WO2023016112A1 - 电芯自放电电流检测方法、装置、设备及计算机存储介质 - Google Patents
电芯自放电电流检测方法、装置、设备及计算机存储介质 Download PDFInfo
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- 238000005259 measurement Methods 0.000 description 29
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/10—Measuring sum, difference or ratio
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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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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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
-
- 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
-
- 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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/52—Testing for short-circuits, leakage current or ground faults
Definitions
- the present application relates to the technical field of batteries, and in particular to a battery cell self-discharge current detection method, device, equipment and computer storage medium.
- batteries usually have self-discharge characteristics. For example, when the battery is in an open state, there will still be power loss.
- the self-discharge current of the battery cell can indicate the quality of the battery cell to a certain extent, and the detection of the self-discharge current of the battery cell will help to eliminate the battery cell with poor quality.
- the battery cell is charged by using a constant voltage source, and when the charging current value is stable, the stable current value is determined as the self-discharge current.
- this self-discharge current detection method has a defect of low efficiency.
- Embodiments of the present application provide a method, device, device, and computer storage medium for detecting self-discharge current of a battery cell to solve the problem of low efficiency in detecting the self-discharge current of a battery cell in the prior art.
- the embodiment of the present application provides a method for detecting the self-discharge current of a battery cell, the method comprising:
- the self-discharge current of the battery cell is determined according to the target current at the second moment or the target current within the fourth preset time period after the second moment, and the second Threshold is greater than or equal to 0.
- the embodiment of the present application provides a battery self-discharge current detection device, the device includes:
- the control acquisition module is used to control the constant voltage source to start charging the battery cell at the first moment, and obtain the first rate of change of the target current with time within the first preset time period after the first moment, and the target current is the total charging of the battery cell current;
- the first control module is used to control the constant current source and the constant voltage source to charge the cell when the first rate of change is greater than the first threshold;
- the first acquisition module is used to obtain the second rate of change of the target current over time within the second preset time period after the second moment when the second moment is reached.
- the second moment is to use a constant current source and a constant voltage source pair The moment when the charging time of the battery cell reaches the third preset duration;
- the first determination module is configured to determine the battery cell according to the target current at the second moment or the target current within the fourth preset time period after the second moment when the absolute value of the second rate of change is less than or equal to the second threshold
- the self-discharge current, the first threshold and the second threshold are both greater than or equal to 0.
- an embodiment of the present application provides an electronic device, which includes: a processor and a memory storing computer program instructions;
- the battery self-discharge current detection method as shown in the first aspect is realized.
- an embodiment of the present application provides a computer storage medium, on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the battery self-discharge current detection method as shown in the first aspect is implemented.
- the battery self-discharge current detection method controls the constant voltage source to start charging the battery at the first moment, and obtains the first rate of change of the target current with time within the first preset time period after the first moment.
- the first rate of change is greater than the first threshold, control the constant current source and constant voltage source to charge the battery cell, and use the constant current source and constant voltage source to charge the battery cell for the third preset duration to the second moment , acquiring a second rate of change of the target current over time within a second preset time period after the second moment.
- the self-discharge current of the battery cell is determined according to the target current at the second moment or the target current within a fourth preset time period after the second moment.
- the detection efficiency of the self-discharge current of the cell can be effectively improved.
- the constant current source is added to charge the cell Charging can overcome the influence of factors such as cell polarization on the detection process, and improve the detection accuracy of the self-discharge current of the cell.
- Fig. 1 is a schematic structural diagram of a framework for applying the cell self-discharge current detection method provided by the embodiment of the present application;
- Fig. 2 is a schematic flow chart of a battery self-discharge current detection method provided by an embodiment of the present application
- Fig. 3 is a schematic flow chart of a battery self-discharge current detection method in a specific application example
- FIG. 4 is a schematic structural diagram of a cell self-discharge current detection device provided in an embodiment of the present application.
- FIG. 5 is a schematic structural diagram of an electronic device provided by an embodiment of the present application.
- the embodiments of the present application provide a battery cell self-discharge current detection method, device, equipment and computer storage medium.
- a framework that can realize the method for detecting the self-discharge current of the battery cell provided in the embodiment of the present application is firstly introduced below.
- the framework may include a constant voltage source 11 , a constant current source 12 , a voltage measurement circuit 13 , a current measurement circuit 14 and a processor (not shown in the figure).
- the processor can be electrically connected to components such as the constant voltage source 11 , the constant current source 12 , the voltage measurement circuit 13 and the current measurement circuit 14 , so as to control these components.
- the processor can acquire the data collected by the voltage measurement circuit 13 and the current measurement circuit 14 , or can control the output current of the constant current source 12 and so on.
- the constant current source 12 can output current to charge the battery cell 15 .
