Protective Circuit Module Lead Plate Diagonal Configuration
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Solution Overview
Problem
Conventional lithium ion secondary batteries with protective circuit modules face issues of reduced surface area for device installation and increased susceptibility to short circuits due to truncated substrates, which necessitate the use of dummy plates for structural stability.
Innovation Solution
The implementation of lead plates on either side of the protective circuit module, with foot plates and stepped plates arranged diagonally and notched to expose connections, eliminates the need for dummy plates, enhancing surface area availability for component installation and reducing the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the substrate is truncated to secure welding space for positive electrode tab, then the welding space is secured, but the surface area for device installation is reduced
Solution Approach 1:
The lead plate extends in multiple dimensions with a body portion, first extension, and second extension forming a three-dimensional structure. This multi-dimensional configuration provides both welding surfaces and device mounting areas without requiring substrate truncation, thereby resolving the contradiction between securing welding space and maintaining surface area for device installation.
2Ease of manufacture
If the substrate is truncated to accommodate lead plate connections, then the lead plate connections are enabled, but the spacing between devices becomes insufficient increasing short circuit risk
Solution Approach 1:
The lead plate is segmented into distinct functional portions: a body portion for connection to the protective circuit module, a first extension for welding to the positive electrode tab, and a second extension for welding to the negative electrode tab. This segmentation allows each portion to be optimally positioned and spaced, enabling proper lead plate connections while maintaining sufficient spacing between devices to reduce short circuit risk.
3Stability of the object's composition
If dummy plates are added to balance the structure, then structural stability is improved, but the device complexity and production steps increase
Solution Approach 1:
The lead plate serves multiple functions simultaneously: it provides structural support and stability, enables electrical connections between the protective circuit module and electrode tabs, and offers mounting surfaces for devices. By integrating these multiple functions into a single component, the need for separate dummy plates is eliminated, thereby maintaining structural stability while reducing device complexity and production steps.
Data Source
AI summary
A secondary battery includes a plurality of bare cells including a first bare cell and a second bare cell and a protective circuit module spaced above the plurality of bare cells. A first lead plate electrically connects the protective circuit module and the first bare cell, the first lead plate having a first foot plate electrically connected to the first bare cell. A second lead plate electrically connects the protective circuit module and the second bare cell, the second lead plate having a second foot plate attached to the second bare cell and arranged generally diagonally from the first foot plate with respect to the protective circuit module.