CN114325427A - Method and device for estimating residual capacity of storage battery and storage medium - Google Patents
Method and device for estimating residual capacity of storage battery and storage medium Download PDFInfo
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Abstract
The application relates to a method and a device for estimating the residual capacity of a storage battery and a storage medium. The estimation method of the residual capacity of the storage battery comprises the following steps: performing constant current discharge on the storage battery based on a preset physical model, and respectively acquiring a plurality of voltage values of the storage battery in the discharge process, wherein the voltage values are respectively in one-to-one correspondence with a plurality of discharge moments; acquiring the polarization resistance difference of the storage battery according to the physical model and the plurality of voltage values; and determining the residual capacity of the storage battery according to the polarization resistance difference and a preset mathematical regression model. The residual capacity of the storage battery can be estimated more accurately.
Description
Technical Field
The application relates to the technical field of storage battery detection, in particular to a storage battery detection device.
Background
The existing method for detecting the residual capacity of the storage battery comprises a terminal voltage method and an internal resistance method, but both the terminal voltage method and the internal resistance method have certain limitations.
The technical drawback of the terminal voltage method is that, in the static state of the storage battery, the terminal voltage of the storage battery appears a virtual voltage phenomenon, and particularly for different batches of storage batteries, the same terminal voltage level may correspond to different residual capacity levels, so that the terminal voltage method limits the application range of the related test equipment.
The technical defect of the resistance method is that whether the internal resistance is measured by a direct current method or an alternating current method, when the residual capacity of the storage battery is sufficient, the resolution of the internal resistance of the storage battery is not particularly obvious, and inaccuracy is brought to the estimation of the residual capacity. In addition, theoretically, a storage battery Thevenin circuit model needs to be identified by an alternating current multi-frequency point technology, but in actual engineering, multi-frequency point small signals are very easily interfered, the sensitivity is very high, the fluctuation of measured values is also very large, and the coupling of unstable measured values to other capacity estimation in the later period is very high. If the direct current method with better stability is used for measuring the internal resistance, the Thevenin circuit model cannot be identified, only the total impedance can be measured, and the residual capacity of the storage battery cannot be well estimated.
Disclosure of Invention
In view of the above, it is desirable to provide a method, an apparatus, and a storage medium for estimating a remaining capacity of a battery, which can estimate the remaining capacity of the battery more accurately.
A method for estimating the residual capacity of a storage battery comprises the following steps:
performing constant current discharge on the storage battery based on a preset physical model, and respectively acquiring a plurality of voltage values of the storage battery in the discharge process, wherein the voltage values are respectively in one-to-one correspondence with a plurality of discharge moments;
acquiring the polarization resistance difference of the storage battery according to the physical model and the plurality of voltage values;
and determining the residual capacity of the storage battery according to the polarization resistance difference and a preset mathematical regression model.
In one embodiment, before determining the residual capacity of the storage battery according to the polarization resistance difference and a preset mathematical regression model, the method further comprises the following steps:
respectively acquiring a plurality of polarization resistance differences and a plurality of residual capacities in one-to-one correspondence;
and constructing a mathematical regression model according to the plurality of polarization resistance differences and the plurality of residual capacities.
In one embodiment, the obtaining a plurality of polarization resistance differences and a plurality of residual capacities in one-to-one correspondence includes:
determining a plurality of sampling capacity points, wherein the plurality of sampling capacity points are respectively in one-to-one correspondence with the plurality of residual capacities;
and performing constant current discharge on the storage battery based on a preset physical model, and respectively acquiring the polarization resistance difference of the storage battery at each sampling capacity point.
In one embodiment, determining a plurality of sample capacity points comprises:
acquiring the initial capacity of the storage battery;
and determining a plurality of sampling capacity points according to the initial capacity, wherein the residual capacity percentage corresponding to each sampling capacity point is equidistantly arranged, and the residual capacity percentage is the ratio of the residual capacity to the initial capacity.
