A kind of electricity of power battery-electricity mixed power supply systemTechnical field
The invention belongs to hybrid power supply technical fields, are related to a kind of electricity-electricity mixed power supply system of power battery.
Background technique
Energy shortage and environmental pollution are the two large problems that the world today faces, and countries in the world are increasingly paid attention in strategyEnergy security and environmental protection.Energy conservation and emission reduction, development includes the war such as new energy, new material, new-energy automobile for the Chinese governmentSlightly new industry is used as and adjusts economic structure, the important implementation path of Economic Development Mode Conversion.
Battery is the important component of new energy as energy storage and output medium.Instantly face in development processThe big problem of one faced is the limitation of battery technology.It is close to energy density, power that single battery is not met by most equipmentThe requirement of degree, safety, service life, cost etc..With technological progress, battery energy density can be stepped up, within several years,Battery durable ability will no longer be main problem, and safety, reliability, service life and cost problem will be highlighted more.It adoptsElectricity consumption-electricity mixed power supply system can reduce the requirement to single battery, realize high power density and high-energy density, can be fastFast responsive load variation, service life cycle is also relatively long, is conducive to product commercialization promotion and application, is the weight of new energyWant developing direction.
Currently, electricity-electric mixed power supply system composition mainly has a following form: battery or fuel cell+super capacitor+DCDC controller, battery or fuel cell+super capacitor+switching device.It is mentioned in battery or fuel cell for continuous operationWhile for stable energy, super capacitor provides the peak point current and voltage occurred in the short time.
In the prior art, for the electric mixed power supply system of electricity-there are structure and control complexity, energy conversion efficiency is relatively low,Higher cost.
Summary of the invention
It is an object of the invention to: a kind of electricity-electricity mixed power supply system of power battery is provided, it is mixed to solve electricity-electricityThe problem of conjunction power supply system is there are structure and controls complexity, and energy conversion efficiency is relatively low, higher cost.
The technical solution adopted by the invention is as follows:
A kind of electricity of power battery-electricity mixed power supply system, including high-energy type battery system, high power type battery systemSystem, unidirectional DC/DC controller, the input of the output positive and negative electrode and unidirectional DC/DC controller of the high-energy type battery systemPositive and negative electrode connection, the output positive and negative electrode of the unidirectional DC/DC controller are defeated with high power type battery system and load respectivelyEnter positive and negative electrode connection, the output positive and negative electrode of the high power type battery system and the input positive and negative electrode of load connect.
Further, the high-energy type battery system is provided with the first battery management system BMS, first cell tubeReason system BMS and unidirectional DC/DC controller are communicated to connect by CAN bus.
Further, the high-energy type battery system is ternary lithium battery, energy type ferric phosphate lithium cell or fuel electricityAny one in pond.
Further, the high-energy type battery system is energy type ferric phosphate lithium cell.
Further, the high power type battery system is provided with the second battery management system BMS, second cell tubeReason system BMS and the first battery management system BMS is communicated to connect by CAN bus.
Further, the high power type battery system is lithium titanate battery or power-type ferric phosphate lithium cell.
Further, the high power type battery system is lithium titanate battery.
Further, the unidirectional DC/DC controller includes controller, the first driver, the second driver, the first reverse phaseDevice, switching tube Q1, switching tube Q2, inductance L1, current divider Rs, resistance R1, resistance R2, the output of the high-energy type battery systemAnode is sequentially connected in series after switching tube Q1, inductance L1 and current divider Rs positive with the input of high power type battery system and load respectivelyConnection, the output negative pole of the high-energy type battery system connect with high power type battery system and the input cathode of load respectivelyConnect, the first signal output end of the controller connect the first driver with connect afterwards with the signal input part of switching tube Q1, instituteThe the first signal output end series connection for stating controller is sequentially connected in series signal after the first phase inverter and the second driver with switching tube Q2Input terminal connection, the input terminal of the switching tube Q2 connect with the output negative pole of high-energy type battery system, output end and switchThe connection of pipe Q1 output end, the both ends the current divider Rs are connect with the signal input part of controller respectively, the resistance R1 and resistanceAfter R2 series connection one end connect with the output end of current divider Rs, the connection of the output negative pole of the other end and high-energy type battery system.
