Battery Pack Metal Case Antenna Integration
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Solution Overview
Problem
Pouch type lithium polymer battery packs are prone to damage from external impacts due to their weak structure, affecting stability and reliability.
Innovation Solution
A battery pack design featuring a metal case surrounding the bare cell and a protection circuit board, with the metal case electrically connected to an antenna pad, providing enhanced strength and functionality as an antenna, while the protection circuit board connects the electrode tabs to ensure robustness and communication functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a pouch type bare cell is used in a polymer battery pack, then the battery pack can be manufactured with simpler materials and processes, but the battery pack becomes weak and easily damaged by external impacts
Solution Approach 1:
The patent applies composite materials by combining the pouch type bare cell with a metal case (steel or stainless steel) to create a hybrid structure. This composite construction integrates the manufacturing advantages of pouch cells with the mechanical strength of metal, resolving the contradiction between ease of manufacture and impact resistance.
Solution Approach 2:
The metal case serves multiple functions: it provides mechanical protection against impacts, acts as a shield for the bare cell, and functions as an antenna for communication devices. This multi-functionality allows the structure to address both structural weakness and manufacturing simplicity while adding communication capability.
2Strength
If a metal case is added to protect the bare cell, then the strength against external impact is enhanced, but the device complexity increases
Solution Approach 1:
The metal case is designed to perform multiple functions simultaneously: mechanical protection, shielding, and antenna functionality. By integrating these functions into a single component, the patent avoids adding separate structures for each function, thereby limiting the increase in device complexity while achieving enhanced impact resistance.
Solution Approach 2:
The patent merges the protective case structure with the antenna function by electrically connecting the metal case to the antenna pad on the protection circuit board. This consolidation reduces the number of separate components and simplifies the overall device structure despite adding protective capabilities.
3Reliability
If the metal case is electrically connected to the antenna pad, then the communication device performance is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The metal case itself serves as the electrical connection element for the antenna function. By using the case's inherent conductivity and structure as the antenna element, the patent eliminates the need for separate antenna components and reduces the precision requirements for additional electrical connections, while still achieving improved communication performance.
Data Source
AI summary
A battery pack including a bare cell, a metal case covering the outer surface of the bare cell, and a protection circuit board electrically connected to the metal case.