CN105116819A - Battery management main system suitable for new energy automobile and control method thereof - Google Patents

Abstract

The invention provides a battery management main system suitable for a new energy automobile and a control method thereof, wherein the battery management main system comprises an MCU module, a power management module, a current detection module, a liquid crystal display module, a whole group of voltage and insulation performance measurement module, a heat management module, a clock module and a storage module; the MCU module estimates the internal state SOC and SOE of the battery pack by reading the current data of the current detection module, the total voltage and insulation resistance data measured by the whole group of voltage and insulation performance measurement module and the single battery terminal voltage and temperature data sent by the acquisition module through the CAN channel, drives the heat management module to carry out heat management on the battery pack, sends battery state information and alarm information to the liquid crystal display module, and stores corresponding diagnosis information into the storage module. The invention has the advantages of realizing the utilization and protection of the automobile battery to the maximum extent, improving the energy utilization efficiency, saving energy, reducing emission and ensuring the use safety.

Description

A kind of battery management main system and control method thereof being applicable to new-energy automobile

Technical field

The invention belongs to the battery management system field of new-energy automobile, especially relate to a kind of the battery management main system and the control method thereof that are applicable to new-energy automobile.

Background technology

Battery management system is the important spare part of hybrid vehicle, and common distributed battery management system forms from plate and control main system by gathering.Wherein, main system plays core controlling functions in whole battery management system.Main system reads voltage and the temperature data of each cell in the power brick that gathers and collect from plate, and gather charging and discharging currents and the total voltage of power brick, by to these voltage, electric current and temperature enter data line analyzing and processing, realize power brick using state as state-of-charge (StateOfCharge, and health status (StateOfHealth SOC), SOH) real-time online estimation, and control according to the charge and discharge process of battery status to battery, prevent over-charging of battery, cross and put, to realize extending battery, increase the object of vehicle course continuation mileage.Therefore, battery management system to the accuracy of data acquisition of main system, with require higher from plate communication speed, large data-handling capacity.

Battery management system is still short at China's development time, and main system is many in addition improves aspect:

(1) main system with gather from plate communication aspect: relate to communication data amount large, gather from problems such as plate quantity are many, and principal and subordinate's model calling mode many employings LIN bus of existing product, connected mode multiplex Y-connection or connected in series, Y-connection extendability is poor, connected in series from plate number be subject to bus load ability restriction, limit the number of battery in Systematical control power brick;

(2) system power dissipation aspect: battery management system is powered by Vehicular accumulator cell, and Vehicular accumulator cell is charged through DCDC by electrokinetic cell.Existing product does not take into full account system low-power consumption requirement;

(3) temperature is very large on the impact of electrokinetic cell usability, and existing product lacks perfect and that capacity usage ratio is high thermal management scheme.

Summary of the invention

In view of this, the present invention is intended to propose a kind of battery management main system and control method thereof being applicable to new-energy automobile, to realize maximally utilising and protecting automobile batteries, improves the efficiency of energy utilization, energy-saving and emission-reduction, ensures the security used.

For achieving the above object, technical scheme of the present invention is achieved in that

A kind of battery management main system being applicable to new-energy automobile, comprise MCU module, power management module, current detection module, LCD MODULE, whole group of voltage and insulating property measurement module, thermal management module, clock module and memory module, described MCU module is connected with described power management module, described power management module is described current detection module, described LCD MODULE, described whole group of voltage and insulating property measurement module, described thermal management module, described clock module and described memory module are powered, described current detection module is connected to an A/D ALT-CH alternate channel of described MCU module, described thermal management module is connected to the 2nd A/D ALT-CH alternate channel of described MCU module, described memory module is connected to a SPI passage of described MCU module, described clock module is connected to the 2nd SPI passage of described MCU module, described whole group of voltage and insulating property measurement module are connected to the Three S's PI passage of described MCU module, described LCD MODULE is connected to the RS232 communication port of described MCU module, described MCU module is also provided with multichannel CAN passage, each connected in series respectively on CAN passage described in first three road of described MCU module have 4 acquisition modules.

Further, described MCU module is XC2287 chip, and described MCU module is provided with five road CAN passages, and the electronic equipments such as the external entire car controller of CAN passage, charging set described in the 4th tunnel and OBD demarcate, and described in the 5th tunnel, CAN passage is as reserved passageway.

Further, described power management module comprises power supply EMI filter circuit and low-power consumption treatment circuit, described power supply EMI filter circuit comprises electromagnetic interface filter L1, first diode VD1, second diode VD2, first resistance R1, first electric capacity C1, second electric capacity C2 and the 3rd electric capacity C3, automobile batteries power supply directly accesses the positive pole of described first diode VD1, negative pole through described first diode VD1 outputs to the input end of described electromagnetic interface filter L1, and be connected to described second diode VD2 between the input end of described electromagnetic interface filter L1, described first resistance R1 and described first electric capacity C1, described second electric capacity C2 and described 3rd electric capacity C3 is connected between the output terminal of described electromagnetic interface filter L1, described low-power consumption treatment circuit comprises voltage conversion circuit and output control circuit, described voltage conversion circuit comprises voltage conversion chip NCV4274, self-recoverage diode FI, 4th electric capacity C4, 5th electric capacity C5 and the 6th electric capacity C6, voltage after described power supply EMI filter circuit filtering process is connected to described self-recoverage diode FI, the input end of described voltage conversion chip NCV4274 is accessed through described self-recoverage diode FI, and be connected to described 4th electric capacity C4 and described 5th electric capacity C5 between described self-recoverage diode FI and the input end of described voltage conversion chip NCV4274, the output terminal of described voltage conversion chip NCV4274 is connected to described 6th electric capacity C6, described output control circuit comprises a MOSEFT pipe VT1, 2nd MOSEFT pipe VT2, 3rd MOSEFT pipe VT3, 4th resistance R4, 5th resistance R5, 6th resistance R6, 7th resistance R7, 8th resistance R8 and the 9th resistance R9, control signal+the 12V_EN of described MCU accesses the grid of described 2nd MOSEFT pipe VT2 through described 6th resistance R6, and be connected with described 7th resistance R7 between the grid of described 2nd MOSEFT pipe VT2 and ground, 12V voltage+12VOUT after described power supply EMI filter circuit filtering process is connected to a described MOSEFT pipe VT1 source electrode, be connected to a MOSEFT pipe VT1 grid through described 4th resistance R4 simultaneously, a described MOSEFT pipe VT1 grid is connected through the 5th resistance R5 and the described 2nd MOSEFT pipe VT2 pole that drains, control signal+the 12V_EN of described MCU control described 2nd MOSEFT pipe (VT2) by and conducting, determine the voltage being loaded into a described MOSEFT pipe VT1 grid, and then control the output+12VP of a described MOSEFT pipe VT1, through the source electrode of the described 3rd MOSEFT pipe VT3 of low-voltage+5V access that described stabilized voltage supply voltage conversion chip NCV4274 exports, and the grid of described 3rd MOSEFT pipe VT3 is connected to through described 9th resistance R9, control signal+the 5V_EN of described MCU accesses the grid of described 3rd MOSEFT pipe VT3 through described 8th resistance R8, in order to control cut-off and the conducting of described 3rd MOSEFT pipe VT3, control power supply+5VP to export, described power management module is by the 12V voltage+12VOUT after described power supply EMI filter circuit filtering process, controlled to export power supply to described current detection module by the cut-off of a described MOSEFT pipe VT1 and described 2nd MOSEFT pipe VT2 and conducting, described LCD MODULE and described thermal management module, the 5V voltage that described power management module will transform through described voltage conversion circuit, controls to export+5VP by the cut-off of described 3rd MOSEFT pipe VT3 and conducting and powers to described MCU module, described whole group of voltage and insulating property measurement module, described clock module and described memory module.

