CN114994552A - Method and device for calculating short-circuit current of battery and electronic product - Google Patents
Method and device for calculating short-circuit current of battery and electronic product Download PDFInfo
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- CN114994552A CN114994552A CN202210303549.2A CN202210303549A CN114994552A CN 114994552 A CN114994552 A CN 114994552A CN 202210303549 A CN202210303549 A CN 202210303549A CN 114994552 A CN114994552 A CN 114994552A
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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]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- 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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
Abstract
The application discloses a method and a device for calculating a battery short-circuit current, wherein the method comprises the following steps: acquiring the current state and the current capacity of the battery; determining a first capacity interval according to the current state of the battery; judging whether the current capacity is in a first capacity interval or not; when the current capacity is in the first capacity interval, updating the first capacity to be the current capacity; updating the capacity difference value according to the first capacity and the integral capacity; and calculating the short-circuit current of the battery according to the capacity difference. According to the method for calculating the battery short-circuit current, the change condition of the first capacity of the battery can be accurately acquired in real time, so that the battery short-circuit current can be accurately calculated.
Description
The application is a divisional application of an invention patent application with the application date of 2019, 4 and 8, and the application number of 201910277037.1, and the name of the invention patent application is 'method, device and electronic product for calculating battery short-circuit current'.
Technical Field
The present disclosure relates to battery testing technologies, and particularly to a method for calculating a short-circuit current of a battery, a device for calculating a short-circuit current of a battery, and an electronic product.
Background
In the related art, a method for calculating a short circuit in a battery is generally performed when a battery is in a static environment and battery parameters (including current, internal resistance, temperature, and the like) are in a relatively stable state. However, in the actual use process of the battery, the current of the battery is often in a fluctuating state according to the change of the output power, and by the above method, it is difficult to accurately calculate the short-circuit current of the battery.
Disclosure of Invention
The present application is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, a first objective of the present application is to provide a method for calculating a battery short-circuit current, which can accurately obtain a change situation of a first capacity of a battery in real time, so as to accurately calculate the battery short-circuit current.
A second object of the present application is to propose a computer-readable storage medium.
A third object of the present application is to provide an apparatus for calculating a short-circuit current of a battery.
A fourth object of the present application is to provide an electronic product.
In order to achieve the above object, an embodiment of a first aspect of the present application provides a method for calculating a short-circuit current of a battery, where the method includes: acquiring the current state and the current capacity of the battery; determining a first capacity interval according to the current state of the battery; judging whether the current capacity is in the first capacity interval or not; when the current capacity is in the first capacity interval, updating the first capacity to be the current capacity; updating a capacity difference value according to the first capacity and the integral capacity; and calculating the short-circuit current of the battery according to the capacity difference.
According to the method for calculating the short-circuit current of the battery, the current state and the current capacity of the battery are obtained, the first capacity interval is determined according to the current state of the battery, whether the current capacity is in the first capacity interval is judged, when the current capacity is in the first capacity interval, the first capacity is updated to be the current capacity, the capacity difference value is updated according to the first capacity and the integral capacity, and the short-circuit current of the battery is calculated according to the capacity difference value. Therefore, the change situation of the first capacity of the battery can be accurately acquired in real time, and the short-circuit current of the battery can be accurately calculated.
In addition, the method for calculating the short-circuit current of the battery according to the above embodiment of the present application may further have the following additional technical features:
according to an embodiment of the application, determining a first capacity interval according to a current state of the battery comprises: when the battery is in a discharging or charging state at present, determining that the first capacity interval is a first interval, wherein the first interval is a range in which impedance variation trends of the battery are consistent during discharging.
According to an embodiment of the application, determining a first capacity interval according to a current state of the battery comprises: when the battery is in a standing state at present, determining that the first capacity interval is a second interval, wherein the second interval is a range in which impedance variation trends of the battery are consistent when the battery stands.
According to an embodiment of the application, the first interval ranges from [ 70%, 100% ] or [ 30%, 50% ], and the second interval ranges from [0,100% ].
According to an embodiment of the application, before updating the capacity difference value according to the first capacity and the integrated capacity, the method further comprises: the current of the battery is detected, and the current of the battery is integrated to obtain the integrated capacity of the battery.
