CN116908701A - Battery capacity calibration method, device and equipment - Google Patents
Battery capacity calibration method, device and equipment Download PDFInfo
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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Abstract
The invention discloses a battery capacity calibration method, a device and equipment, wherein the method comprises the following steps: when the discharge of the battery to be calibrated is detected, acquiring an initial residual capacity value at the current moment, and determining an initial discharge capacity according to the current full charge capacity; according to the discharge quantity statistics time interval, current values and temperature values at different moments are obtained, and according to a discharge efficiency comparison table, the discharge efficiencies at different moments are obtained; the discharge efficiency is the ratio of the full discharge capacity to the rated full charge capacity corresponding to different current values and temperature values; according to the current values, the discharge efficiency and the discharge quantity statistical time intervals at different moments, obtaining the discharge quantity in each discharge quantity statistical time period; when the battery to be calibrated is detected to be completely discharged, acquiring total discharge according to the discharge in each discharge statistics time period, and acquiring current full charge capacity according to the initial discharge so as to update the full charge capacity value of the battery to be calibrated. The invention can reduce the calculation deviation of full charge capacity caused by temperature change.
Description
Technical Field
The present invention relates to the field of battery technologies, and in particular, to a method and an apparatus for calibrating battery capacity, and a terminal device.
Background
Recently, chargeable and dischargeable batteries are widely used as energy sources for mobile devices, auxiliary power devices, electric Vehicles (EVs), hybrid Electric Vehicles (HEVs), plug-in hybrid electric vehicles (plug-in HEVs), or similar electronic devices. In the use process of the battery, the actual available capacity of the battery is changed along with the change of the actual available capacity due to the influence of the ambient temperature, the conventional method for calibrating the full charge capacity of the battery is generally based on an ampere-hour integral algorithm, namely, the total capacity in the whole process of charging or discharging is counted, the counted total capacity is used as the full charge capacity of the battery, however, if the full charge capacity is updated under the condition of lower ambient temperature at present, the updated full charge capacity is smaller than the full charge capacity calibrated under the normal temperature environment, and when the ambient temperature rises, the deviation between the actual full charge capacity of the battery and the full charge capacity obtained by calibration is larger. Therefore, the existing method for calibrating the full charge capacity of the battery has large calculation deviation of the full charge capacity caused by the change of the ambient temperature, so that the calibration accuracy is low.
Disclosure of Invention
The invention provides a method, a device and equipment for calibrating the capacity of a battery, which can obviously reduce the calculation deviation of the full charge capacity caused by the change of the ambient temperature by introducing the discharge efficiency of the battery to be calibrated under different current values and temperature values in the calculation process of the full charge capacity, thereby improving the calibration accuracy of the full charge capacity.
In order to solve the above technical problems, a first aspect of an embodiment of the present invention provides a battery capacity calibration method, including the following steps:
when the discharge of the battery to be calibrated is detected, acquiring an initial residual capacity value of the battery to be calibrated at the current moment, and determining an initial discharge capacity according to the initial residual capacity value and the current full charge capacity;
according to a preset discharge quantity statistical time interval, current values and temperature values of the battery to be calibrated at different moments in the discharge process are obtained, and according to the current values, the temperature values and a preset discharge efficiency comparison table, the discharge efficiency of the battery to be calibrated at different moments in the discharge process is obtained; the discharge efficiency is the ratio of the full discharge capacity corresponding to different current values and temperature values to the preset rated full charge capacity;
according to the current values, the discharge efficiency and the discharge quantity statistical time intervals at different moments in the discharge process, obtaining the discharge quantity of the battery to be calibrated in each discharge quantity statistical time period;
when the battery to be calibrated is detected to be completely discharged, the total discharge capacity of the battery to be calibrated in the discharging process is obtained according to the discharge capacity of the battery to be calibrated in each discharge capacity statistical time period, and the current full charge capacity of the battery to be calibrated is obtained according to the total discharge capacity and the initial discharge capacity, so that the full charge capacity value of the battery to be calibrated is updated by utilizing the current full charge capacity.
As a preferred solution, the obtaining the current value and the temperature value of the battery to be calibrated at different moments in the discharging process according to the preset discharge amount statistical time interval specifically includes the following steps:
determining a plurality of discharge quantity statistical moments in the discharge process according to the discharge initial moment of the battery to be calibrated and the discharge quantity statistical time interval;
in the discharging process, when the current moment is detected to be any discharge quantity statistical moment, acquiring a plurality of current values and temperature values of the battery to be calibrated in a plurality of first preset time periods before the current moment;
the initial discharge time is the time when the battery to be calibrated is detected to discharge;
and the temperature value is an average temperature value obtained by calculation based on temperature sampling values corresponding to a plurality of temperature sampling points on the battery to be calibrated.
As a preferred solution, the method for obtaining the discharge efficiency of the battery to be calibrated at different moments in the discharge process according to the current value, the temperature value and a preset discharge efficiency comparison table specifically includes the following steps:
according to the current values, the temperature values and the preset discharge efficiency comparison tables in a plurality of first preset time periods before the discharge amount statistics time, average discharge efficiencies of the batteries to be calibrated in the first preset time periods before the discharge amount statistics time are obtained, and the minimum values in the average discharge efficiencies in the plurality of first preset time periods before the discharge amount statistics time are respectively used as the discharge efficiencies of the batteries to be calibrated at different time points in the discharge process.
