CN101277022A - Charging equalization circuit and charging device - Google Patents

Charging equalization circuit and charging device Download PDF

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Publication number
CN101277022A
CN101277022A CNA2007100737323A CN200710073732A CN101277022A CN 101277022 A CN101277022 A CN 101277022A CN A2007100737323 A CNA2007100737323 A CN A2007100737323A CN 200710073732 A CN200710073732 A CN 200710073732A CN 101277022 A CN101277022 A CN 101277022A
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China
Prior art keywords
cell
main control
control unit
voltage
charging
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Pending
Application number
CNA2007100737323A
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Chinese (zh)
Inventor
李春青
郭建
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Shenzhen Bak Battery Co Ltd
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Shenzhen Bak Battery Co Ltd
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Publication date
Application filed by Shenzhen Bak Battery Co Ltd filed Critical Shenzhen Bak Battery Co Ltd
Priority to CNA2007100737323A priority Critical patent/CN101277022A/en
Publication of CN101277022A publication Critical patent/CN101277022A/en
Pending legal-status Critical Current

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  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present invention is suitable for the circuit field and provides a charging equalizing circuit and a charging device. The charging equalizing circuit comprises the following components: a battery set which comprises a plurality of series-connected cells; a master controlling unit which collects the voltage of each monomer cell in the battery set through a voltage collecting interface; and an equalization unit which is connected with the equalization control interface of the master control unit and receives the control of the master controlling unit for bypassing the charging current of the monomer battery to next monomer battery when the voltage of the monomer battery gets to the overcharging voltage. Through bypassing the charging current of the monomer battery which gets to the overcharging voltage to the next monomer battery when a plurality of batteries are charged in series, the embodiment of the invention avoids the overcharging of the battery and increases the charging current of other batteries which are not fully charged thereby shortening the charging time and increasing the charging efficiency when the wooden drum effect is eliminated and the capability and service lifetime of the battery set is increased. The embodiment of the invention can be widely applied in the charging circuit with a plurality of power batteries.

