CN112038720A - Battery total capacity correction method, control device and electric appliance - Google Patents
Battery total capacity correction method, control device and electric appliance Download PDFInfo
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- CN112038720A CN112038720A CN202010784754.6A CN202010784754A CN112038720A CN 112038720 A CN112038720 A CN 112038720A CN 202010784754 A CN202010784754 A CN 202010784754A CN 112038720 A CN112038720 A CN 112038720A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/48—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte
- H01M10/486—Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte for measuring temperature
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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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 belongs to the technical field of battery capacity correction, and particularly relates to a battery total capacity correction method, a control device and an electric appliance, wherein the battery total capacity correction method comprises the following steps: acquiring the accumulated charging capacity of the battery in a charging state; acquiring the state of the battery before charging according to the condition that the accumulated charging capacity is greater than or equal to the preset correction point capacity; acquiring the sleep time of the battery according to the sleep state of the battery before charging; acquiring the state of charge of the battery before charging according to the fact that the sleep time is longer than the preset time; calculating the charging amount of the battery in real time until the battery is fully charged; calculating the actual total capacity of the battery according to the state of charge and the charging amount, and taking the actual total capacity as the corrected total capacity of the battery; and updating the preset correction point capacity and finishing the correction. The method for correcting the total capacity of the battery provided by the invention realizes the periodic correction of the total capacity of the battery, improves the correction effect and solves the problem of poor correction effect of the total capacity of the battery.
Description
Technical Field
The invention belongs to the technical field of battery capacity correction, and particularly relates to a battery total capacity correction method, a control device and an electric appliance.
Background
This section provides background information related to the present disclosure only and is not necessarily prior art.
When a user uses an electric appliance such as a dust collector, the remaining capacity of the electric appliance needs to be acquired in real time, the ratio of the remaining capacity to the total capacity is also called as a battery State of Charge (SOC), the SOC is one of parameters representing the amount of electric power which can be currently supplied to the electric appliance by the battery, the calculation of the SOC has a close relationship with the actual total capacity of the battery, the actual total capacity of the battery is attenuated continuously along with the increase of the service life of the electric appliance, and the accuracy of the calculated SOC is gradually reduced, so that the actual total capacity needs to be corrected.
In the prior art, the actual total capacity is usually corrected by a full-discharge and full-charge mode, but the actual total capacity is poor in correction effect and inaccurate in correction result due to the fact that a user hardly reaches full discharge in the use process, and further the accuracy of the SOC is continuously reduced.
Disclosure of Invention
The invention aims to at least solve the problem of poor correction effect of the total capacity of the battery in the prior art. The purpose is realized by the following technical scheme:
the invention provides a method for correcting total capacity of a battery in a first aspect, which comprises the following steps:
acquiring the accumulated charging capacity of the battery in a charging state;
acquiring the state of the battery before charging according to the condition that the accumulated charging capacity is greater than or equal to the preset correction point capacity;
acquiring the sleep time of the battery according to the sleep state of the battery before charging;
acquiring the state of charge of the battery before charging according to the fact that the sleep time is longer than the preset time;
calculating the charging amount of the battery in real time until the battery is fully charged;
calculating the actual total capacity of the battery according to the state of charge and the charging amount, and taking the actual total capacity as the corrected total capacity of the battery;
and updating the preset correction point capacity and finishing correction.
According to the method for correcting the total capacity of the battery of the embodiment of the invention, under the condition that the accumulated charging capacity reaches the preset correction point capacity, judging whether the battery is in a dormant state before entering a charging state, comparing the dormant time with a preset time length, on the basis of ensuring that parameters including the open-circuit voltage of the battery are in a stable state, starting correction of the battery, the actual total capacity of the battery is calculated by acquiring the state of charge of the battery and calculating the amount of charge of the battery during the calibration process, the actual total capacity is taken as the total capacity of the battery after correction, the correction of the total capacity of the battery is realized, and the numerical value of the preset correction point capacity is updated on the basis, so as to carry out the next correction, therefore, the periodic correction of the total capacity of the battery is realized, the correction effect is improved, and the problem of poor correction effect of the total capacity of the battery is solved.
