01 Cell Consistency

1.2 Importance of cell consistency

Include: raw materials, production process, environmental conditions, use process, etc.

1.4 Indicators for measuring cell consistency

2.1 Sorting:

Grouping cells with similar performance parameters into one group is the basis for achieving cell balancing. High precision sorting equipment is a key tool to ensure the consistency of battery cells. Taking our independently developed Lithium battery cell sorting machine as an example, this equipment adopts a high-precision internal resistance tester. Through multi parameter collaborative detection (capacitance resistance, voltage, etc.), it can achieve an internal resistance detection accuracy of ± 0.5% and a voltage detection accuracy of ± 0.05%, greatly improving the performance matching of the same group of batteries.

Prismatic Battery Voltage & IR Sorting Machine

2.2 Thermal management:

Adjust the temperature difference of the entire battery pack to prevent cell imbalance caused by temperature differences. The thermal management system can keep the cell temperature within a small range, slow down the degradation rate of the cell, and maintain the performance balance between cells.

Generally, when designing and testing the thermal management system of the battery pack, it is required that the temperature difference between the cells is <3℃.

2.3 BMS balancing function:

When a cell reaches the charge cutoff voltage first, the BMS starts the charge balancing function, discharges part of the power of the high-voltage cell (passive balancing) or transfers energy to the low-voltage cell (active balancing) by connecting a resistor, removes the charge cutoff condition restriction, and enables the battery pack to charge more power.

ACEY-BBT100-24S series lithium battery equalizer is widely used for the maintenance of lithium battery packs in new energy vehicles. It can solve the problem of inconsistent battery cells after connecting power batteries in series, leading to further expansion of battery cell unevenness, shortened battery life, shortened range, and even battery failure.