Multiple Conductive Tabs for Battery Current Flow
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Solution Overview
Problem
Wound battery cell structures, such as jelly rolls, exhibit high internal resistances that hinder efficient current distribution and flow during high transient discharge currents, leading to voltage drops and reduced discharge capacity in lithium-polymer batteries.
Innovation Solution
The implementation of multiple conductive tabs coupled to both the cathode and anode substrates within a battery cell, which are electrically connected either inside or outside the pouch, to enhance current flow and reduce internal resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a wound battery cell structure (jelly roll) is used, then the battery cell achieves high packaging efficiency and flexibility, but the internal resistance increases and current distribution becomes inefficient during high transient discharge currents
Solution Approach 1:
The patent divides the single current path in traditional jelly roll structures into multiple parallel current paths by introducing multiple conductive tabs on both cathode and anode. This segmentation allows current to flow through multiple parallel routes, reducing internal resistance and improving current distribution efficiency during high transient discharge currents while maintaining the wound jelly roll structure's packaging efficiency.
2Reliability
If multiple conductive tabs are added to improve current flow, then the transient voltage response improves, but the device complexity increases
Solution Approach 1:
The patent combines multiple conductive tabs from both cathode and anode into integrated current collection paths that flow through the wound jelly roll structure. By merging the functionality of multiple tabs into a coordinated parallel network, the system achieves improved transient voltage response while managing complexity through systematic integration rather than adding isolated components.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration improves the battery cell's transient voltage response to pulse discharges, increasing the discharge capacity utilization and maintaining efficient current flow during high discharge currents.
Implementation Method 1
a first set of conductive tabs is coupled to a cathode substrate of the cathode, and a second set of conductive tabs is coupled to an anode substrate of the anode
Data Source
AI summary
The disclosed embodiments provide a battery cell. The battery cell includes a set of layers which are wound together to form a jelly roll, including a cathode with an active coating, a separator, and an anode with an active coating. The battery cell also includes a pouch enclosing the layers, wherein the pouch is flexible. To increase a current flow in the battery cell, a first set of conductive tabs is coupled to a cathode substrate of the cathode, and a second set of conductive tabs is coupled to an anode substrate of the anode.