Battery Insulating Member Geometry for Electrode Expansion Buffering
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Solution Overview
Problem
The expansion of the electrode assembly in secondary batteries can cause deformation of the lower insulating member, which squeezes the explosion-proof valve, affecting its preset burst pressure and posing safety hazards.
Innovation Solution
A secondary battery design featuring a lower insulating member with a concave portion containing inclined surfaces that buffer the expansion of the electrode assembly, preventing deformation and maintaining the explosion-proof valve's preset bursting pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the lower insulating member is made rigid to prevent deformation, then structural stability is improved, but it cannot buffer electrode assembly expansion, causing safety hazards
Solution Approach 1:
The lower insulating member incorporates a concave portion with curved surfaces that can elastically deform to buffer electrode assembly expansion. This curvature design allows the structure to absorb expansion forces while maintaining overall stability, preventing the rigid deformation issues while ensuring safety through controlled elastic deformation.
2Reliability
If the lower insulating member is made flexible to buffer expansion, then safety is improved, but structural stability deteriorates
Solution Approach 1:
The lower insulating member features a localized concave portion with specific geometric parameters (depth, width, curvature radius) that provides flexible buffering capacity exactly where electrode expansion occurs. The rest of the insulating member maintains rigid structural stability, achieving a balance between local flexibility for safety and overall structural integrity.
3Reliability
If the concave portion depth is increased to buffer expansion, then expansion buffering capacity is improved, but the explosion-proof valve may be affected
Solution Approach 1:
The concave portion is designed with optimized geometric parameters including depth, width, and curvature radius that are carefully selected to provide sufficient expansion buffering capacity while maintaining appropriate clearance from the explosion-proof valve. These parameter adjustments ensure the concave portion absorbs expansion forces without interfering with valve positioning or function.
Data Source
AI summary
This disclosure provides a secondary battery, including: a case including an opening; an electrode assembly disposed within the case and including a main body and two tabs, the two tabs being both disposed facing the case; and a cap assembly including a cap plate, a lower insulating member and an explosion-proof valve, the cap plate sealing the opening, the explosion-proof valve being disposed on the cap plate, the lower insulating member being disposed on a side of the cap plate close to the electrode assembly, the lower insulating member including an inner side surface facing the main body, an outer side surface facing the cap plate, and a concave portion recessed from the inner side surface toward the outer side surface, the concave portion being in position corresponding to the explosion-proof valve, and the concave portion being used to buffer expansion and deformation of the main body.