Battery cell, battery device, electrical device, and stamping method

Abstract

A battery cell, a battery device, an electrical device, and a stamping method, relating to the technical field of batteries. A casing (2) is provided with at least one first boss (21) protruding from the casing (2) in a direction away from an electrode assembly (1) and a recess (23) corresponding to each first boss (21); the recess (23) is located on the side of the casing (2) facing the electrode assembly (1); the first boss (21) and the electrode assembly (1) are arranged in a first direction; a first sub-hole (231) is located on the side of a second sub-hole (232) facing the electrode assembly (1) in the first direction, and the second sub-hole (232) is partially formed in the first boss (21); in a projection along the first direction, the projected area of the second sub-hole (232) is at least partially located within the projected area of the first sub-hole (231); and a conductive assembly (3) is at least partially electrically connected to the electrode assembly (1), there is at least one conductive assembly (3), and each conductive assembly (3) is respectively in limiting contact with the at least one first boss (21). The first sub-hole (231) reduces resistance to stamping deformation of the casing (2), thereby allowing the first boss (21) to be stamped to a higher height, such that the first boss (21) can better limit the conductive assembly (3).

Description

Battery monomer, battery device, power utilization device and stamping method TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device, a power utilization device and a stamping method. BACKGROUND

[0002] Batteries are increasingly widely used in life and industry. For example, new energy vehicles equipped with batteries have been widely used.

[0003] In new energy vehicles equipped with batteries, the batteries can be used to provide power in whole or in part. In the related art, the conductive components of the battery monomer can rotate.

[0004] SUMMARY

[0005] Therefore, embodiments of the present application aim to provide a battery monomer, a battery device, a power utilization device and a stamping method to limit the rotation of the conductive components.

[0006] A first aspect of an embodiment of the present application provides a battery monomer, comprising:

[0007] an electrode assembly;

[0008] a housing having at least one first boss protruding in a direction away from the electrode assembly and a counterbore corresponding to each first boss, the electrode assembly being located in the housing, the counterbore being located on a side of the housing facing the electrode assembly, the first boss and the electrode assembly being arranged in a first direction, the counterbore having a first sub-hole and a second sub-hole in communication with each other, the first sub-hole being located on a side of the second sub-hole facing the electrode assembly in the first direction, the second sub-hole being partially formed in the first boss, and the projection area of the second sub-hole being at least partially located in the projection area of the first sub-hole in the first direction;

[0009] a conductive component at least partially electrically connected to the electrode assembly, the number of conductive components being at least one, and each conductive component being in limiting contact with at least one first boss.

[0010] In an embodiment of the present application, at least part of the material around the first boss is pushed to the side away from the electrode assembly through the first sub-hole, reducing the resistance of the stamping deformation of the housing, which is conducive to the stamping die partially extending into the second sub-hole to stamp the first boss to a higher height, so that the first boss can better limit the conductive component.

[0011] In an embodiment, the projection area of the first boss is located in the projection area of the first sub-hole in the first direction.

[0012] In the embodiments of the present application, the material around the first boss is extruded in the direction in which the first boss protrudes by the first sub-hole, which is beneficial to reduce the resistance of the stamping die in the second sub-hole to stamp out the first boss, so that the first boss can be stamped out to a higher height.

[0013] In an embodiment, the hole wall surface of the second sub-hole comprises a first surface and a second surface connected to each other, the second surface surrounds the first surface, and the included angle between the first surface and the second surface ranges from 95° to 120°.

[0014] In the embodiments of the present application, the degree of stretching of the hole wall of the second sub-hole in the stamping process is reduced, and the resistance of the stamping die in the second sub-hole to stamp out the first boss is reduced, which is beneficial to reduce the stamping difficulty.

[0015] In an embodiment, the shell comprises:

[0016] a shell;

[0017] an end cover connected to the shell, the electrode assembly is located in a space surrounded by the shell and the end cover, the first boss is formed on the end cover, the first boss protrudes in a direction away from the electrode assembly of the end cover, and the counterbore is located on a side of the end cover facing the electrode assembly.

[0018] In the embodiments of the present application, the first boss is formed on the end cover, and the resistance of the end cover to stamping deformation is reduced by setting the first sub-hole and the second sub-hole, so that the first boss can be stamped out to a higher height on the end cover, and the rotation of the conductive assembly is limited.

[0019] In an embodiment, the ratio of the depth of the first sub-hole to the thickness of the end cover is a first ratio, and the range of the first ratio is 0.2-0.5.

[0020] In the embodiments of the present application, the structural strength of the end cover at the first boss can be ensured to basically meet the requirements, and the first boss can be stamped out to a suitable height.

[0021] In an embodiment, the minimum distance between the hole wall surface of the second sub-hole and the outer surface of the first boss is a preset distance, the ratio of the preset distance to the thickness of the end cover is a second ratio, and the range of the second ratio is 0.35-0.8.

[0022] In the embodiments of the present application, the strength of the first boss at the corner is basically met, and the first boss can be stamped out to a more suitable height.

[0023] In an embodiment, a recess is formed on a side of the end cover away from the electrode assembly, and the recess and the first protrusion enclose a sink around the first protrusion, and the sink is open away from the electrode assembly.

[0024] In the embodiments, the side of the first protrusion along the first direction is as close to parallel to the first direction as possible, which reduces the possibility of the conductive assembly slipping off the first protrusion, and enables the first protrusion to better limit the conductive assembly.

