CN107390571A - A kind of batteries of electric automobile packet system and its measure voltage ＆ current method - Google Patents
A kind of batteries of electric automobile packet system and its measure voltage ＆ current method Download PDFInfo
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- CN107390571A CN107390571A CN201710465619.3A CN201710465619A CN107390571A CN 107390571 A CN107390571 A CN 107390571A CN 201710465619 A CN201710465619 A CN 201710465619A CN 107390571 A CN107390571 A CN 107390571A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- Automation & Control Theory (AREA)
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a kind of batteries of electric automobile packet system and its measure voltage ＆ current method, belong to automotive electronics application field, battery pack system includes battery management system and battery pack, battery management system gathers battery pack system parameter, battery pack system parameter includes battery bag total voltage, the positive and negative terminal voltage of fuse, the positive and negative terminal voltage of high voltage bus, bus current, each battery voltage and battery pack temperature；Battery management system carries out security diagnostics according to the voltage parameter of battery bag, closes contactor in order；Battery management system selects heat management mode according to the state of temperature of each battery pack, and request signal is sent to entire car controller.The present invention on the premise of guarantee is safe for operation, improves life-span and the course continuation mileage of battery bag by data acquisition, security diagnostics, heat management.
Description
Technical field
The invention belongs to automotive electronics application field, is related to a kind of batteries of electric automobile packet system and its measure voltage ＆ current
Method.
Background technology
Battery management system is the important tie for connecting vehicle mounted dynamic battery and electric automobile, the main work(of battery management system
Monitoring, the diagnosis that battery physical parameter can be included are divided into early warning, charge and discharge control, balanced and heat management, battery management system
Centralized battery management system and distributed battery management system, centralized battery management system gather all voltage x currents
Unit is all concentrated on mainboard, by the direct control relay controller of entire car controller, but centralized battery management system
Monomer sampling rat tail is long, and the inconsistency of wire harness length easily causes extra pressure drop, for different battery bags
Structure, centralized battery management system needs to use different configuration frames, i.e., poor for applicability；Distributed battery management system by
Master controller BMU and formed from controller CMU, strong applicability, beam distance uniformly, wire harness pressure drop it is uniform, but master controller
Microcontroller interface resource it is few, when from controller data collection break down when, loss of data can be caused.
The present invention based on the voltage of battery management system collection, electric current and temperature, enters to the data of collection in a distributed manner
Row security diagnostics, by the control to contactor and to cooling pump in battery management system, ensureing security and lifting electricity
On the premise of the performance in pond, extend its cycle life.
The content of the invention
It is an object of the invention to provide a kind of batteries of electric automobile packet system and its measure voltage ＆ current method, solves collection
The shortcomings that Chinese style battery management system is poor for applicability.
The technical scheme is that：
A kind of batteries of electric automobile packet system, battery pack system include battery management system and battery bag, the cell tube
Reason system includes master controller BMU and from controller CMU；The master controller BMU is by the first microcontroller, the second microcontroller
Device, first contactor unit, second contactor unit, Hall current sensor, isolated transceiver and high pressure sampling unit composition,
It is described to be made up of from controller CMU data acquisition unit, isolating transformer and current divider；
The battery bag is powered after being in series by n battery pack for vehicle power unit, and wherein n is odd number, in (n-
1)/2 serial fuse between a battery pack and (n+1)/2 battery pack, for protecting vehicle power unit；Battery bag positive terminal
Hall current sensor, first contactor unit are sequentially connected, negative pole end is sequentially connected current divider, second contactor unit, institute
First contactor unit second contactor unit is stated also to be connected with vehicle power unit respectively；
Each battery pack is in parallel with a data acquisition unit, using isolation transformation between each two data acquisition unit
Device carries out data transfer, to reduce signal interference；The I/O port of the data acquisition unit in parallel with battery pack 1 is connected point by rigid line
The inner terminal of device is flowed, for transmitting the voltage analog signal of collection；Data acquisition unit is changed analog signal by AD conversion
For data signal, the data acquisition unit in parallel with battery pack 1 is connected by isolating transformer with isolated transceiver, for sending
The data signal of voltage and temperature by AD conversion；The isolated transceiver is connected with the first microcontroller by rigid line, with
SPI mode sends data signal；First microcontroller and the second microcontroller, the second microcontroller and high pressure sampling are single
Member uses twisted pair line connection, and high pressure sampling unit collection high voltage analog signal, will through AD conversion in high pressure sampling unit
Data signal is sent to the second microcontroller, and the second microcontroller transmits the height of high pressure sampling unit collection to the first microcontroller
Press data signal；
First microcontroller with using CAN communication with entire car controller VCU, first microcontroller also with Hall
Current sensor is connected, using CAN communication using rigid line.
