CN117783908A - Battery electric quantity testing method, device and testing system - Google Patents
Battery electric quantity testing method, device and testing system Download PDFInfo
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Abstract
The application relates to a battery electric quantity testing method, a device and a testing system, wherein the method comprises the steps of obtaining a first discharge capacity and a second discharge capacity of a battery to be tested; the first discharge capacity is obtained by performing capacity test on the battery to be tested based on the first temperature; the second discharge capacity is obtained by performing capacity test on the battery to be tested based on the second temperature; obtaining zero capacity according to the first discharge capacity and the second discharge capacity; acquiring the current charge capacity of a battery to be tested; when the current charge capacity is smaller than a first charge threshold value, processing the current charge capacity based on a first preset charge-discharge capacity model to obtain a current discharge capacity; the first charging threshold value is smaller than zero capacity, the electricity quantity which can be discharged by the battery to be tested in the current state is accurately determined, the electricity quantity which can be discharged by the battery in a small quantity of electricity states can be determined, the discharge capacity test error is reduced, and the test accuracy of the discharge capacity is improved.
Description
Technical Field
The present disclosure relates to the field of battery technologies, and in particular, to a method, an apparatus, and a system for testing battery power.
Background
Battery testing is advantageous to ensure the performance of the application product, which can only be optimized when the battery is healthy. If the battery deviates from its specific parameters, it will lead to reduced performance of the device and even to paralysis or damage of the application product. The capacity of a battery is one of its important performance indicators and is also an important consideration for users to choose a battery. The actual capacity of the battery is tested to help a user to accurately determine the actual dischargeable electric quantity of the battery.
In the existing battery electric quantity test, the dischargeable electric quantity test is usually only performed on the battery in the full-charge state, if a battery discharge electric quantity test mode in the full-charge state is adopted to test the dischargeable electric quantity of the battery in a small quantity of electricity (such as 20% of electric quantity) state, the discharge capacity test error is large, and the electric quantity that the battery can still discharge in the small quantity of electricity state cannot be accurately judged.
Disclosure of Invention
Accordingly, it is necessary to provide a battery power testing method, device and system capable of accurately determining the power that can be discharged by a battery in a small amount of power state and having small discharge capacity testing error, aiming at the technical problems existing in the conventional battery power testing.
In a first aspect, the present application provides a method for testing battery power, including the steps of:
Acquiring a first discharge capacity and a second discharge capacity of a battery to be tested; the first discharge capacity is obtained by performing capacity test on the battery to be tested based on the first temperature; the second discharge capacity is obtained by performing capacity test on the battery to be tested based on the second temperature;
obtaining zero capacity according to the first discharge capacity and the second discharge capacity;
acquiring the current charge capacity of a battery to be tested;
when the current charge capacity is smaller than a first charge threshold value, processing the current charge capacity based on a first preset charge-discharge capacity model to obtain a current discharge capacity; the first charge threshold is less than the zero capacity.
In one embodiment, the step of obtaining the current charge capacity of the battery to be measured includes:
when the current charge capacity is larger than a second charge threshold, processing the current charge capacity based on a second preset charge-discharge capacity model to obtain a current discharge capacity; the second charge threshold is greater than the zero capacity.
In one embodiment, the obtaining of the first preset charge-discharge capacity model includes:
based on the first multiplying power, the first temperature and the first charging threshold, performing a charging test on the battery to be tested to obtain a plurality of first test charging capacities;
Performing discharge test on the battery to be tested based on the first multiplying power, the second temperature and the first cut-off voltage to obtain a plurality of first test discharge capacities corresponding to the first test charge capacities; the first temperature is greater than the second temperature;
and establishing a first preset charge-discharge capacity model corresponding to the battery to be tested according to each first test charge capacity and each first test discharge capacity.
In one embodiment, based on the first multiplying power, the first temperature and the first charging threshold, the step of performing a charging test on the battery to be tested to obtain a plurality of first test charging capacities includes:
and discharging the battery to be tested based on the first temperature and the first multiplying power until the voltage of the battery to be tested is the first cut-off voltage.
In one embodiment, the obtaining of the second preset charge-discharge capacity model includes:
based on the first multiplying power, the first temperature and the second charging threshold, performing a charging test on the battery to be tested to obtain a plurality of second test charging capacities;
performing discharge test on the battery to be tested based on the first multiplying power, the second temperature and the first cut-off voltage to obtain a plurality of second test discharge capacities corresponding to the second test charge capacities;
And establishing a second preset charge-discharge capacity model corresponding to the battery to be tested according to each second test charge capacity and each second test discharge capacity.
In one embodiment, based on the first multiplying power, the first temperature and the second charging threshold, the step of performing a charging test on the battery to be tested to obtain a plurality of second test charging capacities includes:
and discharging the battery to be tested based on the first temperature and the first multiplying power until the voltage of the battery to be tested is the first cut-off voltage.
In one embodiment, the step of obtaining the first discharge capacity includes:
based on the first multiplying power, the first temperature and the second cut-off voltage, performing a charging test on the battery to be tested until the voltage of the battery to be tested is the second cut-off voltage;
performing discharge test on the battery to be tested charged to the second cut-off voltage based on the first multiplying power and the first temperature until the voltage of the battery to be tested is the first cut-off voltage, so as to obtain a plurality of first single discharge capacities;
and carrying out average value processing on each first single discharge capacity to obtain first discharge capacity.