- the output current of the constant current source 12 can be adjustable, and the specific adjustment process can be controlled by a processor.
- the constant voltage source 11 can be a direct current (Direct Current, DC) power supply as shown in FIG. 1 .
- the constant voltage source 11 outputs a DC voltage to charge the battery cell 15 .
- the output voltage of the constant voltage source 11 can also be adjustable, so as to charge different types of batteries 15 .
- the adjustment of the output voltage of the constant voltage source 11 may also be controlled by a processor.
- the voltage measurement circuit 13 can be used to measure the voltage across the battery cell 15 .
- the voltage measurement circuit 13 can measure the open circuit voltage of the battery cell 15 .
- the current measurement circuit 14 can be used to measure the total charging current of the battery cell 15 .
- the constant voltage source 11 and the constant current source 12 can be integrally used as a charging power source for the battery cell 15 , and the current measurement circuit 13 can be respectively connected to the charging power source and the battery cell 15 through wires.
- the current measurement circuit 14 can also measure the battery cell 15 accordingly. the total charging current.
- the cell 15 may equivalently include an effective capacitance C, a resistor R1 connected in series with the effective capacitance C, and a resistor R2 connected in parallel with the effective capacitance C. Based on the equivalent structure, it can be seen that even if the battery cell 15 is in an open circuit state, it can discharge based on the circuit formed by the effective capacitance C and the electron R2, and generate a self-discharge current.
- the positive pole of the constant voltage source 11, the positive pole of the constant current source 12, and one end of the current measurement circuit 14 are connected to each other, the other end of the current measurement circuit 14, one end of the voltage measurement circuit 13, and one end of the resistor R1 are connected to each other, and the other end of the resistor R1 , the positive pole of the effective capacitance C and one end of the resistor R2 are connected to each other, the negative pole of the constant voltage source 11, the negative pole of the constant current source 12, the other end of the voltage measurement circuit 13, the negative pole of the effective capacitance C and the other end of the electronic R2 are connected to each other.
- connection structure of the effective capacitance C of the resistor R1 and the resistor R2 can be an equivalent structure of the battery cell 15 , and in practical applications, the battery cell 15 can be connected with other components as a whole.
- the connection relationship of the components in the frame, or the specific composition of the components can be adjusted as required.
- FIG. 2 shows a schematic flowchart of a method for detecting self-discharge current of a cell provided by an embodiment of the present application. As shown in Figure 2, the method includes:
- Step 201 controlling the constant voltage source to start charging the battery cell at the first moment, obtaining the first rate of change of the target current over time within the first preset time period after the first moment, and the target current is the total charging current of the battery cell;
- Step 202 when the first rate of change is greater than the first threshold, control the constant current source and the constant voltage source to charge the cell, and the first threshold is greater than or equal to 0;
- Step 203 when the second moment is reached, obtain the second rate of change of the target current with time within the second preset time period after the second moment, the second moment is charging the battery with a constant current source and a constant voltage source The moment when the time reaches the third preset duration;
- Step 204 when the absolute value of the second rate of change is less than or equal to the second threshold, determine the self-discharge current of the battery cell according to the target current at the second moment or the target current within the fourth preset time period after the second moment , the second threshold is greater than or equal to 0.
- a constant voltage source can be used to charge the battery cell.
- the output voltage of the constant voltage source can be a preset value.
- the output voltage of the constant voltage source can be determined according to the type of the cell. For example, when the cell to be detected for self-discharge current is a cell with a rated output voltage of 1.5V, the output voltage of the constant voltage source may be set to 1.5V.
- the open-circuit voltage of the cell to be detected for self-discharge current may be measured, and the measured open-circuit voltage may be set as the input voltage of the constant voltage source.
- the first moment can be considered as the moment when the battery cell starts to be charged by the constant voltage source.
- the processor in step 201, can control the constant voltage source to start charging the battery cell after receiving a preset instruction, and record the moment when charging starts, that is, the above-mentioned first moment.
- the 5s here may correspond to the above-mentioned first preset duration.
- the first preset duration can be set as required.
- the rate of change of the target current over time can be obtained through differential calculation.
- the target current can be denoted as I
- the rate of change of the target current over time can be denoted as k
- each preset duration can be considered to be selected in seconds.
- the first rate of change may be considered as the rate of change of the target current over time within the first preset time period after the first moment, and the first rate of change may be denoted as k s .
- the target current can be the total charging current of the battery cell, within the first preset time period after the first moment, the battery cell can be charged by a constant voltage source, and the corresponding target current can be considered as It is caused by the potential difference between the constant voltage source and the cell.
- the output voltage of the constant voltage source is usually constant, so the potential difference between the constant voltage source and the cell will change.
- the current measurement circuit can collect the corresponding current value, which can correspond to the target current.
