CN218299884U

CN218299884U - Battery cell

Info

Publication number: CN218299884U
Application number: CN202221942937.7U
Authority: CN
Inventors: 黄红光; 李树辉
Original assignee: GAC Aion New Energy Automobile Co Ltd
Current assignee: GAC Aion New Energy Automobile Co Ltd
Priority date: 2022-07-25
Filing date: 2022-07-25
Publication date: 2023-01-13
Anticipated expiration: 2032-07-25

Abstract

The application relates to a battery cell, the battery cell includes: an inner shell; the electrode roll is provided with a first perforation, the inner shell penetrates through the first perforation to enable the electrode roll to be sleeved outside the inner shell, and the positive end and the negative end of the electrode roll are both provided with tabs; the end cover assemblies are respectively arranged at two ends of the pole roll and used for connecting the pole lugs; and the shell is sleeved outside the pole coil and is connected with the end cover assembly. The positive pole and the negative pole of electric core of this application set up respectively at the both ends of electric core, and it is uncharged between electric core shell and the inner shell, have improved the security performance. The electric core is hexagonal column structure to the inner shell also is hexagonal structure, and its structure is different from current circular electric core, square electric core, possesses small, simple and easy characteristics. This electricity core has guaranteed the insulating shoes between electric core positive pole or negative pole and the inner shell through set up insulating sealed pad and insulating rubber pad in the end cover assembly. The battery core can be widely applied to the technical field of new energy automobiles, power batteries and energy storage batteries.

Description

Battery cell

Technical Field

The application relates to the technical field of battery cells, in particular to a battery cell.

Background

The battery cell is mainly applied to the fields of new energy automobiles, power batteries and energy storage batteries. The existing battery cell forms mainly comprise a square-shell battery cell, a soft-package battery cell, an octagonal battery cell and the like.

Under the condition that a cell chemical system is not broken through, the cell structure is innovated, and the structural innovation of the whole battery pack is further promoted, so that the improvement of the energy density, the safety, the quick charging performance and the like of the power lithium battery is helpful. With the continuous development of the technology, the structural requirements for the battery cell are higher and higher, and the battery cell has a small volume and long storage time and is currently the mainstream pursuit of the battery cell industry. However, the existing battery cell still has the problems of large volume, complex manufacturing method and the like.

SUMMERY OF THE UTILITY MODEL

The purpose of this application is to provide an electric core, this electric core structure is small, and the performance improves, and manufacturing process is simple and easy.

The embodiment of the application is realized as follows:

in a first aspect, the present application provides a battery cell, including:

an inner shell;

the electrode roll is provided with a first perforation, the inner shell penetrates through the first perforation to enable the electrode roll to be sleeved outside the inner shell, and the positive end and the negative end of the electrode roll are both provided with tabs;

the end cover assemblies are respectively arranged at two ends of the pole roll and are used for connecting the pole lugs; and the shell is sleeved outside the pole coil and is connected with the end cover assembly.

In one embodiment, the end cap assembly includes:

the conductive piece is provided with an introduction groove for the pole lug to pass through and a second through hole for the inner shell to pass through;

the end cover is arranged at the outer end of the conductive piece, and is provided with an end cover guide groove for the leading-in groove to pass through and a third through hole for the inner shell to pass through; and

and the pole column is arranged at the outer end of the end cover, and a pole column guide groove for the leading-in groove to penetrate through is arranged on the pole column.

In one embodiment, the end cap assembly further comprises:

the insulating sealing gasket is arranged between the conductive piece and the end cover, a sealing gasket guide piece for the leading-in groove to pass through is arranged on the insulating sealing gasket, the sealing gasket guide piece extends outwards to form a sealing element leading-in column, and the sealing element leading-in column can pass through the end cover guide groove;

and a fourth through hole for the inner shell to be perforated is further formed in the insulating sealing gasket.

In one embodiment, the end cap assembly further comprises:

and the insulating rubber gasket is arranged between the end cover and the pole, and is provided with a rubber gasket guide groove for the leading-in column of the sealing element to pass through.

In one embodiment, the pole is provided with a pole perforation, the insulating rubber pad is provided with an insulating rubber hole, the insulating rubber hole extends outwards to form a circle of boss, and the boss is used for being connected with the pole perforation in a matching mode.

In one embodiment, the end cap profile is correspondingly the same as the pole roll profile.

In one embodiment, the insulating gasket has a shape corresponding to the shape of the pole roll.

