Rectangular Battery Storage Member for Electrolyte Reduction
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Solution Overview
Problem
Conventional square secondary batteries, such as lithium-ion batteries, require excessive electrolyte to ensure proper impregnation between the power generation element and the battery container, leading to increased volume and potential electrolyte leakage due to the gap between the insulative protection film and the battery container.
Innovation Solution
A square secondary battery design featuring a storage member made of a bag-like insulating sheet with a volume smaller than the battery can, where the electrode group and electrolyte are stored, and an insulating member seals the opening, eliminating the need for extra electrolyte to fill the space between the battery can and the storage member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulative protection film is interposed between the battery container and power generation element, then the electrical insulation is improved, but the gap between the insulative film and battery container requires extra electrolyte
Solution Approach 1:
The invention extracts the problematic outer space between the insulative film and battery container wall from the electrolyte filling region. By designating this outer space as electrolyte-free and using a seal to prevent electrolyte intrusion, the solution maintains the electrical insulation function of the insulative film while eliminating the waste of electrolyte in the non-functional outer space.
Data Source
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AI summary
Provided is a square secondary battery which is capable of reducing the amount of electrolyte compared to the related art. The square secondary battery (100) includes a flat electrode group (40) which is manufactured by winding positive and negative electrodes, a flat square battery can (11) which stores the electrode group (40), a battery lid (12) which seals an opening (11a) of the battery can (11), and an insulating member (3) which is fixed to the battery lid (12) and stored in the battery can (11). The square secondary battery (100) includes a storage member (4) made of a bag-like insulating sheet which has a volume smaller than the battery can (11), is stored in the battery can (11) and stores the electrode group (40) together with the electrolyte. The insulating member (3) adheres to the battery lid (12) to seal a space formed with respect to the battery lid (12), and is bonded to an opening (4a) of the storage member (4) to seal the opening (4a).