CN102650894B - A kind of voltage collection circuit for battery management system - Google Patents
A kind of voltage collection circuit for battery management system Download PDFInfo
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- CN102650894B CN102650894B CN201210121362.7A CN201210121362A CN102650894B CN 102650894 B CN102650894 B CN 102650894B CN 201210121362 A CN201210121362 A CN 201210121362A CN 102650894 B CN102650894 B CN 102650894B
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Abstract
The present invention proposes a kind of voltage collection circuit for battery management system, comprise n collecting unit and controller, collecting unit comprises battery Ci, gauge tap Qi1 and circuit switching Qi2, the battery Ci of each adjacent collecting unit passes through positive pole, negative pole is connected successively, the negative pole of V1 connects public terminal GND, the positive pole of battery Ci passes through one end of resistance Ri1 contact resistance R0, the other end of resistance R0 connects public terminal GND, battery Ci, series loop switch Qi2 in the loop of resistance Ri1 and resistance R0, Parallel Control switch Qi1 between the control end of circuit switching Qi2 and public terminal, gauge tap Qi1 control end connection control device output terminal KZi, one end of input end contact resistance R0 and the Ri1 connection of controller.This voltage collection circuit is by arranging gauge tap Qi1 and circuit switching Qi2, and reduce voltage collection circuit power consumption, each batteries velocity of discharge is basically identical.
Description
Technical field
The present invention relates to battery management system field, refer to a kind of voltage collection circuit for voltage control system especially.
Background technology
Lithium battery is high with its energy density, high temperature performance good, have extended cycle life, the feature such as pollution-free, more and more be applied to various industry and field, because the voltage of the single battery of lithium battery only has 2.8V ~ 4.2V, obtain the battery of more high voltage and capacity, must by multiple batteries serial or parallel connection composition electric battery.Therefore, for preventing each batteries overcharge or overdischarge in electric battery, make the voltage of each single battery maintain zone of reasonableness, thus extend the serviceable life of electric battery, and understand the duty of electric battery at any time, be necessary for electric battery and configure a set of battery management system (BMS).
Fig. 1 is existing a kind of BMS, resistance pond is composed in series by 8 batteries C1 ~ C8, the positive pole of every batteries meets divider resistance Ri1 and Ri2 between terminal GND together, the voltage of divider resistance Ri2 is the sampled voltage of every batteries, 8 road sampled voltage signals all deliver to the electronic door circuit that 8 select 1, single-chip microcomputer selects the 1st road to carry out A/D conversion to the 8th road sampled voltage signal successively, obtain Section 1,1st ~ 2 joints respectively to magnitude of voltage V1, V2 to the V8 of 1st ~ 8 batteries, respectively subtract each other successively and just can obtain every batteries magnitude of voltage separately.
But each dividing potential drop sample resistance Ri1 and Ri2 of the voltage collection circuit in the battery management system shown in Fig. 1 cannot disconnect, each batteries moment of electric battery is discharged by divider resistance Ri1 and Ri2, add the power consumption of electric battery, consume energy, even if electric battery is also like this in power shortage situation, be not easy to long-time transport and store, electric battery usually must boost charge in 3 ~ May.
In addition, as shown in Figure 1:
The electric current of divider resistance R1.1, R1.2 of Section 1 battery C1 is: I1=V1/ (R1.1+R1.2);
The electric current of divider resistance R2.1, R2.2 of Section 2 battery C2 is: I2=V2/ (R2.1+R2.2);
………………………
The electric current of divider resistance R8.1, R8.2 of Section 8 battery C8 is: I8=V8/ (R8.1+R8.2).
