Battery Pack PCB Fixing Structure for Stable FPC Connection
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Solution Overview
Problem
Existing battery packs face reliability issues due to unstable fixation of flexible printed circuit boards, which can lead to electrical connectivity problems and manufacturing complexities.
Innovation Solution
Incorporating a molding part with a fixing part that securely inserts and connects the flexible printed circuit board to the protection circuit module, eliminating the need for separate adhesives and enhancing board stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate adhesive member or adhesive tape is used to attach the flexible printed circuit board to the protection circuit module, then the circuit board can be connected, but the fixation is unstable and reliability is reduced
Solution Approach 1:
The patent merges the adhesive attachment function into the molding part itself by forming a fixing part with opening structures directly during the molding process. This eliminates the need for separate adhesive members or tapes, providing stable fixation through the integrated structural design of the molding part that mechanically engages with the flexible printed circuit board.
Solution Approach 2:
The molding part provides self-fixation capability through its own structure by incorporating opening structures (first opening, second opening, and connection passage) that directly secure the flexible printed circuit board. The molding part serves its own fixation need without requiring external adhesive components, achieving reliable attachment through its inherent geometric design.
2Ease of manufacture
If separate adhesive members are used to fix the flexible printed circuit board, then connection is achieved, but manufacturing complexity increases and costs rise
Solution Approach 1:
The patent combines multiple functions into the molding part: structural protection, electrical insulation, and mechanical fixation. The fixing part with opening structures is formed integrally with the molding part during the molding process, eliminating the need for separate adhesive members and reducing the total component count while simplifying the manufacturing process.
Solution Approach 2:
The fixation structures (opening structures) are pre-formed as integral parts of the molding part during the molding process itself, before assembly. This preliminary formation of fixing features eliminates the need for separate attachment steps and components, streamlining manufacturing and reducing assembly complexity.
3Reliability
If adhesive tape is used to attach the flexible printed circuit board, then electrical connection is established, but additional materials and costs are required
Solution Approach 1:
The patent eliminates the need for separate adhesive materials by integrating the fixation function into the molding part's structure. The opening structures provide mechanical engagement and stable fixation without requiring additional adhesive substances, reducing material usage while maintaining reliable electrical connectivity through secure positioning.
Data Source
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AI summary
A battery pack includes a battery cell; an electrode tab coupled to the battery cell; a protection circuit module electrically connected to the battery cell that includes a circuit board and a molding part covering the circuit board; and a flexible printed circuit board electrically connected to the protection circuit module. The molding part includes a fixing part to which the flexible printed circuit board is fixed.