In such scheme, the first contactor unit is formed by leading positive contactor, preliminary filling contactor, preliminary filling resistance, institute
State and contactor is born based on second contactor unit.
In such scheme, the data acquisition unit uses Freescale MC33772 chips, the isolated transceiver
Model MC33664, Hall current sensor use LEM DHAB S/106, and current divider uses VISHAY WSBS8518, high pressure
Sampling unit uses TI ADS1148Q1 chips, and microcontroller uses MPC5744P.
In such scheme, the battery in the battery pack is lithium ion battery.
In such scheme, the battery management system gathers battery pack system parameter, and wherein battery pack system parameter includes
Battery bag total voltage, the positive and negative terminal voltage of fuse, the positive and negative terminal voltage of high voltage bus, bus current, each battery voltage with
And battery pack temperature；Wherein, bus refers to the connecting line of battery bag and vehicle power unit, and what is be connected with battery bag anode is high pressure
Bus anode, it is high voltage bus negative terminal to be connected with battery bag negative terminal, and the positive terminal voltage of high voltage bus is sampling connecting line 25 and ground connection
The pressure difference of connecting line 21, high voltage bus negative terminal voltage are pressure difference of the grounding connection line 21 with sampling connecting line 20.
In such scheme, battery bag total voltage, the positive and negative terminal voltage of fuse, the positive and negative terminal voltage of high voltage bus is by height
Pressure sampling unit samples to obtain, and each battery voltage and battery pack temperature parameter is to sample to obtain by data acquisition unit.
In such scheme, the sampling of bus current samples to obtain by Hall-type current sensor or current divider, and the
The bus current value that one microcontroller is preferentially calculated using current divider by voltage acquisition, when current divider voltage acquisition occurs
When failure, battery management system uses Hall-type current sensor to sample obtained bus current value.
In such scheme, if one of battery pack temperature is more than or equal to the threshold value T of setting1, then battery management system to
Entire car controller VCU sends cooling pump and opens request, if one of battery pack temperature is less than or equal to the threshold value T of setting2, then it is electric
Pond management system sends heat request to entire car controller VCU.
A kind of batteries of electric automobile packet system measure voltage ＆ current method, comprises the following steps：
Step 1), electricity on battery pack system, the first microcontroller read it is last under it is electric when each battery voltage, bus electricity
Stream and each battery pack temperature data；
Step 2), the second microcontroller send the signal of voltage acquisition to high-voltage acquisition unit, and high pressure sampling unit receives
To after voltage acquisition signal, the connecting line path of high pressure sampling unit, high pressure sampling unit sends high pressure to the second microcontroller
Data；
Step 3), the analog voltage of each data acquisition unit collection battery pack, temperature, the data in parallel with battery pack 1 are adopted
Collect the voltage analog signal of unit collection current divider, and amplified by amplifier；
Step 4), each data acquisition unit transmit the electricity of battery pack by isolating transformer to previous number according to collecting unit
Pressure, temperature, until the data acquisition unit in parallel with battery pack 1 sends voltage, temperature by isolating transformer to isolated transceiver
Degrees of data；
Step 5), isolated transceiver send voltage, the temperature data of battery pack, the second microcontroller to the first microcontroller
High-pressure data is sent to the first microcontroller, Hall current sensor sends voltage data to the first microcontroller；
Step 6), the first microcontroller calculates sampling connecting line 22 with sampling the pressure difference of connecting line 23, when pressure difference is less than threshold
Value U1, main negative contactor closure；First microcontroller calculates sampling connecting line 24 with sampling the pressure difference of connecting line 25, when pressure difference is big
In threshold value U2, preliminary filling contactor closure；After first microcontroller counts 100ms, the first microcontroller calculates sampling connecting line
24 pressure difference with sampling connecting line 25, when pressure difference is less than threshold value U3, main positive contactor closure, the disconnection of preliminary filling contactor.
