CN202435082U - Active equalization circuit for battery pack - Google Patents
Active equalization circuit for battery pack Download PDFInfo
- Publication number
- CN202435082U CN202435082U CN2011205646712U CN201120564671U CN202435082U CN 202435082 U CN202435082 U CN 202435082U CN 2011205646712 U CN2011205646712 U CN 2011205646712U CN 201120564671 U CN201120564671 U CN 201120564671U CN 202435082 U CN202435082 U CN 202435082U
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- CN
- China
- Prior art keywords
- converter
- battery pack
- switch
- positive
- negative
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/18—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries of two or more battery modules
- B60L58/22—Balancing the charge of battery modules
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
Abstract
The utility model relates to an active equalization circuit for a battery pack. The circuit comprises an input/output reversible DC (direct current)/DC converter and a switch array, wherein the switch array is formed by a group of positive electrode switches with one ends respectively connected with the positive electrodes of single batteries and a group of negative electrode switches with one ends respectively connected with the negative electrodes of the single batteries; the other ends of the positive electrode switches are connected with a positive electrode (V2+) at the first DC terminal of the DC/DC converter; the other ends of the negative electrode switches are connected with a negative electrode (V2-) at the first DC terminal of the DC/DC converter; the DC/DC converter also comprises a second DC terminal (V1+, V1-); and a control switch (S13) is arranged on a loop connecting the second DC terminal (V1+, V1-) with the positive and negative electrodes of a battery pack in series. The circuit has the main functions of not only achieving charge equalization of the battery pack but also achieving discharge equalization of the battery pack.
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; This device adopts monomer and cell equilibrium, can't realize that the direct and two-way energy between cell and the battery pack shifts; In addition, the MOS switching tube in this scheme needs high frequency action, control is required too high, influences reliability.
The utility model content
The purpose of the utility model provides initiatively equalizing circuit of the simple battery pack of a kind of circuit, in order to solve existing initiatively equalizing circuit complex structure, to control demanding problem.
For realizing above-mentioned purpose; The scheme of the utility model is: a kind of battery pack is equalizing circuit initiatively; Comprise a DC/DC converter and the switch arrays that input and output are reversible; 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 of each positive switch connects the positive pole (V2+) of the first direct current terminals of said DC/DC converter, and the other end of each negative switch connects the negative pole (V2-) of the first direct current terminals of said DC/DC converter; Said DC/DC converter also comprises the second direct current terminals (V1+; V1-), the second direct current terminals (V1+, V1-) with loop that the battery pack both positive and negative polarity is connected in string be provided with a control switch (S13).
Said positive switch, negative switch, control switch are relay.
The reversible DC/DC converter of said input and output changes high pressure by a low pressure and a high pressure changes the unidirectional DC/DC converter combination realization of low pressure.
The reversible DC/DC converter of said input and output comprises two PWM control ends, can dynamically adjust the euqalizing current size and Orientation.
The battery pack of the utility model is equalizing circuit initiatively; Major function is: realize that the energy between battery pack and the wherein any cell shifts; Both can realize that batteries charging was balanced; Can realize that again battery power discharge is balanced, finally reach the balanced purpose of all monomer electric weight, alleviate the problem of inconsistency of monomer capacity.And the circuit structure of the utility model is simple, the number of switches that is adopted less (2N+1, N are battery cell quantity).Through adopting reversible DC/DC converter; When certain battery cell overtension; Through corresponding positive switch and the negative switch of closed this battery cell, and corresponding control switch, make the first direct current terminals be input; The second direct current terminals are transferred to battery pack for output with the cell energy; When certain battery cell overtension, through corresponding positive switch and the negative switch of closed this battery cell, and corresponding control switch, make the first direct current terminals be output, the second direct current terminals shift cell for input with battery pack power.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model;
Fig. 2 is that the utility model battery pack is to the balanced schematic diagram of Cell11;
Fig. 3 is the schematic diagram of the utility model Cell11 to battery pack balancing.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further detailed explanation.
