CN213483795U

CN213483795U - Battery with a battery cell

Info

Publication number: CN213483795U
Application number: CN202022712872.4U
Authority: CN
Inventors: 韩好; 孙威; 王泽宇; 张婷婷
Original assignee: Sichuan Xinminya Battery Technology Co Ltd; Suzhou Lingwei New Energy Technology Co Ltd; Hunan Lingpai New Energy Technology Co Ltd
Current assignee: Hunan Lingpai Energy Storage Technology Co ltd; Hunan Lingpai New Energy Research Institute Co ltd; Hunan Lingpai New Energy Technology Co Ltd; Hengyang Lingpai New Energy Technology Co Ltd; Hunan Lead Power Dazhi Technology Inc
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-06-18
Anticipated expiration: 2030-11-20

Abstract

The present application provides a battery. The battery includes: a housing including a first receiving chamber, the first receiving chamber including a first opening; a cover plate closing the first opening; and a first reel assembly, in the first accommodating cavity, comprising: first lamination core, including first core main part and with the first core utmost point ear that first core main part is connected, the core is rolled up to the second lamination, including the second core main part and with the second core utmost point ear that the core main part is connected is rolled up to the second to and the connection piece, one end with first core utmost point ear with the second core utmost point ear is rolled up to the second and is connected, and the other end is with the cover connection, wherein, first core utmost point ear with the second core utmost point ear is connected to respectively the different positions of connection piece.

Description

Battery with a battery cell

Technical Field

The utility model relates to a battery field, in particular to battery.

Background

In recent years, with the support and guidance of national strategies, the development of the new energy automobile industry enters a brand-new stage. The industry and the letter issue new energy automobile industry development planning (2021-. How to further improve the popularization rate of new energy automobiles becomes the development focus of the next stage.

The endurance mileage is a restriction factor for consumers to select new energy automobiles. Anxiety about endurance mileage is a constant topic for this few years. In order to further improve the endurance mileage of the new energy automobile, the charge capacity of the whole automobile needs to be further increased. Compared with battery production enterprises, products with higher energy density and higher volume density are needed to meet the market demands on the premise of ensuring safety.

The mainstream power batteries in the industry mainly comprise three types, namely square, soft package, cylinder and the like. Among these, in the existing power battery market, the market share of prismatic batteries accounts for 85% of the total loading due to module grouping efficiency and cost advantages. The cells of the prismatic battery may be of a wound or laminated construction.

Due to the structural characteristics of the battery cell, the battery cell with the winding structure cannot fully utilize the space inside the battery cell like a battery cell with a lamination structure; this disadvantage is particularly pronounced for cells of large dimensions, in the case of cells of the wound structure. Therefore, the application of the winding core of the laminated structure in the large-size battery cell is a concept of the existing design for improving the energy density of the battery cell.

The number of layers of the pole ear in the manufacturing process of the laminated winding core is 2 times that of the winding core of the winding structure, and the number of layers of the laminated winding core (the number of layers of the pole piece) of the large-size cell is more than 50. In the existing manufacturing process, on one hand, when the number of the overlapped layers of the two winding core tabs exceeds 100, the existing ultrasonic welding technology cannot ensure the ultrasonic welding quality of the tabs; on the other hand, when the thickness of lamination is great, the length of rolling up a core utmost point ear can increase a lot, influences the yields that the core pole piece section was made.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model discloses a battery.

The battery disclosed in the present application includes: a housing including a first receiving chamber, the first receiving chamber including a first opening; a cover plate closing the first opening; and a first reel assembly, in the first accommodating cavity, comprising: first lamination core, including first core main part and with the first core utmost point ear that first core main part is connected, the core is rolled up to the second lamination, including the second core main part and with the second core utmost point ear that the core main part is connected is rolled up to the second to and the connection piece, one end with first core utmost point ear with the second core utmost point ear is rolled up to the second and is connected, and the other end is with the cover connection, wherein, first core utmost point ear with the second core utmost point ear is connected to respectively the different positions of connection piece.

In some embodiments, the first and second core tabs are each sheet-like; and the first winding core lug and the second winding core lug are at least partially attached.

In some embodiments, the connecting piece includes a first connecting portion, a second connecting portion, and a third connecting portion, which are connected in sequence, wherein: the first connecting part is connected with the cover plate; the second connecting part is connected with the first winding core tab; and the third connecting part is connected with the second winding core lug.

In some embodiments, the second connection portion comprises a second surface; the third connecting portion includes a third surface facing the second surface and spaced apart from the second surface; and first core utmost point ear with second core utmost point ear is located the second surface with between the third surface, first core utmost point ear is connected the second is surperficial, and second core utmost point ear is connected the third is surperficial.

In some embodiments, the connecting piece is folded in a zigzag shape.

In some embodiments, the first connection portion, the second connection portion, and the third connection portion may be flattened to the same plane.

In some embodiments, the connecting piece is L-shaped when the first connecting portion, the second connecting portion, and the third connecting portion are flattened to the same plane.

In some embodiments, the connecting piece is connected with the cover plate by laser welding, and the connecting piece is connected with the first winding core tab and the second winding core tab by ultrasonic welding.

In some embodiments, the first core tab comprises a first core tab and a first core tab, the second core tab comprises a second core tab and a second core tab, and the connection tabs comprise a positive connection tab and a negative connection tab; the first winding core positive lug and the second winding core positive lug are respectively connected to different parts of the positive connecting sheet; and the first winding core negative electrode lug and the second winding core negative electrode lug are respectively connected to different parts of the negative electrode connecting sheet.

In some embodiments, an overflow aperture is disposed on at least one of the positive and negative connection tabs.

