Wound Cell Tab-to-Lid Welding for Lower Internal Resistance
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Solution Overview
Problem
The presence of a lead plate in conventional power storage devices increases internal resistance, necessitating a reduction in this resistance to improve device efficiency.
Innovation Solution
A direct connection between the current collector and the sealing body is established through a first tab, eliminating the need for an intermediate current collecting ring and lead plate, with a robust welding configuration to minimize resistance and enhance connection strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lead plate and current collecting ring are used to connect current collecting tabs to the battery sealing lid, then the connection structure is established, but the internal resistance of the power storage device is increased
Solution Approach 1:
The invention extracts and eliminates the lead plate from the connection structure. By directly connecting the current collecting tabs to the battery sealing lid through welding without the intermediate lead plate, the unnecessary resistive element is removed, thereby reducing internal resistance while maintaining reliable electrical connection
Solution Approach 2:
The invention merges the current collecting tabs directly with the battery sealing lid through welding. This consolidation eliminates the separate lead plate component and reduces the number of connection interfaces, thereby reducing contact resistance and improving overall electrical conductivity
2Reliability
If multiple connection components (current collecting ring, lead plate) are used, then the connection is established, but the device complexity is increased
Solution Approach 1:
The invention removes the current collecting ring and lead plate from the connection structure, retaining only the essential welding connection between current collecting tabs and the battery sealing lid. This simplification reduces the number of components and assembly steps while maintaining reliable electrical connection
Solution Approach 2:
The invention combines multiple separate connection components into a single integrated welding connection. By directly joining the current collecting tabs to the battery sealing lid, the structure is simplified from multiple discrete parts to a unified connection, reducing device complexity
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 significantly decreases internal resistance and stabilizes the welding process, resulting in a more efficient power storage device with reduced contact resistance and improved connection strength.
Implementation Method 1
the other end of the first tab is welded to the first face of the first member to form a first welding portion
Data Source
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AI summary
A power storage device 10 includes a first electrode 21 having a first current collector, a second electrode 22 having a second current collector, and a separator 23. The first electrode 21, the second electrode 22, and the separator 23 form a columnar wound body 20. The power storage device 10 further includes a cylinder 32, 61 covering an outer periphery of the columnar wound body 20 and having a first opening 31, a sealing body 40 that seals the first opening 31, and at least one first tab 21a, its one end connected to the first current collector and the other end connected to the sealing body 40. The sealing body 40 has a first member 41 including a first face 41a facing away from the columnar wound body 20, and a second member 42 including a second face 42a facing the columnar wound body 20. The other end of the first tab 21a is welded to the first face 41a of the first member 41 to form a first welding portion 43, and the first welding portion 43 is positioned between the first face 41a and the second face 42a. This allows the internal resistance of the power storage device 10 to decrease.