Pouch Battery Pack Circuit Layout for Thin Thermal Protection
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Solution Overview
Problem
Existing battery packs lack efficient miniaturization and control mechanisms for battery cells, leading to suboptimal volumetric efficiency and energy utilization.
Innovation Solution
A battery pack design incorporating a flexible circuit board with a protection circuit module, including a controller, protection element, and molding portion, arranged on a terrace of a pouch to minimize thickness and enhance thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a rigid circuit board is used for the protection circuit module, then structural stability is improved, but volumetric efficiency deteriorates due to increased thickness
Solution Approach 1:
The patent replaces the rigid circuit board with a flexible circuit board that has a thickness of 0.1mm to 0.5mm, dramatically reducing the thickness compared to conventional rigid boards. The flexible circuit board maintains electrical connectivity and structural integrity through its flexibility, allowing it to conform to the pouch battery shape while providing necessary mechanical support and electrical pathways for the protection circuit.
2Volume of moving object
If the protection circuit module is miniaturized, then volumetric efficiency is improved, but thermal management capability deteriorates
Solution Approach 1:
The patent applies local quality by positioning the molding portion specifically at the protection element location, creating a localized thermal management solution. The molding portion with thermal conductivity of 1.0 W/m·K or higher is strategically placed where heat generation occurs (at the protection element), providing targeted heat dissipation without requiring the entire circuit board to have high thermal conductivity, thus maintaining miniaturization while addressing thermal concerns at the critical location.
3Ease of manufacture
If a thick circuit board is used, then manufacturing ease is improved, but device complexity increases due to space constraints
Solution Approach 1:
The flexible circuit board with thickness of 0.1mm to 0.5mm simplifies the overall device structure by eliminating the need for additional spacing and mounting structures that would be required for thicker rigid boards. The flexibility allows the circuit board to adapt to the pouch battery contours, reducing assembly complexity while maintaining manufacturability through standard flexible PCB fabrication processes.
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
The design achieves high volumetric efficiency and effective thermal discharge, enabling miniaturized and efficient charging and discharging control of battery cells.
Implementation Method 1
The molding portion may include a thermally conductive material to discharge to outside the protection circuit module heat emitted from the protection element
Data Source
AI summary
Provided is a battery pack. The battery pack includes a battery cell, a pouch covering the battery cell and including a terrace formed in a first direction in which an electrode of the battery cell is drawn out, a flexible circuit board including a controller configured to control charging and discharging of the battery cell, a connector communicating with an external device, and a connection portion flexibly connecting the controller to the connector, a protection element arranged on the controller on a first surface of the flexible circuit board, and a molding portion covering the protection element on the controller, in which at least part of the flexible circuit board on a second surface opposite to the first surface is arranged opposite to a module seating surface of the terrace.