CN214957083U

CN214957083U - Cylindrical lithium ion battery

Info

Publication number: CN214957083U
Application number: CN202023253529.4U
Authority: CN
Inventors: ***; 丁坤; 钱建峰
Original assignee: Phylion Battery Co Ltd
Current assignee: Phylion Battery Co Ltd
Priority date: 2020-12-29
Filing date: 2020-12-29
Publication date: 2021-11-30
Anticipated expiration: 2030-12-29

Abstract

The utility model discloses a cylindrical lithium ion battery, include the casing and hold the electric core unit in the casing, the casing comprises the positive pole apron and the negative pole apron at pipy barrel, both ends, its characterized in that: the periphery of the positive cover plate is coated with a positive sealing ring, the periphery of the negative cover plate is coated with a negative sealing ring, and two ends of the cylinder are respectively coated on the positive sealing ring and the negative sealing ring through mechanical rolling to form a shell of the battery; and the positive cover plate is provided with a safety valve mounting hole, and the safety valve is fixed on the positive cover plate and seals the safety valve mounting hole. The utility model discloses a lithium ion battery's two mechanical seal overall structure in casing both ends has both simplified the processing procedure, and the equipment quality of battery has been guaranteed in the installation of the negative electrode connection structure of being convenient for again.

Description

Cylindrical lithium ion battery

Technical Field

The utility model relates to a lithium ion battery, concretely relates to cylindrical lithium ion battery.

Background

The cylindrical lithium ion battery has certain advantages in manufacturing process because the battery core is prepared in a winding mode. Generally, a cylindrical lithium ion battery is composed of a cylindrical shell and an internal battery cell unit, the battery cell unit is generally formed by stacking and winding a positive pole piece, a diaphragm and a negative pole piece, the positive pole piece and the negative pole piece are respectively provided with a tab for leading out current, and the two ends of the cylindrical shell are respectively provided with a positive pole cover plate and a negative pole cover plate. The cylindrical casing is generally composed of a cylindrical structure and a positive electrode cover plate, and the cylindrical structure can be an integrally formed structure or a structure formed by welding a negative electrode cover plate to one end of a circular tube.

For example, chinese patent CN101202330B discloses a cylindrical lithium battery, which includes a cylindrical body, a battery unit accommodated in the cylindrical body, an upper cover plate and a lower cover plate for sealing the cylindrical body, wherein a support is disposed at the axis of the battery unit, the support is a hollow metal cylinder, and the support and the lower cover plate are welded together. Wherein, the lower cover plate and the cylinder body are welded into an integral structure, and the upper cover plate and the cylinder body wall are sealed by mechanical rolling forming. Because lower apron and barrel constitute an organic whole structure, when arranging negative electrode extraction structure, the processing degree of difficulty is great, and if adopt the postweld mode, then the sealed effect of welding is difficult to control, and has the dust to get into inside the battery easily.

On the other hand, at the positive electrode end, the electrode lead-out structure, the insulating sheet, the safety valve, the positive electrode cover plate and other multilayer structures are overlapped and then mechanically rolled and sealed, the overlapping structure is complex, and the positioning control difficulty is high in the mechanical rolling process.

Therefore, the shell closed assembly structure of the cylindrical lithium ion battery is improved, the processing difficulty can be simplified, the assembly quality of the battery is improved, and the sealing performance is ensured.

Disclosure of Invention

The invention aims to provide a cylindrical lithium ion battery, which improves the packaging structure of a cylindrical shell, and is easy to process and good in sealing performance.

In order to achieve the purpose of the invention, the technical scheme adopted by the utility model is as follows: a cylindrical lithium ion battery comprises a shell and a battery cell unit accommodated in the shell, wherein the shell consists of a tubular barrel body, a positive cover plate and a negative cover plate, the positive cover plate and the negative cover plate are arranged at two ends of the tubular barrel body respectively, a positive sealing ring is coated on the periphery of the positive cover plate, a negative sealing ring is coated on the periphery of the negative cover plate, and two ends of the barrel body are respectively coated on the positive sealing ring and the negative sealing ring through mechanical rolling to form a battery shell; and the positive cover plate is provided with a safety valve mounting hole, and the safety valve is fixed on the positive cover plate and seals the safety valve mounting hole.

Among the above-mentioned technical scheme, the both ends of barrel are respectively through the mechanical roll extrusion cladding on anodal sealing ring and negative pole sealing ring to need not weld negative pole apron in advance, make things convenient for negative pole electrode connection structure's equipment, and simultaneously, set up the relief valve on anodal apron, when carrying out the mechanical roll extrusion in anodal apron one side, do not have multilayer structure, easy processing, the safety valve hole can regard as notes liquid hole simultaneously, after the battery equipment, pour into electrolyte into earlier, install the relief valve at last after the processing is changed.

According to the technical scheme, the positive sealing ring is fixedly connected to the positive cover plate, and the negative sealing ring is fixedly connected to the negative cover plate. The sealing ring and the cover plate can be fixedly connected through injection molding, and mechanical rolling processing is further facilitated.

According to a preferable technical scheme, the positive cover plate is provided with a concave part at the periphery of the safety valve mounting hole to form a step structure, the concave part is used for accommodating the mounting valve, the center of the safety valve is located in the safety valve mounting hole, and the periphery of the safety valve is welded on the concave part of the positive cover plate.

