Solid-State Battery Module Casing for Cell Swelling Accommodation
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Solution Overview
Problem
Solid-state battery modules face issues with casing deformation and cell damage due to cell swelling, which can affect battery performance and safety.
Innovation Solution
The design includes a casing with movable side plates and deformation portions on the top and bottom plates, allowing for plastic deformation to accommodate swelling cells, and a connecting piece in the battery pack that can absorb deformation without breaking, ensuring stability and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the side plates are fixedly connected to the top plate and bottom plate, then the casing structure is stable and strong, but the cells may swell and cause casing deformation or cell damage
Solution Approach 1:
The side plates are designed to be movable relative to the top plate and bottom plate through sliding rails, transforming the static fixed connection into a dynamic adjustable connection. This allows the casing to adapt to cell swelling while maintaining structural integrity, resolving the contradiction between structural strength and cell safety
Solution Approach 2:
The connecting pieces are designed with plastic deformation capability, allowing them to change their mechanical properties from rigid to flexible under swelling forces. This parameter change enables the connection to absorb swelling stress while maintaining overall structural strength, preventing both casing deformation and cell damage
2Strength
If the connecting piece is rigid, then the connection between side plate and box body is strong, but the connecting piece may break when cells swell
Solution Approach 1:
The connecting piece is designed to undergo plastic deformation when subjected to swelling forces, changing its mechanical state from rigid to flexible. This allows it to absorb swelling stress without breaking while maintaining connection strength, resolving the contradiction between connection strength and breakage resistance
Solution Approach 2:
The connecting piece is pre-designed with plastic deformation capability to cushion the swelling forces before they can transmit to the side plates or box body. This beforehand cushioning prevents connecting piece breakage while maintaining strong connections under normal conditions
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
This design prevents casing deformation and cell damage, improving battery performance and safety by allowing the side plates to move and the connecting piece to deform plastically, maintaining structural integrity during cell swelling.
Implementation Method 1
at least one of the side plates is able to move relative to the top plate and the bottom plate in a first direction, and the first direction is a stacking direction of the cell stack
Implementation Method 2
the first deformation portions are able to produce plastic deformation in the first direction
Implementation Method 3
the connecting piece is able to produce plastic deformation in the first direction
Data Source
AI summary
A solid-state battery module and a battery pack belonging to the technical field of batteries are provided. The solid-state battery module includes a casing and a cell stack disposed in the casing. The casing includes a top plate, a bottom plate, and two side plates, The two side plates are connected between the top plate and the bottom plate, and the two side plates are opposite to each other. At least one of the side plates is able to move relative to the top plate and the bottom plate in a first direction. In the battery pack provided by the disclosure, each of the side plates of the solid-state battery module and the box body are connected by a connecting piece. The connecting piece is able to generate plastic deformation in the stacking direction of the cell stack.