CN205544439U - Battery management system with balanced function of initiative - Google Patents
Battery management system with balanced function of initiative Download PDFInfo
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- CN205544439U CN205544439U CN201620214514.1U CN201620214514U CN205544439U CN 205544439 U CN205544439 U CN 205544439U CN 201620214514 U CN201620214514 U CN 201620214514U CN 205544439 U CN205544439 U CN 205544439U
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The utility model discloses a to a battery management system with balanced function of initiative to specific battery management system who has the balanced function of this initiative that has explained. This system includes a low pressure MOSFET and is used for every section battery cell's attached drive circuit, a multi -winding transformer and a microcontroller (MCU) who is used for the group battery. Switching on and turn -offing of every MOSFET is controlled in microcontroller's (MCU) effect, detects battery voltage and carry out the equilibrium to the battery monomer that has different voltages in each group battery. Through the modularization, the system can realize any number's cell's equilibrium.
Description
Technical field
This utility model relates to a kind of battery management system, particularly relates to a kind of battery management system with active equalization function, the control management of the high-tension high-power series battery being mainly used in electric automobile.
Background technology
In recent years, hybrid power, plug-in hybrid and pure electric automobile have been realized in commercialization.High-tension high-power series winding set of cells plays important role in electric automobile, and energy is high and energy density becomes greatly optimum selection because it stores for lithium ion battery.But lithium ion battery also has weak point, especially can not overcharge, its safety in terms of crossing punching electricity, overdischarge and improper use is also the most concerned problems of people.When substantial amounts of lithium ion battery is contacted for high-power and high-octane application, it is necessary for being equipped with a battery management system with equalization function.In order to the battery unit making series connection is more healthy, safety, active volume and battery life are all improved, and need battery management system that battery is carried out voltage detecting and equilibrium.Detection and equilibrium are two piths in battery management system.
In prior art designs as patent US7939965B2 and US005659237A, testing circuit is directly connected with battery unit.For the set of cells of a series connection, the current potential in battery end may be the highest, and therefore testing circuit to bear the highest voltage.This may dramatically increase the cost of circuit.The patent of the numbered US6538414 of the U.S. proposes a kind of method, and testing circuit is connected to battery unit by multiwinding transformer, so that testing circuit and battery unit are isolated.Therefore low-power device can be used.With this simultaneously, transformator or a part for equalizing circuit.By this method, totle drilling cost can be lowered.But the quantity of Transformer Winding is the biggest in US6538414, and each MOSFET needs a transformator to drive.Too many winding and transformator add the cost of circuit.
Summary of the invention
Technical problem to be solved in the utility model is to provide a multiwinding transformer makes testing circuit and battery unit be isolated, and therefore can use low-power device.The more important thing is, present disclosure reduces the quantity of Transformer Winding and eliminate driving transformer, therefore decreasing a large amount of circuit cost.
In order to solve above technical problem, a kind of battery management system with active equalization function of this utility model, save the cell being serially connected including: N, these batteries are divided into M to battery unit pair, wherein N is an even number more than zero；
One multiwinding transformer with M winding, each winding in M winding has one end to be connected with the midpoint of battery unit pair, and M winding is connected with the midpoint of M battery unit pair respectively；
N number of low tension switch device, is associated with N number of battery unit, and N number of low tension switch device is also divided into M pair, each switch to midpoint be connected with the other end of M Transformer Winding, each switch is by the operation of selectivity；
Wherein, drive circuit controls the break-make of described low tension switch device, and wherein drive circuit optionally operates described low tension switch device, makes an energy joint from N batteries to an other joint transfer；
The multiwinding transformer of M winding also includes an additional winding, is realized the isolation measurement of battery cell voltage by this winding.
Preferably, also include a micro-control unit, the carrying out that voltage on described additional winding outputs signal to described micro-control unit controls by low pass filter and circuit for signal conditioning is sampled, and described microcontroller calculates battery dump energy based on sampled voltage and battery pack current；Described micro-control unit sends to drive signal and control described low tension switch device enable by drive circuit and is shifted to the battery that dump energy is low by the battery that dump energy is high.
Preferably, each low tension switch device correspondence coupling diode in parallel.
