Battery Cell Conductive Layer for Internal Heat Dissipation
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Solution Overview
Problem
Current lithium-ion battery cells face inefficiencies in heat dissipation due to air gaps between the electrode assembly and the metallic battery can, which can reduce thermal performance and may not be adequately addressed by external cooling strategies.
Innovation Solution
Incorporating a conductive layer formed from a liquid solution containing an organic solvent, cross-linkable polymer, and cross-linking agent, which is converted into a gel-like form by reacting with heat, placed between the electrode assembly and the battery can to enhance internal heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external cooling plates are disposed between battery cells or within battery packs, then heat dissipation capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The invention extracts the heat dissipation function from external cooling systems and integrates it directly into the battery can structure. The can itself becomes the heat dissipation component through embedded conductive layers, eliminating the need for separate cooling plates and reducing overall system complexity.
Solution Approach 2:
The invention merges the structural function of the battery can with the thermal management function by integrating conductive layers directly into the can walls. This combination allows the can to simultaneously serve as both the enclosure and the heat dissipation pathway, reducing the number of separate components needed.
2Stability of the object's composition
If air gaps are maintained between electrode assembly and battery can, then electrode expansion space is provided, but thermal performance deteriorates due to reduced heat conduction
Solution Approach 1:
The invention applies different properties to different regions: the air gap is maintained in the central region to allow electrode expansion, while conductive layers are applied locally to the can walls facing the electrodes to enhance heat dissipation. This localized differentiation resolves the contradiction by allowing both expansion space and thermal performance optimization in their respective zones.
Solution Approach 2:
The invention creates an asymmetric thermal management structure where the can walls are modified with conductive layers while the central void space remains unchanged. This asymmetric approach allows the structure to simultaneously provide expansion space (through the maintained central gap) and improved thermal performance (through the modified can walls).
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
This internal conductive layer improves heat dissipation within the battery cell, outperforming existing strategies without compromising thermal runaway characteristics, thereby enhancing thermal performance.
Implementation Method 1
converting the liquid solution into a gel-like form by reacting with heat
Implementation Method 2
converted into a gel-like form by reacting the cross-linkable polymer and the cross-linking agent
Implementation Method 3
The conductive layer may be more effective than current cooling or heat-dissipation strategies... for effective and consistent heat dissipation
Data Source
AI summary
A method for making a battery cell includes: disposing an electrode assembly within a battery can; assembling a top cap assembly to the battery can to form a battery cell having at least a first filling hole and a second filling hole; disposing a first portion of a liquid solution within the battery cell via the first filling hole, the liquid solution including an organic solvent, a cross-linkable polymer and a cross-linking agent; converting the first portion of the liquid solution into a first conductive layer disposed between the electrode assembly and the battery can; disposing a second portion of the liquid solution within the battery cell via the second filling hole; converting the second portion of the liquid solution into a second conductive layer disposed between the electrode assembly and the battery can; and filling the battery cell with a liquid electrolyte via an electrolyte filling hole.