The beneficial effects of the invention are as follows：The present invention utilizes distributed framework, master controller and the separation from controller,
Controller layout is upper more flexible, wider for different types of battery bag applicability；Sensed using current divider and Hall current
The Redundancy Design that device carries out current detecting make it that data acquisition is more reliable；Adopted by reliable current detecting and independent high pressure
Collect unit so that SOC estimations are more accurate, avoid the super-charge super-discharge of battery bag, on the premise of security is ensured, extend battery
The cycle life of bag.
Brief description of the drawings
Fig. 1 is battery pack system simplified schematic diagram；
Fig. 2 is high-voltage acquisition cell operation sketch；
Fig. 3 is battery pack structure schematic diagram；
Fig. 4 is battery pack system measure voltage ＆ current flow chart.
In figure：20- major-minor contactor negative terminals and high pressure sampling unit sampling connecting line；21- high pressures sampling unit ground connection connects
Wiring；22- fuses negative terminal and high pressure sampling unit sampling connecting line；23- fuses anode connects with the sampling of high pressure sampling unit
Wiring；The positive contactor negative terminal of 24- master and high pressure sampling unit sampling connecting line；The positive contactor anode of 25- master and high pressure sampling are single
Member sampling connecting line；31- master controllers BMU；32- is from controller CMU；41- battery cells；42- battery packs；43- battery bags.
Embodiment
With reference to the accompanying drawings, invention preferred embodiment is described in detail.
As shown in figure 1, battery pack system configuration diagram, battery pack system includes battery management system and battery bag 43,
Battery management system gathers battery pack system parameter, and wherein battery pack system parameter includes the total voltage of battery bag 43, fuse just,
Negative terminal voltage, the positive and negative terminal voltage of high voltage bus, bus current, each voltage of battery pack 42 and battery pack temperature；Wherein, it is female
Line refers to the connecting line of battery bag 43 and vehicle power unit, and what is be connected with the anode of battery bag 43 is high voltage bus anode, with battery
It is high voltage bus negative terminal to wrap 43 negative terminals to be connected, and the positive terminal voltage of high voltage bus is the pressure of sampling connecting line 25 and grounding connection line 21
Difference, high voltage bus negative terminal voltage are pressure difference of the grounding connection line 21 with sampling connecting line 20.Battery bag total voltage, fuse just,
Negative terminal voltage, the positive and negative terminal voltage of high voltage bus are to sample to obtain by high pressure sampling unit, each battery voltage and battery pack
Temperature parameter is to sample to obtain by data acquisition unit, and the sampling of bus current passes through Hall-type current sensor or shunting
Device samples to obtain.
Battery management system includes master controller BMU 31 and from controller CMU 32；Master controller BMU 31 is micro- by first
Controller, the second microcontroller, first contactor unit, second contactor unit, Hall current sensor, isolated transceiver and
High pressure sampling unit forms, and is formed from controller CMU 32 by data acquisition unit, isolating transformer and current divider.
Data acquisition unit uses Freescale MC33772 chips, and MC33772 is a complete battery monitoring IC,
Its built-in 6 ADC sampling channel, primary voltage and temperature data are sent per 10ms；Each MC33772 can be in input voltage
The voltage of 6 series batteries is at most measured in the case of 61.6V, as shown in figure 3, by 6 batteries inside each battery pack 42
Group series connection, each battery pack 42 are in parallel by 30 battery cells 41.Any one MC33772 gathers the voltage letter of 6 tunnel battery packs
Number, after temperature, the MC33772 at n-1 battery pack end is sent a signal to through isolating transformer, until battery pack 1 is through isolation
All data signals are sent to isolated transceiver by transformer.
