2200: second providing device; 2300: third providing device; 2400: fourth providing device; 2500: assembling device; Z: thickness direction. DETAILED DESCRIPTION

[0056] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0057] Unless otherwise defined, all technical and scientific terms used in the present application have the same meanings as those commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. All publications, patent applications, patents, and other references mentioned in the specification are indicative of the level of those skilled in the art to which this application pertains. Throughout this application, the term "including" and "containing" and variations thereof mean "including without limitation." Throughout this application, the terms "first," "second," and "third" and variations thereof can be used to distinguish between different objects, but do not necessarily indicate a particular order or a particular numbering of the objects.

[0058] Reference throughout this application to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another.

[0059] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0060] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, detailed description of the same parts 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, as well as the overall thickness, length, width and other dimensions of the integrated device, are only exemplary and should not constitute any limitation on the present application.

[0061] "Multiple" appearing in the present application refers to two or more (including two).

[0062] In the present application, the battery cell can include a lithium ion secondary battery, a lithium ion primary battery, a lithium-sulfur battery, a sodium lithium ion battery, a sodium ion battery, or a magnesium ion battery, etc., which is not limited by the embodiments of the present application. The battery cell can be in the shape of a cylinder, a flat body, a cuboid or other shapes, etc., which is also not limited by the embodiments of the present application. The battery cell is generally divided into three types according to the packaging method: cylindrical battery cell, square battery cell and soft package battery cell, which is also not limited by the embodiments of the present application.

[0063] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells 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. The battery generally includes a box for packaging one or more battery cells. The box can avoid the influence of liquid or other foreign matters on the charging or discharging of the battery cells.

[0064] The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector. The positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer serves as a positive electrode tab. Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector. The negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that no fuse occurs when passing a large current, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc. In addition, the electrode assembly can be a winding type structure or a laminated type structure, and the embodiments of the present application are not limited thereto.

[0065] For a general battery cell, the electrode assembly needs to be electrically connected with the shell to make the shell as a positive output pole or a negative output pole of the battery cell. At present, the electrical connection between the electrode assembly and the shell is prone to failure.

[0066] In the battery cell, the shell is a hollow structure with one end open, and the shell has a bottom wall arranged opposite to the opening. The tabs of the electrode assembly are electrically connected with the shell through a current collecting member, wherein the current collecting member is welded with the bottom wall of the shell to make the shell as one output pole (positive output pole or negative output pole) of the battery cell. The inventors have found that the electrode assembly has a large moving space in the shell. Since the current collecting member is welded with the bottom wall of the shell, when the battery cell is in a vibrating environment, the electrode assembly will have a large displacement relative to the shell, thereby causing the connection between the tabs of the electrode assembly and the current collecting member to fail, and the risk of electrical connection failure between the electrode assembly and the shell occurs.

[0067] In view of this, the battery cell provided in the embodiments of the present application includes an electrode assembly, a shell, an end cover and a current collecting member. The electrode assembly has a tab. The shell has an opening. The shell is used to accommodate the electrode assembly. The end cover is used to cover the opening and is sealingly connected with the shell. The current collecting member is located in the shell and is used to connect the tab and the shell to achieve electrical connection between the tab and the shell. The inner side of the shell is provided with a first limiting portion. The first limiting portion is used to limit the movement of the end cover towards the electrode assembly. The current collecting member abuts against one side of the first limiting portion facing the electrode assembly.

[0068] In the battery cell, the electrical connection between the tab and the shell is achieved by the current collecting member. The current collecting member abuts against one side of the first limiting portion facing the electrode assembly, which ensures good current flow between the current collecting member and the shell. The first limiting portion not only limits the end cover, but also limits the current collecting member, so that the current collecting member limits the movement of the electrode assembly, reduces the displacement of the electrode assembly in the shell along the direction of the end cover, and reduces the risk of connection failure between the tab and the current collecting member due to excessive displacement of the electrode assembly, thereby reducing the risk of electrical connection failure between the battery assembly and the shell.

[0069] In addition, since the current collecting member abuts against one side of the first limiting portion facing the electrode assembly, the first limiting portion can separate the current collecting member and the end cover. On the one hand, it reduces the influence of the current collecting member on the end cover and improves the sealing of the end cover and the shell. On the other hand, the current collecting member is far away from the end cover, reducing the risk of electrification of the end cover.

[0070] The battery cell described in the embodiments of the present application is suitable for a battery and an electric device using the battery.

[0071] The electric device can be 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 a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes 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 includes 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. The embodiments of the present application do not specially limit the above electric devices.

[0072] The following embodiments take the electric device as a vehicle for example for convenient description.

[0073] Please refer to Figure 1 , Figure 1A structural schematic diagram of a vehicle 1000 is provided in some embodiments 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 the operating power supply of the vehicle 1000.

[0074] The vehicle 1000 can further include a controller 200 and a motor 300, and the controller 200 is 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.

[0075] In some embodiments of the present application, the battery 100 can not only be used as the operating power supply of the vehicle 1000, but also be used as the driving power supply of the vehicle 1000, to replace or partially replace the fuel or natural gas to provide driving power for the vehicle 1000.

[0076] In some embodiments, please refer to Figure 2 , Figure 2 A structural schematic diagram of the battery 100 is provided in some embodiments of the present application. The battery 100 includes a plurality of battery monomers 10. The plurality of battery monomers 10 can be connected in series, in parallel or in a mixed manner. The mixed connection means that the plurality of battery monomers 10 are connected in series and in parallel.

[0077] In some embodiments, the battery 100 can further include a current collecting component, and the plurality of battery monomers 10 can be electrically connected through the current collecting component to realize the series connection, parallel connection or mixed connection of the plurality of battery monomers 10.

[0078] The current collecting component can be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0079] In some embodiments, the battery monomer 10 can further include a box 20 for accommodating the battery monomer 10. The box 20 can include a first part 21 and a second part 22, and the first part 21 and the second part 22 are overlapped with each other to define an accommodation space for accommodating the battery monomer 10. Of course, the connection between the first part 21 and the second part 22 can be sealed by a sealing element, which can be a sealing ring, sealing glue, etc.

[0080] The first part 21 and the second part 22 can be various shapes, such as a cuboid, a cylinder, etc. The first part 21 can be a hollow structure with one side open, and the second part 22 can also be a hollow structure with one side open. The open side of the second part 22 covers the open side of the first part 21, thereby forming a box 20 with a containing space. Of course, the first part 21 can be a hollow structure with one side open, and the second part 22 can be a plate structure. The second part 22 covers the open side of the first part 21, thereby forming a box 20 with a containing space.

[0081] Please refer to Figure 3 , Figure 3 The exploded view of the battery cell 10 provided for some embodiments of the present application can include a housing 11, an electrode assembly 12, an end cover 13, a current collecting member 14, and a sealing member 15.

