CN114415047A - Method and device for determining internal resistance of battery and electronic equipment - Google Patents
Method and device for determining internal resistance of battery and electronic equipment Download PDFInfo
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- CN114415047A CN114415047A CN202210015399.5A CN202210015399A CN114415047A CN 114415047 A CN114415047 A CN 114415047A CN 202210015399 A CN202210015399 A CN 202210015399A CN 114415047 A CN114415047 A CN 114415047A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
Abstract
The application provides a method and a device for determining internal resistance of a battery and electronic equipment, wherein the method comprises the following steps: acquiring an initial data sample set of a battery to be tested in a single charging process within a specified time period; each data sample in the initial data sample set at least comprises a charging moment, an SOC value, a current value and a voltage value; performing data cleaning on the initial data sample set according to a preset rule to obtain a first sample pair set comprising a plurality of first sample pairs; each first sample pair consists of two adjacent data samples at the initial data sample set charging time; and determining a first internal resistance value of the battery to be tested in a single charging process in a specified time period according to the first sample pair set. The method and the device can improve the accuracy of the determination result of the internal resistance of the battery and reduce the cost required by determining the internal resistance of the battery.
Description
Technical Field
The present disclosure relates to the field of battery detection technologies, and in particular, to a method and an apparatus for determining internal resistance of a battery, and an electronic device.
Background
The internal resistance is an important technical index for measuring the performance of the battery. Under normal conditions, the battery with small internal resistance has strong discharge capacity, and the battery with large internal resistance has weak discharge capacity. The internal resistance of the battery comprises ohmic internal resistance and polarization internal resistance, and the ohmic internal resistance and the polarization internal resistance change along with different service conditions of the battery, wherein the ohmic internal resistance obeys ohm's law, and the polarization internal resistance does not obey ohm's law, so the ohmic internal resistance is easier to estimate compared with the polarization internal resistance.
At present, the common method for determining the internal resistance of the battery mainly comprises the following steps: the internal resistance of the battery is directly measured through the external equipment, and the internal resistance and the like are calculated based on battery parameters (such as SOC, current, voltage and the like) in the primary charging process. However, the existing internal resistance measurement method has the following disadvantages: (1) the cost is higher by directly measuring the internal resistance of the battery through the external equipment, and the problems of poor stability and low accuracy are solved; (2) the mode error of calculating the internal resistance based on the battery parameters in the primary charging process is large, and the influence of the using conditions of the battery on the primary charging process is large.
Disclosure of Invention
In view of the above, an object of the present application is to provide a method, an apparatus and an electronic device for determining internal resistance of a battery, so as to reduce the cost required for determining the internal resistance of the battery while improving the accuracy of the determination result of the internal resistance of the battery.
In a first aspect, an embodiment of the present application provides a method for determining internal resistance of a battery, where the method includes: acquiring an initial data sample set of a battery to be tested in a single charging process within a specified time period; wherein each data sample in the initial set of data samples comprises at least a charging time, a SOC value, a current value, and a voltage value; performing data cleaning on the initial data sample set according to a preset rule to obtain a first sample pair set comprising a plurality of first sample pairs; wherein each of the first sample pairs consists of two data samples adjacent to each other at a charging time in the initial data sample set; and determining a first internal resistance value of the battery to be tested in a single charging process in the specified time period according to the first sample pair set.
With reference to the first aspect, an embodiment of the present application provides a first possible implementation manner of the first aspect, where the step of performing data cleaning on the initial data sample set according to a preset rule to obtain a first sample pair set including a plurality of first sample pairs includes: forming a first initial sample pair by two adjacent data samples at the charging time in the initial data sample set to obtain a first initial sample pair set containing a plurality of first initial sample pairs; calculating the charging time interval, the current difference value and the voltage difference value of each first initial sample pair according to the charging time, the current value and the voltage value of the two data samples in each first initial sample pair; and taking the first initial sample pair meeting a first preset condition in the first initial sample pair set as the first sample pair to obtain a first sample pair set.
With reference to the first aspect, an embodiment of the present application provides a second possible implementation manner of the first aspect, where the meeting of the first preset condition at least includes one of: the charging time interval does not exceed a preset time threshold; the SOC values of two data samples in the same first initial sample pair are smaller than a preset SOC threshold value; the current value of the same first initial sample pair at the later charging moment is smaller than a preset current threshold value; the current difference value is within a preset current interval; the voltage difference value is within a preset voltage interval.
