Meaning
Testing the energy storage specifications of a cell occurs at the final stage of the battery production line. In this context, capacity grading yield represents the ratio of A-grade cells to the total number of units processed through the formation and grading cycle. Manufacturers use this figure to evaluate the stability of the coating and assembly lines.
Low values suggest issues with electrode thickness or electrolyte wetting.
Financial Impact
Revenue from a production facility depends on the volume of high quality product that can be sold to premium customers. The capacity grading yield of a line directly determines the profitability of a factory. Cells that fall into lower grades must be sold at a discount or recycled for their materials.
High yields indicate a mature process with minimal variance.
Process Analysis
Improving factory output requires a detailed examination of every step from slurry mixing to vacuum sealing. Variations in the moisture content of the dry room can lead to capacity fluctuations, which reduces the capacity grading yield of the batch. Statistical process control helps identify the root causes of underperforming cells.
Market Positioning
Delivering products that match technical data sheets is a requirement for automotive supply contracts. A stable capacity grading yield allows a company to sign long term agreements. It reflects the ability to deliver consistent quality across millions of units.