[0082] The housing 11 is a component for containing the electrode assembly 12. The housing 11 can be a hollow structure with one end open, or a hollow structure with both ends open. The material of the housing 11 can be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The housing 11 can be various shapes, such as a cylinder, a cuboid, etc. For example, in the embodiment shown in FIG. 1, the housing 11 is a cylinder. Figure 3

[0083] The electrode assembly 12 is a component in which an electrochemical reaction occurs in the battery cell 10. The electrode assembly 12 can include a main body 121 and a tab 122 protruding from an end of the main body 121. The main body 121 can include a positive electrode sheet, a negative electrode sheet, and a separator. The main body 121 can be a jelly-roll structure formed by winding the positive electrode sheet, the separator, and the negative electrode sheet. The main body 121 can also be a stacked structure formed by stacking the positive electrode sheet, the separator, and the negative electrode sheet.

[0084] The positive electrode sheet includes a positive current collector and positive active material layers coated on both sides of the positive current collector. The negative electrode sheet includes a negative current collector and negative active material layers coated on both sides of the negative current collector. The main body 121 is a portion of the electrode assembly 12 corresponding to the region where the active material layers are coated on the electrode sheets, and the tab 122 is a portion of the electrode sheet where the active material layers are not coated. The tab 122 can be divided into a positive tab and a negative tab, which protrude from both ends of the main body 121, respectively.

[0085] ​The end cover 13 is a component that covers the opening of the shell 11 to isolate the internal environment of the battery cell 10 from the external environment. The end cover 13 covers the opening of the shell 11, and the end cover 13 and the shell 11 together define a sealed space for accommodating the electrode assembly 12, the electrolyte, and the current collecting member 14. The shape of the end cover 13 can be adapted to the shape of the shell 11, for example, the shell 11 is a cuboid structure, and the end cover 13 is a rectangular plate structure adapted to the shell 11, or for example, the shell 11 is a cylindrical structure, and the end cover 13 is a circular plate structure adapted to the shell 11. The material of the end cover 13 can also be various, for example, the end cover 13 can be a metal material, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cover 13 can be the same as or different from the material of the shell 11.

[0086] In the battery cell 10, the end cover 13 can be one or two. If the shell 11 is a hollow structure with an opening at one end, one end cover 13 is correspondingly provided; if the shell 11 is a hollow structure with openings at both ends, two end covers 13 are correspondingly provided, and the two end covers 13 cover the two openings of the shell 11, respectively, one of the positive and negative electrode tabs of the electrode assembly 12 is electrically connected to one end cover 13, and the other is electrically connected to the shell 11. In the embodiment in which the shell 11 is a hollow structure with an opening at one end, an electrode terminal 16 (not shown) can be provided at the end of the shell 11 away from the end cover 13, and the electrode terminal 16 is insulatedly connected to the shell 11, one of the positive and negative electrode tabs of the electrode assembly 12 is electrically connected to the shell 11, and the other is electrically connected to the electrode terminal 16. Figure 3

[0087] The current collecting member 14 is a component located inside the shell 11 and connecting the shell 11 and the electrode assembly 12 to achieve electrical connection between the electrode assembly 12 and the shell 11, so that the shell 11 serves as one output pole of the battery cell 10. The current collecting member 14 can be a disc-shaped member provided between the end cover 13 and the electrode assembly 12, for example, the shell 11 is a cylinder, and the current collecting member 14 is a disc structure. The current collecting member 14 can be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0088] The sealing member 15 is a component provided between the end cover 13 and the shell 11 to achieve sealed connection of the end cover 13 and the shell 11. The material of the sealing member 15 can be various, such as rubber, plastic, etc.

[0089] In some embodiments, the battery cell 10 can further include a pressure relief mechanism for actuating when the internal pressure or temperature of the battery cell 10 reaches a threshold value to release the internal pressure of the battery cell 10.

[0090] ​The pressure relief mechanism can be a separate component mounted on the end cover 13. For example, the pressure relief mechanism can be a rupture disc, a burst disc, a gas valve, a pressure relief valve, or a safety valve mounted on the end cover 13. The pressure relief mechanism can also be a part of the end cover 13. For example, the end cover 13 can have a score groove, and the area defined by the score groove forms the pressure relief mechanism.

[0091] "Actuation" refers to the pressure relief mechanism being activated to a state in which the internal pressure and temperature of the battery cell 10 can be released. The actuation of the pressure relief mechanism can include, but is not limited to, at least a portion of the pressure relief mechanism being broken, fractured, torn, or opened, etc. When the pressure relief mechanism is actuated, the high-temperature and high-pressure material inside the battery cell 10 is discharged as an emission from the actuated part. In this way, the battery cell 10 can be pressure released and temperature released in a controllable pressure or temperature, thereby avoiding a potentially more serious accident.

[0092] The emission from the battery cell 10 referred to in this application includes, but is not limited to, electrolyte, dissolved or split positive and negative electrode sheets, fragments of the separator, high-temperature and high-pressure gas generated by the reaction, flame, etc.

[0093] Please refer to Figure 4 , Figure 4 for Figure 3 the cross-sectional view of the battery cell 10, the embodiment of the present application provides a battery cell 10, which includes a shell 11, an electrode assembly 12, an end cover 13, and a current collecting member 14. The electrode assembly 12 has a tab 122. The shell 11 has an opening, and the shell 11 is used to accommodate the electrode assembly 12. The end cover 13 is used to cover the opening and is sealingly connected with the shell 11. The current collecting member 14 is accommodated in the shell 11 and is located on the side of the electrode assembly 12 facing the end cover 13. The current collecting member 14 is used to connect the tab 122 and the shell 11 to achieve the electrical connection between the tab 122 and the shell 11. The inner side surface 111 of the shell 11 protrudes a first limiting portion 112, and the first limiting portion 112 is used to limit the movement of the end cover 13 towards the electrode assembly 12. The current collecting member 14 abuts against the side of the first limiting portion 112 facing the electrode assembly 12.

[0094] The current collecting member 14 is a component that achieves the electrical connection between the shell 11 and the tab 122. The current collecting member 14 and the tab 122 can be fixedly connected, for example, the current collecting member 14 and the tab 122 are welded. The tab 122 referred to here can be the positive tab of the electrode assembly 12, or the negative tab of the electrode assembly 12, that is, the current collecting member 14 can be connected with the positive tab 122 or the negative tab 122. For example, in Figure 4 ​​​​​​​In the middle, the end of the shell 11 away from the end cover 13 can be provided with an electrode terminal 16, the electrode terminal 16 is insulatedly connected with the shell 11, the negative electrode tab of the electrode assembly 12 is connected with the current collecting member 14, and the positive electrode tab of the electrode assembly 12 is connected with the electrode terminal 16.

[0095] The current collecting member 14 abuts against one side of the first limiting portion 112 facing the electrode assembly 12, so that the current collecting member 14 and the first limiting portion 112 are in contact with each other to realize the electrical connection between the current collecting member 14 and the shell 11. The current collecting member 14 and the first limiting portion 112 can be only in abutting relationship, or they can be fixed together after abutting against each other, for example, the current collecting member 14 and the first limiting portion 112 are abutted against each other and welded together. The current collecting member 14 abuts against one side of the first limiting portion 112 facing the electrode assembly 12, and the current collecting member 14 can occupy the space between the electrode assembly 12 and the first limiting portion 112, thereby reducing the space for the movement of the electrode assembly 12 in the shell 11.

