Structure and method of a balance circuit between modularized batteries
A modular battery and balancing circuit technology, applied in the direction of charge balancing circuit, battery circuit device, circuit device, etc., can solve the problems of high modular cost and complex winding of transformers, so as to reduce structural cost, reduce production cost, improve The effect of equalizing speed
Active Publication Date: 2020-07-28
XI AN JIAOTONG UNIV
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Problems solved by technology
However, in practical applications, transformer balancing has not been widely used due to the existence of a large number of components in the circuit, the complexity of transformer winding, and the high cost of modularization.
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[0034] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.
[0035] refer to figure 1 , the present invention provides a modular inter-battery balance circuit structure, which can realize the balance between any batteries, and the circuit structure includes more than two battery cells B ij , transformer T, switching MOSFET and DC bus capacitor C i , all battery cells B ij Connected in series, i=1~n, j=1~m, each battery cell B ij each in series with a switching MOSFET M ij , each adjacent m battery cells form a group of modules, m=2, 3, ..., the internal batteries of the modules are forward-coupled through the transformer T to form the primary multi-winding of the transformer, and the primary winding and the secondary winding of the transformer T are flyback Coupling, Secondary Winding with DC Bus Capacitor C i Parallel connection, transfer energy between the modules through the DC bus, close the switch MOS...
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A modular inter-cell equalization circuit structure and method are provided. The structure comprises more than two battery cells, All battery cells are connected in series, each cell is connected in parallel with a switch, every adjacent m battery cells form a group, Forward coupling of transformer and flyback coupling of primary winding and secondary winding are used, the secondary winding and DCbus capacitance are connected in parallel to form a module, energy is transferred between modules through the DC bus, balance of batteries in the module is realized by forward coupling, and energy istransferred between modules. The invention facilitates the expansion of the whole system, enables the equalization module to be produced in batches, and reduces the production cost. The invention canreduce the quantity of the transformer, the switch tube and the coil winding and reduce the structure cost while ensuring a good balance effect. At the same time, the combination of forward and flyback principle of transformer is adopted to improve the equalization speed. The DC bus is used for energy transfer between modules, and intermediate inverter is not needed, so that energy loss is reduced.
Description
technical field [0001] The invention belongs to the technical field of battery equalization, and in particular proposes a structure and method for a balance circuit between modularized batteries. Background technique [0002] In recent years, due to environmental pollution, depletion of natural resources, relevant government incentive policies, and Middle East issues, oil prices have continued to rise and other reasons. Traditional fuel vehicles are facing a dilemma. New energy electric vehicles have been increasing their market share in recent years due to their advantages such as low environmental pollution and high energy efficiency. As the power source of electric vehicles, the battery system has become a key factor restricting the development of electric vehicles due to its safety and cost. [0003] During use, the power battery is connected in series to form a battery pack to meet the voltage level requirements of the load. The unbalance phenomenon of each single bat...
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IPC IPC(8): H02J7/00
CPCH02J7/0016
Inventor 徐俊彭程李玉梅雪松
Owner XI AN JIAOTONG UNIV