CN220341460U

CN220341460U - Battery structure

Info

Publication number: CN220341460U
Application number: CN202320088141.8U
Authority: CN
Inventors: 章涵; 韩盼; 文哲泽; 甘强; 王超骐; 程骞
Original assignee: Shanghai Guoxuan New Energy Co Ltd
Current assignee: Shanghai Guoxuan New Energy Co Ltd
Priority date: 2023-01-30
Filing date: 2023-01-30
Publication date: 2024-01-12
Anticipated expiration: 2033-01-30

Abstract

The utility model discloses a battery structure, which relates to the technical field of battery manufacturing and comprises a winding core, a negative electrode end, a positive electrode current collecting disc and a shell, wherein one end of the shell is provided with the positive electrode end, the winding core is arranged in the shell, the positive electrode lug of the winding core is connected with the positive electrode end through the positive electrode current collecting disc, the other end of the shell is provided with the negative electrode end, and the negative electrode end part is directly contacted with the negative electrode lug of the winding core. The battery structure omits a diversion switching structure, has simple whole design structure, simple processing process and strong feasibility, improves the production efficiency, does not need to arrange the diversion switching structure, saves the internal space of the battery and improves the specific energy of the battery; in addition, the battery has large welding area and strong overcurrent capacity at the diversion connection part, and is suitable for high-rate batteries.

Description

Battery structure

Technical Field

The utility model relates to the technical field of battery manufacturing, in particular to a battery structure.

Background

With the general application of lithium batteries in the electric automobile industry, the research of lithium batteries with high-rate and high-specific energy charge and discharge is receiving a great deal of attention.

The existing lithium battery generally adopts a battery winding core with full lugs, the anode and the cathode of the winding core lugs are welded with a switching structure, and the switching structure is welded with a battery cover plate or a pole column to realize flow guiding. The various switching structures are adopted and need to be welded with the winding core, so that the manufacturing process is complex, the cost of the battery is increased, meanwhile, the switching structure occupies the internal space of the battery, and the weight of the battery is increased. Therefore, it is necessary to design a structure that satisfies the simple process, saves the battery space, and satisfies the high-power charge and discharge of the battery.

Disclosure of Invention

The utility model aims to provide a battery structure which is simple in structure and convenient to produce and process and can meet the requirement of high-power charge and discharge of batteries.

The technical scheme adopted by the utility model is as follows:

the battery structure comprises a winding core, a negative electrode end, a positive electrode current collecting disc and a shell, wherein one end of the shell is provided with the positive electrode end, the winding core is arranged in the shell, the positive electrode lug of the winding core is connected with the positive electrode end through the positive electrode current collecting disc, the other end of the shell is provided with the negative electrode end, and the negative electrode end part is directly contacted with the negative electrode lug of the winding core.

Preferably, the negative electrode end comprises a negative electrode cover plate, an opening is formed in the other end of the shell, and the negative electrode cover plate is installed at the opening and used for closing the opening.

As a further preferable mode, the negative electrode cover plate further comprises a sealing piece, the negative electrode cover plate is at least partially sunken towards the direction close to the negative electrode lug to form a concave structure, the concave structure is in contact with the negative electrode lug, and the sealing piece is arranged at an opening of the concave structure and is used for sealing the opening of the concave structure.

As a further preferable mode, the sealing piece further comprises an explosion-proof valve, wherein the sealing piece is provided with a mounting hole, and the explosion-proof valve is arranged in the mounting hole.

As a further preferable mode, the concave structure is provided with a liquid injection port, and the liquid injection port is communicated with the inner cavity of the concave structure and the mounting hole.

Preferably, the positive electrode end comprises a positive electrode cover plate post, the positive electrode cover plate post is mounted at one end of the shell, and a positioning hole is formed in the positive electrode cover plate post.

As a further preferable aspect, the axial section of the positive electrode cover plate pole is in an i-shape.

