CN103117577B - Energy balance circuit for battery pack of electric vehicle - Google Patents
Energy balance circuit for battery pack of electric vehicle Download PDFInfo
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- CN103117577B CN103117577B CN201310043007.7A CN201310043007A CN103117577B CN 103117577 B CN103117577 B CN 103117577B CN 201310043007 A CN201310043007 A CN 201310043007A CN 103117577 B CN103117577 B CN 103117577B
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Abstract
The present invention relates to a kind of energy balance circuit for battery pack of electric vehicle, comprise balance controller, multiple balanced electronic circuit, connect the bus of each balanced electronic circuit, each battery unit is provided with a balanced electronic circuit, balanced electronic circuit is connected with balance controller respectively, balanced electronic circuit comprises an isolation type bidirectional flyback transformer and electronic switch composition, isolation type bidirectional flyback transformer primary coil two ends are connected with the both positive and negative polarity of bus respectively, isolation type bidirectional flyback transformer secondary coil two ends are connected with cell both positive and negative polarity respectively, an electronic switch is in series with between cell negative pole and secondary coil, also an electronic switch is in series with between bus negative pole and primary coil.Energy balance circuit for battery pack of electric vehicle of the present invention achieves the consistency improving battery pack in the shortest time, thus extends the useful life of battery pack, has the features such as portfolio effect is obvious, applied range.
Description
Technical field
The present invention relates to a kind of circuit of battery pack balancing, particularly relate to a kind of energy balance circuit for battery pack of electric vehicle.
Background technology
Batteries of electric automobile group adopts series system to connect and uses, because the reasons such as production technology cause each cell there are differences, carrying out battery pack, in the process of discharge and recharge, this species diversity will inevitably being expanded, during charging, the battery of the little poor performance of capacity there will be and overcharges phenomenon; During electric discharge, the battery of the little poor performance of capacity had again puts phenomenon; Battery capacity utilance can be more and more lower, and if things go on like this, this vicious circle process will speed up the damage of battery.Especially more easily damage battery when high-power use, only have and to be safeguarded by battery management and just can increase the service life.
In order to reduce the battery inconsistency of series battery, Balance route must be carried out to battery pack in battery charge and discharge process, Balance route can be divided into dissipative equalization and nondissipative equalization 2 kinds: the equal method of dissipative type controls simple, but has energy loss; In nondissipative equalization, the control circuit of discharge and recharge bidirectional equalization method is too complicated and be not easy to realize.In use, accumulator cell charging and discharging is comparatively frequent for electric automobile, and charging and discharging currents is comparatively large, and requires that the charging interval is short.
In sum, all there is respective deficiency in existing various balancing technique, portfolio effect is poor, is difficult to the consistency improving battery pack in the short period of time, is not thus suitable for the electric vehicle battery system that requirement time for balance is short, energy loss is little.
Summary of the invention
In order to overcome the deficiencies in the prior art, the invention provides the energy balance circuit for battery pack of electric vehicle that a kind of successful, time for balance are short.
For achieving the above object, technical scheme of the present invention is:
A kind of energy balance circuit for battery pack of electric vehicle, described battery pack is made up of two or more battery cells in series, described battery unit is composed in series by a joint cell or the above cell of two joints, described equalizing circuit comprises balance controller, multiple balanced electronic circuit, connect the bus of each balanced electronic circuit, each battery unit is provided with a balanced electronic circuit, described balanced electronic circuit is connected with balance controller respectively, described balanced electronic circuit comprises an isolation type bidirectional flyback transformer and electronic switch composition, described isolation type bidirectional flyback transformer primary coil two ends are connected with the both positive and negative polarity of bus respectively, isolation type bidirectional flyback transformer secondary coil two ends are connected with cell both positive and negative polarity respectively, one end Same Name of Ends each other that one end that primary coil is connected with bus negative pole and secondary coil are connected with positive source, an electronic switch is in series with between cell negative pole and secondary coil, also an electronic switch is in series with between bus negative pole and primary coil.Preferably, described isolation type bidirectional flyback transformer secondary coil is connected with each the cell both positive and negative polarity in battery unit respectively by gating switch, and described electronic switch is between gating switch and secondary coil.Preferably, described electronic switch is N-channel MOS pipe switch, reverse parallel connection diode between its drain electrode and source electrode, and grid connects drive circuit, and described drive circuit connects balance controller.
