CN102832653B - The how monomer series-connected active equalizer circuit of cell pack of one - Google Patents
The how monomer series-connected active equalizer circuit of cell pack of one Download PDFInfo
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- CN102832653B CN102832653B CN201110451855.2A CN201110451855A CN102832653B CN 102832653 B CN102832653 B CN 102832653B CN 201110451855 A CN201110451855 A CN 201110451855A CN 102832653 B CN102832653 B CN 102832653B
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Abstract
The present invention relates to the how monomer series-connected active equalizer circuit of cell pack of one, comprise DC/DC converter and the switch arrays of a band isolating transformer, the positive switch that switch arrays are used for connecting respectively each cell positive pole by one group of one end is formed for the negative switch being connected each cell negative pole respectively with one group of one end, the other end of each positive switch is shorted together, form a positive pole common port, the other end of each negative switch is shorted together, and forms a negative pole common port; Two inputs of DC/DC converter are connected respectively described positive pole common port and negative pole common port by a pair input switch, and two outputs of DC/DC converter are connected respectively described positive pole common port and negative pole common port by a pair output switch.The program can realize the direct bidirectional energy transfer between any two cells, solves capacity and the electricity problem of inconsistency of each cell.
Description
Technical field
The present invention relates to a kind of active equalizer circuit of cell pack, particularly relate to one how monomer series-connected dynamic lithium battery group active equalization circuit.
Background technology
The application of lithium ion battery, especially lithium-ion-power cell is more and more extensive, becomes an important directions of new energy technology development.The capacity of cell is larger, and the capacity volume variance of cell is also larger.There are two class inconsistencies in use procedure in high-capacity lithium electronic cell, first kind inconsistency is caused by actual capacity difference, and Equations of The Second Kind inconsistency is caused by initial quantity of electricity difference in groups.Due to inconsistency, in charging process, certain monomer can be full of at first, have again certain monomer can emptying at first in discharge process, these drawbacks limit charging and discharging capabilities of whole battery pack.Along with the increase of cycle-index, battery inconsistency can be aggravated gradually, has had a strong impact on battery performance.This difficult problem proposes new challenge to battery management system, namely realizes balanced when battery set charge/discharge.
Existing battery management system much has equalization function, but the ability of equalization is limited, cannot solve two class inconsistencies of battery completely.Recently, the active equalization method being representative with DC/DC converter obtains to be studied widely, and active equalization method also becomes the developing direction of battery management system equilibrium.The method can realize bidirectional equalization, and euqalizing current is large, efficiency is high, effectively can alleviate and solve the inconsistency that battery shows in use procedure in groups.But existing active equalization system, its circuit forms more complicated, switch element uses too much.If application number is the Chinese utility model patent of 201020266091.0, this device adopts MOS switching tube to realize equalization channel switching, and simple metal-oxide-semiconductor easily causes battery pack short circuit, realizes difficulty; And too much, MOS switching tube path is too many, system complex for battery pack and aerial lug in the program.
Summary of the invention
The object of this invention is to provide the simple how monomer series-connected active equalizer circuit of cell pack of a kind of circuit, in order to solve the baroque problem of existing active equalization circuit.
For achieving the above object, the solution of the present invention is: the how monomer series-connected active equalizer circuit of cell pack of one, comprise DC/DC converter and the switch arrays of a band isolating transformer, the positive switch that switch arrays are used for connecting respectively each cell positive pole by one group of one end is formed for the negative switch being connected each cell negative pole respectively with one group of one end, the other end of each positive switch is shorted together, form positive pole common port (a), the other end of each negative switch is shorted together, and forms negative pole common port (b); Described DC/DC converter has two inputs (Vin-, Vin+) and two outputs (Vo-, Vo+), two inputs of DC/DC converter are connected respectively described positive pole common port (a) and negative pole common port (b) by a pair input switch (M2, M3), and two outputs of DC/DC converter are connected respectively described positive pole common port (a) and negative pole common port (b) by a pair output switch (M1, M4).
