CN2890947Y - Power battery management system for hybrid electric vehicle - Google Patents

Abstract

The utility model provides a management system of a dynamic battery set for mix vehicle, which comprises two branch systems of a collection circuit board and a host control circuit board, wherein a single-group battery voltage collection module, a battery total voltage/ total current collection module of the collection circuit board connects with an I/O opening of the host control chip through a multi-circuit switching switch and an A/D transformation chip. The collection circuit board communicates with the host control circuit board through a CAN bus communication module, and an address interface of a non-easy losing data storage module of the control circuit board connects with the I/O opening of the host control chip CPU. A reading interface and a writing interface respectively connect with the reading interface and the writing interface of the host control chip CPU, and the I/O opening of the host control chip CPU respectively connects with a heavy current protection module, a temperature control module and an output terminal (CA) of a fault alarming module optical coupler. The utility model can promote the precision and speed of voltage collection of the system, the stability of data transmission in complex real operation mode of the whole vehicle, and the precision of single-group battery voltage collection and the anti-interference performance of the voltage collection process.

Description

A kind of management system of Hybrid Vehicle power battery pack

Technical field

The utility model belongs to the automotive electronics applied technical field, is specifically related to the battery management technology of automobile.

Background technology

The a plurality of secondary battery that are used on the mixed power electric car are crucial control assemblies of hybrid vehicle system; at their experience high-pressure series and repeatedly filling; put all after dates; the imbalance of these electric battery between all may the appearance group; this will influence the power supply of electric automobile greatly; and the work efficiency and the serviceable life that influence these secondary battery; the electric weight of total system is reduced; therefore; to detect each battery operation state and performance quality in the electric battery in working order in real time; comprise single Battery pack voltage; assembled battery total voltage; battery temperature; the battery charging and discharging electric current; battery capacity etc.; to master control circuit board content that dynamic report detects; accept the countermeasure instruction that master control circuit board is beamed back simultaneously, whether will carry out balance electric battery; a series of battery management work such as protection.In prior art, mostly the balance aspect of seeing Chinese patent 91107576.3,200310111783.2,02136609.8,95191121.X, 200310111599.8,02127613.7,200410013807.5,02129322.8 battery is based on the series connection form, this balance method time is long, working current is little, also will solve stationary problem and cross problems such as height with relative cell voltage; Mostly the voltage acquisition aspect of single Battery pack is with the timesharing of CPLD FPGA (Field Programmable Gate Array) the electrode potential of every Battery pack to be gathered, get the terminal voltage of the potential difference (PD) at positive and negative the two poles of the earth by program then as this Battery pack, but want several milliseconds at interval in to the potential acquisition process at the positive and negative the two poles of the earth of every Battery pack, this has more greatly may exist certain error to the terminal voltage of counting cell; Precision to current acquisition aspect current acquisition is not high, and this causes the estimation out of true of the state-of-charge (SOC) to battery; Adopt Single Wire Bus Technology, serial communication technology etc. between internal system aspect the information communication of (collection plate and master control board), this causes the antijamming capability of total system in the car load actual condition not strong more.

Summary of the invention

The purpose of this utility model is for overcoming the weak point of prior art, design a kind of management system of Hybrid Vehicle power battery pack, the voltage acquisition precision and the speed of raising system, the stability that data send in the actual condition of car load complexity, and the anti-interference in single Battery pack voltage acquisition precision and the voltage acquisition process.

The management system of the hybrid vehicle power battery pack that the utility model proposes is made of collecting circuit board and master control circuit board two big subsystems.

Collecting circuit board: mainly comprise main control chip CPU, single Battery pack voltage acquisition module, battery total voltage/total current acquisition module, battery temperature acquisition module, battery balanced module and CAN bus communication module.Single Battery pack voltage, assembled battery total voltage and the total current that wherein single Battery pack voltage acquisition module, battery total voltage/total current acquisition module will collect by behind multicircuit switch, the A/D conversion chip, is connected with the I/O mouth of main control chip CPU respectively; Main control chip CPU on the collecting circuit board is connected with CAN bus communication module on the master control circuit board by the CAN bus communication module, connects by RS232 serial communication module PC in addition.

