CN109167402A - Power battery charging control method and device - Google Patents

Power battery charging control method and device Download PDF

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Publication number
CN109167402A
CN109167402A CN201810883959.2A CN201810883959A CN109167402A CN 109167402 A CN109167402 A CN 109167402A CN 201810883959 A CN201810883959 A CN 201810883959A CN 109167402 A CN109167402 A CN 109167402A
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CN
China
Prior art keywords
power battery
current
charging
constant
voltage
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Pending
Application number
CN201810883959.2A
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Chinese (zh)
Inventor
陆群
雷晓霂
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CH Auto Technology Co Ltd
Beijing Changcheng Huaguan Automobile Technology Development Co Ltd
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Beijing Changcheng Huaguan Automobile Technology Development Co Ltd
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Publication date
Application filed by Beijing Changcheng Huaguan Automobile Technology Development Co Ltd filed Critical Beijing Changcheng Huaguan Automobile Technology Development Co Ltd
Priority to CN201810883959.2A priority Critical patent/CN109167402A/en
Publication of CN109167402A publication Critical patent/CN109167402A/en
Pending legal-status Critical Current

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Classifications

    • H02J7/0077—
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/44—Methods for charging or discharging
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Secondary Cells (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)

Abstract

The present invention proposes power battery charging control method and device.Method includes:, when discovery meets constant-voltage charge entry condition, to record the current monolithic voltage U of power battery during the power battery charging of electric vehicle0；The current charging current of power battery is reduced into a preset step-length, the charging current value after reduction is sent to charging equipment, and start timer, timing length is preset duration；When timer is closed, judge whether to meet: U0The current monolithic voltage ﹥ preset threshold of power battery, if so, keeping the current charging current of power battery constant；Otherwise, directly returning to the current charging current by power battery reduces the movement of a preset step-length.Present invention improves power battery charging effect, the power battery service life is extended, and when charging equipment does not support constant voltage mode, realizes constant-voltage charge effect.