Described how monomer series-connected active equalizer circuit of cell pack also comprises one group of electric capacity, and electric capacity is wherein corresponding with each cell in parallel respectively.
Described DC/DC converter is a flyback transformer.
Described positive switch, negative switch, input switch, output switch are relay or switching tube.Described switching tube is that MOS is to pipe.
Of the present invention how monomer series-connected active equalizer circuit of cell pack, first the positive switch and the negative switch that control corresponding high voltage cell close, control inputs switch closes simultaneously, then them are made all to disconnect, the positive switch and the negative switch that control corresponding low-voltage cell again close, control output switch to close simultaneously, thus realize the equilibrium of high voltage cell to low-voltage cell.Circuit structure is simple, and the switch element of use is less (2N+4, N are battery cell quantity), and extensibility is good.The direct bidirectional energy transfer between any two cells can be realized by the program, solve capacity and the electricity problem of inconsistency of each cell.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present invention;
Fig. 2 Cell10 of the present invention is to the circuit theory diagrams of half period before Cell12 equilibrium;
Fig. 3 is the circuit theory diagrams of Cell10 of the present invention to the later half cycle of Cell12 equilibrium;
Fig. 4 Cell12 of the present invention is to the circuit theory diagrams of half period before Cell10 equilibrium;
Fig. 5 is the circuit theory diagrams of Cell12 of the present invention to the later half cycle of Cell10 equilibrium.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described in detail.
Active equalization circuit of the present invention as shown in Figure 1, each cell (for 12 cells) and one group of electric capacity C1 ~ C12 one_to_one corresponding of series connection are connected in parallel, equalizing circuit comprises DC/DC converter (dotted line frame surrounds part) and the switch arrays of a band isolating transformer, positive switch S1B ~ S12B that switch arrays are used for connecting respectively each cell positive pole by one group of one end is formed for the negative switch S1A ~ S12A being connected each cell negative pole respectively with one group of one end, the other end of each positive switch is shorted together, form a positive pole common port a, the other end of each negative switch is shorted together, form a negative pole common port b, DC/DC converter have two inputs Vin-, Vin+ and two output end vos-, Vo+, two inputs of DC/DC converter are connected respectively positive pole common port a and negative pole common port b by a pair input switch M2, M3, and two outputs of DC/DC converter are connected respectively described positive pole common port a and negative pole common port b by a pair output switch M1, M4.DC/DC converter is a flyback transformer, as other execution modes, can also select the DC/DC converter of the band isolating transformer of other structures.
A point connects (heavy line) via Vo+, Vin+ of switch M1, M2 and DC/DC converter respectively; B point connects (fine line) via Vin-, Vo-of switch M3, M4 and DC/DC converter respectively.The input of DC/DC converter and output Vin+, Vin-, Vo+, Vo-respectively limit winding P former in it are connected with the two ends of vice-side winding S, and concrete connected mode as shown in Figure 1.The connection of switch arrays and battery pack and each cell can realize only by 13 equilibrium lines.Each gating four switches can set up the link circuit between certain cell and DC/DC converter.The size of euqalizing current can be regulated by the inductance of the inner winding of ON time and converter designing switch.Switch in the present embodiment is gate-controlled switch.28 controllable switch S 1A ~ S12A, S1B ~ S12B, M1, M2, M3 and M4 can be realized pipe or relay by MOS.Adopt MOS to compare simple metal-oxide-semiconductor to pipe, the generation of battery pack short circuit can be avoided.
Specific implementation process is as follows, and routine 1:Cell10 is balanced to Cell12.