It further, further include that at least shunt circuit, the shunt circuit include third driver, the 4th driving all the wayDevice, the second phase inverter, switching tube Q3, switching tube Q4, inductance L2, the output cathode of the high-energy type battery system are sequentially connected in seriesIt is connect respectively with high power type battery system and the input anode of load after switching tube Q3, inductance L2 and current divider Rs, the controlDevice processed second signal output end series connection third driver with connect afterwards with the signal input part of switching tube Q3, the controllerThe series connection of second signal output end is connect after being sequentially connected in series the second phase inverter and fourth drive with the signal input part of switching tube Q4,The input terminal of the switching tube Q4 is connect with the output negative pole of high-energy type battery system, output end and switching tube Q3 output end connectIt connects.
Further, the second signal input terminal of any point and controller connects between the resistance R1 and resistance R2.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are:
1. a kind of electricity of power battery-electricity mixed power supply system of the present invention, high-energy type battery system and high power type electricityCell system is powered to the load by the connection of unidirectional DC/DC controller, can be made up power supply system output power deficiency, be improved energyUtilization rate reduces the structure and control complexity of system, realizes highly reliable, the inexpensive purpose of the electric mixed power supply system of electricity-.
2. a kind of electricity of power battery-electricity mixed power supply system of the present invention, the first battery management system BMS are total by CANLine is communicated with unidirectional DC/DC controller, convenient for being carried out by the first battery management system BMS to unidirectional DC/DC controllerIt indirectly controls.
3. a kind of electricity of power battery-electricity mixed power supply system of the present invention, high-energy type battery system can use a variety ofBattery, convenient for being selected as needed, the scope of application is wider.
4. a kind of electricity of power battery-electricity mixed power supply system of the present invention, high-energy type battery system preferred energy type phosphorusSour lithium iron battery, stability with higher, convenient for guaranteeing the stability of entire mixed power supply system.
5. a kind of electricity of power battery-electricity mixed power supply system of the present invention, the second battery management system BMS are total by CANLine is communicated with the first battery management system BMS, intelligently adjusts high-energy type battery system convenient for the first battery management system BMSCharging and discharging currents, power of system etc..
6. a kind of electricity of power battery-electricity mixed power supply system of the present invention, high power type battery system can use a variety ofBattery, convenient for being selected as needed, the scope of application is wider.
7. a kind of electricity of power battery-electricity mixed power supply system of the present invention, the preferred lithium titanate electricity of high power type battery systemPond, when load operating mode transformation generates regenerative feedback energy, lithium titanate battery can fully absorb regenerative braking feedback energy,Energy utilization rate is high.
8. a kind of electricity of power battery-electricity mixed power supply system of the present invention, high-energy type battery system pass through unidirectional DC/DCController is to high power type battery system and load supplying, when unidirectional DC/DC controller output electric current is more than the maximum electricity of settingCurrent limited Control is carried out when flow valuve, inside controller to reach to limit the output electric current of high-energy type battery system to high-energy typeThe discharge prevention of battery system is run, and the temperature rise for influencing battery performance and safety is inhibited, and security of system and uses the longevityLife is ensured that, in addition, unidirectional DC/DC controller architecture is simple, low in energy consumption, cooling system is simple, high reliablity, economyIt is good.
9. a kind of electricity of power battery-electricity mixed power supply system of the present invention, is shunted by shunt circuit, using two-phaseCrisscross parallel form promotes circuit efficiency, efficiency is up to 98% left side to reduce the current stress of switching tube Q1, Q2, Q3, Q4It is right.
10. a kind of electricity of power battery-electricity mixed power supply system of the present invention can acquire and appoint between resistance R1 and resistance R2It anticipates any voltage signal, the data for obtaining voltage signal convenient for controller are analyzed.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attachedFigure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pairThe restriction of range for those of ordinary skill in the art without creative efforts, can also be according to thisA little attached drawings obtain other relevant attached drawings, in which:
Fig. 1 is a kind of structural schematic diagram of the electricity of power battery-electricity mixed power supply system of the present invention；
Fig. 2 is a kind of structural representation of the unidirectional DC/DC controller of the electricity of power battery-electricity mixed power supply system of the present inventionFigure.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, rightThe present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, notFor limiting the present invention, i.e., described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is logicalThe component for the embodiment of the present invention being often described and illustrated herein in the accompanying drawings can be arranged and be designed with a variety of different configurations.