In one embodiment, the constant current discharging of the storage battery based on the preset physical model and the obtaining of a plurality of voltage values of the storage battery during the discharging process respectively comprise:
acquiring a terminal voltage curve of a constant current discharging process of the storage battery based on a preset physical model;
determining a first maximum value point, a minimum value point and a second maximum value point which sequentially appear on the end voltage curve, wherein a plurality of voltage values of the storage battery in the discharging process comprise an initial voltage value corresponding to the first maximum value, an instantaneous drop voltage value corresponding to the minimum value and a back-rise voltage value corresponding to the second maximum value;
respectively acquiring a plurality of voltage values of the storage battery in a discharging process, wherein the method comprises the following steps:
and respectively acquiring an initial voltage value, an instantaneous drop voltage value and a back-rise voltage value of the storage battery in the discharging process.
In one embodiment, obtaining the polarization resistance difference of the storage battery according to the physical model and the plurality of voltage values comprises:
respectively constructing a first circuit equation of the storage battery at an instantaneous drop moment and a second circuit equation of the storage battery at a rising moment according to the physical model and the voltage values, wherein the instantaneous drop moment is a moment corresponding to the minimum value point, and the rising moment is a moment corresponding to the second maximum value point;
and acquiring a polarization resistance difference according to the first circuit equation and the second circuit equation.
In one embodiment, the preset physical model includes an ohmic resistance, a polarization resistance and an electrodynamic property of the storage battery, and the first circuit equation is as follows:
U0＝E
I*R1+I*R2T1+UT1＝E
the second circuit equation is:
I*R1+I*R2T2+UT2＝E
wherein E is electromotive force of the storage battery, U0 is initial voltage value, R1 is ohmic resistor, R2T1Is a first polarization resistance value, U, corresponding to the instant drop timeT1For the instantaneous drop voltage value, I is the current flowing through the ohmic resistor R1, R2T2A second value of the polarization resistance, U, corresponding to the time point for the buck valueT2Is the voltage value of the back rise, I is the current;
obtaining a polarization resistance difference according to a first circuit equation and a second circuit equation, comprising:
and acquiring a difference value between the first polarization resistance value and the second polarization resistance value, and taking the difference value as a polarization resistance difference.
An estimation device of a remaining capacity of a storage battery, comprising:
the voltage value acquisition module is used for carrying out constant current discharge on the storage battery based on a preset physical model and respectively acquiring a plurality of voltage values of the storage battery in the discharge process, wherein the plurality of voltage values are in one-to-one correspondence with a plurality of discharge moments;
the polarization resistance difference acquisition module is used for acquiring the polarization resistance difference of the storage battery according to the physical model and the plurality of voltage values;
and the residual capacity pre-estimating module is used for determining the residual capacity of the storage battery according to the polarization resistance difference and a preset mathematical regression model.
A computer device comprising a memory storing a computer program and a processor implementing the steps of the method when the processor executes the computer program.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
The estimation method for the residual capacity of the storage battery comprises the following steps: performing constant current discharge on the storage battery based on a preset physical model, and respectively acquiring a plurality of voltage values of the storage battery in the discharge process, wherein the voltage values are respectively in one-to-one correspondence with a plurality of discharge moments; acquiring the polarization resistance difference of the storage battery according to the physical model and the plurality of voltage values; and determining the residual capacity of the storage battery according to the polarization resistance difference and a preset mathematical regression model. The method is characterized in that constant current discharge is carried out on the storage battery based on a preset physical model, the voltage hysteresis effect of the terminal voltage of the storage battery can occur in the initial discharge stage, the time of the voltage hysteresis effect is relatively short, the ohmic internal resistance of the storage battery and the electromotive force of the storage battery are considered to be stable and unchangeable in the voltage hysteresis effect time, and the polarization resistance of the storage battery is considered to be variable, so that the situation that the terminal voltage hysteresis phenomenon is caused by the polarization internal resistance based on the storage battery Thevenin circuit model is explained, and a corresponding relation with the residual electric quantity of the storage battery is established by the difference value between the polarization internal resistance at the time of a valley bottom of voltage and the polarization internal resistance at the time of a hysteresis peak point, so that the residual capacity of the storage battery is judged. The method avoids the problem of virtual voltage when the terminal voltage of an aged storage battery is static in the estimation of the residual capacity of the storage battery, and the problem of low resolution of ohmic resistance in a Thevenin circuit model of the storage battery at the stage of more residual capacity of the storage battery, and simultaneously avoids the sensitive and unstable problem of directly measuring the polarization internal resistance in the Thevenin circuit model of the storage battery at multiple frequency points, so that the estimation of the initial residual capacity of the storage battery is more accurate.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or the conventional technologies of the present application, the drawings used in the descriptions of the embodiments or the conventional technologies will be briefly introduced below, it is obvious that the drawings in the following descriptions are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a method for estimating remaining capacity of a battery according to an embodiment;
FIG. 2 is a schematic diagram of a circuit model of a battery Thevenin according to an embodiment;
FIG. 3 is a second flowchart illustrating a method for estimating remaining capacity of a battery according to an embodiment;
FIG. 4 is a third schematic flow chart illustrating a method for estimating remaining capacity of a battery according to an embodiment;
FIG. 5 is a fourth schematic flowchart illustrating a method for estimating remaining capacity of a battery according to an embodiment;
FIG. 6 is a fifth flowchart illustrating a method for estimating remaining battery capacity according to an embodiment;
FIG. 7 is a plot of battery voltage hysteresis for one embodiment;
fig. 8 is a schematic structural diagram of an estimation device of the remaining capacity of the storage battery in one embodiment.
