Battery cell, end cover, battery, and electrical apparatus

Abstract

The present application relates to a battery cell, an end cover, a battery, and an electrical apparatus. The battery cell comprises an end cover, the end cover comprises a cover plate, upper insulating pieces and electrode columns. Penetrating electrode column holes are formed in the cover plate, the upper insulating pieces are arranged on a top surface of the cover plate on one side along the thickness direction thereof, the electrode columns sequentially pass through the electrode column holes and the upper insulating pieces, top ends of the electrode columns are fixed to the upper insulating pieces, and the upper insulating pieces are fitted in an anti-rotation manner with the cover plate. The battery cell, end cover, battery and electrical apparatus of the embodiments of the present application can effectively fix the electrode columns in the circumferential direction.

Description

Battery cell, end cover, battery and electric device TECHNICAL FIELD

[0001] The present application relates to the technical field of battery, in particular to a battery cell, an end cover, a battery and an electric device. BACKGROUND

[0002] With the development of new energy, more and more fields use new energy as power. Due to the advantages of high energy density, recyclable charging, safety and environmental protection, power batteries are widely used in new energy vehicles, consumer electronics, energy storage systems and other fields.

[0003] However, in the actual application of the battery, the pole often rotates circumferentially, affecting the safety in use.

[0004] SUMMARY

[0005] Therefore, it is necessary to provide a battery cell, an end cover, a battery and an electric device for fixing the pole circumferentially.

[0006] The first aspect of the embodiment of the present application provides a battery cell, which comprises an end cover; the end cover comprises a cover plate, an upper insulating piece and a pole; the cover plate is formed with a through pole hole; the upper insulating piece is arranged on the top surface of one side of the cover plate along the thickness direction thereof; the pole is sequentially arranged through the pole hole and the upper insulating piece, and the top end of the pole is fixed with the upper insulating piece; wherein the upper insulating piece is rotationally matched with the cover plate.

[0007] By fixing the top end of the pole with the upper insulating piece and rotationally matching the upper insulating piece with the cover plate, the pole as a whole is relatively fixed circumferentially with the cover plate, so that the pole can be effectively fixed after the end cover of the battery cell is assembled, preventing the pole from rotating, even if the thickness of the cover plate is insufficient to independently arrange a fixing structure.

[0008] In one of the embodiments, the pole hole has an axis, and on at least one surface perpendicular to the axis, the edge of the upper insulating piece has a first contact point and a second contact point both in contact with the cover plate, wherein the distances between the first contact point and the second contact point and the axis are not equal. In this way, by arranging the edge of the upper insulating piece with the first contact point and the second contact point both in contact with the cover plate, and confirming that the distances between the first contact point and the second contact point and the axis are not equal, it is confirmed that the upper insulating piece cannot rotate circumferentially with the axis of the pole hole as the center.

[0009] In one of the embodiments, the cover plate is formed with a positioning portion, and the upper insulating member is formed with a matching portion which is adapted to be embedded in the positioning portion; one of the positioning portion and the matching portion is a groove, and the other is a hollow convex. In this way, the overall pole can be fixed relative to the cover plate in the circumferential direction through the positioning portion and the matching portion, so that the pole can be effectively fixed after the end cover of the battery monomer is assembled, and the rotation of the pole can be prevented.

[0010] In one of the embodiments, the ratio of the wall thickness of the positioning portion to the wall thickness of other regions of the cover plate in the thickness direction of the cover plate is 0.8-1.2 times. In this way, the strength of the positioning portion can be ensured, and the overall pole and the cover plate can be fixed relative to each other in the circumferential direction through the positioning portion and the matching portion.

[0011] In one of the embodiments, the cover plate is formed with a stepped portion, and the stepped portion is annularly arranged at the region of the cover plate close to the positioning portion. The stepped portion is punched at the region of the cover plate close to the positioning portion, so that the positioning portion is more full, and the dimensional error is reduced, thereby facilitating the positioning portion and the matching portion to be fixed relative to each other in the circumferential direction, and the pole can be effectively fixed on the cover plate, and the rotation of the pole can be prevented.

[0012] In one of the embodiments, the end cover comprises a lower insulating member which is arranged on the bottom surface of the cover plate on the other side in the thickness direction of the cover plate; the lower insulating member is formed with a matching portion corresponding to the region of the positioning portion, and the positioning portion and the matching portion are limitingly connected. The matching portion is formed on the lower insulating member corresponding to the region of the positioning portion, and the side of the positioning portion away from the top surface is limitingly connected with the matching portion; the lower insulating member can be limited by the positioning portion, so that the relative position of the lower insulating member and the cover plate can be fixed, and the rotation of the lower insulating member and the cover plate can be avoided; and the gap between the lower insulating member and the cover plate caused by the positioning portion can be avoided, so that the lower insulating member and the cover plate can be kept in the state of being attached to each other, and the assembly can be facilitated.

[0013] In one of the embodiments, the thickness of the cover plate is T, and 0.5mm

[0014] In one of the embodiments, the pole comprises a pole body and a riveting member, the pole body is arranged in the pole hole, and the riveting member is riveted on the section of the pole body protruding from the top surface to form the top end of the pole; and the upper insulating member wraps the bottom side surface and at least part of the outer peripheral surface of the riveting member. In this way, the creepage distance of the riveting member or the pole body to the cover plate can be effectively lengthened, the risk of electric leakage and short circuit can be reduced, and the safety of the battery can be improved.

[0015] In one of the embodiments, the upper insulating member comprises a bottom plate and a ring-shaped side wall, the bottom plate is formed with a through hole for the column to pass through, and the bottom plate is used to wrap the bottom side of the riveting member; the ring-shaped side wall is arranged around the edge of the bottom plate and extends in the thickness direction to wrap the riveting member. In this way, the electrical connection between the riveting member and the cover plate can be effectively isolated.

[0016] In one of the embodiments, the top surface of the cover plate is recessed downward as a whole corresponding to the area of the upper insulating member to form a limiting groove, the bottom end of the limiting groove away from the top surface protrudes from the bottom surface of the cover plate; the pole hole is arranged at the groove bottom of the limiting groove; and the upper insulating member is embedded in the limiting groove as a whole. In this way, the top surface of the cover plate is recessed downward as a whole corresponding to the area of the upper insulating member to form a limiting groove as a positioning part, the upper insulating member as a whole is a cooperating part installed in cooperation with the positioning part, and the limiting groove and the upper insulating member are embedded and fixed as a whole, so as to realize the relative fixation of the cover plate and the upper insulating member in the circumferential direction.

[0017] In one of the embodiments, a first step is formed on the top surface of the cover plate, and the first step is arranged around the slot opening of the limiting groove. By arranging the first step on the area close to the slot opening of the limiting groove, the stamping size of the limiting groove is more full, which is beneficial to reduce the size error, so as to facilitate the embedding of the limiting groove and the upper insulating member to realize the circumferential fixation, and further effectively fix the pole on the cover plate to prevent it from rotating.

[0018] In one of the embodiments, the end cover comprises a lower insulating member arranged on the bottom surface of the cover plate on the other side in the thickness direction; the lower insulating member is recessed downward corresponding to the area of the limiting groove to form an avoiding groove, and the bottom end of the limiting groove away from the top surface is embedded in the avoiding groove. By recessing the lower insulating member downward corresponding to the area of the limiting groove to form an avoiding groove, the groove bottom of the limiting groove away from the top surface can be embedded in the avoiding groove, so that the upper insulating member as a whole is embedded in the limiting groove as a cooperating part, and is embedded and positioned again by the groove bottom of the limiting groove and the avoiding groove, so that the upper insulating member and the lower insulating member are positioned on the opposite sides of the cover plate as a whole, respectively, to avoid rotating.

[0019] In one of the embodiments, the projection of the upper insulating member in the thickness direction is triangular, square, elliptical or tooth-shaped; and / or, the riveting member is triangular, square, elliptical or tooth-shaped.

