CN113848488B - Method, device and storage medium for measuring and calculating attenuation degree of battery charging power - Google Patents
Method, device and storage medium for measuring and calculating attenuation degree of battery charging power Download PDFInfo
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- CN113848488B CN113848488B CN202111124512.5A CN202111124512A CN113848488B CN 113848488 B CN113848488 B CN 113848488B CN 202111124512 A CN202111124512 A CN 202111124512A CN 113848488 B CN113848488 B CN 113848488B
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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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/005—Detection of state of health [SOH]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
- H02J7/007182—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters in response to battery voltage
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Abstract
The invention discloses a method, equipment and a computer-readable storage medium for measuring and calculating the attenuation degree of battery charging power, wherein the method comprises the following steps: charging the battery to be tested with a constant preset excitation current after the electric quantity of the battery to be tested is exhausted, obtaining a stable open-circuit voltage after stopping charging and standing for a preset standing time, and comparing the absolute value of the difference value of the stable open-circuit voltage and the preset target voltage with a preset difference value; if the voltage is smaller than the preset difference value, acquiring a stable open-circuit voltage as a first open-circuit voltage, charging the battery to be tested for a preset excitation time with a constant preset excitation current, and acquiring the charged excitation open-circuit voltage as a second open-circuit voltage; and after the charging internal resistance is calculated according to the preset excitation current and the first and second open-circuit voltages, the charging power attenuation degree of the battery to be tested is calculated based on the average charging internal resistance obtained by repeatedly testing the battery to be tested. Therefore, the battery charging power attenuation measurement with low cost and high efficiency is achieved.
Description
Technical Field
The present invention relates to the field of measurement and calculation of battery charging power attenuation, and in particular, to a method and apparatus for measuring and calculating battery charging power attenuation, and a computer readable storage medium.
Background
The performance attenuation degree of the power battery of the electric automobile is a very focused problem for users, although the national quality assurance of the electric automobile requires that the performance attenuation degree of the power battery of the electric automobile is not lower than 20% in 8 years, the performance attenuation degree test of the power battery of the electric automobile in the industry is basically realized by depending on a charging and discharging machine at present, and the cost of one charging and discharging machine is hundreds of thousands to millions of yuan or more, and an automobile maintenance factory, a 4S shop and a common testing mechanism cannot bear the performance attenuation degree. In addition, one charging and discharging machine can only test one electric automobile, and the test efficiency is quite low. For electric automobile users, the attenuation degree of the power battery is tested by utilizing the charging and discharging motor, and the high testing cost is difficult to bear, so that the development of a simple and effective electric automobile power battery performance attenuation model is necessary.
According to the invention, the charging process of the electric automobile is designed, the parameters in the charging process are collected and analyzed, and the charging power attenuation performance of the power battery of the electric automobile can be rapidly evaluated by using the onboard charging gun of the electric automobile or the public charging pile to perform charging test on the electric automobile.
Disclosure of Invention
The invention mainly aims to provide a method for measuring and calculating the attenuation degree of battery charging power, which aims to solve the technical problems of high cost and low efficiency in the prior art for measuring and calculating the attenuation degree of battery charging power.
In order to achieve the above object, the present invention provides a method for measuring and calculating a battery charging power attenuation degree, the method for measuring and calculating a battery charging power attenuation degree comprising:
when a measurement request of the attenuation degree of the charging power is detected, determining a battery to be tested;
executing a multi-time charging internal resistance measuring and calculating process of two stages on the battery to be tested to obtain average charging internal resistances corresponding to the two stages of the battery to be tested;
obtaining the attenuation degree of the charging power of the battery to be tested according to the average charging internal resistance of the two stages;
the charging internal resistance measuring and calculating process comprises the following steps:
depleting the electric quantity of a battery to be tested, charging the battery to be tested with a constant preset excitation current, stopping charging when the open-circuit voltage of the battery to be tested reaches a preset target voltage, obtaining a stable open-circuit voltage which is kept unchanged after standing for a preset standing time and within a preset stable time, and comparing the absolute value of the difference value between the stable open-circuit voltage and the preset target voltage with a preset difference value;
if the voltage is smaller than the preset difference value, acquiring the stable open-circuit voltage as a first open-circuit voltage, charging the battery to be tested for a preset excitation time with a constant preset excitation current, and acquiring the charged excitation open-circuit voltage as a second open-circuit voltage;
and calculating to obtain the charging internal resistance according to the preset exciting current, the first open-circuit voltage and the second open-circuit voltage.
Optionally, after the step of comparing the absolute value of the difference between the stable open-circuit voltage and the preset target voltage with the preset difference, the method further includes:
if the difference is larger than the preset difference, the stable open-circuit voltage of the battery to be tested is charged to the preset target voltage with constant preset supplementary current until the charging is stopped and the battery is kept still for the preset standing time, and the absolute value of the difference between the stable open-circuit voltage and the preset target voltage which are kept unchanged in the preset stable time is smaller than the preset difference.
