CN101789609B - Battery equalization system, method and circuit - Google Patents
Battery equalization system, method and circuit Download PDFInfo
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- CN101789609B CN101789609B CN 200910001193 CN200910001193A CN101789609B CN 101789609 B CN101789609 B CN 101789609B CN 200910001193 CN200910001193 CN 200910001193 CN 200910001193 A CN200910001193 A CN 200910001193A CN 101789609 B CN101789609 B CN 101789609B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000004891 communication Methods 0.000 claims description 16
- 238000005070 sampling Methods 0.000 claims description 15
- 238000012544 monitoring process Methods 0.000 claims description 13
- 108010022579 ATP dependent 26S protease Proteins 0.000 description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910018095 Ni-MH Inorganic materials 0.000 description 1
- 229910018477 Ni—MH Inorganic materials 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
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Abstract
The invention discloses battery equalization system, a method and a circuit thereof. The battery equalization system comprises at least two battery modules and a controller, wherein each battery module comprises a plurality of batteries, a plurality of equalization circuits corresponding to the plurality of batteries, and a battery management module. The battery management module is connected with the plurality of batteries for acquiring the battery voltages of the batteries. The plurality of equalization circuits are connected with the plurality of batteries respectively for equalizing the batteries under the control of the battery management module. The controller is connected with each of the battery modules respectively for acquiring the minimum battery voltage of each battery module, and generating a reference signal on the basis of the minimum battery voltages of the battery modules. The battery management module in each battery module controls the plurality of equalization circuits to equalize the batteries according to the reference signal so as to obtain the battery equalization of at least two battery modules. The invention can improve the efficiency of the battery system and reduce the power consumption.
Description
Technical field
The present invention relates to the management of battery system, refer to the system and method for balancing battery especially.
Background technology
The battery balanced battery pack that is used to comprise a plurality of batteries.If unbalanced words between the battery, because the capacity of the most weak meeting decision whole battery group in the series connected battery, at this moment the capacity of battery pack will reduce.When the difference between cell voltage during greater than certain level, battery is unbalanced will to be taken place.In battery system, the information of battery can be measured by the circuit of chip or printed circuit board (PCB).According to measurement result, the battery management circuit can be controlled battery balanced.In comprising the big relatively battery management system of a plurality of battery modules, the equilibrium of battery can be carried out in each battery module.
Fig. 1 is the existing structural representation that is used for battery balanced existing system 100.System 100 comprises the battery module 182 and 184 of similar.Battery module 182 comprises battery 102 and 104, battery equalizing circuit 122 and 124, battery voltage sampling circuit 132,134,136 and 138, module equalizing circuit 112 and battery management module 162.Battery module 184 comprises battery 106 and 108, battery equalizing circuit 126 and 128, battery voltage sampling circuit 142,144,146 and 148, module equalizing circuit 114 and battery management module 166.
The voltage of battery voltage sampling circuit 132,134,136 and 138 monitoring batteries 102 and 104.Battery management module 162 obtains the voltage that samples and therefrom chooses a reference voltage (such as minimum voltage) from battery voltage sampling circuit 132,134,136 and 138.Battery management module 162 can compare respectively reference voltage and the voltage that samples.If battery management module 162 detects reference voltage and the cell voltage that samples, 102 or 104 cell voltage for example, the difference between it is during greater than predetermined threshold, the electric current that battery management module 162 can these batteries of control battery equalizing circuits shunting.Like this, according to reference voltage, battery 102 and 104 voltage can obtain equilibrium in battery module 182. Battery 106 and 108 voltage can be balanced through similarity method.
In system 100, battery module 182 and 184 is only being done equilibrium in the module separately.If imbalance takes place between battery module 182 and 184, module equalizing circuit 112 and 114 can only be used for the electric current shunting of entire cell module 182 or 184.Yet in this case, the efficient of battery system will reduce.And for battery balanced and make that the electric current of entire cell module is shunted, power consumption also can increase like this.