[0020] In one of the embodiments, the top surface of the cover plate has at least two positioning grooves formed by locally recessing downward, and the positioning grooves are distributed on the sides of the pole hole; the bottom end of each positioning groove away from the top surface protrudes from the bottom surface of the cover plate; the upper insulating member has at least two positioning protrusions formed thereon as the matching part, and the positioning protrusions are embedded in the positioning grooves one by one. In this way, the positioning grooves formed by recessing downward from the top surface can serve as the positioning part, and the positioning protrusions protruding outward from the bottom surface of the top surface of the upper insulating member can serve as the matching part; the positioning grooves and the positioning protrusions are embedded and fixed, thereby realizing the relative fixation of the cover plate and the upper insulating member in the circumferential direction.

[0021] In one of the embodiments, the top surface of the cover plate has a second step formed thereon, and the second step is annularly arranged at the opening of the positioning groove. In this way, the punching size of the positioning groove can be more full, which is beneficial to reducing the size error, thereby facilitating the embedding of the positioning groove and the positioning protrusion to realize the circumferential fixation, and further effectively fixing the pole on the cover plate to prevent the rotation of the pole.

[0022] In one of the embodiments, the end cover comprises a lower insulating member arranged on the bottom surface of the cover plate on the other side along the thickness direction of the cover plate; the lower insulating member has a positioning groove formed by sinking downward at the position corresponding to the positioning groove, and the bottom end of the positioning groove away from the top surface is embedded in the positioning groove. In this way, the positioning protrusion on the upper insulating member is embedded in the positioning groove as the matching part, and the groove bottom of the positioning groove is embedded in the positioning groove again to ensure that the upper insulating member and the lower insulating member are positioned on the opposite two sides of the cover plate respectively, thereby preventing the rotation.

[0023] In one of the embodiments, the top surface of the cover plate has at least two positioning protrusions formed by locally protruding upward; the positioning protrusions are distributed on the sides of the pole hole; the bottom end of each positioning protrusion away from the top surface is recessed inward to form a hollow groove; the upper insulating member has at least two fixing grooves formed thereon, and the positioning protrusions and the fixing grooves are embedded one by one. In this way, the rivet fixed relative to the upper insulating member can be kept circumferentially fixed with the cover plate, and finally the pole as a whole can be kept in the state of rotation stop with the cover plate, thereby ensuring that the pole can be effectively fixed after the end cover of the battery monomer is assembled, and preventing the rotation of the pole.

[0024] In one of the embodiments, the bottom surface of the cover plate has a third step formed thereon, and the third step is annularly arranged at the opening of the hollow groove. In this way, the punching size of the positioning protrusion can be more full, which is beneficial to reducing the size error, thereby facilitating the embedding of the positioning protrusion and the fixing groove to realize the circumferential fixation, and further effectively fixing the pole on the cover plate to prevent the rotation of the pole.

[0025] In one of the embodiments, the end cover comprises a lower insulating piece arranged on the bottom surface of the cover plate on the other side along the thickness direction of the cover plate; the lower insulating piece is upwardly protruded to form a positioning column in the region corresponding to the air slot, and the air slot and the positioning column are embedded and positioned.

[0026] In one of the embodiments, the riveting piece is inwardly recessed to form an avoiding hole in the region corresponding to the fixed groove, and the end of the fixed groove away from the cover plate is embedded and positioned with the avoiding hole. The positioning is realized by twice positioning and matching of the positioning column and the air slot and the positioning protrusion and the fixed groove, so that the gap between the lower insulating piece and the cover plate can be avoided, and the state that the lower insulating piece and the cover plate can be kept in close contact is ensured, and the assembly is facilitated.

[0027] In one of the embodiments, the end cover comprises a sealing ring, the sealing ring is sleeved on the outer periphery of the column body, and the two ends of the sealing ring along the thickness direction of the cover plate are respectively abutted with the upper insulating piece and the lower insulating piece. In this way, the insulation isolation pole column and the cover plate can be realized.

[0028] The second aspect of the embodiments of the present application provides an end cover used in the above-mentioned battery monomer, the end cover comprises: a cover plate formed with a through pole column hole; an upper insulating piece arranged on the top surface of the cover plate on one side along the thickness direction of the cover plate; and a pole column sequentially arranged through the pole column hole and the upper insulating piece, and the top end of the pole column is fixed with the upper insulating piece; wherein the upper insulating piece is rotationally matched with the cover plate.

[0029] The third aspect of the embodiments of the present application provides a battery comprising the above-mentioned battery monomer.

[0030] The fourth aspect of the embodiments of the present application provides a power utilization device comprising the above-mentioned battery for providing electric energy.

[0031] The above description is only a summary of the technical solutions of the present application, in order to more clearly understand the technical means of the present application, and can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments of the present application. Obviously, the drawings described below are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating laborious work. In the drawings:

[0033] Fig. 1 is a structural schematic view of a vehicle provided by some embodiments of the present application.

[0034] Fig. 2 is an exploded structural schematic view of a battery provided by some embodiments of the present application.

[0035] Fig. 3 is a structural schematic diagram of a battery module according to some embodiments of the present application.

[0036] Fig. 4 is an exploded structural schematic diagram of a battery cell according to some embodiments of the present application.

[0037] Fig. 5 is an exploded structural schematic diagram of an end cover according to some embodiments of the present application.

[0038] Fig. 6 is a top view of the end cover according to some embodiments of the present application.

[0039] Fig. 7 is an A-A sectional view of the end cover shown in Fig. 6.

[0040] Fig. 8 is an exploded structural schematic diagram of an end cover according to some other embodiments of the present application.

[0041] Fig. 9 is a top view of the end cover according to some other embodiments of the present application.

[0042] Fig. 10 is a B-B sectional view of the end cover shown in Fig. 9 in one embodiment.

[0043] Fig. 11 is a structural schematic diagram of an upper insulating member according to some embodiments of the present application.

[0044] Fig. 12 is a B-B sectional view of the end cover shown in Fig. 9 in another embodiment.

[0045] Reference Signs

[0046] Vehicle - 1000; Battery - 100, Box - 110, First Part - 111, Second Part - 112, Battery Module - 120, Battery Cell - 121, End Cover - 122, Shell - 123, Electrode Assembly - 124, Controller - 200, Motor - 300; Cover Plate - 10, Pole Column Hole - 11, Axis - 11a, Top Surface - 12, Bottom Surface - 13, Positioning Part - 14, Limiting Groove - 14a, Positioning Groove - 14b, Positioning Convex - 14c, Empty Groove - 14d, Step Part - 16, First Step - 16a, Second Step - 16b, Third Step - 16c, Pole Column - 20, Column Body - 21, Riveting Member - 22, Avoidance Hole - 22a, Upper Insulating Member - 30, Positioning Convex - 31b, Fixing Groove - 31c, Bottom Plate - 32, Ring Side Wall - 33, Through Hole - 34, Lower Insulating Member - 40, Cooperating Part - 41, Avoidance Groove - 41a, Positioning Groove - 41b, Positioning Column - 41c, Sealing Ring - 50; Thickness Direction - X. DETAILED DESCRIPTION

[0047] 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 cannot be used to limit the protection scope of the present application.

[0048] 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 this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise required by context, singular terms shall include pluralities and vice versa. Unless otherwise required by context, conjugations of the term "comprise" or "comprising" shall include "consisting of" and "consisting essentially of."

[0049] In the description of the embodiments of the present application, if these technical terms "first", "second" and the like appear, these terms are only used for the purpose of description and 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 technical features indicated.

[0050] Reference herein 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 various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is expressly understood that the embodiments described herein are merely examples from a whole class of comparable embodiments which those skilled in the art will readily appreciate. It is also specifically intended that the various embodiments described herein can be combined in any and all permutations.

