CN221447410U - Battery connection piece, terminal structure and battery - Google Patents

Abstract

The utility model discloses a battery connecting piece, a terminal structure and a battery, which belong to the technical field of lithium batteries, wherein the connecting piece is arranged between a terminal and a battery core and comprises a base body, a plurality of hollowed holes are formed in the base body around the circumference of a connecting position of the base body and the terminal, a fuse area is formed between adjacent hollowed holes, a connecting area is formed in the area surrounded by the hollowed holes, and the fuse area is fused to enable the connecting area to fall off. Terminal structure, including rivet and base plate, the rivet runs through the base plate setting, the inside one end of rivet position in the battery is connected with the junction area of battery connection piece as above, fuse district fusing makes the junction area with the rivet separation. The battery comprises an electric core, a shell and the terminal structure. The fuse region is fused, so that the connecting region is separated from the rivet, the fuse structure is fused more thoroughly, and the fuse structure can be prevented from being adhered with other parts when fused.

Description

Battery connection piece, terminal structure and battery

Technical Field

The utility model relates to the technical field of lithium batteries, in particular to a battery connecting sheet, a terminal structure and a battery.

Background

The lithium ion power battery has the advantages of high energy density, high power density, multiple recycling times, long storage time and the like, has wider application prospect on electric vehicles such as electric bicycles, electric automobiles and the like and energy storage facilities, can be widely applied, and can effectively solve the problems of environmental pollution, energy crisis and the like.

The lithium ion battery is obtained by winding or superposing a positive plate, a diaphragm and a negative plate into a pole core, placing the pole core into a cavity formed by a battery shell and a sealing cover plate, injecting electrolyte into the cavity, and sealing and forming. The sealing cover plate is used as an indispensable component assembly of a lithium battery sealing element, and has important significance in safety, sealing performance, aging resistance, insulativity, the size of the space occupied in the battery and the like. The battery cover plate mainly comprises an end cover and a terminal structure arranged on the end cover, wherein the terminal structure generally comprises a pole, a connecting sheet and a shell arranged on the periphery of the pole.

To improve the safety of the battery, a fuse area is usually formed on the connection tab, and when the battery is overcharged, the fuse area fuses to cut off the circuit. For example, chinese patent document CN115332695A discloses a cover plate structure and a battery, wherein the busbar plate includes a busbar plate main body and a fuse structure, the fuse structure includes a first portion and a second portion, the first portion passes through the lower plastic and is electrically connected with the top cover, the second portion is connected with the busbar plate main body, and the busbar plate main body is located outside the limit space and is abutted against the support protrusion. The fuse structure is folding with the collection flow disc when the assembly, and the beta structure can lead to collection flow disc to occupy more space, and the fuse structure can take place the adhesion with peripheral component when the fusing moreover.

Disclosure of utility model

1. Technical problem to be solved by the utility model

Aiming at the problems that a fuse structure of a folding structure of a battery cover plate in the prior art can cause a bus plate to occupy more space and the fuse structure possibly adheres to peripheral components when being fused, the utility model provides a battery connecting piece, the fuse structure is fused more thoroughly, and the fuse structure can be prevented from adhering to the peripheral components when being fused.

The utility model also provides a battery terminal structure which comprises a rivet and a substrate, wherein the rivet is connected with the connecting area of the battery connecting piece.

The utility model also provides a battery which comprises the terminal structure and the connecting sheet.

2. Technical proposal

In order to achieve the above purpose, the utility model provides a battery connecting piece which is arranged between a terminal and a battery core and comprises a base body, wherein a plurality of hollowed holes are formed in the base body around the circumference of the connecting position of the base body and the terminal, a fuse area is formed between the adjacent hollowed holes, a connecting area is formed in the area surrounded by the hollowed holes, and the fuse area is fused to enable the connecting area to fall off.

Further, the substrate is a round flat sheet, and the connecting area is positioned at the center of the substrate.

Further, the plurality of hollowed holes are arranged around the center of the matrix, the hollowed holes are strip-shaped holes, and the distance between two adjacent hollowed holes is equal.

The utility model also provides a battery terminal structure, which comprises a rivet and a substrate, wherein the rivet penetrates through the substrate, one end of the rivet, which is positioned in the battery, is connected with the connecting area of the battery connecting piece, and the fuse area is fused to separate the connecting area from the rivet.