Summary of the invention
The present invention provides a kind of battery equalization system; This battery equalization system comprises: at least two battery modules; Each said battery module comprises a plurality of batteries; Corresponding to a plurality of equalizing circuits and the battery management module of said a plurality of batteries, said battery management module is connected the cell voltage that is used to obtain said a plurality of batteries with said a plurality of batteries, and said a plurality of equalizing circuits are connected with said a plurality of batteries respectively and are used under the control of said battery management module, unbalanced battery being carried out equilibrium; And controller; Be connected with each said battery module respectively; Be used for receiving respectively the minimum cell voltage that each said battery module provides; And more said minimum cell voltage to be to produce a reference signal, and wherein the battery management module in each said battery module is controlled said a plurality of equalizing circuit and according to said reference signal unbalanced battery carried out balancedly, obtains battery balanced between said at least two battery modules with this.
Battery equalization system of the present invention, each said battery module further comprises the voltage sampling circuit that is connected between said a plurality of battery and the said battery management module, said voltage sampling circuit is used to detect said cell voltage.
Battery equalization system of the present invention, said reference signal refer to the minimum value in the said minimum cell voltage that said at least two battery modules provide.
Battery equalization system of the present invention, the battery management module of each said battery module comprises single-chip microcomputer, the cell voltage of each battery that is used for more said battery module is to produce said minimum cell voltage.
Battery equalization system of the present invention, said controller is sent to said battery management module with said reference signal, and said battery management module compares the voltage of each said battery and said reference signal to decide and is performed balanced battery.
Battery equalization system of the present invention, said at least two battery modules receive said reference signal, and are performed the battery of said equilibrium based on said reference signal decision.
Battery equalization system of the present invention, the difference of voltage and said reference signal that be performed the said battery of said equilibrium surpasses preset threshold value.
Battery equalization system of the present invention, said controller is connected with each said battery module respectively through communication bus.
The present invention also provides a kind of battery balanced method that is used between at least two battery modules, and each said battery module comprises a plurality of batteries, and said battery balanced method comprises: the cell voltage of monitoring a plurality of batteries in each said battery module; Receive the minimum cell voltage of each said battery module respectively, and more said minimum cell voltage is to produce a reference signal; Based on said reference signal, in said at least two battery modules, specify to be performed balanced battery; With carry out said equilibrium in the battery of appointment, between said two battery modules, obtain battery balanced at least with this.
The step that the battery balanced method that is used between at least two battery modules of the present invention, said appointment are performed balanced battery comprises: the voltage of the cell voltage of more said battery and said reference signal respectively; With when the voltage difference that relatively obtains exceeds preset threshold value, decision is the battery of said appointment by battery relatively.
The battery balanced method that is used between at least two battery modules of the present invention is carried out equilibrium and is comprised in the step of the battery of appointment: drives battery equalizing circuit based on said reference signal; With utilize said battery equalizing circuit and shunt the electric current of the battery of said appointment.
The battery balanced method that is used between at least two battery modules of the present invention, said reference signal refer to the minimum value in the said minimum cell voltage that each said at least two battery module provides.
The present invention also provides a kind of battery equalization system that is used between balanced at least two battery modules; Said battery equalization system comprises: at least two battery modules; Each said battery module comprises battery management module and a plurality of equalizing circuit; Each battery management module is used for connecting monitoring the cell voltage of said a plurality of batteries with a plurality of batteries of corresponding battery module, and said a plurality of equalizing circuits are used for respectively connecting under the control of said battery management module, unbalanced battery is carried out balanced with a plurality of batteries of corresponding battery module; And controller; Be connected with each said battery module respectively; Be used to receive the minimum cell voltage that each said battery module provides, and more said minimum cell voltage to be to produce a reference signal, wherein the battery management module in each said battery module comprises battery balanced driver; The equalizing circuit that is used for starting corresponding battery module is carried out balanced to unbalanced battery according to said reference signal, obtain battery balanced between said at least two battery modules with this.
The battery equalization system that is used between balanced at least two battery modules of the present invention, said controller is connected with each said battery module respectively through communication bus.
The present invention can improve the efficient of battery system, and reduces power consumption.