Control circuit board: mainly comprise the CAN bus communication module that is connected with entire car controller with collecting circuit board, the RS232 serial communication module, non-volatile data storage module, forceful electric power protection module, temperature control modules, fault alarm module and the main control chip CPU that are connected with PC.Wherein the address port of non-volatile data storage module is connected with the I/O mouth of main control chip CPU respectively with FPDP; the reading and writing port is connected with the reading and writing port of main control chip CPU respectively, and the I/O port of main control chip CPU connects the input end (CA) of forceful electric power protection module, temperature control modules, fault alarm module optocoupler respectively.

In the collecting circuit board system: for single Battery pack is carried out voltage sample, the utility model is earlier to single Battery pack process precision resistance dividing potential drop, the front and back that isolate through linear optical coupling LOC110 all dispose an operational amplifier again, its objective is the linearity and the anti-interference that improve voltage acquisition.For assembled battery total voltage is sampled, it is the Hall voltage sensor of CHV-25P that the utility model adopts model, and this sensor acquisition precision height, good stability satisfy the measurement range of native system total voltage.For battery pack current is sampled, it is the Hall current sensor of CHB-200SF that the utility model patent adopts model, consider that the precision of current acquisition directly has influence on the computational accuracy of battery charge state SOC, so the time through mould/number conversion, the utility model patent has adopted outer 16 the A/D conversion chip ADS8320 of CPU sheet, thereby has further improved the sampling precision of electric current; For the temperature to battery is sampled, it is the digital temperature sensor of DS18B20 that the utility model patent adopts model, this sensor measurement scope, precision etc. meet the native system measurement requirement, adopted the forms data line of A/D in the sheet in addition, the temperature data that sends can directly be sent into the I/O mouth of the main control chip CPU of collecting circuit board; With the transmission of master control circuit board CPU, reception process in, the utility model patent adopts the CAN bussing technique and by the 6N137 light-coupled isolation, its objective is that the CAN bus has characteristics such as data transfer rate is fast, antijamming capability is strong.

In the master control circuit board system: except with the CAN bus functionality of collecting circuit board communication, to aspects such as some important historical datas of battery (as: the SOC record after system's power down) storages, the utility model has adopted nonvolatile memory.If the power down time is not long, the SOC value before the power down is directly called by system, if the power down time is long, the power down time span that system writes down by DS1644 and the self-discharge rate of the battery SOC value before to power down is carried out certain compensation; Aspect defencive function, forceful electric power protected location, temperature control unit and alarm unit etc. have been related to, the main task of forceful electric power protected location is when battery is in overvoltage, overcurrent, under-voltage, undercurrent in the charge and discharge process, and the I/O mouth of main control chip sends corresponding level signal and cuts off relay on the major loop; The main task of temperature control unit is when the temperature of tested battery is higher or lower than certain setting value, and the I/O mouth of main control chip sends corresponding level signal and opens or close fan in the cell panel; The main task of alarm unit is when battery is in abnomal condition, sends alerting signal; Aspect the PC communication, be, aspect data such as cell voltage, electric current, temperature and SOC are sent to are showing on the PC by the RS232 serial communication; With entire car controller HCU be by with the CAN bus communication module of collecting circuit board communication and connect a contact.

The major function of this system is to realize single Battery pack voltage monitoring, assembled battery total voltage monitoring, the battery charging and discharging current monitoring of power battery pack in the hybrid vehicle actual condition; The real-time estimation of battery charge state (SOC); To a series of forceful electric power protections such as battery overvoltage, overcurrent, under-voltage, undercurrent and report to the police; Temperature control function to battery; Equalization function to battery; With communication function of display device and entire car controller etc.

