Battery Cell Injection Hole Layout to Protect Positive Electrode Tabs
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Solution Overview
Problem
The positive electrode tab in electrical energy storage devices is prone to damage during electrolyte solution injection, particularly in high-capacity or large-sized batteries, due to its softer and more deformable nature compared to the negative electrode tab.
Innovation Solution
The liquid injection hole is positioned closer to the negative electrode tab than to the positive electrode tab, reducing direct contact and damage during electrolyte solution injection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the liquid injection hole is provided near the positive electrode tab to facilitate electrolyte solution injection, then the injection process is simplified, but the positive electrode tab is damaged due to its softer and more deformable nature
Solution Approach 1:
The patent applies asymmetry by positioning the liquid injection hole closer to the negative electrode tab than to the positive electrode tab. This asymmetric arrangement exploits the difference in mechanical properties between the two tabs, directing the injection force away from the more vulnerable positive electrode tab while maintaining effective electrolyte distribution throughout the battery.
2Productivity
If a large amount of electrolyte solution is injected at one time through the liquid injection hole to meet high-capacity battery requirements, then the production efficiency is improved, but the positive electrode tab damage is exacerbated
Solution Approach 1:
The patent uses the negative electrode tab as an intermediary structure that absorbs and redirects the injection force. By positioning the injection hole near the negative electrode tab, the force is applied to this more robust component first, which then distributes the electrolyte throughout the battery without transmitting damaging forces to the positive electrode tab.
3Reliability
If the liquid injection hole is positioned closer to the negative electrode tab, then the positive electrode tab damage is reduced, but the injection process may become more complex
Solution Approach 1:
The patent applies local quality by creating a localized favorable injection zone near the negative electrode tab. This localized approach concentrates the injection force where it is most effective and least harmful, while the rest of the battery structure remains unchanged, avoiding unnecessary complexity in the overall injection system design.
Data Source
AI summary
An electrical energy storage device disclosed herein includes a square case having a pair of third surfaces, an electrode body including a positive electrode and a negative electrode, a positive electrode tab that is provided in the positive electrode, a negative electrode tab that is provided in the negative electrode, an electrolyte solution, and a liquid injection hole that is provided at the third surface of the case and at a position closer to the negative electrode tab than to the positive electrode tab.