Summary of the invention
It is an object of the invention to: in the prior art without dual battery system, just there is no double cell cycle-index naturally alsoControl leads to be difficult to the technical issues of more preferably realizing double cell control, and the invention discloses a kind of dual battery system double cells to followRing time digital control method and system, dynamic adjust double cell frequency of use, two battery system performance of active equalization.
The technical solution adopted by the present invention is that such:
The invention discloses a kind of dual battery system double cell cycle-index control methods, specifically include step belowIt is rapid: Step 1: battery management system records battery charge and discharge data, wherein lotus when record data include each charge and dischargeThe variation range and number of electricity condition SOC；Step 2: conversion calculating is carried out to SOC=0% to SOC=100% by logical program,Obtain actual circulating battery number；Step 3: comparing two when monitoring device gets needs and charges or need to powerThe few preferential charge or discharge of battery of number is recycled in the recycling number of battery, selection.
Further, the above method further includes Step 4: battery management system while detection and calculating battery cellHealth degree SOH adjusts the threshold values of cycle-index by different SOH values.
Further, the above method further include: when the SOH value of two battery packs differs by more than 20%, two battery systemsThe cycle-index threshold values of system starts to change, and sets out two different circulations according to two variables of two SOH values and its differenceNumber, the biggish battery system cycle-index value of SOH value are also larger.
Further, the above method further includes when two battery systems decay to the 85% of rated capacity, and circulation is secondary at this timeNumber threshold values is drawn close toward centre again, and differs number no more than 3 times.
Further, the above method further includes judging that charge mode is fast charge or trickle charge, combined charge mode and twoThe corresponding battery of recycling selection of times of a battery.
Further, the above method further includes the electricity for judging two batteries, in conjunction with the electricity of two batteries and twoThe corresponding battery of recycling selection of times of battery.
Further, the above method further includes following in conjunction with the electricity of two batteries, charge mode and with two batteriesRing access times select corresponding battery.
The invention also discloses a kind of dual battery system double cell cycle-index control systems, specifically include battery managementSystem, detection device, compares and selecting unit logic computing unit；The battery management system is used for battery charge and discharge dataIt is recorded, wherein the variation range and number of state-of-charge SOC when record data include each charge and discharge；The logic meterIt calculates unit to be used to carry out conversion calculating to SOC=0% to SOC=100% by logical program, obtains actual circulating battery number；Whether the detection device needs to charge or needs to power for getting；The comparison and selecting unit are for comparing twoThe few preferential charge or discharge of battery of number is recycled in the recycling number of battery, selection.
In conclusion by adopting the above-described technical solution, the beneficial effects of the present invention are: the present invention solves double cellThe technological difficulties of system discharge breach the blind area that dual battery system uses on electric car, make to use on electric carDual battery system is possibly realized.The control of number is recycled to dual battery system during the charging process, protects two battery systemsIt holds in certain recycling number difference range, so that two battery performances is kept close, to improve entire battery systemPerformance.When during the charging process to the control that number is recycled, different control strategies is taken to fast charge and trickle charge mode, is led toIt crosses cycle-index and state-of-charge codetermines rechargeable battery, and then whole service life and the carrying capacity for improving battery, so that electronicAutomobile can run farther distance.
Specific embodiment
Combined with specific embodiments below, the present invention is described in detail.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present inventionIt is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not used toLimit the present invention.
The invention discloses a kind of dual battery system double cell cycle-index control methods, specifically include step belowIt is rapid: Step 1: each battery charge or discharge is primary using the recycling number of two batteries of counter real-time monitoring,Its corresponding counter adds 1；Step 2: comparing two batteries when monitoring device gets needs and charges or need to powerRecycling number, the few preferential charge or discharge of battery of number is recycled in selection.In the process of charge or dischargeIn to dual battery system be recycled number control, so that two battery systems is maintained at certain recycling number difference rangeIt is interior, so that two battery performances is kept close, to improve the performance of entire battery system.