With reference to the first aspect, this application provides a third possible implementation manner of the first aspect, where the step of determining, according to the first sample pair set, a first internal resistance value of the battery to be tested in a single charging process in the specified time period includes: calculating to obtain a first instantaneous internal resistance of each first sample pair according to the voltage difference value and the current difference value of each first sample pair in the first sample pair set; and determining a first internal resistance value of the battery to be tested in a single charging process in the specified time period according to all the calculated first instant internal resistances.
With reference to the first aspect, an embodiment of the present application provides a fourth possible implementation manner of the first aspect, where the step of determining, according to all the calculated first instantaneous internal resistances, a first internal resistance value of the battery to be tested in a single charging process in the specified time period includes: calculating the average value of all the first instantaneous internal resistances according to all the calculated first instantaneous internal resistances; and determining the calculated average value as a first internal resistance value of the battery to be tested in a single charging process in the specified time period.
With reference to the first aspect, embodiments of the present application provide a fifth possible implementation manner of the first aspect, where the battery to be tested is suitable for a target vehicle; the data sample further includes identity information of the target vehicle; the battery to be tested is charged for multiple times within a specified time period; the method further comprises the following steps: acquiring a first internal resistance value of the battery to be tested in each charging process in the specified time period; and determining a second internal resistance value of the target vehicle in the specified time period according to the identity information and the acquired plurality of first internal resistance values.
With reference to the first aspect, an embodiment of the present application provides a sixth possible implementation manner of the first aspect, where the target vehicle is a vehicle belonging to a target vehicle type in a specified charging area within a specified time period; a plurality of target vehicles are in the designated charging area within the designated time period; the data sample further comprises area information of the specified charging area and vehicle type information of the target vehicle type; the method further comprises the following steps: acquiring second internal resistance values of all target vehicles in the specified charging area; and determining a third internal resistance value of the target vehicle type in the specified charging region in the specified time period according to the region information, the vehicle type information and the obtained plurality of second internal resistance values.
With reference to the first aspect, an embodiment of the present application provides a seventh possible implementation manner of the first aspect, where the method further includes: calculating discrete degree parameters of all the obtained second internal resistance values; and judging whether the second internal resistance value of each target vehicle is abnormal or not according to the third internal resistance value and the discrete degree parameter.
In a second aspect, an embodiment of the present application further provides an apparatus for determining internal resistance of a battery, where the apparatus includes: the data acquisition module is used for acquiring an initial data sample set of the battery to be detected in a single charging process within a specified time period; wherein the initial set of data samples comprises data samples for a plurality of different charging instants; wherein the data samples comprise at least a charging time, an SOC value, a current value, and a voltage value; the data cleaning module is used for carrying out data cleaning on the initial data sample set according to a preset rule to obtain a first sample pair set containing a plurality of first sample pairs; wherein each of the first sample pairs consists of two data samples adjacent to each other at a charging time in the initial data sample set; and the first internal resistance value determining module is used for determining a first internal resistance value of the battery to be tested in a single charging process in the specified time period according to the first sample pair set.
In a third aspect, an embodiment of the present application further provides an electronic device, which includes a processor and a memory, where the memory stores computer-executable instructions that can be executed by the processor, and the processor executes the computer-executable instructions to implement the method for determining the internal resistance of the battery.
The embodiment of the application provides a method and a device for determining internal resistance of a battery and an electronic device, wherein the method comprises the following steps: the method comprises the steps of firstly obtaining an initial data sample set of a battery to be tested in a single charging process in a specified time period (each data sample in the initial data sample set at least comprises a charging time, an SOC value, a current value and a voltage value), then carrying out data cleaning on the initial data sample set according to a preset rule to obtain a first sample pair set comprising a plurality of first sample pairs (each first sample pair is composed of two data samples adjacent to the charging time in the initial data sample set), and then determining a first internal resistance value of the battery to be tested in the single charging process in the specified time period according to the first sample pair set. By adopting the technology, after battery parameter data samples in a charging process of the battery are obtained within a period of time, data cleaning is carried out on the data samples according to a specific rule, so that a plurality of sample pairs consisting of two adjacent data samples at the charging time are obtained, and finally the internal resistance value of the battery in the charging process within the period of time is determined according to the sample pairs.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the detailed description of the present application or the technical solutions in the prior art, the drawings needed to be used in the detailed description of the present application or the prior art description will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic flowchart of a method for determining internal resistance of a battery according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a device for determining internal resistance of a battery according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of another apparatus for determining internal resistance of a battery according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of another apparatus for determining internal resistance of a battery according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the present application will be clearly and completely described below with reference to the embodiments, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The internal resistance is an important technical index for measuring the performance of the battery. Under normal conditions, the battery with small internal resistance has strong discharge capacity, and the battery with large internal resistance has weak discharge capacity. The internal resistance of the battery includes ohmic internal resistance and polarization internal resistance. For lithium ion batteries, the ohmic internal resistance of the battery mainly includes resistance formed by resistance of lithium ions when passing through an electrolyte, diaphragm resistance, resistance of an electrolyte-electrode interface, resistance of a current collector (copper aluminum foil, electrode), and the like, and the polarization internal resistance includes electrochemical polarization resistance in lithium ion insertion, extraction and ion diffusion transfer processes, resistance caused by concentration polarization, and the like. Ohmic internal resistance and polarization internal resistance change along with different battery use conditions, wherein the ohmic internal resistance obeys ohm's law, and the polarization internal resistance does not obey ohm's law, so the ohmic internal resistance is easier to estimate compared with the polarization internal resistance.