- the change of the potential difference between the constant voltage source and the cell can be reflected in the change of the target current with time.
- step 202 when the first rate of change k s is greater than the first threshold, the constant current source and the constant voltage source may be controlled to charge the battery cell at the same time.
- the first threshold is greater than or equal to 0.
- the first threshold may be equal to zero.
- the output voltage of the cell is theoretically decreasing, so the potential difference between the output voltage of the constant voltage source and the output voltage of the cell will continue to increase. , the target current increases accordingly. Therefore, within the first preset time period after the first moment, the value of k is theoretically greater than 0.
- the first rate of change k s is greater than 0, it can be explained that the self-discharge condition of the battery cell is more in line with the theoretical working state.
- the battery cell may be polarized due to insufficient rest, which will cause the above-mentioned first change rate k s to be less than or equal to 0.
- the subsequent detection process can be performed to reduce the influence of interference factors such as polarization phenomena on the measurement results.
- the first threshold may also be set to a value greater than 0 in consideration of the influence of the measurement accuracy of the current measurement circuit or the interference factors brought by the detection environment.
- step 202 on the basis of charging the battery cell with a constant voltage source, an additional constant current source can be used to charge the battery cell.
- the output current of the constant current source can be a preset value.
- the output current may be smaller than the self-discharge current of the cell determined empirically.
- the constant current source can also be set to output a current of 0-100 ⁇ A according to different types of cells.
- the constant current source is added to the charging process of the battery, which can also be controlled by the processor.
- the processor determines that k s is greater than 0, it can control the constant current source to charge the battery with the preset output current, and at the same time, keep the constant voltage source to charge the battery. state of charge.
- the processor can also time the charging process of the battery cell using the constant current source and the constant voltage source.
- step 203 when the charging time of the battery cell by the constant current source and the constant voltage source reaches the third preset duration, that is, the above-mentioned second moment, the target within the second preset duration after the second moment can be further obtained.
- the second rate of change of current with time is, the above-mentioned second moment.
- 120s may correspond to the above-mentioned third preset duration
- parameters such as the second preset duration or the third preset duration can be set as required.
- the second rate of change may be denoted as k 0 .
- the absolute value of the second rate of change k 0 is less than or equal to the second threshold, the self-discharge current of the cell can be detected.
- the second threshold may be greater than or equal to zero. In one example, the second threshold may be equal to zero.
- k may be greater than 0.
- the charging current due to the potential difference between the constant voltage source and the battery continues to increase, so that the total charging current (ie, the target current) of the battery continues to increase.
- the target current is equal to the self-discharge current of the cell, the potential difference between the constant voltage source and the cell will no longer change, and the target current will also tend to be stable, that is, the rate of change of the target current with time is 0.
- the target current can be considered to be equal to the self-discharge current of the cell, and the target current can be measured by the above-mentioned current measurement circuit.
- the k value may not always be equal to 0.
- the above-mentioned second threshold may take a value slightly greater than 0, such as 3mA/s.
- the absolute value of the second rate of change is less than or equal to the second threshold, it can be considered that the target current has stabilized, and then the target current at the second moment can be used as the self-discharge current of the battery cell.
- the target current is stable.
- the absolute value of the second rate of change is less than or equal to the second threshold, it can also be calculated according to the second threshold.
- the target current within the fourth preset time period after the moment determines the self-discharge current of the battery cell.
- the fourth preset duration may be set according to actual needs.
- the median value of the target current within the fourth preset time period after the second moment may also be used as the self-discharge current of the battery cell.
- the target current measured by the current measurement circuit may include the output current of the constant current source and the current due to the potential difference between the constant voltage source and the cell. As shown above, when the target current is stable, the self-discharge current can be obtained.
- the self-discharge current is determined by the characteristics of the battery core, and its specific value can be considered constant.
- the purpose of using a constant voltage source and a constant current source to charge the cell is to make the target current equal to the self-discharge current. In the case of adding a constant current source, the requirement for the potential difference between the constant voltage source and the cell is reduced.
- the time for the output voltage of the cell to drop from 3V to 2.99V is obviously shorter than the time for the output voltage of the cell to drop from 3V to 2.98V. Therefore, in the case of adding a constant current source, the time required to detect the self-discharge current of the battery cell can be effectively shortened.
- each data may be determined according to actual conditions.
- the battery self-discharge current detection method controls the constant voltage source to start charging the battery at the first moment, and obtains the first rate of change of the target current with time within the first preset time period after the first moment.
- the first rate of change is greater than the first threshold, control the constant current source and constant voltage source to charge the battery cell, and use the constant current source and constant voltage source to charge the battery cell for the third preset duration to the second moment , acquiring a second rate of change of the target current over time within a second preset time period after the second moment.
