CN219163644U

CN219163644U - Rechargeable battery

Info

Publication number: CN219163644U
Application number: CN202320265961.XU
Authority: CN
Inventors: 吴功清; 高程
Original assignee: Hefei Guoxuan High Tech Power Energy Co Ltd
Current assignee: Hefei Gotion High Tech Power Energy Co Ltd
Priority date: 2023-02-13
Filing date: 2023-02-13
Publication date: 2023-06-09
Anticipated expiration: 2033-02-13

Abstract

The utility model discloses a rechargeable battery, comprising: the battery cell is provided with a positive electrode tab and a negative electrode tab at two ends along the length direction of the battery respectively; positive and negative electrode posts disposed on one top surface formed in the length and width directions of the battery; the positive electrode post and the positive electrode lug are connected together through a positive electrode connecting sheet, and the negative electrode post and the negative electrode lug are connected together through a negative electrode connecting sheet; at least one of the positive electrode connecting sheet and the negative electrode connecting sheet is a split connecting sheet, the split connecting sheet comprises a first connecting sheet and a second connecting sheet which are connected with each other, the first connecting sheet is connected with the pole post, the second connecting sheet is connected with the pole lug, and the first connecting sheet and the second connecting sheet are connected through surface contact. According to the utility model, the first connecting piece and the second connecting piece are connected through surface contact, so that the connection area between the first connecting piece and the second connecting piece is enlarged, and the connection strength between the first connecting piece and the second connecting piece can be effectively improved.

Description

Rechargeable battery

Technical Field

The utility model relates to the technical field of power batteries, in particular to a rechargeable battery.

Background

The lithium battery has the advantages of high energy density, high power density, multiple recycling times and the like, is widely applied to equipment such as smart phones, electric bicycles, new energy automobiles and the like, and becomes a key for solving global problems such as energy crisis, environmental pollution and the like. With the increasing perfection of electric automobile technology, electric automobiles are more and more near to people's daily life, there is huge business opportunities, and electric automobiles put forward higher requirements on the performance of lithium ion batteries for providing energy for the electric automobiles. The rechargeable battery has the advantages of high energy density, long cycle life and the like, and is widely applied to the fields of new energy power products and the like. With the increasing demand of new energy automobiles year by year, the demand of the electric automobile market for rechargeable batteries is also increasing, and simultaneously, higher requirements are put forward for the energy density and other performances of the rechargeable batteries.

Through retrieving, chinese patent CN114497836a discloses a full tab top cap assembly and full tab battery, including the pond includes: the top cover piece, lower plastic, the roll-over valve, first connection piece and second connection piece. The first connecting piece and the second connecting piece are connected at the bottom of lower plastic, and the first connecting piece is including first assembly portion and the first pin that is the angle coupling, and the first assembly portion just is to the part indent of upset through-hole and form the third heavy groove, has seted up a plurality of air vents through the third heavy groove. In this scheme, be equipped with positions such as pin or supporting legs on first connection piece or the second connection piece, lead to the space increase that the connection piece occupy, be unfavorable for improving the energy density of battery, connect insecure between the connection piece moreover.

In other prior art, in order to facilitate welding, strengthen welding strength, can be equipped with the guide plate of being connected with the utmost point ear on the connection piece, wholly buckle after utmost point ear and guide plate welding. However, the fixing mode of the guide piece and the tab occupies a larger space inside the battery, so that the size of the pole core is reduced, and the energy density of the battery is also reduced.

Disclosure of Invention

1. Technical problem to be solved by the utility model

The utility model provides a rechargeable battery, which is connected with split connecting pieces through surface contact, so that the problem of unstable connection of the split connecting pieces is solved.