A kind of battery pack is equalizing circuit initiatively; Comprise a DC/DC converter and the switch arrays that input and output are reversible; 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; The other end of each positive switch connects the anodal V2+ of the first direct current terminals of said DC/DC converter; The other end of each negative switch connects the negative pole V2-of the first direct current terminals of said DC/DC converter, and said DC/DC converter also comprises the second direct current terminals V1+, V1-; The second direct current terminals V1+, string is provided with control switch S13 in V1-and the loop that the battery pack both positive and negative polarity is connected.Above-mentioned switch is relay.In general, control switch is established one, and is connected battery anode, like the S13 among Fig. 1.Execute mode as other facts, also can also increase a contact at the battery pack negative pole.
Like the embodiment of Fig. 1, comprise the switch arrays that 12 (N) serial lithium battery groups, DC/DC converter and the individual switch of 25 (2N+1) are formed.The positive pole of 12 cells is successively through 12 positive switch (S1+～S12+) be connected (dotted line) with the V2+ terminal of DC/DC converter; The negative pole of 12 cells is successively through 12 negative switch (S1-～S12-) be connected (solid line) with the V2-terminal of DC/DC converter; Battery pack is total just to be connected (dotted line) through switch S 13 with the V1+ terminal of DC/DC converter, and the V1-terminal of DC/DC converter is directly always born with battery pack and is connected (solid line).Through merging, switch arrays can be realized through 13 (N+1) root equilibrium line with only being connected of battery pack and each cell.Each three switches of gating (S13 is essential) can be set up certain cell and DC/DC converter, and the link circuit between DC/DC converter and the battery pack.The reversible converter of DC/DC converter using input output of the prior art is provided with 2 PWM Enable Pins, shifts to the cell energy to battery pack or battery pack through PWM control cell, to carry out equilibrium.
The practical implementation process is following:
Battery pack shifts energy to cell.
PWM1 enables, and the DC/DC converter is set to from high pressure to the low pressure translative mode, and V1+ and V1-are the input of DC/DC converter, and V2+ and V2-are output, realizes that battery pack shifts energy to cell.Suppose that the Cell11 electric weight is low excessively, need battery pack to shift energy, then closing relay S11+, S11-and S13 to Cell11.The battery pack both positive and negative polarity is connected with V1-with the V1+ of DC/DC converter respectively, and the both positive and negative polarity of Cell11 is connected with V2-with the V2+ of DC/DC converter respectively with S11-via S11+, and the energy of battery pack shifts to Cell11 through DC/DC.Principle and current direction under this situation are as shown in Figure 2.
Cell shifts energy to battery pack.
PWM2 enables, and the DC/DC converter is set to from low pressure to the high pressure translative mode, and V1+ and V1-are the output of DC/DC converter, and V2+ and V2-are input, realizes that cell shifts energy to battery pack.Suppose that the Cell10 electric weight is too high, need Cell10 to shift energy, then closing relay S10+, S10-and S13 to battery pack.The battery pack both positive and negative polarity is connected with V1-with the V1+ of DC/DC converter respectively, and the both positive and negative polarity of Cell10 is connected with V2-with the V2+ of DC/DC converter respectively with S10-via S10+, and the energy of Cell11 shifts to battery pack through DC/DC.Circuit theory diagrams and current direction under this situation are as shown in Figure 3.
This active equalizing circuit both can realize that batteries charging was balanced; Can realize that again battery power discharge is balanced; Direct and two-way energy through between cell and the battery pack shifts, and finally reaches the balanced purpose of all monomer electric weight, alleviates the inconsistency of monomer capacity.
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.
Because the technique scheme utilization, this active equalization methods and existing data by MoM and MEI have 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 cell and the battery pack shifts, and balanced efficient is high.
