CN111929603A - Battery monomer self-discharge measuring and calculating method and device and computer readable storage medium - Google Patents
Battery monomer self-discharge measuring and calculating method and device and computer readable storage medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 62
- 239000000178 monomer Substances 0.000 title claims abstract description 47
- 238000003860 storage Methods 0.000 title claims abstract description 20
- 230000003068 static effect Effects 0.000 claims abstract description 109
- 238000011088 calibration curve Methods 0.000 claims abstract description 35
- 238000004590 computer program Methods 0.000 claims description 24
- 238000001514 detection method Methods 0.000 claims description 10
- 230000010287 polarization Effects 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 7
- 238000004458 analytical method Methods 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000005611 electricity Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 238000012360 testing method Methods 0.000 abstract description 29
- 239000000126 substance Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 10
- 230000006870 function Effects 0.000 description 8
- 238000012545 processing Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 229910001416 lithium ion Inorganic materials 0.000 description 3
- 230000003287 optical effect Effects 0.000 description 2
- 230000000284 resting effect Effects 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052987 metal hydride Inorganic materials 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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Abstract
The application relates to a method and a device for measuring and calculating self-discharge of a battery monomer and a computer-readable storage medium, wherein the method comprises the steps of obtaining a calibration curve of the relation between the static voltage of the battery monomer and the charge state of the battery monomer; acquiring a first static voltage when a single battery reaches thermal balance, and acquiring a second static voltage of the single battery after reaching thermal balance and standing at constant temperature within a first preset temperature range for a first standing time; according to the calibration curve, acquiring a first charge state corresponding to the first static voltage and acquiring a second charge state corresponding to the second static voltage; and acquiring the self-discharge rate of the single battery reaching the target days according to the first charge state, the second charge state, the first standing time and the target days of the single battery. The method can directly represent the self-discharge level, does not consume a large amount of charge and discharge test resources to carry out a capacity test, and can also carry out comparison of the self-discharge levels of batteries of different chemical systems.
Description
Technical Field
The present disclosure relates to the field of battery management technologies, and in particular, to a method and an apparatus for measuring and calculating self-discharge of a battery cell, and a computer-readable storage medium.
Background
With the development of the electric automobile industry, the application of lithium ion batteries to electric automobiles has become a trend. Lithium ion batteries, when not connected to an external circuit, suffer from a loss of battery capacity due to internal spontaneous reactions, commonly referred to as self-discharge. Expressed as the percentage of capacity lost annually, monthly or daily. Hundreds of monomers in the battery system are integrated in a series connection and connection mode, and the self-discharge consistency of the single battery becomes one of important parameters influencing the performance of the battery system.
In the self-discharge testing method adopted in the prior art, a k value testing method, namely a pressure difference time change rate or a residual capacity testing method is adopted to characterize the self-discharge rate of the battery, wherein the residual capacity testing method is a testing method for testing the charge retention rate specified by QC/T743-2006 'lithium ion storage battery for electric automobile', namely the capacity difference time change rate before and after storage.
The qualified product specification set by the k value testing method can only be judged according to the specific SOC of the battery, and when the SOC of the battery changes, the qualified product specification needs to be reset due to the slope change of a voltage curve of the battery, namely the self-discharge k value of the battery changes along with the state of charge of the battery. The k-value test method is an indirect characterization of physical quantities characterizing the self-discharge of the battery.
The residual capacity test method needs to charge and discharge the battery before and after the test to obtain the battery capacity for difference value calculation, the method needs test time and charge and discharge equipment to test the capacity, and when a large number of batteries need to be tested and self-discharged, a large amount of time and test resources are consumed.
Disclosure of Invention
The embodiment of the application provides a method and a device for measuring and calculating self-discharge of a battery monomer and application of the method and the device, and aims to solve the problems that in the related technology, test time is needed, capacity of charging and discharging equipment is tested, and when a large number of batteries need to be evaluated for self-discharge, a large amount of test time and test resources are consumed.
On one hand, the embodiment of the application provides a method for measuring and calculating self-discharge of a battery cell, which comprises the following steps:
acquiring a calibration curve of the relation between the static voltage of a single battery and the charge state of the single battery;
acquiring a first static voltage when a single battery reaches thermal balance, and acquiring a second static voltage of the single battery after reaching thermal balance and standing at constant temperature within a first preset temperature range for a first standing time;
according to the calibration curve, acquiring a first charge state corresponding to the first static voltage and acquiring a second charge state corresponding to the second static voltage;
and acquiring the self-discharge rate of the single battery reaching the target days according to the first charge state, the second charge state, the first standing time and the target days of the single battery.