In some embodiments, the positive connecting tab is a single layer of aluminum or aluminum alloy sheet, or a composite structure including more than one layer of aluminum or aluminum alloy sheet.

In some embodiments, the negative connection tab is a single layer of copper or copper alloy sheet, or a composite structure including more than one layer of copper or copper alloy sheet.

In some embodiments, the battery further comprises a second roll core assembly having a structure that is symmetrical to the structure of the first roll core assembly.

In some embodiments, the attachment tab of the second core assembly and the attachment tab of the first core assembly are attached to different areas of the cover sheet, respectively.

In summary, the present application provides a battery. The battery of the present application:

firstly, the core tab of the first laminated core 410 (i.e. the first core tab 412) and the core tab of the second laminated core 420 (i.e. the second core tab 422) are respectively connected to different positions (i.e. the second connecting portion 432 and the third connecting portion 433) on the connecting sheet 430, so that the core tab of the first laminated core 410 and the core tab of the second laminated core 420 do not need to be superposed for welding, the welding difficulty is reduced, and the number of layers of ultrasonic welding can be effectively ensured not to exceed the equipment limit;

secondly, the first connecting portion 431, the second connecting portion 432 and the third connecting portion 433 are sequentially folded, so that the winding core tabs of the first laminated winding core 410 and the second laminated winding core 420 are connected with the pole 330, the space inside the shell 200 is effectively utilized, and the energy density of the battery 100 can be further improved;

again, set up first core utmost point ear 412 and second core utmost point ear 422 in the space that forms after second connecting portion 432 and third connecting portion 433 are folded: on the one hand, space is effectively utilized; on the other hand, the second connecting portion 432 and the third connecting portion 433 limit the first winding core tab 412 and the second winding core tab 422 in the space, so that the first winding core tab 412 and the second winding core tab 422 can be protected, supported and fixed, and the first winding core tab 412 and the second winding core tab 422 can be prevented from being loose.

Drawings

Fig. 1 is a schematic external view of a battery provided according to an embodiment of the present application;

FIG. 2 illustrates a schematic structural diagram of a housing provided in accordance with an embodiment of the present application;

FIG. 3 illustrates a schematic structural diagram of a cover plate and a first reel assembly provided according to an embodiment of the present application;

FIG. 4 shows a detailed view of region A of FIG. 3;

FIGS. 5A and 5B illustrate front and left side views, respectively, of a first laminated core provided in accordance with an embodiment of the present application;

fig. 6A and 6B respectively show a schematic structural diagram of a negative connection piece after being flattened and a schematic structural diagram of a positive connection piece after being flattened, according to an embodiment of the present application;

7A, 7B and 7C respectively show a right side view, a front view and a top view of a negative connecting sheet after being bent according to an embodiment of the application;

8A, 8B and 8C respectively show a front view, a top view and a left side view after bending a positive connecting sheet provided by the embodiment of the application;

fig. 9A and 9B respectively show a bent perspective view of a negative connecting sheet and a bent perspective view of a positive connecting sheet according to an embodiment of the present application;

fig. 10 shows a flow chart of a method of manufacturing a battery according to an embodiment of the present application;

11A and 11B show a right side view and a front view, respectively, of a first lamination core, a second lamination core, and a connection tab placement location provided in accordance with an embodiment of the present application;

12A and 12B illustrate a right side view and a front view, respectively, of a side of a first lamination core and a side of a second lamination core, respectively, provided in accordance with an embodiment of the present application;

fig. 12C shows an isometric view of a first laminated core and a second laminated core after attaching the sides of the first and second laminated cores in accordance with an embodiment of the present application;

fig. 12D shows a schematic structural diagram of a first core assembly after bending a core tab according to an embodiment of the present application;

fig. 13A is a schematic structural diagram illustrating a cover plate according to an embodiment of the present application;

13B and 13C show front and bottom views, respectively, of the placement of a cover sheet, a first core assembly, and a second core assembly provided in accordance with an embodiment of the present application; and

figure 14 illustrates an isometric view of an assembly after attaching a side of a first core assembly to a side of a second core assembly provided in accordance with an embodiment of the present application.

Detailed Description

The following description is presented to enable any person skilled in the art to make and use the invention, and is provided in the context of particular applications and its requirements. Various modifications to the disclosed embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other embodiments and applications without departing from the spirit and scope of the present application. Thus, the present application is not limited to the embodiments shown, but is to be accorded the widest scope consistent with the claims.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting.

These and other features of the present application, as well as the operation and function of the related elements of structure and the combination of parts and economies of manufacture, may be significantly improved upon consideration of the following description. All of which form a part of this application, with reference to the accompanying drawings. It is to be expressly understood, however, that the drawings are for the purpose of illustration and description only and are not intended as a definition of the limits of the application.

These and other features of the present application, as well as the operation and function of the related elements of the structure, and the economic efficiency of assembly and manufacture, are significantly improved by the following description. All of which form a part of this application with reference to the accompanying drawings. It is to be expressly understood, however, that the drawings are for the purpose of illustration and description only and are not intended as a definition of the limits of the application. It should also be understood that the drawings are not drawn to scale.

Fig. 1 shows an external view of a battery 100 provided according to an embodiment of the present application. The battery 100 may be a lithium ion battery, a hydrogen fuel cell, or the like. The battery 100 may be applied to various fields, for example, the battery 100 may be a mobile phone battery, a computer battery, an automobile battery, an unmanned aerial vehicle battery, a ship battery, or the like. Specifically, the battery 100 may include a case 200, a cap plate 300, and a first reel assembly 400 (not shown in fig. 1).

Fig. 2 shows a schematic structural diagram of a housing 200 according to an embodiment of the present application.

