Summary of the invention
The technical problem to be solved is that to realize a kind of electrokinetic cell monomer voltage of monitoring in real time, system the most electricPressure, temperature and electric current, analyze the health and fitness information of electrokinetic cell in time, and point out system by the way of warning under abnormalitySystem fault, makes the system of corresponding control.
To achieve these goals, the technical solution used in the present invention is: the controlling party of cell management system of electric automobileMethod, including charge control method: BMS has the function of the charging connection confirmation signal received on charging plug；
When a, entire car controller are in park mode: receiving charging plug and confirm charged state, BMS powers on and wakes up up, andBeing controlled to close total negative relay and send message to wake up entire car controller up by BMS, entire car controller enters charge mode, same to time controlClosed DC processed/DC relay, transmission charging connection and charged state message are to instrument, by instrument display charging connection and chargingState；
C, entire car controller are in and power on or during driving model: BMS sends charge information message to entire car controller, car loadController exits driving model or power up mode, enters park mode and disconnects all high voltage electric devices, then by dormancy mouldFormula enters charge mode, and controls closed DC/DC relay, and transmission charging connection and charged state message are to instrument, by instrumentDisplay charging connection and charged state；
If charging connection confirms, then BMS sends charged state, and entire car controller can not enter driving model.
Real-time communication set up by BMS and charger, and in charging process, BMS is responsible for detection each battery module voltages, temperature in real timeDegree and charging current, if breaking down, perform according to preset failure processing scheme.
Control method also includes discharge control method: when key is in ACC or ON shelves, BMS powers on and wakes up up, after waking up upBMS receives the battery enable signal that VCU sends, and the total negative relay in BMS Guan Bi battery case, battery case built-in electrical insulation detectsModule is started working, by BMS, transmission system insulating resistance value, to BMS, judges whether high tension loop exists Insulation Problems, if any absolutelyEdge problem then disconnects total negative relay.BMS gathers battery temperature, voltage, electric current, SOC value, insulation resistance and state of insulation, eventThe contents such as barrier information are sent to entire car controller, it is judged that running status and defect content, and by instrument display malfunction and SOCValue etc..
During monomer is under-voltage, temperature is too low, stagnation pressure is under-voltage secondary alarm, persistently send alarm failure and wait at car load responseReason, the most untreated lasts till time delay 3S after level fault, directly cuts off main relay.
Described preset failure processing scheme performs as follows:
If charging monomer overvoltage reaches 3s more than 4V, trouble duration, then charge power drops in alarm；
If charging monomer overvoltage reaches 3s more than 4.2V, trouble duration, then alarm disconnects charge relay；
If discharge monomer is under-voltage less than 3.2V, trouble duration reaches 3s, then alarm, drops charge power；
If discharge monomer is under-voltage less than 3V, trouble duration reaches 3s, then alarm, disconnects charge relay；
If total voltage overvoltage reaches 3s more than 376V, trouble duration, then alarm, charge power drops；
If total voltage overvoltage reaches 3s more than 394.8V, trouble duration, then alarm, disconnect charge relay；
If total voltage is under-voltage less than 300.8V, trouble duration reaches 3s, then alarm, drops charge power；
If total voltage is under-voltage less than 282V, trouble duration reaches 3s, then alarm, disconnects charge relay；
If voltage is unbalanced more than 0.3V, trouble duration reaches 3s, then alarm, drops charge power；
If voltage is unbalanced more than 0.5V, trouble duration reaches 3s, then alarm, drops charge power；
If charging temperature is too high is more than 45 DEG C, trouble duration reaches 3s, then alarm, drops charge power；
If charging temperature is too high is more than 50 DEG C, trouble duration reaches 3s, then alarm, disconnects charge relay；
If discharge temp is too high is more than 55 DEG C, trouble duration reaches 5s, then alarm, drops charge power；
If discharge temp is too high is more than 60 DEG C, trouble duration reaches 3s, then alarm, disconnects charge relay；
If charging temperature is too low is less than 10 DEG C, trouble duration reaches 3s, then alarm, drops charge power；
If charging temperature is too low is less than 0 DEG C, trouble duration reaches 3s, then alarm, disconnects charge relay；
If discharge temp is too low, less than-10 DEG C, trouble duration reaches 3s, then alarm, drops charge power；
If discharge temp is too low, less than-20 DEG C, trouble duration reaches 3s, then alarm, drops charge power；
If the unbalanced temperature difference of temperature is more than 10 DEG C, trouble duration reaches 3s, then alarm, drops charge power；
If the unbalanced temperature difference of temperature is more than 15 DEG C, trouble duration reaches 3s, then alarm, drops charge power；
If charging, stream was more than 100A, and trouble duration reaches 5s, then alarm, dropped charge power；
If charging, stream was more than 200A, and trouble duration reaches 3s, then alarm, disconnected charge relay；
If discharging, stream was more than 200A, and trouble duration reaches 3s, then alarm, dropped charge power；
If discharging, stream was more than 300A, and trouble duration reaches 5s, then alarm, disconnected charge relay；
If SOC is too high is more than 90%, trouble duration reaches 3s, then alarm, drops charge power；
If SOC is too high is more than 100%, trouble duration reaches 3s, then alarm, drops charge power；
If SOC is too low is less than 20%, trouble duration reaches 3s, then alarm, drops charge power；
If SOC is too low is less than 10%, trouble duration reaches 3s, then alarm, drops charge power；
If Insulation monitoring is less than 500 Ω/V, trouble duration reaches 3s, then alarm, drops charge power；
If Insulation monitoring is less than 100 Ω/V, trouble duration reaches 3s, then alarm, disconnect charge relay.
