CN110824253B - Method and device for detecting direct current impedance of battery, electronic equipment and computer storage medium - Google Patents
Method and device for detecting direct current impedance of battery, electronic equipment and computer storage medium Download PDFInfo
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Abstract
The disclosure provides a method and a device for detecting direct current impedance of a battery, electronic equipment and a computer storage medium. The transduction process of the battery comprises a first transduction phase and a second transduction phase which are continuous, and the method comprises the following steps: in the first transduction stage, acquiring a first transduction current of the battery; when the first transduction stage is switched to the second transduction stage, acquiring a first voltage of the battery; in the second transduction stage, acquiring a second transduction current of the battery; when the second transduction stage reaches a first preset time length, acquiring a second transduction voltage of the battery; and determining the direct current impedance of the battery according to the difference value of the first voltage and the second voltage and the difference value of the first transduction current and the second transduction current. The method and the device can realize the measurement of the direct current impedance of the battery in the continuous energy conversion process of the battery.
Description
Technical Field
The present disclosure relates to the field of electronic devices, and in particular, to a method and an apparatus for detecting a dc impedance of a battery, an electronic device, and a computer storage medium.
Background
The dc impedance is a very important parameter related to the charging and discharging processes of the lithium ion battery, and mainly includes the ohmic impedance and the polarization impedance during the battery operation process. The measurement of dc impedance is difficult because the polarization impedance fluctuates greatly as the charging and discharging of the battery progresses due to the uncertainty of the polarization impedance.
At present, a mode capable of monitoring the direct current impedance in real time does not exist, and most of the modes are charging discontinuously by controlling electronic equipment, namely the electronic equipment needs to be stopped charging in the charging process so as to meet the measuring condition of the direct current impedance. However, the intermittent charging mode can cause the charging speed to be severely limited, so that the charging speed is hardly allowed in the actual use process. How to measure the direct current impedance of the battery under the condition of not influencing the charging speed is an urgent problem to be solved.
The above information disclosed in this background section is only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not constitute prior art that is already known to a person of ordinary skill in the art.
Disclosure of Invention
One object of the present disclosure is to enable measurement of the dc impedance of a battery during continuous transduction of the battery.
In order to solve the technical problem, the following technical scheme is adopted in the disclosure:
according to one aspect of the present disclosure, there is provided a method for detecting dc impedance of a battery, wherein a transduction process of the battery includes a first transduction stage and a second transduction stage, which are consecutive, the method including:
in the first transduction stage, acquiring a first transduction current of the battery;
when the first transduction stage is switched to the second transduction stage, acquiring a first voltage of the battery;
in the second transduction stage, acquiring a second transduction current of the battery;
when the second transduction stage reaches a first preset time length, acquiring a second transduction voltage of the battery;
and determining the direct current impedance of the battery according to the difference value of the first voltage and the second voltage and the difference value of the first transduction current and the second transduction current.
According to another aspect of the present disclosure, a device for detecting a dc impedance of a battery is provided, a transduction process of the battery includes a first transduction stage and a second transduction stage, which are consecutive, and the device for detecting the dc impedance of the battery includes:
the transduction current acquisition module is used for acquiring a first transduction current of the battery in the first transduction stage;
the battery voltage acquisition module is used for acquiring a first voltage of the battery when the first transduction stage is switched to the second transduction stage;
the transduction current acquisition module is further used for acquiring a second transduction current of the battery in the second transduction stage;
the battery voltage acquisition module is further used for acquiring a second transduction current of the battery when the second transduction stage reaches a first preset duration;
and the direct current impedance determining module is used for determining the direct current impedance of the battery according to the difference value of the first voltage and the second voltage and the difference value of the first transduction current and the second transduction current.
According to another aspect of the present disclosure, an electronic device is provided, including:
a storage unit storing a detection program of the battery DC impedance;
and the processing unit is used for executing the steps of the detection method of the battery direct-current impedance when the detection program of the battery direct-current impedance is operated.
According to another aspect of the present disclosure, a computer storage medium is provided, which stores a battery dc impedance detection program, which when executed by at least one processor implements the steps of the battery dc impedance detection method.
In the embodiment of the disclosure, the direct current impedance of the battery is measured and calculated by using the voltage difference and the transduction current difference of the battery in the continuous first transduction stage and the second transduction stage in the transduction process, so that the measurement of the direct current impedance of the battery is realized. Therefore, in the process of measuring and calculating the direct-current impedance of the battery, the energy conversion process of the battery is not required to be stopped, so that the normal charging and use of the electronic equipment are not influenced, the measurement of the direct-current impedance is effectively facilitated, and the charging speed is ensured;
in addition, when the second transduction voltage is obtained, a period of time after the transduction stage is switched is avoided, so that the influence of the switching process on the polarization impedance of the battery is avoided, and the measured and calculated direct-current impedance of the battery has higher accuracy.
In addition, in the embodiment of the disclosure, the direct current impedance is measured and calculated in the battery transduction process, so that dynamic monitoring of the direct current impedance of the battery is realized, guidance can be provided for aspects such as a charging strategy and battery working safety, and the use safety of the electronic device is guaranteed.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The above and other objects, features and advantages of the present disclosure will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings.