Optionally, the step of calculating the internal charging resistance according to the preset excitation current, the first open-circuit voltage and the second open-circuit voltage includes:
if the preset excitation current, the first open circuit voltage and the second open circuit voltage are I, U and U2 respectively, the internal charging resistance r= (U2-U1)/I is set.
Optionally, the step of obtaining the attenuation degree of the charging power of the battery to be tested according to the average charging internal resistance of the two stages includes:
and if the average internal charging resistance of the first stage is Ravg1 and the average internal charging resistance of the second stage is Ravg2, the charging power attenuation degree phi=1- (Ravg 1/Ravg 2) of the battery to be tested.
Optionally, the step of determining the battery to be tested includes:
the method comprises the steps of obtaining the number of strings of battery cells in a battery pack of a battery to be tested and the string open-circuit voltage of each string of battery cells, and obtaining a preset target voltage based on the number of strings of battery cells and the string open-circuit voltage of each string of battery cells.
Optionally, each string of cells has a minimum string open-circuit voltage and a maximum string open-circuit voltage, and the step of obtaining the preset target voltage based on the string number of the cells and the string open-circuit voltage of each string of cells includes:
obtaining the minimum value of the rated voltage interval of the battery to be tested based on the number of battery strings and the minimum string open-circuit voltage of each string of battery cells, obtaining the maximum value of the rated voltage interval of the battery to be tested based on the number of battery strings and the maximum string open-circuit voltage of each string of battery cells, and obtaining the preset target voltage based on the rated voltage interval.
Optionally, the step of obtaining the preset target voltage based on the rated voltage interval includes:
after the rated voltage interval is obtained, equally dividing the rated voltage interval into voltage segments with preset segment numbers, and obtaining standby target voltages of all the voltage segments to serve as preset target voltages;
in each of the internal resistance measurement flows, before the step of charging the battery to be tested with a constant preset excitation current, the method further includes:
and selecting one of the standby target voltages of each voltage section as a preset target voltage used in the current internal resistance charging measurement process.
Optionally, after the step of testing the preset target voltages based on the voltage segments to obtain the internal charging resistances of the voltage segments, the method further includes:
and measuring the charging internal resistance of each voltage segment based on the preset target voltage of each voltage segment, and obtaining the average charging internal resistance of the battery to be tested by combining the preset segment number.
In addition, in order to achieve the above object, the present invention also provides a device for measuring and calculating a battery charging power attenuation degree, the device for measuring and calculating a battery charging power attenuation degree including: the method comprises the steps of a memory, a processor and a battery charging power attenuation degree measuring program which is stored in the memory and can run on the processor, wherein the battery charging power attenuation degree measuring program is executed by the processor to realize the battery charging power attenuation degree measuring method.
In addition, in order to achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon a program for measuring the degree of attenuation of battery charging power, which when executed by a processor, implements the steps of the method for measuring the degree of attenuation of battery charging power as described above.
According to the method, the device and the computer readable storage medium for measuring and calculating the attenuation degree of the battery charging power, the battery to be tested which is used for exhausting electric quantity is rapidly charged to the open-circuit voltage which is close to the preset target voltage by using the preset rapid charging exciting current, after the charging and standing are stopped, if the absolute value of the difference value between the stabilized open-circuit voltage and the preset target voltage is larger than the preset difference value, the battery to be tested is slowly and additionally charged by using the slow charging current until the absolute value of the difference value between the stabilized open-circuit voltage and the preset target voltage is smaller than the preset difference value, and the open-circuit voltage of which the absolute value of the difference value is smaller than the preset difference value is taken as the first open-circuit voltage. And charging the preset quick charge excitation current of the excitation time based on the first open circuit voltage, wherein the open circuit voltage after the quick charge is used as the second open circuit voltage. And obtaining the charging internal resistance according to the preset excitation current, the first open-circuit voltage and the second open-circuit voltage, and obtaining the average charging internal resistance through repeated tests. The battery to be tested is continuously charged and discharged, the internal resistance of the battery is increased, and the charging efficiency attenuation degree of the battery is represented by the charging internal resistance of the battery, so that the low-cost and high-efficiency battery charging efficiency attenuation degree measuring and calculating method is achieved. In addition, the average charging internal resistance is obtained by carrying out sectional test on the rated voltage of the battery to be tested, so that the accuracy of data is ensured, and the comprehensive result is more accurate.
Drawings
FIG. 1 is a schematic diagram of a configuration of a measuring and calculating device of a hardware running environment according to an embodiment of the present invention;
fig. 2 is a flow chart of measuring and calculating the internal resistance of the battery according to the measuring and calculating method of the attenuation degree of the charging power of the battery.
Fig. 3 is a flowchart of a method for measuring and calculating the attenuation degree of the battery charging power according to a first embodiment of the present invention.
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
As shown in fig. 1, fig. 1 is a schematic diagram of a terminal structure of a hardware running environment according to an embodiment of the present invention.
The measuring and calculating equipment of the embodiment of the invention can be a PC, and also can be mobile terminal equipment with a display function, such as a smart phone, a tablet personal computer, an electronic book reader, a portable computer and the like.