[0096] The inner side surface 111 of the shell 11 refers to the inner side surface of the side wall of the shell 11 extending in the thickness direction Z of the end cover 13. It can be understood that the inner side surface 111 extends substantially in the thickness direction Z of the end cover 13. In the embodiment in which the shell 11 is a cylinder, the inner side surface 111 of the shell 11 is a cylindrical surface. In the embodiment in which the shell 11 is a cuboid, the inner side surface 111 of the shell 11 includes four side surfaces located at different positions and connected in sequence.

[0097] The inner side surface 111 of the shell 11 is provided with the first limiting portion 112. It can be understood that the first limiting portion 112 protrudes from the inner side surface 111. The first limiting portion 112 is a structure for limiting the movement of the end cover 13 towards the electrode assembly 12. The current collecting member 14 abuts against one side of the first limiting portion 112 facing the electrode assembly 12, and the current collecting member 14 is located on one side of the electrode assembly 12 facing the end cover 13. It can be understood that in the thickness direction Z of the end cover 13, the first limiting portion 112 is located between the electrode assembly 12 and the end cover 13. The first limiting portion 112 and the shell 11 can be an integrally formed structure, or they can be a structure connected together after being formed separately, for example, the first limiting portion 112 is welded with the shell 11. The first limiting portion 112 can be various structures, for example, the first limiting portion 112 is a boss protruding from the inner side surface 111 of the shell 11, or the first limiting portion 112 is an annular structure extending in the circumferential direction of the shell 11.

[0098] The electrical connection between the tab 122 and the shell 11 is achieved by the current collecting member 14 abutting against the side of the first limiting portion 112 facing the electrode assembly 12, which ensures good current flow between the current collecting member 14 and the shell 11. The first limiting portion 112 not only limits the end cover 13, but also limits the current collecting member 14, so that the current collecting member 14 limits the movement of the electrode assembly 12, reduces the displacement of the electrode assembly 12 in the direction of the end cover 13 in the shell 11, and reduces the risk of the connection between the tab 122 and the current collecting member 14 being invalid due to excessive displacement of the electrode assembly 12, thereby reducing the risk of the connection between the components of the battery 100 and the shell 11 being invalid.

[0099] In addition, since the current collecting member 14 abuts against the side of the first limiting portion 112 facing the electrode assembly 12, the first limiting portion 112 can separate the current collecting member 14 and the end cover 13, which on the one hand reduces the influence of the current collecting member 14 on the end cover 13 and improves the sealing of the end cover 13 and the shell 11, and on the other hand makes the current collecting member 14 far away from the end cover 13, thereby reducing the risk of the end cover 13 being electrified.

[0100] In some embodiments, please refer to Figure 5 , Figure 5 The partial view of the battery monomer 10 provided by some embodiments of the present application shows that the current collecting member 14 includes a body portion 141 and an elastic portion 142. The body portion 141 is located on the side of the first limiting portion 112 facing the electrode assembly 12, and the body portion 141 is used to connect the tab 122. The elastic portion 142 is connected to the body portion 141, and the elastic portion 142 is used to abut against the first limiting portion 112 in the direction away from the electrode assembly 12.

[0101] The body portion 141 is the part of the current collecting member 14 connected to the tab 122, so as to achieve the electrical connection between the current collecting member 14 and the electrode assembly 12. For example, the body portion 141 is welded to the tab 122. Taking the shell 11 as a cylindrical body as an example, the body portion 141 can be a disc structure located in the shell 11.

[0102] The elastic portion 142 is the part of the current collecting member 14 abutting against the first limiting portion 112 and having the elastic deformation capability. The elastic portion 142 abuts against the side of the first limiting portion 112 facing the electrode assembly 12 in the direction away from the electrode assembly 12. The elastic portion 142 is located on the side of the body portion 141 facing the first limiting portion 112. The elastic portion 142 and the body portion 141 can be an integrally formed structure, or can be a structure connected together after being separately formed. The elastic portion 142 can be various structures, such as a spring, or a resilient sheet. The elastic portion 142 connected to the body portion 141 can be one or multiple.

[0103] The elastic portion 142 abuts against the first limiting portion 112 in a direction away from the electrode assembly 12. The elastic portion 142 has an elastic deformation capability. The elastic portion 142 can elastically deform according to a distance change between the body portion 141 and the first limiting portion 112, so that the elastic portion 142 plays a good buffering role on the electrode assembly 12, and reduces the risk of being damaged due to rigid impact of the electrode assembly 12 on the current collecting member 14. In addition, the elastic portion 142 will always remain in an abutting state of abutting against the first limiting portion 112 when the battery 100 assembly moves in the shell 11 due to vibration of the battery cell 10, thereby reducing the risk of invalidation of the electrical connection between the current collecting member 14 and the shell 11 due to vibration of the battery cell 10.

[0104] In some embodiments, please continue to refer to Figure 5 The elastic portion 142 is a spring sheet arranged in the body portion 141 in a bent manner.

[0105] The spring sheet refers to a sheet body with elasticity. The spring sheet can be a metal material, for example, a copper sheet, an aluminum sheet, etc.

[0106] The spring sheet is arranged in the body portion 141 in a bent manner. Understandably, the spring sheet is in a bent state, so that it has an elastic deformation capability. Before the spring sheet is formed, the spring sheet can have a straight line structure. After the spring sheet is formed in a bent manner, the spring sheet has a broken line structure, so that the spring sheet has an elastic deformation capability.

[0107] In the embodiment, the elastic portion 142 is a spring sheet arranged in the body portion 141 in a bent manner. The structure is simple and easy to form, and has a good deformation capability. In addition, the spring sheet can form a large-area contact with the convex portion, which is beneficial to overcurrent.

[0108] In some embodiments, please continue to refer to Figure 5 The elastic portion 142 includes a first bent portion 1421 and a second bent portion 1422. The first bent portion 1421 is used to abut against the first limiting portion 112. The second bent portion 1422 is used to connect the first bent portion 1421 and the body portion 141. In the thickness direction Z of the end cover 13, the part opposite to the first bent portion 1421 of the body portion 141 is arranged in a gap with the first bent portion 1421.

[0109] The first bent portion 1421 is the part of the elastic portion 142 abutting against the first limiting portion 112. After the first bent portion 1421 abuts against the first limiting portion 112, the first bent portion 1421 can be arranged in a stack with the first limiting portion 112 in the thickness direction Z of the end cover 13. The first bent portion 1421 can be a sheet body in a flat plate shape.

[0110] The second bending portion 1422 is a portion of the elastic portion 142 connecting the first bending portion 1421 and the body portion 141. The second bending portion 1422 is arranged to be bent relative to the first bending portion 1421, and a fold is formed at the connection between the second bending portion 1422 and the first bending portion 1421. The second bending portion 1422 can also be a flat sheet.