A kind of dual battery system double cell cycle-index control method, specifically includes following step: Step 1: batteryManagement system BMS(Battery Manage System) battery charging and discharging is recorded, wherein record data include eachSOC(State of Charge when charge and discharge) value variation range and number；Step 2: by logical program to SOC=0% toSOC=100% carries out conversion calculating, obtains actual circulating battery number.Step 3: when monitoring device get needs charge orWhen person needs to power, compare the recycling number of two batteries, selection be recycled the few battery of number preferentially charge orElectric discharge.Step 4: battery management system (BMS) detects and calculates simultaneously the health degree SOH(State of of battery cellHealth), the threshold values of cycle-index is adjusted by different SOH values.When the SOH value of two battery packs differs by more than 20%, twoThe cycle-index threshold values of a battery system starts to change, and sets out two not according to two variables of two SOH values and its differenceSame cycle-index, the biggish battery system cycle-index value of SOH value are also larger.Step 5: but two battery systems decay to volumeConstant volume 85% when, recycle time number threshold values at this time and drawn close again toward centre, and differ number no more than 3 times.
Further, the above method further includes judging that charge mode is fast charge or trickle charge, combined charge mode and twoThe corresponding battery of recycling selection of times of a battery.
Further, the above method further includes the electricity for judging two batteries, in conjunction with the electricity of two batteries and twoThe corresponding battery of recycling selection of times of battery.
Further, the above method further includes following in conjunction with the electricity of two batteries, charge mode and with two batteriesRing access times select corresponding battery.
The invention also discloses a kind of dual battery system double cell cycle-index control systems, specifically include two batteriesRecycling number monitoring unit and battery selecting unit；The recycling number monitoring unit of described two batteries is for adoptingWith the recycling number of two batteries of counter real-time monitoring, each battery charge or discharge is primary, corresponding countingDevice adds 1；The battery selecting unit is used to compare two batteries when monitoring device gets needs and charges or need to powerRecycling number, the few preferential charge or discharge of battery of number is recycled in selection.In the process of charge or dischargeIn to dual battery system be recycled number control, so that two battery systems is maintained at certain recycling number difference rangeIt is interior, so that two battery performances is kept close, to improve the performance of entire battery system.
Fig. 1 is the control strategy when judging that this charging modes is fast charge.
As shown in Fig. 2, making two sets of battery system cycle-indexes when judging control strategy of this charging modes for trickle charge whenIt is maintained in certain value range.
Step 2 can be with specifically:
Step S202. judges charge mode, when for fast charge, continues step S203, otherwise enters step S204；
Step S203. compares the power that receives of two sets of battery systems, and selection receives the high battery system of power and preferentially charges；
Step S204. compares the recycling number of two sets of battery systems, and the few battery system of number is recycled in selectionPreferential charging；
Step S205. compares the state-of-charge of two sets of battery systems, and the battery system for selecting state-of-charge low preferentially charges.
The flow chart of dual battery system discharge control method of the invention as shown in Figure 3.It is all charged in two batteriesAfterwards, the use of two sets of battery systems is also related to.
The invention discloses a kind of dual battery system discharge control methods, specifically include following step: when powering on, prisonAfter surveying the electricity in two sets of battery systems and comparison, select the more batteries of electricity as currently used battery.When powering on,It selects the more batteries of electricity as currently used battery, the battery power consumption more than the electricity of use process Central Plains such as occurs and arriveBelow another piece of battery capacity.Power on next time it is previous as without automatically switch.When ambient temperature temperature is too low,Two sets of batteries need to retain 5% electricity, when the electricity of battery reaches the use threshold value of 5% electricity, carry out control of discharge.
The invention discloses also a kind of dual battery system discharge control system, specifically include monitoring cell electricity quantity unit,Comparing unit and selecting unit, the monitoring cell electricity quantity unit are used to monitor the electricity in two sets of battery systems；The comparisonUnit is for comparing the electricity in two sets of battery systems and comparison result being sent to selecting unit；The selecting unit is used forSelect the more batteries of electricity as currently used battery when powering on.
Further, above system further includes temperature monitoring unit, and the temperature monitoring unit is for monitoring two batteriesTemperature and set the corresponding lower limit discharge capacity threshold value of different temperatures, and be sent to selecting unit；Current electricity is judged according to temperatureWhen cell system electricity is lower than lower limit discharge electricity amount threshold value, the discharge capacity of two sets of battery systems is controlled.