The model MC33664 of isolated transceiver, after isolated transceiver MC33664 receives data signal, is converted into
Bit stream is sent to the first microcontroller in a manner of SPI.
Hall current sensor uses LEM DHAB S/106 output voltage signals, and carrying out digital-to-analogue by AD conversion IC turns
Change, the hall electromotive force that sensing obtains is sent to the first microcontroller by Hall current sensor in a manner of CAN communication.
Current divider uses VISHAY WSBS8518, the data acquisition unit in parallel with battery pack 1 by amplifying circuit and
ADC gathers the voltage of current divider VISHAY WSBS8518 inner terminals, by the voltage of current divider VISHAY WSBS8518 inner terminals
Current value is worth to the ratio of current divider resistance, calculating process is carried out in the first microcontroller.
First microcontroller will preferentially use the current value obtained by current divider VISHAY WSBS8518, when MC33772 believes
Number sampling is broken down, during dropout, current value that the first microcontroller will be obtained using Hall current sensor.
High pressure sampling unit uses TI ADS1148Q1 chips, and it possesses 16 analog-digital converters, and one is sent every 100ms
Sub-high pressure data.In Fig. 2, by rigid line, the positive and negative terminal with fuse, master are just connecing 6 GPIO pins of high pressure sampling unit respectively
The positive and negative terminal connection of the positive and negative terminal of tentaculum, main negative contactor, for collection voltages signal；Sample connecting line 20 and grounding connection line
Bear the pressure difference of relay based on 21 pressure difference, based on sampling connecting line 24 and the pressure difference for sampling connecting line 25 positive contactor voltage or
Person's preliminary filling contactor voltage, in the case where main contactor coil and preliminary filling contactor coil all power off, pressure difference is less than threshold value U3,
Then the first microcontroller is determined as main contactor or preliminary filling contactor adhesion；Connecting line 22 is sampled with sampling the pressure difference of connecting line 23
For the pressure difference of fuse, pressure difference is more than threshold value U1, then the first microcontroller judge fuse disconnected；.
Microcontroller uses Freescale MPC5744P, and the first microcontroller and the second microcontroller use same type
Number, the first microcontroller and the second microcontroller use CAN communication, and the first microcontroller is led to entire car controller VCU using CAN
Letter.
First contactor unit is formed by leading positive contactor, preliminary filling contactor, preliminary filling resistance, the second contactor unit
Based on bear contactor.
Battery bag is powered after being in series by n battery pack for vehicle power unit, and the battery in battery pack is ternary lithium
Ion battery, wherein n are odd number, and in the present embodiment, the number of data acquisition unit chip is determined according to the number n of battery pack used
Mesh；If the threshold value T of one of battery pack temperature >=setting1(experiment measures, when battery pack temperature value is between 0-50 DEG C, no
The chemical constitution of inside battery can be had an impact, preferably 25 DEG C of the present embodiment), then battery management system is to entire car controller
VCU sends cooling pump and opens request, if the threshold value T of one of battery pack temperature≤setting2(experiment measures, when battery pack temperature
Degree is less than 0 DEG C, and the internal resistance of cell starts substantially to rise, and the capacity of battery pack reduces, therefore needs to heat up to reduce internal resistance, so this reality
Apply a T2=0 DEG C), then battery management system sends heat request to entire car controller VCU；(n-1)/2 battery pack with
(n+1)/2 serial fuse between a battery pack, for protecting vehicle power unit；Battery bag positive terminal is sequentially connected Hall electricity
Flow sensor, first contactor unit, negative pole end are sequentially connected current divider, second contactor unit, first contactor unit
Two contact units are also connected with vehicle power unit respectively.