- the self-discharge current of the battery cell is determined according to the target current at the second moment or the target current within a fourth preset time period after the second moment.
- the detection efficiency of the self-discharge current of the cell can be effectively improved.
- the constant current source is added to charge the cell Charging can overcome the influence of factors such as cell polarization on the detection process, and improve the detection accuracy of the self-discharge current of the cell.
- the above-mentioned first threshold may be determined according to the above-mentioned first rate of change. For example, if the acquired first rate of change is greater than the second threshold, the first threshold may be set as the first rate of change 3% of the rate. In this way, the first threshold can be associated with the discharge characteristic of the battery itself, so that the setting of the first threshold is more reasonable.
- the method before obtaining the first rate of change of the target current over time within the first preset time period after the first moment, the method further includes:
- Controlling the constant voltage source to start charging the battery at the first moment may include:
- the voltage value of the battery cell in an open circuit state that is, the above-mentioned target voltage value can be measured.
- the above-mentioned open circuit state may be a state where the battery cell has no external load. Under normal circumstances, the voltage value of the battery cell in the open circuit state is equal to its rated output voltage; however, due to the existence of self-discharge current, the power in the battery cell will be consumed, and the voltage value in the open circuit state will also be reduced. .
- the voltage value of the open-circuit state of the battery cell that is, the above-mentioned target voltage value may be acquired.
- the target voltage value can be collected by the above-mentioned voltage measurement circuit, and the target voltage value can be transmitted to the processor, and the processor can control the input voltage of the constant voltage source according to the target voltage value.
- the input voltage of the constant voltage source is equal to the target voltage value of the cell. In this way, in the process of using the constant voltage source to charge the cell, to a certain extent, it is not necessary to introduce a charge and discharge process other than the self-discharge of the cell, which improves Detection efficiency of cell self-discharge current.
- the cell self-discharge current detection method may also include:
- control the constant voltage source When the first rate of change is less than or equal to the first threshold, control the constant voltage source to keep charging the battery until the first rate of change is greater than the first threshold, return to control the constant current source and constant voltage source to charge the battery A step of.
- the first threshold is equal to 0 and the first rate of change k s is greater than the first threshold, it indicates that the self-discharge of the battery cell is in line with the theoretical working state. That is to say, when the first rate of change k s is greater than the threshold value, it can be considered that the battery cell has been sufficiently rested and the state is relatively stable.
- the state of the battery cell is not stable enough.
- this state may be caused by the fact that the battery cell has not been fully rested and there is polarization.
- the constant voltage source is controlled to keep charging the battery until the first rate of change is greater than the first threshold, and then the constant current source is added to further charge the battery.
- the self-discharge current is detected to improve the accuracy of the self-discharge current detection result.
- the real-time acquisition of the first rate of change can be maintained, so as to timely determine the moment when the first rate of change is greater than the first threshold, and then the constant current source can be added in time Charge the battery to improve the monitoring efficiency of the self-discharge current of the battery.
- the first rate of change when the first rate of change is less than or equal to the first threshold, the first rate of change may also be acquired after charging the cell with a constant voltage source for a preset period of time.
- the cell self-discharge current detection method may also include:
- the self-discharge current of the battery cell is determined according to the target current at the third moment, or the target current within the seventh preset time period after the third moment;
- the output current of the constant current source can be a preset value i 0 , in practical applications, it may be due to the influence of factors such as the preset value i 0 being much smaller than the self-discharge current of the cell , resulting in that the target current and the self-discharge current of the cell have not yet reached a balance when the second moment is reached.
- the absolute value of the above-mentioned second rate of change k 0 is usually greater than the second threshold.
- the output current of the constant current source may be adjusted when the absolute value of the second rate of change k 0 is greater than the second threshold.
- a preset fixed current value ⁇ i can be added to the preset value i 0 to obtain the adjusted output current (i 0 + ⁇ i) of the constant current source.
- ⁇ i may not be a fixed value.
- the magnitude of ⁇ i may be affected by the second rate of change k 0 .
- the charging time can be timed.
- the charging time of 90s may correspond to the sixth preset duration
- each time length is an example for the convenience of understanding the specific implementation process of the cell self-discharge current detection method. In practical applications, each time length can be set according to needs.
- the self-discharge current of the cell can be determined according to the target current at the third moment, or the target current within the seventh preset time period after the third moment.
- the method of determining the self-discharge current here is actually similar to the method of determining the self-discharge current when the absolute value of k 0 is less than or equal to the second threshold above, and will not be repeated here for simplicity of description.
- the step of adjusting the output current of the constant current source may be returned. It is easy to understand that in this case, in the process of detecting the self-discharge current of the battery cell, there may be multiple processes of adjusting the output current of the constant current source.
- the process of adjusting the output current of the constant current source from i 0 to i 1 can be defined as the first adjustment of the output current of the constant current source.