[0025] In an embodiment, a ratio of a depth of the sink to a thickness of the end cover is a third ratio, and the third ratio ranges from 0.02 to 0.1.

[0026] In the embodiments, the side of the first protrusion along the first direction is as close to parallel to the first direction as possible on the premise that the structural strength of the end cover basically meets the requirements.

[0027] In an embodiment, the sink is circular.

[0028] In the embodiments, the circular sink is convenient to process on the shell, and the transition of the wall of the sink is relatively smooth, which is conducive to reducing stress concentration.

[0029] In an embodiment, a size of the first protrusion protruding from the end cover along the thickness direction of the end cover is a first size, a ratio of the first size to the thickness of the end cover is a fourth ratio, and the fourth ratio ranges from 0.8 to 1.5.

[0030] In the embodiments, the possibility of the first protrusion separating from the conductive assembly is reduced, which is conducive to limiting the rotation of the conductive assembly, and the height of the first size is appropriate, which is conducive to processing the first protrusion.

[0031] In an embodiment, the material of the end cover is steel.

[0032] In the embodiments, the degree to which the strength of the end cover is reduced by processing the first protrusion on the end cover is reduced, and the structural strength of the end cover is improved.

[0033] In an embodiment, the conductive assembly includes:

[0034] An insulating member is located on a side of the shell away from the electrode assembly, and the insulating member has a clearance hole and at least one second protrusion, each of the second protrusions is sleeved on a corresponding first protrusion.

[0035] A conductive terminal penetrates the clearance hole, and the conductive terminal is electrically connected to the electrode assembly, each of the conductive terminals is sleeved on a corresponding second protrusion, and the insulating member is at least partially located between the conductive terminal and the shell.

[0036] In the embodiments of the present application, the connection between the conductive terminal and the insulating member can be strengthened, the insulating member is beneficial to limit the movement of the conductive terminal relative to the first protrusion, and the insulating member can also insulate the conductive terminal.

[0037] In an embodiment, the conductive terminal comprises:

[0038] A first conductive member penetrating through the avoiding hole, the first conductive member being electrically connected with the electrode assembly;

[0039] A second conductive member connected with the first conductive member, the second conductive member being located on the side of the shell away from the electrode assembly, the second conductive member being sleeved on the second protrusion, and the insulating member being at least partially located between the second conductive member and the shell.

[0040] In the embodiments of the present application, the movement of the conductive terminal is limited by the cooperation of the second conductive member, the first conductive member and the insulating member.

[0041] In an embodiment, the number of the first protrusions is at least two, and each of the conductive assemblies is in position-limiting contact with at least two of the first protrusions.

[0042] In the embodiments of the present application, the conductive assembly is limited at at least two different positions, which is beneficial to limit the rotation of the conductive assembly.

[0043] The second aspect of the embodiments of the present application provides a battery device, comprising:

[0044] A box body;

[0045] According to the battery monomer of any one of the above, the battery monomer is installed in the box body.

[0046] In the embodiments of the present application, at least part of the material around the first protrusion is pushed to the side away from the electrode assembly through the first sub-hole, which reduces the resistance of the stamping deformation of the shell, and is beneficial to the stamping die partially extending into the second sub-hole to stamp the first protrusion to a higher height, so that the first protrusion can better limit the conductive assembly.

[0047] The third aspect of the embodiments of the present application provides a power utilization device, comprising:

[0048] A device body;

[0049] According to the battery device of the above, the battery device is installed in the device body.

[0050] In the embodiment of the present application, at least part of the material around the first boss is pushed to the side away from the electrode assembly through the first sub-hole, which reduces the resistance of the shell stamping deformation, and is beneficial to the stamping die partially extending into the second sub-hole to stamp the first boss to a higher height, so that the first boss can better limit the conductive assembly.

[0051] The fourth aspect of the embodiment of the present application provides a stamping method, comprising the following steps:

[0052] The shell is arranged between the first stamping die and the second stamping die, the first stamping die is formed with a cavity for avoiding the first boss, the second stamping die is formed with a first pressure head, the first pressure head comprises a first sub-pressure head and a second sub-pressure head connected with each other, the projection area of the second sub-pressure head is located in the projection area of the first sub-pressure head along the arrangement direction of the first sub-pressure head and the second sub-pressure head, the first sub-pressure head is used for stamping out the first sub-hole, and the second sub-pressure head is used for stamping out the second sub-hole and the first boss.

[0053] At least one of the first stamping die and the second stamping die is driven to move to the other one to stamp the shell between the first stamping die and the second stamping die.

[0054] In the embodiment of the present application, it is convenient to stamp the first sub-hole, the second sub-hole and the first boss on the shell

[0055] In an embodiment, the first stamping die is further formed with a second pressure head, and the second pressure head is used for stamping out the groove.