[0111] In the thickness direction Z of the end cover 13, the portion of the body portion 141 opposite the first bending portion 1421 is a portion covered by the projection of the first bending portion 1421.

[0112] In the present embodiment, the elastic portion 142 includes the first bending portion 1421 and the second bending portion 1422 connected to each other, and the first bending portion 1421 and the second bending portion 1422 are formed by bending, which is simple to form. The portion of the body portion 141 opposite the first bending portion 1421 is arranged to be spaced apart from the first bending portion 1421, and the space between the body portion 141 and the first bending portion 1421 can provide a deformation space for the first bending portion 1421, so that the first bending portion 1421 not only has the ability to deform in a direction away from the body portion 141, but also has the ability to deform in a direction close to the body portion 141, so that the elastic portion 142 can well buffer the electrode assembly 12 when the electrode assembly 12 moves in a direction close to the end cover 13, reducing the risk of damage caused by rigid impact of the electrode assembly 12 on the current collecting member 14.

[0113] In some embodiments, please refer to Figure 6 , Figure 6 A partial view of the battery cell 10 provided for another embodiment of the present application, the battery cell 10 further includes an elastic layer 17 supported between the body portion 141 and the first bending portion 1421.

[0114] The elastic layer 17 is an elastic component supported between the body portion 141 and the first bending portion 1421. The elastic layer 17 can be a spring, an elastic rubber or the like.

[0115] The elastic layer 17 can well support the first bending portion 1421, enhance the buffering effect of the elastic portion 142 on the electrode assembly 12, and improve the ability of the first bending portion 1421 to recover after deforming in a direction close to the body portion 141.

[0116] In some embodiments, please refer to Figure 5 and Figure 6 The second bending portion 1422 is connected to the edge of the body portion 141, and the first bending portion 1421 is arranged to be bent relative to the second bending portion 1422 in a direction close to the body portion 141.

[0117] The edge of the body portion 141 refers to the edge position of the outer circumferential surface of the body portion 141. Before the elastic portion 142 is formed, assuming that the second bending portion 1422 and the first bending portion 1421 are coplanar, the second bending portion 1422 is bent relative to the first bending portion 1421 in the direction close to the body portion 141, so that the first bending portion 1421 and the second bending portion 1422 are located in different planes, and the first bending portion 1421 is arranged to be bent relative to the second bending portion 1422 in the direction close to the body portion 141.

[0118] For example, the body portion 141 is a disc-shaped structure, in the radial direction of the body portion 141, the end of the second bending portion 1422 away from the first bending portion 1421 exceeds the first limiting portion 112.

[0119] The second bending portion 1422 is connected to the edge of the body portion 141, so that the second bending portion 1422 has good deformation ability relative to the body portion 141, and the first bending portion 1421 is arranged to be bent relative to the second bending portion 1422 in the direction close to the body portion 141, so that the first bending portion 1421 has good deformation ability relative to the second bending portion 1422, so that the entire elastic portion 142 has good deformation ability. In addition, since the second bending portion 1422 is connected to the edge of the body portion 141, the second bending portion 1422 is closer to the inner side surface 111 of the shell 11, so that more parts of the first bending portion 1421 can abut against the first limiting portion 112, increase the contact area of the first bending portion 1421 and the first limiting portion 112, and increase the flow area between the current collecting member 14 and the shell 11.

[0120] In some embodiments, please refer to Figures 5-7 , Figure 7 For Figure 5 and Figure 6 The structure diagram of the current collecting member 14, the body portion 141 has an outer surface 1411 facing the end cover 13, and the outer surface 1411 of the body portion 141 is provided with a first accommodating portion 1412 for accommodating at least a part of the elastic portion 142.

[0121] The outer surface 1411 of the body portion 141 refers to the surface of the body portion 141 facing the end cover 13 and closest to the end cover 13. The outer surface 1411 is provided with the first accommodating portion 1412, which can be understood as being recessed from the outer surface 1411 of the body portion 141 in the direction close to the electrode assembly 12.

[0122] The first accommodating portion 1412 can be a groove structure provided on the outer surface 1411 of the body portion 141. The first accommodating portion 1412 serves to accommodate the elastic portion 142, and can be configured such that the elastic portion 142 is entirely accommodated in the first accommodating portion 1412 or such that the elastic portion 142 is partially accommodated in the first accommodating portion 1412. The first accommodating portion 1412 can be one or a plurality of portions. For example, when the elastic portion 142 in the current collector member 14 is one, the first accommodating portion 1412 can be one. For another example, when the elastic portion 142 in the current collector member 14 is a plurality of portions, the first accommodating portion 1412 can also be a plurality of portions, each of which accommodates at least one first elastic portion 142.

[0123] For example, when the elastic portion 142 includes the first bent portion 1421 and the second bent portion 1422, the first bent portion 1421 and the second bent portion 1422 can be accommodated in the first accommodating portion 1412, so that the elastic portion 142 is entirely accommodated in the first accommodating portion 1412. Alternatively, the first bent portion 1421 can be accommodated in the first accommodating portion 1412, and the second bent portion 1422 can be at least partially located outside the first accommodating portion 1412, so that the elastic portion 142 is partially accommodated in the first accommodating portion 1412. In the embodiment in which the portion of the body portion 141 opposite to the first bent portion 1421 is spaced apart from the first bent portion 1421, the first bent portion 1421 is arranged opposite to the bottom surface of the first accommodating portion 1412 in the thickness direction Z of the end cover 13.

[0124] The outer surface 1411 of the body portion 141 is provided with the first accommodating portion 1412, which can provide accommodation space for the elastic portion 142, thereby reducing the size of the elastic portion 142 protruding from the outer surface 1411 of the body portion 141, reducing the internal space occupied by the elastic portion 142, and leaving more space for the electrode assembly 12, which is conducive to improving the energy density of the battery monomer 10.

[0125] In some embodiments, please continue to refer to Figures 5-7 The elastic portion 142 has an abutting surface 1423 facing the end cover 13, which is used to abut against the first limiting portion 112, and the abutting surface 1423 is flush with the outer surface 1411.

[0126] The abutting surface 1423 refers to the surface of the elastic portion 142 used to abut against the first limiting portion 112. The abutting surface 1423 is flush with the outer surface 1411, i.e., the abutting surface 1423 is coplanar with the outer surface 1411. The abutting surface 1423 and the outer surface 1411 are both planar surfaces.

[0127] The abutting surface 1423 is flush with the outer surface 1411 of the main body 141, so that the outer surface 1411 of the main body 141 can also abut against the first limiting part 112, thereby increasing the contact area between the current collecting member 14 and the first limiting part 112, and further increasing the flow area between the current collecting member 14 and the housing 11.

[0128] In some embodiments, a through hole 1413 is provided in the area of ​​the body portion 141 where the first receiving portion 1412 is provided.