At present, the common method for determining the internal resistance of the battery mainly comprises the following steps: the internal resistance of the battery is directly measured through the external equipment, and the internal resistance and the like are calculated based on battery parameters (such as SOC, current, voltage and the like) in the primary charging process. However, the existing internal resistance measurement method has the following disadvantages: (1) the cost is higher by directly measuring the internal resistance of the battery through the external equipment, and the problems of poor stability and low accuracy are solved; (2) the mode error of calculating the internal resistance based on the battery parameters in the primary charging process is large, and the influence of the using conditions of the battery on the primary charging process is large.
Based on this, the method, the device and the electronic equipment for determining the internal resistance of the battery provided by the embodiment of the application can improve the accuracy of the determination result of the internal resistance of the battery and reduce the cost for determining the internal resistance of the battery.
The internal resistance of the battery mentioned in the embodiment of the application refers to ohmic internal resistance and is independent of polarization internal resistance.
To facilitate understanding of the present embodiment, first, a method for determining internal resistance of a battery disclosed in the embodiments of the present application is described in detail, referring to a schematic flow chart of a method for determining internal resistance of a battery shown in fig. 1, where the method may include the following steps:
step S102, acquiring an initial data sample set of a battery to be tested in a single charging process within a specified time period; wherein each data sample in the initial set of data samples comprises at least a charging time, a SOC value, a current value, and a voltage value.
The battery to be tested may be a single battery, or may be a battery pack composed of a plurality of battery cells, which is not limited to this. Taking a battery to be tested as an example of a battery pack carried on an electric vehicle, as a feasible implementation manner, when a certain electric vehicle charges the battery pack through a charging pile, the charging pile acquires battery parameters of the battery pack at different charging moments in real time, wherein the battery parameters can include an SOC value, a current value, a voltage value and the like; the voltage value acquired by the charging pile is the maximum single voltage value of the battery pack, so that the battery with the maximum single voltage in the battery pack is further determined, and the battery parameters can also comprise the number of the battery with the maximum single voltage in the battery pack; after the battery pack of the electric automobile is charged, battery parameter data of the electric automobile in the period from the beginning to the end of charging are stored in the charging pile, the data can be directly obtained through the existing charging pile data collector, the data belonging to the same charging time in the data are stored as a data sample, and therefore a plurality of data samples at different charging times are obtained, and an initial sample set is formed by the data samples.
Step S104, performing data cleaning on the initial data sample set according to a preset rule to obtain a first sample pair set comprising a plurality of first sample pairs; each first sample pair is composed of two data samples adjacent to the charging time in the initial data sample set.
The preset rule may be defined by the charging time, the SOC value, the current value, the voltage value, and the like of the data sample, and is not limited.
For convenience of operation, the step S104 may specifically adopt the following operation modes:
(1) two adjacent data samples at the charging time in the initial data sample set form a first initial sample pair, and a first initial sample pair set containing a plurality of the first initial sample pairs is obtained.
For convenience of description, three consecutive charging times in one charging process are respectively defined as t1, t2 and t3, wherein t1 is adjacent to t2 and t2 is a later time of t1, t2 is adjacent to t3 and t3 is a later time of t 2; defining the data samples of the three charging moments as sample 1, sample 2 and sample 3 respectively; forming a sample pair A by using the sample 1 and the sample 2, and forming a sample pair B by using the sample 2 and the sample 3; in a similar manner, data samples at other charging times during the charging process are processed, so that a plurality of sample pairs (i.e., the first initial sample pair) are obtained, and the sample pairs are grouped into a sample pair set (i.e., the first initial sample pair set).