Further, described current detection module comprises reference power source circuit and current detection circuit, described reference power source circuit comprises the 11 electric capacity C11, 13 resistance R13, TL431B, 14 resistance R14, 15 resistance R15, 12 electric capacity C12, 13 electric capacity C13 and the 14 electric capacity C14, 12V voltage+12VOUT after the filtering of described power supply EMI filter circuit and described low-power consumption processing circuit processes accesses the filtering circuit that described 11 electric capacity C11 and described 13 resistance R13 forms, be input to the input end of described TL431B, the output terminal of described TL431B also meets described 14 resistance R14 and described 15 resistance R15, the two ends of output voltage are also connected to described 13 electric capacity C13 and described 14 electric capacity C14, described current detection circuit comprises the 80 resistance R80, the 81 resistance R81, the 82 resistance R82, the 83 resistance R83, the 48 electric capacity C48, the 49 electric capacity C49, the 50 electric capacity C50 and the 51 electric capacity C51, and resistance and capacitance group synthesize four RC wave filters.

Further, described LCD MODULE comprises Liquid Crystal Module power converting circuit and RS232 telecommunication circuit; Described Liquid Crystal Module power converting circuit comprises boost chip GS3362, triode VT5, the tenth resistance R10, the 11 resistance R11, the 12 resistance R12 and the 13 resistance R13,12V voltage+12VOUT after after described power supply EMI filter circuit filtering process and described low-power consumption treatment circuit accesses the collector of described triode VT5, be input to the input end of described boost chip GS3362, the output terminal of described boost chip GS3362 exports the voltage after boosting; Described RS232 telecommunication circuit comprises MAX2232 chip and peripheral circuit thereof for the Transistor-Transistor Logic level of standard being converted to RS232 level.

Further, described whole group of voltage and insulating property measurement module comprise total voltage metering circuit and insulating property metering circuit; Described total voltage metering circuit comprises DCDC isolation, the 70 electric capacity C70, the 71 electric capacity C71, the 72 electric capacity C72, the 73 electric capacity C73, the 89 resistance R89, the 90 resistance R90, digital isolator ADUM1401 and A/D acquisition chip ADS7844, potential-divider network is formed after described 89 resistance R89 and described 90 resistance R90 is connected in series, power brick voltage after dividing potential drop inputs described A/D acquisition chip ADS7844, and the output terminal of described A/D acquisition chip ADS7844 exports collection by SPI communication interface and is worth to described MCU module; Described insulating property metering circuit comprises photoelectrical coupler N27, N28 for controlling to be incorporated to and to disconnect, the 87 resistance R87, the 88 resistance R88, the 91 resistance R91, the 92 resistance R92, the 93 resistance R93 and the 94 resistance R94.

Further, described thermal management module comprises load driving circuits, described load driving circuits comprises power control chip BTS5235 and peripheral circuit thereof, the output quantity of the input end access amount control output end of described power control chip BTS5235, the output terminal access load of described power control chip BTS5235.

Further, described clock module is that described MCU module is provided with special hardware watchdog circuit, described hardware watchdog circuit, switch chip SP690 and N2174HC1 by automatic spare device battery to form, receive the VCC end of SP690A through the 5V power supply of described power module process, the 51 electric capacity C51 receives the VCC of SP690A to power filter, the VDD that the output terminal VOUT of SP690A is connected to clock chip PCA21125 powers, the output terminal of 74HC1 is connected to the reset terminal of MCU, pwm control signal WATCH_DOG from described MCU module feeds dog to SP690A, SP690 carries hardware watchdog function, RST pin exports reset signal and holds to the INA of 74HC1, the input INB that the control pin DIS_W_DOG of MCU is connected to 74HC1 holds, 61 resistance R61 is pull-up resistor, receive through between the 5V power supply of described power module process and the INB pin of 74HC1, 54 electric capacity C54 is filter capacitor, receive between the VCC pin of 74HC1 and ground.62 resistance R62 is pull down resistor, receives between the output pin OUTY of 74HC1 and ground.

Be applicable to a control method for the battery management main system of new-energy automobile, comprise the following steps:

(1) start MCU module, switch gear to system electrification or insertion charging set plug by system electrification or ignition key switch;

(2) MCU module carries out variable-definition and initialization thereof;

(3) power management module is started, to described memory module, described clock module, isolation A/D modular converter, CAN module, power control module, LCD display module powers on;

(4) initialization of peripherals and the setting of state thereof, comprises and arranges current detection module, LCD MODULE, whole group of voltage and insulating property measurement module, thermal management module, clock module and memory module and acquisition module;

(5) read memory module, obtain SOC, SOE required for described MCU module and estimate the general and OBD diagnosis content of arteries and veins, and obtain whole electric battery SOC and SOE initial value SOC _init, SOE _init, total electric battery whole group of maximum available Q _max, each cell monomer maximum available capacity Q _imax, time of repose t, leaves standstill and refers to when battery set charge/discharge current absolute value is less than 50mA;

(6) read clock module, obtain system clock;

(7) under the setting of clock module, every 10 milliseconds of conversions once, by obtaining whole assembled battery total voltage value with the channel attached whole group of voltage of Three S's PI and insulating property measurement module, obtain battery set charge/discharge current value by the current detection module be connected with an A/D ALT-CH alternate channel;

(8) when detecting insulation resistance, adopt in a stationary situation, 500 milliseconds are detected once, primary insulation within 1 second, is asked to estimate resistance value, when first 500 milliseconds time, when the control signal CELL0_EN from MCU module is effective, first optical coupled switch closes, the voltage of whole electric battery is added in whole resistance measurement network, and wherein VGND is bonding ground on automobile, and Insulation monitoring mainly measures the whole Battery pack positive pole of power and the negative pole resistance R to bonding ground _high-gndand R _low-gnd.Measuring process is as follows:

Time control signal CLONE from MCU module is invalid, the second optical coupled switch is opened, and the 87 resistance R87 is incorporated to resistor network, at this time, is measured the voltage V at the 91 resistance R91 two ends by ASD7844 _r91, from the control signal CLONE of MCU module is effective time, the second optical coupled switch closes, the 87 resistance R87 short circuit from resistor network, at this time, is measured the V at R91 two ends by ASD7844 _r91 ¹voltage, according to circuit theory, obtains equation:

V _R91/V _R91 ¹＝R88+R _high-gnd/R87+R88+R _high-gnd；

In like manner, time the control signal CLTOW from MCU module is invalid, the 3rd optical coupled switch is opened, and the 87 resistance R87 is incorporated to resistor network, at this time, is measured the voltage V at the 92 resistance R92 two ends by ASD7844 _r92, time the control signal CLTOW from MCU module is effective, the 3rd optical coupled switch closes, the 87 resistance R87 short circuit from resistor network, at this time, is measured the voltage V at the 92 resistance R92 two ends by ASD7844 _r92 ¹, according to circuit theory, obtain equation:

V _R92/V _R92 ¹＝R94+R _low-gnd/R93+R94+R _low-gnd；

Solve R thus _high-gndand R _low-gnd;