Detailed Description
To facilitate an understanding of the present application, the present application will now be described more fully with reference to the accompanying drawings. Embodiments of the present application are set forth in the accompanying drawings. This application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be understood that, as used herein, the terms "first," "second," and the like may be used herein to describe various elements, but these elements are not limited by these terms. These terms are only used to distinguish one element from another.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or be connected to the other element through intervening elements. Further, "connection" in the following embodiments is understood to mean "electrical connection", "communication connection", or the like, if there is a transfer of electrical signals or data between the connected objects.
As used herein, the singular forms "a", "an" and "the" may include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises/comprising," "includes" or "including," etc., specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof.
In the description herein, references to the description of "some embodiments," "other embodiments," "desired embodiments," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, a schematic description of the above terminology may not necessarily refer to the same embodiment or example.
In one embodiment, as shown in fig. 1, a method for estimating the remaining capacity of a battery is provided, and the method includes steps S100 to S300.
And S100, performing constant current discharge on the storage battery based on a preset physical model, and respectively acquiring a plurality of voltage values of the storage battery in the discharge process, wherein the voltage values are respectively in one-to-one correspondence with a plurality of discharge moments.
Specifically, the preset physical model is a Thevenin circuit model, which is referred to as the Thevenin circuit model provided in fig. 2, wherein E is an electromotive force of the secondary battery, R1 is an ohmic resistor, C2 is a polarization capacitor, R2 is an internal polarization resistor, and U0 is a terminal voltage. In this embodiment, based on a Thevenin circuit model of the storage battery, the voltage hysteresis effect of the terminal voltage of the storage battery may occur during the initial period of the storage battery through a certain direct current constant current discharge. The voltage hysteresis refers to that the voltage is instantaneously reduced to a lowest voltage from an initial voltage in a relatively short time, and then is increased back to a high voltage in a short time. Since the voltage hysteresis effect is short in total, the electromotive force of the ohmic resistance included in the battery Thevenin circuit model can be considered to be stable and constant during this period. Further, a voltage hysteresis phenomenon due to polarization internal resistance can be obtained.
And step S200, acquiring the polarization resistance difference of the storage battery according to the physical model and the plurality of voltage values.
Specifically, the plurality of voltage values are a plurality of voltage values corresponding to each other at a plurality of times in the voltage hysteresis process, and according to the characteristics of the Thevenin circuit model and the obtained plurality of voltage values in the voltage hysteresis process, the polarization resistance difference in the voltage hysteresis process can be obtained in this embodiment.
And step S300, determining the residual capacity of the storage battery according to the polarization resistance difference and a preset mathematical regression model.
Specifically, the preset mathematical regression model includes the relationship between the difference in polarization resistance and the remaining capacity of the storage battery, and therefore, the remaining capacity of the storage battery can be determined from the difference in polarization resistance and the preset mathematical regression model in the present embodiment.
