Battery monomer, end cover, battery and electric device

Abstract

The utility model relates to a battery monomer, an end cover, a battery and an electric device. The battery monomer comprises the end cover, the end cover comprises a cover plate, an upper insulating part and a pole; a through pole hole is formed in the cover plate; the upper insulating part is arranged on the top surface of one side of the cover plate along the thickness direction of the cover plate; the pole sequentially penetrates through the pole hole and the upper insulating part, and the top end of the pole is fixed with the upper insulating part; and the upper insulating part is in rotation stopping fit with the cover plate. According to the battery monomer, the end cover, the battery and the power utilization device provided by the embodiment of the invention, the pole column can be effectively fixed in the circumferential direction.

Description

Technical Field

[0001] The present application relates to the technical field of batteries, and particularly to a battery cell, an end cover, a battery, and an electrical device. Background Art

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

[0003] However, in the actual application of batteries, the pole column often rotates circumferentially, affecting the use safety. Summary of the Invention

[0004] Based on this, in view of the problem of circumferential fixation of the pole column, it is necessary to provide a battery cell, an end cover, a battery, and an electrical device.

[0005] In a first aspect of an embodiment of the present application, a battery cell is provided. The battery cell includes an end cover. The end cover includes: a cover plate, an upper insulating member, and a pole column. The cover plate is formed with a through pole column hole. The upper insulating member is disposed on the top surface of one side of the cover plate along its thickness direction. The pole column sequentially passes through the pole column hole and the upper insulating member, and the top end of the pole column is fixed to the upper insulating member. Wherein, the upper insulating member is in anti-rotation cooperation with the cover plate.

[0006] By setting the top end of the pole column to be fixed to the upper insulating member and setting the upper insulating member to be in anti-rotation cooperation with the cover plate, the pole column as a whole is kept circumferentially relatively fixed to the cover plate. In this way, on the basis that the thickness of the cover plate is not sufficient to separately provide a fixing structure, it is still possible to effectively fix the pole column after the end cover of the battery cell is assembled, preventing the pole column from rotating.

[0007] In one of the embodiments, the pole column hole has an axis. On at least one plane perpendicular to the axis, the edge of the upper insulating member has a first contact point and a second contact point that are both in contact with the cover plate. Wherein, the distances from the first contact point and the second contact point to the axis are not equal. In this way, by having a first contact point and a second contact point on the edge of the upper insulating member that are both in contact with the cover plate, and confirming that the distances from the first contact point and the second contact point to the axis are not equal; it is thus confirmed that the upper insulating member cannot rotate circumferentially with the axis of the pole column hole as the rotation center.

[0008] In one embodiment, a positioning portion is formed on the cover plate, and a mating portion adapted to be embedded with the positioning portion is formed on the upper insulating member; one of the positioning portion and the mating portion is a groove, and the other is a hollow convex protrusion. In this way, the pole column as a whole can be circumferentially relatively fixed to the cover plate through the positioning portion and the mating portion, so that on the basis that the thickness of the cover plate is not sufficient to separately provide a fixing structure, it is still possible to effectively fix the pole column after the end cover of the battery cell is assembled, preventing it from rotating.

[0009] In one embodiment, along the thickness direction of the cover plate, the wall thickness ratio of the positioning portion to the wall thickness of other regions of the cover plate is 0.8 to 1.2 times. In this way, not only can the strength of the positioning portion be ensured, but also the circumferential relative fixation can be maintained through the positioning portion and the mating portion, thereby ensuring the circumferential relative fixation between the pole column as a whole and the cover plate.

[0010] In one embodiment, a stepped portion is formed on the cover plate, and the stepped portion is disposed around the region of the cover plate close to the positioning portion. By stamping the stepped portion in the region of the cover plate close to the positioning portion, the positioning portion can be stamped more fully, reducing dimensional errors, so as to facilitate the circumferential relative fixation of the positioning portion and the mating portion, and further effectively fix the pole column on the cover plate to prevent it from rotating.

[0011] In one embodiment, the end cover includes a lower insulating member, and the lower insulating member is disposed on the bottom surface of the cover plate on the other side along its thickness direction; a mating portion is formed in the region of the lower insulating member corresponding to the positioning portion, and the positioning portion is in limit connection with the mating portion. By forming a mating portion in the region of the lower insulating member corresponding to the positioning portion, and making the side of the positioning portion away from the top surface in limit connection with the mating portion; the lower insulating member can be limited to the positioning portion, thereby ensuring that the relative positions of the lower insulating member and the cover plate are fixed and preventing rotation; and it can avoid the generation of gaps between the lower insulating member and the cover plate due to the positioning portion, ensuring that the lower insulating member and the cover plate are in a fitting state, which is convenient for assembly.

[0012] In one embodiment, the thickness of the cover plate is T, and it satisfies: 0.5 mm < T ≤ 1.5 mm; and / or, the cover plate is made of stainless steel or carbon steel.

[0013] In one embodiment, the pole column includes a column body and a riveting member, and the column body passes through the pole column hole; the riveting member is riveted on the section of the column body protruding from the top surface to form the top end of the pole column; 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 from the riveting member or the column body to the cover plate can be effectively increased, the risk of leakage and short circuit can be reduced, and the safety of the battery can be improved.

[0014] In one embodiment, the upper insulating member includes a bottom plate and a ring sidewall. The bottom plate is formed with a through hole for the column to pass through. The bottom plate is used to wrap the bottom side surface of the riveting member. The ring sidewall is disposed around the edge of the bottom plate and extends along 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.

[0015] In one embodiment, the top surface of the cover plate corresponding to the area of the upper insulating member is integrally recessed downward 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 provided at the bottom of the limiting groove. The upper insulating member is integrally embedded in the limiting groove. In this way, the area of the top surface of the cover plate corresponding to the upper insulating member is integrally recessed downward to form a limiting groove as a positioning portion, and the upper insulating member as a whole is a matching portion that cooperates with the positioning portion. Through the limiting groove and the overall embedding and fixing of the upper insulating member, the relative fixation of the cover plate and the upper insulating member in the circumferential direction is realized.

[0016] In one embodiment, a first step is formed on the top surface of the cover plate. The first step is disposed around the notch of the limiting groove. By providing a first step in the area near the notch of the limiting groove, the stamping size of the limiting groove is more plump, which is beneficial to reducing dimensional errors, so as to facilitate the fitting of the limiting groove and the upper insulating member to achieve circumferential fixation, and further effectively fix the pole on the cover plate to prevent it from rotating.

[0017] In one embodiment, the end cover includes a lower insulating member. The lower insulating member is disposed on the bottom surface of the cover plate on the other side along its thickness direction. The area of the lower insulating member corresponding to the limiting groove sinks downward to form an avoidance groove. The bottom end of the limiting groove away from the top surface is embedded in the avoidance groove. By sinking the area of the lower insulating member corresponding to the limiting groove downward to form an avoidance groove, the bottom of the limiting groove away from the top surface can be embedded in the avoidance groove. In this way, the upper insulating member as a whole is embedded in the limiting groove as a matching portion, and is re-embedded and positioned through the bottom of the limiting groove and the avoidance groove, so that the upper insulating member and the lower insulating member are respectively positioned on the opposite side surfaces of the cover plate as a whole to avoid rotation.

[0018] In one embodiment, when projected along the thickness direction, the projection surface of the upper insulating member is triangular, square, oval or toothed; and / or, the riveting member is a triangular block, square block, oval block or toothed block.

