How to control the consistency of the lithium battery?

Source: 2020 - 04 - 10 21:08 hits: time how to control the consistency of lithium-ion battery lithium battery production consistency is the industry recognized south figure, although through such as voltage, internal resistance, poor use coefficient method, the standard deviation to wash the screening method and threshold method relatively consistent with the battery, the battery group, after the battery pack battery is difficult to maintain consistency, it's a lot of influence factors, such as temperature field, the battery polarization, self-discharge, etc. Therefore, the control of the batteries in the battery consistency is particularly important. At present, the battery management system is widely applied in industry, to control the battery consistency and security of the battery, so as to protect battery and prolong the service life of product. Use the battery management system ( BMS) Can realize to control relative consistency of the battery, so as to avoid in the process of use due to the inconsistency of the battery can lead to overcharge and over discharge, relative to extend the service life of the battery pack. Has the balance function of battery management system to a certain extent, contact the inconsistency problem of battery pack, to maximize the capacity of the battery and energy use. As can be seen from the experimental data analysis, the use of MBS by charging and discharging device or charger to charge the battery pack, the highest voltage is usually in the early stages of a constant voltage charging. The battery cell initial small voltage inconsistency is objective existence. Although the initial voltage inconsistency is lesser, can be in the process of constant voltage charging a certain balance, but the battery voltage is not consistency can be adjusted to a certain extent. But in use for a long time, the battery internal temperature field under the catalysis of inconsistent phenomenon inevitably increase gradually, which can cause the battery produced in the process of charging and discharging charge or discharge, battery management system, of course, is bound to be on the premise of security at the expense of the battery charge and discharge capacity of grades to ensure the consistency between the battery. Unbalanced at 50% battery charging and discharging equipment or use the charger, entered the stage of constant pressure constant pressure, or similar, the highest battery cell battery voltage, at this point, the battery voltage between have some adjustments, but the excessive battery charging and charging equipment can cause voltage also got certain adjustment, but the charging equipment can cause the battery overcharge and less voltage adjustment ability is not consistent, the charger can not only prevent the battery on a single charge, relative to the balance of action is inconsistent. To sum up, the beginning of the batteries in the battery voltage is highest constant voltage charging, the battery in the battery pack is an objective existence, the contradiction between the congenital in the process of use for a long time, every time a charging and discharging cycle does not lead to large voltage difference between the battery and charging status differences, namely big will not lead to inconsistent; In the process of charging and discharging, battery management system will be adjusted to a certain extent this inconsistency, this can also prevent the battery overcharge in extremely unbalanced situation.