Modular battery equalization circuit based on push-pull converter and control method of modular battery equalization circuit

A technology for modularizing batteries and balancing circuits, applied in charge balancing circuits, battery circuit devices, circuit devices, etc., can solve the problems of long balancing paths, complicated control, and poor scalability, and achieve simple control, eliminate cross effects, and ensure balance. Effect

Inactive Publication Date: 2017-11-24
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above technical problems, the present invention provides a modular battery equalization circuit based on a push-pull converter and its control method, which overcomes the shortcomings of the existing equalization technology such as complex control, long equalization path, and poor scalability.

Method used

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  • Modular battery equalization circuit based on push-pull converter and control method of modular battery equalization circuit
  • Modular battery equalization circuit based on push-pull converter and control method of modular battery equalization circuit
  • Modular battery equalization circuit based on push-pull converter and control method of modular battery equalization circuit

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Embodiment 1

[0038] Taking dual output as an example, the structure is as follows figure 2 As shown, when the input voltage is higher than the bus voltage, the circuit has four modes, as shown in Fig. 3(a), Fig. 3(b), Fig. 3(c), and Fig. 3(d) respectively. The working mode circuit diagram when the voltage is higher than the bus voltage, at this time the excitation inductance is large, V B1 >V B2 .

[0039] The circuit has four modes when the input voltage is higher than the bus voltage.

[0040] Mode1: The mode-to-mode correspondence in Figure 3(a) Figure 4 middle t 1 time period, at this time the upper switch tube S 1 conduction, the lower switching tube S 2 closure. The voltage on the AC bus AB is the average of the two input battery voltages - (V 1 +V 2 ) / 2, the current flows from the AC bus through the inductance into the terminal with the same name on the secondary side of the transformer, the current i L Positive increase. During this period, battery B 1 Discharge throu...

Embodiment 2

[0046] Taking dual output as an example, the structure is as follows figure 2 As shown, when the input voltage is lower than the bus voltage, the circuit has four modes, as shown in Fig. 5(a), Fig. 5(b), Fig. 5(c), and Fig. 5(d). The working mode circuit diagram when the voltage is lower than the bus voltage, at this time the excitation inductance is large, V B1 >V B2 .

[0047] Mode1: The mode-to-mode correspondence in Figure 5(a) Image 6 middle t 1 time period, at this time the upper switch tube S 3 conduction, the lower switching tube S 2j off, the voltage on the AC bus is the average of the two input voltages - (V 1 +V 2 ) / 2, leakage inductance current i L Positive increase, flow through the switching tube S 2j-1 The current is equal to the current flowing through the inductor L. battery B 2 Power is drawn from other batteries via an AC parallel bus. When the switch tube S 3 When closed, the modal one ends.

[0048] Mode2: Mode 2 in Figure 5(b) corresponds ...

Embodiment 3

[0055] Figure 8 It is the circuit topology diagram of the present invention taking three-way output as an embodiment, Figure 9 for Figure 8 The simulation waveform of the embodiment, its simulation parameters are: the first road input branch battery voltage V 1 =3.7V, the second input branch voltage V 2 =3.2V The third input branch voltage V 3 = 3.4V, L 1 =L 2 =L 3 =5uΩ. from Figure 9 It can be seen that this circuit can realize the function of automatic equalization.

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Abstract

The invention relates to the technical field of lithium battery voltage sharing, in particular to a modular battery equalization circuit based on a push-pull converter and a control method of the modular battery equalization circuit. The circuit is formed by connecting a plurality of push-pull equalization modules and an alternating-current bus in parallel, and in the whole equalization circuit, the equalization module corresponding to one battery and the equalization modules corresponding to other batteries jointly form the bidirectional converter, so that automatic equalization of a whole battery pack is achieved. Compared with a traditional isolation type battery equalization circuit, energy in the equalization circuit can be directly transmitted between the batteries of the whole battery pack, the expandability of the equalization circuit is improved, the control difficulty is reduced, and meanwhile, the cross influence in a magnetic coupling equalization circuit is eliminated by means of electric coupling.

Description

technical field [0001] The invention relates to the technical field of voltage equalization of lithium batteries, in particular to a modular battery equalization circuit based on a push-pull converter and a control method thereof. Background technique [0002] With the rapid consumption of non-renewable resources such as oil, coal, and natural gas, as one of the green light sources with the most development and application prospects, power batteries have won great achievements in the field of energy storage due to their advantages such as high energy density, no memory effect, and long cycle life. widely used. Due to the limitation of battery cell voltage, in many high-voltage applications, it is necessary to use multiple battery cells in series at the same time to achieve high-voltage output. However, due to the individual differences of batteries, it may cause overcharge or overdischarge of a single cell during synchronous charging, which shortens the life of the battery ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J7/00
CPCH02J7/0014
Inventor 徐顺刚刘倩怡许建平李小龙文瑞强
Owner SOUTHWEST JIAOTONG UNIV
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