Method for preventing lithium ion battery corner from being damaged during flexible package

A lithium-ion battery and flexible packaging technology, applied in the field of lithium-ion batteries, can solve problems such as aluminum layer fatigue, electrolyte leakage, battery inflation, etc.

Active Publication Date: 2012-10-03
NINGDE AMPEREX TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the area where the air bag area and the battery cell meet is the support point for bending, there is a stress concentration. After bending many times, it is easy to cause fatigue of the aluminum layer and cause cracks an

Method used

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  • Method for preventing lithium ion battery corner from being damaged during flexible package
  • Method for preventing lithium ion battery corner from being damaged during flexible package
  • Method for preventing lithium ion battery corner from being damaged during flexible package

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Embodiment Construction

[0024] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but the embodiments of the present invention are not limited thereto.

[0025] The method for preventing the corner damage of the soft-pack lithium-ion battery of the present invention comprises the following steps:

[0026] The first step is to perform corner pre-packaging treatment at the corner of the junction of the air bag 21 and the battery cell 1 to form a corner pre-package area 22, and obtain a lithium-ion battery with the air bag 21 and the corner pre-package area 22, Such as figure 1 As shown, the corner pre-packaging process is processed by a jig 3 . The specific packaging parameters can be adjusted according to the packaging bag 2 used. The purpose of this step is to pre-package an arc-shaped edge at the corner to prevent sharp corners and cause stress concentration.

[0027] In the second step, the air bag bottom packagi...

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PUM

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Abstract

The invention belongs to the technical field of lithium ion batteries and in particular relates to a method for preventing a lithium ion battery corner from being damaged during flexible package. The method includes performing corner prepackaging process at a corner where an air bag intersects with a cell to form a corner prepackaging area; performing air bag bottom packaging process on the air bag on the right side of the corner prepackaging area to form an air bag bottom packaging area; and setting a shear angle in the air bag bottom packaging area. Compared with the prior art, a stress concentration area can be produced artificially through angle shearing at the position far from the corner on the air bag, the air bag is bent firstly in the stress concentration area when the air bag needs to be bent during a production process of cell post-treatment, therefore corner damage in the intersection area of the air bag with the cell is avoided, and possibility of the corner damage is reduced.

Description

technical field [0001] The invention belongs to the technical field of lithium-ion batteries, and in particular relates to a method for preventing corner damage of soft-packaged lithium-ion batteries. Background technique [0002] A lithium-ion battery is a chemical energy storage device with high energy density, which includes a cathode, an anode, a separator between the cathode and the anode, an electrolyte, and a packaging bag. Among them, the electrolyte includes a non-aqueous organic solvent and lithium hexafluorophosphate (LiPF 6 ), lithium hexafluorophosphate easily generates HF and H when it meets water 2 Wait for gas. This reaction easily affects the composition and stability of the solid electrolyte (SEI) film, increases the impedance of the battery, and consumes too much Li + ions, resulting in a decrease in battery capacity. Therefore, during the preparation and use of lithium-ion batteries, water vapor must be prevented from entering the interior of the batt...

Claims

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Application Information

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IPC IPC(8): H01M10/058
CPCY02E60/12Y02E60/10Y02P70/50
Inventor 张磊张卫均张毅
Owner NINGDE AMPEREX TECH
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