CN108550928B - Electric automobile, charging and discharging equipment, and method and system for detecting SOH of battery - Google Patents
Electric automobile, charging and discharging equipment, and method and system for detecting SOH of battery Download PDFInfo
- Publication number
- CN108550928B CN108550928B CN201810474575.5A CN201810474575A CN108550928B CN 108550928 B CN108550928 B CN 108550928B CN 201810474575 A CN201810474575 A CN 201810474575A CN 108550928 B CN108550928 B CN 108550928B
- Authority
- CN
- China
- Prior art keywords
- battery
- charging
- discharging
- stage
- enter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000007599 discharging Methods 0.000 title claims abstract description 132
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000001514 detection method Methods 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 6
- 238000004891 communication Methods 0.000 description 9
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 8
- 229910052744 lithium Inorganic materials 0.000 description 8
- 239000000178 monomer Substances 0.000 description 5
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 4
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 4
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 238000013528 artificial neural network Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000009194 climbing Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000284 resting effect Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Images
Classifications
-
- 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
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
-
- 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
- H01M10/4285—Testing apparatus
-
- 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
-
- 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
- H01M10/46—Accumulators structurally combined with charging apparatus
-
- 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
Landscapes
- 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 invention relates to an electric automobile, charging and discharging equipment, and a method and a system for detecting a battery SOH, wherein the method for detecting the battery SOH comprises the following steps: receiving a start instruction of SOH calibration, and handshaking with a BMS module of the electric automobile; receiving a rated capacity of a battery; determining a calibration strategy, and controlling the battery to execute the calibration strategy, wherein the step of controlling the battery to execute the calibration strategy is as follows: firstly, controlling the battery to enter a charging stage until a charging cut-off condition is met, then controlling the battery to enter a standing stage, and finally controlling the battery to enter a discharging stage until the discharging cut-off condition is met, and acquiring the calibrated capacity of the battery in the discharging stage; calculating the SOH of the battery according to the rated capacity and the calibration capacity of the battery; the calculated SOH of the battery is output. By implementing the technical scheme of the invention, the error of the obtained SOH value of the battery is small, and the precision is high.
Description
Technical Field
The invention relates to the field of electric automobiles, in particular to an electric automobile, charging and discharging equipment and a method and a system for detecting a battery SOH.
Background
In recent years, with the development of energy revolution, electric automobiles are gradually developed as a secondary revolution of the conventional automobile industry. Increasingly, battery enterprises and automobile enterprises add the large automobile-building army of electric automobiles, and the vigorous development of the electric automobiles is accelerated. However, as more types of electric vehicles are introduced into the market, various problems occur in the use process of the vehicles, wherein the most central problem is the power performance of the power battery system of the electric vehicle.
The power battery is used as the heart of the electric automobile, and the power performance of the power battery can be attenuated to different degrees along with the examination of various working conditions and environments in the using process of the automobile. The performance attenuation of the power battery comprises a recoverable part and a non-recoverable part, wherein the recoverable part can eliminate the performance attenuation of the recoverable part through timely discovery and timely maintenance. How to estimate the degradation of the battery, i.e., the state of health (SOH), timely and accurately is a difficult problem for the BMS. The estimation accuracy of the SOH of the battery directly affects the estimation accuracy of the SOC (State of charge) of the battery system. Therefore when the battery performance takes place the decay, thereby BMS can appear to battery SOH's estimation rule not accurate to the SOC data estimation that leads to BMS, can lead to vehicle operator in the use vehicle process, when BMS tells battery system SOC and has more relatively surplus, the vehicle can not start or the vehicle can not accelerate and operation such as climbing, and the person of heaviness probably leads to the vehicle to stop power output in normal operating, and the vehicle appears half way and lies prone the nest condition.
The following method is generally adopted in the current industry to obtain the SOH value of the battery of the electric vehicle: and comparing initial data before the battery leaves the factory and laboratory test data of the same type or batch of battery according to historical charging and discharging data of the battery, and estimating by using algorithms such as Kalman filtering, artificial neural network and the like. However, due to the diversity of the actual operation conditions of the battery and the complexity of the internal structure and the electrochemical principle of the battery, the existing estimation method has extremely inaccurate estimation of the SOH value of the battery, the actual state of health of the battery is greatly different from the estimated SOH value of the battery, and the error is increased along with the increase of time.
Disclosure of Invention
In order to solve the technical problem of inaccurate SOH estimation value in the prior art, the invention provides an electric vehicle, charging and discharging equipment, and a method and a system for detecting SOH of a battery, which can obtain the SOH of the battery with higher precision.
