CN117169752A - Circuit parameter calculation method, battery equivalent circuit and storage battery - Google Patents

Circuit parameter calculation method, battery equivalent circuit and storage battery Download PDF

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Publication number
CN117169752A
CN117169752A CN202311134313.1A CN202311134313A CN117169752A CN 117169752 A CN117169752 A CN 117169752A CN 202311134313 A CN202311134313 A CN 202311134313A CN 117169752 A CN117169752 A CN 117169752A
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voltage
abrupt
discharge
point
section
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Inventor
李洪波
林望青
李泽彬
吴锦珊
张亚辉
胡景桐
杨晓燕
郑晓君
陈涛
郑绍鸿
谢遴嘉
马永春
眭晓飞
彭细近
赵小宾
林佳润
陈群丽
陈琳
林捷
陈建东
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Guangdong Power Grid Co Ltd
Shantou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Guangdong Power Grid Co Ltd
Shantou Power Supply Bureau of Guangdong Power Grid Co Ltd
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Priority to CN202311134313.1A priority Critical patent/CN117169752A/en
Publication of CN117169752A publication Critical patent/CN117169752A/en
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Abstract

The invention discloses a circuit parameter calculation method, a battery equivalent circuit and a storage battery. And screening out the mutation points of the discharge voltage rising section and the mutation points of the discharge voltage falling section from the discharge voltage current curve, and calculating circuit parameters according to the mutation points of the charge voltage rising section, the mutation points of the charge voltage falling section, the mutation points of the discharge voltage rising section, the mutation points of the discharge voltage falling section and the charge and discharge current, wherein the circuit parameters comprise the resistance value of an ohmic resistor, the resistance value of a polarization resistor, the voltage of an ideal voltage source, the resistance value of a dispersion internal resistance and the capacitance value of a polarization capacitor. According to the method, the charging and discharging current is used for replacing a part of circuit parameters calculated by the self-discharging current, so that the problem that the parameter calculation has larger deviation due to the internal resistance voltage drop can be solved, and the electric quantity of the battery can be estimated more accurately.