As a preferred solution, the obtaining the discharge amount of the battery to be calibrated in each discharge amount statistical time period according to the current value, the discharge efficiency and the discharge amount statistical time interval at different moments in the discharge process specifically includes the following steps:
obtaining a first discharge capacity of the battery to be calibrated in each discharge capacity statistical time period according to products of the current values and the discharge capacity statistical time intervals at different moments in the discharge process;
and obtaining the discharge quantity of the battery to be calibrated in each discharge quantity counting time period according to the ratio of the first discharge quantity in each discharge quantity counting time period to the discharge efficiency at different moments in the discharge process.
Preferably, the method further comprises the steps of:
acquiring a plurality of current values and temperature values of the battery to be calibrated in a second preset time period before the discharge end time of the battery to be calibrated;
obtaining average discharge efficiency of the battery to be calibrated in the second preset time period according to the current values, the temperature values and the preset discharge efficiency comparison table in the second preset time period;
Acquiring the current ideal full charge capacity of the battery to be calibrated according to the average discharge efficiency and the rated full charge capacity of the battery to be calibrated in the second preset time period;
calculating a deviation value between the current full charge capacity and the current ideal full charge capacity;
when the deviation value is smaller than or equal to a preset deviation threshold value, updating the full charge capacity value of the battery to be calibrated by utilizing the current full charge capacity;
when the deviation value is larger than the preset deviation threshold value, carrying out average calculation on the current full charge capacity and the current ideal full charge capacity to obtain average full charge capacity, and updating the full charge capacity value of the battery to be calibrated by utilizing the average full charge capacity;
the discharging end time is the time when the battery to be calibrated is detected to be completely discharged;
and the temperature value is an average temperature value obtained by calculation based on temperature sampling values corresponding to a plurality of temperature sampling points on the battery to be calibrated.
As a preferred solution, the method specifically obtains the preset discharge efficiency comparison table through the following steps S61 to S65:
step S61, controlling the battery for test to discharge from a full charge state under different preset temperature values and preset current values until the battery for test is completely discharged;
Step S62, obtaining the discharge amount of the battery for test under different preset temperature values and preset current values according to the total discharge duration of the battery for test under different preset temperature values and preset current values;
step S63, according to the discharge capacity and the rated full charge capacity under different preset temperature values and preset current values, the undetermined discharge efficiency of the battery for testing under different preset temperature values and preset current values is obtained;
step S64, charging the battery for test to a full charge state, and re-executing the steps S61 to S63 until the number of times of complete discharge of the battery for test reaches a preset number of times threshold, and carrying out average calculation on a plurality of obtained to-be-determined discharge efficiencies of the battery for test under different preset temperature values and preset current values to obtain target discharge efficiency;
step S65, generating the preset discharge efficiency comparison table according to the target discharge efficiencies of the test battery under different preset temperature values and preset current values.
Preferably, the method further comprises the steps of:
In the discharging process, when detecting that the current moment is any one of the discharging quantity counting moments, obtaining a remaining capacity value of the battery to be calibrated at the current moment according to the remaining capacity value of the battery to be calibrated at the previous moment and the discharging quantity in a discharging quantity counting time period corresponding to the current moment, so as to update the remaining capacity value of the battery to be calibrated by using the remaining capacity value at the current moment;
when the current moment is the first discharge quantity counting moment, the moment before the current moment is the discharge initial moment, the residual capacity value of the battery to be calibrated at the moment before the current moment is the initial residual capacity value, and the discharge quantity counting time period corresponding to the current moment is the time period between the discharge initial moment and the current moment;
when the current moment is not the first discharge quantity counting moment, the moment before the current moment is the previous discharge quantity counting moment, the residual capacity value of the battery to be calibrated at the moment before the current moment is the residual capacity value of the battery to be calibrated at the previous discharge quantity counting moment, and the discharge quantity counting time period corresponding to the current moment is the time period between the previous discharge quantity counting moment and the current moment.
Preferably, the method further comprises the steps of:
when the deviation value is smaller than or equal to a preset deviation threshold value, obtaining the current battery health of the battery to be calibrated according to the ratio of the current full charge capacity to the rated full charge capacity;
when the deviation value is larger than the preset deviation threshold value, obtaining the current battery health degree of the battery to be calibrated according to the ratio of the average full charge capacity to the rated full charge capacity;
and updating the battery health of the battery to be calibrated by utilizing the current battery health.
A second aspect of an embodiment of the present invention provides a battery capacity calibration device, including:
the initial discharge quantity acquisition module is used for acquiring an initial residual capacity value of the battery to be calibrated at the current moment when the battery to be calibrated is detected to be discharged, and determining an initial discharge quantity according to the initial residual capacity value and the current full charge capacity;
the device comprises a discharge efficiency acquisition module, a calibration module and a calibration module, wherein the discharge efficiency acquisition module is used for acquiring current values and temperature values of the battery to be calibrated at different moments in the discharge process according to a preset discharge quantity statistical time interval, and acquiring the discharge efficiency of the battery to be calibrated at different moments in the discharge process according to the current values, the temperature values and a preset discharge efficiency comparison table; the discharge efficiency is the ratio of the full discharge capacity corresponding to different current values and temperature values to the preset rated full charge capacity;
The discharge quantity acquisition module is used for acquiring the discharge quantity of the battery to be calibrated in each discharge quantity counting time period according to the current values, the discharge efficiency and the discharge quantity counting time interval at different moments in the discharge process;
and the full charge capacity calibration module is used for acquiring the total discharge capacity of the battery to be calibrated in the discharge process according to the discharge capacity of the battery to be calibrated in each discharge capacity statistical time period when the battery to be calibrated is detected to be completely discharged, and acquiring the current full charge capacity of the battery to be calibrated according to the total discharge capacity and the initial discharge capacity so as to update the full charge capacity value of the battery to be calibrated by utilizing the current full charge capacity.
