CN113125980A - Method and device for detecting direct current internal resistance of battery and terminal equipment - Google Patents
Method and device for detecting direct current internal resistance of battery and terminal equipment Download PDFInfo
- Publication number
- CN113125980A CN113125980A CN202110244691.XA CN202110244691A CN113125980A CN 113125980 A CN113125980 A CN 113125980A CN 202110244691 A CN202110244691 A CN 202110244691A CN 113125980 A CN113125980 A CN 113125980A
- Authority
- CN
- China
- Prior art keywords
- charge
- state
- battery
- voltage
- internal resistance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
Abstract
The application is applicable to the technical field of battery detection, and provides a method and a device for detecting direct current internal resistance of a battery and terminal equipment, wherein the method comprises the following steps: acquiring first information and second information of a battery to be detected in two charging processes, wherein the charging currents used in the two charging processes are different; obtaining a target state of charge of the battery based on the first information and the second information; obtaining the direct current internal resistance of the battery in the target charge state based on the first voltage, the first current, the second voltage and the second current corresponding to the target charge state; when the direct current internal resistance of the battery is measured, the battery does not need to be discharged and kept stand, and the detection efficiency of the direct current internal resistance of the battery is accelerated.
Description
Technical Field
The application belongs to the technical field of battery detection, and particularly relates to a method and a device for detecting direct current internal resistance of a battery and terminal equipment.
Background
The direct current internal resistance of the battery is often one of the indexes for judging whether the battery is healthy or not. Therefore, during the use of the battery, the state of health of the battery is often monitored by detecting the direct-current internal resistance of the battery.
At present, a method for detecting the direct current internal resistance of a battery discharges the battery to a certain charge state through a discharge current, then measures the open-circuit voltage of the battery corresponding to the charge state after standing for a period of time, and finally calculates the direct current internal resistance of the battery through the open-circuit voltage. When the method is used for measuring the direct current internal resistance of the battery, because long time is consumed for measuring the open circuit voltage corresponding to the state of charge, the efficiency of detecting the direct current internal resistance of the battery by the method is low.
Disclosure of Invention
The embodiment of the application provides a method and a device for detecting the direct current internal resistance of a battery and terminal equipment, and can solve the problem of low efficiency of monitoring the direct current internal resistance of the battery at present.
In a first aspect, an embodiment of the present application provides a method for detecting a direct current internal resistance of a battery, including:
acquiring first information and second information of a battery to be detected in two charging processes, wherein the first information comprises first voltage and first current of the battery at different moments in the ith charging process, the second information comprises second voltage and second current of the battery at different moments in the (i + n) th charging process, i is not less than 1, n is not less than 1, and the charging current used in the ith charging process is different from the charging current used in the (i + n) th charging process;
obtaining a target state of charge of the battery based on the first information and the second information;
and obtaining the direct current internal resistance of the battery in the target charge state based on the first voltage, the first current, the second voltage and the second current corresponding to the target charge state.
In a second aspect, an embodiment of the present application provides a device for detecting a direct current internal resistance of a battery, including:
the information acquisition module is used for acquiring first information and second information of a battery to be detected in two charging processes, wherein the first information comprises first voltage and first current of the battery at different moments in the ith charging process, the second information comprises second voltage and second current of the battery at different moments in the (i + n) th charging process, i is not less than 1, n is not less than 1, and the charging current used in the ith charging process is different from the charging current used in the (i + n) th charging process;
the state of charge determining module is used for obtaining the target state of charge of the battery based on the first information and the second information;
and the direct current internal resistance calculation module is used for obtaining the direct current internal resistance of the battery in the target charge state based on the first voltage, the first current, the second voltage and the second current corresponding to the target charge state.
In a third aspect, an embodiment of the present application provides a terminal device, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method for detecting the dc internal resistance of the battery according to any one of the first aspect when executing the computer program.
In a fourth aspect, the present embodiment provides a computer-readable storage medium, where a computer program is stored, where the computer program is executed by a processor to implement the method for detecting the direct current internal resistance of the battery according to any one of the above first aspects.
In a fifth aspect, the present application provides a computer program product, when the computer program product runs on a terminal device, the terminal device is caused to execute the method for detecting the direct current internal resistance of the battery according to any one of the first aspect.