As a further preferable aspect, the battery pack further comprises an insulating member, a through hole is formed in one end of the housing, the positive electrode cap post is located in the through hole, the insulating member is sleeved on the outer side of the positive electrode cap post, and the positive electrode cap post is installed in the through hole through the insulating member.

As a further preferable aspect, the battery pack further comprises a sealing ring, and the sealing ring is arranged between the insulating member and the positive electrode cover plate post.

As a further preferred aspect, the positive electrode current collecting disc includes a current collecting disc base and a current collecting disc post disposed on the current collecting disc base, the current collecting disc post is mounted in the positioning hole, the current collecting disc base abuts against the positive electrode cover plate post and the insulating member, and the current collecting disc base contacts with the positive electrode tab.

The technical scheme has the following advantages or beneficial effects:

(1) The battery structure omits a diversion switching structure, has simple whole design structure and simple processing process, has strong feasibility and improves the production efficiency;

(2) According to the battery structure, a diversion switching structure is not required, so that the internal space of the battery is saved, and the specific energy of the battery is improved; in addition, the battery has large welding area and strong overcurrent capacity at the diversion connection part, and is suitable for high-rate batteries.

Drawings

Fig. 1 is a schematic view of the internal structure of a battery structure in the present utility model;

fig. 2 is an exploded view of the battery structure in the present utility model.

In the figure: 1. a winding core; 11. a positive electrode tab; 12. a negative electrode ear; 13. a core material rolling area; 2. a negative terminal; 21. a negative electrode cover plate; 22. a sealing sheet; 23. a concave structure; 24. an explosion-proof valve; 25. a liquid injection port; 3. a positive electrode current collecting plate; 31. a collecting tray base; 32. a collector plate pole; 4. a housing; 5. a positive terminal; 51. a positive cap plate pole; 52. an insulating member; 53. positioning holes; 54. and (3) sealing rings.

Detailed Description

The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that, if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are used, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, only for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the indicated apparatus or element must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," "third," and the like, as used herein, are used for descriptive purposes only and are not to be construed as indicating or implying any relative importance.

In the description of the present utility model, it should be noted that unless explicitly stated and limited otherwise, the terms "mounted," "connected," and "connected" should be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

Fig. 1 is a schematic view of the internal structure of a battery structure in the present utility model; fig. 2 is an exploded view of the battery structure of the present utility model, please refer to fig. 1 to 2, which shows a preferred embodiment, and the battery structure includes a winding core 1, a negative electrode end 2, a positive electrode current collecting plate 3, and a housing 4 with a positive electrode end 5 at one end, wherein the winding core 1 is disposed in the housing 4, the positive electrode tab 11 of the winding core 1 is connected with the positive electrode end 5 through the positive electrode current collecting plate 3, the other end of the housing 4 has a negative electrode end 2, and the negative electrode end 2 is partially in direct contact with the negative electrode tab 12 of the winding core 1. In this embodiment, referring to fig. 1, the upper end of the housing 4 is welded with the positive electrode terminal 5, and in other embodiments, the positive electrode terminal 5 and the housing 4 may be integrally designed. The winding core 1 includes a winding core material region 13, and the positive tab 11 is disposed at an upper end of the winding core material region 13, the negative tab 12 is disposed at a lower end of the winding core material region 13, and the positive tab 11 and the negative tab 12 are integrally connected with the winding core material region 13. The upper end of the positive electrode lug 11 and the lower end of the positive electrode current collecting disc 3 are welded by laser or ultrasonic, and the flow guiding of the positive electrode is completed between the upper end of the positive electrode current collecting disc 3 and the positive electrode 5 by welding. The battery structure in the embodiment omits the traditional flow guiding and switching structure, and has the advantages of simple whole design structure, simple processing process, strong practicality and production efficiency improvement. Meanwhile, the diversion switching structure is omitted, so that the internal space of the battery is saved, and the specific energy of the battery is improved. In addition, the battery has large welding area and strong overcurrent capacity at the diversion connection part, and is suitable for high-rate batteries.