A third aspect of an embodiment of the present invention provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the battery capacity calibration method according to any one of the first aspects when executing the computer program.
Compared with the prior art, the method and the device have the beneficial effects that the discharge efficiency of the battery to be calibrated under different current values and temperature values is introduced in the calculation process of the full charge capacity, so that the calculation deviation of the full charge capacity caused by the change of the ambient temperature can be remarkably reduced, and the calibration accuracy of the full charge capacity is improved.
Drawings
FIG. 1 is a flow chart of a battery capacity calibration method in an embodiment of the invention;
fig. 2 is a schematic diagram of a battery capacity calibration device in an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a first aspect of the embodiment of the present invention provides a battery capacity calibration method, including steps S1 to S4 as follows:
step S1, when the discharge of a battery to be calibrated is detected, acquiring an initial residual capacity value of the battery to be calibrated at the current moment, and determining an initial discharge amount according to the initial residual capacity value and the current full charge capacity;
step S2, according to a preset discharge quantity statistical time interval, current values and temperature values of the battery to be calibrated at different moments in the discharge process are obtained, and according to the current values, the temperature values and a preset discharge efficiency comparison table, the discharge efficiency of the battery to be calibrated at different moments in the discharge process is obtained; the discharge efficiency is the ratio of the full discharge capacity to the rated full charge capacity corresponding to different current values and temperature values;
Step S3, according to the current values, the discharge efficiency and the discharge quantity statistical time intervals at different moments in the discharge process, obtaining the discharge quantity of the battery to be calibrated in each discharge quantity statistical time period;
and S4, when the battery to be calibrated is detected to be completely discharged, acquiring the total discharge capacity of the battery to be calibrated in the discharging process according to the discharge capacity of the battery to be calibrated in each discharge capacity statistical time period, and acquiring the current full charge capacity of the battery to be calibrated according to the total discharge capacity and the initial discharge capacity so as to update the full charge capacity value of the battery to be calibrated by utilizing the current full charge capacity.
In step S1, when the battery to be calibrated is detected to be discharged, since the battery to be calibrated may not be discharged from the full charge state, and may be discharged when the SOC is 98%, 90% or 80%, the embodiment obtains the initial residual capacity value of the battery to be calibrated at the current time, and it should be noted that the residual capacity value is usually stored in the internal software, and when the battery to be calibrated is detected to be discharged, the initial residual capacity value of the battery to be calibrated at the current time may be directly read from the internal software. Further, the initial discharge amount, i.e., initial discharge amount=current full charge capacity-initial residual capacity value, is determined according to the difference between the current full charge capacity and the initial residual capacity value. It is worth to say that, if the current calibration is the first time, the current full charge capacity is the rated full charge capacity preset for the battery to be calibrated; in addition, when the battery to be calibrated is discharged from the full charge state, the initial discharge capacity is 0mAh.
In step S2, since the discharge current value of the battery to be calibrated and the temperature value of the surrounding environment may change during the discharging process, the current value and the temperature value of the battery to be calibrated at different moments during the discharging process are obtained according to the preset discharge amount statistics time interval, which is worth to be explained, but the discharge amount statistics time interval may be set according to actual requirements, and the embodiment is not limited specifically herein. Further, according to the obtained current value and temperature value, the discharge efficiency of the battery to be calibrated at different moments in the discharge process can be obtained in a preset discharge efficiency comparison table, and it can be understood that the discharge efficiency of the battery to be calibrated under different temperature values and current values is recorded in the preset discharge efficiency comparison table.
In step S3, according to the current values, the discharge efficiencies and the discharge amount statistics time intervals at different moments, the discharge amounts of the battery to be calibrated in each discharge amount statistics time period can be obtained, and since the discharge efficiencies are introduced, the obtained discharge amounts are less affected by the environmental temperature change, so that the accuracy is higher.
In step S4, when it is detected that the battery to be calibrated is completely discharged, i.e. the electric quantity is exhausted, the discharge amounts in each discharge amount statistics time period are accumulated, so as to obtain the total discharge amount of the battery to be calibrated in the whole discharge process, and the total discharge amount and the initial discharge amount are accumulated, so as to obtain the current full charge capacity of the battery to be calibrated.
According to the battery capacity calibration method provided by the embodiment of the invention, the discharge efficiency of the battery to be calibrated under different current values and temperature values is introduced in the calculation process of the full charge capacity, so that the calculation deviation of the full charge capacity caused by the change of the ambient temperature can be remarkably reduced, and the calibration accuracy of the full charge capacity is improved.
As a preferred solution, the obtaining the current value and the temperature value of the battery to be calibrated at different moments in the discharging process according to the preset discharge amount statistical time interval specifically includes the following steps:
determining a plurality of discharge quantity statistical moments in the discharge process according to the discharge initial moment of the battery to be calibrated and the discharge quantity statistical time interval;
in the discharging process, when the current moment is detected to be any discharge quantity statistical moment, acquiring a plurality of current values and temperature values of the battery to be calibrated in a plurality of first preset time periods before the current moment;
the initial discharge time is the time when the battery to be calibrated is detected to discharge;
and the temperature value is an average temperature value obtained by calculation based on temperature sampling values corresponding to a plurality of temperature sampling points on the battery to be calibrated.