In addition, the method for correcting the total capacity of the battery according to the embodiment of the invention can also have the following technical characteristics:
in some embodiments of the invention, the obtaining the state of charge of the battery before charging comprises:
and acquiring the open-circuit voltage of the battery, and calculating the state of charge according to the open-circuit voltage-state of charge curve.
In some embodiments of the present invention, said calculating an actual total capacity of said battery based on said state of charge and said amount of charge, said taking said actual total capacity as a corrected total battery capacity comprises:
according to CFCC＝CSOC1(1-SOC1) calculating the actual total capacity;
wherein, CFCCTo said actual total capacity, CSOC1To the charge, SOC1 is the state of charge.
In some embodiments of the invention, the updating the preset correction point capacity comprises:
and adding the battery capacity of a preset correction interval to the preset correction point capacity to serve as the preset correction point capacity in the next correction.
In some embodiments of the present invention, the battery total capacity correction method further includes:
and according to the fact that the battery is not in a dormant state before charging or the dormant time is less than the preset duration, taking a value obtained by adding 1 to the preset value of the capacity of the correction point as a value of the capacity of the correction point preset in the next correction, and terminating the correction.
In some embodiments of the present invention, the battery total capacity correction method further includes:
and according to the charging interruption when the full charge of the battery is not completed, adding 1 to the value of the preset correction point capacity to obtain a value which is used as the value of the preset correction point capacity in the next correction, and terminating the correction.
In some embodiments of the present invention, before the obtaining the state of charge of the battery, the method further includes:
acquiring the maximum single-section voltage of the battery before charging;
and according to the condition that the maximum single-node voltage is more than 3.8V, taking the value obtained by adding 1 to the value of the preset correction point capacity as the value of the preset correction point capacity in the next correction, and terminating the correction.
In some embodiments of the present invention, before the obtaining the state of charge of the battery, the method further includes:
acquiring the cell temperature of the battery;
and according to the condition that the temperature of the battery core is less than 15 ℃ or more than 35 ℃, taking a value obtained by adding 1 to the value of the preset correction point capacity as a value of the preset correction point capacity in the next correction, and terminating the correction.
A second aspect of the present invention provides a control apparatus comprising a memory, a processor, and a control program stored in the memory and executable by the processor, the control program when executed implementing the total battery capacity correction method according to the first aspect of the present invention.
A third aspect of the invention provides an electrical appliance comprising a battery and a control device according to the second aspect of the invention.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like parts are designated by like reference numerals throughout the drawings. In the drawings:
FIG. 1 is a flow chart of a method for correcting the total capacity of a battery according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for correcting the total battery capacity according to another embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" may be intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof.
As shown in fig. 1, an embodiment of the first aspect of the present invention provides a battery total capacity correction method, including: s10, acquiring the accumulated charging capacity of the battery in the charging state; s20, acquiring the state of the battery before charging according to the condition that the accumulated charging capacity is larger than or equal to the preset correction point capacity; s30, acquiring the sleep time of the battery according to the sleep state of the battery before charging; s40, acquiring the state of charge of the battery before charging according to the fact that the sleep time is longer than the preset time; s50, calculating the charging quantity of the battery in real time until the battery is fully charged; s60, calculating the actual total capacity of the battery according to the state of charge and the charging quantity, and taking the actual total capacity as the corrected total capacity of the battery; and S70, updating the preset correction point capacity and finishing the correction.
The method for correcting the total capacity of the battery provided by the embodiment is performed in the charging process of the battery, and by judging whether the accumulated charging capacity reaches the preset correction point capacity, and judging whether the battery is in a dormant state before charging by detecting the dormant state and the dormant time, when the above items are ensured to meet the preset conditions, the correction of the battery is started, the actual total capacity of the battery is calculated by acquiring the state of charge of the battery and calculating the charging quantity of the battery in the correction process, the actual total capacity is taken as the total capacity of the battery after correction, the correction of the total capacity of the battery is realized, and the numerical value of the preset correction point capacity is updated on the basis, so as to carry out the next correction, therefore, the periodic correction of the total capacity of the battery is realized, the correction effect is improved, and the problem of poor correction effect of the total capacity of the battery is solved.
