CN102290848B - Lead-acid battery management system and management method thereof - Google Patents

Lead-acid battery management system and management method thereof Download PDF

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Publication number
CN102290848B
CN102290848B CN 201110246811 CN201110246811A CN102290848B CN 102290848 B CN102290848 B CN 102290848B CN 201110246811 CN201110246811 CN 201110246811 CN 201110246811 A CN201110246811 A CN 201110246811A CN 102290848 B CN102290848 B CN 102290848B
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CN
China
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module
lead
battery
acid battery
communication
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CN 201110246811
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Chinese (zh)
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CN102290848A (en
Inventor
张博
王镇东
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奇瑞汽车股份有限公司
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Abstract

The invention relates to a lead-acid battery management system and a management method thereof; the lead-acid battery management system is used for a low voltage electric motor car and comprises a central processing unit, a sampling module, a CAN (Controller Area Network) communication module and a control module, wherein the sampling module is used for collecting the voltage, temperature and current signals of a lead-acid battery; the central processing unit is connected with the sampling module in a communication manner and is used for receiving and operating the signals of the sampling module; the CAN (Controller Area Network) communication module is connected with a charger and a finished car system by a CAN (Controller Area Network) bus in a communication way; and the central processing unit monitors the state of the battery and the system in real time and drives a control module to output a control signal for controlling according to the state.

Description

A kind of lead-acid battery management system and management method thereof

Technical field

The present invention relates to a kind of lead-acid battery management system and management method thereof, be applicable to management and the protection of Low Voltage Pure used for electric vehicle lead-acid power accumulator.

Background technology

For pure electric vehicle, electrokinetic cell and management system thereof are one of its key core technology.Battery management system is responsible for the collection of electrokinetic cell voltage, temperature and charging and discharging currents, the control of high-low voltage relay, the calculating of SOC and SOH, the monitoring of battery system and failure diagnosis, the balanced management of battery cell etc. function is an indispensable part in the car load control and management strategy.

The lead-acid battery technical development is very ripe, cheap, safe and reliable so far, can export larger electric current and power, is applicable to the low-pressure electric vehicle.But along with wearing out of battery, descending can appear in its property indices equally, can occur capacity attenuation in various degree between each cell, and cell voltage occurs unbalanced largely in the running.Therefore lead-acid battery needs equally a kind of management system, comes the Real-Time Monitoring battery status, the protection battery is super-charge super-discharge not, prolongs battery shelf life.

At present how not comprise management system with lead-acid battery as the electric automobile of electrokinetic cell, can't detect battery status, be unfavorable for the maintenance of battery.

Summary of the invention

The object of the invention is to solve the problem that administers and maintains of lead-acid battery, by detection voltage, temperature, the analog quantitys such as electric current detect battery status in real time, and the problem that occurs in the Vehicle Driving Cycle process is in time processed.Simultaneously can do certain maintenance to battery.Can effectively protect battery, delay the battery aging, increase the service life.

The invention provides a kind of composition and function of low-pressure electric vehicle lead-acid battery management system, the hardware using centralized solution is in collection and control algolithm and the communication function of same circuit board realization analog quantity.Specifically comprise plurality of voltages sampling, Multi-current Sampling, single channel current sample, Control and time inspection, CAN communication module, detection of electrical leakage module, charging induction module, balance module.These modules all link to each other with central processing element, make control and corresponding by control strategy according to corresponding state simultaneously by software real-time detecting system state.This hardware outside connects the lead-acid battery wire harness by corresponding connector and gathers analog quantity, and by the CAN line with Full Vehicle System and charger communication.

Native system software is responsible for the calculating of analog quantity, and the processing of control logic is with CAN communication and the information interaction of Full Vehicle System.Specifically comprise the calculating of system mode, high-voltage safety management algorithm, detection of electrical leakage, system diagnosability algorithm, detection and the estimation of battery nuclear power state, the processing of CAN communication.Native system has sampling and control function, and can be through CAN bus and charger and Full Vehicle System communication.Sampling module is responsible for the collection of cell voltage, temperature, electric current, by the computing of central processor unit, and Real-Time Monitoring battery and system mode, and drive control module output.By with the communication of charger and Full Vehicle System, administer and maintain the reliable and secure operation of lead-acid battery.

Concrete technical scheme is as follows:

A kind of lead-acid battery management system, it is used for the low tension motor-car, comprise central processing unit, sampling module, CAN communication module and control module, described sampling module is used for the voltage to lead-acid battery, temperature and current signal gather, described central processor unit is connected and is used for receiving the signal union of sampling module with the sampling module communication, described CAN communication module is connected with charger and Full Vehicle System communication through the CAN bus, described central processor unit Real-Time Monitoring battery and system mode, and export control signal according to described state-driven control module and control.