In one embodiment, the step of obtaining the second discharge capacity includes:
based on the first multiplying power, the third temperature and the second cut-off voltage, performing a charging test on the battery to be tested until the voltage of the battery to be tested is the second cut-off voltage;
Performing discharge test on the battery to be tested charged to the second cut-off voltage based on the first multiplying power and the second temperature until the voltage of the battery to be tested is the first cut-off voltage, so as to obtain a plurality of second single discharge capacities; the second temperature is less than the third temperature, which is less than the first temperature;
and carrying out average value treatment on each second single discharge capacity to obtain second discharge capacity.
In a second aspect, the present application provides a battery power testing device, comprising:
the discharge capacity acquisition module is used for acquiring a first discharge capacity and a second discharge capacity of the battery to be tested; the first discharge capacity is obtained by performing capacity test on the battery to be tested based on the first temperature; the second discharge capacity is obtained by performing capacity test on the battery to be tested based on the second temperature;
the zero capacity processing module is used for obtaining zero capacity according to the first discharge capacity and the second discharge capacity;
the charging capacity acquisition module is used for acquiring the current charging capacity of the battery to be tested;
the electric quantity calculation module is used for processing the current charging capacity based on a first preset charging and discharging capacity model to obtain the current discharging capacity when the current charging capacity is smaller than a first charging threshold value; the first charge threshold is less than the zero capacity.
In a third aspect, the present application provides a battery testing system, including a processing device and a charging and discharging apparatus for charging and discharging a battery to be tested; the processing equipment is connected with the charging and discharging device;
the processing device is configured to perform the steps of the battery level testing method as described above.
One of the above technical solutions has the following advantages and beneficial effects:
in the battery electric quantity testing method, the first discharge capacity and the second discharge capacity of the battery to be tested are obtained; the first discharge capacity is obtained by performing capacity test on the battery to be tested based on the first temperature; the second discharge capacity is obtained by performing capacity test on the battery to be tested based on the second temperature; obtaining zero capacity according to the first discharge capacity and the second discharge capacity; acquiring the current charge capacity of a battery to be tested; when the current charge capacity is smaller than a first charge threshold value, processing the current charge capacity based on a first preset charge-discharge capacity model to obtain a current discharge capacity; the first charging threshold value is smaller than the zero capacity, so that accurate judgment of the current dischargeable capacity of the battery to be tested is realized. According to the method, capacity test is conducted on the battery to be tested at different temperatures, and the first discharge capacity and the second discharge capacity are obtained through the test; the zero capacity is obtained by processing the first discharge capacity and the second discharge capacity; through pre-establishing a first preset charge-discharge capacity model, when the current electric quantity of the battery to be measured still can be determined, the current charge capacity can be compared with a first charge threshold value, if the current charge capacity is smaller than the first charge threshold value, the current charge capacity is input into the first preset charge-discharge capacity model for processing, the current discharge capacity corresponding to the battery to be measured is obtained, the accurate determination of the electric quantity of the battery to be measured still can be determined in the current state is realized, the electric quantity of the battery can be determined in a small quantity of electric states, the discharge capacity test error is reduced, and the test accuracy of the discharge capacity is improved.
Drawings
Fig. 1 is a schematic diagram of an application scenario of a battery power testing method in an embodiment of the present application;
FIG. 2 is a schematic diagram of a first flow chart of a battery power testing method according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram illustrating a second flow chart of a battery power testing method according to an embodiment of the present disclosure;
FIG. 4 is a flowchart illustrating a first step of obtaining a preset charge-discharge capacity model according to an embodiment of the present application;
FIG. 5 is a flowchart illustrating a second step of acquiring a second preset charge-discharge capacity model according to an embodiment of the present application;
FIG. 6 is a flowchart illustrating a first discharge capacity obtaining step in the embodiment of the present application;
FIG. 7 is a flowchart showing a second discharge capacity obtaining step in the embodiment of the present application;
FIG. 8 is a block diagram of a battery power testing device according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of a battery test system according to an embodiment of the present application.
Detailed Description
In order to make the present application solution better understood by those skilled in the art, the following description will be made in detail and with reference to the accompanying drawings in the embodiments of the present application, it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments herein without making any inventive effort, shall fall within the scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate in order to describe the embodiments of the present application described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The battery electric quantity testing method provided by the application can be applied to an application environment shown in fig. 1. The processing device may include a processor 102 and a memory 104, where the memory 104 may be configured to store data such as a first discharge capacity, a second discharge capacity, a zero point capacity, a current charge capacity, and a current discharge capacity. The processor 102 may be configured to obtain a first discharge capacity and a second discharge capacity of the battery to be tested; the first discharge capacity is obtained by performing capacity test on the battery to be tested based on the first temperature; the second discharge capacity is obtained by performing capacity test on the battery to be tested based on the second temperature; obtaining zero capacity according to the first discharge capacity and the second discharge capacity; acquiring the current charge capacity of a battery to be tested; when the current charge capacity is smaller than a first charge threshold value, processing the current charge capacity based on a first preset charge-discharge capacity model to obtain a current discharge capacity; the first charge threshold is less than the zero capacity. The processing device may further include a display 106, and the display 106 may display data of the first discharge capacity, the second discharge capacity, the zero point capacity, the current charge capacity, the current discharge capacity, and the like through a graphical interface.
