Secondary Battery Bent Electrode Tabs Compact Design
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Solution Overview
Problem
The miniaturization of secondary batteries is hindered by the additional space required for lead lines extending from the electrode assembly to the exterior of the battery case, limiting the compactness of the battery design.
Innovation Solution
The design incorporates a stacked electrode assembly with bent non-coating portions and active material regions on the positive and negative electrode plates, alternately arranged with a zigzag-shaped separator, and electrically connected tabs that are exposed externally, eliminating the need for additional space typically occupied by lead lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If lead lines are extended from the electrode assembly to the exterior of the battery case, then electrical connectivity is maintained, but the battery case requires additional space reducing miniaturization
Solution Approach 1:
The electrode plates are bent into a three-dimensional configuration where the non-coating portions extend outward to form external terminals. This dimensional transformation eliminates the need for separate lead lines by integrating the terminal function directly into the electrode structure, thereby reducing the space required in the battery case while maintaining electrical connectivity.
Solution Approach 2:
The invention merges the functions of the electrode plate and the lead line into a single integrated structure. The non-coating portions of the electrode plates serve dual purposes: as active electrode components and as external electrical terminals, eliminating the need for separate lead lines and reducing overall battery case volume.
2Volume of moving object
If electrode plates are bent with non-coating portions at sides, then space for lead lines is eliminated, but manufacturing complexity increases
Solution Approach 1:
The electrode plates are pre-bent during the manufacturing process to form the desired three-dimensional configuration with non-coating portions extending outward. By performing this shaping operation before assembly, the complex geometry is created in advance, simplifying the subsequent assembly process and enabling mass production while maintaining the space-saving design.
Data Source
AI summary
A secondary battery and a method of manufacturing the secondary battery are disclosed. The secondary battery includes an electrode assembly including a positive electrode plate, a negative electrode plate, and a separator, wherein the positive electrode plate and the negative electrode plate are stacked with the separator disposed between, wherein the positive electrode plate includes a plurality of positive electrode non-coating portions including a plurality of first positive electrode bent portions at a first side of the electrode assembly, wherein the negative electrode plate includes a plurality of negative electrode non-coating portions including a plurality of first negative electrode bent portions at a second side of the electrode assembly; a positive electrode tab electrically connected to the positive electrode non-coating portion; and a negative electrode tab electrically connected to the negative electrode non-coating portion.