CN115407202A - Device and method for determining degradation failure inflection point of storage battery - Google Patents
Device and method for determining degradation failure inflection point of storage battery Download PDFInfo
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- CN115407202A CN115407202A CN202210623796.0A CN202210623796A CN115407202A CN 115407202 A CN115407202 A CN 115407202A CN 202210623796 A CN202210623796 A CN 202210623796A CN 115407202 A CN115407202 A CN 115407202A
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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]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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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
-
- 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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The invention discloses a device and a method for determining a storage battery degradation failure inflection point, wherein the method comprises the following steps: firstly, sending an instruction to a shallow discharge load control unit through a controller so that the shallow discharge load control unit controls the tested storage battery to discharge at a specified current value according to the instruction; then parameters of the tested storage battery in the discharging process are controlled by the shallow discharging load control unit and sent to the controller; and finally, fitting the ampere-hour integral and the discharge curve of the tested storage battery through the controller according to the parameters to obtain a fitting curve, and determining a degeneration failure inflection point based on the fitting curve, so that the degeneration failure inflection point of the storage battery is accurately determined, and the accuracy of fault pre-judgment of the storage battery is improved.
Description
Technical Field
The invention relates to the technical field of storage batteries, in particular to a device and a method for determining a degradation failure inflection point of a storage battery.
Background
In modern society, the application of battery is more and more extensive, and its effect is also more and more important, and the battery is for after the battery discharges, can store the electric energy into chemical energy with the mode of charging, need discharge the battery that converts chemical energy into the electric energy again, and when the battery became invalid, its equipment of connecting can not normally work because of the power supply is not enough, and modern application environment is to the chemical power performance requirement of lead acid battery for example constantly improving.
The degradation failure inflection point is an inflection point at which the performance of the storage battery is rapidly degraded from normal to failure, and is different from the aging inflection point of the normal life cycle, the storage battery is possibly caused by advanced degradation caused by factors such as maintenance, application, use environment and the like, and the situation that the storage battery cannot be supplied with power at any moment once the storage battery fails and is not monitored is caused.
The conventional monitoring method for the storage battery is generally an open-circuit voltage method, and the method is characterized in that the current electricity storage quantity of the storage battery is determined by measuring the open-circuit voltage of the fully charged storage battery by utilizing the linear relation between the open-circuit voltage and the charge state of the storage battery, when the ratio of the current electricity storage quantity of the storage battery to the standard electricity storage quantity of the storage battery is less than 80%, the storage battery is judged to be out of service, but the open-circuit voltage of the storage battery cannot be measured in any working scene, only the terminal voltage can be measured, and the traditional method cannot accurately judge the degradation failure inflection point of the storage battery and carry out fault prediction because the linear relation does not exist between the terminal voltage and the charge state.
Therefore, how to accurately determine the degradation failure inflection point of the storage battery so as to perform fault prediction on the storage battery is a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
To achieve the above object, a first aspect of the present invention provides a device for determining a degradation failure inflection point of a storage battery, the device including:
the shallow discharge load control unit is connected with the controller and the tested storage battery, and is used for receiving an instruction of the controller, controlling the tested storage battery to discharge at a specified current value according to the instruction, and simultaneously collecting parameters of the tested storage battery in a discharge process and sending the parameters to the controller;
the controller configured to:
sending an instruction to the shallow discharge load control unit;
receiving parameters sent by the shallow discharge load control unit;
and fitting the ampere-hour integral and the discharge curve of the tested storage battery based on the parameters to obtain a fitting curve, and determining a degeneration failure inflection point based on the fitting curve.
Further, the shallow discharge load control unit includes:
the discharging load driving interface is used for receiving the instruction and controlling a discharging load array according to the instruction so as to discharge the tested storage battery with the specified current value;
and the discharge load array is a resistor sequence controlled by the discharge load driving interface.
Further, the discharge load array comprises a first control unit, a second control unit and a precision resistance control unit, the first control unit is connected with the second control unit, the precision resistance control unit comprises a unit resistance unit, a decimal resistance unit and a percentile resistance unit, and the unit resistance unit, the decimal resistance unit and the percentile resistance unit are connected in parallel.
Further, the parameters specifically include discharge time, terminal voltage of the battery to be tested, voltage difference between adjacent terminal voltage samples, and discharge current of the battery to be tested.
