Battery Pack Blocking Cover for Controlled Flame Venting
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Solution Overview
Problem
Lithium secondary batteries are prone to overcharging, leading to potential explosions or ignitions, which can cause flames to spread and gases to be discharged in undesirable directions, compromising the stability and safety of battery modules and vehicles.
Innovation Solution
A battery pack design featuring a blocking cover that opens in a preset direction to discharge flames and gases generated from a battery module, using a blocking cover with a first and second blocking part and a flame gas guide channel member to direct the discharge away from neighboring modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blocking cover is added to prevent flame propagation, then safety is improved, but device complexity increases
Solution Approach 1:
The blocking cover is divided into multiple blocking parts (first blocking part, second blocking part) that can independently open in different directions. This segmentation allows the cover to selectively discharge flames and gases in controlled directions while maintaining protection in other areas, resolving the contradiction by providing safety functionality without requiring a completely sealed complex structure.
Solution Approach 2:
The blocking cover transitions from a static sealed structure to a dynamic structure that can open in response to internal pressure from flames or gases. The cover automatically opens in a preset direction when pressure exceeds a certain threshold, allowing harmful substances to be discharged away from neighboring modules while maintaining structural simplicity.
2Object-affected harmful factors
If the blocking cover is made fully sealed to prevent flame leakage, then flame propagation is prevented, but gas discharge control is lost
Solution Approach 1:
The blocking cover is divided into multiple blocking parts that can open independently in different directions. This allows the structure to simultaneously prevent flame propagation to neighboring modules while providing controlled discharge paths for gases generated during thermal events.
Solution Approach 2:
Different portions of the blocking cover have different functionalities - some areas remain sealed to prevent flame leakage, while other areas (blocking parts) are designed to open in specific directions for controlled gas discharge. This local differentiation resolves the contradiction between flame containment and gas discharge control.
3Object-affected harmful factors
If a complex blocking structure is used to control discharge direction, then discharge control is improved, but manufacturing cost increases
Solution Approach 1:
Instead of using a complex fixed structure with multiple guides and channels, the invention uses a dynamic blocking cover that automatically opens in a preset direction when pressure builds up. This simple mechanical response achieves discharge direction control without requiring complex manufacturing, resolving the contradiction between control precision and manufacturing cost.
Solution Approach 2:
The blocking cover automatically opens in response to internal pressure from flames or gases, using the force generated by the thermal event itself to control the discharge direction. This self-actuating mechanism eliminates the need for external control systems or complex mechanical guides, reducing manufacturing costs while maintaining effective discharge control.
Data Source
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AI summary
Disclosed are a battery pack and a vehicle including the same. The battery pack includes a plurality of battery modules in which a plurality of battery cells are stacked; a pack case configured to accommodate the plurality of battery modules; and a blocking cover configured to cover at least a portion of the battery module to be opened in a preset direction by flame or gas.