Battery Module Connecting Assembly With Through-Hole Insulation
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Solution Overview
Problem
The insulating film in battery modules is prone to tearing due to the expanding force of battery cells during charging and discharging, leading to a risk of short circuits and reduced safety performance.
Innovation Solution
A connecting assembly with connecting sheets featuring an adjusting portion as a protrusion and an insulating film with through holes corresponding to the adjusting portion, which enhances the ductility of the insulating film and prevents it from being torn, thereby reducing the risk of short circuits and improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating film is paved on the connecting sheet without through holes, then the insulating film provides continuous insulation, but the insulating film is torn under the expanding force of battery cells during charging and discharging
Solution Approach 1:
The insulating film is segmented by introducing through holes that divide the film into multiple regions. These through holes allow the insulating film to expand and contract with the battery cells during charging and discharging without tearing, while still maintaining insulation between adjacent connecting sheets.
Solution Approach 2:
The insulating film is designed with a porous structure containing through holes. This porous design enables the film to accommodate the volume changes of battery cells during operation, preventing film rupture while maintaining its insulating function through the remaining material structure.
2Strength
If the insulating film is made rigid to prevent tearing, then the insulating film maintains structural integrity, but the manufacturing efficiency of the connecting assembly is reduced
Solution Approach 1:
The physical parameters of the insulating film are changed by introducing through holes, which modify its mechanical properties. The film becomes more flexible and adaptable to battery cell expansion while maintaining insulation, thereby improving both reliability and manufacturability.
3Strength
If through holes are added to the insulating film to accommodate the adjusting portion, then the ductility of the insulating film is enhanced and tearing is prevented, but the insulation continuity is compromised
Solution Approach 1:
The insulating film is segmented by through holes into multiple insulating regions that remain electrically isolated. Each segment maintains insulation locally, and the overall structure prevents short circuits between adjacent connecting sheets while allowing film flexibility.
Solution Approach 2:
The through holes act as intermediaries that allow mechanical expansion while maintaining electrical insulation. The holes provide space for adjusting portions and accommodate battery cell expansion without compromising the insulating function of the remaining film material.
Data Source
AI summary
The present application discloses a connecting assembly, a battery module, a battery pack, and a device using the battery module as a power supply. The connecting assembly includes a plurality of connecting sheets and an insulating film, where each of the plurality of connecting sheets includes an adjusting portion and a connecting portion, the adjusting portion is configured as a protrusion connected between adjacent connecting portions, the connecting portion is configured to connect a battery cell of the battery module, and the insulating film is disposed on one side of each of the plurality of connecting sheets, and the insulating film is provided with a through hole disposed corresponding to the adjusting portion. Through the solutions in the present application, the problem that the insulating film is wrinkled and torn due to the protrusion is avoided, and the manufacturing efficiency of the connecting assembly can be improved.