Insulated Battery Structure for Uniform Electrode Cooling
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Solution Overview
Problem
Batteries with electrically insulated electrode bodies and cases experience localized temperature differences, leading to reduced durability due to inefficient heat distribution and cooling.
Innovation Solution
A battery design featuring a resin body with concave regions that extend from one opening to another, electrically insulating the electrode body from the case, allowing for controlled heat transfer through non-contacting and contacting regions, with adjusted concave region proportions and tapered designs to enhance cooling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a resin body is used to electrically insulate the electrode body and the case, then electrical insulation is achieved, but localized temperature differences occur within the electrode body
Solution Approach 1:
The resin body is designed with differentiated local properties: concave regions (lower density) and flat regions (higher density). The flat regions provide thermal conduction paths to reduce temperature differences, while the concave regions maintain electrical insulation. This local quality variation resolves the contradiction between insulation and temperature uniformity.
Solution Approach 2:
The resin body functions as a composite structure combining regions with different thermal and electrical properties. The concave regions (with air pockets) provide electrical insulation, while the flat regions provide thermal conduction. This composite approach allows simultaneous achievement of both electrical insulation and temperature uniformity.
2Temperature
If the resin body has concave regions extending from one opening to another, then heat transfer is controlled through non-contacting and contacting regions, but the structure becomes more complex
Solution Approach 1:
The resin body is segmented into multiple functional regions: concave regions extending from one opening to another (providing thermal insulation), and flat regions (providing thermal conduction). This segmentation allows controlled heat transfer while maintaining a relatively simple monolithic structure that can be manufactured as a single piece.
3Reliability
If the first region (gasket contact region) has higher density than the second region (opposing electrode body), then electrical insulation is enhanced at the gasket interface, but thermal conduction becomes less efficient in this region
Solution Approach 1:
The resin body employs local quality variation with the first region (gasket contact area) having higher density for enhanced electrical insulation at the critical gasket interface, while the second region (opposing electrode body) has lower density optimized for thermal conduction. This local optimization resolves the trade-off between insulation and thermal conduction efficiency in different regions.
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 achieves a reduced temperature difference within the electrode body, improving durability by enhancing heat distribution and cooling efficiency.
Implementation Method 1
a resin body electrically insulating the electrode body and the case
Implementation Method 2
allowing for controlled heat transfer through non-contacting and contacting regions
Data Source
AI summary
A battery of the present disclosure has an electrode body, a case accommodating the electrode body, and a resin body electrically insulating the electrode body and the case. The electrode body includes a positive electrode current collector, a positive electrode active material layer, an electrolyte, a negative electrode active material layer and a negative electrode current collector. The case includes a metal tube having a first opening and a second opening, and covers that seal the first opening and the second opening respectively. The resin body includes plural concave regions extending from the first opening toward the second opening.