In the above embodiment, based on the preset physical model of the storage battery, a plurality of voltage values in a voltage hysteresis phenomenon of the storage battery in a short time during the constant current discharge process are obtained, so as to obtain the polarization resistance difference of the storage battery, and the prepared residual capacity of the storage battery is obtained by comparing the polarization resistance difference of the storage battery with the preset mathematical regression model. The method avoids the problems of virtual voltage, insufficient resolution and sensitivity and instability of polarized internal resistance of a multi-frequency point direct measurement polarized internal resistance method in a terminal voltage method.
Meanwhile, the constant current discharge current of the embodiment is the actual constant current under the actual working condition of the storage battery, and does not need to generate specific current or stop discharging, so the method can be used in an actual running online monitoring system, for example, a direct current motor is used after being started, or the method can be used in independent test equipment in a laboratory or a handheld storage battery test instrument when the storage battery is discharged, and can be preferentially used on a lead-acid storage battery.
In one embodiment, as shown in fig. 3, a method for estimating the remaining capacity of a battery is provided, where S300 of the method further includes step S400 and step S500.
Step S400, a plurality of polarization resistance differences and a plurality of residual capacities are respectively obtained in one-to-one correspondence.
Step S500, a mathematical regression model is constructed according to the polarization resistance differences and the residual capacities.
Specifically, a mathematical regression model is established by establishing a one-to-one correspondence relationship between residual capacity and polarization resistance difference and by a curve regression fitting method:
SOC＝f(ΔR2)
where SOC is the remaining capacity and Δ R2 is the polarization resistance difference.
In the implementation, by establishing the mathematical regression model, when the polarization resistance difference of the voltage hysteresis process obtained by the constant current discharge method is obtained, the residual capacity corresponding to the storage battery can be effectively estimated and judged.
In one embodiment, as shown in fig. 4, a method for estimating the remaining capacity of a battery is provided, and step S400 of the method includes step S410 and step S420.
Step S410, a plurality of sampling capacity points are determined, and the plurality of sampling capacity points are respectively in one-to-one correspondence with the plurality of remaining capacities.
Specifically, the plurality of residual capacities may be set at equal distances or may not be set at equal distances, and a sampling capacity point is marked for each set residual capacity. It can be understood that, in the practical application process, if the method is applied to the factory test of the storage battery, the remaining capacity of most storage batteries is in a higher range, so that when a plurality of remaining capacities are determined, a plurality of sampling capacity points with higher remaining capacities may be set relatively, and a plurality of sampling capacity points with lower remaining capacities may be set relatively, that is, a plurality of remaining capacities may not be set equidistantly.
And step S420, performing constant current discharge on the storage battery based on a preset physical model, and respectively obtaining the polarization resistance difference of the storage battery at each sampling capacity point.
Specifically, the steps obtain a plurality of storage batteries with residual capacity, the storage batteries are subjected to constant current discharge based on a preset physical model, and the polarization resistance difference in the voltage hysteresis process at different sampling capacity points is obtained.
In one embodiment, as shown in fig. 5, a method for estimating the remaining capacity of a battery is provided, wherein in step S410, the step S4101 and the step S4102 are included for determining a plurality of sampling capacity points.
In step S4101, the initial capacity of the battery is acquired.
In this embodiment, in order to reasonably and accurately establish a mathematical regression model of the relationship between the difference in polarization resistance and the remaining capacity of the battery, the actual capacity of the battery selected for detection is at least 0.95 times or more the nominal capacity of the battery.
Here, the initial capacity refers to a charge capacity of the battery after actually being fully charged. In the present embodiment, the specific method for obtaining the initial capacity of the storage battery is to discharge the fully charged storage battery to the total capacity when the storage battery is discharged to the cut-off voltage at a constant current of 10 hours, for example, the total discharge amount in 10 hours is 20A, which indicates that the actual fully charged capacity of the storage battery is 20 ampere hours, wherein in case of a 2V storage battery, the cut-off voltage is 1.8V. Specifically, the standard for fully charging the secondary battery is that the terminal voltage of the secondary battery rises to the maximum value and the voltage is not increased within 3 hours; secondly, the electrolyte rises to the maximum value and does not rise any more within 3 hours; finally, a large amount of bubbles are vigorously discharged from the interior of the storage battery, and a boiling phenomenon is formed.