Description of drawings
Fig. 1 is the structural representation that is used for battery balanced existing system;
Fig. 2 is the structural representation of battery equalization system according to an embodiment of the invention;
Fig. 3 is the structural representation of battery equalization system according to another embodiment of the present invention;
Fig. 4 is the flow chart of battery balanced method according to one embodiment of present invention.
Embodiment
Below, can further understand the object of the invention, specific structural features and advantage through some embodiments of the present invention being combined the description of its accompanying drawing.
The present invention's conjunction with figs. hereinafter describes comprehensively.The present invention possibly implement with some different modes, is restricted to certain concrete 26S Proteasome Structure and Function of introducing in the specification but should not be construed as the present invention.And should understand description that specification provides can be fully, the scope of passing on the present invention to contain to those skilled in the art fully.Based on the description of specification, those skilled in the art should recognize all embodiments of the present invention that scope of the present invention is intended to contain here and is disclosed, and independently implements or combines other embodiments of the present invention to implement.Such as, utilize the embodiment of any amount that proposes to realize a device or carry out a kind of method here.In addition, scope of the present invention also comprises a kind of like this device or method.This device or method can realize with other structure, function; Or utilize the embodiment that the present invention proposes to realize together here with other 26S Proteasome Structure and Functions, again or with the 26S Proteasome Structure and Function realization that is different from the embodiment that the present invention proposes here.Should be understood that all embodiments of the present invention of announcement can be implemented by the one or more elements in the claim here.
Fig. 2 is the structural representation of battery equalization system 200 according to an embodiment of the invention.In the embodiment of Fig. 2, battery equalization system 200 comprises battery module 282 and 284, and controller, such as central electronic control unit (central electriccontrol unit CECU) 280.According to different application, battery equalization system 200 can comprise any amount of battery module.In one embodiment, battery module 282 and 284 is to illustrate.
In one embodiment, battery module 282 comprises battery 202 and 204, battery equalizing circuit 222 and 224, battery voltage sampling circuit 232,234,236 and 238 and battery management module 262.In one embodiment, battery module 284 comprises battery 206 and 208, battery equalizing circuit 226 and 228, battery voltage sampling circuit 242,244,246 and 248 with battery management module 272.According to different application, battery module 282 and 284 can comprise any amount of battery.The similar of the structure of battery module 282 and battery module 284.
In one embodiment, battery management module 262 links to each other with 204 with battery 202, and comprises battery balanced driver 264 and single-chip microcomputer 266.Battery management module 262 can be to be used to manage protection, the monitoring integrated circuit such as the battery pack of lithium ion battery, Ni-MH battery.Battery management module 262 can be with the voltage of cyclic pattern through battery voltage sampling circuit 232,234,236 and 238 monitoring batteries 202 and 204.Battery management module 262 is periodically monitored the voltage of battery 202 and 204 with predetermined scanning frequency.In monitoring periods, voltage is measured one by one.In one embodiment; Battery management module 262 is except measuring the voltage of battery 202 and 204; The monitoring charge and discharge electric current that can also continue and the temperature of battery pack and battery unit; So that defencive function to be provided, include but not limited to the safeguard protection of overvoltage, under-voltage, overcurrent, short circuit, high temperature, low temperature.
Through the voltage of monitoring battery 202 and 204, battery management module 262 can obtain the information of cell voltage.Equally, battery management module 272 also can obtain the cell voltage of battery 206 and 208.In one embodiment, battery 202,204,206 and 208 cell voltage is sent to CECU 280 through communication bus 286.Communication bus 286 can be CAN, I
2Bus well known in the art such as C.Communication bus 286 can transmit different types of signal, such as voltage signal and control signal.CECU 280 compares and produces a reference signal with the cell voltage of receiving.In one embodiment, reference signal is a battery 202,204,206 and 208 minimum voltage value Vmin.Represent the reference signal of minimum voltage value Vmin to be fed back to battery management module 262 and 272 through communication bus 286.