In one embodiment, the outer shape of the housing corresponds to the outer shape of the pole roll.

In one embodiment, the inner shell has a shape corresponding to the shape of the pole roll.

In one embodiment, the first through hole has a shape corresponding to the shape of the inner housing.

Compared with the prior art, the beneficial effect of this application is: the positive pole and the negative pole of electric core of this application set up respectively at the both ends of electric core, and it is uncharged between electric core shell and the inner shell, have improved the security performance. Secondly, the electric core of making is hexagon cylindricality structure to the inner shell also is hexagon structure, and its structure is different from current circular electric core, square electric core, possesses small, simple and easy characteristics. This electricity core has guaranteed the insulating shoes between electric core positive pole or negative pole and the inner shell through set up insulating sealed pad and insulating rubber pad in the end cover assembly. The battery core can be widely applied to the technical field of new energy automobiles, power batteries and energy storage batteries.

Additional features and advantages of the present application will be described in detail in the detailed description which follows.

Drawings

To more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.

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

fig. 2 is a schematic structural diagram of a cell inner casing according to an embodiment of the present disclosure;

FIG. 3 is a schematic view of a pole roll wound around an inner housing according to an embodiment of the present application;

FIG. 4 is a schematic view of a pole roll rolled into a housing according to an embodiment of the present disclosure;

fig. 5 is a schematic diagram of a cell explosion according to an embodiment of the present application;

FIG. 6 is an enlarged view of FIG. 5 of the present application at A;

FIG. 7 is a schematic structural view of an end cap assembly according to an embodiment of the present application;

fig. 8 is a schematic view of the connection between the end cap assembly and the tab according to an embodiment of the present application;

fig. 9 is a cross-sectional view of a connection between an end cap assembly and a tab according to an embodiment of the present application;

fig. 10 is a left side view of a battery cell provided in an embodiment of the present application;

fig. 11 isbase:Sub>A sectional view taken along linebase:Sub>A-base:Sub>A in fig. 10.

An icon:

1-electric core; 100-an inner shell; 200-pole coil; 210-a first perforation; 220-pole ear; 300-an end cap assembly; 310-a conductive member; 311-an introduction groove; 312-a second perforation; 320-an insulating gasket; 321-a gasket guide; 3221-a gasket lead-in post; 322-fourth perforation; 330-end cap; 331-end cap guide slot; 332-third perforation; 340-insulating rubber pad; 341-rubber pad guide groove; 342-insulating rubber hole; 343-a boss; 350-pole; 351-pole guide groove; 352-pole punching; 400-shell.

Detailed Description

The terms "first," "second," "third," and the like are used for descriptive purposes only and are not intended to denote a sequential order, nor are they intended to indicate or imply relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "upper", "lower", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when products of the application are used, and are used only for convenience in describing the application and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application.

In the description of the present application, unless expressly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.

Referring to fig. 1, an electrical core 1 includes: inner shell 100, pole roll 200, end cap assembly 300, outer shell 400. The electrode roll 200 is provided with a first perforation 210, the inner shell 100 penetrates through the first perforation 210 to enable the electrode roll 200 to be sleeved outside the inner shell 100, the positive end and the negative end of the electrode roll 200 are both provided with tabs 220, the positive end and the negative end of the electrode roll 200 are both provided with end cover assemblies 300, the end cover assemblies 300 are used for connecting the tabs 220, and the outer shell 400 is sleeved outside the electrode roll 200 and connected with the end cover assemblies 300.

Referring to fig. 2 and 3, the shape of the inner cell casing 100 is the same as the shape of the pole roll 200. The first through hole 210 has the same shape as the battery cell inner casing 100. The outer shape of the cell inner casing 100 may be one of circular, rectangular, and polygonal. In this embodiment, the outer shape of the inner battery cell casing 100 is a regular hexagon, and correspondingly, the outer shape of the pole roll 200 is also a regular hexagon, and the outer shape of the first through hole 210 on the pole roll 200 is also a regular hexagon. The inner shell 100 extends through the first aperture 210 at both ends, and extends beyond the pole wrap 200 a distance that is reserved for connection to the end cap assembly 300. The tabs 220 are provided as a pair and symmetrically disposed at both sides of the first through-hole 210 in the pole roll 200. The tab 220 may be deformed by bending to form an arc structure.

