Square Battery Sealing Plate Structure to Block Laser Penetration
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Solution Overview
Problem
Existing square batteries face issues with laser penetration during welding, which can cause thermal damage to the electrode assembly and compromise the integrity of the battery structure.
Innovation Solution
A square battery design featuring a battery case with a rectangular prism shape and sealing plates that are welded together using laser irradiation, where the sealing plates have a cover portion and an inserting portion, preventing laser penetration by diffusing welding heat and forming an 'R' shape at the corners to disperse energy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If laser welding is used to join the sealing plate and case body, then welding strength and airtightness are improved, but laser penetration occurs causing thermal damage to the electrode assembly
Solution Approach 1:
The sealing plate is divided into three functional regions: a cover portion for sealing the opening, an inserting portion extending into the case body to block laser penetration, and a spaced portion creating a gap between the sealing plate and electrode assembly. This segmentation allows the welding process to be strong while protecting internal components from thermal damage.
Solution Approach 2:
The inserting portion of the sealing plate acts as an intermediary element between the laser beam and the electrode assembly. It absorbs and disperses the laser energy through its corner portions, preventing direct laser penetration to the electrode assembly while maintaining welding effectiveness.
2Reliability
If the sealing plate completely covers the opening edge, then sealing performance is improved, but laser penetration into the battery interior occurs during welding
Solution Approach 1:
The sealing plate is segmented into a cover portion for sealing and an inserting portion for laser blocking. The cover portion maintains sealing performance by covering the opening edge, while the inserting portion extends into the case body to prevent laser penetration, with the two portions working together to resolve the contradiction.
Solution Approach 2:
The solution moves from a two-dimensional cover plate to a three-dimensional structure by extending the inserting portion into the case body depth. This dimensional change allows the plate to block laser penetration paths while maintaining sealing function at the opening edge.
3Productivity
If the sealing plate is positioned close to the electrode assembly, then sealing efficiency is improved, but thermal damage to the electrode assembly occurs during welding
Solution Approach 1:
The sealing plate structure separates the sealing function (cover portion) from the laser protection function (inserting portion). The spaced portion creates a protective gap that prevents thermal damage while maintaining sealing efficiency, as the cover portion remains positioned for effective sealing.
Solution Approach 2:
The spaced portion预先 creates a protective gap between the sealing plate and electrode assembly before welding occurs. This cushioning space prevents thermal damage to the electrode assembly during the welding process while maintaining sealing efficiency.
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
Prevents damage to the electrode assembly and shrink film, while ensuring a strong and airtight seal, thereby enhancing the safety and reliability of the battery.
Implementation Method 1
The cover portion and the case body are welded together along the edge of the opening of the battery case
Implementation Method 2
a molten portion formed by welding heat generated in a corner of the battery case
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Provided is a square battery 100 that includes a battery case 10 and an electrode assembly 20 housed in the battery case 10. The battery case 10 includes a case body 12 having a rectangular prism shape with openings 13 at both ends thereof and sealing plates 14 that seal the openings 13. The sealing plate 14 has a cover portion 14a that covers an edge 13a of the opening of the case body 12 and an inserting portion 14b inserted into the interior of the case body 12 from the cover portion 14a along the inside of the case body 12. The cover portion 14a and the case body 12 are welded together along the edge 13a of the opening of the battery case 10.