Battery Pack Tab Layout With Substrate Cutout for Compact Length
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Solution Overview
Problem
As applications employing secondary batteries require larger capacities, the increasing size of battery cells leads to larger battery packs, making them less compact and potentially unstable due to external pressures.
Innovation Solution
The battery pack design includes a battery cell with an electrode assembly and an electrode tab that is bent multiple times to reduce overall length, connected to a protection circuit module with a cut portion on the substrate that corresponds to the electrode tab, allowing for stable connection and reduced interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery cell size is increased to increase energy density, then the capacity is improved, but the overall size and length of the battery pack increase
Solution Approach 1:
The electrode tab is bent into a multi-dimensional configuration with first and second bending portions extending in different directions (height direction and width direction respectively), transforming the tab's spatial arrangement from a simple linear extension to a complex three-dimensional structure that fits within the battery pack's width constraint
2Length of stationary object
If the electrode tab is bent to reduce length, then the battery pack length is reduced, but the stability and reliability may be compromised due to potential interference
Solution Approach 1:
A cut portion is created in the substrate at the position corresponding to the bent electrode tab, effectively removing the interfering material from the substrate that would otherwise contact and damage the tab. This extraction of the problematic substrate portion eliminates the source of potential short circuits while maintaining the bent tab's space-saving configuration
Solution Approach 2:
The cut portion is designed with specific dimensional characteristics (width greater than the electrode tab width, gradual widening outward) that create a protective space around the bent electrode tab before any potential contact or stress could occur, cushioning the tab from mechanical stress and electrical interference
3Stability of the object's composition
If the substrate is modified with a cut portion, then the electrode tab can be bent without interference, but the substrate structure becomes more complex
Solution Approach 1:
The cut portion is localized to the specific region where the electrode tab bends, with its width and position precisely matched to the tab's dimensions and trajectory. This localized modification provides the necessary space for the bent tab while leaving the rest of the substrate structure intact and simple
Data Source
AI summary
A battery pack includes a battery cell including an electrode assembly and an electrode tab extending from the electrode assembly, and a protection circuit module on the battery cell, the protection circuit module including a substrate, a substrate tab on the substrate, the substrate tab being connected to the electrode tab, and a cut portion in the substrate in a width direction of the substrate at a position corresponding to the substrate tab, at least a part of the electrode tab being at a same height as the cut portion.