CN110865309A - Power battery capacity detection method and system - Google Patents
Power battery capacity detection method and system Download PDFInfo
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- CN110865309A CN110865309A CN201911192199.1A CN201911192199A CN110865309A CN 110865309 A CN110865309 A CN 110865309A CN 201911192199 A CN201911192199 A CN 201911192199A CN 110865309 A CN110865309 A CN 110865309A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
Abstract
The invention relates to a power battery capacity detection method and a power battery capacity detection system. A power battery capacity detection method comprises the following steps: s1, connecting the battery to a charging and discharging device, configuring and executing a real vehicle charging and discharging message for the charging and discharging device; s2, detecting the battery state of a battery, executing a charging program according to the battery state and the charging current standard in the charging message in the real vehicle charging and discharging message until the voltage fed back by the battery is the charging cut-off voltage, and calculating the total charging capacity; and S3, detecting the battery state of the battery, executing a discharging program according to the battery state and the discharging current standard in the discharging message in the real vehicle charging and discharging message until the voltage fed back by the battery is the discharging cut-off voltage, and calculating the available total capacity. In the process of measuring the total capacity of the power battery, the method configures charge and discharge messages in the actual vehicle using process for the charge and discharge device, and then performs charge and discharge tests according to the charge and discharge messages.
Description
Technical Field
The invention relates to the field of battery detection, in particular to a power battery capacity detection method and system.
Background
In view of the serious damage to the environment and the gradual exhaustion of fossil energy in the human society at present, in order to improve the current situation, various countries in the world begin to limit the manufacture and use of fuel vehicles, and new energy vehicles are vigorously developed. In new energy, the performance of the power battery is outstanding, so that the application of the power battery is extremely wide in the field of new energy automobiles, but before the new energy automobiles are put into use, various performance indexes of a battery system need to be verified.
In the use process of the new energy automobile, a new energy automobile owner can pay attention to the capacity of the battery of the new energy automobile as if the fuel oil automobile owner pays attention to the size of the fuel tank, after all, the capacity of the battery can directly influence the endurance mileage of the automobile (although the owner can know the endurance mileage of the automobile when purchasing the automobile certainly), but if the available capacity of the power battery is the theoretical capacity when leaving the factory, the actual available capacity needs to be considered because the available capacity is not used according to the use condition of the real automobile.
For the user, the data of the current performance situation of the battery system, namely the available capacity of the battery system, is most intuitively represented by the battery system. The available capacity of the battery system at the same ambient temperature is greatly influenced by different charging and discharging modes, and errors of detection data and actual use conditions are further aggravated. When the whole vehicle is used, charging and discharging are related to the instant voltage, SOC and temperature of the battery system. The charging and discharging strategies of the whole vehicle are different, and the current or power values required by charging and discharging are different, namely the current/power values of the charging or discharging of the whole vehicle are different under the condition that the battery is at different temperatures under the same voltage or SOC due to the individual difference of the battery system. The temperature of the battery system cannot be estimated under a certain voltage and a certain SOC value of the battery in the charging and discharging process, and the battery pack cannot be charged and discharged in a preset mode.
Patent No. ZL 201710767517.7 discloses a method for detecting the capacity of a lithium battery, which provides a method for detecting the capacity of a lithium battery, comprising: estimating the initial capacity of a lithium battery by an open-circuit voltage method; after the initial capacity of the lithium battery is obtained, calculating the consumed or supplemented capacity of the lithium battery by combining a temperature factor and a current change factor by a coulomb integration method so as to obtain the current actual capacity of the lithium battery; and converting the current actual capacitance into the current display capacitance by a compensation calculation method. The calculation of the available total capacity of the battery, which is obtained by a compensation algorithm, has certain defects.
The invention belongs to the technical field of measurement, and relates to a method for detecting available capacity. The method better simulates the charge and discharge mode of the battery system in the actual use process of the vehicle, and accordingly, the available capacity of the battery system in the actual use process can be reflected more visually through the test of the battery system.
Therefore, the invention is provided for improving the accuracy of the available capacity test of the battery system.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a method and a system for detecting the capacity of a power battery, which can accurately simulate the charging and discharging behavior of the battery during the use of a real vehicle, thereby determining the total available capacity of the real vehicle.