The invention also discloses the charge control methods of the corresponding dual battery system of above-mentioned discharge control method, specific to wrapInclude following step: a kind of dual battery system charge control method specifically includes following step: Step 1: in electronic vapourCar one charge control system of setting and two sets of battery systems, two sets of battery systems are separately connected charge control system；It is described to fillElectric control system monitors the use parameter of battery in two sets of battery systems respectively and makes charge mode judgement；Step 2: rootThe parameter and charge mode detected according to charge control system in step 1 selects the wherein a set of battery system preferentially chargedSystem, charge control system issue control signal, selected battery system and external charging equipment are connected；Step 3: working as stepAfter the battery system charging complete chosen in two, charge control system judges whether to continue to be filled to other set battery systemElectricity is that other set battery system is then connected and otherwise terminates charging with external charging equipment.By the above method, realizeAn individual charging unit charges to two sets of battery systems, simplifies equipment, and electric car is enabled to carry two sets of electricityCell system improves the service life of battery system, extends the enforcement milimeter number that electric car once charges.Meanwhile even ifOne of battery breaks down, and electric car still can improve the service life of battery system with normally travel, but alsoThe satisfaction of user improves.
The flow chart of dual battery system charge control method of the invention as shown in Figure 4.The invention discloses a kind of doubleBattery system charge control method specifically includes following step: Step 1: a charge control system is arranged in electric carSystem and two sets of battery systems, two sets of battery systems are separately connected charge control system；The charge control system monitors two respectivelyCover the use parameter and charge mode of battery in battery system；Step 2: being detected according to charge control system in step 1Parameter and charge mode select the wherein a set of battery system preferentially to charge, charge control system issues control signal,The selected battery system of conducting and external charging equipment；Step 3: after the battery system charging complete chosen in step 2,Charge control system judges whether to continue to charge to other set battery system, is that other set battery system is then connectedOtherwise terminate charging with external charging equipment.By the above method, realize an individual charging unit to two sets of batteriesSystem charges, and simplifies equipment, and electric car is enabled to carry two sets of battery systems, and improve battery system uses the longevityLife, extends the enforcement milimeter number that electric car once charges.Meanwhile even if one of battery breaks down, electric carOr the service life of battery system can be improved with normally travel, but also the satisfaction of user improves.
Wherein a set of battery system that charge control system preferentially charges out according to the parameter selection detected in step 2Process it is specific as follows:
S21. the access times for comparing two sets of battery systems first select the less battery of access times, when two sets of batteriesThe access times difference of system is less than the threshold value of setting, such as 20 times, then preferentially the battery less to access times charges,Otherwise continue step S22.
S22. the state-of-charge (SOC) of the few battery system of cycle-index is judged whether in charging high efficient district, in this hairIn bright, (charging high efficient district is the relatively high one section of battery status range of battery charge efficiency, is judged according to battery SOC.If onlyThere is one of battery pack to be in high efficient district, then preferential charging, in this case, charger does work also just in same timeIt is more.) it is then to continue step S23, it is no, then it charges directly to the few battery system of cycle-index.
Step S23. judges that this charging modes belongs to trickle charge or fast charge.For example trickle charge then allows few to cycle-indexBattery charges；For example fast charge then allows to charge to the battery in high efficient district.
Step S24. for example fast charge stops when then charge to 80% to the battery of selection.By battery behavior and forSecurity consideration stops when charging to 80%.
After the battery system charging complete preferentially chosen, charge control system judges whether to continue to give other set battery systemSystem charges, and is that other set battery system is then connected and otherwise terminates charging with external charging equipment.
When judging result is to continue with to other set battery system, charge control system is executed under high pressure by switching tubeElectricity disconnects current rechargeable battery.Then another set of battery system is connected by another switching tube.
Specific steps three include:
Step S31. charge control system executes high pressure and powers on process (preliminary filling and main contactor are connected)；Preliminary filling is in order to anti-Only electric immediate current is excessive, protects circuit.Contactor is the standardized element of circuit components, and high pressure, which powers on, refers to PCU and main electricityRoad is powered.
Step S32. charge control system is restarted, and restarts charging process, and the set battery is charged to 100%.
After second set of battery system of step S33. is completely filled with, charge control system switches battery again, to charging firstBattery carry out the charging of 80%-100% and execute electricity under high pressure after all charging completes of two sets batteries, PCU and main circuit power off.
The present invention receives the high battery system of power by the preferential selection of the comparison for receiving power to dual battery system and carries outCharging.It is maintained at two sets of battery system cycle-indexes in certain value range the comparison of dual battery system cycle-index.
As shown in figure 5, Fig. 5 is the control plan in the case where judging that this charging modes is fast charge and considers to receive powerSlightly.Preferential selection receives the high battery system of power and charges, while two sets of battery system cycle-indexes being made to be maintained at certainValue range in.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all in essence of the inventionMade any modifications, equivalent replacements, and improvements etc., should all be included in the protection scope of the present invention within mind and principle.