According to an embodiment of the present invention, the specific method for acquiring the accumulated charging capacity of the battery when the battery enters the charging state in step S10 may be: in the life cycle of the battery, the accumulated charging capacity is counted by a current integration method, that is, the accumulated charging capacity of the battery is calculated every time from the initial charging and discharging of the battery, and the accumulated result is stored and then the accumulated charging capacity is calculated. It should be noted that, a battery applied in an electrical appliance generally refers to a battery module or a battery pack, the battery described in this embodiment may be a battery pack, and the battery pack may include a plurality of battery modules, each of which includes a plurality of battery cells. Therefore, the accumulated charge capacity of the battery in the present embodiment refers to the accumulated charge capacity of all the battery cells.
After the accumulated charge capacity of the battery is obtained, the accumulated charge capacity needs to be compared with a preset correction point capacity, so as to judge whether the total capacity of the battery at the moment needs to be corrected. It should be noted that, in the present embodiment, the preset correction point capacity is a variable, and the preset correction point capacity continuously increases with the increase of the accumulated charging capacity, specifically, refer to the following detailed description of the preset correction point capacity updating method.
It should be noted that a preset correction point capacity is set when the battery leaves a factory, and a preset correction interval may also be set at the same time, when the number of times of charging the battery reaches the preset correction interval for the first time, the accumulated charging capacity of the battery theoretically reaches the preset correction point capacity when the battery leaves the factory, that is, the battery capacity corresponding to one preset correction interval is equal to the preset correction point capacity when the battery leaves the factory, and at this time, the total capacity of the battery may be corrected for the first time under the condition that other conditions are satisfied. The calibration point capacity and the preset calibration interval preset at the time of factory shipment are set according to factors such as the type of the battery, the rated total capacity, and the use environment, which is not particularly limited in this embodiment.
If the accumulated charging capacity is smaller than the preset correction point capacity, the total capacity of the battery at the moment is not required to be corrected, and a correction program is not started; if the accumulated charge capacity is greater than or equal to the preset correction point capacity, it indicates that the total battery capacity at this time needs to be corrected, that is, step S20 is performed to obtain the state of the battery before charging according to the accumulated charge capacity being greater than the preset correction point capacity or equal to the preset correction point capacity.
Before charging, the battery may be in a working state or a dormant state, where the dormant state is a static state, and each parameter of the battery in the static state is generally stable. The battery in the working state is continuously discharged, and parameters such as open-circuit voltage and the like of the battery are all in an unstable state, so that the battery in the working state cannot be detected and corrected; after the battery enters the dormant state from the working state, the discharging is gradually stopped, and parameters such as open-circuit voltage gradually tend to be stable, so that the condition for carrying out the next step is met when the battery is judged to enter the charging state from the dormant state, and otherwise, the battery does not enter a correction program.
Specifically, when it is determined that the battery is not in the sleep state before charging, the value of the preset correction point capacity may be increased by a natural number greater than or equal to 1 and smaller than the preset correction point capacity to obtain a value serving as the value of the preset correction point capacity at the time of the next correction, and then the correction may be terminated. It should be noted that, since the battery has satisfied the condition that the accumulated charging capacity is greater than or equal to the preset correction point capacity and the battery has entered the charging state, it is necessary to schematically record the unsuccessful correction of the battery by increasing the value of the preset correction point capacity in order to trigger the next correction procedure.
For example, the natural number of the preset correction point capacity increase may be 1, taking a battery with a capacity of 2Ah as an example, the preset correction interval is determined to be 20 times according to the battery capacity fading characteristic of the battery, and the charging capacity corresponding to 20 times of charging is 40Ah, that is, the preset correction point capacity when the battery leaves the factory is 40 Ah; when the battery is charged at a certain time, the obtained accumulated charging capacity reaches 40Ah, namely the accumulated charging capacity is equal to the preset correction point capacity, the battery enters a correction program, if the battery is detected to be in a working state before charging, the correction program is exited, before the correction is terminated, the preset correction point capacity 40Ah of the battery is added with 1Ah to obtain 41Ah, namely the preset correction point capacity used for being compared with the accumulated charging capacity before the next correction is 41 Ah.