- the process of adjusting the output current of the constant current source from i1 to i2 can be defined as the second adjustment of the output current of the constant current source, and so on.
- the steps of adjusting the output current of the constant current source for the nth time, charging the battery for the sixth preset duration, and obtaining the third rate of change can be defined as being performed in the nth adjustment cycle.
- the process of detecting the self-discharge current of the cell by adjusting the output current of the constant current source can be described as:
- Step 1 the output current of the constant current source is adjusted to obtain an adjusted output current i n , where n is a positive integer.
- Step 2 Use a constant voltage source and a constant current source with an output current of in to charge the cell for the sixth preset time period and reach the third moment.
- Step 3 Obtain a third rate of change kn of the target current over time within a fifth preset time period after the third moment.
- Step 4 Determine whether the absolute value of the third rate of change k n is less than or equal to the second threshold; if yes, then determine the self-discharge current of the cell; if not, return to step 1, or enter the nth +1 adjustment period.
- adjusting the output current of the constant current source may include:
- the first output current is the output current obtained after adjusting the output current of the constant current source for the n-1th time;
- Adjust the first output current to obtain the second output current wherein the second output current is the output current obtained after adjusting the output current of the constant current source for the nth time, n is a positive integer, and when n is equal to 1 , the first output current is a preset current.
- the output current obtained after adjusting the output current of the constant current source for the nth time that is, the above-mentioned second output current
- the first output current can be denoted as in -1 .
- n is a positive integer, and when n is equal to 1, i n-1 may be i 0 , which is the preset value of the output current of the above-mentioned constant current source, which may be simply referred to as preset current here.
- the adjustment when adjusting the output current of the constant current source for the nth time, the adjustment may be performed on the basis of the output current obtained after the output current of the constant current source is adjusted for the n-1th time. In this way, it is helpful to adjust the output current of the constant current source according to the real-time charging condition of the battery cell, and improve the reliability of the adjustment of the output current of the constant current source.
- the preset current i 0 may be 10 ⁇ A
- adjusting the first output current to obtain the second output current includes:
- the target rate of change is the third rate of change obtained after adjusting the output current of the constant current source for the n-1 time.
- the target rate of change is the second rate of change;
- the first output current is adjusted according to the target current adjustment amount to obtain the second output current.
- the rate of change k of the target current can gradually change from a positive value to 0. With the addition of a constant current source, this change process will be accelerated.
- the output current of the constant current source is adjusted each time, a fixed output current increase step is maintained.
- the increase step is large, it is easy to cause the output current of the constant current source to be greater than that of the battery cell.
- self-discharge current it is difficult to effectively detect the self-discharge current of the cell.
- the target rate of change can be obtained, and the target current adjustment amount when the output current of the constant current source is adjusted for the nth time can be determined according to the target rate of change.
- the target rate of change is the third rate of change obtained after the n-1th adjustment of the output current of the constant current source.
- the target rate of change may correspond to k n-1 .
- n is a positive integer, and when n is equal to 1, k n-1 may be k 0 , which is the above-mentioned second rate of change.
- the target current adjustment amount when adjusting the output current of the constant current source for the nth time, if k n-1 is positive and greater than the first threshold, the target current adjustment amount can be determined as 5 ⁇ A; if k n-1 is a negative value, and its absolute value is greater than the first threshold, then the target current adjustment amount can be determined as -2 ⁇ A.
- the preset adjustment step size can be determined as the target current adjustment amount in the nth adjustment cycle, and the preset adjustment step size can be determined according to the positive and negative conditions of the target change rate .
- the first output current may be further adjusted according to the target current adjustment amount to obtain the second output current.
- determining the adjustment amount for the first output current based on the target rate of change can improve the rationality of the obtained second output current, and help to achieve a state of balance between the target current and the self-discharge current of the cell more efficiently. , to achieve reliable detection of the self-discharge current of the cell.
- the target current adjustment amount is determined according to the target change rate, including:
- the product of the target rate of change and the preset ratio is determined as the target current adjustment amount, and the preset ratio is a positive number.
- the product of k n-1 and the preset ratio can be determined as the nth adjustment cycle Target current adjustment amount.
- the preset ratio may be an empirical value.
- the preset ratio can be determined as 10/k s , so that the preset ratio is associated with the discharge characteristics of the cell itself, improving the rationality of the preset ratio.
- the preset ratio can be predetermined according to the type of the battery cell, without considering the above-mentioned first change rate k s .
- the method for detecting the cell self-discharge current can be implemented based on the framework shown in FIG. 1 .
