WO2023023997A1

WO2023023997A1 - Battery

Info

Publication number: WO2023023997A1
Application number: PCT/CN2021/114621
Authority: WO
Inventors: 林鸿凯; 曾玉祥; 王永旺; 许德胜; 陈龙云
Original assignee: 珠海冠宇电池股份有限公司
Priority date: 2021-08-25
Filing date: 2021-08-25
Publication date: 2023-03-02

Abstract

The present application provides a battery, comprising a housing, a top cover and a battery cell. The top cover covers the upper end of the housing, and a cavity is formed by means of enclosure by the top cover and the housing. The battery cell is positioned in the cavity and is provided with a first tab and a second tab, the polarities of the first tab and the second tab being opposite to each other. The top cover comprises a metal sheet, an insulating member, a conductive member and a second adapter, wherein the second tab is electrically connected to the metal sheet; the second adapter comprises a second connecting sheet and a second pin arranged on the second connecting sheet; the second adapter is connected to the metal sheet by means of the second connecting sheet; and one end of the second pin is connected to the second connecting sheet, and the other end of the second pin extends out of the outer edge of the top cover. By means of the present application, the performance of a battery, such as the stability thereof, can be improved.

Description

Battery

technical field

The application relates to a battery and belongs to the field of batteries.

Background technique

Batteries are common electrochemical energy storage devices and are widely used in electronic products. For example, button batteries are often used in wearable electronic products. With the development of wearable electronic products, the stability and other properties of button batteries have also been raised higher and higher requirements. Battery PACK generally refers to the packaging, encapsulation and assembly of the battery. It is an indispensable part of the battery and an important factor affecting the stability and other performance of the battery. Specifically, the battery has a PACK structure of cells and packaged cells. The core includes a stacked positive electrode sheet, a diaphragm, a negative electrode sheet, a positive electrode ear connected to the positive electrode sheet, and a negative electrode ear connected to the negative electrode sheet. The PACK structure is provided with a positive electrode adapter (positive PIN) and a negative electrode transfer piece (negative electrode PIN), the positive PIN is electrically connected to the positive ear, and the negative PIN is electrically connected to the negative ear, so that the positive PIN and the negative PIN can be used as the connection between the internal circuit of the battery and the peripheral circuit. However, the current battery PACK structure is not conducive to the stability of the battery, etc. Performance, for example, the common positive PIN and negative PIN are wires connected to the positive and negative tabs respectively. There are defects such as the positive PIN and negative PIN in the battery pack are not firmly set, which affects the stability of the battery and other performance.

Invention content

The present application provides a battery, which has good stability and other properties, and can effectively overcome the defects existing in the prior art.

The present application provides a battery, including a casing, a top cover and an electric core, the top cover covers the upper end of the casing and forms a cavity with the casing, and the electric core is located in the cavity In the body, the electric core has a first tab and a second tab, and the polarity of the first tab and the second tab are opposite; the top cover includes a metal sheet, an insulating part, a conductive part and a second turning connector, wherein: the second tab is electrically connected to the metal sheet, the second adapter includes a second connecting sheet and a second pin provided on the second connecting sheet, the second The adapter is connected to the metal sheet through the second connecting piece, one end of the second pin is connected to the second connecting piece, and the other end of the second pin extends out of the top cover edge.

According to an embodiment of the present application, the second connecting piece includes a first connecting portion, a second connecting portion, and a transition portion connected between the first connecting portion and the second connecting portion, and the first connecting portion is welded On the metal sheet; the top surface of the second connection part is higher than the top surface of the first connection part, and/or, the bottom surface of the second connection part is higher than the bottom surface of the first connection part.

According to an embodiment of the present application, the top cover further includes a first insulating sheet, and the second connecting sheet includes a first connecting portion, a second connecting portion, and a connection between the first connecting portion and the second connecting portion. The transition part, the first connecting part is welded on the metal sheet, and the second connecting part is connected to the metal sheet through the first insulating sheet.

According to an embodiment of the present application, the thickness of the first insulating sheet is 0.05mm˜0.1mm.

According to an embodiment of the present application, the metal sheet is provided with a first through hole communicating with the cavity, the conductive member is provided at the first through hole, and is connected to the metal sheet through the insulating member. The sheet is insulated and connected, and seals the first through hole, and the conductive member is electrically connected to the first tab; the battery also includes a first adapter, and the first adapter includes a first connecting piece and a first pin arranged on the first connecting piece, one end of the first pin is connected with the first connecting piece, and the other end of the first pin protrudes from the outer edge of the top cover, the The first transition piece is connected to the conductive piece through the first connecting piece.

According to an embodiment of the present application, the housing is provided with an insulating layer and satisfies at least one of the following features: the part where the other end of the first pin protrudes from the outer edge of the top cover is the first An adapter, the first pin also includes a first extension extending to the side wall of the housing, the first connecting piece is connected to one end of the first extension, and the first adapter is connected to the first extension. The other end of the first extension part is connected to the other end, and the first extension part is insulated from the housing through the insulating layer; the part where the other end of the second pin protrudes from the outer edge of the top cover is the second An adapter, the second pin also includes a second extension extending to the side wall of the housing, the second connecting piece is connected to one end of the second extension, the second adapter is connected to the second extension The other end of the second extension part is connected to the other end, and the second extension part is in contact with the housing through the insulating layer.

According to an embodiment of the present application, the second pin includes a positioning pin and a conductive pin, and in the direction from the bottom plate of the housing to the top cover, the second adapter of the positioning pin is connected to the top cover The distance is greater than or equal to the distance from the second adapter of the conductive pin to the top cover, and/or, the distance from the second adapter of the positioning pin to the top cover is greater than or equal to the first The distance from the first adapter of one pin to the top cover.

According to an embodiment of the present application, the second pins include positioning pins and conductive pins, and in the projection of the battery perpendicular to the direction from the bottom plate of the case to the top cover, the positioning pins are located on the conductive pin and the first pin.

