In today's vast majority of reserve switching power supplies (DC system software, ups, etc.), the energy conversion storage is all done with battery packs. Then the performance of the battery pack, which is the next guarantee of the uninterruptible power supply system, becomes Very important. The traditional battery charging method has always been that a single battery charger charges the entire group of series-connected battery cells. The battery charger is always connected in series with the battery pack by means of constant current source overcurrent protection. After the wear and tear, the battery charger will be filled automatically, but in the specific application, the battery test equipment has the following problems.
First of all, the characteristics of a single battery are very different. Even the same batch of batteries that leave the factory has a large performance error (very prominent in domestic batteries), so it is regarded as a whole battery during operation. It is impossible to carry out battery charging according to the operation of the main parameters of the single battery operation, which will inevitably lead to some batteries being overcharged or undercharged, and may also cause overcharge and discharge. one of the key factors.
Secondly, it is very difficult to detect the working voltage and internal resistance of a single battery in this kind of operation method. Nowadays, the independent modification of battery testing equipment is widely used, but the battery testing equipment cannot effectively cooperate with the battery charger. From the above 2 points, we can see that in this system, the control of the battery according to the battery condition (working voltage, internal resistance, remaining volume, temperature and other main parameters) and the battery charging curve is just an empty talk.
Therefore, before forming a battery pack, the inspection of a single battery becomes crucial. The more detailed control of the working voltage and volume of a single battery, and the higher the consistency, the battery can only be made after forming a battery pack. Performance is smoother.
