Battery Case Reinforcement Structure for Swelling Resistance
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Solution Overview
Problem
Secondary batteries face challenges with swelling phenomena due to internal gas generation during charging and discharging, which can lead to reduced adhesion between the case and the electrode assembly, increased risk of short circuits, and compromised safety.
Innovation Solution
The implementation of a reinforcement unit on the outer side surface of the case, featuring recessed or protruding shapes such as cross-shaped, inverse L-letter, and L-letter protrusions, enhances the rigidity of the case and mitigates swelling by improving adhesion and reducing internal pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the case is made with standard structure, then manufacturing is simple, but rigidity is insufficient leading to swelling
Solution Approach 1:
The reinforcement unit is divided into multiple discrete protrusions arranged in specific patterns (cross-shaped, X-letter shaped, or multiple individual protrusions). Each protrusion acts as an independent structural element that collectively enhances the overall rigidity of the case without requiring a complete structural redesign.
Solution Approach 2:
Reinforcement protrusions are strategically positioned at specific locations on the case outer surface where structural support is most needed. The patterns (cross-shaped, X-letter shaped) concentrate reinforcement at critical areas while maintaining simplicity in other regions, achieving enhanced rigidity without uniform complexity throughout.
2Reliability
If reinforcement protrusions are added to enhance rigidity, then swelling is reduced, but manufacturing complexity increases
Solution Approach 1:
The reinforcement protrusions are integrated directly into the case structure during the molding process. The case and reinforcement units are formed as a single integrated component, eliminating the need for separate manufacturing steps or assembly operations to attach reinforcement elements.
Solution Approach 2:
The case structure serves dual functions: it provides the basic containment function while simultaneously incorporating reinforcement protrusions that enhance rigidity and prevent swelling. This multi-functional design eliminates the need for separate reinforcement components.
3Quantity of substance
If internal pressure increases during charging/discharging, then battery capacity increases, but case swelling occurs
Solution Approach 1:
The reinforcement protrusions are pre-formed on the case structure before the battery is assembled and before any charging/discharging cycles occur. These pre-formed structural elements provide resistance against the internal pressure that will later develop during battery operation, preventing swelling before it can occur.
Solution Approach 2:
The reinforcement protrusions act as pre-positioned structural cushions that absorb and distribute the stress from internal pressure buildup. By having these reinforcement elements in place beforehand, the case is prepared to withstand the pressure increases that occur during charging and discharging without deforming.
Data Source
AI summary
The present disclosure relates to a secondary battery having a case with reinforced rigidity. The secondary battery includes: an electrode assembly including a first electrode plate, a second electrode plate, and a separator; a case accommodating the electrode assembly; and a reinforcement unit having a recessed or protruding shape on the outer side surface of the case.