It is understood that the beneficial effects of the second aspect to the fifth aspect can be referred to the related description of the first aspect, and are not described herein again.
Compared with the prior art, the embodiment of the application has the advantages that: the method comprises the steps of charging the same battery twice by using different charging currents, acquiring first information and second information of the battery to be detected in the charging process twice, and obtaining a target charge state of the battery based on the first information and the second information; obtaining the direct current internal resistance of the battery in the target charge state based on the first voltage, the first current, the second voltage and the second current corresponding to the target charge state; when the direct current internal resistance of the battery is measured, the battery does not need to be discharged and kept stand, and the detection efficiency of the direct current internal resistance of the battery is accelerated.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic view of an application scenario of a method for detecting a dc internal resistance of a battery according to an embodiment of the present application;
fig. 2 is a schematic flowchart of a method for detecting dc internal resistance of a battery according to an embodiment of the present application;
fig. 3 is a schematic flowchart of a method for calculating dc internal resistance according to an embodiment of the present application;
FIG. 4 is a schematic flow chart diagram illustrating a method for determining a target state of charge according to an embodiment of the present disclosure;
fig. 5 is a flowchart illustrating a method for determining the target state of charge in step S1023 in fig. 4 according to an embodiment of the present application;
FIG. 6 is a schematic flow chart diagram illustrating a method for determining maximum state of charge according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a device for detecting dc internal resistance of a battery according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in the specification of this application and the appended claims, the term "if" may be interpreted contextually as "when … …" or "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
Fig. 1 is a schematic view of an application scenario of a method for detecting a direct-current internal resistance of a battery according to an embodiment of the present application, where the method for detecting a direct-current internal resistance of a battery can be used to obtain a direct-current internal resistance of a battery. The processor 10 obtains first information and second information of the battery 20 in two charging processes, and determines the direct current internal resistance of the battery at the target state of charge according to the first information and the second information.
The method for detecting the direct current internal resistance of the battery according to the embodiment of the present application is described in detail below with reference to fig. 1.
Fig. 2 shows a schematic flow chart of a method for detecting the direct current internal resistance of the battery provided by the present application, and with reference to fig. 2, the method is described in detail as follows:
s101, first information and second information of a battery to be detected in two charging processes are obtained, wherein the first information comprises first voltage and first current of the battery at different moments in the ith charging process, the second information comprises second voltage and second current of the battery at different moments in the (i + n) th charging process, i is not less than 1, n is not less than 1, and the charging current used in the ith charging process is different from the charging current used in the (i + n) th charging process.
In this embodiment, a battery is charged twice when the electric quantity is not full, and the battery is denoted as a battery to be detected in this application. The charging currents used when the battery to be detected is charged twice are different, one time, the battery can be charged by using larger current, and the other time, the battery can be charged by using smaller current. The larger current can be 1C, 1.5C or 2C and the like which meet the battery requirements, and the smaller current can be 0.2C, 0.3C or 0.4C and the like. The difference of the charging currents used for charging for two times can be not less than a preset value, and the preset value can be set according to needs.
In the present embodiment, the data of the selected two-time charging may be two times of continuous charging of the battery, for example, when n is 1. After the battery is circularly charged for a certain number of times, the change of the internal resistance of the battery is not large, so that the first information and the second information of randomly selected two times of charging can be obtained by optionally charging the battery twice from m times of charging of the battery. For example, n > 1.
In this embodiment, the first information may be a real-time current and a real-time voltage during the charging process, which are referred to as a first current and a first voltage at different times in this application. The second information may be a real-time current and a real-time voltage during the charging process, which are referred to as a second current and a second voltage at different times in this application.
In the present embodiment, the first information and the second information may be obtained from the current-voltage detection device.
And S102, obtaining the target state of charge of the battery based on the first information and the second information.
In the present embodiment, the state of charge (statecharge-SOC) is one value.
In this embodiment, the target state of charge is a state of charge that can be achieved by the battery to be detected in the charging process, and the direct current internal resistance of the battery calculated in the target state of charge is more accurate.
S103, obtaining the direct current internal resistance of the battery in the target charge state based on the first voltage, the first current, the second voltage and the second current corresponding to the target charge state.