[0129] A through hole 1413 is provided in the area of ​​the body portion 141 where the first receiving portion 1412 is provided; in other words, a through hole 1413 is provided on the bottom surface of the first receiving portion 1412. The through hole 1413 on the body portion 141 forms a discharge channel for discharging emissions from inside the battery cell 10. The body portion 141 has an inner surface 1415 facing the electrode assembly 12, and the inner surface 1415 of the body portion 141 is the surface of the body portion 141 facing the electrode assembly 12 and closest to the electrode assembly 12. The through hole 1413 can simultaneously penetrate the bottom surface of the first receiving portion 1412 and the inner surface 1415 of the body portion 141 to form a discharge channel.

[0130] The through hole 1413 in the area where the first receiving portion 1412 is provided on the body portion 141 can be one or more. For example, in... Figure 7 In the middle, the area of ​​the main body 141 where the first receiving part 1412 is provided is provided with a plurality of through holes 1413.

[0131] In an embodiment where the end cap 13 has a pressure relief mechanism, the discharge flow inside the battery cell 10 passes through the through hole 1413 and is finally discharged to the outside of the battery cell 10 through the pressure relief mechanism.

[0132] The main body 141 is provided with a through hole 1413, and the discharge inside the battery cell 10 located on the side of the main body 141 facing the electrode assembly 12 can flow through the through hole 1413 to the side of the main body 141 facing the end cap 13. This is beneficial for the discharge of the discharge inside the battery cell 10 to the outside of the battery cell 10 in the event of thermal runaway, thereby improving the safety of the battery cell 10.

[0133] In some embodiments, please continue to refer to Figure 7 The main body 141 is provided with a plurality of elastic parts 142 distributed circumferentially along the main body 141.

[0134] In an embodiment where a first receiving portion 1412 for accommodating an elastic portion 142 is provided on the body portion 141, one first receiving portion 1412 may correspond to at least one elastic portion 142, that is, one first receiving portion 1412 may accommodate one elastic portion 142, or one first receiving portion 1412 may accommodate multiple elastic portions 142. For example, in... Figure 7In some embodiments, please continue to refer to

[0135] The plurality of elastic portions 142 distributed along the circumference of the body portion 141 can all abut against the first limiting portion 112, increasing the contact area between the current collecting member 14 and the first limiting portion 112, and further increasing the flow area between the current collecting member 14 and the shell 11, achieving large-area flow. In addition, the plurality of elastic portions 142 distributed along the circumference of the body portion 141 can all play a buffering role on the electrode assembly 12, further reducing the risk of damage to the electrode assembly 12 due to impact.

[0136] In some embodiments, please continue to refer to Figure 7 The body portion 141 has a plurality of welding areas 1414 distributed along the circumference, and the welding area 1414 is used for welding with the tab 122. In the circumference of the body portion 141, at least one elastic portion 142 is arranged between two adjacent welding areas 1414.

[0137] The welding area 1414 is the part of the body portion 141 and the tab 122 for welding. In the circumference of the body portion 141, at least one elastic portion 142 is arranged between two adjacent welding areas 1414, that is, one elastic portion 142 can be arranged between two adjacent welding areas 1414, or a plurality of elastic portions 142 can be arranged between two adjacent welding areas 1414. For example, in Figure 7 In some embodiments, please continue to refer to

[0138] In the embodiment in which the body portion 141 is provided with the first accommodating portion 1412 for accommodating the elastic portion 142, in the circumference of the body portion 141, one welding area 1414 can be formed between two adjacent first accommodating portions 1412, so that the first accommodating portion 1412 and the welding area 1414 are arranged alternately in the circumference of the body portion 141. For example, the welding area 1414 and the first accommodating portion 1412 are both substantially fan-shaped, and the elastic portion 142, the first accommodating portion 1412 and the welding area 1414 on the body portion 141 are all three.

[0139] In the embodiment, at least one elastic portion 142 is arranged between two adjacent welding areas 1414 in the circumferential direction of the body portion 141, so that the elastic portion 142 is arranged in the circumferential direction of the body portion 141 away from the welding area 1414 of the body portion 141 for welding with the tab 122. The welding area 1414 is not easily affected by the elastic portion 142 when the welding area 1414 is welded with the tab 122 to form a welding spot, so that the size of the welding spot in the radial direction of the current collecting member 14 is as large as possible, the risk of polarization of the electrode assembly 12 is reduced, and the service life of the battery monomer 10 is improved.

[0140] In some embodiments, please continue to refer to Figure 5 and Figure 6 The body portion 141 has an inner surface 1415 facing away from the end cover 13. The inner surface 1415 of the body portion 141 is provided with a second accommodating portion 1416 located at the welding area 1414, and the second accommodating portion 1416 is used to accommodate at least a part of the tab 122.

[0141] The inner surface 1415 of the body portion 141 is the surface of the body portion 141 facing the electrode assembly 12 and closest to the electrode assembly 12. The inner surface 1415 of the body portion 141 is provided with a second accommodating portion 1416 located at the welding area 1414. It can be understood that the second accommodating portion 1416 is recessed from the inner surface 1415 of the body portion 141 in a direction away from the electrode assembly 12, and the second accommodating portion 1416 is located at the welding area 1414.

[0142] Taking an example of forming a welding area 1414 between two first accommodating portions 1412 adjacent in the circumferential direction of the body portion 141, the second accommodating portion 1416 and the first accommodating portion 1412 can be arranged alternately in the circumferential direction of the body portion 141.

[0143] The second accommodating portion 1416 can accommodate at least a part of the tab 122, thereby reducing the occupation of the internal space of the shell 11 by the tab 122, so as to leave more space for the main body portion 121 of the electrode assembly 12, which is beneficial to improve the energy density of the battery monomer 10. In addition, the part of the welding area 1414 where the second accommodating portion 1416 is arranged has a thinner thickness, which facilitates the welding and fixation of the welding area 1414 and the tab 122, and ensures the firmness after the welding area 1414 and the tab 122 are welded. Taking an example of realizing the welding of the welding area 1414 and the tab 122 by means of penetration welding, since the part of the welding area 1414 where the second accommodating portion 1416 is arranged has a thinner thickness, it is easy to realize the welding of the welding area 1414 and the tab, and the firmness after the welding is ensured. In some embodiments, please refer to Figure 8 , Figure 8In some embodiments of the application, the battery cell 10 is provided with a partial view of the current collecting member 14, which includes a body portion 141 and a hook portion 144. The body portion 141 is located on the side of the first limiting portion 112 facing the electrode assembly 12, and is used to connect the tab 122. The hook portion 144 is connected to the body portion 141, and is used to hook with the first limiting portion 112 to limit the movement of the body portion 141 towards or away from the end cover 13.

[0144] The body portion 141 is the part of the current collecting member 14 that connects with the tab 122 to achieve electrical connection between the current collecting member 14 and the electrode assembly 12. In some embodiments, the body portion 141 is welded to the tab 122. In some embodiments, the battery cell 10 has a cylindrical shell 11, and the body portion 141 is a disc structure located inside the shell 11.