Referring to fig. 2, the housing 200 may include a receiving chamber 210. The first reel assembly 400 is accommodated in the accommodating cavity 210. The receiving cavity 210 is used for receiving the first reel assembly 400, and provides effective binding and protection for the first reel assembly 400. The case 200 may be made of a conductive metal material. Such as aluminum, aluminum alloys, and the like. The housing 200 may be hermetically connected to the cap plate 300 by welding. The housing 200 may be sealed with the cover plate 300 in other manners. The receiving cavity 210 may include a first opening 211.

Fig. 3 shows a schematic structural diagram of a cover plate 300 and a first reel assembly 400 provided according to an embodiment of the present application. Fig. 4 shows a detailed view of region a in fig. 3.

Referring to fig. 3 and 4, the first reel assembly 400 may be disposed in the accommodating cavity 210. The first core assembly 400 may include a first lamination core 410, a second lamination core 420, and a connecting tab 430.

The first and second

laminated cores

410 and 420 are connected in series or in parallel to form the first core assembly 400.

Fig. 5A and 5B illustrate front and left side views, respectively, of a first laminated core 410 provided in accordance with an embodiment of the present application. The first laminated core 410 may include a first core body 411 and a first core tab 412 on the first core body 411.

The first roll core body 411 may include at least one positive electrode sheet, at least one separator, and at least one negative electrode sheet. The first winding core body 411 is formed by sequentially stacking the at least one positive electrode sheet, the at least one separator, and the at least one negative electrode sheet. The stacking structure can be a Z-shaped stacking structure, namely the diaphragm separates the adjacent positive plate and the negative plate in a Z shape, each stacking structure comprises one positive plate and one negative plate, and the diaphragm can separate and coat the positive plate and the negative plate. By adopting the zigzag lamination, the internal structure of the first winding core body 411 is consistent, and the thickness of each part is correspondingly consistent. Therefore, the thickness of the first spool body 411 is more easily controlled. Meanwhile, the zigzag stacking structure enables the internal structure of the first winding core body 411 to be the same, so that the reaction rates of the positive and negative electrodes at different positions in the first winding core body 411 are relatively consistent, and the first winding core body 411 is not easy to deform.

In some embodiments, the first winding core body 411 includes more than 30 stacked structures sequentially arranged, including a positive electrode sheet, a separator, and a negative electrode sheet in this order. Optionally, the first winding core body 411 includes at least 50 stacked structures arranged in series, and each stacked structure includes a positive electrode sheet, a separator, and a negative electrode sheet.

The outermost layer of the first bobbin body 411 may be wrapped with an insulating film to prevent the first bobbin body 411 from directly contacting the case 200.

A first mandrel tab 412 is located on the first mandrel body 411. In some embodiments, a first mandrel tab 412 is located at one end of the first mandrel body 411. In some embodiments, the first mandrel tab 412 may be disposed proximate to an edge of the first mandrel body 411 facing the surface 406 of the cover plate 300 (such as shown in fig. 5B).

Referring to fig. 5A, the first winding core tab 412 may include a first winding core negative tab 412-1 and a first winding core positive tab 412-2.

The first winding core positive tab 412-2 includes more than one positive tab. The first ends of the more than one positive lugs are connected together. The first ends of the more than one positive lugs are connected together and then are connected with the positive connecting sheet. The connection may be by welding. The first ends of the more than one positive lugs are connected together, so that the more than one positive lugs can be prevented from being loosened in the process of order changing and can be effectively welded with the positive connecting sheet. The second ends of the more than one positive tab are respectively connected to the more than one positive tab in the first winding core body 411; the connection may be an integral connection; for example, an aluminum foil partially coated with a positive electrode material is cut by a die to obtain a pole piece including a positive electrode piece and a positive electrode tab.

The first winding core negative tab 412-1 includes more than one negative tab. The first ends of the more than one negative electrode tab are connected together. The first ends of the more than one negative electrode lug are connected together and then connected with the negative electrode connecting sheet. The connection may be by welding. The first ends of the more than one negative pole lug are connected together, so that the more than one negative pole lug can be ensured not to be loosened in the sequence turning process and can be effectively welded with the negative pole connecting sheet. The one or more negative tab second ends are respectively connected to the one or more negative plates in the first bobbin body 411; the connection may be an integral connection; for example, the copper foil partially coated with the negative electrode material is cut by a die to obtain the electrode sheet including the negative electrode sheet and the negative electrode tab.

With continued reference to fig. 3 and 4, the second laminated core 420 has the same or similar structure as the first laminated core 410. The second laminated core 420 can include a second core body 421 and a second core tab 422 on the second core body 421. In some embodiments, a second jellyroll tab 422 is located at one end of the second jellyroll body 421. In some embodiments, the second core tab 422 may be disposed near the edge of the surface of the second core body 421 facing the cover sheet 300. In some embodiments, the position of the second core tab 422 in the second laminated core 420 may be symmetrical to the position of the first core tab 412 in the first laminated core 410 (such as shown in fig. 4).

With continued reference to fig. 3 and 4, the cover plate 300 may be assembled with the housing 200 and close the first opening 211 of the receiving cavity 210. The closed space formed after the cover plate 300 is assembled with the housing 200 may completely enclose the first reel assembly 400.

Referring to fig. 1, the cap plate 300 may be provided with a pole 330. The post 330 may include a negative post 331 and a positive post 332. The pole 330 may be made of a conductive material. The terminal 330 is a contact point for electrically connecting the battery 100 to an external device and charging and discharging the battery.

Referring to fig. 3 and 4, after the cover plate 300 is assembled with the housing 200, one end of the terminal post 330 is exposed at the outermost side of the battery 100; the other end of the post 330 is electrically connected to the first and

second core tabs

412, 422 at the inside of the battery 100 via a connecting tab 430.