In this embodiment, the target states of charge may be one or more, the direct current internal resistances corresponding to the target states of charge are different, and the direct current internal resistance in the target state of charge may be obtained based on the first information and the second information of the battery in the target state of charge.
By way of example, if the target state of charge is 30%, 50%, and 70%. The direct current internal resistance when the target charge state is 30%, the direct current internal resistance when the target charge state is 50% and the direct current internal resistance when the target charge state is 70% can be obtained through calculation.
As shown in fig. 3, specifically, the implementation process of step S103 may include:
s1031, calculating a first difference between the first voltage and the second voltage;
s1032, calculating a second difference between the first current and the second current;
and S1033, taking the ratio of the first difference value to the second difference value as the direct current internal resistance of the battery in the target state of charge.
In this embodiment, the formula can be based on
Wherein R is the DC internal resistance at the target state of charge, V1Is a first voltage, V2Is a second voltage, I1Is a first current, I2Is the second current.
In the embodiment of the application, the same battery is charged twice by using different charging currents, first information and second information of the battery to be detected in the charging process of twice are obtained, and the target charge state of the battery is obtained based on the first information and the second information; obtaining the direct current internal resistance of the battery in the target charge state based on the first voltage, the first current, the second voltage and the second current corresponding to the target charge state; when the direct current internal resistance of the battery is measured, the battery does not need to be discharged and kept stand, and the detection efficiency of the direct current internal resistance of the battery is accelerated.
In a possible implementation manner, after step S103, the method may further include:
and S104, determining whether the battery is in an aging state or not based on the direct-current internal resistance of the battery in the target charge state and the reference internal resistance of the battery in the target charge state.
In this embodiment, a newly shipped battery corresponds to a reference internal resistance in each state of charge, and whether the battery to be monitored is in an aging state can be determined by comparing the current direct-current internal resistance of the battery to be detected with the reference internal resistance.
In this embodiment, if the difference between the dc internal resistance and the corresponding reference internal resistance is within a preset range, it is determined that the battery is in an aged state. The preset range may be set as desired.
By way of example, if the battery has 3 target states of charge. The target states of charge are 30%, 50% and 70%, respectively. The difference between the direct current internal resistance at the target state of charge of 30% and the reference internal resistance at the target state of charge of 30% was calculated to be 0.01 Ω, the difference between the direct current internal resistance at the target state of charge of 50% and the reference internal resistance at the target state of charge of 50% was calculated to be 0.02 Ω, and the difference between the direct current internal resistance at the target state of charge of 70% and the reference internal resistance at the target state of charge of 70% was calculated to be 0.015 Ω.
If the preset range is 0.1-0.2, and none of the above 0.01 Ω, 0.02 Ω, and 0.015 Ω is within the preset range, the battery is not in an aged state.
In the embodiment of the application, whether the battery is aged or not is determined through the difference value of the direct-current internal resistance of the battery in the target charge state and the reference internal resistance of the battery in the target charge state, so that the aging of the battery can be detected, and the aged battery can be replaced in time.
As shown in fig. 4, in a possible implementation manner, the implementation process of step S102 may include:
and S1021, obtaining first charge states of the battery at different moments in the ith charging process based on the first current.
In this embodiment, the state of charge of the battery at different times can be obtained by using the first current through a current integration method, and is referred to as the first state of charge in this application.
And S1022, obtaining second charge states of the battery at different moments in the i + n charging process based on the second current.
In this embodiment, the state of charge of the battery at different times, which is referred to as the second state of charge in this application, may be obtained by using a current integration method and using the second current.
S1023, determining the target state of charge based on the first state of charge and the second state of charge.
Specifically, the same state of charge of the first state of charge and the second state of charge may be searched, and the target state of charge may be determined based on the same state of charge.
As shown in fig. 5, specifically, the implementation process of step S1023 may include:
and S10231, determining the same state of charge in the first state of charge and the second state of charge.
In this embodiment, the state of charge of the battery in the same state of charge when charging twice is searched, and is referred to as the same state of charge in this application.
As an example, if the first state of charge at each time is 30%, 40%, 45%, 60%, 70%, 80%, 90%, and 100% at one charge, respectively. The second states of charge at various times during another charge are 40%, 50%, 62%, 75%, 80%, 90% and 100%, respectively. The same states of charge are 40%, 80%, 90% and 100%.
