CN103023107A - Novel lithium battery pack lossless equalization circuit - Google Patents

Novel lithium battery pack lossless equalization circuit Download PDF

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Publication number
CN103023107A
CN103023107A CN2012105286241A CN201210528624A CN103023107A CN 103023107 A CN103023107 A CN 103023107A CN 2012105286241 A CN2012105286241 A CN 2012105286241A CN 201210528624 A CN201210528624 A CN 201210528624A CN 103023107 A CN103023107 A CN 103023107A
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China
Prior art keywords
switching tube
line
power switches
pole
pole double
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Pending
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CN2012105286241A
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Chinese (zh)
Inventor
陈息坤
高艳霞
李丽娟
孙冬
杨胜
张耀
柳钦皇
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University of Shanghai for Science and Technology
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University of Shanghai for Science and Technology
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Application filed by University of Shanghai for Science and Technology filed Critical University of Shanghai for Science and Technology
Priority to CN2012105286241A priority Critical patent/CN103023107A/en
Publication of CN103023107A publication Critical patent/CN103023107A/en
Pending legal-status Critical Current

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Abstract

The invention relates to a novel lithium battery pack lossless equalization circuit. The circuit comprises lithium batteries, single-pole power switches, single-pole double-throw power switches, a metal-oxide-semiconductor field-effect transistor (MOSFET), an inductor, a diode and a supercapacitor, wherein 13 single-pole power switches are connected to anodes and cathodes of 12 lithium batteries respectively, the A line and the B line of the first single-pole power switch are connected to the odd-number single-pole power switches and the even-number single-pole power switches respectively, the C line and the D line of the second single-pole double-throw power switch are connected to the odd-number single-pole power switches and the even-number single-pole power switches respectively, two single-pole double-throw power switches are connected to the first end and the second end of a two-way direct current (DC)-DC main loop respectively, under the charging state of the two-way DC-DC main loop, the inductor L, the first switching tube MOS1, the antiparallel diode D2 of the second switching tube MOS2 and the supercapacitor C form a BOOST charging loop, and the supercapacitor C, the second switching tube MOS2, the antiparallel diode D1 of the first switching tube MOS1 and the inductor L form a BUCK discharging loop under the discharging state of the two-way DC-DC main loop. The circuit has the advantage of being simple in circuit, clear in principle and low in energy consumption.