In some embodiments, the step of obtaining a calibration curve of a relationship between a static voltage of a battery cell and a state of charge of the battery cell includes the following steps:
controlling the battery monomer to be tested to be fully charged, and acquiring full-electricity static voltage and full-charge electricity states of the battery monomer when the battery monomer is kept standing at constant temperature within a second preset temperature range for a second standing time;
controlling the fully charged battery monomer to discharge, and repeatedly acquiring the discharge static voltage and the discharge charge state of the battery monomer when the battery monomer is discharged for a preset capacity gradient value every time and is kept standing at a constant temperature within a third preset temperature range for a third standing time until the electric quantity of the battery monomer is discharged, wherein the range of the preset capacity gradient value is 0.01-10% of the electric quantity value of the battery monomer when the battery monomer is fully charged;
and obtaining a calibration curve of the relation between the static voltage of the single battery and the charge state of the single battery according to the obtained full-electricity static voltage, the full-charge state, the discharge static voltage and the discharge charge state.
In some embodiments, the first standing time is in a range of 0.1 to 30 days, and the first preset temperature is in a range of-30 to 60 ℃;
the second preset temperature range is-30-60 ℃, and the second standing time range is 2-12 hours;
the third preset temperature range is-30-60 ℃, and the third standing time range is 2-12 hours.
In some embodiments, the step of obtaining a calibration curve of a relationship between a static voltage of a single battery and a state of charge of the single battery according to the obtained full-charge static voltage, the full-charge state, the discharge static voltage, and the discharge state of charge includes the following steps:
according to the obtained full-electricity static voltage, the full-charge state, the discharge static voltage and the discharge charge state, obtaining an unobtainable interpolation static voltage and an interpolation charge state by adopting an interpolation method;
and obtaining a calibration curve of the relation between the static voltage of the single battery and the charge state of the single battery according to the full-electricity static voltage, the full-charge state, the discharge static voltage, the discharge charge state, the interpolation static voltage and the interpolation charge state.
In some embodiments, before the step of obtaining the first static voltage when the battery cell reaches thermal equilibrium and obtaining the second static voltage after the battery cell reaches thermal equilibrium and is kept standing at a constant temperature within a first preset temperature range for a first standing time, the method includes the following steps:
and controlling the tested battery monomer to stand for a fourth standing time at a constant temperature within a fourth preset temperature range, and eliminating voltage polarization caused by the preorder procedure of the battery monomer.
In some embodiments, the fourth resting time ranges from 0 to 3 days and the fourth preset temperature range is from 25 to 60 ℃.
In some embodiments, after the step of "controlling the measured battery cell to stand at a constant temperature within a fourth preset temperature range for a fourth standing time to eliminate voltage polarization caused by a preamble procedure of the battery cell", the method includes the following steps:
detecting the thermal state of the battery cell;
when the standing temperature of the single battery in the first standing time stage is detected to be equal to the standing temperature of the single battery in the fourth standing time stage, judging that the single battery is in a thermal balance state;
when the standing temperature of the single battery in the fourth standing time stage is detected to be different from the standing temperature of the single battery in the first standing time stage, judging that the single battery is in a non-thermal equilibrium state;
and when the single battery is in a non-thermal equilibrium state, controlling the single battery to be in a standing temperature until the single battery reaches a thermal equilibrium state.
In a second aspect, an embodiment of the present application provides a battery cell self-discharge measurement and calculation device, including:
the first acquisition module is used for acquiring a full-charge static voltage and a full-charge state of the single battery when the single battery is fully charged and acquiring a discharge static voltage and a discharge charge state of the single battery at each moment of discharging a capacitance gradient value when the single battery is discharged;
the calibration module is used for acquiring full-charge static voltage, full-charge state, discharge static voltage and discharge charge state of the single battery, and acquiring a calibration curve of the static voltage to the charge state according to the calibration relation of the static voltage to the charge state;
the second acquisition module is used for acquiring a first static voltage when the single battery reaches thermal balance, acquiring a second static voltage when the single battery is kept at a constant temperature within a first preset temperature range for a first standing time after reaching the thermal balance, acquiring a first charge state corresponding to the first static voltage, and acquiring a second charge state corresponding to the second static voltage;
and the self-discharge rate analysis module is used for acquiring the self-discharge rate of the single battery reaching the target days according to the first charge state, the second charge state, the first standing time and the target days of the single battery.
