Battery Cell Module With Detachable Bases And Pressure Relief Cavities
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Solution Overview
Problem
Cylindrical battery cells in modules suffer from inaccurate positioning and fail to rapidly discharge gas during thermal runaway, posing safety hazards due to gas accumulation.
Innovation Solution
A battery cell module design featuring detachable bases with pressure relief cavities and holes, allowing for precise cell positioning and rapid gas discharge through installation slots and relief holes, ensuring safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If battery cells are positioned by tooling and bonded together by glues, then assembly is simplified, but position accuracy of battery cells deteriorates due to cumulative tolerance
Solution Approach 1:
The base is divided into an upper base and a lower base that can be separately assembled. The upper base includes positioning structures (positioning grooves and positioning protrusions) that enable precise positioning of battery cells, while the lower base provides structural support. This segmentation allows high-precision positioning without requiring complex tooling fixtures during assembly.
2Strength
If negative terminals of battery cells are shielded, then structural integrity is improved, but gas discharge capability deteriorates during thermal runaway
Solution Approach 1:
The upper base acts as an intermediary structure between the battery cell negative terminal and the external environment. It provides shielding to protect the negative terminal while incorporating gas discharge holes that allow trapped gas to escape during thermal runaway events, thus resolving the conflict between structural protection and safety.
3Quantity of substance
If a large number of small capacity battery cells are used in a single string, then total capacity requirement is met, but assembly complexity increases due to numerous cells
Solution Approach 1:
Multiple battery cells are merged into a single modular assembly by mounting them together on a common base (upper base and lower base). This modular design allows multiple cells to be treated as one integrated unit, simplifying handling, installation, and maintenance while maintaining the required total capacity.
Data Source
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AI summary
The present application discloses a battery cell module and a battery system. The battery cell module includes a plurality of battery cell units, each of the battery cell units includes a battery cell and a base, and bases of adjacent ones of the battery cell units are detachably connected to each other; the base includes an installation slot and a pressure relief cavity communicated with each other, where an end of the battery cell is disposed in the installation slot, and the pressure relief cavity is provided with a plurality of pressure relief holes. Each battery cell is individually provided with the base, and the bases are spliced to form a group, which is beneficial to improve relative position accuracy between battery cells, thereby improving assembly accuracy of the battery cell module. The pressure relief cavity is communicated with the installation slot, which can make gas generated by the battery cell enter the pressure relief cavity under circumstance of thermal runaway and be discharged through the pressure relief holes to avoid burning or explosion of the battery cell. By adopting the above battery cell module, the battery system has high processing precision, low cost, and a reliable structure.