Description

Novel lithium battery pack non-dissipative equalizing circuit
Technical field
The present invention relates to a kind of novel lithium battery pack non-dissipative equalizing circuit, relate generally to content and comprise battery pack balancing topology and corresponding balanced control strategy.
Background technology
At present, the equalizing circuit topology of lithium ion battery group and balance policy thereof are the study hotspots in the lithium battery research field always.Using now more battery pack balancing strategy is resistance consumption formula topology, the other large resistance in parallel of its every batteries in battery pack is to consume the excess energy of certain joint particular battery, but the energy consumption of the method is high, and loss is large, can have influence on again the heat management usefulness of lithium ion battery simultaneously.A energy consumption is low so the focus of studying at present is to develop, the simple circuit of battery pack balancing topology of circuit.
Summary of the invention
The object of the invention is to the defective for the prior art existence, novel lithium battery pack non-dissipative equalizing circuit is provided, it is a kind of low energy consumption, the balanced topology of high efficiency lithium ion battery group, have simple circuit, principle is clear, energy consumption is low advantage, can realize the arbitrarily equilibrium between the unit lithium battery in the serial lithium battery group, and loss is very low, satisfies preferably the low energy consumption requirement that balanced topology is proposed.
For achieving the above object, the present invention adopts following technical proposals:
A kind of novel lithium battery pack non-dissipative equalizing circuit is pounced on, comprise 12 joint lithium batteries, 13 hilted broadsword power switchs, 2 single-pole double throw power switchs, 2 MOSFET, an inductance, two diodes and a super capacitor, it is characterized in that: described 13 hilted broadsword power switchs link to each other with 12 joint lithium battery both positive and negative polarities respectively, the A of first single-pole double-throw switch (SPDT) links to each other with even numbers with the odd number of 13 power switchs respectively with the B line, even numbers respectively at 13 power switchs links to each other with odd number and the C line of second single-pole double-throw switch (SPDT) is with the D line, and 2 single-pole double-throw switch (SPDT)s are received respectively 1 end and 2 ends of bi-directional DC-DC major loop; Under the described bi-directional DC-DC major loop charged state, inductance L and first switching tube MOS1, the anti-paralleled diode D2 of second switching tube MOS2 and super capacitor C consist of the BOOST charge circuit; Super capacitor C and second switching tube MOS2, first switching tube MOS1 anti-paralleled diode D1 under the discharge condition, and inductance L consists of the BUCK discharge loop; By accurate detection and control strategy, so that balanced major loop operates under the controlled stable state of euqalizing current.
The present invention and prior art are thought comparison, have following apparent outstanding substantive distinguishing features and significantly technological progress:
Patent of the present invention by one group of power power switch array that connects according to certain rule, can be operated in bidirectional DC-DC converter under the Buck-Boost pattern and energy storage ultracapacitor etc. and form.The corresponding cell of turn-on logic gating by the power switch array, the energy of the battery that SOC is higher is transferred to first in the energy storage capacitor, it is lower again the energy in the energy storage capacitor to be transferred to SOC, need in the battery of charging, realize the energy exchange between different batteries in the series battery.By Buck-Boost type bidirectional DC-DC converter discharging and recharging accurately of energy storage super capacitor controlled.
Simultaneously, cover control device complete, that detect each cell SOC state in the series battery, charging and discharging currents size, bidirectional DC-DC converter and energy storage super capacitor operating current size in real time participates in realizing balanced control.
When the battery from higher energy storage shifts energy to ultracapacitor, detect in real time the energy that discharge battery shifts away, and, detect simultaneously the energy that stores in the super capacitor.
When the battery from ultracapacitor to low energy storage shifts energy, detect in real time the energy that super capacitor shifts away, and, detect simultaneously the energy that stores in the low energy-storage battery.
When a certain cell from series battery shifted energy to super capacitor, bidirectional DC-DC converter was operated in the Boost boost mode; When a certain cell shifted energy when from super capacitor to series battery, bidirectional DC-DC converter was operated in the Buck decompression mode.
The technical scheme of patent of the present invention is as shown in Figure 1.
Description of drawings
Fig. 1, balanced major loop topology diagram of the present invention
Fig. 2, power switch array gating truth table
Fig. 3, the Buck-Boost bi-directional DC-DC super capacitor circuit control strategy that flies over
The present invention is further described below in conjunction with drawings and Examples.
Embodiment
A preferred embodiment of the present invention accompanying drawings is as follows:
Referring to Fig. 1, this novel lithium battery pack non-dissipative equalizing circuit comprises 12 joint lithium batteries, 13 hilted broadsword power switchs, 2 single-pole double throw power switchs, 2 MOSFET, an inductance, two diodes and a super capacitor, it is characterized in that: described 13 hilted broadsword power switchs link to each other with 12 joint lithium battery both positive and negative polarities respectively, the A of first single-pole double-throw switch (SPDT) links to each other with even numbers with the odd number of 13 power switchs respectively with the B line, even numbers respectively at 13 power switchs links to each other with odd number and the C line of second single-pole double-throw switch (SPDT) is with the D line, and 2 single-pole double-throw switch (SPDT)s are received respectively 1 end and 2 ends of bi-directional DC-DC major loop; Under the described bi-directional DC-DC major loop charged state, inductance L and first switching tube MOS1, the anti-paralleled diode D2 of second switching tube MOS2 and super capacitor C consist of the BOOST charge circuit; Super capacitor C and second switching tube MOS2, first switching tube MOS1 anti-paralleled diode D1 under the discharge condition, and inductance L consists of the BUCK discharge loop; By accurate detection and control strategy, so that balanced major loop operates under the controlled stable state of euqalizing current.
The concrete balance policy of present embodiment circuit is: after battery set charge/discharge finishes, if the state-of-charge that detects between battery differs greatly, start balanced.The following (see figure 3) of equalization step:
1. by to the carrying capacity under each battery present condition relatively, select the battery that needs discharge and charge according to predefined rule, then calculate respectively the energy value that needs transfer;
2. by S1 ~ higher battery of the charged capacity of S13 power switch array gating, select simultaneously the conduction mode of two-way power switch DS1, DS2, and the MOS2 power switch in the bi-directional DC-DC topology turn-offed, MOS1 is carried out PWM control, consist of the Boost booster circuit, the battery that charged capacity is higher carries out boost charge to super capacitor, simultaneously voltage, the charging current of super capacitor being carried out real-time high-precision measures, with the energy storage state of real-time estimation super capacitor, charging finishes when rechargeable energy reaches calculated value;
3. by S1 ~ lower battery of S13 power switch array gating energy storage, select simultaneously the conduction mode of two-way power switch DS1, DS2, and the MOS1 power switch in the bi-directional DC-DC topology turn-offed, MOS2 is carried out PWM control, consist of the Buck reduction voltage circuit, super capacitor carries out the constant voltage/constant current charging to the lower battery of stored energy capacitance, simultaneously the voltage of super capacitor is measured in real time, with the energy storage state of real-time estimation super capacitor, charging finishes when discharge energy reaches calculated value.
4. in real time the energy storage state of each cell in the series battery is measured, and carry out real-time calculating and the comparison of series-connected cell energy storage state, if the difference of the nuclear power capacity (SOC) of each cell in the series battery is less than threshold, the balanced end, if still unbalanced, get back to the first step, continue automatically to carry out equalization operation.
The flow chart of control strategy as shown in Figure 3, wherein SOC is the state-of-charge (charged capacity) of battery.
In balancing procedure, the gating of power switch array needs special control logic, and the power switch array gate logic in this circuit is seen Fig. 2, and to S1 ~ S13, ' 0 ' is open-minded for shutoff, ' 1 '; To DS1 and DS2, ' 0 ' is dialled (DS1 is connected to the B line, and DS2 is connected to the D line) for left group (DS1 is connected to the A line, and DS2 is connected to the C line), ' 1 ' for the right side.
The invention has the beneficial effects as follows, can reduce to the full extent the energy loss of battery pack, can improve balancing speed when battery pack balancing, improve simultaneously the energy transfer efficiency between battery, circuit structure is simple, and principle is clear.

