A Modular Equalization Circuit and Its Equalization Method

Abstract

The invention discloses a modular equalization circuit and an equalization method thereof, which are used to solve the problems in the prior art that the equalization topology of series battery packs has relatively high power loss, there are many equalization devices, and the equalization circuit is large in size and high in cost. The invention includes a battery module, a balancing circuit, and a controller. The controller is connected to the balancing circuit, and controls the balancing circuit to balance the battery module; the balancing circuit includes a bottom balancing circuit and a top balancing circuit; the top balancing circuit includes N top-level SPDTs connected in series switch, the top layer LC series circuit is connected in series. The invention realizes the zero-point current switching of the switching device, reduces the switching loss of the switching device, and increases the equalization path through modular equalization, which is easy to expand, and is suitable for the battery management system of the energy storage device in the electric vehicle or the energy storage power station .

Description

technical field [0001] The invention relates to the field of batteries, in particular to a modular equalization circuit and an equalization method thereof. Background technique [0002] With the deteriorating air quality and the gradual scarcity of oil resources, new energy vehicles, especially pure electric vehicles, have become the development hotspots of major automobile companies in the world today. As a key component of electric vehicles, the power battery pack has a major impact on the power, economy and safety of the vehicle. After multiple charging and discharging cycles of the power battery pack, the distribution of the remaining capacity of each battery cell will generally appear to be uneven. If it is not balanced, overcharging and overdischarging will easily occur. In this way, in actual use, the service life of the battery pack will be seriously affected, and there may even be a safety hazard of overheating and fire. [0003] According to the energy consumptio...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the shortcomings of the existing technology, a modular equalization circuit is provided, which is used to solve the problems of high power loss, many equalization devices, large volume and high cost of the equalization circuit in the prior art in the equalization topology of series battery packs; At the moment of turn-off, the equalization circuit with zero current and its equalization method can greatly reduce switching loss, improve equalization efficiency, reduce power loss, and reduce equalization devices.

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