Therefore, the detailed description of the embodiment of the present invention provided in the accompanying drawings is not intended to limit below claimedThe scope of the present invention, but be merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the artMember's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
It should be noted that the relational terms of term " first " and " second " or the like be used merely to an entity orOperation is distinguished with another entity or operation, and without necessarily requiring or implying between these entities or operation, there are anyThis actual relationship or sequence.Moreover, the terms "include", "comprise" or its any other variant be intended to it is non-exclusiveProperty include so that include a series of elements process, method, article or equipment not only include those elements, but alsoFurther include other elements that are not explicitly listed, or further include for this process, method, article or equipment it is intrinsicElement.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including describedThere is also other identical elements in the process, method, article or equipment of element.
Embodiment
As shown in Figure 1, a kind of electricity of power battery-electricity mixed power supply system of the present invention, including high-energy type battery system,High power type battery system, unidirectional DC/DC controller, the output positive and negative electrode and unidirectional DC/DC of the high-energy type battery systemThe input positive and negative electrode of controller connects, the output positive and negative electrode of the unidirectional DC/DC controller respectively with high power type battery systemIt unites and is connected with the input positive and negative electrode of load, the output positive and negative electrode of the high power type battery system and the input of load are positive and negativePole connection.
As shown in Figure 2, it is preferable that the high-energy type battery system is provided with the first battery management system BMS, and describedOne battery management system BMS and unidirectional DC/DC controller are communicated to connect by CAN bus.When implementation, the first battery management systemBMS is for obtaining the information such as state-of-charge SOC value, voltage, electric current and the temperature of high-energy type battery system, first batteryManagement system BMS is communicated by CAN bus with unidirectional DC/DC controller, convenient for passing through BMS pairs of the first battery management systemUnidirectional DC/DC controller is indirectly controlled.
In addition, the high-energy type battery system is in ternary lithium battery, energy type ferric phosphate lithium cell or fuel cellAny one.When implementation, high-energy type battery system can use multiple battery, convenient for being selected as needed, be applicable inRange is wider.
Preferably, the high-energy type battery system is energy type ferric phosphate lithium cell.When implementation, energy type LiFePO4Battery stability with higher, convenient for guaranteeing the stability of entire mixed power supply system.
As shown in Figure 2, it is preferable that the high power type battery system is provided with the second battery management system BMS, and describedTwo battery management system BMS and the first battery management system BMS are communicated to connect by CAN bus.When implementation, the second battery managementSystem BMS is for obtaining the information such as state-of-charge SOC value, voltage, electric current and the temperature of high power type battery system, the second batteryManagement system BMS is communicated by CAN bus with the first battery management system BMS, and the first battery management system BMS intelligence is convenient forIt is adjustable charging and discharging currents, the power etc. of high-energy type battery system.
In addition, the high power type battery system is lithium titanate battery or power-type ferric phosphate lithium cell.When implementation, high energyAmount type battery system can use multiple battery, and convenient for being selected as needed, the scope of application is wider.
Preferably, the high power type battery system is lithium titanate battery.When implementation, lithium titanate battery has cycle lifeThe advantages that length, high-low temperature resistant, safety and stability, fast charging and discharging, memory-less effect, self-discharge rate are low, environmentally protective.When load workWhen operation mode transformation generates regenerative feedback energy, lithium titanate battery can fully absorb regenerative braking feedback energy, using energy sourceRate is high.
As shown in Fig. 2, specifically, the unidirectional DC/DC controller include controller, the first driver, the second driver,First phase inverter, switching tube Q1, switching tube Q2, inductance L1, current divider Rs, resistance R1, resistance R2, high-energy type battery systemThe output cathode of system be sequentially connected in series after switching tube Q1, inductance L1 and current divider Rs respectively with high power type battery system and loadInput anode connection, the input with high power type battery system and load respectively of the output negative pole of the high-energy type battery systemCathode connection, the first signal output end of the controller connect the first driver with connect afterwards with the signal input part of switching tube Q1It connects, the first signal output end series connection of the controller is sequentially connected in series after the first phase inverter and the second driver with switching tube Q2'sSignal input part connection, the input terminal of the switching tube Q2 connect with the output negative pole of high-energy type battery system, output end andThe connection of switching tube Q1 output end, the both ends the current divider Rs connects with the signal input part of controller respectively, the resistance R1 withAfter resistance R2 series connection one end connect with the output end of current divider Rs, the output negative pole of the other end and high-energy type battery system companyIt connects.When implementation, high-energy type battery system by unidirectional DC/DC controller to high power type battery system and load supplying, whenWhen unidirectional DC/DC controller output electric current is more than the maximum current value of setting, Current limited Control is carried out inside controller, to limit heightThe output electric current of energy-type cells system reaches the discharge prevention operation to high-energy type battery system, influences high-energy type electricityThe temperature rise of cell system performance and safety is inhibited, and security of system and service life are ensured.In addition, unidirectional DC/DCController architecture is simple, low in energy consumption, and cooling system is simple, high reliablity, good economy performance.