With continued reference to FIG. 1, the lid 300 may be provided with a pour spout 310. After the cover plate 300 is assembled to the case 200, the electrolyte may be injected into the interior of the receiving chamber 210 through the injection hole 310. The electrolyte may be in a liquid state and filled in the accommodating chamber 210. The positive plate, the negative plate and the diaphragm are soaked in the electrolyte. Taking a lithium ion battery as an example, the electrolyte has the functions of: in one aspect, the electrolyte may provide a portion of the active lithium ions, which may be used as conductive ions during charging and discharging; on the other hand, the electrolyte may provide an ion channel that allows lithium ions to move freely inside the case 200.

With continued reference to fig. 3 and 4, the cover plate 300 may also be provided with an insulating material 320. An insulating material 320 may be disposed between the cover plate 300 and the first spool assembly 400. The insulating material 320 may prevent the cover plate 300 from directly contacting the first reel assembly 400, thereby improving safety.

One end of the connecting piece 430 is connected to the first winding core tab 412 and the second winding core tab 422, and the other end is connected to the cover plate 300. The connecting pad 430 may be made of a conductive material. The tab 430 may ensure electrical communication between the post 330 and the first and

second core tabs

412 and 422.

According to the battery 100 described herein, the first and

second roll tabs

412 and 422 are attached to different portions of the connecting tab 430. Like this, through the core utmost point ear (being first core utmost point ear 412) that rolls up core 410 with first lamination and the core utmost point ear (being the second core utmost point ear 422) that rolls up core 420 of second lamination are connected to different positions (being second connecting portion 432 and third connecting portion 433) on the connection piece 430 respectively, the core utmost point ear that rolls up core 410 of first lamination and the core utmost point ear that rolls up core 420 of second lamination need not superpose and get up and weld, have reduced the welded degree of difficulty, have solved the technical problem that this application needs to solve.

With continued reference to fig. 4, in some embodiments, the connection tab 430 may include a first connection portion 431, a second connection portion 432, and a third connection portion 433. The first connection part 431, the second connection part 432, and the third connection part 433 may be connected in sequence. The first connection portion 431 may be connected to the cover plate 300; the second connection portion 432 may be connected to the first core tab 412; and the third connection portion 432 may be connected to the second core tab 422.

Referring to fig. 4, the first connection portion 431, the second connection portion 432, and the third connection portion 433 of the connection sheet 430 may be folded in a zigzag shape. Note that the zigzag folding is merely used to indicate a folded state, the size of each portion folded with each other (for example, the size of the first connection portion 431, the second connection portion 432, and the third connection portion 433) is not limited to the present application, and the direction of the zigzag folding is not limited to the present application.

First connecting portion 431, second connecting portion 432 and third connecting portion 433 are folded in proper order, and when the realization was rolled up the core utmost point ear of first lamination core 410 and second lamination core 420 and was connected with utmost point post 330, effectively utilized the inside space of casing 200, and then can promote battery 100's energy density.

With continued reference to fig. 4, the space formed by the folded second and third connecting

portions

432 and 433 may partially accommodate the first and second core tabs 412 and 423. For example, the second connection portion 432 may include a second surface S; the third connection portion 433 may include a third surface T. After the second and third connecting

portions

432 and 433 are folded along the folded portion N, the third surface T faces the second surface S and is spaced apart from the second surface S. The first and

second core tabs

412, 422 may be located in a space between the second surface S and the second surface T.

Set up first core utmost point ear 412 and second core utmost point ear 422 in the space that forms after second connecting portion 432 and third connecting portion 433 are folded: on the one hand, space is effectively utilized; on the other hand, the second connecting portion 432 and the third connecting portion 433 limit the first winding core tab 412 and the second winding core tab 422 in the space, so that the first winding core tab 412 and the second winding core tab 422 can be protected, supported and fixed, and the first winding core tab 412 and the second winding core tab 422 can be prevented from being loose.

Further, a first core tab 411 is attached to the second surface S, and a second core tab 421 is attached to the third surface T. In this way, the folded opposite surfaces of the second connecting portion 432 and the third connecting portion 433, i.e., the second surface S and the third surface T, ensure that the first winding core tab 412 and the second winding core tab 422 are connected to different positions of the connecting sheet 430.

For convenience of description, in the following description of the present application, a connection position of the first connection part 431 and the second connection part 432 is denoted as a "first bent part M", and a connection position of the second connection part 432 and the third connection part 433 is denoted as a "second bent part N".

With continued reference to fig. 4, the first connection portion 431, the second connection portion 432, and the third connection portion 433 may be flattened to the same plane. In some embodiments, when the first connection portion 431, the second connection portion 432, and the third connection portion 433 are flattened to the same plane, the connection piece 430 may have an L-shape.

The connection tabs 430 may include a negative connection tab and a positive connection tab. For the sake of distinction, in the following description of the present application, the negative electrode connecting piece is denoted by "10" and the positive electrode connecting piece is denoted by "20".

As an example, fig. 6A and 6B respectively show a schematic structural view after a negative connection tab 10 is flattened and a schematic structural view after a positive connection tab 20 is flattened, which are provided according to an embodiment of the present application.