Among the above-mentioned technical scheme, be equipped with the relief valve protective cover above the relief valve.

In the technical scheme, the center of the cell unit is provided with a supporting tube, the positive pole piece, the diaphragm and the negative pole piece are sequentially overlapped and then wound on the supporting tube, the upper end of the positive pole piece is connected to the positive cover plate through the positive pole lug and positive pole electrode connecting structure, and the lower end of the negative pole piece is connected to the negative cover plate through the negative pole lug and negative pole electrode connecting structure.

The supporting tube is a non-metal round tube, and a plurality of small holes are distributed in the side wall of the supporting tube.

Because of the application of the technical scheme, compared with the prior art, the utility model has the following advantages:

1. the utility model discloses a institutional advancement has realized lithium ion battery's two mechanical seal overall structure in casing both ends, has both simplified the processing procedure, and the equipment quality of battery has been guaranteed in the installation of the negative electrode connection structure of being convenient for again.

2. The utility model discloses with the relief valve setting on positive apron for two machinery seal processes realize more easily.

Drawings

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

FIG. 2 is a structural view from above of the positive terminal of the battery;

fig. 3 is a sectional view a-a of fig. 2.

Wherein: 1. a barrel; 2. a positive electrode cover plate; 3. a positive sealing ring; 4. a negative electrode cover plate; 5. a negative electrode sealing ring; 6. a safety valve mounting hole; 7. a safety valve; 8. a safety valve protecting cover; 9. supporting a tube; 10. and (4) a small hole.

Detailed Description

The invention will be further described with reference to the following drawings and examples:

the first embodiment is as follows: referring to fig. 1 to 3, a cylindrical lithium ion battery includes a case and a cell unit accommodated in the case. The casing comprises the anodal apron 2 and the negative pole apron 4 at pipy barrel 1, both ends, and the peripheral cladding of anodal apron 2 has anodal sealing ring 3, and the peripheral cladding of negative pole apron 4 has negative pole sealing ring 5, the casing of battery is constituteed to the both ends of barrel 1 through the cladding of mechanical roll extrusion respectively on anodal sealing ring 3 and negative pole sealing ring 5. The peripheries of the anode cover plate 2 and the cathode cover plate 4 can be thinned or bent, and the anode sealing ring 3 and the cathode sealing ring 5 are respectively fixed on the cover plates in an injection molding mode.

The positive electrode cover plate 2 is provided with a safety valve mounting hole 6, the periphery of the safety valve mounting hole 6 is of a two-stage step structure formed by sinking, the periphery of the safety valve 7 is fixed with the first stage step and seals the safety valve mounting hole 6, and a safety valve protective cover 8 is positioned on the safety valve 7 and the periphery of the safety valve protective cover is fixed with the second stage step.

The center of the cell unit is provided with a support tube 9, the support tube 9 is a non-metal round tube, such as a plastic tube, and a plurality of small holes 10 are distributed on the side wall of the support tube. The positive pole piece, the diaphragm and the negative pole piece are sequentially overlapped and then wound on the supporting tube, the upper end of the positive pole piece is connected to the positive cover plate through the positive pole lug and positive pole electrode connecting structure, and the lower end of the negative pole piece is connected to the negative cover plate through the negative pole lug and negative pole electrode connecting structure.

Claims

1. The utility model provides a cylindrical lithium ion battery, includes the casing and holds the electric core unit in the casing, the casing comprises the positive pole apron and the negative pole apron at tubulose barrel, both ends, its characterized in that: the periphery of the positive cover plate is coated with a positive sealing ring, the periphery of the negative cover plate is coated with a negative sealing ring, and two ends of the cylinder are respectively coated on the positive sealing ring and the negative sealing ring through mechanical rolling to form a shell of the battery; and the positive cover plate is provided with a safety valve mounting hole, and the safety valve is fixed on the positive cover plate and seals the safety valve mounting hole.

2. The cylindrical lithium ion battery of claim 1, wherein: the positive sealing ring is fixedly connected to the positive cover plate, and the negative sealing ring is fixedly connected to the negative cover plate.

3. The cylindrical lithium ion battery of claim 1, wherein: the positive cover plate is provided with a depressed part at the periphery of the safety valve mounting hole to form a step structure, the depressed part is used for accommodating the safety valve, the center of the safety valve is positioned in the safety valve mounting hole, and the periphery of the safety valve is welded on the depressed part of the positive cover plate.

4. The cylindrical lithium ion battery of claim 3, wherein: a safety valve protective cover is arranged above the safety valve.

5. The cylindrical lithium ion battery of claim 1, wherein: the battery cell unit is characterized in that a supporting tube is arranged in the center of the battery cell unit, a positive pole piece, a diaphragm and a negative pole piece are sequentially overlapped and then wound on the supporting tube, the upper end of the positive pole piece is connected to a positive cover plate through a positive pole lug and positive pole electrode connecting structure, and the lower end of the negative pole piece is connected to a negative cover plate through a negative pole lug and negative pole electrode connecting structure.

6. The cylindrical lithium ion battery of claim 5, wherein: the supporting tube is a non-metal round tube, and a plurality of small holes are distributed in the side wall of the supporting tube.