Asymmetric Battery Pouch Sealing for PCM and FPCB Clearance
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Solution Overview
Problem
The existing battery designs face interference issues between the supporting bracket and the flexible printed circuit board (FPCB) connected to the protection circuit module (PCM) due to the height of the front sealing part of the pouch, limiting the structure and shape of the FPCB and requiring partial cutting of the bracket, and also result in reduced battery capacity from insulating tape thickness.
Innovation Solution
The battery is designed with an asymmetrical shape for the pouch, specifically forming a lower pouch with a recessed cup and an upper pouch, allowing the front sealing part to be lowered in height, reducing interference with the FPCB and enabling more design freedom for the PCM, while the side sealing part is folded to place insulating and attaching tapes on the same side, minimizing capacity loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the front sealing part is made tall to accommodate the PCM, then the PCM can be properly seated and protected, but interference occurs between the supporting bracket and the FPCB connected to the PCM
Solution Approach 1:
The pouch is designed with an asymmetrical shape where the front sealing part extends to a different height than the rear sealing part. Specifically, the front sealing part has a greater extension length than the rear sealing part, creating an asymmetric profile that allows the PCM to be seated at an optimized height without causing interference with the supporting bracket and FPCB assembly
2Reliability
If the front sealing part height is increased to seat the PCM, then the PCM is properly positioned, but a portion of the supporting bracket must be cut to avoid interference
Solution Approach 1:
The asymmetrical pouch design with differential sealing part heights enables the PCM to be positioned at an optimal height that avoids interference with the supporting bracket, thereby eliminating the need to cut or modify the bracket structure and simplifying the manufacturing process
3Reliability
If insulating tape is added to the sealing part, then electrical insulation is improved, but battery capacity is reduced due to the thickness of the tape
Solution Approach 1:
The insulating and attaching tapes are folded along the sealing part to position them on the same side of the pouch rather than layering them in the thickness direction. This dimensional repositioning reduces the cumulative thickness of tapes, thereby minimizing the reduction in battery capacity while maintaining adequate electrical insulation
Data Source
AI summary
An electronic device according to an embodiment of the disclosure may include a housing. The electronic device may include a battery disposed inside the housing and configured to supply power to the electronic device. The battery may include an electrode assembly. The battery may include an upper pouch and a lower pouch disposed to accommodate the electrode assembly. The battery may include a sealing part formed at edges of the upper pouch and the lower pouch to seal the electrode assembly. The lower pouch may include a first cup recessed downwardly and configured to accommodate at least a portion of the electrode assembly. The first cup may have a front side, a rear side opposite to the front side, and a lateral side connecting the front side and the rear side. The sealing part may include a front sealing part extending from the front side of the first cup and disposed at a lower position than an upper end of the rear side of the first cup.