For example, the battery power testing method can be applied to a battery testing system, the battery testing system can comprise a charging and discharging device, the processing equipment is connected with the charging and discharging device, and the charging and discharging device is used for charging and discharging a battery to be tested. The charging and discharging device comprises a charging and discharging cabinet, the battery to be tested is electrically connected with the charging and discharging cabinet, and the processing equipment is in communication connection with the charging and discharging cabinet so as to realize charging and discharging test control of the charging and discharging cabinet and test data acquisition of the battery to be tested.
In one embodiment, as shown in fig. 2, a method for testing battery power is provided, and the method is applied to the processor 102 in fig. 1 for illustration, and includes the following steps:
step S210, obtaining a first discharge capacity and a second discharge capacity of a battery to be tested; the first discharge capacity is obtained by performing capacity test on the battery to be tested based on the first temperature; the second discharge capacity is obtained by performing capacity test on the battery to be tested based on the second temperature.
The battery to be tested can be, but not limited to, a lithium ion battery. The battery to be tested may be a single cell, for example. In addition, the battery to be tested can also be a battery module consisting of a plurality of battery cells. The first temperature may be a normal temperature, for example, the first temperature may be set to 25 ℃, and in order to improve the test efficiency, an allowable error may be set to the temperature, for example, the first temperature may also be any value between 23 ℃ and 27 ℃. The second temperature may be a low temperature, for example, the second temperature may be set to 2 ℃, and in order to improve the test efficiency, an allowable error may be set to the temperature, for example, the second temperature may also be any value between-2 ℃ and 2 ℃.
The method comprises the steps of standing a battery to be measured at a first temperature, performing discharge test on the battery to be measured, and measuring the discharge capacity of the battery to be measured in the discharge process, so as to obtain a first discharge capacity, namely the first discharge capacity is obtained through normal-temperature discharge capacity calibration. And standing the battery to be tested at a second temperature, then performing discharge test on the battery to be tested, and measuring the discharge capacity of the battery to be tested in the discharge process, thereby obtaining a second discharge capacity, namely the second discharge capacity is obtained through low-temperature discharge capacity calibration. In another example, the first discharge capacity and the second discharge capacity of the battery to be measured may be stored in the memory in advance, and when the discharge capacity test is required to be performed on the battery to be measured, the memory may be read through the identification code of the battery to be measured, so as to obtain the first discharge capacity and the second discharge capacity of the corresponding battery to be measured.
Step S220, obtaining the zero point capacity according to the first discharge capacity and the second discharge capacity.
The zero capacity refers to the discharge difference value of the battery to be tested at different temperatures. The battery to be measured is charged at normal temperature, discharged at low temperature, and a part of the discharged capacity is called zero capacity, and for example, the difference between the discharge capacity detected at normal temperature (e.g., 25 ℃) and the discharge capacity detected at low temperature (2 ℃) is determined as zero capacity.
The processor may perform a difference process on the first discharge capacity and the second discharge capacity (i.e., subtracting the second discharge capacity from the first discharge capacity) according to the obtained first discharge capacity and second discharge capacity, so as to obtain a zero point capacity.
Step S230, obtaining the current charge capacity of the battery to be tested.
The current charging capacity refers to the current charging capacity of the battery to be tested. For example, the charging capacity of the battery to be measured at the current time is obtained, and then the current charging capacity is obtained.
Step S240, when the current charge capacity is smaller than a first charge threshold, processing the current charge capacity based on a first preset charge-discharge capacity model to obtain a current discharge capacity; the first charge threshold is less than the zero capacity.
The first preset charge-discharge capacity model can be established in advance according to historical test data. For example, a sufficient electric test can be performed by selecting a test battery with the same model as the battery to be tested to obtain a large amount of historical charge capacity and corresponding historical discharge capacity, and then a first preset charge-discharge capacity model is established and obtained according to the large amount of historical charge capacity and corresponding historical discharge capacity.
The processor may call a corresponding first preset charge-discharge capacity model according to the identification code of the battery to be tested, and further input the current charge capacity into the first preset charge-discharge capacity model for processing when the current charge capacity is smaller than the first charge threshold value, so as to obtain the current discharge capacity of the battery to be tested, and accurately determine the amount of electricity that the battery to be tested can discharge. It should be noted that the identification code of the battery to be tested may be, but is not limited to, the model number of the battery to be tested.
The first charge threshold is set to be smaller than the zero point capacity, for example, the first charge threshold may be set to be half of the zero point capacity, the first discharge capacity is set to be Q1, the second discharge capacity is set to be Q2, the zero point capacity is set to be Q1-Q2, and the first charge threshold is set to be (Q1-Q2)/2. The processor can compare the obtained current charge capacity with a first charge threshold value, and if the current charge capacity is smaller than the first charge threshold value, the current charge capacity is input into a first preset charge-discharge capacity model for processing, so that the current discharge capacity of the battery to be tested is obtained.