Step S4102, determining a plurality of sampling capacity points according to the initial capacity, wherein the residual capacity percentage corresponding to each sampling capacity point is equidistantly arranged, and the residual capacity percentage is the ratio of the residual capacity to the initial capacity.
Specifically, the storage battery is subjected to constant current discharge at sampling capacity points corresponding to each residual capacity percentage at intervals with n% as residual capacity from full charge, and polarization resistance difference in the hysteresis voltage process is obtained. For example, n is 5, that is, the remaining capacity is 5% at intervals, from 100%, 95%, and so on, until the remaining capacity of the battery becomes 0%. The sampling capacity point corresponding to each residual capacity can be obtained by a current constant-current discharge ampere-hour method at a rate of 10 hours, and after the required residual capacity is discharged each time, the storage battery is kept still for 30 minutes to 1 hour, and then the polarization resistance difference collection of the next constant-current discharge is carried out, so that accurate data can be obtained.
According to the embodiment, the sampling capacity points corresponding to the residual capacity of the storage battery are reasonably set through the storage battery, the accurate mathematical regression model is obtained, and meanwhile the efficiency of establishing the required mathematical regression model is improved.
In one embodiment, as shown in fig. 6, a method for estimating the remaining capacity of a storage battery is provided, wherein step S100 includes step S110, step S120 and step S130.
And step S110, acquiring a terminal voltage curve of the constant current discharging process of the storage battery based on a preset physical model.
Specifically, referring to the voltage hysteresis curve provided in fig. 7, the abscissa represents the constant current discharge time and the ordinate represents the terminal voltage.
And step S120, determining a first maximum value point, a minimum value point and a second maximum value point which sequentially appear on the end voltage curve, wherein a plurality of voltage values of the storage battery in the discharging process comprise an initial voltage value corresponding to the first maximum value point, an instantaneous drop voltage value corresponding to the minimum value point and a back-rise voltage value corresponding to the second maximum value point.
Specifically, based on the battery Thevenin circuit model provided in this embodiment, the battery is dc discharged at a constant current intensity, the constant current signal is an excitation characteristic quantity, and according to the RC circuit characteristics, the state characteristic quantities of the battery Thevenin model participating in the dc discharge response mainly include the ohmic internal resistance and the polarization internal resistance, and the terminal voltage is a response characteristic quantity.
Specifically, referring to fig. 7, the dc constant current discharge hysteresis voltage process is characterized in that the process consists of a time period i and a time period ii, and the time period i of the dc constant current discharge hysteresis voltage process is characterized in that, in the time period i, the terminal voltage in the battery Thevenin circuit model is instantly decreased from an initial value U0 at the time T0 to UT1 at the time T1; in the period II, the terminal voltage in the storage battery Thevenin circuit model is increased from UT1 at the time of T1 back to UT2 at the time of T2; in the process of direct-current constant-current discharge hysteresis voltage, the size relationship of U0, UT1 and UT2 is U0 > UT2 > UT 1. In addition, as mentioned above, a low voltage with a low voltage value and two initial voltages and a back-up voltage with a high voltage value appear in the whole voltage hysteresis process. In fig. 7, the first maximum point corresponding to the time T0 is the initial voltage, the minimum point corresponding to the time T1 is the instantaneous drop voltage, and the second maximum point corresponding to the time T2 is the ramp-up voltage.
And step S130, respectively acquiring an initial voltage value, an instantaneous drop voltage value and a back-rise voltage value of the storage battery in the discharging process.
Specifically, in the embodiment, a sampling channel of the terminal voltage and the current of the storage battery is opened through a sampler, sampling is started, constant current I discharge is started, when a current value first current value I (k) is sampled at the moment k and is greater than 0A, the voltage U (k) of the sampling point is marked, and when the voltage U (k) is less than or equal to the voltage U (k-1) at the moment k-1 of the previous sampling point, the initial voltage value U0 of the storage battery is obtained as U (k-1); meanwhile, when the voltage value U (j-1) > U (j) sampled at the moment j +1 and U (j) < U (j +1), acquiring the instantaneous drop voltage value UT1 ═ U (j) of the storage battery, and T1 ═ j; further, when the voltage value U (i-1) < U (i) sampled at the time point i +1 and U (i) ≧ U (i +1), the boost voltage value UT2 ═ U (i) and T2 ═ i of the storage battery are obtained.