Description

Power battery charging control method and device
Technical field
The present invention relates to charging technique field more particularly to power battery charging control method and device.
Background technique
Constant-current charge, which refers to, to be charged using constant electric current as battery, and which charging current is larger, applies in general to Charging initial stage and mid-term；Constant-voltage charge refers to that charging voltage maintains constant charging modes, and latter stage of charging uses constant-voltage charge, can To guarantee that battery can be preferably full of.
When charging at present to power battery, four-part form charging method is generallyd use, this four sections specifically: trickle fills Electricity, the charging of Multi-section constant current constant pressure alternating, constant-voltage charge and floating charging.Wherein, according to battery management system send battery specifications, For distinguishing the voltage and current threshold value of each charging stage, equalizaing charge condition, charging termination condition and the battery pack that acquires in real time Temperature, assembled battery total voltage, monomer highest minimum voltage etc. automatically adjust charging current and charging voltage, i.e., according to practical electricity The different situations in pond, different situations of different batteries etc. automatically switch the charging stage, so that each charging stage is real in charging process Now accurate control.
Four-part form charging method has the drawback that
It is excessively high to charging equipment requirement, if charging equipment can not charge without constant pressure charge function according to the program. Such as: family's charging pile is largely alternating-current charging pile, and no constant pressure charge function can not then use this method to fill for power battery Electricity.
Summary of the invention
The present invention provides power battery charging control method and device, to improve power battery charging effect, improves power Battery life, and when charging equipment does not support constant voltage mode, still it is able to achieve constant-voltage charge effect.
The technical scheme of the present invention is realized as follows:
A kind of power battery charging control method, this method comprises:
During the power battery charging of electric vehicle, when discovery meets constant-voltage charge entry condition, power is recorded The current monolithic voltage U of battery0；
The current charging current of power battery is reduced into a preset step-length, the charging current value after reduction is sent to and is filled Electric equipment, and start timer, timing length is preset duration；
When timer is closed, judge whether to meet: U0The current monolithic voltage ﹥ preset threshold of power battery, if so, Keep the current charging current of power battery constant；Otherwise, returning to the current charging current by power battery reduces by one The movement of preset step-length.
Further comprise after the current charging current for keeping power battery is constant:
U is increased in the monomer voltage of power battery0When, returning to the current charging current by power battery reduces by one The movement of a preset step-length.
The constant-voltage charge entry condition are as follows:
The current SOC of the current monolithic voltage of power battery >=default constant-voltage charge voltage or power battery >=default Constant-voltage charge SOC.
When judgement is unsatisfactory for: U0When the current monolithic voltage ﹥ preset threshold of power battery, return described by power battery Current charging current reduce a preset step-length movement before further comprise:
Judge whether current charging current is not more than preset charged cut-off current, if so, confirmation power battery is full of, stops For power battery charging；Otherwise, returning to the current charging current by power battery reduces the movement of a preset step-length.
The charging equipment does not support constant voltage mode.
A kind of power battery charging control device, the device include:
Constant-voltage charge starts detection module, for during the power battery charging of electric vehicle, when discovery meet it is permanent When pressing charge initiation condition, the current monolithic voltage U of power battery is recorded0；
Constant-voltage charge control module, for when meeting constant-voltage charge entry condition, by the current charging electricity of power battery Stream reduces a preset step-length, the charging current value after reduction is sent to charging equipment, and start timer, timing length is Preset duration；When timer is closed, judge whether to meet: U0The current monolithic voltage ﹥ preset threshold of power battery, if so, Keep the current charging current of power battery constant；Otherwise, returning to the current charging current by power battery reduces by one The movement of preset step-length.
The constant-voltage charge control module keeps being further used for after the current charging current of power battery is constant,
U is increased in the monomer voltage of power battery0When, returning to the current charging current by power battery reduces by one The movement of a preset step-length.
The constant-voltage charge starting detection module discovery meets constant-voltage charge entry condition are as follows:
It was found that meeting: the current monolithic voltage of power battery >=default constant-voltage charge voltage or power battery it is current SOC >=default constant-voltage charge SOC.
The constant-voltage charge control module is unsatisfactory for when judgement: U0The current monolithic voltage ﹥ preset threshold of power battery When, return it is described will power battery current charging current reduce a preset step-length movement before further comprise:
Judge whether current charging current is not more than preset charged cut-off current, if so, confirmation power battery is full of, stops For power battery charging；Otherwise, returning to the current charging current by power battery reduces the movement of a preset step-length.
Described device is located on battery management system BMS.
The present invention is when meeting constant-voltage charge entry condition, by controlling the monomer voltage of power battery in a certain range Fluctuation, improves power battery charging effect, improves the power battery service life, and when charging equipment does not support constant voltage mode, Still it is able to achieve constant-voltage charge effect.
Detailed description of the invention
Only illustratively description and explain the present invention for the following drawings, not delimit the scope of the invention.
Fig. 1 is the power battery charging control method flow chart that one embodiment of the invention provides；
Fig. 2 be another embodiment of the present invention provides power battery charging control method flow chart；
Fig. 3 is the structural schematic diagram of power battery charging control device provided in an embodiment of the present invention.
Specific embodiment
In order to which the technical features, objects and effects of invention are more clearly understood, the Detailed description of the invention present invention is now compareed Specific embodiment.
Fig. 1 is the power battery charging control method flow chart that one embodiment of the invention provides, the specific steps of which are as follows:
Step 101: during the power battery charging of electric vehicle, when discovery meets constant-voltage charge entry condition, Record the current monolithic voltage U of power battery0。