According to an embodiment of the application, updating a capacity difference value according to the first capacity and an integrated capacity comprises: obtaining a current capacity difference value according to the first capacity and the integral capacity; and when the current capacity difference value is larger than or equal to a first threshold value and the timing exceeds the preset time, updating the capacity difference value to be the current capacity difference value.
According to an embodiment of the application, calculating the short-circuit current of the battery according to the capacity difference comprises: sequentially obtaining a plurality of the capacity difference values; calculating an average capacity difference value of a plurality of the capacity difference values; and calculating the short-circuit current of the battery according to the average capacity difference and the corresponding discharge time of the battery.
To achieve the above object, a second aspect of the present application provides a computer-readable storage medium, on which a computer program is stored, where the computer program is executed by a processor to implement the method for calculating a short-circuit current of a battery provided in the first aspect of the present application.
According to the computer-readable storage medium of the embodiment of the application, by executing the method for calculating the battery short-circuit current, the change situation of the first capacity of the battery can be accurately acquired in real time, so that the battery short-circuit current can be accurately calculated.
In order to achieve the above object, an embodiment of a third aspect of the present application provides an apparatus for calculating a short-circuit current of a battery, including: the acquisition module is used for acquiring the current state and the current capacity of the battery; the determining module is used for determining a first capacity interval according to the current state of the battery; the judging module is used for judging whether the current capacity is in the first capacity interval or not; the updating module is used for updating a first capacity to be the current capacity when the current capacity is in the first capacity interval, and updating a capacity difference value according to the first capacity and the integral capacity; and the calculation module is used for calculating the short-circuit current of the battery according to the capacity difference.
According to the device for calculating the short-circuit current of the battery, the current state and the current capacity of the battery are obtained through the obtaining module, the first capacity interval is determined through the determining module according to the current state of the battery, whether the current capacity is in the first capacity interval is judged through the judging module, the first capacity is updated to be the current capacity through the updating module when the current capacity is in the first capacity interval, the capacity difference value is updated according to the first capacity and the integral capacity, and the short-circuit current of the battery is calculated through the calculating module according to the capacity difference value. Therefore, the change situation of the first capacity of the battery can be accurately acquired in real time, and the short-circuit current of the battery can be accurately calculated.
In addition, the apparatus for calculating a short-circuit current of a battery according to the above-mentioned embodiment of the present application may further have the following additional technical features:
according to an embodiment of the application, the determining module is configured to, when determining a first capacity interval according to the current state of the battery, determine that the first capacity interval is a first interval when the battery is currently in a discharging or charging state, where the first interval is a range in which impedance variation trends of the battery are consistent when the battery is discharged.
According to an embodiment of the application, the determining module is further configured to determine, when determining the first capacity interval according to the current state of the battery, that the first capacity interval is a second interval when the battery is currently in a static state, where the second interval is a range in which impedance variation trends of the battery are consistent when the battery is static.
According to an embodiment of the application, the first interval ranges from [ 70%, 100% ] or [ 30%, 50% ], and the second interval ranges from [0,100% ].
According to an embodiment of the application, before the updating module updates the capacity difference value according to the first capacity and the integrated capacity, the obtaining module is further configured to: the current of the battery is detected, and the current of the battery is integrated to obtain the integrated capacity of the battery.
According to an embodiment of the application, the update module, when updating the capacity difference value according to the first capacity and the integrated capacity, is configured to: and obtaining a current capacity difference value according to the first capacity and the integral capacity, and updating the capacity difference value to be the current capacity difference value when the current capacity difference value is larger than or equal to a first threshold value and timing exceeds preset time.
According to an embodiment of the application, the calculation module is configured to, when calculating the short-circuit current of the battery according to the capacity difference, sequentially obtain a plurality of the capacity differences, calculate an average capacity difference of the plurality of the capacity differences, and calculate the short-circuit current of the battery according to the average capacity difference and a corresponding discharge time of the battery.
In order to achieve the above object, an embodiment of a fourth aspect of the present application provides an electronic product, which includes a battery and an apparatus for calculating a short-circuit current of the battery according to an embodiment of the third aspect of the present application.
According to the electronic product provided by the embodiment of the application, the change condition of the first capacity of the battery can be accurately acquired in real time, so that the short-circuit current of the battery can be accurately calculated.