In an embodiment, an explosion-proof valve may be disposed in the inner casing 100, and when thermal runaway occurs in the battery cell 1, the thermal runaway is sprayed to the internal channel of the battery cell 1. The explosion-proof valve has the explosion isolating function of bearing the gas explosion pressure, has the function of retarding the gas explosion energy transfer, and improves the safety performance of the battery cell 1.

Referring to fig. 4, the outer casing 400 is sleeved outside the inner casing 100, and the outer casing 400 has the same shape as the pole roll 200. The outer shape of the housing 400 may be one of circular, rectangular, and polygonal. In this embodiment, the outer shape of the housing 400 is a regular hexagon.

Referring to fig. 5 and 6, the end cap assembly 300 includes: the terminal comprises a conductive member 310, an insulating gasket 320, an end cover 330, an insulating rubber gasket 340 and a pole 350. The conductive element 310 is provided with a second through hole 312 for the inner shell 100 to pass through, two sides of the second through hole 312 are symmetrically provided with lead-in grooves 311 for the two tabs 220 to pass through, and the lead-in grooves 311 and the conductive element 310 can be integrally formed by punching. The shape of the second perforation 312 may be identical to or different from the shape of the inner case 100. In this embodiment, the conductive member 310 may be aluminum.

The end cap 330 is disposed at the outer end of the conductive member 310, and the end cap 330 is provided with an end cap guide slot 331 for the introduction slot 311 to pass through, and a third through hole 332 for the inner shell 100 to pass through. The third through holes 332 have a regular hexagonal shape in conformity with the shape of the inner case 100. The cap guide grooves 331 are symmetrically provided at both sides of the third through hole 332.

In one embodiment, the end cap 330 has a regular hexagonal shape corresponding to the shape of the pole roll 200. The material of the end cap 330 is selected to be aluminum because the aluminum end cap has excellent conductivity.

The insulating gasket 320 is disposed between the conductive member 310 and the end cap 330. The insulating gasket 320 serves to insulate, withstand voltage, and seal. The insulating gasket 320 is provided with a gasket guide 321 through which the introduction groove 311 passes, the gasket guide 321 extends outward to form a gasket introduction column 3221, and the gasket introduction column 3221 can pass through the end cover guide groove 331. The insulating gasket 320 is further provided with a fourth penetration hole 322 for penetrating the inner case 100. The packing introduction posts 3221 are symmetrically disposed at both sides of the fourth through hole 322. The gasket introduction column 3221 may be press-molded integrally with the insulating gasket 320 at the time of processing. The gasket lead-in post 3221 may insulate the conductive member 310 from the end cap 330.

In one embodiment, the insulating gasket 320 has a regular hexagonal shape corresponding to the shape of the electrode coil 200.

The pole 350 is disposed at the outer end of the end cap 330, and a pole guide groove 351 for the introduction groove 311 to pass through is disposed on the pole 350. The pole 350 is provided with a pole through hole 352, and the pole guide grooves 351 are symmetrically arranged at two sides of the pole through hole 352. In this embodiment, the terminal 350 may have a circular ring structure.

The insulating rubber pad 340 is disposed between the end cap 330 and the terminal 350 for insulation and voltage resistance. The insulating rubber pad 340 is provided with a rubber pad guide groove 341 through which the gasket guide post 3221 passes. The insulating rubber pad 340 is provided with an insulating rubber hole 342, and the insulating rubber hole 342 extends outward to form a circle of boss 343. The rubber pad guide grooves 341 are symmetrically disposed at both sides of the insulating rubber hole 342. The boss 343 is used for fitting connection with the pole penetration hole 352. In this embodiment, the insulating rubber pad 340 is a circular ring structure, and the diameter of the outer ring of the terminal 350 is smaller than the diameter of the outer ring of the insulating rubber pad 340.

In one embodiment, the boss 343 and the post through hole 352 may be connected by a snap fit. When the pole 350 passes through the insulating rubber pad 340, the boss 343 is in snap-fit connection with the pole through hole 352, and the pole guide groove 351 passes through the rubber pad guide groove 341, so that the pole 350 is positioned in the insulating rubber pad 340, and thus the creepage distance and the electrical clearance can be increased, and the electrical safety is improved.

In the present application, the outer shape of the introduction groove 311, the outer shape of the gasket guide 321, the outer shape of the end cap guide groove 331, the outer shape of the rubber gasket guide groove 341, and the outer shape of the pole guide groove 351 all match the outer shape of the tab 220, and are all arc-shaped structures. The installation positions of the introduction groove 311, the gasket guide 321, the end cap guide groove 331, the rubber gasket guide groove 341, and the pole guide groove 351 all correspond to the position of the tab 220.