(8) whether first via CAN passage receives data, if the data of receiving, then classification process data, first via CAN passage receives at most the data of 4 sub-acquisition systems, every sub-acquisition system have maximum 12 road monomer voltages, 8 tunnel temperature, whole group of voltage and half group of voltage and 6802 status information and warning message, otherwise, jump to (9);

Whether (9) second road CAN passages receive data, if the data of receiving, then classification process data, second road CAN passage receives at most the data of 4 sub-acquisition systems, every sub-acquisition system have maximum 12 road monomer voltages, 8 tunnel temperature, whole group of voltage and half group of voltage and 6802 status information and warning message, otherwise, jump to (10);

Whether (10) the 3rd road CAN passages receive data, if the data of receiving, then classification process data, CAN passage 3 receives at most the data of 4 sub-acquisition systems, every sub-acquisition system have maximum 12 road monomer voltages, 8 tunnel temperature, whole group of voltage and half group of voltage and 6802 status information and warning message, otherwise, jump to (11);

(11) estimate that power brick using state is as state-of-charge (StateOfCharge), referred to as SOC;

Gained SOC and S0C is once estimated upper _iNITampere-hour integration is carried out on basis, and formula is as follows:

$SOC={\mathrm{SOC}}_0-\frac{1}{C_E}\underset{0}{\overset{t}{\∫}}Idt;$

Wherein, SOC0=S0C _iNIT, I is power brick charging and discharging currents, and during electric discharge, current value gets negative value, and during charging, current value is got on the occasion of, CE=Q _mAX;

(12) arteries and veins general estimation SOE (StateOfHealth) is estimated according to SOE;

(13) the 4th road CAN passage and MCU module is driven to carry out alternately;

(14) according to the temperature gathered, voltage, current information, heat management, power management, safety management etc. are carried out to battery charge and discharge process;

(15) diagnose for the data of battery charge and discharge process and operating mode, record trouble code also takes countermeasure;

(16) storage battery bag discharge and recharge data and OBD diagnostic message;

(17) start serial ports, the information such as voltage, electric current, SOC and warning are delivered to touch-screen display;

(18) if press prosthetic charge button in system charging process, system starts prosthetic charge function and controls charging process, thus realizes the correction to power brick state-of-charge SOC, and charging process is as follows:

A) Systematical control battery standing more than 2 hours, gathers each cell terminal voltage, obtains each cell SOCiint by looking into SOC-OCV table;

B) charging is carried out to battery and put charging by voltage, or ensure that charge volume is greater than 1/2nd of power brick capacity, obtain charge volume Δ AH by ampere-hour integral and calculating _fill;

C) leaving standstill more than 2 hours, gather each cell terminal voltage, obtaining each cell SOCiend by looking into SOC-OCV table;

D) according to above-mentioned data, the SOC result that current integration in battery charge and discharge process calculates gained is revised.

(19) if system at rest detected after system charging complete, namely charging current is less than 50mA, and electric battery carries out equalization discharge, and hardware implementing is realized by acquisition module, software controlling strategies is realized by master control system, and balanced end condition is that each monomer battery voltage difference is less than 0.05V.

Relative to prior art, of the present invention be applicable to new-energy automobile battery management main system and control method there is following advantage:

1) special low-power dissipation power supply administration module is designed with, after system enters dormancy, cut off opposite heat tube reason module, the 12V of LCD MODULE powers and export and to power output to the 5V of MCU module, current detection module, whole group of voltage insulation performance measurement module, clock module, memory module, thus meet system low-power consumption demand, quiescent current is 3mA, for the maximum utilization of limited battery power provides the foundation, there is good power saving function;

2) master control system and the communication network connected mode of collection plate have employed star and the mode combined connected in series, master control system has 5 CAN nodes, wherein front 3 CAN nodes are used for and gather the communication from plate, each node adopts mode connected in series to connect from plate, maximum 4 can be connected gather from plate, eachly can gather maximum 12 road monomer battery voltages from plate, the 5th CAN node is reserved resource, for system extension.Such system can gather at most 144 pieces of monomer battery voltages, can meet the user demand of new-energy automobile, and expansion is convenient;

3) power brick heat management is convenient, is designed with special thermal management module.When detecting that power brick temperature is too high, starting supply fan and with fan of giving vent to anger, power brick being cooled; When detecting that power brick temperature is too low, Resistant heating or starting engine chilled water can be adopted to heat two kinds of type of heating, and especially the utilization of engine cooling water, improves energy utilization rate.

4) be designed with special watchdog circuit, ensure that the high reliability of system.

Accompanying drawing explanation

The accompanying drawing forming a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:

Fig. 1 is the overall system structure block diagram of the embodiment of the present invention;

Fig. 2 is the power management module circuit diagram of the embodiment of the present invention;

The reference power source circuit figure of Fig. 3 embodiment of the present invention;

The current detection circuit circuit diagram of Fig. 4 embodiment of the present invention;

The LCD MODULE circuit diagram of Fig. 5 embodiment of the present invention;

Whole group of voltage of Fig. 6 embodiment of the present invention and insulating property measurement module circuit diagram;

The thermal management module circuit diagram of Fig. 7 embodiment of the present invention;

The memory module circuit diagram of Fig. 8 embodiment of the present invention;

The CAN module circuit diagram of Fig. 9 embodiment of the present invention;

The control flow chart of Figure 10 embodiment of the present invention.

Description of reference numerals:

1-MCU module, 2-power management module, 3-current detection module, 4-LCD MODULE, 5-whole group of voltage and insulating property measurement module, 6-thermal management module, 7-clock module, 8-memory module, 9-acquisition module.

Embodiment

It should be noted that, when not conflicting, the embodiment in the present invention and the feature in embodiment can combine mutually.

Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.

As shown in the figure, the battery management main system being applicable to new-energy automobile of the present invention comprises MCU module 1, power management module 2, current detection module 3, LCD MODULE 4, whole group of voltage and insulating property measurement module 5, thermal management module 6, clock module 7 and memory module 8, master control system provides required 5V and 12V voltage and low power consumption control by power management module 2, each monomer battery voltage and temperature data that acquisition module 9 collects is read by first three road CAN passage in MCU module 1, by the charging and discharging currents of two Air conduct measurement power brick of current detection module 3, total voltage and the insulation resistance of power brick is detected by whole group of voltage and insulating property measurement module 5, MCU module 1 is to the voltage collected, electric current and temperature data process, comprise SOC and SOH by the using state of internal algorithm to battery to estimate, and according to the data gathered and result of calculation, the relay in high-voltaghe compartment and thermal management module 6 are controlled, thus control the charge and discharge process of battery and fault diagnosis and dealing is carried out to the abnormal conditions in charge and discharge process, the time variable wherein needed in algorithm provided by clock module 7 and through MCU module 1 the 2nd SPI passage read, image data and result of calculation and OBD diagnostic message store to memory module 8 through a SPI channel transfer of MCU module 1, SOC, SOH result of the voltage collected, electric current, temperature information and estimation and system alarm information are sent to LCD MODULE 4 through the RS232 communication port of MCU module 1 and show.