(2) And calculating the charging time interval, the current difference value and the voltage difference value of each first initial sample pair according to the charging time, the current value and the voltage value of the two data samples in each first initial sample pair.
Continuing with the previous example, the current values of sample 1, sample 2, and sample 3 are defined as I1, I2, and I3, respectively, the voltage values of sample 1, sample 2, and sample 3 are defined as U1, U2, and U3, respectively, and the charging time interval Δ T of sample pair a is defined asACurrent difference Δ I for sample pair a, t2-t1ASample to a voltage difference Δ U, I2-I1ACharging time interval Δ T for sample pair B, U2-U1BCurrent difference Δ I for sample pair a, t3-t2BI3-I2, the difference in voltage Δ U between sample pair BBU3-U2; the charging time intervals, the current difference values and the voltage difference values of other sample pairs in the charging process are calculated in a similar operation mode.
(3) And taking the first initial sample pairs meeting the first preset condition in the first initial sample pair set as first sample pairs to obtain a first sample pair set.
As a feasible operation manner, each time an initial sample pair is obtained, whether the initial sample pair meets a first preset condition is judged, if so (that is, the initial sample pair meets the first preset condition), the initial sample pair is kept as a first sample pair, and if not (that is, the initial sample pair does not meet the first preset condition), the initial sample pair is removed.
In practical applications, considering that the change of the polarization internal resistance may interfere with the calculation of the ohmic internal resistance, the first predetermined condition may be defined to be satisfied by at least one of: the charging time interval does not exceed a preset time threshold; the SOC values of two data samples in the same first initial sample pair are smaller than a preset SOC threshold value; the current value of the same first initial sample pair at the later charging moment is smaller than a preset current threshold value; the current difference value is within a preset current interval and the voltage difference value is within a preset voltage interval. The preset time threshold, the preset SOC threshold, the preset current interval and the preset voltage interval may be determined according to actual conditions, and are not limited.
Following the previous example, obtaining Δ TA、ΔIA、ΔUA、ΔTB、ΔIB、ΔUBThen, if the sample pair a satisfies the first preset condition but the sample pair B does not satisfy the first preset condition, the sample pair a is retained as the first sample pair, and the sample pair B is rejected.
As a specific application example, the first preset condition may be satisfied as follows: the charging time interval does not exceed 30s, the SOC values of two data samples in the same first initial sample pair are less than 80%, the current value of the later charging time in the same first initial sample pair is less than 10A, the current difference is in the range of 10A-100A, and the voltage difference is in the range of 0V-1V.
Through the constraint of a first preset condition, the interval time of two adjacent charging moments is shorter, the current change amplitude and the voltage change amplitude of the battery in the interval time are smaller, the SOC value and the current value of the battery are not very large, the interference generated by the change of polarization internal resistance on the calculation of ohmic internal resistance is negligible, and therefore the interval time can be regarded as a relatively stable charging process, and based on the interval time, a plurality of sample pairs obtained through the operation modes from (1) to (3) can be used for accurately determining the internal resistance of the battery in one-time charging process.
And step S106, determining a first internal resistance value of the battery to be tested in a single charging process in the specified time period according to the first sample pair set.
For convenience of operation, the operation manner of the following steps 1 to 2 may be specifically adopted in the step S106:
step 1, calculating to obtain a first instantaneous internal resistance of each first sample pair according to the voltage difference value and the current difference value of each first sample pair in the first sample pair set.
Continuing with the previous example, after the sample pair A is retained as the first sample pair, the first instantaneous internal resistance of the sample pair A
Are respectively likeThe first instantaneous internal resistances of other first sample pairs in the charging process are calculated, so that the first instantaneous internal resistance of each first sample pair in the charging process is obtained.
And 2, determining a first internal resistance value of the battery to be tested in a single charging process in the specified time period according to the calculated first instantaneous internal resistance.
As a possible operation manner, calculating an average value of all the first instantaneous internal resistances according to all the calculated first instantaneous internal resistances; and determining the calculated average value as a first internal resistance value of the battery to be tested in a single charging process in the specified time period.
The average value may be an arithmetic average value, a weighted average value, a squared average value, or the like, and may be determined by itself according to the actual situation, which is not limited. Taking the above average value as an arithmetic average value as an example, the first internal resistance value of the battery to be tested in the primary charging process can be specifically calculated by adopting the following formula:
wherein, R represents the first internal resistance value of the battery to be tested in the charging process, RiRepresents the first instantaneous internal resistance of the ith first sample pair in the charging process, and n represents the number of the first sample pairs in the charging process.
