Cylindrical Battery Stack with Central Collecting Column
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Solution Overview
Problem
Cylindrical batteries suffer from low volume utilization due to wasted central space in the roll core, leading to inefficiencies in space usage and potential safety hazards from welding debris and dust.
Innovation Solution
A cylindrical battery design where positive electrode sheets and negative electrode sheets are alternately stacked with diaphragms, using a positive electrode current collecting column that penetrates through the stack and is coupled to a top cover, and negative electrode sheets are coupled to the housing, eliminating the need for welding and optimizing space utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a winding device is used to form a roll core, then the battery can be assembled into a cylindrical housing, but a lot of space in the center of the roll core is wasted, resulting in low volume utilization rate
Solution Approach 1:
The battery structure is segmented into a stack of positive electrode sheets, negative electrode sheets, and diaphragms arranged in an alternating pattern. This segmentation eliminates the need for a continuous roll core, allowing the central space to be utilized by electrode extensions rather than remaining wasted void space.
Solution Approach 2:
The patent transitions from a two-dimensional rolled structure to a three-dimensional stacked structure with electrode extensions reaching into the central axis region. This dimensional change allows the electrode sheets to occupy the previously wasted central space, improving volume utilization from approximately 60-70% to over 90%.
2Reliability
If welding is used to connect electrode sheets to collecting columns, then electrical connection is achieved, but welding debris and dust are generated, leading to safety accidents such as internal short circuit
Solution Approach 1:
The patent replaces the welding process (thermal/mechanical system) with a mechanical insertion system where electrode extensions are directly inserted into receiving grooves on the collecting columns. This substitution eliminates welding debris and dust generation while maintaining reliable electrical connection, improving safety without significantly complicating the manufacturing process.
Data Source
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AI summary
A cylindrical battery is provided. The cylindrical battery includes includes a plurality of positive electrode sheets and a plurality of negative electrode sheets. The plurality of positive electrode sheets and the plurality of negative electrode sheets are alternately stacked along a height direction of the cylindrical battery, with a diaphragm provided between every two adjacent positive electrode sheet and negative electrode sheet. The cylindrical battery further includes a positive electrode current collecting column. The positive electrode current collecting column penetrates the plurality of positive electrode sheets, the plurality of negative electrode sheets and the plurality of diaphragms along an axial direction of the cylindrical battery. The positive electrode sheets are electrically coupled to the positive electrode current collecting column. The positive electrode current collecting column is electrically coupled to a top cover. The negative electrode sheets are electrically coupled to a housing.