In order to achieve the purpose, the invention adopts the following technical scheme:
a power battery capacity detection method comprises the following steps:
s1, connecting the battery to a charging and discharging device, configuring and executing a real vehicle charging and discharging message for the charging and discharging device;
s2, detecting the battery state of a battery, executing a charging program according to the battery state and the charging current standard in the charging message in the real vehicle charging and discharging message until the voltage fed back by the battery is the charging cut-off voltage, and calculating the total charging capacity;
and S3, detecting the battery state of the battery, executing a discharging program according to the battery state and the discharging current standard in the discharging message in the real vehicle charging and discharging message until the voltage fed back by the battery is the discharging cut-off voltage, and calculating the available total capacity.
Preferably, in the method for detecting the capacity of the power battery, the real vehicle charging and discharging message is a charging and discharging message generated by recording current values of the power battery during charging and discharging according to different battery states during the use of the real vehicle.
In the power battery capacity detection method, the battery state includes an SOC value, a voltage value, and a battery temperature.
Preferably, in the method for detecting the capacity of the power battery, the total charging capacity is a total electric quantity output to the battery system by the charging and discharging device.
Preferably, in the power battery capacity detection system, the available total capacity is the total electric quantity received by the charging and discharging device in the discharging process of the battery system.
Preferably, in the power battery capacity detection system, the charge cut-off voltage is a rated voltage of the battery.
Preferably, in the power battery capacity detection system, the discharge cut-off voltage is determined according to a battery core of the battery.
A power battery capacity detection system used for the power battery capacity detection method, comprising: the device comprises a controller, an input module, a charging and discharging device and a detection module;
the input module is used for inputting the real vehicle charging and discharging message into the controller;
the detection module is used for detecting the battery state of the battery to be detected;
and the charging and discharging device is used for executing a charging/discharging test according to the instruction of the controller and feeding back a charging amount to the controller.
Preferably, the input module of the power battery capacity detection system is further configured to set a charge cut-off voltage and a discharge cut-off voltage of the battery to be detected.
The preferable power battery capacity detection system further comprises a CAN communication module for external communication.
Compared with the prior art, according to the power battery capacity detection method and system provided by the invention, in the process of measuring the total capacity of the power battery, the charge and discharge messages in the actual use process of the vehicle are configured for the charge and discharge device, then the charge and discharge test is carried out according to the charge and discharge messages, and the total charge capacity and the total available capacity of the detected battery are respectively obtained according to the output and input electric quantity of the charge and discharge device.
Drawings
FIG. 1 is a flow chart of a method for detecting power battery capacity according to the present invention;
FIG. 2 is a block diagram of a power battery capacity detection system according to the present invention;
fig. 3 is a table of charging messages in example 2 provided by the present invention;
fig. 4 is a table of discharge messages in example 2 provided by the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
The invention provides a power battery capacity detection method, which comprises the following steps:
s1, connecting the battery to a charging and discharging device, configuring and executing a real vehicle charging and discharging message for the charging and discharging device;
s2, detecting the battery state of a battery, executing a charging program according to the battery state and the charging current standard in the charging message in the real vehicle charging and discharging message until the voltage fed back by the battery is the charging cut-off voltage, and calculating the total charging capacity;
and S3, detecting the battery state of the battery, executing a discharging program according to the battery state and the discharging current standard in the discharging message in the real vehicle charging and discharging message until the voltage fed back by the battery is the discharging cut-off voltage, and calculating the available total capacity.
Correspondingly, the invention also provides a power battery capacity detection system for the power battery capacity detection method, which comprises the following steps: the device comprises a controller 1, an input module 2, a charging and discharging device 3 and a detection module 4;
the input module 2 is used for inputting real vehicle charging and discharging messages into the controller 1;
the detection module 4 is used for detecting the battery state of the battery to be detected;
the charging and discharging device 3 is configured to perform a charging/discharging test according to an instruction of the controller 1, and feed back a charged amount to the controller 1.