In another embodiment, in order to reduce the load of communication bus 286, battery management module 262 (272) will represent that the signal of the minimum cell voltage of battery module 282 (284) sends to CECU 280 through communication bus 286.Single-chip microcomputer 266 compares and obtains the minimum cell voltage of battery module 282 to the magnitude of voltage of each battery in battery module 282 inside according to battery balanced algorithm.Battery balanced algorithm can be stored in the battery management module 262.Similarly, battery management module 272 also can compare and obtain the minimum cell voltage of battery module 284 in battery module 284 inside to the magnitude of voltage of each battery.Accordingly, the signal of pilot cell module 282 and 284 minimum cell voltage is sent out to CECU 280 through communication bus 286.In addition, when unusually or situation about not expecting when taking place, communication bus 286 can also be kept apart CECU 280 with battery module 282 and 284.The minimum cell voltage that 280 pairs of battery management module 262 of CECU and 272 are sent compares, and produces reference signal.In this case, this reference signal is a battery 202,204,206 and 208 minimum voltage value Vmin.
Single-chip microcomputer 276 in single-chip microcomputer 266 in the battery management module 262 and the battery management module 272 compares the voltage of each battery and minimum voltage Vmin to decide which battery is carried out equilibrium.In one embodiment, the battery balanced algorithm of single- chip microcomputer 266 or 276 execution can define preset threshold value Δ V.In another embodiment, preset threshold value Δ V can be provided with by the user.If the difference of the cell voltage of minimum voltage Vmin and certain battery exceeds preset threshold value Δ V, this battery will be performed battery balanced.
Such as, battery balanced if battery 202 is carried out by decision, battery balanced driver 264 will start the electric current shunting of battery equalizing circuit 222 with battery 202.Similarly, battery equalizing circuit 224 can be driven with the electric current shunting with battery 204 by battery balanced driver 264.Battery balanced driver 274 can drive battery equalizing circuit 226 and 228 respectively for battery 206 and 208.
In a word, in one embodiment, battery equalization system 200 can carry out equilibrium to battery based on same reference signal.Specifically, through comparing the cell voltage of battery modules different in the battery equalization system 200, CECU 280 can be battery balanced to carry out for each battery module generation reference voltage signal.Therefore, utilize same reference signal, can obtain the battery balanced of different battery intermodules.
Fig. 3 is the structural representation of battery equalization system 300 according to another embodiment of the present invention.
In one embodiment, battery equalization system 300 comprises battery module 382 and 384, and central electronic control unit (central electric control unit CECU) 380.In one embodiment, battery module 382 comprises battery 302 and 304, battery equalizing circuit 322 and 324, battery voltage sampling circuit 332,334,336 and 338, and battery management module 362.Battery module 384 comprises battery 306 and 308, battery equalizing circuit 326 and 328, battery voltage sampling circuit 342,344,346 and 348, and battery management module 372.Battery module 382 and battery module 384 similar.
In one embodiment, battery management module 362 links to each other with 304 with battery 302, and comprises battery balanced driver 364.Battery management module 362 can be protection, the monitoring integrated circuit that is used for administration battery pack.Battery management module 362 can be through the voltage of battery voltage sampling circuit 332,334,336 and 338 monitoring batteries 302 and 304.In one embodiment; Battery management module 362 is except measuring the voltage of battery 302 and 304; The monitoring charge and discharge electric current that can also continue and the temperature of battery pack and battery unit, so that different defencive functions to be provided, the safeguard protection of for example overvoltage, under-voltage, overcurrent, short circuit, high temperature, low temperature.
Through the voltage of monitoring battery 302 and 304, battery management module 362 can send to CECU 380 with the information of the cell voltage that obtains.Equally, battery management module 372 also can obtain the cell voltage of battery 306 and 308 and send to CECU 380.CECU380 links to each other with 372 with battery management module 362 through communication bus 386.Communication bus 386 can transmit different types of signal, such as voltage signal and control signal.In addition, when unusually or situation about not expecting when taking place, communication bus 386 can also be kept apart CECU380 and battery module 382 and 384.
