CN206250306U - With the cylindrical lithium ion battery for protecting liquid and vibration proof structure - Google Patents

Abstract

This utility model relates to a cylindrical lithium-ion battery with a liquid-retaining and shock-resistant structure, belonging to the field of batteries. The technical solution adopted by this utility model is as follows: a cylindrical lithium-ion battery with a liquid-retaining and shock-resistant structure includes a cell formed by rotating a positive electrode, a separator, and a negative electrode at intervals. The cell is disposed within a cylindrical steel shell, and the gap between the cell and the steel shell is filled with electrolyte. The cell has porous insulating pads at its upper and lower ends within the steel shell, with a central hole at the center of each pad. The beneficial technical effect of this utility model is that the porous insulating pads act as liquid absorbers and retainers, releasing electrolyte from the pores of the insulating pads after electrolyte consumption within the lithium battery, effectively alleviating the problem of electrolyte loss during lithium-ion battery cycling. This effectively improves the battery's cycle life.

Description

Cylindrical lithium-ion battery with liquid-retaining and vibration-resistant structure

technical field

The utility model relates to a cylindrical lithium-ion battery with a liquid-retaining and shock-resistant structure, which belongs to the field of batteries.

Background technique

Lithium-ion batteries are widely used in communication, lighting, energy storage, electric vehicles, electric bicycles, electric tools and other fields. With the continuous development of lithium-ion batteries and the development of application fields, the requirements for batteries in the field of high-current discharge are getting higher and higher. According to the shape and structure, it is divided into cylindrical steel case battery, pouch battery, square aluminum case battery and so on. Among them, the ordinary positive and negative insulating gaskets of cylindrical batteries only play an insulating role, and the cycle life of the battery decays rapidly due to the consumption of electrolyte in the middle and late stages of its service life. Used as a car battery, it is often affected by the vibration environment. Therefore, in order to improve environmental adaptability and electrolyte consumption, it is necessary to improve the battery structure.

Contents of the invention

The invention provides a cylindrical lithium ion battery with liquid retention and anti-vibration structure, which solves the problems of liquid retention and vibration of the cylindrical lithium battery.

For realizing above-mentioned object, the technical scheme that the utility model adopts is:

A cylindrical lithium-ion battery with a liquid-retaining and anti-vibration structure, including a positive electrode, a separator, and a negative electrode that are wound at intervals. The battery is set in a cylindrical steel shell, and the gap between the battery and the steel shell is filled. Electrolyte, the upper end and the lower end of the battery core in the steel shell are respectively provided with porous insulating gaskets, and the center of the porous insulating gaskets is provided with a central hole.

Among them, the porosity of the porous insulating gasket is 40-80%.

The material of the porous insulating gasket is one of porous polyethylene, polypropylene, polyphenylene sulfide or polyethylene terephthalate resin. The porous insulating gasket is made of porous polyethylene.

The electrolyte is an organic solution of lithium hexafluorophosphate. The positive end of the steel shell is provided with a cap for sealing, and the edge edge of a circular side of the porous insulating gasket and the peripheral surface is provided with a removed part to form a curved surface that is in close contact with the inside of the steel shell.

The beneficial technical effect of the utility model is:

1. The porous insulating gasket plays the role of absorbing and retaining liquid, and can release the electrolyte in the pores of the insulating gasket after the electrolyte is consumed inside the lithium battery, which can effectively alleviate the loss of electrolyte in the lithium-ion battery during the cycle. The effective improvement of the battery is the cycle life.

2. The porous insulating gasket has a certain elasticity due to its porous structure and the porous insulating gasket plays a protective role on the battery cell at both ends of the battery cell, especially when the battery cell is subjected to vibration, it plays a better buffering role.

Description of drawings

Fig. 1 is a partial sectional view of the utility model,

Figure 2 is a partial enlarged view 1 in Figure 1,

Fig. 3 is a partial enlarged view 2 in Fig. 1,

Fig. 4 is the top view of the insulating spacer of the present utility model,

Fig. 5 is a cross-sectional view of the insulating gasket of the present invention.

