Stacked Cell Electrode Notches for Tight Alignment and Stability
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Solution Overview
Problem
Existing battery designs face issues with poor packing tightness and stacking alignment of electrodes, leading to reduced energy density and increased risk of defects due to electrode movement under external forces.
Innovation Solution
The design incorporates notches on negative electrodes for a flat contact surface, using adhesive tape or clamps to hold the assembly tightly, with insulating packing tape to prevent electrical contact and improve alignment, and folding welding joints to enhance electrode stack stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If traditional packing tapes are applied around the electrode stack, then the assembly process is simple, but the packing tightness and stacking alignment are poor
Solution Approach 1:
The notches are pre-formed on the electrode edges before assembly, creating predetermined alignment features that guide the stacking process and ensure precise positioning of electrodes relative to each other
Solution Approach 2:
The notches act as intermediary alignment features between the packing tape and electrode edges, providing a mechanical interface that enhances the bonding effectiveness and positioning accuracy of the packing tape
2Ease of manufacture
If traditional packing tapes are applied around the electrode stack, then the assembly process is simple, but the volume utilization is reduced due to empty spaces
Solution Approach 1:
The notches are pre-formed on the electrode edges to create a flat contact surface that eliminates irregular gaps and empty spaces, enabling complete volume utilization when the packing tape is applied
Solution Approach 2:
The introduction of notches changes the geometric parameters of the electrode edges, transforming irregular surfaces into flat contact surfaces that maximize the bonding area and eliminate void spaces
3Ease of manufacture
If the electrode stack is held with traditional packing tapes, then the assembly is easy to manufacture, but the electrode stack moves under external forces
Solution Approach 1:
The notches are pre-formed on the electrodes to create predetermined positioning features that prevent movement under external forces, ensuring the electrode stack remains stable during transportation and use
Solution Approach 2:
The notches serve as intermediary mechanical features that enhance the bonding between packing tape and electrodes, creating a more reliable connection that resists external forces and prevents electrode stack movement
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 design increases electrode stack tightness, improves energy density, and enhances reliability against external forces, reducing the risk of defects and ensuring stable performance.
Implementation Method 1
the holding means are in form of adhesive tape, adhesive glues, clamps or combinations thereof
Data Source
AI summary
A cell includes a case designed to form a housing, an assembly of stacked electrodes placed inside the housing and including one or more units each having a positive electrode, a negative electrode, a separator between the positive and negative electrodes and an electrolyte. The assembly is held together, and at least each negative electrode of the one or more units includes one or more notches, vertically aligned along the height of the assembly so to design a substantially flat contact surface.