Comprise that the CECU 380 of battery balanced algorithm obtains the cell voltage of battery 302,304,306 and 308 from battery management module 362 and 372.Utilize battery balanced algorithm, 380 pairs of batteries of CECU 302,304,306 and 308 cell voltage compare, and produce a reference signal.In one embodiment, reference signal refers to the minimum voltage Vmin of all batteries in battery module 382 and 384.CECU 380 further compares the cell voltage of minimum voltage Vmin and each battery 302,304,306 and 308 respectively.If the difference of the cell voltage of minimum voltage Vmin and certain battery exceeds preset threshold value Δ V, this battery will be performed battery balanced.In one embodiment, battery balanced algorithm can define preset threshold value Δ V.In another embodiment, preset threshold value Δ V can be provided with by the user.Such as, if the difference of the voltage of battery 302 and minimum voltage Vmin exceeds preset threshold value Δ V, CECU 380 produces a control signal and sends to battery management module 362 through communication bus 386.Be the control signal that response CECU 380 sends, the battery balanced driver 364 in the battery management module 362 drives the electric current shunting of battery equalizing circuit 322 with battery 302.
Fig. 4 is the flow chart 400 of battery balanced method according to one embodiment of present invention.Fig. 4 combines Fig. 2 to describe.
In step 402, the cell voltage of battery is monitored by battery management module.Such as, battery 202,204,206 in the battery module 282 and 284 and 208 cell voltage are monitored.For example battery management module 262 is passed through the cell voltage that battery voltage sampling circuit 232 and 234 is monitored batteries 202 again.Battery management module 262 is periodically measured the cell voltage of battery 202 and 204 with preset scanning frequency.
In step 404, the cell voltage in the battery module is compared generates a reference signal.Such as, the battery 202,204,206 in the battery module 282 and 284 and 208 cell voltage by relatively and produce reference signal.In one embodiment, reference signal refers to battery 202,204, the minimum voltage Vmin of 206 and 208 cell voltages.
In step 406, based on reference signal, decision will be performed battery balanced battery.Cell voltage such as, each battery 202,204,206 and 208 can be compared by battery balanced algorithm and reference signal.Battery balanced algorithm can define preset threshold value Δ V.The difference of the cell voltage of minimum voltage Vmin and certain battery exceeds preset threshold value Δ V, and this battery will be performed battery balanced.
In step 408, battery balanced meeting is performed in the battery of confirming in each battery module.Such as, battery balanced driver 264 or 274 can drive the corresponding battery equalizing circuit, and for example battery equalizing circuit 222,224, and 226 or 228 carry out equilibrium.Such as, battery balanced if battery 202 is carried out by decision, battery balanced driver 264 will start the electric current shunting of battery equalizing circuit 222 with battery 202.
Claims (14)
1. a battery equalization system is characterized in that, said battery equalization system comprises:
At least two battery modules; Each said battery module comprises a plurality of batteries; A plurality of equalizing circuits and battery management module corresponding to said a plurality of batteries; Said battery management module is connected the cell voltage that is used to obtain said a plurality of batteries with said a plurality of batteries, and said a plurality of equalizing circuits are connected with said a plurality of batteries respectively and are used under the control of said battery management module, unbalanced battery being carried out equilibrium; With
Controller is connected with each said battery module respectively, be used for receiving the minimum cell voltage that each said battery module provides respectively, and more said minimum cell voltage to be producing a reference signal,
Wherein the battery management module in each said battery module is controlled said a plurality of equalizing circuit and according to said reference signal unbalanced battery is carried out balancedly, obtains battery balanced between said at least two battery modules with this.
2. battery equalization system according to claim 1; It is characterized in that; Each said battery module further comprises the voltage sampling circuit that is connected between said a plurality of battery and the said battery management module, and said voltage sampling circuit is used to detect said cell voltage.
3. battery equalization system according to claim 1 is characterized in that, said reference signal refers to the minimum value in the said minimum cell voltage that said at least two battery modules provide.
4. battery equalization system according to claim 1 is characterized in that the battery management module of each said battery module comprises single-chip microcomputer, and the cell voltage that is used for more said each battery of battery module is to produce said minimum cell voltage.
5. battery equalization system according to claim 1; It is characterized in that; Said controller is sent to said battery management module with said reference signal, and said battery management module compares the voltage of each said battery and said reference signal to decide and is performed balanced battery.
