Soft-Packed Battery Anti-Explosion Package Design
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Solution Overview
Problem
Soft-packed Li-ion batteries are prone to explosion due to inadequate heat dissipation and leakage caused by poor leakproofness in existing anti-explosion packages, where the packaging gap intensity is not guaranteed to fail at the gap area, and electrolyte corrosion leads to battery leakage.
Innovation Solution
An anti-explosion package design featuring an upper and lower film with a packaging area and an anti-explosion area, including an opening and transition area, where the anti-explosion area is arranged to create a weak point for heat dissipation and the transition area ensures low intensity adhesion to prevent pressure buildup and leakage, guiding gas and electrolyte ejection from the packaging area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a packaging gap is formed in the packaging area to dissipate heat, then heat dissipation is improved, but the packaging intensity is weakened and breakage may not occur at the packaging area
Solution Approach 1:
The packaging area is divided into distinct zones with different adhesion intensities: the first area has strong adhesion between upper and lower films, the second area has reduced adhesion to serve as a breakage initiation zone, and the third area has no adhesion to form the heat dissipation gap. This local differentiation allows the packaging to maintain overall strength while creating a controlled weak point for heat release.
2Temperature
If the gap (un-packaged area) is made large to improve heat dissipation, then heat dissipation is improved, but the packaging area becomes narrow and leakproofness deteriorates
Solution Approach 1:
The packaging structure implements spatially varying adhesion characteristics where the first area provides strong sealing for leakproofness, the second area provides controlled weakness for breakage, and the third area provides open gap for heat dissipation. This local quality differentiation allows the package to simultaneously achieve leakproofness and heat dissipation.
3Temperature
If the packaging area is made narrow to accommodate a large gap, then heat dissipation is improved, but the packaging strength is reduced
Solution Approach 1:
The packaging area is segmented into three functional zones along the edge of the hollow cavity: a first area with strong adhesion for structural strength, a second area with reduced adhesion for controlled breakage, and a third area with no adhesion for heat dissipation. This segmentation allows each zone to perform its specific function while contributing to the overall packaging performance.
Data Source
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AI summary
The present application relates to the field of Li-ion battery manufacturing technologies and, in particular, to an anti-explosion package of a soft-packed secondary battery, including: an upper film, a lower film, a packaging area and an anti-explosion area, an outer edge of the upper film and an outer edge of the lower film are sealed with each other, which forms a hollow cavity for accommodating a naked battery core; a packaging area with a certain width is provided on at least one outer edge of the upper film and the lower film, the anti-explosion area is arranged in the packaging area, all the packaging areas of the upper film and the lower film are adhered together except the location of the anti-explosion area, so that the upper film and the lower film are sealed at this side, the anti-explosion area includes an opening area and a transition area, which are successively arranged in a direction from an edge of the packaging area close to the hollow cavity to an edge away from the hollow cavity; the portion located at the opening area of the upper film and the lower film is not adhered, the portion located at the transition area of the upper film and the lower film is adhered with an intensity less than that of the transition area. The anti-explosion package of a soft-packed secondary battery of the present application, on one hand, can prevent the battery explosion, on the other hand, can prevent the leakage caused by the poor leakproofness of the battery.