Offset Cell Laminate Structure for Battery Expansion Control
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Solution Overview
Problem
Existing battery cell laminates experience significant dimensional changes in the laminating direction due to expansion and contraction, particularly in all-solid-state batteries, which can lead to excessive pressure and hinder efficient mounting on vehicles.
Innovation Solution
A cell laminate design with battery cells laminated offset in one direction and separated by elastic bodies with a parallelogram shape, allowing displacement in orthogonal directions to absorb expansion and contraction, reducing dimensional changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If battery cells are laminated in the conventional manner, then the battery cell expands or contracts depending on usage conditions, but this causes significant dimensional changes in the laminating direction which leads to excessive pressure and hinders efficient mounting
Solution Approach 1:
The patent introduces a diagonal arrangement of elastic bodies between adjacent battery cells, creating a geometric configuration where expansion in the laminating direction (first direction) is converted into displacement in both the laminating direction and the orthogonal direction (second direction). This dimensional redistribution reduces the net dimensional change in the laminating direction while accommodating cell expansion.
Solution Approach 2:
The patent changes the physical state and arrangement parameters by using elastic bodies with specific elastic properties positioned diagonally between cells. This configuration allows the system to dynamically adjust its dimensional parameters in response to expansion forces, transforming the rigid dimensional constraints into a flexible system that can absorb volume changes while maintaining overall dimensional stability.
2Stress or pressure
If spring structures are used to connect contact portions, then excessively high pressure is not applied to the laminate when it expands, but the dimensional change in the laminating direction is not sufficiently reduced
Solution Approach 1:
The patent employs an asymmetric diagonal arrangement of elastic bodies between adjacent battery cells rather than a symmetric vertical or horizontal configuration. This asymmetric geometry is specifically designed to convert expansion forces into bidirectional displacement, effectively reducing dimensional changes in the laminating direction while distributing pressure evenly across the cell assembly.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively reduces dimensional changes in the laminating direction, facilitating easier mounting on vehicles and improving energy density by efficiently managing cell expansion and contraction.
Implementation Method 1
an elastic body is arranged between adjacent battery cells of the plurality of battery cells; and the elastic body is configured so that when the battery cells expand, the battery cells are displaced in the first direction and are displaced to the other side in the second direction
Data Source
AI summary
A cell laminate includes a plurality of battery cells which are laminated. The plurality of battery cells are laminated in a first direction and are laminated to be offset to one side in a second direction orthogonal to the first direction. An elastic body is arranged between adjacent battery cells of the plurality of battery cells. The elastic body is configured so that when the battery cells expand, the battery cells are displaced in the first direction and are displaced to the other side in the second direction.