CN202435081U - Active equalization circuit of lithium-ion battery pack - Google Patents
Active equalization circuit of lithium-ion battery pack Download PDFInfo
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- CN202435081U CN202435081U CN2011205646303U CN201120564630U CN202435081U CN 202435081 U CN202435081 U CN 202435081U CN 2011205646303 U CN2011205646303 U CN 2011205646303U CN 201120564630 U CN201120564630 U CN 201120564630U CN 202435081 U CN202435081 U CN 202435081U
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Abstract
The utility model relates to an active equalization circuit of a lithium-ion battery pack. The active equalization circuit comprises a direct current/direct current (DC/DC) convertor and a switch array. The switch array is composed of four groups of switches in corresponding connection with single batteries in the lithium-ion battery pack. One ends of a first group of switches are respectively connected positive poles of the single batteries, and the other ends of the first group of switches are connected in a short-circuit mode and are connected with an input positive end of the DC/DC convertor. One ends of a second group of switches are respectively connected negative poles of the single batteries, and the other ends of the second group of switches are connected in the short-circuit mode and are connected with an input negative end of the DC/DC convertor. One ends of a third group of switches are respectively connected positive poles of the single batteries, and the other ends of the second group of switches are connected in the short-circuit mode and are connected with an output positive end of the DC/DC convertor. One ends of a fourth group of switches are respectively connected negative poles of the single batteries, and the other ends of the second group of switches are connected in the short-circuit mode and are connected with an output negative end of the DC/DC convertor. The active equalization circuit of the lithium-ion battery pack mainly achieves direct bidirectional energy transfer between any two single batteries and finally achieves the purpose of electric quantity equalization of all of single batteries.
Description
Technical field
The utility model relates to initiatively equalizing circuit of a kind of lithium battery group, 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; Battery and MOS switching tube line are too many, system complex; 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.
Be to realize above-mentioned purpose, the scheme of the utility model is: a kind of lithium battery group is equalizing circuit initiatively, comprises a DC/DC converter and switch arrays, switch arrays by with the lithium battery group in four groups of switches of the corresponding connection of each cell constitute; First group of switch one end connects each cell positive pole respectively; Other end short circuit also connects the input anode (Vin+) of said DC/DC converter; Second group of switch one end connects each cell negative pole respectively; Other end short circuit also connects the input negative terminal (Vin-) of said DC/DC converter, and it is anodal that the 3rd group of switch one end connects each cell respectively, and other end short circuit also connects the output plus terminal (Vo+) of said DC/DC converter; The 4th group of switch one end connects each cell negative pole respectively, and other end short circuit also connects the output negative terminal (Vo-) of said DC/DC converter.
Said four groups of switches are relay.
Said DC/DC converter comprises a PWM control end, can dynamically adjust the euqalizing current size.
The battery pack of the utility model is equalizing circuit initiatively, and major function is: realize that the direct and two-way energy between any two cells shifts, 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 (4N, N are battery cell quantity); Switch does not need the high-frequency change action, and circuit is realized easily; Through software control PWM duty ratio, and then dynamic adjustments euqalizing current size.When certain battery cell overtension, during another battery cell brownout, through the respective switch in four groups of corresponding switches of closed two battery cells, first group, second group switch constitutes input circuit, and the 3rd group, the 4th group switch constitutes output loop.
This equalizing circuit both can be used for charge balancing; Can be used for equalization discharge again; It can realize that the direct and two-way energy between inner any two cells of how monomer series-connected battery pack shifts, and reaches energy balance between each cell through rational balance policy.This equilibrium belongs to non-dissipative equalizing, big, the balanced efficient of euqalizing current is high, extensibility is good, be convenient to realization, can improve the battery charging and discharging ability and recycle the life-span.
Description of drawings
Fig. 1 is the circuit theory diagrams of the utility model;
Fig. 2 is that the utility model Cell12 need be to the balanced schematic diagram of Cell10;
Fig. 3 is that the utility model Cell10 need be to the balanced schematic diagram of Cell12.
Embodiment
Below in conjunction with accompanying drawing the utility model is done further detailed explanation.
A kind of lithium battery group is equalizing circuit initiatively, comprises a DC/DC converter and switch arrays, switch arrays by with the lithium battery group in four groups of switches of the corresponding connection of each cell constitute; First group of switch one end connects each cell positive pole respectively; Other end short circuit also connects the input anode Vin+ of said DC/DC converter; Second group of switch one end connects each cell negative pole respectively; Other end short circuit also connects the input negative terminal Vin-of said DC/DC converter, and it is anodal that the 3rd group of switch one end connects each cell respectively, and other end short circuit also connects the output plus terminal Vo+ of said DC/DC converter; The 4th group of switch one end connects each cell negative pole respectively, and other end short circuit also connects the output negative terminal V0-of said DC/DC converter.Above-mentioned switch is relay.
Like the embodiment of Fig. 1, comprise 12 (N) serial lithium battery groups, a DC/DC converter and the switch arrays of forming by the individual switch of 48 (4N).The positive pole of 12 cells is connected in series 12 switches successively (to carry out short circuit behind first group of switch S 1D～S12D), is connected with Vin+ afterwards (shown in the heavy line); The negative pole of 12 cells is connected in series 12 switches successively (to carry out short circuit behind second group of switch S 1B～S12B), is connected with Vin-afterwards (shown in the fine line); The positive pole of 12 cells is connected in series 12 switches successively (to carry out short circuit behind the 3rd group of switch S 1C～S12C), is connected with Vo+ afterwards (shown in the thick dashed line); The negative pole of 12 cells is connected in series 12 switches successively (to carry out short circuit behind the 4th group of switch S 1A～S12A), is connected with Vo-afterwards (shown in the fine dotted line).Through merging, only being connected needs 13 (N+1) root equilibrium line and can realizing of switch arrays and each cell.Each four switches of gating can be set up the link circuit between two cells and the DC/DC converter.Shift through energy between PWM control cell and the cell, start balanced.About the DC/DC converter, present embodiment adopts the PWM code converter, owing to be existing product, so repeat no more.
