CN213401430U - Aluminum-shell cylindrical lithium ion battery with secondary sealing valve - Google Patents

Abstract

The utility model aims at providing a take cylindrical lithium ion battery of aluminum hull of secondary seal function. The utility model discloses a cylindrical lithium ion battery mainly comprises positive plate, negative pole piece, diaphragm, electrolyte, aluminium shell, insulating ring and the compound cap of aluminium, and the compound cap of aluminium mainly comprises aluminium upper cap, metal lower cap and explosion-proof valve, and explosion-proof valve has the secondary seal function.

Description

Aluminum-shell cylindrical lithium ion battery with secondary sealing valve

Technical Field

The utility model relates to a cylindrical lithium ion battery, especially a cylindrical lithium ion battery of aluminum hull.

Background

The lithium ion battery has the characteristics of high monomer voltage, high specific energy, high specific power and long service life. The lithium ion battery has the disadvantages of high cost and combustibility and explosiveness. The cylindrical lithium ion battery has the characteristics of high standardization degree and high production automation degree. In order to prevent the lithium ion battery from exploding, an explosion-proof valve is generally arranged on a shell of the lithium ion battery, and the explosion-proof valve of the cylindrical lithium ion battery is generally arranged in a cap of the battery. The lithium ion battery normally uses and does not generally generate gas, so once the high-pressure gas is generated inside the lithium ion battery, the lithium ion battery is damaged and can not be used continuously. Therefore, the explosion-proof valve of the lithium ion battery is generally disposable, and once the explosion-proof valve is opened and decompressed, the explosion-proof valve is not sealed. The secondary sealing explosion-proof valve suitable for the lithium ion battery is complex in mechanism and relatively high in cost, the cylindrical lithium ion battery is not adopted basically, and the explosion-proof valve of the cylindrical lithium ion battery is usually a metal film. When the cylindrical lithium ion battery is used as a power battery, the disposable explosion-proof valve presents great potential safety hazard. The power battery usually needs a plurality of cylindrical lithium ion batteries to be used in combination, when one of the cylindrical lithium ion batteries is opened due to some reason, the explosion-proof valve has no influence on other lithium ion batteries, and the power battery can be continuously used as a whole. The lithium ion battery with the explosion-proof valve opened is not sealed, and moisture in the air enters the lithium ion battery to react with the negative electrode of the lithium ion battery, so that spontaneous combustion of the lithium ion battery can be caused.

The invention of China authorizes CN201510286211.0 a cylindrical lithium ion battery with a secondary sealing valve to provide a solution for adding the secondary sealing valve, and can better solve the problem of spontaneous combustion of the lithium ion battery caused by rupture of a primary explosion-proof membrane. The conventional cylindrical lithium ion battery is a steel shell, the method adopting CN201510286211.0 is more applicable, if the cylindrical lithium ion battery adopts an aluminum shell for light weight, the composite cap becomes the cathode of the lithium ion battery, and the method adopting an aluminized rubber ball as an explosion-proof secondary sealing valve is not suitable.

Disclosure of Invention

The utility model aims at providing a take cylindrical lithium ion battery of aluminum hull of secondary seal function. The utility model discloses a cylindrical lithium ion battery mainly comprises positive plate, negative pole piece, diaphragm, electrolyte, aluminium shell, insulator ring and the compound cap of aluminium, and the confined space is constituteed to aluminium shell, insulator ring and the compound cap of aluminium, and positive and negative pole piece is separated the coiling shaping by the diaphragm, and positive plate, negative pole piece, diaphragm, electrolyte are all in the confined space of aluminium shell, insulator ring and the compound cap structure of aluminium. The aluminum composite cap mainly comprises an aluminum upper cap, a metal lower cap and an explosion-proof valve, and the explosion-proof valve has a secondary sealing function. The upper cap is an aluminum stamping part, and the lower cap is a copper, nickel-plated steel or stainless steel stamping part. The explosion-proof valve is a nickel-plated or copper-plated rubber ball. The upper cap and the lower cap can fix the explosion-proof valve in the middle through the crimping mechanical pressing of the lower cap to form a composite cap, and the upper cap and the lower cap can also fix the explosion-proof valve in the middle through the spot welding to form the composite cap. When the internal pressure of the aluminum-shell cylindrical lithium ion battery is overlarge, the sealing valve is opened, gas flows out from the pressure relief hole, and the internal pressure of the battery is reduced. When the internal pressure of the battery is lower than the opening pressure of the sealing valve, the sealing valve is closed, and the cylindrical lithium ion battery with the aluminum shell can be sealed secondarily.

Drawings

Fig. 1 is a schematic view of a nickel plated rubber ball composite cap.

Wherein, the pressure relief valve comprises 1-an upper cover, 2-a lower cover, 3-an explosion-proof valve, 4-a vent hole and 5-a pressure relief hole.

Detailed Description

Example one

The utility model discloses a cylindrical lithium ion battery of aluminum hull mainly comprises positive plate, negative pole piece, diaphragm, electrolyte, aluminum hull, insulator ring and compound cap, and aluminum hull, insulator ring and compound cap constitute confined space. The positive plate, the negative plate, the diaphragm and the electrolyte are all arranged in a sealed space constructed by the aluminum shell, the insulating ring and the composite cap cover. The positive plate is connected with the aluminum shell, the aluminum shell is the positive electrode of the lithium ion battery, the negative plate is connected with the composite cap, and the composite cap is the negative electrode of the lithium ion battery. The cap mainly comprises an upper cap, a lower cap and an explosion-proof valve, wherein the upper cap is an aluminum stamping part, the lower cap is a nickel-plated steel stamping part, and the explosion-proof valve is a nickel-plated rubber ball. The upper cap and the lower cap are pressed and fastened through the lower cap crimping machine, the rubber ball is clamped between the upper cap and the lower cap, and the upper cap, the lower cap and the rubber ball form a whole. The center of the lower cap 2 is provided with a pressure relief hole 5, a plurality of air holes 4 are distributed at the position deviating from the center of the upper cap 1, and the rubber ball extrudes the pressure relief hole of the lower cap to play a role in sealing. When the internal pressure of the cylindrical lithium ion battery with the aluminum shell is overlarge, the rubber ball is pressed and deformed, the sealing valve is opened, gas flows out of the pressure relief hole, and the internal pressure of the battery is reduced. When the internal pressure of the battery is lower than the opening pressure of the sealing valve, the sealing valve is closed, and the cylindrical lithium ion battery with the aluminum shell can be sealed secondarily.

Claims (1)

1. The utility model provides a cylindrical lithium ion battery of aluminum hull, mainly by positive plate, the negative pole piece, the diaphragm, electrolyte, the shell, the insulating ring and compound cap cover are constituteed, positive and negative pole piece is separated the coiling shaping by the diaphragm, positive plate, the negative pole piece, the diaphragm, electrolyte all are in the aluminum hull, the sealed space of insulating ring and compound cap cover structure, its characterized in that shell is the aluminum hull, the explosion-proof valve is the secondary seal explosion-proof valve, positive plate and aluminum hull are connected, the aluminum hull is the positive pole of lithium ion battery, the negative pole piece is connected with compound cap cover, compound cap cover is the negative pole of lithium ion battery, compound cap cover upper cap cover is the aluminium stamping workpiece, the lower cap cover is the copper stamping workpiece, the explosion-proof valve is copper.

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