The technical scheme adopted by the invention for solving the technical problems is as follows: the method for detecting the SOH of the battery is constructed, and after an electric automobile is connected to a direct current gun of charging and discharging equipment, the charging and discharging equipment carries out the following steps:
s11, receiving an SOH calibration starting instruction input by a user, and handshaking with a BMS module of the electric automobile according to the starting instruction;
s12, receiving the rated capacity of the battery sent by the BMS module;
s13, determining a calibration strategy, and controlling a battery to execute the calibration strategy, wherein the step of controlling the battery to execute the calibration strategy is as follows: firstly, controlling the battery to enter a charging stage until a charging cut-off condition is met, then controlling the battery to enter a standing stage, and finally controlling the battery to enter a discharging stage until the discharging cut-off condition is met, and acquiring the calibrated capacity of the battery in the discharging stage; or, the battery is controlled to enter a discharging stage until a discharging cut-off condition is met, then the battery is controlled to enter a standing stage, and finally the battery is controlled to enter a charging stage until the charging cut-off condition is met, and the calibrated capacity of the battery in the charging stage is obtained;
s14, calculating the SOH of the battery according to the rated capacity and the calibrated capacity of the battery;
and S15, outputting the calculated SOH of the battery.
Preferably, the step S13 includes:
s131, acquiring the current SOC of the battery, judging whether the current SOC is greater than 50%, and if so, executing a step S132; if not, go to step S133;
step S132, controlling the battery to enter a charging stage until a charging cut-off condition is met, then controlling the battery to enter a standing stage, finally controlling the battery to enter a discharging stage until the discharging cut-off condition is met, acquiring the calibrated capacity of the battery in the discharging stage, and then executing step S14;
and S133, controlling the battery to enter a discharging stage until a discharging cut-off condition is met, then controlling the battery to enter a standing stage, finally controlling the battery to enter a charging stage until the charging cut-off condition is met, acquiring the calibrated capacity of the battery in the charging stage, and then executing S14.
Preferably, before the step S11, the method further includes:
and S10, controlling an auxiliary power supply to supply power to the BMS module.
Preferably, the step S13 further includes:
in the charging stage, recording battery voltage information and battery temperature information sent by a BMS module in real time;
in the standing stage, battery voltage information and battery temperature information sent by a BMS module are recorded in real time;
in the discharging stage, battery voltage information and battery temperature information sent by the BMS module are recorded in real time;
further, the step S15 includes:
and outputting the battery voltage information and the battery temperature information of each stage.
Preferably, in the step S13, the step of controlling the battery to enter the resting stage includes:
and controlling the battery to enter a standing stage with preset time, wherein the preset time is 5-60 minutes.
Preferably, in the step S14, the battery SOH is calculated according to the following formula:
wherein C is the calibration capacity, C0The rated capacity of the battery.
The invention also constructs a detection method of the battery SOH, when the electric automobile is connected with the DC gun of the charging and discharging equipment, the BMS module of the electric automobile carries out the following steps:
s21, performing handshake with the charge and discharge equipment;
s22, sending the rated capacity of the battery to the charging and discharging equipment;
step S23, controlling the battery to execute the calibration strategy according to the calibration strategy determined by the charging and discharging equipment, wherein the step of controlling the battery to execute the calibration strategy is as follows: firstly, controlling the battery to enter a charging stage until a charging cut-off condition is met, then controlling the battery to enter a standing stage, and finally controlling the battery to enter a discharging stage until the discharging cut-off condition is met, and acquiring the calibrated capacity of the battery in the discharging stage; or, the battery is controlled to enter a discharging stage until a discharging cut-off condition is met, then the battery is controlled to enter a standing stage, and finally the battery is controlled to enter a charging stage until the charging cut-off condition is met, and the calibrated capacity of the battery in the charging stage is obtained;
and S24, sending the acquired calibration capacity to charge and discharge equipment, so that the charge and discharge equipment calculates the battery SOH according to the battery rated capacity and the calibration capacity, and outputs the battery SOH.
The invention also constitutes a charging and discharging device comprising a first memory and a first processor for implementing the steps of the method for detecting battery SOH as described above when executing a computer program stored in said first memory.
The present invention also constructs an electric vehicle including a battery and a BMS module including a second memory and a second processor for implementing the steps of the method for detecting the SOH of the battery as described above when executing a computer program stored in the second memory.
The invention also constructs a detection system of the battery SOH, which comprises the charging and discharging equipment and the electric automobile.
