Battery Cell Assembly Bonding Structure for Thermal Runaway Venting
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Solution Overview
Problem
The rapid rise in temperature and potential for thermal runaway in battery modules due to inadequate heat dissipation leads to accelerated deterioration and increased risk of explosion or ignition, especially in high-temperature conditions and when thermal runaway occurs in one battery module, it can propagate to neighboring modules.
Innovation Solution
A cell assembly design featuring a first bonding body made of polymer foam with lower hardness and a second bonding body made of synthetic resin, where the polymer foam foams under heat to induce a vent and prevent flame propagation by applying to the electrode leads' protruding portions, while the resin contacts non-protruding portions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple battery cells are densely stacked to increase power output, then capacity and power output are improved, but heat dissipation becomes difficult and temperature rises rapidly
Solution Approach 1:
The bonding bodies are divided into multiple separate components (first bonding body and second bonding body) that are disposed between individual battery cells. This segmentation allows each bonding body to independently manage thermal conditions for adjacent cells, creating thermal zones that prevent rapid temperature propagation while maintaining dense cell stacking for high power output.
Solution Approach 2:
The bonding bodies serve as intermediary elements between adjacent battery cells. These intermediaries provide thermal isolation and heat dissipation pathways, mediating the thermal interaction between cells to prevent rapid temperature rise while allowing dense stacking for high power output.
2Stability of the object's composition
If bonding bodies with high hardness are used to secure battery cells, then structural stability is improved, but thermal propagation is accelerated due to efficient heat conduction
Solution Approach 1:
The bonding bodies are constructed from composite materials that combine structural stability with thermal isolation properties. These composite materials provide the mechanical strength needed to secure battery cells while simultaneously resisting thermal propagation, resolving the contradiction between stability and thermal protection.
3Object-affected harmful factors
If bonding bodies with low hardness are used to provide thermal isolation, then thermal propagation is delayed, but structural support and cell securing are insufficient
Solution Approach 1:
The bonding structure is segmented into multiple bonding bodies distributed between different battery cells. Each bonding body can be optimized for its specific function, and collectively they provide both thermal isolation and structural support, resolving the contradiction between thermal protection and mechanical strength.
4Ease of manufacture
If a single uniform bonding material is used for all battery cells, then manufacturing simplicity is maintained, but thermal isolation effectiveness is reduced due to lack of optimization for different positions
Solution Approach 1:
Different bonding bodies are assigned different properties or configurations based on their local requirements. This local quality optimization allows each bonding body to be tailored for maximum thermal isolation effectiveness at its specific position, while the overall multi-component structure can still be manufactured using standardized processes.
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 design effectively delays and prevents flame propagation between battery cells by inducing a vent at the electrode lead protruding portions, maintaining the integrity of the cell assembly and minimizing the risk of explosion.
Implementation Method 1
the polymer foam foams under heat to induce a vent and prevent flame propagation
Implementation Method 2
the polymer foam foams under heat to induce a vent
Data Source
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AI summary
A cell assembly according to an embodiment of the present disclosure may include a plurality of battery cells stacked on each other and each having an electrode lead; a first bonding body formed to contact the electrode leads of the plurality of battery cells; and a second bonding body formed to contact the plurality of battery cells and non-overlapped with the first bonding body, wherein the first bonding body may be made of a material having lower hardness than the second bonding body.