As shown in fig. 1, the measuring device may include: a processor 1001, such as a CPU, a network interface 1004, a user interface 1003, a memory 1005, a communication bus 1002. Wherein the communication bus 1002 is used to enable connected communication between these components. The user interface 1003 may include a Display, an input unit such as a Keyboard (Keyboard), and the optional user interface 1003 may further include a standard wired interface, a wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also optionally be a storage device separate from the processor 1001 described above.
Optionally, the measurement device may further include a camera, an RF (Radio Frequency) circuit, a sensor, an audio circuit, a WiFi module, and the like. Among other sensors, such as light sensors, motion sensors, and other sensors. In particular, the light sensor may include an ambient light sensor and a proximity sensor. As one of the motion sensors, the gravity acceleration sensor can detect the acceleration in all directions (generally three axes), and can detect the gravity and the direction when the motion sensor is stationary, and the motion sensor can be used for recognizing the gesture of mobile measuring and calculating equipment (such as horizontal and vertical screen switching, related games, magnetometer gesture calibration), vibration recognition related functions (such as pedometer and knocking), and the like; of course, the mobile measuring and calculating device may also be configured with other sensors such as a gyroscope, a barometer, a hygrometer, a thermometer, an infrared sensor, and the like, which are not described herein.
It will be appreciated by those skilled in the art that the configuration of the measuring device shown in FIG. 1 is not limiting of the measuring device and may include more or fewer components than shown, or may combine certain components, or a different arrangement of components.
As shown in fig. 1, an operating system, a network communication module, a user interface module, and a program for measuring the degree of battery charging power decay may be included in the memory 1005, which is a type of computer storage medium.
In the measuring and calculating device shown in fig. 1, the network interface 1004 is mainly used for connecting to a background server and performing data communication with the background server; the user interface 1003 is mainly used for connecting a client (user side) and performing data communication with the client; and the processor 1001 may be configured to invoke a measurement program of the battery charge power level of the battery stored in the memory 1005, and perform the following operations:
when a measurement request of the attenuation degree of the charging power is detected, determining a battery to be tested;
executing a multi-time charging internal resistance measuring and calculating process of two stages on the battery to be tested to obtain average charging internal resistances corresponding to the two stages of the battery to be tested;
obtaining the attenuation degree of the charging power of the battery to be tested according to the average charging internal resistance of the two stages;
the charging internal resistance measuring and calculating process comprises the following steps:
depleting the electric quantity of a battery to be tested, charging the battery to be tested with a constant preset excitation current, stopping charging when the open-circuit voltage of the battery to be tested reaches a preset target voltage, obtaining a stable open-circuit voltage which is kept unchanged after standing for a preset standing time and within a preset stable time, and comparing the absolute value of the difference value between the stable open-circuit voltage and the preset target voltage with a preset difference value;
if the voltage is smaller than the preset difference value, acquiring the stable open-circuit voltage as a first open-circuit voltage, charging the battery to be tested for a preset excitation time with a constant preset excitation current, and acquiring the charged excitation open-circuit voltage as a second open-circuit voltage;
and calculating to obtain the charging internal resistance according to the preset exciting current, the first open-circuit voltage and the second open-circuit voltage.
Further, the processor 1001 may call a measurement program of the battery charging power attenuation degree stored in the memory 1005, and further perform the following operations:
if the difference is larger than the preset difference, the stable open-circuit voltage of the battery to be tested is charged to the preset target voltage with constant preset supplementary current until the charging is stopped and the battery is kept still for the preset standing time, and the absolute value of the difference between the stable open-circuit voltage and the preset target voltage which are kept unchanged in the preset stable time is smaller than the preset difference.
Further, the processor 1001 may call a measurement program of the battery charging power attenuation degree stored in the memory 1005, and further perform the following operations:
if the preset excitation current, the first open circuit voltage and the second open circuit voltage are I, U and U2 respectively, the internal charging resistance r= (U2-U1)/I is set.
Further, the processor 1001 may call a measurement program of the battery charging power attenuation degree stored in the memory 1005, and further perform the following operations:
and if the average internal charging resistance of the first stage is Ravg1 and the average internal charging resistance of the second stage is Ravg2, the charging power attenuation degree phi=1- (Ravg 1/Ravg 2) of the battery to be tested.
Further, the processor 1001 may call a measurement program of the battery charging power attenuation degree stored in the memory 1005, and further perform the following operations:
the method comprises the steps of obtaining the number of strings of battery cells in a battery pack of a battery to be tested and the string open-circuit voltage of each string of battery cells, and obtaining a preset target voltage based on the number of strings of battery cells and the string open-circuit voltage of each string of battery cells.
Further, the processor 1001 may call a measurement program of the battery charging power attenuation degree stored in the memory 1005, and further perform the following operations:
obtaining the minimum value of the rated voltage interval of the battery to be tested based on the number of battery strings and the minimum string open-circuit voltage of each string of battery cells, obtaining the maximum value of the rated voltage interval of the battery to be tested based on the number of battery strings and the maximum string open-circuit voltage of each string of battery cells, and obtaining the preset target voltage based on the rated voltage interval.