Preferably, described low tension switch device is transistor.
Preferably, the low tension switch device of corresponding every a pair, wherein first low tension switch device is P-channel metal-oxide-semiconductor field-effect transistor, and second low tension switch device is n channel metal oxide semiconductor field effect transistor.
Preferably, described drive circuit includes driving chip, described driving chip is TC4428, the reversely output OUTA of described driving chip electrically connects described P and links up mos field effect transistor, and the forward output OUTB end of described driving chip electrically connects described N and links up mos field effect transistor.
Preferably, isolation circuit it is provided with between described micro-control unit and described drive circuit.
Preferably, described isolation circuit is optical coupling isolation circuit；Or described isolation circuitous resistance, diode and electric capacity.
Preferably, described micro-control unit is according to driving signal generating circuit output drive signal, described driving signal generating circuit includes two multiplexers, described micro-control unit output pwm signal and address signal are to multiplexer, one of them multiplexer output drive signal is to odd number low tension switch device drive circuit, and another multiplexer output drive signal is to even number low tension switch device drive circuit.
A kind of modular battery system, wherein, including P Battery pack administrative unit, every Battery pack administrative unit is the battery management unit group with active equalization function of a multiwinding transformer composition, every Battery pack administrative unit is provided with a two-way DC/DC transducer, described DC/DC transducer energy exchange between different Battery pack administrative units, the input of described DC/DC transducer is connected to the both positive and negative polarity of corresponding Battery pack administrative unit, the outfan of described DC/DC transducer is connected on a common bus, micro-control unit sends and receives the information of each battery management unit group by common bus, control described DC/DC transducer to be shifted to the battery administrative unit groups that dump energy is low from the battery management unit group that dump energy is high by energy.
The system proposed is by a low-voltage switches (M1 ~ M2n) and multiwinding transformer T (T1 ~ Tn, a Tm) composition.Low-voltage switches (M1 ~ M2n) is used for each battery unit (B1 ~ B2n), and multiwinding transformer T (T1 ~ Tn, Tm) is used for each set of cells.Two adjacent cell share a winding (T1 ~ Tn), and winding Tm is used to detect cell voltage.The circuit proposed has two working stages, detection-phase and balance stage.At detection-phase, all of switch turns on the most in order, and the induced voltage on Tm can be sampled thus detect battery cell voltage.Measurement by battery cell voltage, and the statistics of other signals such as battery current and historical data, micro-control unit (MCU) can calculate the battery unit needing to be charged or discharge, and selects the path of energy transmission and determines that the time starts balancing procedure at certain.Then duplicate detection and balance stage.Due to transformator T number of windings quantitative limitation, a multiwinding transformer is difficult to meet the situation that number of batteries is more.It is therefore proposed that a kind of modularity theory, it can be easy to support any amount of battery unit.The system proposed uses a multiwinding transformer to make testing circuit and battery unit be isolated, and therefore can use low voltage power devices, reduces device cost.Compared with the prior art, when the quantity of battery unit is identical, this system uses less Transformer Winding and eliminates driving transformer, and circuit cost therefore can be greatly reduced.
Accompanying drawing explanation
The utility model is described in further detail with detailed description of the invention below in conjunction with the accompanying drawings:
Fig. 1 is the schematic diagram that this utility model has the embodiment 1 of the battery management system of active equalization function.
Fig. 2 is the driving signal for the detection operation of Fig. 1 system.
Fig. 3 is the driving signal for the operation of Fig. 1 system equalization.
Fig. 4 is the part physical circuit figure that this utility model has the embodiment 2 of the battery management system of active equalization function.
Fig. 5 is the replacement circuit of drive circuit in Fig. 4.
Fig. 6 is the part physical circuit figure that this utility model has the embodiment 3 of the battery management system of active equalization function.
Fig. 7 is the schematic diagram of the embodiment of a kind of modular battery system of this utility model.