6. battery equalization system according to claim 1 is characterized in that, said at least two battery modules receive said reference signal, and is performed the battery of said equilibrium based on said reference signal decision.
7. battery equalization system according to claim 1 is characterized in that, the difference of voltage and said reference signal that be performed the said battery of said equilibrium surpasses preset threshold value.
8. battery equalization system according to claim 1 is characterized in that, said controller is connected with each said battery module respectively through communication bus.
9. a battery balanced method that is used between at least two battery modules is characterized in that, said battery balanced method comprises:
Monitor the cell voltage of a plurality of batteries in each said battery module;
Receive the minimum cell voltage of each said battery module respectively, and more said minimum cell voltage is to produce a reference signal;
Based on said reference signal, in said at least two battery modules, specify to be performed balanced battery; With
Carry out said equilibrium for the battery of appointment, between said two battery modules, obtain battery balanced at least with this.
10. the battery balanced method that is used between at least two battery modules according to claim 9 is characterized in that, the step that said appointment is performed balanced battery comprises:
The voltage of the cell voltage of more said a plurality of batteries and said reference signal respectively; With
When the voltage difference that relatively obtains exceeded preset threshold value, decision was the battery of said appointment by battery relatively.
11. the battery balanced method that is used between at least two battery modules according to claim 9 is characterized in that, carries out equilibrium and comprises in the step of the battery of appointment:
Drive battery equalizing circuit based on said reference signal; With
Utilize said battery equalizing circuit to shunt the electric current of the battery of said appointment.
12. the battery balanced method that is used between at least two battery modules according to claim 9 is characterized in that, said reference signal refers to the minimum value in the said minimum cell voltage that said at least two battery modules provide.
13. a battery equalization system that is used between balanced at least two battery modules is characterized in that said battery equalization system comprises:
At least two battery modules,
Each said battery module comprises battery management module and a plurality of equalizing circuit; Each battery management module is used for connecting monitoring the cell voltage of said a plurality of batteries with a plurality of batteries of corresponding battery module, and said a plurality of equalizing circuits are used for respectively connecting under the control of said battery management module, unbalanced battery is carried out balanced with a plurality of batteries of corresponding battery module; And
Controller is connected with each said battery module respectively, be used to receive the minimum cell voltage that each said battery module provides, and more said minimum cell voltage to be producing a reference signal,
Wherein the battery management module in each said battery module comprises battery balanced driver; The equalizing circuit that is used for starting corresponding battery module is carried out balanced to unbalanced battery according to said reference signal, obtain battery balanced between said at least two battery modules with this.
14. the battery equalization system that is used between balanced at least two battery modules according to claim 13 is characterized in that,
Said controller is connected with each said battery module respectively through communication bus.
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Families Citing this family (9)
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| CN102412601A (en) * | 2010-09-25 | 2012-04-11 | 江苏海四达电源股份有限公司 | Protection control method of low-capacity high-power lithium battery pack |
| CN102064356B (en) * | 2010-12-21 | 2012-09-19 | 深圳市佳华利道新技术开发有限公司 | Battery management system |
| CN102653263B (en) * | 2011-03-03 | 2014-08-06 | 北汽福田汽车股份有限公司 | Electric automobile power battery management system and method |
| CN102111005A (en) * | 2011-03-08 | 2011-06-29 | 上海大学 | Equalization management system and method for nondestructive lithium battery |
| JP2013192394A (en) * | 2012-03-14 | 2013-09-26 | Ricoh Co Ltd | Charging control circuit and battery device |
| CN103280854B (en) * | 2013-05-23 | 2018-10-02 | 浙江吉利汽车研究院有限公司杭州分公司 | Automobile power cell charging system and charging method |
| CN106611984B (en) * | 2016-03-15 | 2020-12-11 | 深圳芯典半导体科技有限公司 | Battery management method and system |
| CN110015187B (en) * | 2017-08-31 | 2023-01-06 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic device |
| CN110015129B (en) * | 2017-08-31 | 2021-06-18 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic device |
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