2. Technical proposal

In order to achieve the above purpose, the technical scheme provided by the utility model is as follows:

a rechargeable battery, comprising: the battery comprises a battery core, wherein both ends of the battery core along the length direction of the battery are respectively provided with a positive electrode tab and a negative electrode tab; positive and negative electrode posts disposed on one top surface formed in the length and width directions of the battery; the positive electrode post and the positive electrode lug are connected together through a positive electrode connecting sheet, and the negative electrode post and the negative electrode lug are connected together through a negative electrode connecting sheet; at least one of the positive electrode connecting sheet and the negative electrode connecting sheet is a split connecting sheet, the split connecting sheet comprises a first connecting sheet and a second connecting sheet which are connected with each other, the first connecting sheet is connected with the pole post, the second connecting sheet is connected with the pole lug, and the first connecting sheet and the second connecting sheet are connected through surface contact.

Further, the widths of the first connecting sheet and the second connecting sheet are consistent with the widths of the battery cells.

Further, the first connecting piece is of a flat plate type structure, and the second connecting piece is of an L-shaped structure.

Further, the first connecting piece comprises a first bending surface, the second connecting piece comprises a second bending surface, and the first bending surface and the second bending surface are connected together.

Further, after the first bending surface and the second bending surface are connected, bending is performed towards the direction close to the second connecting sheet, and bending is performed until the first bending surface and the second bending surface are close to the second connecting sheet.

Further, the first connecting piece is of an L-shaped structure, and the second connecting piece is of a flat plate structure.

Further, the second connecting piece is located between the first bending surface and the battery cell.

Further, the battery cell is arranged in an aluminum shell.

Further, insulating glue is coated on one surface of the positive electrode connecting sheet and the negative electrode connecting sheet, which is contacted with the aluminum shell.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the utility model has the following beneficial effects:

(1) According to the rechargeable battery, the split type connecting piece comprises the first connecting piece and the second connecting piece which are connected with each other, and the first connecting piece and the second connecting piece are connected through surface contact, so that the connecting area between the first connecting piece and the second connecting piece is enlarged, and the connecting strength between the first connecting piece and the second connecting piece can be effectively improved. And the connecting surface is bent, so that the occupied space is reduced.

(2) According to the rechargeable battery, the electrode lugs and the electrode posts are not positioned on the same side face of the battery, so that the occupied space of the battery in the height direction is reduced. The tab and the pole are connected together through the connecting sheet, the connecting sheet is of a plate structure, the structure is simple, the width of the connecting sheet is consistent with that of the battery cell, the space occupied by the connecting sheet due to the complex structure is reduced, the space occupied by the tab and the connecting sheet in the length direction of the battery can be effectively reduced, the size of the battery cell can be increased, and therefore the energy density of the battery cell can be effectively improved.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present utility model;

fig. 2 is a front view of a battery cell connection according to a first embodiment of the present utility model;

FIG. 3 is a left side view of a cell connection according to a first embodiment of the present utility model;

FIG. 4 is a schematic view of a split connecting piece according to an embodiment of the present utility model;

FIG. 5 is a schematic diagram illustrating the connection between the second connection piece and the tab according to the first embodiment of the present utility model;

fig. 6 is a schematic diagram of a split type connecting piece connection mode in a second embodiment of the present utility model.

Reference numerals in the schematic drawings illustrate: 1. a battery; 2. a positive electrode post; 3. a negative electrode post; 4. a battery cell; 5. a negative electrode tab; 6. a split connecting sheet; 601. a first connecting piece; 6010. a first bending surface; 602. a second connecting piece; 6020. a second bending surface; 7. and a positive electrode tab.

Detailed Description

For a further understanding of the present utility model, the present utility model will be described in detail with reference to the drawings and examples.

For convenience of description, the length direction, the width direction, and the height direction of the battery 1 are defined as shown in fig. 1.