[0056] In the embodiment of the present application, the second pressure head is convenient to stamp the groove on the side of the shell away from the second sub-hole. Beneficial effects

[0057] The battery monomer, the battery device, the power consumption device and the stamping method provided by the embodiment of the present application, at least part of the material around the first boss is pushed to the side away from the electrode assembly through the first sub-hole, in the process that the stamping die extrudes part of the material of the shell wall along the protruding direction of the first boss, the tensile deformation of the material at the second sub-hole is reduced, the resistance of the shell stamping deformation is reduced, which is beneficial to the stamping die partially extending into the second sub-hole to stamp the first boss to a higher height, so that the first boss can better limit the conductive assembly. BRIEF DESCRIPTION OF DRAWINGS

[0058] FIG. 1 is an exploded view of the battery monomer of the embodiment of the present application;

[0059] FIG. 2 is an enlarged view of A in FIG. 1;

[0060] Fig. 3 is a structural schematic diagram of an end cover of a battery cell according to an embodiment of the present application;

[0061] Fig. 4 is a sectional view taken along line B-B of Fig. 3;

[0062] Fig. 5 is an enlarged view of portion C of Fig. 4;

[0063] Fig. 6 is a structural schematic diagram of an electrically-conductive assembly of a battery cell according to an embodiment of the present application, showing an end cover;

[0064] Fig. 7 is a sectional view taken along line D-D of Fig. 6;

[0065] Fig. 8 is an enlarged view of portion E of Fig. 7.

[0066] Explanation of Reference Numerals

[0067] 1, electrode assembly; 2, outer shell; 21, first boss; 22, recess; 23, counterbore; 231, first sub-hole; 232, second sub-hole; 233, first surface; 234, second surface; 24, sink groove; 25, housing; 26, end cover; 3, electrically-conductive assembly; 31, insulating member; 311, second boss; 312, relief hole; 32, electrically-conductive terminal; 321, first electrically-conductive member; 322, second electrically-conductive member. DETAILED DESCRIPTION

[0068] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0069] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used herein are only for the purpose of describing specific embodiments of the present application, and are not intended to limit the present application; the terms "comprise" and "have" and any variations thereof in the embodiments of the present application are intended to cover non-exclusive inclusion.

[0070] In the description of the embodiments of the present application, the technical terms "first", "second", "third" and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0071] Reference to“an embodiment” herein 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 all directed to the same embodiment, or to a single alternative embodiment. One of ordinary skill in the art will readily recognize from the disclosure herein a wide number of variations, alternatives, and equivalents in the application that fall within the scope of the application. Those skilled in the art will readily recognize from the disclosure herein, extensive modifications within the scope of the application that would be or are equivalents of what is described herein.

[0072] In the description of the embodiments of the application, the term“and / or” is merely used to describe associated objects, and can represent the three conditions of A and / or B, that is, A alone, both A and B, and B alone. In addition, the character“ / ” in the present application generally indicates that the preceding or following associated objects are in an“or” relationship.

[0073] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical terms“mounting”,“connecting”,“connecting”,“fixing” and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the application can be understood according to the specific circumstances.

[0074] In the description of the embodiments of the application, unless otherwise explicitly specified and limited, the technical term“contact” should be understood in a broad sense, which can be direct contact or contact through an intermediate medium layer, and can be contact between two objects in contact without interaction force, or contact between two objects in contact with interaction force.

[0075] In the related art, the electrode assembly in the battery monomer is located in the shell, the conductive assembly is connected with the electrode assembly, the conductive assembly is mounted on the shell, the first boss is arranged on the shell, and the first boss abuts against the conductive assembly to limit the rotation of the conductive assembly. The resistance of the stamping deformation of the shell is large, and the protruding height of the first boss formed by stamping on the shell is difficult to meet the anti-torsion requirement of the conductive assembly, and the first boss abutting against the conductive assembly may slip off.

[0076] The battery cell of the embodiment of the application comprises an electrode assembly 1, a shell 2, and a conductive assembly 3. The shell 2 has at least one first boss 21 and a counterbore 23 corresponding to each first boss 21. The counterbore 23 has a first sub-hole 231 and a second sub-hole 232 that are in communication with each other. The projection area of the second sub-hole 232 is at least partially located within the projection area of the first sub-hole 231 in the first direction. Each conductive assembly 3 is in limiting contact with at least one first boss 21. The first sub-hole 231 allows the first boss 21 to have a higher protruding height to limit the rotation of the conductive assembly 3.

[0077] The battery cell of the embodiment of the application can be applied to a battery device, and the battery device can be applied to an electric device.

[0078] The embodiment of the application provides a battery device, which comprises a box body and a battery cell.

[0079] The battery device can be a battery pack or an energy storage device.

[0080] The battery pack can comprise at least two battery cells, and the at least two battery cells can be connected in series, in parallel, or in a mixed manner. The mixed manner means that the at least two battery cells are connected in series and in parallel. The at least two battery cells can be directly connected in series, in parallel, or in a mixed manner, and then the whole of the at least two battery cells is placed in the box body. The battery device can further comprise other structures, for example, the battery device can further comprise a current collecting component for realizing the electrical connection between the at least two battery cells.

[0081] The energy storage device is a device for storing electric energy, for example, an energy storage cabinet or an energy storage container. The battery device of the embodiment of the application is suitable for an electric device.

[0082] The embodiment of the application provides an electric device, which comprises a device main body and a battery device.