Drawings
FIG. 1 is a flow chart of a method of calculating a battery short circuit current according to an embodiment of the present application;
FIG. 2a is a graph illustrating the trend of the impedance of a battery under different temperature conditions according to an embodiment of the present application;
FIG. 2b is a graph illustrating the trend of the impedance of the battery under different current conditions, according to an embodiment of the present application;
fig. 2c is a schematic diagram illustrating a variation trend of impedance of a battery when cells in the battery are different according to an embodiment of the present application;
FIG. 3 is a flow chart of a method of calculating a battery short circuit current according to one embodiment of the present application;
FIG. 4 is a schematic diagram of a method of calculating a battery short circuit current according to one embodiment of the present application;
FIG. 5 is a block schematic diagram of an apparatus for calculating a battery short circuit current according to an embodiment of the present application;
fig. 6 is a block schematic diagram of an electronic product according to an embodiment of the application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
A method of calculating a short-circuit current of a battery, a computer-readable storage medium, an apparatus for calculating a short-circuit current of a battery, and an electronic product according to embodiments of the present application are described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a method of calculating a battery short-circuit current according to an embodiment of the present application. As shown in fig. 1, a method for calculating a short-circuit current of a battery according to an embodiment of the present disclosure may include the following steps:
and S1, acquiring the current state and the current capacity of the battery.
Specifically, a state parameter of the battery, for example, a voltage, a current, or the like of the battery, may be obtained, and a current state of the battery may be determined according to a variation trend of the state parameter of the battery, where the current state of the battery may include a discharge state, a charge state, and a rest state, for example, when the voltage of the battery increases, the current state of the battery may be determined to be the charge state; determining a current state of the battery as a discharge state when the voltage of the battery decreases; when the voltage of the battery is not changed, it is determined that the current state of the battery is a stationary state.
The current capacity of the battery can be the percentage of the remaining capacity of the battery after the battery is used for a period of time or left unused for a long time to the total capacity of the battery, wherein if the capacity of the battery is 0, the remaining capacity of the battery is 0; if the capacity of the battery is 100%, the battery is fully charged.
And S2, determining a first capacity interval according to the current state of the battery.
According to an embodiment of the present application, determining a first capacity interval according to a current state of a battery includes: when the battery is in a discharging or charging state, determining that a first capacity interval is a first interval, wherein the first interval is a range in which impedance change trends of the battery are consistent when the battery is discharged.
According to another embodiment of the present application, determining the first capacity interval according to the current state of the battery includes: when the battery is in a standing state at present, determining that the first capacity interval is a second interval, wherein the second interval is a range in which impedance variation trends of the battery are consistent when the battery stands.
Preferably, the range of the first interval may be [ 70%, 100% ] or [ 30%, 50% ], and the range of the second interval may be [0,100% ].
Specifically, the overall impedance of the battery varies somewhat due to the influence of temperature, current, and battery-to-battery variation (variation in the cell of the battery), but the local impedance of the battery varies relatively uniformly within a certain section of the battery (i.e., the first capacity section).
For example, when the battery is currently in a discharging state, as shown in fig. 2a, the overall impedance variation trend of the battery is different under different temperature conditions, but when the capacity interval is [ 70%, 100% ] or [ 30%, 50% ], the local impedance variation trend of the battery is relatively consistent; as shown in fig. 2b, the overall change trend of the impedance of the battery is different under different current conditions, but when the capacity interval is [ 70%, 100% ] or [ 30%, 50% ], the local change trend of the impedance of the battery is relatively consistent; as shown in fig. 2c, when the cells in the battery are different, the overall variation trend of the impedance of the corresponding battery is also different, but when the capacity interval is [ 70%, 100% ] or [ 30%, 50% ], the local variation trend of the impedance of the battery is relatively smooth. Accordingly, when the battery is in a discharged state, the first capacity section may be a first section in which a local variation tendency of the impedance of the battery is relatively uniform, and in which a capacity variation of the battery can be accurately detected, wherein the first section may be [ 70%, 100% ] or [ 30%, 50% ].
Further, when the battery is in a stationary state, the current in the battery cannot fluctuate. When the capacity interval is 0,100%, the variation tendency of the impedance of the battery is relatively uniform, and thus, the second interval may be 0,100%.
S3, it is determined whether the current capacity is in the first capacity interval.
S4, when the current capacity is in the first capacity interval, updating the first capacity to the current capacity.