Further, described central processing unit adopts a single-chip microcomputer.

Further, described CAN communication module is a CAN transceiver.

Further, sampling module comprises the plurality of voltages sampling module, multi way temperature sampling module and current sample module.

Further, also comprise Control and return inspection module, detection of electrical leakage module, the charging induction module, balance module, described current sample module comprise Multi-current Sampling module and single channel current sample module, and above-mentioned module is all carried out communication with central processing element and is connected.

Further, its by plug-in unit and connection lead-acid battery wire harness and gather analog quantity, and connected with Full Vehicle System and charger communication by the CAN line.

The management method of above-mentioned lead-acid battery management system; carry out the collection of each analog quantity of lead-acid battery; comprise monomer voltage; monomer temperature and bus current; process that above-mentioned data are carried out the monitoring of system mode and to the control and protection of battery; central processor unit Real-Time Monitoring battery and system mode, and export control signal according to described state-driven control module and control.

Further, gather the voltage of every battery cell in the plurality of voltages sampling, every lead-acid battery needs two sample line, positive and negative each one, after hardware circuit switches this cell voltage dividing potential drop, enter the AD chip, export digital quantity by AD conversion AD chip, the digital quantity input single-chip microcomputer after via the SPI communication AD chip being transformed, calculate monomer voltage by single-chip microcomputer, monomer voltage is added up to obtain total voltage simultaneously.

Further, the multi way temperature sampling gathers the temperature of every battery cell; Introduce battery temperature and ambient temperature by temperature sensor, transform through AD digital quantity is inputted single-chip microcomputer, calculate current temperature value by single-chip microcomputer.

Further, in the current sample, by Hall current sensor and related hardware circuit bus current is converted to voltage signal, through the AD chip digital quantity is inputted single-chip microcomputer, calculate current value by single-chip microcomputer.

Compare with present prior art, the present invention the same circuit board integrated the sampling and control function.With low cost, simple and reliable.

Description of drawings

Fig. 1 is that this management system structured flowchart reaches in the connection diagram of charger, lead-acid power accumulator, whole-control system.

Embodiment

The below describes the present invention with reference to the accompanying drawings, and it is a kind of preferred embodiment in the numerous embodiments of the present invention.

Native system can be finished the collection of each analog quantity of lead-acid battery, comprises monomer voltage, monomer temperature and bus current.Utilize simultaneously these data to carry out the monitoring of system mode and to the control and protection of battery.

The plurality of voltages sampling, this management system gathers the voltage of every battery cell.Because the lead-acid battery volume is larger, distribute and may not concentrate at car load, many batteries are scattered in front deck, base plate and boot, its discharging current is larger again simultaneously, therefore in order to reduce the rat tail pressure drop, every battery needs two sample line, positive and negative each one.After switching this cell voltage dividing potential drop, hardware circuit enters the AD chip, by AD conversion AD chip output digital quantity, digital quantity input single-chip microcomputer after via the SPI communication AD chip being transformed calculates monomer voltage by single-chip microcomputer, can obtain total voltage with monomer voltage is cumulative simultaneously.

The multi way temperature sampling, this management system gathers the temperature of every battery cell.Introduce battery temperature and ambient temperature by temperature sensor, transform through AD digital quantity is inputted single-chip microcomputer, calculate current temperature value by single-chip microcomputer.

Current sample, current sample can the current charging and discharging states of monitoring battery group, and the size of charging and discharging currents according to battery status, is in time adjusted and discharged and recharged the maximum current limit value with the protection battery.The accuracy of current sample directly has influence on the calculating of battery nuclear power state (SOC) simultaneously.This module is converted to voltage signal by Hall current sensor and related hardware circuit with bus current, through the AD chip digital quantity is inputted single-chip microcomputer, calculates current value by single-chip microcomputer.

SOC predicts, calculates the nuclear power state of current battery, i.e. the current residual capacity.Native system adopts the combination of ampere-hour integration method and open circuit voltage method to calculate SOC.In the car load running, the variation of adopting the ampere-hour integration method to calculate SOC writes single-chip microcomputer EEPROM with current SOC value simultaneously when set time and system-down.The prediction of initial SOC, i.e. the prediction of SOC during system boot utilizes the relation of open circuit voltage and SOC can obtain a SOC, the SOC when reading single-chip microcomputer EEPROM and can obtain shutting down last time, both respectively account for 50%, as the current SOC of system.

Whether detection of electrical leakage leaks electricity for detection of battery.

The CAN transceiver is responsible for receiving and sending the CAN data, with the Full Vehicle System communication.