It can be understood that, based on the discharge initial time and the discharge amount statistical time interval of the battery to be calibrated, from the discharge initial time, each discharge amount statistical time interval is a discharge amount statistical time, and based on this, a plurality of discharge amount statistical times in the discharge process can be determined.
Further, the first preset time period may be set according to actual requirements, such as 1s, 5s, 10s, etc., which is not specifically limited herein. It should be noted that, the discharging current value and the temperature value inside the battery are detected and stored in real time, so that the present embodiment can obtain a plurality of current values and temperature values stored in advance in a plurality of first preset time periods before the present moment.
As a preferred solution, the method for obtaining the discharge efficiency of the battery to be calibrated at different moments in the discharge process according to the current value, the temperature value and a preset discharge efficiency comparison table specifically includes the following steps:
according to the current values, the temperature values and the preset discharge efficiency comparison tables in a plurality of first preset time periods before the discharge amount statistics time, average discharge efficiencies of the batteries to be calibrated in the first preset time periods before the discharge amount statistics time are obtained, and the minimum values in the average discharge efficiencies in the plurality of first preset time periods before the discharge amount statistics time are respectively used as the discharge efficiencies of the batteries to be calibrated at different time points in the discharge process.
It should be noted that, according to the current values and the temperature values in each first preset time period, the discharge efficiencies in each first preset time period can be obtained in the preset discharge efficiency comparison table, and after the average calculation, the average discharge efficiency of the battery to be calibrated in each first preset time period can be obtained.
As a preferred solution, the obtaining the discharge amount of the battery to be calibrated in each discharge amount statistical time period according to the current value, the discharge efficiency and the discharge amount statistical time interval at different moments in the discharge process specifically includes the following steps:
obtaining a first discharge capacity of the battery to be calibrated in each discharge capacity statistical time period according to products of the current values and the discharge capacity statistical time intervals at different moments in the discharge process;
And obtaining the discharge quantity of the battery to be calibrated in each discharge quantity counting time period according to the ratio of the first discharge quantity in each discharge quantity counting time period to the discharge efficiency at different moments in the discharge process.
Preferably, the method further comprises the steps of:
acquiring a plurality of current values and temperature values of the battery to be calibrated in a second preset time period before the discharge end time of the battery to be calibrated;
obtaining average discharge efficiency of the battery to be calibrated in the second preset time period according to the current values, the temperature values and the preset discharge efficiency comparison table in the second preset time period;
acquiring the current ideal full charge capacity of the battery to be calibrated according to the average discharge efficiency and the rated full charge capacity of the battery to be calibrated in the second preset time period;
calculating a deviation value between the current full charge capacity and the current ideal full charge capacity;
when the deviation value is smaller than or equal to a preset deviation threshold value, updating the full charge capacity value of the battery to be calibrated by utilizing the current full charge capacity;
when the deviation value is larger than the preset deviation threshold value, carrying out average calculation on the current full charge capacity and the current ideal full charge capacity to obtain average full charge capacity, and updating the full charge capacity value of the battery to be calibrated by utilizing the average full charge capacity;
The discharging end time is the time when the battery to be calibrated is detected to be completely discharged;
and the temperature value is an average temperature value obtained by calculation based on temperature sampling values corresponding to a plurality of temperature sampling points on the battery to be calibrated.
It should be noted that, since the discharge efficiency is the ratio of the full discharge capacity to the rated full charge capacity corresponding to different current values and temperature values, the present embodiment obtains the average discharge efficiency in the second preset time period based on the preset discharge efficiency comparison table according to the current values and temperature values in the second preset time period before the discharge end time of the battery to be calibrated, and then obtains the current ideal full charge capacity of the battery to be calibrated according to the product of the average discharge efficiency and the rated full charge capacity.
It should be noted that, the second preset time period may be set according to actual requirements, for example, 10s, 5s, etc., which is not specifically limited herein.
As a preferred solution, the method specifically obtains the preset discharge efficiency comparison table through the following steps S61 to S65:
step S61, controlling the battery for test to discharge from a full charge state under different preset temperature values and preset current values until the battery for test is completely discharged;
Step S62, obtaining the discharge amount of the battery for test under different preset temperature values and preset current values according to the total discharge duration of the battery for test under different preset temperature values and preset current values;
step S63, according to the discharge capacity and the rated full charge capacity under different preset temperature values and preset current values, the undetermined discharge efficiency of the battery for testing under different preset temperature values and preset current values is obtained;
step S64, charging the battery for test to a full charge state, and re-executing the steps S61 to S63 until the number of times of complete discharge of the battery for test reaches a preset number of times threshold, and carrying out average calculation on a plurality of obtained to-be-determined discharge efficiencies of the battery for test under different preset temperature values and preset current values to obtain target discharge efficiency;
step S65, generating the preset discharge efficiency comparison table according to the target discharge efficiencies of the test battery under different preset temperature values and preset current values.
In step S61, under different preset temperature values, the test battery is controlled to discharge from the full charge state in a constant current manner according to different preset current values until the test battery is completely discharged, i.e. a discharge cycle is completed.
In step S62, according to the total discharge duration of the battery for test at different preset temperature values and preset current values, the preset current value is integrated within the total discharge duration, so as to obtain the discharge capacity of the battery for test at different preset temperature values and preset current values.
