Aluminium-casing lithium ion cell core with antiexplosion film

A technology of lithium ion and explosion-proof membrane, which is applied in the direction of circuits, electrical components, secondary batteries, etc., can solve the problems of large investment in fixed assets, high equipment requirements, and high production costs, and achieves good consistency in mass production and low impact on battery weight. The effect of small opening pressure and high precision

Inactive Publication Date: 2008-05-28
TIANJIN DG MEMBRANE
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Problems solved by technology

[0007] There are two disadvantages in the method of punching and scoring: one is that it is not easy to achieve low pressure, and the other is that the opening pressure is low in precision, and it cannot be broken in time and accurately, and there will still be potential defects of fire and explosion
This product is produced by vacuum finish rolling / vacuum sputtering / cold pressure welding, which requires high equipment requirements, large investment in fixed assets, and high production costs.

Method used

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  • Aluminium-casing lithium ion cell core with antiexplosion film

Examples

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Embodiment Construction

[0016] For the ICP183665AR type aluminum shell lithium-ion battery, adopt the structure shown in the attached figure, firstly manufacture the stainless steel hollow rivet, punch out the explosion-proof hole with a diameter of 4mm on the flat bottom of the rivet, and vacuum-braze the rolled red copper with a thickness of 12 microns on the edge of the hole Foil 6, using NBi-2 amorphous solder, the rivet rod after brazing is placed in sequence with sealing insulating gasket 2, large aluminum cover plate 3, sealing insulating gasket 4, metal pressure plate 5, and then riveted, the riveted cover plate After the tight fit with the aluminum shell, laser welding is used to seal it, and then subsequent processes such as vacuum drying, electrolyte injection, and chemical formation are carried out to manufacture 183665 aluminum shell lithium-ion batteries with explosion-proof membranes.

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Abstract

When pressure inside electric core rises abnormally, increased inner pressure makes rupture membrane on steel rivet of negative pole turn to open in order to release pressure. The rupture membrane including a flat base and hollow column part is in steel rivet of aluminum cover plate. There are rupture pressure relief holes inside hollow column part, and rupture membrane is connected to periphery of the rupture pressure relief holes. Advantages are: compact structure, low pressure to turn to open of explosion valve, high precision and low cost.

Description

technical field [0001] The invention relates to lithium-ion batteries, in particular to aluminum-shell lithium-ion batteries. Background technique [0002] Liquid lithium-ion batteries use liquid organic electrolytes, which have high energy density and high working voltage. Due to the superior performance of batteries, they are more and more used in various portable electronic devices. In recent years, aluminum shell lithium-ion Because the battery cell is lighter than the traditional stainless steel lithium-ion battery cell, it occupies more and more markets in the lithium-ion battery market. [0003] When lithium-ion batteries are in use, in order to prevent fire and explosion, when all other protection measures fail, they rely on PTC and safety valves, and safety valves are the last protection, so the quality of safety valves is crucial to the safety of batteries. Important, especially for high-capacity lithium-ion batteries that can kill people, the role of the safety v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/12H01M10/40H01M50/30
CPCY02E60/122Y02E60/10
Inventor 李鑫
Owner TIANJIN DG MEMBRANE
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