Description

Circuit parameter calculation method, battery equivalent circuit and storage battery
Technical Field
The present application relates to the field of battery circuits, and in particular, to a circuit parameter calculation method, a battery equivalent circuit, and a storage battery.
Background
The battery cell is an infrastructure forming a large battery energy storage system, and the battery management system needs to monitor the electrical parameters of all the single batteries in the energy storage system in real time and dynamically simulate and estimate the battery state of the battery energy storage system based on the monitored parameters. To better demonstrate the electrochemical parameter characteristics of the battery, a physical circuit model is built for the battery, and the battery is generally considered to be equivalent to a circuit of an ideal power supply and impedance parameter combination according to the port characteristics of the battery. The accurate battery model is important to improve the accuracy of battery parameter acquisition and state evaluation, and the existing common battery model comprises a Rint model shown in fig. 1 and a first-order RC network model shown in fig. 2, namely a Thevenin model.
The above-mentioned existing battery equivalent circuit model has the following two problems, the first problem is that under the long-term standing state of the battery, namely, the open state of the battery, the battery is internally self-discharged to cause the gradual reduction of the battery electric quantity, the battery voltage is gradually reduced, and the continuous self-discharge of the battery causes the gradual expansion of the error of the model calculation result. If the intelligent calculation method is used for compensation, the calculated amount and the data storage amount of the battery management system are greatly increased, and the real-time management of the battery system is not facilitated. The second problem is that the internal resistance of the battery is inversely related to the ambient temperature, the existing battery equivalent circuit model has a positive correlation relationship based on the battery voltage and the battery electric quantity, and the accuracy of evaluating the battery electric quantity is low.
In summary, the existing battery equivalent circuit model has the problems that the continuous self-discharge of the battery leads to gradual expansion of the error of the model calculation result and lower accuracy of the battery electric quantity evaluation.
Disclosure of Invention
The application aims at: a circuit parameter calculation method, a battery equivalent circuit and a storage battery are provided, so that the problems that an error of a model calculation result is gradually enlarged and the accuracy of evaluating the electric quantity of the battery is lower due to the fact that the battery is continuously self-discharged in the existing battery equivalent circuit model are solved.
To achieve the above object, in a first aspect, an embodiment of the present application provides a circuit parameter calculation method, including:
acquiring a charging voltage current curve and a discharging voltage current curve;
screening out abrupt points of a charging voltage rising section and abrupt points of a charging voltage falling section from the charging voltage current curve;
screening out abrupt points of a discharge voltage rising section and abrupt points of a discharge voltage falling section from the discharge voltage current curve;
and calculating circuit parameters according to the abrupt change point of the charging voltage rising section, the abrupt change point of the charging voltage falling section, the abrupt change point of the discharging voltage rising section, the abrupt change point of the discharging voltage falling section and the charging and discharging current, wherein the circuit parameters comprise the resistance value of an ohmic resistor, the resistance value of a polarization resistor, the voltage of an ideal voltage source, the resistance value of a dispersion internal resistance and the capacitance value of a polarization capacitor.
Preferably, the calculating circuit parameters according to the abrupt point of the charging voltage rising section, the abrupt point of the charging voltage falling section, the abrupt point of the discharging voltage rising section, the abrupt point of the discharging voltage falling section, and the charging and discharging current include:
acquiring battery open-circuit voltage, battery discharge electric quantity and discharge time;
calculating the ratio of the battery discharge electric quantity to the discharge time to obtain a self-discharge current;
and calculating the ratio of the open-circuit voltage of the battery to the self-discharge current to obtain the resistance value of the dispersed internal resistance.
Preferably, the calculating circuit parameters according to the abrupt point of the charging voltage rising section, the abrupt point of the charging voltage falling section, the abrupt point of the discharging voltage rising section, the abrupt point of the discharging voltage falling section, and the charging and discharging current include:
calculating a difference value between the voltage of the first abrupt change point of the charging voltage rising section and the voltage of the first abrupt change point of the discharging voltage falling section to obtain a first voltage difference value; calculating the ratio of the first voltage difference value to 2 times of the charge-discharge current to obtain the resistance value of the ohmic internal resistance;
calculating the difference value between the voltage of the first abrupt change point of the charging voltage falling section and the voltage of the first abrupt change point of the discharging voltage rising section to obtain a second voltage difference value; calculating the ratio of the second voltage difference value to 2 times of the charge-discharge current to obtain the resistance value of the polarization resistor;
The voltage of the ideal voltage source is calculated by the following formula:
U O ＝(R P +R O-NTC )·i s +U I ；
wherein R is P R is the resistance of the polarization resistor O-NTC I is the resistance value of the ohmic internal resistance s For the self-discharge current, U I Open circuit voltage for the battery;
the capacitance value of the polarization capacitor is calculated by the following formula:
wherein C is P T is the capacitance value of the polarized capacitor DE For the duration of the discharge voltage rising period, R P In order to obtain the resistance value of the polarization resistor, ln is a logarithmic function taking a natural constant as a base,for the voltage at the first abrupt point of the charging voltage drop section,/>for the voltage of the first abrupt point of the discharge voltage rising section, +.>And the voltage of the second abrupt point of the discharge voltage rising section.
Preferably, the calculating circuit parameters according to the abrupt point of the charging voltage rising section, the abrupt point of the charging voltage falling section, the abrupt point of the discharging voltage rising section, the abrupt point of the discharging voltage falling section, and the charging and discharging current include:
calculating the difference value between the voltage of the second abrupt change point of the discharge voltage dropping section and the voltage of the first abrupt change point of the discharge voltage dropping section to obtain a third voltage difference value;
calculating the ratio of the third voltage difference value to the charge-discharge current to obtain the resistance value of the ohmic resistor;