[0051] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0052] In the description of the embodiments of the present application, if the term "a plurality of" appears, the meaning of "a plurality of" is at least two (including two), for example, two, three, etc., unless otherwise expressly specifically limited. Similarly, if the term "a plurality of groups" appears, "a plurality of groups" refers to two groups or more (including two groups), and if the term "a plurality of pieces" appears, "a plurality of pieces" refers to two pieces or more (including two pieces).

[0053] In the description of the embodiments of the present application, if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0054] In the description of the embodiments of the present application, unless explicitly defined and limited otherwise, if there are technical terms "mount", "connect", "connect", "fix", etc., these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it 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 present application can be understood according to the specific circumstances.

[0055] In the present application, unless explicitly defined and limited otherwise, if there are similar descriptions of the first feature "on" or "under" the second feature, it means that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the second feature, or only indicates that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the second feature, or only indicates that the first feature is lower than the second feature in horizontal height.

[0056] It should be noted that if an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are for illustrative purposes only and are not the only embodiment.

[0057] At present, from the development of market situation, the application of power battery is more and more widely. The power battery is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of power battery, the demand of its market is also increasing.

[0058] In the related art, the end cover of the battery monomer mainly includes a cover plate, a pole assembled on the cover plate, an upper insulating piece for insulating the pole and the cover plate, etc. In order to ensure the positioning effect of the pole, the upper insulating piece and the cover plate, and to prevent rotation between the pole, the plastic part and the cover plate, a groove is often designed on the cover plate and the pole; the anti-rotation function is realized by passing the ceramic column through the grooves on the cover plate and the pole; but with this structure, the cover plate needs to have sufficient thickness to set the above ceramic column, which leads to the fact that the battery end cover with relatively thin cover plate cannot effectively design the anti-rotation structure.

[0059] In order to improve the problem of the thin cover plate and the circumferential fixation of the pole, the upper insulating piece and the cover plate are first rotationally stopped, so as to circumferentially fix the upper insulating piece and the cover plate, and the upper insulating piece and the top end of the pole are fixed, so as to circumferentially fix the pole and the cover plate, and effectively prevent rotation.

[0060] The battery monomer, the end cover, the battery and the electric device provided by the embodiments of the present application can be, but are not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric automobile, a ship, a spacecraft and the like. The electric toy can include a fixed or mobile electric toy, such as a game console, an electric automobile toy, an electric ship toy and an electric aircraft toy, and the spacecraft can include an airplane, a rocket, a space shuttle and a spacecraft.

[0061] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above-described battery and electric device, but can also be applied to all batteries including a box body and electric devices using the battery. For the sake of brevity of description, a vehicle 1000 is taken as an example of an electric device of the embodiments of the present application.

[0062] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 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. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000. 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 working power demand of the vehicle 1000 during starting, navigation and driving.

[0063] In some embodiments of the present application, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0064] FIG. 2 is an exploded view of a battery 100 according to some embodiments of the present application; and FIG. 3 is a structural schematic view of a battery module according to some embodiments of the present application. Referring to FIGS. 2 and 3, to meet different power requirements, the battery 100 can include a plurality of battery cells 121 and a case 110, where the battery cell 121 refers to the smallest unit that constitutes a battery module 120 or a battery pack. The plurality of battery cells 121 are connected in series and / or in parallel to be applied to various application scenarios. The case 110 is used to accommodate the battery cells 121 or the battery module 120 to avoid the influence of liquid or other foreign matters on the charging or discharging of the battery cells 121.

[0065] The case 110 can adopt various structures. In some embodiments, the case 110 can include a first part 111 and a second part 112, where the first part 111 and the second part 112 are mutually covered to jointly define an accommodation space for accommodating the battery cells 121. The second part 112 can be a hollow structure with one end open, and the first part 111 can be a plate-shaped structure that covers the open side of the second part 112 to jointly define the accommodation space with the second part 112. Alternatively, the first part 111 and the second part 112 can both be hollow structures with one side open, and the open side of the first part 111 covers the open side of the second part 112. Of course, the case 110 formed by the first part 111 and the second part 112 can have various shapes, such as a simple solid structure of a cuboid or a cylinder or a sphere, or a complex solid structure composed of a cuboid or a cylinder or a sphere, and the embodiments of the present application are not limited in this regard. The material of the case 110 can be an alloy material such as an aluminum alloy or a ferrous alloy, a high polymer material such as polycarbonate or polyisocyanurate foam plastic, or a composite material such as glass fiber and epoxy resin, and the embodiments of the present application are not limited in this regard.

[0066] In the embodiments of the present application, the plurality of battery cells 121 can directly constitute a battery pack, or can first constitute a battery module 120, and the battery module 120 constitutes a battery pack. Specifically, the plurality of battery cells 121 can be directly connected in series, in parallel, or in a hybrid manner to form an entirety, and the entirety of the plurality of battery cells 121 is accommodated in the case 110. Alternatively, the plurality of battery cells 121 can first be connected in series, in parallel, or in a hybrid manner to constitute a battery module 120, and the plurality of battery modules 120 are connected in series, in parallel, or in a hybrid manner to form an entirety, which is accommodated in the case 110.

[0067] The battery 100 can further include other structures, for example, the battery 100 can further include a busbar component for realizing electrical connection between the plurality of battery cells 121.

[0068] Each battery cell 121 can be a secondary battery or a primary battery; can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 121 can be in a shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The battery cell 121 is generally classified into three types in a packaging manner: a cylindrical battery cell, a cuboid square battery cell, and a soft-pack battery cell, and the present embodiments are not limited thereto. However, for the sake of simplicity, the following embodiments are described by taking the cuboid square lithium-ion battery cell 121 as an example.

[0069] Please refer to FIG. 4, which is an exploded structural schematic diagram of the battery cell 121 provided by some embodiments of the present application. The battery cell 121 includes an end cover 122, a shell 123, an electrode assembly 124, and other functional components.

[0070] The end cover 122 refers to a component that covers the opening of the shell 123 to isolate the internal environment of the electrode assembly 124 from the external environment. Without limitation, the shape of the end cover 122 can be adapted to the shape of the shell 123 to fit the shell 123. In some embodiments, the end cover 122 can be made of a material with certain hardness and strength (such as aluminum alloy), so that the end cover 122 is not easy to deform when subjected to extrusion and collision, so that the battery cell 121 can have higher structural strength, and the safety performance can also be improved. The end cover 122 can be provided with functional components such as a pole, etc. The pole can be used for electrical connection with the electrode assembly 124, for outputting or inputting the electrical energy of the battery cell 121. In some embodiments, the end cover 122 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 121 when the internal pressure or temperature of the battery cell 121 reaches a threshold value. In some embodiments, an insulating piece can also be provided on the inner side of the end cover 122, which can be used to isolate the electrical connection components in the shell 123 from the end cover 122 to reduce the risk of short circuit. Exemplarily, the insulating piece can be plastic, rubber, etc.

[0071] The shell 123 is a component for cooperating with the end cover 122 to form an internal environment of the battery cell 121, and the formed internal environment can be used to accommodate the electrode assembly 124, electrolyte and other components. The shell 123 and the end cover 122 can be independent components, and an opening can be provided on the shell 123, and the end cover 122 is used to cover the opening to form the internal environment of the battery cell 121. Without limitation, the end cover 122 and the shell 123 can also be integrated, specifically, the end cover 122 and the shell 123 can form a common connecting surface before other components enter the shell, and when it is necessary to seal the internal environment of the shell 123, the end cover 122 is used to cover the shell 123. The shell 123 can be in various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell 123 can be determined according to the specific shape and size of the electrode assembly 124. The material of the shell 123 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon.