Further, the processor 1001 may call a measurement program of the battery charging power attenuation degree stored in the memory 1005, and further perform the following operations:
after the rated voltage interval is obtained, equally dividing the rated voltage interval into voltage segments with preset segment numbers, and obtaining standby target voltages of all the voltage segments to serve as preset target voltages;
in each of the internal resistance measurement flows, before the step of charging the battery to be tested with a constant preset excitation current, the method further includes:
and selecting one of the standby target voltages of each voltage section as a preset target voltage used in the current internal resistance charging measurement process.
Further, the processor 1001 may call a measurement program of the battery charging power attenuation degree stored in the memory 1005, and further perform the following operations:
and measuring the charging internal resistance of each voltage segment based on the preset target voltage of each voltage segment, and obtaining the average charging internal resistance of the battery to be tested by combining the preset segment number.
Referring to fig. 2, the present invention provides a method for measuring and calculating the attenuation degree of battery charging power, in a process for measuring and calculating the internal resistance of charging according to the method for measuring and calculating the attenuation degree of battery charging power of the present invention, the process for measuring and calculating the internal resistance of charging includes:
when a measurement request of the attenuation degree of the charging power is detected, determining a battery to be tested;
executing a multi-time charging internal resistance measuring and calculating process of two stages on the battery to be tested to obtain average charging internal resistances corresponding to the two stages of the battery to be tested;
obtaining the attenuation degree of the charging power of the battery to be tested according to the average charging internal resistance of the two stages;
the charging internal resistance measuring and calculating process comprises the following steps:
and S10, exhausting the electric quantity of the battery to be tested, charging the battery to be tested with a constant preset excitation current, stopping charging when the open-circuit voltage of the battery to be tested reaches a preset target voltage, obtaining a stable open-circuit voltage which is kept standing for a preset standing time and is kept unchanged in a preset stable time, and comparing the absolute value of the difference value of the stable open-circuit voltage and the preset target voltage with a preset difference value.
The electric quantity consumption is carried out on the power battery of the electric automobile of a certain vehicle type, the power battery comprises a ternary lithium battery or a lithium iron phosphate battery, and the raw materials of the power battery are not limited in the embodiment of the invention. The electric vehicle can be discharged through running of the vehicle, power consumption of an on-board electric appliance or using any other equipment, such as a rotary drum, namely a chassis dynamometer, until the electric quantity of the ternary lithium battery of the electric vehicle is exhausted, namely, the power battery of the electric vehicle is discharged to the State of Charge (SOC) of 0, namely, the residual electric quantity is 0. The electric automobile is charged at room temperature by using a vehicle-mounted charging gun or a public charging pile, but is not charged by using a charging and discharging machine. During charging, the charging current is controlled to be stabilized at a constant value through an On-board charger (OBC), a Battery Management System (BMS) (Battery Management System) and a battery management system (VCU) (Vehicle control unit) of the electric vehicle, and is used as a preset exciting current, namely, the battery to be tested is charged with the constant preset exciting current, and is rapidly charged with the constant preset exciting current, so that the battery to be tested is charged to a preset target voltage in a short time as possible. When the open-circuit voltage of the power battery to be tested reaches a preset target voltage during charging, stopping charging and standing, wherein the standing time is longer than the preset standing time. Likewise, the rest time is set in advance by the OBC, BMS and VCU of the electric vehicle. And obtaining a stable open-circuit voltage which remains unchanged after stopping charging and standing for a preset standing time, calculating to obtain a difference value between the stable open-circuit voltage and a preset target voltage, and comparing an absolute value of the difference value with the preset difference value.
And step S20, if the voltage is smaller than the preset difference value, acquiring the stable open-circuit voltage as a first open-circuit voltage, charging the battery to be tested for a preset excitation time with a constant preset excitation current, and acquiring the charged excitation open-circuit voltage as a second open-circuit voltage.
And if the absolute value of the difference between the stable open-circuit voltage which is kept unchanged after stopping charging and standing for the preset standing time and the preset target voltage is smaller than the preset difference, taking the stable open-circuit voltage which is stable after standing as the first open-circuit voltage. And then charging the battery to be tested on the basis of the first open-circuit voltage by using the same constant preset excitation current controlled by the OBC, BMS and VCU of the electric automobile, wherein the charging time is the excitation time set in advance by the OBC, BMS and VCU of the electric automobile, and the open-circuit voltage of the battery to be tested after the charging of the preset excitation time is obtained as the second open-circuit voltage. And charging the battery to be tested for a preset excitation time with a constant preset excitation current on the basis of a stable open-circuit voltage, and obtaining the open-circuit voltage which is not subjected to standing at the moment after charging as a second open-circuit voltage.
Further, if the difference is larger than the preset difference, charging the stable open-circuit voltage of the battery to be tested to the preset target voltage with constant preset supplementary current until the absolute value of the difference between the stable open-circuit voltage and the preset target voltage which is kept unchanged in the preset stable time after stopping charging and standing for the preset standing time is smaller than the preset difference.