- the battery self-discharge current detection method includes the following steps:
- Step 301 the voltage measurement circuit measures the open circuit voltage (Open Circuit Voltage, OCV) of the battery cell, and charges the battery cell as a constant output voltage;
- OCV Open Circuit Voltage
- the OCV (set equal to U 0 ) measured by the voltage measurement circuit can be sent to the processor, and the processor controls the constant voltage source to output U 0 to charge the battery according to the OCV.
- Step 302 the processor differentiates (dI/dt) the current-time (I-t) curve in real time to obtain the differential value k;
- the current I can be collected by the current measurement circuit, and the current I can be regarded as the total charging current (ie, the target current) for the battery cell.
- the differential value k may indicate the rate of change of the total charging current to the cell over time. In this step, the differential value k may be considered equal to the above-mentioned first rate of change k s .
- Step 303 the processor judges the differential value k in real time, if k>0, executes step 304, if k ⁇ 0, maintains the constant voltage source to charge the cell, and continues to judge the differential value k;
- the parameter 0 in this step may correspond to the first threshold in the above embodiment.
- i 0 may be an empirical value, which may be determined according to the actual situation of the cell (such as the type of the cell or the k value obtained in step 302, etc.).
- the value range of i 0 may be 0 ⁇ 100 ⁇ A.
- Step 305 the constant current source uses i to charge the cell for a preset time.
- the parameter 0 in this step may correspond to the second threshold in the above embodiment.
- n can be the number of times the step current is applied (or the number of adjustments to i)
- ⁇ i n (t) can be the value of the step current applied for the nth time (or the value of the nth time when i is adjusted). target current adjustment).
- k obtained in step 303 is recorded as k 0
- the value of a may be 1/k 0 ⁇ a ⁇ 2000/k 0 .
- step 308 the current I collected by the current measurement circuit is used as the battery self-discharge current I SD .
- the battery self-discharge current detection method uses a constant current source and a constant voltage source to charge the battery so that the target current is equal to the self-discharge current, thereby measuring the self-discharge current of the battery.
- the time for measuring the self-discharge current can be effectively shortened, and efficient detection of the self-discharge current can be realized.
- the embodiment of the present application also provides a cell self-discharge current detection device, which includes:
- the control acquisition module 401 is used to control the constant voltage source to start charging the battery cell at the first moment, and obtain the first rate of change of the target current with time within the first preset time period after the first moment, and the target current is the total charge of the battery cell. recharging current;
- the first control module 402 is configured to control the constant current source and the constant voltage source to charge the cell when the first rate of change is greater than the first threshold;
- the first acquisition module 403 is used to obtain the second rate of change of the target current over time within the second preset time period after the second moment when the second moment is reached.
- the second moment is to use a constant current source and a constant voltage source The moment when the battery charging time reaches the third preset duration;
- the first determination module 404 is configured to determine the electric current according to the target current at the second moment or the target current within the fourth preset time period after the second moment when the absolute value of the second rate of change is less than or equal to the second threshold. For the self-discharge current of the core, both the first threshold and the second threshold are greater than or equal to zero.
- the cell self-discharge current detection device may also include:
- the second acquisition module is used to acquire the target voltage value of the battery cell in an open circuit state
- control acquisition module 401 can be specifically used to control the constant voltage source to charge the battery cell with the target voltage value as the output voltage.
- the cell self-discharge current detection device may also include:
- the second control module is used to control the constant voltage source to keep charging the cell when the first rate of change is less than or equal to the first threshold, and return to execute the control of the constant current source and the battery until the first rate of change is greater than the first threshold.
- the step of charging the cell with a constant voltage source is used to control the constant voltage source to keep charging the cell when the first rate of change is less than or equal to the first threshold, and return to execute the control of the constant current source and the battery until the first rate of change is greater than the first threshold.
- the cell self-discharge current detection device may also include:
- An adjustment module configured to adjust the output current of the constant current source when the absolute value of the second rate of change is greater than the second threshold
- the third acquisition module is used to obtain the third rate of change of the target current over time within the fifth preset time period after the third moment when the third moment is reached, and the third moment is the output current from the adjusted constant current source Time begins to count, and the time reaches the sixth preset time;
- the second determination module is configured to determine the current according to the target current at the third moment or the target current within the seventh preset time period after the third moment when the absolute value of the third rate of change is less than or equal to the second threshold.
- Core self-discharge current
- the execution module is configured to return to the step of adjusting the output current of the constant current source when the absolute value of the third rate of change is greater than the second threshold.
- adjustment modules may include:
- An acquisition unit configured to acquire a first output current, where the first output current is the output current obtained after adjusting the output current of the constant current source for the n-1th time;
- the adjustment unit is configured to adjust the first output current to obtain a second output current, wherein the second output current is the output current obtained after adjusting the output current of the constant current source for the nth time, n is a positive integer, and at n When equal to 1, the first output current is the preset current.
