Composite Current Collector Electron Conduction via Segmented Conductive Members
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Solution Overview
Problem
Current electrochemical apparatuses with composite current collectors face challenges in electron conduction between conductive layers due to insulation layers, leading to non-conduction issues and increased risk of lithium precipitation and deformation.
Innovation Solution
The electrochemical apparatus includes a housing with a wound electrode assembly featuring conductive members connected to conductive layers, ensuring electrical connection between them, and strategically positioning these members to maintain a sufficient distance to prevent lithium precipitation and deformation, while also using insulators to prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulation layer is provided between two conductive layers in a composite current collector, then electrical insulation between layers is achieved, but electron conduction between the conductive layers is blocked
Solution Approach 1:
The current collector is divided into multiple conductive layers with an insulation layer in between. The segmentation allows each layer to serve specific functions while maintaining overall electrical conductivity through the conductive members that bridge the insulated layers.
Solution Approach 2:
Conductive members are introduced as intermediary elements that connect the first conductive layer and the second conductive layer. These members act as mediators to transfer electrons across the insulation layer, solving the non-conduction problem while preserving the insulation function.
2Object-generated harmful factors
If conductive members are positioned close together to achieve electrical connection, then electron conduction is improved, but lithium precipitation and deformation risk increase
Solution Approach 1:
Different regions of the current collector are designed with different properties. The conductive members are strategically positioned at specific locations rather than uniformly distributed, creating local electrical connection points that balance conduction needs with lithium precipitation prevention.
Solution Approach 2:
The positions of the first conductive member and second conductive member are asymmetrically arranged relative to the insulation layer. This asymmetric positioning ensures sufficient distance between them, preventing lithium precipitation while maintaining effective electron conduction paths.
3Object-generated harmful factors
If the distance between conductive members is reduced to improve electrical connection, then conductivity increases, but deformation and lithium precipitation occur
Solution Approach 1:
The distance parameter between conductive members is optimized to a specific range (L12/L11≥1/5). This parameter change balances electrical conductivity requirements with structural stability, preventing deformation and lithium precipitation while maintaining adequate electron conduction.
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 enables effective electron conduction between conductive layers, reduces lithium precipitation, and enhances the electrochemical performance and service life of the apparatus by maintaining a uniform lithium ion intercalation rate.
Implementation Method 1
the first conductive member is electrically connected to the second conductive member. In an extending direction of the second side, the second side has a length L11, and the first conductive member is apart from the second conductive member by a distance L11, where L12/L11≥1⁄5
Implementation Method 2
the first current collector includes a first conductive layer, a first insulation layer, and a second conductive layer that are stacked, where the first insulation layer is disposed between the first conductive layer and the second conductive layer
Data Source
AI summary
An electrochemical apparatus includes a housing, an electrode assembly, a first conductive member, and a second conductive member. The electrode assembly includes a first electrode plate, a second electrode plate, and a separator. The first electrode plate includes a first current collector, a first active material layer, and a second active material layer. The first current collector includes a first conductive layer, a first insulation layer, and a second conductive layer that are stacked. The first conductive member is connected to the first conductive layer, and the second conductive member is connected to the second conductive layer, where the first conductive member is electrically connected to the second conductive member. Therefore, electronic conduction is achieved between the first conductive layer and the second conductive layer through the first conductive member and the second conductive member.