[0083] The electric device is a device that uses electric energy as energy and realizes corresponding functions by consuming electric energy. Exemplarily, the electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, a ship, a spacecraft, etc. The electric toy can include fixed or mobile electric toys, for example, a game console, an electric car toy, an electric ship toy, and an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0084] The device body refers to the main structure that consumes electric energy to realize corresponding functions. For example, the electric device can be a mobile phone, and the device body is the part that can realize communication functions, and the battery monomer or battery device supplies power to the part that can realize communication functions. For example, the electric device can be a car, and the device body is the part that can provide people with seats and can drive on the road, and the battery monomer or battery device supplies power to the part that can provide people with seats and can drive on the road.

[0085] Taking the electric device of an embodiment of the present application as a vehicle and the battery device as a battery pack as an example for description.

[0086] The vehicle provided by an embodiment of the present application can be a fuel car, a gas car, or a new energy car, and the new energy car can be a pure electric car, a hybrid car, or a range extended car. The vehicle is internally provided with a battery pack, which can be arranged at the bottom, head, or tail of the vehicle. The battery pack can be used for power supply of the vehicle, for example, the battery pack can be used as the operating power supply of the vehicle. The vehicle can further include a controller and a motor, and the controller can be used to control the battery pack to supply power to the motor. For example, the battery pack can be used for the working power demand of the vehicle during starting, navigation, and driving.

[0087] In some embodiments of the present application, the battery pack can not only be used as the operating power supply of the vehicle, but also be used as the driving power supply of the vehicle, to replace or partially replace fuel or natural gas to provide driving power for the vehicle.

[0088] An embodiment of the present application provides a battery monomer, please refer to FIG. 1-8, the battery monomer includes an electrode assembly 1, a shell 2 and a conductive assembly 3, the shell 2 has at least one first boss 21 protruding in the direction of the shell 2 away from the electrode assembly 1 and the counterbore 23 corresponding to each first boss 21, the electrode assembly 1 is located in the shell 2, the counterbore 23 is located on the side of the shell 2 towards the electrode assembly 1, the first boss 21 and the arrangement direction of the electrode assembly 1 are the first direction, the counterbore 23 has the first sub-hole 231 and the second sub-hole 232 that are communicated with each other, the first sub-hole 231 is located on the side of the second sub-hole 232 towards the electrode assembly 1 along the first direction, the second sub-hole 232 is partially formed in the first boss 21, and the projection area of the second sub-hole 232 is at least partially located in the projection area of the first sub-hole 231 along the first direction, the conductive assembly 3 is at least partially electrically connected with the electrode assembly 1, the number of the conductive assembly 3 is at least one, and each conductive assembly 3 is in limiting contact with at least one first boss 21.

[0089] The shell 2 can be a sealed structure or a non-sealed structure. When the shell 2 is a non-sealed structure, the shell 2 serves to protect the motor assembly, and a sealing bag is further included between the shell 2 and the electrode assembly 1, which is used to encapsulate the electrode assembly 1 and the electrolyte. Specifically, the sealing bag can be a bag-shaped insulating piece 31 or an aluminum plastic film.

[0090] The electrode assembly 1 can be a wound structure or a stacked structure.

[0091] The battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging.

[0092] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel-hydrogen battery, a nickel-cadmium battery, a lead-acid battery, etc., and the present application is not limited thereto.

[0093] For ease of illustration, the first direction is indicated by the arrow of R1.

[0094] The conductive assembly 3 is an electrode post.

[0095] The first boss 21 and the counterbore 23 are stamped and formed.

[0096] In the present application, at least part of the material around the first boss 21 is pushed to the side away from the electrode assembly 1 through the first sub-hole 231. In the process of extruding part of the shell wall of the shell 2 in the protruding direction of the first boss 21, the tensile deformation of the material at the second sub-hole 232 is reduced, which reduces the resistance of the stamping deformation of the shell 2, and is beneficial to the stamping die partially extending into the second sub-hole 232 to stamp the first boss 21 to a higher height, so that the first boss 21 can better limit the conductive assembly 3.

[0097] In an embodiment, referring to FIG. 5, the projection area of the first boss 21 is located within the projection area of the first sub-hole 231 in the first direction.

[0098] In the present application, the material around the first boss 21 is extruded in the protruding direction of the first boss 21 through the first sub-hole 231, which is beneficial to reduce the resistance of the stamping die to stamp the first boss 21 in the second sub-hole 232, so that the first boss 21 is stamped to a higher height.

[0099] It can be understood that the projection area of the first boss 21 is not limited to being located within the projection area of the first sub-hole 231 in the thickness direction of the end cover 26. For example, the projection area of the first boss 21 is partially located outside the projection area of the first sub-hole 231.

[0100] In an embodiment, referring to FIG. 5, the hole wall surface of the second sub-hole 232 comprises a first surface 233 and a second surface 234 connected to each other, the second surface 234 surrounds the first surface 233, and the included angle between the first surface 233 and the second surface 234 ranges from 95° to 120°.

[0101] The included angle between the first surface 233 and the second surface 234 is taken as a reference plane coinciding with the central axis of the first boss 21, the intersection line between the reference plane and the first surface 233 is a first reference line, the intersection line between the reference plane and the second surface 234 is a second reference line, and the included angle between the first reference line and the second reference line is the included angle between the first surface 233 and the second surface 234.

[0102] The included angle between the first surface 233 and the second surface 234 is shown as TH1 in the figure.

[0103] Exemplarily, the second surface 234 is arc-shaped close to one side of the electrode assembly 1.

[0104] Exemplarily, the included angle between the first surface 233 and the second surface 234 is 95°, 100°, 110° or 120°.