In step S63, the undetermined discharge efficiency of the test battery at different preset temperature values and preset current values is obtained according to the ratio of the discharge capacity to the rated full charge capacity at different preset temperature values and preset current values.
In step S64, in order to improve the data accuracy, the test battery is recharged to a full charge state, and steps S61 to S63 are re-executed until the number of complete discharge of the test battery reaches a preset number of times threshold, for example, 3 charge-discharge cycles have passed, and then the obtained several pending discharge efficiencies at different preset temperature values and preset current values are averaged to obtain the target discharge efficiency.
Illustratively, the discharge efficiency lookup table is shown in table 1 below:
table 1 discharge efficiency comparison table
In Table 1, the unit of current is mA and the unit of temperature is ℃. In the test process, the more the set current value and the temperature value are, the more detailed the finally obtained discharge efficiency comparison table is, and the higher the data accuracy is.
Preferably, the method further comprises the steps of:
in the discharging process, when detecting that the current moment is any one of the discharging quantity counting moments, obtaining a remaining capacity value of the battery to be calibrated at the current moment according to the remaining capacity value of the battery to be calibrated at the previous moment and the discharging quantity in a discharging quantity counting time period corresponding to the current moment, so as to update the remaining capacity value of the battery to be calibrated by using the remaining capacity value at the current moment;
when the current moment is the first discharge quantity counting moment, the moment before the current moment is the discharge initial moment, the residual capacity value of the battery to be calibrated at the moment before the current moment is the initial residual capacity value, and the discharge quantity counting time period corresponding to the current moment is the time period between the discharge initial moment and the current moment;
when the current moment is not the first discharge quantity counting moment, the moment before the current moment is the previous discharge quantity counting moment, the residual capacity value of the battery to be calibrated at the moment before the current moment is the residual capacity value of the battery to be calibrated at the previous discharge quantity counting moment, and the discharge quantity counting time period corresponding to the current moment is the time period between the previous discharge quantity counting moment and the current moment.
It should be noted that, in this embodiment, by introducing the discharge efficiency of the battery to be calibrated at different current values and temperature values in the calculation process of the remaining capacity value at each discharge amount statistics time, it is able to ensure that the remaining capacity value of the battery to be calibrated will not be suddenly changed due to the environmental temperature change.
For example, assuming that the full charge capacity of a certain battery is 1000mAh in an ideal state, the actual available capacity becomes 800mAh under the influence of the ambient temperature after entering a low-temperature environment, if the integration is performed only according to the current discharge current value according to the prior art as mentioned in the background art, the remaining capacity value of the battery may occur in a sudden change due to the actual available capacity decrease in the late stage. If the discharge efficiency of the battery under different current values and temperature values is introduced, the change trend of the residual capacity value in the whole discharge process is smoother, and abrupt change is avoided. Further, if the surrounding environment is restored from the low temperature environment to the ideal room temperature environment, since the discharge efficiency is introduced in the calculation process of the full charge capacity, the updated full charge capacity is less affected by the low temperature, and at this time, the actual available capacity is restored to 1000mAh, so that the change trend of the residual capacity value in the whole discharge process remains smooth.
Preferably, the method further comprises the steps of:
when the deviation value is smaller than or equal to a preset deviation threshold value, obtaining the current battery health of the battery to be calibrated according to the ratio of the current full charge capacity to the rated full charge capacity;
when the deviation value is larger than the preset deviation threshold value, obtaining the current battery health degree of the battery to be calibrated according to the ratio of the average full charge capacity to the rated full charge capacity;
and updating the battery health of the battery to be calibrated by utilizing the current battery health.
Referring to fig. 2, a second aspect of the embodiment of the present invention provides a battery capacity calibration apparatus, including:
the initial discharge amount obtaining module 203201 is configured to obtain an initial residual capacity value of the battery to be calibrated at a current time when the battery to be calibrated is detected to be discharged, and determine an initial discharge amount according to the initial residual capacity value and a current full charge capacity;
the discharging efficiency obtaining module 202 is configured to obtain current values and temperature values of the battery to be calibrated at different moments in the discharging process according to a preset discharging amount statistics time interval, and obtain discharging efficiencies of the battery to be calibrated at different moments in the discharging process according to the current values, the temperature values and a preset discharging efficiency comparison table; the discharge efficiency is the ratio of the full discharge capacity corresponding to different current values and temperature values to the preset rated full charge capacity;
A discharge amount obtaining module 203, configured to obtain a discharge amount of the battery to be calibrated in each discharge amount statistics time period according to the current values, the discharge efficiencies, and the discharge amount statistics time intervals at different moments in the discharge process;
and the full charge capacity calibration module 204 is configured to obtain, when it is detected that the battery to be calibrated is completely discharged, a total discharge capacity of the battery to be calibrated in the discharge process according to the discharge capacity of the battery to be calibrated in each discharge capacity statistical time period, and obtain, according to the total discharge capacity and the initial discharge capacity, a current full charge capacity of the battery to be calibrated, so as to update a full charge capacity value of the battery to be calibrated by using the current full charge capacity.
