Synchronous dynamic balancing system for energy of power battery pack

Abstract

The invention discloses a synchronous dynamic balancing system for energy of a power battery pack. The synchronous dynamic balancing system comprises a plurality of balancing modules, a positive balancing bus, a negative balancing bus and a balancing bus synchronous bus, wherein each balancing module comprise a positive terminal of a battery interface, a negative terminal of the battery interface, a positive terminal of a balancing bus, a negative terminal of the balancing bus, a synchronous terminal of the balancing bus, a first high-speed switch, a second high-speed switch, a third high-speed switch, a fourth high-speed switch, an energy storage element, an isolated power supply module and a switch driving module; the positive terminal of the balancing bus is connected with the positivebalancing bus; the negative terminal of the balancing bus is connected with the negative balancing bus; and the synchronous terminal of the balancing bus is connected with the balancing bus synchronous bus. The synchronous dynamic balancing system disclosed by the invention has the advantages of simple line, low cost, high balancing current, high balancing speed, high efficiency, small energy loss, small volume of the whole system, convenience for installation and randomness in battery number and connection mode; the balancing modules are connected with batteries in parallel so that the charge and discharge work of the battery pack cannot be influenced.

Description

technical field [0001] The invention belongs to the field of battery charging and discharging, and in particular relates to a power battery group energy synchronization dynamic equalization system. Background technique [0002] When large-capacity batteries are used in series, because the capacity and internal resistance of a single battery are unbalanced, some batteries will be overcharged and overdischarged, some batteries will be shallowly charged and shallowly discharged, or even damaged during the charging and discharging process. There are two types of energy balance systems for power battery packs in the prior art, one is the energy-depletion type, and the defect of this method is that it can only be used in small-capacity battery packs because of its resistance energy consumption; It is an energy transfer type, and the defect of this method is that its control circuit mostly uses the method of measuring the voltage of a single battery to calculate the balance value, ...

AI Technical Summary

Problems solved by technology

[0002] When large-capacity batteries are used in series, because the capacity and internal resistance of a single battery are unbalanced, some batteries will be overcharged and overdischarged, some batteries will be shallowly charged and shallowly discharged, or even damaged.

There are two types of energy balance systems for power battery packs in the prior art, one is the energy-depletion type, and the defect of this method is that it can only be used in small-capacity battery packs because of its resistance energy consumption; It is an energy transfer type, and the defect of this method is: the control circuit mostly uses the method of measuring the voltage of a single battery to calculate the balance value, so the circuit is complicated, the cost is high, and the volume is large and difficult to install

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