Detailed description of the invention
Embodiment 1:
A kind of battery management system with active equalization function of this utility model, saves the cell being serially connected including: N, these batteries is divided into M to battery unit pair, and wherein N is an even number more than zero；One multiwinding transformer with M winding, each winding in M winding has one end to be connected with the midpoint of battery unit pair, and M winding is connected with the midpoint of M battery unit pair respectively；N number of low tension switch device, is associated with N number of battery unit, and N number of low tension switch device is also divided into M pair, each switch to midpoint be connected with the other end of M Transformer Winding, each switch is by the operation of selectivity；Wherein, drive circuit controls the break-make of described low tension switch device, and wherein drive circuit optionally operates described low tension switch device, makes an energy joint from N batteries to an other joint transfer；The multiwinding transformer of M winding also includes an additional winding, is realized the isolation measurement of battery cell voltage by this winding.Also include a micro-control unit, the carrying out that voltage on described additional winding outputs signal to described micro-control unit controls by low pass filter and circuit for signal conditioning is sampled, and described microcontroller calculates battery dump energy based on sampled voltage and battery pack current；Described micro-control unit sends to drive signal and control described low tension switch device enable by drive circuit and is shifted to the battery that dump energy is low by the battery that dump energy is high.
As it is shown in figure 1, in the present embodiment, B1 ~ B2n is the battery unit of series connection to circuit structure, T1 ~ Tn is the winding of a multiwinding transformer T, and with battery units in parallel, M1 ~ M2n is the switch with anti-paralleled diode, Tm is another winding of multiwinding transformer, is used for detecting voltage.Voltage on Tm is processed by low pass filter and circuit for signal conditioning.The analog-digital converter sampling that the signal processed is controlled by micro-control unit (MCU).MCU calculates battery dump energy (SOC) based on cell voltage and battery pack current.According to result of calculation, MCU can send and drive Signal-controlled switch to make energy be shifted to the battery that dump energy is low by the battery that dump energy is high.Each low tension switch device correspondence coupling diode in parallel.Physical circuit principle such as figure, this is no longer going to repeat them.
Fig. 2 show the driving signal for detection.All switches turn in order.When the switch is closed, the voltage in respective battery can act on a winding of transformator T.This voltage can couple with detection winding Tm.Sampling in the correct time as long as MCU controls A/D converter, in set of cells, the voltage of all cells can be measured.
Fig. 3 show energy and is transferred to the principle of another batteries from a batteries.Such as energy to pass to B4 from B1, first closes M1, and energy will flow out from B1 and be stored into transformator T.Disconnect M1 afterwards and close M4, be stored in the energy in transformator T and can be flowed in B4.Repeat this process the time determined and will shift more energy.
Embodiment 2:
The present embodiment is with the difference of above-described embodiment, and described low tension switch device is transistor.The low tension switch device of corresponding every a pair, wherein first low tension switch device is P-channel metal-oxide-semiconductor field-effect transistor, and second low tension switch device is n channel metal oxide semiconductor field effect transistor.Described drive circuit includes driving chip, described driving chip is TC4428, the reversely output OUTA of described driving chip electrically connects described P and links up mos field effect transistor, and the forward output OUTB end of described driving chip electrically connects described N and links up mos field effect transistor.
Shown in Fig. 4, this circuit does not include producing G1 to G2n.M1, M3 ... that M2n-1 selects is a P-channel metal-oxide-semiconductor field-effect transistor P-MOS.M2, M4 ... that M2n selects is a n channel metal oxide semiconductor field effect transistor N-MOS.Use TC4428A driving chip in the design, be reversely connected to P-MOS during output OUTA, during positive output OUTB, be connected to N-MOS.In order to ensure that circuit safety is isolated from the control signal of MCU by a photo-coupler.When there is no control signal, OUTA be high level OUTB be low level.This means what all of MOSFETS was off.When at G1, G2 ... when having input current on G2n, corresponding MOSFETS can be switched on.
Certainly, Fig. 5 is a replacement circuit of Fig. 4 drive circuit, instead of photo-coupler with resistance, diode and electric capacity and decreases cost.Although this design not isolation, but electric capacity can bear the voltage more than 1000V easily and ensure that safety.