Specifically, when the current state of the battery is determined to be the discharge state, if the current capacity of the battery is within a first interval, the first capacity of the battery is updated to the current capacity of the battery, for example, if the current capacity of the battery is 40% and is within a first interval [ 30%, 50% ], the first capacity of the battery is updated to 40%; when the current state of the battery is judged to be the standing state, if the current capacity of the battery is within the second interval, the first capacity of the battery is updated to the current capacity of the battery, for example, if the current capacity of the battery is 80% and is within the second interval [0, 100% ], the first capacity of the battery is updated to 80%.
And S5, updating the capacity difference value according to the first capacity and the integral capacity.
According to an embodiment of the present application, before updating the capacity difference value according to the first capacity and the integrated capacity, the method further includes: the current of the battery is detected and integrated to obtain the integrated capacity of the battery.
The current of the battery can be detected in real time through a coulometer, and the integral capacity of the battery can be obtained by calculating the integral of the detected current of the battery with time.
According to one embodiment of the present application, updating the capacity difference based on the first capacity and the integrated capacity includes: obtaining a current capacity difference value according to the first capacity and the integral capacity; and when the current capacity difference value is greater than or equal to the first threshold value and the timing exceeds the preset time, updating the capacity difference value to be the current capacity difference value.
Specifically, after a first capacity interval is determined according to the current state of the battery and the first capacity of the battery is updated according to the first capacity interval, the integral capacity of the battery can be obtained, the difference between the integral capacity of the battery and the first capacity is calculated to obtain the current capacity difference of the battery, and whether the capacity difference is updated or not is judged according to the current capacity difference. If the current capacity difference is greater than or equal to a first threshold (e.g., 10mAh) and the duration exceeds a preset time (e.g., 300s), the capacity difference may be updated, at which time the capacity difference may be updated to the current capacity difference.
According to an embodiment of the application, before obtaining the integrated capacity, it is further required to determine whether the battery meets a condition for assigning an initial value, that is, whether the battery is in a reset/charge-off state, whether the average current of the battery within 50s fluctuates (that is, whether the amplitude of the current change is greater than 150mA), whether the first capacity of the battery is updated, and if the battery is in the reset/charge-off state, or the average current of the battery within 50s fluctuates (that is, the average current of the battery within 50s is unstable), or the first capacity of the battery is not updated (a first capacity non-update interval), assigning an initial value to the battery as a reference value for obtaining the current capacity and the integrated capacity of the battery.
Before the capacity difference is updated, whether or not to update the capacity difference may be determined based on the steady state of the average current of the battery for 50s or the update state of the first capacity of the battery. If the steady state of the average current of the cell over 50s is a change from steady state to non-steady state (i.e., I-50s steady-non-steady state), and the duration exceeds a preset time (e.g., 300 s); or the update state of the first capacity of the battery is an update state to a non-update state (i.e., first capacity update-non-update) and the duration exceeds a preset time (e.g., 300s), the capacity difference value is updated.
And S5, calculating the short-circuit current of the battery according to the capacity difference.
Specifically, the capacity difference Δ SOC of the battery has a certain relationship with the short-circuit current I of the battery, that is,
wherein I is the short-circuit current of the battery, Δ t is the discharge time of the battery, and Δ SOC is the capacitance difference of the battery, so that in practical applications, the short-circuit current of the battery can be obtained according to the variation of the first capacity of the battery (i.e., the capacitance difference of the battery), and the accuracy of calculating the short-circuit current of the battery depends on the accuracy of the obtained variation of the first capacity of the battery.
Therefore, in the embodiment of the application, the first capacity interval of the battery is determined according to the current state of the battery, and the first capacity of the battery is updated in real time according to the first capacity interval of the battery and the current capacity, so that the accuracy of the obtained change situation of the first capacity of the battery, that is, the accuracy of the obtained capacity difference value of the battery is ensured, and the short-circuit current of the battery can be accurately calculated according to the capacity difference value of the battery.
Based on the foregoing embodiment, in order to calculate the short-circuit current of the battery more accurately, in an embodiment of the present application, a method for calculating the short-circuit current of the battery according to the capacity difference of the battery is further provided, and as shown in fig. 3, the method may include the following steps:
s301, a plurality of capacity difference values are obtained in sequence.
