Cylindrical Battery Module Holder for Impact-Resistant Cell Support
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Solution Overview
Problem
The existing electric power storage modules with cylindrical batteries are prone to deformation due to the high flexibility of the film exterior body, compromising their holding strength and stability, especially when impacted.
Innovation Solution
The electric power storage module incorporates a holder with a side plate and wall plates that enhance the holding strength by fitting the containers into recesses and protruding in orthogonal directions, providing additional rigidity and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a plurality of electrode assemblies are wrapped with a common film exterior body, then the weight of the electric power storage module is reduced, but the holding strength is compromised due to high flexibility of the film exterior body
Solution Approach 1:
The film exterior body is divided into multiple containers that individually wrap each electrode assembly, providing segmented containment while maintaining overall flexibility. This segmentation allows each container to independently support its electrode assembly, preventing excessive deformation while keeping the overall structure lightweight.
Solution Approach 2:
The electrode assemblies are nested within containers that are themselves nested within the film exterior body. The containers act as intermediate structural elements between the flexible film exterior body and the rigid electrode assemblies, providing holding strength without requiring a heavy outer casing.
2Quantity of substance
If the outer covering can is eliminated to reduce weight, then energy density is improved, but the device becomes more susceptible to deformation under impact
Solution Approach 1:
The patent uses a flexible film exterior body to wrap the electrode assemblies, replacing traditional rigid outer covering cans. The film provides sufficient containment while allowing weight reduction and improved energy density. The flexibility of the film is compensated by the structural support from individual containers.
Solution Approach 2:
By segmenting the electrode assemblies into individually wrapped containers within the flexible film exterior body, the patent provides localized structural support without requiring a heavy continuous outer casing. This segmentation maintains protection against deformation while enabling weight reduction for improved energy density.
Data Source
AI summary
An electric power storage module includes an electric power storage device and a holder. The electric power storage device includes a plurality of electrode assemblies that have a cylindrical shape, and a film exterior body that includes a plurality of containers that individually wrap the plurality of electrode assemblies and a sealing part that seals the containers and connects the plurality of containers to each other. The holder includes a side plate extending in an arrangement direction. The side plate includes a plurality of recesses arranged in the arrangement direction and into which the containers are fitted, a first edge and a second edge arranged in an axial direction and extending in the arrangement direction, and a third edge and a fourth edge arranged in the arrangement direction and extending in the axial direction. In addition, the holder includes a first wall plate that is formed by a part of a member forming the side plate and protrudes in an orthogonal direction from at least a part of a region of the first edge.