Further, as a preferred embodiment, the positive electrode terminal 5 includes a positive electrode cap post 51, the positive electrode cap post 51 is mounted on one end of the housing 4, and the positive electrode cap post 51 is provided with a positioning hole 53.

Further, as a preferred embodiment, the axial cross section of the positive electrode cap plate pole 51 is provided in an "i" shape. In this embodiment, as shown in fig. 1, the width of the upper end of the positive electrode cover plate pole 51 is smaller than that of the lower end, and the positioning hole 53 penetrates through the middle of the positive electrode cover plate pole 51 along the axial direction of the positive electrode cover plate pole 51, and the positive electrode cover plate pole 51 is in an "h" shape, so as to be convenient for connection with the housing 4.

Further, as a preferred embodiment, the battery pack further comprises an insulating member 52, a through hole is formed in one end of the housing 4, the positive electrode cap post 51 is partially located in the through hole, the insulating member 52 is sleeved on the outer side of the positive electrode cap post 51, and the positive electrode cap post 51 is installed in the through hole through the insulating member 52. Referring to fig. 1, the diameter of the through hole is smaller than that of the casing 4, and the lower end of the positive electrode cap post 51 passes through the through hole and enters the large casing 4, the upper end of the positive electrode cap post 51 is located outside the casing 4, and the insulating member 52 is provided to completely wrap the outer peripheral wall of the positive electrode cap post 51 for insulation between the casing 4 and the positive electrode cap post 51. Wherein the insulator 52 is in sealing engagement with the outer peripheral wall of the positive cap plate post 51. The insulator 52 and the housing 4 may be welded together.

Further, as a preferred embodiment, a sealing ring 54 is further included, and the sealing ring 54 is disposed between the insulating member 52 and the positive electrode cap plate post 51. As shown in fig. 1, a sealing ring 54 is disposed at the outer edge of the upper end of the positive electrode cap post 51 and located inside the insulating member 52, for sealing between the insulating member 52 and the inner wall of the positive electrode cap post 51. The sealing ring 54 is provided to prevent leakage of the electrolyte of the battery in the case 4.

Further, as a preferred embodiment, the positive electrode current collecting plate 3 includes a current collecting plate base 31 and a current collecting plate post 32 disposed on the current collecting plate base 31, the current collecting plate post 32 is mounted in the positioning hole 53, the current collecting plate base 31 abuts against the positive electrode cover plate post 51 and the insulating member 52, and the current collecting plate base 31 contacts the positive electrode tab 11. In this embodiment, the current collecting plate base 31 and the current collecting plate pole 32 are integrally formed, wherein the diameter of the positioning hole 53 is slightly larger than that of the current collecting plate pole 32, so that the current collecting plate pole 32 is conveniently inserted into the positioning hole 53. The upper surface of the current collecting tray base 31 is welded to the lower surfaces of the positive electrode cap plate pole 51 and the insulator 52, so that leakage of electrolyte can be avoided. The collector plate post 32 and the positive cover plate post 51 are made of the same or similar materials.

Further, as a preferred embodiment, the negative electrode terminal 2 includes a negative electrode cover plate 21, the other end of the casing 4 is provided with an opening, and the negative electrode cover plate 21 is mounted at the opening for closing the opening. The negative electrode cap 21 in the present embodiment is connected to the case 4 such that the case 4 integrally forms a negative electrode, and the positive electrode terminal 5 is separated from the case 4 by an insulator 52.

Further, as a preferred embodiment, the cathode cover plate 21 further comprises a sealing piece 22, at least part of the cathode cover plate 21 is recessed towards the direction approaching to the cathode ear 12 to form a concave structure 23, the concave structure 23 is in contact with the cathode ear 12, and the sealing piece 22 is arranged at the opening of the concave structure 23 and is used for sealing the opening of the concave structure 23. In this embodiment, referring to the direction shown in fig. 1, the middle portion of negative electrode cap plate 21 is recessed toward the inside of case 4 or toward negative electrode tab 12, forming concave structure 23. The cavity of the concave structure 23 may be used as a passage through which electrolyte of the battery flows. And the sealing plate 22 is provided for sealing the opening position of the concave structure 23 to prevent leakage of the electrolyte of the battery.

