Battery Insulating Plate Structure for Vent Burst Pressure Stability
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Solution Overview
Problem
Secondary batteries face safety hazards due to deformation of the lower insulating member, which can squeeze the explosion-proof valve, affecting its preset burst pressure during electrode assembly expansion.
Innovation Solution
A secondary battery design incorporating an insulating plate with a concave portion and shielding segment to buffer expansion, reducing deformation of the lower insulating member and maintaining the explosion-proof valve's preset burst pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electrode assembly expands during charging and discharging, then the battery capacity is improved, but the lower insulating member deforms and squeezes the explosion-proof valve, affecting its preset burst pressure
Solution Approach 1:
The patent introduces a concave portion in the lower insulating member that serves as a pre-designed buffer space. This concave portion is positioned to receive and accommodate the expansion of the electrode assembly before it can deform the insulating member and affect the explosion-proof valve. By providing this cushioning space in advance, the patent prevents the harmful deformation while allowing the electrode assembly to expand freely during charging and discharging cycles.
Solution Approach 2:
The concave portion acts as an intermediary element between the expanding electrode assembly and the lower insulating member. It provides a dedicated space that mediates the interaction between these two components, allowing the electrode assembly to expand into the concave portion without transmitting deformation forces to the lower insulating member and explosion-proof valve. This intermediary structure effectively decouples the expansion process from the potential harmful effects.
2Stability of the object's composition
If the lower insulating member is made more rigid to prevent deformation, then the structural stability is improved, but the expansion of the electrode assembly is restricted, reducing battery capacity
Solution Approach 1:
The patent segments the lower insulating member by introducing a concave portion, effectively dividing it into regions with different functional characteristics. The main body of the insulating member maintains its rigidity for structural stability, while the concave portion provides a compliant expansion space. This segmentation allows different parts of the same component to serve different functions - the flat portions provide structural support while the concave portion accommodates expansion.
Solution Approach 2:
The patent applies local quality by creating a concave portion with specific geometric characteristics in a localized area of the lower insulating member. This concave region has different mechanical properties compared to the rest of the insulating member - it is designed to be more compliant and accommodate deformation. The local modification allows the electrode assembly to expand in this specific region without affecting the overall structural stability of the insulating member.
Data Source
AI summary
This disclosure provides a secondary battery, including: a case; an electrode assembly disposed within the case and including a main body and two tabs; a cap assembly including a cap plate, a lower insulating member and an explosion-proof valve, 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 and including an inner side surface, an outer side surface, 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 an expansion amount of the main body; and an insulating plate located on a side of the lower insulating member close to the electrode assembly and including a shielding segment which at least partially shields the concave portion.