[0072] The electrode assembly 124 is a component in which electrochemical reactions occur in the battery cell 121. One or more electrode assemblies 124 can be contained in the shell 123. The electrode assembly 124 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually arranged between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have a portion with active material constituting a main body of the electrode assembly 124, and a portion without active material of the positive electrode sheet and the negative electrode sheet respectively constitutes a tab (not shown). The positive electrode tab and the negative electrode tab can be located at one end of the main body or at two ends of the main body respectively. In the charging and discharging process of the battery, the positive active material and the negative active material react with the electrolyte, and the tabs are connected to the pole to form a current loop.

[0073] FIG. 5 is an exploded structural schematic view of an end cover provided by some embodiments of the present application; FIG. 6 is a top view of the end cover provided by some embodiments of the present application; FIG. 7 is an A-A sectional view of the end cover shown in FIG. 6; FIG. 8 is an exploded structural schematic view of an end cover provided by some other embodiments of the present application; FIG. 9 is a top view of the end cover provided by some other embodiments of the present application; FIG. 10 is a B-B sectional view of the end cover shown in FIG. 9 in an embodiment; FIG. 11 is a structural schematic view of an upper insulating member shown in FIG. 10; and FIG. 12 is a B-B sectional view of the end cover shown in FIG. 9 in another embodiment.

[0074] The first aspect of the present application provides a battery cell 121.

[0075] Referring to FIGS. 1 to 12, the battery cell 121 includes an end cover 122, a shell 123 and an electrode assembly 124, and the end cover 122 covers an opening of the shell 123 to form an internal environment for accommodating the electrode assembly 124.

[0076] The end cover 122 comprises a cover plate 10, an upper insulating piece 30, and a pole 20. The cover plate 10 is formed with a pole hole 11. The upper insulating piece 30 is arranged on the top surface 12 of the cover plate 10 on one side along the thickness direction X. The pole 20 is sequentially arranged in the pole hole 11 and the upper insulating piece 30, and the top end of the pole 20 is fixed with the upper insulating piece 30. The upper insulating piece 30 is rotationally fixed with the cover plate 10.

[0077] The cover plate 10 has a top surface 12 and a bottom surface 13 on opposite sides along the thickness direction X. The bottom surface 13 of the cover plate 10 is the side of the cover plate 10 facing the inside of the shell 123 of the battery monomer 121 when the end cover 122 is covered on the opening of the shell 123. Correspondingly, the top surface 12 of the cover plate 10 is the other side of the cover plate 10 facing away from the inside of the shell 123. In various embodiments of the present application, the cover plate 10 can be made of a material with certain hardness and strength. For example, the cover plate 10 can be made of stainless steel or carbon steel. In addition, the cover plate 10 can also be made of other high-strength alloy steel as needed, and the embodiments of the present application do not make special limitations on this. The pole hole 11 penetrates the cover plate 10 along the thickness direction X of the cover plate 10, facilitating the fixation with the pole 10.

[0078] The upper insulating piece 30 is used to insulate the electrical connection between the pole 10 and the cover plate 10. In the embodiments of the present application, the upper insulating piece 30 can have a hollow structure with one end open. The material of the upper insulating piece 30 can be plastic, rubber, etc., and the embodiments of the present application do not make special limitations on this. The side of the upper insulating piece 30 facing away from the cover plate 10 is fixed with the top end of the pole 20. The specific fixing method can be fixed by wrapping part of the outer circumferential side of the top end of the pole 20, or fixed by setting corresponding teeth and grooves, or directly fixed by injection molding. The upper insulating piece 30 is arranged on the top surface 12 of the cover plate 10 on one side along the thickness direction X of the cover plate 10. The upper insulating piece 30 covers the area of the cover plate 10 where the pole hole 11 is arranged, and the upper insulating piece 30 also has a through hole 34 corresponding to the pole hole 11 to accommodate the pole 20.

[0079] The pole 20 is an element for inputting or outputting electric energy in the battery monomer 121. The pole 20 is sequentially arranged in the pole hole 11 and the upper insulating piece 30, i.e., the pole 20 is arranged in the pole hole 11 and the through hole 34. The top end of the pole 20 protrudes from the top surface 12 of the cover plate 10 on one side along the thickness direction Z, and the bottom end of the pole 20 can be electrically connected with the electrode assembly 124 through the adapter plate. In the charging and discharging process of the battery, the positive active material and the negative active material in the electrode assembly 124 react with the electrolyte. The tabs of the electrode assembly 124 can be connected with the pole 20 through the adapter plate to form a current loop. The pole 20 is a conductive material piece, including but not limited to copper material, aluminum material, or other alloy materials.

[0080] By setting the top end of the pole 20 to be fixed with the upper insulating piece 30, and setting the upper insulating piece 30 to be rotationally matched with the cover plate 10, the pole 20 as a whole is kept circumferentially fixed relative to the cover plate 10. In this way, even if the thickness of the cover plate 10 is insufficient to independently set a fixed structure, it can still ensure that the pole 20 can be effectively fixed after the end cover 122 of the battery monomer 121 is assembled, preventing the pole 20 from rotating.

[0081] It can be understood that the end cover 122 includes two poles 20, one of which serves as the positive pole of the battery monomer 121, and the other of which serves as the negative pole of the battery monomer 121. Correspondingly, the cover plate 10 is provided with two pole holes 11 to correspond to the two poles 20 respectively. Similarly, the end cover 122 includes two upper insulating pieces 30 to cover the areas of the cover plate 10 where the two pole holes 11 are provided, and to match with the two poles 20 respectively. The pole 20 in the embodiment of the present application can be a negative pole or a positive pole.

[0082] In some embodiments, the cover plate 10 as a whole can be in a thin plate structure, and the thickness T of the cover plate 10 satisfies: 0.5 millimeters (mm) < T ≤ 1.5 millimeters (mm). As an example, the thickness T of the cover plate 10 in other areas can be, but is not limited to, 0.5 mm, 0.75 mm, 0.84 mm, 0.97 mm, 1.0 mm, 1.15 mm, 1.28 mm, 1.43 mm, 1.5 mm, etc. In a specific setting, the thickness T of the cover plate 10 can be set to 0.8 mm ≤ T ≤ 1.2 mm to ensure that it has better structural strength and stamping characteristics.

[0083] In some possible embodiments, referring to FIGS. 5 to 12, the pole hole 11 has an axis 11a, and the edge of the upper insulating piece 30 has a first contact point and a second contact point both in contact with the cover plate 10 on at least one face perpendicular to the axis 11a, wherein the first contact point and the second contact point are not equal in distance from the axis 11a.

[0084] In this way, by setting the edge of the upper insulating piece 30 to have a first contact point and a second contact point both in contact with the cover plate 10, and confirming that the first contact point and the second contact point are not equal in distance from the axis 11a, that is, the edge of the upper insulating piece 30 is not a circular shape where the distance to the axis 11a is equal everywhere, so as to confirm that the upper insulating piece 30 cannot rotate circumferentially with the axis 11a of the pole hole 11 as the center of rotation.

[0085] In some embodiments, the upper insulating piece 30 in the embodiment of the present application is a semicircle, a rectangle, a square, a triangle, a rhombus, etc. in projection along the extension direction of the axis 11a.

[0086] In some possible embodiments, referring to FIGS. 5-12, the cover plate 10 is formed with a positioning portion 14, and the upper insulating member 30 is formed with a cooperating portion adapted to be embedded in the positioning portion 14. The positioning portion 14 and the cooperating portion achieve the rotation-stopping cooperation between the upper insulating member 30 and the cover plate 10 through embedding.

[0087] Specifically, one of the positioning portion 14 and the cooperating portion is a groove, and the other is a hollow convex. In this way, the overall pole 20 and the cover plate 10 can be kept circumferentially fixed through the positioning portion 14 and the cooperating portion, so that the pole 20 can be effectively fixed after the end cover 122 of the battery monomer 121 is assembled, and rotation of the pole 20 can be prevented.