According to an embodiment of the present application, the second connecting piece includes a first connecting portion, a second connecting portion, and a transition portion connected between the first connecting portion and the second connecting portion, and the first connecting portion is welded On the metal sheet; the top surface of the second connection part is higher than the top surface of the first connection part, and/or, the bottom surface of the second connection part is higher than the bottom surface of the first connection part; The part where the other end of the first pin protrudes from the outer edge of the top cover is a first adapter, and the part where the other end of the second pin protrudes from the outer edge of the top cover is a second adapter; The second pin includes a conductive pin and a positioning pin, and in the orthographic projection of the top cover perpendicular to the thickness direction of the top cover, the second adapter of the positioning pin is located on the first pin Between the first adapter and the second adapter of the conductive pin; and the angle between the first connection line and the second connection line is α, α>30°, and the first connection line passes through the The center point of the orthographic projection of the top cover bisects the straight line of the transition portion, and the second connecting line passes through the center point of the orthographic projection of the top cover and bisects the second adapter of the positioning pin.

According to an embodiment of the present application, 60°≦α≦140°.

According to an embodiment of the present application, 100°≦α≦125°.

According to an embodiment of the present application, the second pin is disposed on the second connecting portion.

According to an embodiment of the present application, the second welding mark generated by the welding passes through the second connecting portion and extends to 1/3˜2/3 of the thickness of the metal sheet.

According to an embodiment of the present application, the top cover further includes a seventh insulating sheet, and the first pin is insulated from the metal sheet through the seventh insulating sheet.

According to an embodiment of the present application, the thickness of the seventh insulating sheet is 0.05mm˜0.1mm.

According to an embodiment of the present application, the first connecting piece is welded on the conductive member, and the first welding mark generated by the welding passes through the first connecting piece and extends to 1/3-3 of the conductive member. 2/3 thickness.

According to an embodiment of the present application, the conductive member includes a rivet.

According to an embodiment of the present application, the first transition member is located on a side of the conductive member away from the cavity.

According to an embodiment of the present application, the outer peripheral edge of the metal sheet is welded to the upper end of the housing, so as to realize that the top cover is sealed on the upper end of the housing.

According to an embodiment of the present application, the cross section of the second connecting piece perpendicular to the thickness direction of the second connecting piece is an incomplete circular ring with an opening.

According to an embodiment of the present application, the outer edge of the second connecting piece is an arc, and the arc is substantially concentric with the outer edge of the housing.

According to an embodiment of the present application, the second adapter is located on a side of the metal sheet away from the cavity.

According to an embodiment of the present application, it further includes a second insulating sheet arranged on the side of the top cover away from the cavity, the second insulating sheet covers the orthographic projection perpendicular to the thickness direction of the top cover The orthographic projection of the top cover perpendicular to the thickness direction of the top cover.

According to an embodiment of the present application, the first tab is a positive tab, and the second tab is a negative tab.

According to an embodiment of the present application, the battery is a button battery.

In this application, the second adapter is arranged on the top cover of the battery PACK structure through the second connecting piece, and is electrically connected to the second tab through the metal sheet of the top cover, and its second pin extends out of the outer edge of the top cover. It can be used as a joint with the peripheral circuit, and can also play a positioning role, which is beneficial to improve the stability of the battery after it is assembled in the electronic product, and can ensure the stability of the electrical connection between the second adapter and the second tab, avoiding the second When the first adapter and the second adapter are broken from the structure of the battery PACK, the stability and other performance of the battery are ensured, and the function of the battery is guaranteed.

Description of drawings

FIG. 1 is a schematic diagram of a battery structure according to an embodiment of the present application;

2 is a schematic top view of a battery according to an embodiment of the present application;

3 is a schematic diagram of an orthographic projection of the top cover of the battery perpendicular to its thickness direction according to an embodiment of the present application;

FIG. 4 is a schematic bottom view of a battery according to an embodiment of the present application;

5 is a schematic cross-sectional structure diagram of a battery according to an embodiment of the present application;

6 and 7 are exploded views of a battery according to an embodiment of the present application.

Description of reference signs: 1: shell; 2, metal sheet; 3: first adapter; 4: second adapter; 5: conductive element; 6, cavity; 7: insulating element; 8, first Straight part of tab; 9, battery core; 10, seventh insulating sheet; 11: insulating layer; 12: bottom case; 20: sixth insulating sheet; 21: third connecting part; 22: fourth connecting part; 31 : first adapter; 32: first extension; 33: horizontal part; 34: first connecting piece; 41, 41': second adapter; 42, 42': second extension; 43: first connection 44: second connecting part; 71: third insulating sheet; 72: fourth insulating sheet; 111: first insulating layer; 112: second insulating layer; α: included angle.

Detailed ways

In order to enable those skilled in the art to better understand the solution of the present application, the present application will be further described in detail below. In the description of this application, unless otherwise clearly specified and limited, the terms "setting", "connecting", "connecting", "connecting" and so on should be interpreted in a broad sense, for example, it can be a fixed connection or a flexible connection. The disassembly connection can also be an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediary, or an internal communication between two components, etc. As far as personnel are concerned, the specific meanings of the above-mentioned belongings in this application can be understood in specific situations. In addition, the terms "first", "second", "third", "fourth", "fifth", "sixth", "seventh", etc. are used for descriptive purposes only, such as to distinguish between components, to A clearer description/explanation of the technical solution should not be interpreted as indicating or implying the quantity of the indicated technical features or the order of substantive significance. Terms such as "upper end", "above", "below", "lower end" and "bottom surface" that indicate orientation are based on the side where the top cover is located, and the side where the bottom shell is located is the bottom, between the top cover and the bottom shell. The outer surface of the cavity wall between the bottom shell and the bottom shell is used as a reference to describe the relative positional relationship of each component.

