CN112698229A - Short-circuit current detection method and device, readable storage medium and electronic equipment - Google Patents

Short-circuit current detection method and device, readable storage medium and electronic equipment Download PDF

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Publication number
CN112698229A
CN112698229A CN202011453518.2A CN202011453518A CN112698229A CN 112698229 A CN112698229 A CN 112698229A CN 202011453518 A CN202011453518 A CN 202011453518A CN 112698229 A CN112698229 A CN 112698229A
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battery
determining
internal resistance
soc
preset
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谢红斌
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Abstract

The application discloses a short-circuit current detection method, a short-circuit current detection device, a readable medium and electronic equipment. The short-circuit current detection method comprises the following steps: determining different currents and the voltage of a battery terminal through a preset equivalent circuit model of the battery, and presetting an open-circuit voltage corresponding to the SOC; determining a first SOC corresponding to the first open-circuit voltage and a second SOC corresponding to the second open-circuit voltage according to the first open-circuit voltage and the second open-circuit voltage obtained in the period to be measured and respectively according to a preset corresponding relation between the open-circuit voltage and the SOC; the first open-circuit voltage and the second open-circuit voltage are respectively the open-circuit voltages corresponding to the starting time and the ending time of the period to be measured; determining a first electric quantity change value according to the first SOC and the second SOC; calculating a second electric quantity change value of the battery in the time period to be measured according to the time length of the time period to be measured and the discharge current; and determining the short-circuit current of the battery in the period to be measured according to the first electric quantity change value and the second electric quantity change value. The method can improve the accuracy of detecting the short-circuit current.

Description

Short-circuit current detection method and device, readable storage medium and electronic equipment
Technical Field
The present disclosure relates to the field of electronic devices, and in particular, to a method and an apparatus for detecting a short-circuit current, a readable storage medium, and an electronic device.
Background
In electronic devices (e.g., smart devices such as smart phones and tablet computers), rechargeable batteries are generally used. The protective plate is added to the rechargeable battery in the electronic equipment to control the overcharge, the overdischarge, the overvoltage, the overcurrent, the temperature and the like of the battery and improve the use safety performance of the battery, so that the use safety of the electronic equipment can be ensured. But the protection board function cannot detect a short circuit, a leakage current, and the like inside the battery at present. However, although the short circuit in the battery progresses slowly, safety problems such as thermal runaway, overcharge, or overdischarge may also occur to some extent.
Disclosure of Invention
The embodiment of the application provides a short-circuit current detection method and device, a readable storage medium and electronic equipment, which can improve the accuracy of short-circuit current detection in a battery and improve the safety of a user in using the electronic equipment.
In a first aspect, an embodiment of the present application provides a method for detecting an open-circuit voltage of a battery, including:
in the process that the battery is charged or discharged in a preset time period, according to the initial open-circuit voltage, determining ohmic internal resistance, polarization internal resistance and polarization capacitance corresponding to a preset state of charge (SOC) by adopting an equivalent circuit model;
determining the corresponding relation between the battery terminal voltage and the current according to the ohm internal resistance, the polarization internal resistance and the polarization capacitor;
and determining the open-circuit voltage corresponding to the preset SOC under different currents and battery terminal voltages according to the corresponding relation.
In a second aspect, an embodiment of the present application provides a short-circuit current detection method, including:
in the process that the battery is charged or discharged in a preset time period, according to the initial open-circuit voltage, determining ohmic internal resistance, polarization internal resistance and polarization capacitance corresponding to a preset state of charge (SOC) by adopting an equivalent circuit model;
determining the corresponding relation between the battery terminal voltage and the current according to the preset ohmic internal resistance, the polarization internal resistance and the polarization capacitor;
determining open-circuit voltage corresponding to the preset SOC under different currents and battery terminal voltage according to the corresponding relation;
determining a first open-circuit voltage corresponding to the starting time of a period to be measured and a second open-circuit voltage corresponding to the ending time of the period to be measured;
determining a first SOC corresponding to the first open-circuit voltage and a second SOC corresponding to the second open-circuit voltage according to the open-circuit voltage corresponding to the preset SOC under the different currents and the voltage at the battery terminal;
determining a first theoretical electric quantity change value according to the first SOC and the second SOC;
calculating a second electric quantity change value of the battery in the period to be measured according to the duration of the period to be measured and the discharge current;
and determining the short-circuit current of the battery in the period to be measured according to the first electric quantity change value and the second electric quantity change value.
In a third aspect, an embodiment of the present application provides a battery open-circuit voltage detection apparatus, including:
the first determining module is used for determining ohmic internal resistance, polarization internal resistance and polarization capacitance corresponding to a preset state of charge (SOC) by adopting an equivalent circuit model according to initial open-circuit voltage in the process of charging or discharging a battery in a preset time interval;
the second determining module is used for determining the corresponding relation between the battery terminal voltage and the current according to the ohm internal resistance, the polarization internal resistance and the polarization capacitor;
and the third determining module is used for determining the open-circuit voltage corresponding to the preset SOC under different currents and the voltage of the battery terminal according to the corresponding relation.
In a fourth aspect, an embodiment of the present application provides a short-circuit current detection apparatus, including:
the first determining module is used for determining ohmic internal resistance, polarization internal resistance and polarization capacitance corresponding to a preset state of charge (SOC) by adopting an equivalent circuit model according to initial open-circuit voltage in the process of charging or discharging a battery in a preset time interval;
the second determining module is used for determining the corresponding relation between the battery terminal voltage and the current according to the ohm internal resistance, the polarization internal resistance and the polarization capacitor;
the third determining module is used for determining open-circuit voltages corresponding to the preset SOC under different currents and battery terminal voltages according to the corresponding relation;
the fourth determining module is used for determining a first open-circuit voltage corresponding to the starting time of a period to be measured and a second open-circuit voltage corresponding to the ending time of the period to be measured;
a fifth determining module, configured to determine, according to the different currents and the voltage at the battery terminal, a first SOC corresponding to the first open-circuit voltage and a second SOC corresponding to the second open-circuit voltage, respectively, according to an open-circuit voltage corresponding to the preset SOC;
a sixth determining module, configured to determine a first electric quantity variation value according to the first SOC and the second SOC;
the calculation module is used for calculating a second electric quantity change value of the battery in the period to be measured according to the duration of the period to be measured and the discharge current;
and the seventh determining module is used for determining the short-circuit current of the battery in the period to be measured according to the first electric quantity change value and the second electric quantity change value.
In a fifth aspect, embodiments of the present application provide a computer storage medium storing a plurality of instructions adapted to be loaded by a processor and to perform the method steps provided in the first or second aspect of the embodiments of the present application.
In a sixth aspect, embodiments of the present application provide a computer storage medium storing a plurality of instructions adapted to be loaded by a processor and to perform the method steps provided by the second aspect of the embodiments of the present application.
In a seventh aspect, an embodiment of the present application provides an electronic device, including: a processor and a memory; wherein the memory stores a computer program adapted to be loaded by the processor and to perform the method steps as provided by the first or second aspect of an embodiment of the present application.
In an eighth aspect, an embodiment of the present application provides an electronic device, including: a processor and a memory; wherein the memory stores a computer program adapted to be loaded by the processor and to perform the method steps as provided by the second aspect of the embodiments of the present application.
The beneficial effects brought by the technical scheme provided by some embodiments of the application at least comprise:
in the embodiment of the application, the theoretical open-circuit voltage of the battery can be calculated through the equivalent circuit model of the battery, the theoretical electric quantity change value of the battery in the charging or discharging process can be calculated according to the theoretical open-circuit voltage, and the short-circuit current of the battery can be obtained according to the theoretical electric quantity change value and the actually measured electric quantity change value. The accuracy of detecting the short-circuit current in the battery can be improved by adopting the equivalent circuit model, the safety of using electronic equipment by a user is improved, and meanwhile, the hardware cost can be reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of an equivalent circuit model of a battery according to an embodiment of the present disclosure;
fig. 2a is a schematic flowchart of a method for detecting an open circuit voltage according to an embodiment of the present disclosure;
FIG. 2b is a diagram of a battery terminal voltage U according to an embodiment of the present applicationtCorresponding relation intention with time t;
fig. 3 is a schematic flowchart of another open circuit voltage detection method according to an embodiment of the present disclosure;
fig. 4 is a schematic flowchart of a short-circuit current detection method according to an embodiment of the present disclosure;
fig. 5 is a schematic flowchart of another short-circuit current detection method according to an embodiment of the present disclosure;
fig. 6 is a schematic flowchart of another short-circuit current detection method according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of an open-circuit voltage detection apparatus according to an embodiment of the present disclosure;
fig. 8 is a schematic structural diagram of a short-circuit current detection device according to an embodiment of the present disclosure;
fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims.
In the description of the present application, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art. Further, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The terminal voltage of the battery in the Open state is referred to as an Open Circuit Voltage (OCV). The open circuit voltage of a battery is equal to the difference between the positive electrode potential and the negative electrode potential of the battery when the battery is open circuited (i.e., when no current is passing through the two electrodes).
In the related art, in a scheme of detecting a micro short circuit or a leakage current of a battery through an open voltage, the open voltage is generally calculated using an instantaneous current value and a voltage value measured during charging or discharging of the battery. Due to the large fluctuation of the instantaneous value, the accuracy of the open-circuit voltage is reduced, and the detection accuracy of the micro short circuit or the leakage current of the battery is further influenced.
According to the embodiment of the application, the real-time open-circuit voltage in the battery can be estimated through the battery model, then whether the internal short circuit occurs in the battery can be obtained by calculating the actual discharge capacity value in a certain discharge time and comparing the capacity value calculated through the model, and the internal short circuit current is calculated in real time.
Fig. 1 schematically illustrates an equivalent circuit model of a battery provided in an embodiment of the present application. As shown in fig. 1, the equivalent circuit model of the battery may be a first-order RC circuit, and the equivalent circuit may include: ohmic internal resistance R0Internal polarization resistance R1And a polarization capacitor C1And a power source. Wherein R is1And C1After being connected in parallel with R0Are connected in series. The power source may be equivalent to the OCV of the battery. U shapetThe difference between the positive electrode potential and the negative electrode potential of the battery in a closed state (i.e. when current passes through the two electrodes) is the external terminal voltage value of the battery. In a specific implementation, the external terminal voltage value (hereinafter referred to as terminal voltage) may be measured by a voltage sampler. The voltage sampler may be an analog-to-digital (a/D) converter. U shapetThe expression of (a) is:
Ut=OCV-IR0-U1
wherein I is the current of the battery charging or discharging, U1Is the voltage across RC, U1The expression of (a) is:
where t is the length of time for charging or discharging.
Next, a method for detecting an open-circuit voltage of a battery provided in an embodiment of the present application is described with reference to an equivalent circuit model of the battery shown in fig. 1. As shown in fig. 2a, the method for detecting the open circuit voltage of the battery at least comprises the following steps:
s201: and in the process of charging or discharging the battery within a preset time period, determining the ohmic internal resistance, the polarization internal resistance and the polarization capacitance corresponding to the preset SOC by adopting an equivalent circuit model according to the initial open-circuit voltage.
Specifically, the state of charge (SOC) may be measured by percentage. The percentage is the percentage of the maximum capacity of the battery. For example, when the maximum capacity of the battery is 4000mA and the SOC is 90%, the actual corresponding amount of electricity is 4000mA × 90% — 3600 mA.
Specifically, the equivalent circuit model may be the equivalent circuit model shown in fig. 1, which is a first-order RC charging or discharging circuit. The circuit can realize the charging and discharging processes. The equivalent circuit model may be stored in the memory of the electronic device in the form of a computer program, which is loaded and executed by the processor. It can be seen that charging and discharging are the opposite two processes. In the following examples of the present application, discharge is exemplified.
Specifically, the battery may be made to stand at the preset SOC for a sufficient time t0(t0Preferably greater than 3 hours). The cell is left at rest for a sufficiently long time t0Voltage V after0Set to the initial open circuit voltage VOC. Using a predetermined current I1(I1Preferably less than 1C-rate) discharge time t2(preferably less than 30s) a post-voltage of V2. Where C is the maximum capacity of the battery. For example, if the maximum capacity of the battery is 4000mA, I1Preferably less than 4000 mA. During the whole process from standing to discharging to ending of discharging, the terminal voltage of the battery can be collected in real time through the voltage sampler, so as to obtain the terminal voltage U of the battery shown in fig. 2btCorresponding to time t.
In the embodiment of the application, the ohmic internal resistance is R0Internal polarization resistance of R1Polarization capacitance of C1. The embodiment of the application can calculate R corresponding to different SOCs0、R1And C1. Thereby obtaining the battery end electricity corresponding to the SOCVoltage versus current.
How to calculate R corresponding to a specific SOC according to the embodiment of the present application is described next0、R1And C1. This specific SOC will be referred to as a preset SOC hereinafter.
Specifically, when the battery is first at rest for a sufficiently long time t at the preset SOC0After that, discharge is started and recorded as discharge t2(e.g., without limitation, 1s) followed by a voltage of V1At this time, at the initial stage of discharge, the polarization internal resistance does not participate in the response, so the voltage drop at this time is Δ V1Caused by ohmic internal resistance response, thus Δ V1=V0-V1=I1R0To obtain
It can be known that, in the application scenario of charging, when the battery is first stationary for a sufficient time t 'under the preset SOC'0Charging is started after that, and charging t 'is recorded'2(for example, but not limited to, 1s) and a voltage of V'1At this time, at the initial stage of charging, the polarization internal resistance is not yet involved in the response, and the voltage rise at this time is Δ V'1Due to ohmic internal resistance response, so Δ V'1=V′1-V′0
When the battery is discharged t3(preferably more than 10s) is followed by a voltage V2The voltage drop at this time is Δ V2Caused by the common response of ohmic internal resistance and polarization internal resistance, so that the delta V2=V0-V2=I1R0+I1R1To obtain
In the application scenario of charging, it can be known that when the battery is charged t'3(preferably more than 10s) and a voltage of V'2At this time, the voltage rise is Δ V'2Caused by the joint response of ohmic internal resistance and polarization internal resistance, so delta V'2=V′2-V′0
When t ═ R1C1When the temperature of the water is higher than the set temperature,
at this time, Ut=OCV-I1R0-U1=V0-I1R0-0.63I1R1I.e. UtIs a V3Looking up the battery terminal voltage U shown in FIG. 2btCorresponding relation with time t, the corresponding t value is t1
Thereby can obtain
S202: and determining the corresponding relation between the battery terminal voltage and the current according to the ohm internal resistance, the polarization internal resistance and the polarization capacitor.
Specifically, ohmic internal resistance R is calculated in S2010Internal polarization resistance R1And a polarization capacitor C1The corresponding relation between the battery terminal voltage and the current corresponding to the preset SOC can be obtained as follows:
Ut=OCV-IR0-U1
wherein the content of the first and second substances,t is a charge or discharge time period.
S203: and determining the open-circuit voltage corresponding to the preset SOC under different currents and battery terminal voltages according to the corresponding relation.
Specifically, the current may be measured by a current sampler and the battery terminal voltage may be measured by a voltage sampler. The current sampler may be a current detection circuit composed of a series sampling resistor and an amplifier. Therefore, under the condition of determining the current and the battery terminal voltage, the open-circuit voltage corresponding to the preset SOC is as follows:
OCV=Ut+IR0+U1
the embodiment of the application provides a method for detecting an open-circuit voltage corresponding to a specific SOC. This can improve the accuracy of the battery open-circuit voltage detection. In addition, since the open-circuit voltage corresponding to the specific SOC is calculated through the equivalent circuit mode, the open-circuit voltage is not improved in a hardware structure and can be realized only through programming, and therefore the hardware cost can be reduced.
Fig. 3 schematically illustrates another method for detecting an open-circuit voltage of a battery according to an embodiment of the present application. As shown in fig. 3, the method for detecting the open-circuit voltage of the battery at least comprises the following steps:
s301: and in the process of charging or discharging the battery within a preset time period, determining the ohmic internal resistance corresponding to the preset SOC by adopting an equivalent circuit model according to the initial open-circuit voltage.
Specifically, the equivalent circuit model may be the equivalent circuit model shown in fig. 1, which is a first-order RC charging or discharging circuit. The circuit can realize the charging and discharging processes. The equivalent circuit model may be stored in the memory of the electronic device in the form of a computer program, which is loaded and executed by the processor. It can be seen that charging and discharging are the opposite two processes. In the following examples of the present application, discharge is exemplified.
Specifically, when the battery is first at rest for a sufficiently long time t at the preset SOC0After that, discharge is started and recorded as discharge t2(e.g., without limitation, 1s) followed by a voltage of V1At this time, at the initial stage of discharge, the polarization internal resistance does not participate in the response, so the voltage drop at this time is Δ V1Caused by ohmic internal resistance response, thus Δ V1=V0-V1=I1R0To obtain
It can be known that, in the application scenario of charging, when the battery is first stationary for a sufficient time t 'under the preset SOC'0Charging is started after that, and charging t 'is recorded'2(for example, but not limited to, 1s) and a voltage of V'1At the beginning of chargingIn the period, the polarization internal resistance does not participate in the response, so the voltage rise at the moment is delta V'1Due to ohmic internal resistance response, so Δ V'1=V′1-V′0
S302: and determining the polarization internal resistance corresponding to the preset SOC based on the ohm internal resistance.
Specifically, when the battery is discharged t3(preferably more than 10s) is followed by a voltage V2The voltage drop at this time is Δ V2Caused by the common response of ohmic internal resistance and polarization internal resistance, so that the delta V2=V0-V2=I1R0+I1R1To obtain
In the application scenario of charging, it can be known that when the battery is charged t'3(preferably more than 10s) and a voltage of V'2At this time, the voltage rise is Δ V'2Caused by the joint response of ohmic internal resistance and polarization internal resistance, so delta V'2=V′2-V′0
S303: and determining the polarization capacitor corresponding to the preset SOC based on the polarization internal resistance and the ohm internal resistance.
Specifically, when t ═ R1C1When the temperature of the water is higher than the set temperature,
at this time, Ut=COV-I1R0-U1=V0-I1R0-0.63I1R1I.e. UtIs a V3Looking up the battery terminal voltage U shown in FIG. 2btCorresponding relation with time t, the corresponding t value is t1
Thereby can obtain
S304: and determining the corresponding relation between the battery terminal voltage and the current according to the ohm internal resistance, the polarization internal resistance and the polarization capacitor.
Specifically, S304 may refer to the description of S202, which is not repeated herein.
S305: and determining the open-circuit voltage corresponding to the preset SOC under different currents and battery terminal voltages according to the corresponding relation.
Specifically, S305 can refer to the description of S203, which is not repeated herein.
The embodiment of the application provides a specific calculation process of ohmic internal resistance, polarization internal resistance and polarization capacitance. By controlling the discharge time of the battery, the ohmic internal resistance is calculated at the initial discharge stage, the polarization internal resistance is calculated according to the value of the ohmic internal resistance, and the polarization capacitance is calculated by combining the values of the ohmic internal resistance and the polarization internal resistance. Therefore, the accuracy of the detection of the open-circuit voltage of the battery can be ensured. In addition, since the open-circuit voltage corresponding to the specific SOC is calculated through the equivalent circuit mode, the open-circuit voltage is not improved in a hardware structure and can be realized only through programming, and therefore the hardware cost can be reduced.
Based on the battery open-circuit voltage detection method provided by the embodiment of the application, the application also provides a short-circuit current detection method. As shown in fig. 4, the short-circuit current detection method may include at least the following steps:
s401: and in the process of charging or discharging the battery within a preset time period, determining the ohmic internal resistance, the polarization internal resistance and the polarization capacitance corresponding to the preset SOC by adopting an equivalent circuit model according to the initial open-circuit voltage.
Specifically, S401 may refer to the description of S201, which is not repeated herein.
S402: and determining the corresponding relation between the battery terminal voltage and the current according to the ohm internal resistance, the polarization internal resistance and the polarization capacitor.
Specifically, S402 can refer to the description of S202, which is not repeated herein.
S403: and determining the open-circuit voltage corresponding to the preset SOC under different currents and battery terminal voltages according to the corresponding relation.
Specifically, S403 may refer to the description of S203, which is not repeated herein.
S404: and determining a first open-circuit voltage corresponding to the starting time of the period to be measured and a second open-circuit voltage corresponding to the ending time of the period to be measured.
In particular, assume that the period to be measured is from T1Time of day on, T2The time is over. Recording the first open-circuit voltage as OCV1The second open circuit voltage is OCV2
S405: and determining a first SOC corresponding to the first open-circuit voltage and a second SOC corresponding to the second open-circuit voltage according to the open-circuit voltage corresponding to the preset SOC under the different currents and the battery terminal voltage.
Specifically, the electronic device may repeatedly execute S401-S403 in advance to obtain open-circuit voltages corresponding to different SOCs, so as to obtain a preset corresponding relationship between the open-circuit voltages and the SOCs. The correspondence may be, but is not limited to being, maintained in a table form in a memory of the electronic device.
Suppose that the period to be measured is from T1Time of day on, T2The time is over. Recording the first open-circuit voltage as OCV1The second open circuit voltage is OCV2. The first open-circuit voltage OCV can be obtained by searching the corresponding relation between the preset open-circuit voltage and the SOC1The corresponding SOC is the first SOC and is recorded as the SOC1Second open circuit voltage OCV2The corresponding SOC is the second SOC and is recorded as the SOC2
S406: and determining a first electric quantity change value according to the first SOC and the second SOC.
Specifically, the first electric quantity variation value is a theoretical electric quantity variation value. Theoretical electric quantity variation value delta QnIs the difference between the first SOC and the second SOC and the maximum electric quantity QmaxThe product of (a). Wherein, the maximum electric quantity QmaxThe full charge capacity of the battery, that is, the maximum capacity of the battery mentioned in the foregoing embodiment, is, for example, 4000 mA.
S407: and calculating a second electric quantity change value of the battery in the period to be measured.
Specifically, the second electric quantity variation value is an actual electric quantity variation value. The actual electric quantity change value of the battery in the time period to be measured can be obtained through ampere-hour integral calculation.
Specifically, the calculation formula of the actual electric quantity variation value is as follows:
ΔQ′n=∫Idt
wherein, delta Q'nFor the actual electric quantity variation value, I is the magnitude of the charging or discharging current of the battery, which can be measured by the current sampler.
S408: and determining the short-circuit current of the battery in the period to be measured according to the first electric quantity change value and the first electric quantity change value.
Specifically, the short-circuit current is calculated as follows:
wherein, IShort lengthFor short-circuit current, tnIs the duration of the time period to be measured, namely T2-T1
In the embodiment of the application, the theoretical open-circuit voltage of the battery can be calculated through the equivalent circuit model of the battery, the theoretical electric quantity change value of the battery in the charging or discharging process can be calculated according to the theoretical open-circuit voltage, and the short-circuit current of the battery can be obtained according to the theoretical electric quantity change value and the actually measured electric quantity change value. The accuracy of detecting the short-circuit current in the battery can be improved by adopting the equivalent circuit model, and the probability of misjudgment is reduced, so that the safety problem caused by the short circuit of the battery in the electronic equipment can be effectively avoided, and the safety of using the electronic equipment by a user is improved. In addition, the embodiment of the application calculates the open-circuit voltage corresponding to the specific SOC through the equivalent circuit mode, further detects the short-circuit current, has no improvement on a hardware structure, and can be realized only through programming, so that the embodiment of the application can also reduce the hardware cost.
Fig. 5 illustrates another short-circuit current detection method provided by the embodiment of the present application. As shown in fig. 5, the short-circuit current detection method at least includes the following steps:
s501: and in the process of charging or discharging the battery within a preset time period, determining the ohmic internal resistance corresponding to the preset SOC by adopting an equivalent circuit model according to the initial open-circuit voltage.
Specifically, S501 may refer to the description of S301, and is not described herein again.
S502: and determining the polarization internal resistance corresponding to the preset SOC based on the ohm internal resistance.
Specifically, S502 may refer to the description of S302, which is not repeated herein.
S503: and determining the polarization capacitor corresponding to the preset SOC based on the polarization internal resistance and the ohm internal resistance.
Specifically, S503 may refer to the description of S303, which is not repeated herein.
S504: and determining the corresponding relation between the battery terminal voltage and the current according to the preset ohmic internal resistance, the polarization internal resistance and the polarization capacitor.
Specifically, S504 may refer to the description of S402, which is not repeated herein.
S505: and determining the open-circuit voltage corresponding to the preset SOC under different currents and battery terminal voltages according to the corresponding relation.
Specifically, S505 may refer to the description of S403, which is not repeated herein.
S506: and determining a first open-circuit voltage corresponding to the starting time of the period to be measured and a second open-circuit voltage corresponding to the ending time of the period to be measured.
Specifically, S506 may refer to the description of S404, which is not repeated herein.
S507: and determining a first SOC corresponding to the first open-circuit voltage and a second SOC corresponding to the second open-circuit voltage according to the open-circuit voltage corresponding to the preset SOC under the different currents and the battery terminal voltage.
Specifically, S507 may refer to the description of S405, which is not described herein again.
S508: and determining a first electric quantity change value according to the first SOC and the second SOC.
Specifically, S508 may refer to the description of S406, which is not repeated herein.
S509: and calculating a second electric quantity change value of the battery in the period to be measured.
Specifically, S509 may refer to the description of S407, and is not repeated here.
S510: and determining the short-circuit current of the battery in the period to be measured according to the first electric quantity change value and the second electric quantity change value.
Specifically, S510 may refer to the description of S408, which is not repeated herein.
The embodiment of the application provides a specific calculation process of ohmic internal resistance, polarization internal resistance and polarization capacitance. By controlling the discharge time of the battery, the ohmic internal resistance is calculated at the initial discharge stage, the polarization internal resistance is calculated according to the value of the ohmic internal resistance, and the polarization capacitance is calculated by combining the values of the ohmic internal resistance and the polarization internal resistance. Therefore, the accuracy of the detection of the open-circuit voltage of the battery can be ensured. In addition, the accuracy of detecting the short-circuit current in the battery can be improved by adopting the equivalent circuit model, and the probability of misjudgment is reduced, so that the safety problem caused by the short circuit of the battery in the electronic equipment can be effectively avoided, and the safety of using the electronic equipment by a user is improved. In addition, the embodiment of the application calculates the open-circuit voltage corresponding to the specific SOC through the equivalent circuit mode, further detects the short-circuit current, has no improvement on a hardware structure, and can be realized only through programming, so that the embodiment of the application can also reduce the hardware cost.
Fig. 6 illustrates another short-circuit current detection method provided by the embodiment of the present application. As shown in fig. 6, the short-circuit current detection method at least includes the following steps:
s601: and in the process of charging or discharging the battery within a preset time period, determining the ohmic internal resistance corresponding to the preset SOC by adopting an equivalent circuit model according to the initial open-circuit voltage.
Specifically, S601 may refer to the description of S501, which is not repeated herein.
S602: and determining the polarization internal resistance corresponding to the preset SOC based on the ohm internal resistance.
Specifically, S602 may refer to the description of S502, which is not repeated herein.
S603: and determining the polarization capacitor corresponding to the preset SOC based on the polarization internal resistance and the ohm internal resistance.
Specifically, S603 may refer to the description of S503, which is not repeated here.
S604: and determining the corresponding relation between the battery terminal voltage and the current according to the ohm internal resistance, the polarization internal resistance and the polarization capacitor.
Specifically, S604 may refer to the description of S504, which is not repeated herein.
S605: and determining the open-circuit voltage corresponding to the preset SOC under different currents and battery terminal voltages according to the corresponding relation.
Specifically, S605 refers to the description of S505, and is not described herein again.
S606: and determining a first open-circuit voltage corresponding to the starting time of the period to be measured and a second open-circuit voltage corresponding to the ending time of the period to be measured.
Specifically, S606 can refer to the description of S506, which is not repeated herein.
S607: and determining a first SOC corresponding to the first open-circuit voltage and a second SOC corresponding to the second open-circuit voltage according to the open-circuit voltage corresponding to the preset SOC under the different currents and the battery terminal voltage.
Specifically, S607 can refer to the description of S507, which is not described herein again.
S608: and determining the product of the difference value of the first SOC and the second SOC and the maximum electric quantity of the battery as the first electric quantity change value.
In particular, the first value of variation of electric quantity Δ QnIs the difference between the first SOC and the second SOC and the maximum electric quantity QmaxThe product of (a). Namely: delta Qn=Qmax×(SOC1-SOC2)。
Wherein, the maximum electric quantity QmaxIs the full charge capacity of the battery, i.e. as mentioned in the preceding examplesThe maximum capacity of the battery of (2) is, for example, 4000 mA.
S609: and calculating a second electric quantity change value of the battery in the period to be measured.
Specifically, S609 may refer to the description of S509, which is not repeated herein.
S610: and determining the ratio of the difference value of the first electric quantity change value and the second electric quantity change value to the time length of the time period to be measured, and determining the ratio as the short-circuit current of the battery in the time period to be measured.
Specifically, the short-circuit current is calculated as follows:
wherein, IShort lengthFor short-circuit current, tnIs the duration of the time period to be measured, namely T2-T1
S611: and under the condition that the short-circuit current is smaller than a preset difference value, updating the maximum electric quantity of the battery according to the difference value of the first SOC and the second electric quantity change value.
Specifically, the preset difference is, for example, but not limited to, 10 mA. When the short-circuit current is smaller than the preset difference value, the performance of the battery is still acceptable, and the accuracy of detecting the short-circuit current can be further ensured by updating the maximum electric quantity of the battery.
Specifically, the maximum electric quantity of the battery may be updated according to the actual electric quantity change value, and the specific calculation formula is as follows:
the embodiment of the application provides a specific calculation process of ohmic internal resistance, polarization internal resistance and polarization capacitance. By controlling the discharge time of the battery, the ohmic internal resistance is calculated at the initial discharge stage, the polarization internal resistance is calculated according to the value of the ohmic internal resistance, and the polarization capacitance is calculated by combining the values of the ohmic internal resistance and the polarization internal resistance. Therefore, the accuracy of the detection of the open-circuit voltage of the battery can be ensured. In addition, the embodiment of the application calculates the open-circuit voltage corresponding to the specific SOC through the equivalent circuit mode, further detects the short-circuit current, has no improvement on a hardware structure, and can be realized only through programming, so that the embodiment of the application can also reduce the hardware cost. In addition, the accuracy of short-circuit current detection in the battery can be improved by adopting the equivalent circuit model, the accuracy of short-circuit current detection can be further ensured by updating the maximum electric quantity of the battery, and the probability of misjudgment is further reduced, so that the safety problem caused by short circuit of the battery in the electronic equipment can be further effectively avoided, and the safety of using the electronic equipment by a user is further improved.
The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.
Fig. 7 is a schematic structural diagram of a battery open-circuit voltage detection apparatus according to an exemplary embodiment of the present application. The battery open circuit voltage detection means may be implemented as all or a part of the electronic device by software, hardware, or a combination of both. The battery open circuit voltage detection device 70 may include: a first determination module 710, a second determination module 720, and a third determination module 730. Wherein:
the first determining module 710 is configured to determine, according to an initial open-circuit voltage, an ohmic internal resistance, a polarization internal resistance, and a polarization capacitance corresponding to a preset state of charge SOC by using an equivalent circuit model in a charging or discharging process of a battery in a preset time period;
a second determining module 720, configured to determine a corresponding relationship between a battery terminal voltage and a battery current according to the ohmic internal resistance, the polarization internal resistance, and the polarization capacitor;
and a third determining module 730, configured to determine, according to the correspondence, an open-circuit voltage corresponding to the preset SOC at different currents and the battery terminal voltage.
In some possible embodiments, the equivalent circuit model is a first-order resistance-capacitance (RC) equivalent circuit model; the first determination module 710 includes:
the first determining subunit is used for determining the ohmic internal resistance corresponding to the preset SOC by adopting an equivalent circuit model according to the initial open-circuit voltage in the charging or discharging process of the battery within the preset time period;
the second determining subunit is configured to determine, based on the ohmic internal resistance, the polarization internal resistance corresponding to the preset SOC;
and the third determining subunit is used for determining the polarization capacitor corresponding to the preset SOC based on the polarization internal resistance and the ohm internal resistance.
In some possible embodiments, the battery is charged or discharged at a preset current for the preset time period;
a first determining subunit, specifically configured to determine the ohmic internal resistance according to the following formula:
wherein R is0To the ohmic internal resistance,. DELTA.V1Is a first voltage difference value, which is a change value of the voltage of the battery after the battery is charged or discharged with a preset current within a first preset time period, I1The preset current is used; the first preset time period is a part of the preset time period.
In some possible embodiments, the second determining subunit is specifically configured to determine the polarization internal resistance according to the following formula:
wherein R is1For said internal polarization resistance,. DELTA.V2And the second voltage difference value is a change value of the voltage of the battery after the battery is charged or discharged with a preset current in the preset time period.
In some possible embodiments, the third determining subunit is specifically configured to: determining the polarization capacitance according to the formula:
wherein, t1To a predetermined battery terminal voltage UtIn correspondence with time t, Ut=OCV-I1R0-0.63I1R1Time corresponding to the time.
In some possible embodiments, the relationship between the battery terminal voltage and the current corresponding to the predetermined SOC is: u shapet=OCV-IR0-U1Wherein I is the current; the above-mentioned t is a charge or discharge time period.
The open-circuit voltage detection device provided by the embodiment of the application obtains the open-circuit voltage corresponding to the specific SOC through calculation of a first-order RC equivalent circuit model equivalent to the battery. This can improve the accuracy of the battery open-circuit voltage detection. In addition, since the open-circuit voltage corresponding to the specific SOC is calculated through the equivalent circuit mode, the open-circuit voltage is not improved in a hardware structure and can be realized only through programming, and therefore the hardware cost can be reduced.
It should be noted that, when the battery open-circuit voltage detection apparatus provided in the foregoing embodiment executes the battery open-circuit voltage detection method, only the division of the above functional modules is taken as an example, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules, so as to complete all or part of the above described functions. In addition, the battery open-circuit voltage detection device provided by the above embodiment and the battery open-circuit voltage detection method embodiment belong to the same concept, and the detailed implementation process is shown in the method embodiment, which is not described herein again.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
Referring to fig. 8, a schematic structural diagram of a short-circuit current detection device according to an exemplary embodiment of the present application is shown. The short circuit current detection means may be implemented as all or part of an electronic device by software, hardware, or a combination of both. The short-circuit current detection device 80 may include: a first determination module 810, a second determination module 820, a third determination module 830, a fourth determination module 840, a fifth determination module 850, a sixth determination module 860. A calculation module 870 and a seventh determination module 880. Wherein:
the first determining module 810 is configured to determine an ohmic internal resistance, a polarization internal resistance, and a polarization capacitance corresponding to a preset state of charge SOC by using an equivalent circuit model according to an initial open-circuit voltage during charging or discharging of the battery in a preset time period;
a second determining module 820, configured to determine a corresponding relationship between a battery terminal voltage and a battery current according to the ohmic internal resistance, the polarization internal resistance, and the polarization capacitor;
a third determining module 830, configured to determine, according to the corresponding relationship, an open-circuit voltage corresponding to the preset SOC at different currents and at the voltage at the battery terminal;
a fourth determining module 840, configured to determine a first open-circuit voltage corresponding to a starting time of a period to be measured and a second open-circuit voltage corresponding to an ending time of the period to be measured;
a fifth determining module 850, configured to determine, according to the different currents and the battery terminal voltages, a first SOC corresponding to the first open-circuit voltage and a second SOC corresponding to the second open-circuit voltage, respectively, according to an open-circuit voltage corresponding to the preset SOC;
a sixth determining module 860, configured to determine a first electric quantity variation value according to the first SOC and the second SOC;
the calculating module 870 is configured to calculate a second electric quantity variation value of the battery in the period to be measured according to the duration of the period to be measured and the discharge current;
a seventh determining module 880, configured to determine, according to the first electric quantity variation value and the second electric quantity variation value, a short-circuit current of the battery in the period to be measured.
In some possible embodiments, the equivalent circuit model is a first-order resistance-capacitance (RC) equivalent circuit model; a first determining module 810 comprising:
the first determining subunit is used for determining the ohmic internal resistance corresponding to the preset SOC by adopting an equivalent circuit model according to the initial open-circuit voltage in the charging or discharging process of the battery within the preset time period;
the second determining subunit is configured to determine, based on the ohmic internal resistance, the polarization internal resistance corresponding to the preset SOC;
and the third determining subunit is used for determining the polarization capacitor corresponding to the preset SOC based on the polarization internal resistance and the ohm internal resistance.
In some possible embodiments, the battery is charged or discharged at a preset current for the preset time period;
a first determining subunit, specifically configured to determine the ohmic internal resistance according to the following formula:
wherein R is0To the ohmic internal resistance,. DELTA.V1Is a first voltage difference value, which is a change value of the voltage of the battery after the battery is charged or discharged with a preset current within a first preset time period, I1The preset current is used; the first preset time period is a part of the preset time period.
In some possible embodiments, the second determining subunit is specifically configured to determine the polarization internal resistance according to the following formula:
wherein R is1For said internal polarization resistance,. DELTA.V2Is a second voltage difference value, the secondThe voltage difference value is a change value of the voltage of the battery after the battery is charged or discharged with a preset current in the preset time period.
In some possible embodiments, the third determining subunit is specifically configured to determine the polarization capacitance according to the following formula:
wherein, t1To a predetermined battery terminal voltage UtIn correspondence with time t, Ut=OCV-I1R0-0.63I1R1Time corresponding to the time.
In some possible embodiments, the relationship between the battery terminal voltage and the current corresponding to the predetermined SOC is: u shapet=OCV-IR0-U1Wherein I is the current; the above-mentioned t is a charge or discharge time period.
In some possible embodiments, the sixth determining module 860 is specifically configured to: and determining the product of the difference value of the first SOC and the second SOC and the maximum electric quantity of the battery as the first electric quantity change value.
In some possible embodiments, the seventh determining module 880 is specifically configured to: and determining the ratio of the difference value of the first electric quantity change value and the second electric quantity change value to the time length of the time period to be measured, and determining the ratio as the short-circuit current of the battery in the time period to be measured.
In some possible embodiments, the short-circuit current detection device 80 further includes: and the updating module is used for updating the maximum electric quantity of the battery according to the difference value between the first SOC and the second electric quantity change value under the condition that the short-circuit current is smaller than a preset difference value.
According to the short-circuit current detection device provided by the embodiment of the application, the theoretical open-circuit voltage of the battery can be calculated through the equivalent circuit model of the battery, the theoretical electric quantity change value of the battery in the charging or discharging process can be calculated according to the theoretical open-circuit voltage, and the short-circuit current of the battery can be obtained according to the theoretical electric quantity change value and the actually measured electric quantity change value. The accuracy of detecting the short-circuit current in the battery can be improved by adopting the equivalent circuit model, and the probability of misjudgment is reduced, so that the safety problem caused by the short circuit of the battery in the electronic equipment can be effectively avoided, and the safety of using the electronic equipment by a user is improved. In addition, the embodiment of the application calculates the open-circuit voltage corresponding to the specific SOC through the equivalent circuit mode, further detects the short-circuit current, has no improvement on a hardware structure, and can be realized only through programming, so that the embodiment of the application can also reduce the hardware cost.
It should be noted that, when the short-circuit current detection apparatus provided in the foregoing embodiment executes the short-circuit current detection method, only the division of the functional modules is illustrated, and in practical applications, the functions may be distributed to different functional modules according to needs, that is, the internal structure of the apparatus may be divided into different functional modules to complete all or part of the functions described above. In addition, the short-circuit current detection device and the short-circuit current detection method provided by the above embodiments belong to the same concept, and the detailed implementation process is shown in the method embodiments, which is not described herein again.
The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.
Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in fig. 9, the electronic device 90 may include: at least one processor 901, at least one network interface 904, a user interface 903, memory 905, at least one communication bus 902.
Wherein a communication bus 902 is used to enable connective communication between these components.
The user interface 903 may include a Display screen (Display) and a Camera (Camera), and the optional user interface 903 may also include a standard wired interface and a wireless interface.
The network interface 904 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface), among others.
Processor 901 may include one or more processing cores, among other things. The processor 901 interfaces with various interfaces and circuitry throughout the electronic device 90 to perform various functions and process data of the electronic device 90 by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 905, as well as invoking data stored in the memory 905. Optionally, the processor 901 may be implemented in at least one hardware form of Digital Signal Processing (DSP), Field-Programmable Gate Array (FPGA), and Programmable Logic Array (PLA). The processor 801 may integrate one or more of a Central Processing Unit (CPU), a Graphics Processing Unit (GPU), a modem, and the like. Wherein, the CPU mainly processes an operating system, a user interface, an application program and the like; the GPU is used for rendering and drawing the content required to be displayed by the display screen; the modem is used to handle wireless communications. It is understood that the modem may not be integrated into the processor 901, but may be implemented by a single chip.
The Memory 905 may include a Random Access Memory (RAM) or a Read-Only Memory (Read-Only Memory). Optionally, the memory 905 includes a non-transitory computer-readable medium. The memory 905 may be used to store instructions, programs, code, sets of codes, or sets of instructions. The memory 905 may include a program storage area and a data storage area, wherein the program storage area may store instructions for implementing an operating system, instructions for at least one function (such as a touch function, a sound playing function, an image playing function, etc.), instructions for implementing the above-described method embodiments, and the like; the storage data area may store data and the like referred to in the above respective method embodiments. The memory 905 may optionally be at least one memory device located remotely from the processor 901. As shown in fig. 9, the memory 905, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and an application program.
In the electronic device 90 shown in fig. 9, the user interface 903 is mainly used as an interface for providing input for a user, and acquiring data input by the user; the processor 901 may be configured to call an application program stored in the memory 905, and specifically perform the following operations:
in the process that the battery is charged or discharged in a preset time period, according to the initial open-circuit voltage, determining ohmic internal resistance, polarization internal resistance and polarization capacitance corresponding to a preset state of charge (SOC) by adopting an equivalent circuit model;
determining a corresponding relation between the battery terminal voltage and the current according to the ohm internal resistance, the polarization internal resistance and the polarization capacitor;
and determining the open-circuit voltage corresponding to the preset SOC under different currents and battery terminal voltages according to the corresponding relation.
In some possible embodiments, the processor 901 is further configured to: determining a first open-circuit voltage corresponding to the starting time of a period to be measured and a second open-circuit voltage corresponding to the ending time of the period to be measured;
determining a first SOC corresponding to the first open-circuit voltage and a second SOC corresponding to the second open-circuit voltage according to the open-circuit voltage corresponding to the preset SOC under the different currents and the voltage at the battery terminal;
determining a first electric quantity change value according to the first SOC and the second SOC;
calculating a second electric quantity change value of the battery in the period to be measured according to the duration of the period to be measured and the discharge current;
and determining the short-circuit current of the battery in the period to be measured according to the first electric quantity change value and the second electric quantity change value.
In some possible embodiments, the equivalent circuit model is a first-order resistance-capacitance (RC) equivalent circuit model; the processor 901 determines the ohmic internal resistance, the polarization internal resistance and the polarization capacitance corresponding to the preset SOC by using an equivalent circuit model according to the initial open-circuit voltage during the charging or discharging process of the battery in the preset time period, and specifically executes the following steps:
determining ohmic internal resistance corresponding to a preset SOC by adopting an equivalent circuit model according to the initial open-circuit voltage in the process of charging or discharging the battery within a preset time period;
determining the polarization internal resistance corresponding to the preset SOC based on the ohm internal resistance;
and determining the polarization capacitor corresponding to the preset SOC based on the polarization internal resistance and the ohm internal resistance.
In some possible embodiments, the battery is charged or discharged at a preset current for the preset time period;
when the processor 901 determines the ohmic internal resistance corresponding to the preset SOC by using the equivalent circuit model according to the initial open-circuit voltage during the charging or discharging process of the battery in the preset time period, the following steps are specifically performed: determining the ohmic internal resistance according to the following formula:
wherein R is0To the ohmic internal resistance,. DELTA.V1Is a first voltage difference value, which is a change value of the voltage of the battery after the battery is charged or discharged with a preset current within a first preset time period, I1The preset current is used; the first preset time period is a part of the preset time period.
In some possible embodiments, when the processor 901 determines the polarization internal resistance corresponding to the preset SOC based on the ohmic internal resistance, specifically performs: determining the polarization internal resistance according to the following formula:
wherein R is1For said internal polarization resistance,. DELTA.V2And the second voltage difference value is a change value of the voltage of the battery after the battery is charged or discharged with a preset current in the preset time period.
In some possible embodiments, when the processor 901 determines the polarization capacitance corresponding to the preset SOC based on the polarization internal resistance and the ohmic internal resistance, specifically: determining the polarization capacitance according to the formula:
wherein, t1To a predetermined battery terminal voltage UtIn correspondence with time t, Ut=OCV-I1R0-0.63I1R1Time corresponding to the time.
In some possible embodiments, the relationship between the battery terminal voltage and the current corresponding to the predetermined SOC is: u shapet=OCV-IR0-U1Wherein I is the current; the above-mentioned t is a charge or discharge time period.
In some possible embodiments, when the processor 901 determines the first electric quantity variation value according to the first SOC and the second SOC, the following steps are specifically performed:
and determining the product of the difference value of the first SOC and the second SOC and the maximum electric quantity of the battery as the first electric quantity change value.
In some possible embodiments, when the processor 901 determines the short-circuit current of the battery in the period to be measured according to the first electric quantity variation value and the second electric quantity variation value, specifically:
and determining the ratio of the difference value of the first electric quantity change value and the second electric quantity change value to the time length of the time period to be measured, and determining the ratio as the short-circuit current of the battery in the time period to be measured.
In some possible embodiments, the processor 901 further performs: and under the condition that the short-circuit current is smaller than a preset difference value, updating the maximum electric quantity of the battery according to the difference value of the first SOC and the second electric quantity change value.
According to the electronic device provided by the embodiment of the application, the theoretical open-circuit voltage of the battery can be calculated through the equivalent circuit model of the battery, the theoretical electric quantity change value of the battery in the charging or discharging process can be calculated according to the theoretical open-circuit voltage, and the short-circuit current of the battery can be obtained according to the theoretical electric quantity change value and the actually measured electric quantity change value. The accuracy of detecting the short-circuit current in the battery can be improved by adopting the equivalent circuit model, and the probability of misjudgment is reduced, so that the safety problem caused by the short circuit of the battery in the electronic equipment can be effectively avoided, and the safety of using the electronic equipment by a user is improved. In addition, the embodiment of the application calculates the open-circuit voltage corresponding to the specific SOC through the equivalent circuit mode, further detects the short-circuit current, has no improvement on a hardware structure, and can be realized only through programming, so that the embodiment of the application can also reduce the hardware cost.
Embodiments of the present application also provide a computer-readable storage medium, which stores instructions that, when executed on a computer or a processor, cause the computer or the processor to perform one or more of the steps in the embodiments shown in fig. 2a to 6. If the above-mentioned components of the battery open-circuit voltage detection device and the short-circuit current detection device are implemented in the form of software functional units and sold or used as independent products, they may be stored in the computer-readable storage medium.
In the above embodiments, the implementation may be wholly or partially realized by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the application to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a network of computers, or other programmable device. The computer instructions may be stored in or transmitted over a computer-readable storage medium. The computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center by wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)), or wirelessly (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., Digital Versatile Disk (DVD)), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and can include the processes of the embodiments of the methods described above when the program is executed. And the aforementioned storage medium includes: various media capable of storing program codes, such as a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk, and an optical disk. The technical features in the present examples and embodiments may be arbitrarily combined without conflict.
The above-described embodiments are merely preferred embodiments of the present application, and are not intended to limit the scope of the present application, and various modifications and improvements made to the technical solutions of the present application by those skilled in the art without departing from the design spirit of the present application should fall within the protection scope defined by the claims of the present application.

Claims (21)

1. A battery open circuit voltage detection method is characterized by comprising the following steps:
in the process that the battery is charged or discharged in a preset time period, according to the initial open-circuit voltage, determining ohmic internal resistance, polarization internal resistance and polarization capacitance corresponding to a preset state of charge (SOC) by adopting an equivalent circuit model;
determining the corresponding relation between the battery terminal voltage and the current according to the ohm internal resistance, the polarization internal resistance and the polarization capacitor:
and determining the open-circuit voltage corresponding to the preset SOC under different currents and battery terminal voltages according to the corresponding relation.
2. The method of claim 1, wherein the equivalent circuit model is a first order Resistance Capacitance (RC) equivalent circuit model; in the process of charging or discharging the battery within a preset time period, according to the initial open-circuit voltage, determining the ohmic internal resistance, the polarization internal resistance and the polarization capacitance corresponding to the preset SOC by adopting an equivalent circuit model, wherein the method comprises the following steps:
determining ohmic internal resistance corresponding to a preset SOC by adopting an equivalent circuit model according to the initial open-circuit voltage in the process of charging or discharging the battery within a preset time period;
determining the polarization internal resistance corresponding to the preset SOC based on the ohm internal resistance;
and determining the polarization capacitor corresponding to the preset SOC based on the polarization internal resistance and the ohm internal resistance.
3. The method of claim 2, wherein the battery is charged or discharged at a preset current for the preset time period;
in the process of charging or discharging the battery within a preset time period, according to the initial open-circuit voltage, determining the ohmic internal resistance corresponding to the preset SOC by adopting an equivalent circuit model, wherein the process comprises the following steps: determining the ohmic internal resistance according to the following formula:
wherein R is0To the ohmic internal resistance,. DELTA.V1Is a first voltage difference value, which is a change value of the voltage of the battery after the battery is charged or discharged with a preset current within a first preset time period, I1The preset current is used; the first preset time period is a part of the preset time period.
4. The method of claim 3, wherein said determining said polarization internal resistance corresponding to said preset SOC based on said ohmic internal resistance comprises: determining the polarization internal resistance according to the following formula:
wherein R is1For said internal polarization resistance,. DELTA.V2And the second voltage difference value is a change value of the voltage of the battery after the battery is charged or discharged with a preset current in the preset time period.
5. The method of claim 4, wherein said determining the polarization capacitance corresponding to the preset SOC based on the polarization internal resistance and the ohmic internal resistance comprises: determining the polarization capacitance according to the formula:
wherein, t1To a predetermined battery terminal voltage UtIn correspondence with time t, Ut=OCV-I1R0-0.63I1R1Time corresponding to the time.
6. The method of claim 5, wherein the relationship between the battery terminal voltage and the current corresponding to the predetermined SOC is as follows: u shapet=OCV-IR0-U1Wherein I is the current; the above-mentionedt is a charge or discharge time period.
7. A short circuit current detection method, comprising:
in the process that the battery is charged or discharged in a preset time period, according to the initial open-circuit voltage, determining ohmic internal resistance, polarization internal resistance and polarization capacitance corresponding to a preset state of charge (SOC) by adopting an equivalent circuit model;
determining a corresponding relation between the battery terminal voltage and the current according to the ohm internal resistance, the polarization internal resistance and the polarization capacitor;
determining open-circuit voltage corresponding to the preset SOC under different currents and battery terminal voltage according to the corresponding relation;
determining a first open-circuit voltage corresponding to the starting time of a period to be measured and a second open-circuit voltage corresponding to the ending time of the period to be measured;
determining a first SOC corresponding to the first open-circuit voltage and a second SOC corresponding to the second open-circuit voltage according to the open-circuit voltage corresponding to the preset SOC under the different currents and the voltage at the battery terminal;
determining a first electric quantity change value according to the first SOC and the second SOC;
calculating a second electric quantity change value of the battery in the period to be measured according to the duration of the period to be measured and the discharge current;
and determining the short-circuit current of the battery in the period to be measured according to the first electric quantity change value and the second electric quantity change value.
8. The method of claim 7, wherein the equivalent circuit model is a first order Resistance Capacitance (RC) equivalent circuit model; in the process of charging or discharging the battery within a preset time period, according to the initial open-circuit voltage, determining the ohmic internal resistance, the polarization internal resistance and the polarization capacitance corresponding to the preset SOC by adopting an equivalent circuit model, wherein the method comprises the following steps:
determining ohmic internal resistance corresponding to a preset SOC by adopting an equivalent circuit model according to the initial open-circuit voltage in the process of charging or discharging the battery within a preset time period;
determining the polarization internal resistance corresponding to the preset SOC based on the ohm internal resistance;
and determining the polarization capacitor corresponding to the preset SOC based on the polarization internal resistance and the ohm internal resistance.
9. The method of claim 8, wherein the battery is charged or discharged at a preset current for the preset period of time;
in the process of charging or discharging the battery within a preset time period, according to the initial open-circuit voltage, determining the ohmic internal resistance corresponding to the preset SOC by adopting an equivalent circuit model, wherein the process comprises the following steps: determining the ohmic internal resistance according to the following formula:
wherein R is0To the ohmic internal resistance,. DELTA.V1Is a first voltage difference value, which is a change value of the voltage of the battery after the battery is charged or discharged with a preset current within a first preset time period, I1The preset current is used; the first preset time period is a part of the preset time period.
10. The method of claim 9, wherein said determining said polarization internal resistance corresponding to said preset SOC based on said ohmic internal resistance comprises: determining the polarization internal resistance according to the following formula:
wherein R is1For said internal polarization resistance,. DELTA.V2And the second voltage difference value is a change value of the voltage of the battery after the battery is charged or discharged with a preset current in the preset time period.
11. The method of claim 10, wherein said determining said polarization capacitance for said preset SOC based on said polarization internal resistance and said ohmic internal resistance comprises: determining the polarization capacitance according to the formula:
wherein, t1To a predetermined battery terminal voltage UtIn correspondence with time t, Ut=OCV-I1R0-0.63I1R1Time corresponding to the time.
12. The method of claim 11, wherein the relationship between the battery terminal voltage and the current corresponding to the predetermined SOC is: u shapet=OCV-IR0-U1Wherein I is the current; the above-mentionedt is a charge or discharge time period.
13. The method of any of claims 7-12, wherein determining a first charge change value based on the first SOC and the second SOC comprises:
and determining the product of the difference value of the first SOC and the second SOC and the maximum electric quantity of the battery as the first electric quantity change value.
14. The method of claim 13, wherein determining the short circuit current of the battery during the period of time to be measured according to the first and second charge change values comprises:
and determining the ratio of the difference value of the first electric quantity change value and the second electric quantity change value to the time length of the time period to be measured, and determining the ratio as the short-circuit current of the battery in the time period to be measured.
15. The method of claim 14, wherein the method further comprises: and under the condition that the short-circuit current is smaller than a preset difference value, updating the maximum electric quantity of the battery according to the difference value of the first SOC and the second electric quantity change value.
16. A battery open circuit voltage detection apparatus, comprising:
the first determining module is used for determining ohmic internal resistance, polarization internal resistance and polarization capacitance corresponding to a preset state of charge (SOC) by adopting an equivalent circuit model according to initial open-circuit voltage in the process of charging or discharging a battery in a preset time interval;
the second determining module is used for determining the corresponding relation between the battery terminal voltage and the current according to the ohm internal resistance, the polarization internal resistance and the polarization capacitor;
and the third determining module is used for determining the open-circuit voltage corresponding to the preset SOC under different currents and the voltage of the battery terminal according to the corresponding relation.
17. A short-circuit current detection device, comprising:
the first determining module is used for determining ohmic internal resistance, polarization internal resistance and polarization capacitance corresponding to a preset state of charge (SOC) by adopting an equivalent circuit model according to initial open-circuit voltage in the process of charging or discharging a battery in a preset time interval;
the second determining module is used for determining the corresponding relation between the battery terminal voltage and the current according to the ohm internal resistance, the polarization internal resistance and the polarization capacitor;
the third determining module is used for determining open-circuit voltages corresponding to the preset SOC under different currents and battery terminal voltages according to the corresponding relation;
the fourth determining module is used for determining a first open-circuit voltage corresponding to the starting time of a period to be measured and a second open-circuit voltage corresponding to the ending time of the period to be measured;
a fifth determining module, configured to determine, according to the different currents and the voltage at the battery terminal, a first SOC corresponding to the first open-circuit voltage and a second SOC corresponding to the second open-circuit voltage, respectively, according to an open-circuit voltage corresponding to the preset SOC;
a sixth determining module, configured to determine a first electric quantity variation value according to the first SOC and the second SOC;
the calculation module is used for calculating a second electric quantity change value of the battery in the period to be measured according to the duration of the period to be measured and the discharge current;
and the seventh determining module is used for determining the short-circuit current of the battery in the period to be measured according to the first electric quantity change value and the second electric quantity change value.
18. A computer storage medium, characterized in that it stores a plurality of instructions adapted to be loaded by a processor and to perform the method steps according to any of claims 1-6.
19. A computer storage medium, characterized in that it stores a plurality of instructions adapted to be loaded by a processor and to perform the method steps according to any of claims 7-15.
20. An electronic device, comprising: a processor and a memory; wherein the memory stores a computer program adapted to be loaded by the processor and to perform the method steps according to any of claims 1-6.
21. An electronic device, comprising: a processor and a memory; wherein the memory stores a computer program adapted to be loaded by the processor and to perform the method steps of any of claims 7-15.
CN202011453518.2A 2020-12-11 2020-12-11 Short-circuit current detection method and device, readable storage medium and electronic equipment Pending CN112698229A (en)

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CN202011453518.2A CN112698229A (en) 2020-12-11 2020-12-11 Short-circuit current detection method and device, readable storage medium and electronic equipment

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011453518.2A CN112698229A (en) 2020-12-11 2020-12-11 Short-circuit current detection method and device, readable storage medium and electronic equipment

Publications (1)

Publication Number Publication Date
CN112698229A true CN112698229A (en) 2021-04-23

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Family Applications (1)

Application Number Title Priority Date Filing Date
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Country Link
CN (1) CN112698229A (en)

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