In the above embodiment, the first discharge capacity and the second discharge capacity of the battery to be measured are obtained; the first discharge capacity is obtained by performing capacity test on the battery to be tested based on the first temperature; the second discharge capacity is obtained by performing capacity test on the battery to be tested based on the second temperature; obtaining zero capacity according to the first discharge capacity and the second discharge capacity; acquiring the current charge capacity of a battery to be tested; when the current charge capacity is smaller than a first charge threshold value, processing the current charge capacity based on a first preset charge-discharge capacity model to obtain a current discharge capacity; the first charging threshold value is smaller than the zero capacity, so that accurate judgment of the current dischargeable capacity of the battery to be tested is realized. According to the method, capacity test is conducted on the battery to be tested at different temperatures, and the first discharge capacity and the second discharge capacity are obtained through the test; the zero capacity is obtained by processing the first discharge capacity and the second discharge capacity; through pre-establishing a first preset charge-discharge capacity model, when the current electric quantity of the battery to be measured still can be determined, the current charge capacity can be compared with a first charge threshold value, if the current charge capacity is smaller than the first charge threshold value, the current charge capacity is input into the first preset charge-discharge capacity model for processing, the current discharge capacity corresponding to the battery to be measured is obtained, the accurate determination of the electric quantity of the battery to be measured still can be determined in the current state is realized, the electric quantity of the battery can be determined in a small quantity of electric states, the discharge capacity test error is reduced, and the test accuracy of the discharge capacity is improved.
In one embodiment, as shown in fig. 3, a method for testing battery power is provided, and the method is applied to the processor 102 in fig. 1 for illustration, and includes the following steps:
step S310, obtaining a first discharge capacity and a second discharge capacity of a battery to be tested; the first discharge capacity is obtained by performing capacity test on the battery to be tested based on the first temperature; the second discharge capacity is obtained by performing capacity test on the battery to be tested based on the second temperature.
The specific description of step S310 is referred to the description of the above embodiments, and is not repeated here.
Step S320, obtaining the zero point capacity according to the first discharge capacity and the second discharge capacity.
The specific description of step S320 is referred to the description of the above embodiments, and is not repeated here.
Step S330, the current charge capacity of the battery to be tested is obtained.
The specific description of step S330 is referred to the description of the above embodiments, and is not repeated here.
Step S340, when the current charge capacity is smaller than the first charge threshold, processing the current charge capacity based on a first preset charge-discharge capacity model to obtain the current discharge capacity; the first charge threshold is less than the zero capacity.
The specific description of step S340 is referred to the description of the above embodiments, and is not repeated here.
Step S350, when the current charge capacity is larger than a second charge threshold, processing the current charge capacity based on a second preset charge-discharge capacity model to obtain the current discharge capacity; the second charge threshold is greater than the zero capacity.
The second preset charge-discharge capacity model can be established in advance according to historical test data. For example, a full electric test can be performed by selecting a test battery with the same model as the battery to be tested to obtain a large amount of historical charge capacity and corresponding historical discharge capacity, and then a second preset charge-discharge capacity model is established and obtained according to the large amount of historical charge capacity and corresponding historical discharge capacity.
The second charge threshold is set to be greater than the zero point capacity, for example, the second charge threshold may be set to be twice the zero point capacity, the first discharge capacity is set to be Q1, the second discharge capacity is set to be Q2, the zero point capacity is set to be Q1-Q2, and the second charge threshold is set to be (Q1-Q2) ×2.
The processor can compare the obtained current charge capacity with a second charge threshold, and if the current charge capacity is larger than the second charge threshold, the current charge capacity is input into a second preset charge-discharge capacity model for processing, so that the current discharge capacity of the battery to be tested is obtained.
In the above embodiment, the first discharge capacity and the second discharge capacity are obtained by performing the capacity test on the battery to be tested at different temperatures; the zero capacity is obtained by processing the first discharge capacity and the second discharge capacity; through pre-establishing a first preset charge-discharge capacity model and a second preset charge-discharge capacity model, when the current dischargeable electric quantity of the battery to be tested is required to be determined, the current charge capacity, a first charge threshold and a second charge threshold can be compared, and corresponding preset charge-discharge capacity models (the first preset charge-discharge capacity model and the second preset charge-discharge capacity model) are selected to be processed according to the comparison result, so that the current discharge capacity of the corresponding battery to be tested is obtained, the electric quantity which can be further dischargeable under the current state of the battery to be tested is accurately determined, the dischargeable electric quantity of the battery under the state of a small quantity of electricity (such as the total electric quantity is lower than 20%) can be determined, the discharge capacity test error is reduced, and the test accuracy of the discharge capacity is improved.
In one embodiment, as shown in fig. 4, the step of obtaining the first preset charge-discharge capacity model includes:
step S420, based on the first multiplying power, the first temperature and the first charging threshold, the battery to be tested is subjected to charging test, and a plurality of first test charging capacities are obtained.
The first multiplying power may be 0.1C multiplying power, the first temperature may be a normal temperature (e.g. any value of 25±2 ℃), and the first charging threshold may be half of the zero capacity.
For example, when the current temperature of the battery to be measured reaches the first temperature, constant-current charging is performed on the battery to be measured based on the first multiplying power until the charging capacity of the battery to be measured reaches a first charging threshold, and then a first test charging capacity is obtained. And (3) based on the uploading step, repeating constant-current charging test on the battery to be tested for a plurality of times, and further obtaining each first test charging capacity.
Step S430, performing discharge test on the battery to be tested based on the first multiplying power, the second temperature and the first cut-off voltage to obtain a plurality of first test discharge capacities corresponding to the first test charge capacities; the first temperature is greater than the second temperature.