Specifically, the charging and discharging device 3 is connected with a battery to be detected, so that the battery can be charged and discharged under the control of the charging and discharging device 3, and at this time, the detection module 4 has a function of managing a battery state of a vehicle-mounted battery management system, is also connected with the battery, detects the battery state of the battery in real time, and transmits detection data to the controller 1 in real time. Inputting a real vehicle charging and discharging message into the controller 1, and sending a driving instruction to the charging and discharging device 3 by the controller 1; firstly, performing a charging test to obtain the maximum charging capacity of the battery, detecting the instant battery state of the battery, matching a charging strategy in a real vehicle charging message in the real vehicle charging and discharging message according to the battery state of the battery, controlling the charging and discharging device 3 to perform the real vehicle charging test on the battery, stopping the charging test when detecting that the feedback voltage of the battery is a charging cut-off voltage, and further enabling the charging and discharging device 3 to obtain the specific electric quantity finally charged for the battery and input the specific electric quantity into the controller 1; then, a discharge test is carried out to obtain the maximum discharge capacity which can be used by the battery, the battery state of the battery is detected again, the controller 1 matches a discharge strategy in an actual vehicle discharge message in the actual vehicle discharge message according to the battery state, the charge and discharge device 3 is controlled to carry out the actual vehicle discharge test on the battery, when the feedback voltage of the battery is detected to be the discharge cut-off voltage, the charge and discharge device 3 further obtains the maximum discharge capacity which can be used under the condition that the battery is finally used in the actual vehicle, and the calculation data is input into the controller 1.
Preferably, when the battery is a single battery, the battery can be directly connected to the charge/discharge device 3, however, in the process of using the power battery at ordinary times, the power battery is often provided with a separate battery management system, when a power battery with a battery management system is to be detected, the output and input of the battery management system are always connected to the charging and discharging device 3, a Controller Area Network (CAN) bus of the battery management system is connected to the Controller 1, the battery state of the power battery is sent to the Controller 1, and the detection module 4 does not work, a charging strategy or a discharging strategy is transmitted to the battery management system through the charging and discharging device 3, the battery management system controls the power battery to cooperate with the charging and discharging device 3 to perform charging and discharging tests.
Preferably, in this embodiment, the real vehicle charging and discharging message is a charging and discharging message generated by recording current values of the power battery during charging and discharging according to different battery states during use of the real vehicle. The real vehicle obtaining the real vehicle charging and discharging message is a general vehicle of a vehicle type to be provided with the power battery, and used charging and discharging records are formed after being arranged on the basis of being stably used for a period of time.
Preferably, in this embodiment, the battery state includes an SOC value, a voltage value, and a battery temperature. The detection of the battery state is to perform real-time matching of the charging current value for the charging and discharging test of the battery, because the battery state needs to be detected at different battery temperatures and different battery feedback voltages (the feedback voltage is the external voltage of the battery), so that the detection of the battery state can be finally determined, for example, before the charging test, when part of electric quantity exists in the battery, the electric quantity in the battery needs to be rapidly output; before the discharge test, when the battery capacity is not 100%, the battery capacity needs to be charged to 100%.
Preferably, in this embodiment, the total charging capacity is a total amount of electricity output to the battery system by the charging and discharging device 3. When the total charging capacity is measured, a charging test is carried out on the battery by using the standard of the real vehicle charging message, and the finally charged electric quantity is measured to be used as the total charging capacity.
Preferably, in this embodiment, the available total capacity is a total amount of power received by the charging and discharging device 3 during the discharging process of the battery system. When the total discharge capacity is measured, the discharge electric test is carried out on the battery by using the standard of a real vehicle discharge message, and the sum of electric quantities finally entering the charge and discharge device 3 is measured to be used as the total discharge capacity.
Preferably, in this embodiment, the charge cut-off voltage is a rated voltage of the battery. When it is verified that the battery is fully charged when the feedback voltage of the battery is the rated voltage, the charging may be stopped and the final total amount of charge may be fed back to the controller 1.
Preferably, in this embodiment, the discharge cutoff voltage is determined according to a battery core of the battery. In the use process of the battery, part of electric quantity is reserved in the battery finally to ensure that the battery is not damaged, but the lowest electric quantity of each battery is determined according to the feedback voltage, and the lowest electric quantity can be determined after the electric core is produced.