[0145] The hook portion 144 is the part of the current collecting member 14 that hooks with the first limiting portion 112. The hooking of the hook portion 144 with the first limiting portion 112 limits the movement of the body portion 141 towards or away from the end cover 13, i.e. limits the movement of the body portion 141 in the thickness direction Z of the end cover 13. In some embodiments, the hook portion 144 of the current collecting member 14 is one, and in some embodiments, the hook portion 144 of the current collecting member 14 is multiple. Figure 8 In some embodiments, the hook portion 144 of the current collecting member 14 is multiple, and the multiple hook portions 144 are distributed along the circumference of the body portion 141.

[0146] In some embodiments, the hooking of the hook portion 144 of the current collecting member 14 with the first limiting portion 112 limits the movement of the body portion 141 towards or away from the end cover 13, and always maintains the close contact between the current collecting member 14 and the first limiting portion 112, thereby enhancing the stability of the electrical connection between the current collecting member 14 and the shell 11, and ensuring the flow area between the current collecting member 14 and the shell 11.

[0147] In some embodiments, the hook portion 144 includes a first connecting portion 1441, a second connecting portion 1442, and a third connecting portion 1443. The first connecting portion 1441 is connected to the body portion 141, and is used to abut against the side of the first limiting portion 112 facing the electrode assembly 12. The second connecting portion 1442 is used to abut against the side of the first limiting portion 112 facing away from the electrode assembly 12. The third connecting portion 1443 is used to connect the first connecting portion 1441 and the second connecting portion 1442.

[0148] The first connecting portion 1441 is a portion of the hanging buckle portion 144 abutting against one side of the first limiting portion 112 facing the electrode assembly 12. The first connecting portion 1441 is a portion of the hanging buckle portion 144 abutting against one side of the first limiting portion 112 facing away from the electrode assembly 12. It can be understood that the second connecting portion 1442 and the first connecting portion 1441 abut against two sides of the first limiting portion 112 in the thickness direction Z of the end cover 13 respectively. The third connecting portion 1443 is a portion of the hanging buckle portion 144 connecting the first connecting portion 1441 and the second connecting portion 1442 together.

[0149] The first connecting portion 1441 and the second connecting portion 1442 of the hanging buckle portion 144 abut against two sides of the first limiting portion 112 respectively, so that the hanging buckle portion 144 has a larger contact area with the first limiting portion 112, and the flow area between the current collecting member 14 and the shell 11 is increased.

[0150] In some embodiments, the first connecting portion 1441, the third connecting portion 1443 and the second connecting portion 1442 are sequentially connected and collectively define a limiting groove 1444 for accommodating at least a portion of the first limiting portion 112.

[0151] The limiting groove 1444 is collectively defined by the first connecting portion 1441, the third connecting portion 1443 and the second connecting portion 1442, which are located at three different positions of the first limiting portion 112. For example, the first connecting portion 1441 and the second connecting portion 1442 are located at two sides of the first limiting portion 112 in the thickness direction Z of the end cover 13 respectively, and the third connecting portion 1443 is located at the inner circumferential side of the first limiting portion 112.

[0152] For example, the hanging buckle portion 144 can be formed by bending a sheet connected to the body portion 141 to sequentially connect the first connecting portion 1441, the third connecting portion 1443 and the second connecting portion 1442.

[0153] In the present embodiment, the first connecting portion 1441, the third connecting portion 1443 and the second connecting portion 1442 are sequentially connected and form the limiting groove 1444 for accommodating the first limiting portion 112. Such a hanging buckle portion 144 has a simple structure and is easy to form.

[0154] In some embodiments, please refer to Figure 9 , Figure 9 A partial view of the battery monomer 10 provided in some embodiments of the present application, the battery monomer 10 further comprises a conductive layer 18 for connecting the first limiting portion 112 and the third connecting portion 1443.

[0155] The conductive layer 18 is a component for electrically connecting the first limiting portion 112 and the third connecting portion 1443. The conductive layer 18 can be a conductor such as conductive glue, conductive metal, etc.

[0156] After the hanging portion 144 is hung on the first limiting portion 112, the first connecting portion 1441 and the second connecting portion 1442 of the hanging portion 144 abut against the first limiting portion 112 to maintain good contact with the first limiting portion 112, but the third connecting portion 1443 can have a gap with the first limiting portion 112, so that the third connecting portion 1443 does not contact the first limiting portion 112.

[0157] Therefore, by arranging the conductive layer 18 between the first limiting portion 112 and the third connecting portion 1443, the electrical connection between the first limiting portion 112 and the third connecting portion 1443 is achieved, and the flow area between the current collecting member 14 and the shell 11 is further increased.

[0158] In some embodiments, please continue to refer to Figure 5 , Figure 6 , Figure 8 and Figure 9 , the first limiting portion 112 is an annular structure extending along the circumference of the shell 11.

[0159] In the case where the first limiting portion 112 is an annular structure extending along the circumference of the shell 11, the shell 11 can be a cylindrical structure. The first limiting portion 112 is an annular structure, which is easy to form and manufacture, and the first limiting portion 112 can limit the end cover 13 around the whole circumference, thereby ensuring the limiting ability of the first limiting portion 112 to the end cover 13 and the current collecting member 14.

[0160] In some embodiments, the outer side surface 113 of the shell 11 is provided with a roller groove 114 at a position corresponding to the first limiting portion 112.

[0161] The outer side surface 113 of the shell 11 refers to the outer side surface of the side wall of the shell 11 extending along the thickness direction Z of the end cover 13. It can be understood that the outer side surface 113 extends substantially along the thickness direction Z of the end cover 13.

[0162] In the process of forming the roller groove 114, the shell 11 will form the first limiting portion 112 at the position corresponding to the roller groove 114, thereby limiting the current collecting member 14 and the electrode assembly 12 in the shell 11. The first limiting portion 112 is simple to form, so that the assembly of the battery monomer 10 is simpler and has good economy.

[0163] In some embodiments, the shell 11 has a second limiting portion 115, and at least a portion of the end cover 13 is located between the first limiting portion 112 and the second limiting portion 115 in the thickness direction Z of the end cover 13, and the first limiting portion 112 and the second limiting portion 115 are used to jointly limit the movement of the end cover 13 in the thickness direction Z of the end cover 13.

[0164] The second limiting portion 115 and the first limiting portion 112 both limit the end cover 13, the second limiting portion 115 limits the movement of the end cover 13 away from the electrode assembly 12, and the first limiting portion 112 limits the movement of the end cover 13 towards the electrode assembly 12. The second limiting portion 115 and the first limiting portion 112 cooperatively limit the end cover 13 at the end of the shell 11 having the opening.