In some embodiments, further comprising:
the temperature detection module is used for detecting the cell temperature and the environment temperature of the single battery;
and the detection judgment module is used for comparing the cell temperature of the single battery with the ambient temperature and judging whether the single battery reaches a thermal balance state.
In a third aspect, the present application further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when being executed by a processor, the computer program implements all the method steps of the battery cell self-discharge estimation method described above.
The beneficial effect that technical scheme that this application provided brought includes:
the embodiment of the invention provides a method and a device for measuring and calculating self-discharge of a battery, wherein the method can directly represent the self-discharge level of a battery monomer and does not consume a large amount of charge and discharge test resources to carry out capacity test;
the embodiment of the invention provides a method for measuring and calculating the self-discharge of a battery, which can be realized by comparing the self-discharge levels of batteries of different chemical systems;
according to the method for measuring and calculating the self-discharge of the battery, after the calibration curve is established on the battery designed in the same manner for the first time, only the voltage of the battery needs to be tested subsequently, and a large number of charging and discharging test resources do not need to be consumed for carrying out capacity test.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for measuring and calculating self-discharge of a battery cell according to an embodiment of the present disclosure;
FIG. 2 is a calibration curve provided in accordance with an embodiment of the present application;
FIG. 3 is a schematic diagram of interpolation applied to a calibration curve according to an embodiment of the present disclosure;
fig. 4 is a functional block diagram of an apparatus according to an embodiment of the present disclosure.
In the figure: 100. a first acquisition module; 200. a calibration module; 300. a second acquisition module; 400. a self-discharge rate analysis module; 500. a temperature detection module; 600. and a detection judgment module.
Detailed Description
Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with the specific embodiments, it will be understood that they are not intended to limit the invention to the embodiments described. On the contrary, it is intended to cover alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims. It should be noted that the method steps described herein may be implemented by any functional block or functional arrangement, and that any functional block or functional arrangement may be implemented as a physical entity or a logical entity, or a combination of both.
In order that those skilled in the art will better understand the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
The embodiment of the application provides a method and a device for measuring and calculating self-discharge of a battery monomer and application of the method and the device, and aims to solve the problems that in the related technology, test time is needed, capacity of charging and discharging equipment is tested, and when a large number of batteries need to be evaluated for self-discharge, a large amount of test time and test resources are consumed.
In one aspect, referring to fig. 1, an embodiment of the present application provides a method for measuring and calculating self-discharge of a battery cell, including the following steps:
obtaining a calibration curve of the relation between the static voltage OCV _ B of the single battery and the state of charge SOC _ B of the single battery, which is shown in FIG. 2;
acquiring a first static voltage when a single battery reaches thermal balance, and acquiring a second static voltage of the single battery after reaching thermal balance and standing at constant temperature within a first preset temperature range for a first standing time;
according to the calibration curve, acquiring a first charge state corresponding to the first static voltage and acquiring a second charge state corresponding to the second static voltage;
and acquiring the self-discharge rate of the single battery reaching the target days according to the first charge state, the second charge state, the first standing time and the target days of the single battery.
In one embodiment, a calibration curve of OCV _ B (static voltage) versus SOC _ B (state of charge) is established; (2) standing at the temperature T1 for T1 days, eliminating the polarization of the battery voltage, and recording the battery voltage OCV 1; (3) recording the battery voltage OCV2 at a temperature T2 standing time of T2 days; (4) referring to FIG. 2, based on the calibration curve of step 1, OCV1 pairs are obtainedThe SOC1 is obtained, and the SOC2 corresponding to the OCV2 is obtained; the OCV1 value is known to be 3.7485V, and the state of charge SOC1 value corresponding to the static voltage value obtained by interpolation on the calibration curve is 58.7%. The OCV2 value is known to be 3.7178V, the corresponding SOC2 value obtained on the calibration curve by an interpolation method is 55 percent (5), and the n-day self-discharge rate beta of the battery is calculatedT2＝(SOC1-SOC2)*n/t2。
The embodiment of the invention provides a method, a device and an application for measuring and calculating self-discharge of a battery, wherein the method can directly represent the self-discharge level of a battery monomer and does not consume a large amount of charge and discharge test resources to carry out capacity test;
the embodiment of the invention provides a method for measuring and calculating the self-discharge of a battery, which can be realized by comparing the self-discharge levels of batteries of different chemical systems;
according to the method for measuring and calculating the self-discharge of the battery, after the calibration curve is established on the battery designed in the same manner for the first time, only the voltage of the battery needs to be tested subsequently, and a large number of charging and discharging test resources do not need to be consumed for carrying out capacity test.