[0019] In one embodiment, the top surface of the cover plate in the area corresponding to the upper insulating member has at least two positioning grooves formed by local downward depressions; all the positioning grooves are distributed beside the pole hole; the bottom end of each positioning groove away from the top surface protrudes from the bottom surface of the cover plate; at least two positioning protrusions are formed on the upper insulating member as the mating parts, and the positioning protrusions are in one-to-one correspondence and fitted with the positioning grooves. In this way, the positioning grooves formed by downward depressions from the top surface can serve as positioning parts; at the same time, the positioning protrusions protruding outward from the bottom surface of the upper insulating member facing the top surface serve as mating parts; through the embedding and fixing of the positioning grooves and the positioning protrusions, the relative fixation of the cover plate and the upper insulating member in the circumferential direction is achieved.

[0020] In one embodiment, a second step is formed on the top surface of the cover plate, and the second step is arranged around the notch of the positioning groove. In this way, the stamping size of the positioning groove can be made more plump, which is beneficial to reducing dimensional errors, thus facilitating the fitting of the positioning groove and the positioning protrusion to achieve circumferential fixation, and further effectively fixing the pole on the cover plate to prevent it from rotating.

[0021] In one embodiment, the end cover includes a lower insulating member, and the lower insulating member is arranged on the bottom surface of the cover plate on the other side along its thickness direction; the area of the lower insulating member corresponding to the positioning groove sinks downward to form a positioning slot, and the bottom end of the positioning groove away from the top surface is embedded in the positioning slot. In this way, the positioning protrusion on the upper insulating member is embedded in the positioning groove as a mating part, and is re-embedded through the bottom of the positioning groove and the positioning slot to ensure that the upper insulating member and the lower insulating member are respectively positioned on the opposite side surfaces of the cover plate as a whole, avoiding rotation.

[0022] In one embodiment, the top surface of the cover plate in the area corresponding to the upper insulating member has at least two positioning bumps formed by local upward protrusions; all the positioning bumps are distributed beside the pole hole; the bottom end of each positioning bump away from the top surface is recessed inward to form an empty slot; at least two fixing grooves are formed on the upper insulating member, and the positioning bumps are in one-to-one correspondence and fitted with the fixing grooves. In this way, the riveting part relatively fixed to the upper insulating member can maintain circumferential relative fixation with the cover plate, and finally a state of preventing rotation between the whole pole and the cover plate is achieved. Thus, on the basis that the thickness of the cover plate is not enough to separately set a fixing structure, it can still be ensured that the pole can be effectively fixed after the assembly of the end cover of the battery cell is completed to prevent it from rotating.

[0023] In one embodiment, a third step is formed on the bottom surface of the cover plate, and the third step is disposed around the notch of the empty groove. In this way, the stamping size of the positioning lug can be made more full, which is beneficial to reducing dimensional errors, thus facilitating the fitting of the positioning lug and the fixing groove to achieve circumferential fixation, and further effectively fixing the pole column on the cover plate to prevent it from rotating.

[0024] In one embodiment, the end cover includes a lower insulating member, and the lower insulating member is disposed on the bottom surface of the cover plate on the other side along its thickness direction; a positioning post is formed by protruding upward in the area of the lower insulating member corresponding to the empty groove, and the empty groove and the positioning post are inserted and positioned.

[0025] In one embodiment, an avoidance hole is formed by inwardly recessing in the area of the riveting member corresponding to the fixing groove, and the end of the fixing groove away from the cover plate and the avoidance hole are inserted and positioned. By realizing positioning through the two positioning fits of the positioning post and the empty groove, and the positioning lug and the fixing groove, gaps can be avoided between the lower insulating member and the cover plate, ensuring that the lower insulating member and the cover plate can remain in a fitting state, which is convenient for assembly.

[0026] In one embodiment, the end cover includes a sealing ring, the sealing ring is sleeved on the outer periphery of the column body, and both ends of the sealing ring along the thickness direction of the cover plate are respectively abutted against the upper insulating member and the lower insulating member. In this way, insulation isolation between the pole column and the cover plate can be achieved.

[0027] A second aspect of the embodiments of the present application provides an end cover for use in the above-mentioned battery cell. The end cover includes: a cover plate, formed with a through pole column hole; an upper insulating member, disposed on the top surface of the cover plate on one side along its thickness direction; and a pole column, sequentially passing through the pole column hole and the upper insulating member, and the top end of the pole column is fixed to the upper insulating member; wherein, the upper insulating member and the cover plate are in anti-rotation cooperation.

[0028] A third aspect of the embodiments of the present application provides a battery, including the above-mentioned battery cell.

[0029] A fourth aspect of the embodiments of the present application provides an electrical device, including the above-mentioned battery, and the battery is used to provide electrical energy.

[0030] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically given below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic structural diagram of a vehicle provided for some embodiments of the present application.

[0032] Figure 2 Exploded view of a battery provided for some embodiments of the present application.

[0033] Figure 3 Structural diagram of a battery module provided for some embodiments of the present application.

[0034] Figure 4 Exploded view of a battery cell provided for some embodiments of the present application.

[0035] Figure 5 Exploded view of an end cap provided for some embodiments of the present application.

[0036] Figure 6 Top view of an end cap provided for some embodiments of the present application.

[0037] Figure 7 For Figure 6 A - A cross - sectional view of the shown end cap.

[0038] Figure 8 Exploded view of an end cap provided for other embodiments of the present application.

[0039] Figure 9 Top view of an end cap provided for other embodiments of the present application.

[0040] Figure 10 For Figure 9 B - B cross - sectional view of the shown end cap in one embodiment.

[0041] Figure 11 For Figure 10 Structural diagram of the shown upper insulating part.

[0042] Figure 12 For Figure 9 B - B cross - sectional view of the shown end cap in another embodiment.

[0043] Explanation of reference numerals:

[0044] Vehicle - 1000;

[0045] Battery - 100, Box - 110, First part - 111, Second part - 112, Battery module - 120, Battery cell - 121, End cap - 122, Housing - 123, Electrode assembly - 124, Controller - 200, Motor - 300;

[0046] Cover plate - 10, pole 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, stepped part - 16, first step - 16a, second step - 16b, third step - 16c, pole - 20, column body - 21, riveting part - 22, avoidance hole - 22a, upper insulating part - 30, positioning protrusion - 31b, fixing groove - 31c, bottom plate - 32, annular side wall - 33, through hole - 34, lower insulating part - 40, fitting part - 41, avoidance groove - 41a, positioning groove - 41b, positioning column - 41c, sealing ring - 50;

[0047] Thickness direction - X. Specific embodiments

[0048] 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 illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above - mentioned drawings are intended to cover non - exclusive inclusion.

[0050] In the description of the embodiments of the present application, if technical terms such as "first" and "second" appear, these terms are only for descriptive purposes to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary - secondary relationship of the indicated technical features.

[0051] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0052] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0053] In the description of the embodiments of the present application, if the term "plurality" appears, the meaning of "plurality" is at least two (including two), such as two, three, etc., unless otherwise specifically defined. Similarly, if the term "multiple groups" appears, "multiple groups" means more than two groups (including two groups), and if the term "multiple pieces" appears, "multiple pieces" means more than two pieces (including two pieces).

[0054] In the description of the embodiments of the present application, if terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or positional relationship indicated by these terms is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the embodiments of the present application.

[0055] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, if technical terms such as "installation", "connection", "connection", "fixation", etc. appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0056] In the present application, unless otherwise clearly specified and limited, if a description such as a first feature being "on" or "under" a second feature appears, its meaning can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0057] It should be noted that if an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. If an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are only for the purpose of illustration and do not represent the only implementation.

[0058] At present, from the perspective of the development of the market situation, the application of power batteries is becoming more and more extensive. Power batteries are not only applied to energy storage power systems such as hydropower, thermal power, wind power and solar power plants, but also widely applied to electric transportation tools such as electric bicycles, electric motorcycles, electric vehicles, as well as multiple fields such as aerospace. With the continuous expansion of the application fields of power batteries, the market demand is also continuously increasing.