Described electric automobile is pure electronic light card.
Native system can divide two grades to report to the police to car load by fault seriousness, at two grades according to the abnormality of set of cellsUnder alarm condition, electric machine controller carries out downrating according to available charging and discharging currents value；Under one-level alarm condition, it is right to stopBattery carries out discharge and recharge, it is ensured that the safe handling of electrokinetic cell, effectively extends electrokinetic cell service life.
Detailed description of the invention
The present invention is when system electrification, and BMS can control pre-charge system work, prevents instantaneous large-current from impacting；By realityTime monitoring electrokinetic cell state, communicate with electric machine controller, entire car controller, charger.At vehicle operationIn, vehicle can be run necessary data and send to electric machine controller by BMS；During battery trickle charge, BMS can realize filling with vehicle-mountedCommunication between electricity equipment；During battery fills soon, BMS can realize the communication between fast fill device so that chargerThe current state of battery can be fully understood by, it is ensured that the safety of charging.BMS can be according to the abnormality of set of cells by fault seriousnessDividing two grades to report to the police to car load, in the case of secondary alarm, electric machine controller should drop according to available charging and discharging currents valuePower operation；Under one-level alarm condition, should stop battery being carried out discharge and recharge.
Concrete control method:
1, charging strategy:
On charging plug, CC signal (charging connection confirmation) is received by BMS.
When entire car controller is in park mode: BMS powers on and wakes up up, receives CC and confirm charged state, and closed by BMSClosing always to bear relay (gross vehicle load-relay) and send message and wake up entire car controller up, entire car controller enters charging mouldFormula, and control closed DC/DC relay (relay of commutator transformer on charging circuit), send charging connection and charged stateMessage is to instrument, by instrument (the display instrument on instrumental panel and/or charger in car) display charging connection and charged state.
Entire car controller is in and powers on or during driving model: BMS sends charge information message to entire car controller, car load controlDevice processed exits driving model or power up mode, enters park mode and disconnects all high voltage electric devices and (set as requiredDetermine corresponding electric appliance, such as air-conditioning, blower fan, headlight etc.), then entered charge mode by park mode, and control closed DC/DC relayDevice (relay of commutator transformer on charging circuit), transmission charging connection and charged state message are to instrument, by instrument (in carDisplay instrument on instrumental panel and/or charger) show charging connection and charged state.
Having only to charging connection confirm, BMS sends charged state, and entire car controller can not enter driving model.
Real-time communication set up by BMS and charger, and in charging process, BMS is responsible for detection each battery module voltages, temperature in real timeDegree and charging current, forbid charging as battery temperature ＞ 45 DEG C.In charging process, when any battery module voltage exceedesDuring 4.2V, BMS sends signalisation charger and stops charging, and block system relay, response time requirement≤1 second.Monomer mistakePressure, total voltage is too high, temperature too high response secondary failure is reported to the police, and machine response to be charged processes, and the most untreated is persistently upgraded toTime delay 3S after level fault, directly cuts off main relay.
2, discharge control method:
When key is in ACC or ON shelves, BMS powers on and wakes up up, wakes up rear BMS up and receives the battery enable that VCU sendsSignal, the total negative relay in BMS Guan Bi battery case.Battery case built-in electrical insulation detection module is started working, and sends system insulationBy BMS, resistance value, to BMS, judges whether high tension loop exists Insulation Problems, then disconnect total negative relay if any Insulation Problems.BMS gathers battery temperature, voltage, electric current, SOC value, insulation resistance and the content such as state of insulation, fault message and is sent to car load controlDevice processed, it is judged that running status and defect content, and shown malfunction and SOC value etc. by instrument.
During monomer is under-voltage, temperature is too low, stagnation pressure is under-voltage secondary alarm, persistently send alarm failure and wait at car load responseReason, the most untreated lasts till time delay 3S after level fault, directly cuts off main relay.
3, safety protection control method:
Above in conjunction with accompanying drawing, the present invention is exemplarily described, it is clear that the present invention implements not by aforesaid wayRestriction, as long as have employed the method design of the present invention and the improvement of various unsubstantialities that technical scheme is carried out, or without changingEnter and design and the technical scheme of the present invention are directly applied to other occasion, all within protection scope of the present invention.