CN108054731B - A kind of setting method of power battery voltage protection - Google Patents

A kind of setting method of power battery voltage protection Download PDF

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Publication number
CN108054731B
CN108054731B CN201711412883.7A CN201711412883A CN108054731B CN 108054731 B CN108054731 B CN 108054731B CN 201711412883 A CN201711412883 A CN 201711412883A CN 108054731 B CN108054731 B CN 108054731B
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China
Prior art keywords
voltage
battery
protection
power battery
setting
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CN201711412883.7A
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CN108054731A (en
Inventor
李世明
王世强
胡庆军
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Jiangxi Special Automobile Technology Co Ltd
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Jiangxi Special Automobile Technology Co Ltd
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Priority to CN201711412883.7A priority Critical patent/CN108054731B/en
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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/18Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M10/4257Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00Details of emergency protective circuit arrangements
    • H02H1/0007Details of emergency protective circuit arrangements concerning the detecting means
    • HELECTRICITY
    • H01BASIC ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/42Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/425Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
    • H01M2010/4271Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

Abstract

Present invention discloses a kind of setting methods of power battery voltage protection: 1) test obtains power battery cycle life and by the relationship of voltage;2) cycle life obtained according to test selectes the protection threshold value of power battery 0%SOC voltage, 100%SOC voltage with by the relationship of voltage and the cycle life target of battery protection;3) the voltage detecting precision of battery management system is demarcated;4) threshold value is arranged according to error transfer factor battery management system in the error that battery management system is obtained according to voltage detecting precision.The advantage of the invention is that sufficiently measuring influence of each voltage threshold for the power battery service life; eliminate influence of battery management system test error for voltage protection itself; not only reach the protection target of battery setting, but also play the capacity and performance of battery to the greatest extent.

Description

A kind of setting method of power battery voltage protection
Technical field
The present invention relates to electric car field more particularly to the power battery technologies of electric car.
Background technique
Pure electric automobile, there are also hybrid vehicles, using power battery as power source, in motor driven or power generation work Under condition, power output or recycling are carried out.In long-term selection, lithium battery becomes mainstream.The characteristics of due to lithium battery itself, Normal operating range has stringent limitation, be more than voltage range, temperature range, current range all can serious damage lithium battery, Therefore the frequent match management system BMS of lithium dynamical battery (Battery Management System) could be used.
In the use process of power battery, the charge and discharge terminal of normal use is accelerating climbing and electricity recoverable big In power scene, the maximum power (such as patent application 201611104627.7) that can continue, under exception and abuse conditions, The super-charge super-discharge of battery protects point, system all related to voltage.There is test to show that charge termination voltage is more than 50 millivolts, battery follows The ring service life will be reduced to 50%, and security risk greatly increases, but the full every raising 100mV of piezoelectric voltage, battery active volume 10% can be improved.Therefore battery management system BMS can have voltage detecting and voltage protection, to meet cycle life requirement Under the premise of improve battery capacity as far as possible.
The BMS voltage protection of the prior art detects essence typically directly with the voltage value that detects compared with setting value Spend usually even lower in 10mV, this just makes battery bear the risk of 10mV super-charge super-discharge overcurrent, and simple and crude battery management system System test error reaches 20mV even 50mV, will cause tremendous influence with safety in the service life to power battery.
Summary of the invention
The technical problem to be solved by the present invention is to realize a kind of power battery that can be avoided due to the deviation of voltage detecting The dynamic lithium battery voltage protection setting method endangered by super-charge super-discharge overcurrent.
To achieve the goals above, a kind of the technical solution adopted by the present invention are as follows: setting side of power battery voltage protection Method:
1) test obtains power battery cycle life and the relationship by voltage;
2) cycle life obtained according to test with by the relationship of voltage and the cycle life target of battery protection, The protection threshold value of selected power battery 0%SOC voltage, 100%SOC voltage;
3) the voltage detecting precision of battery management system is demarcated;
4) error that battery management system is obtained according to voltage detecting precision, sets according to error transfer factor battery management system Set threshold value.
It is described 4) in, 100%SOC voltage is subtracted into battery management system voltage detecting worst error as full piezoelectric voltage, Using 0% voltage plus battery management system voltage detecting worst error as empty piezoelectric voltage.
It is described 4) in high pressure overvoltage protection voltage subtracted into battery management system voltage detecting worst error, low pressure is owed Pressure protection voltage adds battery management system voltage detecting worst error.
1) small amount sample for making target power battery is tested.
3) the selected battery management system BMS, including voltage detection module, communication module and management module, and according to Selected calibration battery management system obtains relevant voltage detection accuracy.
The advantage of the invention is that sufficiently measuring influence of each voltage threshold for the power battery service life, electricity is eliminated Influence of the pond management system test error for voltage protection itself had not only reached the protection target of battery setting, but also utmostly Performance battery capacity and performance.
Detailed description of the invention
The content of width attached drawing every in description of the invention expression is briefly described below:
Fig. 1 is the flow chart of power battery voltage protection setting method.
Specific embodiment
The setting method of dynamic lithium battery voltage protection of the present invention, can be avoided deviation of the power battery because of voltage detecting And by the harm of super-charge super-discharge overcurrent, specific setting method is as follows:
Step 1: production target power battery 100mAh or other capacity small samples.
Step 2: using the high precision measurement device measuring cycles samples service life and by the relationship of voltage.
Step 3: selecting 0%SOC voltage, 100%SOC according to the cycle life target of measurement result and battery protection Voltage and equal voltage protections threshold value.
Step 4: selected battery management system BMS, including voltage detection module, communication module and management module.
Step 5: the voltage detecting precision of calibration battery management system.
Step 6: 100%SOC voltage is subtracted battery management system voltage detecting worst error as piezoelectric voltage is expired, incite somebody to action 0% voltage is plus battery management system voltage detecting worst error as empty piezoelectric voltage.Similarly, high pressure overvoltage protection voltage needs Battery management system voltage detecting worst error is subtracted, low pressure under-voltage protection voltage is needed plus battery management system voltage Detect worst error.
Step 7: using each battery threshold obtained by step 7 as the practical voltage threshold executed of battery management system.
Below by taking hybrid power H15 as an example, as shown in Figure 1, the setting side of battery management system voltage threshold is described in detail Method:
Step 1: making button cell LIR2032, capacity 30mAh in grab sample in producing line.
Step 2: using the relationship in high precision measurement device measuring cycles samples service life and blanking voltage.
Step 3: selecting 0%SOC voltage, 100%SOC according to the cycle life target of measurement result and battery protection Voltage and equal voltage protections threshold value, since usual under-voltage protection is generally arranged at 10%SOC, be embodied case one with For full piezoelectric voltage, selecting 100%SOC completely electric by voltage by 1500 cycle lives of quality assurance needs is 4.150V.
Step 4: selected battery management system BMS, including voltage detection module, communication module and management module.
Step 5: the voltage detecting precision of calibration battery management system, measurement voltage precision 20mV.
Step 6: 100%SOC voltage 4.150V is subtracted 20mV4.130V as charge cutoff voltage.
Step 7: using 4.130V as the practical full electric cutoff voltage threshold executed of battery management system.