When the battery is in the sleep state before charging, the present embodiment determines whether to enter the calibration procedure by acquiring the sleep time of the battery in step S30, and it can be understood that the longer the sleep time of the battery, the more stable the parameters such as the open-circuit voltage of the battery. Specifically, a preset time period is set, and the sleep time of the battery is compared with the preset time period, it should be noted that the preset time period in this embodiment may be set according to factors such as the type of the battery, the voltage, and the use environment, for example, the preset time period may be set to 15 minutes to 35 minutes.
For example, the preset time period may be set to 30 minutes, and according to the actual use condition of the battery in the electrical appliance, most batteries are in a stable state after standing for 30 minutes, that is, parameters such as open-circuit voltage of the battery are already stable, so as to facilitate subsequent obtaining of the state of charge.
When the sleep time is less than the preset time, it indicates that the parameters such as the open-circuit voltage of the battery are still in an unstable state, and the condition for correcting the total capacity of the battery is not satisfied. Illustratively, the preset natural number of increase in the capacity of the correction point may be 1.
When the sleep time is longer than the preset time, it indicates that the parameters such as the open-circuit voltage of the battery are already in a stable state, and the condition for correcting the total capacity of the battery is met, and the method may enter a correction procedure, that is, step S40 is performed to obtain the state of charge of the battery.
In some embodiments of the present invention, the method for obtaining the state of charge of the battery in step S40 includes: the method includes the steps of firstly obtaining an Open-circuit voltage of a battery, and then calculating a State of charge (State of charge, SOC) according to a corresponding relation curve of the Open-circuit voltage (OCV) and the State of charge (SOC), namely an OCV-SOC curve. The specific process of calculating the state of charge using the OCV-SOC curve in the present embodiment may be performed according to a calculation method using an OCV-SOC curve in the related art.
After the state of charge is acquired, step S50 is executed to calculate the charge amount of the battery in real time. In the present embodiment, the charge amount of the battery refers to the battery capacity charged from the start of charging the battery to the time when the battery is fully charged. Specifically, in this embodiment, the original charging amount stored in the program is cleared first, and then the charging amount is calculated, in an embodiment of the present invention, the method for calculating the charging amount of the battery is a current-time integration method, and the specific process of calculating the charging amount by using the current-time integration method in this embodiment may be performed according to a current-time integration method in the prior art.
In the process of calculating the charging amount of the battery in real time, if the condition that the battery is fully charged is not satisfied, the correction of the total capacity of the battery cannot be completed, and therefore, in some embodiments of the present invention, when the full charge of the battery is not completed, the charging process is interrupted, the value of the preset correction point capacity is increased by a natural number which is greater than or equal to 1 and less than the preset correction point capacity, the obtained value is used as the value of the preset correction point capacity at the time of the next correction, and then the correction is terminated. Illustratively, the preset natural number of increase in the capacity of the correction point may be 1.
If the condition that the battery is fully charged is satisfied, step S60 is executed, i.e., the actual total capacity of the battery is calculated based on the state of charge acquired in step S40 and the amount of charge calculated in step S50, and the calculated result is used as the corrected total capacity of the battery.
Specifically, in one embodiment of the present invention, the method of calculating the actual total capacity of the battery is according to formula CFCC＝CSOC1/(1-SOC1) calculation, where CFCCTo actual total capacity, CSOC1The SOC1 is a state of charge, and is a value reflecting the remaining capacity of the battery, and is numerically defined as a ratio of the remaining capacity to the battery capacity, and is expressed by a percentage in common use, so the value of the SOC ranges from 0 to 1, indicating that the battery is completely discharged when the SOC is 0, and indicating that the battery is completely charged when the SOC is 1. In the present embodiment, "1-SOC 1" represents the ratio of the amount of charged electricity to the battery capacity, and the calculated charge amount C is usedSOC1Dividing by the ratio to obtain the actual total capacity of the battery.