So the electric current that every batteries respectively flows through is:
The electric current that Section 1 battery C1 flows through: IC1=I1+I2+I3+I4+I5+I6+I7+I8;
The electric current that Section 2 battery C2 flows through: IC2=I2+I3+I4+I5+I6+I7+I8;
The electric current that Section 3 battery C3 flows through: IC3=I3+I4+I5+I6+I7+I8;
The electric current that Section 4 battery C4 flows through: IC4=I4+I5+I6+I7+I8;
The electric current that Section 5 battery C5 flows through: IC5=I5+I6+I7+I8;
The electric current that Section 6 battery C6 flows through: IC6=I6+I7+I8;
The electric current that Section 7 battery C7 flows through: IC7=I7+I8;
The electric current that Section 8 battery C8 flows through: IC8=I8.
From upper surface analysis, the voltage collection circuit in Fig. 1 makes the discharge current of every batteries different, and namely the velocity of discharge of each batteries is inconsistent, causes the Voltage unbalance between each batteries in electric battery, and more obvious along with the prolongation of time.
Summary of the invention
The present invention proposes a kind of voltage collection circuit for battery management system, reduces the power consumption of voltage collection circuit, and the velocity of discharge of each batteries of electric battery is basically identical.
The technical scheme that the present invention adopts for its technical matters of solution is: provide a kind of voltage collection circuit for battery management system, comprise n collecting unit and controller, described collecting unit comprises battery Ci, gauge tap Qi1 and circuit switching Qi2, the battery Ci of each adjacent collecting unit passes through positive pole, negative pole is connected successively, and the negative pole of V1 connects public terminal GND, the positive pole of described battery Ci passes through one end of resistance Ri1 contact resistance R0, the other end of resistance R0 connects public terminal GND, described battery Ci, series loop switch Qi2 is gone back in the loop of resistance Ri1 and resistance R0, Parallel Control switch Qi1 between the control end of this circuit switching Qi2 and public terminal, the output terminal KZi of the control end connection control device of described gauge tap Qi1, one end of input end contact resistance R0 and the Ri1 connection of this controller,
Wherein, n be more than or equal to 1 positive integer, i is the positive integer being less than or equal to n.
The above-mentioned voltage collection circuit for battery management system, wherein, described gauge tap Qi1 is NPN triode, and described circuit switching Qi2 is PNP triode, and the control end of described gauge tap Qi1, circuit switching Qi2 is base stage.
The above-mentioned voltage collection circuit for battery management system, wherein, goes back resistance in series Ri2 between the control end of described circuit switching Qi2 and gauge tap Qi1.
The above-mentioned voltage collection circuit for battery management system, wherein, the resistance of described resistance Ri2 is directly proportional to the magnitude of voltage Vi between battery Ci to public terminal GND.
The above-mentioned voltage collection circuit for battery management system, wherein, goes back resistance in series Ri3 between the control end of described gauge tap Qi1 and the output terminal KZi of controller.
The above-mentioned voltage collection circuit for battery management system, wherein, the resistance of described resistance Ri3 is directly proportional to the amplitude of the output level of the output terminal KZi of controller.
The above-mentioned voltage collection circuit for battery management system, wherein, the microcontroller of described controller to be model be MSP430F149IPM.