Claims (1)

1. a novel lithium battery pack non-dissipative equalizing circuit is pounced on, comprise 12 joint lithium batteries (B1 ~ B12), 13 hilted broadsword power switchs (S1 ~ S13), 2 single-pole double throw power switch (DS1, DS2), 2 MOSFET(MOS1, MOS2), an inductance (L), two diode (D1, D2) and a super capacitor (C), it is characterized in that: (B1 ~ B12) both positive and negative polarity links to each other described 13 hilted broadsword power switchs (S1-S13) with 12 joint lithium batteries respectively, the A of first single-pole double-throw switch (SPDT) (DS1) links to each other with even numbers with the odd number of 13 power switchs (S1-S13) respectively with the B line, even numbers respectively at 13 power switchs (S1-S13) links to each other with odd number and the C line of second single-pole double-throw switch (SPDT) (DS2) is with the D line, 2 single-pole double-throw switch (SPDT) (DS1, DS2) receive respectively 1 end and 2 ends of bi-directional DC-DC major loop; Under the described bi-directional DC-DC major loop charged state, inductance (L) and first switching tube (MOS1), the anti-paralleled diode of second switching tube (MOS2) (D1, D2) and super capacitor (C) consist of the BOOST charge circuit; Super capacitor under the discharge condition (C) and second switching tube (MOS2), first switching tube (MOS1) anti-paralleled diode (D1, D2), and inductance (L) consists of the BUCK discharge loop; By accurate detection and control strategy, so that balanced major loop operates under the controlled stable state of euqalizing current.
CN2012105286241A 2012-12-11 2012-12-11 Novel lithium battery pack lossless equalization circuit Pending CN103023107A (en)