The method for determining the internal resistance of the battery provided by the embodiment of the application comprises the following steps: the method comprises the steps of firstly obtaining an initial data sample set of a battery to be tested in a single charging process in a specified time period (each data sample in the initial data sample set at least comprises a charging time, an SOC value, a current value and a voltage value), then carrying out data cleaning on the initial data sample set according to a preset rule to obtain a first sample pair set comprising a plurality of first sample pairs (each first sample pair is composed of two data samples adjacent to the charging time in the initial data sample set), and then determining a first internal resistance value of the battery to be tested in the single charging process in the specified time period according to the first sample pair set. By adopting the technology, after battery parameter data samples in a charging process of the battery are obtained within a period of time, data cleaning is carried out on the data samples according to a specific rule, so that a plurality of sample pairs consisting of two adjacent data samples at the charging time are obtained, and finally the internal resistance value of the battery in the charging process within the period of time is determined according to the sample pairs.
In the practical application process, the battery to be tested can be suitable for a target vehicle, so that relevant personnel can identify the source of the data sample conveniently, and the data sample can also comprise the identity information of the target vehicle; the identity identification is a unique identification used for representing the identity of the target vehicle, and specifically can be a frame number, a license plate number and the like, and is not limited. Based on this, for the situation that the battery to be tested has performed a plurality of charging processes within the specified time period, the method may further include the following operation modes: acquiring a first internal resistance value of the battery to be tested in each charging process in the specified time period; and determining a second internal resistance value of the target vehicle in the specified time period according to the identity information and the acquired plurality of first internal resistance values.
As a possible implementation manner, the step of determining the second internal resistance value of the target vehicle in the specified time period according to the identity information and the obtained plurality of first internal resistance values may specifically adopt the following operation manners: determining a first internal resistance value of a battery to be tested corresponding to the target vehicle in each charging process within the specified time period according to the identity information of the target vehicle; calculating to obtain an average value of all the first internal resistance values according to all the determined first internal resistance values; the average value is similar to the average value mentioned in the foregoing, and details thereof are not repeated; and determining the calculated average value as a second internal resistance value of the battery to be tested in the specified time period. For example, an electric vehicle equipped with one battery pack performs three charging processes within seven days, calculates first internal resistance values of the electric vehicle in each charging process within seven days to obtain three first internal resistance values, calculates an arithmetic average value of the three first internal resistance values, and determines the arithmetic average value as a second internal resistance value of the electric vehicle within seven days.
In an actual application process, the target vehicle may be a vehicle belonging to a target vehicle type in the specified time period in a specified charging area; in order to facilitate the relevant personnel to identify the source of the data sample, the data sample may further include area information of the designated charging area and vehicle type information of the target vehicle type; the specific content of the area information may include, but is not limited to, a zip code, a city name, and the like of the designated charging area; the specific content of the vehicle type information may specifically include a vehicle type number, a manufacturer name, and the like, which is not limited. Based on this, for the case where there are a plurality of target vehicles within the specified charging region for the specified period of time, the method may further include the following operation: acquiring second internal resistance values of all target vehicles in the specified charging area; and determining a third internal resistance value of the target vehicle type in the specified charging region in the specified time period according to the region information, the vehicle type information and the obtained plurality of second internal resistance values.
As a possible implementation manner, the step of determining the third internal resistance value of the target vehicle type in the specified charging area in the specified time period according to the area information, the vehicle type information and the obtained plurality of second internal resistance values may specifically adopt the following operation manners: determining a second internal resistance value of each target vehicle in the specified charging area in the specified time period according to the area information and the vehicle type information of the target vehicle type; calculating an average value of the second internal resistance values according to all the determined second internal resistance values; the average value is similar to the average value mentioned in the foregoing, and details thereof are not repeated; and determining the calculated average value as a third internal resistance value of the target vehicle type in the specified charging area in the specified time period. For example, in order to know the third internal resistance value of a certain vehicle type in a certain city within seven days, the second internal resistance values of each electric vehicle belonging to the vehicle type in the city within seven days are respectively calculated to obtain a plurality of second internal resistance values, then the arithmetic mean value of the second internal resistance values is calculated, and the arithmetic mean value is determined as the third internal resistance value of the vehicle type in the city within seven days.
