Electrolyte Injection Shielding for Electrode Assembly Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In electric storage devices, the direct injection of electrolytic solution can cause damage to the electrode assembly due to direct contact with the electrode tabs, leading to potential material damage and peeling off.
Innovation Solution
The electric storage device incorporates a shielding part between the liquid injection hole and the electrode assembly, ensuring the electrolytic solution does not directly contact the electrode assembly, with an insulating member and a shielding part configuration that guides the solution flow and reduces impact on the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the liquid injection hole is provided on the sealing plate to inject electrolytic solution into the outer case, then the electrolytic solution can be efficiently injected, but the injected electrolytic solution may directly contact the electrode assembly and cause damage to the electrode tabs and laminate surface
Solution Approach 1:
A shielding part is introduced as an intermediary component between the liquid injection hole and the electrode assembly. This shielding part intercepts the electrolytic solution flow and redirects it, preventing direct contact with the electrode tabs and laminate surface while still allowing the electrolyte to be injected into the outer case effectively
Solution Approach 2:
The sealing plate is segmented into functional zones: a liquid injection hole region for electrolyte injection, a current collector attachment region, and a shielding part region. This spatial segmentation allows the liquid injection hole to be positioned independently from the electrode assembly, enabling efficient injection while preventing direct contact through the shielding structure
2Reliability
If the current collector is attached to the sealing plate to electrically connect the electrode assembly and electrode terminal, then electrical connection is achieved, but the attachment portion occupies space that could be used for liquid injection
Solution Approach 1:
The sealing plate is divided into distinct functional regions: a current collector attachment portion for reliable electrical connection, and a separate liquid injection hole portion for electrolyte injection. This segmentation allows both functions to coexist without interference, maintaining electrical reliability while enabling independent liquid injection capability
Solution Approach 2:
The sealing plate utilizes two-dimensional spatial arrangement to resolve the conflict between current collector attachment and liquid injection hole placement. By positioning these features in different locations on the plate surface rather than competing for the same space, both electrical connection reliability and liquid injection functionality are achieved
3Device complexity
If the electrode tab is arranged at the cover side for electrical connection, then the electrical connection structure is simplified, but the laminate surface of the electrode is opposed to the cover, making it vulnerable to direct electrolyte injection
Solution Approach 1:
A shielding part is positioned between the liquid injection hole and the electrode assembly laminate surface to act as a protective intermediary. This shielding structure blocks the direct path of electrolytic solution to the vulnerable laminate surface and electrode tabs, preventing damage while allowing the simplified electrode tab arrangement at the cover side to be maintained
Data Source
AI summary
Provided is a technique decreasing a risk of damaging inside of an electrode assembly by an electrolytic solution injection. The electric storage device includes an electrode assembly, an electrolytic solution, an outer case, a sealing plate, and a current collector. The electrode assembly includes an electrode tab. The outer case includes an opening. The sealing plate is provided with a liquid injection hole. The current collector is attached to the sealing plate, and is electrically connected to the electrode assembly via the electrode tab. On the sealing plate, the liquid injection hole is provided not to overlap with a portion to which the current collector is attached. Between the liquid injection hole and the electrode assembly, a shielding part is provided to inhibit the electrolytic solution injected through the liquid injection hole from directly coming into contact with the electrode assembly.