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Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104578288A (en) * 2014-12-31 2015-04-29 昆明理工大学 Double-level-bridge-arm series connection storage cell pack efficient equalizer topology circuit and control method thereof
CN105391113A (en) * 2015-09-28 2016-03-09 欣旺达电子股份有限公司 Power battery active lossless bidirectional equalization method, device, and circuit
CN105553010A (en) * 2015-12-26 2016-05-04 惠州市蓝微新源技术有限公司 Equalization circuit employing boost energy transfer and control method for equalization circuit
CN107305971A (en) * 2016-04-21 2017-10-31 凌力尔特有限公司 Switchable inductor uses the energy storage device heap under background to balance
CN107979303A (en) * 2016-10-23 2018-05-01 罗正兰 AC-DC invertible matrix circuits
CN108471149A (en) * 2018-03-21 2018-08-31 上海理工大学 A kind of lithium-ion-power cell group active equalization circuit
CN110021791A (en) * 2019-03-21 2019-07-16 江苏工程职业技术学院 A kind of lithium battery balance protection control method and control system
CN110620413A (en) * 2019-10-14 2019-12-27 河北电立方新能源科技有限公司 Energy equalization circuit of battery system
CN112271791A (en) * 2020-11-09 2021-01-26 西南交通大学 Battery pack balance control circuit and method based on Buck converter

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050029987A1 (en) * 2003-08-08 2005-02-10 Pao-Chuan Lin Battery energy balance circuit and battery charging bypass circuit
CN102222957A (en) * 2011-06-21 2011-10-19 清华大学深圳研究生院 Automatic battery capacity equalization circuit and implementing method thereof
CN102647007A (en) * 2012-04-20 2012-08-22 上海电机学院 Battery pack balanced management system

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050029987A1 (en) * 2003-08-08 2005-02-10 Pao-Chuan Lin Battery energy balance circuit and battery charging bypass circuit
CN102222957A (en) * 2011-06-21 2011-10-19 清华大学深圳研究生院 Automatic battery capacity equalization circuit and implementing method thereof
CN102647007A (en) * 2012-04-20 2012-08-22 上海电机学院 Battery pack balanced management system

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104578288A (en) * 2014-12-31 2015-04-29 昆明理工大学 Double-level-bridge-arm series connection storage cell pack efficient equalizer topology circuit and control method thereof
CN105391113A (en) * 2015-09-28 2016-03-09 欣旺达电子股份有限公司 Power battery active lossless bidirectional equalization method, device, and circuit
CN105553010A (en) * 2015-12-26 2016-05-04 惠州市蓝微新源技术有限公司 Equalization circuit employing boost energy transfer and control method for equalization circuit
CN107305971A (en) * 2016-04-21 2017-10-31 凌力尔特有限公司 Switchable inductor uses the energy storage device heap under background to balance
CN107979303A (en) * 2016-10-23 2018-05-01 罗正兰 AC-DC invertible matrix circuits
CN107979303B (en) * 2016-10-23 2021-04-09 北京华隆浩宏机电工程有限公司 AC-DC reversible matrix circuit
CN108471149A (en) * 2018-03-21 2018-08-31 上海理工大学 A kind of lithium-ion-power cell group active equalization circuit
CN110021791A (en) * 2019-03-21 2019-07-16 江苏工程职业技术学院 A kind of lithium battery balance protection control method and control system
CN110620413A (en) * 2019-10-14 2019-12-27 河北电立方新能源科技有限公司 Energy equalization circuit of battery system
CN112271791A (en) * 2020-11-09 2021-01-26 西南交通大学 Battery pack balance control circuit and method based on Buck converter

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