If the absolute value of the difference between the stable open-circuit voltage which is kept unchanged after stopping charging and standing for the preset standing time and the preset target voltage is larger than the preset difference, using constant preset supplementing current controlled by the OBC, BMS and VCU of the electric automobile, and supplementing the battery to be tested on the basis of the stable open-circuit voltage with the absolute value of the difference between the constant preset supplementing current and the preset target voltage being larger than the preset difference. And obtaining the open-circuit voltage of the charged battery to be tested, stopping charging and standing when the open-circuit voltage of the power battery to be tested reaches a preset target voltage, wherein the standing time is more than the preset standing time, until the absolute value of the difference value between the stable open-circuit voltage which is kept unchanged after the charging is stopped and the standing time is preset and the preset target voltage is smaller than the preset difference value, otherwise, circularly and repeatedly charging the battery to be tested with the preset complementary current.
Step S30, according to the preset excitation current, the first open-circuit voltage and the second open-circuit voltage, the charging internal resistance is calculated.
The method comprises the steps of obtaining a first open circuit voltage and a second open circuit voltage of a test after the battery to be tested is charged, calculating by utilizing ohm law in combination with a preset excitation current to obtain the charging internal resistance of the test, wherein the charging internal resistance is the charging internal resistance under the conditions of room temperature, preset target voltage, preset excitation time and preset excitation current, and the same conditions are kept before the final charging power attenuation degree of the battery to be tested is obtained, so that the accuracy of a result is ensured. And in order to accurately measure the attenuation degree of the charging power of the battery to be measured, repeating the test, and obtaining the attenuation degree of the charging power of the battery to be measured based on the average internal resistance of the battery to be measured.
In the embodiment, the charging process of the electric automobile is designed, parameters in the charging process are collected and analyzed, and the electric automobile is subjected to repeated charging test, so that the accurate charging power attenuation performance of the power battery of the electric automobile can be rapidly estimated. The method comprises the steps of circularly executing a plurality of charging internal resistance measuring and calculating processes of two stages of battery to be tested, exhausting the electric quantity of the battery to be tested to 0 after the measuring and calculating of the first stage is finished, and then carrying out measuring and calculating of the second stage, wherein the charging internal resistance measuring and calculating processes of the two stages are the same. However, in order to make the obtained measurement result, that is, the degree of attenuation of the charging power, sufficiently accurate, in the embodiment of the present invention, the number of measurements at each stage is not limited. For the charging internal resistance obtained through multiple measurement and calculation, the average value is taken to obtain the average charging internal resistance, and then the charging power attenuation degree is calculated, or the weighting of related parameters is set according to the specific measurement and calculation environment, and the charging power attenuation degree is calculated after weighting the average charging internal resistance.
Referring to fig. 3, the present invention provides a method for measuring and calculating a battery charging power attenuation degree, in a first embodiment of the method for measuring and calculating a battery charging power attenuation degree of the present invention, the step of determining a battery to be tested includes:
and step A, obtaining the serial number of the battery cells in the battery pack of the battery to be tested and the serial open-circuit voltage of each serial of the battery cells, and obtaining a preset target voltage based on the serial number of the battery cells and the serial open-circuit voltage of each serial of the battery cells.
Each string of battery cells has a minimum string open-circuit voltage and a maximum string open-circuit voltage, wherein the minimum string open-circuit voltage is the open-circuit voltage after the battery to be tested is depleted of the electric quantity, and the maximum string open-circuit voltage is the open-circuit voltage in the saturated state of the electric quantity of the battery to be tested.
The step of obtaining the preset target voltage based on the number of battery cells and the string open-circuit voltage of each string of battery cells comprises the following steps:
and B, obtaining the minimum value of the rated voltage interval of the battery to be tested based on the number of battery cells and the minimum string open-circuit voltage of each string of battery cells, obtaining the maximum value of the rated voltage interval of the battery to be tested based on the number of battery cells and the maximum string open-circuit voltage of each string of battery cells, and obtaining the preset target voltage based on the rated voltage interval.
Taking the product of the number of battery cells and the minimum string open-circuit voltage of each string of battery cells as the minimum value of the rated voltage interval of the battery to be tested, taking the product of the number of battery cells and the maximum string open-circuit voltage of each string of battery cells as the maximum value of the rated voltage interval of the battery to be tested, and setting the rated voltage interval by the minimum value and the maximum value of the rated voltage interval of the battery to be tested.
The step of obtaining the preset target voltage based on the rated voltage interval comprises the following steps:
step C, after the rated voltage interval is obtained, dividing the rated voltage interval into voltage segments with preset segment numbers, and obtaining standby target voltages of the voltage segments to serve as preset target voltages;
in each of the internal resistance measurement flows, before the step of charging the battery to be tested with a constant preset excitation current, the method further includes:
and selecting one of the standby target voltages of each voltage section as a preset target voltage used in the current internal resistance charging measurement process.