Specifically, after the capacity difference is updated, the updated capacity difference, the corresponding integral capacity and the first capacity may be stored in the difference register as a set of data, where the sets of data in the difference register satisfy the first-in first-out principle, that is, the sets of data stored first may be sequentially obtained from the difference register, and the capacity difference corresponding to each set of data may be sequentially calculated to obtain a plurality of capacity differences.
For example, as shown in fig. 4, the multiple sets of data stored in the difference register in time sequence are a data set a, a data set b, a data set c, and a data set d, according to the first-in first-out principle, the four sets of data stored first, i.e., the data set a, the data set b, the data set c, and the data set d, may be sequentially obtained from the difference register, and the capacity differences corresponding to the four data sets, i.e., the capacity differences Δ SOC1, Δ SOC2, Δ SOC3, and Δ SOC4, are respectively calculated.
S302, calculating an average capacity difference value of the plurality of capacity difference values.
Specifically, after obtaining a plurality of capacity difference values in sequence from the difference register, the minimum capacity difference value and the maximum capacity difference value in the plurality of capacity difference values can be removed, and the remaining capacity difference values are averaged to obtain a plurality of capacity difference valuesAverage capacity difference of
For example, assuming that the four capacity difference values obtained from the difference register are Δ SOC1, Δ SOC2, Δ SOC3 and Δ SOC4, respectively, where the capacity difference Δ SOC1 is the largest and the capacity difference Δ SOC4 is the smallest, the average capacity difference value of the four capacity difference values can be calculated after removing the capacity difference Δ SOC1 and the capacity difference Δ SOC4
Namely, it is
And S303, calculating the short-circuit current of the battery according to the average capacity difference and the corresponding discharge time of the battery.
The capacity difference Δ SOC of the battery has a certain relationship with the short-circuit current I of the battery, that is,
where I is the short circuit current of the battery, Δ t is the discharge time of the battery, and Δ SOC is the capacity difference of the battery, therefore, the average capacity difference of the plurality of capacity differences is calculated
Then, the average capacity difference can be used
And the discharge time deltat of the corresponding battery, the short-circuit current Is of the corresponding battery Is calculated, that Is,
specifically, in practical applications, when the short-circuit current of the battery is calculated according to the capacity difference, in order to further improve the accuracy of the calculated short-circuit current of the battery, a plurality of capacity differences may be obtained, and an average capacity difference of the plurality of capacity differences may be calculated to calculate the short-circuit current of the battery according to the average capacity difference of the plurality of capacity differences and the corresponding discharge time of the battery, so that the short-circuit current of the battery may be calculated more accurately.
In summary, according to the method for calculating the short-circuit current of the battery in the embodiment of the present application, the current state and the current capacity of the battery are obtained, the first capacity interval is determined according to the current state of the battery, whether the current capacity is in the first capacity interval is determined, when the current capacity is in the first capacity interval, the first capacity is updated to be the current capacity, the capacity difference value is updated according to the first capacity and the integral capacity, and the short-circuit current of the battery is calculated according to the capacity difference value. Therefore, the change situation of the first capacity of the battery can be accurately acquired in real time, and the short-circuit current of the battery can be accurately calculated.
In addition, embodiments of the present application also provide a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the method for calculating a short-circuit current of a battery described above.
According to the computer-readable storage medium of the embodiment of the application, by executing the method for calculating the short-circuit current of the battery, the change condition of the first capacity of the battery can be accurately acquired in real time, so that the short-circuit current of the battery can be accurately calculated.
Fig. 5 is a block diagram illustrating an apparatus for calculating a short-circuit current of a battery according to an embodiment of the present application. As shown in fig. 5, the apparatus for calculating a battery short-circuit current according to an embodiment of the present disclosure may include an obtaining module 100, a determining module 200, a determining module 300, an updating module 400, and a calculating module 500.
The obtaining module 100 is configured to obtain a current state and a current capacity of a battery; the determining module 200 is configured to determine a first capacity interval according to a current state of a battery; the judging module 300 is configured to judge whether the current capacity is in a first capacity interval; the updating module 400 is configured to update the first capacity to be the current capacity when the current capacity is in the first capacity interval, and update the capacity difference according to the first capacity and the integrated capacity; the calculating module 500 is used for calculating the short-circuit current of the battery according to the capacity difference.
According to an embodiment of the application, the determining module 200, when determining the first capacity interval according to the current state of the battery, is configured to determine the first capacity interval as a first interval when the battery is currently in a discharging or charging state, where the first interval is a range in which impedance variation trends of the battery are consistent when the battery is discharged.