Wherein the second temperature may be a low temperature (e.g., any value between + -2deg.C). The first cut-off voltage refers to the lowest working voltage value of the battery which is not suitable for continuous discharge when the battery to be tested discharges. The first cut-off voltage can be preset according to a system. It should be noted that, different battery types and different discharge conditions, the corresponding first cut-off voltages are different.
For example, when the charging capacity of the battery to be measured reaches a first charging threshold, standing until the current temperature of the battery to be measured reaches a second temperature, and performing constant current discharge on the battery to be measured based on a first multiplying power until the battery to be measured is discharged to a first cut-off voltage, thereby obtaining a first test discharge capacity corresponding to the first test charging capacity. And (3) based on the uploading step, repeating constant-current discharge testing on the battery to be tested for a plurality of times, and further obtaining the first test discharge capacity of each corresponding first test charge capacity.
It should be noted that, after the constant current discharge test of the battery to be tested is completed at the present time based on step S430, the battery to be tested may be left for a preset time (for example, 120 seconds), and then the constant current discharge test of the battery to be tested is performed at the next time.
Step S440, according to each first test charge capacity and each first test discharge capacity, a first preset charge-discharge capacity model corresponding to the battery to be tested is established.
For example, the relationship mapping process is performed on each first test charge capacity and each first test discharge capacity, so as to obtain a first preset charge-discharge capacity model corresponding to the battery to be tested.
For example, if the first discharge capacity is set to Q1, the second discharge capacity is set to Q2, the current charge capacity is set to Q3, and the current discharge capacity is set to Q4, the first preset charge-discharge capacity model is: when 0 < Q3 < (Q1-Q2)/2, 61.75%. Times.Q 3 < Q4 < 92.5%. Times.Q 3. When the current charge capacity is larger than 0 and smaller than (Q1-Q2)/2, the current charge capacity is processed through a first preset charge-discharge capacity model, so that the current discharge capacity of the corresponding battery to be tested is obtained, the electric quantity of the battery which can be discharged in a small quantity of electricity (such as the total electric quantity is lower than 20%) can be determined, the discharge capacity test error is reduced, and the test accuracy of the discharge capacity is improved.
In one example, step S420 is preceded by:
step S410, discharging the battery to be tested based on the first temperature and the first multiplying power until the voltage of the battery to be tested is the first cut-off voltage.
For example, when the current temperature of the battery to be measured reaches the first temperature, constant-current discharge is performed on the battery to be measured based on the first multiplying power until the battery to be measured is discharged to the first cut-off voltage, so as to realize the discharging operation before the battery to be measured is charged and tested, thereby improving the accuracy of obtaining the first test charging capacity in step S420.
In one embodiment, as shown in fig. 5, the step of obtaining the second preset charge-discharge capacity model includes:
and step S520, performing a charging test on the battery to be tested based on the first multiplying power, the first temperature and the second charging threshold value to obtain a plurality of second test charging capacities.
The first multiplying power may be 0.1C multiplying power, the first temperature may be normal temperature (e.g. any value of 25±2 ℃), and the second charging threshold may be twice the zero-point capacity.
For example, when the current temperature of the battery to be measured reaches the first temperature, constant-current charging is performed on the battery to be measured based on the first multiplying power until the charging capacity of the battery to be measured reaches the second charging threshold, and then the second test charging capacity is obtained. And (3) based on the uploading step, repeating the constant current charging test on the battery to be tested for a plurality of times, and further obtaining each second test charging capacity.
And step S530, performing discharge test on the battery to be tested based on the first multiplying power, the second temperature and the first cut-off voltage to obtain a plurality of second test discharge capacities corresponding to the second test charge capacities.
Wherein the second temperature may be a low temperature (e.g., any value between + -2deg.C).
For example, when the charging capacity of the battery to be measured reaches a second charging threshold, standing until the current temperature of the battery to be measured reaches a second temperature, and performing constant current discharge on the battery to be measured based on the first multiplying power until the battery to be measured is discharged to a first cut-off voltage, thereby obtaining a second test discharge capacity corresponding to the second test charging capacity. And (3) based on the uploading step, repeating the constant-current discharge test on the battery to be tested for a plurality of times, and further obtaining the second test discharge capacity corresponding to the second test charge capacity.
It should be noted that, after the current constant current discharge test of the battery to be tested is completed based on step S530, the battery to be tested may be left for a preset time (e.g. 120 seconds), and then the next constant current discharge test of the battery to be tested is performed.
Step S540, a second preset charge-discharge capacity model corresponding to the battery to be tested is established according to the second test charge capacities and the second test discharge capacities.
For example, the relationship mapping process is performed on each second test charge capacity and each second test discharge capacity, so as to obtain a second preset charge-discharge capacity model corresponding to the battery to be tested.
For example, if the first discharge capacity is set to Q1, the second discharge capacity is set to Q2, the current charge capacity is set to Q3, and the current discharge capacity is set to Q4, the second preset charge-discharge capacity model is: when (Q1-Q2) 2 < Q3 < Q1, 0 < Q4 < 60.72%. Times.Q 3.
In one example, step S520 is preceded by:
and step S510, discharging the battery to be tested based on the first temperature and the first multiplying power until the voltage of the battery to be tested is the first cut-off voltage.
For example, when the current temperature of the battery to be measured reaches the first temperature, constant-current discharge is performed on the battery to be measured based on the first multiplying power until the battery to be measured is discharged to the first cut-off voltage, so as to realize the discharging operation before the battery to be measured is charged and tested, thereby improving the accuracy of obtaining the second test charging capacity in step S520.