In a second aspect, an embodiment of the present invention further provides a method for determining a battery degradation failure inflection point, where the method is applied to the apparatus according to the first aspect, and the method includes:
sending an instruction to a shallow discharge load control unit through a controller so that the shallow discharge load control unit controls the tested storage battery to discharge at a specified current value according to the instruction;
parameters of the tested storage battery in the discharging process are controlled by the shallow discharging load control unit and sent to the controller;
and fitting the ampere-hour integral and the discharge curve of the tested storage battery through the controller according to the parameters to obtain a fitting curve, and determining a degeneration failure inflection point based on the fitting curve.
Further, the parameters specifically include discharge time, terminal voltage of the battery to be tested, voltage difference between voltage samples of adjacent terminals, and discharge current of the battery to be tested.
Further, fitting the ampere-hour integral and the discharge curve of the tested storage battery through the controller according to the parameters specifically comprises:
normalizing the discharge time, the terminal voltage sample time point and the terminal voltage sample in the parameters to obtain normalized data;
determining a voltage value under a discharge rate at a specified time by an interpolation method;
and fitting a discharge curve at the discharge rate of the specified time based on the normalized data and the voltage value at the discharge rate of the specified time to obtain a fitted curve of the voltage changing along with the time within the specified time.
Further, the determining a degradation failure inflection point based on the fitted curve specifically includes the following sub-steps:
s801, dividing the fitting curve according to first interval time;
s802, sequentially determining the division points of which the voltage difference values with the previous division point in all the division points divided according to the first interval time exceed a first threshold value according to the time sequence, and taking the division points as undetermined division points;
s803, determining the time point of the first undetermined division point according to the time sequence, and taking the time point as a reference time point;
s804, dividing the fitting curve behind the reference time point according to a second interval time, then judging whether the voltage difference value between a second division point and a first division point divided according to the second interval time exceeds a second threshold value, if so, executing S805, otherwise, taking the time point of the next to-be-divided point as the reference time point and continuing executing S804, wherein the flow is ended when all the time points of the to-be-divided point are taken as the reference time points and do not enter S805;
and S805, determining a time point of a second division point divided according to a second interval time, dividing a fitted curve after the time point according to a third interval time, and judging whether a voltage difference value between the second division point divided according to the third interval time and the first division point exceeds a third threshold value, if so, taking the time point of the second division point divided according to the third interval time as a degeneration failure inflection point, otherwise, taking the time point of the next to-be-determined division point as a reference time point and continuing to execute S804.
Compared with the prior art, the invention has the beneficial effects that:
the embodiment of the invention provides a device and a method for determining a degradation failure inflection point of a storage battery, wherein the method comprises the following steps: firstly, sending an instruction to a shallow discharge load control unit through a controller so that the shallow discharge load control unit controls the tested storage battery to discharge at a specified current value according to the instruction; then parameters of the tested storage battery in the discharging process are controlled by the shallow discharging load control unit and sent to the controller; and finally, fitting the ampere-hour integral and the discharge curve of the tested storage battery through the controller according to the parameters to obtain a fitting curve, and determining a degeneration failure inflection point based on the fitting curve, so that the degeneration failure inflection point of the storage battery is accurately determined, and the accuracy of fault pre-judgment of the storage battery is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts. In the drawings:
fig. 1 is a schematic structural view of a battery degradation failure inflection point determining device in a first embodiment of the present application;
fig. 2 is a schematic structural view of a discharge load array in a battery degradation failure inflection point determining device according to a first embodiment of the present application;
FIG. 3 is a schematic flow chart of a method for determining a battery degradation failure inflection point according to a second embodiment of the present application;
FIG. 4 is a diagram of a fitted curve in a second embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. All other embodiments obtained by a person skilled in the art based on the embodiments in the present specification without any inventive step should fall within the scope of protection of the present specification.
It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if," as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination," depending on the context.
A first embodiment of the present application proposes a battery degradation failure inflection point determining apparatus, as shown in fig. 1, including:
the shallow discharge load control unit is connected with the controller and the tested storage battery, and is used for receiving an instruction of the controller, controlling the tested storage battery to discharge at a specified current value according to the instruction, and simultaneously collecting parameters of the tested storage battery in a discharge process and sending the parameters to the controller;
the controller configured to:
sending an instruction to the shallow discharge load control unit;
receiving parameters sent by the shallow discharge load control unit;
and fitting the ampere-hour integral and the discharge curve of the tested storage battery based on the parameters to obtain a fitting curve, determining a degeneration failure inflection point based on the fitting curve, and determining the fitting curve and the degeneration failure inflection point in the same process as the second embodiment of the application.