On the basis of the above determination method of the internal resistance of the battery, in order to further determine whether or not a second internal resistance value of a certain target vehicle in the specified time period is abnormal, the method may further include the following operation: calculating discrete degree parameters of all the obtained second internal resistance values; and judging whether the second internal resistance value of each target vehicle is abnormal or not according to the third internal resistance value and the discrete degree parameter.
The above-mentioned parameter of the degree of dispersion may be a standard deviation, a variance, or the like, and is not limited thereto. As a possible implementation manner, the standard deviation of all the acquired second internal resistance values is calculated, the standard deviation is multiplied by three and then added to the third internal resistance value to obtain an internal resistance threshold value, and if the second internal resistance value of a certain target vehicle in the specified charging region in the specified time period exceeds the internal resistance threshold value, it can be determined that the second internal resistance value of the target vehicle is abnormal. In practical applications, as a possible implementation manner, the internal resistance threshold may be defined according to a distribution of the second internal resistance values, for example, if the calculated second internal resistance values obey a normal distribution, the internal resistance threshold may be defined as a mean value of the normal distribution +3 × a standard deviation of the normal distribution, where the mean value of the normal distribution is the third internal resistance, and the standard deviation of the normal distribution is the standard deviation of all the acquired second internal resistance values.
Based on the foregoing method embodiment, an embodiment of the present application further provides an apparatus for determining internal resistance of a battery, as shown in fig. 2, where the apparatus includes:
the data acquisition module 21 is configured to acquire an initial data sample set of a battery to be tested in a single charging process within a specified time period; wherein the initial set of data samples comprises data samples for a plurality of different charging instants; wherein the data samples include at least a charging time, a SOC value, a current value, and a voltage value.
A data cleaning module 22, configured to perform data cleaning on the initial data sample set according to a preset rule, so as to obtain a first sample pair set including a plurality of first sample pairs; wherein each of the first sample pairs consists of two data samples adjacent in time of charging in the initial set of data samples.
And the first internal resistance value determining module 23 is configured to determine, according to the first sample pair set, a first internal resistance value of the battery to be tested in a single charging process in the specified time period.
The device for determining the internal resistance of the battery provided by the embodiment of the application can perform data cleaning on the data samples according to a specific rule after acquiring the battery parameter data samples in the process of charging the battery once within a period of time, thus obtaining a plurality of sample pairs consisting of two data samples adjacent to each other at the charging time, finally determining the internal resistance value of the battery in one charging process in the period of time according to the sample pairs, the operation mode can obtain the internal resistance of the battery in a period of time by simply processing the charging data of the battery in the period of time, compared with the mode of directly measuring the internal resistance of the battery through external equipment, the operation mode can reduce the cost required by determining the internal resistance of the battery, and the operation mode fully considers the real-time change of the battery parameters in the charging process when determining the internal resistance of the battery, thereby improving the accuracy of the determination result of the internal resistance of the battery.
The data cleansing module 22 is further configured to: forming a first initial sample pair by two adjacent data samples at the charging time in the initial data sample set to obtain a first initial sample pair set containing a plurality of first initial sample pairs; calculating the charging time interval, the current difference value and the voltage difference value of each first initial sample pair according to the charging time, the current value and the voltage value of the two data samples in each first initial sample pair; and taking the first initial sample pair meeting a first preset condition in the first initial sample pair set as the first sample pair to obtain a first sample pair set.
The first internal resistance value determining module 23 is further configured to: calculating to obtain a first instantaneous internal resistance of each first sample pair according to the voltage difference value and the current difference value of each first sample pair in the first sample pair set; and determining a first internal resistance value of the battery to be tested in a single charging process in the specified time period according to all the calculated first instant internal resistances.
The first internal resistance value determining module 23 is further configured to: calculating to obtain an average value of all the first instantaneous internal resistances according to all the calculated first instantaneous internal resistances; and determining the calculated average value as a first internal resistance value of the battery to be tested in a single charging process in the specified time period.
The battery to be tested is suitable for the target vehicle; the data sample further includes identity information of the target vehicle; the battery to be tested is charged for a plurality of times within a specified time period; based on this, on the basis of the determination apparatus for internal resistance of battery shown in fig. 2, the embodiment of the present application further provides another determination apparatus for internal resistance of battery, referring to fig. 3, the apparatus further includes:
and the first internal resistance value obtaining module 24 is configured to obtain a first internal resistance value of the battery to be tested in each charging process in the specified time period.
And a second internal resistance value determining module 25, configured to determine a second internal resistance value of the target vehicle in the specified time period according to the identity information and the obtained multiple first internal resistance values.