As shown in Figures 1 to 7, the battery of the present application includes a casing 1, a top cover and an electric core 9, the top cover covers the upper end of the casing 1 and surrounds the casing 1 to form a cavity 6, and the electric core 9 Located in the cavity 6, the electric core 9 has a first tab and a second tab, the polarity of the first tab and the second tab are opposite; the top cover includes a metal sheet 2, an insulating member 7, a conductive member 5, a first Two adapters 4, wherein: the second tab is electrically connected to the metal sheet 2, the second adapter 4 includes a second connecting piece and a second pin arranged on the second connecting piece, and the second connecting piece 4 passes through The second connecting piece is connected to the metal sheet 2, one end (first end) of the second pin is connected to the second connecting piece, and the other end (second end) of the second pin is stretched out from the outer edge of the top cover. Wherein, the first end is opposite to the second end.

Under normal circumstances, the above-mentioned battery also includes a first adapter 3, the metal sheet 2 is provided with a first through hole communicating with the cavity 6, and the conductive member 5 is arranged at the first through hole and is insulated from the metal sheet by an insulating member. , and seal the first through hole, the conductive member is electrically connected to the first tab; the first adapter 3 includes a first connecting piece 34 and a first pin arranged on the first connecting piece 34, the first pin One end (first end) of the pin is connected to the first connecting piece 34, the other end (second end) of the first pin extends out of the outer edge of the top cover, and the first adapter 3 is connected to the conductive member 5 through the first connecting piece 34. connected.

Specifically, the first adapter 3 is electrically connected to the first tab and insulated from the second tab, the second adapter 4 is electrically connected to the second tab and insulated from the first tab, and the first adapter The part 3 and the second adapter part 4 are all located on the side of the metal sheet 2 away from the cavity 6 (that is, above the metal sheet 2); the housing 1 includes a cavity wall surrounding the cavity 6 (that is, the wall of the casing side wall), and the bottom shell (i.e. the bottom plate of the housing) 12 connected to the lower end of the cavity wall, the top cover is connected to the upper end of the cavity wall, and the top cover, cavity wall and bottom shell 12 surround the above-mentioned cavity 6. Wherein, the outer peripheral edge of the metal sheet 2 can be welded to the upper end of the housing 1, so as to cover the upper end of the housing 1 with the top cover, and the housing 1 can be integrally formed by the cavity wall and the bottom shell 12, or The outer peripheral edge of the bottom case 12 is welded to the lower end of the housing 1 . In this application, the second tab is electrically connected to the metal sheet 2, which may be directly connected to the second tab metal sheet 2, for example, the second tab is welded to the metal sheet, or the second tab may be passed through the shell. The body 1 is electrically connected to the metal sheet, for example, the second tab is welded on the shell 1, and the outer peripheral edge of the metal sheet 2 is welded to the upper end of the shell 1, so that the second tab, the shell, the metal sheet, and the second tab are welded together. The two adapters are electrically connected in sequence.

Generally, the metal sheet 2, the insulating member 7, the conductive member 5, the cavity 6, and the first through hole are arranged concentrically, and the shape of the cross section of the metal sheet 2 perpendicular to the thickness direction of the metal sheet 2 can be circular, for example, The shape of the cross section of the conductive element 5 perpendicular to the thickness direction of the conductive element 5 may be, for example, a circle, the shape of the housing 1 may be, for example, a cylinder, and the battery may be, for example, a button battery, but is not limited thereto. The aforementioned thickness direction is the same as the direction from the bottom case 12 (ie, the bottom surface of the case 1 ) to the top cover (ie, the axial direction of the battery).

The above-mentioned first adapter 3 and second adapter 4 are used as the connection between the battery and the peripheral circuit, and the part extending out of the outer edge of the top cover is used as an adapter connected to the peripheral circuit (i.e. the following first adapter and the second adapter), so that the battery is respectively connected to the peripheral circuit through the adapter, for example, connected to the circuit in the electronic product equipped with the battery.

In some embodiments, the top cover further includes a seventh insulating sheet 10, the first pin is insulated from the metal sheet 2 through the seventh insulating sheet 10, that is, the seventh insulating sheet 10 is located between the first pin and the metal sheet 2, The first pin is insulated from the metal sheet 2 through the seventh insulating sheet 10 . The thickness of the seventh insulating sheet may generally be 0.05mm˜0.1mm, such as 0.05mm, 0.08mm, 0.1mm and so on.

In the present application, the first pin may be linear, that is, the first pin is a straight structure extending outward from the first connecting piece 34, and the surface of the straight structure perpendicular to its thickness direction is in contact with the first connecting piece 34. The surfaces perpendicular to the thickness direction thereof are basically parallel, and the first pin may also be L-shaped or other shapes. In some preferred embodiments, the housing 1 is provided with an insulating layer 11, the part where the other end of the first pin protrudes from the outer edge of the top cover is the first adapter 31, and the first pin also includes a The first extension part 32 of the side wall, the first connecting piece 34 is connected to one end of the first extension part 32, the first adapter 31 is connected to the other end of the first extension part 32, and the first extension part 32 is connected to the first extension part 32 through the insulating layer 11. The casing 1 is insulated, and this structure facilitates the assembly of the battery in the electronic product through the first adapter 31, which not only realizes the circuit connection between the battery and the electronic product, but also facilitates the positioning of the battery in the electronic product through the first adapter 31, improving the battery life. Stability in electronics.

Generally, the first pin is bent at the junction of the top cover and the housing, and extends to the side wall of the housing through the first extension, so that the first adapter is located on the side of the housing 1 (the above cavity wall The surface away from the cavity 6), specifically, the first pin includes a horizontal portion 33, a first bent portion, a first extension portion 32, a first connecting piece 34, a horizontal portion 33, a first bent portion, a first The extension parts 32 are connected in sequence, and the first pin is bent at the intersection of the top cover and the housing through the first bending part, so that the first extension part 32 is located on the side wall of the housing 1, that is, the horizontal part 33 is located on the side wall of the housing 1. On the top cover, its surface is basically parallel to the surface of the first connecting piece 34, one end of the first bent part is connected with the horizontal part 33, and the other end of the first bent part is connected with one end of the first extension part 32, the first The other end of the extension part 32 is connected to the first adapter 31 . Wherein, the horizontal part 33 is insulated from the metal sheet 2 through the seventh insulating sheet 10, and the first bending part and the first extension part 32 are insulated from the housing 1 through the insulating layer 11, so that the first adapter 3 and the second Tabs are insulated to avoid short circuit and so on.