By implementing the technical scheme of the invention, the whole electric automobile can be taken as a main body without returning the electric automobile to a factory or disassembling a power battery of the electric automobile, the battery of the electric automobile is controlled in three stages (for example, a charging stage, a standing stage and a discharging stage) by utilizing charging and discharging equipment, the calibration capacity of the battery in the third stage is obtained, and then the SOH value of the battery is calculated according to the calibration capacity and the rated capacity of the battery.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a first embodiment of a method for detecting SOH of a battery according to the present invention;
FIG. 2 is a flowchart illustrating a first embodiment of step S13 in FIG. 1;
FIG. 3 is a flowchart illustrating a second method for detecting SOH of a battery according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart of a first embodiment of a method for detecting a battery SOH according to the present invention, where the method for detecting a battery SOH according to the embodiment is applied to a charging and discharging device of an electric vehicle, and after the electric vehicle is connected to a dc gun of the charging and discharging device, that is, after the electric vehicle is physically connected to the charging and discharging device, the following steps are performed:
s11, receiving an SOH calibration starting instruction input by a user, and performing handshake with a BMS module of the electric automobile according to the starting instruction;
in this step, it should be noted that, in a practical application, the charging and discharging device may be provided at an after-sales service site of an electric vehicle, a charging and discharging site of a vehicle, or the like as a separate device for detecting the SOH value. In another practical application, the charging and discharging equipment can be arranged at a charging and discharging station of the electric automobile, and can be used for carrying out normal charging and discharging on the electric automobile and also can be used for detecting the SOH value of the electric automobile. In the practical application, two communication protocols are stored in the control module (monitoring unit) of the charging and discharging device and the BMS module of the electric vehicle, wherein the first communication protocol can be used for normal charging and discharging of the electric vehicle, and the second communication protocol can be used for SOH calibration of the battery of the electric vehicle, that is, the SOH value of the battery is detected. In addition, regarding the start instruction of SOH calibration, the user may input the start instruction by triggering a specific key arranged on the charging and discharging device, or may input the start instruction by triggering a specific virtual key in the mobile phone APP, or set the charging and discharging device, so that the charging and discharging device performs the SOH calibration process after receiving the start charging instruction input by the user, and performs the normal charging and discharging process after the SOH calibration process is finished.
Regarding the handshaking operation, it should be noted that, in addition to the mutual exchange of the id between the charging and discharging equipment and the BMS module, the method further includes: after the user selects the SOH calibration flow, the charging and discharging equipment determines the version number of the communication protocol corresponding to the SOH calibration flow and sends the version number to the BMS module of the electric automobile, so that the charging and discharging equipment and the BMS module can communicate with each other through the SOH calibration communication protocol.
S12, receiving the rated capacity of the battery sent by the BMS module; further, the maximum allowable charging voltage of the battery cells and the minimum allowable discharging voltage of the battery cells sent by the BMS module are also received;
in this step, after the handshake operation is performed, the charging and discharging device and the BMS module may perform SOH-calibrated parameter configuration operation with each other, specifically including charging parameter configuration and discharging parameter configuration of the battery, where the charging parameter configuration may be configured according to the content required by the national standard GB/T27930, for example, including: the charge and discharge device receives the battery rated capacity, the maximum allowable charge voltage of the battery cell, the maximum allowable charge current of the battery, the maximum allowable total charge voltage, the maximum allowable charge electric temperature from the BMS module, and transmits the remaining charge power, etc. to the BMS module. The discharge parameter configuration comprises the following steps: the charge and discharge device receives a battery rated capacity, a minimum allowable discharge voltage of the battery cell, a maximum allowable discharge current of the battery, a minimum allowable discharge total voltage, a maximum allowable discharge temperature from the BMS module, and transmits a remaining discharge power, etc. to the BMS module. In addition, regarding the maximum allowable charging voltage of the battery monomer, different types of batteries correspond to different values, for example, lithium iron phosphate is 3.7 +/-0.1V, ternary lithium is 4.2 +/-0.1V, lithium titanate is 2.8 +/-0.1V, and lithium manganate is 4.2 +/-0.1V; regarding the lowest allowable discharge voltage of the battery cell, different types of batteries also correspond to different values, for example, lithium iron phosphate is 2.5 ± 0.1V, ternary lithium is 2.7 ± 0.1V, lithium titanate is 1.6 ± 0.1V, and lithium manganate is 2.7 ± 0.1V.
S13, determining a calibration strategy and controlling the battery to execute the calibration strategy, wherein the step of controlling the battery to execute the calibration strategy is as follows: firstly, controlling the battery to enter a charging stage until a charging cut-off condition is met, then controlling the battery to enter a standing stage, and finally controlling the battery to enter a discharging stage until the discharging cut-off condition is met, and acquiring the calibrated capacity of the battery in the discharging stage; or, the battery is controlled to enter a discharging stage until a discharging cut-off condition is met, then the battery is controlled to enter a standing stage, and finally the battery is controlled to enter a charging stage until the charging cut-off condition is met, and the calibrated capacity of the battery in the charging stage is obtained;
in this step, the calibration strategy includes the following two strategies: charge-rest-discharge, or, discharge-rest-charge. Each calibration strategy comprises three stages, wherein in the standing stage, the current and the voltage output by a main power loop of the charge and discharge equipment to the battery are both 0. Preferably, the time of the standing stage can also be set, specifically, the battery is controlled to enter the standing stage with a preset time length, and the preset time length ranges from 5 minutes to 60 minutes, for example, standing for 20 minutes; in the charging stage or the discharging stage, the charging and discharging equipment can charge or discharge the power battery with a certain current, and the current is 0.1-2C for example0Wherein 0.1-2 is a charge/discharge rate, C0Is the rated capacity of the battery. In addition, when the battery is controlled to execute one of the calibration strategies, the calibration capacity of the battery in the third stage is also obtained, and if the third stage is a discharging stage, the obtained calibration capacity is the discharging capacity of the battery in the discharging stage; if the third stage is a charging stage, the acquired calibration capacity is the charging capacity of the battery in the charging stage.
