Vertically Stacked Battery Cell with Pipe Case for Swelling Restraint
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Solution Overview
Problem
Conventional lithium secondary batteries face issues with electrode swelling and electrolyte exhaustion, leading to reduced lifespan due to uneven pressure distribution and side reactions, which affects their performance and efficiency.
Innovation Solution
A vertically stacked battery cell structure where electrodes are aligned in a vertical direction with a corresponding pipe-shaped battery case, allowing for uniform pressure distribution and effective restraint of swelling, using silicon-based or manganese-based active materials and a laminate or polymer battery case for improved insulativity and shape flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrodes are stacked in conventional horizontal configuration, then battery structure is compact, but electrode swelling is uneven and performance deteriorates
Solution Approach 1:
The patent transitions from conventional horizontal electrode stacking to vertical stacking along the height direction. This dimensional change allows the electrode stack to be constrained by the battery case in a manner that provides uniform pressing force across all electrodes, effectively restraining swelling while maintaining performance.
Solution Approach 2:
The battery case is designed with specific structural features including pressing portions that apply localized pressure to the electrode stack. This creates non-uniform local pressure distribution that compensates for the natural swelling tendencies, ensuring uniform constraint across different regions of the electrodes.
2Reliability
If uniform pressure is applied to restrain electrode swelling, then electrode constraint is effective, but pressure distribution becomes uneven
Solution Approach 1:
The battery case incorporates pressing portions at specific locations that apply localized pressure to the electrode stack. This design creates intentional non-uniform pressure distribution that compensates for natural swelling patterns, ensuring uniform constraint effectiveness across all electrodes despite the non-uniform pressure application.
Solution Approach 2:
The patent modifies the physical parameters of the battery case structure, including the shape and position of pressing portions, to optimize the pressure distribution. By adjusting these structural parameters, the system achieves effective electrode constraint while managing pressure distribution characteristics.
3Strength
If battery case is made of metal, then structural strength is high, but insulativity is poor and shape flexibility is limited
Solution Approach 1:
The patent employs laminate sheets composed of multiple material layers including metal, resin, and polymer components. This composite structure combines the high strength and rigidity of metal with the electrical insulation properties of resin and polymer materials, achieving both mechanical strength and electrical insulativity simultaneously.
Solution Approach 2:
The use of laminate sheets and polymer materials allows the battery case to exhibit flexible shape adaptation while maintaining structural integrity. These materials can be formed into various configurations including the vertical electrode stack arrangement, providing both mechanical support and design flexibility.
Data Source
AI summary
A battery cell is configured to have a structure in which an electrode stack is configured to have a structure in which positive electrodes and negative electrodes are stacked in a height direction. Separators are disposed respectively between the positive electrodes and the negative electrodes, and when mounted in a battery case in a sealed state. The electrode stack is configured to have a structure in which a length in a height direction, which is a stacked direction of the electrode stack, on the basis of the ground is greater than that in a width direction perpendicular to the height direction, and the battery case is formed in the shape of a pipe corresponding to an outside of the electrode stack.