Embodiment 3:
The present embodiment is with the difference of above-described embodiment, described micro-control unit is according to driving signal generating circuit output drive signal, described driving signal generating circuit includes two multiplexers, described micro-control unit output pwm signal and address signal are to multiplexer, one of them multiplexer output drive signal is to odd number low tension switch device drive circuit, and another multiplexer output drive signal is to even number low tension switch device drive circuit.If Fig. 6 is shown, this circuit is for producing the G1 to G2n in Fig. 1.MCU exports PWM1 and PWM2, and also OPADD indicates which switch should follow pwm signal.Pwm signal and address signal are sent to two multiplexers.One multiplexer (MUX1) is connected to odd-numbered switch drive circuit, and another multiplexer (MUX2) is connected to even-numbered switch drive circuit.PWM1 is connected to the enable pin of MUX2, and PWM2 is connected to the enable pin of MUX1.In this way it is possible to prevent two switches to be switched in the same time.
The embodiment of modular battery system:
A kind of modular battery system, wherein, including P Battery pack administrative unit, every Battery pack administrative unit is the battery management unit group with active equalization function of a multiwinding transformer composition, every Battery pack administrative unit is provided with a two-way DC/DC transducer, described DC/DC transducer energy exchange between different Battery pack administrative units, the input of described DC/DC transducer is connected to the both positive and negative polarity of corresponding Battery pack administrative unit, the outfan of described DC/DC transducer is connected on a common bus, micro-control unit sends and receives the information of each battery management unit group by common bus, control described DC/DC transducer to be shifted to the battery administrative unit groups that dump energy is low from the battery management unit group that dump energy is high by energy.
It is illustrated in figure 7 the schematic diagram of modular method.Battery unit is divided into group, and the structure often organized is all identical.A two-way DC/DC transducer is added in each group.This DC/DC transducer is for positive energy exchange between group and group.The input of DC/DC transducer is connected to set of cells +/-pole, and outfan is connected on a common bus, can positive energy exchange by all set of cells of this bus.MCU sends and receives battery information by CAN, controls DC/DC transducer and is shifted to the set of cells that dump energy is low from the set of cells that dump energy is high by energy.
The system proposed is by a low-voltage switches (M1 ~ M2n) and multiwinding transformer T (T1 ~ Tn, a Tm) composition.Low-voltage switches (M1 ~ M2n) is used for each battery unit (B1 ~ B2n), and multiwinding transformer T (T1 ~ Tn, Tm) is used for each set of cells.Two adjacent cell share a winding (T1 ~ Tn), and winding Tm is used to detect cell voltage.The circuit proposed has two working stages, detection-phase and balance stage.At detection-phase, all of switch turns on the most in order, and the induced voltage on Tm can be sampled thus detect battery cell voltage.Measurement by battery cell voltage, and the statistics of other signals such as battery current and historical data, micro-control unit (MCU) can calculate the battery unit needing to be charged or discharge, and selects the path of energy transmission and determines that the time starts balancing procedure at certain.Then duplicate detection and balance stage.Due to transformator T number of windings quantitative limitation, a multiwinding transformer is difficult to meet the situation that number of batteries is more.It is therefore proposed that a kind of modularity theory, it can be easy to support any amount of battery unit.The system proposed uses a multiwinding transformer to make testing circuit and battery unit be isolated, and therefore can use low voltage power devices, reduces device cost.Compared with the prior art, when the quantity of battery unit is identical, this system uses less Transformer Winding and eliminates driving transformer, and circuit cost therefore can be greatly reduced.
The description above provided is intended merely to reach the purpose of illustration and description, and it is not intended as limit and limits the disclosure.Single factor or certain specific features are generally not limiting upon specific embodiment, even if the most particularly showing, but are adaptable in applicable place, and can use in the embodiment selected.In many aspects it can also be changed equally.Such change should not be taken as deviating from mutually with the disclosure, and all such amendments are provided to make it be included in the scope of the present disclosure.
Claims (10)
1. there is a battery management system for active equalization function, including:
N saves the cell that is serially connected, these batteries is divided into M to battery unit pair, and wherein N is an even number more than zero；
One multiwinding transformer with M winding, each winding in M winding has one end to be connected with the midpoint of battery unit pair, and M winding is connected with the midpoint of M battery unit pair respectively；
N number of low tension switch device, is associated with N number of battery unit, and N number of low tension switch device is also divided into M pair, each switch to midpoint be connected with the other end of M Transformer Winding, each switch is by the operation of selectivity；
It is characterized in that, drive circuit controls the break-make of described low tension switch device, and wherein drive circuit optionally operates described low tension switch device, makes an energy joint from N batteries to an other joint transfer；
The multiwinding transformer of M winding also includes an additional winding, is realized the isolation measurement of battery cell voltage by this winding.