- the adjustment unit may include:
- the determination subunit is used to determine the target current adjustment amount according to the target rate of change, the target rate of change is the third rate of change obtained after the n-1th adjustment of the output current of the constant current source, and when n is equal to 1, The target rate of change is the second rate of change;
- the adjustment subunit is used to adjust the first output current according to the target current adjustment amount to obtain the second output current.
- the determination subunit may be specifically configured to: determine the product of the target rate of change and a preset ratio as the target current adjustment amount, and the preset ratio is a positive number.
- the battery self-discharge current detection device is a device corresponding to the above-mentioned battery self-discharge current detection method, and all the implementation methods in the above method embodiments are applicable to the embodiments of the device, and can also achieve the same technical effect.
- FIG. 5 shows a schematic diagram of a hardware structure of an electronic device provided by an embodiment of the present application.
- the electronic device may include a processor 501 and a memory 502 storing computer program instructions.
- processor 501 may include a central processing unit (CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or may be configured to implement one or more integrated circuits of the embodiments of the present application.
- CPU central processing unit
- ASIC Application Specific Integrated Circuit
- Memory 502 may include mass storage for data or instructions.
- memory 502 may include a hard disk drive (Hard Disk Drive, HDD), a floppy disk drive, a flash memory, an optical disk, a magneto-optical disk, a magnetic tape, or a Universal Serial Bus (Universal Serial Bus, USB) drive or two or more Combinations of multiple of the above.
- Storage 502 may include removable or non-removable (or fixed) media, where appropriate. Under appropriate circumstances, the storage 502 may be inside or outside the comprehensive gateway disaster recovery device.
- memory 502 is a non-volatile solid-state memory.
- Memory may include read only memory (ROM), random access memory (RAM), magnetic disk storage media devices, optical storage media devices, flash memory devices, electrical, optical, or other physical/tangible memory storage devices.
- ROM read only memory
- RAM random access memory
- magnetic disk storage media devices magnetic disk storage media devices
- optical storage media devices flash memory devices
- electrical, optical, or other physical/tangible memory storage devices include one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software comprising computer-executable instructions, and when the software is executed (e.g., by one or multiple processors) operable to perform the operations described with reference to the method according to the present disclosure.
- the processor 501 reads and executes the computer program instructions stored in the memory 502 to implement any one of the cell self-discharge current detection methods in the above-mentioned embodiments.
- the electronic device may further include a communication interface 503 and a bus 504 .
- a processor 501 a memory 502 , and a communication interface 503 are connected through a bus 504 to complete mutual communication.
- the communication interface 503 is mainly used to implement communication between modules, devices, units and/or devices in the embodiments of the present application.
- the bus 504 includes hardware, software or both, and couples the components of the online data flow billing device to each other.
- the bus may include Accelerated Graphics Port (AGP) or other graphics bus, Enhanced Industry Standard Architecture (EISA) bus, Front Side Bus (FSB), HyperTransport (HT) interconnect, Industry Standard Architecture (ISA) Bus, Infiniband Interconnect, Low Pin Count (LPC) Bus, Memory Bus, Micro Channel Architecture (MCA) Bus, Peripheral Component Interconnect (PCI) Bus, PCI-Express (PCI-X) Bus, Serial Advanced Technology Attachment (SATA) bus, Video Electronics Standards Association Local (VLB) bus or other suitable bus or a combination of two or more of these.
- Bus 504 may comprise one or more buses, where appropriate.
- embodiments of the present application may provide a computer storage medium for implementation.
- Computer program instructions are stored on the computer storage medium; when the computer program instructions are executed by the processor, any method for detecting the battery self-discharge current in the above-mentioned embodiments is implemented.
- the functional blocks shown in the above structural block diagrams may be implemented as hardware, software, firmware or a combination thereof.
- it When implemented in hardware, it may be, for example, an electronic circuit, an application specific integrated circuit (ASIC), suitable firmware, a plug-in, a function card, or the like.
- ASIC application specific integrated circuit
- the elements of the present application are the programs or code segments employed to perform the required tasks.
- Programs or code segments can be stored in machine-readable media, or transmitted over transmission media or communication links by data signals carried in carrier waves.
- "Machine-readable medium" may include any medium that can store or transmit information.
- machine-readable media examples include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and the like.
- Code segments may be downloaded via a computer network such as the Internet, an Intranet, or the like.
- processors may be, but are not limited to, general purpose processors, special purpose processors, application specific processors, or field programmable logic circuits. It can also be understood that each block in the block diagrams and/or flowcharts and combinations of blocks in the block diagrams and/or flowcharts can also be realized by dedicated hardware for performing specified functions or actions, or can be implemented by dedicated hardware and Combination of computer instructions to achieve.