In addition, the end cap assemblies 300 in the present application are provided as a pair, and are respectively disposed at two ends of the pole roll 200, and correspond to the positive and negative ends of the pole roll 200. For example, if the end cap assembly 300 is located at the positive end of the coil 200, the tab 220 at the positive end of the coil 200 is a positive tab, the tab 350 corresponding to the end cap assembly 300 is a positive terminal, the tab 220 at the negative end of the coil 200 is a negative tab, and the tab corresponding to the end cap assembly 300 is a negative terminal.

Referring to fig. 1 to fig. 11, a method for manufacturing a battery cell is used to manufacture the battery cell 1, and specifically includes steps S210 to S250:

step S210: the end cap assembly 300 is manufactured.

Referring to fig. 5-11, in this step, it is first required to manufacture the end cap assembly 300, where the end cap assembly 300 includes: the conductive member 310, the insulating gasket 320, the end cap 330, the insulating rubber gasket 340 and the pole 350. The structures of the conductive element 310, the insulating gasket 320, the end cap 330, the insulating rubber gasket 340 and the pole 350 can be processed or punched according to actual production requirements. And after each part is processed, the parts are mutually connected and fixed.

Inserting the positive tab 220 on the positive end of the pole roll 200 into the lead-in slot 311 of the conductive member 310, simultaneously inserting the inner casing 100 through the second through hole 312 of the conductive member 310, connecting the insulating gasket 320 to the conductive member 310, namely, passing the lead-in slot 311 together with the positive tab 220 through the gasket lead-in post 3221 on the insulating gasket 320, connecting the end cap 330 to the insulating gasket 320, namely, passing the gasket lead-in post 3221 together with the lead-in slot 311 and the positive tab 220 through the end cap guide slot 331, connecting the insulating rubber gasket 340 to the end cap 330, passing the gasket lead-in post 3221 together with the lead-in slot 311 and the positive tab 220 through the end cap guide slot 341, and finally passing the pole guide slot 351 on the positive pole 350 through the rubber gasket 341 to position the pole 350 in the insulating rubber gasket 340. During the connection of the structures, the inner casing 100 passes through the second through hole 312 of the conductive member 310, the fourth through hole 322 of the insulating gasket 320, and the third through hole 332 of the end cap 330 in sequence. The conductive member 310, the insulating gasket 320, the end cap 330, the insulating rubber gasket 340 and the post 350 are connected in sequence, and finally connected into a whole, as shown in fig. 7 (a front view effect) and (b back view effect).

The same method is used to complete the manufacture of the end cap assembly 300 outside the negative end of the coil 200.

Referring to fig. 9, after the end cap assembly 300 is manufactured, the lead-in groove 311 of the conductive component 310 is welded to the surface of the positive electrode post 350, and after welding, the lead-in groove 311 is flush with the surface of the positive electrode post 350. In the same way, the leading-in groove 311 of the conductive component 310 in the end cover assembly 300 outside the negative end of the pole roll 200 is welded with the surface of the negative pole 350, so that the welded leading-in groove 311 is flush with the surface of the negative pole 350.

The conductive component 310 is pressed to make the surface of the lead-in groove 311 on the conductive component 310 flush with the surfaces of the positive and negative poles 350, so that the insulating sealing gasket 320 deforms under the pressing of the conductive component 310 and abuts against the surfaces of the positive and negative poles 350 to achieve the sealing effect, as shown in fig. 9.

Step S220: the pole roll 200 is wound around the inner casing 100, such that the pole roll 200 is sleeved outside the inner casing 100.

Referring to fig. 3, in this step, a battery cell 1 needle winding machine may be used to wind the pole roll 200 around the battery cell inner casing 100, so that the inner casing 100 and the pole roll 200 are wound and then integrated.

Step S230: the wound inner case 100 and pole roll 200 are integrally fitted into an outer case 400 and subjected to an insulation process.

