What is battery balancing?

What is battery balancing? Battery balancing refers to the use of differential current for different batteries (or battery packs) in a series of battery packs. The current of each battery in a series battery pack is usually the same, so additional components and circuits must be added to the battery pack to balance the batteries. Only when the batteries in the battery pack are connected in series, and the batteries connected in series are equal to or greater than three levels, the battery balance problem will be considered. When all the batteries in the battery pack meet the following two conditions, the battery reaches balance: 1. When all the batteries have the same capacity and the relative state of charge of the batteries is the same, the battery balance will be achieved. SOC is usually expressed as a percentage of current capacity to rated capacity, so open circuit voltage (OCV) can be used as a measure of SOC. If all the batteries in the unbalanced battery pack can be charged to the maximum capacity by differential charging (balance point), then they can be charged and discharged normally without any additional adjustments, usually one-time adjustments. When using a new battery, users usually have to charge for a long time, and this process actually requires a full charge at one time. This process minimizes the load, maximizes the battery charging time, and reduces the requirements for the battery balancing circuit. 2. When the battery state of charge is the same, if the battery capacity is different, the battery is considered to be in a balanced state. But SOC is only a relative value, and the absolute value of each battery capacity is different. In order to make the state of charge of batteries of different capacities consistent, a differential current must be used each time the battery continues to charge and discharge. The normal charging and discharging time is shorter than the initial charging and discharging time and requires more current. When the battery pack is unbalanced, its usable capacity will decrease, and the battery with the lowest capacity in the series battery pack will determine the total capacity of the battery pack. In an unbalanced battery pack, one or more batteries reach their maximum capacity before the other batteries are charged. And when discharging, the battery that is not fully charged will be discharged before other batteries, so that the battery pack will stop power supply early due to insufficient voltage. Disclaimer: Some pictures and content of the articles published on this site are from the Internet. If there is any infringement, please contact to delete.