The battery management system with active equalization the most according to claim 1, it is characterized in that, also include a micro-control unit, the carrying out that voltage on described additional winding outputs signal to described micro-control unit controls by low pass filter and circuit for signal conditioning is sampled, and described microcontroller calculates battery dump energy based on sampled voltage and battery pack current；Described micro-control unit sends to drive signal and control described low tension switch device enable by drive circuit and is shifted to the battery that dump energy is low by the battery that dump energy is high.
The battery management system with active equalization the most according to claim 2, it is characterised in that each low tension switch device correspondence coupling diode in parallel.
The battery management system with active equalization the most according to claim 2, it is characterised in that described low tension switch device is transistor.
The battery management system with active equalization the most according to claim 4, it is characterized in that, the low tension switch device of corresponding every a pair, wherein first low tension switch device is P-channel metal-oxide-semiconductor field-effect transistor, and second low tension switch device is n channel metal oxide semiconductor field effect transistor.
The battery management system with active equalization the most according to claim 5, it is characterized in that, described drive circuit includes driving chip, described driving chip is TC4428, the reversely output OUTA of described driving chip electrically connects described P and links up mos field effect transistor, and the forward output OUTB end of described driving chip electrically connects described N and links up mos field effect transistor.
The battery management system with active equalization the most according to claim 2, it is characterised in that be provided with isolation circuit between described micro-control unit and described drive circuit.
The battery management system with active equalization the most according to claim 7, it is characterised in that described isolation circuit is optical coupling isolation circuit；Or described isolation circuitous resistance, diode and electric capacity.
The battery management system with active equalization the most according to claim 2, it is characterized in that, described micro-control unit is according to driving signal generating circuit output drive signal, described driving signal generating circuit includes two multiplexers, described micro-control unit output pwm signal and address signal are to multiplexer, one of them multiplexer output drive signal is to odd number low tension switch device drive circuit, and another multiplexer output drive signal is to even number low tension switch device drive circuit.
null10. a modular battery system，It is characterized in that，Including P Battery pack administrative unit，Every Battery pack administrative unit is the battery management unit group with active equalization function of a multiwinding transformer composition，Every Battery pack administrative unit is provided with a two-way DC/DC transducer，Described DC/DC transducer energy exchange between different Battery pack administrative units，The input of described DC/DC transducer is connected to the both positive and negative polarity of corresponding Battery pack administrative unit，The outfan of described DC/DC transducer is connected on a common bus，Micro-control unit sends and receives the information of each battery management unit group by common bus，Control described DC/DC transducer to be shifted to the battery administrative unit groups that dump energy is low from the battery management unit group that dump energy is high by energy.
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| CN201620214514.1U CN205544439U (en) | 2016-03-21 | 2016-03-21 | Battery management system with balanced function of initiative |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703434A (en) * | 2016-03-21 | 2016-06-22 | 南京金龙新能源汽车研究院有限公司 | Battery management system with active equalization function |
| CN106849282A (en) * | 2017-04-14 | 2017-06-13 | 成都隆航科技有限公司 | A kind of active equalization system of electrokinetic cell |
| CN107634276A (en) * | 2017-09-21 | 2018-01-26 | 安徽省力霸动力锂电池科技有限公司 | The active equalization module of lithium battery |
-
2016
- 2016-03-21 CN CN201620214514.1U patent/CN205544439U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105703434A (en) * | 2016-03-21 | 2016-06-22 | 南京金龙新能源汽车研究院有限公司 | Battery management system with active equalization function |
| CN106849282A (en) * | 2017-04-14 | 2017-06-13 | 成都隆航科技有限公司 | A kind of active equalization system of electrokinetic cell |
| CN107634276A (en) * | 2017-09-21 | 2018-01-26 | 安徽省力霸动力锂电池科技有限公司 | The active equalization module of lithium battery |
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