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Method for capping lithium ion battery

A technology of lithium-ion batteries and memory alloys, applied in secondary batteries, battery pack components, circuits, etc., can solve the problems of high cost of laser welding equipment, high flatness requirements, and increased cost burden, and achieve low cost , good safety and low failure rate

Inactive Publication Date: 2006-12-20
HONG FU JIN PRECISION IND (SHENZHEN) CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of laser welding technology can make the cover of the battery achieve good sealing. However, the equipment cost of laser welding technology is expensive, and it will increase the cost burden if it is widely used in industry, and the operation is dangerous. Flatness requirements are very high, and the failure rate of capping is also high

Method used

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  • Method for capping lithium ion battery
  • Method for capping lithium ion battery
  • Method for capping lithium ion battery

Examples

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Embodiment Construction

[0023] The production process of general batteries: First, the electrodes, including positive and negative materials and separators, are wound together and put into the tank body, then the tank body and the upper cover are sealed and welded, and then the electrolyte is injected, and the liquid injection port is closed. Sealing, the liquid injection port is usually sealed by spot welding, or the liquid injection hole is directly blocked by a small steel ball, that is, the entire preparation process is completed.

[0024] The present invention is to improve the process of sealing and welding the tank body and the upper cover. The battery sealing method of the present invention is to use the shape memory alloy gasket to induce phase deformation under the applied pressure, and to maintain the pressure and heat to Austrian. Above the astenite termination temperature (Af), it restores the parent phase with a body-centered cubic structure in a limited space, thereby generating a retra...

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Abstract

The invention relates to a lithium ion battery capping method, including the following steps: providing a cylinder and a top cap; providing a shape memory alloy washer, arranged between the cylinder and the top cap; applying a proper opposite pressure on the cylinder and the top cap to tightly press the said washer and causing phase vibration and shape vibration of the said washer to make a mother phase with central cubic structure form Martensite phase-varying state; keeping this pressure, and heating to above Austenite Final (Af) phase terminating temperature to make the wafer return to the mother phase, and thus the washer generates internal shrinking force to seal the cylinder and top cover and then removes the said pressure. The invention has the advantages of good safety, high sealing degree, low failure ratio, etc.

Description

【Technical field】 [0001] The invention relates to a method for sealing a secondary battery, in particular to a method for sealing a lithium ion battery. 【Background technique】 [0002] In recent years, computers, communication electronic products, and consumer electronic products have become more and more powerful, and their dimensions have become smaller and lighter, so high-capacity, small-size secondary battery products are popular. Lithium-ion batteries, in particular, have the characteristics of large capacity, high energy density, and high voltage, and their market share in mobile phones, notebook computers, digital cameras and other products continues to rise. [0003] Lithium-ion batteries are based on lithium cobalt oxide (LiCoO 2 ), lithium nickel oxide (LiNiO 2 ) or lithium manganese oxide (LiMn 2 o 4 ) and the like are positive electrode active materials, and lithium metal, lithium alloys or carbon materials are used as negative electrode active materials. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M2/00H01M10/38H01M10/40H01M50/166
CPCY02E60/122Y02E60/10Y02P70/50
Inventor 翁维襄
Owner HONG FU JIN PRECISION IND (SHENZHEN) CO LTD
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