Cylindrical Battery Stacked Electrode Layout Without Core Winding
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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 assembly and potential safety hazards from welding debris and dust.
Innovation Solution
A stacked structure with alternately arranged positive and negative electrode sheets, utilizing a positive electrode current collecting column that penetrates through the stack and is connected to a top cover, and negative electrode tabs that contact the housing, eliminating the need for welding and optimizing space use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If a winding structure with roll core is used, then the battery can be assembled, but the central space is wasted resulting in low volume utilization rate
Solution Approach 1:
The battery structure is segmented into distinct functional components: electrode sheets stacked in layers, a separate current collecting column, and a housing. This segmentation allows the removal of the wasteful roll core while maintaining electrical connectivity through the current collecting column that passes through holes in each electrode sheet.
Solution Approach 2:
The unnecessary roll core is extracted and removed from the structure. The patent takes out the wasteful central component that provided no functional value, leaving only the essential elements: electrode sheets, diaphragms, and current collecting column, thereby eliminating the central void space.
2Reliability
If welding is used to connect electrode tabs to collecting columns, then electrical connections are made, but welding debris and dust cause safety hazards and self-discharge
Solution Approach 1:
The welding process is replaced with a mechanical insertion system. The current collecting column is simply inserted through holes in the electrode sheets and secured with insulating structures, eliminating the need for welding operations. This mechanical approach avoids welding debris and dust while maintaining reliable electrical connections.
Solution Approach 2:
An insulating pad or insulating structure acts as an intermediary element that facilitates the mechanical connection between the current collecting column and electrode sheets while preventing direct contact that could cause short circuits. This intermediary enables safe, non-welded assembly.
3Volume of stationary object
If alternating stacking of positive and negative electrode sheets is used, then space utilization is improved, but assembly complexity increases
Solution Approach 1:
The alternating stack is segmented into repeating units of positive electrode sheet-diaphragm-negative electrode sheet-diaphragm, making the assembly process more systematic and easier to manufacture while maximizing space utilization.
Data Source
AI summary
A cylindrical battery is provided. The cylindrical battery 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.