And S10232, taking the minimum value in the same state of charge as the minimum state of charge.
By way of example, if the same state of charge is 40%, 80%, 90% and 100%. The minimum value is 40% and the minimum state of charge is 40%.
And S10233, determining the maximum charge state based on the first voltage and the second voltage.
In the present embodiment, the voltage of the battery is increasing during the charging process of the battery, but at the later stage of the charging, the battery is charged in a CV charging mode, where the CV charging mode refers to a charging mode in which the voltage of the battery is not changed. Therefore, the voltages of the batteries in the later stages of the two charging are the same, and if the direct current internal resistance calculated by using the voltage difference of the batteries in the later stages of the two charging is equal to 0, the maximum state of charge cannot be the state of charge of the batteries reaching the same voltage in the two charging processes.
As shown in fig. 6, specifically, the implementation process of step S10233 may include:
and S102331, determining a first candidate state of charge based on the first state of charge and the second state of charge, wherein the first candidate state of charge is the minimum value of the first state of charge and the second state of charge corresponding to a first moment, and the first moment is the moment when the charging voltage in the ith charging process and the (i + n) th charging process is the same for the first time.
In this embodiment, since the battery is charged at a constant voltage in the later stage of charging, the battery is charged at a constant voltage after reaching the same voltage in both charging processes. If two curves are plotted for the voltage of two charges, the two curves will intersect at a point and the curves after that point will coincide completely. That is, the voltages at the curve superposition stage are the same, and the state of charge at the curve superposition stage cannot be used for calculating the direct current internal resistance of the battery, so that the maximum state of charge is not at the curve superposition stage. The time when the two curves are firstly overlapped needs to be found, which is referred to as a first time in the application, and a first charge state and a second charge state corresponding to the first time are determined. Since the first state of charge and the second state of charge are both incremental, the maximum state of charge is less than or equal to the minimum of the first state of charge and the second state of charge corresponding to the first time.
As an example, if the first time is 30 minutes, the first time corresponds to a first state of charge of 80%, and the first time corresponds to a second state of charge of 76%, the first candidate state of charge is 76%.
And S102332, determining a second candidate state of charge based on the same state of charge, wherein the second candidate state of charge is a state of charge which is smaller than or equal to the first candidate state of charge in the same state of charge.
In the present embodiment, the same state of charge less than or equal to the first candidate state of charge is taken as the second candidate state of charge.
By way of example, if the first state of charge is 76% and the same state of charge includes 40%, 50%, 70%, 80%, then the second candidate state of charge includes 40%, 50%, 70% of the same state of charge.
Optionally, the same state of charge that is less than or equal to the first candidate state of charge and greater than the preset state of charge may be used as the second candidate state of charge. The preset state of charge may be set as desired.
S102333, a first difference between the first voltage and the second voltage corresponding to the second candidate state of charge is calculated.
And S102334, obtaining the maximum state of charge based on the first difference.
Specifically, a second difference value is obtained based on the first difference value, wherein the second difference value is a difference value which is greater than or equal to a preset threshold value in the first difference value; and taking the maximum value in the second candidate state of charge corresponding to the second difference value as the maximum state of charge.
In this embodiment, if the first difference is smaller, the error of the finally obtained direct current internal resistance is larger, so when the maximum state of charge is determined, a preset threshold may be set, and the maximum value of the second candidate state of charge corresponding to the first difference larger than the preset threshold is used as the maximum state of charge.
Specifically, the determination of the preset threshold may be determined according to the calculation accuracy of the internal resistance. The calculation accuracy of the internal resistance is the same as the accuracy of the difference between the first voltage and the second voltage.
As an example, if the calculation accuracy of the internal resistance is 5%, the accuracy of the differential pressure between the first voltage and the second voltage is 5%, and if the accuracy of the voltage of the battery is 0.002V, the differential pressure corresponding to 0.002V is 0.002/5% ═ 0.04V, and thus the minimum value of the differential pressure between the first voltage and the second voltage is 0.04V. The preset threshold may be set to 0.04V.