[0105] In the embodiment of the present application, the included angle of the hole wall surface of the second sub-hole 232 ranges from 95° to 120°, which can reduce the stretching degree of the hole wall of the second sub-hole 232 in the stamping process, reduce the resistance of the stamping die to stamp out the first boss 21 in the second sub-hole 232, and is conducive to reducing the stamping difficulty.

[0106] It can be understood that the included angle between the first surface 233 and the second surface 234 is not limited to range from 95° to 120°. Exemplarily, the included angle between the first surface 233 and the second surface 234 is 125°.

[0107] In an embodiment, referring to FIGS. 1, 4 and 5, the shell 2 comprises a shell body 25 and an end cover 26, the end cover 26 is connected to the shell body 25, the electrode assembly 1 is located in the space surrounded by the shell body 25 and the end cover 26, the first boss 21 is formed on the end cover 26, the first boss 21 protrudes away from the electrode assembly 1 along the end cover 26, and the counterbore 23 is located on the side of the end cover 26 facing the electrode assembly 1.

[0108] Exemplarily, the end cover 26 is stamped and formed.

[0109] In the embodiment of the present application, the first boss 21 is formed on the end cover 26, the conductive assembly 3 is in position-limiting contact with the first boss 21, the conductive assembly 3 is installed on the end cover 26, the first sub-hole 231 and the second sub-hole 232 are arranged to reduce the resistance of the end cover 26 to stamping deformation, so that the first boss 21 can be stamped to a higher height on the end cover 26, and the rotation of the conductive assembly installed on the end cover 26 can be limited.

[0110] It can be understood that the first boss 21 is not limited to being formed on the end cover 26. For example, the first boss 21 is formed on the shell 25.

[0111] In an embodiment, referring to FIG. 5, the ratio of the depth of the first sub-hole 231 to the thickness of the end cover 26 is a first ratio, and the first ratio ranges from 0.2 to 0.5.

[0112] The depth of the first sub-hole 231 is shown as T2 in the figure, and the thickness of the end cover 26 is shown as T0 in the figure. The thickness of the end cover 26 does not include the depth of the recess 22.

[0113] For example, the first ratio is 0.2, 0.35, 0.4, or 0.5.

[0114] In an embodiment, the ratio of the depth of the first sub-hole 231 to the thickness of the end cover 26 ranges from 0.2 to 0.5, which can ensure that the structural strength of the end cover 26 at the first boss 21 basically meets the requirements, and facilitate the first boss 21 to be punched to a suitable height.

[0115] It can be understood that the range of the first ratio is not limited to 0.2 to 0.5. For example, the first ratio ranges from 0.6.

[0116] In an embodiment, referring to FIG. 5, the minimum distance between the hole wall surface of the second sub-hole 232 and the outer surface of the first boss 21 is a preset distance, the ratio of the preset distance to the thickness of the end cover 26 is a second ratio, and the second ratio ranges from 0.35 to 0.8.

[0117] The preset distance is shown as T3 in the figure, and the thickness of the end cover 26 is shown as T0 in the figure.

[0118] For example, the second ratio is 0.35, 0.5, 0.7, or 0.8.

[0119] For example, the distance between the second surface 234 of the second sub-hole 232 and the outer surface of the first boss 21 is the minimum.

[0120] In an embodiment, the ratio of the preset distance to the thickness of the end cover 26 ranges from 0.35 to 0.8, which makes the structural strength of the first boss 21 at the corner basically meet the requirements, and facilitates the first boss 21 to be punched to a more suitable height.

[0121] It can be understood that the range of the second ratio is not limited to 0.35 to 0.8. For example, the second ratio is 0.9.

[0122] In an embodiment, referring to FIGS. 3 and 5, the side of the end cover 26 facing away from the electrode assembly 1 is formed with a recess 22, and the recess 22 and the first boss 21 surround to form a sink 24 around the first boss 21, and the opening direction of the sink 24 faces away from the electrode assembly 1.

[0123] Exemplarily, the recess 22 and the sink 24 are formed by stamping.

[0124] In the embodiment, by arranging the sink 24 around the first boss 21, the side of the first boss 21 along the first direction is as close as possible to being parallel to the first direction, which reduces the possibility of the conductive assembly 3 slipping off the first boss 21, and enables the first boss 21 to better limit the conductive assembly 3.

[0125] It can be understood that the sink 24 can not be arranged around the first boss 21. Exemplarily, the recess 22 is connected with the first boss 21.

[0126] In an embodiment, referring to FIG. 5, the ratio of the depth of the sink 24 to the thickness of the end cover 26 is a third ratio, and the range of the third ratio is 0.02-0.1.

[0127] The depth of the sink 24 is shown as T1 in the figure, and the thickness of the end cover 26 is shown as T0 in the figure. The thickness of the end cover 26 does not include the depth of the recess 22.

[0128] Exemplarily, the third ratio is 0.02, 0.05, 0.08 or 0.1.

[0129] In the embodiment, the range of the third ratio is set to 0.02-0.1, which can limit the depth of the sink 24, and under the premise that the structural strength of the end cover 26 basically meets the requirements, enables the side of the first boss 21 along the first direction to be as close as possible to being parallel to the first direction.

[0130] It can be understood that the range of the third ratio is not limited to 0.02-0.1. Exemplarily, the range of the third ratio is 0.11.

