Cylindrical Battery Pack Side-Circuit Structure for Lower Height
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Solution Overview
Problem
Existing battery pack configurations for small devices, such as wireless earphones, face challenges in reducing the height of the battery pack while maintaining structural integrity and heat dissipation, as components are typically arranged in a thickness direction, making it difficult to minimize the device's size effectively.
Innovation Solution
A battery pack design featuring a cylindrical secondary battery with a circuit board mounted on its circumferential side surface, utilizing a flexible printed substrate with circuit components and a reinforcing portion to reduce height, and incorporating a battery holder to support the battery, allowing the circuit components to face inward and be thermally coupled with the battery's metal surface for effective heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If components are arranged in a thickness direction to maintain structural integrity, then the battery pack height increases, but height reduction is required for small devices
Solution Approach 1:
The patent transitions component arrangement from the thickness direction (vertical stacking) to the radial direction (circumferential arrangement around the battery). The circuit board is disposed to extend in the radial direction with circuit components mounted on its surface, allowing components to be distributed around the battery's circumference rather than stacked vertically, thereby reducing battery pack height while maintaining structural integrity.
2Length of moving object
If a flexible printed substrate is used to reduce height, then mechanical stress resistance decreases, but reinforcing portions are needed to prevent peeling and breakage
Solution Approach 1:
The patent combines the flexible printed substrate with reinforcing portions made of rigid material to create a composite structure. The reinforcing portions are integrated with the circuit board at locations susceptible to mechanical stress, providing enhanced strength and resistance to peeling and breakage while the flexible substrate maintains the low-height configuration.
3Temperature
If circuit components are mounted on the circuit board surface, then heat dissipation is improved, but thermal coupling with the battery needs to be optimized
Solution Approach 1:
The patent implements thermal coupling structures at specific locations where circuit components are mounted on the circuit board. These localized thermal coupling structures facilitate heat transfer from the circuit components to the battery, optimizing heat dissipation efficiency while ensuring reliable thermal coupling at the critical interfaces between components and the battery.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces the battery pack's height, minimizes mechanical stress on the circuit components, and enhances heat dissipation, preventing peeling and breakage due to external impacts, while maintaining the structural integrity and operational efficiency.
Implementation Method 1
allowing the circuit components to face inward and be thermally coupled with the battery's metal surface for effective heat dissipation
Data Source
AI summary
Provided is a battery pack including: a battery including an electrode portion and having a cylindrical shape; and a circuit board disposed on a circumferential side surface of the battery, in which the circuit board includes a circuit component mounting portion and a wiring part, the circuit component mounting portion includes a reinforcing portion, and the wiring part includes a flexible printed substrate.