Energy balance circuit for battery pack of electric vehicle advantage of the present invention is as follows:
(1) belong to nondissipative equalization, controlled the drive circuit of metal-oxide-semiconductor switch by balance controller, make transformer primary side winding and vice-side winding energy trasfer, realize electric energy and shift to low electricity side from high electricity side; And realize transformer secondary winding respectively at each cell conducting in battery unit by multi-channel gating switch, realize the energy trasfer of any battery between any two battery units;
(2) mode of common bus is taked to carry out balanced management between transformer, simplify circuit structure, conserve space and cost, simultaneously bus has good electric energy and collects, distributes and transfer capability, makes the transfer of electric energy between each battery unit more efficient, fast;
(3) improve the consistency of battery pack in this circuit realiration the shortest time, thus extend the useful life of battery pack, have portfolio effect obviously, the feature such as applied range.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of energy balance circuit for battery pack of electric vehicle of the present invention;
Fig. 2 is the circuit diagram of the balanced electronic circuit of the embodiment of the present invention first;
Fig. 3 is the circuit diagram of the balanced electronic circuit of the embodiment of the present invention second.
Embodiment
The present invention is further described below in conjunction with drawings and Examples.
As Figure 1-3, energy balance circuit for battery pack of electric vehicle of the present invention, described battery pack is made up of two or more battery unit, described battery unit is composed in series by six joint cells, described equalizing circuit comprises balance controller, four balanced electronic circuits, connect the bus of each balanced electronic circuit, each battery unit is provided with a balanced electronic circuit, described balanced electronic circuit is connected with balance controller respectively, described balanced electronic circuit comprises an isolation type bidirectional flyback transformer, described isolation type bidirectional flyback transformer primary coil two ends are connected with the both positive and negative polarity of bus respectively, isolation type bidirectional flyback transformer secondary coil two ends are connected with cell both positive and negative polarity respectively, one end Same Name of Ends each other that one end that primary coil is connected with bus negative pole and secondary coil are connected with positive source, an electronic switch is in series with between cell negative pole and secondary coil, also an electronic switch is in series with between bus negative pole and primary coil.Isolation type bidirectional flyback transformer secondary coil is connected with each the cell both positive and negative polarity in battery unit respectively by gating switch, and described electronic switch is between gating switch and secondary coil.Electronic switch is N-channel MOS pipe switch, reverse parallel connection diode between its drain electrode and source electrode, and grid connects drive circuit, and described drive circuit connects balance controller.
Energy balance circuit for battery pack of electric vehicle of the present invention is through balance controller and judges each cell balancing state, and according to the equilibrium state obtained, charge balancing or equalization discharge are carried out to cell between each battery unit, the course of work of this circuit is as described below:
Suppose that a certain moment BAT1 cell voltage is too high, and BAT12 cell voltage is too low, balance controller to BAT1 equalization discharge, BAT12 charge balancing, the implementation status of energy balance circuit for battery pack of electric vehicle of the present invention is as follows:
1, the balanced electronic circuit of BAT1 runs as follows: balance controller controls S1A and the S1B conducting in gating switch K1-2, S1C and S1D conducting, balance controller controls metal-oxide-semiconductor drive circuit and exports pulse, control Q1A, Q1B conducting, by transformer T1, the excess energy of BAT1 is transferred on bus, until when balance controller detects BAT1 without the need to equilibrium, turn off S1A and S1B, S1C and the S1D in Q1A, Q1B and gating switch K1-2;
2, balance controller controls metal-oxide-semiconductor drive circuit and exports pulse, control Q2A, Q2B conducting, balance controller controls S12A and the S12B conducting in gating switch K11-12, S12C and S12D conducting, bus is charged to BAT12 battery by transformer T2, until when balance controller detects BAT12 without the need to equilibrium, turn off S12A and S12B, S12C and the S12D in Q2A, Q2B and gating switch K11-12.
Bus has the effect collecting, distribute and transmit electric energy, and adopt bus to connect between the former limit winding of each transformer, vice-side winding connects each cell by gating switch, so just achieves the energy trasfer between bus and each unit cell battery.Under the control of balance controller, unnecessary electricity can be transported to bus by any joint cell, and bus also can charge by the cell lower to other unit electricity.In other words, bus is equivalent to an electricity terminal, and each joint cell all can carry out electricity transfer with bus, thus realizes any batteries and transferred to by electricity in other unit cell battery.
In sum, this energy balance circuit for battery pack of electric vehicle structure is simple, euqalizing current is large, time for balance is short, can complete the balancing energy between battery fast, ensures the consistency of cell in battery pack, postpones the useful life of battery pack.