By way of example, if the preset threshold is 0.04V, the first difference values are 0.03V, 0.05V, 0.06V, respectively, and the second difference value greater than or equal to 0.04V is 0.05V, 0.06V. The second candidate state of charge corresponding to 0.05V is 60%, and the second candidate state of charge corresponding to 0.06V is 70%, then the second candidate state of charge of 70% is taken as the maximum state of charge.
And S10234, obtaining a set comprising at least one target state of charge based on the minimum state of charge and the maximum state of charge.
In this embodiment, the same states of charge are arranged in order from small to large to obtain the arranged states of charge.
All of the same states of charge in the ranked states of charge from the minimum state of charge to the maximum state of charge comprise the set of target states of charge. The states of charge included in the set of target states of charge are all target states of charge.
By way of example, if the same state of charge includes 40%, 50%, 60%, 70%, 80%, and 100%. If the minimum state of charge is 40% and the maximum state of charge is 70%, then the set of target states of charge includes 40%, 50%, 60%, and 70% states of charge. 40%, 50%, 60% and 70% can be taken as one target state of charge.
In the embodiment of the application, the target state of charge which can be determined based on the first state of charge, the second state of charge, the first voltage and the second voltage is more accurate, and the direct current internal resistance of the battery calculated in the target state of charge is more accurate, that is, the accurate target state of charge is obtained, so that the calculated direct current internal resistance of the battery is more accurate.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
Fig. 7 shows a block diagram of a device for detecting the dc internal resistance of the battery according to the embodiment of the present application, which corresponds to the method for detecting the dc internal resistance of the battery according to the foregoing embodiment, and only shows the relevant parts according to the embodiment of the present application for convenience of description.
Referring to fig. 7, the apparatus 200 may include: the system comprises an information acquisition module 210, a state of charge determination module 220 and a direct current internal resistance calculation module 230.
The information acquisition module 210 is configured to acquire first information and second information of a battery to be detected in two charging processes, where the first information includes first voltage and first current of the battery at different times in an ith charging process, the second information includes second voltage and second current of the battery at different times in an (i + n) th charging process, i is greater than or equal to 1, n is greater than or equal to 1, and a charging current used in the ith charging process is different from a charging current used in the (i + n) th charging process;
a state of charge determining module 220, configured to obtain a target state of charge of the battery based on the first information and the second information;
the direct current internal resistance calculation module 230 is configured to obtain a direct current internal resistance of the battery in the target state of charge based on the first voltage, the first current, the second voltage, and the second current corresponding to the target state of charge.
In a possible implementation manner, the direct current internal resistance calculation module 230 may specifically be configured to:
calculating a first difference between the first voltage and the second voltage;
calculating a second difference between the first current and the second current;
and taking the ratio of the first difference value to the second difference value as the direct current internal resistance of the battery at the target state of charge.
In a possible implementation manner, the connection with the direct current internal resistance calculation module 230 further includes:
and the state determining module is used for determining whether the battery is in an aging state or not based on the direct-current internal resistance of the battery in the target charge state and the reference internal resistance of the battery in the target charge state.
In a possible implementation manner, the state of charge determining module 220 may specifically include:
the first calculation unit is used for obtaining first charge states of the battery at different moments in the ith charging process based on the first current;
the second calculation unit is used for obtaining second charge states of the battery at different moments in the (i + n) th charging process based on the second current;
a state determination unit for determining the target state of charge based on the first state of charge and the second state of charge.
In a possible implementation manner, the state determining unit may specifically include:
a state of charge determining subunit, configured to determine a same state of charge of the first state of charge and the second state of charge;
a minimum state of charge determining subunit, configured to take a minimum value in the same state of charge as a minimum state of charge;
a maximum state of charge determining subunit for determining a maximum state of charge based on the first voltage and the second voltage;
a target state of charge determining subunit for deriving a set comprising at least one of said target states of charge based on said minimum state of charge and said maximum state of charge.
In one possible implementation, the maximum state of charge determining subunit may be specifically configured to:
determining a first candidate state of charge based on the first state of charge and the second state of charge, wherein the first candidate state of charge is the minimum value of the first state of charge and the second state of charge corresponding to a first moment, and the first moment is the moment when the charging voltage in the ith charging process and the (i + n) th charging process is the same for the first time;
determining a second candidate state of charge based on the same state of charge, wherein the second candidate state of charge is a state of charge of the same state of charge that is less than or equal to the first candidate state of charge;
calculating a first difference value between a first voltage and a second voltage corresponding to the second candidate state of charge;
and obtaining the maximum state of charge based on the first difference.