Further, as a preferred embodiment, the sealing plate further comprises an explosion-proof valve 24, the sealing plate 22 is provided with a mounting hole, and the explosion-proof valve 24 is arranged in the mounting hole. The explosion-proof valve 24 is provided to prevent the electrolyte of the battery from being exposed from the mounting hole and to facilitate the addition of the electrolyte into the cavity of the concave structure 23.

Further, as a preferred embodiment, the concave structure 23 is provided with a liquid injection port 25, and the liquid injection port 25 is communicated with the inner cavity of the concave structure 23 and the mounting hole. Referring to fig. 1 and 2, when electrolyte is injected into the concave structure 23 through the mounting hole, the electrolyte enters the inner cavity of the concave structure 23 and enters the winding core 1 through the liquid injection port 25.

In this embodiment, during the production of the battery, first, the positive tab 11 of the winding core 1 contacts with the bottom of the positive current collecting plate 3, and the connection of the contact surface is completed by laser welding or ultrasonic welding. Then, the collector plate pole 32 at the upper end of the positive electrode collector plate 3 is connected with the positive electrode cover plate pole 51 at the upper end of the shell 4, and the flow guiding of the positive electrode is completed through welding. Then, the negative electrode lug 12 of the winding core 1 and the concave structure 23 on the negative electrode cover plate 21 are welded to realize the negative electrode diversion of the winding core 1; the concave structure 23 is provided with a liquid injection port 25, and electrolyte of the battery can flow into the winding core 1 through the liquid injection port 25; finally, the sealing of the battery is completed by welding the joint of the sealing piece 22 and the negative electrode cover plate 21 and the joint of the negative electrode cover plate 21 and the shell 4.

The foregoing description is only illustrative of the preferred embodiments of the present utility model and is not to be construed as limiting the scope of the utility model, and it will be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present utility model, and are intended to be included within the scope of the present utility model.

Claims

1. The utility model provides a battery structure, its characterized in that includes core, negative pole end, anodal current collecting disc and one end have the casing of positive pole end, the core is located in the casing, the anodal ear of core passes through anodal current collecting disc with anodal end is connected, the other end of casing has the negative pole end, negative pole end portion directly with the negative pole ear contact of core, the negative pole end includes the negative pole apron, the opening has been seted up to the other end of casing, the negative pole apron install in the opening part is used for sealing the opening, negative pole apron is at least partly to be close to the direction of negative pole ear is sunken to form concave type structure, concave type structure with negative pole ear contact.

2. The battery structure of claim 1, further comprising a sealing tab disposed at the opening of the concave structure for closing the opening of the concave structure.

3. The battery structure of claim 2, further comprising an explosion-proof valve, wherein the sealing plate is provided with a mounting hole, and the explosion-proof valve is arranged in the mounting hole.

4. The battery structure of claim 3, wherein the concave structure is provided with a liquid injection port, and the liquid injection port is communicated with the inner cavity of the concave structure and the mounting hole.

5. The battery structure of claim 1, wherein the positive terminal comprises a positive cover post, the positive cover post is mounted to one end of the housing, and the positive cover post is provided with a positioning hole.

6. The battery structure of claim 5, wherein the axial cross section of the positive cap plate post is configured in an "i" shape.

7. The battery structure of claim 5, further comprising an insulator, wherein a through hole is formed in one end of the housing, the positive cap post portion is located in the through hole, the insulator is sleeved outside the positive cap post, and the positive cap post is mounted in the through hole through the insulator.

8. The battery structure of claim 7, further comprising a seal ring disposed between the insulator and the positive cover post.

9. The battery structure of claim 7, wherein the positive current collector plate comprises a current collector plate base and a current collector plate post provided on the current collector plate base, the current collector plate post is mounted in the positioning hole, the current collector plate base abuts against the positive cover plate post and the insulating member, and the current collector plate base contacts with the positive tab.