CN202435080U - Active equalization circuit of battery pack formed by connecting multiple single batteries in series - Google Patents
Active equalization circuit of battery pack formed by connecting multiple single batteries in series Download PDFInfo
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- CN202435080U CN202435080U CN2011205632673U CN201120563267U CN202435080U CN 202435080 U CN202435080 U CN 202435080U CN 2011205632673 U CN2011205632673 U CN 2011205632673U CN 201120563267 U CN201120563267 U CN 201120563267U CN 202435080 U CN202435080 U CN 202435080U
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Abstract
The utility model relates to an active equalization circuit of a battery pack formed by connecting multiple single batteries in series. The active equalization circuit comprises a direct current/direct current (DC/DC) convertor with an isolation transformer and a switch array. The switch array is composed of a group of positive pole switches with one ends for being respectively connected with positive poles of the single batteries and a group of negative pole switches with one ends for being respectively connected with negative poles of the single batteries, the other ends of the positive pole switches are connected together in a short-circuit mode to form a positive pole common end, and the other ends of the negative pole switches are connected together through short circuit to form a negative pole common end. Two input ends of the DC/DC convertor are respectively and correspondingly connected with the positive pole common end and the negative pole common end through a pair of input switches, and two output ends of the DC/DC convertor are respectively and correspondingly connected with the positive pole common end and the negative pole common end through a pair of output switches. By means of the scheme, direct bidirectional energy transfer between any two single batteries can be achieved, and the capacity of the single batteries and inconsistency of electric quantity are solved.
Description
Technical field
The utility model relates to initiatively equalizing circuit of a kind of battery pack, relates in particular to initiatively equalizing circuit of a kind of how monomer series-connected dynamic lithium battery group.
Background technology
The application of lithium ion battery, especially lithium-ion-power cell more and more widely becomes an important directions of new energy technology development.The capacity of cell is big more, and the capacity volume variance of cell is also just big more.There are two types of inconsistencies in big capacity lithium ion battery in the use in groups, and first kind inconsistency is caused by actual capacity difference, and second type of inconsistency caused by initial electric weight difference.Because inconsistency, certain monomer can be full of at first in the charging process, and the emptying at first of certain monomer is arranged again in the discharge process, these drawbacks limit the charging and discharging capabilities of whole battery group.Along with the increase of cycle-index, the battery inconsistency can be aggravated gradually, has had a strong impact on battery performance.This difficult problem has proposed new challenge to battery management system, promptly when battery set charge/discharge, realizes balanced.
The conventional battery management system much has equalization function, but the ability of equalization is limited, can't solve two types of inconsistencies of battery fully.Recently, be that the active equalization of representative has obtained extensive studies with the DC/DC converter, initiatively equalization also becomes the balanced developing direction of battery management system.This method can realize bidirectional equalization, and euqalizing current is big, efficient is high, can effectively alleviate and solve the inconsistency that battery shows in the use in groups.But existing active equalizing system, its circuit constitute more complicated, switch element uses too much.Like application number is 201020266091.0 Chinese utility model patent, and this device adopts the MOS switching tube to realize that equalization channel switches, and simple metal-oxide-semiconductor causes the battery pack short circuit easily, realizes difficulty; And battery pack and aerial lug are too many in this scheme, and MOS switching tube path is too many, system complex.
The utility model content
The purpose of the utility model provides initiatively equalizing circuit of the simple how monomer series-connected battery pack of a kind of circuit, in order to solve the existing initiatively baroque problem of equalizing circuit.
For realizing above-mentioned purpose; The scheme of the utility model is: a kind of how monomer series-connected battery pack is equalizing circuit initiatively; The DC/DC converter and the switch arrays that comprise a band isolating transformer; Switch arrays are used for connecting respectively the negative switch that the anodal positive switch of each cell and one group of one end be used for being connected respectively each cell negative pole by one group of one end and constitute, and the other end short circuit of each positive switch forms an anodal common port (a) together; The other end short circuit of each negative switch forms a negative pole common port (b) together; Said DC/DC converter has two inputs (Vin-, Vin+) and two outputs (Vo-, Vo+); Two inputs of DC/DC converter are through corresponding respectively said anodal common port (a) and the negative pole common port (b) of connecting of a pair of input switch (M2, M3), and two outputs of DC/DC converter are through corresponding respectively said anodal common port (a) and the negative pole common port (b) of connecting of a pair of output switch (M1, M4).
Said how monomer series-connected battery pack initiatively equalizing circuit also comprises one group of electric capacity, corresponding with each cell respectively parallel connection of electric capacity wherein.
Said DC/DC converter is an anti-violent change depressor.
Said positive switch, negative switch, input switch, output switch are relay or switching tube.Said switching tube is that MOS is to pipe.
