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How to control the consistency of lithium batteries

by:dcfpower     2021-03-20
u003cpu003eu003c/pu003e The consistency of lithium battery pack production is recognized by the industry. Although the battery is relatively consistent through the use of voltage, internal resistance, range coefficient method, standard deviation washing method, and threshold method, the battery After grouping, it is difficult to maintain the battery consistency in the battery pack, which has many influencing factors, such as temperature field, battery polarization, and self-discharge. Therefore, the control of battery consistency in the battery pack is particularly important. At present, the industry generally uses battery management systems to control the consistency and safety of the batteries in the battery pack, thereby protecting the battery pack and extending the service life of the product. The battery management system (BMS) can be used to control the relative consistency of the battery, so as to avoid possible overcharge and overdischarge during use due to the inconsistent battery, and relatively extend the service life of the battery pack. The battery management system with equalization function addresses the inconsistency of the battery pack to a certain extent, and maximizes the capacity and energy utilization of the battery pack. u003cpu003e From the analysis of the experimental data, it can be seen that the battery pack with MBS is charged with a charging and discharging device or a charger, and the highest voltage is often in the initial stage of constant voltage charging. The initial minor voltage inconsistency of the batteries in the battery pack is an objective existence, although the initial voltage inconsistency is small, and a certain balance can be obtained during the constant voltage charging process, and the battery voltage inconsistency can be adjusted to a certain extent. However, in the long-term use, the inconsistency of the batteries in the battery pack will gradually increase under the catalysis of the temperature field and other aspects, which may cause the battery to overcharge or overdischarge during the charging and discharging process. Of course, the battery pack management system also It will inevitably sacrifice the charge and discharge capacity of the score battery under the premise of ensuring safety to ensure consistency between batteries. u003c/pu003eu003cpu003eu003c/pu003eu003cpu003e When the battery pack with 50% unbalanced setting is charged with a charging and discharging device or a charger, when the charging enters a constant voltage or similar constant voltage stage, the batteries in the battery pack are all At this time, the voltage between the batteries is adjusted to a certain extent, but the charging equipment will overcharge the battery and the voltage will also be adjusted to a certain extent, but the charging equipment will cause the battery to overcharge and cause voltage inconsistency The adjustment ability is small, and the charger can not only prevent the overcharging of a single battery, but also has a relatively obvious effect on inconsistent balance. u003c/pu003eu003cpu003eu003c/pu003eu003cpu003e In summary, the highest voltage of the batteries in the battery pack is often in the initial stage of constant voltage charging. The inconsistency between the batteries in the battery pack is inherent and objective. More The reason is that in the long-term use process, each charge and discharge cycle will not cause a large voltage difference and a difference in the state of the charge pad between the batteries, that is, it will not cause large inconsistencies; the management system in the battery pack will also Certain adjustments to the inconsistency can also prevent overcharging the battery under extreme imbalance conditions. u003c/pu003eu003c/pu003e
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