The utility model is simple in structure, easy to operate, compares with existing correlation technique, the utlity model has following advantage:

At first used multicircuit switch in gathering voltage, current module, enlarged the I/O mouth of main control chip CPU effectively, the I/O mouth quantitative requirement to main control chip CPU reduces the expansion of the selectable range of CPU like this.And the I/O by CPU sends chip selection signal and directly gathers single Battery pack voltage in the synchronization timesharing, has improved the precision and the speed of voltage acquisition;

Secondly the CAN bus mode has been adopted in the communication between collecting circuit board and master control circuit board, has improved the stability that data send in the actual condition of car load complexity like this;

In single Battery pack voltage acquisition module, precision resistance and linear optical coupling have been used at last, effective like this anti-interference that has improved in single Battery pack voltage acquisition precision and the voltage acquisition process.

Description of drawings

Fig. 1 is the Hybrid Vehicle power battery group management system global structure block diagram that the utility model proposes.

Fig. 2 is the acquisition principle figure of the single Battery pack of the Hybrid Vehicle power battery group management system that the utility model proposes (6/group) voltage.

Fig. 3 is the acquisition principle figure of Hybrid Vehicle power battery group management system battery group (120) total voltage that the utility model proposes.

Fig. 4 is the acquisition principle figure of the Hybrid Vehicle power battery group management system battery group total current that the utility model proposes.

Fig. 5 is the acquisition principle figure of the Hybrid Vehicle power battery group management system battery temperature acquisition that the utility model proposes.

Fig. 6 is the circuit catenation principle figure of the outer AD conversion chip of multicircuit switch ADG608 and 16 bit slices on the Hybrid Vehicle power battery group management system acquisition plate that the utility model proposes.

Fig. 7 is serial communication and a CAN communication interface schematic diagram on the Hybrid Vehicle power battery group management system acquisition plate that the utility model proposes.

Fig. 8 is the peripheral connection layout of CPU on the Hybrid Vehicle power battery group management system acquisition plate that the utility model proposes.

Fig. 9 is a supply module schematic diagram on the Hybrid Vehicle power battery group management system acquisition plate that the utility model proposes.

Figure 10 is serial communication and a CAN communication interface schematic diagram in the Hybrid Vehicle master control board that the utility model proposes.

Figure 11 a and Figure 11 b are the Hybrid Vehicle power battery group management system master system circuit board CPU peripheral circuit schematic diagram that the utility model proposes.

Figure 12 is a supply module schematic diagram in the Hybrid Vehicle power battery group management system master making sheet that the utility model proposes.

Figure 13 is the software flow pattern of the Hybrid Vehicle power battery group management system acquisition circuit board that the utility model proposes.

Figure 14 is the software flow pattern of the Hybrid Vehicle power battery group management system master system circuit board that the utility model proposes.

Embodiment

Below be that 6/group, electric battery are that the management of the Hybrid Vehicle power battery pack of 120 batteries is that example describes the utility model in detail with single Battery pack.

Fig. 1 gives out the general structure of management system, and it mainly is made of collecting circuit board and master control circuit board two large divisions.Collecting circuit board mainly be responsible for single Battery pack (6/group) monitoring of voltage, the monitoring of electric battery (120 batteries) total voltage, battery charging and discharging electric current detection, battery temperature detection and and master control circuit board between communication etc.Mainly comprise main control chip CPU, single Battery pack voltage acquisition module, battery total voltage/total current acquisition module, battery temperature acquisition module, battery balanced module and CAN bus communication module.Single Battery pack voltage, assembled battery total voltage and the total current that wherein single Battery pack voltage acquisition module, battery total voltage/total current acquisition module will collect by behind multicircuit switch, the A/D conversion chip, is connected with the I/O mouth of main control chip CPU respectively; Main control chip CPU on the collecting circuit board is connected with CAN bus communication module on the master control circuit board by the CAN bus communication module, connects by RS232 serial communication module PC in addition.

Battery correlation parameter (voltage, electric current, the temperature) digital quantity that master control circuit board mainly be responsible for to be accepted to gather from collecting circuit board, the estimation of SOC, with the communication of entire car controller and PC, non-easy loss ground storage battery historical data, battery charge and discharge process in forceful electric power protection, battery temperature control and battery failures early warning etc.Mainly comprise the CAN bus communication module that is connected with entire car controller with collecting circuit board, the RS232 serial communication module, non-volatile data storage module, forceful electric power protection module, temperature control modules, fault alarm module and the main control chip CPU that are connected with PC.Wherein the address port of non-volatile data storage module is connected with the I/O mouth of main control chip CPU respectively with FPDP; the reading and writing port is connected with the reading and writing port of main control chip CPU respectively, and the I/O port of main control chip CPU connects the input end (CA) of forceful electric power protection module, temperature control modules, fault alarm module optocoupler respectively.

