Secondary Battery Electrode Assembly Layout Against Separator Curling
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Solution Overview
Problem
Secondary batteries used in electric vehicles and hybrid electric vehicles face short-circuiting issues due to curling of separators during electrolyte solution introduction, which can cause contact between positive and negative electrode plates, leading to potential short-circuits.
Innovation Solution
The secondary battery design includes insulating sheets and tapes on the electrode assemblies adjacent to the sealing plate, with the tapes facing the electrolyte introduction hole to prevent separator curling and ensure proper alignment, thereby preventing short-circuiting between the positive and negative electrode plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If electrolytic solution is introduced through the electrolytic solution introduction hole in the sealing plate, then the battery can be filled with electrolyte, but the separator may curl causing short-circuiting between electrode plates
Solution Approach 1:
The patent applies preliminary action by providing insulating sheets and tapes on the electrode assemblies before electrolytic solution introduction. These protective elements are pre-positioned to prevent separator curling from the outset, rather than attempting to correct curling after it occurs during electrolyte filling
Solution Approach 2:
The patent uses insulating sheets and tapes as intermediary elements between the electrolytic solution introduction process and the separator. These intermediaries absorb or redirect the harmful effects of solution introduction that would otherwise cause separator curling, protecting the electrode assembly structure
2Device complexity
If the stacked end portion of the electrode assembly is disposed adjacent to the sealing plate, then the structure is compact, but separator curling occurs during electrolyte introduction causing electrode plate contact
Solution Approach 1:
The patent applies local quality by providing protective insulating sheets and tapes specifically at the stacked end portion adjacent to the sealing plate, rather than uniformly throughout the entire electrode assembly. This localized protection addresses the specific vulnerability area where separator curling occurs during electrolyte introduction
Data Source
AI summary
A secondary battery includes a rectangular exterior body having an opening and containing a first electrode assembly and a second electrode assembly, a sealing plate sealing the opening, and a positive-electrode current collector. The sealing plate has an electrolytic solution introduction hole. The first electrode assembly includes a first insulating sheet on an outermost surface thereof adjacent to the second electrode assembly. The second electrode assembly includes a second insulating sheet on an outermost surface thereof adjacent to the first electrode assembly. A first tape is attached to both an outermost surface of a first positive-electrode tab group and the first insulating sheet. A second tape is attached to both an outermost surface of a second positive-electrode tab group and the second insulating sheet. At least one of the first tape and the second tape is located to face the electrolytic solution introduction hole.