Based on the same inventive concept, the embodiment of the application also provides the application of the method for measuring and calculating the self-discharge of the battery monomer, which is used for measuring and calculating the self-discharge of the battery monomer of a lithium battery, a lead-acid battery and a nickel-metal hydride battery and has wide application range.
In some embodiments, the step of obtaining a calibration curve of a relationship between a static voltage of a battery cell and a state of charge of the battery cell includes the following steps:
controlling the battery monomer to be tested to be fully charged, and acquiring full-electricity static voltage and full-charge electricity states of the battery monomer when the battery monomer is kept standing at constant temperature within a second preset temperature range for a second standing time;
controlling the fully charged battery monomer to discharge, and repeatedly acquiring the discharge static voltage and the discharge charge state of the battery monomer when the battery monomer is discharged for a preset capacity gradient value every time and is kept standing at a constant temperature within a third preset temperature range for a third standing time until the electric quantity of the battery monomer is discharged, wherein the range of the preset capacity gradient value is 0.01-10% of the electric quantity value of the battery monomer when the battery monomer is fully charged;
and obtaining a calibration curve of the relation between the static voltage of the single battery and the charge state of the single battery according to the obtained full-electricity static voltage, the full-charge state, the discharge static voltage and the discharge charge state.
As described above, according to the present application, the full charge and self-discharge operations of the battery cell are performed under room temperature conditions.
The calibration curve obtained by the method is calibrated, so that the relation curve of the state of charge corresponding to different static voltages in the self-discharge process of the single battery is obtained, when the self-discharge of the single battery is required to be measured and calculated subsequently, the static voltage value of the single battery is only required to be measured and calculated, the self-discharge rate of the single battery can be measured and calculated by combining the calibration curve, and the capacity of the single battery is not required to be tested by consuming a large amount of charge and discharge resources.
In some embodiments, the first standing time is in a range of 0.1 to 30 days, and the first preset temperature is in a range of-30 to 60 ℃; the second preset temperature range is-30-60 ℃, and the second standing time range is 2-12 hours; the third preset temperature range is-30-60 ℃, and the third standing time range is 2-12 hours.
In some embodiments, the step of obtaining a calibration curve of a relationship between a static voltage of a single battery and a state of charge of the single battery according to the obtained full-charge static voltage, the full-charge state, the discharge static voltage, and the discharge state of charge specifically includes the following steps:
according to the obtained full-electricity static voltage, the full-charge state, the discharge static voltage and the discharge charge state, obtaining an unobtainable interpolation static voltage and an interpolation charge state by adopting an interpolation method;
and obtaining a calibration curve of the relation between the static voltage of the single battery and the charge state of the single battery according to the full-electricity static voltage, the full-charge state, the discharge static voltage, the discharge charge state, the interpolation static voltage and the interpolation charge state.
In one embodiment, the state of charge of the untested traces in the calibration curve is supplemented by interpolation, specifically, as shown in fig. 3, origin software is used at 20 points in the calibration curve, and the software automatically calculates the interpolation based on the curve trend.
In some embodiments, the step of obtaining the first static voltage when the single battery reaches thermal equilibrium and obtaining the second static voltage after the single battery reaches thermal equilibrium and before the step of standing the single battery at a constant temperature within a first preset temperature range for a first standing time includes the following steps:
and controlling the tested battery monomer to stand for a fourth standing time at a constant temperature within a fourth preset temperature range, eliminating voltage polarization caused by a preorder procedure of the battery monomer, and preventing the voltage polarization of the battery monomer from influencing the testing accuracy of the static voltage and the charge state of the battery monomer in the testing stage.
In some embodiments, the fourth resting time ranges from 0 to 3 days and the fourth preset temperature range is from 25 to 60 ℃.