Referring to fig. 6A, the flattened negative electrode connection tab 10 is in the form of a sheet. The first connecting part of the negative connecting piece 10 is 11; the second connecting part of the negative electrode connecting piece 10 is 12; the third connecting portion of the negative electrode connecting piece 10 is 13. The connection part of the first connection part 11 and the second connection part 12 is a first bending part M-1, and the connection part of the second connection part 12 and the third connection part 13 is a second bending part N-1. The flattened negative electrode connecting sheet 10 is substantially L-shaped. Of course, the negative electrode connecting piece 10 may have other shapes in the unfolded state, including, but not limited to, a T-shape, a straight line shape, and the like. According to the battery 100 described herein, the developed shape of the negative electrode tab 10 may be any shape without departing from the core spirit of the present application. The first and

second connection parts

11 and 12 may be bent along the first bent part M-1. The angle of the bend may comprise any value from 0 ° to 180 °. For example, when the bending angle is 180 °, the first connection portion 11 and the second connection portion 12 are attached to each other, that is, the first connection portion 11 and the second connection portion 12 are folded along the first bending portion M-1 (as shown in fig. 4).

As an example, fig. 7A, 7B and 7C respectively show a right view, a front view and a top view of a negative connecting piece 10 provided according to an embodiment of the present application after being bent by 90 ° along a bending portion M-1.

The negative connection tab 10 may be a single-layer copper or copper alloy tab. The negative electrode connecting piece 10 may also be a composite structure including one or more layers of copper sheets or copper alloy sheets. The thickness of the negative electrode connecting piece 10 is not more than 2 mm.

The negative connection tab 10 connects the negative post of the end cap 300 to the negative tab of the first laminated core 410 (i.e., the first core negative tab 412-1) and the negative tab of the second laminated core 420 (i.e., the second core negative tab 422-1).

The negative pole of the end cap 300 may be connected to the first connection portion 11 of the negative pole connection piece 10, for example, the first connection portion 11 of the negative pole connection piece 10 and the negative pole may be welded together by ultrasonic welding.

The negative electrode tabs of the first laminated core 410 and the negative electrode tabs of the second laminated core 420 may be connected to the second connection part 12 and the third connection part 13 of the negative electrode connecting tab 10, respectively. For example, laser welding may be used to weld the negative electrode tabs of the first lamination core 410 to the second connection portions 12 of the negative electrode connection tabs 10 and weld the negative electrode tabs of the second lamination core 420 to the third connection portions 13 of the negative electrode connection tabs 10.

Therefore, the second connecting portion 12 and the third connecting portion 13 of the negative electrode connecting sheet 10 can be used for respectively connecting the negative electrode tab of the first laminated winding core 410 and the negative electrode tab of the second laminated winding core 420 to different positions of the connecting sheet, and the negative electrode tab of the first laminated winding core 410 and the negative electrode tab of the second laminated winding core 420 do not need to be overlapped for welding, so that the welding difficulty is reduced.

Referring to fig. 6B, the flattened positive electrode tab 20 is in the form of a sheet. The first connecting portion of the positive electrode connecting piece 20 is 21; the second connecting portion of the positive electrode connecting piece 20 is 22; the third connecting portion of the positive electrode tab 20 is 23. The connection part of the first connection part 21 and the second connection part 22 is a first bent part M-2, and the connection part of the second connection part 22 and the third connection part 23 is a second bent part N-2. The flattened positive electrode tab 20 is generally L-shaped. Of course, the positive connection tab 20 may have other shapes in the unfolded state, including, but not limited to, a T-shape, a straight line shape, and the like. According to the battery 100 described herein, the developed shape of the positive electrode tab 20 may be any shape without departing from the core spirit of the present application. The first and

second connection parts

21 and 22 may be bent along the first bent part M-2. The angle of the bend may comprise any value from 0 ° to 180 °. For example, when the bending angle is 180 °, the first connection portion 21 and the second connection portion 22 are attached to each other, that is, the first connection portion 21 and the second connection portion 22 are folded along the first bending portion M-2.

Fig. 8A, 8B and 8C respectively show a front view, a top view and a left view of a positive electrode connecting sheet 20 provided according to an embodiment of the present application after being bent by 90 ° along a bent portion M-2 thereof.

The positive electrode tab 20 may be a single layer of aluminum or aluminum alloy. The positive electrode tab 20 may also be a composite structure including more than one layer of aluminum or aluminum alloy sheet. The thickness of the positive electrode tab 20 is not more than 2 mm.

The positive tab 20 connects the positive post of the end cap 300 to the positive tab of the first lamination core 410 and the positive tab of the second lamination core 420.

The positive post of the end cap 300 may be connected to the first connection portion 21 of the positive tab 20, for example, ultrasonic welding may be used to weld the first connection portion 21 of the positive tab 20 and the positive post together.

The positive ears of the first laminated core 410 (i.e., the first core tab 412-2) and the positive ears of the second laminated core 420 (i.e., the second core tab 422-2) can be connected to the second connection portion 22 and the third connection portion 23, respectively, of the positive tab 20. For example, laser welding may be used to weld the positive tab of the first lamination core 410 to the second connection portion 22 of the positive connection tab 20 and to weld the positive tab of the second lamination core 420 to the third connection portion 23 of the positive connection tab 20.

Thus, the positive tab of the first lamination winding core 410 and the positive tab of the second lamination winding core 420 can be connected to different positions of the connecting sheet respectively by using the second connecting portion 22 and the third connecting portion 23 of the positive connecting sheet 20, and the positive tab of the first lamination winding core 410 and the positive tab of the second lamination winding core 420 do not need to be overlapped and welded, so that the welding difficulty is reduced.

In some embodiments, an overflow aperture is provided on at least one of the positive and

negative connection tabs

20, 10. For example, in fig. 8A, the positive electrode connecting piece 20 may be provided with an overflowing hole 24. The overflow aperture 24 may be a through hole. The shape of the overflow aperture 24 may be any shape. By way of example, the overflow aperture 24 may be circular or square. Of course, the overflow aperture 24 may be other shapes. The overflowing hole 24 may protect a cell or a charging and discharging device of the battery 100 when a current for charging and discharging the battery 100 is excessive or short-circuited. For example, when the current of the circuit is too large, the current flowing through the edge 25 of the current hole 24 is too large, and the size of the edge 25 is small, so that when the current exceeds the fusing current, the edge 25 can be fused, and the circuit is disconnected, that is, the circuit is protected. The overflowing hole 24 may be provided at any portion of the positive electrode connecting piece 20, for example, the overflowing hole 24 may be provided on the first connecting portion 21. Of course, in some embodiments, the negative connecting piece 10 may also be provided with an overflowing hole.

