An energy balance control system between single cells in a battery pack

Abstract

The invention discloses an energy balance control system among single batteries inside a battery pack. The energy balance control system among single batteries inside the battery pack comprises a main controller and an energy bus storage unit. A single chip machine for balancing a control unit and energy is arranged between the main controller and the energy bus storage unit, and connected with the main controller and a single battery voltage test module. Energy transfer between the single batteries and the energy bus storage unit is achieved through a flyback transformer. The single chip machine is capable of achieving energy release and acceptance of the single batteries and point-to-point fast balance of energy of the single batteries through control of drive order of a primary switch drive module and a secondary switch drive module on the flyback transformer. The main controller is capable of achieving energy balance of the single batteries in the whole battery pack through repeat control of the single chip machine on each single battery.

Description

[technical field] [0001] The invention relates to the field of electric vehicle power lithium battery management systems, in particular to an energy balance control system between single batteries in a battery pack. [Background technique] [0002] When charging a battery pack connected in series, due to the differences in the electrochemical characteristics of the basic units in the battery pack, when some unit cells are fully charged, other unit cells still need to continue charging, which makes the fully charged The unit is overcharged. Overcharging will have a very adverse effect on the battery. On the contrary, those batteries that are undercharged for a long time will reduce the capacity of the battery and increase the internal resistance, causing early damage to the battery. Therefore, how to prevent the battery from overcharging and undercharging during the charging process has attracted widespread attention from scholars at home and abroad, and many methods to solv...

AI Technical Summary

Problems solved by technology

Its disadvantage is also complicated and has many components, because each secondary requires a rectifier

The balance circuit should be designed to balance as many monomers as possible, because adding secondary coils is very complicated

[0006] The principle of bidirectional reversible DC / DC dynamic equalization method is as follows: Figure 5 As shown, using a DC / DC converter to establish a bidirectional channel for energy transfer between two adjacent single cells, the energy balance between adjacent single cells also ensures the energy balance of the entire battery pack, but it cannot directly achieve any The balance between two points, the balance effect is not good

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