[0165] For example, the second limiting portion 115 can be a folded edge structure of the shell 11 folded inwardly in part. The second limiting portion 115 can be formed by folding the shell 11. In the process of assembling the battery cell 10, the electrode assembly 12 and the current collecting member 14 can be accommodated in the shell 11, the first limiting portion 112 can be formed by processing the roll groove 114 of the shell 11, the end cover 13 can be abutted against the first limiting portion 112, and finally the second limiting portion 115 can be formed by folding the shell 11 to fix the end cover 13 and the shell 11.

[0166] In the present embodiment, the second limiting portion 115 and the first limiting portion 112 jointly limit the movement of the end cover 13 in the thickness direction Z of the end cover 13, so that the end cover 13 cannot move relative to the shell 11, and the firmness of the end cover 13 after being connected with the shell 11 is ensured.

[0167] In some embodiments, the battery cell 10 further comprises a sealing member 15 for sealing the end cover 13 and the shell 11, and the sealing member 15 is located on the side of the first limiting portion 112 away from the electrode assembly 12.

[0168] The sealing member 15 is a component for sealingly connecting the end cover 13 and the shell 11. The sealing member 15 can be made of rubber, plastic or the like.

[0169] For example, the sealing member 15 is wrapped around the outer periphery of the end cover 13, and the sealing member 15 is located between the end cover 13 and the first limiting portion 112 in part, and the sealing member 15 is located between the end cover 13 and the second limiting portion 115 in part.

[0170] The sealing member 15 is used to achieve the sealing connection between the end cover 13 and the shell 11, so as to ensure the sealing performance of the end cover 13 and the shell 11. The sealing member 15 is located on the side of the first limiting portion 112 away from the electrode assembly 12, and the arrangement of the sealing member 15 is not easily affected by the current collecting member 14, thereby improving the sealing performance between the end cover 13 and the shell 11.

[0171] The embodiment of the present application provides a battery 100, comprising a plurality of battery monomers 10 provided by any one of the above embodiments.

[0172] The embodiment of the present application provides a power consuming device, comprising the battery 100 provided by any one of the above embodiments.

[0173] The power consuming device can be any one of the devices using the battery 100.

[0174] In addition, please refer to Figure 5 The embodiment of the present application further provides a cylindrical monomer, comprising a shell 11, an electrode assembly 12, an end cover 13 and a current collecting member 14. The shell 11 is electrically connected with the tab 122 of the electrode assembly 12 through the current collecting member 14. The inner side surface 111 of the shell 11 is provided with a first limiting portion 112 for limiting the movement of the end cover 13 to the direction of the electrode assembly 12. The current collecting member 14 comprises a body portion 141 and an elastic portion 142, the body portion 141 is connected to the tab 122 of the electrode assembly 12, the body portion 141 is located on the side of the first limiting portion 112 facing the electrode assembly 12, the elastic portion 142 is connected to the body portion 141, and the elastic portion 142 abuts against the first limiting portion 112 in the direction away from the electrode assembly 12. The elastic portion 142 can always keep the abutting state with the first limiting portion 112, and the electrical connection between the current collecting member 14 and the shell 11 and the electrical connection between the current collecting member 14 and the electrode assembly 12 can be ensured not to be easily failed even in a vibrating environment.

[0175] The embodiment of the present application provides a manufacturing method of the battery monomer 10, please refer to Figure 10 , Figure 10 The flow chart of the manufacturing method of the battery monomer 10 provided by some embodiments of the present application is shown in the figure, and the manufacturing method comprises the following steps. S100: providing a shell 11, the shell 11 has an opening; S200: providing an electrode assembly 12 with a tab 122; S300: providing an end cover 13; S400: providing a current collecting member 14; S500: connecting the current collecting member 14 to the tab 122 of the electrode assembly 12; S600: accommodating the electrode assembly 12 and the current collecting member 14 in the shell 11; S700: performing roll groove 114 processing on the shell 11, so that the part of the shell 11 corresponding to the roll groove 114 is formed as the first limiting portion 112 protruding from the inner side surface 111 of the shell 11; S800: covering the end cover 13 on the opening, and sealingly connecting the end cover 13 with the shell 11.

[0176] The first limiting part 112 is used to limit the movement of the end cover 13 towards the electrode assembly 12. The current collecting member 14 is located on the side of the electrode assembly 12 facing the end cover 13, and the current collecting member 14 abuts against the side of the first limiting part 112 facing the electrode assembly 12.

[0177] In the above method, the order of steps S100, S200, S300 and S400 is not limited, for example, step S400 can be performed first, then step S300, then step S200, and then step S100.

[0178] In some embodiments, referring to Figure 11 , Figure 11 The schematic diagram provided by some embodiments of the present application for processing the roll groove 114 of the shell 11. The current collecting member 14 includes a body part 141 and an elastic part 142. The body part 141 is connected to the tab 122, and the elastic part 142 is connected to the body part 141. During the processing of the roll groove 114 of the shell 11, the part of the shell 11 forming the roll groove 114 extrudes the elastic part 142, so that the elastic part 142 is bent relative to the body part 141, so that the elastic part 142 abuts against the first limiting part 112 in a direction away from the electrode assembly 12.

[0179] Figure 11 The direction indicated by the arrow in the figure is the direction of deformation of the shell 11 after being extruded during the processing of the roll groove 114.

[0180] During the processing of the roll groove 114 of the shell 11, the part of the shell 11 forming the roll groove 114 extrudes the elastic part 142 of the current collecting member 14, so that the elastic part 142 is bent relative to the body part 141 and elastically abuts against the first limiting part 112. That is, after the processing of the roll groove 114 of the shell 11, the elastic part 142 of the current collecting member 14 naturally and elastically abuts against the first limiting part 112, improving the assembly efficiency of the battery monomer 10.

[0181] It should be noted that in the embodiment in which the current collecting member 14 includes the body part 141 and the hanging part 144, the part of the shell 11 forming the roll groove 114 during the processing of the roll groove 114 can also extrude the sheet-shaped part connected to the body part 141, so that the sheet-shaped part is bent and deformed to form the hanging part 144 hanging on the first limiting part 112.

[0182] In some embodiments, referring to Figure 12 , Figure 12 The schematic diagram provided by some embodiments of the present application for processing the roll groove 114 of the shell 11. The current collecting member 14 includes a body part 141 and an elastic part 142. The body part 141 is connected to the tab 122, and the elastic part 142 is connected to the body part 141. During the processing of the roll groove 114 of the shell 11, the part of the shell 11 forming the roll groove 114 extrudes the elastic part 142, so that the elastic part 142 is bent relative to the body part 141, so that the elastic part 142 abuts against the first limiting part 112 in a direction away from the electrode assembly 12. The shell 11 is subjected to a flanging process, so that the shell 11 forms a second limiting portion 115 to jointly limit the movement of the end cover 13 in the thickness direction Z of the end cover 13.

[0183] Figure 12 The direction indicated by the arrow in the figure is the force direction of the shell 11 during the flanging process of the shell 11.

[0184] The second limiting portion 115 that limits the end cover 13 is formed by the flanging process of the shell 11, and the forming method of the second limiting portion 115 is simple and efficient.

