Secondary Battery Shock Absorbing Portion Protects Vent
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Solution Overview
Problem
Conventional lithium secondary battery vents are prone to damage from external shocks due to their thin openings, which can lead to compromised battery reliability by allowing internal gas pressure to rupture the vent instead of other parts of the can or cap assembly.
Innovation Solution
A shock absorbing portion is formed proximal to the vent on the wider side of the can, with a thickness between that of the can and the vent opening, to absorb external impacts and prevent damage to the vent opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vent opening is made thin to enable preferential rupture for gas discharge, then the vent can effectively release internal pressure, but the vent becomes vulnerable to damage from external shocks
Solution Approach 1:
A shock absorbing portion is formed on the can at a position adjacent to the vent opening. This portion has a thickness greater than that of the vent opening and is configured to absorb external shocks before they reach the vent, thereby protecting the thin vent opening from damage while allowing it to rupture preferentially under internal pressure
Solution Approach 2:
The can structure is modified locally by adding a shock absorbing portion with different thickness characteristics at a specific location near the vent. This creates a localized protective zone without affecting the overall thinness of the vent opening, allowing the vent to maintain its preferential rupture property while gaining shock resistance
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 shock absorbing portion effectively reduces the risk of vent damage from external shocks, maintaining the battery's physical integrity while allowing the vent to function in releasing internal gas pressure, thereby enhancing the battery's shock resistance and reliability.
Implementation Method 1
a shock absorbing portion, which has the thickness between that of the can and that of the opening, is formed proximal to the vent
Data Source
AI summary
A secondary battery includes an electrode assembly, a can receiving the electrode assembly, and a cap assembly coupled to the open upper part of the can. In addition, a vent including an opening, which is thinner than the can is formed on a wide side of the can, and a shock absorbing portion, which is thinner than the can and thicker than the opening, is formed near the vent. Accordingly, the vent can be protected from damage from external shocks, which are absorbed by the shock absorbing portion.