Dynamic voltage balancing system of battery pack

Abstract

The invention relates to a dynamic voltage balancing system of a battery pack, and belongs to an application technology for battery pack energy management in the field of power electronics. The electric quantity is acquired from the total voltage of the battery pack by using electrical isolation of transformers. The electric quantity is transferred to a battery with low electric quantity. Power driving is enabled to realize energy transfer and control through one path by using a series connection technology of the transformers. When the series connected transformers are completely identical, the output voltage of the transformers for single batteries is also maintained the same, and the output voltage is equal to the average voltage of all single batteries. Finally, the voltage of all batteries in the battery pack is enabled to be maintained the same, and a purpose of being balanced is achieved. As long as a fixed pulse width is maintained, the output of each transformer will change along with the total voltage, and the output is maintained on the average voltage value of all single batteries, so that the dynamic voltage balance is formed. According to description of the figure, 1represents a pulse driver, 2 represents a balancing module and 3 represents a battery pack.

Description

technical field [0001] This patent is an application technology in the energy management of battery packs in the field of power electronics. It is composed of multiple sets of transformers, corresponding to the application technology of single battery charging. It is suitable for the inconsistent equalization technology of single voltage in various battery packs. Background technique [0002] In battery applications, we often connect many single batteries in series. And with the battery management system, the single battery will not be damaged due to overcharging and over-discharging. However, due to the inconsistency of the single battery, the full energy of the battery in the application cannot be utilized. Seriously, it will also affect the service life of the battery. Especially rechargeable secondary batteries. When one battery in the battery pack is discharging, it discharges its power faster than the other batteries. At this time, the battery pack will stop disc...

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Problems solved by technology

And transfer power to the battery with low power

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