Secondary Battery Electrode Member for Current Convergence
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The current collector in secondary batteries, with a multi-layer structure separated by an insulating substrate, impedes current convergence, affecting current passing capability and safety performance.
Innovation Solution
A current collector design with a first and second conductive layer on an insulating substrate, featuring uncoated regions for connecting conductive members and an adapting sheet to converge currents, reducing thickness and risk of short circuits while enhancing current passing capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layer current collector with insulating substrate is used to improve safety performance, then safety performance is improved, but current passing capability deteriorates due to separated conductive layers
Solution Approach 1:
An adapting sheet is introduced as an intermediary component between the first and second conductive layers. This adapting sheet includes first and second conductive members that respectively connect to uncoated regions of the conductive layers and converge currents to the electrode lead, enabling current convergence while maintaining the safety benefits of the multi-layer insulating structure
Solution Approach 2:
The patent utilizes the width direction dimension by extending the electrode lead beyond the uncoated region in the width direction, creating an additional current extraction path that complements the traditional length-direction current collection, thereby improving overall current passing capability
2Reliability
If conductive layer thickness is reduced to improve safety and reduce short circuit risk, then safety performance is improved, but current passing capability deteriorates
Solution Approach 1:
The adapting sheet merges the current paths from both conductive layers by connecting first and second conductive members to uncoated regions and converging them to the electrode lead. This merging compensates for the reduced current passing capability of individual thin conductive layers while maintaining safety benefits
3Productivity
If uncoated region size is increased to improve current convergence, then current passing capability is improved, but device complexity increases
Solution Approach 1:
Uncoated regions are strategically positioned at specific locations (such as end portions) of the conductive layers where they are needed for current convergence, rather than uniformly distributing uncoated regions throughout. This localized approach improves current passing capability while minimizing additional structural complexity
Data Source
AI summary
A secondary battery and an electrode member thereof, a battery module, and a related apparatus are provided. The electrode member includes a current collector, an active material layer, an adapting sheet, and an electrode lead. The current collector includes an insulating substrate, a first conductive layer, and a second conductive layer. The first conductive layer and the second conductive layer each include a coated region and an uncoated region, the coated region is coated with an active material layer, and the uncoated region is not coated with an active material layer, a size of the current collector in a length direction is larger than that in a width direction, and the uncoated region is located on a side of the coated region in a length direction. The adapting sheet includes a first conductive member and a second conductive member.