In one embodiment, with continued reference to FIG. 5, step S200 of the method includes step S210 and step S220.
And step S210, respectively constructing a first circuit equation of the storage battery at the instantaneous drop moment and a second circuit equation of the storage battery at the rising moment according to the physical model and the voltage values, wherein the instantaneous drop moment is the moment corresponding to the minimum value point, and the rising moment is the moment corresponding to the second maximum value point.
Specifically, with continued reference to FIG. 7, the momentary descent time is T1 and the rebound time is T2. In the embodiment, a storage battery circuit equation at the time T1 in the period I in FIG. 7 is established as a first circuit equation; the battery circuit equation is established as the second circuit equation at time T2 of period ii in fig. 7.
Step S220, obtaining a polarization resistance difference according to the first circuit equation and the second circuit equation.
In one embodiment, the preset physical model includes an ohmic resistance, a polarization resistance and an electrodynamic property of the storage battery, and the first circuit equation is as follows:
U0＝E
I*R1+I*R2T1+UT1＝E
the second circuit equation is:
I*R1+I*R2T2+UT2＝E
wherein E is electromotive force of the storage battery, U0 is initial voltage value, R1 is ohmic resistor, R2T1Is a first polarization resistance value, U, corresponding to the instant drop timeT1For the instantaneous drop voltage value, I is the current flowing through the ohmic resistor R1, R2T2A second value of the polarization resistance, U, corresponding to the time point for the buck valueT2For the back-up voltage value, I is the current.
Wherein, step S220 further includes: and acquiring a difference value between the first polarization resistance value and the second polarization resistance value, and taking the difference value as a polarization resistance difference.
Specifically, the polarization resistance difference can be obtained by using the first circuit equation and the second circuit equation:
in this embodiment, by combining the first circuit equation and the second circuit equation, the accurate polarization resistance difference may be obtained by obtaining a difference between an instantaneous drop resistance value corresponding to the time T1 and a back-rise voltage value corresponding to the time T2, and obtaining a passing constant current, so that the detection process is greatly simplified.
It should be understood that although the steps in the flowcharts of fig. 1, 3-6 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and described, and may be performed in other orders, unless explicitly stated otherwise. Moreover, at least some of the steps in fig. 1, 3-6 may include multiple steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, which are not necessarily performed in sequence, but may be performed alternately or at least partially with other steps or with at least some of the other steps.
In one embodiment, as shown in fig. 8, an estimation apparatus 100 of a remaining capacity of a storage battery is provided, and the estimation apparatus 100 of the remaining capacity of the storage battery includes a voltage value obtaining module 110, a polarization resistance difference obtaining module 120, and a remaining capacity estimation module 130. The voltage value obtaining module 110 is configured to perform constant current discharge on the storage battery based on a preset physical model, and obtain a plurality of voltage values of the storage battery in a discharge process, where the plurality of voltage values correspond to a plurality of discharge moments one to one; the polarization resistance difference obtaining module 120 is configured to obtain polarization resistance differences of the storage battery according to the physical model and the plurality of voltage values; the residual capacity estimation module 130 is configured to determine the residual capacity of the storage battery according to the polarization resistance difference and a preset mathematical regression model.
For the specific limitation of the estimation device of the remaining capacity of the storage battery, reference may be made to the above limitation of the estimation method of the remaining capacity of the storage battery, and details are not described herein again. All or part of the modules in the device for estimating the residual capacity of the storage battery can be realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules. It should be noted that, in the embodiment of the present application, the division of the module is schematic, and is only one logic function division, and there may be another division manner in actual implementation.
In one embodiment, a computer device is provided, which includes a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the estimation method of the residual capacity of the storage battery when executing the computer program.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the above-mentioned method for estimating a remaining capacity of a storage battery.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The method for estimating the residual capacity of the storage battery is characterized by comprising the following steps:
the method comprises the steps that constant current discharging is conducted on a storage battery on the basis of a preset physical model, a plurality of voltage values of the storage battery in the discharging process are obtained respectively, and the voltage values correspond to discharging moments one by one;
acquiring a polarization resistance difference of the storage battery according to the physical model and the voltage values;
and determining the residual capacity of the storage battery according to the polarization resistance difference and a preset mathematical regression model.