Example 1

As shown in fig. 1, a rechargeable battery comprises a battery core 4, wherein the battery core 4 is arranged in an aluminum shell, and two ends of the battery core 4 along the length direction of the battery are respectively provided with a positive electrode tab 7 and a negative electrode tab 5; and the battery further comprises a positive electrode pole 2 and a negative electrode pole 3, wherein the positive electrode pole 2 and the negative electrode pole 3 are arranged on one top surface formed in the length direction and the width direction of the battery. The positive pole post 2 and the positive pole lug 7 are connected together through a positive pole connecting sheet, and the negative pole post 3 and the negative pole lug 5 are connected together through a negative pole connecting sheet. And at least one of the positive electrode connecting sheet and the negative electrode connecting sheet is a split connecting sheet 6, the split connecting sheet 6 comprises a first connecting sheet 601 and a second connecting sheet 602 which are connected with each other, wherein the first connecting sheet 601 is connected with a pole post, the second connecting sheet 602 is connected with a pole lug, the first connecting sheet 601 and the second connecting sheet 602 are connected through surface contact, the connecting area between the first connecting sheet 601 and the second connecting sheet 602 is enlarged, and the connecting strength between the first connecting sheet 601 and the second connecting sheet 602 is effectively improved. And the widths of the first connecting sheet 601 and the second connecting sheet 602 are consistent with the width of the battery cell 4, so that the occupied space of the connecting sheets can be reduced.

As shown in fig. 2-4, in the present embodiment, the first connecting piece 601 has a flat plate structure, and the second connecting piece 602 has an L-shaped structure. The first connecting piece 601 includes a first bending surface 6010, the second connecting piece 602 includes a second bending surface 6020, the first bending surface 6010 extends to the outer side of the battery 1 after the first connecting piece 601 is connected with the pole, and the second connecting piece 602 is connected with the pole lug to connect the first bending surface 6010 and the second bending surface 6020 together. The first bending surface 6010 and the second bending surface 6020 are connected and then bent in a direction toward the second connecting piece 602, and are bent to be close to the second connecting piece 602. In connection with the illustration in fig. 2, the bent first bending surface 6010 and the second bending surface 6020 do not occupy a lot of space in the length direction of the battery, which is advantageous for improving the energy density of the battery.

After the battery cell 4 is assembled, the battery cell 4 is arranged in an aluminum shell, a cover plate is arranged on one side face which is the same as the positive electrode post and the negative electrode post, and insulating glue is coated on one face, which is in contact with the aluminum shell, of the positive electrode connecting sheet and the negative electrode connecting sheet in the aluminum shell.

In the rechargeable battery of this embodiment, the tab of the battery core 4 is a plurality of layers, and when the tab is connected with the second connecting piece, the tab is welded in advance, and the tab is welded together. And secondly, welding the electrode lug and the second connecting sheet together through ultrasonic welding, laser welding or resistance welding, so as to strengthen the connection strength between the electrode lug and the second connecting sheet. In order to avoid damaging the tab during welding, a protection sheet is arranged between the second connecting sheet and the tab when the second connecting sheet is connected with the tab.

In the preparation of the rechargeable battery of this embodiment, the battery cell 4 is first prepared, and in this embodiment, a split type connecting piece 6 is used between the negative electrode tab and the negative electrode post. The connection between the positive electrode tab and the positive electrode post is not limited, and the positive electrode tab and the positive electrode post can be connected by adopting a split type connecting sheet or other connecting sheet structures.

After the preparation of the cell 4 is completed, the first connecting piece 601 is connected with the negative electrode post 3. The negative electrode tab is welded in advance to form a whole, the negative electrode tab 5 is connected with the second connecting sheet 602, as shown in fig. 5, and then the second connecting sheet 602 is turned by 90 ° so that the second connecting sheet 602 is attached to the battery cell 4. Finally, the first bending surface 6010 of the first connecting piece 601 and the second bending surface 6020 of the second connecting piece 602 are connected together, and the first bending surface 6010 and the second bending surface 6020 are bent in a direction approaching the second connecting piece 602 and are bent to approach the second connecting piece 602.

In this embodiment, the first connecting piece 601 and the second connecting piece 602 are connected through the first bending surface 6010 and the second bending surface 6020, so that the connection area between the two connecting pieces is increased, and the connection strength between the two connecting pieces can be enhanced. After connection, the first bending surface 6010 and the second bending surface 6020 are bent, so that the space occupied by the connecting sheet in the length direction of the battery is reduced, and the energy density of the battery is improved.