Optionally, the first adapter 31 may be in the shape of a sheet, and the included angle between the plane where the surface of the first adapter 31 is perpendicular to the thickness direction of the first adapter 31 and the axial direction of the battery is less than or equal to 90°, preferably About 90°, that is, the surface of the first adapter 31 perpendicular to its thickness direction is substantially perpendicular to the axial direction of the battery. The first adapter can be integrally formed.

In the present application, the second pin may be linear, that is, the second pin is a straight structure extending outward from the second connecting piece, and the surface of the straight structure perpendicular to its thickness direction is perpendicular to the second connecting piece. The surfaces in the thickness direction are basically parallel, and the second pins can also be L-shaped or other shapes. In some preferred embodiments, the part where the other end of the second pin protrudes from the outer edge of the top cover is a second adapter (such as the second adapter 41 and the second adapter 41' in FIGS. 1 to 3 ), The second pin also includes a second extension extending to the side wall of the housing 1 (such as the second extension 42 of the conductive pin and the second extension 42' of the positioning pin in Figure 1), the second connecting piece It is connected to one end of the second extension, the second adapter is connected to the other end of the second extension, and the second extension is connected to the housing 1 through the insulating layer 11 (that is, the insulating layer 11 is located between the second extension and the housing. between), this structure facilitates the assembly of the battery in the electronic product through the second adapter, which not only realizes the circuit connection between the battery and the electronic product, but also facilitates the positioning of the battery in the electronic product through the second adapter, and improves the battery’s performance in the electronic product. in the stability.

In general, the orthographic projection of the metal sheet 2 perpendicular to the axis of the battery covers the orthographic projection of the second connecting sheet perpendicular to the axis of the battery, that is, the second connecting sheet does not exceed the outer edge of the metal sheet, for example, the metal sheet 2 The cross section perpendicular to its thickness direction is circular, the cross section of the second connecting piece perpendicular to its thickness direction is semicircular, the metal sheet 2 is concentrically arranged with the second connecting piece, and the outer diameter of the metal sheet 2 is not less than the second The outer diameter of the connecting piece, preferably the outer diameter of the metal sheet 2 is larger than the outer diameter of the second connecting piece, the second pin is bent at the junction of the top cover and the housing, and extends to the side of the housing through the second extension wall so that the second adapter is on the side of the housing. Specifically, the second pin includes a second bending part and a second extending part, the second connecting piece, the second bending part and the second extending part are connected in sequence, and the second pin is connected on the top cover through the second bending part. The junction with the shell is bent so that the second extension is located on the side wall of the shell 1, that is, one end of the first bent portion is connected to the second connecting piece on the top cover, and the other end is connected to the second connecting piece located on the shell. One end of the second extension part on the side of the body 1 is connected, the other end of the second extension part is connected to the second adapter, the second bending part and the second extension part are connected to the housing 1 through the insulating layer 11 .

Optionally, the second adapter can be in the shape of a sheet, and the angle between the plane where the surface of the second adapter is perpendicular to the thickness direction of the second adapter and the axial direction of the battery is less than or equal to 90°, preferably about 90° , that is, the surface of the second adapter perpendicular to its thickness direction is substantially perpendicular to the axial direction of the battery. The second adapter can be integrally formed.

In the present application, the number of the second pins can be one or more, preferably at least two, at least one of which is used as a conductive pin for wiring with a peripheral circuit, and at least one is used as a positioning pin for Assembling the positioning structure of the battery in the electronic product, the second adapter of the battery is integrally formed, and at the same time, the conductive pins and positioning pins are set on the second adapter, which is conducive to further simplifying the battery structure and improving the structural stability of the battery and other performance.

In some embodiments, the second pins include positioning pins and conductive pins. In the projection of the battery perpendicular to the direction from the bottom plate of the bottom case to the top cover, the positioning pins can be located between the conductive pins and the first pins. between.

In addition, in the direction from the bottom plate of the housing to the top cover, the distance from the second adapter 41' of the positioning pin to the top cover is greater than or equal to the distance from the second adapter 41 of the conductive pin to the top cover, and/or , the distance from the second adapter 41' of the positioning pin to the top cover is greater than or equal to the distance from the first adapter 41 of the first pin to the top cover, that is, the second adapter 41' of the positioning pin may not be higher than The second adapter 41 of the conductive pin and/or the first adapter 31 of the first pin, that is, the distance from the second adapter 41' of the positioning pin to the top cover is greater than or equal to the second adapter of the conductive pin 41 to the top cover and/or the distance from the first adapter of the first pin to the top cover, it is generally preferred that the second adapter 41' of the positioning pin is lower than the second adapter 41 of the conductive pin and/or The first adapter 31 of the first pin (that is, the second adapter 41' of the positioning pin is located under the second adapter 41 and/or the first adapter 31 of the first pin, and the second adapter 41' of the conductive pin The adapter 41 and/or the first adapter 31 of the first pin is closer to the top cover than the second adapter 41' of the positioning pin), for example, the second adapter 41' of the positioning pin can be located on the conductive Below the second adapter 41 of the pin, or below the first adapter 31 of the first pin, or at the same time of the first adapter 31 of the first pin and the second adapter 41 of the conductive pin Below (as shown in Figure 1), wherein, the distance from the second adapter 41 of the conductive pin and the first adapter 31 of the first pin to the top cover can be substantially equal or different, that is, the two are on the housing side The heights of the walls may be the same or different, and the present application does not specifically limit this. The distance mentioned is the vertical distance from the first adapter or the second adapter to the top cover.

