Battery Case Protrusion Around Injection Hole for Seal Integrity
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Solution Overview
Problem
Batteries, particularly high-capacity or large-size batteries used as power sources, experience deformation and damage at the electrolytic solution injection hole due to increased internal pressure from electrolyte volatilization during charging and discharging, leading to potential breakage of the connection between the battery case and the sealing member.
Innovation Solution
A protrusion is provided on the battery case surface near the electrolytic solution injection hole to increase rigidity, preventing deformation and enhancing the connection between the battery case and the sealing member, which is sealed using a sealing member connected to the peripheral edge of the injection hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large-capacity battery is used to increase power output, then the battery can provide higher energy storage and power, but the internal pressure increases causing deformation and damage at the electrolytic solution injection hole
Solution Approach 1:
The patent applies local quality by providing a reinforcement structure specifically at the electrolytic solution injection hole area rather than uniformly strengthening the entire battery case. This localized reinforcement addresses the specific weakness at the injection hole where deformation occurs under high internal pressure, while maintaining the overall large-capacity design of the battery.
2Quantity of substance
If the battery case size is increased to accommodate high-capacity electrodes, then more energy can be stored, but the closing plate deforms and the sealing connection becomes vulnerable
Solution Approach 1:
The patent applies preliminary action by pre-installing the reinforcement structure on the battery case before the sealing process. This reinforcement structure is prepared in advance to prevent deformation of the closing plate during subsequent sealing operations, ensuring reliable sealing connection from the outset rather than attempting to correct deformation after it occurs.
3Use of energy by moving object
If internal pressure increases due to electrolyte volatilization during charging and discharging, then the battery can handle higher operational demands, but deformation and breakage occur at the sealing connection
Solution Approach 1:
The patent applies beforehand cushioning by providing a reinforcement structure that acts as a buffer or cushion against the harmful effects of internal pressure. This reinforcement structure absorbs and distributes the stress caused by electrolyte volatilization and pressure increases during charging and discharging, preventing direct transmission of harmful forces to the sealing connection at the electrolytic solution injection hole.
Data Source
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AI summary
A battery (100) disclosed herein includes: an electrode body (20a) including a positive electrode and a negative electrode; an electrolytic solution; a battery case (10) housing the electrode body (20a), storing the electrolytic solution, and including an electrolytic solution injection hole (15); and a sealing member (16) connected to a portion of the battery case (10) defining a peripheral edge of the electrolytic solution injection hole (15), such that the electrolytic solution injection hole (15) is sealed with the sealing member (16). A surface (14d) of the battery case (10) facing the electrode body (20a) includes a protrusion (14a) located around the electrolytic solution injection hole (15) and protruding toward the electrode body (20a).