Reference signs: 1 steel shell 2 cap 3 porous insulating gasket 4 positive electrode sheet 5 diaphragm 6 negative electrode sheet 7 electrolyte solution 8 central hole 9 curved surface.

detailed description

As shown in Figure 1, the utility model is a cylindrical lithium-ion battery with a liquid-retaining and anti-vibration structure, including a positive electrode piece 4, a diaphragm 5, and a negative electrode piece 6. Among them, the gap between the cell and the steel shell is filled with electrolyte 7, and the upper and lower ends of the cell in the steel shell 1 are respectively provided with porous insulating gaskets 3, and the center of the porous insulating gasket 3 is provided with a central hole 8 .

The porosity of the porous insulating gasket 3 is 40-80%. The material of the porous insulating gasket 3 is one of porous polyethylene, polypropylene, polyphenylene sulfide or polyethylene terephthalate resin.

The porous insulating gasket 3 is made of porous polyethylene. The electrolyte solution 7 is an organic solution of lithium hexafluorophosphate, which does not react with the porous insulating gasket 3 . .

The positive end of the steel shell 1 is provided with a cap 2 for sealing. A circular side surface of the porous insulating gasket 3 is connected to the peripheral surface by removing a part on the edge edge to form a curved surface 9 which is in close contact with the inside of the steel shell.

The porous structure in the porous insulating gasket can absorb 0.7~1g more electrolyte and store it in the pores of the insulating gasket. When the electrolyte in the battery is consumed during the cycle, the electrolyte in the porous insulating gasket will enter the cell In the space between the lithium battery and the steel shell, the amount of electrolyte is replenished, and the electrolyte retained by the porous insulating gasket can increase the discharge times of the lithium battery and contribute to the improvement of cycle performance. The cycle life of the battery is increased from 2000 to 2500 times.

The porous insulating pad itself has good elasticity. When the cell vibrates inside the battery, the porous insulating pad can buffer the vibration of the cell, absorb the vibration potential energy of the cell, and avoid damage to the cell due to large amplitude.

Claims (7)

1. a kind of with the cylindrical lithium ion battery for protecting liquid and vibration proof structure, including positive plate（4）, barrier film（5）And negative plate（6） The battery core being wound into is spaced apart, battery core is arranged in cylindrical steel shell (1), the gap between battery core and box hat is full of electrolyte (7), it is characterized in that, top and bottom of the battery core in box hat (1) are respectively equipped with porous insulation pad (3), porous insulation The center of pad (3) is provided with centre bore (8).

2. according to claim 1 with the cylindrical lithium ion battery for protecting liquid and vibration proof structure, it is characterized in that, it is described porous The porosity of insulation spacer (3) is 40 ~ 80%.

3. according to claim 1 and 2 with the cylindrical lithium ion battery for protecting liquid and vibration proof structure, it is characterized in that, it is porous Insulation spacer (3) material is in porous shaped polyethylene, polypropylene, polyphenylene sulfide or pet resin Kind.

4. according to claim 3 with the cylindrical lithium ion battery for protecting liquid and vibration proof structure, it is characterized in that, porous insulation Pad (3) material is porous shaped polyethylene.

5. according to claim 1 with the cylindrical lithium ion battery for protecting liquid and vibration proof structure, it is characterized in that, electrolyte (7) it is the organic solution of lithium hexafluoro phosphate.

6. according to claim 4 with the cylindrical lithium ion battery for protecting liquid and vibration proof structure, it is characterized in that, box hat (1) Positive terminal be provided with block (2) sealing.

7. according to claim 1 with the cylindrical lithium ion battery for protecting liquid and vibration proof structure, it is characterized in that, porous insulation One round sides of pad (3) form tight inside curved surface (9) and box hat after setting removal part with the edge rib of side face cohesive position Contiguity is touched.