2. The method of claim 1, further comprising, prior to determining the remaining capacity of the battery based on the difference in polarization resistance and a predetermined mathematical regression model:
respectively acquiring a plurality of polarization resistance differences and a plurality of residual capacities in one-to-one correspondence;
and constructing the mathematical regression model according to the polarization resistance differences and the residual capacities.
3. The method according to claim 2, wherein the obtaining a plurality of polarization resistance differences and a plurality of residual capacities in one-to-one correspondence respectively comprises:
determining a plurality of sampling capacity points, wherein the sampling capacity points are respectively in one-to-one correspondence with the residual capacities;
and performing constant current discharge on the storage battery based on a preset physical model, and respectively acquiring the polarization resistance difference of the storage battery at each sampling capacity point.
4. The method of claim 2, wherein determining the plurality of sample capacity points comprises:
acquiring the initial capacity of the storage battery;
determining a plurality of sampling capacity points according to the initial capacity, wherein the residual capacity percentage corresponding to each sampling capacity point is equidistantly arranged, and the residual capacity percentage is the ratio of the residual capacity to the initial capacity.
5. The method according to claim 1, wherein the constant-current discharging the storage battery based on the preset physical model and respectively acquiring a plurality of voltage values of the storage battery in a discharging process comprises:
acquiring a terminal voltage curve of a constant current discharging process of the storage battery based on a preset physical model;
determining a first maximum value point, a minimum value point and a second maximum value point which sequentially appear on the end voltage curve, wherein a plurality of voltage values of the storage battery in the discharging process comprise an initial voltage value corresponding to the first maximum value, an instantaneous drop voltage value corresponding to the minimum value and a back-rise voltage value corresponding to the second maximum value;
the respectively acquiring a plurality of voltage values of the storage battery in a discharging process comprises:
and respectively acquiring an initial voltage value, an instantaneous drop voltage value and a back-rise voltage value of the storage battery in the discharging process.
6. The method of claim 5, wherein said obtaining a polarization resistance difference of said battery from said physical model and said plurality of voltage values comprises:
respectively constructing a first circuit equation of the storage battery at an instantaneous drop moment and a second circuit equation of the storage battery at a rising moment according to the physical model and the voltage values, wherein the instantaneous drop moment is a moment corresponding to the instantaneous drop voltage value point, and the rising moment is a moment corresponding to the rising voltage value point;
and acquiring a polarization resistance difference according to the first circuit equation and the second circuit equation.
7. The method of claim 5, wherein the preset physical model comprises an ohmic resistance, a polarization resistance and an electrodynamic property of the battery, and the first circuit equation is:
U0＝E
I*R1+I*R2T1+UT1＝E
the second circuit equation is:
I*R1+I*R2T2+UT2＝E
wherein E is the electromotive force of the battery, U0At an initial voltage value, R1 is the ohmic resistance, R2T1A first polarization resistance value, U, corresponding to the instant drop timeT1For the instantaneous drop voltage value, I is the current flowing through the ohmic resistor R1, R2T2A second polarization resistance value, U, corresponding to the time point of the buck voltage valueT2Is the said voltage value of rising back, I is the current;
the obtaining a polarization resistance difference according to the first circuit equation and the second circuit equation includes:
and acquiring a difference value between the first polarization resistance value and the second polarization resistance value, and taking the difference value as the polarization resistance difference.
8. An estimation device of a remaining capacity of a storage battery, comprising:
the device comprises a voltage value acquisition module, a storage battery charging module and a charging module, wherein the voltage value acquisition module is used for carrying out constant current discharging on the storage battery based on a preset physical model and respectively acquiring a plurality of voltage values of the storage battery in a discharging process, and the plurality of voltage values are respectively in one-to-one correspondence with a plurality of discharging moments;
the polarization resistance difference obtaining module is used for obtaining the polarization resistance difference of the storage battery according to the physical model and the voltage values;
and the residual capacity pre-estimating module is used for determining the residual capacity of the storage battery according to the polarization resistance difference and a preset mathematical regression model.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor, when executing the computer program, implements the steps of the method of any of claims 1 to 7.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, carries out the steps of the method of any one of claims 1 to 7.
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