Top Pressing Plate Groove Structure for Battery Tab Protection
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Solution Overview
Problem
Secondary batteries experience electrode tab breakage due to vibration-induced movement within the battery case, leading to potential safety hazards and reduced reliability.
Innovation Solution
A top pressing plate is introduced between the insulating separator and the main body portion of the electrode assembly, featuring accommodating grooves to house the welding end portions of the electrode tabs, which limits the movement of the main body portion and prevents tab bending and breakage, while also isolating the welding region from the main body to prevent scratching or abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode assembly is housed in the case without additional restraint structures, then the device complexity is reduced, but the electrode tabs are susceptible to breakage due to vibration-induced movement
Solution Approach 1:
The top pressing plate serves as an intermediary component between the electrode assembly and the case. It features an accommodating groove that houses the welding end portion of the electrode tab, acting as a mediator that prevents direct contact between the vulnerable welding region and the main body of the electrode assembly, thereby reducing breakage without requiring complex restraint mechanisms
Solution Approach 2:
The top pressing plate divides the protection function into distinct segments: the accommodating groove specifically protects the welding end portion, while the main body of the plate restrains the electrode assembly. This segmentation allows targeted protection of the most vulnerable area without over-engineering the entire structure
2Object-affected harmful factors
If the welding end portion is exposed without accommodation, then the manufacturing process is simpler, but the welding region may scratch or abrade the main body portion during vibration
Solution Approach 1:
The top pressing plate with its accommodating groove acts as a physical barrier and intermediary structure that isolates the welding end portion from the main body portion. This groove-based accommodation prevents the welding region from scratching or abrading the main body during vibration, addressing the harmful effect without requiring complex protective mechanisms
Solution Approach 2:
The accommodating groove is designed beforehand to house the welding end portion, providing pre-established protection against scratch and abrasion. This prior cushioning approach prevents potential damage before it occurs, rather than requiring complex reactive protection systems
Data Source
AI summary
This application relates to a top pressing plate, a secondary battery, and a method for manufacturing a secondary battery. The top pressing plate is used for a secondary battery, the secondary battery including a top cover sheet, an insulating separator and an electrode assembly, the electrode assembly including a main body portion and electrode tabs connected to the main body portion, the electrode tabs each including a welding end portion, the top pressing plate includes: a first surface and a second surface provided oppositely in a thickness direction of the top pressing plate and an accommodating groove recessed from the second surface toward the first surface, the top pressing plate can be provided between the insulating separator and the main body portion, the first surface faces the main body portion, the second surface faces the insulating separator, and the accommodating groove is disposed to accommodate the welding end portion.