Suppose that Cell10 voltage is the highest, the minimum electricity of Cell12 voltage is too low, needs Cell10 balanced to Cell12.Assuming that a balanced cycle T is made up of front half period t1 and later half cycle t2, t1=t2=0.5T.First, conducting metal-oxide-semiconductor S10B, S10A, M2 and M3 within the t1 time period, close other all metal-oxide-semiconductors simultaneously, and the energy of Cell10 is stored in the former limit P of converter (as shown in Figure 2), and DC/DC converter works in input pattern; Then, at t2 moment conducting metal-oxide-semiconductor S12B, S12A, M1 and M4, close other all metal-oxide-semiconductors simultaneously, the Energy Coupling that the former limit P of converter stores to secondary S, and then energy trasfer to Cell12(as shown in Figure 3), DC/DC converter works in output mode; Hocketed by above two operation complementations, energy is transferred to Cell12 from Cell10, realizes Cell10 balanced to Cell12.
Example 2:Cell12 is balanced to Cell10.
Suppose that Cell12 voltage is the highest, the minimum electricity of Cell10 voltage is too low, needs Cell12 balanced to Cell10.Same supposition balanced cycle T is made up of front half period t1 and later half cycle t2, t1=t2=0.5T.First, conducting metal-oxide-semiconductor S12B, S12A, M2 and M3 within the t1 time period, close other all metal-oxide-semiconductors simultaneously, and the energy of Cell12 is stored in the former limit P of converter (as shown in Figure 4), and DC/DC converter works in input pattern; Then, at t2 moment conducting metal-oxide-semiconductor S10B, S10A, M1 and M4, close other all metal-oxide-semiconductors simultaneously, the Energy Coupling that the former limit P of converter stores to secondary S, and then energy trasfer to Cell10(as shown in Figure 5), DC/DC converter works in output mode; Hocketed by above two operation complementations, energy is transferred to Cell10 from Cell12, realizes Cell12 balanced to Cell10.
This active equalization circuit both can realize batteries charging equilibrium, can realize battery power discharge equilibrium again, by the direct bidirectional energy transfer between cell and monomer, finally reached the object of all monomer equilibriums.
The invention belongs to non-dissipative equalizing, euqalizing current is large, equalization efficiency is high, extensibility is good, be convenient to realize, battery set charge/discharge equilibrium can be reached, improve the object such as battery charging and discharging ability and service life cycle.This active equalization method has the following advantages:
(1) non-dissipative equalizing technology (or low-loss), time balanced, energy loss is very little, realizes energy-conservation.
(2) big current balancing technique, the ability of equalization can reach more than 10A.
(3) bidirectional equalization technology, can realize the direct bidirectional energy transfer in battery pack between any two cells, equalization efficiency is high.
(4) designs simplification, the control switch negligible amounts selected.
(5) centralized equilibrium, topological structure is simple and practical, easy to connect, and extensibility is fabulous.
Claims (5)
1. monomer series-connected active equalizer circuit of cell pack more than a kind, it is characterized in that, comprise DC/DC converter and the switch arrays of a band isolating transformer, the positive switch that switch arrays are used for connecting respectively each cell positive pole by one group of one end is formed for the negative switch being connected each cell negative pole respectively with one group of one end, the other end of each positive switch is shorted together, form positive pole common port (a), the other end of each negative switch is shorted together, and forms negative pole common port (b); Described DC/DC converter has two inputs (Vin-, Vin+) and two outputs (Vo-, Vo+), two inputs of DC/DC converter are connected respectively described positive pole common port (a) and negative pole common port (b) by a pair input switch (M2, M3), and two outputs of DC/DC converter are connected respectively described positive pole common port (a) and negative pole common port (b) by a pair output switch (M1, M4); Positive input terminal (Vin+), the positive output end (Vo+) of the DC/DC converter of described band isolating transformer connect described positive pole common port (a) respectively by the first switch (M1), second switch (M2), and negative input end (Vin-), negative output terminal (Vo-) connect described negative pole common port (b) respectively by the 3rd switch (M3), the 4th switch (M4); A balanced cycle was made up of front half period and later half cycle; When the front half period starts, the positive switch and the negative switch that control high voltage cell close, input switch (M2, M3) closed, other switch OFF, after first half end cycle, make all switches all disconnect, the later half cycle starts, the positive switch and the negative switch that control low-voltage cell close, and output switch (M1, M4) closes, other switch OFF, thus realize the transfer of high voltage cell to the direct bidirectional energy of low-voltage cell.
