Lithium battery charging battery balance battery charging method.

In order to reduce the harm of imbalance to lithium battery pack, the balanced power supply circuit should be selected when charging the battery.

Nowadays, there are two ways to carry out balance management for lithium batteries, one is energy consumption, the other is gratitude and feedback. The type of calorie consumption is to show a series loop for a single rechargeable battery, so that a single rechargeable battery with high working voltage can separate electromagnetic energy to achieve balance. Thanksgiving feedback type means that the offset kinetic energy between individual cells is sent to lithium battery pack or some individual cells in lithium battery pack through energy converter.

In theory, when the transformation efficiency is ignored, the opinion feedback does not consume kinetic energy and can complete the stable balance. However, due to the complex control measures and high manufacturing cost of the opinion feedback design scheme, the energy consumption design scheme is selected for the charging head.

Since the internal resistance of AC, the working voltage of electrode and the large usable volume are the actual main parameters of the rechargeable battery, most of the SOC of the rechargeable battery does not change in the whole process of one or continuous battery charging, so the balance of the lithium battery pack is very important, which is completed by adjusting the SOC of each single rechargeable battery. According to scientific research, the balance target with SOC as the balance reference target and fixed relativity is defined, the balance time is flexibly used, the balance utilization rate is improved and the balance volume is reduced.

Taking the SOC of rechargeable battery as the control target, the difference between SOC and rechargeable battery is reduced according to the method of battery charging for separate rechargeable battery. First, the overall goal of balance is defined and set as the mean concentration polarization state value (SOC) of lithium battery pack, so as to improve the balance efficiency and make full use of the advantages of battery charging balance; In addition, the balance control band (DSOC) is set to balance the charge and discharge of the single with high SOC and the battery charge balance of the reverse.

The technical keys of balanced battery charging of general lithium battery pack include stable separation resistance, short-circuit separation resistance, average battery voltage balanced battery charging, power switching capacitor balanced battery charging, blood pressure reducing SPWM balanced battery charging, inductor balanced battery charging, etc. When the integral lithium battery is charged in series, ensure that all batteries are charged evenly, otherwise the characteristics and service life of the whole set of rechargeable batteries will be endangered in the whole process of application.