Compared with prior art, the present invention has following beneficial effect: voltage collection circuit provided by the invention by arranging gauge tap Qi1 and circuit switching Qi2 in voltage acquisition unit, synchronization only has on resistance Ri1 and resistance R0 and has power consumption, reduce the power consumption of voltage collection circuit, and electric battery is when transport for long-distance or storage etc. shelves state, controller makes circuit switching Qi2 be in off-state, thus make voltage collection circuit there is no power consumption, facilitate long-distance transport and the storage of electric battery, and the velocity of discharge of each batteries Ci of electric battery is basically identical, the electric voltage equalization of each batteries Ci.In addition, voltage sampling circuit of the present invention, does not need electronic door circuit, has saved cost.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the electrical block diagram of existing voltage collection circuit;
Fig. 2 is the structural representation of a kind of voltage collection circuit for battery management system of the present invention;
In upper figure:
101 ~ 10n battery collecting unit 200 controller
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Fig. 2 is the structural representation of a kind of voltage collection circuit for battery management system of the present invention, as shown in Figure 2, voltage collection circuit for battery management system provided by the invention, comprise n collecting unit 101 ~ 10n and controller 200, described collecting unit 10i comprises battery Ci, gauge tap Qi1 and circuit switching Qi2, voltage between described electrical measurement Ci and public terminal GND is Vi, the battery Ci of each adjacent collecting unit 10i passes through positive pole, negative pole is connected successively, and the negative pole of V1 connects public terminal GND, the positive pole of described battery Ci passes through one end of resistance Ri1 contact resistance R0, the other end of resistance R0 connects public terminal GND, described battery Ci, series loop switch Qi2 is gone back in the loop of resistance Ri1 and resistance R0, Parallel Control switch Qi1 between the control end of this circuit switching Qi2 and public terminal, the output terminal KZi of the control end connection control device 200 of described gauge tap Qi1, one end of input end A/D contact resistance R0 and the Ri1 connection of this controller 200, wherein, n be more than or equal to 1 positive integer, i is the positive integer being less than or equal to n.And and go back resistance in series Ri3 between the control end of resistance in series Ri2, described gauge tap Qi1 and the output terminal KZi of controller 200 between the control end of described circuit switching Qi2 and gauge tap Qi1.
As shown in Figure 2, when needing the voltage detecting battery Ci, the output terminal KZi of controller 200 exports high level to the control end of gauge tap Qi1, the control end of circuit switching Qi2 is made to obtain a low level after gauge tap Qi1 conducting, thus circuit switching Qi2 conducting, voltage Vi between battery Ci and public terminal GND is loaded on resistance Ri1 and R0, voltage on resistance R0 is the voltage acquisition signal of battery Ci, and be input to the input end A/D of controller, after controller 200 internal conversion becomes the actual voltage value of battery Ci, controller 200 makes output terminal KZi become low level from high level, now gauge tap Qi1 disconnects, thus circuit switching Qi2 is disconnected, the voltage acquisition successively of battery Ci terminates.Therefore, as long as controller 200 makes circuit switching Qi2 conducting successively, and gather, voltage acquisition signal on transfer resistance R0, just can obtain the magnitude of voltage of each batteries Ci and the duty of electric battery respectively.During owing to gathering the voltage on R0 at every turn, only have circuit switching Qi2 conducting, therefore at one time in, the electric current I i that the Ri1 of battery Acquisition Circuit and resistance R0 flows through is: Ii=Vi/ (Ri1+R0)
Therefore, the power consumption of battery Acquisition Circuit of the present invention is little, and electric battery is when transport for long-distance or storage etc. shelves state, and controller 200 control loop switch Qi2 is in off-state, make voltage collection circuit there is no power consumption, facilitate long-distance transport and the storage of electric battery.
Preferably, described gauge tap Qi1 is NPN triode, and described circuit switching Qi2 is PNP triode, and the control end of described gauge tap Qi1, circuit switching Qi2 is base stage.
Preferably, the resistance of described resistance Ri3 is directly proportional to the amplitude of the output level of the output terminal KZi of controller, prevents the base current of gauge tap Qi1 excessive, causes gauge tap Qi1 to damage.
Preferably, the resistance of described resistance Ri2 is directly proportional to the magnitude of voltage Vi between battery Ci to public terminal GND, prevent circuit switching Qi2 from occurring being in unsaturation conducting state, affect voltage acquisition precision, or the base current of the control end of circuit switching Qi2 is excessive, cause damaging or increasing unnecessary power consumption.
Preferably, described controller 200 for model be the microcontroller of MSP430F149IPM, the output terminal KZi of described controller 200 is P4.0 ~ P4.7, the amplitude of the high level of the output terminal KZi output of this controller is 3V, the resistance of described resistance Ri3 is 3K Ω, and the input end A/D of described controller is P6.0.