As a preferred solution, the discharging efficiency obtaining module 202 is configured to obtain, according to a preset discharging amount statistical time interval, current values and temperature values of the battery to be calibrated at different moments in a discharging process, and specifically includes:
determining a plurality of discharge quantity statistical moments in the discharge process according to the discharge initial moment of the battery to be calibrated and the discharge quantity statistical time interval;
in the discharging process, when the current moment is detected to be any discharge quantity statistical moment, acquiring a plurality of current values and temperature values of the battery to be calibrated in a plurality of first preset time periods before the current moment;
The initial discharge time is the time when the battery to be calibrated is detected to discharge;
and the temperature value is an average temperature value obtained by calculation based on temperature sampling values corresponding to a plurality of temperature sampling points on the battery to be calibrated.
As a preferred solution, the discharging efficiency obtaining module 202 is configured to obtain the discharging efficiencies of the battery to be calibrated at different moments in the discharging process according to the current value, the temperature value and a preset discharging efficiency comparison table, and specifically includes:
according to the current values, the temperature values and the preset discharge efficiency comparison tables in a plurality of first preset time periods before the discharge amount statistics time, average discharge efficiencies of the batteries to be calibrated in the first preset time periods before the discharge amount statistics time are obtained, and the minimum values in the average discharge efficiencies in the plurality of first preset time periods before the discharge amount statistics time are respectively used as the discharge efficiencies of the batteries to be calibrated at different time points in the discharge process.
As a preferred solution, the discharge amount obtaining module 203 is configured to obtain the discharge amount of the battery to be calibrated in each discharge amount statistical time period according to the current values, the discharge efficiencies and the discharge amount statistical time intervals at different moments in the discharge process, and specifically includes:
Obtaining a first discharge capacity of the battery to be calibrated in each discharge capacity statistical time period according to products of the current values and the discharge capacity statistical time intervals at different moments in the discharge process;
and obtaining the discharge quantity of the battery to be calibrated in each discharge quantity counting time period according to the ratio of the first discharge quantity in each discharge quantity counting time period to the discharge efficiency at different moments in the discharge process.
Preferably, the full charge calibration module 204 is further configured to:
acquiring a plurality of current values and temperature values of the battery to be calibrated in a second preset time period before the discharge end time of the battery to be calibrated;
obtaining average discharge efficiency of the battery to be calibrated in the second preset time period according to the current values, the temperature values and the preset discharge efficiency comparison table in the second preset time period;
acquiring the current ideal full charge capacity of the battery to be calibrated according to the average discharge efficiency and the rated full charge capacity of the battery to be calibrated in the second preset time period;
calculating a deviation value between the current full charge capacity and the current ideal full charge capacity;
When the deviation value is smaller than or equal to a preset deviation threshold value, updating the full charge capacity value of the battery to be calibrated by utilizing the current full charge capacity;
when the deviation value is larger than the preset deviation threshold value, carrying out average calculation on the current full charge capacity and the current ideal full charge capacity to obtain average full charge capacity, and updating the full charge capacity value of the battery to be calibrated by utilizing the average full charge capacity;
the discharging end time is the time when the battery to be calibrated is detected to be completely discharged;
and the temperature value is an average temperature value obtained by calculation based on temperature sampling values corresponding to a plurality of temperature sampling points on the battery to be calibrated.
The device further comprises a discharge efficiency comparison table generation module for executing the following steps S61 to S65:
step S61, controlling the battery for test to discharge from a full charge state under different preset temperature values and preset current values until the battery for test is completely discharged;
step S62, obtaining the discharge amount of the battery for test under different preset temperature values and preset current values according to the total discharge duration of the battery for test under different preset temperature values and preset current values;
Step S63, according to the discharge capacity and the rated full charge capacity under different preset temperature values and preset current values, the undetermined discharge efficiency of the battery for testing under different preset temperature values and preset current values is obtained;
step S64, charging the battery for test to a full charge state, and re-executing the steps S61 to S63 until the number of times of complete discharge of the battery for test reaches a preset number of times threshold, and carrying out average calculation on a plurality of obtained to-be-determined discharge efficiencies of the battery for test under different preset temperature values and preset current values to obtain target discharge efficiency;
step S65, generating the preset discharge efficiency comparison table according to the target discharge efficiencies of the test battery under different preset temperature values and preset current values.
Preferably, the device further comprises a residual capacity value calibration module for:
in the discharging process, when detecting that the current moment is any one of the discharging quantity counting moments, obtaining a remaining capacity value of the battery to be calibrated at the current moment according to the remaining capacity value of the battery to be calibrated at the previous moment and the discharging quantity in a discharging quantity counting time period corresponding to the current moment, so as to update the remaining capacity value of the battery to be calibrated by using the remaining capacity value at the current moment;
When the current moment is the first discharge quantity counting moment, the moment before the current moment is the discharge initial moment, the residual capacity value of the battery to be calibrated at the moment before the current moment is the initial residual capacity value, and the discharge quantity counting time period corresponding to the current moment is the time period between the discharge initial moment and the current moment;
when the current moment is not the first discharge quantity counting moment, the moment before the current moment is the previous discharge quantity counting moment, the residual capacity value of the battery to be calibrated at the moment before the current moment is the residual capacity value of the battery to be calibrated at the previous discharge quantity counting moment, and the discharge quantity counting time period corresponding to the current moment is the time period between the previous discharge quantity counting moment and the current moment.
Preferably, the apparatus further comprises a battery health calibration module for:
when the deviation value is smaller than or equal to a preset deviation threshold value, obtaining the current battery health of the battery to be calibrated according to the ratio of the current full charge capacity to the rated full charge capacity;
when the deviation value is larger than the preset deviation threshold value, obtaining the current battery health degree of the battery to be calibrated according to the ratio of the average full charge capacity to the rated full charge capacity;
And updating the battery health of the battery to be calibrated by utilizing the current battery health.