The how monomer series-connected battery pack of the utility model is equalizing circuit initiatively; Positive switch and the negative switch of at first controlling corresponding high voltage cell are closed; Control the input switch closure simultaneously, make their whole disconnections then, positive switch and the negative switch of controlling corresponding low-voltage cell again are closed; The switch closure of control output simultaneously, thus realize of the equilibrium of high voltage cell to the low-voltage cell.Circuit structure is simple, the switch element of use less (2N+4, N are battery cell quantity), and extensibility is good.Can realize that through this scheme the direct and two-way energy between any two cells shifts, and solves the capacity and the electric weight problem of inconsistency of each cell.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model;
Fig. 2 is that the utility model Cell10 is to the Cell12 circuit theory diagrams of balanced preceding half period;
Fig. 3 is that the utility model Cell10 is to the Cell12 circuit theory diagrams in balanced later half cycle;
Fig. 4 is that the utility model Cell12 is to the Cell10 circuit theory diagrams of balanced preceding half period;
Fig. 5 is that the utility model Cell12 is to the Cell10 circuit theory diagrams in balanced later half cycle.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further detailed explanation.
The active equalizing circuit of the utility model is as shown in Figure 1; Each cell (is example with 12 cells) and one group of corresponding one by one being connected in parallel of capacitor C 1～C12 of series connection; Equalizing circuit comprises the DC/DC converter (frame of broken lines encirclement part) and the switch arrays of a band isolating transformer; Switch arrays are used for connecting respectively the anodal positive switch S1B～S12B of each cell by one group of one end and constitute with negative switch S1A～S12A that one group of one end is used for being connected respectively each cell negative pole, and the other end short circuit of each positive switch forms an anodal common port a together; The other end short circuit of each negative switch forms a negative pole common port b together; The DC/DC converter have two input Vin-, Vin+ and two output end vos-, Vo+; Two inputs of DC/DC converter are through corresponding respectively anodal common port a and the negative pole common port b of connecting of a pair of input switch M2, M3, and two outputs of DC/DC converter are through corresponding respectively said anodal common port a and the negative pole common port b of connecting of a pair of output switch M1, M4.The DC/DC converter is an anti-violent change depressor, as other execution modes, can also select the DC/DC converter of the band isolating transformer of other structures for use.
The a point is connected (heavy line) via switch M1, M2 with Vo+, the Vin+ of DC/DC converter respectively; The b point is connected (fine line) via switch M3, M4 with Vin-, the Vo-of DC/DC converter respectively.The input of DC/DC converter and output Vin+, Vin-, Vo+, Vo-are connected with the two ends of its former limit winding P and secondary winding S respectively, and concrete connected mode is as shown in Figure 1.Switch arrays can be realized through 13 equilibrium lines with only being connected of battery pack and each cell.Each four switches of gating can be set up the link circuit between certain cell and the DC/DC converter.The size that the inductance of the inner winding of ON time and converter through the design switch can be regulated euqalizing current.Switch in the present embodiment is a 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 that pipe is compared simple metal-oxide-semiconductor, can avoid the generation of battery pack short circuit.
The practical implementation process is following, and routine 1:Cell10 is balanced to Cell12.
Suppose that Cell10 voltage is the highest, the minimum electric weight of Cell12 voltage is low excessively, needs Cell10 balanced to Cell12.Suppose that a balanced cycle T forms t1=t2=0.5T by preceding half period t1 and later half cycle t2.At first, at t1 conducting metal-oxide-semiconductor S10B, S10A, M2 and M3 in the time period, close other all metal-oxide-semiconductors simultaneously, the energy of Cell10 deposits among the former limit P of converter (as shown in Figure 2), and the DC/DC converter works in input pattern; Then, at t2 constantly conducting metal-oxide-semiconductor S12B, S12A, M1 and M4, close other all metal-oxide-semiconductors simultaneously, the energy of the former limit P storage of converter is coupled to secondary S, and then energy is transferred to Cell12 (as shown in Figure 3), and the DC/DC converter works in output mode; Hocket through above two operation complementations, energy is transferred to Cell12 from Cell10, realizes that Cell10 is balanced to Cell12.
Example 2:Cell12 is balanced to Cell10.
Suppose that Cell12 voltage is the highest, the minimum electric weight of Cell10 voltage is low excessively, needs Cell12 balanced to Cell10.Balanced cycle T of same supposition is formed t1=t2=0.5T by preceding half period t1 and later half cycle t2.At first, at t1 conducting metal-oxide-semiconductor S12B, S12A, M2 and M3 in the time period, close other all metal-oxide-semiconductors simultaneously, the energy of Cell12 deposits among the former limit P of converter (as shown in Figure 4), and the DC/DC converter works in input pattern; Then, at t2 constantly conducting metal-oxide-semiconductor S10B, S10A, M1 and M4, close other all metal-oxide-semiconductors simultaneously, the energy of the former limit P storage of converter is coupled to secondary S, and then energy is transferred to Cell10 (as shown in Figure 5), and the DC/DC converter works in output mode; Hocket through above two operation complementations, energy is transferred to Cell10 from Cell12, realizes that Cell12 is balanced to Cell10.
This active equalizing circuit both can realize that batteries charging was balanced, can realize that again battery power discharge is balanced, shifted through the direct and two-way energy between cell and the monomer, finally reached the balanced purpose of all monomers.