After the total capacity of the battery is successfully corrected, the preset capacity of the correction point is updated in the present embodiment, it should be noted that, in the life cycle of the battery, as the number of charging times and the number of correction times increase, the preset capacity of the correction point also needs to be continuously increased. Illustratively, a preset correction interval is set when the battery leaves a factory, and when the charging times of the battery reach the preset correction interval, the accumulated charging capacity of the battery theoretically reaches the preset correction point capacity; after one time of calibration is successful, the preset calibration point capacity needs to be increased, so that the accumulated charging capacity of the battery is smaller than the preset calibration point capacity during the next charging, that is, the battery does not need to be calibrated during each charging, and therefore, after charging and discharging for a period of time, when the accumulated charging capacity of the battery reaches the updated preset calibration point capacity, the calibration procedure can be continuously executed.
In one embodiment of the present invention, the method for updating the preset correction point capacity comprises: and adding the preset correction point capacity to the battery capacity of a preset correction interval to be used as the preset correction point capacity in the next correction. The battery capacity of a preset correction interval is equal to the preset correction point capacity when the battery leaves the factory, namely the factory initial value of the preset correction point capacity.
Exemplarily, taking a battery with a capacity of 2Ah as an example, according to the battery capacity fading characteristic of the battery, determining that the preset correction interval is 20 times, and the charging capacity corresponding to 20 times of charging is 40Ah, that is, the preset correction point capacity of the battery when the battery leaves the factory is 40 Ah; when the battery is charged at a certain time, the obtained accumulated charging capacity reaches 40Ah, the battery is in a dormant state before charging, the dormant time is longer than the preset time length, the battery enters a correction program for the first time, after the actual total capacity is calculated by using the charge state and the charge amount of the battery, the preset correction point capacity 40Ah of the battery is added with the battery capacity corresponding to a preset correction interval, namely the battery capacity is added with 40Ah to obtain 80Ah, namely the preset correction point capacity used for being compared with the accumulated charging capacity before the second correction is 80Ah, and so on, the preset correction point capacity used for being compared with the accumulated charging capacity before the third correction is 120Ah, and the preset correction point capacity used for being compared with the accumulated charging capacity before the fourth correction is 160 Ah.
Further, in some embodiments of the present invention, when the accumulated charging capacity is greater than or equal to the preset correction point capacity, the battery is in a sleep state before charging, and the sleep time is greater than the preset time length, before acquiring the state of charge of the battery, the maximum single-node voltage before charging the battery needs to be detected, it should be noted that, if the maximum single-node voltage before charging the battery is too high, it is not favorable to acquire a stable open-circuit voltage, and the state of charge calculated by using the OCV-SOC curve subsequently is inaccurate. In the embodiment, the maximum single-node voltage is increased as a condition for entering the correction program, and the accuracy of the correction of the total capacity of the battery is improved by improving the accuracy of the state of charge.
Specifically, the acquired maximum single-node voltage before the battery is charged is compared with a set voltage value, when the maximum single-node voltage is equal to or exceeds the set voltage value, a natural number which is greater than or equal to 1 and smaller than the preset correction point capacity is added to the preset correction point capacity value, the obtained value is used as the preset correction point capacity value in the next correction, and then the correction is terminated; illustratively, the preset natural number of increase in the capacity of the correction point may be 1. And when the maximum single-node voltage is smaller than the set voltage value, executing a correction program, namely acquiring the state of charge of the battery, calculating the charging amount and the like.
In this embodiment, the set voltage value may be set according to factors such as the type of the battery, the voltage, the usage environment, and the like, for example, the set voltage value may be set to any value between 3.6V and 3.85V; preferably, the set voltage value may be set to 3.8V, and when the maximum single node voltage is greater than 3.8V, the value of the preset correction point capacity is increased by one to obtain a value as the value of the correction point capacity preset at the time of the next correction, and then the correction is terminated.
Further, in some embodiments of the present invention, when the accumulated charging capacity is greater than or equal to the preset correction point capacity, the battery is in a sleep state before charging, and the sleep time is greater than the preset time length, before acquiring the state of charge of the battery, the cell temperature when the battery enters the charging state needs to be detected, it should be noted that if the cell temperature is too low or too high, the electric capacity of the battery is in an abnormal state, and the acquired open-circuit voltage is inaccurate, which results in inaccurate state of charge calculated by using the OCV-SOC curve. In the embodiment, the accuracy of the correction of the total capacity of the battery is improved by increasing the cell temperature as a condition for entering the correction program and improving the accuracy of the state of charge.