[0088] In some possible embodiments, referring to FIGS. 5-12, the ratio of the wall thickness of the positioning portion 14 to the wall thickness of other regions of the cover plate 10 along the thickness direction X of the cover plate 10 is 0.8-1.2 times. The other regions refer to regions of the cover plate 10 excluding the positioning portion 14.

[0089] The wall thickness of the positioning portion 14 is integrally connected with the other regions of the cover plate 10, and the cover plate 10 can be formed with the positioning portion 14 through a stamping and drawing process. In this way, the wall thickness of the region where the positioning portion 14 is located will not change greatly relative to the other regions of the cover plate 10. Especially when the wall thickness of the cover plate 10 is thin, a groove or a convex for positioning cannot be formed on the cover plate 10 through turning and milling, and the positioning portion 14 can be stamped on the cover plate 10 through stamping, and the thickness will not change much, which can ensure the strength of the positioning portion 14 and keep the overall pole 20 and the cover plate 10 circumferentially fixed through the positioning portion 14 and the cooperating portion.

[0090] In some embodiments, the wall thickness of the other regions of the cover plate 10 is generally T, and 0.5mm

[0091] In some possible embodiments, referring to FIGS. 5-12, the cover plate 10 is formed with a stepped portion 16, and the stepped portion 16 is annularly arranged at a region of the cover plate 10 close to the positioning portion 14.

[0092] In the stamping process, the step portion 16 is stamped on the cover plate 10 near the positioning portion 14, so that the positioning portion 14 is stamped more full, the size error is reduced, the positioning portion 14 and the cooperating portion are kept circumferentially fixed, the pole 20 is effectively fixed on the cover plate 10, and rotation of the pole 20 is prevented.

[0093] In some possible embodiments, referring to FIGS. 5 to 12, the end cover 122 includes a lower insulating piece 40 arranged on the bottom surface 13 of the cover plate 10 on the other side in the thickness direction of the cover plate 10. The lower insulating piece 40 is formed with a cooperating portion 41 corresponding to the region of the positioning portion 14, and the side of the positioning portion 14 away from the top surface 12 is in limiting connection with the cooperating portion 41.

[0094] The lower insulating piece 40 can have a sheet structure, and the shape and area of the lower insulating piece 40 are basically consistent with those of the cover plate 10. The lower insulating piece 40 can be integrally attached to the bottom surface 13 of the cover plate 10 on the other side in the thickness direction of the cover plate 10. The lower insulating piece 40 can be used to isolate the pole 20 and the cover plate 10, and the cover plate 10 and other electrically connected components in the shell 123, thereby effectively reducing the risk of short circuit. For example, the lower insulating piece 30 can be made of plastic, rubber, or the like, and the embodiments of the present application do not have special limitations in this regard.

[0095] The lower insulating piece 40 is formed with the cooperating portion 41 corresponding to the region of the positioning portion 14, and the side of the positioning portion 14 away from the top surface 12 is in limiting connection with the cooperating portion 41. The lower insulating piece 40 can be limited with the positioning portion 14, so as to ensure that the relative position of the lower insulating piece 40 and the cover plate 10 is fixed and rotation is avoided. The lower insulating piece 40 and the cover plate 10 can be prevented from being spaced apart due to the positioning portion 14, so as to ensure that the lower insulating piece 40 and the cover plate 10 are attached, and assembly is facilitated.

[0096] It can be understood that, in order to pass the pole 20, a via hole (not labeled) corresponding to the pole hole 11 is also formed on the lower insulating piece 40. In this way, the pole 20 can be sequentially arranged through the lower insulating piece 40, the pole hole 11, and the upper insulating piece 30.

[0097] In some possible embodiments, referring to FIGS. 5 to 12, the pole 20 includes a pole body 21 and a riveting piece 22. The pole body 21 is arranged through the pole hole 11. The riveting piece 22 is riveted on the section of the pole body 21 protruding from the top surface 12 to form a top end of the pole 20. The upper insulating piece 30 wraps the bottom side surface and at least part of the outer peripheral surface of the riveting piece 22.

[0098] The riveting piece 22 can be in a disc structure as a whole, and a riveting hole (not labeled) is arranged at the middle portion and matched with the column body 21. The column body 21 is in a column structure extending along the thickness direction X, and the diameter of the section of the column body 21 on the side of the bottom surface 13 is greater than the diameter of the pole column hole 11. The section of the column body 21 protruding from the top surface 12 is inserted into the riveting hole of the riveting piece 22 and then riveted and fixed, so as to form the riveting piece 22 and the column body 21 as a whole.

[0099] In various embodiments of the present application, the riveting piece 22 and the column body 21 can be made of a metal conductive material with certain hardness and strength. The materials of the riveting piece 22 and the column body 21 can be the same or different, for example, one or more of copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiments of the present application do not make special limitations thereon.

[0100] The riveting piece 22 is riveted on the section of the column body 21 protruding from the top surface 12 of the cover plate 10 along the thickness direction thereof, so as to form the top end of the pole column 20. The upper insulating piece 30 wraps the bottom side surface and at least part of the outer peripheral surface of the riveting piece 22. In this way, the creepage distance of the riveting piece 22 or the column body 21 to the cover plate 10 can be effectively lengthened, the risk of electric leakage and short circuit is reduced, and the safety of the battery is improved.

[0101] In some possible embodiments, referring to FIGS. 5 to 12, the upper insulating piece 30 includes a bottom plate 32 and a ring side wall 33. The bottom plate 32 is formed with a through hole 34 for the column body 21 to pass through. The bottom plate 32 is used to wrap the bottom side surface of the riveting piece 22. The ring side wall 33 is annularly arranged at the edge of the bottom plate 32 and extends along the thickness direction X, so as to wrap the riveting piece 22.

[0102] The bottom plate 32 and the ring side wall 33 are jointly formed into a cavity structure with one end open. The bottom plate 32 covers the area of the cover plate 10 where the pole column hole 11 is arranged, and the through hole 34 corresponding to the pole column hole 11 is formed on the bottom plate 32, so as to allow the column body 21 to pass through. The section of the column body 21 protruding from the through hole 34 is riveted and fixed with the riveting piece 22. The ring side wall 33 wraps the outer peripheral side surface of the riveting piece 22, and the bottom plate 32 is isolated between the riveting piece 22 and the cover plate 10. In this way, the electrical connection between the riveting piece 22 and the cover plate 10 can be effectively isolated. In combination with other insulating structures, for example, the lower insulating piece 40 and the sealing ring 50 (mentioned below), the electrical connection between the pole column 20 and the cover plate 10 can be effectively isolated, so as to prevent the phenomenon of electric leakage and liquid leakage.

[0103] In some embodiments, the bottom plate 32 and the ring side wall 33 can be integrally connected, and both are made of plastic, rubber or other materials.

[0104] In some possible embodiments, referring to FIGS. 5-7, the top surface 12 of the cover plate 10 is recessed downward as a whole corresponding to the region of the upper insulating member 30 to form a limiting recess 14a. The limiting recess 14a protrudes from the bottom surface 13 of the cover plate 10 away from the bottom end of the top surface 12. The pole column hole 11 is arranged at the bottom of the limiting recess 14a; and the upper insulating member 30 is embedded in the limiting recess 14a as a whole to achieve circumferential limiting.

[0105] In this way, the top surface 12 of the cover plate 10 is recessed downward as a whole corresponding to the region of the upper insulating member 30 to form the limiting recess 14a as the positioning portion 14, and the upper insulating member 30 is embedded in the limiting recess 14a as a whole to achieve circumferential limiting. In this way, the relative fixing of the cover plate 10 and the upper insulating member 30 in the circumferential direction is achieved, and the riveting member 22 fixed relative to the upper insulating member 30 can be fixed relative to the cover plate 10 in the circumferential direction, so that the relative rotation between the pole column 20 and the cover plate 10 is finally achieved. In this way, the thickness of the cover plate 10 is insufficient to independently provide a fixing structure, but the pole column 20 can still be effectively fixed after the end cover 122 of the battery monomer 121 is assembled to prevent rotation.