S13, calculating the SOH of the battery according to the rated capacity and the calibration capacity of the battery;
in this step, the SOH of the battery may be calculated specifically according to the following formula:
wherein C is the calibration capacity, C0The rated capacity of the battery.
And S15, outputting the calculated SOH of the battery.
In this step, the calculated SOH of the battery may be output to the owner and/or the technician through a display screen of the charging and discharging device or the user APP or the background, so that the owner or the technician may analyze and evaluate the battery system of the electric vehicle. Further, the calculated SOH value may be transmitted to the BMS module so that the BMS module compares the self-estimated SOH value with the calculated SOH value to correct the estimated SOH value and calibrate the SOH estimation method thereof.
In an alternative embodiment, the charge cutoff condition is: the highest voltage of the battery monomer reaches the highest allowable charging voltage of the battery monomer; the discharge cutoff conditions were: the cell minimum voltage reaches the cell minimum allowable discharge voltage.
In another alternative embodiment, a charge cut-off voltage limit may be set according to the maximum allowable charge voltage of the battery cell, and a discharge cut-off voltage limit may be set according to the minimum allowable discharge voltage of the battery cell. Further, the charge cutoff conditions are: the highest voltage of the battery monomer reaches a charge cut-off voltage limit value; the discharge cutoff conditions were: the lowest voltage of the battery cell reaches the discharge cut-off voltage limit value.
Fig. 2 is a flowchart of a first embodiment of step S13 in fig. 1, in which step S13 specifically includes the following steps:
s131, acquiring the current SOC of the battery, judging whether the current SOC is greater than 50%, and if so, executing a step S132; if not, go to step S133;
step S132, controlling the battery to enter a charging stage until a charging cut-off condition is met, then controlling the battery to enter a standing stage, finally controlling the battery to enter a discharging stage until the discharging cut-off condition is met, acquiring the calibrated capacity of the battery in the discharging stage, and then executing step S14;
and S133, controlling the battery to enter a discharging stage until a discharging cut-off condition is met, then controlling the battery to enter a standing stage, finally controlling the battery to enter a charging stage until the charging cut-off condition is met, acquiring the calibrated capacity of the battery in the charging stage, and then executing S14.
By implementing the technical scheme of the embodiment, the current SOC of the battery is firstly acquired, the first calibration strategy (charging-standing-discharging) is executed when the current SOC is larger, and the second calibration strategy (discharging-standing-charging) is executed when the current SOC is smaller, so that the detection time of the SOH of the battery can be shortened as much as possible, and the unnecessary waiting time of a user is reduced.
In an optional embodiment, the charging and discharging device includes an auxiliary power source, and when the dc gun is plugged into the charging and discharging interface of the electric vehicle, the auxiliary power source is powered on and is controlled to supply power to the BMS module.
In an optional embodiment, when the calibration strategy is executed, no matter in the charging stage, the discharging stage or the standing stage, the charging and discharging equipment and the BMS module perform data communication in real time, and the charging and discharging equipment records the battery voltage information and the battery temperature information sent by the BMS module in real time so as to protect the battery of the detected vehicle in real time, prevent dangers of overdischarging, overcharging and the like of the battery in the detection process, and avoid causing further deterioration of the battery performance and safety accidents. It should be noted that, during the static stage, although the main power loop of the charging and discharging device stops outputting the current and voltage to the battery, the auxiliary power supply may still be used to continuously provide energy for the BMS module, so as to implement real-time communication between the charging and discharging device and the BMS module. In addition, in step S15, in addition to the calculated SOH of the battery, battery voltage information and battery temperature information at each stage are output, so that the user or a technician can analyze and evaluate the consistency of the battery cells and the temperature management level of the battery system, and better explain the result of SOH calibration.