Specifically, the acquired cell temperature is compared with a set temperature range, when the cell temperature does not fall within the set temperature range, a natural number which is greater than or equal to 1 and smaller than the preset correction point capacity is added to the preset correction point capacity value, the obtained value is used as the preset correction point capacity value in the next correction, and then the correction is terminated; illustratively, the preset natural number of increase in the capacity of the correction point may be 1. And when the cell temperature falls into the set temperature range, executing a correction program, namely acquiring the state of charge of the battery.
The set temperature range may be set according to factors such as the type of the battery and the use environment, for example, the temperature range may be set to 15 ℃ to 35 ℃, preferably, the temperature range may be set to 20 ℃ to 30 ℃, when the cell temperature is less than 15 ℃ or greater than 35 ℃, the value of the preset correction point capacity is increased by 1 to obtain a value as the value of the preset correction point capacity at the next correction, and then the correction is terminated.
For a detailed and complete explanation of the total battery capacity correction method of the present invention, another embodiment of the total battery capacity correction method of the present invention is explained below by the specific steps in fig. 2:
as shown in fig. 2, the method for correcting the total battery capacity in the present embodiment includes:
s110, acquiring the accumulated charging capacity of the battery when the battery is charged, judging whether the accumulated charging capacity is larger than or equal to the preset correction point capacity, if so, executing a step S120, and if not, executing a step S520;
s120, judging whether the battery enters a charging state from a dormant state, if so, executing a step S130, otherwise, executing a step S520;
s130, acquiring the sleep time of the battery, judging whether the sleep time exceeds thirty minutes, if so, executing the step S140, and if not, executing the step S520;
s140, acquiring the maximum single-section voltage of the battery before charging, judging whether the maximum single-section voltage is less than 3.8V, if so, executing a step S150, and if not, executing a step S520;
s150, acquiring the cell temperature when the battery enters a charging state, judging whether the cell temperature is in the range of 20-30 ℃, if so, executing the step S160, and if not, executing the step S520;
s210, acquiring the open-circuit voltage of the battery, and calculating to obtain the state of charge SOC1 before charging according to the corresponding relation curve of the open-circuit voltage and the state of charge;
s220, calculating to obtain a charging quantity C by using a current time integration methodSOC1；
S310, judging whether the battery is fully charged, if so, executing a step S400, otherwise, executing a step S320;
s320, judging whether the battery stops charging, if so, executing a step S520, otherwise, returning to the step S310;
s400, according to CFCC＝CSOC1/(1-SOC1) calculation yields the actual total capacity CFCCThe actual total capacity CFCCAs the corrected total battery capacity, step S510 is then performed;
s510, adding the preset correction point capacity and the battery capacity corresponding to a preset correction interval to serve as the preset correction point capacity in the next correction, and then executing the step S600;
s520, adding 1 to the preset correction point capacity to serve as the preset correction point capacity in the next correction;
and S600, finishing the correction.
In the method for correcting the total capacity of the battery provided in this embodiment, after the battery enters a charging state, the accumulated charging capacity of the battery, the state of the battery before charging, the time of the battery in a sleep state, the maximum single-node voltage of the battery before charging, and the temperature of the battery cell when the battery enters the charging state are sequentially acquired and judged, and under the condition that the accumulated charging capacity reaches the preset correction point capacity, the state of the battery is judged to ensure that parameters such as open-circuit voltage of the battery are in a stable state; setting a specified range for the maximum single-node voltage and the battery core temperature to reduce the error when the open-circuit voltage is acquired subsequently; after the above conditions are met, a correction program for the battery is entered, in the correction process, the actual total capacity of the battery is calculated by obtaining the state of charge of the battery and calculating the charge quantity of the battery, the actual total capacity is taken as the corrected total capacity of the battery, the correction for the total capacity of the battery is realized, and on the basis, the preset correction point capacity plus the battery capacity corresponding to a preset correction interval is taken as the preset correction point capacity in the next correction, so that the next correction is carried out, thereby realizing the periodic correction for the total capacity of the battery, improving the correction effect and solving the problem of poor correction effect of the total capacity of the battery.
