Battery Pack Sealing Terrace for Circuit Module Placement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing battery packs face challenges in compactness due to spatial interference between the protection circuit module and the sealing portion of the battery cell, which can lead to increased size and potential electrical short circuits.
Innovation Solution
The battery pack design incorporates a sealing portion with a terrace and side sealing portion that allows the protection circuit module to be arranged on one surface, with the side sealing portion folded to protrude in a direction opposite to the protection circuit module, avoiding interference and allowing for a more compact configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protection circuit module is placed adjacent to the battery cell, then electrical connection is achieved, but spatial interference with the sealing portion occurs leading to increased size
Solution Approach 1:
The protection circuit module is arranged on the terrace portion which extends in a direction substantially perpendicular to the facing direction of the first and second cases, utilizing the third dimension (depth/thickness direction) rather than only the planar space between cases. This dimensional transition allows the circuit module to be positioned without increasing the overall width or height of the battery pack, thereby resolving the spatial interference issue while maintaining electrical connection functionality
2Reliability
If the sealing portion is extended to ensure sealing, then sealing reliability is improved, but spatial interference with the protection circuit module increases
Solution Approach 1:
The sealing portion is segmented into two distinct functional regions: a main sealing region that ensures sealing reliability, and a terrace portion that provides a dedicated space for the protection circuit module. This segmentation allows the sealing function and circuit mounting function to be spatially separated, eliminating interference between these two components while maintaining both sealing reliability and circuit functionality
3Reliability
If the protection circuit module is made larger to accommodate circuits, then charge/discharge control is improved, but spatial interference with the sealing portion increases
Solution Approach 1:
The protection circuit module utilizes the terrace portion which extends in the thickness direction of the battery pack, allowing the circuit module to have sufficient area for reliable charge/discharge control without increasing the planar footprint. By transitioning from two-dimensional planar expansion to three-dimensional thickness utilization, the circuit module can be adequately sized for functionality while avoiding spatial interference with the sealing portion
Data Source
AI summary
A battery pack includes a battery cell and a protection circuit module. The battery cell includes i) an electrode assembly to which an electrode tab is connected and ii) first and second cases coupled to face each other to form an accommodating portion accommodating the electrode assembly and a sealing portion sealing the accommodating portion. The sealing portion includes i) a terrace portion extending across the electrode tab and comprising a first surface on a first case side and a second surface on a second case side and ii) a side sealing portion including an end contacting the terrace portion and an extension extending from the end. The protection circuit module is arranged on the first or second surface of the terrace portion. The end of the side sealing portion is folded in such a way not to spatially interfere with the protection circuit module.