In one embodiment, as shown in fig. 6, the obtaining step of the first discharge capacity includes:
step S610, based on the first multiplying power, the first temperature and the second cut-off voltage, the battery to be tested is charged and tested until the voltage of the battery to be tested is the second cut-off voltage.
The second cut-off voltage is a voltage when the battery reaches a full charge state during a predetermined constant current charging period. The second cut-off voltage can be obtained according to the system preset. It should be noted that, the respective second cut-off voltages are different for different battery types.
And when the current temperature of the battery to be tested reaches the first temperature, carrying out standard charging on the battery to be tested based on the first multiplying power until the battery to be tested is charged to the second cut-off voltage, so as to realize the charging test operation of the battery to be tested based on the first temperature.
And step S620, performing discharge test on the battery to be tested charged to the second cut-off voltage based on the first multiplying power and the first temperature until the voltage of the battery to be tested is the first cut-off voltage, so as to obtain a plurality of first single discharge capacities.
And when the current temperature of the battery to be tested, which is charged to the second cut-off voltage, reaches the first temperature, constant-current discharge is carried out on the battery to be tested based on the first multiplying power until the battery to be tested is discharged to the first cut-off voltage, so that the first single discharge capacity is obtained. And (3) based on the uploading step, repeating the constant current charging test on the battery to be tested for a plurality of times, and further obtaining each first single discharge capacity.
Step S630, performing an average value processing on each first single discharge capacity to obtain a first discharge capacity.
And carrying out average value processing on each first single discharge capacity obtained through testing, and further obtaining the first discharge capacity. The maximum value and the minimum value in each first single discharge capacity can be eliminated, and then the average value processing is carried out on the remaining first single discharge capacities, so that the optimized first discharge capacity is obtained, and the accuracy of obtaining the first discharge capacity is improved.
Illustratively, the first temperature is a normal temperature (e.g., any one of 25 ℃ + -2 ℃), and the temperature of the battery to be measured is left to stand to 25 ℃ + -2 ℃; charging the battery to be tested based on a standard charging mode until the voltage of the battery to be tested reaches a second cut-off voltage; then, standing the battery to be measured to 25+/-2 ℃; and performing constant-current discharge test on the battery to be tested based on the first multiplying power until the voltage of the battery to be tested is reduced to a first cut-off voltage, and further testing to obtain a first single discharge capacity, so that capacity calibration of the battery to be tested at normal temperature is realized. The standard charging mode is as follows: and carrying out constant-current charging on the battery to be tested at the rate of 0.1C until the voltage of the battery to be tested reaches the second cut-off voltage. In one example, after the current constant current discharge test of the battery to be tested is completed based on step S620, the battery to be tested may be left for a preset time (e.g., 120 seconds), and then the next constant current discharge test of the battery to be tested is performed.
It should be noted that, in the process of discharging the battery to be tested, the discharging current and the discharging duration of the battery to be tested can be collected in real time, and then the first single discharging capacity can be obtained according to the discharging current and the discharging duration.
In one embodiment, as shown in fig. 7, the obtaining step of the second discharge capacity includes:
step S710, based on the first multiplying power, the third temperature and the second cut-off voltage, performing a charging test on the battery to be tested until the voltage of the battery to be tested is the second cut-off voltage.
Wherein the third temperature may be set to any value of 10 ℃ + -2 ℃.
And when the current temperature of the battery to be tested reaches the third temperature, carrying out standard charging on the battery to be tested based on the first multiplying power until the battery to be tested is charged to the second cut-off voltage, so as to realize the charging test operation of the battery to be tested based on the first temperature.
Step S720, based on the first multiplying power and the second temperature, performing discharge test on the battery to be tested charged to the second cutoff voltage until the voltage of the battery to be tested is the first cutoff voltage, so as to obtain a plurality of second single discharge capacities; the second temperature is less than the third temperature, which is less than the first temperature.
And when the current temperature of the battery to be tested, which is charged to the second cut-off voltage, reaches the second temperature, constant-current discharge is carried out on the battery to be tested based on the first multiplying power until the battery to be tested is discharged to the first cut-off voltage, so that the second single discharge capacity is obtained. And (3) based on the uploading step, repeating the constant current charging test on the battery to be tested for a plurality of times, and further obtaining each second single discharge capacity.
Step S730, performing an average value processing on each second single discharge capacity to obtain a second discharge capacity.
And carrying out average value processing on each second single discharge capacity obtained through testing, and further obtaining the second discharge capacity. The maximum value and the minimum value of each second single discharge capacity can be eliminated, and then the average value of the remaining second single discharge capacities is processed, so that the optimized second discharge capacity is obtained, and the accuracy of obtaining the second discharge capacity is improved.
Illustratively, the second temperature is a low temperature (e.g., any one of.+ -. 2 ℃) and the third temperature is any one of 10.+ -. 2 ℃. Standing the battery to be measured to 10+/-2 ℃; charging the battery to be tested based on a standard charging mode until the voltage of the battery to be tested reaches a second cut-off voltage; then, standing the temperature of the battery to be measured to +/-2 ℃; and performing constant-current discharge test on the battery to be tested based on the first multiplying power until the voltage of the battery to be tested is reduced to a first cut-off voltage, and further testing to obtain a second single discharge capacity, thereby realizing capacity calibration of the battery to be tested at low temperature. The standard charging mode is as follows: and carrying out constant-current charging on the battery to be tested at the rate of 0.1C until the voltage of the battery to be tested reaches the second cut-off voltage. In one example, after the current constant current discharge test of the battery to be tested is completed based on step S720, the battery to be tested may be left for a preset time (e.g., 120 seconds), and then the next constant current discharge test of the battery to be tested is performed.
