Battery Pack Electrode Tab Layout for Compact High-Capacity Packs
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Solution Overview
Problem
As applications for secondary batteries increase, requiring larger capacities, the size of battery cells and consequently the overall battery pack is also increasing, posing challenges in compact design and efficiency.
Innovation Solution
The battery pack design includes a battery cell with an electrode assembly and an electrode tab, and a protection circuit module with a substrate and substrate tab, where the electrode tab features an electrode sealing unit and bending units that allow for compact configuration by reducing thickness and volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the size of battery cells is increased to increase energy density, then the capacity is improved, but the overall length and size of the battery pack increases
Solution Approach 1:
The electrode tab is configured to extend in multiple directions (lengthwise and widthwise) rather than a single direction, utilizing two-dimensional space to reduce the overall length of the battery pack while maintaining connection functionality
Solution Approach 2:
The protection circuit module is positioned within or adjacent to the electrode tab structure, nesting functional components within the existing spatial framework to minimize additional space requirements
2Quantity of substance
If the size of battery cells is increased to increase energy density, then the capacity is improved, but the overall size of the battery pack increases
Solution Approach 1:
The electrode tab extends in multiple spatial dimensions (lengthwise and widthwise directions), distributing the connection path across two dimensions to reduce the volume occupied by the battery pack while maintaining electrical connectivity
Solution Approach 2:
The electrode tab structure serves multiple functions simultaneously: electrical connection, structural support, and spatial optimization, eliminating the need for separate dedicated components that would increase overall volume
3Length of stationary object
If the electrode tab is configured to extend in multiple directions, then the thickness is reduced, but the structural complexity increases
Solution Approach 1:
The electrode tab is divided into distinct functional segments (first tab extending lengthwise, second tab extending widthwise) that can be independently configured and connected, simplifying the design of each segment while achieving the overall thickness reduction goal
Data Source
AI summary
A battery pack includes a battery cell, and a protection circuit module connected to the battery cell, the battery cell including an electrode assembly and an electrode tab extending from the electrode assembly, wherein the protection circuit module includes a substrate and a substrate tab connected to the substrate, wherein the electrode tab includes an electrode sealing unit extending from a housing of the electrode assembly and an electrode bending unit extending from the electrode sealing unit, wherein the electrode sealing unit is bendable between the substrate and the electrode assembly so that a first sealing surface of the electrode sealing unit corresponds to a housing surface of the electrode assembly, and wherein a surface of the substrate corresponds to a second sealing surface of the electrode sealing unit.