In the present application, the second adapter piece 4 may specifically be welded on the metal sheet 2 (that is, the second connecting piece is welded to the metal sheet 2 ), and the electrical connection is realized through the metal sheet 2 and the second tab. In some embodiments, the second connecting piece includes a first connecting portion 43, a second connecting portion 44, and a transition portion connected between the first connecting portion 43 and the second connecting portion 44, and the first connecting portion 43 is welded on On the metal sheet 2, the top surface of the second connection portion 44 (the surface away from the metal sheet 2) is higher than the top surface of the first connection portion 43 (the surface away from the metal sheet 2) and/or the bottom surface of the second connection portion 44 (the surface facing the metal sheet 2) is higher than the bottom surface of the first connecting portion 43 (the surface facing the metal sheet 2), that is, the top surface of the second connecting portion 44 is farther away from the metal sheet 2 than the top surface of the first connecting portion 43 And/or the bottom surface of the second connecting portion 44 is farther away from the metal sheet 2 than the bottom surface of the first connecting portion 43, which means that the second connecting piece is bent through the transition portion to form the first connecting portion 43 and the second connecting portion 44 respectively , through this structural design, it can play the role of magnetic shielding, that is, shielding the magnetic field generated by the current during the battery's working process, avoiding the influence of the magnetic field on the electronic products using the battery, such as avoiding the phenomenon of noise caused by the magnetic field in the electronic products, etc. , to further improve the performance of the battery.

In some embodiments, the top cover further includes a first insulating sheet, and the second connecting sheet includes a first connecting portion 43 , a second connecting portion 44 , and a transition between the first connecting portion 43 and the second connecting portion 44 The first connecting part 43 is welded on the metal sheet 2, and the second connecting part 44 is connected to the metal sheet 2 through the first insulating sheet (that is, the first insulating sheet is located between the second connecting part 44 and the metal sheet 2). As mentioned above, generally the bottom surface of the second connecting portion 44 is higher than the bottom surface of the first connecting portion 43 , and the top surface of the second connecting portion 44 (the surface facing away from the metal sheet 2 ) is higher than the top surface of the first connecting portion 43 .

In some embodiments, the thickness of the first insulating sheet may be 0.05 mm˜0.1 mm, such as 0.05 mm, 0.08 mm, 0.1 mm and so on.

Optionally, the first insulating sheet and the seventh insulating sheet 10 may be the same insulating sheet, which is beneficial to further simplify the battery structure. The insulating layer 11 may include a first insulating layer 111 surrounding the side of the casing 1 and a second insulating layer 112 extending to the upper end of the casing 1, the first insulating layer 111, the second insulating layer 112 and the seventh insulating sheet 10 connected in sequence, the first insulating layer 111 is located between the first extension 32 of the first pin and the housing 1, and is located between the second extension 32 of the second pin and the housing 1, and the second insulating layer 112 is located Between the bending part (first bending part) of the first pin and the housing 1, and between the bending part (second bending part) of the second pin and the housing 1, the first insulating layer 111 surrounds the casing 1 , which means that the casing 1 is located in the cavity surrounded by the first insulating layer 111 .

In the present application, the second pin can be specifically arranged on the second connecting part 44, that is, one end of the second pin is connected to the second connecting part 44, and the other end is used as a connector for connecting the peripheral circuit. In some embodiments, the second pin The second pin includes a conductive pin and a positioning pin. In the orthographic projection of the top cover perpendicular to the thickness direction of the top cover, the second adapter 41' of the positioning pin is located between the first adapter 31 and the first pin of the first pin. Between the second adapters 41 of the conductive pins, and satisfying that the angle between the first connection line and the second connection line is α, α>30° (as shown in Figure 4), the first connection line is over the top cover The center point of the orthographic projection bisects the straight line of the above-mentioned transition portion, and the second connecting line is a straight line passing through the center point of the orthographic projection of the top cover and bisecting the second adapter 41 ′ of the positioning pin. Wherein, the first connecting line bisects the transition portion, that is, the distance from the first connecting line to the junction of the transition portion and the first connecting portion 43 and the distance from the first connecting line to the junction of the transition portion and the second connecting portion 44 Basically equal, the second connecting line bisects the second adapter 41' of the positioning pin, that is, the distance from the second connecting line to the second adapter 41' of the positioning pin (referred to as the first side) is the same as the distance between the second connecting line and the second adapter 41' of the positioning pin. The distance from the second connection line to the other side (referred to as the second side) of the second adapter 41' of the positioning pin is basically equal, the first side is opposite to the second side, and the center point of the orthographic projection of the top cover is located at the top The center of the orthographic projection of the cover, for example, the orthographic projection of the top cover is a circle, the center point is the center of the circle of the orthographic projection of the top cover, or, the orthographic projection of the top cover is a rectangle (or square), the center point is The intersection of the two diagonals of the rectangle (or square). Optionally, α can be 40°, 50°, 60°, 70°, 80°, 90°, 100°, 110°, 120°, 130°, 140° or any combination of them The angle value in is generally preferably 60°≤α≤140°, more preferably 100°≤α≤125°, for example 108° (as shown in FIG. 4 ).

During specific implementation, the conductive pin can be used as the connection between the battery and the peripheral circuit, and its second adapter can be used as a joint connected to the peripheral circuit. The second adapter 41' (or positioning piece) of the pin is clamped in the electronic product to realize the assembly of the battery in the electronic product, but it is not limited to this, because the positioning pin, the conductive pin and the second connection Therefore, the functions of the positioning pins and the conductive pins can also be interchanged as needed, that is, the positioning pins are used as the connection between the battery and the peripheral circuit, and the conductive pins are used to assemble the battery on the Positioning structures in electronics.

Specifically, the cross-section of the second connecting piece perpendicular to the thickness direction of the second connecting piece may be an incomplete circular ring (or arc) with an opening, that is, one end of the first connecting part 43 and the second connecting part 44 One end of the first connection part 43 is not connected to the other end of the second connection part 44 to form a ring opening, so that the cross section of the second connection piece is a non-complete ring with an opening, For example, it is a semicircular ring or the like. Generally, the outer edge of the second connecting piece is a circular arc, which is basically concentric with the outer edge of the casing, which is more conducive to the processing and positioning of the battery. The basic concentricity means that the concentricity of the two is within the error range, that is, due to The existence of processing errors usually cannot achieve complete concentricity, but can only strive for concentricity as much as possible.

