Electrode Tab Connection Structure to Prevent Wrinkling in Cold Pressing
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Solution Overview
Problem
The preparation of electrochemical apparatuses, such as lithium-ion batteries, is hindered by issues like wrinkling and fracturing of electrode plates during cold pressing due to differences in thicknesses of insulating layers and current collector edge blank regions, leading to reduced efficiency and yield.
Innovation Solution
The electrode plate design includes a first part and a second part for electrode tab connection portions, where the second part is arranged on the surface of the first part and welded, eliminating the need for direct formation on the first part, thereby reducing its width and avoiding wrinkling and fracture during cold pressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the edge blank region of the current collector is stretched before cold pressing to prevent wrinkling, then the wrinkling problem is alleviated, but the cold pressing tensile strength increases causing easy fracture
Solution Approach 1:
The patent extracts the electrode tab connection function from the edge blank region by introducing a separate second part structure. The first part serves only as a connection bridge with reduced width, while the second part handles the electrode tab connection, thereby removing the need to stretch the edge blank region and preventing both wrinkling and fracture issues
2Stability of the object's composition
If the edge blank region is stretched before cold pressing to consistent deformation, then deformation consistency is improved, but the preparation efficiency decreases due to increased fracture risk
Solution Approach 1:
The patent extracts the electrode tab connection function from the edge blank region by introducing a separate second part structure. The first part serves only as a connection bridge with reduced width, while the second part handles the electrode tab connection, thereby removing the need to stretch the edge blank region and preventing both wrinkling and fracture issues
Solution Approach 2:
The electrode tab connection portion is segmented into two distinct parts: the first part (connection bridge) and the second part (tab connection structure). This segmentation allows each part to be optimized independently - the first part can be narrow without needing stretching, while the second part handles the connection function, thereby improving preparation efficiency by eliminating the stretching step
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 enhances the preparation yield of electrochemical apparatuses by reducing wrinkling and fracture, improving die-cutting accuracy, and maintaining electrical connectivity while preventing short circuits.
Implementation Method 1
the second parts are arranged on surfaces of the first parts and are electrically connected to the first parts
Data Source
AI summary
An electrochemical apparatus includes an electrode plate. The electrode plate includes a current collector, an active material layer arranged on a surface of the current collector, and a plurality of electrode tab connection portions, where each electrode tab connection portion includes a first part and a second part, and in an unfolded state of the electrode plate, the first parts of the plurality of electrode tab connection portions extend from an edge of the current collector along a width direction of the electrode plate and are spaced apart from each other, and the second parts are arranged on surfaces of the first parts and are electrically connected to the first parts.