As shown in Figure 2, wherein further include that at least shunt circuit, the shunt circuit include third driver, the 4th all the wayDriver, the second phase inverter, switching tube Q3, switching tube Q4, inductance L2, the output cathode of the high-energy type battery system is successivelyIt is connect respectively with high power type battery system and the input anode of load after tandem tap pipe Q3, inductance L2 and current divider Rs, instituteState controller second signal output end series connection third driver with connect afterwards with the signal input part of switching tube Q3, the controlThe second signal output end series connection of device is sequentially connected in series the signal input part after the second phase inverter and fourth drive with switching tube Q4Connection, the input terminal of the switching tube Q4 is connect with the output negative pole of high-energy type battery system, output end and switching tube Q3 are defeatedOutlet connection.When implementation, shunted by shunt circuit, using two-phase crisscross parallel form, with reduce switching tube Q1, Q2,The current stress of Q3, Q4 promote circuit efficiency, and efficiency is up to 98% or so.
As shown in Figure 2, it is preferable that the second signal of any point and controller inputs between the resistance R1 and resistance R2End connection.When implementation, the voltage signal at any point between resistance R1 and resistance R2 can be acquired, obtains voltage convenient for controllerThe data of signal are analyzed.
The operation principle of the present invention is that: unidirectional DC/DC controller input voltage grade and high-energy type cell system voltageGrade matches, and output voltage grade matches with high power type battery system and load voltage grade.High-energy type battery systemSystem is by unidirectional DC/DC controller to high power type battery system and load supplying, high power type battery system powering load.
In use, unidirectional DC/DC controller output electric current is more than the maximum current value of setting, in unidirectional DC/DC controllerPortion carries out Current limited Control and reaches the electric discharge to high-energy type battery system to limit the output electric current of high-energy type battery systemProtection operation.Specifically, the differential voltage signal that the first signal input part of controller acquires the both ends current divider Rs in real time is gone forward side by sideRow processing, when unidirectional DC/DC controller output electric current is more than the maximum current value of control setting, controller exports one firstPwm control signal.At this point, the turn-on time that the first driver receives high level signal driving switch pipe Q1 reduces, meanwhile, theTwo drivers are increased by the turn-on time that phase inverter receives low level signal driving switch pipe Q2, therefore, unidirectional DC/DC controlDevice output electric current processed clamps down on the maximum current value in setting.
In use, load current is less than the output current limit value of unidirectional DC/DC controller setting, high-energy type battery systemSystem is powered to the load by unidirectional DC/DC controller, and is charged to high power type battery system.Load current is greater than unidirectional DC/The output current limit value of DC controller setting, unidirectional DC/DC controller will export electric current and clamp down in setting value, high-energy type electricityCell system powers to the load with high power type battery system simultaneously.It is insufficient that power supply system output power can be made up, improve energyUtilization rate reduces the structure and control complexity of system, realizes highly reliable, the inexpensive purpose of the electric mixed power supply system of electricity-.
Wherein, when this system is applied on fork truck, high-energy type battery system can select power echelon battery to be moved(so-called power battery echelon utilizes the utilization of power battery echelon, refers to during Development of EV, to power battery Life CycleAfter phase and reusability are estimated, battery system is removed from vehicle for monomer one by one, and recombinate " re-employment ",The battery energy storage system new as one), the discharge prevention fortune to power echelon battery is reached by unidirectional DC/DC controllerRow, for normally supporting fork truck power supply.Convenient for the reasonable secondary use of echelon battery, a large amount of resource is saved.
In addition, can be arranged according to the flexible in size of output electric current when unidirectional DC/DC controller needs to export larger currentAt least shunt circuit is answered using two-phase (or multiphase) crisscross parallel form with reducing the electric current of switching tube Q1, Q2, Q3, Q4 all the wayPower promotes circuit efficiency, and efficiency is up to 98% or so.The inductance of single inductance is reduced by inductance L1 and inductance L2 parallel connectionIt is required that needing to meet the production difficulty that certain inductance occurs using single inductance to evade.
The foregoing is merely illustrative of the preferred embodiments of the present invention, the protection scope being not intended to limit the invention, anyThose skilled in the art within the spirit and principles in the present invention made by any modifications, equivalent replacements, and improvements etc.,It should all be included in the protection scope of the present invention.