[0131] In an embodiment, referring to FIGS. 1 and 3, the shape of the sink 24 is a circular ring.

[0132] In the embodiment, the circular ring-shaped sink 24 is convenient to process on the shell 2, and the transition of the groove wall of the sink 24 is relatively smooth, which is beneficial to reducing stress concentration.

[0133] It can be understood that the sink 24 is not limited to be a circular ring. Exemplarily, the sink 24 is a square.

[0134] In an embodiment, referring to FIG. 5, the first protrusion 21 protrudes from the end cover 26 along the thickness direction of the end cover 26 by a first size, and the ratio of the first size to the thickness of the end cover 26 is a fourth ratio, and the fourth ratio ranges from 0.8 to 1.5.

[0135] The first size is shown as H in the figure, and the thickness of the end cover 26 is shown as T0 in the figure. The first size does not include the depth of the recess 22, and the thickness of the end cover 26 does not include the depth of the recess 22.

[0136] For example, the fourth ratio is 0.08, 1.0, 1.3, or 1.5.

[0137] In an embodiment of the present application, the ratio of the first size to the thickness of the end cover 26 ranges from 0.8 to 1.5, which limits the size of the first size, reduces the possibility of the first protrusion 21 being separated from the conductive assembly 3, and is beneficial to limiting the rotation of the conductive assembly 3. In addition, the height of the first size is appropriate, which facilitates the processing of the first protrusion 21.

[0138] It can be understood that the range of the fourth ratio is not limited to 0.8 to 1.5. For example, the range of the fourth ratio is 1.6.

[0139] In an embodiment, the material of the end cover 26 is steel.

[0140] In an embodiment of the present application, the material of the end cover 26 is steel, which makes the end cover 26 not easy to deform, reduces the degree of reducing the strength of the end cover 26 caused by manufacturing the first protrusion 21 on the end cover 26, and improves the structural strength of the end cover 26.

[0141] It can be understood that the material of the end cover 26 is not limited to steel. For example, the material of the end cover 26 is aluminum.

[0142] In an embodiment, referring to FIGS. 1, 2, 6, 7, and 8, the conductive assembly 3 includes an insulating piece 31 and a conductive terminal 32. The insulating piece 31 is located on the side of the shell 2 away from the electrode assembly 1, and the insulating piece 31 has a avoiding hole 312 and at least one second protrusion 311. Each second protrusion 311 is sleeved on a corresponding first protrusion 21. The conductive terminal 32 penetrates the avoiding hole 312, and the conductive terminal 32 is electrically connected with the electrode assembly 1. Each conductive terminal 32 is respectively sleeved on a corresponding second protrusion 311. The insulating piece 31 is at least partially located between the conductive terminal 32 and the shell 2.

[0143] For example, the insulating piece 31 is a plastic piece.

[0144] For example, the number of the second protrusions 311 is consistent with the number of the first protrusions 21.

[0145] In the embodiment of the present application, the second boss 311 of the insulating member 31 is sleeved on the first boss 21, the contact area of the insulating member 31 and the first boss 21 is increased, the insulating member 31 is prevented from being separated from the first boss 21, the conductive terminal 32 penetrates the avoiding hole 312 of the insulating member 31, the connection firmness between the conductive terminal 32 and the insulating member 31 is strengthened, the insulating member 31 is beneficial to limit the movement of the conductive terminal 32 relative to the first boss 21, and the insulating member 31 can also insulate the conductive terminal 32.

[0146] It can be understood that the conductive assembly 3 is not limited to be provided with the insulating member 31. For example, the conductive terminal 32 abuts against the shell 2.

[0147] In an embodiment, referring to FIGS. 1, 2, 6, 7 and 8, the conductive terminal 32 comprises a first conductive member 321 and a second conductive member 322, the first conductive member 321 penetrates the avoiding hole 312, the first conductive member 321 is electrically connected with the electrode assembly 1, the second conductive member 322 is connected with the first conductive member 321, the second conductive member 322 is located on the side of the shell 2 away from the electrode assembly 1, the second conductive member 322 is sleeved on the corresponding second boss 311, and the insulating member 31 is at least partially located between the second conductive member 322 and the shell 2.

[0148] In the embodiment of the present application, the second conductive member 322 is sleeved on the corresponding second boss 311, the insulating member 31 is at least partially located between the second conductive member 322 and the shell 2, and the movement of the conductive terminal 32 is limited by the cooperation of the second conductive member 322, the first conductive member 321 and the insulating member 31.

[0149] It can be understood that the conductive terminal 32 can not be provided with the second conductive member 322. For example, the first conductive member 321 is sleeved on the corresponding second boss 311, and the insulating member 31 is at least partially located between the first conductive member 321 and the shell 2.

[0150] In an embodiment, referring to FIGS. 1 to 8, the number of the first bosses 21 is at least two, and each conductive assembly 3 is in limiting contact with the at least two first bosses 21.

[0151] For example, the number of the first bosses 21 is two, three or four.

[0152] In the embodiment of the present application, the at least two first bosses 21 are in limiting contact with the conductive assembly 3, so that the conductive assembly 3 is limited at at least two different positions, which is beneficial to limit the rotation of the conductive assembly 3.

[0153] It can be understood that the number of the first bosses 21 is not limited. For example, the number of the first bosses 21 is one.