[0106] It should be noted that the limiting recess 14a is not a simple blind hole, but a structure that is recessed as a whole, and the thickness of the bottom of the limiting recess 14a is equal to or close to the thickness of other regions of the cover plate 10. In this way, the limiting recess 14a protrudes from the bottom surface 13 of the cover plate 10 away from the bottom end of the top surface 12. In this way, the riveting member 22 and the upper insulating member 30 can be recessed relative to the cover plate 10 as a whole, and the height of the pole column 20 relative to the cover plate 10 can be controlled, and the height of the battery monomer 121 as a whole can be effectively controlled.

[0107] In some possible embodiments, referring to FIGS. 5-7, the upper insulating member 30 is at least partially accommodated in the limiting recess 14a, so that the upper insulating member 30 is limited between the riveting member 22 and the inner wall of the limiting recess 14a in a direction perpendicular to the thickness direction.

[0108] By arranging the limiting recess 14a to limit the upper insulating member 30 between the riveting member 22 and the inner wall of the limiting recess 14a, the upper insulating member 30 can be reliably limited, so that the risk of mispositioning due to the influence of external equipment is avoided, and the risk of short circuit is further avoided.

[0109] In some possible embodiments, referring to FIGS. 5-7, the top surface 12 of the cover plate 10 is recessed downward as a whole corresponding to the region of the upper insulating member 30 to form a limiting recess 14a. The limiting recess 14a protrudes from the bottom surface 13 of the cover plate 10 away from the bottom end of the top surface 12. The pole column hole 11 is arranged at the bottom of the limiting recess 14a; and the upper insulating member 30 is embedded in the limiting recess 14a as a whole to achieve circumferential limiting.

[0110] By setting the first step 16a on the area close to the notch of the limiting groove 14a, especially in the process of stamping, the stamping size of the limiting groove 14a can be more full, which is beneficial to reduce the size error, so as to facilitate the embedding of the limiting groove 14a and the upper insulating piece 30 to achieve circumferential fixation, and then effectively fix the pole 20 on the cover plate 10 to prevent it from rotating.

[0111] In some embodiments, the total depth of the first step 16a is 0.1-0.3 times the thickness T of the cover plate 10, which can be designed as required.

[0112] In some possible embodiments, referring to FIGS. 5-7, the end cover 122 includes a lower insulating piece 40 arranged on the bottom surface 13 of the cover plate 10 on the other side along the thickness direction thereof; the lower insulating piece 40 is lowered downward to form a avoiding groove 41a corresponding to the area of the limiting groove 14a, and the bottom end of the limiting groove 14a away from the top surface 12 is embedded in the avoiding groove 41a.

[0113] The lower insulating piece 40 can be in a sheet structure, and the shape and area of the lower insulating piece 40 are basically consistent with those of the cover plate 10. The lower insulating piece 40 can be integrally attached to the bottom surface 13 of the cover plate 10 on the other side along the thickness direction thereof. The lower insulating piece 40 can be used to isolate the pole 20 and the cover plate 10, and the cover plate 10 and other electrically connected components in the shell 123, thereby effectively reducing the risk of short circuit. For example, the lower insulating piece 30 can be made of plastic, rubber, etc., and the embodiments of the present application do not have special restrictions thereon.

[0114] By lowering the lower insulating piece 40 to form the avoiding groove 41a corresponding to the area of the limiting groove 14a, the groove bottom of the limiting groove 14a away from the top surface 12 can be embedded in the avoiding groove 41a. In this way, the upper insulating piece 30 as a fitting part is embedded in the limiting groove 14a, and is again embedded and positioned by the groove bottom of the limiting groove 14a and the avoiding groove 41a, so that the upper insulating piece 30 and the lower insulating piece 40 are respectively positioned on the opposite sides of the cover plate 10, and rotation is avoided. The gap between the lower insulating piece 40 and the cover plate 10 caused by the limiting groove 14a is avoided, and the state of adhesion between the lower insulating piece 40 and the cover plate 10 is ensured, facilitating assembly.

[0115] In some possible embodiments, referring to FIGS. 5-12, the projection of the upper insulating piece 30 can be triangular, square, elliptical or tooth-shaped in the thickness direction X; without limitation, the projection of the upper insulating piece 30 can also be any non-circular shape. In this way, by controlling the shape of the upper insulating piece 30 and cooperating with the limiting groove 14a, it can be ensured that the upper insulating piece 30 cannot rotate circumferentially with the axis 11a of the pole hole 11 as the center.

[0116] In some embodiments, the upper insulation member 30 is formed as a shell structure with one end open and capable of partially wrapping the rivet member 22. The inner cavity of the upper insulation member 30 can be correspondingly formed as a triangle, square, oval or tooth shape, and thus the rivet member 22 is designed as a triangle block, square block, oval block or tooth block to facilitate the wrapping by the upper insulation member 30 and the circumferential fixation of the two.

[0117] In some possible embodiments, referring to FIGS. 8-11, the top surface 12 of the cover plate 10 has at least two positioning recesses 14b formed by locally recessing downward at the regions corresponding to the upper insulation member 30. All the positioning recesses 14b are distributed at the sides of the pole hole 11. The bottom end of each positioning recess 14b protrudes from the bottom surface 13 of the cover plate 10 away from the top surface 12. The upper insulation member 30 is formed with at least two positioning protrusions 31b as the mating parts, which are correspondingly embedded with the positioning recesses 14b to achieve the circumferential limiting.

[0118] In this way, the positioning recesses 14b formed by recessing downward from the top surface 12 can serve as the positioning parts 14, and the positioning protrusions 31b protruding outward from the bottom surface of the upper insulation member 30 facing the top surface 12 serve as the mating parts. Through the embedding and fixation of the positioning recesses 14b and the positioning protrusions 31b, the relative fixation of the cover plate 10 and the upper insulation member 30 in the circumferential direction is achieved. Further, the rivet member 22 fixed relative to the upper insulation member 30 can be kept fixed relative to the cover plate 10 in the circumferential direction, and finally the rotation between the pole 20 as a whole and the cover plate 10 is stopped, so that the pole 20 can be effectively fixed after the assembly of the end cover 122 of the battery monomer 121 is completed, and the rotation of the pole 20 is prevented.

[0119] In some embodiments, the positioning recesses 14b can be circular, square, triangular or other shapes in the thickness direction projection, and the depth of the positioning recesses 14b in the thickness direction should be greater than the thickness of the cover plate 10. Specifically, a punching process can be used to form a recess recessed away from the rivet member 22 on the cover plate 10, which is good in process and low in cost.

[0120] Referring to FIGS. 8-11, the positioning protrusions 31b can be designed according to the shape of the positioning recesses 14b to be matched to satisfy the embedding and fixation of the positioning recesses 14b and the positioning protrusions 31b. For example, the positioning protrusions 31b can be cylindrical, square, triangular or other shapes. The upper insulation member 30 can be integrally formed with the corresponding positioning protrusions 31b by injection molding, so as to be positioned with the positioning recesses 14b.

[0121] Referring to FIGS. 8-11, the number of positioning grooves 14b is not less than 2, and the positioning protrusions 31b correspond to the positioning grooves 14b one by one; all the positioning grooves 14b are distributed on the side of the pole hole 11; in this way, the upper insulating piece 30 can be positioned by at least two positioning protrusions 31b and the positioning grooves 14b of the cover plate 10, ensuring that the upper insulating piece 30 cannot rotate circumferentially with the axis 11a of the pole hole 11 as the center.

[0122] In some possible embodiments, referring to FIGS. 8-11, a second step 16b is formed on the top surface 12 of the cover plate 10, and the second step 16b is annularly arranged at the opening of the positioning groove 14b.