As an example, fig. 9A and 9B respectively show a bent perspective view of a negative electrode connecting piece 10 and a bent perspective view of a positive electrode connecting piece 20 according to an embodiment of the present application.

With continued reference to fig. 3, in some embodiments, the battery 100 may also include a second jellyroll assembly 500. The structure of the second core assembly 500 is symmetrical to the structure of the first core assembly 400. For example, second core assembly 500 can include laminated core 510, laminated core 520, and connecting tabs 530. For brevity, the structure of the second core assembly 500 will not be described in detail herein.

In some embodiments, the attachment tab 530 of the second roll core assembly 500 and the attachment tab 430 of the first roll core assembly 400 are attached to different areas on the pole of the cover plate 300, respectively. In this way, the connecting

sheets

430 and 530 do not need to be overlapped for welding, and the welding difficulty is reduced.

The application also provides a battery preparation method. As an example, fig. 10 shows a flow chart of a battery preparation method 100 provided according to an embodiment of the present application.

S110, a first lamination core 410 and a second lamination core 420 are provided.

Referring to fig. 5A and 5B, the first laminated core 410 may include a first core body 411 and a first core tab 412 connected with the first core body 411. The second laminated core 420 can include a second core body 421 and a second core tab 422 coupled to the second core body 421. The structure of the first lamination core 410 and the second lamination core 420 can refer to the foregoing description and will not be described here.

S130, providing a connecting sheet 430.

The connection piece 430 may include a first connection portion 431, a second connection portion 432, and a third connection portion 433, wherein the first connection portion 431, the second connection portion 432, and the third connection portion 433 are connected in sequence.

The connection tabs 430 may include a positive connection tab 20 and a negative connection tab 10, as previously described. A positive connection piece 20 and a negative connection piece 20 form a connection piece group. One positive connecting sheet 20 and one negative connecting sheet 10 in one connecting sheet group are arranged according to a preset rule. For example, referring to fig. 6A and 6B, the negative electrode connecting piece 10 and the positive electrode connecting piece 20 are symmetrically arranged.

S150, the first connection portion 431 and the second connection portion 432 are bent along the connection portion M.

For example, the negative electrode connecting piece 10 shown in fig. 6A in an expanded shape is folded along the first folding portion M-1. The expanded positive electrode connecting piece 20 shown in fig. 6B is bent along the first bent portion M-2. The relative positions of the negative connecting piece 10 and the positive connecting piece 20 are not changed, and the bent negative connecting piece 10 and the bent positive connecting piece 20 are respectively shown in the axonometric diagrams of fig. 9A and 9B.

S170, connecting the first and

second core tabs

411 and 421 to the second and

third connection parts

432 and 433, respectively.

By way of example, fig. 11A and 11B illustrate a right side view and a front view, respectively, of the placement of a first lamination core 410, a second lamination core 420, and a connecting tab 430 provided in accordance with an embodiment of the present application. Referring to fig. 11A and 11B, the first lamination core 410, the second lamination core 420, and the connecting tab 430 are positioned as shown. Wherein the first lamination core 410 and the second lamination core 420 are symmetrically arranged. The core negative tab 412-1 of the first laminated core 410 corresponds to the core negative tab 422-1 of the second laminated core 420. The core tab 412-2 of the first laminated core 410 corresponds to the core tab 422-2 of the second laminated core 420.

The winding core negative electrode tab 412-1 is connected to the second connection portion 12 of the negative electrode connection tab 10. The negative electrode 422-1 of the winding core is connected to the third connecting portion 13 of the negative electrode connecting sheet 10. By way of example, the core negative tab 412-1 and the core negative tab 422-1 may be welded to the negative connection tab 10 using laser welding.

The winding core positive tab 412-2 is connected to the second connection portion 22 of the positive connection piece 20. The winding core positive electrode 422-2 is connected to the third connection portion 23 of the positive electrode connection piece 20. By way of example, laser welding may be used to weld the core tab 412-2 and core tab 422-2 to the positive tab 20.

To sum up: the winding core negative tab 412-1 of the first laminated winding core 410 and the winding core negative tab 422-1 of the second laminated winding core 420 are connected together by the second connecting part 12 and the third connecting part 13 of the negative electrode connecting sheet 10; the winding core positive lug 412-2 of the first laminated winding core 410 and the winding core positive lug 422-2 of the second laminated winding core 420 are connected together by using the second connecting part 22 and the third connecting part 23 of the positive connecting sheet 20; the second connecting portion and the third connecting portion on each connecting piece belong to different parts respectively, and like this, the core utmost point ear that rolls up of first lamination core and the core utmost point ear that rolls up of second lamination core need not superpose and weld, have reduced the welded degree of difficulty, have solved the technical problem that this application needs to solve.

S190, the second connecting portion 432 and the third connecting portion 433 are folded in half along the connecting portion N thereof, so that the first winding core tab 412 and the second winding core tab 422 are attached to each other, thereby generating the first winding core assembly 400.

The first laminated core 410 and the second laminated core 420 are respectively merged (cored) in the direction P, Q shown in fig. 11A to fit the side surfaces 601 and 602 of the first laminated core 410 and the second laminated core 420.