Respectively modules is elaborated respectively below:

Described MCU module 1, adopts XC2287 chip, and it is low-power consumption, high performance 16 8-digit microcontrollers of automotive grade of the production of Infineon company.XC2287 has 5 level production line high-performance 16 bit CPUs, there is the RAM of 768KBFLASH and 64KB, and the dominant frequency of 80M, the performances such as single command cycle meet complicated algorithm needs completely, its 96 interrupt vectors, 8 groups, often organize 12 Priority interrupt resources, and peripheral events interrupt management, do not need MCU to support, can interrupt shortest time response periphery, satisfy condition harsh real-time system requirement.XC2287 peripheral resource has: two 10 independently A/D converters, can meet the requirement that 24 road A/D change, and has autoscan, passage injects and data compression function; Catch/comparing unit for two, totally 4 16 bit timing device/counters; 4 signal captures and generation unit CCU6; Two general purpose timer unit comprise 5 16 bit timing devices; Nearly six data channel, can be used for UART, SPI, IIS, IIC and LIN; Controller local area network (MultiCAN) supports V2.0B agreement, and nearly five road CAN passage contacts, can work independently or exchange data by gateway.MCU module 1 reads the data of current acquisition module 3 by an A/D ALT-CH alternate channel; The closed loop current signal of thermal management module 6 is detected, to realize the diagnosis of opposite heat tube reason system drive by the 2nd A/D ALT-CH alternate channel; Be connected with data memory module 8 expansion realizing data-carrier store by a SPI passage; By the 2nd SPI passage and clock module 7 mutual; Be connected with whole group of voltage and insulating property measurement module 5 by Three S's PI passage, realize the measurement of whole group of voltage and insulating property; Front 3 road CAN passages are used for the exchanges data with sub-acquisition system, and the 4th road CAN is used for communicating with other electronic equipment and OBD demarcation, and the 5th road CAN is system extension reserved passageway.

As shown in Figure 2, described power management module 2, mainly comprises power supply EMI treatment circuit and low-power consumption treatment circuit.

Automobile there are strong power supply crosstalk and electromagnetic interference.Described power supply EMI treatment circuit mainly inputs automobile power source to 12V and processes, to reach the design requirement of system to power supply.EMI treatment circuit is made up of VD1, VD2, R2, C1, C2, C3, L1.System primary power is from automobile batteries plant-grid connection, input voltage range is 9-36V, Vehicular battery input power 9-36V is by diode VD1, VD1 is MR850G, its function prevents input power reversal connection, and when input power reversal connection, VD1 ends, system does not have electric current, and such lower computer system would not issue stiff functional damage at reverse power connection.VD2 is TVS transient voltage suppresser SMAJ36CA; its effect absorbs surge power; when moment high energy impact events is stood at VD2 two ends; it can become Low ESR the resistance value between two ends from high impedance with high speed; absorb a big current; thus the voltage clamping of two sections is numerically predetermined at one, protection element does not below damage because of the high-voltage impact of moment.R1 adopts voltage dependent resistor (VDR) CVX80A470M, and its effect is protection subsequent conditioning circuit, and when having high voltage or transient pulse, its work, is used for absorbing high pressure or transient pulse, the input of stabilized power source.C1 is the electric capacity of 0.1uF, and it can absorb differential mode high frequency interference.The high-performance electromagnetic interface filter that L1 is made up of feed through capacitor, Large Copacity ceramic capacitor and ferrite bean etc., this type of wave filter effectively can suppress from low to high the EMI noise in very broad frequency range.C2 is the electric capacity of 0.1uF, absorbs differential mode high frequency interference further.C3 is the electrochemical capacitor of 50V, 1000uF, and it can level and smooth power supply output ripple, absorbs low-frequency disturbance.By a series of EMI process, system power supply meets automobile and normally works under electronic striking or power supply fall strong interference.

Described low-power consumption treatment circuit is to meet system low-power consumption design function, and when system enters low-power consumption, except MCU and the work of Related arousal source, other all peripheral circuit all enters power-down state.The design has used periphery 12V and 5V power supply, and voltage transitions is completed by voltage conversion circuit.Described voltage conversion circuit is made up of NCV4274, self-recoverage diode FI, electric capacity C4, C5, C6.Wherein, NCV4274, it is high-performing car voltage conversion chip LDO; maximum input voltage is 45V, and output current is 450mA, and quiescent current is extremely low; before its input, with F1 self-recoverage diode, adopt 60V withstand voltage here; the self-recoverage diode of 0.5A, when system mains current is greater than 0.5A, F1 works; primary power disconnects, and protection lower computer system hardware security, when mains current is less than 0.5A; F1 is equivalent to conductor, and power good passes through F1.12V powers to AD reference power source circuit, LCD MODULE, thermal management module, and 5V powers to MCU module, whole group of voltage insulation performance measurement module, clock module, memory module.Native system devises low-power consumption treatment circuit management 12V and 5V feed circuit.Wherein, the management of 12V feed circuit has been come by MOSEFT pipe VT1 and VT2, and when the G of VT2 is very low, VT2 ends, the S pole of VT1 and D pole be all 12V, VT1 also end 12VOUT can not output voltage to sub-acquisition system; When the G of VT2 is very high, VT2 conducting, very 12V, D are very low for the S of VT1, such VT1 conducting, 12VOUT energy output voltage, and this 12V power management outputs to sub-acquisition system power supply; 5V feed circuit adopt MOSEFT pipe VT3 to realize, and when the G of VT3 is very low, VT3 conducting, peripheral 5V power supply exports effectively, and when the G of VT3 is very high, VT3 ends, peripheral 5V power withheld.

As shown in Figure 3,4, described current detection module 3, comprises reference power source circuit and current detection circuit.As shown in Figure 3, described reference power source circuit is for AD conversion module provides reference voltage, realizes AD conversion and primary power separately design, avoids the impact that primary power fluctuates on AD conversion precision, thus improve system accuracy.Described reference power source circuit adopts TL431B to realize, and TL431B is big current, the reference power source of good stability, and its maximum current can arrive 100mA.The filtering circuit that 12V power supply after power supply process forms through C11 and R13, is input to the input end of TL431B, by the coupling of R14 and R15, exports as 5V voltage, is supplied to A/D modular converter as the reference voltage.As shown in Figure 4, described current detection circuit, current sensor adopts DHABS/25, it is under automotive grade working temperature, employing two-way exports, it is-100A to+100A that the first via exports measurement range, it is-600A to+600A that second tunnel exports measurement range, it exports as voltage signal, and has been isolated by amplifier, and just design forms 4 RC network wave filters by R80, R81, R82, R83, C48, C49, C50, C51 here, be divided into two groups, DHABS/25 two-way output signal is connected with the A/D1 translation interface of XC2287 respectively by after two groups of wave filters.

As shown in Figure 5, described LCD MODULE 4, comprises Liquid Crystal Module power conversion and RS232 telecommunication circuit.The liquid crystal adopted is power supply needed for MT6050I, MT6050I is 24V, and data-interface is RS232, and native system is 12V electric power system, so 12V voltage will be raised to 24V.The design of Liquid Crystal Module power converting circuit is as follows: boost chip adopts GS3362, and the 12VP voltage after power management module process is input to the input end VIN of GS3362.Realize its power switch by triode VT5, when the input of VT5 base stage is effective, GS3362 works, and exports 24V voltage from SW end, and when the input of VT5 base stage is invalid, GS3662 does not work, and SW end does not export 24V voltage.Adopt MAX2232, MCU serial ports to export by MAX2232 with liquid crystal MT6050I interface communication RS232 level conversion, just convert the Transistor-Transistor Logic level of standard to RS232 level.

As shown in Figure 6, described whole group of voltage and insulating property measurement module 5, be divided into total voltage metering circuit and insulating property metering circuit.

Described total voltage metering circuit, the most high energy of voltage of whole electric battery reaches 600V, and have certain difficulty to its voltage acquisition, native system method for designing is, whole acquisition module and MCU isolation of system, so just can ensure the security of MCU system.Because acquisition module voltage is high, and MCU module is 5V voltage, needs isolation design to ensure hardware capability, and the design adopts DC/DC to isolate MCU module power supply and acquisition function modular power source.AD conversion adopts ADS7844, R89 and R90 to form potential-divider network, 600V voltage is divided in the scope of A/D conversion input, so that A/D conversion gathers.A/D acquisition chip adopts ADS7844, and it is the A/D of 12, has 10 passages, adopts SPI communication interface to export the value of A/D collection, and SPI interface, by communicating with the SPI3 of main MCU after ADUM1401 isolation, realizes the exchanges data between acquisition module and main MCU.

The impedance between electric battery and vehicle bonding ground is measured in described insulativity measurement, leak electricity to prevent electric battery high-tension electricity, meet accident, here resistor network is adopted to realize measuring, adopt photoelectrical coupler to realize Survey control, realized by R87, R88, R91, R92, R93, R94 and AG74, R93.Between assembled battery total voltage and bonding ground impedance and electric battery ground and bonding ground between impedance have Two Variables, N27AC38 photoelectrical coupler is adopted to realize being incorporated to of resistance R87 and disconnect, and N28AG74 photoelectrical coupler realizes being incorporated to of R93 and disconnects, R91 is measured by ADS7844, voltage between R92 and bonding ground, such composition two prescription journey, obtain the data of insulativity, CELL0_EN is the power consumption controlling whole measuring system, when needs are measured, CELL0_EN is effective, the voltage of whole electric battery joins measurement network, can measure, when CELL0_EN is invalid, disconnect whole battery voltage, so just do not consume tested battery voltage, economize energy.

As shown in Figure 7, described thermal management module 6, is lowered the temperature to battery case by an air inlet fan and an air-out fan, is heated by resistance wire or engine coolant to battery case.Fan, resistance wire and engine cool hydraulic control valve adopt identical circuit to drive.Thermal management module 6 is made up of load driving circuits.Described driving circuit is made up of the power control chip BTS5235 of intelligence and peripheral circuit thereof.BTS5235 is the power control chip of intelligence, its maximum input voltage is 28V, have two-way to control to export, it is 3.3A that every road exports maximum current, has very low road energising resistance, be 60m Ω time road leads to, also there is very low quiescent current, meet system low-power consumption designing requirement, the compatible Transistor-Transistor Logic level of its steering logic, and there is output power feedback current closed loop detect function, this is the household function meeting OBD diagnosis.The I/O port of MCU connects IN1 and IN2 of BTS5235, export OUT1 and OUT2 to the two-way of BTS5235 to control, OUT1 with OUT2 is connected load, after IN1 or IN2 is effective, BTS5235 power stage OUT1 or OUT2 is effective, promotes load, after IN1 or IN2 is invalid, OUT1 or OUT2 is invalid for BTS5235 power stage, and do not add voltage to load, load does not work.SEN is BTS5235 function control end, connects the control of IO pin realization to BTS5235 input and output of MCU, when SEN is high, and BTS5235 two control inputs output enables, when SEN is low, BTS5235 two control inputs export to be forbidden, quiescent dissipation is low; IS1 and IS2 is that bearing power feedback current exports, the power that its electric current exported and load consume is directly proportional, when load consuming power height, it exports big current, when load consuming power hour, it exports small area analysis, transfers current signal to voltage signal in the design by resistance R12, R12, R18, R19, is connected to each passage of the AD2 of MCU; Identify load power consumption state when being used for identifying and loading to load, MMBZ5V6A is voltage-limiting protection effect, when the voltage on IS is more than 5V time, likely the A/D of MCU is inputted and damages, and MMBZ5V6A is ensureing the input range of input at 0-5V of A/D.The reference voltage of A/D2 adopts the 5V voltage of TL431B output.

Described clock module 7 comprises clock generation circuit and reserve battery commutation circuit.BMS battery management system needs record present battery characteristic and some states and OBD diagnostic message, native system devises the time origin of clock system as system log (SYSLOG), XC2287 has time clock feature, but native system has low-power consumption function, after system enters low-power consumption, central controller just cuts out all external powers, only leave wake source work, therefore after entering low-power consumption, the CPU of MCU and oscillating circuit will quit work, the clock of XC2287 also quits work, system passes through the SPI Interface Expanding of MCU clock system, and in conjunction with the reset circuit of XC2287 and hardware watchdog function, devise backup battery handoff functionality.

Described clock generation circuit is made up of clock chip PCA21125 and peripheral circuit thereof, and PCA21125 is a automotive grade clock and calendar chip, its exemplary operation power consumption and low, only has 0.55 μ A, meets the working environment of backup battery system finite energy.Be input as the clock of 32.768HZ, be transformed into calendar and block pattern by internal counter.Peripheral circuit comprises C52, C53, crystal oscillator, filter capacitor C54, C55, resistance R58, R59, R60.PCA21125 Enable Pin is controlled by MCU, and output terminal adopts SPI interface to be connected with the SPI2 of MCU.

Described reserve battery commutation circuit, reserve battery adopts SBAA02P, and it is the reason ion battery of 3.6V and 1.2Ah, have technical grade temperature range, voltage is high and steady, long service life, it there is no electricity as automobile storage battery or lower than 3.6V time, clock module adopt standby power supply.Electrical source exchange adopts SP690A to realize.SP690 is that automatic spare device battery switches chip with hardware watchdog function, when reserve battery and normal battery have electricity, SP690A exports as normal power source, such clock module just uses vehicle battery power supply, when SP690A input normal power voltage lower than backup battery voltage, SP690A with regard to automatic switchover output voltage to backup battery voltage.In order to ensure the high reliability of system, be designed with hardware watchdog function.As MCU because interference or software swing machine, just do not feed dog to SP690A, SP690A exports reset mode and just to reset MCU, thus the normal work of the system of guarantee.In order to meet system low-power consumption function, after MCU enters low-power consumption, hardware watchdog just can not work.The design adopts 74HC1 to realize hardware watchdog and low-power consumption function.The PWM pin of MCU is connected to the WDI end of SP690A, and the input INA that the RST of SP690A is connected to 74HC1 holds, and the input INB that the DIS_W_DOG of MCU is connected to 74HC1 holds.C51 is connected between the 5V power supply of input and reserve battery SBAA02P, and the VDD that the output terminal of SP690A is connected to PCA21125 powers, and the output terminal of 74HC1 is connected to the reset terminal of MCU.After MCU wakes up from low-power consumption, it is low for removing DIS_W_DOG, like this, the RESET state that SP690A exports just exports the output terminal at 74HC1, when not feeding dog to SP690A, SP690A exports reset signal, reset MCU, when system enters after low-power consumption falls dot pattern, the DIS_W_DOG of 74HC1 is high, and like this, the RESET state no matter SP690A exports how, the output terminal of 74HC1 is always high, and so just can not reset MCU.

Described memory module 8 as shown in Figure 8, the storage of BMS system needs take time as battery power discharge and the charge data of basic point, and the OBD information of whole central controller and all sub-acquisition systems, this just needs a data back to store these MAP, the design adopts CAT25256, and CAT25256 has 32KB bytes store amount, has 64 bytes to write buffer memory, adopt SPI interface to be connected with SCR controller MCU, there is 10M traffic rate.CS, WP, HOLD pin of CAT25256 is connected to the control of I/O port realization to CAT25256 of MCU.

As shown in Figure 10, control method of the present invention:

(1) start MCU module, switch gear to system electrification or insertion charging set plug by system electrification or ignition key switch;

(2) MCU module carries out variable-definition and initialization thereof;

(3) power management module is started, to described memory module, described clock module, isolation A/D modular converter, CAN module, power control module, LCD display module powers on;

(4) initialization of peripherals and the setting of state thereof, comprises and arranges current detection module, LCD MODULE, whole group of voltage and insulating property measurement module, thermal management module, clock module and memory module and acquisition module;

(5) read memory module, obtain SOC, SOE required for described MCU module and estimate the general and OBD diagnosis content of arteries and veins, and obtain whole electric battery SOC and SOE initial value SOC _init, SOE _init, total electric battery whole group of maximum available Q _max, each cell monomer maximum available capacity Q _imax, time of repose t, leaves standstill and refers to when battery set charge/discharge current absolute value is less than 50mA;

(6) read clock module, obtain system clock;

(7) under the setting of clock module, every 10 milliseconds of conversions once, by obtaining whole assembled battery total voltage value with the channel attached whole group of voltage of Three S's PI and insulating property measurement module, obtain battery set charge/discharge current value by the current detection module be connected with an A/D ALT-CH alternate channel;

(8) when detecting insulation resistance, adopt in a stationary situation, 500 milliseconds are detected once, primary insulation within 1 second, is asked to estimate resistance value, when first 500 milliseconds time, when the control signal CELL0_EN from MCU module is effective, first optical coupled switch closes, the voltage of whole electric battery is added in whole resistance measurement network, and wherein VGND is bonding ground on automobile, and Insulation monitoring mainly measures the whole Battery pack positive pole of power and the negative pole resistance R to bonding ground _high-gndand R _low-gnd.Measuring process is as follows:

Time control signal CLONE from MCU module is invalid, the second optical coupled switch is opened, and the 87 resistance R87 is incorporated to resistor network, at this time, is measured the voltage V at the 91 resistance R91 two ends by ASD7844 _r91, from the control signal CLONE of MCU module is effective time, the second optical coupled switch closes, the 87 resistance R87 short circuit from resistor network, at this time, is measured the V at R91 two ends by ASD7844 _r91 ¹voltage, according to circuit theory, obtains equation:

V _R91/V _R91 ¹＝R88+R _high-gnd/R87+R88+R _high-gnd；

In like manner, time the control signal CLTOW from MCU module is invalid, the 3rd optical coupled switch is opened, and the 87 resistance R87 is incorporated to resistor network, at this time, is measured the voltage V at the 92 resistance R92 two ends by ASD7844 _r92, time the control signal CLTOW from MCU module is effective, the 3rd optical coupled switch closes, the 87 resistance R87 short circuit from resistor network, at this time, is measured the voltage V at the 92 resistance R92 two ends by ASD7844 _r92 ¹, according to circuit theory, obtain equation:

V _R92/V _R92 ¹＝R94+R _low-gnd/R93+R94+R _low-gnd；

Solve R thus _high-gndand R _low-gnd;

(8) whether first via CAN passage receives data, if the data of receiving, then classification process data, first via CAN passage receives at most the data of 4 sub-acquisition systems, every sub-acquisition system have maximum 12 road monomer voltages, 8 tunnel temperature, whole group of voltage and half group of voltage and 6802 status information and warning message, otherwise, jump to (9);

Whether (9) second road CAN passages receive data, if the data of receiving, then classification process data, second road CAN passage receives at most the data of 4 sub-acquisition systems, every sub-acquisition system have maximum 12 road monomer voltages, 8 tunnel temperature, whole group of voltage and half group of voltage and 6802 status information and warning message, otherwise, jump to (10);

Whether (10) the 3rd road CAN passages receive data, if the data of receiving, then classification process data, CAN passage 3 receives at most the data of 4 sub-acquisition systems, every sub-acquisition system have maximum 12 road monomer voltages, 8 tunnel temperature, whole group of voltage and half group of voltage and 6802 status information and warning message, otherwise, jump to (11);

(11) estimate that power brick using state is as state-of-charge (StateOfCharge), referred to as SOC;

Gained SOC and S0C is once estimated upper _iNITampere-hour integration is carried out on basis, and formula is as follows:

$SOC={\mathrm{SOC}}_0-\frac{1}{C_E}\underset{0}{\overset{t}{\∫}}Idt;$

Wherein, SOC0=S0C _iNIT, I is power brick charging and discharging currents, and during electric discharge, current value gets negative value, and during charging, current value is got on the occasion of, CE=Q _mAX;

(12) arteries and veins general estimation SOE (StateOfHealth) is estimated according to SOE;

(13) the 4th road CAN passage and MCU module is driven to carry out alternately;

(14) according to the temperature gathered, voltage, current information, heat management, power management, safety management etc. are carried out to battery charge and discharge process;

(15) diagnose for the data of battery charge and discharge process and operating mode, record trouble code also takes countermeasure;

(16) storage battery bag discharge and recharge data and OBD diagnostic message;

(17) start serial ports, the information such as voltage, electric current, SOC and warning are delivered to touch-screen display;

(18) if press prosthetic charge button in system charging process, system starts prosthetic charge function and controls charging process, thus realizes the correction to power brick state-of-charge SOC, and charging process is as follows:

A) Systematical control battery standing more than 2 hours, gathers each cell terminal voltage, obtains each cell SOCiint by looking into SOC-OCV table;

B) charging is carried out to battery and put charging by voltage, or ensure that charge volume is greater than 1/2nd of power brick capacity, obtain charge volume Δ AH by ampere-hour integral and calculating _fill;

C) leaving standstill more than 2 hours, gather each cell terminal voltage, obtaining each cell SOCiend by looking into SOC-OCV table;

D) according to above-mentioned data, the SOC result that current integration in battery charge and discharge process calculates gained is revised.

(19) if system at rest detected after system charging complete, namely charging current is less than 50mA, and electric battery carries out equalization discharge, and hardware implementing is realized by acquisition module, software controlling strategies is realized by master control system, and balanced end condition is that each monomer battery voltage difference is less than 0.05V.

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 (9)

1. one kind is applicable to the battery management main system of new-energy automobile, it is characterized in that: comprise MCU module, power management module, current detection module, LCD MODULE, whole group of voltage and insulating property measurement module, thermal management module, clock module and memory module, described MCU module is connected with described power management module, described power management module is described current detection module, described LCD MODULE, described whole group of voltage and insulating property measurement module, described thermal management module, described clock module and described memory module are powered, described current detection module is connected to an A/D ALT-CH alternate channel of described MCU module, described thermal management module is connected to the 2nd A/D ALT-CH alternate channel of described MCU module, described memory module is connected to a SPI passage of described MCU module, described clock module is connected to the 2nd SPI passage of described MCU module, described whole group of voltage and insulating property measurement module are connected to the Three S's PI passage of described MCU module, described LCD MODULE is connected to the RS232 communication port of described MCU module, described MCU module is also provided with multichannel CAN passage, each connected in series respectively on CAN passage described in first three road of described MCU module have 4 acquisition modules.

2. the battery management main system being applicable to new-energy automobile according to claim 1, it is characterized in that: described MCU module is XC2287 chip, described MCU module is provided with five road CAN passages, the electronic equipments such as the external entire car controller of CAN passage, charging set described in the 4th tunnel and OBD demarcate, and described in the 5th tunnel, CAN passage is as reserved passageway.

3. the battery management main system being applicable to new-energy automobile according to claim 1, is characterized in that: described power management module comprises power supply EMI filter circuit and low-power consumption treatment circuit, described power supply EMI filter circuit comprises electromagnetic interface filter (L1), first diode (VD1), second diode (VD2), first resistance (R1), first electric capacity (C1), second electric capacity (C2) and the 3rd electric capacity (C3), automobile batteries power supply directly accesses the positive pole of described first diode (VD1), negative pole through described first diode (VD1) outputs to the input end of described electromagnetic interface filter (L1), and be connected to described second diode (VD2) between the input end of described electromagnetic interface filter (L1), described first resistance (R1) and described first electric capacity (C1), described second electric capacity (C2) and described 3rd electric capacity (C3) is connected between the output terminal of described electromagnetic interface filter (L1), described low-power consumption treatment circuit comprises voltage conversion circuit and output control circuit, described voltage conversion circuit comprises voltage conversion chip (NCV4274), self-recoverage diode (FI), 4th electric capacity (C4), 5th electric capacity (C5) and the 6th electric capacity (C6), voltage after described power supply EMI filter circuit filtering process is connected to described self-recoverage diode (FI), the input end of described voltage conversion chip (NCV4274) is accessed through described self-recoverage diode (FI), and be connected to described 4th electric capacity (C4) and described 5th electric capacity (C5) between the input end of described self-recoverage diode (FI) and described voltage conversion chip (NCV4274), the output terminal of described voltage conversion chip (NCV4274) is connected to described 6th electric capacity (C6), described output control circuit comprises MOSEFT pipe (VT1), 2nd MOSEFT pipe (VT2), 3rd MOSEFT pipe (VT3), 4th resistance (R4), 5th resistance (R5), 6th resistance (R6), 7th resistance (R7), 8th resistance (R8) and the 9th resistance (R9), control signal+the 12V_EN of described MCU accesses the grid of described 2nd MOSEFT pipe (VT2) through described 6th resistance (R6), and be connected with described 7th resistance (R7) between the grid of described 2nd MOSEFT pipe (VT2) and ground, 12V voltage+12VOUT after described power supply EMI filter circuit filtering process is connected to a described MOSEFT and manages (VT1) source electrode, be connected to a MOSEFT through described 4th resistance R4 simultaneously and manage (VT1) grid, a described MOSEFT manages (VT1) grid and manages (VT2) pole that drains through the 5th resistance (R5) and described 2nd MOSEFT and be connected, control signal+the 12V_EN of described MCU control described 2nd MOSEFT pipe (VT2) by and conducting, decision is loaded into the voltage that a described MOSEFT manages (VT1) grid, and then control the output+12VP of described MOSEFT pipe (VT1), low-voltage+the 5V exported through described stabilized voltage supply voltage conversion chip (NCV4274) accesses the source electrode that described 3rd MOSEFT manages (VT3), and the grid of described 3rd MOSEFT pipe (VT3) is connected to through described 9th resistance (R9), control signal+the 5V_EN of described MCU accesses the grid of described 3rd MOSEFT pipe (VT3) through described 8th resistance (R8), in order to control cut-off and the conducting of described 3rd MOSEFT pipe (VT3), control power supply+5VP to export, described power management module is by the 12V voltage+12VOUT after described power supply EMI filter circuit filtering process, manage (VT1) and described 2nd MOSEFT by a described MOSEFT to manage the cut-off of (VT2) and conducting and control to export and power to described current detection module, described LCD MODULE and described thermal management module, the 5V voltage that described power management module will transform through described voltage conversion circuit, manages the cut-off of (VT3) and conducting by described 3rd MOSEFT and controls to export+5VP and power to described MCU module, described whole group of voltage and insulating property measurement module, described clock module and described memory module.

4. the battery management main system being applicable to new-energy automobile according to claim 1, is characterized in that: described current detection module comprises reference power source circuit and current detection circuit, described reference power source circuit comprises the 11 electric capacity (C11), 13 resistance (R13), TL431B, 14 resistance (R14), 15 resistance (R15), 12 electric capacity (C12), 13 electric capacity (C13) and the 14 electric capacity (C14), the filtering circuit that 12V voltage+12VOUT described 11 electric capacity (C11) of access after the filtering of described power supply EMI filter circuit and described low-power consumption processing circuit processes and described 13 resistance (R13) form, be input to the input end of described TL431B, the output terminal of described TL431B also connects described 14 resistance (R14) and described 15 resistance (R15), the two ends of output voltage are also connected to described 13 electric capacity (C13) and described 14 electric capacity (C14), described current detection circuit comprises the 80 resistance (R80), the 81 resistance (R81), the 82 resistance (R82), the 83 resistance (R83), the 48 electric capacity (C48), the 49 electric capacity (C49), the 50 electric capacity (C50) and the 51 electric capacity (C51), and resistance and capacitance group synthesize four RC wave filters.

5. the battery management main system being applicable to new-energy automobile according to claim 1, is characterized in that: described LCD MODULE comprises Liquid Crystal Module power converting circuit and RS232 telecommunication circuit; Described Liquid Crystal Module power converting circuit comprises boost chip GS3362, triode (VT5), the tenth resistance (R10), the 11 resistance (R11), the 12 resistance (R12) and the 13 resistance (R13), 12V voltage+12VOUT after after described power supply EMI filter circuit filtering process and described low-power consumption treatment circuit accesses the collector of described triode (VT5), be input to the input end of described boost chip GS3362, the output terminal of described boost chip GS3362 exports the voltage after boosting; Described RS232 telecommunication circuit comprises MAX2232 chip and peripheral circuit thereof for the Transistor-Transistor Logic level of standard being converted to RS232 level.

6. the battery management main system being applicable to new-energy automobile according to claim 1, is characterized in that: described whole group of voltage and insulating property measurement module comprise total voltage metering circuit and insulating property metering circuit, described total voltage metering circuit comprises DCDC isolation, 70 electric capacity (C70), 71 electric capacity (C71), 72 electric capacity (C72), 73 electric capacity (C73), 89 resistance (R89), 90 resistance (R90), digital isolator ADUM1401 and A/D acquisition chip ADS7844, potential-divider network is formed after described 89 resistance (R89) and described 90 resistance (R90) serial connection, power brick voltage after dividing potential drop inputs described A/D acquisition chip ADS7844, the output terminal of described A/D acquisition chip ADS7844 exports collection by SPI communication interface and is worth to described MCU module, described insulating property metering circuit comprises for controlling the photoelectrical coupler (N27, N28), the 87 resistance (R87) that are incorporated to and disconnect, the 88 resistance (R88), the 91 resistance (R91), the 92 resistance (R92), the 93 resistance (R93) and the 94 resistance (R94).

7. the battery management main system being applicable to new-energy automobile according to claim 1, it is characterized in that: described thermal management module comprises load driving circuits, described load driving circuits comprises power control chip BTS5235 and peripheral circuit thereof, the output quantity of the input end access amount control output end of described power control chip BTS5235, the output terminal access load of described power control chip BTS5235.

8. the battery management main system being applicable to new-energy automobile according to claim 1, it is characterized in that: described clock module is that described MCU module is provided with special hardware watchdog circuit, described hardware watchdog circuit, switch chip SP690 and N21 (74HC1) by automatic spare device battery to form, receive the VCC end of SP690A through the 5V power supply of described power module process, the 51 electric capacity (C51) receives the VCC of SP690A to power filter, the VDD that the output terminal VOUT of SP690A is connected to clock chip PCA21125 powers, the output terminal of 74HC1 is connected to the reset terminal of MCU, pwm control signal WATCH_DOG from described MCU module feeds dog to SP690A, SP690 carries hardware watchdog function, RST pin exports reset signal and holds to the INA of 74HC1, the input INB that the control pin DIS_W_DOG of MCU is connected to 74HC1 holds, 61 resistance (R61) is pull-up resistor, receive through between the 5V power supply of described power module process and the INB pin of 74HC1, 54 electric capacity (C54) is filter capacitor, receive between the VCC pin of 74HC1 and ground.62 resistance (R62) is pull down resistor, receives between the output pin OUTY of 74HC1 and ground.

9. be applicable to a control method for the battery management main system of new-energy automobile, it is characterized in that: comprise the following steps:

(1) start MCU module, switch gear to system electrification or insertion charging set plug by system electrification or ignition key switch;

(2) MCU module carries out variable-definition and initialization thereof;

(3) power management module is started, to described memory module, described clock module, isolation A/D modular converter, CAN module, power control module, LCD display module powers on;

(4) initialization of peripherals and the setting of state thereof, comprises and arranges current detection module, LCD MODULE, whole group of voltage and insulating property measurement module, thermal management module, clock module and memory module and acquisition module;

(5) read memory module, obtain SOC, SOE required for described MCU module and estimate the general and OBD diagnosis content of arteries and veins, and obtain whole electric battery SOC and SOE initial value SOC _init, SOE _init, total electric battery whole group of maximum available Q _max, each cell monomer maximum available capacity Q _imax, time of repose t, leaves standstill and refers to when battery set charge/discharge current absolute value is less than 50mA;

(6) read clock module, obtain system clock;

(7) under the setting of clock module, every 10 milliseconds of conversions once, by obtaining whole assembled battery total voltage value with the channel attached whole group of voltage of Three S's PI and insulating property measurement module, obtain battery set charge/discharge current value by the current detection module be connected with an A/D ALT-CH alternate channel;

(8) when detecting insulation resistance, adopt in a stationary situation, 500 milliseconds are detected once, primary insulation within 1 second, is asked to estimate resistance value, when first 500 milliseconds time, when the control signal CELL0_EN from MCU module is effective, first optical coupled switch closes, the voltage of whole electric battery is added in whole resistance measurement network, and wherein VGND is bonding ground on automobile, and Insulation monitoring mainly measures the whole Battery pack positive pole of power and the negative pole resistance R to bonding ground _high-gndand R _low-gnd.Measuring process is as follows:

Time control signal CLONE from MCU module is invalid, the second optical coupled switch is opened, and the 87 resistance (R87) is incorporated to resistor network, at this time, is measured the voltage V at the 91 resistance (R91) two ends by ASD7844 _r91, from the control signal CLONE of MCU module is effective time, the second optical coupled switch closes, the 87 resistance (R87) short circuit from resistor network, at this time, is measured the V at R91 two ends by ASD7844 _r91 ¹voltage, according to circuit theory, obtains equation:

V _R91/V _R91 ¹＝R88+R _high-gnd/R87+R88+R _high-gnd；

In like manner, time the control signal CLTOW from MCU module is invalid, the 3rd optical coupled switch is opened, and the 87 resistance (R87) is incorporated to resistor network, at this time, is measured the voltage V at the 92 resistance (R92) two ends by ASD7844 _r92, time the control signal CLTOW from MCU module is effective, the 3rd optical coupled switch closes, the 87 resistance (R87) short circuit from resistor network, at this time, is measured the voltage V at the 92 resistance (R92) two ends by ASD7844 _r92 ¹, according to circuit theory, obtain equation:

V _R92/V _R92 ¹＝R94+R _low-gnd/R93+R94+R _low-gnd；

Solve R thus _high-gndand R _low-gnd;

(8) whether first via CAN passage receives data, if the data of receiving, then classification process data, first via CAN passage receives at most the data of 4 sub-acquisition systems, every sub-acquisition system have maximum 12 road monomer voltages, 8 tunnel temperature, whole group of voltage and half group of voltage and 6802 status information and warning message, otherwise, jump to (9);

Whether (9) second road CAN passages receive data, if the data of receiving, then classification process data, second road CAN passage receives at most the data of 4 sub-acquisition systems, every sub-acquisition system have maximum 12 road monomer voltages, 8 tunnel temperature, whole group of voltage and half group of voltage and 6802 status information and warning message, otherwise, jump to (10);

Whether (10) the 3rd road CAN passages receive data, if the data of receiving, then classification process data, CAN passage 3 receives at most the data of 4 sub-acquisition systems, every sub-acquisition system have maximum 12 road monomer voltages, 8 tunnel temperature, whole group of voltage and half group of voltage and 6802 status information and warning message, otherwise, jump to (11);

(11) estimate that power brick using state is as state-of-charge (StateOfCharge), referred to as SOC;

Gained SOC and S0C is once estimated upper _iNITampere-hour integration is carried out on basis, and formula is as follows:

$SOC={\mathrm{SOC}}_0-\frac{1}{C_E}\underset{0}{\overset{t}{\∫}}Idt;$

Wherein, SOC0=S0C _iNIT, I is power brick charging and discharging currents, and during electric discharge, current value gets negative value, and during charging, current value is got on the occasion of, CE=Q _mAX;

(12) arteries and veins general estimation SOE (StateOfHealth) is estimated according to SOE;

(13) the 4th road CAN passage and MCU module is driven to carry out alternately;

(14) according to the temperature gathered, voltage, current information, heat management, power management, safety management etc. are carried out to battery charge and discharge process;

(15) diagnose for the data of battery charge and discharge process and operating mode, record trouble code also takes countermeasure;

(16) storage battery bag discharge and recharge data and OBD diagnostic message;

(17) start serial ports, the information such as voltage, electric current, SOC and warning are delivered to touch-screen display;

(18) if press prosthetic charge button in system charging process, system starts prosthetic charge function and controls charging process, thus realizes the correction to power brick state-of-charge SOC, and charging process is as follows:

A) Systematical control battery standing more than 2 hours, gathers each cell terminal voltage, obtains each cell SOCiint by looking into SOC-OCV table;

B) charging is carried out to battery and put charging by voltage, or ensure that charge volume is greater than 1/2nd of power brick capacity, obtain charge volume Δ AH by ampere-hour integral and calculating _fill;

C) leaving standstill more than 2 hours, gather each cell terminal voltage, obtaining each cell SOCiend by looking into SOC-OCV table;

D) according to above-mentioned data, the SOC result that current integration in battery charge and discharge process calculates gained is revised.

(19) if system at rest detected after system charging complete, namely charging current is less than 50mA, and electric battery carries out equalization discharge, and hardware implementing is realized by acquisition module, software controlling strategies is realized by master control system, and balanced end condition is that each monomer battery voltage difference is less than 0.05V.