[0123] By arranging the second step 16b on the area close to the opening of the positioning groove 14b, especially in the stamping process, the stamping size of the positioning groove 14b can be more full, which is beneficial to reduce the size error, so as to facilitate the embedding of the positioning groove 14b and the positioning protrusion 31b, to achieve circumferential fixation, and then effectively fix the pole 20 on the cover plate 10, preventing it from rotating.

[0124] In some embodiments, the total depth of the second step 16b is 0.1-0.3 times the thickness T of the cover plate 10, which can be designed as required.

[0125] In some possible embodiments, referring to FIGS. 8-10, the end cover 122 includes a lower insulating piece 40 arranged on the bottom surface 13 of the cover plate 10 on the other side along the thickness direction thereof; the lower insulating piece 40 is lowered to form a positioning groove 41b corresponding to the area of the positioning groove 14b, and the bottom end of the positioning groove 14b away from the top surface 12 is embedded in the positioning groove 41b.

[0126] By lowering the lower insulating piece 40 to form the positioning groove 41b corresponding to the area of the positioning groove 14b, the groove bottom of the positioning groove 14b away from the top surface 12 can be embedded in the positioning groove 41b; in this way, the positioning protrusion 31b on the upper insulating piece 30 is embedded in the positioning groove 14b as a matching part, and the groove bottom of the positioning groove 14b is embedded in the positioning groove 41b again, ensuring that the upper insulating piece 30 and the lower insulating piece 40 are positioned on the opposite sides of the cover plate 10, respectively, and avoiding rotation. By the cooperation of the positioning groove 41b, the positioning groove 14b, and the positioning protrusion 31b from bottom to top, the gap between the lower insulating piece 40 and the cover plate 10 caused by the limiting groove 14a can be avoided, ensuring that the lower insulating piece 40 and the cover plate 10 can be kept in a state of close contact, facilitating assembly.

[0127] In some possible embodiments, referring to FIGS. 8, 9 and 12, the top surface 12 of the cover plate 10 has at least two positioning protrusions 14c formed by locally protruding upward in the area corresponding to the upper insulating member 30; all the positioning protrusions 14c are distributed on the side of the pole hole 11; and the bottom end of each positioning protrusion 14c is recessed inward to form an empty slot 14d.

[0128] Thus, the positioning protrusions 14c protruding upward from the top surface 12 can serve as the positioning portion 14; the fixing recesses 31c recessed inward from the bottom surface of the upper insulating member 30 facing the top surface 12 can serve as the cooperating portion; the positioning protrusions 14c and the fixing recesses 31c are embedded and fixed to achieve the relative fixing of the cover plate 10 and the upper insulating member 30 in the circumferential direction; further, the rivet 22 fixed relative to the upper insulating member 30 can be kept relative fixed with the cover plate 10 in the circumferential direction, so that the pole 20 can be effectively fixed after the assembly of the end cover 122 of the battery monomer 121 is completed, and the rotation of the pole 20 is prevented.

[0129] The fixing recesses 31c can be circular, square, triangular or other shapes in the thickness direction projection, and the upper insulating member 30 can be integrally formed with the corresponding fixing recesses 31c by injection molding, so as to be positioned by cooperating with the positioning protrusions 14c.

[0130] The positioning protrusions 14c can be designed according to the shape of the fixing recesses 31c to be cooperated, which can be circular, square, triangular or other shapes in the thickness direction projection, and the depth of the positioning protrusions 14c in the thickness direction should be greater than the thickness of the cover plate 10. Specifically, the protrusions protruding toward the side of the rivet 22 can be formed on the cover plate 10 by stamping process, which is good in process and low in cost.

[0131] The bottom surface 13 of the cover plate 10 is formed with a third step 16c, and the third step 16c is arranged at the slot opening of the empty slot 14d.

[0132] The bottom end of each positioning protrusion 14c is recessed inward to form an empty slot 14d; by arranging the third step 16c at the slot opening of the empty slot 14d, especially in the stamping process, the stamping size of the positioning protrusion 14c can be more full, which is beneficial to reduce the size error, so as to facilitate the embedding of the positioning protrusion 14c and the fixing recess 31c to achieve the circumferential fixing, and further effectively fix the pole 20 on the cover plate 10 to prevent the rotation of the pole 20.

[0133] In some embodiments, the total depth of the third step 16c is 0.1-0.3 times the thickness T of the cover plate 10, which can be designed as required.

[0134] In some possible embodiments, referring to FIGS. 8, 9 and 12, the end cover 122 comprises a lower insulating member 40 arranged on the bottom surface 13 of the cover plate 10 on the other side along the thickness direction thereof; the lower insulating member 40 is upwardly protruded to form a positioning column 41c at a region corresponding to the air slot 14d, and the air slot 14d and the positioning column 41c are embedded and positioned.

[0135] By upwardly protruding the positioning column 41c at the region of the lower insulating member 40 corresponding to the air slot 14d, the positioning column 41c can be embedded in the air slot 14d and embedded in the fixing groove 31c on the upper insulating member 30 through the positioning bump 14c of the cover plate 10, so as to ensure that the upper insulating member 30 and the lower insulating member 40 are respectively integrally positioned on the opposite sides of the cover plate 10, and rotation is avoided. The positioning is realized through the twice positioning cooperation of the positioning column 41c and the air slot 14d, and the positioning bump 14c and the fixing groove 31c, which can avoid the gap between the lower insulating member 40 and the cover plate 10, ensure that the lower insulating member 40 and the cover plate 10 can maintain the state of being attached, and facilitate assembly.

[0136] In some possible embodiments, referring to FIG. 12, the riveting member 22 is inwardly recessed to form an avoiding hole 22a at a region corresponding to the fixing groove 31c, and the end of the fixing groove 31c away from the cover plate 10 is embedded and positioned with the avoiding hole 22a.

[0137] In this way, the overall distance of the riveting member 22 to the cover plate 10 can be ensured not to change, and the height of the battery monomer 121 as a whole can be effectively controlled.

[0138] In some possible embodiments, referring to FIGS. 5-12, the end cover 122 comprises a sealing ring 50, which is sleeved on the outer periphery of the column body 21, and the two ends of the sealing ring 50 along the thickness direction of the cover plate 10 abut against the upper insulating member 30 and the lower insulating member 40, respectively.

[0139] Specifically, the column body 21 of the pole column 20 comprises a main body part and a limiting part, the main body part is arranged in the pole column hole 11, one end of the main body part is connected with the riveting member 22, and the other end is connected with the limiting part; the limiting part is arranged on the section of the column body 21 on the side of the bottom surface 13, and the diameter of the limiting part is greater than the diameter of the pole column hole 11, so as to prevent the pole column 20 from being separated from the pole column hole 11. The two ends of the sealing ring 50 along the thickness direction of the cover plate 10 abut against the upper insulating member 30 and the lower insulating member 40, respectively, a part of the sealing ring 50 protrudes into the pole column hole 11 and abuts against the upper insulating member 30, and the other part is clamped between the limiting part of the column body 21 and the cover plate 10, so as to realize the insulation and isolation of the pole column 20 and the cover plate 10.

[0140] A second aspect of the embodiments of the present application provides an end cover 122 for use in the battery cell 121 described above.

[0141] The end cover 122 includes a cover plate 10, an upper insulating member 30, and a pole 20. The cover plate 10 is formed with a pole hole 11. The upper insulating member 30 is arranged on a top surface 12 of the cover plate 10 along a thickness direction X of the cover plate 10. The pole 20 is arranged through the pole hole 11 and the upper insulating member 30 in sequence, and a top end of the pole 20 is fixed to the upper insulating member 30. The upper insulating member 30 is rotationally fixed to the cover plate 10.

