Battery Module Buffer Structure for Cell Sealing Swelling Restraint
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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 restrain the swelling of the sealing portion, reducing the risk of failure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cell housing is sealed to prevent gas leakage, then the sealing reliability is improved, but the internal gas accumulation causes swelling that can lead to sealing failure
Solution Approach 1:
The buffer is pre-installed between the cell housing and the first bracket to provide cushioning before swelling occurs. When gas accumulation causes swelling, the buffer absorbs the expansion force, preventing direct contact between the swollen cell housing and the bracket, thereby avoiding sealing failure.
Solution Approach 2:
The buffer acts as an intermediary element between the cell housing and the first bracket. It mediates the interaction by absorbing the swelling force, preventing the harmful direct contact that would compromise the sealing portion while maintaining the structural integrity of the battery module.
2Reliability
If the first bracket covers the first end surface to restrain swelling, then the sealing portion protection is improved, but the bracket deformation increases under swelling pressure
Solution Approach 1:
The buffer is positioned beforehand to absorb swelling forces before they can cause significant bracket deformation. This cushioning effect protects the first bracket from excessive stress while maintaining its structural shape and functionality.
Solution Approach 2:
The buffer serves as a mediator that absorbs the swelling pressure, reducing the force transmitted to the first bracket. This prevents excessive bracket deformation while still allowing the bracket to maintain its coverage and restraining function over the first end surface.
3Reliability
If the buffer is positioned between the elastic member and cell assembly to restrict swelling, then the sealing portion swelling is reduced, but the buffer must extend beyond the first end surface increasing structural complexity
Solution Approach 1:
The buffer extends in multiple directions: it is positioned between the elastic member and cell assembly along the first direction, and also extends beyond the first end surface in the second direction. This multi-dimensional positioning allows the buffer to effectively restrict swelling while maintaining a relatively simple overall structure that integrates with the existing battery module components.
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 design effectively restricts the swelling of the sealing portion, enhancing the reliability of the battery module by reducing the risk of sealing failures and improving overall performance.
Implementation Method 1
the buffer includes a first section, and along a second direction, the first section extends beyond the first end surface close to the buffer... When the cell swells, the first coverage portion closest to the elastic member moves towards the elastic member, and then the first section of the buffer abuts against the elastic member, restraining the first coverage portion from moving closer to the elastic member
Data Source
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AI summary
A battery module (20) includes a cell assembly (22), an elastic member (224), and a buffer (225), the cell assembly (22) includes a plurality of cell units (221) stacked along a first direction (X), the cell units (221) includes a cell (2211) and a first bracket. The cell (2211) includes a cell housing (22111), an electrode assembly (22112), and electrode terminals (22113), the cell housing (22111) includes a main body (22111a) and a first sealing portion (22111b), the main body (22111a) is provided with a first end surface (2211a), the first sealing portion (22111b) is connected to the first end surface (2211a). The first bracket (2212) includes a first coverage portion (22121), the first coverage portion (22121) covers at least a part of the first end surface (2211a). Along the first direction (X), the buffer (225) is provided between the elastic member (224) and the cell assembly (22). The buffer (225) includes a first section (2251), along a second direction (Y), the first section (2251) extends beyond the first end surface (2211a) close to the buffer (225), where the first direction (X) is perpendicular to the second direction (Y).