According to an embodiment of the application, the determining module 200, when determining the first capacity interval according to the current state of the battery, is further configured to determine, when the battery is currently in the static state, that the first capacity interval is a second interval, where the second interval is a range in which impedance variation trends of the battery are consistent when the battery is static.
According to one embodiment of the application, the first interval ranges from [ 70%, 100% ] or [ 30%, 50% ], and the second interval ranges from [0,100% ].
According to an embodiment of the application, before the updating module 400 updates the capacity difference value according to the first capacity and the integrated capacity, the obtaining module 100 is further configured to: the current of the battery is detected and integrated to obtain the integrated capacity of the battery.
According to an embodiment of the application, the update module 400, when updating the capacity difference value according to the first capacity and the integrated capacity, is configured to: and obtaining a current capacity difference value according to the first capacity and the integral capacity, and updating the capacity difference value to be the current capacity difference value when the current capacity difference value is larger than or equal to a first threshold value and the timing exceeds preset time.
According to an embodiment of the present application, the calculating module 500 is configured to, when calculating the short-circuit current of the battery according to the capacity difference, sequentially obtain a plurality of capacity differences, calculate an average capacity difference of the plurality of capacity differences, and calculate the short-circuit current of the battery according to the average capacity difference and the corresponding discharge time of the battery.
It should be noted that, details that are not disclosed in the apparatus for calculating a short-circuit current of a battery according to the embodiment of the present application refer to details that are disclosed in the method for calculating a short-circuit current of a battery according to the embodiment of the present application, and detailed descriptions thereof are omitted here.
According to the device for calculating the short-circuit current of the battery, the current state and the current capacity of the battery are obtained through the obtaining module, the first capacity interval is determined through the determining module according to the current state of the battery, whether the current capacity is in the first capacity interval is judged through the judging module, the first capacity is updated to be the current capacity through the updating module when the current capacity is in the first capacity interval, the capacity difference value is updated according to the first capacity and the integral capacity, and the short-circuit current of the battery is calculated through the calculating module according to the capacity difference value. Therefore, the change situation of the first capacity of the battery can be accurately acquired in real time, and the short-circuit current of the battery can be accurately calculated.
Fig. 6 is a block schematic diagram of an electronic product according to an embodiment of the application. As shown in fig. 6, the electronic product 1 according to the embodiment of the present application may include the device 10 for calculating a short-circuit current of a battery and the battery 20.
According to the electronic product provided by the embodiment of the application, the change condition of the first capacity of the battery can be accurately acquired in real time, so that the short-circuit current of the battery can be accurately calculated.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In addition, in the description of the present application, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships that are based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and for simplicity of description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description of the present specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (16)
1. A method of calculating a battery short circuit current, the method comprising:
acquiring the current state and the current capacity of the battery;
determining a first capacity interval according to the current state of the battery;
judging whether the current capacity is in the first capacity interval or not;
when the current capacity is in the first capacity interval, updating the first capacity to be the current capacity;
updating a capacity difference value according to the first capacity and the integral capacity;
and calculating the short-circuit current of the battery according to the capacity difference.
2. The method of claim 1, wherein determining a first capacity interval based on the current state of the battery comprises:
when the battery is in a discharging or charging state at present, determining that the first capacity interval is a first interval, wherein the first interval is a range in which impedance variation trends of the battery are consistent during discharging.
3. The method of claim 2, wherein determining a first capacity interval based on the current state of the battery comprises:
when the battery is in a standing state at present, determining that the first capacity interval is a second interval, wherein the second interval is a range in which impedance variation trends of the battery are consistent when the battery stands.
4. The method according to claim 3, wherein the first interval is in the range of [ 70%, 100% ] or [ 30%, 50% ], and the second interval is in the range of [0,100% ].
5. The method of claim 1, wherein prior to updating a capacity difference value based on the first capacity and an integrated capacity, the method further comprises:
the current of the battery is detected, and the current of the battery is integrated to obtain the integrated capacity of the battery.
6. The method of claim 5, wherein updating a capacity difference based on the first capacity and an integrated capacity comprises:
obtaining a current capacity difference value according to the first capacity and the integral capacity;
and when the current capacity difference value is larger than or equal to a first threshold value and the timing exceeds the preset time, updating the capacity difference value to be the current capacity difference value.
