Battery Spacer Rib Structure for Controlled Injection-Time Deformation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The deformation of spacers in nonaqueous electrolytic solution secondary batteries occurs during the liquid injection step due to the weight of the electrode body, particularly when the spacer is positioned downward in the gravity direction.
Innovation Solution
The secondary battery design includes a spacer with a second wall part having a lower load-bearing capacity than the first wall part, featuring a rib to reinforce the second wall part, which acts as the starting point of deformation, thereby controlling and suppressing spacer deformation during the liquid injection process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the spacer is arranged at the downward position to support the electrode body during liquid injection, then the electrode body is supported, but the spacer deforms under the weight of the electrode body
Solution Approach 1:
The spacer is designed with non-uniform wall thickness where the first wall parts have greater thickness and higher load-bearing capacity, while the second wall parts have lesser thickness and lower load-bearing capacity. This local quality differentiation allows the spacer to concentrate deformation in specific regions (second wall parts) while maintaining structural integrity in critical areas (first wall parts), thus resolving the contradiction between providing support and preventing deformation.
Solution Approach 2:
The invention accepts that deformation will occur under load but directs it to occur in predetermined, less critical regions (second wall parts with lower load-bearing capacity). By converting the harmful effect of deformation into a controlled, localized phenomenon, the overall structural integrity and support function are preserved while accommodating the necessary deformation.
2Strength
If the spacer structure is reinforced to prevent deformation, then structural integrity is improved, but the deformation control capability is reduced
Solution Approach 1:
The spacer employs differentiated wall thicknesses in different regions: first wall parts with greater thickness for high strength and structural integrity, and second wall parts with lesser thickness for controlled deformation. This local quality approach allows simultaneous achievement of both strong overall structure and precise deformation control in specific areas.
Solution Approach 2:
The spacer is segmented into different wall parts (first wall parts and second wall parts) with distinct structural characteristics. This segmentation allows each part to perform its specialized function: first wall parts provide structural strength while second wall parts facilitate controlled deformation, thereby resolving the contradiction between strength and deformation control.
Data Source
AI summary
A herein disclosed secondary battery includes a case main body, a second sealing plate, and an electrode body. Then, a second spacer supporting the electrode body from a downward position at an injection time of an electrolytic solution is arranged between the second sealing plate and the electrode body. The second spacer includes a pair of first wall parts and a pair of second wall parts. Then, the second spacer is configured to make a load bearing capacity of the second wall part be lower than a load bearing capacity of the first wall part. Then, this second spacer includes a rib configured to bridge the pair of second wall parts. By doing this, it is possible to suppress the deformation of the second spacer.