The parameters specifically comprise discharge time, terminal voltage of the tested storage battery, voltage difference of adjacent terminal voltage samples and discharge current of the tested storage battery.
In an embodiment of the present application, the shallow discharge load control unit includes:
the discharging load driving interface is used for receiving the instruction and controlling a discharging load array according to the instruction so as to discharge the tested storage battery with the specified current value;
and the discharge load array is a resistor sequence controlled by the discharge load driving interface.
Specifically, as shown in fig. 1, the shallow discharge load control unit includes a discharge load driving interface and a discharge load array, where the discharge load array may be a single resistive load array, the single resistive load array is connected to the battery to be tested, that is, the battery to be tested in the drawing, or may be an N-step resistive load array, each discharge load array may manage a plurality of battery voltage segments, and in addition, if the battery to be tested is too large, a plurality of shallow discharge load control units may be set up to be connected to the battery to be tested.
The device comprises a light discharge load unit, a communication interface and a power supply, wherein the light discharge load unit controls a tested storage battery, namely a tested object storage battery in the graph to discharge with a specified current value after receiving an instruction of a controller, namely a light discharge controller CPU unit in the graph 1.
In this application embodiment, the discharge load array can be single resistance load array, and it includes first control unit, second control unit and precision resistance control unit, first control unit and second control unit connect, first control unit receives CPU's group control signal for the disconnection and the closure of the total switch of several groups's resistance load array of control, the multiple resistance control signal of second control unit receipt CPU for the setting resistance multiple, precision resistance control unit receives CPU's precision resistance control signal, is used for the precision of adjusting resistance. The discharging load array is an N-step resistance load array, the composition of each step of resistance load array is consistent with that of the discharging load array, the precision resistance control unit comprises a unit resistance unit, a decile resistance unit and a percentile resistance unit, and the unit resistance unit, the decile resistance unit and the percentile resistance unit are connected in parallel.
As shown in fig. 2, which is a schematic structural diagram of a discharge load array in the device, a first control unit receives a group control signal of a CPU, a second control unit receives a multiple resistance control signal of the CPU for setting a resistance multiple, a precision resistance control unit receives a precision resistance control signal of the CPU for adjusting the precision of a resistance, and by the above, the discharge load array is controlled to discharge a specified current value of the battery, wherein the first control unit and the second control unit each include a plurality of control subunits composed of a field effect transistor, a resistor and a diode, as shown in fig. 2, the precision resistance control unit receives the precision resistance control signal of the CPU through a multi-way switch control module, that is, the multi-way switch control module in fig. 2, receives the specific control subunits composed of a resistance unit control signal, a resistance tens control signal and a resistance percentage control signal, and optically couples the control unit resistance unit, the tens resistance unit and the percentage resistance unit through a multi-way switch control module, the unit resistance unit includes a unit group of one resistance and a unit of one resistance unit connected with another, the unit includes a resistance subunit group of ten resistance units connected in series, the resistance unit includes a resistance subunit group of ten resistance connected in parallel with another resistance unit, and a resistance subunit connected with another ten resistance unit, the resistance unit includes a resistance unit connected in parallel with a resistance unit connected with a resistance group of ten resistance unit, and a resistance unit connected with a ten percentage connected with a resistance unit, and a resistance unit connected with a ten resistance unit, and a resistance unit connected with a ten resistance unit, which includes a resistance unit connected in parallel connected with a resistance unit connected in parallel with a ten resistance unit, and a ten resistance unit connected in parallel with a ten resistance unit including ten resistance unit connected in parallel with a ten resistance unit, the unit resistance sub-unit, the ten-minute resistance sub-unit and the percentile resistance sub-unit are connected in parallel in pairs, first ends connected in parallel in pairs among the unit resistance sub-unit, the ten-minute resistance sub-unit and the percentile resistance sub-unit are set anodes and are connected with anodes of the tested storage battery, second ends connected in parallel in pairs among the unit resistance sub-unit, the ten-minute resistance sub-unit and the percentile resistance sub-unit are connected with first ends connected in parallel in pairs among the unit resistance sub-unit, the ten-minute resistance sub-unit and the percentile resistance sub-unit are also used as set cathodes and are connected with cathodes of the tested storage battery, and each resistance sub-unit comprises a resistor and a field effect tube which are connected with each other.
It should be noted that the above discharging load array is only a specific implementation manner in the embodiment of the present application, and any other discharging load array capable of discharging the battery to be tested at the specified current value is within the protection scope of the present application.