7. The method of claim 1, wherein calculating the short circuit current of the battery based on the capacity difference comprises:
sequentially obtaining a plurality of the capacity difference values;
calculating an average capacity difference value of a plurality of the capacity difference values;
and calculating the short-circuit current of the battery according to the average capacity difference and the corresponding discharge time of the battery.
8. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method of calculating a battery short-circuit current according to any one of claims 1 to 7.
9. An apparatus for calculating a short circuit current of a battery, the apparatus comprising:
the acquisition module is used for acquiring the current state and the current capacity of the battery;
the determining module is used for determining a first capacity interval according to the current state of the battery;
the judging module is used for judging whether the current capacity is in the first capacity interval or not;
the updating module is used for updating a first capacity to be the current capacity when the current capacity is in the first capacity interval, and updating a capacity difference value according to the first capacity and the integral capacity;
and the calculation module is used for calculating the short-circuit current of the battery according to the capacity difference.
10. The apparatus of claim 9, wherein the determining module, when determining the first capacity interval according to the current state of the battery, is configured to determine that the first capacity interval is a first interval when the battery is currently in a discharging or charging state, wherein the first interval is a range in which an impedance change trend of the battery is consistent when the battery is discharged.
11. The apparatus of claim 10, wherein the determining module, when determining the first capacity interval according to the current state of the battery, is further configured to determine the first capacity interval as a second interval when the battery is currently in a static state, wherein the second interval is a range in which an impedance change trend of the battery is consistent when the battery is static.
12. The device of claim 11, wherein the first interval is in the range of [ 70%, 100% ] or [ 30%, 50% ], and the second interval is in the range of [0,100% ].
13. The apparatus of claim 9, wherein the obtaining module is further configured to, before the updating module updates the capacity difference value according to the first capacity and the integrated capacity:
the current of the battery is detected, and the current of the battery is integrated to obtain the integrated capacity of the battery.
14. The apparatus of claim 13, wherein the update module, when updating the capacity difference value based on the first capacity and the integrated capacity, is configured to: and obtaining a current capacity difference value according to the first capacity and the integral capacity, and updating the capacity difference value to be the current capacity difference value when the current capacity difference value is larger than or equal to a first threshold value and timing exceeds preset time.
15. The apparatus of claim 9, wherein the computing module, when computing the short-circuit current of the battery according to the capacity difference, is configured to sequentially obtain a plurality of the capacity differences, compute an average capacity difference of the plurality of the capacity differences, and compute the short-circuit current of the battery according to the average capacity difference and a corresponding discharge time of the battery.
16. An electronic product, characterized in that the electronic product comprises a battery and a device for calculating the short-circuit current of the battery according to any of claims 9-15.
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| CN202210303549.2A CN114994552A (en) | 2019-04-08 | 2019-04-08 | Method and device for calculating short-circuit current of battery and electronic product |
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| CN201910277037.1A CN111796191B (en) | 2019-04-08 | 2019-04-08 | Method and device for calculating short-circuit current of battery and electronic product |
| CN202210303549.2A CN114994552A (en) | 2019-04-08 | 2019-04-08 | Method and device for calculating short-circuit current of battery and electronic product |
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| JP4739040B2 (en) * | 2005-02-18 | 2011-08-03 | パナソニック株式会社 | Secondary battery internal short-circuit detection device, secondary battery internal short-circuit detection method, secondary battery pack and electronic device |
| JP2011135656A (en) * | 2009-12-22 | 2011-07-07 | Sanyo Electric Co Ltd | Battery system, vehicle with the same, and method for detecting internal short circuit in the battery system |
| CN102565611B (en) * | 2011-12-27 | 2014-08-06 | 惠州市亿能电子有限公司 | Internal short-circuit detection method of power battery |
| CN102854470A (en) * | 2012-08-31 | 2013-01-02 | 哈尔滨工业大学 | Measurement method for estimating actual available capacity by SOC (state of charge) of power battery set |
| CN205720590U (en) * | 2016-04-11 | 2016-11-23 | 重庆车辆检测研究院有限公司 | Battery short circuit experimental provision |
| CN107870301B (en) * | 2016-09-27 | 2020-09-04 | 华为技术有限公司 | Method and device for detecting micro short circuit of battery |
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