Referring to fig. 4, in this step, after the winding is completed, the pole roll 200 is integrally installed in the cell outer casing 400 together with the inner casing 100. The surfaces of the cell inner casing 100 and the cell outer casing 400 are subjected to insulation treatment. An insulating layer is attached to the outer surface of the inner cell casing 100 and the inner surface of the outer cell casing 400, and only the tab 220 is exposed from the inner casing 100 to which the insulating layer is attached. Specifically, the insulating layer may be an insulating tape, for example, a black tape or a plastic tape may be wound on the surface of the inner casing 100, and the black tape is attached to the surface of the pole roll 200 for insulation, so as to insulate the pole roll 200 from the inner casing 100 and the outer casing 400, thereby preventing the electric core 1 from leaking electricity or generating short circuit, so as to ensure the safety of the electric core 1, and the insulating layer may tightly wrap the inner casing 100 and the outer casing 400.

In one embodiment, a refractory layer may be wound on the surface of the housing 400, and the refractory layer may be a non-insulating material, such as one of copper, aluminum oxide, and magnesium oxide. The insulation of the battery cell 1 can be further protected by performing an insulation treatment on the case 400 wound with the high temperature resistant material, for example, attaching a layer of insulating tape on the outside of the high temperature resistant material.

Step S240: the tabs 220 at the two ends of the electrode roll 200 are respectively connected with the corresponding end cover assembly 300.

Referring to fig. 8 and 9, after the insulation treatment is completed, an insulation test is performed on the battery cell 1, and after the test is passed, the processes of welding the tab 220 and the end cap assembly 300 and the like may be performed. The tabs 220 at the positive and negative ends of the electrode roll 200 are respectively connected to the corresponding end cover assembly 300. In one embodiment, ultrasonic welding may be performed at the junction of the tab 220 and the lead-in slot 311, so that the tab 220 is fixedly and electrically connected to the conductive member 310.

Step S250: the end cap assembly 300 is integrally connected to the housing 400.

In this step, referring to fig. 5 and fig. 11, the battery cell outer shell 400 is aligned with the end cap 330 on the end cap assembly 300, and is welded and fixed by a welding gun, so that the inside of the battery cell inner shell 100 is in a sealed state, thereby ensuring air tightness, preventing impurities or metal debris generated by welding from entering the inside of the outer shell 400, and improving the safety performance of the battery cell 1. And finally, the whole battery core 1 is manufactured.

The positive electrode and the negative electrode of the battery cell 1 manufactured by the method are respectively arranged at two ends of the battery cell 1, and the outer shell 400 and the inner shell 100 of the battery cell 1 are not electrified, so that the safety performance is improved. Secondly, the manufactured battery cell 1 is of a hexagonal cylindrical structure, and the inner shell 100 is also of a hexagonal structure, which is different from the existing round battery cell 1 and square battery cell 1 in structure, and has the characteristics of small volume and simplicity. This electricity core 1 has guaranteed the insulating shoes between electric core 1 positive pole or negative pole and inner shell 100 through set up insulating sealing pad 320 and insulating rubber pad 340 in end cover assembly 300. The battery cell 1 manufactured by the method can be widely applied to the technical fields of new energy automobiles, power batteries, energy storage batteries and the like.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An electrical core, comprising:

an inner shell;

the end cover assemblies are respectively arranged at two ends of the pole roll and used for connecting the pole lugs; and

and the shell is sleeved outside the pole coil and is connected with the end cover assembly.

2. The cell of claim 1, wherein the end cap assembly comprises:

and the pole column is arranged at the outer end of the end cover, and a pole column guide groove for the leading-in groove to penetrate is arranged on the pole column.

3. The electrical core of claim 2, wherein the end cap assembly further comprises:

the insulating sealing gasket is arranged between the conductive piece and the end cover, a sealing gasket guide piece for the leading-in groove to penetrate through is arranged on the insulating sealing gasket, the sealing gasket guide piece extends outwards to form a sealing element leading-in column, and the sealing element leading-in column can penetrate through the end cover guide groove;

4. The cell of claim 3, wherein the end cap assembly further comprises:

5. The electric core of claim 4, wherein the pole is provided with a pole perforation, the insulating rubber pad is provided with an insulating rubber hole, the insulating rubber hole extends outwards to form a circle of boss, and the boss is used for being connected with the pole perforation in a matching manner.

6. The cell of claim 2, wherein the end cap profile corresponds to the pole wrap profile.

7. The electrical core of claim 3, wherein the insulating gasket has a shape corresponding to the pole wrap shape.

8. The electrical core of claim 1, wherein an outer shape of the housing is correspondingly the same as the pole wrap outer shape.

9. The cell of claim 1, wherein the inner shell shape corresponds to the pole wrap shape.

10. The electrical core of claim 1, wherein the first perforation profile is correspondingly identical to the inner shell profile.