[0142] A third aspect of the embodiments of the present application provides a battery 100 including at least one battery cell 121 described in the above embodiments.

[0143] A fourth aspect of the present application provides an electric device 1000 including at least one battery 100 described in the above embodiments, and the battery 100 is used to provide electric energy to the electric device 1000.

[0144] The technical features of the above embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictions, they should be considered as the scope of the present application.

[0145] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, however, it should not be understood as a limitation on the patent scope of the present application. It should be pointed out that, for ordinary skilled in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the patent protection scope of the present application should be subject to the appended claims.

Claims

1. A battery cell, comprising: a cover (122) ; a cover plate (10), an upper insulating member (30), and a pole (20) ; the cover plate (10) is formed with a pole hole (11) penetrating therethrough; the upper insulating member (30) is arranged on a top surface (12) of the cover plate (10) on one side along a thickness direction of the cover plate (10) ; the pole (20) is sequentially arranged through the pole hole (11) and the upper insulating member (30), and a top end of the pole (20) is fixed with the upper insulating member (30) ; wherein, the upper insulating member (30) is rotationally fixed with the cover plate (10). The end cap (122) comprises: The first contact point and the second contact point are not equidistant from the axis (11a). 3.The battery cell according to claim 1, wherein the cover plate (10) is formed with a positioning portion (14), and the upper insulating member (30) is formed with a fitting portion adapted to be embedded in the positioning portion (14). One of the positioning portion (14) and the fitting portion is a groove, and the other is a hollow convex. 4.The battery cell according to claim 3, wherein along the thickness direction of the cover plate (10), a ratio of a wall thickness of the positioning portion (14) to a wall thickness of other regions of the cover plate (10) is 0.8-1.2 times. 5.The battery cell according to claim 3, wherein the cover plate (10) is formed with a stepped portion (16), and the stepped portion (16) is annularly arranged at a region of the cover plate (10) close to the positioning portion (14).

2. The battery cell according to claim 1, the pole stub hole (11) having an axis (11a), in at least one plane perpendicular to the axis (11a), the edge of the upper insulator (30) has a first contact point and a second contact point, both in contact with the cover plate (10), wherein, 6.The battery cell according to claim 3, wherein the cover (122) comprises a lower insulating member (40) arranged on a bottom surface (13) of the cover plate (10) on the other side along the thickness direction of the cover plate (10), and the lower insulating member (40) is formed with a fitting portion (41) corresponding to a region of the positioning portion (14), and the positioning portion (14) is limitingly connected with the fitting portion (41). 7.The battery cell according to any one of claims 1-5, wherein a thickness of the cover plate (10) is T, and 0.5mm<T≤1.5mm is satisfied; and / or, the cover plate (10) is made of stainless steel or carbon steel. 8.The battery cell according to any one of claims 1-5, wherein the pole (20) comprises a pole body (21) arranged through the pole hole (11), and a riveting member (22) riveted on a section of the pole body (21) protruding from the top surface (12) to form a top end of the pole (20) ; and the upper insulating member (30) wraps a bottom side surface and at least part of an outer peripheral surface of the riveting member (22). 9.The battery cell according to claim 8, wherein the upper insulating member (30) comprises a bottom plate (32) formed with a through hole (34) for the pole body (21) to pass through, and an annular side wall (33) annularly arranged at an edge of the bottom plate (32) and extending along the thickness direction to wrap the riveting member (22). ​ ​ ​ ​ ​ ​ ​ 10. The battery cell of claim 8, wherein, The top surface (12) of the cover plate (10) is concave downward as a whole to form a limiting groove (14a) corresponding to the area of the upper insulating member (30), and the limiting groove (14a) protrudes from the bottom surface (13) of the cover plate (10) at the bottom end of the top surface (12). The upper insulating member (30) is embedded in the limiting groove (14a) as a whole.

11. The battery cell according to claim 10, wherein a first step (16a) is formed on the top surface (12) of the cover plate (10) and arranged around the opening of the limiting groove (14a).

12. The battery cell according to claim 10, wherein the end cover (122) comprises a lower insulating member (40) arranged on the bottom surface (13) of the cover plate (10) on the other side along the thickness direction thereof; the lower insulating member (40) is concave downward to form an avoiding groove (41a) corresponding to the area of the limiting groove (14a), and the limiting groove (14a) is embedded in the avoiding groove (41a) at the bottom end of the top surface (12).

13. The battery cell according to claim 10, wherein the projection surface of the upper insulating member (30) is triangular, square, elliptical or tooth-shaped in the thickness direction. The riveting member (22) is triangular, square, elliptical or tooth-shaped.

14. The battery cell according to claim 8, wherein the top surface (12) of the cover plate (10) has at least two positioning grooves (14b) formed by local concave downward corresponding to the area of the upper insulating member (30); all the positioning grooves (14b) are distributed on the side of the pole column hole (11); and each positioning groove (14b) protrudes from the bottom surface (13) of the cover plate (10) at the bottom end of the top surface (12). The upper insulating member (30) has at least two positioning protrusions (31b) formed thereon, which are embedded in the positioning grooves (14b) one by one.

15. The battery cell according to claim 14, wherein a second step (16b) is formed on the top surface (12) of the cover plate (10) and arranged around the opening of the positioning groove (14b).

16. The battery cell according to claim 14, wherein the end cover (122) comprises a lower insulating member (40) arranged on the bottom surface (13) of the cover plate (10) on the other side along the thickness direction thereof; the lower insulating member (40) is concave downward to form a positioning groove (41b) corresponding to the area of the positioning groove (14b), and the positioning groove (14b) is embedded in the positioning groove (41b) at the bottom end of the top surface (12).

17. The battery cell of claim 8, wherein the top surface (12) of the cover plate (10) has at least two positioning protrusions (14c) formed locally upward corresponding to the area of the upper insulating member (30); all the positioning protrusions (14c) are distributed on the side of the pole hole (11); and each of the positioning protrusions (14c) has an inner recess (14d) formed at the bottom end away from the top surface (12). The upper insulating member (30) has at least two fixing grooves (31c) formed thereon, and the positioning protrusions (14c) and the fixing grooves (31c) are one-to-one corresponding and embedded.

18. The battery cell of claim 17, wherein the bottom surface (13) of the cover plate (10) has a third step (16c) formed thereon, and the third step (16c) is annularly arranged at the opening of the inner recess (14d).

19. The battery cell of claim 17, wherein the end cover (122) comprises a lower insulating member (40) arranged on the bottom surface (13) of the cover plate (10) on the other side along the thickness direction thereof; the lower insulating member (40) has a positioning column (41c) formed upward corresponding to the area of the inner recess (14d), and the inner recess (14d) and the positioning column (41c) are embedded and positioned.

20. The battery cell of claim 17, wherein the rivet (22) has an avoiding hole (22a) formed by recessing inward corresponding to the area of the fixing groove (31c), and the fixing groove (31c) and the avoiding hole (22a) are embedded and positioned at the end away from the cover plate (10).

21. The battery cell of claim 8, wherein the end cover (122) comprises a sealing ring (50) sleeved on the outer periphery of the pole (21), and the sealing ring (50) abuts against the upper insulating member (30) and the lower insulating member (40) respectively at the two ends along the thickness direction of the cover plate (10).

22. An end cover for the battery cell of any one of claims 1 to 21, comprising: a cover plate (10) having a pole hole (11) formed therethrough; an upper insulating member (30) arranged on the top surface (12) of the cover plate (10) on one side along the thickness direction thereof; and a pole (20) sequentially arranged through the pole hole (11) and the upper insulating member (30), and the top end of the pole (20) is fixed with the upper insulating member (30); wherein the upper insulating member (30) and the cover plate (10) are rotationally stopped.

23. A battery comprising the battery cell of any one of claims 1 to 21.

24. An electric device comprising the battery of claim 23, wherein the battery is used to provide electric energy.

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