Power battery pack equalization circuit based on boost conversion and soft switching, and realization method

A power battery pack and equalizing circuit technology, which is applied to battery circuit devices, circuit devices, collectors, etc., to achieve the effects of improving equalization efficiency, reducing energy waste, and improving inconsistency

A power battery pack and equalizing circuit technology, which is applied to battery circuit devices, circuit devices, collectors, etc., to achieve the effects of improving equalization efficiency, reducing energy waste, and improving inconsistency

CN103532197AActive Publication Date: 2014-01-22湖北德普电气股份有限公司
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  • Power battery pack equalization circuit based on boost conversion and soft switching, and realization method
  • Power battery pack equalization circuit based on boost conversion and soft switching, and realization method
  • Power battery pack equalization circuit based on boost conversion and soft switching, and realization method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0059] Take the 6-cell battery cell 3 as an example, and assume that B 1 is the battery cell 3 with the highest voltage, B 4 It is the battery cell 3 with the lowest voltage.

[0060] The microcontroller 5 of the equalization circuit uses digital signal processing DSP (TMS320F28335), which has high-precision AD sampling and PWM output; the multi-channel strobe switch 9 uses CD4051, which is a single 8-channel digital control analog electronic switch with A, B and C Three binary control inputs and There are 4 inputs in total, with low on-resistance and very low cut-off leakage current; the voltage detection circuit 10 uses Linear Technology's LTC6802 dedicated voltage measurement chip to measure the voltage of each battery in the battery pack in real time.

[0061] Switch module I1 and switch module II11 use a relay with a pair of normally open contacts, the model of which is HJR1-2C L-05V, figure 1 Medium (S x , Q x ) or (S′ x , Q′ x ) is a pair of normally open switch...

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Abstract

The invention discloses a power battery pack equalization circuit based on boost conversion and soft switching, and a realization method of the equalization circuit. The equalization circuit mainly comprises a microcontroller, a switching module, a BOOST conversion module and an LC (inductance-capacitance) resonance circuit, wherein the microcontroller gates battery monomers with maximum voltage and minimum voltage in any position of a battery pack on an equalization bus according to battery monomer numbers corresponding to maximum monomer voltage and minimum monomer voltage; and the microcontroller sends a pair of state-complementary PWM (pulse-width modulation) signals to control the LC resonance circuit, so that the LC resonance circuit alternately operates in charging and discharging states. The equalization circuit and the realization method effectively solve the problem that zero voltage difference of the battery monomers cannot be realized easily due to conduction voltage drop of electric and electronic devices; equalization current is increased; the equalization time is shortened; zero current switching equalization is realized; energy waste is reduced; the inconsistency among the battery monomers is improved effectively; and the equalization efficiency is improved.

Description

technical field [0001] The invention relates to a new energy vehicle power control technology, in particular to a power battery pack equalization circuit based on boost conversion and soft switching and an implementation method. Background technique [0002] At present, lithium-ion batteries are widely used in pure electric vehicles, hybrid electric vehicles, electric motorcycles and UPS uninterruptible power supplies due to their high energy density and low self-discharge rate. Since the voltage of lithium-ion battery cells is only 2.5-3.6V, in order to meet the power drive requirements of electric vehicles, it is generally necessary to use battery cells in series to increase the voltage level. However, during the production process of the battery cell, due to the process and other reasons, there are differences in the capacity and internal resistance of the same batch of batteries; It can also cause an imbalance in battery capacity. Therefore, during the charging and dis...

Claims

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Application Information

Patent Timeline
22 Jan 2014
Publication
CN103532197A
IPC
H02J7/00
Inventors
张承慧; 商云龙