The practical implementation process is following:
Cell12 need be balanced to Cell10.
Suppose that the Cell12 electric weight is too high, the Cell10 electric weight is low excessively, Cell12 need shift energy to Cell10, then closing relay S12B, S12D, S10A and S10C.At this moment, the Cell12 both positive and negative polarity is connected with Vin-with the Vin+ of DC/DC converter respectively, and the both positive and negative polarity of Cell10 is connected with Vo-with the Vo+ of DC/DC converter respectively.Enable pwm signal, the balanced startup, the energy of Cell12 shifts to Cell10 through DC/DC.Balanced schematic diagram and current direction under this situation are as shown in Figure 2.
Cell10 need be balanced to Cell12.
Suppose that the Cell10 electric weight is too high, the Cell12 electric weight is low excessively, Cell10 need shift energy to Cell12, then closing relay S12A, S12C, S10B and S10D.At this moment, the Cell10 both positive and negative polarity is connected with Vin-with the Vin+ of DC/DC converter respectively, and the both positive and negative polarity of Cell12 is connected with Vo-with the Vo+ of DC/DC converter respectively, enables pwm signal, the balanced startup, and the energy of Cell10 shifts to Cell12 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, shifted through the direct and two-way energy between cell and the cell, finally reached the balanced purpose of all monomer electric weight.
The utility model belongs to non-dissipative equalizing, big, the balanced efficient of euqalizing current is high, extensibility is good, be convenient to realization, can reach the battery set charge/discharge equilibrium, improve purposes such as battery charging and discharging ability and useful life.
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 any two cells shifts in the battery pack, and the switch that is used to control do not need high frequency to switch, and reliability and stability promote greatly.
(4) collecting and distributing type design, topological structure is simple and practical, and is easy to connect, and extensibility is fabulous.
Claims (3)
1. lithium battery group equalizing circuit initiatively is characterized in that, comprises a DC/DC converter and switch arrays, switch arrays by with the lithium battery group in four groups of switches of the corresponding connection of each cell constitute; First group of switch one end connects each cell positive pole respectively; Other end short circuit also connects the input anode (Vin+) of said DC/DC converter; Second group of switch one end connects each cell negative pole respectively; Other end short circuit also connects the input negative terminal (Vin-) of said DC/DC converter, and it is anodal that the 3rd group of switch one end connects each cell respectively, and other end short circuit also connects the output plus terminal (Vo+) of said DC/DC converter; The 4th group of switch one end connects each cell negative pole respectively, and other end short circuit also connects the output negative terminal (Vo-) of said DC/DC converter.
2. lithium battery group according to claim 1 is equalizing circuit initiatively, it is characterized in that said four groups of switches are relay.
3. lithium battery group according to claim 1 is equalizing circuit initiatively, it is characterized in that said DC/DC converter comprises a PWM control end, can dynamically adjust the euqalizing current size.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205646303U CN202435081U (en) | 2011-12-29 | 2011-12-29 | Active equalization circuit of lithium-ion battery pack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205646303U CN202435081U (en) | 2011-12-29 | 2011-12-29 | Active equalization circuit of lithium-ion battery pack |
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| Publication Number | Publication Date |
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| CN202435081U true CN202435081U (en) | 2012-09-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011205646303U Expired - Lifetime CN202435081U (en) | 2011-12-29 | 2011-12-29 | Active equalization circuit of lithium-ion battery pack |
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| CN (1) | CN202435081U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832652A (en) * | 2011-12-29 | 2012-12-19 | 中航锂电（洛阳）有限公司 | Active equalizer circuit of lithium cell pack |
| CN103823118A (en) * | 2014-02-25 | 2014-05-28 | 中航锂电（洛阳）有限公司 | Device and method for measuring internal resistance of battery cells during equalization |
| CN104578322A (en) * | 2015-01-30 | 2015-04-29 | 天津工业大学 | Battery pack energy balance structure and implementation method thereof |
| CN107910919A (en) * | 2017-12-04 | 2018-04-13 | 华中科技大学 | A kind of lithium battery group equalizing structure and method |
-
2011
- 2011-12-29 CN CN2011205646303U patent/CN202435081U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102832652A (en) * | 2011-12-29 | 2012-12-19 | 中航锂电（洛阳）有限公司 | Active equalizer circuit of lithium cell pack |
| CN103823118A (en) * | 2014-02-25 | 2014-05-28 | 中航锂电（洛阳）有限公司 | Device and method for measuring internal resistance of battery cells during equalization |
| CN104578322A (en) * | 2015-01-30 | 2015-04-29 | 天津工业大学 | Battery pack energy balance structure and implementation method thereof |
| CN107910919A (en) * | 2017-12-04 | 2018-04-13 | 华中科技大学 | A kind of lithium battery group equalizing structure and method |
| CN107910919B (en) * | 2017-12-04 | 2019-07-05 | 华中科技大学 | A kind of lithium battery group equalizing structure and method |
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| Date | Code | Title | Description |
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| 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: 20220107 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 |