In one possible implementation, the maximum state of charge determining subunit may be specifically configured to:
obtaining a second difference value based on the first difference value, wherein the second difference value is a difference value which is greater than a preset threshold value in the first difference value;
and taking the maximum value in the second candidate state of charge corresponding to the second difference value as the maximum state of charge.
It should be noted that, for the information interaction, execution process, and other contents between the above-mentioned devices/units, the specific functions and technical effects thereof are based on the same concept as those of the embodiment of the method of the present application, and specific reference may be made to the part of the embodiment of the method, which is not described herein again.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
An embodiment of the present application further provides a terminal device, and referring to fig. 8, the terminal device 400 may include: at least one processor 410, a memory 420, and a computer program stored in the memory 420 and executable on the at least one processor 410, wherein the processor 410 when executing the computer program implements the steps of any of the method embodiments described above, such as the steps S101 to S103 in the embodiment shown in fig. 2. Alternatively, the processor 410, when executing the computer program, implements the functions of the modules/units in the above-described device embodiments, such as the functions of the modules 210 to 230 shown in fig. 7.
Illustratively, a computer program may be partitioned into one or more modules/units, which are stored in the memory 420 and executed by the processor 410 to accomplish the present application. The one or more modules/units may be a series of computer program segments capable of performing specific functions, which are used to describe the execution of the computer program in the terminal device 400.
Those skilled in the art will appreciate that fig. 8 is merely an example of a terminal device and is not limiting and may include more or fewer components than shown, or some components may be combined, or different components such as input output devices, network access devices, buses, etc.
The Processor 410 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 420 may be an internal storage unit of the terminal device, or may be an external storage device of the terminal device, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like. The memory 420 is used for storing the computer programs and other programs and data required by the terminal device. The memory 420 may also be used to temporarily store data that has been output or is to be output.
The bus may be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, an Extended ISA (EISA) bus, or the like. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, the buses in the figures of the present application are not limited to only one bus or one type of bus.
The method for dynamically expanding the relational database provided by the embodiment of the application can be applied to terminal devices such as computers, tablet computers, notebook computers, netbooks, Personal Digital Assistants (PDAs) and the like, and the embodiment of the application does not limit the specific types of the terminal devices at all.
The embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored, and when the computer program is executed by a processor, the computer program implements the steps in the embodiments of the method described above.
The embodiment of the present application provides a computer program product, which when running on a mobile terminal, enables the mobile terminal to implement the steps in the embodiments of the method when executed.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the processes in the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium and can implement the steps of the embodiments of the methods described above when the computer program is executed by a processor. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include at least: any entity or device capable of carrying computer program code to a photographing apparatus/terminal apparatus, a recording medium, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), an electrical carrier signal, a telecommunications signal, and a software distribution medium. Such as a usb-disk, a removable hard disk, a magnetic or optical disk, etc. In certain jurisdictions, computer-readable media may not be an electrical carrier signal or a telecommunications signal in accordance with legislative and patent practice.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/network device and method may be implemented in other ways. For example, the above-described apparatus/network device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A method for detecting the direct current internal resistance of a battery is characterized by comprising the following steps:
acquiring first information and second information of a battery to be detected in two charging processes, wherein the first information comprises first voltage and first current of the battery at different moments in the ith charging process, the second information comprises second voltage and second current of the battery at different moments in the (i + n) th charging process, i is not less than 1, n is not less than 1, and the charging current used in the ith charging process is different from the charging current used in the (i + n) th charging process;
obtaining a target state of charge of the battery based on the first information and the second information;
and obtaining the direct current internal resistance of the battery in the target charge state based on the first voltage, the first current, the second voltage and the second current corresponding to the target charge state.
2. The method for detecting the direct current internal resistance of the battery according to claim 1, wherein the obtaining the direct current internal resistance of the battery at the target state of charge based on the first voltage, the first current, the second voltage and the second current corresponding to the target state of charge comprises:
calculating a first difference between the first voltage and the second voltage;
calculating a second difference between the first current and the second current;
and taking the ratio of the first difference value to the second difference value as the direct current internal resistance of the battery at the target state of charge.