Fig. 3 is a flowchart of a second embodiment of the method for detecting battery SOH according to the present invention, in which the method for detecting battery SOH according to the embodiment is applied to an electric vehicle, and after the electric vehicle is connected to a dc gun of a charging and discharging device, that is, after the electric vehicle is physically connected to the charging and discharging device, a BMS module of the electric vehicle performs the following steps:
s21, performing handshake with the charge and discharge equipment;
in this step, the handshake operation includes, in addition to the mutual exchange of the ids between the charging and discharging device and the BMS module, further: after the user selects the SOH calibration flow, the charging and discharging equipment determines the version number of the communication protocol corresponding to the SOH calibration flow and sends the version number to the BMS module of the electric automobile, so that the charging and discharging equipment and the BMS module can communicate with each other through the SOH calibration communication protocol.
S22, sending the rated capacity of the battery to the charging and discharging equipment; further, the highest allowable charging voltage of the battery cell and the lowest allowable discharging voltage of the battery cell are also sent;
in this step, after the handshake operation is performed, the charging and discharging device and the BMS module may perform SOH-calibrated parameter configuration operation with each other, specifically including charging parameter configuration and discharging parameter configuration of the battery, where the charging parameter configuration may be configured according to the content required by the national standard GB/T27930, for example, including: the charge and discharge device receives the battery rated capacity, the maximum allowable charge voltage of the battery cell, the maximum allowable charge current of the battery, the maximum allowable total charge voltage, the maximum allowable charge electric temperature from the BMS module, and transmits the remaining charge power, etc. to the BMS module. The discharge parameter configuration comprises the following steps: the charge and discharge device receives a battery rated capacity, a minimum allowable discharge voltage of the battery cell, a maximum allowable discharge current of the battery, a minimum allowable discharge total voltage, a maximum allowable discharge temperature from the BMS module, and transmits a remaining discharge power, etc. to the BMS module. In addition, regarding the maximum allowable charging voltage of the battery monomer, different types of batteries correspond to different values, for example, lithium iron phosphate is 3.7 +/-0.1V, ternary lithium is 4.2 +/-0.1V, lithium titanate is 2.8 +/-0.1V, and lithium manganate is 4.2 +/-0.1V; regarding the lowest allowable discharge voltage of the battery cell, different types of batteries also correspond to different values, for example, lithium iron phosphate is 2.5 ± 0.1V, ternary lithium is 2.7 ± 0.1V, lithium titanate is 1.6 ± 0.1V, and lithium manganate is 2.7 ± 0.1V.
S23, controlling the battery to execute a calibration strategy according to the calibration strategy determined by the charging and discharging equipment, wherein the step of controlling the battery to execute the calibration strategy is as follows: firstly, controlling the battery to enter a charging stage until a charging cut-off condition is met, then controlling the battery to enter a standing stage, and finally controlling the battery to enter a discharging stage until the discharging cut-off condition is met, and acquiring the calibrated capacity of the battery in the discharging stage; or, the battery is controlled to enter a discharging stage until a discharging cut-off condition is met, then the battery is controlled to enter a standing stage, and finally the battery is controlled to enter a charging stage until the charging cut-off condition is met, and the calibrated capacity of the battery in the charging stage is obtained;
in this step, the calibration strategy includes the following two strategies: charge-rest-discharge, or, discharge-rest-charge. Each calibration strategy comprises three stages, wherein in the standing stage, the current and the voltage output by a main power loop of the charge and discharge equipment to the battery are both 0. Preferably, the time of the standing stage can also be set, specifically, the battery is controlled to enter the standing stage with a preset time length, and the preset time length ranges from 5 minutes to 60 minutes, for example, standing for 20 minutes; in the charging stage or the discharging stage, the charging and discharging equipment can charge or discharge the power battery with a certain current, and the current is 0.1-2C for example0Wherein 0.1-2 is a charge/discharge rate, C0Is the rated capacity of the battery. In addition, when the battery is controlled to execute one of the calibration strategies, the calibration capacity of the battery in the third stage is also obtained, and if the third stage is a discharging stage, the obtained calibration capacity is the discharging capacity of the battery in the discharging stage; if the third stage is a charging stage, the acquired calibration capacity is the charging capacity of the battery in the charging stage.
And S24, sending the acquired calibration capacity to the charging and discharging equipment, so that the charging and discharging equipment calculates the SOH of the battery according to the rated capacity and the calibration capacity of the battery and outputs the SOH of the battery.
In this step, the charge and discharge device may calculate the SOH of the battery according to the following equation:
wherein C is the calibration capacity, C0The rated capacity of the battery.
Further, after the charging and discharging equipment calculates the SOH value of the battery, the calculated SOH value can be sent to the BMS module, so that the BMS module compares the SOH value estimated by the BMS module with the calculated value of the SOH, the estimated value of the SOH is corrected, and the SOH estimation method is calibrated.
The present invention also constitutes a charging and discharging device comprising a first memory and a first processor, wherein the first processor is adapted to implement the steps of the method for detecting SOH of a battery as applied in the charging and discharging device as described above when executing a computer program stored in the first memory.
