Cylindrical Battery Multiple Tabs Gas Vent Guide
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional cylindrical batteries face issues with cell deformation due to gas generation during charging and discharging, leading to increased internal pressure and resistance in electrode connections.
Innovation Solution
A method for manufacturing a cylindrical battery with multiple tabs, involving electrode tabs protruding at the upper end, a gas collecting part, and a guide part in the pouch case to prevent deformation and reduce resistance by efficiently managing gas and connecting electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid structure case is used in conventional cylindrical batteries, then structural strength is improved, but gas removal becomes difficult leading to increased internal pressure
Solution Approach 1:
The rigid case is segmented by introducing a gas vent hole that allows the case to be divided into sealed regions and a gas venting region. This segmentation enables the case to maintain structural strength while providing a dedicated pathway for gas removal, resolving the contradiction between structural integrity and gas venting capability.
2Reliability
If multiple electrode tabs are used, then resistance in electrode connection is reduced, but device complexity increases
Solution Approach 1:
Multiple electrode tabs are merged into a single integrated tab structure at the end of the wound electrode assembly. This combining approach maintains the low-resistance benefit of multiple connection points while simplifying the overall structure by eliminating the need for separate tabs, thus reducing device complexity.
3Ease of manufacture
If electrode leads are welded to the outer case in conventional batteries, then connection is simplified, but resistance increases
Solution Approach 1:
The electrode connection point is extracted from the outer case and repositioned to the end of the electrode assembly where multiple tabs are naturally formed. This extraction allows welding to occur at the optimized tab location rather than at the case, maintaining manufacturing simplicity while achieving lower resistance through the multi-tab configuration.
4Quantity of substance
If the battery cell expands during charging and discharging, then capacity is improved, but deformation occurs due to gas generation
Solution Approach 1:
A gas venting mechanism acts as an intermediary between the expanding electrode assembly and the rigid case. The gas vent hole and associated structure mediate the pressure buildup by providing a controlled release pathway, allowing the cell to expand during charging/discharging without deforming the overall battery shape.
Data Source
AI summary
A method for manufacturing a cylindrical battery having multiple tabs is provided in which the cylindrical battery includes an electrode assembly, a cylindrical pouch case, an electrode tab protruding to an upper end of the electrode assembly, and an electrode lead welded and electrically connected to the electrode tab, with the electrode tab being plural. The method includes disposing the plurality of electrode tabs on the electrode assembly; winding the electrode assembly into a cylindrical shape; connecting the electrode lead to the plurality of electrode tabs disposed on the upper end of the electrode assembly; inserting the electrode assembly into the cylindrical pouch case to produce a battery cell; connecting, to the cylindrical pouch case, a gas collecting part for collecting gas generated due to charging and discharging of the electrode; and forming a guide part for preventing deformation of the battery cell in the cylindrical pouch case.