Battery Cover Venting Structure With Heat Blocking Members
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Solution Overview
Problem
Secondary battery devices face issues with thermal runaway and propagation due to heat, gas, or flames spreading between stacked battery cells, which can damage components and increase production costs and weight with traditional coupling methods for 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 conductive members, and heat blocking members made of materials like mica sheets or ceramic wool to delay thermal propagation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If heat blocking members are coupled to the case using coupling components (e.g., bolts) or coupling processes (e.g., welding), 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 heat blocking member is integrated directly into the case structure as a unified component, eliminating the need for separate coupling components like bolts or welding processes. This merging of the heat blocking member with the case reduces the overall weight while maintaining the sealed space function.
Solution Approach 2:
The case structure itself provides the fixing function through its integrated design, where the heat blocking member is formed as part of the case or directly attached without external fastening mechanisms. The case serves both its structural purpose and the heat blocking fixation purpose simultaneously.
2Reliability
If heat blocking members are coupled to the case using coupling components (e.g., bolts) or coupling processes (e.g., welding), then the heat blocking member can be securely fixed to maintain a sealed space, but the production costs of the heat blocking member increase
Solution Approach 1:
The heat blocking member and case are designed as an integrated structure, eliminating the need for separate manufacturing and assembly processes for coupling components. This reduces production complexity and costs while ensuring reliable fixation.
Solution Approach 2:
The case structure inherently provides the fixation function through its integrated design, eliminating the need for additional coupling processes like welding or bolting. This self-fixing design simplifies manufacturing and reduces production costs.
3Quantity of substance
If battery cells are stacked to form a cell assembly, then the battery device can achieve higher energy density, but heat, gas, or flames occurring in one battery cell may spread to other battery cells, resulting in thermal runaway or thermal propagation
Solution Approach 1:
The case is divided into multiple compartments or sections, each accommodating individual battery cells or groups of cells. This segmentation physically isolates heat, gas, or flames within each compartment, preventing thermal propagation while maintaining high energy density through efficient stacking.
Solution Approach 2:
Heat blocking members are positioned between adjacent battery cells or compartments within the stacked cell assembly. These intermediaries block thermal transfer and flame spread, allowing the battery device to maintain high energy density through compact stacking while preventing thermal runaway propagation.
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 gas between battery cells, preventing thermal runaway while minimizing weight and production costs by integrating the heat blocking members directly into the device's structure.
Implementation Method 1
a first heat blocking member having at least a portion disposed between at least some of the plurality of battery cells
Implementation Method 2
a case including a cover having a venting hole formed therein; 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
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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.