Battery Cover Plate Scores for Sequential Gas Pressure Relief
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Solution Overview
Problem
Existing battery explosion-proof structures burst, causing combustible and combustion-supporting gases to interact, exacerbating thermal runaway and leading to explosions.
Innovation Solution
A battery explosion-proof structure with a cover plate featuring a first score and a second score, where the thickness at the first score is less than at the second score, allowing for a directional burst that sequentially releases combustible and combustion-supporting gases, preventing interaction and explosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single explosion-proof film is used on the cover plate, then the structure is simple, but combustible gases and combustion-supporting gases interact causing battery explosion
Solution Approach 1:
The single explosion-proof film is divided into multiple explosion-proof films (first and second explosion-proof films) with different burst pressures. The first explosion-proof film bursts at lower pressure to release combustible gases, while the second bursts at higher pressure to release combustion-supporting gases. This segmentation prevents gas interaction and battery explosion while maintaining structural reliability.
Solution Approach 2:
The explosion-proof films are pre-installed on the cover plate with predetermined burst pressure characteristics. The first explosion-proof film is designed to burst before the second, creating a staged pressure relief system. This preliminary arrangement ensures that when internal pressure builds up, gases are released in a controlled sequence without requiring active control mechanisms.
2Reliability
If the cover plate thickness is uniform, then manufacturing is simple, but directional burst control is difficult
Solution Approach 1:
The cover plate transitions from uniform thickness to non-uniform thickness, with different thickness regions positioned at specific locations. The first region has a first thickness and the second region has a second thickness, creating localized structural differences. This enables the first explosion-proof film to burst in a predetermined direction first, followed by the second, providing reliable burst direction control.
Solution Approach 2:
The cover plate employs asymmetric thickness distribution rather than symmetric uniform thickness. The first and second regions have different thickness values, creating an asymmetric structure that guides the burst sequence and direction. This asymmetry ensures controlled pressure relief while remaining manufacturable through standard forming processes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The structure effectively time-shares the discharge of combustible and combustion-supporting gases, reducing the risk of thermal runaway and ensuring reliable pressure relief.
Implementation Method 1
When internal pressure of the battery increases, the first score on the cover plate bursts first, and the second score on the cover plate bursts again to form a secondary pressure relief of the battery
Data Source
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AI summary
A battery explosion-proof structure, a battery, and a battery pack are provided. The battery explosion-proof structure includes a cover plate (110) provided with a first score (111) and a second score (112). A thickness of the cover plate (110) at the first score (111) is less than a thickness of the cover plate (110) at the second score (112). The first score (111) includes a first segment (1111) and a second segment (1112) connected together. The first segment (1111) includes a first end (1113) and a second end (1114). The second segment (1112) includes a third end (1115) and a fourth end (1116). A distance between the first end (1113) and the third end (1115) is greater than a distance between the second end (1114) and the fourth end (1116).