In some embodiments, the second connecting piece may be welded on the metal sheet 2 , and the second welding mark produced by the welding penetrates the second connecting piece and extends to 1/3˜2/3 of the thickness of the metal sheet 2 . During specific implementation, the laser welding method can be used for welding. During the welding process, the second connecting piece is placed on the metal sheet 2, and then the laser is projected to the second connecting piece for welding, and the welding strength is controlled by adjusting the laser welding parameters, so that The generated second solder print runs through the second connecting piece and extends to 1/3-2/3 of the thickness of the metal sheet 2, that is, the length of the solder print generated in the metal sheet 2 in the thickness direction of the metal sheet 2 is about 1/3-2/3 of the thickness of the sheet 2 (that is, the penetration depth of the metal sheet 2 caused by the welding is about 1/3-2/3 of the thickness of the metal sheet 2). Wherein, the second connecting piece can specifically be welded on the metal sheet 2 through its first connecting portion 43 (that is, the first connecting portion 43 is welded to the metal sheet 2), and the second welding mark produced by the welding runs through the second connecting sheet. And extend to 1/3˜2/3 of the thickness of the first connecting portion 43 .

In addition, the first connecting piece 34 can be welded on the conductive member 5, and the first welding print produced by the welding runs through the first connecting piece 34 and extends to 1/3-2/3 of the thickness of the conductive member 5, which is beneficial to further improve Battery stability and other performance. During specific implementation, the laser welding method can be used for welding. During the welding process, the first connecting piece 34 is placed on the conductive member 5, and then the first connecting piece 34 is projected laser for welding, and the welding strength is controlled by adjusting the laser welding parameters. , so that the generated first solder print runs through the first connecting piece 34 and extends to 1/3-2/3 of the thickness of the conductive member 5, that is, the length of the solder print generated in the conductive member 5 in the thickness direction of the conductive member 5 It is about 1/3-2/3 of the thickness of the conductive member 5 (that is, the penetration depth of the conductive member 5 caused by the welding is about 1/3-2/3 of the thickness of the conductive member 5).

In this application, the conductive member 5 passes through the first through hole of the metal sheet 2 , the surface facing the cavity 6 is connected to the first tab, and the surface facing away from the cavity 6 is connected to the first connecting piece 34 of the first adapter 3 connected, and the conductive member 5 is insulated and connected to the metal sheet 2 through the insulating member 7, and the conductive member 5 and the metal sheet 2 can be fixed together through the insulating member 7 through thermocompression bonding, or fixed together by a rivet structure, That is, the top cover has a composite structure extruded from metal sheets, insulating parts and conductive parts. In some embodiments, the conductive part 5 includes a rivet, that is, the conductive part 5 can be a rivet structure, which can not only realize the electrical connection between the first adapter part 3 and the first tab, but also serve as a fixing structure for the top cover, so that The metal sheet 2, the insulating part 7 and the conductive part 5 are fixed together.

Specifically, the metal sheet 2 includes a third connection portion 21 and a fourth connection portion 22, the third connection portion 21 is connected to the housing 1, the fourth connection portion 22 is provided with the above-mentioned first through hole, and the conductive member 5 includes a third connection portion. piece, the fourth connecting piece, and the third vertical part connected between the third connecting piece and the fourth connecting piece, the insulator 7 includes the third insulating piece 71, the fourth insulating piece 72 and the first through The fifth insulating sheet on the side wall of the hole, the third vertical part passes through the first through hole and is insulated and connected with the side wall (ie metal sheet 2) of the first through hole through the fifth insulating sheet, and the fourth connecting part 22 , the third insulating sheet 71, and the third connecting sheet are stacked sequentially from bottom to top (that is, the third insulating sheet 71 is located on the surface of the fourth connecting portion 22 away from the cavity 6, and the third connecting sheet is located on the surface of the third insulating sheet 71 away from the first On the surface of four connecting parts 22), so that the third connecting piece is insulated and connected to the metal sheet 2, and the fourth connecting part 22, the fourth insulating piece 72, and the fourth connecting piece are stacked sequentially from top to bottom (that is, the fourth insulating piece The sheet 72 is located on the surface of the fourth connecting portion 22 facing the cavity 6, and the fourth connecting sheet is located on the surface of the fourth insulating sheet 72 away from the fourth connecting portion 22), so that the fourth connecting sheet is insulated and connected to the metal sheet 2, Thus, the conductive member 5 is insulated and connected to the metal sheet 2 . Wherein, the third insulating sheet 71 is provided with a second through hole communicated with the first through hole, the fourth insulating sheet 72 is provided with a third through hole communicated with the first through hole, and the third vertical part is sequentially arranged from top to bottom. through the second through hole, the first through hole and the third through hole. Specifically, the first tab can be welded on the fourth connecting piece, the first connecting piece 34 of the first adapter 3 is connected to the third connecting piece of the conductive member 5, specifically, it can be welded on the third connecting piece, and The formed first solder print penetrates the first connecting piece 34 and extends to 1/3˜2/3 of the thickness of the third connecting piece, so as to electrically connect the first adapter piece 3 to the first tab.

Optionally, the distance from the plane on which the surface of the third connecting piece faces away from the cavity 6 to the plane on which the surface of the third connecting portion 21 faces the cavity 6 is equal to or smaller than the distance from the plane on which the surface of the third connecting portion 21 faces away from the cavity 6 The distance from the plane to the surface of the third connecting portion 21 facing the cavity 6, that is, the surface of the third connecting piece facing away from the cavity 6 is not higher than the surface of the third connecting portion 21 facing away from the cavity 6, specifically, the metal sheet 2. There is a first groove located above the fourth connecting portion 22, and the first groove is surrounded by the third connecting portion 21 (that is, the side wall of the first groove is the third connecting portion 21, and the concave The bottom of the groove is the fourth connecting part 22), the third insulating sheet 71 and the third connecting sheet are sequentially arranged in the first groove, and the depth of the first groove is sufficient to make the third connecting sheet face away from the surface of the cavity 6 No higher than the surface of the third connecting portion 21 facing away from the cavity 6, for example, the surface of the third connecting sheet facing away from the cavity 6 can be substantially flat with the surface of the third connecting portion 21 facing away from the cavity 6, so that the surface of the top cover can be made more For flatness, reduce battery volume, and further optimize battery performance.