After the rated voltage interval of the battery to be tested is obtained, in the embodiment of the invention, the voltage interval of 30% -80% of the rated voltage interval is taken for equipartition so as to obtain the best test result, or the voltage interval of 30% -80% of the rated voltage interval is averted, and the voltage interval where the minimum and maximum preset target voltages are located is discarded for testing. In the embodiment of the invention, the selection of the optimal interval of the rated voltage is not limited. And then equally dividing the rated voltage optimal interval based on the preset number of segments, taking the maximum value of a certain voltage segment after equally dividing as the standby target voltage of the voltage segment, and then in a certain charging internal resistance measuring and calculating process, taking the standby target voltage of each voltage segment as the preset target voltage of the charging internal resistance measuring and calculating process, and testing the battery to be tested to obtain the average charging internal resistance. In the embodiment of the invention, the number of the equally divided segments of the voltage segment is not limited, and the selection rule of the standby target voltage of a certain voltage segment after the equally divided segments is also not limited.
The step of executing the multi-time charging internal resistance measuring and calculating process of the two stages of the battery to be tested to obtain the average charging internal resistance corresponding to the two stages of the battery to be tested comprises the following steps:
and D, measuring the charging internal resistance of each voltage segment based on the preset target voltage of each voltage segment, and obtaining the average charging internal resistance of the battery to be tested by combining the preset segment number.
After the preset target voltage of a certain voltage section is obtained, the battery to be tested is subjected to repeated testing for preset times to obtain the average charging internal resistance of the battery to be tested of the voltage section, or the repeated testing is not carried out, but only one time. In the embodiment of the invention, the test frequency of a certain section of voltage after the rated voltage interval is equally divided is not limited. However, it is necessary to perform an average division based on the number of preset segments, and test each voltage segment to obtain the internal charging resistances of the batteries to be tested corresponding to the number of preset segments, so as to calculate and obtain the average internal charging resistances of the batteries to be tested.
To assist in understanding the above-described steps of determining the battery to be tested, an explanation will now be made by way of one example.
Assuming that the rated voltage interval of the battery to be tested is 80-130V, taking a voltage interval of 30-80% of the rated voltage interval, namely 95-120V as the rated voltage optimal interval. Then equally dividing the three sections into a high section, a medium section and a low section: 95-103.333V, 103.333-111.666V and 111.666-120V, and the maximum value in three sections is taken: 103.333V, 111.666V and 120V are used as standby target voltages for three tests, when the battery to be tested is tested, the three standby target voltages are obtained as preset target voltages, the corresponding battery to be tested is tested to obtain the charging internal resistance, and then the average value is taken to calculate the attenuation degree of the charging efficiency of the battery to be tested.
In this embodiment, the adaptability test is performed according to the power battery specification of a specific electric vehicle, and the charging efficiency attenuation degree test is performed based on the number of strings of battery cells in the power battery pack and the string open-circuit voltage of each string of battery cells. Meanwhile, repeated tests between the segments are carried out on the rated voltage interval of the battery to be tested, so that the test efficiency is ensured, and meanwhile, the test accuracy is ensured.
Optionally, the step of obtaining the preset difference value includes:
after the preset target voltage of the battery to be tested is obtained, the value of the preset difference value is in the range of 0.1% -2% of the preset target voltage.
After the rated voltage optimal interval is equally divided based on the preset number of segments, taking the maximum value of a certain segment of voltage interval after the equal division as the preset target voltage of the segment of voltage interval, and taking the value of the voltage interval of each segment by using the same proportion, wherein the selection of the comparison example is not limited in the embodiment of the invention. For example, in the divided high voltage segments 111.666-120V, 120V is taken as the preset target voltage, and 1% of the preset target voltage of 120V, that is, 1.2V, may be taken as the preset difference value of the high voltage segments. Obtaining a stable open-circuit voltage which remains unchanged after stopping charging and standing for a preset standing time after charging a battery to be tested with a depleted electric quantity by a constant preset excitation current, and taking the stable open-circuit voltage as a first open-circuit voltage if the absolute value of the difference value between the stable open-circuit voltage and a 120V preset target voltage is within 1.2V; similarly, if the absolute value of the difference between the battery to be tested and the 120V preset target voltage is larger than 1.2V, on the basis that the absolute value of the difference between the battery to be tested and the 120V preset target voltage is larger than the stable open-circuit voltage of 1.2V, charging the open-circuit voltage of the battery to be tested to the 120V preset target voltage by using a constant preset complementary current until the absolute value of the difference between the stable open-circuit voltage which is kept unchanged after stopping charging and standing and the preset target voltage is within 1.2V, and taking the stable open-circuit voltage as the first open-circuit voltage.
Preferably, the present invention provides a method for measuring and calculating a battery charging power attenuation degree, and in a second embodiment of the method for measuring and calculating a battery charging power attenuation degree of the present invention, the method for measuring and calculating a battery charging power attenuation degree further includes:
when the battery to be tested is tested, the preset exciting current and the preset supplementing current are set through the BMS, the OBC and the VCU in advance, and the preset exciting time, the preset standing time and the preset stabilizing time are set.
