Secondary Battery Electrode Tab Pad Plate Welding Isolation
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Solution Overview
Problem
In secondary batteries, the welding imprint generated during assembly can damage the electrode assembly or electrode tab, affecting battery performance and service life.
Innovation Solution
A strip-shaped electrode tab pad plate is placed between the top cover and the electrode assembly, with a connecting part beneath and a welding part above, bypassing the pad plate to prevent damage from welding imprints, and an anti-explosion valve and screen net are arranged to enhance safety and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode tab is connected to the electrode terminal through welding, then the electrical connection is reliable, but the welding imprint damages the electrode assembly or electrode tab
Solution Approach 1:
The patent introduces an electrode tab pad plate as an intermediary component between the electrode tab and the electrode terminal. The pad plate receives the welding operation on its surface while the electrode tab connects to the terminal through this protective intermediary, preventing direct contact between the welding imprint and the electrode tab, thus maintaining electrical connection reliability while avoiding damage
Solution Approach 2:
The patent segments the electrode tab structure into distinct functional parts: the connecting part that attaches to the electrode assembly, the folding part that routes the connection, and the welding part that connects to the terminal. The pad plate is positioned to specifically protect the welding part, allowing the different segments to perform their specialized functions while isolating the vulnerable welding area from direct imprint contact
2Object-affected harmful factors
If the electrode tab pad plate is placed between the top cover and the electrode assembly, then the welding imprint is isolated from the electrode tab, but the device structure becomes more complex
Solution Approach 1:
The electrode tab pad plate serves multiple functions simultaneously: it provides a protective surface for welding operations, acts as a structural support element, maintains the positional relationship between components, and prevents welding imprint damage. By consolidating these functions into a single component, the patent achieves welding imprint isolation without proportionally increasing device complexity
Data Source
AI summary
The secondary battery of the present invention includes: a top cover, a first electrode terminal, a second electrode terminal, an electrode-tab pad-plate, an electrode assembly, a first electrode-tab and a second electrode-tab; the first and second electrode terminal are arranged on the top cover, the electrode-tab pad-plate is a strip-plate shaped structure, and is located between the top cover and electrode assembly, the first electrode-tab includes a connecting part, a folding part and a welding part, the connecting part is beneath the electrode tab pad plate, the welding part is above the electrode tab pad plate, and the connecting part is connected with the electrode assembly, the welding part is connected with the first electrode terminal, the folding part is connected with the connecting part and welding part bypassing the electrode-tab pad-plate; the second electrode terminal is connected with the electrode assembly through the second electrode-tab.