Further, the rivet both ends are provided with first turn-ups portion and second turn-ups portion respectively, install first insulation board between first turn-ups portion and the second turn-ups portion, be provided with the riveting ring between first insulation board and the first turn-ups portion, first turn-ups portion and riveting ring contact.

Further, an annular groove is formed in the end face, facing the first flanging part, of the first insulating plate, and the riveting ring is embedded into the annular groove.

Further, a sealing member is arranged between the second flanging part and the base plate, and the sealing member seals a gap between the rivet and the base plate.

The utility model also provides a battery, which comprises a battery core, a shell and the terminal structure, wherein the terminal structure is connected with one side of the shell in a sealing way through a substrate; the battery cell is connected with the rivet through the connecting sheet.

Further, the second flanging part is connected with the connecting sheet.

Further, a liquid injection port is formed in one end, opposite to the terminal structure, of the 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 battery connecting piece, the fuse region is formed between the adjacent hollowed holes, when the battery is overcharged, the fuse is unblown, so that the connecting region is separated from the rivet, the fuse structure is fused more thoroughly, adhesion between the fuse structure and other parts can be prevented when the fuse structure is fused, and the safety of the battery is improved.

(2) Compared with a bus plate in the prior art, the battery connecting piece has the advantages that the folding structure is omitted, the structure is more simplified, the occupation of the connecting piece to the internal space of a battery can be reduced, and the energy density of the battery is further improved.

(3) According to the battery terminal structure, the first insulating plate is arranged in the mounting grooves of the first flanging part and the second flanging part, and the rivet is insulated from the base plate by the first insulating plate. Set up the riveting ring between first insulation board and the first turn-ups portion, first turn-ups portion and riveting ring contact, when rivet and base plate riveting, the pressure of the first turn-ups portion of rivet is exerted on the riveting ring, and the existence of riveting ring can avoid first turn-ups portion to directly press on first insulation board, avoids first insulation board damage.

(4) According to the battery terminal structure, the riveting ring is embedded in the annular groove of the first insulating plate, so that the volumes of the first insulating plate and the riveting ring are overlapped, and the space occupation of the riveting ring on the terminal structure is reduced. The first flanging part and the second flanging part are outwards flanged from the center of the end part, so that the area of the end part of the rivet can be increased, the contact area of the first flanging part and the riveting ring can be increased, the pressure intensity on the riveting ring during riveting is reduced, and the first insulating plate is further prevented from being damaged by pressure. The second flanging part has larger flanging size and larger contact area, so that the second flanging part can be directly contacted with the second insulating plate, and the pressure intensity on the second insulating plate can be reduced. The sealing member can seal the gap between the rivet and the substrate to prevent leakage.

(5) According to the battery, the shell is connected with the terminal structure, and the terminal structure of the battery has good structural strength. The electric core and the rivet are connected through the connecting sheet, and the rivet can lead out electric energy. The second flanging part and the first flanging part can be respectively connected with the connecting sheet, namely, the terminal structure can be inverted, and the terminal can be fixed from the outside or the inside of the battery core, so that the flexibility of the structural design of the battery is improved. And one side of the battery shell opposite to the terminal structure is provided with a liquid injection port, the liquid injection port avoids the terminal structure, the caliber of the liquid injection port can be increased, the liquid injection efficiency is improved, and the production beat is promoted.

Drawings

In the drawings, the dimensions and proportions are not representative of the dimensions and proportions of an actual product. The figures are merely illustrative and certain unnecessary elements or features have been omitted for clarity.

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

FIG. 2 is a cross-sectional view of the battery of FIG. 1 taken along line A-A;

FIG. 3 is a schematic top view of the cross-section of FIG. 2;

FIG. 4 is a schematic view of the bottom structure of the cross-sectional view of FIG. 2;

Fig. 5 is a schematic structural view of a connecting piece according to an embodiment of the present utility model.

Reference numerals in the schematic drawings illustrate:

1. A rivet; 101. a first burring part; 102. a second burring part; 2. a rivet ring; 3. a first insulating plate; 4. a substrate; 5. a seal; 6. a second insulating plate; 7. a base; 701. a hollowed hole; 702. a fuse region; 703. a connection region; 8. a battery cell; 9. a housing; 10. and a liquid injection port.

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. What has been described herein is merely a preferred embodiment according to the present utility model, and other ways of implementing the utility model will occur to those skilled in the art on the basis of the preferred embodiment, and are within the scope of the utility model.