It should be noted that, the battery capacity calibration device provided by the embodiment of the present invention can implement all the processes of the battery capacity calibration method described in any of the foregoing embodiments, and the functions and the implemented technical effects of each module in the device are respectively the same as those of the battery capacity calibration method described in the foregoing embodiments, and are not repeated herein.
A third aspect of the embodiments of the present invention provides a terminal device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the battery capacity calibration method according to any of the embodiments of the first aspect when executing the computer program.
The terminal equipment can be computing equipment such as a desktop computer, a notebook computer, a palm computer, a cloud server and the like. The terminal device may include, but is not limited to, a processor, a memory. The terminal device may also include input and output devices, network access devices, buses, and the like.
The processor may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application Specific Integrated Circuit, ASIC), field programmable gate arrays (Field-Prog rammable Gate Array, FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or the like. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, which is a control center of the terminal device, and which connects various parts of the entire terminal device using various interfaces and lines.
The memory may be used to store the computer program and/or module, and the processor may implement various functions of the terminal device by running or executing the computer program and/or module stored in the memory and invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program (such as a sound playing function, an image playing function, etc.) required for at least one function, and the like; the storage data area may store data (such as audio data, phonebook, etc.) created according to the use of the handset, etc. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, smart Media Card (SMC), secure Digital (SD) Card, flash Card (Flash Card), at least one disk storage device, flash memory device, or other volatile solid-state storage device.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (10)
1. A battery capacity calibration method, comprising the steps of:
when the discharge of the battery to be calibrated is detected, acquiring an initial residual capacity value of the battery to be calibrated at the current moment, and determining an initial discharge capacity according to the initial residual capacity value and the current full charge capacity;
according to a preset discharge quantity statistical time interval, current values and temperature values of the battery to be calibrated at different moments in the discharge process are obtained, and according to the current values, the temperature values and a preset discharge efficiency comparison table, the discharge efficiency of the battery to be calibrated at different moments in the discharge process is obtained; the discharge efficiency is the ratio of the full discharge capacity corresponding to different current values and temperature values to the preset rated full charge capacity;
according to the current values, the discharge efficiency and the discharge quantity statistical time intervals at different moments in the discharge process, obtaining the discharge quantity of the battery to be calibrated in each discharge quantity statistical time period;
when the battery to be calibrated is detected to be completely discharged, the total discharge capacity of the battery to be calibrated in the discharging process is obtained according to the discharge capacity of the battery to be calibrated in each discharge capacity statistical time period, and the current full charge capacity of the battery to be calibrated is obtained according to the total discharge capacity and the initial discharge capacity, so that the full charge capacity value of the battery to be calibrated is updated by utilizing the current full charge capacity.
2. The method for calibrating battery capacity according to claim 1, wherein the step of obtaining the current value and the temperature value of the battery to be calibrated at different time points in the discharging process according to the preset discharge amount statistical time interval specifically comprises the following steps:
determining a plurality of discharge quantity statistical moments in the discharge process according to the discharge initial moment of the battery to be calibrated and the discharge quantity statistical time interval;
in the discharging process, when the current moment is detected to be any discharge quantity statistical moment, acquiring a plurality of current values and temperature values of the battery to be calibrated in a plurality of first preset time periods before the current moment;
the initial discharge time is the time when the battery to be calibrated is detected to discharge;
and the temperature value is an average temperature value obtained by calculation based on temperature sampling values corresponding to a plurality of temperature sampling points on the battery to be calibrated.
3. The method for calibrating battery capacity according to claim 2, wherein the step of obtaining the discharge efficiencies of the battery to be calibrated at different times in the discharge process according to the current value, the temperature value and a preset discharge efficiency comparison table comprises the following steps:
According to the current values, the temperature values and the preset discharge efficiency comparison tables in a plurality of first preset time periods before the discharge amount statistics time, average discharge efficiencies of the batteries to be calibrated in the first preset time periods before the discharge amount statistics time are obtained, and the minimum values in the average discharge efficiencies in the plurality of first preset time periods before the discharge amount statistics time are respectively used as the discharge efficiencies of the batteries to be calibrated at different time points in the discharge process.
4. The method for calibrating battery capacity according to claim 2, wherein said obtaining the discharge amount of the battery to be calibrated in each discharge amount statistical period based on the current value, the discharge efficiency and the discharge amount statistical time interval at different times during the discharge process specifically comprises the steps of:
obtaining a first discharge capacity of the battery to be calibrated in each discharge capacity statistical time period according to products of the current values and the discharge capacity statistical time intervals at different moments in the discharge process;
and obtaining the discharge quantity of the battery to be calibrated in each discharge quantity counting time period according to the ratio of the first discharge quantity in each discharge quantity counting time period to the discharge efficiency at different moments in the discharge process.