The target vehicle is a vehicle belonging to a target vehicle type in a specified time period in a specified charging area; a plurality of target vehicles are arranged in the designated charging area; the data sample further comprises area information of the designated charging area and vehicle type information of the target vehicle type; based on this, on the basis of the determination apparatus for internal resistance of battery shown in fig. 3, the embodiment of the present application further provides another determination apparatus for internal resistance of battery, referring to fig. 4, the apparatus further includes:
and a second internal resistance value obtaining module 26, configured to obtain second internal resistance values of all target vehicles in the specified charging area.
And a third internal resistance value determining module 27, configured to determine a third internal resistance value of the target vehicle type in the specified charging area in the specified time period according to the area information, the vehicle type information, and the obtained multiple second internal resistance values.
An abnormality determining module 28, configured to calculate discrete degree parameters of all the obtained second internal resistance values; and judging whether the second internal resistance value of each target vehicle is abnormal or not according to the third internal resistance value and the discrete degree parameter.
The implementation principle and the technical effects of the device for determining the internal resistance of the battery provided by the embodiment of the present application are the same as those of the embodiment of the method described above, and for the sake of brief description, no mention is made in the embodiment of the device, and reference may be made to the corresponding contents in the embodiment of the method described above.
An electronic device is further provided in the embodiment of the present application, as shown in fig. 5, which is a schematic structural diagram of the electronic device, where the electronic device includes a processor 51 and a memory 50, the memory 50 stores computer-executable instructions capable of being executed by the processor 51, and the processor 51 executes the computer-executable instructions to implement the method for determining the internal resistance of the battery.
In the embodiment shown in fig. 5, the electronic device further comprises a bus 52 and a communication interface 53, wherein the processor 51, the communication interface 53 and the memory 50 are connected by the bus 52.
The Memory 50 may include a high-speed Random Access Memory (RAM) and may also include a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The communication connection between the network element of the system and at least one other network element is realized through at least one communication interface 53 (which may be wired or wireless), and the internet, a wide area network, a local network, a metropolitan area network, and the like can be used. The bus 52 may be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, an EISA (Extended Industry Standard Architecture) bus, or the like. The bus 52 may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one double-headed arrow is shown in FIG. 5, but this does not indicate only one bus or one type of bus.
The processor 51 may be an integrated circuit chip having signal processing capabilities. In implementation, the steps of the method for determining the internal resistance of the battery may be implemented by an integrated logic circuit of hardware in the processor 51 or instructions in the form of software. The Processor 51 may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other Programmable logic device, a discrete Gate or transistor logic device, or a discrete hardware component. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like. The steps of the method for determining the internal resistance of the battery disclosed in the embodiment of the present application may be directly implemented by a hardware decoding processor, or implemented by a combination of hardware and software modules in the decoding processor. The software module may be located in ram, flash memory, rom, prom, or eprom, registers, etc. storage media as is well known in the art. The storage medium is located in the memory 50, and the processor 51 reads the information in the memory 50, and completes the steps of the determination method of the battery internal resistance of the foregoing embodiment in combination with the hardware thereof.
The embodiment of the present application further provides a computer-readable storage medium, where the computer-readable storage medium stores computer-executable instructions, and when the computer-executable instructions are called and executed by a processor, the computer-executable instructions cause the processor to implement the method for determining the internal resistance of the battery, and specific implementation may refer to the foregoing method embodiment, and details are not described herein again.
The method and the apparatus for determining the internal resistance of the battery and the computer program product of the electronic device provided in the embodiments of the present application include a computer-readable storage medium storing a program code, where instructions included in the program code may be used to execute the method for determining the internal resistance of the battery described in the foregoing method embodiments, and specific implementations may refer to the method embodiments and are not described herein again.
Unless specifically stated otherwise, the relative steps, numerical expressions, and values of the components and steps set forth in these embodiments do not limit the scope of the present application.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the exemplary embodiments of the present application, and are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A method for determining internal resistance of a battery, the method comprising:
acquiring an initial data sample set of a battery to be tested in a single charging process within a specified time period; wherein each data sample in the initial set of data samples comprises at least a charging time, a SOC value, a current value, and a voltage value;
performing data cleaning on the initial data sample set according to a preset rule to obtain a first sample pair set comprising a plurality of first sample pairs; wherein each of the first sample pairs consists of two data samples adjacent to each other at a charging time in the initial data sample set;
and determining a first internal resistance value of the battery to be tested in a single charging process in the specified time period according to the first sample pair set.
