Battery Module Buffer Layout for Sealing Portion Swelling Control
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Solution Overview
Problem
The reliability of batteries is compromised due to swelling caused by gas accumulation during charge/discharge cycling, which can lead to sealing failures and reduced performance.
Innovation Solution
A battery module design that includes a cell assembly with an elastic member and a buffer, where the buffer extends beyond the cell housing to restrict swelling and prevent sealing failures, enhancing the module's reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cell housing is designed with a first sealing portion connected to the first end surface, then the sealing performance is improved, but the swelling of the cell during cycling causes the first sealing portion to deform and fail
Solution Approach 1:
The buffer is pre-installed between the elastic member and the cell assembly to provide beforehand cushioning. When the cell swells during cycling, the buffer compresses to absorb the expansion force, preventing direct transmission of swelling stress to the first sealing portion and first bracket, thereby avoiding sealing failure while maintaining reliable sealing performance
Solution Approach 2:
The buffer acts as an intermediary element between the swelling cell and the rigid first bracket. It mediates the interaction by providing a compliant interface that absorbs swelling forces, protecting the first sealing portion from deformation while allowing controlled movement of the first coverage portion
2Strength
If the first bracket covers at least a part of the first end surface, then the structural support is improved, but the first coverage portion moves towards the elastic member when the cell swells, risking contact and potential failure
Solution Approach 1:
The buffer serves as an intermediary that prevents direct contact between the first coverage portion and the elastic member. It allows the first coverage portion to move towards the elastic member during swelling while maintaining a safe distance, preserving both structural support and reliability
Solution Approach 2:
The buffer provides preliminary anti-action by opposing the movement of the first coverage portion towards the elastic member before contact occurs. This counteracting force prevents potential failure while allowing necessary structural movement
3Reliability
If the buffer includes a first section extending beyond the first end surface, then the restriction of swelling is improved, but the device complexity increases
Solution Approach 1:
The first section of the buffer extends in a second direction perpendicular to the first direction, creating a three-dimensional structure that provides swelling restriction through spatial extension rather than increasing complexity in the primary direction. This dimensional approach efficiently restricts swelling while maintaining design simplicity
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 proposed solution effectively restricts the swelling of the battery's sealing portion, reducing the risk of failure and improving the overall reliability of the battery module.
Implementation Method 1
the elastic member and the cell assembly are arranged along the first direction. Along the first direction, the buffer is provided between the elastic member and the cell assembly
Implementation Method 2
the buffer includes a first section, and along a second direction, the first section extends beyond the first end surface close to the buffer
Data Source
AI summary
A battery module includes a cell assembly, an elastic member, and a buffer, the cell assembly includes a plurality of cell units stacked along a first direction, the cell units includes a cell and a first bracket. The cell includes a cell housing, an electrode assembly, and electrode terminals, the cell housing includes a main body and a first sealing portion, the main body is provided with a first end surface, the first sealing portion is connected to the first end surface. The first bracket includes a first coverage portion, the first coverage portion covers at least a part of the first end surface. Along the first direction, the buffer is provided between the elastic member and the cell assembly. The buffer includes a first section, along a second direction, the first section extends beyond the first end surface close to the buffer.