Electrode Functional Layer Layout for Battery Electrolyte Retention
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Solution Overview
Problem
Secondary batteries face challenges in achieving high energy density and long cycle life due to insufficient electrolyte retention, leading to uneven electrolyte distribution and poor appearance.
Innovation Solution
An electrochemical apparatus is designed with an electrode assembly that includes a current collector with a functional layer in a specific volume ratio to the active material layer, enhancing electrolyte retention and alleviating swelling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If surplus electrolyte is injected into the battery to increase electrolyte retention amount, then cycling performance is improved, but electrolyte swelling occurs causing unsmooth surface and poor appearance
Solution Approach 1:
The patent applies a functional layer specifically to the current collector in regions without active material (edge regions), creating local electrolyte absorption capacity where it is most needed. This localized approach absorbs surplus electrolyte at the edges, preventing overall battery swelling while maintaining appearance flatness, thus resolving the contradiction between cycling performance improvement and appearance quality
2Duration of action of stationary object
If electrolyte addition amount is increased to compensate for consumption during cycling, then cycle life is extended, but battery appearance becomes unsmooth due to uneven electrolyte movement
Solution Approach 1:
The functional layer is selectively applied to edge regions of the current collector where electrolyte accumulation occurs during cycling. This creates localized absorption zones that prevent uneven electrolyte distribution, allowing increased electrolyte addition for extended cycle life without compromising surface smoothness or appearance quality
3Shape
If functional layer volume ratio is increased to absorb more electrolyte, then appearance flatness is improved, but energy density is reduced
Solution Approach 1:
The functional layer is applied only to specific edge regions of the current collector rather than the entire surface, creating localized electrolyte absorption zones. This minimizes the overall volume ratio of the functional layer while still effectively absorbing surplus electrolyte to maintain appearance flatness, thereby preserving energy density
Solution Approach 2:
The current collector surface is segmented into regions with active material and regions without active material. The functional layer is applied only to the non-active material regions, dividing the electrolyte absorption function from the energy storage function. This segmentation allows appearance flatness improvement without significant energy density loss
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 solution increases electrolyte retention, improves cycling performance, and enhances the appearance flatness of the battery, reducing energy density loss while meeting shipment standards.
Implementation Method 1
a functional layer is disposed in the second region... the functional layer can absorb the electrolyte
Data Source
AI summary
An electrochemical apparatus is provided, including an electrode assembly. The electrode assembly includes an electrode plate, the electrode plate includes a current collector, and the current collector includes a first region and a second region. An active material layer is disposed in the first region, a functional layer is disposed in the second region, and a volume ratio of the functional layer to the active material layer is R, where 1%≤R≤10%. The electrochemical apparatus of this application has a high electrolyte retention amount, a smooth appearance, and a good cycling performance.