How to Control Lithium Battery Consistency

The consistency of lithium cell production is an industry recognized southern map. Although the relatively consistent cells are screened by means of such methods as voltage and internal resistance, using the extremely poor coefficient method, standard differential washing method, and threshold method, the consistency of cells in the battery is difficult to maintain after the cells are grouped., There are many influencing factors, such as temperature field, battery polarization, and self-discharge.

Therefore, the control of battery consistency in batteries is particularly important. At present, the battery management system is widely used in the industry to control the consistency and safety of cells in batteries, thus protecting batteries and extending the service life of products. The use of a battery management system(BMS) can achieve the control of relative consistency of the cell, thus avoiding the overcharging and overloading that may be caused by the inconsistency of the cell during use and extending the useful life of the battery. The battery management system with equilibrium function links the inconsistency of the battery to a certain extent, so that the battery capacity and energy utilization can be maximized.

From the analysis of experimental data, it can be seen that batteries with MBS are charged using charging equipment or chargers, and the occurrence point of the highest voltage is often at the initial stage of constant voltage charging. The initial small voltage inconsistency in the battery in the battery is objective, although the initial voltage inconsistency is small, and a certain equilibrium can be obtained during the constant voltage charging process, and the battery voltage inconsistency is adjusted. However, in long-term use, under the catalysis of the temperature field and other aspects, the inconsistency in the battery in the battery will inevitably gradually increase, which may lead to the overcharging or overdischarge of the battery during the charging and discharging process. Of course, the battery management system will inevitably sacrifice the charge and discharge capacity of the score cell to ensure the consistency between the cells under the premise of ensuring safety.

When a battery with a 50 % unbalanced setting is charged with a charging and discharging device or a charger, the battery in the battery pack reaches its maximum voltage when the charging enters a constant pressure or similar constant pressure phase. At this time, the voltage between the batteries is also adjusted. However, the charging device will overcharge the battery and the voltage will be adjusted. However, the charging device will have less ability to adjust the battery overcharge and the voltage is inconsistent, and the charger can not only prevent the individual battery from overcharging. The equilibrium effect on inconsistency is relatively obvious.

In summary, the maximum voltage of the battery in the battery pack is often at the initial stage of constant voltage charging. The inconsistency between the cells in the battery pack is inherently objective, and more of it comes from the long-term use process. Each charge and discharge cycle does not cause a large voltage difference between the batteries and the state of the cushion, that is, it does not lead to a large inconsistency; The internal battery management system will also adjust the inconsistency during the charging and discharging process, and it can also prevent the cell from being overcharged in extreme imbalances.

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