A second aspect of the present invention provides a control apparatus comprising a memory, a processor and a control program, wherein the control program is stored in the memory and is adapted to run on, i.e. be executable by, the processor, the control program when executed implementing the total battery capacity correction method according to the first aspect of the present invention.
A third aspect of the invention provides an electrical appliance comprising a battery and a control device according to the second aspect of the invention. In this embodiment, the electric appliance is a rechargeable household appliance including a battery pack, and specifically may be a handheld dust collector, a sweeping robot, or the like.
Specifically, the control device is in communication connection with the battery and is used for receiving and storing data such as accumulated charging capacity, preset correction point capacity, a state, duration time and preset time length of the state of the battery, and the processor in the control device is used for calculating data such as a state of charge, a charging amount and total capacity of the battery. In addition, in the using process of the electric appliance, the control device can calculate the residual capacity through the corrected total capacity of the battery, transmit the data of the residual capacity to the display device of the electric appliance and display the residual capacity to a user in a display or voice mode.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A method for correcting a total battery capacity, comprising:
acquiring the accumulated charging capacity of the battery in a charging state;
acquiring the state of the battery before charging according to the condition that the accumulated charging capacity is greater than or equal to the preset correction point capacity;
acquiring the sleep time of the battery according to the sleep state of the battery before charging;
acquiring the state of charge of the battery before charging according to the fact that the sleep time is longer than the preset time;
calculating the charging amount of the battery in real time until the battery is fully charged;
calculating the actual total capacity of the battery according to the state of charge and the charging amount, and taking the actual total capacity as the corrected total capacity of the battery;
and updating the preset correction point capacity and finishing correction.
2. The method of claim 1, wherein the obtaining the state of charge of the battery before charging comprises:
and acquiring the open-circuit voltage of the battery, and calculating the state of charge according to the open-circuit voltage-state of charge curve.
3. The battery total capacity correction method according to claim 1, wherein the calculating of the actual total capacity of the battery from the state of charge and the amount of charge, the taking of the actual total capacity as the corrected battery total capacity includes:
according to CFCC＝CSOC1(1-SOC1) calculating the actual total capacity;
wherein, CFCCIs that it isActual total capacity, CSOC1To the charge, SOC1 is the state of charge.
4. The battery total capacity correction method according to claim 1, wherein the updating the preset correction point capacity includes:
and adding the battery capacity of a preset correction interval to the preset correction point capacity to serve as the preset correction point capacity in the next correction.
5. The total battery capacity correction method according to claim 1, characterized in that the total battery capacity correction method further comprises:
and according to the fact that the battery is not in a dormant state before charging or the dormant time is less than the preset duration, taking a value obtained by adding 1 to the preset value of the capacity of the correction point as a value of the capacity of the correction point preset in the next correction, and terminating the correction.
6. The total battery capacity correction method according to claim 1, characterized in that the total battery capacity correction method further comprises:
and according to the charging interruption when the full charge of the battery is not completed, adding 1 to the value of the preset correction point capacity to obtain a value which is used as the value of the preset correction point capacity in the next correction, and terminating the correction.
7. The battery total capacity correction method according to any one of claims 1 to 6, characterized by further comprising, before the acquiring the state of charge of the battery:
acquiring the maximum single-section voltage of the battery before charging;
and according to the condition that the maximum single-node voltage is more than 3.8V, taking the value obtained by adding 1 to the value of the preset correction point capacity as the value of the preset correction point capacity in the next correction, and terminating the correction.
8. The battery total capacity correction method according to any one of claims 1 to 6, characterized by further comprising, before the acquiring the state of charge of the battery:
acquiring the cell temperature of the battery;
and according to the condition that the temperature of the battery core is less than 15 ℃ or more than 35 ℃, taking a value obtained by adding 1 to the value of the preset correction point capacity as a value of the preset correction point capacity in the next correction, and terminating the correction.
9. A control apparatus comprising a memory, a processor, and a control program stored in the memory and executable by the processor, the control program when executed implementing the total battery capacity correction method according to any one of claims 1 to 8.
10. An electrical appliance comprising a battery and a control device according to claim 9, the control device being in communicative connection with the battery.
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