Description

A kind of charge balancing circuit and charging device
Technical field
The invention belongs to circuit field, relate in particular to a kind of charge balancing circuit and a kind of charging device.
Background technology
When the multiple batteries series connection is used, because the characteristic of battery is not quite identical, so when if certain battery is pressed threshold values prior to other battery discharge to overdischarge in series battery, discharge circuit will disconnect, equally, other battery will be prior to this battery charge to overcharged voltage in charging process, make charging circuit disconnect, so the battery of underfill will earlier reach overdischarge and presses threshold values and discharge circuit is disconnected in discharge process next time, like this because wooden barrel effect whole battery group will depend on that battery that battery performance is the poorest, so if charging device does not have equalization function will influence the useful life of the performance and the minimizing battery pack of battery pack greatly.
Summary of the invention
The object of the present invention is to provide a kind of charge balancing circuit, be intended to solve that prior art exists because the wooden barrel effect causes the problem that performance reduces and reduce useful life of battery pack.
Another object of the present invention is to provide a kind of charging device.
The present invention is achieved in that a kind of charge balancing circuit, and described charge balancing circuit comprises:
The battery pack that comprises a plurality of series-connected cells;
The main control unit of the voltage of each cell in the battery pack being gathered by the voltage acquisition mouth; And
Be connected with the equilibrium control mouth of described main control unit, when the voltage of cell reaches overcharged voltage, accept the control of main control unit, the charging current of this cell is switched to the balanced unit of next cell.
A kind of charging device comprises the charge balancing circuit, and described charge balancing circuit comprises:
The battery pack that comprises a plurality of series-connected cells;
The main control unit of the voltage of each cell in the battery pack being gathered by the voltage acquisition mouth; And
Be connected with the equilibrium control mouth of described main control unit, when the voltage of cell reaches overcharged voltage, accept the control of main control unit, the charging current of this cell is switched to the balanced unit of next cell.
The embodiment of the invention is by when the multiple batteries serial connection charge, the charging current that will reach the cell of overcharged voltage switches to next cell, when avoiding over-charging of battery, increased the charging current of other underfill batteries, thereby eliminating the wooden barrel effect, when having improved the performance of battery pack and useful life, shortening the charging interval, improved charge efficiency, can be applied to widely in the charging circuit of more piece electrokinetic cell.
Description of drawings
Fig. 1 is the composition structure chart of the charge balancing circuit that provides of the embodiment of the invention;
Fig. 2 is an example structure figure of the charge balancing circuit that provides of the embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
The embodiment of the invention is when the multiple batteries serial connection charge, the charging current that will reach the cell of overcharged voltage switches to next cell, when avoiding over-charging of battery, increased the charging current of other underfill batteries, thereby eliminated the wooden barrel effect.
Fig. 1 shows the composition structure of the charge balancing circuit that the embodiment of the invention provides, this charge balancing circuit can be used in the charging device, specifically comprise: the battery pack 101 that is in series with a plurality of batteries, main control unit (Main Control Unit, MCU) 102, partial pressure unit 103 and balanced unit 104.Main control unit is gathered the voltage of battery, and when cell voltage reached overcharged voltage, main control unit 102 transmitted control signal to balanced unit, the equilibrium that is realized battery pack by balanced unit 104.
Main control unit 102 can be by the chip microcontroller with multichannel mould/number (A/D) translation interface on the market, because single-chip microcomputer can only be accepted the following voltage of 5V, so the voltage on the cell group must be carried out sending into the collection that main control unit 102 is realized voltage after the dividing potential drop by partial pressure unit 103.
Fig. 2 is an example of the present invention, and battery pack 101 comprises 11 series connected battery, and main control unit 102 adopts the PIC16F777 single-chip microcomputer, this single-chip microcomputer has 44 pins, wherein, A/D conversion mouth has 14, and utilizing wherein, 11 road A/D change mouth in order to gather the voltage of 11 cells respectively; Numeral I/O (I/O) mouthful has 17 the tunnel, utilizes wherein 11 road I/O mouths in order to control balanced unit 104 respectively.Be with 27,26 in this example, 25,24,22,21,20,19,15,14,11 pins are used for the voltage acquisition mouth, and 36,38,39,40,41,9,8,2,3,4,5 pins are as equilibrium control mouth.The partial pressure unit 103 of cell BT1 comprises: be connected on the divider resistance R between cell BT1 positive pole and the ground end 1And R 2, to divider resistance R 1On voltage carry out stable coupling capacitance C 1The voltage of supposing cell BT1 is u1, then the voltage u=R of voltage acquisition mouth 1/ (R 1+ R 2) * u1.
The balanced unit 104 of cell BT1 comprises: as field-effect semiconductor transistor (MOSFET) Q of bypass 1, be used to Q 1The biasing resistor R that drives bias voltage is provided 25, the resistance R that is used to regulate euqalizing current 26, be used to Q 1The resistance R of driving voltage is provided 46And P raceway groove bipolar semiconductor triode Q 12, and the diode D that is used for current stabilization 1
Operation principle is as follows: charge normal under the situation, so the balanced control pin of all of single-chip microcomputer output high level is corresponding to the balanced control pin of BT1, i.e. 36 pin output high level, then Q 12Conducting, Q 1Grid become low level, Q 1End, battery BT1 charges normal.Single-chip microcomputer PIC16F777 is by the voltage acquisition mouth, and promptly 27 pin are gathered divider resistance R 1On voltage u, then according to u=R 1/ (R 1+ R 2) * u1 draws the voltage u1 of BT1, when detecting BT1 and reach overcharged voltage, the equilibrium control of single-chip microcomputer PIC16F777 correspondence mouthful, i.e. 36 pin, output low level, at this moment, Q 12End, then Q 1Grid be high level, Q 1Conducting, then charging current is walked around battery BT1, through Q 1, R 26To the charging of next batteries, by that analogy, its bypass MOSFET will conducting when any batteries overcharges, and charging current can be walked around this batteries to next batteries charging, if final section reaches overcharged voltage, then charging current can the inflow place end.Thereby by equalizing circuit provided by the invention when avoiding over-charging of battery, increased the charging current of other underfill batteries, shortened the charging interval, improved charge efficiency, can be applied to widely in the charging circuit of more piece (more than 7 joints) electrokinetic cell.
Above-mentioned when overcharging with cell BT1 the balancing procedure of circuit be illustrated, when other cells overcharged, the circuit conditioning principle was identical, repeats no more.Than typical application, the battery in the above-mentioned battery pack can be lithium battery as the present invention.
The embodiment of the invention is by when the multiple batteries serial connection charge, the charging current that will reach the cell of overcharged voltage switches to next cell, when avoiding over-charging of battery, increased the charging current of other underfill batteries, thereby eliminating the wooden barrel effect, when having improved the performance of battery pack and useful life, shortening the charging interval, improved charge efficiency, can be applied to widely in the charging circuit of more piece electrokinetic cell.
The above only is preferred embodiment of the present invention, not in order to restriction the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.