Step 102: the current charging current of power battery being reduced into a preset step-length, by the charging current value after reduction It is sent to charging equipment, and starts timer, timing length is preset duration.
Step 103: when timer is closed, judging whether to meet: U0The current monolithic voltage ﹥ of power battery presets threshold Value, if so, keeping the current charging current of power battery constant；Otherwise, return step 102.
Wherein, keep the current charging current of power battery it is constant after further comprise: power battery monomer electricity Pressure is increased to U0When, return step 102.
Fig. 2 be another embodiment of the present invention provides power battery charging control method flow chart, the specific steps of which are as follows:
Step 201: during the power battery charging of electric vehicle, BMS (Battery Management System, Battery management system) in real time obtain power battery monomer voltage or SOC (State Of Charge, remaining capacity).
The monomer voltage of power battery refers to the voltage at single power battery both ends.
Step 202:BMS judges whether following condition is true: the current monolithic voltage U of power battery0>=default constant pressure is filled The current SOC of piezoelectric voltage or power battery >=default constant-voltage charge SOC, if so, executing step 203；Otherwise, return step 202。
Default constant-voltage charge voltage value or default constant-voltage charge SOC value can be true according to the characteristic of power battery and experience etc. It is fixed.
The current charging current of power battery is reduced a preset step-length by step 203:BMS, by the charging electricity after reduction Flow valuve is sent to charging equipment, and starts timer, and timing length is preset duration T1。
Preset step-length value can be determined according to the characteristic of power battery and experience etc..
Such as: current charging current is Icur, preset step-length is Δ I, then the charging current value I after reducingcur'=Icur― ΔI。
Charging equipment is such as: charging pile.
Step 204: as timer closing, i.e. timing length T1When arrival, BMS judges whether to meet: U0Power battery Current monolithic voltage ﹥ preset threshold, if so, executing step 205；Otherwise, step 206 is executed.
Preset threshold is the value greater than 0, and specific value can be determined according to the characteristic of power battery and experience etc..
That is, working as U0When current monolithic voltage≤preset threshold of power battery, show the monomer voltage fluctuation of power battery Less, it can continue to attempt to reduce charging current.
Step 205:BMS keeps the current charging current of power battery constant, and increases in the monomer voltage of power battery To U0When, return step 203.
That is, working as U0When the current monolithic voltage ﹥ preset threshold of power battery, show the monomer voltage fluctuation of power voltage It is excessive, then it should not continue to reduce charging current, and should continue using current charging current as power battery charging, until power voltage Monomer voltage restore to U0, then start to reduce charging current.
Step 206:BMS judges whether current charging current is not more than preset charged cut-off current, if so, confirmation power electric Pond is full of, this process terminates；Otherwise, return step 203.
Application example of the invention is given below:
Step 01: during the power battery charging of electric vehicle, BMS obtains the monomer voltage of power battery in real time.
The current monolithic voltage U of step 02:BMS discovery power battery0>=constant-voltage charge voltage is preset, it thens follow the steps 03。
Step 03:BMS is by current charging current I0A preset step-length Δ I is reduced, I is obtained1=I0Δ I, by I1It sends To charging equipment, and start timer, timing length is preset duration T1。
Step 04: as timer closing, i.e. timing length T1When arrival, BMS judges whether to meet: U0Power battery is worked as Preceding monomer voltage U1﹥ preset threshold, if so, step 05；Otherwise, I is enabled0=I1, return step 03.
Step 05:BMS keeps current charging current I1It is constant, and U is increased in the monomer voltage of power battery0When, enable I0 =I1, return step 03.
Fig. 3 is the structural schematic diagram of power battery charging control device provided in an embodiment of the present invention, which mainly wraps Include: constant-voltage charge starts detection module 31 and constant-voltage charge control module 32, in which:
Constant-voltage charge starts detection module 31, for during the power battery charging of electric vehicle, when discovery meets When constant-voltage charge entry condition, the current monolithic voltage U of power battery is recorded0, and taken to the transmission of constant-voltage charge control module 32 Band U0Starting instruction.
Constant-voltage charge control module 32, for when receiving starting instruction, the current charging current of power battery to be dropped A low preset step-length, is sent to charging equipment for the charging current value after reduction, and start timer, timing length is default Duration；When timer is closed, judge whether to meet: U0The current monolithic voltage ﹥ preset threshold of power battery, if so, keeping The current charging current of power battery is constant；Otherwise, it is default to return to the current charging current reduction by one by power battery The movement of step-length.
In practical applications, constant-voltage charge control module 32 keeps constant laggard one of the current charging current of power battery Step is used for, and is increased to U in the monomer voltage of power battery0When, returning to the current charging current by power battery reduces by one The movement of a preset step-length.
In practical applications, constant-voltage charge starting detection module 31 discovery meets constant-voltage charge entry condition are as follows: discovery is full Foot: the current SOC of the current monolithic voltage of power battery >=default constant-voltage charge voltage or power battery >=default constant pressure is filled Electric SOC.
In practical applications, constant-voltage charge control module 32, which is worked as, determines to be unsatisfactory for: U0The current monolithic voltage of power battery When ﹥ preset threshold, taking a step forward for the movement of current charging current one preset step-length of reduction by power battery is returned Include: judge whether current charging current is not more than preset charged cut-off current, if so, confirmation power battery be full of, stop be Power battery charging；Otherwise, returning to the current charging current by power battery reduces the movement of a preset step-length.
In practical applications, above-mentioned apparatus can be located on BMS.
Advantageous effects of the invention are as follows:
The present invention starts constant-voltage charge in power battery charging latter stage, when the monomer voltage of power battery keeps stablizing, Charging current is reduced, when the fluctuation of the monomer voltage of power battery is larger, keeps charging current constant, improves power battery and fill Electric effect improves the power battery service life, and when charging equipment does not support constant voltage mode, is still able to achieve constant-voltage charge effect.
The series of detailed descriptions listed above only for feasible embodiment of the invention specifically Protection scope that is bright, and being not intended to limit the invention, it is all without departing from equivalent embodiments made by technical spirit of the present invention or Change, such as the combination, segmentation or repetition of feature, should all be included in the protection scope of the present invention.