Before the electric quantity of the battery to be tested is exhausted, the power battery to be tested is detected through BMS, OBC and VCU of each tested vehicle type, and exciting current and supplementing current of the battery to be tested are set in advance, and exciting time, standing time and stabilizing time are set.
To assist in understanding the execution of the above-described method of measuring and calculating the degree of attenuation of the charge power of the battery to be tested, explanation will now be made by way of the following example.
1. Taking an electric automobile of a certain vehicle type as an example, a chassis dynamometer is utilized to discharge a power battery of the electric automobile until the SOC is 0.
2. And charging the battery by using the onboard charging gun at room temperature, controlling the charging current to be constant and preset exciting current I1=16A (the value of the preset exciting current I1 is 0.05-0.3C), stopping charging and standing for more than preset standing time τ1=30min (the value of the preset standing time τ1 is 5-120 min) when the open-circuit voltage of the whole vehicle battery is charged to preset target voltage us=99.1V, and slowly reducing the open-circuit voltage of the battery to be stable open-circuit voltage 96.0V and keeping unchanged within preset stable time τ2=10min (the value of the preset stable time τ2 is 3-30 min).
3. The electric automobile is slowly charged in a supplementary mode by controlling the vehicle-mounted charger to be in constant preset supplementary current I2=1.6A until preset target voltage us=99.1V and kept still for more than preset standing time τ1=30min, and the open-circuit voltage of the battery falls back to the stable open-circuit voltage 97.2V and is kept unchanged within preset stable time τ2=10min.
4. Repeating the charging and standing steps of the preset complementary current I2=1.6A until the open-circuit voltage of the battery is stabilized at a preset target voltage us 99.1+/-0.5V after standing, and recording the open-circuit voltage Uc1 of the ternary lithium battery at the moment as 99.0V; then, the electric automobile is continuously charged by constant preset exciting current I1=16A, and the open-circuit voltage Uc2 of the ternary lithium battery after the preset exciting time tau=5s is recorded to be 112.2V (the value of the preset exciting time tau is between 0.1s and 30 s).
5. Then the three-element lithium battery of the pure electric vehicle has the charging internal resistance r under the conditions of room temperature, open circuit voltage of 99.1V, 5s and 16A c(99.1V、5S、16A) The method comprises the following steps:
r c(99.1V、5S、16A) ＝(112.2V-99.0V)/16A＝0.825Ω。
6. repeating the test on the pure electric automobile of a certain vehicle type according to the steps, wherein the test times of each automobile are not less than 3 times. The average internal resistance r of the vehicle under the conditions of room temperature, open circuit voltage of 99.1V, 5s and 16A is calculated c-avg(99.1V、5S、16A) 0.813 Ω.
7. Referring to the steps, the electric automobile of a certain vehicle type is subjected to internal resistance test under the conditions of room temperature, open-circuit voltage of 99.1V, open-circuit voltage within 5s and 16A, and the open-circuit voltage Uc '1 of the ternary lithium battery of the certain vehicle is 99.0V and Uc'2 of 115.3V.
8. The internal resistance of the power battery is calculated as follows:
r’ c(99.1V、5S、16A) ＝(115.3V-99.0V)/16A＝1.018Ω。
the average internal charging resistance r 'of the vehicle model is obtained by calculation through 3 times of measurement and average value calculation' c-avg(99.1V、5S、16A) 1.052Ω.
9. The charging power attenuation degree of the three-element lithium battery of the pure electric automobile in the room temperature and the open circuit voltage of 99.1V and 5s is calculated as follows:
Ф＝1-(r c-avg(99.1V、5S、16A) /r’ c(99.1V、5S、16A) )＝1-(0.813Ω/1.052Ω)＝22.7％
in addition, the embodiment of the invention also provides a device for measuring and calculating the attenuation degree of the battery charging power, which comprises: the method comprises the steps of a memory, a processor and a battery charging power attenuation degree measuring program which is stored in the memory and can run on the processor, wherein the battery charging power attenuation degree measuring program is executed by the processor to realize the battery charging power attenuation degree measuring method.
