Bottom Support Plate Venting for Battery Thermal Runaway Gas
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Solution Overview
Problem
Existing battery technology lacks an effective mechanism to quickly discharge high-temperature gas generated during thermal runaway of the electrode assembly, leading to a risk of battery explosion due to gas accumulation.
Innovation Solution
A bottom support plate with an exhaust groove is designed to facilitate the discharge of gas generated during thermal runaway. The exhaust groove runs through the peripheral edge of the bottom support plate and communicates with the gap between the shell and the insulating sleeve film, allowing for timely gas discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bottom support plate is disposed at the bottom of the battery cell case to support the electrode assembly, then the electrode assembly is supported and the bottom is sealed, but the high-temperature gas generated during thermal runaway cannot discharge in time, leading to battery explosion risk
Solution Approach 1:
The bottom support plate is segmented into a plate body and a connecting plate, with an exhaust groove formed between them. This segmentation creates a dedicated gas discharge pathway while maintaining the structural support function, allowing gas to escape through the groove without compromising the overall sealing and support integrity of the bottom support plate
Solution Approach 2:
The exhaust groove extracts the gas discharge function from the solid bottom support structure. By creating a groove that runs through the peripheral edge of the plate body, the design separates the support/sealing function from the gas discharge function, allowing high-temperature gas to be discharged through the groove to the gap between the shell and insulating sleeve film
2Manufacturing precision
If mechanical cutting is used to form the exhaust groove, then the groove can be precisely formed, but the manufacturing process becomes complex and costs increase
Solution Approach 1:
The plate body and connecting plate are combined through welding or bonding to form the exhaust groove structure. This merging approach eliminates the need for complex mechanical cutting operations, as the groove is formed by the assembly process itself. The welding or bonding connection maintains structural integrity while simplifying manufacturing
Solution Approach 2:
The mechanical cutting process is replaced with welding or bonding processes to form and connect the plate components. This substitution maintains the precision of the exhaust groove formation while significantly simplifying the manufacturing process and reducing costs, as welding/bonding can be more easily automated and integrated into production lines
Data Source
AI summary
A bottom support plate configured to support an electrode assembly in a battery cell includes: a bottom support plate body; a connecting plate, wherein the connecting plate is arranged on the lower surface of the bottom support plate body, and an exhaust groove is formed between an edge of the connecting plate and the lower surface of the bottom support plate body, the exhaust groove runs through the peripheral edge of the bottom support plate body at least along a first direction and a second direction, the first direction and the second direction are both perpendicular to the thickness direction of the bottom support plate body, and the exhaust groove is configured to communicate with a gap between a shell and an insulating sleeve film of the battery cell. The exhaust groove of the present application runs through the peripheral edge of the bottom support plate body.