Secondary Battery Electrode Lead Nesting for Volume Reduction
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Solution Overview
Problem
Conventional secondary batteries have a reduced capacity per unit volume due to the protruding electrode leads, which increase the overall volume of the battery.
Innovation Solution
The secondary battery design includes an electrode assembly with electrode leads that have an insulation part surrounded by an exterior and an exposure part not covered by the exterior, with the exposure part disposed inside the insulation part, allowing for a connection part within the sealing part and through-holes in the exterior and insulation member to minimize protrusion and maximize capacity per volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode lead includes external connection part and internal connection part that protrude from the boundary of the secondary battery, then the electrical connection to external devices is achieved, but the overall volume of the secondary battery increases
Solution Approach 1:
The electrode lead structure is designed such that the external connection part is positioned inside the sealing part of the exterior, creating a nested arrangement where the connection components are contained within the battery boundary rather than protruding outward. This nesting eliminates the need for separate internal and external connection parts that would increase volume.
Solution Approach 2:
The patent merges the functions of the external connection part and internal connection part into a single integrated electrode lead structure. The lead serves both as the internal connection to the electrode assembly and as the external connection to external devices, eliminating the need for separate protruding components and reducing overall battery volume.
2Reliability
If the internal connection part protrudes to the inner space of the secondary battery, then the electrical connection to the electrode assembly is achieved, but the electrode assembly size is reduced and battery capacity is reduced
Solution Approach 1:
The electrode lead is positioned such that the connection part is located inside the sealing part of the exterior, creating a nested arrangement that allows the lead to connect to the electrode assembly without occupying significant inner space. This positioning enables the electrode assembly to maintain its full size and capacity.
3Ease of operation
If the external connection part protrudes to the outer space of the secondary battery, then the connection to external devices is achieved, but the overall volume of the secondary battery increases
Solution Approach 1:
The external connection part is positioned inside the sealing part of the exterior, creating a nested arrangement where the connection components are contained within the battery boundary. This allows external devices to connect to the battery through the sealing part without requiring the connection part to protrude to the outer space, thereby maintaining a compact battery volume.
Data Source
AI summary
Disclosed are a secondary battery and a method for manufacturing the same. According to the present invention, since an external protrusion protruding from the outside of an exterior constituting a body of the secondary battery as a component through which a secondary battery according to a related art is electrically connected to external electric equipment is removed, the secondary battery may be reduced in volume under the same capacity.