In addition, the embodiment of the invention further provides a computer readable storage medium, wherein the computer readable storage medium stores a program for measuring and calculating the attenuation degree of the battery charging power, and the program for measuring and calculating the attenuation degree of the battery charging power realizes the steps of the method for measuring and calculating the attenuation degree of the battery charging power when being executed by a processor.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
From the above description of the embodiments, it will be clear to those skilled in the art that the above-described embodiment method may be implemented by means of software plus a necessary general hardware platform, but of course may also be implemented by means of hardware, but in many cases the former is a preferred embodiment. Based on such understanding, the technical solution of the present invention may be embodied essentially or in a part contributing to the prior art in the form of a software product stored in a storage medium (e.g. ROM/RAM, magnetic disk, optical disk) as described above, comprising instructions for causing a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to perform the method according to the embodiments of the present invention.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (7)
1. The method for measuring and calculating the attenuation degree of the battery charging power is characterized by comprising the following steps of:
when a measurement request of the attenuation degree of the charging power is detected, determining a battery to be tested;
executing a multi-time charging internal resistance measuring and calculating process of two stages on the battery to be tested to obtain average charging internal resistances corresponding to the two stages of the battery to be tested;
obtaining the attenuation degree of the charging power of the battery to be tested according to the average charging internal resistance of the two stages;
the charging internal resistance measuring and calculating process comprises the following steps:
depleting the electric quantity of the battery to be tested, charging the battery to be tested with a constant preset excitation current, and stopping charging when the open-circuit voltage of the battery to be tested reaches a preset target voltage ， Acquisition ofAfter standing for a preset standing time, keeping a stable open circuit voltage unchanged within a preset stable time, and comparing the absolute value of the difference value between the stable open circuit voltage and a preset target voltage with a preset difference value;
if the voltage is smaller than the preset difference value, acquiring the stable open-circuit voltage as a first open-circuit voltage, charging the battery to be tested for a preset excitation time with a constant preset excitation current, and acquiring the charged excitation open-circuit voltage as a second open-circuit voltage;
according to a preset excitation current, a first open-circuit voltage and a second open-circuit voltage, calculating to obtain the internal resistance of charging, wherein the step of determining the battery to be tested comprises the following steps:
the method comprises the steps of obtaining the serial number of the battery cells in a battery pack of a battery to be tested and the serial open-circuit voltage of each serial of the battery cells, obtaining a preset target voltage based on the serial number of the battery cells and the serial open-circuit voltage of each serial of the battery cells, wherein each serial of the battery cells has a minimum serial open-circuit voltage and a maximum serial open-circuit voltage, and obtaining the preset target voltage based on the serial number of the battery cells and the serial open-circuit voltage of each serial of the battery cells comprises the following steps:
obtaining a minimum value of a rated voltage interval of the battery to be tested based on the number of battery strings and the minimum string open-circuit voltage of each string of battery cells, obtaining a maximum value of the rated voltage interval of the battery to be tested based on the number of battery strings and the maximum string open-circuit voltage of each string of battery cells, and obtaining a preset target voltage based on the rated voltage interval, wherein the step of obtaining the preset target voltage based on the rated voltage interval comprises the following steps:
after the rated voltage interval is obtained, equally dividing the rated voltage interval into voltage segments with preset segment numbers, and obtaining standby target voltages of all the voltage segments to serve as preset target voltages;
in each of the internal resistance measurement flows, before the step of charging the battery to be tested with a constant preset excitation current, the method further includes:
and selecting one of the standby target voltages of each voltage section as a preset target voltage used in the current internal resistance charging measurement process.
2. The method for measuring and calculating the attenuation degree of the battery charging power according to claim 1, further comprising, after said step of comparing the absolute value of the difference between said stable open-circuit voltage and a preset target voltage with a preset difference:
if the difference is larger than the preset difference, the stable open-circuit voltage of the battery to be tested is charged to the preset target voltage with constant preset supplementary current until the charging is stopped and the battery is kept still for the preset standing time, and the absolute value of the difference between the stable open-circuit voltage and the preset target voltage which are kept unchanged in the preset stable time is smaller than the preset difference.
3. The method for measuring and calculating the attenuation degree of the charging power of the battery according to claim 1, wherein the step of calculating the internal resistance of the charge according to the preset excitation current, the first open-circuit voltage and the second open-circuit voltage comprises:
if the preset excitation current, the first open circuit voltage and the second open circuit voltage are I, U and U2 respectively, the internal charging resistance r= (U2-U1)/I is set.
4. The method for measuring and calculating the attenuation degree of the charging power of the battery according to claim 1, wherein the step of obtaining the attenuation degree of the charging power of the battery to be tested according to the average internal resistance of charging in the two stages comprises:
and if the average internal charging resistance of the first stage is Ravg1 and the average internal charging resistance of the second stage is Ravg2, the charging power attenuation degree phi=1- (Ravg 1/Ravg 2) of the battery to be tested.
5. The method for measuring and calculating the attenuation degree of the charging power of the battery according to claim 1, wherein the step of performing a two-stage multi-charge internal resistance measuring and calculating process on the battery to be tested to obtain the average charge internal resistance corresponding to the two stages of the battery to be tested comprises:
and measuring the charging internal resistance of each voltage segment based on the preset target voltage of each voltage segment, and obtaining the average charging internal resistance of the battery to be tested by combining the preset segment number.
6. A battery charge power level decay measuring apparatus, the battery charge power level decay measuring apparatus comprising: a memory, a processor and a program stored on the memory and operable on the processor to calculate the battery charge power level of the battery, the program when executed by the processor implementing the steps of the method of calculating the battery charge power level of any one of claims 1 to 5.
7. A computer-readable storage medium, wherein a program for measuring the degree of attenuation of battery charging power is stored on the computer-readable storage medium, and the program for measuring the degree of attenuation of battery charging power, when executed by a processor, implements the steps of the method for measuring the degree of attenuation of battery charging power according to any one of claims 1 to 5.
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