Each battery pack is in parallel with a data acquisition unit, using isolation transformation between each two data acquisition unit
Device carries out data transfer, to reduce signal interference；The I/O port of the data acquisition unit in parallel with battery pack 1 is connected point by rigid line
The inner terminal of device is flowed, for transmitting the voltage analog signal of collection；Data acquisition unit is changed analog signal by AD conversion
For data signal, the data acquisition unit in parallel with battery pack 1 is connected by isolating transformer with isolated transceiver, for sending
The data signal of voltage and temperature by AD conversion；Isolated transceiver is connected with the first microcontroller by rigid line, with SPI's
Mode sends data signal；First microcontroller uses with the second microcontroller, the second microcontroller and high pressure sampling unit
Twisted pair line connection, high pressure sampling unit collection high voltage analog signal, through AD conversion in high pressure sampling unit, by data signal
The second microcontroller is sent to, the high-voltage digital that the second microcontroller transmits the collection of high pressure sampling unit to the first microcontroller is believed
Number.
First microcontroller and entire car controller VCU use CAN communication, the first microcontroller also with Hall current sensor
Connected using rigid line, using CAN communication.
A kind of course of work of batteries of electric automobile packet system is：
Electricity, entire car controller VCU read battery pack system by CAN on entire car controller VCU and battery pack system
The first microcontroller last time under the data such as the dump energy at electric moment, health status, data acquisition unit, high-voltage acquisition list
Member, current divider, Hall sensor carry out voltage, electric current and temperature detection, the first microcontroller to measure voltage, current data
Calculation process is carried out, obtains current dump energy, health parameter, and be sent to entire car controller VCU, battery bag in real time
The high-pressure data that system obtains according to detection carries out Insulation monitoring, contactor adhesive controls with disconnecting, and battery pack system is according to inspection
The temperature value measured sends dependent instruction to entire car controller VCU, and entire car controller VCU controls the open and close of water pump, to enter
The heat management of row battery bag.
The detailed process of batteries of electric automobile packet system measure voltage ＆ current method is：
(1) it is electric on battery pack system, the first microcontroller read it is last under it is electric when each battery voltage, bus current and
Each battery pack temperature data.
(2) second microcontrollers send the signal of voltage acquisition to high-voltage acquisition unit, and high pressure sampling unit receives electricity
After pressure collection signal, the path of connecting line 20,21,22,23,24,25 of high pressure sampling unit, high pressure sampling unit is every 100ms
High-pressure data is sent to the second microcontroller.
(3) each data acquisition unit gathers each battery pack analog voltage and temperature signal simultaneously, in parallel with the 1st battery pack
Data acquisition unit collection current divider voltage analog signal, and pass through amplifier (being integrated in inside current divider) amplify.
(4) data acquisition unit in parallel with n-th of battery pack begin through isolating transformer to (n-1)th battery pack
The temperature and voltage digital signal of data acquisition unit transmission battery pack in parallel, data acquisition unit are AD converted, passed through
Isolating transformer is sent to isolated transceiver, until the data acquisition unit in parallel with battery pack 1 by isolating transformer to every
Voltage, temperature data are sent from transceiver, data acquisition unit sends primary voltage and temperature data per 10ms.
(5) isolated transceiver sends the voltage received and temperature digital signal by SPI communication in the form of bit stream
To the first microcontroller, the second microcontroller sends high-pressure data by CAN communication to the first microcontroller, positioned at high voltage bus
The Hall current sensor collection of negative terminal hall electromotive force, Hall current sensor caused by because of bus current pass through AD conversion
Output voltage values are sent to the first microcontroller in a manner of CAN communication, the first microcontroller with the Calibrated current that dispatches from the factory with
Output voltage ratio calculation is by current value, calibration process：With constant electric current I1By Hall current sensor, voltage is used
Table reads hall electromotive force VH1, in real operating mode, the electric current of any time is represented by：In=(I1/VH1)*VHn, wherein In
For the current value of any time, VHnFor the value of the hall electromotive force of any time, VHnValue be Hall current sensor to first
The data signal that microcontroller is sent.
