Battery Pack Protection Circuit Coating Layout for Tab Contamination Control
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Solution Overview
Problem
Existing battery packs face challenges in managing the application and containment of coating solutions for protection circuit modules, leading to contamination and difficulties in maintaining the desired shape and height, which can affect the integration and functionality of the battery cells.
Innovation Solution
The battery pack design incorporates a protection circuit module with a substrate, component mounting areas, and coating areas of varying heights, including protruding structures and step portions, to contain the coating solution within specific areas, preventing contamination and ensuring proper assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If coating solution is applied to the protection circuit module, then the components are protected and insulated, but the coating solution may spread uncontrollably and contaminate other areas
Solution Approach 1:
The substrate surface is divided into distinct coating areas and non-coating areas using protruding structures. These structures create physical boundaries that segment the coating solution application zone, preventing uncontrolled spreading to substrate tabs and other sensitive areas while ensuring complete coverage of component mounting areas.
Solution Approach 2:
Protruding structures serve as intermediary elements between the coating solution and the substrate tabs. These structures act as barriers that intercept and contain the coating solution within designated areas, preventing direct contact and contamination of substrate tabs while still allowing the coating solution to perform its protective function on components.
2Reliability
If coating solution is applied generously to ensure complete coverage, then all components are protected, but it becomes difficult to maintain the desired shape and height of the protection circuit module
Solution Approach 1:
The protruding structures divide the coating application area into defined zones with specific boundaries. This segmentation allows the coating solution to be applied generously within each zone to ensure complete component coverage while the structure walls prevent excessive buildup that would compromise the module's shape and height specifications.
Solution Approach 2:
Different areas of the substrate receive different treatments: coating areas are designed to receive coating solution for component protection, while non-coating areas maintain original substrate properties. The protruding structures create this local differentiation, allowing precise control over where coating is applied and how much material accumulates in each region.
3Reliability
If the coating area is expanded to cover more components, then better protection is achieved, but the risk of contamination to substrate tabs increases
Solution Approach 1:
The substrate is segmented into coating areas and non-coating areas using protruding structures as boundaries. This segmentation enables the coating area to be expanded to cover all necessary components while physically preventing the coating solution from encroaching on substrate tabs and other non-coating regions.
Solution Approach 2:
The protruding structures function as intermediary barriers between the expanded coating areas and substrate tabs. They allow the coating area to extend as much as needed for component protection while these structures intercept and contain the coating solution, preventing contamination of substrate tabs despite the expanded coverage area.
Data Source
AI summary
A battery pack includes a case, an electrode assembly accommodated in the case, and a protection circuit module connected to the electrode assembly, wherein the protection circuit module includes, a substrate, one or more component mounting areas with a plurality of components, and one or more coating areas, at least some of which have different heights from a top surface of the substrate.