FIG. 1 is a schematic diagram of an electronic device shown according to an example;
FIG. 2 is a flow chart illustrating a method of detecting DC impedance of a battery according to an exemplary embodiment;
FIG. 3 is a flow chart illustrating a method of detecting DC impedance of a battery according to another exemplary embodiment;
FIG. 4 is a graph illustrating charging voltage versus charging current over time, according to an exemplary embodiment;
FIG. 5 is a charging current profile for a step charge according to an exemplary embodiment;
FIG. 6 is a block diagram illustrating a configuration of a device for detecting DC impedance of a battery according to another exemplary embodiment;
FIG. 7 is a system architecture diagram of an electronic device shown according to an example.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The drawings are merely schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the drawings denote the same or similar parts, and thus their repetitive description will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the disclosure. One skilled in the relevant art will recognize, however, that the subject matter of the present disclosure can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and the like. In other instances, well-known structures, methods, devices, implementations, materials, or operations are not shown or described in detail to avoid obscuring aspects of the disclosure.
In the present disclosure, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present disclosure can be understood by those of ordinary skill in the art as appropriate.
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 implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present disclosure, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specifically limited otherwise.
Preferred embodiments of the present disclosure are described in further detail below with reference to the accompanying drawings of the present specification.
The present disclosure proposes an electronic device, which may be a smart terminal, a mobile terminal device, configured with a battery power supply system. The electronic device includes, but is not limited to, a device configured to receive/transmit communication signals via a wireline connection, such as via a Public Switched Telephone Network (PSTN), a Digital Subscriber Line (DSL), a digital cable, a direct cable connection, and/or another data connection/network and/or via a wireless interface, for example, for a cellular network, a Wireless Local Area Network (WLAN), a digital television network such as a digital video broadcasting-handheld (DVB-H) network, a satellite network, an amplitude modulation-frequency modulation (AM-FM) broadcast transmitter, and/or another communication terminal. Communication terminals arranged to communicate over a wireless interface may be referred to as "wireless communication terminals", "wireless terminals", and/or "smart terminals". Examples of smart terminals include, but are not limited to, satellite or cellular phones; personal Communication System (PCS) terminals that may combine cellular radiotelephones with data processing, facsimile, and data communication capabilities; personal Digital Assistants (PDAs) that may include radiotelephones, pagers, internet/intranet access, Web browsers, notepads, calendars, and/or Global Positioning System (GPS) receivers; and conventional laptop and/or palmtop receivers or other electronic devices that include a radiotelephone transceiver. In addition, the terminal may further include, but is not limited to, a rechargeable electronic device having a charging function, such as an electronic book reader, a smart wearable device, a mobile power source (e.g., a charger, a travel charger), an electronic cigarette, a wireless mouse, a wireless keyboard, a wireless headset, a bluetooth speaker, and the like.
The following describes a currently mainstream Constant Current and Constant Voltage (CCCV) charging method, which is applicable to both wired charging and wireless charging.
The charging process of the battery may include: a trickle charge phase (or mode), a constant current charge phase (or mode), a constant voltage charge phase (or mode), and a supplemental charge phase (or mode).
In the trickle charge phase, the fully discharged battery is pre-charged (i.e., recovery charging), the trickle charge current is usually one tenth of the constant current charge current, and when the battery voltage rises above the trickle charge voltage threshold, the charging current is increased to enter the constant current charge phase.
In the constant current charging stage, the battery is charged by constant current, the charging voltage rises rapidly, and when the charging voltage reaches the expected charging voltage threshold value of the battery, the constant voltage charging stage is switched. The constant current is typically a nominal charge rate current, such as a high rate 3C current, where C is the battery capacity. Assuming a battery capacity of 1700mAh, the constant current is 3 × 1700mA — 5.1A.
In the constant voltage charging stage, the battery is charged at a constant voltage, the charging current is gradually reduced, and when the charging current is reduced to a set current threshold, the battery is fully charged. In the CCCV charging mode, the current threshold is typically set to 0.01C, where C is the battery capacity. Still assuming a battery capacity of 1700mAh, the current threshold is 0.01 x 1700mA to 17 mA.
After the battery is fully charged, partial current loss occurs due to the influence of self-discharge of the battery, and the charging stage is shifted to. During the boost charging phase, the charging current is small only to ensure that the battery is at full charge.
It should be noted that the constant current charging phase does not require the charging current to be kept completely constant, and may refer to, for example, that the peak value or the average value of the charging current is kept constant for a period of time. In practice, the constant current charging stage may be a Multi-stage constant current charging (Multi-stage constant current charging) manner.
The segmented constant-current charging may have M constant-current stages (M is an integer not less than 2), the segmented constant-current charging starts the first-stage charging with a predetermined charging current, the M constant-current stages of the segmented constant-current charging are sequentially executed from the first stage to the mth stage, and the current magnitude may be reduced when the previous constant-current stage in the constant-current stages is shifted to the next constant-current stage; when the battery voltage reaches the charging termination voltage threshold, the previous constant current stage in the constant current stages will shift to the next constant current stage. The current conversion process between two adjacent constant current stages can be gradual change or step jump change.
An exemplary structure of the electronic device of the present disclosure is described below.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an electronic device according to an embodiment of the disclosure. The electronic device 10 may include a rear housing 11, a display 12, a circuit board, and a battery. It should be noted that the electronic device 10 is not limited to include the above contents. Wherein the rear shell 11 may form the outer contour of the electronic device 10. In some embodiments, the rear housing 11 may be a metal rear housing, such as a metal such as magnesium alloy, stainless steel, and the like. It should be noted that the material of the rear case 11 in the embodiment of the present application is not limited to this, and other manners may also be adopted, such as: the rear housing 11 may be a plastic rear housing, a ceramic rear housing, a glass rear housing, or the like.