[0185] It should be noted that the related structure of the battery monomer 10 manufactured by the manufacturing method provided in the above embodiments can refer to the battery monomer 10 provided in the above embodiments, which will not be described here.

[0186] The application provides a manufacturing equipment 2000 for the battery monomer 10, which will be described below. Figure 13 , Figure 13 The manufacturing equipment 2000 for the battery monomer 10 provided in some embodiments of the application is shown in the structure diagram, which includes a first providing device 2100, a second providing device 2200, a third providing device 2300, a fourth providing device 2400, and an assembling device 2500.

[0187] The first providing device 2100 is used to provide the shell 11, and the shell 11 has an opening. The second providing device 2200 is used to provide the electrode assembly 12, which has a tab 122. The third providing device 2300 is used to provide the end cover 13. The fourth providing device 2400 is used to provide the current collecting member 14. The assembling device 2500 is used to connect the current collecting member 14 to the tab 122; the assembling device 2500 is also used to accommodate the electrode assembly 12 and the current collecting member 14 in the shell 11; the assembling device 2500 is also used to process the roll groove 114 of the shell 11, so that the part of the shell 11 corresponding to the roll groove 114 forms the first limiting portion 112 protruding from the inner side surface 111 of the shell 11; and the assembling device 2500 is also used to cover the end cover 13 on the opening and seal the connection between the end cover 13 and the shell 11.

[0188] The first limiting portion 112 is used to limit the movement of the end cover 13 in the direction close to the electrode assembly 12, and the current collecting member 14 is located on the side of the electrode assembly 12 facing the end cover 13, and the current collecting member 14 abuts against the side of the first limiting portion 112 facing the electrode assembly 12.

[0189] It should be noted that the related structure of the battery monomer 10 manufactured by the manufacturing equipment 2000 provided in the above embodiments can refer to the battery monomer 10 provided in the above embodiments, which will not be described here.

[0190] It should be noted that the embodiments and features of the embodiments in the present application can be combined with each other in the case of no conflict.

[0191] The above embodiments are only used to illustrate the technical solutions of the present application, and are not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. 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 by, The battery monomer comprises: an electrode assembly having a tab, the electrode assembly being a winding structure; a shell having an opening, the shell being used for accommodating the electrode assembly; an end cover used for covering the opening and being sealingly connected with the shell; a current collecting member accommodated in the shell and located at a side of the electrode assembly facing the end cover, the current collecting member being used for connecting the tab and the shell to realize electrical connection between the tab and the shell; wherein an inner side of the shell is provided with a first limiting portion, the first limiting portion being used for limiting movement of the end cover towards the electrode assembly, and the current collecting member abutting against a side of the first limiting portion facing the electrode assembly; the current collecting member comprises a body portion and an elastic portion, the body portion being located at the side of the first limiting portion facing the electrode assembly and being used for connecting the tab, and the elastic portion being connected with the body portion and being used for abutting against the first limiting portion in a direction away from the electrode assembly; the shell has a second limiting portion, at least a part of the end cover is located between the first limiting portion and the second limiting portion in a thickness direction of the end cover, and the first limiting portion and the second limiting portion are used for jointly limiting movement of the end cover in the thickness direction of the end cover; an electrode terminal is arranged at an end of the shell away from the end cover, the electrode terminal is insulatingly connected with the shell, the tab comprises a positive tab and a negative tab, one of the positive tab and the negative tab is electrically connected with the shell, and the other is electrically connected with the electrode terminal.

2. The battery cell of claim 1, wherein, The elastic portion is a spring plate arranged in the body portion in a bending manner.

3. The battery cell of claim 1, wherein, The elastic portion comprises: a first bending portion used for abutting against the first limiting portion; a second bending portion used for connecting the first bending portion and the body portion; wherein, in the thickness direction of the end cover, a part of the body portion opposite to the first bending portion is arranged in a gap with the first bending portion.

4. The battery cell of claim 3, wherein, The battery monomer further comprises an elastic layer supported between the body portion and the first bending portion.

5. The battery cell of claim 3, wherein, The second bending portion is connected with an edge of the body portion, and the first bending portion is arranged in a bending manner relative to the second bending portion towards the body portion.

6. The battery cell of claim 1, wherein, The body portion has an outer surface facing the end cover, and the outer surface is provided with a first accommodating portion used for accommodating at least a part of the elastic portion.

7. The battery cell of claim 6, wherein, The elastic portion has an abutting surface facing the end cover, the abutting surface is used for abutting against the first limiting portion, and the abutting surface is flush with the outer surface.

8. The battery cell of claim 6, wherein, The region of the body portion provided with the first accommodating portion is provided with a through hole.

9. The battery cell of claim 1, wherein, The body portion is provided with a plurality of elastic portions distributed in a circumferential direction of the body portion in a spaced manner.

10. The battery cell of claim 9, wherein, The body portion has a plurality of welding zones distributed in a circumferential direction of the body portion in a spaced manner, the welding zones are used for welding with the tab, and at least one elastic portion is arranged between two adjacent welding zones in the circumferential direction of the body portion.

11. The battery cell of claim 10, wherein, The body portion has an inner surface away from the end cover, and the inner surface is provided with a second accommodating portion located at the welding zone, the second accommodating portion being used for accommodating at least a part of the tab.

12. The battery cell of claim 1, wherein, The current collecting member comprises: A hanging buckle portion connected to the body portion, the hanging buckle portion being configured to be hung and buckled with the first limiting portion to limit movement of the body portion towards or away from the end cover.

13. The battery cell of claim 12, wherein, The hanging buckle portion comprises: A first connecting portion connected to the body portion, the first connecting portion being configured to abut against one side of the electrode assembly facing the first limiting portion; A second connecting portion configured to abut against the other side of the first limiting portion away from the electrode assembly; A third connecting portion configured to connect the first connecting portion and the second connecting portion.

14. The battery cell of claim 13, wherein, The first connecting portion, the third connecting portion and the second connecting portion are sequentially connected and jointly define a limiting groove configured to accommodate at least a portion of the first limiting portion.

15. The battery cell of claim 14, wherein, The battery monomer further comprises: An electrically conductive layer configured to connect the first limiting portion and the third connecting portion.

16. The battery cell of any one of claims 1-15, wherein, The first limiting portion is an annular structure extending circumferentially along the shell.

17. The battery cell of any one of claims 1-15, wherein, An outer side surface of the shell is provided with a roller groove at a position corresponding to the first limiting portion.

18. The battery cell of any one of claims 1-15, wherein, The battery monomer further comprises: A sealing member configured to seal the end cover and the shell, the sealing member being located at the other side of the first limiting portion away from the electrode assembly.

19. The battery cell of any one of claims 1-15, wherein, In the axial direction of the electrode assembly, an outer surface of the end cover away from the electrode assembly is arranged closer to the electrode assembly than an outer surface of the second limiting portion away from the electrode assembly.

20. A battery, characterized by A plurality of battery monomers according to any one of claims 1-19.

21. An electrical device, comprising: A battery according to claim 20.

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