About 5 kinds of lithium-ion battery assembly method

1.Voltage assembly method

Voltage grouping method can be divided into static voltage grouping method and dynamic voltage grouping method. Static voltage grouping method is also called no-load grouping method, without load, only consider the battery itself, measure the screened single cell in the static state after tens of days of full charge state storage self-discharge rate as well as full-charge state of the battery's open-circuit voltage in different storage period,Battery recycling machine the operation of this method is the simplest, but inaccurate. Dynamic voltage grouping method examines the voltage situation when loaded, but does not take into account factors such as load changes, so it is also inaccurate .

2.Static Capacity Matching Method

Charge and discharge the battery under the set conditions,cylindrical battery pack mahcine calculate the capacity from the discharge current and discharge time, and group the batteries according to the capacity. This method is simple and easy to implement, but it can only reflect the same capacity of the battery in specific conditions, can not explain the complete working characteristics of the battery, there are certain limitations.

3.Internal resistance grouping method

Mainly consider the internal resistance of a single battery,cell stacking machine this method can realize rapid measurement, but because the internal resistance of the battery will change with the discharge process, it is difficult to accurately determine the internal resistance.

4.Multi-parameter grouping method

Considering capacity, internal resistance, voltage, self-discharge rate and other external conditions of the battery comprehensive evaluation, can be sorted out better consistency of the battery pack. However, the premise of this method is that single parameter sorting should be accurate, and time-consuming at the same time.

5. Dynamic characteristics of the grouping method

Dynamic characteristics of the grouping method is to use the battery charging and discharging characteristics of the curve to sort out the battery for grouping. Charge/discharge curve can reflect most of the characteristics of the battery, using dynamic characteristic grouping method can ensure the consistency of various performance indicators of the battery. Dynamic characteristics of the method of grouping more data, usually using computer programs with the realization. In addition, this method of battery assembly utilization is reduced, not conducive to the reduction of battery pack cost. The determination of the standard curve or benchmark curve is also a difficult point in its implementation.

Voltage assembly method battery cell

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