In addition, the distance from the plane where the surface of the fourth connecting piece faces the cavity 6 to the plane where the surface of the fourth connecting portion 22 faces away from the cavity 6 is equal to or smaller than the distance from the plane where the surface of the fourth connecting portion 22 faces the cavity 6 to The distance from the plane where the fourth connecting portion 22 is away from the surface of the cavity 6, that is, the surface of the fourth connecting piece facing the cavity 6 is not higher than the surface of the fourth connecting portion 22 facing the cavity 6, specifically, the metal sheet 2 is set There is a second groove located below the fourth connecting portion 22, the second groove is surrounded by the third connecting portion 21 (that is, the side wall of the second groove is the third connecting portion 21, the groove’s The bottom is the fourth connecting part 22), the fourth insulating sheet 72, and the fourth connecting sheet are sequentially arranged in the second groove, and the depth of the second groove satisfies that the surface of the fourth connecting sheet facing the cavity 6 is not high. On the surface of the fourth connecting portion 22 facing the cavity 6, for example, the surface of the fourth connecting sheet facing the cavity 6 can be substantially flat with the surface of the fourth connecting portion 22 facing the cavity 6, so that the surface of the top cover can be made more flat , reduce battery volume, and further optimize battery performance.

Optionally, the first lug may include a straight portion 8 connected to the battery core 9, the surface of the straight portion 8 perpendicular to the thickness direction of the straight portion and the surface of the conductive member facing the cavity 6 (that is, the above-mentioned fourth connecting piece is perpendicular to The surface in the thickness direction of the fourth connecting piece) is substantially parallel, and the straight portion 8 is welded on the fourth connecting piece to realize the connection between the conductive member and the first tab. In addition, a sixth insulating sheet 20 can also be provided on the surface of the metal sheet 2 facing the cavity 6, and the sixth insulating sheet 20 is located between the metal sheet 2 and the straight portion 8 of the first tab, so as to avoid contact between the first tab and the metal tab. A short circuit occurs in contact with the sheet 2, which further improves the performance of the battery such as safety and stability.

In this application, it also includes a second insulating sheet arranged on the side of the top cover away from the cavity 6, the orthographic projection of the second insulating sheet perpendicular to the thickness direction of the top cover covers the orthographic projection of the top cover perpendicular to the thickness direction of the top cover, that is The metal sheet 2, the part of the positive electrode adapter located on the top cover (such as the above-mentioned first connecting piece 34 and the horizontal part 33), and the part of the second adapter 4 located on the top cover (such as the above-mentioned second connecting piece) are all covered. Covering with the second insulating sheet is beneficial to further improve the safety and other performances of the battery, and prevent short circuits when the battery is assembled in terminal products (such as wearable electronic products, etc.) or during transportation and use.

In general, the above-mentioned cell 9 includes a positive electrode sheet, a negative electrode sheet, and a diaphragm between the positive electrode sheet and the negative electrode sheet. Conventional positive electrode sheets, negative electrode sheets and separators in the field are used, and there is no special limitation thereto. The polarities of the above-mentioned first tab and the second tab are opposite, one of which is used as a positive tab and is electrically connected to the positive sheet, and the other is used as a negative tab and is electrically connected to the negative sheet. It is generally preferred that the first tab is positive pole tab, and the second pole tab is the negative pole tab.

The above-mentioned electric core 9 can be a winding electric core 9 (or called a winding core) in a winding structure, that is, the positive electrode sheet, the diaphragm, and the negative electrode sheet are stacked in sequence and then wound to form a winding structure. It is a laminated battery cell 9 with a laminated structure, that is, the positive electrode sheet, the diaphragm, and the negative electrode sheet are stacked in sequence to form a laminated structure, but it is not limited thereto.

In addition, the number of electric cores 9 located in the cavity 6 can be one or more. When the number of electric cores 9 is multiple, the positive plates of all electric cores 9 are connected to the above-mentioned positive pole lugs, and all electric cores 9 The negative electrode sheets are all connected to the above-mentioned negative electrode lugs.

In this application, the above-mentioned first tab, second tab, housing 1, metal sheet 2, conductive member 5, first adapter 3, and second adapter 4 can all be conventional conductive materials in the field, for example Metal materials, etc., for example, the first adapter 3 can be made of nickel or stainless steel, that is, a nickel sheet or a stainless steel sheet, and the second adapter 4 can be made of nickel or stainless steel, that is, a nickel sheet or stainless steel sheet. The insulating components such as the first insulating sheet, the second insulating sheet, the insulating member 7, the insulating layer, the sixth insulating sheet 20, and the seventh insulating sheet 10 may be formed by conventional insulating glue in the field, such as insulating glue made of polypropylene PP glue, etc. During specific implementation, the insulating glue can be pasted first and then the corresponding welding process can be carried out to assemble the above-mentioned battery. For example, a layer of insulating glue can be pasted on the side of the casing 1 before the positive electrode connector is welded on the top cover. and the negative electrode connector, first attach a layer of insulating glue on the surface of the metal sheet 2 facing the cavity 6, and then weld the first tab to the conductive member 5.

The embodiments of the present application have been described above. However, the present application is not limited to the above-mentioned embodiments. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included within the protection scope of this application.