Claims (5)

1. a kind of setting method of power battery voltage protection, it is characterised in that:
1) test obtains the relationship of power battery cycle life and blanking voltage;
2) relationship of the cycle life and blanking voltage obtained according to test and the cycle life target of battery protection, are selected The protection threshold value of power battery 0%SOC voltage, 100%SOC voltage;
3) the voltage detecting precision of battery management system is demarcated;
4) threshold value is arranged according to error transfer factor battery management system in the error that battery management system is obtained according to voltage detecting precision Realize the protection to power battery voltage.
2. the setting method of power battery voltage protection according to claim 1, it is characterised in that: it is described 4) in by 100% SOC voltage subtracts battery management system voltage detecting worst error as full piezoelectric voltage, and 0% voltage is added battery management system Voltage detecting worst error is as empty piezoelectric voltage.
3. the setting method of power battery voltage protection according to claim 1 or 2, it is characterised in that: it is described 4) in, will High pressure overvoltage protection voltage subtracts battery management system voltage detecting worst error, and low pressure under-voltage protection voltage is added cell tube It manages system voltage and detects worst error.
4. the setting method of power battery voltage protection according to claim 3, it is characterised in that: 1) described includes production The small amount sample of target power battery is tested.
5. the setting method of power battery voltage protection according to claim 1 or 4, it is characterised in that: described 3) to select Battery management system BMS, including voltage detection module, communication module and management module, and according to selected calibration cell tube Reason system obtains relevant voltage detection accuracy.
CN201711412883.7A 2017-12-24 2017-12-24 A kind of setting method of power battery voltage protection Active CN108054731B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711412883.7A CN108054731B (en) 2017-12-24 2017-12-24 A kind of setting method of power battery voltage protection

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711412883.7A CN108054731B (en) 2017-12-24 2017-12-24 A kind of setting method of power battery voltage protection

Publications (2)

Publication Number Publication Date
CN108054731A CN108054731A (en) 2018-05-18
CN108054731B true CN108054731B (en) 2019-02-19

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Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4495116B2 (en) * 2005-06-30 2010-06-30 エルジー・ケム・リミテッド Battery remaining capacity estimation method and battery management system using the same
CN103344919B (en) * 2013-06-26 2017-02-15 天津市松正电动汽车技术股份有限公司 Method for calibrating SOC of lithium-ion battery
CN106451682B (en) * 2016-12-05 2019-12-10 潍柴动力股份有限公司 battery power limiting protection method and system based on battery safety voltage

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