In some embodiments, the step of controlling the constant temperature of the measured battery cell within the fourth preset temperature range for a fourth standing time to eliminate the voltage polarization caused by the preamble procedure of the battery cell includes the following steps:
detecting the thermal state of the battery cell;
when the standing temperature of the single battery in the first standing time stage is detected to be equal to the standing temperature of the single battery in the fourth standing time stage, judging that the single battery is in a thermal balance state;
when the standing temperature of the single battery in the fourth standing time stage is detected to be different from the standing temperature of the single battery in the first standing time stage, judging that the single battery is in a non-thermal equilibrium state;
and when the single battery is in a non-thermal equilibrium state, controlling the single battery to be in a standing temperature until the single battery reaches a thermal equilibrium state.
In a second aspect, referring to fig. 4, an embodiment of the present application provides a battery cell self-discharge measuring and calculating device, including:
the first obtaining module 100 is configured to obtain a full-charge static voltage and a full-charge state of the battery cell during full charge, and obtain a discharge static voltage and a discharge charge state of the battery cell at each moment of discharging a capacitance gradient value during discharge;
the calibration module 200 is configured to obtain a full-charge static voltage, a full-charge state, a discharge static voltage, and a discharge state of charge of a battery cell, and obtain a calibration curve of the static voltage to the state of charge according to a calibration relationship of the static voltage to the state of charge;
the second obtaining module 300 is configured to obtain a first static voltage when the battery cell reaches thermal balance, obtain a second static voltage when the battery cell reaches thermal balance and then stands at a constant temperature within a first preset temperature range for a first standing time, obtain a first charge state corresponding to the first static voltage, and obtain a second charge state corresponding to the second static voltage;
and the self-discharge rate analysis module 400 is configured to obtain the self-discharge rate when the battery cell reaches the target number of days according to the first state of charge, the second state of charge, the first standing time, and the target number of days of the battery cell.
In some embodiments, the battery further includes a temperature detection module 500 and a detection and judgment module 600, where the temperature detection module 500 is configured to detect a cell temperature and an ambient temperature of a battery cell; the detection and judgment module 600 is configured to compare the core temperature of the battery cell with the ambient temperature, and judge whether the battery cell reaches a thermal equilibrium state.
In a third aspect, the present application further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when being executed by a processor, the computer program implements all the method steps of the battery cell self-discharge estimation method described above.
The present invention can implement all or part of the processes of the above methods, and can also be implemented by using a computer program to instruct related hardware, where the computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above method embodiments can be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
Based on the same inventive concept, the embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements all or part of the method steps of the above method.
Based on the same inventive concept, an embodiment of the present application further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program running on the processor, and the processor executes the computer program to implement all or part of the method steps in the method.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being the control center of the computer device and the various interfaces and lines connecting the various parts of the overall computer device.
The memory may be used to store computer programs and/or modules, and the processor may implement various functions of the computer device by executing or executing the computer programs and/or modules stored in the memory, as well as by 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 required by at least one function (e.g., a sound playing function, an image playing function, etc.); the storage data area may store data (e.g., audio data, video data, etc.) created according to the use of the cellular phone. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, server, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), servers and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for measuring and calculating self-discharge of battery cells is characterized by comprising the following steps:
acquiring a calibration curve of the relation between the static voltage of a single battery and the charge state of the single battery;
acquiring a first static voltage when a single battery reaches thermal balance, and acquiring a second static voltage of the single battery after reaching thermal balance and standing at constant temperature within a first preset temperature range for a first standing time;
according to the calibration curve, acquiring a first charge state corresponding to the first static voltage and acquiring a second charge state corresponding to the second static voltage;
and acquiring the self-discharge rate of the single battery reaching the target days according to the first charge state, the second charge state, the first standing time and the target days of the single battery.
2. The method for measuring and calculating the self-discharge of the battery cell according to claim 1, wherein the step of obtaining the calibration curve of the relation between the static voltage of the battery cell and the state of charge of the battery cell comprises the following steps:
controlling the battery monomer to be tested to be fully charged, and acquiring full-electricity static voltage and full-charge electricity states of the battery monomer when the battery monomer is kept standing at constant temperature within a second preset temperature range for a second standing time;
controlling the fully charged battery monomer to discharge, and repeatedly acquiring the discharge static voltage and the discharge charge state of the battery monomer when the battery monomer is discharged for a preset capacity gradient value every time and is kept standing at a constant temperature within a third preset temperature range for a third standing time until the electric quantity of the battery monomer is discharged, wherein the range of the preset capacity gradient value is 0.01-10% of the electric quantity value of the battery monomer when the battery monomer is fully charged;
and obtaining a calibration curve of the relation between the static voltage of the single battery and the charge state of the single battery according to the obtained full-electricity static voltage, the full-charge state, the discharge static voltage and the discharge charge state.