(6) first microcontrollers calculate sampling connecting line 22 with sampling the pressure difference of connecting line 23, when pressure difference is less than threshold value U1
(U1Value for sampling connecting line 24 and the voltage difference of grounding connection line 21 1/n), main negative contactor closure；First microcontroller
Sampling connecting line 24 is calculated with sampling the pressure difference of connecting line 25, when pressure difference is more than threshold value U2(U2It is worth for sampling connecting line 24 and ground connection
The voltage difference of connecting line 21 90%), preliminary filling contactor closure；When the first microcontroller counts 100ms, (preliminary filling contactor closes
After 100ms, the capacitance voltage of vehicle power unit is up to the 90% of battery bag voltage, and now the main positive contactor of closure is to whole
The automobile-used nondestructive influence of electric unit) after, the first microcontroller calculates sampling connecting line 24 with sampling the pressure of connecting line 25
Difference, when pressure difference is less than threshold value U3(U3Be worth for sampling connecting line 24 and the voltage difference of grounding connection line 21 10%), main positive contactor
Closure, preliminary filling contactor disconnect.
When any one battery pack temperature >=25 DEG C, the first microcontroller sends cooling pump to entire car controller VCU and opened
Request is opened, when any one battery pack temperature≤0 DEG C, the first microcontroller sends heat request to entire car controller VCU.
The embodiment is preferred embodiment of the invention, but the present invention is not limited to above-mentioned embodiment, not
Away from the present invention substantive content in the case of, those skilled in the art can make it is any it is conspicuously improved, replace
Or modification belongs to protection scope of the present invention.
Claims (9)
1. a kind of batteries of electric automobile packet system, it is characterised in that battery pack system includes battery management system and battery bag, institute
Stating battery management system includes master controller BMU and from controller CMU；The master controller BMU is by the first microcontroller, second
Microcontroller, first contactor unit, second contactor unit, Hall current sensor, isolated transceiver and high pressure sampling are single
Member composition, it is described to be made up of from controller CMU data acquisition unit, isolating transformer and current divider；
The battery bag is powered after being in series by n battery pack for vehicle power unit, and wherein n is odd number, in (n-1)/2
Serial fuse between individual battery pack and (n+1)/2 battery pack, for protecting vehicle power unit；Battery bag positive terminal is successively
Hall current sensor, first contactor unit are connected, negative pole end is sequentially connected current divider, second contactor unit, and described the
One contact unit second contactor unit is also connected with vehicle power unit respectively；
Each battery pack is in parallel with a data acquisition unit, is entered between each two data acquisition unit using isolating transformer
Row data transfer, to reduce signal interference；The I/O port of the data acquisition unit in parallel with battery pack 1 is connected current divider by rigid line
Inner terminal, for transmit collection voltage analog signal；Data acquisition unit converts analog signals into number by AD conversion
Word signal, the data acquisition unit in parallel with battery pack 1 is connected by isolating transformer with isolated transceiver, for sending process
The voltage of AD conversion and the data signal of temperature；The isolated transceiver is connected with the first microcontroller by rigid line, with SPI's
Mode sends data signal；First microcontroller and the second microcontroller, the second microcontroller and high pressure sampling unit are equal
Using twisted pair line connection, high pressure sampling unit collection high voltage analog signal, through AD conversion in high pressure sampling unit, by numeral
Signal is sent to the second microcontroller, and the second microcontroller transmits the high pressure number of high pressure sampling unit collection to the first microcontroller
Word signal；
First microcontroller with using CAN communication with entire car controller VCU, first microcontroller also with Hall current
Sensor is connected, using CAN communication using rigid line.
A kind of 2. batteries of electric automobile packet system as claimed in claim 1, it is characterised in that the first contactor unit by
Main positive contactor, preliminary filling contactor, preliminary filling resistance are formed, and contactor is born based on the second contactor unit.
3. a kind of batteries of electric automobile packet system as claimed in claim 1, it is characterised in that the data acquisition unit uses
Freescale MC33772 chips, the model MC33664 of the isolated transceiver, Hall current sensor use LEM
DHAB S/106, current divider use VISHAY WSBS8518, and high pressure sampling unit uses TI ADS1148Q1 chips, microcontroller
Device uses MPC5744P.