It should be noted that, during the discharging process of the battery to be tested, the discharging current and the discharging duration of the battery to be tested can be collected in real time, and then the second single discharging capacity can be obtained according to the discharging current and the discharging duration.
It should be understood that, although the steps in the flowcharts of fig. 2 to 7 are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps of fig. 2-7 may include multiple sub-steps or stages that are not necessarily performed at the same time, but may be performed at different times, nor does the order in which the sub-steps or stages are performed necessarily occur in sequence, but may be performed alternately or alternately with at least a portion of other steps or sub-steps or stages of other steps.
In one embodiment, as shown in fig. 8, the present application provides a battery power testing device, including:
the discharge capacity obtaining module 810 is configured to obtain a first discharge capacity and a second discharge capacity of the battery to be tested; the first discharge capacity is obtained by performing capacity test on the battery to be tested based on the first temperature; the second discharge capacity is obtained by performing capacity test on the battery to be tested based on the second temperature.
The zero-point capacity processing module 820 is configured to obtain a zero-point capacity according to the first discharge capacity and the second discharge capacity.
The charging capacity obtaining module 830 is configured to obtain a current charging capacity of the battery to be tested.
The electric quantity calculation module 840 is configured to process the current charge capacity based on a first preset charge-discharge capacity model to obtain a current discharge capacity when the current charge capacity is smaller than a first charge threshold; the first charge threshold is less than the zero capacity.
For specific limitations of the battery level testing device, reference may be made to the above limitations of the battery level testing method, and no further description is given herein. The modules in the battery power testing device can be all or partially realized by software, hardware and a combination thereof. The above modules may be embedded in hardware or may be independent of a processor in the processing device, or may be stored in software in a memory in the processing device, so that the processor may call and execute operations corresponding to the above modules.
In one embodiment, as shown in fig. 9, the present application provides a battery testing system, including a processing device 910 and a charging and discharging apparatus 920 for charging and discharging a battery 930 to be tested; the processing device 910 is connected with a charge-discharge device 920; the processing device 910 is configured to perform the steps of the battery level testing method as described above.
The charge and discharge device 920 may include a charge and discharge cabinet, the battery 930 to be tested is electrically connected with the charge and discharge cabinet, and the processing device 910 is connected with the charge and discharge cabinet in a communication manner, so as to realize charge and discharge test control of the charge and discharge cabinet, and collect test data of the battery 930 to be tested.
Based on the processing device 910 being connected to the charge-discharge device 920, the charge-discharge device 920 is connected to the battery 930 to be tested, and the processing device 910 obtains the first discharge capacity and the second discharge capacity of the battery 930 to be tested; the first discharge capacity is obtained by performing capacity test on the battery 930 to be tested based on the first temperature; the second discharge capacity is obtained by performing capacity test on the battery 930 to be tested based on the second temperature; obtaining zero capacity according to the first discharge capacity and the second discharge capacity; acquiring the current charge capacity of the battery 930 to be tested; when the current charge capacity is smaller than the first charge threshold, the current charge capacity is processed based on a first preset charge-discharge capacity model to obtain the current discharge capacity of the battery 930 to be tested, so that accurate judgment of the current dischargeable capacity of the battery 930 to be tested is realized.
In the above embodiment, the first discharge capacity and the second discharge capacity are obtained by performing capacity test on the battery to be tested at different temperatures; the zero capacity is obtained by processing the first discharge capacity and the second discharge capacity; through pre-establishing a first preset charge-discharge capacity model, when the current electric quantity of the battery to be measured still can be determined, the current charge capacity can be compared with a first charge threshold value, if the current charge capacity is smaller than the first charge threshold value, the current charge capacity is input into the first preset charge-discharge capacity model for processing, the current discharge capacity corresponding to the battery to be measured is obtained, the accurate determination of the electric quantity of the battery to be measured still can be determined in the current state is realized, the electric quantity of the battery can be determined in a small quantity of electric states, the discharge capacity test error is reduced, and the test accuracy of the discharge capacity is improved.
It will be appreciated by those skilled in the art that the structure shown in fig. 9 is merely a block diagram of a portion of the structure associated with the present application and is not limiting of the processing apparatus to which the present application is applied, and that a particular processing apparatus may include more or fewer components than shown, or may combine certain components, or have a different arrangement of components.
In one embodiment, there is also provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the battery level testing method of any one of the above.
For example, the computer program when executed by the processor performs the steps of a battery charge testing method as follows:
acquiring a first discharge capacity and a second discharge capacity of a battery to be tested; the first discharge capacity is obtained by performing capacity test on the battery to be tested based on the first temperature; the second discharge capacity is obtained by performing capacity test on the battery to be tested based on the second temperature; obtaining zero capacity according to the first discharge capacity and the second discharge capacity; acquiring the current charge capacity of a battery to be tested; when the current charge capacity is smaller than a first charge threshold value, processing the current charge capacity based on a first preset charge-discharge capacity model to obtain a current discharge capacity; the first charging threshold value is smaller than the zero capacity, so that accurate judgment of the current dischargeable capacity of the battery to be tested is realized.