Example two

In this embodiment, the structure of the battery cell 4 is the same as that in the first embodiment. As shown in fig. 6, the split connecting piece 6 includes a first connecting piece 601 and a second connecting piece 602 connected to each other, wherein the first connecting piece 601 has an L-shaped structure, and the second connecting piece 602 has a flat plate-shaped structure. The first connecting piece 601 includes a first bending surface 6010, and the second connecting piece 602 includes a second bending surface 6020.

In this embodiment, the first connecting piece 601 and the second connecting piece 602 are connected by connecting the first bending surface 6010 and the second bending surface 6020 together. The second connecting piece 602 is located between the first bending surface 6010 and the battery cell 4, so that the second connecting piece 602 can be tightly combined with the battery cell 4, and the fixing effect on the battery cell 4 can be achieved. In addition, in the embodiment, the bending process can be reduced, and the assembly efficiency of the battery is improved.

In this embodiment, the use of the split type connection piece 6 between the negative electrode tab and the negative electrode post is also described. When the rechargeable battery is prepared, the first connecting piece 601 and the second connecting piece 602 are connected together through the first bending surface 6010 and the second bending surface 6020, and then the rechargeable battery is mounted on the battery cell 4, so that the first connecting piece 601 is connected with the negative electrode pole, and the second connecting piece 602 is connected with the negative electrode pole. In this embodiment, the pretreatment of the negative electrode tab is completed, no turnover surface is reserved, and the second connection piece 602 is directly attached to the negative electrode tab surface of the battery cell 4.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims

1. A rechargeable battery, comprising:

the battery comprises a battery core (4), wherein both ends of the battery core (4) along the length direction of the battery are respectively provided with a positive electrode lug (7) and a negative electrode lug (5);

a positive electrode post (2) and a negative electrode post (3), the positive electrode post (2) and the negative electrode post (3) being disposed on one top surface formed in the longitudinal direction and the width direction of the battery;

the positive electrode post (2) and the positive electrode lug (7) are connected together through a positive electrode connecting sheet, and the negative electrode post (3) and the negative electrode lug (5) are connected together through a negative electrode connecting sheet;

at least one of the positive electrode connecting sheet and the negative electrode connecting sheet is a split connecting sheet (6), the split connecting sheet (6) comprises a first connecting sheet (601) and a second connecting sheet (602) which are connected with each other, the first connecting sheet (601) is connected with a pole, the second connecting sheet (602) is connected with a pole lug, and the first connecting sheet (601) and the second connecting sheet (602) are connected through surface contact.

2. A rechargeable battery according to claim 1, wherein: the widths of the first connecting sheet (601) and the second connecting sheet (602) are consistent with the width of the battery cell (4).

3. A rechargeable battery according to claim 2, wherein: the first connecting sheet (601) is of a flat plate type structure, and the second connecting sheet (602) is of an L-shaped structure.

4. A rechargeable battery according to claim 3, wherein: the first connecting piece (601) comprises a first bending surface (6010), the second connecting piece (602) comprises a second bending surface (6020), and the first bending surface (6010) and the second bending surface (6020) are connected together.

5. A rechargeable battery according to claim 4, wherein: after the first bending surface (6010) and the second bending surface (6020) are connected, the first bending surface is bent towards the direction close to the second connecting sheet (602), and the first bending surface and the second bending surface are bent to the direction close to the second connecting sheet (602).

6. A rechargeable battery according to claim 2, wherein: the first connecting sheet (601) is of an L-shaped structure, and the second connecting sheet (602) is of a flat plate-shaped structure.

7. A rechargeable battery according to claim 6, wherein: the first connecting piece (601) comprises a first bending surface (6010), the second connecting piece (602) comprises a second bending surface (6020), and the first bending surface (6010) and the second bending surface (6020) are connected together.

8. A rechargeable battery according to claim 7, wherein: the second connecting piece (602) is located between the first bending surface (6010) and the battery cell (4).

9. A rechargeable battery according to any one of claims 1-8, wherein: the battery cell (4) is arranged in the aluminum shell.

10. A rechargeable battery according to claim 9, wherein: and insulating glue is coated on one surface of the positive electrode connecting sheet and the negative electrode connecting sheet, which is contacted with the aluminum shell.