[0154] The embodiment of the present application provides a stamping method, comprising the following steps:

[0155] The shell is arranged between the first stamping die and the second stamping die, the first stamping die is formed with a cavity for avoiding the first boss 21, and the second stamping die is formed with a first pressure head including a first sub-pressure head and a second sub-pressure head connected with each other, the projection area of the second sub-pressure head is located in the projection area of the first sub-pressure head in the arrangement direction of the first sub-pressure head and the second sub-pressure head, the first sub-pressure head is used for stamping out the first sub-hole 231, and the second sub-pressure head is used for stamping out the second sub-hole 232 and the first boss 21.

[0156] The at least one of the first stamping die and the second stamping die is driven to move to the other one to stamp the shell 2 between the first stamping die and the second stamping die.

[0157] In the embodiment of the present application, the first stamping die and the second stamping die cooperate, the first sub-pressure head stamps the shell to form the first sub-hole 231, and the second sub-pressure head stamps the shell to form the second sub-hole 232 and the first boss 21, the first boss 21 is partially located in the cavity, and the first sub-hole 231, the second sub-hole 232 and the first boss 21 are conveniently stamped and formed on the shell.

[0158] In an embodiment, the first stamping die is further formed with a second pressure head for stamping out the sink 24.

[0159] In the embodiment of the present application, the second pressure head conveniently stamps the sink 24 on the side of the shell away from the second sub-hole.

[0160] In an embodiment, referring to FIGS. 1-8, the housing 2 has at least one first boss 21 protruding in a direction away from the electrode assembly 1 and a counterbore 23 corresponding to each first boss 21, the electrode assembly 1 is located in the housing 2, the counterbore 23 is located on a side of the housing 2 facing the electrode assembly 1, the first boss 21 and the arrangement direction of the electrode assembly 1 are the first direction, the counterbore 23 has a first sub-hole 231 and a second sub-hole 232 that are in communication with each other, the first sub-hole 231 is located on a side of the second sub-hole 232 facing the electrode assembly 1 in the first direction, the second sub-hole 232 is partially formed in the first boss 21, the projection area of the second sub-hole 232 in the first direction is at least partially located in the projection area of the first sub-hole 231, the conductive assembly 3 is at least partially electrically connected with the electrode assembly 1, the number of the conductive assembly 3 is at least one, each conductive assembly 3 is in limiting contact with at least one first boss 21, the projection area of the first boss 21 in the first direction is located in the projection area of the first sub-hole 231, the hole wall surface of the second sub-hole 232 includes a first surface 233 and a second surface 234 that are connected with each other, the second surface 234 surrounds the first surface 233, the included angle between the first surface 233 and the second surface 234 ranges from 95° to 120°, the housing 2 includes a shell 25 and an end cover 26, the end cover 26 is connected with the shell 25, the electrode assembly 1 is located in a space surrounded by the shell 25 and the end cover 26, the first boss 21 is formed in the end cover 26, the first boss 21 protrudes in a direction away from the electrode assembly 1 along the end cover 26, the counterbore 23 is located on a side of the end cover 26 facing the electrode assembly 1, the ratio of the depth of the first sub-hole 231 to the thickness of the end cover 26 is the first proportion, the first proportion ranges from 0.2 to 0.5, the minimum distance between the hole wall surface of the second sub-hole 232 and the outer surface of the first boss 21 is the preset distance, the ratio of the preset distance to the thickness of the end cover 26 is the second proportion, the second proportion ranges from 0.35 to 0.8, a recess 22 is formed on a side of the end cover 26 away from the electrode assembly 1, the recess 22 and the first boss 21 surround a sink groove 24 around the first boss 21, the opening direction of the sink groove 24 is away from the electrode assembly 1, the ratio of the depth of the sink groove 24 to the thickness of the end cover 26 is the third proportion, the third proportion ranges from 0.02 to 0.1, the size of the first boss 21 protruding from the end cover 26 in the thickness direction of the end cover 26 is the first size, the ratio of the first size to the thickness of the end cover 26 is the fourth proportion, the fourth proportion ranges from 0.8 to 1.5, the shape of the sink 24 is circular, the conductive assembly 3 includes an insulating piece 31 and a conductive terminal 32, the insulating piece 31 is located on the side of the shell 2 away from the electrode assembly 1, the insulating piece 31 has an avoiding hole 312 and at least one second boss 311, each second boss 311 is sleeved on the corresponding first boss 21, the conductive terminal 32 penetrates the avoiding hole 312, the conductive terminal 32 is electrically connected with the electrode assembly 1, each conductive terminal 32 is respectively sleeved on the corresponding second boss 311, the insulating piece 31 is at least partially located between the conductive terminal 32 and the shell 2, the conductive terminal 32 includes a first conductive piece 321 and a second conductive piece 322, the first conductive piece 321 penetrates the avoiding hole 312, the first conductive piece 321 is electrically connected with the electrode assembly 1, the second conductive piece 322 is connected with the first conductive piece 321, the second conductive piece 322 is located on the side of the shell 2 away from the electrode assembly 1, the second conductive piece 322 is sleeved on the corresponding second boss 311, the insulating piece 31 is at least partially located between the second conductive piece 322 and the shell 2, the material of the end cover 26 is steel, the number of the first boss 21 is at least two, and each conductive assembly 3 is in limiting contact with at least two first bosses 21.