Preferably, in this embodiment, the input module 2 is further configured to set a charge cut-off voltage and a discharge cut-off voltage of the battery to be tested.
As a preferable scheme, in this embodiment, the system further includes a CAN communication module for external communication.
Example 2
The method comprises the steps that the available capacity of a certain power battery at the ambient temperature of 25 ℃ is tested, real vehicle charging and discharging message data of a real vehicle provided with the power battery in the using process are led into a controller 1, the controller 1 drives a charging and discharging device 3 to perform charging test and discharging test on the power battery to be detected according to the real vehicle charging and discharging messages, and the maximum chargeable capacity and the maximum discharging capacity of the power battery are obtained respectively.
The real vehicle charging and discharging messages comprise real vehicle charging messages and real vehicle discharging messages. The real vehicle charging message is shown in fig. 3, and the real vehicle discharging message is shown in fig. 4. The real vehicle charging and discharging message provided by the embodiment is only a record of a current value during charging and discharging in a using process of a vehicle using the power battery in one vehicle type of a new energy vehicle. Where NA is a section following value, for example, in the case where the battery temperature is 15 ℃, it is performed at a charging current value lower in a section of 10 ℃ to 20 ℃, that is, with an operating current at a battery temperature of 10 ℃.
After a charge-discharge test at an ambient temperature of 25 ℃, the total charge capacity is obtained as follows: 132.263Ah, total available capacity: 132.064 Ah.
By using the method, the calculation process is omitted, the charging and discharging simulation detection is only needed to be carried out according to the charging and discharging message record of the real vehicle, the charging and discharging device 3 calculates the output and input electric quantity, the charging total capacity and the available total capacity of the battery can be obtained, the method is convenient and rapid, and the method is in accordance with the real situation of the real vehicle.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (10)
1. A power battery capacity detection method is characterized by comprising the following steps:
s1, connecting the battery to a charging and discharging device, configuring and executing a real vehicle charging and discharging message for the charging and discharging device;
s2, detecting the battery state of a battery, executing a charging program according to the battery state and the charging current standard in the charging message in the real vehicle charging and discharging message until the voltage fed back by the battery is the charging cut-off voltage, and calculating the total charging capacity;
and S3, detecting the battery state of the battery, executing a discharging program according to the battery state and the discharging current standard in the discharging message in the real vehicle charging and discharging message until the voltage fed back by the battery is the discharging cut-off voltage, and calculating the available total capacity.
2. The power battery capacity detection method according to claim 1, wherein the real vehicle charge/discharge message is a charge/discharge message generated by recording current values of the power battery during charging and discharging according to different battery states during use of the real vehicle.
3. The power battery capacity detection method according to claim 2, wherein the battery state includes an SOC value, a voltage value, and a battery temperature.
4. The power battery capacity detection method according to claim 1, wherein the total charging capacity is a total amount of electricity output from the charging and discharging device to the battery system.
5. The power battery capacity detection system of claim 1, wherein the total available capacity is a total amount of power received by the charge and discharge device during discharge of the battery system.
6. The power battery capacity detection system of claim 1, wherein the charge cutoff voltage is a rated voltage of the battery.
7. The power battery capacity detection system of claim 1, wherein the discharge cutoff voltage is determined in accordance with a cell of a battery.
8. A power battery capacity detection system used in the power battery capacity detection method according to any one of claims 1 to 7, comprising: the device comprises a controller, an input module, a charging and discharging device and a detection module;
the input module is used for inputting the real vehicle charging and discharging message into the controller;
the detection module is used for detecting the battery state of the battery to be detected;
and the charging and discharging device is used for executing a charging/discharging test according to the instruction of the controller and feeding back a charging amount to the controller.
9. The power battery capacity detection system of claim 8, wherein the input module is further configured to set a charge cut-off voltage and a discharge cut-off voltage of the battery under test.
10. The power battery capacity detection system of claim 8, further comprising a CAN communication module for external communication.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111999652A (en) * | 2020-07-22 | 2020-11-27 | 济南浪潮高新科技投资发展有限公司 | Method, device, equipment and medium for testing and recording charge and discharge of battery |
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