[0059] In the related art, the end cover of a battery cell mainly includes a cover plate, a pole column assembled on the cover plate, an upper insulating member for insulating the pole column from the cover plate, etc. In order to ensure the positioning effect of the pole column, the upper insulating member and the cover plate and prevent rotation between the pole column, the plastic part and the cover plate, grooves are often designed on the cover plate and the pole column; the anti-rotation function is realized by passing a ceramic column through the grooves on the cover plate and the pole column; however, with this structure, the cover plate needs to have sufficient thickness to set the above-mentioned ceramic column, which results in that some battery end covers with thinner cover plates cannot effectively design an anti-rotation structure.

[0060] In order to improve the problem of circumferential fixation between a thinner cover plate and a pole column, the upper insulating member and the cover plate can be first stopped from rotating, so as to circumferentially fix the upper insulating member and the cover plate, and the upper insulating member and the top end of the pole column are fixed, so as to circumferentially fix the pole column and the cover plate, ensuring effective anti-rotation.

[0061] The embodiments of the present application provide a battery cell, an end cover, a battery and an electrical device. The electrical device can be but is not limited to mobile phones, tablets, laptop computers, electric toys, electric tools, battery cars, electric vehicles, ships, spacecrafts, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys and electric aircraft toys, etc., and the spacecraft can include airplanes, rockets, space shuttles and spaceships, etc.

[0062] It should be understood that the technical solutions described in the embodiments of the present application are not only limited to the above-described batteries and electrical devices, but also applicable to all batteries including boxes and electrical devices using batteries. However, for the sake of simplicity of description, a vehicle 1000 is taken as an example of an electrical device in the embodiments of the present application for illustration.

[0063] Please refer toFigure 1 , Figure 1 The structural schematic diagram of vehicle 1000 provided by some embodiments of the present application. Vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is disposed inside vehicle 1000, and the battery 100 can be disposed at the bottom, head or tail of vehicle 1000. The battery 100 can be used for power supply of vehicle 1000. For example, the battery 100 can be used as the operating power source of vehicle 1000. Vehicle 1000 may 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, it is used for the working power consumption requirements during the start, navigation and driving of vehicle 1000.

[0064] In some embodiments of the present application, the battery 100 can not only be used as the operating power source of vehicle 1000, but also be used as the driving power source of vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for vehicle 1000.

[0065] Figure 2 The explosion diagram of battery 100 provided by some embodiments of the present application; Figure 3 The structural schematic diagram of the battery module provided by some embodiments of the present application. Please refer to Figure 2 and Figure 3 , in order to meet different power consumption requirements, the battery 100 may include a plurality of battery cells 121 and a box body 110. The battery cell 121 refers to the smallest unit that makes up the battery module 120 or the battery pack. The plurality of battery cells 121 are connected in series and / or in parallel together for various application scenarios. The box body 110 is used to accommodate the battery cells 121 or the battery module 120 to prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells 121.

[0066] The housing 110 can adopt various structures. In some embodiments, the housing 110 can include a first part 111 and a second part 112. The first part 111 and the second part 112 cover each other, and the first part 111 and the second part 112 jointly define a receiving 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-like structure. The first part 111 covers the open side of the second part 112 so that the first part 111 and the second part 112 jointly define the receiving space; the first part 111 and the second part 112 can also 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 housing 110 formed by the first part 111 and the second part 112 can be of various shapes. For example, it can be a simple three-dimensional structure such as a single cuboid, cylinder, or sphere, or it can be a complex three-dimensional structure composed of combinations of simple three-dimensional structures such as cuboids, cylinders, or spheres. The embodiments of the present application do not limit this. The material of the housing 110 can be alloy materials such as aluminum alloy and ferroalloy, or polymer materials such as polycarbonate and polyisocyanurate foam, or composite materials such as glass fiber reinforced epoxy resin. The embodiments of the present application also do not limit this.

[0067] In the embodiments of the present application, multiple battery cells 121 can directly form a battery pack, or they can first form a battery module 120, and then the battery modules 120 form a battery pack. Specifically, multiple battery cells 121 can be directly connected in series, parallel, or in a mixed connection to form an integral body, and then the integral body formed by the multiple battery cells 121 is accommodated in the housing 110. It can also be that multiple battery cells 121 are first connected in series, parallel, or in a mixed connection to form a battery module 120, and then multiple battery modules 120 are connected in series, parallel, or in a mixed connection to form an integral body and are accommodated in the housing 110.

[0068] The battery 100 can also include other structures. For example, the battery 100 can also include a busbar component for realizing electrical connection between multiple battery cells 121.

[0069] Each battery cell 121 can be a secondary battery or a primary battery; it 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 the shape of a cylinder, a flat body, a cuboid, or other shapes, etc. The battery cells 121 are generally divided into three types according to the encapsulation method: cylindrical battery cells, square battery cells, and soft-pack battery cells. The embodiments of the present application do not limit this either. However, for the sake of simplicity of description, in the following embodiments, the square lithium-ion battery cells 121 are taken as examples for illustration.

[0070] Please refer to Figure 4 , Figure 4Exploded structural schematic diagram of battery cell 121 provided by some embodiments of the present application. The battery cell 121 includes an end cap 122, a housing 123, an electrode assembly 124, and other functional components.

[0071] The end cap 122 refers to a component that covers the opening of the housing 123 to isolate the internal environment of the electrode assembly 124 from the external environment. Without limitation, the shape of the end cap 122 can be adapted to the shape of the housing 123 to cooperate with the housing 123. Optionally, the end cap 122 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, the end cap 122 is not easily deformed when subjected to extrusion and collision, enabling the battery cell 121 to have higher structural strength and improved safety performance. Functional components such as terminal posts can be provided on the end cap 122. The terminal posts can be used to electrically connect to the electrode assembly 124 for outputting or inputting the electrical energy of the battery cell 121. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 121 reaches a threshold can also be provided on the end cap 122. In some embodiments, an insulating member can also be provided on the inner side of the end cap 122. The insulating member can be used to isolate the electrical connection components in the housing 123 from the end cap 122 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0072] The housing 123 is a component used to cooperate with the end cap 122 to form the internal environment of the battery cell 121. Among them, the formed internal environment can be used to accommodate the electrode assembly 124, the electrolyte, and other components. The housing 123 and the end cap 122 can be independent components. An opening can be provided on the housing 123, and the end cap 122 is covered at the opening to form the internal environment of the battery cell 121. Without limitation, the end cap 122 and the housing 123 can also be integrated. Specifically, the end cap 122 and the housing 123 can first form a common connection surface before other components are put into the housing. When it is necessary to encapsulate the inside of the housing 123, the end cap 122 is then covered on the housing 123. The housing 123 can be in various shapes and sizes, such as rectangular parallelepiped, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 123 can be determined according to the specific shape and size of the electrode assembly 124. The material of the housing 123 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The embodiments of the present application do not make special limitations on this.

[0073] The electrode assembly 124 is a component in the battery cell 121 where an electrochemical reaction occurs. The housing 123 may contain one or more electrode assemblies 124. The electrode assembly 124 is mainly formed by winding or laminating a positive electrode plate and a negative electrode plate, and a separator is usually provided between the positive electrode plate and the negative electrode plate. The portions of the positive electrode plate and the negative electrode plate having active materials constitute the main body of the electrode assembly 124, and the portions of the positive electrode plate and the negative electrode plate without active materials respectively constitute pole ears (not shown). The positive pole ear and the negative pole ear may be located together at one end of the main body or separately at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the pole ears are connected to the terminal posts to form a current loop.

[0074] Figure 5 Schematic exploded view of the end cap provided by some embodiments of the present application; Figure 6 Top view of the end cap provided by some embodiments of the present application; Figure 7 is Figure 6 A - A cross - sectional view of the shown end cap; Figure 8 Schematic exploded view of the end cap provided by some other embodiments of the present application; Figure 9 Top view of the end cap provided by some other embodiments of the present application; Figure 10 is Figure 9 B - B cross - sectional view of the shown end cap in one embodiment; Figure 11 is Figure 10 Schematic structure view of the shown upper insulating part; Figure 12 is Figure 9 B - B cross - sectional view of the shown end cap in another embodiment.

[0075] The first aspect of the present application provides a battery cell 121.

[0076] Referring to Figures 1 to 12 As shown, the battery cell 121 includes an end cap 122, a housing 123, and an electrode assembly 124. The end cap 122 covers the opening of the housing 123 to form an internal environment for accommodating the electrode assembly 124.

[0077] The end cap 122 includes a cover plate 10, an upper insulating part 30, and a terminal post 20. The cover plate 10 is formed with a through terminal post hole 11. The upper insulating part 30 is disposed on the top surface 12 of the cover plate 10 on one side in the thickness direction X thereof. The terminal post 20 sequentially passes through the terminal post hole 11 and the upper insulating part 30, and the top end of the terminal post 20 is fixed to the upper insulating part 30. The upper insulating part 30 is in anti - rotation fit with the cover plate 10.

[0078] Among them, the cover plate 10 has a top surface 12 and a bottom surface 13 that are oppositely arranged along its thickness direction X; the bottom surface 13 of the cover plate 10 refers to the side surface of the cover plate 10 facing the inside of the housing 123 when the end cover 122 covers the opening of the housing 123 of the battery cell 121; correspondingly, the top surface 12 of the cover plate 10 is the other side surface facing away from the inside of the housing 123. In each embodiment of the present application, the cover plate 10 can be made of a material with a certain hardness and strength. Exemplarily, the cover plate 10 can be made of stainless steel or carbon steel. In addition, the cover plate 10 can also be made of high-strength alloy steel of other materials according to needs, and the embodiments of the present application do not make special restrictions on this. The pole hole 11 penetrates through the cover plate 10 along the thickness direction X of the cover plate 10, facilitating the fixation with the pole 10.

[0079] The upper insulating member 30 is used to isolate the electrical connection between the pole 10 and the cover plate 10. In the embodiments of the present application, the upper insulating member 30 can be a hollow structure with one end open, and the material of the upper insulating member 30 can be plastic, rubber, etc., and the embodiments of the present application do not make special restrictions on this. The side of the upper insulating member 30 facing away from the cover plate 10 is fixed to the top end of the pole 20. The specific fixing method can be fixed by partially wrapping the outer peripheral side of the top end of the pole 20, or corresponding teeth and grooves can be provided for fixing, or it can be directly fixed by injection molding. The upper insulating member 30 is arranged on the top surface 12 on one side of the cover plate 10 along its thickness direction X, the upper insulating member 30 covers the area of the cover plate 10 where the pole hole 11 is provided, and a through hole 34 corresponding to the pole hole 11 is also formed on the upper insulating member 30 for the pole 20.

[0080] The pole 20 is an element for inputting or outputting electrical energy in the battery cell 121. The pole 20 sequentially passes through the pole hole 11 and the upper insulating member 30, that is, the pole 20 passes through the pole hole 11 and the through hole 34. Among them, the top end of the pole 20 protrudes from the top surface 12 on one side along the thickness direction Z of the cover plate 10, and the bottom end of the pole 20 can be electrically connected to the electrode assembly 124 through a transfer plate. During the charging and discharging process of the battery, the positive and negative active substances in the electrode assembly 124 react with the electrolyte, and the tab of the electrode assembly 124 can be connected to the pole 20 through a transfer plate to form a current loop. The pole 20 is a conductive material part, including but not limited to copper material, aluminum material or other alloy materials.

[0081] By setting the top end of the pole 20 to be fixed to the upper insulating member 30 and setting the upper insulating member 30 to be rotationally stopped with the cover plate 10, the pole 20 is kept circumferentially relatively fixed with the cover plate 10 as a whole. In this way, on the basis that the thickness of the cover plate 10 is not sufficient to separately set a fixing structure, it is still possible to effectively fix the pole 20 after the end cover 122 of the battery cell 121 is assembled, preventing the pole 20 from rotating.

[0082] It can be understood that the end cover 122 includes two pole posts 20. One of the two pole posts 20 serves as the positive electrode of the battery cell 121, and the other serves as the negative electrode of the battery cell 121. Correspondingly, the cover plate 10 is provided with two pole post holes 11 to respectively correspond to the two pole posts 20. Similarly, the end cover 122 includes two upper insulating members 30 to respectively cover the areas where the two pole post holes 11 are provided on the cover plate 10 and cooperate with the two pole posts 20 respectively. The pole post 20 in the embodiment of the present application can be a negative pole post or a positive pole post.

[0083] Optionally, the cover plate 10 may be integrally in a thin plate structure. The thickness of the cover plate 10 is T, and it satisfies: 0.5 mm < T ≤ 1.5 mm. As an example, the wall thickness T of other areas of the cover plate 10 may be but 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 may be set to 0.8 mm ≤ T ≤ 1.2 mm to ensure better structural strength and stamping characteristics.

[0084] In some possible embodiments, referring to Figures 5 to 12 As shown, the pole post hole 11 has an axis 11a. On at least one plane perpendicular to the axis 11a, the edge of the upper insulating member 30 has a first contact point and a second contact point that are both in contact with the cover plate 10. Among them, the distances between the first contact point and the second contact point and the axis 11a are not equal.

[0085] In this way, through the edge of the upper insulating member 30 having a first contact point and a second contact point that are both in contact with the cover plate 10, and confirming that the distances between the first contact point and the second contact point and the axis 11a are not equal; that is to say, the distance from the edge of the upper insulating member 30 to the axis 11a is not a circle with equal distances everywhere, so as to confirm that the upper insulating member 30 cannot rotate circumferentially with the axis 11a of the pole post hole 11 as the rotation center.

[0086] Optionally, when projected along the extending direction of the axis 11a, the upper insulating member 30 in the embodiment of the present application is a semi - circle, rectangle, square, triangle, rhombus, etc.

[0087] In some possible embodiments, referring to Figures 5 to 12 As shown, a positioning portion 14 is formed on the cover plate 10, and a mating portion adapted to be embedded with the positioning portion 14 is formed on the upper insulating member 30. The positioning portion 14 and the mating portion achieve anti - rotation cooperation between the upper insulating member 30 and the cover plate 10 through an interference - fit manner.

[0088] Specifically, one of the positioning portion 14 and the mating portion is a groove, and the other is a hollow boss; in this way, the entire pole column 20 and the cover plate 10 can be circumferentially relatively fixed through the positioning portion 14 and the mating portion, so that on the basis that the thickness of the cover plate 10 is not sufficient to separately provide a fixing structure, it is still possible to ensure that the pole column 20 can be effectively fixed after the end cover 122 of the battery cell 121 is assembled, preventing it from rotating.

[0089] In some possible embodiments, referring to Figures 5 to 12 As shown, along the thickness direction X of the cover plate 10, the ratio of the wall thickness of the positioning portion 14 to the wall thickness of other regions of the cover plate 10 is 0.8 to 1.2 times. Among them, other regions refer to the regions of the cover plate 10 excluding the positioning portion 14.

[0090] The wall thickness of the positioning portion 14 is integrally connected to other regions of the cover plate 10, and the cover plate 10 can be formed with the positioning portion 14 through a stamping and stretching process. In this way, the wall thickness of the region where the positioning portion 14 is located generally does not change significantly compared to other regions of the cover plate 10. Especially when the wall thickness of the cover plate 10 is relatively thin and it is impossible to form a positioning groove or protrusion on the cover plate 10 by turning or milling, the positioning portion 14 can be stamped on the cover plate 10 through stamping, and the thickness will not change too much, which can not only ensure the strength of the positioning portion 14, but also keep the circumferential relative fixation through the positioning portion 14 and the mating portion, thereby ensuring the circumferential relative fixation between the entire pole column 20 and the cover plate 10.

[0091] Optionally, the wall thickness of other regions of the cover plate 10 is generally T, 0.5 mm < T ≤ 1.5 mm. As an example, the wall thickness T of other regions of the cover plate 10 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. The wall thickness of the positioning portion 14 is generally about 0.8T to 1.2T.

[0092] In some possible embodiments, referring to Figures 5 to 12 As shown, a stepped portion 16 is formed on the cover plate 10, and the stepped portion 16 is disposed around the region of the cover plate 10 close to the positioning portion 14.

[0093] In the stamping process, by stamping the stepped portion 16 in the region of the cover plate 10 close to the positioning portion 14, the positioning portion 14 can be stamped more fully, reducing dimensional errors, so as to facilitate the circumferential relative fixation of the positioning portion 14 and the mating portion, and further effectively fix the pole column 20 on the cover plate 10 to prevent it from rotating.

[0094] In some possible embodiments, referring to Figures 5 to 12As shown, the end cover 122 includes a lower insulating member 40, which is arranged on the bottom surface 13 of the cover plate 10 on the other side of its thickness direction; a matching portion 41 is formed in the area of ​​the lower insulating member 40 corresponding to the positioning portion 14, and the side of the positioning portion 14 away from the top surface 12 is limitedly connected to the matching portion 41.

[0095] The lower insulating member 40 may be a thin plate structure as a whole, and the shape and area of ​​the lower insulating member 40 are substantially the same as those of the cover plate 10. The lower insulating member 40 may be attached as a whole to the bottom surface 13 of the cover plate 10 on the other side along the thickness direction thereof. The lower insulating member 40 may be used to isolate the pole 20 from the cover plate 10, and the cover plate 10 from other electrical connection components in the housing 123, thereby effectively reducing the risk of short circuit. Exemplarily, the lower insulating plate 30 may be plastic, rubber, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0096] By forming a matching portion 41 in the area of ​​the lower insulating member 40 corresponding to the positioning portion 14, and making the side of the positioning portion 14 away from the top surface 12 connected to the matching portion 41 in a limiting manner; the lower insulating member 40 can be limited by the positioning portion 14, thereby ensuring that the relative positions of the lower insulating member 40 and the cover plate 10 remain fixed and avoid rotation; and it can avoid the formation of a gap between the lower insulating member 40 and the cover plate 10 due to the positioning portion 14, ensuring that the lower insulating member 40 and the cover plate 10 remain in a fitted state, which is convenient for assembly.

[0097] It is understandable that in order to allow the pole 20 to pass through, a through hole (not shown) corresponding to the pole hole 11 is also formed on the lower insulating member 40 , so that the pole 20 can pass through the lower insulating member 40 , the pole hole 11 and the upper insulating member 30 in sequence.

[0098] In some possible embodiments, see Figures 5 to 12 As shown, the pole 20 includes a column 21 and a rivet 22. The column 21 is inserted into the pole hole 11. The rivet 22 is riveted on the section of the column 21 protruding from the top surface 12 to form the top of the pole 20. The upper insulating member 30 wraps the bottom side and at least part of the outer peripheral surface of the rivet 22.

[0099] The rivet 22 may be a disc-shaped structure as a whole, and a rivet hole (not shown) is provided in the middle thereof to match the column 21. The column 21 is a column structure extending along the thickness direction X as a whole, and the diameter of the section of the column 21 on the side of the bottom surface 13 is larger than the diameter of the pole hole 11; the section of the column 21 protruding from the top surface 12 is inserted into the rivet hole of the rivet 22 and fixed by riveting, so that the rivet 22 and the column 21 are formed into a whole.

[0100] In each embodiment of the present application, both the riveting member 22 and the column 21 can be made of a metal conductive material with a certain hardness and strength; the materials of the riveting member 22 and the column 21 can be the same or different, such as one or several of materials such as copper, iron, aluminum, stainless steel, aluminum alloy, etc., and the embodiments of the present application do not make special restrictions on this.

[0101] The riveting member 22 is riveted on the section of the column 21 protruding from the top surface 12 of the cover plate 10 along its thickness direction to form the top end of the pole column 20; the upper insulating member 30 wraps the bottom side surface and at least part of the outer peripheral surface of the riveting member 22. In this way, the creepage distance from the riveting member 22 or the column 21 to the cover plate 10 can be effectively lengthened, the risk of leakage and short circuit can be reduced, and the safety of the battery is improved.

[0102] In some possible embodiments, refer to Figures 5 to 12 As shown, the upper insulating member 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 21 to pass through; the bottom plate 32 is used to wrap the bottom side surface of the riveting member 22; the ring side wall 33 is arranged around the edge of the bottom plate 32 and extends along the thickness direction X to wrap the riveting member 22.

[0103] Among them, the bottom plate 32 and the ring side wall 33 together form 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 provided, and a through hole 34 corresponding to the pole column hole 11 is formed on the bottom plate 32 for the column 21 to pass through; the section of the column 21 passing out of the through hole 34 is riveted and fixed to the riveting member 22; the ring side wall 33 wraps around the outer peripheral side surface of the riveting member 22, and the bottom plate 32 is isolated between the riveting member 22 and the bottom plate 10. In this way, the electrical connection between the riveting member 22 and the cover plate 10 can be effectively isolated. Together with other insulating structures, such as the lower insulating member 40, the sealing ring 50 (mentioned below), the electrical connection between the pole column 20 and the cover plate 10 can be effectively isolated to prevent leakage of electricity and liquid.

[0104] Optionally, the bottom plate 32 and the ring side wall 33 can be integrally connected, and both are made of materials such as plastic and rubber.

[0105] In some possible embodiments, refer to Figures 5 to 7 As shown, the top surface 12 of the cover plate 10 corresponding to the area of the upper insulating member 30 is integrally recessed downward to form a limiting groove 14a. The bottom end of the limiting groove 14a away from the top surface 12 protrudes from the bottom surface 13 of the cover plate 10. The pole column hole 11 is arranged at the bottom of the limiting groove 14a; the upper insulating member 30 is integrally embedded in the limiting groove 14a to achieve circumferential limitation.

[0106] Thus, the top surface 12 of the cover plate 10 corresponding to the area of the upper insulating part 30 is integrally sunken downward to form a limiting groove 14a as the positioning part 14. The upper insulating part 30 as a whole serves as a mating part that mates with the positioning part 14, and is fixedly embedded through the limiting groove 14a and the upper insulating part 30 as a whole, so as to realize the relative fixation of the cover plate 10 and the upper insulating part 30 in the circumferential direction. Furthermore, the riveting part 22 relatively fixed to the upper insulating part 30 can maintain circumferential relative fixation with the cover plate 10, and finally the whole pole column 20 and the cover plate 10 are in a state of anti-rotation. Thus, on the basis that the thickness of the cover plate 10 is not sufficient to separately provide a fixing structure, it is still possible to ensure that the pole column 20 can be effectively fixed after the end cover 122 of the battery cell 121 is assembled, preventing it from rotating.

[0107] It should be noted that since the limiting groove 14a is not a simple blind hole, but a structure sunken by integral stamping, the thickness of the bottom of the limiting groove 14a is equal to or not much different from the thickness of other areas of the cover plate 10. Thus, the bottom end of the limiting groove 14a far from the top surface 12 protrudes from the bottom surface 13 of the cover plate 10; this also enables the riveting part 22 and the upper insulating part 30 to sink relative to the cover plate 10 as a whole, and further enables the height of the pole column 20 relative to the cover plate 10 to be controlled, and effectively controls the overall height of the battery cell 121.

[0108] In some possible embodiments, referring to Figures 5 to 7 As shown, at least part of the upper insulating part 30 is received in the limiting groove 14a, so that in the direction perpendicular to the thickness direction, the upper insulating part 30 is limited between the riveting part 22 and the inner wall of the limiting groove 14a.

[0109] By providing the limiting groove 14a to limit the upper insulating part 30 between the riveting part 22 and the inner wall of the limiting groove 14a, the upper insulating part 30 can be reliably limited, thus avoiding misalignment caused by the influence of external equipment, and further reducing the risk of short circuit.

[0110] In some possible embodiments, referring to Figures 5 to 7 As shown, a first step 16a is formed on the top surface 12 of the cover plate 10, and the first step 16a is arranged around the notch of the limiting groove 14a.

[0111] By providing the first step 16a in the area near the notch of the limiting groove 14a, especially in the stamping process, the stamping size of the limiting groove 14a can be made more full, which is beneficial to reducing dimensional errors, thus facilitating the fitting of the limiting groove 14a and the upper insulating part 30 to achieve circumferential fixation, and further effectively fixing the pole column 20 on the cover plate 10 to prevent it from rotating.

[0112] Optionally, the overall depth of the first step 16a is 0.1 to 0.3 times the thickness T of the cover plate 10, and specifically, it can be designed according to the requirements.

[0113] In some possible embodiments, referring to Figures 5 to 7 As shown, the end cover 122 includes a lower insulating member 40, and the lower insulating member 40 is disposed on the bottom surface 13 on the other side of the cover plate 10 along its thickness direction; the area of the lower insulating member 40 corresponding to the limiting groove 14a sinks downward to form an avoidance groove 41a, and the bottom end of the limiting groove 14a away from the top surface 12 is embedded in the avoidance groove 41a.

[0114] The lower insulating member 40 can be integrally in a thin plate structure, and the shape and area of the lower insulating member 40 are basically the same as those of the cover plate 10. The lower insulating member 40 can be integrally attached to the bottom surface 13 on the other side of the cover plate 10 along its thickness direction. The lower insulating member 40 can be used to isolate the pole column 20 from the cover plate 10 and other electrical connection components in the housing 123, thereby effectively reducing the risk of short circuit. Exemplarily, the lower insulating plate 30 can be plastic, rubber, etc., and the embodiments of the present application do not make special limitations on this.

[0115] By sinking the area of the lower insulating member 40 corresponding to the limiting groove 14a downward to form the avoidance groove 41a, the bottom of the limiting groove 14a away from the top surface 12 can be embedded in the avoidance groove 41a. In this way, the upper insulating member 30 as a whole is embedded in the limiting groove 14a as a fitting portion, and is re-embedded and positioned through the bottom of the limiting groove 14a and the avoidance groove 41a, so that the upper insulating member 30 and the lower insulating member 40 are respectively positioned on the opposite side surfaces of the cover plate 10 as a whole, avoiding rotation; and it can avoid generating a gap between the lower insulating member 40 and the cover plate 10 due to the limiting groove 14a, ensuring that the lower insulating member 40 and the cover plate 10 can maintain a fitting state, which is convenient for assembly.

[0116] In some possible embodiments, referring to Figures 5 to 12 As shown, when projected along the thickness direction X, the projection surface of the upper insulating member 30 can be triangular, square, elliptical or toothed; without limitation, the projection surface of the upper insulating member 30 can also be any non-circular shape; in this way, by controlling the shape of the upper insulating member 30 and matching it with the limiting groove 14a, it can be ensured that the upper insulating member 30 cannot rotate circumferentially with the axis 11a of the pole column hole 11 as the rotation center.

[0117] Optionally, the upper insulating member 30 is formed into a housing structure with one end open and can partially wrap the riveting member 22. The internal cavity of the upper insulating member 30 can be correspondingly formed into a triangle, square, ellipse or toothed shape. In this way, the riveting member 22 is also designed as a triangular block, square block, elliptical block or toothed block to facilitate being wrapped by the upper insulating member 30 and keeping the two circumferentially fixed.

[0118] In some possible embodiments, referring to Figures 8 to 11 As shown, in the area of the top surface 12 of the cover plate 10 corresponding to the upper insulating part 30, there are at least two positioning grooves 14b formed by partial downward depressions. All the positioning grooves 14b are distributed beside the pole hole 11. The bottom end of each positioning groove 14b away from the top surface 12 protrudes from the bottom surface 13 of the cover plate 10. At least two positioning protrusions 31b are formed on the upper insulating part 30 as mating parts, and the positioning protrusions 31b are respectively and correspondingly fitted with the positioning grooves 14b to achieve circumferential limiting.

[0119] In this way, the positioning groove 14b formed by downward depression from the top surface 12 can be used as the positioning part 14; at the same time, the positioning protrusion 31b protruding outward from the bottom surface of the upper insulating part 30 facing the top surface 12 is used as the mating part; through the embedding and fixation of the positioning groove 14b and the positioning protrusion 31b, the relative circumferential fixation between the cover plate 10 and the upper insulating part 30 is realized; furthermore, the riveting part 22 relatively fixed with the upper insulating part 30 can maintain circumferential relative fixation with the cover plate 10, and finally the whole pole 20 is in a state of preventing rotation with respect to the cover plate 10, so that on the basis that the thickness of the cover plate 10 is not enough to separately set a fixing structure, it is still possible to ensure that the pole 20 can be effectively fixed after the end cover 122 of the battery cell 121 is assembled, preventing it from rotating.

[0120] Optionally, the projection of the positioning groove 14b in the thickness direction can be circular, square, triangular or other shapes, and the depth of the positioning groove 14b in the thickness direction should be greater than the thickness of the cover plate 10. Specifically, a stamping process can be used to form a groove on the cover plate 10 that concaves away from the riveting part 22, which has good processability and low cost.

[0121] Referring to Figures 8 to 11 As shown, the positioning protrusion 31b can be designed according to the shape of the mating positioning groove 14b to meet the embedding and fixation of the positioning groove 14b and the positioning protrusion 31b. Exemplarily, the positioning protrusion 31b can be a cylinder, a square prism, a triangular prism, etc. The upper insulating part 30 can integrally form the corresponding positioning protrusion 31b by injection molding, so as to cooperate with the positioning groove 14b for positioning.

[0122] Referring to Figures 8 to 11 As shown, the number of the 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 beside the pole hole 11; in this way, the upper insulating part 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 part 30 cannot rotate circumferentially with the axis 11a of the pole hole 11 as the rotation center.

[0123] In some possible embodiments, referring to Figures 8 to 11As shown, a second step 16b is formed on the top surface 12 of the cover plate 10, and the second step 16b is disposed around the notch of the positioning groove 14b.

[0124] By providing the second step 16b in the area near the notch of the positioning groove 14b, especially in the stamping process, the stamping size of the positioning groove 14b can be made more plump, which is beneficial to reducing dimensional errors, thereby facilitating the fitting of the positioning groove 14b and the positioning protrusion 31b to achieve circumferential fixation, and further effectively fixing the pole column 20 on the cover plate 10 to prevent it from rotating.

[0125] Optionally, the overall depth of the second step 16b is 0.1 times to 0.3 times the thickness T of the cover plate 10, and the specific design can be based on requirements.

