Battery Cover Fixing Structure for Thermal Runaway Blocking
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Solution Overview
Problem
Secondary battery devices face challenges in preventing thermal runaway and propagation due to the spread of heat, gas, or flames between stacked battery cells, which can lead to damage and increased weight or production costs from coupling components for fixing heat blocking members.
Innovation Solution
A battery device design incorporating a fixing structure that secures heat blocking members without separate coupling components or processes, using a case with a venting hole and heat blocking members made of materials like mica sheets or ceramic wool, where the heat blocking members are integrated into the cover and accommodating portion to delay thermal propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coupling components (e.g., bolts) or coupling processes (e.g., welding) are used to fix the heat blocking member to the case, then the heat blocking member can be securely fixed to maintain a sealed space, but the weight of the battery device increases and production costs increase
Solution Approach 1:
The fixing structure integrates the heat blocking member fixation directly into the case body, eliminating the need for separate coupling components. The case includes integrated fixing structures such as recesses or protrusions that directly engage with the heat blocking member, merging the case and fixing mechanism into a single unified structure, thereby reducing weight while maintaining secure fixation.
Solution Approach 2:
The case structure itself provides the fixing function through integrated fixing structures formed as part of the case body. The case serves dual purposes: containing the battery cells and simultaneously securing the heat blocking member without requiring external coupling components, allowing the system to serve itself and reduce overall weight.
2Reliability
If coupling components (e.g., bolts) or coupling processes (e.g., welding) are used to fix the heat blocking member, then the heat blocking member can be securely fixed, but the production costs of the heat blocking member increase
Solution Approach 1:
The fixing structure merges the case and heat blocking member fixation into a single integrated design. The case includes built-in fixing structures such as recesses or protrusions that directly engage with the heat blocking member, eliminating the need for separate coupling components and simplifying the manufacturing process, thereby reducing production costs while maintaining secure fixation.
Solution Approach 2:
The case structure itself provides the fixing function through integrated fixing structures, eliminating the need for additional coupling components or complex assembly processes. This self-service approach simplifies manufacturing and reduces production costs while ensuring reliable fixation of the heat blocking member.
3Volume of moving object
If battery cells are stacked to form a cell assembly, then space utilization is improved, but heat, gas, or flames occurring in one battery cell can spread to other battery cells, resulting in thermal runaway or thermal propagation
Solution Approach 1:
The battery device is segmented into multiple compartments by heat blocking members positioned between stacked battery cells. These heat blocking members create physical barriers that divide the cell assembly into separate thermal zones, preventing heat, gas, or flames from spreading between adjacent battery cells while maintaining compact stacking for efficient space utilization.
Solution Approach 2:
Heat blocking members serve as intermediary barriers between stacked battery cells. These intermediaries physically separate adjacent cells and block the transmission of heat, gas, and flames, preventing thermal propagation while allowing the battery cells to remain closely stacked for optimal space utilization.
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 solution effectively reduces the spread of heat and flames between battery cells, decreases the weight and production costs of the battery device, and enhances safety by preventing thermal runaway while maintaining a sealed space.
Implementation Method 1
a heat blocking member to reduce the spread of heat, gas, or flames between a plurality of battery cells
Implementation Method 2
Gas occurring in the plurality of battery cells may pass through the second heat blocking member and the venting hole to be discharged to the outside of the battery device
Data Source
AI summary
A battery device includes a case including a cover having a venting hole formed therein, a cell assembly disposed within the case and including a plurality of battery cells, a fixing structure formed on a rear surface of the cover, a first heat blocking member having at least a portion disposed between at least some of the plurality of battery cells and including a first end connected to the fixing structure, and a second heat blocking member disposed between the cell assembly and the cover and covering the venting hole.