Correspondingly, the second embodiment of the present application further provides a method for determining a battery degradation failure inflection point, as shown in fig. 3, the method includes the following steps:
step 301, sending an instruction to a shallow discharge load control unit through a controller, so that the shallow discharge load control unit controls the tested storage battery to discharge at a specified current value according to the instruction.
And 302, controlling parameters of the tested storage battery in the discharging process through the shallow discharging load control unit and sending the parameters to the controller.
In the embodiment of the present application, the parameters specifically include a discharge time, a terminal voltage of the battery to be tested, a voltage difference between voltage samples of adjacent terminals, and a discharge current of the battery to be tested.
And 303, fitting the ampere-hour integral and the discharge curve of the tested storage battery through the controller according to the parameters to obtain a fitting curve, and determining a degradation failure inflection point based on the fitting curve.
In this embodiment of the present application, fitting the ampere-hour integral and the discharge curve of the measured battery by the controller according to the parameters specifically includes:
normalizing the discharge time, the terminal voltage sample time point and the terminal voltage sample in the parameters to obtain normalized data;
determining a voltage value under a discharge rate at a specified time by an interpolation method;
and fitting a discharge curve at the discharge rate of the specified time based on the normalized data and the voltage value at the discharge rate of the specified time to obtain a fitted curve of the voltage changing along with the time within the specified time.
The curve fitting procedure is as follows:
(1) Collecting and recording a given current and discharge voltage and discharge time samples of a plurality of points when the given current is subjected to shallow discharge, wherein the difference of the discharge voltage interval between the two points is not more than 5mV;
(2) And then obtaining a fitted mathematical logarithm function model of the discharge curve of the lead-acid storage battery by using the EXCEL table fitted curve function, wherein the fitted mathematical logarithm function model comprises the following steps: t = a × lnU + b, where T is the discharge time, U is the battery voltage, and a and b are constants.
(3) And fitting a discharge curve of a 10-hour rate by using the obtained mathematical model and the rated I10 current value of the given storage battery to obtain a discharge curve and capacity prediction of the storage battery.
(1) And (3) normalization operation: the normalization operation includes normalization of time and normalization of voltage, wherein:
the time normalization refers to the normalization operation of the sample time point and the total discharge time, namely Yt = tx/T, wherein T is the total discharge time, and tx is the normalization time period;
the normalization of the voltage refers to the normalization operation between the voltage and the nominal voltage at the sample time point, i.e. Yu = Ux-UB/Umax-UB, where UB is the nominal voltage and Umax is the maximum voltage.
And (3) curve fitting operation: the method is a process of fitting a 10-rate discharge curve between the obtained mathematical model and the rated I10 current value of a given storage battery to obtain the discharge curve.
Segmentation difference value: the segmentation difference calculation is a calculation process of voltage difference and time difference between different two samples.
In this embodiment of the present application, the determining a degradation failure inflection point based on the fitted curve specifically includes:
s801, dividing the fitting curve according to first interval time;
s802, sequentially determining the division points of which the voltage difference values with the previous division point in all the division points divided according to the first interval time exceed a first threshold value according to the time sequence, and taking the division points as undetermined division points;
s803, determining the time point of the first undetermined division point according to the time sequence, and taking the time point as a reference time point;
s804, dividing the fitting curve behind the reference time point according to a second interval time, then judging whether the voltage difference value between a second division point and a first division point divided according to the second interval time exceeds a second threshold value, if so, executing S805, otherwise, taking the time point of the next to-be-divided point as the reference time point and continuing executing S804, wherein the flow is ended when all the time points of the to-be-divided point are taken as the reference time points and do not enter S805;
and S805, determining a time point of a second division point divided according to a second interval time, dividing a fitted curve after the time point according to a third interval time, and judging whether a voltage difference value between the second division point divided according to the third interval time and the first division point exceeds a third threshold value, if so, taking the time point of the second division point divided according to the third interval time as a degeneration failure inflection point, otherwise, taking the time point of the next to-be-determined division point as a reference time point and continuing to execute S804.
Finally, it should be noted that: the above-mentioned embodiments are only specific embodiments of the present invention, which are used for illustrating the technical solutions of the present invention and not for limiting the same, and the protection scope of the present invention is not limited thereto, although the present invention 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 of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the embodiments of the present invention, and they should be construed as being included therein.