[0126] In some possible embodiments, referring to Figures 8 to 10 As shown, the end cover 122 includes a lower insulating member 40, and the lower insulating member 40 is disposed on the bottom surface 13 of the cover plate 10 on the other side along its thickness direction; a positioning groove 41b is formed by the area of the lower insulating member 40 corresponding to the positioning groove 14b sinking downward, and the bottom end of the positioning groove 14b away from the top surface 12 is embedded in the positioning groove 41b.

[0127] By forming the positioning groove 41b by the area of the lower insulating member 40 corresponding to the positioning groove 14b sinking downward, the 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 member 30 is embedded in the positioning groove 14b as a mating part, and is embedded and positioned again through the bottom of the positioning groove 14b and the positioning groove 41b, ensuring that the upper insulating member 30 and the lower insulating member 40 are respectively positioned on the opposite side surfaces of the cover plate 10 as a whole to avoid rotation. And through the cooperation of the positioning groove 41b, the positioning groove 14b, and the positioning protrusion 31b from bottom to top to achieve positioning, it is possible to avoid generating a gap between the lower insulating member 40 and the cover plate 10 due to the limiting groove 14a, ensuring that the lower insulating member 40 and the cover plate 10 can maintain a fitting state, which is convenient for assembly.

[0128] In some possible embodiments, referring to Figure 8 、 Figure 9 and Figure 12 As shown, the area of the top surface 12 of the cover plate 10 corresponding to the upper insulating member 30 has at least two positioning convex hulls 14c formed by partially protruding upward; all the positioning convex hulls 14c are distributed beside the pole hole 11; the bottom end of each positioning convex hull 14c away from the top surface 12 is recessed inward to form an empty groove 14d. At least two fixing grooves 31c are formed on the upper insulating member 30, and the positioning convex hulls 14c are respectively and correspondingly fitted with the fixing grooves 31c to achieve circumferential limitation.

[0129] Thus, the positioning convex hull 14c protruding upward from the top surface 12 can serve as the positioning portion 14; the fixing groove 31c recessed inward from the bottom surface of the upper insulating member 30 facing the top surface 12 serves as the mating portion; the cover plate 10 and the upper insulating member 30 are fixedly embedded through the positioning convex hull 14c and the fixing groove 31c, so as to realize the relative fixation in the circumferential direction between the cover plate 10 and the upper insulating member 30; furthermore, the riveting member 22 fixedly relative to the upper insulating member 30 can maintain a circumferential relative fixation with the cover plate 10, and finally a state of anti-rotation is achieved between the entire pole column 20 and the cover plate 10. Thus, on the basis that the thickness of the cover plate 10 is not sufficient to separately provide a fixing structure, it is still possible to ensure that the pole column 20 can be effectively fixed after the end cover 122 of the battery cell 121 is assembled, preventing it from rotating.

[0130] The projection of the fixing groove 31c along the thickness direction can be circular, square, triangular or other shapes. The upper insulating member 30 can integrally form the corresponding fixing groove 31c by injection molding, so as to cooperate and position with the positioning convex hull 14c.

[0131] The positioning convex hull 14c can be designed according to the shape of the mating fixing groove 31c. The projection along the thickness direction can be circular, square, triangular or other shapes. The depth of the positioning convex hull 14c along the thickness direction should be greater than the thickness of the cover plate 10. Specifically, a convex hull bulging toward the side close to the riveting member 22 can be formed on the cover plate 10 by stamping, which has good processability and low cost.

[0132] A third step 16c is formed on the bottom surface 13 of the cover plate 10, and the third step 16c is provided around the notch of the empty groove 14d.

[0133] An empty groove 14d is recessed inward at the bottom end of each positioning convex hull 14c away from the top surface 12; by providing the third step 16c in the area close to the notch of the empty groove 14d, especially in the stamping process, the stamping size of the positioning convex hull 14c can be made more plump, which is beneficial to reducing dimensional errors, so as to facilitate the fitting of the positioning convex hull 14c and the fixing groove 31c to achieve circumferential fixation, and further effectively fix the pole column 20 on the cover plate 10 to prevent it from rotating.

[0134] Optionally, the overall depth of the third step 16c is 0.1 times - 0.3 times the thickness T of the cover plate 10, and specifically it can be designed according to requirements.

[0135] In some possible embodiments, refer to Figure 8 、 Figure 9 and Figure 12 As shown, the end cover 122 includes a lower insulating member 40, and the lower insulating member 40 is disposed on the bottom surface 13 of the cover plate 10 on the other side along its thickness direction; a positioning post 41c is formed by protruding upward in the area of the lower insulating member 40 corresponding to the empty groove 14d, and the empty groove 14d is fitted and positioned with the positioning post 41c.

[0136] A positioning post 41c is formed by protruding upward in the area of the lower insulating part 40 corresponding to the empty slot 14d, so that the positioning post 41c can be embedded into the empty slot 14d, and the positioning convex hull 14c of the cover plate 10 is embedded into the fixing groove 31c on the upper insulating part 30, ensuring that the upper insulating part 30 and the lower insulating part 40 are respectively positioned on the opposite side surfaces of the cover plate 10 as a whole, and preventing rotation. And the positioning is realized through the two positioning fits of the positioning post 41c and the empty slot 14d, and the positioning convex hull 14c and the fixing groove 31c, which can avoid generating a gap between the lower insulating part 40 and the cover plate 10, ensure that the lower insulating part 40 and the cover plate 10 can be kept in a fitting state, and facilitate assembly.

[0137] In some possible embodiments, referring to Figure 12 As shown, a relief hole 22a is formed by inward depression in the area of the riveting part 22 corresponding to the fixing groove 31c, and one end of the fixing groove 31c far from the cover plate 10 is embedded and positioned with the relief hole 22a.

[0138] In this way, it can be ensured that the overall distance from the riveting part 22 to the cover plate 10 does not change, and further effectively control the overall height of the battery cell 121.

[0139] In some possible embodiments, referring to Figures 5 to 12 As shown, the end cover 122 includes a sealing ring 50. The sealing ring 50 is sleeved on the outer periphery of the column body 21, and both ends of the sealing ring 50 in the thickness direction of the cover plate 10 are respectively abutted against the upper insulating part 30 and the lower insulating part 40.

[0140] Specifically, the column body 21 of the pole column 20 includes a main body part and a limiting part. The main body part passes through the pole column hole 11. One end of the main body part is connected to the riveting part 22, and the other end is connected to 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 larger than the diameter of the pole column hole 11, so as to prevent the pole column 20 from detaching from the pole column hole 11. Both ends of the sealing ring 50 in the thickness direction of the cover plate 10 are respectively abutted against the upper insulating part 30 and the lower insulating part 40. A part of the sealing ring 50 extends into the pole column hole 11 and abuts against the upper insulating part 30, and the other part is clamped between the limiting part of the column body 21 and the cover body 10, so as to realize insulating isolation between the pole column 20 and the cover plate 10.

[0141] The second aspect of the embodiment of the present application provides an end cover 122 for use in the above-mentioned battery cell 121.

[0142] Among them, the end cover 122 includes a cover plate 10, an upper insulating member 30, and a terminal post 20. The cover plate 10 is formed with a through terminal post hole 11. The upper insulating member 30 is disposed on the top surface 12 of the cover plate 10 on one side in the thickness direction X thereof. The terminal post 20 sequentially passes through the terminal post hole 11 and the upper insulating member 30, and the top end of the terminal post 20 is fixed to the upper insulating member 30. The upper insulating member 30 is in anti-rotation cooperation with the cover plate 10.

[0143] 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.

[0144] A fourth aspect of the present application provides an electrical device 1000, including at least one battery 100 described in the above embodiments, and the battery 100 is used to supply electrical energy to the electrical device 1000.