Claims (1)
1. an energy balance circuit for battery pack of electric vehicle, described battery pack is made up of two or more battery cells in series, described battery unit is composed in series by a joint cell or the above cell of two joints, it is characterized in that: described equalizing circuit comprises balance controller, multiple balanced electronic circuit, connect the bus of each balanced electronic circuit, each battery unit is provided with a balanced electronic circuit, described balanced electronic circuit is connected with balance controller respectively, described balanced electronic circuit comprises isolation type bidirectional flyback transformer and electronic switch, described isolation type bidirectional flyback transformer primary coil two ends are connected with the both positive and negative polarity of bus respectively, isolation type bidirectional flyback transformer secondary coil two ends are connected with cell both positive and negative polarity respectively, one end Same Name of Ends each other that one end that primary coil is connected with bus negative pole and secondary coil are connected with cell positive pole, the first electronic switch is in series with between cell negative pole and secondary coil, the second electronic switch is in series with between bus negative pole and primary coil,
Described isolation type bidirectional flyback transformer secondary coil is connected with each the cell both positive and negative polarity in battery unit respectively by gating switch, and described first electronic switch is between gating switch and secondary coil, and each gating switch connects balance controller;
Described first electronic switch and the second electronic switch are N-channel MOS pipe switch, reverse parallel connection first diode between the drain electrode of the first electronic switch and source electrode, the positive pole of the first diode connects cell negative pole by gating switch, and the negative pole of the first diode connects secondary coil; Reverse parallel connection second diode between the drain electrode of the second electronic switch and source electrode, the positive pole connection bus negative pole of the second diode, the negative pole of the second diode connects primary coil; One end different name end each other that one end that primary coil is connected with the second diode cathode and secondary coil are connected with the first diode cathode; The grid of the first electronic switch connects isolated drive circuit, and described isolated drive circuit connects balance controller through PWM module, and the grid of the second electronic switch connects PWM module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310043007.7A CN103117577B (en) | 2013-02-04 | 2013-02-04 | Energy balance circuit for battery pack of electric vehicle |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310043007.7A CN103117577B (en) | 2013-02-04 | 2013-02-04 | Energy balance circuit for battery pack of electric vehicle |
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| CN103117577A CN103117577A (en) | 2013-05-22 |
| CN103117577B true CN103117577B (en) | 2015-10-28 |
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| CN105244552A (en) * | 2013-12-03 | 2016-01-13 | 义乌市运拓光电科技有限公司 | Lithium battery |
| CN103986202B (en) * | 2014-03-31 | 2016-05-11 | 江苏省电力公司盐城供电公司 | A kind of electric motor car of electric weight intelligent equalization |
| CN104659877B (en) * | 2015-01-28 | 2017-12-22 | 杭州高特电子设备股份有限公司 | A kind of isolation bidirectional constant maintenance system based on shared device power supply |
| WO2017113340A1 (en) * | 2015-12-31 | 2017-07-06 | SZ DJI Technology Co., Ltd. | Method and system for balancing battery assembly |
| CN106849266B (en) * | 2017-03-28 | 2018-03-27 | 合肥工业大学 | A kind of equalizing circuit for charging and discharging lithium battery energy management |
| CN106981993A (en) * | 2017-05-19 | 2017-07-25 | 深圳市奥耐电气技术有限公司 | A kind of efficiently two-way DC DC converters |
| CN107147324A (en) * | 2017-05-19 | 2017-09-08 | 深圳市奥耐电气技术有限公司 | One kind efficiently isolates two-way AC DC converters |
| CN110011365A (en) * | 2018-01-05 | 2019-07-12 | 杭州科工电子科技有限公司 | The equal balance system of energy-storage battery group |
| CN108322057A (en) * | 2018-04-17 | 2018-07-24 | 江苏联能电子技术有限公司 | A kind of two-way circuit topological structure for piezoelectric pile driving |
| CN109004696A (en) * | 2018-04-18 | 2018-12-14 | 国家电网公司 | A kind of substation battery multifunction control system and its control method |
| CN108923508A (en) * | 2018-10-10 | 2018-11-30 | 北京动力京工科技有限公司 | A kind of active equalization of battery device containing flyback converter |
| CN109950949B (en) * | 2019-03-14 | 2023-02-28 | 上海电气集团股份有限公司 | Three-level active equalization circuit of lithium battery pack for energy storage |
| CN111391708A (en) * | 2020-03-26 | 2020-07-10 | 江西优特汽车技术有限公司 | Method for reducing voltage difference of equalization circuit and improving equalization efficiency |
| CN111969673A (en) * | 2020-07-20 | 2020-11-20 | 武汉理工大学 | Active equalization system and method for lithium ion power battery pack |
| CN113224816B (en) * | 2021-05-17 | 2022-12-20 | 上海交通大学 | Isolation interface, gating network, protection and equalization circuit and method for series battery pack |
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| DE102008027062B4 (en) * | 2008-06-05 | 2022-01-27 | Bayerische Motoren Werke Aktiengesellschaft | motor vehicle |
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| CN102832653A (en) * | 2011-12-29 | 2012-12-19 | 中航锂电（洛阳）有限公司 | Active equalization circuit for multi-monomer series battery |
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| CN103117577A (en) | 2013-05-22 |
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Address after: Xihu District Yi Lok Road Hangzhou city Zhejiang province 310012 No. 223 Yinjiang Technology Industrial Park B building 6 floor Patentee after: Hangzhou high special electronic equipment Limited by Share Ltd Address before: Xihu District Yi Lok Road Hangzhou city Zhejiang province 310012 No. 223 Yinjiang Technology Industrial Park B building 6 floor Patentee before: Gaote Electronic Apparatus Co., Ltd., Hangzhou |