Battery Lid Structure to Prevent Electrolyte Sealing Defects
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Solution Overview
Problem
Batteries often experience welding defects due to electrolyte solution residue during the sealing process, which can compromise the integrity of the battery pack.
Innovation Solution
A battery design featuring an electrode group holder with an opening extending across positions corresponding to the liquid inlet and gas discharge valve, preventing electrolyte solution residue and facilitating uniform electrolyte impregnation, thereby reducing the likelihood of welding defects during sealing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lid is sealed after electrolyte solution injection, then the battery is closed and ready for use, but welding defects occur due to electrolyte solution remaining in the vicinity of the sealing portion
Solution Approach 1:
The gas discharge valve is designed with a thin-walled structure that protrudes into the container interior, creating a groove that actively extracts and discharges electrolyte solution from the sealing vicinity before the sealing process occurs, preventing residue accumulation
Solution Approach 2:
The gas discharge valve performs preliminary discharge of electrolyte solution from the sealing area before the actual sealing operation takes place, ensuring the vicinity is clear of harmful residues that would cause welding defects
2Quantity of substance
If electrolyte solution is injected through the liquid inlet, then the battery is filled with electrolyte, but welding defects are caused by solution remaining near the sealing area
Solution Approach 1:
The gas discharge valve acts as an intermediary structure between the liquid inlet and the sealing portion, using its thin-walled groove design to intercept and redirect electrolyte solution flow away from the sealing area, allowing complete filling while preventing residue accumulation
Data Source
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AI summary
According to one embodiment, a battery includes an electrode group, a container, a lid, a pair of electrode terminals, electrode group holder. The electrode group is housed in the container, and the lid covers an opening of the container. The lid includes a gas discharge valve, a liquid inlet is formed in the lid. The electrode terminals are attached to an outer surface of the lid. The electrode group holder is provided between the lid and the electrode group inside the container, and stacked together with the lid. An open hole penetrating through the electrode group holder is formed across an area facing the gas discharge valve and an area facing the liquid inlet.