Battery Cell End Cap Vent Structure Against Premature Opening
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Solution Overview
Problem
Inverted battery cells often experience premature opening of the pressure relief structure due to external impacts, leading to failure in implementing a normal pressure relief function, which compromises the safety and integrity of the battery.
Innovation Solution
The end cap features a pressure relief portion bent in the thickness direction, with an arc surface configuration and protrusions to absorb external impacts, preventing damage and ensuring the pressure relief groove remains closed until the internal pressure reaches the initiation pressure, thus maintaining the normal pressure relief function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure relief structure is made sensitive to internal pressure, then the pressure relief function is improved, but the structure becomes prone to premature opening due to external impacts
Solution Approach 1:
The patent applies beforehand cushioning by designing the pressure relief portion with a bent configuration that can deform to absorb external impact energy before the pressure relief groove opens. The bent structure acts as a cushion that prevents premature opening due to external impacts while still allowing opening when internal pressure reaches the initiation pressure, thus resolving the contradiction between sensitivity to internal pressure and susceptibility to external impacts.
2Object-affected harmful factors
If the pressure relief portion is made deformable to absorb impact, then the resistance to external impact is improved, but the structural strength may be reduced
Solution Approach 1:
The patent applies local quality by making only the pressure relief portion bent and deformable, while the rest of the end cap maintains its structural strength. The bent configuration is localized to the pressure relief portion, allowing it to deform and absorb impact energy without compromising the overall structural integrity of the end cap. This resolves the contradiction between impact resistance and structural strength.
3Reliability
If the pressure relief groove is kept closed to maintain safety, then the safety is improved, but the pressure relief function cannot be activated when needed
Solution Approach 1:
The patent applies parameter changes by designing the bent pressure relief portion to deform under specific conditions (when internal pressure reaches the initiation pressure). The deformation of the bent structure changes the physical state from closed to open, allowing the pressure relief groove to activate only when the internal pressure parameter reaches the critical threshold. This resolves the contradiction between maintaining safety (closed state) and enabling pressure relief function (open state) when needed.
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 solution effectively reduces the impact of external forces on the pressure relief groove, ensuring it remains functional only when necessary, thereby ensuring the battery's safety and operational integrity by preventing premature opening and maintaining effective pressure relief.
Implementation Method 1
the pressure relief portion is bent in a thickness direction of the cap body. since the pressure relief portion of the end cap is bent in the thickness direction of the cap body, when the end cap is subjected to an external impact, the pressure relief portion may deform in a bending direction, and thus absorb energy of the external impact
Implementation Method 2
the first surface is an arc surface. the first surface is configured as an arc surface, so that the first surface is prone to deformation when subjected to an external impact, so as to absorb energy of the external impact
Data Source
AI summary
An end cap may comprise a cap body and a pressure relief groove. The cap body may be provided with a pressure relief portion, wherein the pressure relief groove may be formed in the cap body, and the pressure relief groove may delimit the pressure relief portion. The pressure relief portion may be bent in a thickness direction of the cap body.