3. The method for measuring and calculating the self-discharge of the battery cell according to claim 2, wherein the first standing time is in a range of 0.1 to 30 days, and the first preset temperature is in a range of-30 to 60 ℃;
the second preset temperature range is-30-60 ℃, and the second standing time range is 2-12 hours;
the third preset temperature range is-30-60 ℃, and the third standing time range is 2-12 hours.
4. The method for measuring and calculating the self-discharge of the battery cell according to claim 2, wherein the step of obtaining a calibration curve of the relation between the static voltage of the battery cell and the state of charge of the battery cell according to the obtained full-charge static voltage, the full-charge state, the discharge static voltage and the discharge state of charge specifically comprises the following steps:
according to the obtained full-electricity static voltage, the full-charge state, the discharge static voltage and the discharge charge state, obtaining an unobtainable interpolation static voltage and an interpolation charge state by adopting an interpolation method;
and obtaining a calibration curve of the relation between the static voltage of the single battery and the charge state of the single battery according to the full-electricity static voltage, the full-charge state, the discharge static voltage, the discharge charge state, the interpolation static voltage and the interpolation charge state.
5. The method for measuring and calculating the self-discharge of the battery cell as claimed in claim 1, wherein before the step of obtaining the first static voltage when the battery cell reaches the thermal equilibrium and obtaining the second static voltage after the battery cell reaches the thermal equilibrium and is kept at a constant temperature within a first preset temperature range for a first standing time, the method comprises the following steps:
and controlling the tested battery monomer to stand for a fourth standing time at a constant temperature within a fourth preset temperature range, and eliminating voltage polarization caused by the preorder procedure of the battery monomer.
6. The method for measuring and calculating the self-discharge of the battery cell as claimed in claim 5, wherein the fourth standing time is in a range of 0 to 3 days, and the fourth preset temperature is in a range of 25 to 60 ℃.
7. The method for measuring and calculating the self-discharge of the battery cell as claimed in claim 5, wherein the step of controlling the measured battery cell to stand for a fourth standing time at a constant temperature within a fourth preset temperature range and eliminating the voltage polarization caused by the preamble procedure of the battery cell comprises the following steps:
detecting the thermal state of the battery cell;
when the standing temperature of the single battery in the first standing time stage is detected to be equal to the standing temperature of the single battery in the fourth standing time stage, judging that the single battery is in a thermal balance state;
when the standing temperature of the single battery in the fourth standing time stage is detected to be different from the standing temperature of the single battery in the first standing time stage, judging that the single battery is in a non-thermal equilibrium state;
and when the single battery is in a non-thermal equilibrium state, controlling the single battery to be in a standing temperature until the single battery reaches a thermal equilibrium state.
8. A battery cell self-discharge measuring and calculating device is characterized by comprising:
the first acquisition module is used for acquiring a full-charge static voltage and a full-charge state of the single battery when the single battery is fully charged and acquiring a discharge static voltage and a discharge charge state of the single battery at each moment of discharging a capacitance gradient value when the single battery is discharged;
the calibration module is used for acquiring full-charge static voltage, full-charge state, discharge static voltage and discharge charge state of the single battery, and acquiring a calibration curve of the static voltage to the charge state according to the calibration relation of the static voltage to the charge state;
the second acquisition module is used for acquiring a first static voltage when the single battery reaches thermal balance, acquiring a second static voltage when the single battery is kept at a constant temperature within a first preset temperature range for a first standing time after reaching the thermal balance, acquiring a first charge state corresponding to the first static voltage, and acquiring a second charge state corresponding to the second static voltage;
and the self-discharge rate analysis module is used for acquiring the self-discharge rate of the single battery reaching the target days according to the first charge state, the second charge state, the first standing time and the target days of the single battery.
9. The cell self-discharge measurement and calculation device according to claim 8, further comprising:
the temperature detection module is used for detecting the cell temperature and the environment temperature of the single battery;
and the detection judgment module is used for comparing the cell temperature of the single battery with the ambient temperature and judging whether the single battery reaches a thermal balance state.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a processor, carries out all the method steps of the cell self-discharge estimation method according to claims 1 to 7.
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