Those skilled in the art will appreciate that implementing all or part of the above-described embodiments of the method may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of embodiments of the division methods described above. Any reference to memory, storage, database, or other medium used in the various embodiments provided herein may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double Data Rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. The battery electric quantity testing method is characterized by comprising the following steps of:
acquiring a first discharge capacity and a second discharge capacity of a battery to be tested; the first discharge capacity is obtained by performing capacity test on the battery to be tested based on a first temperature; the second discharge capacity is obtained by performing capacity test on the battery to be tested based on a second temperature;
Obtaining zero point capacity according to the first discharge capacity and the second discharge capacity;
acquiring the current charging capacity of the battery to be tested;
when the current charge capacity is smaller than a first charge threshold, processing the current charge capacity based on a first preset charge-discharge capacity model to obtain a current discharge capacity; the first charge threshold is less than the zero capacity.
2. The battery power testing method according to claim 1, wherein the step of obtaining the current charge capacity of the battery to be tested includes:
when the current charge capacity is larger than a second charge threshold, processing the current charge capacity based on a second preset charge-discharge capacity model to obtain the current discharge capacity; the second charge threshold is greater than the zero capacity.
3. The battery power testing method according to claim 1, wherein the obtaining of the first preset charge-discharge capacity model includes:
based on the first multiplying power, the first temperature and the first charging threshold, performing charging test on the battery to be tested to obtain a plurality of first test charging capacities;
performing discharge test on the battery to be tested based on the first multiplying power, the second temperature and the first cut-off voltage to obtain a plurality of first test discharge capacities corresponding to the first test charge capacities; the first temperature is greater than the second temperature;
And establishing a first preset charge-discharge capacity model corresponding to the battery to be tested according to the first test charge capacities and the first test discharge capacities.
4. The method for testing the battery power according to claim 3, wherein the step of performing the charge test on the battery to be tested based on the first multiplying power, the first temperature and the first charge threshold value to obtain a plurality of first test charge capacities includes:
and discharging the battery to be tested based on the first temperature and the first multiplying power until the voltage of the battery to be tested is the first cut-off voltage.
5. The battery power testing method according to claim 2, wherein the obtaining of the second preset charge-discharge capacity model includes:
based on the first multiplying power, the first temperature and the second charging threshold, performing charging test on the battery to be tested to obtain a plurality of second test charging capacities;
performing discharge test on the battery to be tested based on the first multiplying power, the second temperature and the first cut-off voltage to obtain a plurality of second test discharge capacities corresponding to the second test charge capacities;
and establishing a second preset charge-discharge capacity model corresponding to the battery to be tested according to the second test charge capacities and the second test discharge capacities.
6. The method for testing the electric quantity of a battery according to claim 5, wherein the step of performing a charging test on the battery to be tested based on the first multiplying power, the first temperature and the second charging threshold value to obtain a plurality of second test charging capacities includes:
and discharging the battery to be tested based on the first temperature and the first multiplying power until the voltage of the battery to be tested is the first cut-off voltage.
7. The battery charge testing method according to any one of claims 1 to 6, wherein the obtaining of the first discharge capacity includes:
based on the first multiplying power, the first temperature and the second cut-off voltage, performing a charging test on the battery to be tested until the voltage of the battery to be tested is the second cut-off voltage;
performing discharge test on the battery to be tested charged to the second cutoff voltage based on the first multiplying power and the first temperature until the voltage of the battery to be tested is the first cutoff voltage, so as to obtain a plurality of first single discharge capacities;
and carrying out average value processing on each first single discharge capacity to obtain the first discharge capacity.
8. The battery charge testing method according to claim 7, wherein the obtaining of the second discharge capacity includes:
Based on the first multiplying power, the third temperature and the second cut-off voltage, performing a charging test on the battery to be tested until the voltage of the battery to be tested is the second cut-off voltage;
performing discharge test on the battery to be tested charged to the second cutoff voltage based on the first multiplying power and the second temperature until the voltage of the battery to be tested is the first cutoff voltage, so as to obtain a plurality of second single discharge capacities; the second temperature is less than the third temperature, which is less than the first temperature;
and carrying out average value processing on each second single discharge capacity to obtain the second discharge capacity.
9. A battery power testing device, comprising:
the discharge capacity acquisition module is used for acquiring a first discharge capacity and a second discharge capacity of the battery to be tested; the first discharge capacity is obtained by performing capacity test on the battery to be tested based on a first temperature; the second discharge capacity is obtained by performing capacity test on the battery to be tested based on a second temperature;
the zero capacity processing module is used for obtaining zero capacity according to the first discharge capacity and the second discharge capacity;
The charging capacity acquisition module is used for acquiring the current charging capacity of the battery to be tested;
the electric quantity calculation module is used for processing the current charge capacity based on a first preset charge-discharge capacity model to obtain the current discharge capacity when the current charge capacity is smaller than a first charge threshold; the first charge threshold is less than the zero capacity.
10. The battery test system is characterized by comprising processing equipment and a charging and discharging device for charging and discharging a battery to be tested; the processing equipment is connected with the charging and discharging device;
the processing device is configured to perform the steps of the battery charge testing method according to any one of claims 1 to 8.
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