As an example, fig. 12A and 12B show a right side view and a front view after attaching the side 601 and the side 602, respectively. Fig. 12C shows an isometric view after side 601 and side 602 have been attached. Referring to fig. 12A, 12B and 12C, the first and second core tabs are attached and positioned in a space between the second and third connection portions of the connection sheet.

And (3) taking the connecting sheet and the roll core lug in the figure 12C as a whole, and bending the roll core lug to ensure that the third connecting part of the connecting sheet is attached to the surface of the roll core body, which is provided with the roll core lug. Fig. 12D shows a schematic view of the first core assembly after bending the core tab.

S210, a second core assembly 500 is generated.

The structure of the second core assembly 500 is symmetrical to the structure of the first core assembly 400. Similarly, the second core assembly 500 can be manufactured according to the steps shown in the previous flow. For brevity, the process of making the second core assembly 500 is not described in detail herein.

S230, providing the cover plate 300.

Fig. 13A shows a schematic structural diagram of a cover plate 300 according to an embodiment of the present application. The placement position of the cover 300 can be referred to fig. 13A.

The first core assembly 400 and the second core assembly 500 in the state shown in fig. 12D are placed on the cover sheet 300.

As an example, fig. 13B and 13C show front and bottom views, respectively, of the placement of a cover sheet 300, a first core assembly 400, and a second core assembly 500 provided according to embodiments of the present application.

Referring to fig. 13B and 13C, the first core assembly 400 and the second core assembly 500 are positioned as shown. Wherein, the first core assembly 400 and the second core assembly 500 are symmetrically arranged. The first connecting portion 11 of the negative connecting piece 10 in the first winding core assembly 400 corresponds to the first connecting portion 21 of the negative connecting piece 10 in the second winding core assembly 500, and the first connecting portion 21 of the positive connecting piece 20 in the first winding core assembly 400 corresponds to the first connecting portion 21 of the positive connecting piece 20 in the second winding core assembly 500.

And S250, connecting the cover plate 300 with a first connecting part of a connecting sheet of the first reel assembly.

S270, the cover plate 300 is connected with the first connecting portion of the connecting piece of the second roll core assembly.

The first connection portion 11 of the negative electrode connection piece of the first winding core assembly 400 and the first connection portion 11 of the negative electrode connection piece of the second winding core assembly 500 are connected to the negative electrode post of the cover plate 300, respectively. As an example, the manner of the connection may be laser welding. Fig. 13B shows a welding area a of the first connection portion 11 of the negative electrode connection piece of the first core assembly 400 and the negative electrode pillar and a welding area B of the first connection portion 11 of the negative electrode connection piece of the second core assembly 500 and the negative electrode pillar.

The welding area a and the welding area B may be separate areas, and the welding area a and the welding area B do not overlap. That is: the connection position of the negative electrode connecting piece 10 of the first roll core assembly 400 and the cover plate 300 is different from the connection position of the negative electrode connecting piece 10 of the second roll core assembly 500 and the cover plate 300.

Similarly, the first connection portion 21 of the positive electrode connecting piece of the first winding core assembly 400 and the first connection portion 21 of the positive electrode connecting piece of the second winding core assembly 500 are connected to the positive electrode post of the cover plate 300, respectively. As an example, the manner of the connection may be laser welding. Fig. 13B shows a welding area C of the first connection portion 21 of the positive electrode tab of the first winding core assembly 400 and the positive electrode post, and a welding area D of the first connection portion 21 of the positive electrode tab of the second winding core assembly 500 and the positive electrode post.

The welding area C and the welding area D may be separate areas, and the welding area C and the welding area D do not overlap. That is: the connection position of the positive electrode connecting piece 20 of the first roll core assembly 400 and the cover plate 300 is different from the connection position of the positive electrode connecting piece 20 of the second roll core assembly 500 and the cover plate 300.

In this way, the first connection portion of the two sets of connection pieces are used to connect the first winding core assembly 400 and the second winding core assembly 500 to the pole of the cover plate respectively. The first connecting portion of two sets of connection pieces are different from the connecting position of apron, have avoided overlapping between the connection piece to get up and weld, have reduced the welded degree of difficulty.

Referring to fig. 13C, after welding, the first core assembly 400 and the second core assembly 500 may be bent along the first bending portion M of the connecting sheet. For example, the first core assembly 400 and the second core assembly 500 are combined (core-combined) in the direction E, F shown in fig. 13C to attach the side 701 of the first core assembly 400 and the side 702 of the second core assembly 500.

Figure 14 shows an isometric view of a first core assembly 400 after attaching side 701 to side 702 of a second core assembly 500, according to an embodiment of the present application.

S290, providing the housing 200.

The housing 200 includes a first receiving chamber 210. The structure and function of the housing 200 can refer to the foregoing description, and are not described in detail herein.

S310, the first reel assembly 400 is placed in the first accommodating cavity 210.

The first core assembly 400 and the second core assembly 500 of the assembly shown in figure 14 are fitted into the first receiving cavity 210 of the shell 200. Wherein, the side connected with the cover plate 300 faces the first opening of the first accommodating cavity 210.

S330, the cap plate 300 is assembled to the case 200.

The cap plate 300 and the case 200 may be assembled and sealed. After sealing, electrolyte can be injected into the first receiving chamber 210 through the injection hole 310 of the cover plate 300.

Thus, the battery 100 is prepared.

In summary, the battery and the method for manufacturing the battery provided by the present application:

In conclusion, upon reading the present detailed disclosure, those skilled in the art will appreciate that the foregoing detailed disclosure can be presented by way of example only, and not limitation. Those skilled in the art will appreciate that the present application is intended to cover various reasonable variations, adaptations, and modifications of the embodiments described herein, although not explicitly described herein. Such alterations, improvements, and modifications are intended to be suggested by this application and are within the spirit and scope of the exemplary embodiments of the application.

