Laminated Battery End Structure to Prevent Current Collector Cutting
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Solution Overview
Problem
Existing battery manufacturing methods result in sagging portions of electrode active material layers, leading to reduced volume efficiency and potential cutting of the first current collector layer during sagging portion removal, which compromises the battery's structural integrity.
Innovation Solution
A battery design that includes a laminate structure with a hard member at one end, where the tips of the electrode active material layers and electrolyte layer are positioned inside the hard member, and the angle between the tangential direction of the second electrode active material layer and the surface direction of the first current collector layer is between 60° and 120°, preventing the cutting of the first current collector layer during sagging portion removal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the sagging portion of electrode active material layers is removed to improve volume efficiency, then the volume efficiency is improved, but the first current collector layer may be cut, compromising structural integrity
Solution Approach 1:
The patent applies preliminary action by forming a protective coating layer on the first current collector layer before the electrode active material layers are applied. This protective layer is formed in advance to prevent cutting of the current collector layer during subsequent sagging portion removal operations, thus resolving the contradiction between volume efficiency improvement and structural integrity maintenance
2Ease of manufacture
If the electrode mixture slurry coating film is coated to form electrode active material layers, then the battery can be manufactured, but sagging portions are generated at the end portions, reducing volume efficiency
Solution Approach 1:
The protective coating layer is formed preliminarily on the current collector layer before electrode mixture slurry coating. This preliminary protective layer prevents sagging portion generation at the end portions during the coating and drying process, thereby maintaining volume efficiency while preserving ease of manufacture
Solution Approach 2:
The protective coating layer acts as an intermediary between the current collector layer and the electrode mixture slurry. This intermediary layer prevents direct contact and adhesion of the slurry to the current collector at the edges, eliminating sagging portion formation while maintaining the manufacturability of the battery
Data Source
AI summary
A battery with a laminate has a first current collector layer, a first electrode active material layer, an electrolyte layer, and a second electrode active material layer laminated in this order, and at least one end of the laminate is in contact with a hard member, wherein tips of the first electrode active material layer, the electrolyte layer, and the second electrode active material layer are present inside the tip of the hard member, and a second surface of the hard member is in contact with the first electrode active material layer and/or between the surface of the second electrode active material layer and the first contact surface of the first current collector layer. An angle between a tangential direction at a tip of the second electrode active material layer and a surface direction of the first current collector layer is 60° or more and 120° or less.