3. The method for detecting the direct current internal resistance of the battery according to claim 1, wherein after obtaining the direct current internal resistance of the battery at the target state of charge based on the first voltage, the first current, the second voltage and the second current corresponding to the target state of charge, the method comprises:
determining whether the battery is in an aging state based on the direct-current internal resistance of the battery at the target state of charge and the reference internal resistance of the battery at the target state of charge.
4. The method for detecting the direct current internal resistance of the battery according to claim 1, wherein the obtaining the target state of charge of the battery based on the first information and the second information comprises:
obtaining first charge states of the battery at different moments in the ith charging process based on the first current;
obtaining a second charge state of the battery at different moments in the (i + n) th charging process based on the second current;
determining the target state of charge based on the first state of charge and the second state of charge.
5. The method for detecting the internal dc resistance of the battery according to claim 4, wherein the determining the target state of charge based on the first state of charge and the second state of charge comprises:
determining a same state of charge of the first state of charge and the second state of charge;
taking the minimum value in the same state of charge as the minimum state of charge;
determining a maximum state of charge based on the first voltage and the second voltage;
based on the minimum and maximum states of charge, a set is derived that includes at least one of the target states of charge.
6. The method for detecting the direct current internal resistance of the battery according to claim 5, wherein the determining the maximum state of charge based on the first voltage and the second voltage comprises:
determining a first candidate state of charge based on the first state of charge and the second state of charge, wherein the first candidate state of charge is the minimum value of the first state of charge and the second state of charge corresponding to a first moment, and the first moment is the moment when the charging voltage in the ith charging process and the (i + n) th charging process is the same for the first time;
determining a second candidate state of charge based on the same state of charge, wherein the second candidate state of charge is a state of charge of the same state of charge that is less than or equal to the first candidate state of charge;
calculating a first difference value between a first voltage and a second voltage corresponding to the second candidate state of charge;
and obtaining the maximum state of charge based on the first difference.
7. The method for detecting the direct current internal resistance of the battery according to claim 6, wherein the obtaining the maximum state of charge based on the first difference value comprises:
obtaining a second difference value based on the first difference value, wherein the second difference value is a difference value which is greater than or equal to a preset threshold value in the first difference value;
and taking the maximum value in the second candidate state of charge corresponding to the second difference value as the maximum state of charge.
8. A detection device for battery direct current internal resistance is characterized by comprising:
the information acquisition module is used for acquiring first information and second information of a battery to be detected in two charging processes, wherein the first information comprises first voltage and first current of the battery at different moments in the ith charging process, the second information comprises second voltage and second current of the battery at different moments in the (i + n) th charging process, i is not less than 1, n is not less than 1, and the charging current used in the ith charging process is different from the charging current used in the (i + n) th charging process;
the state of charge determining module is used for obtaining the target state of charge of the battery based on the first information and the second information;
and the direct current internal resistance calculation module is used for obtaining the direct current internal resistance of the battery in the target charge state based on the first voltage, the first current, the second voltage and the second current corresponding to the target charge state.
