Wound Battery Cell Current Collector Layout for Heat Dissipation
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Solution Overview
Problem
Existing secondary batteries face challenges in effectively dissipating heat, which can affect their stability and performance.
Innovation Solution
The battery cell design includes a cap plate with non-polar and polar regions, a current collector connected to both, and a specific configuration of plates and connecting parts to manage heat dissipation efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a conventional battery cell structure is used, then the structure is simple, but heat dissipation is ineffective
Solution Approach 1:
The cap plate is divided into a polar region and a non-polar region, creating distinct functional zones. The current collector is segmented into multiple plates (first current collector plate, second current collector plate) with different functions. This segmentation allows heat to be dissipated through dedicated pathways while maintaining structural organization.
Solution Approach 2:
Different regions of the cap plate are assigned different properties: the polar region is conductive and thermally active, while the non-polar region is insulating. The first current collector plate contacts the polar region for heat dissipation, while the second contacts the non-polar region for electrical isolation. This local differentiation optimizes heat dissipation without compromising safety.
2Temperature
If the current collector is positioned close to the electrode assembly, then the device is compact, but heat dissipation efficiency is reduced
Solution Approach 1:
The heat dissipation pathway is extended in the vertical dimension by stacking multiple current collector plates (first and second plates) at different heights. The first plate contacts the electrode assembly at one level while the second plate contacts the cap plate at another level, creating a three-dimensional heat dissipation network that maximizes surface area without increasing the battery's footprint.
3Reliability
If electrical isolation is enhanced, then safety is improved, but thermal conduction may be compromised
Solution Approach 1:
The current collector system is segmented into multiple plates with distinct functions. The second current collector plate specifically contacts the non-polar (insulating) region to provide electrical isolation, while the first plate contacts the polar region for thermal conduction. This segmentation allows simultaneous optimization of both electrical safety and thermal management.
Solution Approach 2:
Different portions of the current collector system are assigned different material properties: some regions prioritize electrical conductivity and thermal conduction (contacting polar regions), while other regions prioritize electrical insulation (contacting non-polar regions). This local quality differentiation resolves the contradiction between electrical safety and thermal efficiency.
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 design enhances heat dissipation, improving the stability and performance of the battery cell by controlling the flow of heat and maintaining electrical isolation.
Implementation Method 1
the non-polar region may include an insulating material that electrically separates it from the polar region
Implementation Method 2
a method for adjusting the direction of heat movement is required
Data Source
AI summary
A battery cell of the present disclosure includes an electrode assembly in which an electrode including a flag and a separator are wound, a can accommodating the electrode assembly, a cap plate sealing the can, and a current collector disposed between the cap plate and the electrode assembly and in contact with the flag, the can, and the cap plate, respectively.