Claims (12)

1. a charge balancing circuit is characterized in that, described charge balancing circuit comprises:
The battery pack that comprises a plurality of series-connected cells;
The main control unit of the voltage of each cell in the battery pack being gathered by the voltage acquisition mouth; And
Be connected with the equilibrium control mouth of described main control unit, when the voltage of cell reaches overcharged voltage, accept the control of main control unit, the charging current of this cell is switched to the balanced unit of next cell.
2. charge balancing circuit as claimed in claim 1 is characterized in that, when the input voltage of described main control unit is below 5 volts the time, described charge balancing circuit also comprises:
Be connected the voltage acquisition mouth of described main control unit and the partial pressure unit between the cell positive pole.
3. charge balancing circuit as claimed in claim 2 is characterized in that, described partial pressure unit comprises:
Be connected on first resistance and second resistance between cell positive pole and the ground end;
Connect with described first resistance, with described second resistance coupling capacitance in parallel;
The hot end of described second resistance is connected with the voltage acquisition mouth of described main control unit.
4. charge balancing circuit as claimed in claim 1 is characterized in that, described balanced unit comprises:
Base stage is connected the bipolarity triode of grounded emitter with the equilibrium control mouth of described main control unit;
Drain electrode links to each other with the positive pole of cell, the bypass fet that source electrode links to each other with the cell negative pole by a current regulating resistance;
Be connected on the collector electrode of described bipolarity triode and the driving resistor between the bypass fet grid;
Be connected the grid of described bypass fet and the biasing resistor between the source electrode.
5. charge balancing circuit as claimed in claim 4 is characterized in that, described balanced unit also comprises:
A positive pole is connected the current regulator diode that negative pole is connected with the base stage of described bipolarity triode with the equilibrium control mouth of described main control unit.
6. as the described charge balancing circuit of the arbitrary claim of claim 1 to 5, it is characterized in that described battery is a lithium battery.
7. a charging device comprises the charge balancing circuit, it is characterized in that, described charge balancing circuit comprises:
The battery pack that comprises a plurality of series-connected cells;
The main control unit of the voltage of each cell in the battery pack being gathered by the voltage acquisition mouth; And
Be connected with the equilibrium control mouth of described main control unit, when the voltage of cell reaches overcharged voltage, accept the control of main control unit, the charging current of this cell is switched to the balanced unit of next cell.
8. charging device as claimed in claim 7 is characterized in that, when the input voltage of described main control unit is below 5 volts the time, described charge balancing circuit also comprises:
Be connected the voltage acquisition mouth of described main control unit and the partial pressure unit between the cell positive pole.
9. charging device as claimed in claim 8 is characterized in that, described partial pressure unit comprises:
Be connected on first resistance and second resistance between cell positive pole and the ground end;
Connect with described first resistance, with described second resistance coupling capacitance in parallel;
The hot end of described second resistance is connected with the voltage acquisition mouth of described main control unit.
10. charging device as claimed in claim 7 is characterized in that, described balanced unit comprises:
Base stage is connected the bipolarity triode of grounded emitter with the equilibrium control mouth of described main control unit;
Drain electrode links to each other with the positive pole of cell, the bypass fet that source electrode links to each other with the cell negative pole by a current regulating resistance;
Be connected on the collector electrode of described bipolarity triode and the driving resistor between the bypass fet grid;
Be connected the grid of described bypass fet and the biasing resistor between the source electrode.
11. charging device as claimed in claim 7 is characterized in that, described balanced unit also comprises:
A positive pole is connected the current regulator diode that negative pole is connected with the base stage of described bipolarity triode with the equilibrium control mouth of described main control unit.
12., it is characterized in that described battery is a lithium battery as the described charging device of the arbitrary claim of claim 7 to 11.
CNA2007100737323A 2007-03-28 2007-03-28 Charging equalization circuit and charging device Pending CN101277022A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CNA2007100737323A CN101277022A (en) 2007-03-28 2007-03-28 Charging equalization circuit and charging device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CNA2007100737323A CN101277022A (en) 2007-03-28 2007-03-28 Charging equalization circuit and charging device

