Battery Electrode Bonding Structure Against Separator Shrinkage
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Solution Overview
Problem
Secondary batteries face voltage-drop-induced failures due to separator shrinkage during drops, which current solutions inadequately address, affecting energy density and lifespan.
Innovation Solution
The battery design incorporates specific bonding parts to obstruct electrolyte impact on separators at prone areas, preventing shrinkage and abrasion, thereby enhancing safety and maintaining energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the amount of electrolytic solution is reduced to suppress separator shrinkage, then the safety against voltage-drop-induced failure is improved, but the energy density and lifespan of the battery deteriorate
Solution Approach 1:
The battery is divided into a body portion containing the electrode assembly and an accommodation cavity containing the electrolytic solution. This segmentation allows the electrolytic solution to be separated into bound electrolyte (in the body portion) and free electrolyte (in the accommodation cavity), enabling independent optimization of each region's function.
Solution Approach 2:
The separator acts as an intermediary structure between the electrode plates. By optimizing the separator's properties (porosity, thickness, material composition), it can regulate the interaction between electrolytic solution and electrode plates, preventing excessive electrolyte retention while maintaining adequate infiltration for battery performance.
2Reliability
If the amount of electrolytic solution is reduced to suppress separator shrinkage, then the safety against voltage-drop-induced failure is improved, but the lifespan of the battery deteriorates
Solution Approach 1:
The battery is divided into a body portion containing the electrode assembly and an accommodation cavity containing the electrolytic solution. This segmentation allows the electrolytic solution to be separated into bound electrolyte (in the body portion) and free electrolyte (in the accommodation cavity), enabling independent optimization of each region's function.
Solution Approach 2:
The separator acts as an intermediary structure between the electrode plates. By optimizing the separator's properties (porosity, thickness, material composition), it can regulate the interaction between electrolytic solution and electrode plates, preventing excessive electrolyte retention while maintaining adequate infiltration for battery performance.
3Reliability
If adhesive tape is wound around the electrode assembly to protect against separator shrinkage, then the local protection effect is achieved, but the overall improvement is limited due to incomplete coverage
Solution Approach 1:
The battery is divided into a body portion containing the electrode assembly and an accommodation cavity containing the electrolytic solution. This segmentation allows the electrolytic solution to be separated into bound electrolyte (in the body portion) and free electrolyte (in the accommodation cavity), enabling independent optimization of each region's function.
Solution Approach 2:
Different regions of the battery are given different properties: the body portion contains the electrode assembly with specific structural characteristics, while the accommodation cavity contains the electrolytic solution with different concentration or volume characteristics. This local differentiation optimizes both protection and performance.
Data Source
AI summary
A battery includes a housing, an electrode assembly, a first bonding part, and a second bonding part. The electrode assembly includes a body portion and a first metal portion. The first metal portion protrudes from the body portion along a first direction. The body portion includes a first protruding portion, a first portion, and a second protruding portion that are connected in sequence. The first portion includes a first surface and a second surface disposed opposite to each other in the second direction. The first protruding portion includes a third surface located on a same side as the first surface and a fourth surface disposed opposite to the third surface. The second protruding portion includes a fifth surface located on the same side as the first surface and a sixth surface disposed opposite to the fifth surface. The first protruding portion includes a seventh surface in the first direction.