Carbon-Adhered Graphite Tabs for Low-Resistance Battery Terminal Fastening
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Solution Overview
Problem
Existing battery technologies face challenges in achieving low contact resistance and strong mechanical fastening of electrode tabs to terminals, which affect the overall conductivity and durability of the electrochemical cell.
Innovation Solution
The integration of carbon-coated graphite tabs, formed by applying a carbon slurry to graphite electrode tabs and securing them together, creates a highly conductive and strong bond, forming a continuous conductive matrix that reduces contact resistance and enhances the connection between the active material, electrode substrate, and battery terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical fastening alone is used to connect electrode tabs to terminals, then assembly is simple, but contact resistance is high and mechanical strength is insufficient
Solution Approach 1:
The patent applies composite materials by combining carbon slurry coating with mechanical fastening. The carbon slurry creates a conductive composite layer between the electrode tabs and terminals, while the mechanical fastener provides structural support. This composite approach simultaneously reduces contact resistance and enhances mechanical strength without requiring complex multi-component fastening structures.
Solution Approach 2:
The carbon slurry acts as an intermediary material between the electrode tabs and terminals. It fills the interface gap and creates a conductive bridge, mediating the electrical and mechanical connection. The slurry's viscous state during application allows it to penetrate and bond surfaces, then cures to form a strong, conductive intermediate layer that reduces contact resistance.
2Reliability
If carbon slurry coating is applied to reduce contact resistance, then conductivity improves, but manufacturing process complexity increases
Solution Approach 1:
The carbon slurry is applied to the electrode tabs before assembly with the terminals. This preliminary coating ensures that the conductive material is already in place on the contact surfaces, allowing for consistent electrical performance. The pre-application approach simplifies the overall manufacturing process by eliminating the need for post-assembly conductivity treatment.
Solution Approach 2:
The patent utilizes the parameter changes of the carbon slurry as it transitions from a viscous liquid state during application to a solid cured state after bonding. In the liquid state, the slurry flows and penetrates surfaces to ensure complete coverage. After curing, it forms a rigid, conductive bond. This phase transition simplifies application while ensuring strong mechanical and electrical attachment.
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
The carbon-coated graphite tabs reduce contact resistance by about 30% and provide a stronger, more durable connection, improving the conductivity and mechanical integrity of the electrochemical cell.
Implementation Method 1
The carbon slurry may also partially penetrate the graphite tabs. The resulting carbon adhered tabs are stronger and less resistive than bolted graphite tabs without the carbon adhesion.
Implementation Method 2
a plurality of carbon layers interleaved with the at least one stack such that each of the carbon layers is adhered between two of the graphite electrode tabs
Data Source
AI summary
An electrochemical cell includes a plurality of electrode graphite substrates each defining a current collector and a tab continuing from the current collector, the tabs being collected into at least one stack, and a plurality of carbon layers interleaved with the at least one stack such that each of the carbon layers is adhered between two of the graphite electrode tabs.