Claims

A battery, characterized in that it includes a casing, a top cover and an electric core, the top cover covers the upper end of the casing and forms a cavity with the casing, the electric core is located in the In the cavity, the electric core has a first tab and a second tab, and the polarity of the first tab and the second tab are opposite; the top cover includes a metal sheet, an insulating part, a conductive part and a second tab. An adapter, wherein the second tab is electrically connected to the metal sheet, the second adapter includes a second connecting sheet and a second pin arranged on the second connecting sheet, the first The two adapters are connected to the metal sheet through the second connecting piece, one end of the second pin is connected to the second connecting piece, and the other end of the second pin extends out of the top cover outer edge.
The battery according to claim 1, wherein the second connection piece comprises a first connection part, a second connection part, and a transition part connected between the first connection part and the second connection part, the The first connection part is welded on the metal sheet; the top surface of the second connection part is higher than the top surface of the first connection part, and/or, the bottom surface of the second connection part is higher than the first connection part bottom of the connection.
The battery according to claim 1, wherein the top cover further includes a first insulating sheet, and the second connecting sheet includes a first connecting portion, a second connecting portion, and a connection between the first connecting portion and the second connecting portion. In the transition part between the two connecting parts, the first connecting part is welded on the metal sheet, and the second connecting part is connected to the metal sheet through the first insulating sheet.
The battery according to claim 3, wherein the thickness of the first insulating sheet is 0.05mm-0.1mm.
The battery according to any one of claims 1-4, wherein the metal sheet is provided with a first through hole communicating with the cavity, the conductive member is provided at the first through hole, It is insulated and connected to the metal sheet through the insulating member, and the first through hole is sealed, and the conductive member is electrically connected to the first tab; the battery also includes a first adapter, the The first adapter includes a first connecting piece and a first pin arranged on the first connecting piece, one end of the first pin is connected with the first connecting piece, and the other end of the first pin extends Out of the outer edge of the top cover, the first transition piece is connected to the conductive piece through the first connecting piece.
The battery according to claim 5, wherein the casing is provided with an insulating layer and satisfies at least one of the following characteristics:

The part where the other end of the first pin protrudes from the outer edge of the top cover is a first adapter, and the first pin also includes a first extension extending to the side wall of the housing. A connection piece is connected to one end of the first extension part, the first adapter is connected to the other end of the first extension part, and the first extension part is insulated from the housing through the insulating layer;

The part where the other end of the second pin protrudes from the outer edge of the top cover is a second adapter, and the second pin also includes a second extension extending to the side wall of the housing. Two connecting pieces are connected to one end of the second extension part, the second adapter is connected to the other end of the second extension part, and the second extension part is connected to the housing through the insulating layer .
The battery according to claim 6, wherein the second pins include positioning pins and conductive pins, and in the direction from the bottom plate of the housing to the top cover, the second adapter of the positioning pins The distance to the top cover is greater than or equal to the distance from the second adapter of the conductive pin to the top cover, and/or, the distance from the second adapter of the positioning pin to the top cover is greater than Or equal to the distance from the first adapter of the first pin to the top cover.
The battery according to claim 5, wherein the second pins include positioning pins and conductive pins, and in the projection of the battery perpendicular to the direction from the bottom plate of the casing to the top cover, the positioning pins A pin is located between the conductive pin and the first pin.
The battery according to claim 5, characterized in that,

The second connecting piece includes a first connecting portion, a second connecting portion, and a transition portion connected between the first connecting portion and the second connecting portion, the first connecting portion is welded on the metal sheet; the The top surface of the second connection part is higher than the top surface of the first connection part, and/or, the bottom surface of the second connection part is higher than the bottom surface of the first connection part;

The part where the other end of the first pin protrudes from the outer edge of the top cover is a first adapter, and the part where the other end of the second pin protrudes from the outer edge of the top cover is a second adapter; The second pin includes a conductive pin and a positioning pin, and in the orthographic projection of the top cover perpendicular to the thickness direction of the top cover, the second adapter of the positioning pin is located on the first pin Between the first adapter and the second adapter of the conductive pin; and the angle between the first connection line and the second connection line is α, α>30°, and the first connection line passes through the The center point of the orthographic projection of the top cover bisects the straight line of the transition portion, and the second connecting line passes through the center point of the orthographic projection of the top cover and bisects the second adapter of the positioning pin.
The battery according to claim 9, wherein 60°≤α≤140°.
The battery according to claim 10, wherein 100°≤α≤125°.
The battery according to any one of claims 2, 3 or 9, wherein the second pin is arranged on the second connection part.
The battery according to any one of claims 2, 3 or 9, characterized in that, the second welding mark generated by the welding runs through the second connection part and extends to 1/3-2 of the metal sheet /3 thickness.
The battery according to claim 5, wherein the top cover further comprises a seventh insulating sheet, and the first pin is insulated from the metal sheet through the seventh insulating sheet.
The battery according to claim 14, characterized in that the thickness of the seventh insulating sheet is 0.05mm-0.1mm.
The battery according to claim 5, characterized in that,

The first connecting piece is welded on the conductive member, and the first welding mark produced by the welding passes through the first connecting piece and extends to 1/3˜2/3 of the thickness of the conductive member.
The battery of claim 5, wherein the conductive member comprises a rivet.
The battery according to claim 5, wherein the first adapter is located on a side of the conductive member away from the cavity.
The battery according to claim 1 or 2, wherein the outer peripheral edge of the metal sheet is welded to the upper end of the casing, so that the top cover is sealed on the upper end of the casing.
The battery according to claim 1 or 2, wherein the cross-section of the second connecting piece perpendicular to the thickness direction of the second connecting piece is a non-complete circular ring with an opening.
The battery according to claim 1 or 2, wherein the outer edge of the second connecting piece is an arc, and the arc is substantially concentric with the outer edge of the casing.
The battery according to claim 1 or 2, wherein the second adapter is located on a side of the metal sheet facing away from the cavity.
The battery according to claim 1 or 2, further comprising a second insulating sheet arranged on the side of the top cover away from the cavity, the second insulating sheet is perpendicular to the thickness of the top cover The orthographic projection of the direction covers the orthographic projection of the roof perpendicular to the thickness direction of the roof.
The battery according to claim 1 or 2, wherein the first tab is a positive tab, and the second tab is a negative tab.
The battery according to claim 1 or 2, wherein the battery is a button battery.