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Abstract
Description
Claims (10)
- 一种电芯自放电电流检测方法,包括:控制恒压源在第一时刻开始对电芯充电,获取所述第一时刻之后第一预设时长内目标电流随时间的第一变化率,所述目标电流为对所述电芯的总充电电流;在所述第一变化率大于第一阈值的情况下,控制恒流源与所述恒压源对电芯充电,所述第一阈值大于或等于0;在到达第二时刻的情况下,获取所述第二时刻之后第二预设时长内目标电流随时间的第二变化率,所述第二时刻为使用所述恒流源与所述恒压源对所述电芯的充电时间到达第三预设时长的时刻;在所述第二变化率的绝对值小于或等于第二阈值的情况下,根据所述第二时刻的目标电流或者所述第二时刻之后第四预设时长内的目标电流,确定所述电芯的自放电电流,所述第二阈值大于或等于0。
- 根据权利要求1所述的方法,其中,所述获取所述第一时刻之后第一预设时长内目标电流随时间的第一变化率之前,所述方法还包括:获取所述电芯在开路状态的目标电压值;所述控制恒压源在第一时刻开始对电芯充电,包括:控制所述恒压源在第一时刻开始以所述目标电压值为输出电压对所述电芯充电。
- 根据权利要求1或2所述的方法,还包括:在所述第一变化率小于或等于所述第一阈值的情况下,控制所述恒压源保持对所述电芯充电,直至所述第一变化率大于所述第一阈值时,返回执行所述控制恒流源与所述恒压源对电芯充电的步骤。
- 根据权利要求1至3中任一项所述的方法,所述方法还包括:在所述第二变化率的绝对值大于所述第二阈值的情况下,调整所述恒 流源的输出电流;在到达第三时刻的情况下,获取所述第三时刻之后第五预设时长内目标电流随时间的第三变化率,所述第三时刻为从调整所述恒流源的输出电流的时刻开始计时,且计时到达第六预设时长的时刻;在所述第三变化率的绝对值小于或等于所述第二阈值的情况下,根据所述第三时刻的目标电流,或者所述第三时刻之后第七预设时长内的目标电流,确定所述电芯的自放电电流;在所述第三变化率的绝对值大于所述第二阈值的情况下,返回执行所述调整所述恒流源的输出电流的步骤。
- 根据权利要求4所述的方法,其中,所述调整所述恒流源的输出电流,包括:获取第一输出电流,所述第一输出电流为第n-1次调整所述恒流源的输出电流后得到的输出电流;对第一输出电流进行调整,得到第二输出电流,其中,所述第二输出电流为第n次调整所述恒流源的输出电流后得到的输出电流,n为正整数,且在n等于1的情况下,所述第一输出电流为预设电流。
- 根据权利要求5所述的方法,其中,所述对第一输出电流进行调整,得到第二输出电流,包括:根据目标变化率,确定目标电流调整量,所述目标变化率为在第n-1次调整所述恒流源的输出电流后获取的第三变化率,在n等于1的情况下,所述目标变化率为所述第二变化率;根据所述目标电流调整量,对所述第一输出电流进行调整,得到所述第二输出电流。
- 根据权利要求6所述的方法,其中,所述根据目标变化率,确定目标电流调整量,包括:将所述目标变化率与预设比例的乘积确定为所述目标电流调整量,所述预设比例为正数。
- 一种电芯自放电电流检测装置,包括:控制获取模块,用于控制恒压源在第一时刻开始对电芯充电,获取所述第一时刻之后第一预设时长内目标电流随时间的第一变化率,所述目标电流为对所述电芯的总充电电流;第一控制模块,用于在所述第一变化率大于第一阈值的情况下,控制恒流源与所述恒压源对电芯充电;第一获取模块,用于在到达第二时刻的情况下,获取所述第二时刻之后第二预设时长内目标电流随时间的第二变化率,所述第二时刻为使用所述恒流源与所述恒压源对所述电芯的充电时间到达第三预设时长的时刻;第一确定模块,用于在所述第二变化率的绝对值小于或等于第二阈值的情况下,根据所述第二时刻的目标电流或者所述第二时刻之后第四预设时长内的目标电流,确定所述电芯的自放电电流,所述第一阈值与所述第二阈值均大于或等于0。
- 一种电子设备,包括:处理器以及存储有计算机程序指令的存储器;所述处理器执行所述计算机程序指令时实现如权利要求1-7任意一项所述的电芯自放电电流检测方法。
- 一种计算机存储介质,其中,所述计算机存储介质上存储有计算机程序指令,所述计算机程序指令被处理器执行时实现如权利要求1-7任意一项所述的电芯自放电电流检测方法。
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JP2023539050A JP7408021B1 (ja) | 2021-08-09 | 2022-06-28 | セル自己放電電流検出方法、装置、デバイス及びコンピュータ記憶媒体 |
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