Battery Cover Structure With Split Electrode Covers for Weld Quality
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Solution Overview
Problem
The existing 4680 cylindrical battery design faces issues with low space utilization and faulty soldering due to the placement of negative electrode covers, which are made thick to prevent damage, leading to inefficient production and potential electrical connection problems.
Innovation Solution
A battery cover structure with a first cover, a second cover, and a third cover, where the second and third covers have a height difference and are connected through an insulator, allowing for efficient electrical connections and improved space utilization by locating positive and negative electrodes at the same end, thus preventing faulty soldering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the negative electrode cover is made thick to prevent penetration when welding to external busbar, then the protective function is improved, but the welding quality when connecting to internal current collector piece or tab deteriorates due to faulty soldering
Solution Approach 1:
The electrode cover is divided into two separate covers: a first electrode cover for welding to the external busbar and a second electrode cover for welding to the internal current collector piece or tab. This segmentation allows each cover to have optimized thickness for its specific welding application, resolving the contradiction between protective function and welding quality.
2Reliability
If the negative electrode cover is welded to both external busbar and internal current collector piece or tab, then the electrical connection is improved, but the space utilization deteriorates due to low battery space utilization
Solution Approach 1:
The patent positions both the first electrode cover and second electrode cover at the same end of the battery, utilizing the dimensional space efficiently. This arrangement allows both electrical connections to be made without increasing the overall battery volume, resolving the contradiction between electrical connection reliability and space utilization.
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 enhances space utilization, prevents faulty soldering, and improves production efficiency by allowing for efficient electrical connections without the need for angle positioning of electrodes, while maintaining operational safety and reliability.
Implementation Method 1
the insulator is configured to insulate and isolate the first cover from the second cover, and insulate and isolate the first cover from the third cover
Data Source
AI summary
The present disclosure belongs to the technical field of batteries, and specifically relates to a battery cover structure, including: a first cover, a second cover, a third cover and an insulator; the first cover is provided with a first through hole, and the second cover and the third cover are connected and arranged in the first through hole, the insulator is arranged between the first cover and the second cover and between the first cover and the third cover, and the second cover is configured for being electrically connected to an outside, and the third cover is configured for being electrically connected to a first tab; and the second cover and the third cover have the height difference in the first direction, and each of the second cover and the third cover is provided with a welding region.