In the description of the present utility model, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," "horizontal," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate description of the present utility model and simplify the description, and do not indicate or imply that the apparatus or elements referred to 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," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Examples

Referring to fig. 1-5, the present embodiment provides a battery including a cell 8, a housing 9, and a terminal structure including a rivet 1 and a substrate 4, the rivet 1 being disposed through the substrate 4. The terminal structure is hermetically connected to one side of the housing 9 via the substrate 4. As shown in fig. 3 and fig. 4, the battery cell 8 is in a winding core structure in this embodiment, and the upper and lower ends of the battery cell 8 are respectively provided with a positive electrode foil and a negative electrode foil. The terminal structure is welded with the shell 9 through the substrate 4, so that the tightness, safety, aging resistance and insulativity of the battery are ensured. The cell 8 is connected with the rivet 1 through a connecting sheet, specifically, the second flanging part 102 of the rivet 1 is connected with the connecting sheet, the connecting sheet is connected with the cell 8, the rivet 1 can conduct out electric energy of a battery, and the rivet 1 has the function of a pole.

It should be noted that, as shown in fig. 5, the connecting piece includes the base 7, the whole base 7 presents in a flat sheet shape, the bending part of the traditional structure is eliminated, the structure is more simplified, the occupation of the terminal structure to the internal space of the battery can be reduced, the weight of the battery structure can be reduced, and the energy density of the battery can be improved. Be provided with four fretholes 701 on the base member 7, four fretholes 701 are around the circumference setting with rivet 1's hookup location, form fuse district 702 between the adjacent fretholes 701, the district that a plurality of fretholes 701 encircle forms connecting region 703, when the electric current in the circuit exceeded the rating or the temperature of battery risees to certain value, fuse district 702 fuses and makes connecting region 703 drop, thereby connecting region 703 and rivet 1 separate, fuse district 702 structure fuses more thoroughly, can prevent fuse structure and other parts from taking place the adhesion when fusing, make circuit disconnection protect group battery and power consumption from destroying, improve the security of power consumption.

Further, in this embodiment, as shown in fig. 5, the base 7 of the connecting piece is a circular flat piece, and the connecting area 703 is located at the center of the base 7 of the connecting piece. The hollowed holes 701 are symmetrically arranged about the center of the substrate 7 of the connecting sheet, the hollowed holes 701 are strip-shaped holes, and the distance between two adjacent hollowed holes 701 is equal. It should be noted that the hollowed-out hole 701 may be asymmetrically disposed around the center of the substrate 7.

Since the rivet 1 and the base plate 4 are fixed by caulking, in order to ensure the stability of the caulking, in this embodiment, as shown in fig. 3 and 4, the two ends of the rivet 1 are respectively provided with a first flange portion 101 and a second flange portion 102, and a mounting groove surrounding the rivet 1 is formed between the first flange portion 101 and the second flange portion 102. The rivet 1 is installed first insulation board 3 in mounting groove department, and first insulation board 3 cup joints the lateral surface at rivet 1, and first insulation board 3 keeps apart rivet 1 and base plate 4, insulates rivet 1 and base plate 4. A caulking ring 2 is provided between the first insulating plate 3 and the first burring 101, and the first burring 101 is in contact with the caulking ring 2. When the rivet 1 is riveted with the base plate 4, the pressure of the first flanging part 101 of the rivet 1 presses the riveting ring 2, and the existence of the riveting ring 2 can prevent the first flanging part 101 from directly pressing on the first insulating plate 3, so that the first insulating plate 3 is prevented from being damaged.

Furthermore, the end face of the first insulating plate 3, which faces the first flanging part 101, is provided with an annular groove, and the riveting ring 2 is embedded into the annular groove, so that the first insulating plate 3 can be overlapped with the volume of the riveting ring 2, the space occupation of the riveting ring 2 to the terminal structure is reduced, and the whole terminal structure is reduced. The annular groove also reduces the weight of the first insulating plate 3 to some extent, which is advantageous in reducing the overall weight of the battery.