In sum, voltage collection circuit provided by the invention by arranging gauge tap Qi1 and circuit switching Qi2 in voltage acquisition unit 10i, synchronization only has on resistance Ri1 and resistance R0 and has power consumption, reduce the power consumption of voltage collection circuit, and electric battery is when transport for long-distance or storage etc. shelves state, controller 200 control loop switch Qi2 is in off-state, voltage collection circuit is made not have power consumption, facilitate long-distance transport and the storage of electric battery, and the velocity of discharge of each batteries Ci of electric battery is basically identical, the electric voltage equalization of each batteries Ci.In addition, voltage sampling circuit of the present invention, does not need electronic door circuit, has saved cost.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. the voltage collection circuit for battery management system, comprise n collecting unit and controller, it is characterized in that: described collecting unit comprises battery Ci, gauge tap Qi1 and circuit switching Qi2, the battery Ci of each adjacent collecting unit passes through positive pole, negative pole is connected successively, and the negative pole of battery Ci connects public terminal GND, the positive pole of described battery Ci passes through one end of resistance Ri1 contact resistance R0, the other end of resistance R0 connects public terminal GND, described battery Ci, series loop switch Qi2 is gone back in the loop of resistance Ri1 and resistance R0, Parallel Control switch Qi1 between the control end of this circuit switching Qi2 and public terminal, the output terminal KZi of the control end connection control device of described gauge tap Qi1, one end of input end contact resistance R0 and the Ri1 connection of this controller, the microcontroller of described controller to be model be MSP430F149IPM,
Wherein, n be more than or equal to 1 positive integer, i is the positive integer being less than or equal to n.
2. the voltage collection circuit for battery management system according to claim 1, it is characterized in that: described gauge tap Qi1 is NPN triode, described circuit switching Qi2 is PNP triode, and the control end of described gauge tap Qi1, circuit switching Qi2 is base stage.
3. the voltage collection circuit for battery management system according to claim 2, is characterized in that: go back resistance in series Ri2 between the control end of described circuit switching Qi2 and gauge tap Qi1.
4. the voltage collection circuit for battery management system according to claim 3, is characterized in that: the resistance of described resistance Ri2 is directly proportional to the magnitude of voltage Vi between battery Ci to public terminal GND.
5. the voltage collection circuit for battery management system according to claim 2, is characterized in that: go back resistance in series Ri3 between the control end of described gauge tap Qi1 and the output terminal KZi of controller.
6. the voltage collection circuit for battery management system according to claim 5, is characterized in that: the resistance of described resistance Ri3 is directly proportional to the amplitude of the output level of the output terminal KZi of controller.
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| CN201210121362.7A CN102650894B (en) | 2012-04-24 | 2012-04-24 | A kind of voltage collection circuit for battery management system |
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| CN102650894B true CN102650894B (en) | 2016-01-20 |
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| CN101211192A (en) * | 2006-12-31 | 2008-07-02 | 立锜科技股份有限公司 | Simulated optical energy circuit |
| CN201035435Y (en) * | 2007-01-19 | 2008-03-12 | 河海大学常州校区 | Power supply voltage controller |
| CN101442252A (en) * | 2008-12-31 | 2009-05-27 | 焦作市明株自动化工程有限责任公司 | DC bus-bar voltage collection circuit for frequency changer |
| CN201341097Y (en) * | 2008-12-31 | 2009-11-04 | 焦作市明株自动化工程有限责任公司 | Direct current bus-bar voltage collection circuit used on frequency converter |
| JP2012049040A (en) * | 2010-08-27 | 2012-03-08 | Gs Yuasa Corp | Charge controller and power storage device |
| CN201897613U (en) * | 2010-12-03 | 2011-07-13 | 上海欣丰电子有限公司 | Alternating-current voltage acquisition circuit for mains supply |
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Denomination of invention: A voltage acquisition circuit for battery management system Effective date of registration: 20210514 Granted publication date: 20160120 Pledgee: Zhejiang Tailong Commercial Bank Co.,Ltd. Hangzhou Lin'an sub branch Pledgor: HANGZHOU LIN'AN BEYONDER POWER Co.,Ltd. Registration number: Y2021330000405 |