The present invention also constructs an electric vehicle including a battery and a BMS module, and the BMS module includes a second memory and a second processor, wherein the second processor is configured to implement the steps of the method for detecting the SOH of the battery applied to the BMS module of the electric vehicle as described above when executing the computer program stored in the second memory.
The invention also constructs a detection system of the battery SOH, which comprises the charging and discharging equipment and the electric automobile.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. A method for detecting SOH of a battery is characterized in that after an electric automobile is connected to a direct current gun of charging and discharging equipment, the charging and discharging equipment carries out the following steps:
s11, receiving an SOH calibration starting instruction input by a user, and handshaking with a BMS module of the electric automobile according to the starting instruction;
s12, receiving the rated capacity of the battery sent by the BMS module;
s13, determining a calibration strategy, and controlling a battery to execute the calibration strategy, wherein the step of controlling the battery to execute the calibration strategy is as follows: firstly, controlling the battery to enter a charging stage until a charging cut-off condition is met, then controlling the battery to enter a standing stage, and finally controlling the battery to enter a discharging stage until the discharging cut-off condition is met, and acquiring the calibrated capacity of the battery in the discharging stage; or, the battery is controlled to enter a discharging stage until a discharging cut-off condition is met, then the battery is controlled to enter a standing stage, and finally the battery is controlled to enter a charging stage until the charging cut-off condition is met, and the calibrated capacity of the battery in the charging stage is obtained;
s14, calculating the SOH of the battery according to the rated capacity and the calibrated capacity of the battery;
s15, outputting the calculated SOH of the battery to enable the BMS module to correct the SOH estimated by the BMS module;
the step S13 includes:
s131, acquiring the current SOC of the battery, judging whether the current SOC is greater than 50%, and if so, executing a step S132; if not, go to step S133;
step S132, controlling the battery to enter a charging stage until a charging cut-off condition is met, then controlling the battery to enter a standing stage, finally controlling the battery to enter a discharging stage until the discharging cut-off condition is met, acquiring the calibrated capacity of the battery in the discharging stage, and then executing step S14;
and S133, controlling the battery to enter a discharging stage until a discharging cut-off condition is met, then controlling the battery to enter a standing stage, finally controlling the battery to enter a charging stage until the charging cut-off condition is met, acquiring the calibrated capacity of the battery in the charging stage, and then executing S14.
2. The method for detecting a SOH of a battery according to claim 1, further comprising, before said step S11:
and S10, controlling an auxiliary power supply to supply power to the BMS module.
3. The method for detecting a SOH of a battery according to claim 1, wherein the step S13 further includes:
in the charging stage, recording battery voltage information and battery temperature information sent by a BMS module in real time;
in the standing stage, battery voltage information and battery temperature information sent by a BMS module are recorded in real time;
in the discharging stage, battery voltage information and battery temperature information sent by the BMS module are recorded in real time;
further, the step S15 includes:
and outputting the battery voltage information and the battery temperature information of each stage.
4. The method for detecting the SOH of the battery according to claim 1, wherein in the step S13, the step of controlling the battery to enter a standing phase includes:
and controlling the battery to enter a standing stage with preset time, wherein the preset time is 5-60 minutes.
5. The method for detecting a battery SOH according to claim 1, wherein in said step S14, the battery SOH is calculated according to the following formula:
wherein C is the calibration capacity, C0The rated capacity of the battery.
6. A detection method for battery SOH is characterized in that after an electric automobile is connected with a direct current gun of charging and discharging equipment, a BMS module of the electric automobile carries out the following steps:
s21, performing handshake with the charge and discharge equipment;
s22, sending the rated capacity of the battery to the charging and discharging equipment;
step S23, controlling the battery to execute the calibration strategy according to the calibration strategy determined by the charging and discharging equipment, wherein the step of controlling the battery to execute the calibration strategy is as follows: firstly, controlling the battery to enter a charging stage until a charging cut-off condition is met, then controlling the battery to enter a standing stage, and finally controlling the battery to enter a discharging stage until the discharging cut-off condition is met, and acquiring the calibrated capacity of the battery in the discharging stage; or, the battery is controlled to enter a discharging stage until a discharging cut-off condition is met, then the battery is controlled to enter a standing stage, and finally the battery is controlled to enter a charging stage until the charging cut-off condition is met, and the calibrated capacity of the battery in the charging stage is obtained;
s24, sending the acquired calibration capacity to charge and discharge equipment so that the charge and discharge equipment can calculate the SOH of the battery according to the rated capacity and the calibration capacity of the battery and output the SOH of the battery, and the BMS module can correct the estimated SOH of the BMS module;
furthermore, in step S23, the method for controlling the battery to execute the calibration strategy includes:
if the current SOC of the battery is more than 50%, the battery is controlled to enter a charging stage firstly until a charging stop condition is met, then the battery is controlled to enter a standing stage, and finally the battery is controlled to enter a discharging stage until the discharging stop condition is met, and the calibrated capacity of the battery in the discharging stage is obtained;
if the current SOC of the battery is not more than 50%, the battery is controlled to enter a discharging stage until a discharging cut-off condition is met, then the battery is controlled to enter a standing stage, finally the battery is controlled to enter a charging stage until the charging cut-off condition is met, and the calibrated capacity of the battery in the charging stage is obtained.