[0145] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope described in this specification.

[0146] The above embodiments only represent several implementation manners of the present application. The description is relatively specific and detailed, but it cannot be understood as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A battery cell, characterized in that: The battery cell includes an end cover (122); The end cover (122) comprises: a cover plate (10), an upper insulating member (30) and a pole (20); The cover plate (10) is formed with a penetrating pole hole (11); The upper insulating member (30) is arranged on a top surface (12) of the cover plate (10) on one side along the thickness direction thereof; The pole (20) is sequentially penetrated by the pole hole (11) and the upper insulating member (30), and the top end of the pole (20) is fixed to the upper insulating member (30); Wherein, the upper insulating member (30) is engaged with the cover plate (10) to prevent rotation.

2. The battery cell according to claim 1, characterized in that: The pole hole (11) has an axis (11a), and on at least one surface perpendicular to the axis (11a), the edge of the upper insulating member (30) has a first contact point and a second contact point both in contact with the cover plate (10), wherein the first contact point and the second contact point are at unequal distances from the axis (11a).

3. The battery cell according to claim 1, characterized in that: A positioning portion (14) is formed on the cover plate (10), and a matching portion adapted to be embedded in the positioning portion (14) is formed on the upper insulating member (30); One of the positioning portion (14) and the matching portion is a groove, and the other is a hollow convex hump.

4. The battery cell according to claim 3, characterized in that: Along the thickness direction of the cover plate (10), the ratio of the wall thickness of the positioning portion (14) to the wall thickness of other regions of the cover plate (10) is 0.8 to 1.2 times.

5. The battery cell according to claim 3, characterized in that: A step portion (16) is formed on the cover plate (10), and the step portion (16) is arranged around a region of the cover plate (10) close to the positioning portion (14).

6. The battery cell according to claim 3, characterized in that: The end cover (122) comprises a lower insulating member (40), and the lower insulating member (40) is arranged on the bottom surface (13) of the cover plate (10) on the other side along the thickness direction thereof; a matching portion (41) is formed in the area of ​​the lower insulating member (40) corresponding to the positioning portion (14), and the positioning portion (14) is connected to the matching portion (41) in a limiting manner.

7. The battery cell according to any one of claims 1 to 5, characterized in that: The thickness of the cover plate (10) is T and satisfies: 0.5 mm < T ≤ 1.5 mm; 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 to 5, characterized in that: The pole (20) comprises a column (21) and a rivet (22), wherein the column (21) is inserted into the pole hole (11); the rivet (22) is riveted to a section of the column (21) protruding from the top surface (12) to form the top end of the pole (20); The upper insulating part (30) wraps the bottom side surface and at least a portion of the outer peripheral surface of the rivet part (22).

9. The battery cell according to claim 8, characterized in that: The upper insulating member (30) comprises a bottom plate (32) and an annular side wall (33), wherein the bottom plate (32) is formed with a through hole (34) for the column (21) to pass through; the bottom plate (32) is used to wrap the bottom side surface of the rivet (22); the annular side wall (33) is arranged around the edge of the bottom plate (32) and extends along the thickness direction to wrap the rivet (22).

10. The battery cell according to claim 8, characterized in that: The top surface (12) of the cover plate (10) is integrally recessed downward in an area corresponding to the upper insulating member (30) to form a limiting groove (14a); the bottom end of the limiting groove (14a) away from the top surface (12) protrudes from the bottom surface (13) of the cover plate (10); the pole hole (11) is arranged at the bottom of the limiting groove (14a); The upper insulating member (30) is entirely embedded in the limiting groove (14a).

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

12. The battery cell according to claim 10, characterized in that: The end cover (122) comprises a lower insulating member (40), and the lower insulating member (40) is 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 sunken downward in an area corresponding to the limiting groove (14a) to form an avoidance groove (41a), and the bottom end of the limiting groove (14a) away from the top surface (12) is embedded in the avoidance groove (41a).

13. The battery cell according to claim 10, characterized in that: Projected along the thickness direction, the projection surface of the upper insulating member (30) is triangular, square, elliptical or toothed; and / or, The riveted piece (22) is a triangular block, a square block, an elliptical block or a toothed block.

14. The battery cell according to claim 8, characterized in that: The top surface (12) of the cover plate (10) has at least two positioning grooves (14b) partially recessed downward in an area corresponding to the upper insulating member (30); all the positioning grooves (14b) are distributed beside the pole hole (11); the bottom end of each positioning groove (14b) away from the top surface (12) protrudes from the bottom surface (13) of the cover plate (10); At least two positioning protrusions (31b) are formed on the upper insulating member (30), and the positioning protrusions (31b) are engaged with the positioning grooves (14b) in a one-to-one correspondence.

15. The battery cell according to claim 14, characterized in that: A second step (16b) is formed on the top surface (12) of the cover plate (10), and the second step (16b) is arranged around the notch of the positioning groove (14b).

16. The battery cell according to claim 14, characterized in that: The end cover (122) comprises a lower insulating member (40), and the lower insulating member (40) is 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 sunken downward in an area corresponding to the positioning groove (14b) to form a positioning groove (41b), and the bottom end of the positioning groove (14b) away from the top surface (12) is embedded in the positioning groove (41b).

17. The battery cell according to claim 8, characterized in that: The top surface (12) of the cover plate (10) has at least two positioning bumps (14c) partially protruding upward in an area corresponding to the upper insulating member (30); all positioning bumps (14c) are distributed beside the pole hole (11); the bottom end of each positioning bump (14c) away from the top surface (12) is recessed inward to form a hollow groove (14d); At least two fixing grooves (31c) are formed on the upper insulating member (30), and the positioning convex bumps (14c) are engaged with the fixing grooves (31c) in a one-to-one correspondence.

18. The battery cell according to claim 17, characterized in that: A third step (16c) is formed on the bottom surface (13) of the cover plate (10), and the third step (16c) is arranged around the notch of the empty groove (14d).

19. The battery cell according to claim 17, characterized in that: The end cover (122) comprises a lower insulating member (40), and the lower insulating member (40) is 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) protrudes upwards in an area corresponding to the empty groove (14d) to form a positioning column (41c), and the empty groove (14d) and the positioning column (41c) are embedded and positioned.

20. The battery cell according to claim 17, characterized in that: The area of ​​the riveting piece (22) corresponding to the fixing groove (31c) is recessed inwardly to form an avoidance hole (22a), and one end of the fixing groove (31c) away from the cover plate (10) is embedded and positioned with the avoidance hole (22a).

21. The battery cell according to claim 6, characterized in that: The pole (20) comprises a column (21), wherein the column (21) is inserted into the pole hole (11); the end cover (122) comprises a sealing ring (50), wherein the sealing ring (50) is sleeved on the outer circumference of the column (21), and the two ends of the sealing ring (50) along the thickness direction of the cover plate (10) are respectively in contact with the upper insulating member (30) and the lower insulating member (40).

22. An end cap used in a battery cell according to any one of claims 1 to 21, characterized in that: The end cap comprises: A cover plate (10) is formed with a through-going pole hole (11); An upper insulating member (30) is arranged on a top surface (12) of the cover plate (10) on one side along the thickness direction thereof; and a pole (20), through which the pole hole (11) and the upper insulating member (30) are sequentially penetrated, and the top end of the pole (20) is fixed to the upper insulating member (30); Wherein, the upper insulating member (30) is engaged with the cover plate (10) to prevent rotation.

23. A battery, characterized in that: Comprising the battery cell according to any one of claims 1 to 21.

24. An electrical device, characterized in that: Comprising a battery as claimed in claim 23, the battery is used to provide electrical energy.

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