Furthermore, certain terminology has been used in this application to describe embodiments of the application. For example, "one embodiment," "an embodiment," and/or "some embodiments" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. Therefore, it is emphasized and should be appreciated that two or more references to "an embodiment" or "one embodiment" or "an alternative embodiment" in various portions of this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined as suitable in one or more embodiments of the application.

It should be appreciated that in the foregoing description of embodiments of the present application, various features are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure aiding in the understanding of such feature. Alternatively, various features may be dispersed throughout several embodiments of the application. This is not to be taken as an admission that any of the features of the claims are essential, and it is fully possible for a person skilled in the art to extract some of them as separate embodiments when reading the present application. That is, embodiments in the present application may also be understood as an integration of multiple sub-embodiments. And each sub-embodiment described herein is equally applicable to less than all features of a single foregoing disclosed embodiment.

In some embodiments, numbers expressing quantities or properties used to describe and claim certain embodiments of the application are to be understood as being modified in certain instances by the term "about", "approximately" or "substantially". For example, "about," "approximately," or "substantially" can mean a ± 20% variation of the value it describes, unless otherwise specified. Accordingly, in some embodiments, the numerical parameters set forth in the written description and attached claims are approximations that may vary depending upon the desired properties sought to be obtained by a particular embodiment. In some embodiments, numerical parameters should be construed in light of the number of reported significant digits and by applying ordinary rounding techniques. Notwithstanding that the numerical ranges and parameters setting forth the broad scope of the embodiments of the application are approximations, the numerical values set forth in the specific examples are reported as precisely as possible.

Each patent, patent application, publication of a patent application, and other material, such as articles, books, descriptions, publications, documents, articles, and the like, cited herein is hereby incorporated by reference. All matters hithertofore set forth herein except as related to any prosecution history, may be inconsistent or conflicting with this document or any prosecution history which may have a limiting effect on the broadest scope of the claims. Now or later associated with this document. For example, if there is any inconsistency or conflict in the description, definition, and/or use of terms associated with any of the included materials with respect to the terms, descriptions, definitions, and/or uses associated with this document, the terms in this document are used.

Finally, it should be understood that the embodiments of the application disclosed herein are illustrative of the principles of the embodiments of the present application. Other modified embodiments are also within the scope of the present application. Accordingly, the disclosed embodiments are presented by way of example only, and not limitation. Those skilled in the art may implement the present application in alternative configurations according to the embodiments of the present application. Thus, embodiments of the present application are not limited to those embodiments described with precision in the application.

Claims

1. A battery, comprising:

a housing including a first receiving chamber, the first receiving chamber including a first opening;

a cover plate closing the first opening; and

the first reel subassembly, in first holding intracavity includes:

a first laminated winding core comprising a first winding core main body and a first winding core tab connected with the first winding core main body,

the second laminated roll core comprises a second roll core main body and a second roll core lug connected with the second roll core main body, and

the connection piece, one end with first book core utmost point ear with second book core utmost point ear is connected, and the other end with the apron is connected, wherein, first book core utmost point ear with second book core utmost point ear is connected to respectively the different positions of connection piece.

2. The battery of claim 1, wherein the first jellyroll tab and the second jellyroll tab are each in sheet form; and

the first winding core lug and the second winding core lug are at least partially attached.

3. The battery of claim 2, wherein the tab comprises a first connection portion, a second connection portion, and a third connection portion, the first connection portion, the second connection portion, and the third connection portion being connected in sequence, wherein:

the first connecting part is connected with the cover plate;

the second connecting part is connected with the first winding core tab; and

the third connecting portion is connected with the second winding core lug.

4. The battery of claim 3, wherein the second connection portion includes a second surface; the third connecting portion includes a third surface facing the second surface and spaced apart from the second surface; and

the first and second core tabs are located between the second and third surfaces,

the first cored tab is attached to the second surface, an

The second roll core tab is attached to the third surface.

5. The battery of claim 4, wherein the tab is folded in a zigzag pattern.

6. The battery according to claim 4, wherein the first connection portion, the second connection portion, and the third connection portion may be flattened to the same plane.

7. The battery according to claim 6, wherein the connecting tab is L-shaped when the first connecting portion, the second connecting portion, and the third connecting portion are flattened to the same plane.

8. The battery of claim 1, wherein the connecting tab is joined to the cover plate by laser welding and the connecting tab is joined to the first jellyroll tab and the second jellyroll tab by ultrasonic welding.

9. The battery of claim 1, wherein the first core tab comprises a first core tab and a first core tab, the second core tab comprises a second core tab and a second core tab, the tabs comprise a positive tab and a negative tab;

the first winding core positive lug and the second winding core positive lug are respectively connected to different parts of the positive connecting sheet; and

the first winding core negative electrode lug and the second winding core negative electrode lug are respectively connected to different positions of the negative electrode connecting sheet.

10. The battery of claim 9, wherein at least one of the positive and negative connection tabs is provided with an overflow aperture.

11. The battery of claim 9, wherein the positive electrode tab is a single layer of aluminum or aluminum alloy sheet, or a composite structure comprising more than one layer of aluminum or aluminum alloy sheet.

12. The battery of claim 9, wherein the negative electrode connecting tab is a single layer of copper or copper alloy tab, or a composite structure comprising more than one layer of copper or copper alloy tabs.

13. The battery of claim 1, further comprising a second jellyroll assembly having a structure that is symmetrical to the structure of the first jellyroll assembly.

14. The battery of claim 13, wherein the connecting tab of the second roll core assembly and the connecting tab of the first roll core assembly are connected to different areas of the cover sheet, respectively.