9. A terminal device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the method for detecting the direct current internal resistance of a battery according to any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium storing a computer program, wherein the computer program is executed by a processor to implement the method for detecting the direct current internal resistance of a battery according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110244691.XA CN113125980B (en) | 2021-03-05 | 2021-03-05 | Method and device for detecting direct current internal resistance of battery and terminal equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110244691.XA CN113125980B (en) | 2021-03-05 | 2021-03-05 | Method and device for detecting direct current internal resistance of battery and terminal equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113125980A true CN113125980A (en) | 2021-07-16 |
| CN113125980B CN113125980B (en) | 2022-04-08 |
Family
ID=76772579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110244691.XA Active CN113125980B (en) | 2021-03-05 | 2021-03-05 | Method and device for detecting direct current internal resistance of battery and terminal equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113125980B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015133068A1 (en) * | 2014-03-03 | 2015-09-11 | パナソニックＩｐマネジメント株式会社 | Device for determining battery type and method for determining battery type |
| CN107045109A (en) * | 2017-05-19 | 2017-08-15 | 北京新能源汽车股份有限公司 | The DC internal resistance measuring method and device of battery |
| CN111812531A (en) * | 2019-04-11 | 2020-10-23 | 东莞新能安科技有限公司 | Battery state detection method, device and storage medium |
| CN112224088A (en) * | 2019-12-30 | 2021-01-15 | 蜂巢能源科技有限公司 | Charging control method, system and equipment |
| CN112305438A (en) * | 2020-09-15 | 2021-02-02 | 深圳新恒业电池科技有限公司 | Method and device for measuring internal resistance of battery, terminal and storage medium |
-
2021
- 2021-03-05 CN CN202110244691.XA patent/CN113125980B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015133068A1 (en) * | 2014-03-03 | 2015-09-11 | パナソニックＩｐマネジメント株式会社 | Device for determining battery type and method for determining battery type |
| CN107045109A (en) * | 2017-05-19 | 2017-08-15 | 北京新能源汽车股份有限公司 | The DC internal resistance measuring method and device of battery |
| CN111812531A (en) * | 2019-04-11 | 2020-10-23 | 东莞新能安科技有限公司 | Battery state detection method, device and storage medium |
| CN112224088A (en) * | 2019-12-30 | 2021-01-15 | 蜂巢能源科技有限公司 | Charging control method, system and equipment |
| CN112305438A (en) * | 2020-09-15 | 2021-02-02 | 深圳新恒业电池科技有限公司 | Method and device for measuring internal resistance of battery, terminal and storage medium |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113125980B (en) | 2022-04-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108287312B (en) | Sorting method, system and device for retired batteries | |
| CN111812531A (en) | Battery state detection method, device and storage medium | |
| CN109991545B (en) | Battery pack electric quantity detection method and device and terminal equipment | |
| US20150276885A1 (en) | Method of Computing State of Charge and Battery State of Charge Monitor | |
| CN108663634B (en) | Method and device for determining internal resistance of power battery | |
| CN111308354A (en) | Method and device for detecting state of health of battery, electronic equipment and storage medium | |
| CN109904542B (en) | Method and device for updating capacity of lithium ion battery pack and terminal equipment | |
| CN110470995B (en) | Method and system for acquiring remaining discharge time of battery and terminal equipment | |
| CN115113069A (en) | Estimation method of battery SOC and related device | |
| CN111191671A (en) | Electrical appliance waveform detection method and system, electronic equipment and storage medium | |
| CN114280485B (en) | SOC estimation and consistency estimation method, device and computer equipment | |
| CN113125980B (en) | Method and device for detecting direct current internal resistance of battery and terminal equipment | |
| CN112946482A (en) | Battery voltage estimation method, device, equipment and storage medium based on model | |
| CN115327391B (en) | Detection method and device based on echelon battery utilization | |
| CN115469239B (en) | Method and device for evaluating charge state consistency of battery system and electronic equipment | |
| WO2019234181A1 (en) | Method and apparatus for estimating a state of charge of a battery | |
| CN115436827A (en) | Insulation resistance detection method, device and equipment | |
| CN114355208A (en) | Battery fault determination method and device, electronic equipment and storage medium | |
| CN115389954A (en) | Battery capacity estimation method, electronic equipment and readable storage medium | |
| CN115113071A (en) | Battery SOC value correction method and related device | |
| CN115113061A (en) | Method and related device for correcting SOC of battery | |
| CN114114040A (en) | SOC correction method and device for battery pack and computer equipment | |
| CN114966453A (en) | Method and related device for acquiring remaining available energy of lithium battery | |
| CN115754825B (en) | Capacitance detection method and device and data board | |
| CN115656845B (en) | Method, device, terminal and storage medium for calculating battery electric quantity |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 518000, 217, Building 18, Guangqian Industrial Zone, Longzhu 3rd Road, Longguang Community, Taoyuan Street, Nanshan District, Shenzhen, Guangdong Province Patentee after: Shenzhen Yichi New Energy Technology Co.,Ltd. Address before: 518000 room 213, building 18, Nanshan Ruiyuan, Longzhu 3rd road, Taoyuan Street, Nanshan District, Shenzhen City, Guangdong Province Patentee before: Shenzhen Yichi Yundong Technology Co.,Ltd. |
|
| CP03 | Change of name, title or address |