The charging induction for detection of charger and charging wire state, does not allow Vehicle Driving Cycle when detecting charged state.

Balance module is used for the maintenance of battery.The long-term decay of using battery can cause battery capacity reaches the inconsistency that each monomer is seen.A kind of showing as under static state wherein, the difference of each battery cell voltage become large.This module can detection module voltage be higher than the monomer of average, and to its discharge, thereby reach balanced effect.

Control comprises precharge and the safety cut-off function of dynamical system.Pre-charging functions is used for guaranteeing the safety connection of dynamical system, may cause the adhesion of relay when the moment connection of whole dynamical system, therefore increase pre-charge-relay and pre-charge resistance.After receiving the dynamical system close command, first closed pre-charge-relay, then wait for the dynamical system output end voltage more than or equal to the battery-end total voltage 80% after, closed anodal relay disconnects pre-charge-relay afterwards again.When this management system detects catastrophe failure and when unusual, disconnects all relays, guarantee car load and personal security.

The above has carried out exemplary description to the present invention by reference to the accompanying drawings; obviously specific implementation of the present invention is not subjected to the restriction of aforesaid way; as long as the various improvement of having adopted method design of the present invention and technical scheme to carry out; or directly apply to other occasion without improvement, all within protection scope of the present invention.

Claims (3)

1. a lead-acid battery management system is characterized in that, it is used for the low tension motor-car, and the wire harness by plug-in unit and connection lead-acid battery also gathers analog quantity, and connected with Full Vehicle System and charger communication by the CAN line;
Comprise: central processing unit, sampling module, the CAN communication module, control module, Control and time inspection module, the detection of electrical leakage module, charging induction module and balance module,
Wherein,
Described central processing unit adopts a single-chip microcomputer, and it is connected and is used for receiving the signal union of sampling module with the sampling module communication;
Described sampling module is used for voltage, temperature and the current signal of lead-acid battery are gathered, it comprises the plurality of voltages sampling module, multi way temperature sampling module and current sample module, described current sample module comprise Multi-current Sampling module and single channel current sample module;
Described CAN communication module is a CAN transceiver, and it is connected with charger and Full Vehicle System communication through the CAN bus;
Described control module is used for the output control signal, described central processor unit Real-Time Monitoring battery and system mode, and export control signal according to described state-driven control module and control;
Described Control and time inspection module, the detection of electrical leakage module, the charging induction module, balance module all carries out communication with central processing element and is connected;
Described sampling module carries out the collection of each analog quantity of lead-acid battery, comprise monomer voltage, monomer temperature and bus current, central processing unit carries out the monitoring of system mode for the treatment of the data of sampling module collection and to the control and protection of battery, central processor unit Real-Time Monitoring battery and system mode, and export control signal according to described state-driven control module and control;
The plurality of voltages sampling module is used for gathering the voltage of every battery cell, every lead-acid battery needs two sample line, positive and negative each one, after switching this cell voltage dividing potential drop, hardware circuit enters the AD chip, by AD conversion AD chip output digital quantity, digital quantity input single-chip microcomputer after via the SPI communication AD chip being transformed calculates monomer voltage by single-chip microcomputer, simultaneously with the cumulative total voltage that obtains of monomer voltage.
2. the management method of lead-acid battery management system as claimed in claim 1 is characterized in that, the multi way temperature sampling module is used for gathering the temperature of every battery cell; Introduce battery temperature and ambient temperature by temperature sensor, transform through AD digital quantity is inputted single-chip microcomputer, calculate current temperature value by single-chip microcomputer.
3. the management method of lead-acid battery management system as claimed in claim 2, it is characterized in that, in the current sample, by Hall current sensor and related hardware circuit bus current is converted to voltage signal, through the AD chip digital quantity is inputted single-chip microcomputer, calculate current value by single-chip microcomputer.
CN 201110246811 2011-08-25 2011-08-25 Lead-acid battery management system and management method thereof CN102290848B (en)

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CN104267352A (en) * 2014-09-28 2015-01-07 苏州克兰兹电子科技有限公司 Multifunctional electric vehicle battery management system
CN104617348A (en) * 2015-01-30 2015-05-13 成都星炫科技有限公司 Battery monitoring device of electrocar for children
CN105216650A (en) * 2015-11-06 2016-01-06 浙江绿源电动车有限公司 Battery-driven car and charging unit
CN107390571A (en) * 2017-06-19 2017-11-24 江苏大学 A kind of batteries of electric automobile packet system and its measure voltage & current method
CN108189689A (en) * 2017-12-29 2018-06-22 智车优行科技(北京)有限公司 The cell managing device and method of integrated security unit
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