2. The method for determining the internal resistance of the battery according to claim 1, wherein the step of performing data cleansing on the initial data sample set according to a preset rule to obtain a first sample pair set including a plurality of first sample pairs comprises:
forming a first initial sample pair by two adjacent data samples at the charging time in the initial data sample set to obtain a first initial sample pair set containing a plurality of first initial sample pairs;
calculating the charging time interval, the current difference value and the voltage difference value of each first initial sample pair according to the charging time, the current value and the voltage value of the two data samples in each first initial sample pair;
and taking the first initial sample pair meeting a first preset condition in the first initial sample pair set as the first sample pair to obtain a first sample pair set.
3. The method according to claim 2, wherein the satisfaction of the first preset condition includes at least one of: the charging time interval does not exceed a preset time threshold; the SOC values of two data samples in the same first initial sample pair are smaller than a preset SOC threshold value; the current value of the same first initial sample pair at the later charging moment is smaller than a preset current threshold value; the current difference value is within a preset current interval; the voltage difference value is within a preset voltage interval.
4. The method for determining the internal resistance of the battery according to claim 1, wherein the step of determining the first internal resistance value of the battery to be tested in a single charging process in the specified time period according to the first sample pair set comprises:
calculating to obtain a first instantaneous internal resistance of each first sample pair according to the voltage difference value and the current difference value of each first sample pair in the first sample pair set;
and determining a first internal resistance value of the battery to be tested in a single charging process in the specified time period according to all the calculated first instant internal resistances.
5. The method for determining the internal resistance of the battery according to claim 4, wherein the step of determining the first internal resistance value of the battery to be tested in a single charging process in the specified time period according to all the calculated first instantaneous internal resistances comprises:
calculating the average value of all the first instantaneous internal resistances according to all the calculated first instantaneous internal resistances;
and determining the calculated average value as a first internal resistance value of the battery to be tested in a single charging process in the specified time period.
6. The method for determining the internal resistance of a battery according to any one of claims 1 to 5, wherein the battery to be tested is adapted to a target vehicle; the data sample further includes identity information of the target vehicle; the battery to be tested is charged for multiple times within a specified time period; the method further comprises the following steps:
acquiring a first internal resistance value of the battery to be tested in each charging process in the specified time period;
and determining a second internal resistance value of the target vehicle in the specified time period according to the identity information and the acquired plurality of first internal resistance values.
7. The method of determining the internal resistance of the battery according to claim 6, wherein the target vehicle is a vehicle belonging to a target vehicle type within a specified charging region for the specified period of time; a plurality of the target vehicles within the designated charging area for the designated time period; the data sample further comprises area information of the specified charging area and vehicle type information of the target vehicle type; the method further comprises the following steps:
acquiring second internal resistance values of all target vehicles in the specified charging area;
and determining a third internal resistance value of the target vehicle type in the specified charging region in the specified time period according to the region information, the vehicle type information and the obtained plurality of second internal resistance values.
8. The method of determining the internal resistance of the battery according to claim 7, further comprising:
calculating discrete degree parameters of all the obtained second internal resistance values;
and judging whether the second internal resistance value of each target vehicle is abnormal or not according to the third internal resistance value and the discrete degree parameter.
9. An apparatus for determining an internal resistance of a battery, the apparatus comprising:
the data acquisition module is used for acquiring an initial data sample set of the battery to be detected in a single charging process within a specified time period; wherein the initial set of data samples comprises data samples for a plurality of different charging instants; wherein the data samples comprise at least a charging time, an SOC value, a current value, and a voltage value;
the data cleaning module is used for carrying out data cleaning on the initial data sample set according to a preset rule to obtain a first sample pair set containing a plurality of first sample pairs; wherein each of the first sample pairs consists of two data samples adjacent to each other at a charging time in the initial data sample set;
and the first internal resistance value determining module is used for determining a first internal resistance value of the battery to be tested in a single charging process in the specified time period according to the first sample pair set.
10. An electronic device comprising a processor and a memory, the memory storing computer-executable instructions executable by the processor, the processor executing the computer-executable instructions to implement the method of determining an internal resistance of a battery of any one of claims 1 to 8.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115144778A (en) * | 2022-09-02 | 2022-10-04 | 力高(山东)新能源技术有限公司 | Method for estimating internal resistance of battery by big data |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115144778A (en) * | 2022-09-02 | 2022-10-04 | 力高(山东)新能源技术有限公司 | Method for estimating internal resistance of battery by big data |
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