Wherein the display screen 12 is mounted in the rear case 11. The display screen 12 is electrically connected to the circuit board to form a display surface of the electronic device. In some embodiments, the display surface of the electronic device 10 may be provided with non-display areas, such as: the top end or/and the bottom end of the electronic device 10 may form a non-display area, that is, the electronic device 10 forms a non-display area on the upper portion or/and the lower portion of the display 12, and the electronic device 10 may mount a camera, a receiver, and the like on the non-display area. Note that the display surface of the electronic device 10 may not be provided with the non-display area, that is, the display 12 may be a full-screen. The display screen may be laid over the entire display surface of the electronic device 10, so that the display screen can be displayed in a full screen on the display surface of the electronic device 10.
The electronic device 10 may include input-output circuitry, which may be disposed on a circuit board. The input-output circuitry may be used to enable the electronic device 10 to enable input and output of data, i.e., to allow the electronic device 10 to receive data from external devices and also to allow the electronic device 10 to output data from the electronic device 10 to external devices. The input-output circuit may further include a sensor. The sensors may include ambient light sensors, proximity sensors based on light and capacitance, touch sensors (e.g., based on optical touch sensors and/or capacitive touch sensors, where the touch sensors may be part of a touch display screen or may be used independently as a touch sensor structure), acceleration sensors, temperature sensors, and other sensors, among others.
The electronic device 10 also includes a charging circuit. The charging circuit may charge a battery of the electronic device 10. The charging circuit may be used to further regulate the charging voltage and/or charging current input from the adapter to meet the charging requirements of the battery.
The electronic device 10 is provided with a charging interface, which may be, for example, a USB 2.0 interface, a microsub interface, or a USB TYPE-C interface. In some embodiments, the charging interface may also be a lightning interface, or any other type of parallel or serial interface capable of being used for charging. The charging interface is connected with the adapter through a data line, the adapter acquires electric energy from mains supply, and the electric energy is transmitted to the charging circuit through the data line and the charging interface after voltage conversion, so that the electric energy can be charged into the battery cell to be charged through the charging circuit.
Fig. 2 shows a flowchart of a method for detecting a dc impedance of a battery according to an exemplary embodiment of the present disclosure. The present embodiment is exemplified by applying the method to the terminal shown in fig. 1. The method in the present disclosure is applied to the transduction process of a battery. The transduction process may be a charging process or a discharging process. In contrast, the transducing current may be a charging current or a discharging current, respectively. Here, the transduction process includes a first transduction phase and a second transduction phase in succession, the method including:
step S21, in the first transduction phase, acquiring a first transduction current of the battery;
step S22, when the first transduction phase is switched to the second transduction phase, acquiring a first voltage of the battery;
step S23, in the second transduction phase, acquiring a second transduction current of the battery;
step S24, when the second transduction stage reaches a first preset duration, acquiring a second transduction current of the battery;
step S25, determining the dc impedance of the battery according to the difference between the first voltage and the second voltage and the difference between the first transduction current and the second transduction current.
In this embodiment, the transducing current in the first transducing phase and the second transducing phase should have a certain difference. Specifically, the average value of the transduction current in the first transduction stage is a first average current, and the average value of the transduction current in the second transduction stage is a second average current; the difference between the first average current and the first average current is greater than or equal to a first difference;
the difference value between the transduction current in the first transduction stage and the first average current is smaller than or equal to a second difference value;
the difference between the transduction current in the second transduction stage and the second average current is less than or equal to a third difference;
the first difference is greater than the second difference, and the first difference is greater than the third difference.
For example, the first difference is 1A, the second difference is 0.3A, and the third difference is 0.2A. The first average current is 3A, the second average current is 2A, and the transduction current in the first transduction stage is within 3 +/-0.3A; the transduction current in the first transduction stage should be 2 ± 0.2A. Therefore, the transduction current of the first transduction stage and the second transduction stage can be kept smooth.
In the method, the transduction current in the first transduction stage and the transduction current in the second transduction stage are kept stable, so that the stability of the internal polarization impedance in the first transduction stage and the second transduction stage is improved, and the accuracy of the direct current impedance measured and calculated is improved.
In the following embodiments, the transduction process is described as an example of the charging process. It will be understood by those skilled in the art that the embodiments disclosed in the present disclosure can also be applied to the discharge process to perform the dc impedance measurement.
Fig. 3 shows a flowchart of a method for detecting a dc impedance of a battery according to another exemplary embodiment of the present disclosure. In one embodiment, the transduction process is a charging process; the first transduction stage is a first charging stage, and the second transduction stage is a second charging stage. The method comprises the following steps:
step S211, in the first charging phase, obtaining a first charging current of the battery;
in one embodiment, the charging phase corresponds to a charging mode. Generally, the electronic device 10 is charged in a certain charging mode, such as a constant current and constant voltage charging mode, a segmented constant current charging mode, a pulse charging mode, and the like. The charging mode typically comprises several successive charging phases. For example, the constant-current constant-voltage charging mode at least comprises a constant-current charging stage and a constant-voltage charging stage. Each charging current gear in the segmented constant-current charging mode corresponds to a charging stage. Each charging gear may correspond to a charging phase corresponding to PD charging.
Referring to fig. 4, fig. 4 shows a charging voltage-charging current curve with time in the VOOC charging mode. The first charging stage and the second charging stage can adopt two continuous constant current stages in VOOC charging.
In another embodiment, the charging phase is independent of the concept of the charging mode, and may be a certain divided section of constant current charging in the whole charging process, and the charging current and the charging duration of the charging phase may be set. The current charging phase can be understood to be within the current charging period.
The battery protection board in the electronic device 10 generally has a fuel gauge thereon, so that the charging current of the battery can be detected by the fuel gauge. In another embodiment, a hall sensor may also be used to detect the charging current. The detected current values can be transmitted to a processing unit for calculation such as summation, averaging and the like.
In this step, there may be different embodiments of obtaining the charging current according to the type of the first charging phase.
In an embodiment, when the first charging phase is a constant current charging phase, the charging current is obtained at least once. The charging current value may be acquired at any time in the charging phase.
Specifically, in the first charging phase, obtaining a first charging current of the battery includes:
and after entering the first charging stage, acquiring the constant charging current in the first charging stage as the first charging current.
In another embodiment, the first charging phase is not a constant current charging phase. The charging current curve in the first charging phase may be in the shape of a diagonal line, or a wavy line, or a rectangular wave. The average value of the charging current in the first charging period can be obtained as the first charging current.
When the duration of the first charging phase is long, the average current can be determined for a certain segment of the first charging phase.
In this embodiment, the setting of obtaining the first charging current of the battery in the first charging stage includes:
in the first charging stage and within a second preset time from the time when the first charging stage is switched to the second charging stage, the charging current of the battery is obtained;
and calculating the average charging current in the second preset time period according to the charging current of the battery to be used as the first charging current.
In this embodiment, the second preset time period may be determined according to the average charging current value of the first charging phase. Within the second preset time, when the average current in the first charging stage has better stability, the polarization impedance can have better stability, so that the finally calculated direct-current impedance of the battery has higher accuracy.
It is to be explained here that by monitoring the charging current change, the switching point in time of the first charging phase to the second charging phase can be determined. For example, the charging current of the second charging phase is smaller than the charging current of the first charging phase. When the charging current is detected to drop to a certain value, it is determined that the first charging phase is switched to the second charging phase.
For a particular charging mode, the charging phases involved are generally fixed, so that the moment at which the first charging phase switches to the second charging phase is determined by the progress of the charging program.
According to the method and the device, the average value of the charging current within a period of time close to the switching point is selected to serve as the first charging current, so that the first charging current and the battery voltage at the switching point have a good corresponding relation, and the method and the device are favorable for improving the accuracy of the process of calculating the direct-current impedance of the battery in the follow-up process.
Further, in the method, in step S221, when the first charging phase is switched to the second charging phase, a first voltage of the battery is obtained;
in the above-described embodiment, the manner of determining the timing at which the first charging phase is switched to the second charging phase has been described. The first voltage of the battery is the voltage value at the end of the first charging phase.
Further, in the method, in step S231, in the second charging phase, a second charging current of the battery is obtained;
in an embodiment, when the second charging phase is a constant current charging phase, the charging current is obtained at least once. The charging current value may be acquired at any time in the charging phase.
Specifically, in the second charging phase, obtaining a second charging current of the battery includes:
and after entering the second charging phase, acquiring the constant charging current in the second charging phase as the second charging current.
In another embodiment, the second charging phase is not a constant current charging phase. The charging current curve in the second charging phase may be in the shape of a diagonal line, or a wavy line, or a rectangular wave. The average value of the charging current in the second charging period can be obtained as the second charging current.
Specifically, in the second charging phase, obtaining a second charging current of the battery includes:
acquiring the charging current of the battery within a first preset time after the second charging stage begins;
and calculating the average charging current in the first preset time period according to the charging current of the battery to serve as the second charging current.
For example, the average charging current may be sampled every 1 millisecond, and when the first preset time length is reached, the sampled average charging current value may be averaged to serve as the second charging current.
Further, in step S241, when the second charging stage reaches the first preset duration, the second charging voltage of the battery is obtained.
In this step, when the first charging stage is switched to the second charging stage, the battery voltage is read after the polarization impedance of the battery is stabilized.
For example, in the case of the segmented constant current charging, when the first charging stage is switched to the second charging stage, the charging current will drop significantly, and the battery voltage will also drop significantly immediately due to the ohmic resistance. Since the polarization impedance is not stable, the dc impedance of the battery at this time has a large instability. After the first preset time, the polarization impedance is stabilized, and the read voltage value can represent the real direct current impedance of the battery.
In one embodiment, the first predetermined time period is generally not less than 10 seconds. Therefore, when measuring the dc impedance, the battery should be kept charged within 10 seconds after switching to the second charging phase.
In another embodiment, the first preset duration may be determined according to a second charging current value in the second charging phase. Therefore, the obtaining a second charging current of the battery when entering the second charging phase for the first preset duration includes:
determining the first preset time according to the second charging current;
acquiring the time length after entering the second charging stage;
and when the second charging stage is started and the first preset time length is reached, acquiring the current voltage of the battery to serve as the second voltage.
In this embodiment, the correspondence relationship between the charging current and the first preset time period may be preset. Therefore, when the method is executed, the first preset time corresponding to the second charging current can be found by reading the corresponding relation. The corresponding relation can be obtained by testing in a laboratory before the battery leaves a factory.
Of course, the charging current and the first preset time period may also be embodied as a functional relationship. The first preset time period is calculated by bringing a second charging current into the function. The functional relationship may be obtained by fitting the data.
In another embodiment, the time at which the battery voltage is read may be determined from the rate of change of the battery voltage after entering the second charging phase. Specifically, when entering the second charging phase and reaching a first preset duration, obtaining a second charging current of the battery includes:
when entering the second charging stage, acquiring the change rate of the battery voltage;
and when the change rate of the battery voltage is greater than or equal to a preset first rate, acquiring the current voltage of the battery as the second voltage.
When just switching to the second charging phase, because the polarization impedance is small and unstable, the polarization impedance gradually stabilizes with time, and at the same time, the dc impedance becomes larger and larger, so that the change rate of the battery voltage is slowed down. In this embodiment, therefore, the change rate according to the cell voltage is detected to determine the stabilization timing of the polarization voltage, so that the cell voltage is read after the polarization voltage is stabilized.
Further, the method further comprises: step S25, determining the dc impedance of the battery according to the difference between the first voltage and the second voltage and the difference between the first charging current and the second charging current, includes:
calculating the difference value of the first voltage and the second voltage and the difference value of the first charging current and the second charging current;
and substituting the difference value of the first voltage and the second voltage and the difference value of the first charging current and the second charging current into a preset direct-current impedance calculation formula according to a preset direct-current impedance calculation formula to determine the direct-current impedance.
After the difference between the first voltage and the second voltage and the difference between the first charging current and the second charging current are determined according to the above embodiment, the dc impedance may be further calculated by using a preset dc impedance calculation formula.
In one embodiment, the dc impedance is calculated as: r ═ V2-V1|/| I2-I1 |; wherein, R is the DC impedance of the battery, V1 is the first voltage, V2 bit second voltage, I1 is the first charging current, I2 is the second charging current.
The calculated direct current impedance is the direct current impedance corresponding to the first preset duration time in the second charging stage. When the second charging stage is constant current charging, the calculated direct current impedance is the direct current impedance corresponding to the stage after the first preset time length in the second charging stage.
It is to be understood that the above calculation formula of the dc impedance is not limited thereto, and may be a dc impedance determination model. The direct current impedance determination model can also be a training model based on an artificial neural network and trained according to a large amount of experimental data, and the model takes the difference value of the first voltage and the second voltage and the difference value of the first charging current and the second charging current as input and takes the direct current impedance of the battery as output.
For example, if the charging current in the first charging stage is 3A, the voltage value after constant current charging for 20min is 4.1V, and then the charging stage is switched to the second charging stage, the charging current in the second charging stage is 2A, and the voltage value after constant current charging for 10s is 4.06V, the dc impedance value of the battery at 4.06V is (4.1-4.06)/(3-2) is 0.04 Ω.
Based on the above embodiment, if the charging process includes a plurality of charging stages, the method for detecting dc impedance provided in this embodiment may be applied to measure and calculate the corresponding dc impedance in each charging stage.
Because the polarization internal resistance of the battery has better stability in the constant-current charging stage, the direct-current impedance of the battery measured and calculated by the method has higher accuracy corresponding to step charging (including segmented constant-current charging, VOOC quick charging and the like).
Referring to fig. 5, fig. 5 is a charging current variation curve of step charging according to an exemplary embodiment. It can be understood that after the previous constant current stage in the constant current stage is shifted to the next constant current stage, the current magnitude can be reduced; when the battery voltage reaches the charging termination voltage threshold, the previous constant current stage in the constant current stages will shift to the next constant current stage. The current conversion process between two adjacent constant current stages can be gradual change or step jump change.
It is understood that the method disclosed herein can be applied to a battery discharge process, and specifically, the method comprises:
the transduction process is a discharge process; the first transduction stage is a first discharge stage, and the second transduction stage is a second discharge stage;
in the first transduction phase, acquiring a first transduction current of the battery, including:
in the first discharging stage, acquiring a first discharging current of the battery;
when the first transduction phase is switched to the second transduction phase, acquiring a first voltage of the battery, including:
when the first discharging stage is switched to the second discharging stage, acquiring a first voltage of the battery;
in the second transduction phase, acquiring a second transduction current of the battery, including:
in the second discharging stage, acquiring a second discharging current of the battery;
when entering the second transduction stage and reaching the first preset time length, acquiring a second transduction current of the battery, including:
and when the second discharging stage reaches a first preset time length, acquiring a second discharging voltage of the battery.
For the embodiment of measuring the dc impedance of the battery during the discharging process, the embodiment of measuring the dc impedance during the charging process can be referred to.
For example, the battery voltage of the electronic device is 3.8V after the battery is continuously discharged at 500mA for 5min, and then the discharge current is reduced to 50mA because the currently running application program is switched. After the battery is continuously discharged for 20s at 50mA, the voltage value is 3.81V, and the internal resistance value of the battery is 0.022 omega at the moment (3810-3800)/(500-50).
Here, when an application is running on the electronic device or when the electronic device is in a standby state, it is considered that the discharge of the battery is stable. The first discharge phase and the second discharge phase for measuring and calculating the direct current impedance can be set by monitoring the stability of the discharge current of the battery.
In the embodiment of the disclosure, the direct current impedance of the battery is measured and calculated by using the voltage difference and the transduction current difference of the battery in the continuous first transduction stage and the second transduction stage in the transduction process, so that the measurement of the direct current impedance of the battery is realized. Therefore, in the process of measuring and calculating the direct-current impedance of the battery, the energy conversion process of the battery is not required to be stopped, so that the normal charging and use of the electronic equipment are not influenced, and the measurement of the direct-current impedance is effectively facilitated;
in addition, when the second transduction voltage is obtained, a period of time after the transduction stage is switched is avoided, so that the influence of the switching process on the polarization impedance of the battery is avoided, and the measured and calculated direct-current impedance of the battery has higher accuracy.
In addition, in the embodiment of the disclosure, the direct current impedance is measured and calculated in the battery transduction process, so that dynamic monitoring of the direct current impedance of the battery is realized, guidance can be provided for aspects such as a charging strategy and battery working safety, and the use safety of the electronic device is guaranteed.
Furthermore, it should be noted that the above-mentioned figures are only schematic illustrations of the processes involved in the methods according to exemplary embodiments of the present disclosure, and are not intended to be limiting. It will be readily understood that the processes shown in the above figures are not intended to indicate or limit the chronological order of the processes. In addition, it is also readily understood that these processes may be performed synchronously or asynchronously, e.g., in multiple modules.
The following are embodiments of the disclosed apparatus that may be used to perform embodiments of the disclosed methods. For details not disclosed in the embodiments of the apparatus of the present disclosure, refer to the embodiments of the method of the present disclosure.
Referring to fig. 6, in an embodiment, the transduction process of the battery includes a first transduction stage and a second transduction stage, and the device 30 for detecting the dc impedance of the battery includes:
a transduction current obtaining module 31, configured to obtain a first transduction current of the battery in the first transduction phase;
a battery voltage obtaining module 32, configured to obtain a first voltage of the battery when the first transduction phase is switched to the second transduction phase;
the transduction current acquisition module 31 is further configured to acquire a second transduction current of the battery in the second transduction phase;
the battery voltage obtaining module 32 is further configured to obtain a second transduction current of the battery when the second transduction stage reaches a first preset duration;
a dc impedance determining module 33, configured to determine a dc impedance of the battery according to a difference between the first voltage and the second voltage and a difference between the first transduction current and the second transduction current.
In one embodiment, the transduction process is a charging process; the first transduction stage is a first charging stage, and the second transduction stage is a second charging stage;
the transduction current acquisition module 31 is further configured to acquire a first charging current of the battery in the first charging phase;
the battery voltage obtaining module 32 is further configured to obtain a first voltage of the battery when the first charging phase is switched to the second charging phase;
the transduction current acquisition module 31 is further configured to acquire a second charging current of the battery in the second charging phase;
the battery voltage obtaining module 32 obtains a second charging voltage of the battery when the second charging stage reaches a first preset duration.
In one embodiment, the first charging phase is a constant current charging phase;
the transduction current obtaining module 31 is further configured to obtain the constant charging current in the first charging phase after entering the first charging phase, so as to serve as the first charging current.
In one embodiment of the present invention, the substrate is,
the energy conversion current acquisition module 31 is further configured to acquire a charging current of the battery in the first charging stage and within a second preset time from the time when the first charging stage is switched to the second charging stage; and calculating the average charging current in the second preset time period according to the charging current of the battery to be used as the first charging current.
In an embodiment, the second charging phase is a constant current charging phase;
the transduction current obtaining module 31 is further configured to obtain the constant charging current in the second charging phase after entering the second charging phase, so as to serve as the second charging current.
In an embodiment, the transduction current obtaining module 31 is further configured to obtain the charging current of the battery within a first preset time period after the second charging phase starts; and calculating the average charging current in the first preset time period according to the charging current of the battery to serve as the second charging current.
In an embodiment, the device 30 for detecting the dc impedance of the battery further includes:
the change rate detection module is used for acquiring the change rate of the battery voltage when entering the second charging stage;
the battery voltage obtaining module 32 is further configured to obtain a current voltage of the battery as the second voltage when the rate of change of the battery voltage is greater than or equal to a preset first rate.
In one embodiment, the device 30 for detecting the dc impedance of the battery further includes:
the first preset time length determining module is used for determining the first preset time length according to the second charging current;
the duration obtaining module is used for obtaining the duration after the second charging stage is started;
the battery voltage obtaining module 32 is further configured to obtain a current voltage of the battery as the second voltage when the second charging period reaches a first preset duration.
In an embodiment, the transduction process is a discharge process; the first transduction stage is a first discharge stage, and the second transduction stage is a second discharge stage;
the transduction current acquisition module 31 is further configured to acquire a first discharge current of the battery in the first discharge phase;
the battery voltage obtaining module 32 is further configured to obtain a first voltage of the battery when the first discharging phase is switched to the second discharging phase;
the transduction current acquisition module 31 is further configured to acquire a second discharge current of the battery in the second discharge phase;
the battery voltage obtaining module 32 is further configured to obtain a second discharging voltage of the battery when the second transduction stage reaches the first preset duration and the second discharging stage reaches the first preset duration.
In one embodiment, the transduction process is stepped charging, and the first charging stage and the second charging stage are two continuous constant current charging stages in the stepped charging.
In an embodiment, the dc impedance determining module 33 is further configured to calculate a difference between the first voltage and the second voltage, and a difference between the first charging current and the second charging current;
and substituting the difference value of the first voltage and the second voltage and the difference value of the first charging current and the second charging current into a preset direct-current impedance calculation formula according to a preset direct-current impedance calculation formula to determine the direct-current impedance.
In one embodiment, the average value of the transduction current of the first transduction stage is a first average current, and the average value of the transduction current of the second transduction stage is a second average current; the difference between the first average current and the first average current is greater than or equal to a first difference;
the difference value between the transduction current in the first transduction stage and the first average current is smaller than or equal to a second difference value;
the difference between the transduction current in the second transduction stage and the second average current is less than or equal to a third difference;
the first difference is greater than the second difference, and the first difference is greater than the third difference.
It is noted that the block diagram shown in fig. 6 described above is a functional entity and does not necessarily correspond to a physically or logically separate entity. These functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The embodiment also provides an electronic device 10, which includes a storage unit and a processing unit; the storage unit stores a detection program of short circuit in the battery; the processing unit is used for executing the steps of the method for detecting the short circuit in the battery when a program for detecting the short circuit in the battery is operated.
The electronic device 10 proposed by the present disclosure includes a battery, a charging circuit, a storage unit, a processing unit; the storage unit is used for storing a detection program of short circuit in the battery; the processing unit is used for running a detection program of the short circuit in the battery, and when the detection program of the short circuit in the battery is executed, the detection method of the short circuit in the battery is run to detect the short circuit in the battery.
Referring to FIG. 7, the electronic device 10 is embodied as a general purpose computing device. The components of the electronic device 10 may include, but are not limited to: the at least one processing unit 42, the at least one memory unit 41, and the bus 43 connecting the different system components (including the memory unit 420 and the processing unit 410), wherein the memory unit 41 stores program codes, which can be executed by the processing unit 42, so that the processing unit 42 performs the steps according to the various exemplary embodiments of the present disclosure described in the above embodiment section of this specification.
The storage unit 41 may include a readable medium in the form of a volatile storage unit, such as a random access memory unit (RAM)411 and/or a cache memory unit 412, and may further include a read only memory unit (ROM) 413.
The storage unit 41 may also include a program/utility 414 having a set (at least one) of program modules 415, such program modules 415 including, but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which, or some combination thereof, may comprise an implementation of a network environment.
The electronic device 10 may also communicate with one or more external devices 50 (e.g., keyboard, pointing device, bluetooth device, etc.), with one or more devices that enable a user to interact with the electronic device 10, and/or with any devices (e.g., router, modem, display unit 44, etc.) that enable the robotic electronic device 10 to communicate with one or more other computing devices. Such communication may be through an input/output (I/O) interface 45. Also, the robotic electronic device 10 may communicate with one or more networks (e.g., a Local Area Network (LAN), a Wide Area Network (WAN), and/or a public network, such as the internet) via the network adapter 46. As shown in fig. 7, the network adapter 46 communicates with the other modules of the robot's electronic device 10 via the bus 43. It should be understood that although not shown in FIG. 7, other hardware and/or software modules may be used in conjunction with the robotic electronic device 10, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems, among others.
Through the above description of the embodiments, those skilled in the art will readily understand that the exemplary embodiments described herein may be implemented by software, or by software in combination with necessary hardware. Therefore, the technical solution according to the embodiments of the present disclosure may be embodied in the form of a software product, which may be stored in a non-volatile storage medium (which may be a CD-ROM, a usb disk, a removable hard disk, etc.) or on a network, and includes several instructions to enable a computing device (which may be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the embodiments of the present disclosure.
The present disclosure also proposes a computer-readable storage medium that can employ a portable compact disc read only memory (CD-ROM) and include program codes and can be run on a terminal device, such as a personal computer. However, the program product of the present disclosure is not limited thereto, and in the present disclosure, a readable storage medium may be any tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable medium carries one or more programs which, when executed by the apparatus, cause the computer readable medium to implement the method for detecting the dc impedance of the battery as shown in fig. 2.
While the present disclosure has been described with reference to several exemplary embodiments, it is understood that the terminology used is intended to be in the nature of words of description and illustration, rather than of limitation. As the present disclosure may be embodied in several forms without departing from the spirit or essential characteristics thereof, it should also be understood that the above-described embodiments are not limited by any of the details of the foregoing description, but rather should be construed broadly within its spirit and scope as defined in the appended claims, and therefore all changes and modifications that fall within the meets and bounds of the claims, or equivalences of such meets and bounds are therefore intended to be embraced by the appended claims.
Claims (13)
1. A method for detecting direct current impedance of a battery, wherein a transduction process of the battery comprises a first transduction stage and a second transduction stage which are continuous, the battery is used for supplying power to an electronic device, and the method comprises the following steps:
in the first transduction stage, acquiring a first transduction current of the battery;
when the first transduction stage is switched to the second transduction stage, acquiring a first voltage of the battery;
in the second transduction stage, acquiring a second transduction current of the battery;
when the second transduction stage reaches a first preset time length, acquiring a second voltage of the battery;
determining the direct current impedance of the battery according to the difference value of the first voltage and the second voltage and the difference value of the first transduction current and the second transduction current;
the transduction process is a charging process; the first transduction stage is a first charging stage, and the second transduction stage is a second charging stage; the first charging stage and the second charging stage are two continuous constant current stages in the charging process;
in the first transduction phase, acquiring a first transduction current of the battery, including:
in the first charging stage, acquiring a first charging current of the battery;
when the first transduction phase is switched to the second transduction phase, acquiring a first voltage of the battery, including:
when the first charging stage is switched to the second charging stage, acquiring a first voltage of the battery;
in the second transduction phase, acquiring a second transduction current of the battery, including:
in the second charging stage, acquiring a second charging current of the battery;
when entering the second transduction stage and reaching the first preset time length, acquiring a second transduction voltage of the battery, including:
and when the second charging stage is started and the first preset time length is reached, acquiring a second charging voltage of the battery.
2. The method of claim 1, wherein the first charging phase is a constant current charging phase; said obtaining a first charging current of said battery during said first charging phase comprises:
and after entering the first charging stage, acquiring the constant charging current in the first charging stage as the first charging current.
3. The method of claim 1, wherein said obtaining a first charging current of said battery during said first charging phase comprises:
in the first charging stage and within a second preset time from the time when the first charging stage is switched to the second charging stage, the charging current of the battery is obtained;
and calculating the average charging current in the second preset time period according to the charging current of the battery to be used as the first charging current.
4. The method of claim 1, wherein the second charging phase is a constant current charging phase; when entering the second charging stage and reaching a first preset time length, acquiring a second charging current of the battery, comprising:
and after entering the second charging phase, acquiring the constant charging current in the second charging phase as the second charging current.
5. The method of claim 1, wherein said obtaining a second charging current of said battery during said second charging phase comprises:
acquiring the charging current of the battery within a first preset time after the second charging stage begins;
and calculating the average charging current in the first preset time period according to the charging current of the battery to serve as the second charging current.
6. The method of claim 1, wherein obtaining the second charging current of the battery when entering the second charging phase reaches a first preset duration comprises:
determining the first preset time according to the second charging current;
acquiring the time length after entering the second charging stage;
and when the second charging stage is started and the first preset time length is reached, acquiring the current voltage of the battery to serve as the second voltage.
7. The method of claim 1, wherein the transduction process is a discharge process; the first transduction stage is a first discharge stage, and the second transduction stage is a second discharge stage;
in the first transduction phase, acquiring a first transduction current of the battery, including:
in the first discharging stage, acquiring a first discharging current of the battery;
when the first transduction phase is switched to the second transduction phase, acquiring a first voltage of the battery, including:
when the first discharging stage is switched to the second discharging stage, acquiring a first voltage of the battery;
in the second transduction phase, acquiring a second transduction current of the battery, including:
in the second discharging stage, acquiring a second discharging current of the battery;
when entering the second transduction stage and reaching the first preset time length, acquiring a second transduction voltage of the battery, including:
and when the second discharging stage reaches a first preset time length, acquiring a second discharging voltage of the battery.
8. The method of claim 1, wherein the transduction process is a step charging, and the first and second charging phases are two consecutive constant current charging phases of the step charging.
9. The method according to claim 1, wherein the average value of the transduction current in the first transduction phase is a first average current, and the average value of the transduction current in the second transduction phase is a second average current; the difference between the first average current and the first average current is greater than or equal to a first difference;
the difference value between the transduction current in the first transduction stage and the first average current is smaller than or equal to a second difference value;
the difference between the transduction current in the second transduction stage and the second average current is less than or equal to a third difference;
the first difference is greater than the second difference, and the first difference is greater than the third difference.
10. The method of any one of claims 1 to 9, wherein determining the dc impedance of the battery from the difference between the first voltage and the second voltage and the difference between the first transduced current and the second transduced current comprises:
calculating the difference value of the first voltage and the second voltage and the difference value of the first charging current and the second charging current;
and substituting the difference value of the first voltage and the second voltage and the difference value of the first charging current and the second charging current into a preset direct-current impedance calculation formula according to a preset direct-current impedance calculation formula to determine the direct-current impedance.
11. A device for detecting the dc impedance of a battery, wherein the transduction process of the battery comprises the first transduction stage and the second transduction stage as claimed in any one of claims 1 to 10, wherein the device for detecting the dc impedance of the battery comprises:
the transduction current acquisition module is used for acquiring a first transduction current of the battery in the first transduction stage;
the battery voltage acquisition module is used for acquiring a first voltage of the battery when the first transduction stage is switched to the second transduction stage;
the transduction current acquisition module is further used for acquiring a second transduction current of the battery in the second transduction stage;
the battery voltage acquisition module is further used for acquiring a second voltage of the battery when the second transduction stage reaches a first preset duration;
and the direct current impedance determining module is used for determining the direct current impedance of the battery according to the difference value of the first voltage and the second voltage and the difference value of the first transduction current and the second transduction current.
12. An electronic device, comprising:
a storage unit storing a detection program of the battery DC impedance;
a processing unit, configured to execute the steps of the method for detecting a dc impedance of a battery according to any one of claims 1 to 10 when executing the program for detecting a dc impedance of a battery.
13. A computer storage medium, characterized in that the computer storage medium stores a battery dc impedance detection program, and the battery dc impedance detection program, when executed by at least one processor, implements the steps of the battery dc impedance detection method according to any one of claims 1 to 10.
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