5. The battery capacity calibration method of claim 1, further comprising the steps of:
acquiring a plurality of current values and temperature values of the battery to be calibrated in a second preset time period before the discharge end time of the battery to be calibrated;
obtaining average discharge efficiency of the battery to be calibrated in the second preset time period according to the current values, the temperature values and the preset discharge efficiency comparison table in the second preset time period;
acquiring the current ideal full charge capacity of the battery to be calibrated according to the average discharge efficiency and the rated full charge capacity of the battery to be calibrated in the second preset time period;
calculating a deviation value between the current full charge capacity and the current ideal full charge capacity;
when the deviation value is smaller than or equal to a preset deviation threshold value, updating the full charge capacity value of the battery to be calibrated by utilizing the current full charge capacity;
when the deviation value is larger than the preset deviation threshold value, carrying out average calculation on the current full charge capacity and the current ideal full charge capacity to obtain average full charge capacity, and updating the full charge capacity value of the battery to be calibrated by utilizing the average full charge capacity;
The discharging end time is the time when the battery to be calibrated is detected to be completely discharged;
and the temperature value is an average temperature value obtained by calculation based on temperature sampling values corresponding to a plurality of temperature sampling points on the battery to be calibrated.
6. The battery capacity calibration method according to claim 1, wherein the method specifically obtains the preset discharge efficiency map by steps S61 to S65 as follows:
step S61, controlling the battery for test to discharge from a full charge state under different preset temperature values and preset current values until the battery for test is completely discharged;
step S62, obtaining the discharge amount of the battery for test under different preset temperature values and preset current values according to the total discharge duration of the battery for test under different preset temperature values and preset current values;
step S63, according to the discharge capacity and the rated full charge capacity under different preset temperature values and preset current values, the undetermined discharge efficiency of the battery for testing under different preset temperature values and preset current values is obtained;
step S64, charging the battery for test to a full charge state, and re-executing the steps S61 to S63 until the number of times of complete discharge of the battery for test reaches a preset number of times threshold, and carrying out average calculation on a plurality of obtained to-be-determined discharge efficiencies of the battery for test under different preset temperature values and preset current values to obtain target discharge efficiency;
Step S65, generating the preset discharge efficiency comparison table according to the target discharge efficiencies of the test battery under different preset temperature values and preset current values.
7. The battery capacity calibration method of claim 4, further comprising the steps of:
in the discharging process, when detecting that the current moment is any one of the discharging quantity counting moments, obtaining a remaining capacity value of the battery to be calibrated at the current moment according to the remaining capacity value of the battery to be calibrated at the previous moment and the discharging quantity in a discharging quantity counting time period corresponding to the current moment, so as to update the remaining capacity value of the battery to be calibrated by using the remaining capacity value at the current moment;
when the current moment is the first discharge quantity counting moment, the moment before the current moment is the discharge initial moment, the residual capacity value of the battery to be calibrated at the moment before the current moment is the initial residual capacity value, and the discharge quantity counting time period corresponding to the current moment is the time period between the discharge initial moment and the current moment;
when the current moment is not the first discharge quantity counting moment, the moment before the current moment is the previous discharge quantity counting moment, the residual capacity value of the battery to be calibrated at the moment before the current moment is the residual capacity value of the battery to be calibrated at the previous discharge quantity counting moment, and the discharge quantity counting time period corresponding to the current moment is the time period between the previous discharge quantity counting moment and the current moment.
8. The battery capacity calibration method of claim 5, further comprising the steps of:
when the deviation value is smaller than or equal to a preset deviation threshold value, obtaining the current battery health of the battery to be calibrated according to the ratio of the current full charge capacity to the rated full charge capacity;
when the deviation value is larger than the preset deviation threshold value, obtaining the current battery health degree of the battery to be calibrated according to the ratio of the average full charge capacity to the rated full charge capacity;
and updating the battery health of the battery to be calibrated by utilizing the current battery health.
9. A battery capacity calibration apparatus, comprising:
the initial discharge quantity acquisition module is used for acquiring an initial residual capacity value of the battery to be calibrated at the current moment when the battery to be calibrated is detected to be discharged, and determining an initial discharge quantity according to the initial residual capacity value and the current full charge capacity;
the device comprises a discharge efficiency acquisition module, a calibration module and a calibration module, wherein the discharge efficiency acquisition module is used for acquiring current values and temperature values of the battery to be calibrated at different moments in the discharge process according to a preset discharge quantity statistical time interval, and acquiring the discharge efficiency of the battery to be calibrated at different moments in the discharge process according to the current values, the temperature values and a preset discharge efficiency comparison table; the discharge efficiency is the ratio of the full discharge capacity corresponding to different current values and temperature values to the preset rated full charge capacity;
The discharge quantity acquisition module is used for acquiring the discharge quantity of the battery to be calibrated in each discharge quantity counting time period according to the current values, the discharge efficiency and the discharge quantity counting time interval at different moments in the discharge process;
and the full charge capacity calibration module is used for acquiring the total discharge capacity of the battery to be calibrated in the discharge process according to the discharge capacity of the battery to be calibrated in each discharge capacity statistical time period when the battery to be calibrated is detected to be completely discharged, and acquiring the current full charge capacity of the battery to be calibrated according to the total discharge capacity and the initial discharge capacity so as to update the full charge capacity value of the battery to be calibrated by utilizing the current full charge capacity.
10. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, the processor implementing the battery capacity calibration method according to any one of claims 1 to 8 when executing the computer program.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117471328A (en) * | 2023-12-27 | 2024-01-30 | 高新兴科技集团股份有限公司 | Method, system and terminal equipment for determining capacity of lead-acid battery |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117471328A (en) * | 2023-12-27 | 2024-01-30 | 高新兴科技集团股份有限公司 | Method, system and terminal equipment for determining capacity of lead-acid battery |
| CN117471328B (en) * | 2023-12-27 | 2024-04-12 | 高新兴科技集团股份有限公司 | Method, system and terminal equipment for determining capacity of lead-acid battery |
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