Jelly-Roll Electrode Assembly With PCM Core Heat Compensation
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Solution Overview
Problem
The temperature difference between the center and outer shell of a jelly-roll type electrode assembly in secondary batteries leads to performance deterioration due to varying reaction rates.
Innovation Solution
Incorporating a temperature difference compensating member made of phase change material at the winding center of the electrode stack to absorb heat and reduce the temperature differential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a jelly roll type electrode assembly is used for high energy density, then energy density per weight is improved, but temperature difference between center and outer shell increases causing performance deterioration
Solution Approach 1:
The patent applies phase transition of paraffin wax (solid to liquid) at specific temperature ranges (40-60°C) to absorb excess heat generated during battery charging and discharging. The phase change material is placed in the winding center where heat accumulates, transforming thermal energy into latent heat of fusion, thereby reducing temperature differential between center and outer shell while maintaining high energy density.
Solution Approach 2:
The patent introduces a temperature difference compensating member (paraffin wax) as an intermediary substance between the electrode stack and the battery case. This mediator absorbs heat from the winding center through phase transition, preventing direct heat transfer to surrounding components and reducing thermal stress on the electrode assembly structure.
2Power
If heat is generated in the center of the cell during charging and discharging, then energy conversion is improved, but temperature difference causes difference in reaction rate deteriorating cell performance
Solution Approach 1:
The patent changes the thermal parameter of the battery system by introducing a material with specific heat capacity and phase transition temperature (40-60°C) matched to the operating conditions. This parameter change allows the system to maintain optimal temperature range for electrochemical reactions, ensuring consistent reaction rates throughout the cell while preserving high power output capability.
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 phase change material absorbs heat at elevated temperatures, reducing the temperature difference and preventing battery performance degradation.
Implementation Method 1
the temperature difference compensating member comprises a phase change material
Implementation Method 2
the phase change material may be changed in phase to absorb the heat of the winding center
Data Source
AI summary
An electrode assembly and a secondary battery including the same are provided. The electrode assembly includes an electrode stack, in which electrodes and a separator are alternately stacked to be wound, and a temperature difference compensating member disposed at a winding center of the electrode stack such that a temperature difference between a winding outer shell and a winding center of the electrode stack is reduced. The temperature difference compensating member includes a phase change material.