Claims (10)

1. a kind of power battery charging control method, which is characterized in that this method comprises:
During the power battery charging of electric vehicle, when discovery meets constant-voltage charge entry condition, power battery is recorded Current monolithic voltage U0；
The current charging current of power battery is reduced into a preset step-length, the charging current value after reduction is sent to charging and is set It is standby, and start timer, timing length is preset duration；
When timer is closed, judge whether to meet: U0The current monolithic voltage ﹥ preset threshold of power battery, if so, keeping dynamic The current charging current of power battery is constant；Otherwise, returning to the current charging current by power battery reduces a default step Long movement.
2. the method according to claim 1, wherein it is described keep power battery current charging current it is constant it Further include: afterwards
U is increased in the monomer voltage of power battery0When, returning to the current charging current by power battery reduces by one in advance If the movement of step-length.
3. the method according to claim 1, wherein the constant-voltage charge entry condition are as follows:
The current SOC of the current monolithic voltage of power battery >=default constant-voltage charge voltage or power battery >=default constant pressure Charge SOC.
4. the method according to claim 1, wherein when determining to be unsatisfactory for: U0The current monolithic electricity of power battery When pressing ﹥ preset threshold, returning to the current charging current by power battery reduces the advance one of movement of a preset step-length Step includes:
Judge whether current charging current is not more than preset charged cut-off current, if so, confirmation power battery is full of, stops being The charging of power battery；Otherwise, returning to the current charging current by power battery reduces the movement of a preset step-length.
5. the method according to claim 1, wherein the charging equipment does not support constant voltage mode.
6. a kind of power battery charging control device, which is characterized in that the device includes:
Constant-voltage charge starts detection module, for being filled during the power battery charging of electric vehicle when discovery meets constant pressure When electrically activating condition, the current monolithic voltage U of power battery is recorded0；
Constant-voltage charge control module, for when meeting constant-voltage charge entry condition, the current charging current of power battery to be dropped A low preset step-length, is sent to charging equipment for the charging current value after reduction, and start timer, timing length is default Duration；When timer is closed, judge whether to meet: U0The current monolithic voltage ﹥ preset threshold of power battery, if so, keeping The current charging current of power battery is constant；Otherwise, it is default to return to the current charging current reduction by one by power battery The movement of step-length.
7. device according to claim 6, which is characterized in that the constant-voltage charge control module is kept for working as power battery It is further used for after preceding charging current is constant,
U is increased in the monomer voltage of power battery0When, returning to the current charging current by power battery reduces by one in advance If the movement of step-length.
8. device according to claim 6, which is characterized in that the constant-voltage charge starting detection module discovery meets constant pressure Charge initiation condition are as follows:
It was found that meeting: the current SOC of the current monolithic voltage of power battery >=default constant-voltage charge voltage or power battery >= Default constant-voltage charge SOC.
9. device according to claim 6, which is characterized in that the constant-voltage charge control module is unsatisfactory for when judgement: U0- When the current monolithic voltage ﹥ preset threshold of power battery, returning to the current charging current by power battery reduces by one in advance If further comprising before the movement of step-length:
Judge whether current charging current is not more than preset charged cut-off current, if so, confirmation power battery is full of, stops being The charging of power battery；Otherwise, returning to the current charging current by power battery reduces the movement of a preset step-length.
10. device according to claim 6, which is characterized in that described device is located on battery management system BMS.
CN201810883959.2A 2018-08-06 2018-08-06 Power battery charging control method and device Pending CN109167402A (en)

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
CN110450676A (en) * 2019-08-19 2019-11-15 东软睿驰汽车技术（沈阳）有限公司 A kind of method and device controlling power battery electric current or power
CN111231766A (en) * 2020-03-03 2020-06-05 广州小鹏汽车科技有限公司 Intelligent charging control method for electric automobile, electric automobile and device
CN113119759A (en) * 2019-12-30 2021-07-16 观致汽车有限公司 Charging strategy of electric vehicle, computer readable storage medium and vehicle
CN114094646A (en) * 2020-08-24 2022-02-25 北京小米移动软件有限公司 Charging control method, charging control device, electronic device and storage medium
CN114454766A (en) * 2022-02-25 2022-05-10 重庆金康动力新能源有限公司 Power battery charging method, system and equipment
CN115296379A (en) * 2022-10-09 2022-11-04 成都特隆美储能技术有限公司 Charging method for household energy storage system
CN117410601A (en) * 2023-12-14 2024-01-16 合肥联宝信息技术有限公司 Battery charging method and device, electronic equipment and storage medium

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CN110450676A (en) * 2019-08-19 2019-11-15 东软睿驰汽车技术（沈阳）有限公司 A kind of method and device controlling power battery electric current or power
CN113119759A (en) * 2019-12-30 2021-07-16 观致汽车有限公司 Charging strategy of electric vehicle, computer readable storage medium and vehicle
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CN115296379A (en) * 2022-10-09 2022-11-04 成都特隆美储能技术有限公司 Charging method for household energy storage system
CN117410601A (en) * 2023-12-14 2024-01-16 合肥联宝信息技术有限公司 Battery charging method and device, electronic equipment and storage medium

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Application publication date: 20190108