Battery Module Partition Structure for BMS Thermal Runaway Isolation
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Solution Overview
Problem
Cylindrical battery modules require a larger box volume to separate battery cells and BMS boards, leading to poor compactness and increased area occupation.
Innovation Solution
A battery module design that includes a protective member between the battery cell assembly and the upper cover, completely separating the BMS board and battery cell, and utilizing an integrally formed protective member and upper cover to maintain compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separated cavities are provided in the box to place battery cells and BMS board, then physical separation between battery cells and BMS board is achieved, but the box volume increases and the structure compactness deteriorates
Solution Approach 1:
The interior space of the box is segmented into a first cavity for battery cells and a second cavity for the BMS board using a partition plate. This segmentation achieves physical separation for safety while maintaining a compact overall box volume, resolving the contradiction between reliability and volume.
Solution Approach 2:
A partition plate is introduced as an intermediary structure between the battery cells and BMS board. This partition plate creates the necessary separation for thermal runaway protection without requiring a larger box volume, thus resolving the contradiction between safety and compactness.
2Reliability
If two separated cavities are provided in the box to place battery cells and BMS board, then physical separation between battery cells and BMS board is achieved, but the structure compactness deteriorates
Solution Approach 1:
The box interior is segmented into functional zones using a partition plate, achieving physical separation for reliability while maintaining a compact and simple overall structure. The segmentation is implemented in a way that does not compromise structural compactness.
3Reliability
If protective member is arranged around BMS board and abuts against bracket, then BMS board is protected from thermal runaway gas, but the structure complexity increases
Solution Approach 1:
The protective member is merged with the partition plate structure, combining the functions of separation and protection into a single integrated component. This reduces structural complexity while maintaining the protective function during thermal runaway events.
Solution Approach 2:
The partition plate is designed to serve multiple functions: separating the battery cells from the BMS board, providing structural support, and acting as a protective barrier during thermal runaway. This multi-functionality reduces the need for additional protective components, thereby reducing overall structural complexity.
Data Source
AI summary
A battery module is provided. The battery module includes a box, a battery cell assembly, an upper cover and a battery management system (BMS) board. The battery cell assembly is arranged in the box, the BMS board is mounted on the upper cover, the box is provided with an opening, and the upper cover is arranged to cover the opening. The battery cell assembly includes a bracket and a battery cell arranged in the bracket, the BMS board is located on the bracket and is electrically connected to the battery cell. The battery module further includes a protective member connected into the upper cover. The battery cell is ejected toward an outer side face of the protective member, the protective member is arranged around an outer side of the BMS board and arranged to abut against the bracket to separate the BMS board and the battery cell.