[0161] In the description of the present application, the description of the terms "in an embodiment", "in some embodiments", "in another embodiment", "in yet another embodiment", or "exemplary" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the exemplary description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present application and the features of different embodiments or examples can be combined by those skilled in the art without contradiction.

[0162] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various changes and modifications to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application is included in the protection scope of the present application.

Claims

1. A battery cell, comprising: an electrode assembly; a housing having at least one first boss protruding in a direction away from the electrode assembly and a counterbore corresponding to each of the first bosses, the electrode assembly being located in the housing, the counterbore being located on a side of the housing facing the electrode assembly, the first boss and the electrode assembly being arranged in a first direction, the counterbore having a first sub-hole and a second sub-hole in communication with each other, the first sub-hole being located on a side of the second sub-hole facing the electrode assembly in the first direction, the second sub-hole being partially formed in the first boss, and the projection area of the second sub-hole in the first direction being at least partially located in the projection area of the first sub-hole; and at least one electrically conductive assembly at least partially electrically connected to the electrode assembly, each of the electrically conductive assemblies being in contact with at least one of the first bosses. The projection area of the first boss in the first direction is located in the projection area of the first sub-hole. The hole wall surface of the second sub-hole comprises a first surface and a second surface connected to each other, the second surface surrounding the first surface, and the included angle between the first surface and the second surface ranges from 95° to 120°. The housing comprises: a shell; and an end cover connected to the shell, the electrode assembly being located in a space enclosed by the shell and the end cover, the first boss being formed on the end cover, the first boss protruding in a direction away from the electrode assembly, and the counterbore being located on a side of the end cover facing the electrode assembly.

2. The battery cell of claim 1, wherein, The ratio of the depth of the first sub-hole to the thickness of the end cover is a first ratio, and the first ratio ranges from 0.2 to 0.

5.

3. The battery cell of claim 1 or 2, wherein, The minimum distance between the hole wall surface of the second sub-hole and the outer surface of the first boss is a preset distance, the ratio of the preset distance to the thickness of the end cover is a second ratio, and the second ratio ranges from 0.35 to 0.

8.

4. The battery cell according to any one of claims 1 to 3, wherein, The side of the end cover away from the electrode assembly is provided with a recess, the recess and the first boss enclosing a sink groove surrounding the first boss, and the opening direction of the sink groove is away from the electrode assembly. The ratio of the depth of the sink groove to the thickness of the end cover is a third ratio, and the third ratio ranges from 0.02 to 0.

1. The shape of the sink groove is a circular ring.

5. The battery cell of claim 4, wherein, The first boss protrudes from the end cover in the thickness direction of the end cover by a first size, the ratio of the first size to the thickness of the end cover is a fourth ratio, and the fourth ratio ranges from 0.8 to 1.

5.

6. The battery cell of claim 4 or 5, wherein, The material of the end cover is steel.

7. The battery cell according to any one of claims 4 to 6, wherein, The electrically conductive assembly comprises: an insulating member located on a side of the housing away from the electrode assembly, the insulating member having an avoiding hole and at least one second boss, each of the second bosses being sleeved on a corresponding first boss; and an electrically conductive terminal penetrating through the avoiding hole, the electrically conductive terminal being electrically connected to the electrode assembly, each of the electrically conductive terminals being sleeved on a corresponding second boss, and the insulating member being at least partially located between the electrically conductive terminal and the housing.

8. The battery cell of claim 7, wherein, ​ 9. The battery cell of claim 7 or 8, wherein, ​ 10. The battery cell according to any one of claims 4 to 9, wherein, ​ 11. The battery cell according to any one of claims 4 to 10, wherein, ​ 12. The battery cell according to any one of claims 1 to 11, wherein, ​ ​ ​ 13. The battery cell of claim 12, wherein, The conductive terminal comprises: a first conductive member penetrating through the avoiding hole, the first conductive member being electrically connected with the electrode assembly; a second conductive member connected with the first conductive member, the second conductive member being located on a side of the shell away from the electrode assembly, the second conductive member being sleeved on the second boss, and the insulating member being at least partially located between the second conductive member and the shell.

14. The battery cell of any one of claims 1-13, wherein, The number of the first bosses is at least two, and each of the conductive assemblies is in position contact with at least two of the first bosses.

15. A battery device, comprising: a box body; the battery cell according to any one of claims 1-14, the battery cell being installed in the box body.

16. An electric device, comprising: a device body; the battery device according to claim 15, the battery device being installed in the device body.

17. A stamping method, comprising the steps of: arranging a shell between a first stamping die and a second stamping die, the first stamping die being formed with a cavity for avoiding the first boss, and the second stamping die being formed with a first punch head comprising a first sub-punch head and a second sub-punch head connected with each other, a projection area of the second sub-punch head being located within a projection area of the first sub-punch head along an arrangement direction of the first sub-punch head and the second sub-punch head, the first sub-punch head being used for stamping out the first sub-hole, and the second sub-punch head being used for stamping out the second sub-hole and the first boss; driving at least one of the first stamping die and the second stamping die to move towards the other one to stamp the shell between the first stamping die and the second stamping die.

18. The stamping method of claim 17, wherein, The first stamping die is further formed with a second punch head, and the second punch head is used for stamping out the sink.

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