The utility model belongs to that big, the balanced efficient of non-dissipative equalizing, euqalizing current is high, extensibility is good, is convenient to realize, can reach the battery set charge/discharge equilibrium, improves the battery charging and discharging ability and recycle purpose such as life-span.This active equalization methods has the following advantages:
(1) non-dissipative equalizing technology (or low-loss), energy loss is very little when balanced, realizes energy-conservation.
(2) big current balance technology, the ability of equalization can reach more than the 10A.
(3) bidirectional equalization technology can realize that the direct and two-way energy between any two cells shifts in the battery pack, and balanced efficient is high.
(4) designs simplification, the control switch negligible amounts of selecting for use.
(5) centralized equilibrium, topological structure is simple and practical, and is easy to connect, and extensibility is fabulous.
Claims (5)
1. the equalizing circuit initiatively of monomer series-connected battery pack more than a kind; It is characterized in that; The DC/DC converter and the switch arrays that comprise a band isolating transformer; Switch arrays are used for connecting respectively the negative switch that the anodal positive switch of each cell and one group of one end be used for being connected respectively each cell negative pole by one group of one end and constitute, and the other end short circuit of each positive switch forms an anodal common port (a) together; The other end short circuit of each negative switch forms a negative pole common port (b) together; Said DC/DC converter has two inputs (Vin-, Vin+) and two outputs (Vo-, Vo+); Two inputs of DC/DC converter are through corresponding respectively said anodal common port (a) and the negative pole common port (b) of connecting of a pair of input switch (M2, M3), and two outputs of DC/DC converter are through corresponding respectively said anodal common port (a) and the negative pole common port (b) of connecting of a pair of output switch (M1, M4).
2. according to claim 1 how monomer series-connected battery pack is equalizing circuit initiatively, it is characterized in that, said how monomer series-connected battery pack initiatively equalizing circuit also comprises one group of electric capacity, corresponding with each cell respectively parallel connection of electric capacity wherein.
3. according to claim 1 how monomer series-connected battery pack is equalizing circuit initiatively, it is characterized in that said DC/DC converter is an anti-violent change depressor.
4. according to claim 1 how monomer series-connected battery pack is equalizing circuit initiatively, it is characterized in that said positive switch, negative switch, input switch, output switch are relay or switching tube.
5. according to claim 4 how monomer series-connected battery pack is equalizing circuit initiatively, it is characterized in that, said switching tube is that MOS is to pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205632673U CN202435080U (en) | 2011-12-29 | 2011-12-29 | Active equalization circuit of battery pack formed by connecting multiple single batteries in series |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205632673U CN202435080U (en) | 2011-12-29 | 2011-12-29 | Active equalization circuit of battery pack formed by connecting multiple single batteries in series |
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| CN202435080U true CN202435080U (en) | 2012-09-12 |
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| CN2011205632673U Expired - Lifetime CN202435080U (en) | 2011-12-29 | 2011-12-29 | Active equalization circuit of battery pack formed by connecting multiple single batteries in series |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN105281400A (en) * | 2014-07-03 | 2016-01-27 | 西门子公司 | Apparatus and method for state of charge compensation for a battery system |
| 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 |
| CN107039687A (en) * | 2016-02-04 | 2017-08-11 | 北京波士顿动力电池有限公司 | A kind of non-dissipative equalizing circuit for electric automobile power battery |
| CN107872088A (en) * | 2017-12-13 | 2018-04-03 | 华南理工大学 | A kind of active equalizer circuit of cell pack and equalization methods |
| CN110112809A (en) * | 2019-05-31 | 2019-08-09 | 重庆大学 | A kind of equalizing circuit based on switch arrays |
-
2011
- 2011-12-29 CN CN2011205632673U patent/CN202435080U/en not_active Expired - Lifetime
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102832653B (en) * | 2011-12-29 | 2015-09-30 | 中航锂电（洛阳）有限公司 | The how monomer series-connected active equalizer circuit of cell pack of one |
| CN105281400A (en) * | 2014-07-03 | 2016-01-27 | 西门子公司 | Apparatus and method for state of charge compensation for a battery system |
| US9787107B2 (en) | 2014-07-03 | 2017-10-10 | Siemens Aktiengesellschaft | Apparatus and method for state of charge compensation for a battery system |
| CN105281400B (en) * | 2014-07-03 | 2018-05-11 | 西门子公司 | For the apparatus and method for battery system equilibrium charging state |
| 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 |
| CN107039687A (en) * | 2016-02-04 | 2017-08-11 | 北京波士顿动力电池有限公司 | A kind of non-dissipative equalizing circuit for electric automobile power battery |
| CN107872088A (en) * | 2017-12-13 | 2018-04-03 | 华南理工大学 | A kind of active equalizer circuit of cell pack and equalization methods |
| 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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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120912 |
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| CX01 | Expiry of patent term | ||
| TR01 | Transfer of patent right |
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. |
|
| TR01 | Transfer of patent right |