2. the how monomer series-connected active equalizer circuit of cell pack of one according to claim 1, is characterized in that, described how monomer series-connected active equalizer circuit of cell pack also comprises one group of electric capacity, and electric capacity is wherein corresponding with each cell in parallel respectively.
3. the how monomer series-connected active equalizer circuit of cell pack of one according to claim 1, is characterized in that, described DC/DC converter is a flyback transformer.
4. the how monomer series-connected active equalizer circuit of cell pack of one according to claim 1, is characterized in that, described positive switch, negative switch, input switch, output switch are relay or switching tube.
5. the how monomer series-connected active equalizer circuit of cell pack of one according to claim 4, is characterized in that, described switching tube is that MOS is to pipe.
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| CN201110451855.2A CN102832653B (en) | 2011-12-29 | 2011-12-29 | The how monomer series-connected active equalizer circuit of cell pack of one |
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| CN201110451855.2A CN102832653B (en) | 2011-12-29 | 2011-12-29 | The how monomer series-connected active equalizer circuit of cell pack of one |
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| CN102832653B true CN102832653B (en) | 2015-09-30 |
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Families Citing this family (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117572A (en) * | 2013-01-28 | 2013-05-22 | 合肥创源车辆控制技术有限公司 | System for realizing remote free flying two-way nondestructive balance through one-way transformer |
| CN103117577B (en) * | 2013-02-04 | 2015-10-28 | 杭州高特电子设备有限公司 | Energy balance circuit for battery pack of electric vehicle |
| CN103117595B (en) * | 2013-03-15 | 2015-02-04 | 山东鲁能智能技术有限公司 | Distributed direct current independent power supply system |
| CN105244552A (en) * | 2013-12-03 | 2016-01-13 | 义乌市运拓光电科技有限公司 | Lithium battery |
| CN104135048B (en) * | 2014-07-17 | 2017-02-15 | 江苏工程职业技术学院 | On-line lithium battery pack equilibrium method |
| CN104393651B (en) * | 2014-12-03 | 2016-09-21 | 安徽贵博新能科技有限公司 | Two-way lossless active equalization device |
| CN104882942A (en) * | 2015-06-15 | 2015-09-02 | 王凤成 | System for controlling internal equalization of modularized lithium battery and equalization among modules |
| KR102516355B1 (en) * | 2015-12-21 | 2023-03-31 | 삼성전자주식회사 | Method and apparatus of controlling battery, and battery pack enabling the method |
| CN105978100B (en) * | 2016-06-28 | 2019-04-19 | 简式国际汽车设计（北京）有限公司 | A kind of battery bidirectional equalization circuit, system and equalization methods |
| 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 |
| CN110785908A (en) * | 2018-11-30 | 2020-02-11 | 深圳市大疆创新科技有限公司 | Active equalization control circuit, method, device, battery, object, and storage medium |
| CN110112809A (en) * | 2019-05-31 | 2019-08-09 | 重庆大学 | A kind of equalizing circuit based on switch arrays |
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| US8129952B2 (en) * | 2009-04-16 | 2012-03-06 | Valence Technology, Inc. | Battery systems and operational methods |
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| US6373226B1 (en) * | 1999-07-30 | 2002-04-16 | Sanyo Electric Co., Ltd. | Method of controlling discharge of a plurality of rechargeable batteries, and battery assembly |
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Effective date of registration: 20220110 Address after: No.1 Jiangdong Avenue, Jintan District, Changzhou City, Jiangsu Province Patentee after: Zhongchuangxin Aviation Technology Co.,Ltd. Address before: 471003 No.16 Chuncheng Road, high tech Zone, Luoyang City, Henan Province Patentee before: CHINA AVIATION LITHIUM BATTERY Co.,Ltd. |