Non-Aqueous Secondary Battery Electrode Ends With Swellable Resin
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Solution Overview
Problem
Non-aqueous electrolyte secondary batteries face challenges in maintaining high rate resistance due to temperature rise, which causes electrolyte outflow and increased internal resistance, particularly at the end portions of the electrode body.
Innovation Solution
Incorporating a resin portion made of swellable resin in the mixture layer non-forming areas of the electrodes, which increases the thermal capacity of the end portions and suppresses temperature rise, thereby improving high rate resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high rate charge and discharge is applied to the non-aqueous electrolyte secondary battery, then power output is improved, but temperature rise occurs causing electrolyte outflow and increased internal resistance
Solution Approach 1:
The patent applies local quality by placing resin portions with different thermal capacities at specific locations (end portions vs center portion) of the electrode body. The end portions, which experience greater temperature rise during high rate charge/discharge, are equipped with resin portions having higher thermal capacity to suppress temperature increase locally, thereby preventing electrolyte outflow and maintaining high rate resistance while allowing high power output.
2Reliability
If thermal capacity of end portions is increased, then temperature rise is suppressed and electrolyte outflow is prevented, but device complexity increases
Solution Approach 1:
The patent applies local quality by selectively enhancing thermal capacity only at the end portions of the electrode body where temperature rise and electrolyte outflow occur, rather than uniformly increasing thermal capacity throughout the entire electrode body. This targeted approach improves high rate resistance while minimizing additional structural complexity.
Solution Approach 2:
The resin portions act as intermediary elements that absorb and manage thermal energy at the end portions of the electrode body. These resin portions mediate between the electrode materials and the external environment, suppressing temperature rise and preventing electrolyte outflow without requiring fundamental changes to the battery's overall structure.
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 use of swellable resin in the non-forming portions of the electrode mixture layers enhances thermal capacity and effectively reduces the resistance increase rate during high rate charge and discharge cycles, maintaining battery performance over time.
Implementation Method 1
a resin portion substantially formed of a swellable resin having a property of swelling the non-aqueous electrolyte
Implementation Method 2
the thermal capacity of the end portions can be increased by the resin portion, and as a result, the temperature rise of the end portions can be suppressed
Data Source
AI summary
A non-aqueous electrolyte secondary battery, in which a positive electrode includes a positive electrode mixture layer in which a mixture containing a positive electrode active material is formed and a positive electrode mixture layer non-forming portion in which the positive electrode mixture layer is not formed, and a negative electrode includes a negative electrode mixture layer in which a mixture containing a negative electrode active material is formed and a negative electrode mixture layer non-forming portion in which the negative electrode mixture layer is not formed. At least one of the positive electrode mixture layer non-forming portion and the negative electrode mixture layer non-forming portion has a resin portion substantially formed of a swellable resin having a property of swelling the non-aqueous electrolyte.