The first flange portion 101 and the second flange portion 102 are each flange outward from the center of the end of the rivet 1, and the flange size is 0.1mm to 10mm, specifically, the flange size is reasonably selected from 0.1mm, 1mm, 2mm, 4mm, 5mm, 6mm, 8mm or 10mm according to design requirements. The first flanging part 101 and the second flanging part 102 are both flanged outwards from the center of the end part of the rivet 1, so that the area of the end part of the rivet 1 can be increased, the contact area between the first flanging part 101 and the riveting ring 2 can be increased, the pressure intensity on the riveting ring 2 during riveting is reduced, and the first insulating plate 3 is further prevented from being damaged by pressure. A second insulating plate 6 is provided between the base plate 4 and the second burring 102, and the second insulating plate 6 insulates the rivet 1 from the base plate 4. The second burring 102 has a burring size larger than that of the first burring 101, and the burring 102 has a larger contact area, so that the second burring 102 can directly contact the second insulating plate 6, and the pressure to the second insulating plate 6 can be reduced.

In addition, in the present embodiment, in order to enhance the seal between the base plate 4 and the rivet 1, a seal 5 is provided between the base plate 4 and the second burring 102, and the seal 5 seals the gap between the rivet 1 and the base plate 4 to prevent leakage. The sealing member 5 is mainly a sealing ring, the sealing ring is sleeved on the outer side of the rivet 1, and the sealing ring is preferably made of a material with insulating performance, for example, fluororubber material can be adopted.

Unlike the general battery structure, in this embodiment, as shown in fig. 2 and 4, the end of the housing 9 opposite to the terminal structure is provided with the liquid injection port 10, i.e. the liquid injection port 10 is disposed at the bottom of the housing 9, avoiding the terminal structure at the top of the battery, so that the caliber of the liquid injection port 10 can be designed to be larger as much as possible, thereby improving the liquid injection efficiency and the production beat. The filling port 10 is sealed after filling is completed to prevent leakage of the electrolyte.

Example 2

Unlike the first embodiment, in which the first flange portion 101 is connected to the connection piece and the terminal structure is inverted with respect to the first embodiment, the first flange portion 101 is located inside the battery, and the second flange portion 102 is located outside the battery, the first flange portion 101 fixes the rivet 1 and the base plate 4 from inside the battery, increasing flexibility in structural design of the battery.

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 (10)

1. The utility model provides a battery connection piece, sets up between terminal and electric core (8), its characterized in that, including base member (7), base member (7) are provided with a plurality of fretwork holes (701) around the circumference with the hookup location of terminal, adjacent form fuse district (702) between fretwork holes (701), a plurality of the district that fretwork holes (701) encircle forms connecting region (703), fuse district (702) fuses and makes connecting region (703) drop.

2. A battery connection piece according to claim 1, characterized in that the base body (7) is a circular flat piece, and the connection zone (703) is located in the centre of the base body (7).

3. A battery connection piece according to claim 2, characterized in that a plurality of hollowed-out holes (701) are arranged around the center of the base body (7), the hollowed-out holes (701) are strip-shaped holes, and the distance between two adjacent hollowed-out holes (701) is equidistant.

4. A battery terminal structure comprising a rivet (1) and a substrate (4), wherein the rivet (1) is arranged through the substrate (4), and characterized in that one end of the rivet (1) located inside a battery is connected with a connecting region (703) of a battery connecting sheet according to any one of claims 1-3, and the fuse region (702) is fused to separate the connecting region (703) from the rivet (1).

5. The battery terminal structure according to claim 4, wherein the rivet (1) is provided with a first flange portion (101) and a second flange portion (102) at both ends, a first insulating plate (3) is installed between the first flange portion (101) and the second flange portion (102), a riveting ring (2) is provided between the first insulating plate (3) and the first flange portion (101), and the first flange portion (101) is in contact with the riveting ring (2).

6. A battery terminal structure according to claim 5, wherein the end face of the first insulating plate (3) facing the first burring part (101) is provided with an annular groove, and the caulking ring (2) is embedded in the annular groove.

7. The battery terminal structure according to claim 5, wherein a seal member (5) is provided between the second burring portion (102) and the base plate (4), the seal member (5) sealing a gap between the rivet (1) and the base plate (4).

8. A battery, characterized by comprising an electric core (8), a shell (9) and the terminal structure as claimed in any one of claims 4-7, wherein the terminal structure is connected with one side of the shell (9) in a sealing manner through a substrate (4); the battery cell (8) is connected with the rivet (1) through the connecting sheet.

9. A battery according to claim 8, wherein the second flange portion (102) is connected to the connecting piece.

10. A battery according to claim 8, wherein the end of the housing (9) opposite the terminal structure is provided with a filling opening (10).