(4) topological structure is simple and practical, and is easy to connect, and extensibility is fabulous.
Claims (4)
1. battery pack equalizing circuit initiatively; It is characterized in that; Comprise a DC/DC converter and the switch arrays that input and output are reversible; 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 of each positive switch connects the positive pole (V2+) of the first direct current terminals of said DC/DC converter, and the other end of each negative switch connects the negative pole (V2-) of the first direct current terminals of said DC/DC converter; Said DC/DC converter also comprises the second direct current terminals (V1+; V1-), the second direct current terminals (V1+, V1-) with loop that the battery pack both positive and negative polarity is connected in string be provided with a control switch (S13).
2. battery pack according to claim 1 is equalizing circuit initiatively, it is characterized in that said positive switch, negative switch, control switch are relay.
3. battery pack according to claim 1 is equalizing circuit initiatively, it is characterized in that, the reversible DC/DC converter of said input and output changes high pressure by a low pressure and a high pressure changes the unidirectional DC/DC converter combination realization of low pressure.
4. battery pack according to claim 1 is equalizing circuit initiatively, and its characteristic is that also the reversible DC/DC converter of said input and output comprises two PWM control ends, can dynamically adjust the euqalizing current size and Orientation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205646712U CN202435082U (en) | 2011-12-29 | 2011-12-29 | Active equalization circuit for battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205646712U CN202435082U (en) | 2011-12-29 | 2011-12-29 | Active equalization circuit for battery pack |
Publications (1)
| Publication Number | Publication Date |
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| CN202435082U true CN202435082U (en) | 2012-09-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205646712U Expired - Lifetime CN202435082U (en) | 2011-12-29 | 2011-12-29 | Active equalization circuit for battery pack |
Country Status (1)
| Country | Link |
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| CN (1) | CN202435082U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832654A (en) * | 2011-12-29 | 2012-12-19 | 中航锂电（洛阳）有限公司 | Active equalizer circuit of cell pack |
| WO2014146596A1 (en) * | 2013-03-21 | 2014-09-25 | Shenzhen Byd Auto R & D Company Limited | Power supply system for electric vehicle and method for controlling the same |
| JP2020520217A (en) * | 2017-11-06 | 2020-07-02 | エルジー・ケム・リミテッド | Cell module equalization and precharge apparatus and method |
| CN112677822A (en) * | 2020-12-15 | 2021-04-20 | 台州市路桥鼎新阳光机电科技有限公司 | Battery management system |
-
2011
- 2011-12-29 CN CN2011205646712U patent/CN202435082U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832654A (en) * | 2011-12-29 | 2012-12-19 | 中航锂电（洛阳）有限公司 | Active equalizer circuit of cell pack |
| CN102832654B (en) * | 2011-12-29 | 2015-07-15 | 中航锂电（洛阳）有限公司 | Active equalizer circuit of cell pack |
| WO2014146596A1 (en) * | 2013-03-21 | 2014-09-25 | Shenzhen Byd Auto R & D Company Limited | Power supply system for electric vehicle and method for controlling the same |
| EP2976234A4 (en) * | 2013-03-21 | 2016-11-16 | Byd Co Ltd | Power supply system for electric vehicle and method for controlling the same |
| US10118498B2 (en) | 2013-03-21 | 2018-11-06 | Byd Company Limited | Power supply system for electric vehicle and method for controlling the same |
| JP2020520217A (en) * | 2017-11-06 | 2020-07-02 | エルジー・ケム・リミテッド | Cell module equalization and precharge apparatus and method |
| JP7088495B2 (en) | 2017-11-06 | 2022-06-21 | エルジー エナジー ソリューション リミテッド | Cell module equalization and precharging device, and method |
| CN112677822A (en) * | 2020-12-15 | 2021-04-20 | 台州市路桥鼎新阳光机电科技有限公司 | Battery management system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20211227 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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20120912 |
|
| CX01 | Expiry of patent term |