Publications (1)

Publication Number Publication Date
CN101277022A true CN101277022A (en) 2008-10-01

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CN (1) CN101277022A (en)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102136750A (en) * 2011-04-06 2011-07-27 宋锡和 Monomer charging and discharging tail balancing module and battery pack balancing protection management system thereof
CN102148411A (en) * 2011-03-04 2011-08-10 杭州高特电子设备有限公司 Circulating fast equalization method and circuit for serial battery pack
CN102540078A (en) * 2010-12-17 2012-07-04 沈阳新邮通信设备有限公司 Battery charging test device
CN103972930A (en) * 2013-01-24 2014-08-06 凹凸电子(武汉)有限公司 Battery management system, method for controlling charging of battery pack and battery pack
CN104934647A (en) * 2009-04-16 2015-09-23 威伦斯技术公司 Batteries, battery submodule and battery operational methods
CN102540078B (en) * 2010-12-17 2016-11-30 沈阳新邮通信设备有限公司 Battery charging test device
CN108391455A (en) * 2015-10-30 2018-08-10 三洋电机株式会社 Electricity accumulating unit and accumulating system
CN109649217A (en) * 2019-01-16 2019-04-19 中国船舶重工集团公司第七〇九研究所 A kind of control method of electric car supplement electric-type lithium battery group balancer
US10819124B2 (en) 2016-09-14 2020-10-27 Huawei Technologies Co., Ltd. Fast charging method and related device for series battery pack
US10826305B2 (en) 2016-09-14 2020-11-03 Huawei Technologies Co., Ltd. Fast charging method and related device for parallel battery pack

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104934647A (en) * 2009-04-16 2015-09-23 威伦斯技术公司 Batteries, battery submodule and battery operational methods
US11289918B2 (en) 2009-04-16 2022-03-29 Lithion Battery Inc. Batteries, battery systems, battery submodules, battery operational methods, battery system operational methods, battery charging methods, and battery system charging methods
US10230246B2 (en) 2009-04-16 2019-03-12 Lithium Werks Technology Bv Batteries, battery systems, battery submodules, battery operational methods, battery system operational methods, battery charging methods, and battery system charging methods
CN102540078B (en) * 2010-12-17 2016-11-30 沈阳新邮通信设备有限公司 Battery charging test device
CN102540078A (en) * 2010-12-17 2012-07-04 沈阳新邮通信设备有限公司 Battery charging test device
CN102148411A (en) * 2011-03-04 2011-08-10 杭州高特电子设备有限公司 Circulating fast equalization method and circuit for serial battery pack
CN102136750B (en) * 2011-04-06 2013-11-06 宋锡和 Monomer charging and discharging tail balancing module and battery pack balancing protection management system thereof
CN102136750A (en) * 2011-04-06 2011-07-27 宋锡和 Monomer charging and discharging tail balancing module and battery pack balancing protection management system thereof
CN103972930A (en) * 2013-01-24 2014-08-06 凹凸电子(武汉)有限公司 Battery management system, method for controlling charging of battery pack and battery pack
US9515508B2 (en) 2013-01-24 2016-12-06 O2Micro Inc Battery management system
CN108391455A (en) * 2015-10-30 2018-08-10 三洋电机株式会社 Electricity accumulating unit and accumulating system
US10819124B2 (en) 2016-09-14 2020-10-27 Huawei Technologies Co., Ltd. Fast charging method and related device for series battery pack
US10826305B2 (en) 2016-09-14 2020-11-03 Huawei Technologies Co., Ltd. Fast charging method and related device for parallel battery pack
CN109649217A (en) * 2019-01-16 2019-04-19 中国船舶重工集团公司第七〇九研究所 A kind of control method of electric car supplement electric-type lithium battery group balancer

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Open date: 20081001