Wound Electrode Body Separator Fixing Without Stop Tape
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Solution Overview
Problem
The configuration of electrode production apparatuses for wound electrode bodies is complicated by the mechanism required for fixing the winding terminal edge of separators, necessitating a simpler and more convenient method for producing wound electrode bodies.
Innovation Solution
A battery design incorporating a strip-shaped positive electrode and negative electrode wound around a separator with a second separator extending beyond the winding terminal edge of a first separator, bonded with an adhesive layer, and featuring a heat-resistant layer on the outermost surface, allowing for the omission of winding terminal stop tapes and simplification of the production process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a winding terminal stop tape mechanism is used to fix the winding terminal edge of the separator, then the separator can be securely fixed to the wound body, but the configuration of the electrode production apparatus becomes complicated
Solution Approach 1:
The invention extracts and eliminates the winding terminal stop tape mechanism from the electrode production apparatus. Instead of using an external fixing mechanism, the separator itself is designed with an extending portion that naturally extends beyond the winding terminal edge of the first separator, allowing the second separator to be bonded directly to the wound body surface without requiring additional fixing components or complex mechanisms.
Solution Approach 2:
The separator structure serves its own fixing function through the extending portion design. The second separator's extending portion automatically contacts and bonds to the outermost surface of the wound body, enabling the separator to fix itself without external assistance from complex apparatus mechanisms.
2Reliability
If a winding terminal stop tape is used to fix the separator, then the winding terminal edge can be securely attached, but the production process becomes less convenient and more complex
Solution Approach 1:
The invention removes the winding terminal stop tape from the production process. The extending portion of the second separator is designed to naturally extend beyond the first separator's winding terminal edge, enabling direct bonding to the wound body without requiring stop tapes or complex attachment mechanisms, thereby simplifying the manufacturing process.
Solution Approach 2:
Instead of using an external tool (winding terminal stop tape) to fix the separator, the invention inverts the approach by making the separator itself (through its extending portion) the fixing element that directly bonds to the wound body, reversing the traditional fixation methodology.
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
This design effectively fixes the winding terminal edge of the separator without the need for complex mechanisms, enabling the production of wound electrode bodies in a more straightforward and efficient manner, thereby simplifying the electrode production apparatus and improving manufacturing convenience.
Implementation Method 1
at least a part of the extending portion and a region positioned inward from the extending portion in the second separator are bonded together with a second adhesive layer existed on a surface of the second separator
Data Source
AI summary
Provided is a technique that can obtain a wound electrode body simply and conveniently. One aspect of a battery herein disclosed is provided with a wound electrode body in which a strip-shaped positive electrode and a strip-shaped negative electrode are wound around in a predetermined winding direction around a winding axis via a strip-shaped separator. The second separator includes a region positioned outward from a winding terminal edge of the first separator; the second separator includes an extending portion extending beyond the winding terminal edge of the first separator in the winding direction; at least a part of the extending portion and a region positioned inward from the extending portion in the second separator are bonded together with a second adhesive layer existed on a surface of the second separator; and a heat-resistant layer is existed on an outermost surface of the wound electrode body.