7. A charging and discharging device comprising a first memory and a first processor, characterized in that the first processor is adapted to carry out the steps of the method for detecting SOH of a battery according to any one of claims 1-5 when executing a computer program stored in the first memory.
8. An electric vehicle comprising a battery and a BMS module, the BMS module comprising a second memory and a second processor, characterized in that the second processor is adapted to carry out the steps of the method for detecting SOH of a battery according to claim 6 when executing a computer program stored in the second memory.
9. A detection system of a battery SOH, characterized by comprising the charging and discharging device according to claim 7 and the electric vehicle according to claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810474575.5A CN108550928B (en) | 2018-05-17 | 2018-05-17 | Electric automobile, charging and discharging equipment, and method and system for detecting SOH of battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810474575.5A CN108550928B (en) | 2018-05-17 | 2018-05-17 | Electric automobile, charging and discharging equipment, and method and system for detecting SOH of battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108550928A CN108550928A (en) | 2018-09-18 |
| CN108550928B true CN108550928B (en) | 2020-04-07 |
Family
ID=63495050
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810474575.5A Active CN108550928B (en) | 2018-05-17 | 2018-05-17 | Electric automobile, charging and discharging equipment, and method and system for detecting SOH of battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108550928B (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109546704B (en) * | 2018-11-29 | 2021-08-24 | 安徽江淮汽车集团股份有限公司 | Power battery quick charging method |
| CN111781502B (en) * | 2019-04-04 | 2022-01-21 | 宁德时代新能源科技股份有限公司 | Battery detection method and device for electric automobile and detection equipment |
| CN110133535B (en) * | 2019-06-21 | 2022-04-08 | 阳光电源股份有限公司 | SOH value determination method and device of battery system |
| CN110361664A (en) * | 2019-08-23 | 2019-10-22 | 清华四川能源互联网研究院 | Battery detection method, battery monitoring device and charging equipment |
| CN110780209B (en) * | 2019-11-27 | 2021-12-17 | 深圳市科陆电子科技股份有限公司 | BMS battery capacity calibration method |
| CN110865309A (en) * | 2019-11-28 | 2020-03-06 | 桑顿新能源科技有限公司 | Power battery capacity detection method and system |
| CN111900774B (en) * | 2020-07-24 | 2022-01-25 | 博众精工科技股份有限公司 | Energy scheduling method |
| CN112213643B (en) * | 2020-09-30 | 2023-06-23 | 蜂巢能源科技有限公司 | Method, system and equipment for predicting initial capacity and state of health of battery |
| CN114236406A (en) * | 2021-12-15 | 2022-03-25 | 湖北德普电气股份有限公司 | Feedback type power battery charging and discharging detection system |
| CN116868072A (en) * | 2022-06-28 | 2023-10-10 | 宁德时代新能源科技股份有限公司 | Battery SOH detection method, device, equipment and storage medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105607004B (en) * | 2014-11-20 | 2018-07-17 | 北京普莱德新能源电池科技有限公司 | A kind of lithium ion battery packet health state evaluation method and system |
| CN105068008B (en) * | 2015-07-14 | 2018-10-19 | 南京航空航天大学 | The battery charge state method of estimation of battery parameter is recognized using Vehicular charger |
| CN105785275A (en) * | 2016-03-08 | 2016-07-20 | 西安特锐德智能充电科技有限公司 | Battery SOH testing device based on charger and method for testing battery SOH |
| CN106505662A (en) * | 2016-11-03 | 2017-03-15 | 上海理工大学 | Demarcate charging device and the method for work of batteries of electric automobile pool-size |
| CN106646261A (en) * | 2017-01-03 | 2017-05-10 | 重庆长安汽车股份有限公司 | Accuracy verification method and accuracy verification system for SOC of battery management system |
-
2018
- 2018-05-17 CN CN201810474575.5A patent/CN108550928B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108550928A (en) | 2018-09-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108550928B (en) | Electric automobile, charging and discharging equipment, and method and system for detecting SOH of battery | |
| KR102179677B1 (en) | Apparatus and method for calculating soc | |
| CN110011374B (en) | Control method and system for battery charging and discharging current and terminal equipment | |
| CN107576918B (en) | Method and system for estimating residual electric quantity of lithium battery | |
| WO2017016385A1 (en) | Estimation method and apparatus for state-of-charge value of battery | |
| CN107356874B (en) | Estimation method, device and system for state of charge of battery pack | |
