Battery Pouch Corner Projections for Wrinkle Suppression
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Solution Overview
Problem
Existing battery designs with laminate film encasements often experience wrinkles and damage at corner portions, leading to performance deterioration and potential cracks during heat cycles.
Innovation Solution
A battery design featuring a quadrilateral electrode body enclosed in a pouch-shaped outer encasement member with recessed portions and projections at the corners, which form hollows between the joint and electrode body, reducing stress concentration and material excess that causes wrinkles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the outer encasement member is tightly sealed around the electrode body, then sealing performance is improved, but stress concentration at corner portions causes wrinkles and damage
Solution Approach 1:
The patent introduces projections with hollows at the corner portions of the outer encasement member. These local structural modifications create space that accommodates the electrode body corners, preventing stress concentration and wrinkle formation while maintaining the overall tight sealing of the encasement member.
Solution Approach 2:
The projections form hollows that act as cushioning spaces before the electrode body is inserted. These pre-formed hollows absorb the excess material and stress that would otherwise cause wrinkles and damage at the corner portions during the sealing process, thereby protecting the laminate film integrity.
2Weight of moving object
If the laminate film is made thinner to reduce battery weight, then weight is reduced, but the film becomes more susceptible to wrinkles and damage at corner portions
Solution Approach 1:
The projections are strategically placed at the corner portions where stress concentration and wrinkle formation are most likely to occur. This localized reinforcement through hollow formation provides additional structural support at critical points, allowing the use of thinner laminate film material overall while maintaining sufficient strength and wrinkle resistance at the vulnerable corner areas.
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
A battery (10) includes an outer encasement member (11) configured to accommodate an electrode body (14) that is quadrilateral in plan view. The outer encasement member (11) has a recessed portion (12a) that is quadrilateral in plan view and configured to accommodate the electrode body (14), and is provided with a joint portion (11a) at an outer peripheral end portion. A corner portion of the recessed portion (12a) is provided with a projection (15) extending toward the joint portion (11a).