One, be elaborated respectively below in conjunction with accompanying drawing each module to collecting circuit board:

1, single Battery pack (6/group) voltage acquisition module, its schematic diagram be as shown in Figure 2:

In the car load actual condition, define the upper and lower bound of assembled battery total voltage respectively: the following 96V of being limited to of regulation assembled battery total voltage; Be limited to 200V on the regulation assembled battery total voltage.Can calculate single Battery pack (6 s'/group) change in voltage scope so:

Lower limit:

The upper limit:

The operating voltage variation range that can be calculated single Battery pack (6/group) by formula (2-1), (2-2) changes between [6.5V～10V].In this BCM system, acquisition scheme to single Battery pack (6/group) voltage has adopted elder generation by precision resistance [6] dividing potential drop, be optocoupler linearity [4] the isolation amplification of LOC110 again through model, the benefit of doing like this is that antijamming capability is strong, sampling precision is high, because of considering that battery is not having to have certain self discharge between the operating period, if the voltage collection circuit of single Battery pack also forms a loop, can cause unnecessary loss this moment to the capacity of battery.So the switch relay [1] that model is HHC66G (4078) of in the voltage acquisition circuit of the single Battery pack in every road, connecting, the working power of each way switch relay [1] (12V) is provided by input general supply [26].When the entire cell management system is in off working state, impel switch relay [1] to disconnect by cutting off general supply [26], voltage collection circuit is formed open circuit; When the entire cell management system is in running order, impel switch relay [1] to connect by conducting general supply [26], make voltage collection circuit form the loop, thereby avoided the self discharge of battery in off working state effectively.Single Battery pack voltage by the precision resistance dividing potential drop after through operational amplifier LM258[3] (increasing the optocoupler linearity) back arrives linear optical coupling LOC110[4], pass through another operational amplifier LM258[5 again after coming out from optocoupler].Previous operational amplifier LM258[3 among the figure] with the output voltage of battery (auxilliary add a LM7805 three-terminal voltage-stabilizing [2]) power supply own, linear optical coupling LOC110[4] with a back operational amplifier LM258[5] by one independently+5V power supply [28] power supply.Being used for the precision resistance [6] of dividing potential drop and input, the output resistance [7] [8] before and after the optocoupler is calculated as follows:

Because with linear optical coupling LOC110[4] first operational amplifier LM258[3 of being connected] scope of input voltage is between [0V～2V], and the operating voltage range of relating to battery again is between [6.5V～10V].Therefore precision resistance [6] ratio that adopts is (4: 1), adopts 8K (2.4K and 5.6K) and 2K.The linear optical coupling LOC110[4 that native system adopts] input, output resistance [7] [8] there are following requirement:

V _IN＝I ₁gR ₁ (2-3)

I ₁＝K ₁gI _F (2-4)

$R_1=\frac{V_{\mathrm{IN}}}{K_{1}g{I}_F}---(2-5)$

In the formula:

V _IN---input voltage; I ₁---ancestral temple clothes photocurrent (input);

R ₁---input resistance; I _F---the LED drive current;

K ₁---I ₁With I _FRatio;

(2-5) can obtain input resistance by formula $R_{}$ ${}_1=\frac{V_{\mathrm{IN}}}{K_{1}g{I}_F}=\frac{2}{0.004g0.015}\mathrm{\Ω}=33.3\mathrm{K\Ω}$

(consult interrelated data V here _IN=2V, K ₁=0.004, I _F=15mA)

V _OUT＝I ₂gR ₂ (2-6)

I ₂＝I _FgK ₂ (2-7)

$R_2=\frac{V_{\mathrm{IN}}}{K_{2}g{I}_F}---(2-8)$

V _OUT---output voltage; I ₂---ancestral temple clothes photocurrent (output);

R ₂---output resistance; I _F---the LED drive current;

K ₂---I ₂With I _FRatio;

(2-8) can obtain output resistance by formula $R_{}$ ${}_2=\frac{V_{\mathrm{IN}}}{K_{2}g{I}_F}=\frac{4}{0.004g0.015}\mathrm{\Ω}=66.6\mathrm{K\Ω}$

(consult interrelated data V here _OUT=4V, K ₂=0.004, I _F=15mA)

Can obtain input voltage V by formula (2-3), (2-4), (2-5), (2-6), (2-7), (2-8) _INWith output voltage V _OUTBetween relation:

$V_{\mathrm{OUT}}=V_{\mathrm{IN}}\mathrm{gK}3g\frac{R_2}{R_1}---(2-9)$

(consult interrelated data here ${\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="Y20062011048000171.png,Y20062011048000181.png"\; state="\{\{state\}\}">K</figure-callout>}}_1={\mathrm{<figure-callout\; id="2"\; label="K"\; filenames="Y20062011048000171.png,Y20062011048000181.png"\; state="\{\{state\}\}">K</figure-callout>}}_2=0.004,{\mathrm{<figure-callout\; id="3"\; label="K"\; filenames="Y20062011048000171.png,Y20062011048000181.png"\; state="\{\{state\}\}">K</figure-callout>}}_3=\frac{K_2}{{\mathrm{<figure-callout\; id="1"\; label="K"\; filenames="Y20062011048000171.png,Y20062011048000181.png"\; state="\{\{state\}\}">K</figure-callout>}}_1}=1)$

[annotate: the ground of previous amplifier is for relatively; The ground of the amplifier in back is public ground]

2, electric battery (120) total voltage acquisition module, its circuit theory diagrams be as shown in Figure 3:

In the entire test, defined the upper and lower bound of assembled battery total voltage respectively: the following 130V of being limited to of regulation assembled battery total voltage (be that SOC is 0, battery can not drive the minimum voltage that motor rotates); Be limited to 200V (performance of battery determines) on the regulation assembled battery total voltage, therefore selecting model for use is Hall voltage sensor [10] the collection total voltage of CHV-25P.Its principle of work is: input, output all are the form of electric current, therefore will be converted into voltage form to electric current by precision resistance [9] [11]., the important technological parameters such as the following table of CHV-25P Hall voltage sensor [10]:

I NRated current (input) (mA)	I PMeasurement range (mA)	I MMeasure electric current (output) (mA)	V CSupply voltage (V)	The L linearity (%)	X precision (T a＝+25 ℃)	T aWorking temperature (℃)	T rReaction time (us)
								10	0～±14m A	25	±12～± 15(5％)	0.1％	I N± 1.0%	0℃～70℃	10

The explanation of each pin of CHV-25P Hall voltage sensor [10]:

+ HT: input current just-HT: input current is negative+: positive supply

M: output terminal-: negative supply

Determining of input, output resistance:

According to battery operated ceiling voltage U _Max200V calculates as the input voltage of CHV-25P Hall voltage sensor [10], and regulation is sent A/D the voltage U of conversion _ADBe 5V, so:

Input resistance: ${\mathrm{<figure-callout\; id="1"\; label="R"\; filenames="Y20062011048000171.png,Y20062011048000181.png"\; state="\{\{state\}\}">R</figure-callout>}}_1=\frac{U_{\max }}{I_N}=\frac{200}{0.01}\mathrm{\&Omega;}=20\mathrm{K\&Omega;}---(2-10)$

Output resistance: ${\mathrm{<figure-callout\; id="2"\; label="R"\; filenames="Y20062011048000171.png,Y20062011048000181.png"\; state="\{\{state\}\}">R</figure-callout>}}_2=\frac{U_{\mathrm{AD}}}{I_M}=\frac{5}{0.025}\mathrm{\&Omega;}=200\mathrm{\&Omega;}---(2-11)$

3, the acquisition module of electric battery total current, its circuit theory diagrams be as shown in Figure 4:

Battery is in the car load actual condition, and the variation range of electric current is between [0A～200A].The precision of considering current acquisition in the BCM system is very big to battery charge state (SOC) influence, so adopt precision higher in the native system, model is the Hall current sensor [12] of CHB-200SF.The important technological parameters such as the following table of CHB-200SF Hall current sensor [12]:

Rated current I N (A)	Output current I M(mA)	Power supply V C (V)	Precision X (%) T a＝25℃	Linearity L (%)	Reaction time T r(us)	Power range V C(v)	Working temperature (℃)
								200	100	±12～18	I NError ± 0.5%～1.0 %	0.1	＜1us	Nominal power supply (V C) ± 5%	-40～85℃

Being described as follows of CHB-200SF Hall current sensor [12] each pin:

---power supply just for power-Data---data output pin+15V---for-15V

Determining of output resistance [13]:

As can be seen from Figure 4, this current sensor power supply [26] is to adopt two 12V, and current forms is adopted in data output, therefore needs with precision resistance [13] current forms to be converted into voltage form.And the resistance of connecting is 150 ohm a adjustable potentiometer [14].This is external to carry out inserting an operational amplifier LM258[15 before the A/D conversion] can strengthen the linearity of collection.According to battery operated maximum current I _Max=200A calculates as the input current of current sensor, and regulation is sent A/D the voltage U of conversion _ADBe 5V, so:

Output resistance: $R=\frac{U_{\mathrm{AD}}}{I_M}=\frac{5}{0.1}\mathrm{\&Omega;}=50\mathrm{\&Omega;}---(2-12)$

4, battery temperature acquisition module, its schematic diagram be as shown in Figure 5:

What this battery management system adopted is the DS18B20 digital temperature sensor [16] that U.S. DALLAS company produces, (needing to use a plurality of temperature sensors) when the test battery temperature will carry out drawing on the resistance [17] to digital line, the mode that can merge the ground wire of each DS18B20 digital temperature sensor [16] (pin 1), data line (pin 2), power lead (pin 3) respectively (promptly 6 DS18B20 digital temperature sensors [16] adopt 3 buses---ground wire, data line, power lead).This temperature sensor [16] has following characteristics:

● temperature measurement range :-55 ℃～+ 125 ℃;

● measuring accuracy: 0.5 ℃;

● 9 megadyne temperature number of degrees word output quantities;

● temperature to the switching time of digital quantity be 200ms;

● have A/D conversion in the sheet.

5, serial communication and CAN communication interface schematic diagram, as shown in Figure 7:

This collection plate adopts CAN bus and master control borad to carry out data and sends out/send, and can improve the speed and the stability of exchanges data like this; Adopt RS232 serial ports and upper machine communication, the state to battery shows in real time.CAN bus and RS232 serial ports will be isolated with 6N137 optocoupler [24].

RS232 serial ports connector lug adopts general 9 needle sockets [21] and main control chip CPU[25] a MAX232 level transferring chip [20] is arranged between (PIC18F458 single-chip microcomputer), because main control chip CPU[25] input, output level be Transistor-Transistor Logic level, and the PC configuration is the rs-232 standard serial line interface, the two electrical code is inconsistent, finish PC and main control chip CPU[25] serial data communication, must carry out level conversion.

What CAN bus interface the end of a thread adopted in the native system is general 9 needle sockets [23], and what impact damper adopted is that the model that PHILIPS company produces is PCA82C250 chip [22].It is with main control chip CPU[25] the Transistor-Transistor Logic level of CAN controller output pin be transformed to differential signal on the CAN bus.

6, the peripheral interface circuit figure of collection plate main control chip CPU, as shown in Figure 8:

The PIC18F458 single-chip microcomputer that the collection plate main control chip adopts little core company (Microchip) to produce is with 8 tunnel 10 A/D conversions in this single-chip microcomputer sheet.Because single group voltage acquisition (20 tunnel), total voltage collection (1 tunnel), total current collection (1 tunnel) in the present embodiment, so cause A/D ALT-CH alternate channel number and precision not enough, so the employing model is the multi-way switch [18] of ADG608 and 16 high-precision A/D conversion chip [19] that model is ADS8320 in the native system.16 high-precision A/D conversion chips [19] can also improve the conversion accuracy behind the current acquisition in addition, thereby improve the estimation precision of SOC.The peripheral circuit of multi-way switch and A/D conversion chip as shown in Figure 6.

PIC18F458 single-chip microcomputer principal feature is as follows:

● up to the program storage of 2MB, the data-carrier store of 4KB, the execution speed of 10MIPS;

● 16 bit wide instructions, 8 bit wide data channel, DC～40MHz clock, the active crystal oscillator of 4～10MHz band PLL phaselocked loop/clock input;

● 3 external interrupt pins, 4 timers, 2 kinds of oscillator clocks are selected;

● seizure/comparison/width modulation (PWM) is module (CCP), and enhancement mode CCP module has all characteristics of standard CC P module;

● the main synchronous serial communication (MSSP) of 2 kinds of working methods is arranged, addressable USART module;

● 10, the mould/number conversion module (A/D) of 8 passages, simulation comparison module;

● band CAN bus module;

● electrify restoration circuit (POR), the back off timer that powers on (PWRT) and oscillator starting of oscillation timer, the watchdog timer (WDT) of RC oscillator in the strap, the programmable code protection can be carried out online serial programming (ICSP) by 2 pins, dormancy (SLEEP) power saving mode;

● low-power consumption, high speed enhancement mode FLASH technology.

7, collection plate supply module, its circuit diagram schematic diagram be as shown in Figure 9:

The power supply that is used in this battery management system (BCM) collection plate has (± 12V ,+5V, U _AD[reference voltage]).Therefore consider in native system, to use two three-terminal voltage-stabilizing LM7805[28] [29] (be output as+5V), an accurate reference power supply [27] (is output as U _AD[reference voltage]), output changes into voltage form with precision resistance [30].Wherein, system's general supply [26] is to two 12 voltage sensors [10] power supplies, system (GND) as digitally with the output terminal on simulation ground, two three-terminal voltage-stabilizing LM7805[28] [29] respectively as digital power and analog power.

Two, following each functional module set accompanying drawing to master control circuit board is elaborated: CPU selected in the master control board still is the PIC18F458 single-chip microcomputer.

1, the serial communication of master control circuit board and CAN communication interface circuit are referring to Figure 10.

With the entire car controller communication module: by the CAN bus parameter relevant with battery status sent to entire car controller, entire car controller also sends to relevant command signal the main control chip CPU[37 of master control circuit board by the CAN bus simultaneously], and by 6N137 light-coupled isolation [35].It is PCA82C250T chip [33] and 9 pin general-purpose interfaces [34] that CAN impact damper of the present utility model adopts model.

With the PC communication module: the mode by serial communication sends to the parameter relevant with battery status on the PC with relevant acquisition software.RS232 serial ports that the utility model adopts and the level transferring chip [31] between the CPU are MAX232, and the interface that is connected with PC adopts 9 pin general-purpose interfaces [32].

Battery historical data storage module: the nonvolatile memory NVRAM[36 that native system adopts] be the DS1644 that U.S. DALLAS company produces, the integrated 32kx8RAM of this memory inside, real-time clock, lithium ion battery.The DS1644 data holding time can reach 10 years, the parallel data form that adopts data line and address wire to separate, access speed is fast, suitable with the read or write speed of the RAM of outside expansion, can be used for preserving the battery status data of a period of time, also can preserve important battery data, provide foundation for analyzing the battery charging and discharging state.Its concrete extended method is: 15 address wire pins and 8 data wire pins are connected respectively to main control chip CPUCPU[37] each I/O mouth, read/write signal pin and chip selection signal pin are connected respectively to main control chip CPU[37] read/write signal pin and chip selection signal pin.

Battery temperature control module, alarm unit all adopt main control chip CPU[37] the I/O mouth to send high/low level signal form be after TLP121 optocoupler [38] is isolated through model, be switch relay [39] the control fan [41] and alarm [40] of HHC66G (4078) by model.

The forceful electric power protected location adopts the main control chip CPU[37 of master control circuit board] the I/O mouth to send high/low level signal form be after TLP121 optocoupler [35] is isolated, directly to control the total relay in electric battery charge and discharge loop, referring to Figure 11 a and Figure 11 b through model.

The selected scheme of the supply module of master control circuit board is: select for use two LM7805 three-terminal voltage-stabilizings [43] [44] respectively as the digital power and the analog power of master control circuit board, the ground of total system is divided into digitally and simulation ground, the primary power of total system is an external pair of 12V direct supply [42], it can be for fan and relay power supply, referring to Figure 12.

The software flow pattern of collecting circuit board of the present utility model as shown in figure 13, at first each subroutine is carried out corresponding initialization, again the I/O mouth of gathering battery current, voltage and temperature is defined respectively, judge successively then whether the scope of the voltage U that collects, electric current I, temperature T satisfies the defined requirement.If the voltage of battery, electric current do not meet the demands, then the CPU on the collection plate uploads to the coherent signal that collects CPU in the master control board and passes through the 6N137 light-coupled isolation by the CAN bus, send corresponding level signal by corresponding I/O mouth then and cut off relay on the major loop, and send alerting signal; If battery is too high or too low for temperature, then the corresponding I/O mouth of CPU sends corresponding level signal and opens or close fan.At cell voltage, electric current, temperature is up to specification when requiring, read each data and upload to the CAN bus of collecting circuit board, for data are got ready to the transmission of master control circuit board.

The software flow pattern of master control circuit board of the present utility model at first behind the system boot power-up initializing, is accepted from the battery related data on the CAN bus that is connected with collecting circuit board as shown in figure 14; Judge battery related data whether reach capacity position and alert locations then successively, if reach capacity position and alert locations then take appropriate measures; Next the running status (as: charging and discharging currents of battery, voltage, temperature etc.) that shows battery estimates SOC and demonstration according to relevant algorithm again; At last data are done packing and handle, the related data of battery is delivered to CAN bus that is connected with entire car controller (HCU) and the RS232 serial ports that is connected with PC respectively.

Claims (5)

1, a kind of management system of Hybrid Vehicle power battery pack is made of collecting circuit board and master control circuit board two big subsystems, it is characterized in that:

Collecting circuit board includes main control chip CPU, single Battery pack voltage acquisition module, battery total voltage/total current acquisition module, battery temperature acquisition module and communication module, single Battery pack voltage, assembled battery total voltage and the total current that wherein single Battery pack voltage acquisition module, battery total voltage/total current acquisition module will collect by behind multicircuit switch, the A/D conversion chip, is connected with the I/O mouth of main control chip CPU respectively; The main control chip CPU on the collecting circuit board and the main control chip CPU of master control circuit board carry out communication, and collecting circuit board is connected with PC by RS232 serial communication module in addition;

Master control circuit board includes the CAN bus communication module that is connected with entire car controller, the RS232 serial communication module, non-volatile data storage module, forceful electric power protection module, temperature control modules, fault alarm module and the main control chip CPU that are connected with PC; Wherein the address port of non-volatile data storage module is connected with the I/O mouth of main control chip CPU respectively with FPDP; the reading and writing port is connected with the reading and writing port of main control chip CPU respectively, and the I/O port of main control chip CPU connects the input end CA of forceful electric power protection module, temperature control modules, fault alarm module optocoupler respectively.

2, the management system of Hybrid Vehicle power battery pack according to claim 1 is characterized in that: the communication module on the collecting circuit board adopts the CAN bus communication module, is connected with the CAN bus communication module of master control circuit board.

3, the management system of Hybrid Vehicle power battery pack according to claim 2, it is characterized in that: in the collecting circuit board, be provided with optocoupler and isolate at CAN bus communication module data reading and writing end and the input of RS232 serial communication module data, output terminal.

4, the management system of Hybrid Vehicle power battery pack according to claim 1, it is characterized in that: in the single Battery pack voltage acquisition module in collecting circuit board, the positive and negative two ends of single Battery pack are provided with precision resistance and carry out dividing potential drop, and be connected with a linear optical coupling, signal is isolated amplification.

5, the management system of Hybrid Vehicle power battery pack according to claim 4 is characterized in that: also connect in the front and back of linear optical coupling and used operational amplifier.

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