| WO2015106691A1 (en) | Soc estimation method for power battery for hybrid electric vehicle | |
| US11982720B2 (en) | Method and battery management system for ascertaining a state of health of a secondary battery | |
| WO2018214266A1 (en) | Battery pack peak power estimation method, device, and system | |
| CN101966820A (en) | On-line monitoring method for self-adaptively correcting lithium ion battery state-of-charge | |
| CN111416397B (en) | Battery equalization method and device, control equipment and computer readable storage medium | |
| US20230347785A1 (en) | Consistency evaluation method for vehicle battery cell, device, equipment and storage medium | |
| CN107942261B (en) | Method and system for estimating state of charge of battery | |
| US11440433B2 (en) | Method for determining a state-of-charge operating window of a battery | |
| JP6970289B2 (en) | Charge control devices, transportation equipment, and programs | |
| CN108583305B (en) | Charging precision diagnosis method, device and chip | |
| CN110210147B (en) | Simulation device and simulation method for estimating battery health state | |
| EP4152022B1 (en) | Method for determining full-charge capacity of battery pack, method for determining state of health of battery pack, system, and apparatus | |
| CN113406523A (en) | Energy storage battery state evaluation method and device, electronic equipment and storage system | |
| CN114609530A (en) | Method, device, equipment and medium for correcting battery state of charge | |
| CN116819346B (en) | Battery SOC estimation method, device, equipment and storage medium | |
| CN115113049A (en) | Method for determining initial value of battery SOC and related device | |
| US11505088B2 (en) | Vehicle and control method thereof | |
| CN115113061A (en) | Method and related device for correcting SOC of battery | |
| CN117347888B (en) | Battery equalizer load measuring method and device, computer equipment and storage medium |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20191225 Address after: 266000 Shandong Province, Qingdao city Laoshan District Songling Road No. 336 Applicant after: Qingdao teltel New Energy Technology Co.,Ltd. Applicant after: XI'AN TGOOD INTELLIGENT CHARGING TECHNOLOGY Co.,Ltd. Address before: 266000 Shandong Province, Qingdao city Laoshan District Songling Road No. 336 Applicant before: QINGDAO TGOOD ELECTRIC Co.,Ltd. Applicant before: XI'AN TGOOD INTELLIGENT CHARGING TECHNOLOGY Co.,Ltd. |
|
| TA01 | Transfer of patent application right | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20201218 Address after: Room 1001, 10th floor, no.336, Songling Road, Laoshan District, Qingdao City, Shandong Province 266000 Patentee after: Qingdao teltel New Energy Technology Co.,Ltd. Patentee after: Xi'an teride lingchong New Energy Technology Co.,Ltd. Patentee after: XI'AN TGOOD INTELLIGENT CHARGING TECHNOLOGY Co.,Ltd. Address before: 266000 No. 336 Songling Road, Laoshan District, Qingdao City, Shandong Province Patentee before: Qingdao teltel New Energy Technology Co.,Ltd. Patentee before: Xi'an TGOOD Intelligent Charging Technology Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Room 1001, 10th floor, no.336, Songling Road, Laoshan District, Qingdao City, Shandong Province 266000 Patentee after: Qingdao teltel New Energy Technology Co.,Ltd. Patentee after: Xi'an telingchong New Energy Technology Co.,Ltd. Patentee after: Xi'an Telai Intelligent Charging Technology Co.,Ltd. Address before: Room 1001, 10th floor, no.336, Songling Road, Laoshan District, Qingdao City, Shandong Province 266000 Patentee before: Qingdao teltel New Energy Technology Co.,Ltd. Patentee before: Xi'an teride lingchong New Energy Technology Co.,Ltd. Patentee before: XI'AN TGOOD INTELLIGENT CHARGING TECHNOLOGY Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP01 | Change in the name or title of a patent holder |
Address after: Room 1001, 10th floor, no.336, Songling Road, Laoshan District, Qingdao City, Shandong Province 266000 Patentee after: Qingdao teltel New Energy Technology Co.,Ltd. Patentee after: Xi'an Lingchong Infinite New Energy Technology Co.,Ltd. Patentee after: Xi'an Telai Intelligent Charging Technology Co.,Ltd. Address before: Room 1001, 10th floor, no.336, Songling Road, Laoshan District, Qingdao City, Shandong Province 266000 Patentee before: Qingdao teltel New Energy Technology Co.,Ltd. Patentee before: Xi'an telingchong New Energy Technology Co.,Ltd. Patentee before: Xi'an Telai Intelligent Charging Technology Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder |