Battery Cell Surface Pressure Member for Uniform Pack Compression
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Solution Overview
Problem
When multiple battery cells are disposed in a single case, uneven surface pressure application due to expansion of one cell can cause deterioration of other cells.
Innovation Solution
A battery device with a cell assembly, case, and a surface pressure member comprising a flexible outer cover, support member, and reinforcing frame is designed to minimize surface pressure deviation by using a liquid support member injected into the outer cover and cured to provide uniform pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple battery cells are disposed in a single case, then space utilization is improved, but surface pressure deviation occurs causing cell deterioration
Solution Approach 1:
A surface pressure member is introduced as an intermediary component between the battery cells and the case. This member includes a flexible outer cover filled with liquid support material, which mediates the pressure transmission to ensure uniform surface pressure distribution across all battery cells, preventing deterioration while maintaining high cell density in the case.
Solution Approach 2:
The patent changes the physical state of the support material from solid to liquid phase. The liquid support material injected into the outer cover can flow and adapt to the contours of the battery cells, providing uniform pressure distribution. The liquid phase allows the support member to conform to variations in cell dimensions and positioning, ensuring consistent surface pressure across all cells.
2Manufacturing precision
If a rigid support structure is used to maintain cell position, then positioning precision is improved, but surface pressure uniformity deteriorates
Solution Approach 1:
The outer cover is designed as a flexible shell that can deform and adapt to the shape of the battery cells. This flexibility allows the liquid support material inside to distribute pressure uniformly across the cell surfaces while maintaining proper cell positioning. The flexible nature of the outer cover enables it to accommodate slight variations in cell dimensions without creating pressure concentration points.
Solution Approach 2:
The patent utilizes hydraulic principles by filling the outer cover with liquid support material. The liquid, being incompressible and flowable, transmits pressure uniformly in all directions (Pascal's principle), ensuring that the surface pressure is distributed evenly across all battery cells while the flexible outer cover maintains their positions.
3Stress or pressure
If a flexible outer cover is used to provide uniform pressure, then pressure distribution is improved, but structural strength deteriorates
Solution Approach 1:
The surface pressure member is designed as a composite structure combining a flexible outer cover (made of elastomer or rubber) with liquid support material inside. This composite design leverages the flexibility and conformability of the outer cover material while the liquid provides uniform pressure distribution. The combination achieves both pressure uniformity and sufficient structural strength to maintain cell positioning.
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 solution effectively minimizes surface pressure deviation, enhancing battery cell lifespan and performance by uniformly distributing pressure across the cell assembly.
Implementation Method 1
injecting a support member in a liquid phase into an interior of the outer cover; curing the support member in the liquid phase
Data Source
AI summary
A battery device according to the present disclosure may include: a cell assembly having a plurality of battery cells arranged in a first direction; a case having an accommodation space in which the cell assembly is accommodated; and a surface pressure member disposed between the cell assembly accommodated in the accommodation space and the case, wherein the surface pressure member may include: an outer cover having a sealed inner space and formed of a flexible material; a support member disposed in the inner space of the outer cover; and a reinforcing frame coupled to both ends of the outer cover.