4. a kind of batteries of electric automobile packet system as claimed in claim 1, it is characterised in that the battery in the battery pack is
Lithium ion battery.
A kind of 5. batteries of electric automobile packet system as claimed in claim 1, it is characterised in that the battery management system collection
Battery pack system parameter, wherein battery pack system parameter include battery bag total voltage, the positive and negative terminal voltage of fuse, high voltage bus
Positive and negative terminal voltage, bus current, each battery voltage and battery pack temperature；Wherein, bus refers to battery bag and vehicle electricity consumption
The connecting line of unit, what is be connected with battery bag anode is high voltage bus anode, and it is high voltage bus negative terminal to be connected with battery bag negative terminal,
The positive terminal voltage of high voltage bus is the pressure difference of sampling connecting line 25 and grounding connection line 21, and high voltage bus negative terminal voltage is grounding connection
The pressure difference of line 21 and sampling connecting line 20.
6. a kind of batteries of electric automobile packet system as claimed in claim 5, it is characterised in that battery bag total voltage, fuse
Positive and negative terminal voltage, the positive and negative terminal voltage of high voltage bus are to sample to obtain by high pressure sampling unit, each battery voltage and electricity
Pond group temperature parameter is to sample to obtain by data acquisition unit.
7. a kind of batteries of electric automobile packet system as described in profit requires 5, it is characterised in that the sampling of bus current passes through Hall
Formula current sensor or current divider are sampled to obtain, and the first microcontroller is preferentially calculated using current divider by voltage acquisition
The bus current value arrived, when current divider voltage acquisition breaks down, battery management system uses Hall-type current sensor
Sample obtained bus current value.
8. a kind of batteries of electric automobile packet system described in claim 1, it is characterised in that if one of battery pack temperature is big
In the threshold value T equal to setting1, then battery management system to entire car controller VCU send cooling pump open request, if one of them
Battery pack temperature is less than or equal to the threshold value T of setting2, then battery management system to entire car controller VCU send heat request.
A kind of 9. batteries of electric automobile packet system measure voltage ＆ current method, it is characterised in that comprise the following steps：
Step 1), electricity on battery pack system, the first microcontroller read it is last under it is electric when each battery voltage, bus current and
Each battery pack temperature data；
Step 2), the second microcontroller send the signal of voltage acquisition to high-voltage acquisition unit, and high pressure sampling unit receives electricity
After pressure collection signal, the connecting line path of high pressure sampling unit, high pressure sampling unit sends high-pressure data to the second microcontroller；
Step 3), each data acquisition unit gather analog voltage, the temperature of each battery pack, the data in parallel with battery pack 1 simultaneously
Collecting unit gathers the voltage analog signal of current divider, and is amplified by amplifier；
Step 4), each data acquisition unit by isolating transformer to previous number according to collecting unit transmit battery pack voltage,
Temperature, until the data acquisition unit in parallel with battery pack 1 sends voltage, temperature number by isolating transformer to isolated transceiver
According to；
Step 5), isolated transceiver send voltage, the temperature data of battery pack to the first microcontroller, and the second microcontroller is to the
One microcontroller sends high-pressure data, and Hall current sensor sends voltage data to the first microcontroller；
Step 6), the first microcontroller calculates sampling connecting line 22 with sampling the pressure difference of connecting line 23, when pressure difference is less than threshold value U1,
Main negative contactor closure；First microcontroller calculates sampling connecting line 24 with sampling the pressure difference of connecting line 25, when pressure difference is more than threshold
Value U2, preliminary filling contactor closure；First microcontroller count 100ms after, the first microcontroller calculate sampling connecting line 24 with
The pressure difference of connecting line 25 is sampled, when pressure difference is less than threshold value U3, main positive contactor closure, the disconnection of preliminary filling contactor.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108944459A (en) * | 2018-06-12 | 2018-12-07 | 中通客车控股股份有限公司 | A kind of high-voltage safety monitoring system and control method |
| CN110970672A (en) * | 2019-06-24 | 2020-04-07 | 宁德时代新能源科技股份有限公司 | Control system and method of battery pack heating system and battery pack heating management system |
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