Claims (8)
1. A battery degradation failure inflection point determining apparatus, characterized by comprising:
the shallow discharge load control unit is connected with the controller and the tested storage battery, and is used for receiving an instruction of the controller, controlling the tested storage battery to discharge at a specified current value according to the instruction, and simultaneously collecting parameters of the tested storage battery in a discharge process and sending the parameters to the controller;
the controller configured to:
sending an instruction to the shallow discharge load control unit;
receiving parameters sent by the shallow discharge load control unit;
and fitting the ampere-hour integral and the discharge curve of the tested storage battery based on the parameters to obtain a fitting curve, and determining a degeneration failure inflection point based on the fitting curve.
2. The battery degradation failure inflection point determination device according to claim 1, wherein the shallow discharge load control unit includes:
the discharging load driving interface is used for receiving the instruction and controlling a discharging load array according to the instruction so as to discharge the tested storage battery with the specified current value;
and the discharge load array is a resistor sequence controlled by the discharge load driving interface.
3. The battery degradation failure inflection point determination device of claim 2, wherein the discharge load array includes a first control unit, a second control unit, and a precision resistance control unit, the first control unit and the second control unit are connected, the precision resistance control unit includes a unit resistance unit, a tenth resistance unit, and a percentile resistance unit, and the unit resistance unit, the tenth resistance unit, and the percentile resistance unit are connected in parallel.
4. The battery degradation failure inflection point determination apparatus as claimed in claim 1, wherein said parameters specifically include a discharge time, a terminal voltage of the battery under test, a voltage difference between adjacent terminal voltage samples, and a discharge current of the battery under test.
5. A battery degradation failure inflection point determining method applied to the apparatus according to any one of claims 1 to 4, the method comprising:
sending an instruction to a shallow discharge load control unit through a controller so that the shallow discharge load control unit controls the tested storage battery to discharge at a specified current value according to the instruction;
parameters of the tested storage battery in the discharging process are controlled by the shallow discharging load control unit and sent to the controller;
and fitting the ampere-hour integral and the discharge curve of the tested storage battery through the controller according to the parameters to obtain a fitting curve, and determining a degradation failure inflection point based on the fitting curve.
6. The method as claimed in claim 5, wherein the parameters include in particular the discharge time, a plurality of terminal voltage samples of the battery under test, the point in time of the terminal voltage samples and the discharge current of the battery under test.
7. The method of claim 6, wherein fitting the ampere-hour integral and the discharge curve of the measured battery according to the parameters by the controller specifically comprises:
normalizing the discharge time, the terminal voltage sample time point and the terminal voltage sample in the parameters to obtain normalized data;
determining a voltage value under a discharge rate at a specified time by an interpolation method;
and fitting a discharge curve at the discharge rate of the specified time based on the normalized data and the voltage value at the discharge rate of the specified time to obtain a fitted curve of the voltage changing along with the time within the specified time.
8. The method of claim 7, wherein determining a degradation failure inflection point based on the fitted curve comprises:
s801, dividing the fitting curve according to first interval time;
s802, sequentially determining the division points of which the voltage difference values with the previous division point in all the division points divided according to the first interval time exceed a first threshold value according to the time sequence, and taking the division points as undetermined division points;
s803, determining the time point of the first undetermined division point according to the time sequence, and taking the time point as a reference time point;
s804, dividing the fitting curve behind the reference time point according to a second interval time, then judging whether the voltage difference value between a second division point and a first division point divided according to the second interval time exceeds a second threshold value, if so, executing S805, otherwise, taking the time point of the next to-be-divided point as the reference time point and continuing executing S804, wherein the flow is ended when all the time points of the to-be-divided point are taken as the reference time points and do not enter S805;
and S805, determining a time point of a second division point divided according to a second interval time, dividing a fitted curve after the time point according to a third interval time, and judging whether a voltage difference value between the second division point divided according to the third interval time and the first division point exceeds a third threshold value, if so, taking the time point of the second division point divided according to the third interval time as a degeneration failure inflection point, otherwise, taking the time point of the next to-be-determined division point as a reference time point and continuing to execute S804.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210623796.0A CN115407202A (en) | 2022-06-02 | 2022-06-02 | Device and method for determining degradation failure inflection point of storage battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210623796.0A CN115407202A (en) | 2022-06-02 | 2022-06-02 | Device and method for determining degradation failure inflection point of storage battery |
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| CN115407202A true CN115407202A (en) | 2022-11-29 |
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| CN202210623796.0A Pending CN115407202A (en) | 2022-06-02 | 2022-06-02 | Device and method for determining degradation failure inflection point of storage battery |
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