Calculating the difference value between the voltage of the first abrupt change point of the charging voltage falling section and the voltage of the first abrupt change point of the discharging voltage rising section to obtain a second voltage difference value; calculating the ratio of the second voltage difference value to 2 times of the charge-discharge current to obtain the resistance value of the polarization resistor;
calculating the voltage of the ideal voltage source according to the following formula:
U O ＝R P ·i s +U I ；
wherein R is P I is the resistance of the polarization resistor s For the self-discharge current, U I Open circuit voltage for the battery;
the capacitance value of the polarization capacitor is calculated by the following formula:
wherein C is P T is the capacitance value of the polarized capacitor DE For the duration of the discharge voltage rising period, R P In order to obtain the resistance value of the polarization resistor, ln is a logarithmic function taking a natural constant as a base,for the voltage of the first abrupt point of the charging voltage drop section, +.>For the voltage of the first abrupt point of the discharge voltage rising section, +.>And the voltage of the second abrupt point of the discharge voltage rising section.
Preferably, the calculating circuit parameters according to the abrupt point of the charging voltage rising section, the abrupt point of the charging voltage falling section, the abrupt point of the discharging voltage rising section, the abrupt point of the discharging voltage falling section, and the charging and discharging current include:
Calculating the difference value between the voltage of the second abrupt change point of the discharge voltage dropping section and the voltage of the first abrupt change point of the discharge voltage dropping section to obtain a third voltage difference value;
calculating the ratio of the third voltage difference value to the charge-discharge current to obtain the resistance value of the ohmic resistor;
calculating the difference value between the voltage of the second abrupt change point of the discharge voltage rising section and the voltage of the first abrupt change point of the discharge voltage rising section to obtain a fourth voltage difference value;
calculating the ratio of the fourth voltage difference value to the charge-discharge current to obtain the resistance value of the polarization resistor;
calculating the voltage of the ideal voltage source according to the following formula:
wherein U is O For the voltage of the ideal voltage source,a voltage at a second abrupt point of the discharge voltage drop section;
the capacitance value of the polarization capacitor is calculated by the following formula:
wherein C is P T is the capacitance value of the polarized capacitor DE For the duration of the discharge voltage rising period, R P For the resistance value of the polarization resistor, ln is a logarithmic function based on natural constant, U O For the voltage of the ideal voltage source,for the voltage of the first abrupt point of the discharge voltage rising section, +. >And the voltage of the second abrupt point of the discharge voltage rising section.
In a second aspect, an embodiment of the present invention provides a battery equivalent circuit, which is applied to the circuit parameter calculation method described in any one of the above, where the circuit includes an ideal voltage source, a polarization resistor, and a polarization capacitor; the first end of the polarization resistor is electrically connected to the first end of the polarization capacitor, and the second end of the polarization resistor is electrically connected to the second end of the polarization capacitor; the positive electrode of the ideal voltage source is electrically connected to the first end of the polarization resistor, and the negative electrode of the ideal voltage source is electrically connected to the negative electrode of the charging power supply or the negative electrode of the load; the second end of the polarization resistor is electrically connected to the first end of a first resistor, the second end of the first resistor is electrically connected to the positive electrode of the charging power supply or the positive electrode of the load, and the first resistor is an ohmic internal resistance or an ohmic resistance.
Preferably, the battery equivalent circuit further comprises a dispersed internal resistance, the second end of the polarization resistor is electrically connected to the first end of the ohmic internal resistance, the second end of the ohmic internal resistance is electrically connected to the first end of the dispersed internal resistance, and the second end of the dispersed internal resistance is electrically connected to the negative electrode of the ideal voltage source.
Preferably, the battery equivalent circuit further comprises a dispersed internal resistance, the second end of the polarization resistor is electrically connected to the first end of the ohmic resistor, and the second end of the ohmic resistor is electrically connected to the positive electrode of the charging power supply or the positive electrode of the load; the first end of the ohmic resistor is electrically connected to the first end of the dispersed internal resistance, and the second end of the dispersed internal resistance is electrically connected to the negative electrode of the ideal voltage source.
Preferably, the battery equivalent circuit further comprises a dispersed internal resistance, the second end of the polarization resistor is electrically connected to the first end of the ohmic resistor, and the second end of the ohmic resistor is electrically connected to the positive electrode of the charging power supply or the positive electrode of the load; the first end of the dispersed internal resistance is electrically connected to the positive electrode of the ideal voltage source, and the second end of the dispersed internal resistance is electrically connected to the negative electrode of the ideal voltage source.
In a third aspect, an embodiment of the present invention provides a storage battery, including a battery equivalent circuit as described in any one of the above.
The circuit parameter calculation method provided by the embodiment of the invention comprises the steps of obtaining a charging voltage current curve and a discharging voltage current curve, and screening out abrupt points of a charging voltage rising section and an abrupt point of a charging voltage falling section from the charging voltage current curve. And screening the abrupt points of the discharge voltage rising section and the abrupt points of the discharge voltage falling section from the discharge voltage current curve. The charging voltage current curve and the discharging voltage current curve are obtained based on a battery charging and discharging combination mode, and circuit parameters are calculated according to the mutation point of a charging voltage rising section, the mutation point of a charging voltage falling section, the mutation point of a discharging voltage rising section, the mutation point of a discharging voltage falling section and the charging and discharging current, wherein the circuit parameters comprise the resistance value of an ohmic resistor, the resistance value of a polarization resistor, the voltage of an ideal voltage source and the capacitance value of a polarization capacitor. The magnitude of the self-discharge current is directly related to the ambient temperature and the aging degree of the battery, and the method uses the charge-discharge current to replace a part of circuit parameters of the self-discharge current, so that the charge-discharge current is less influenced by the ambient temperature and the aging degree of the battery, and the problem that the parameter calculation has larger deviation due to the pre-charge of the polarized capacitor caused by the self-discharge and the internal resistance voltage drop caused by the self-discharge current in the model can be effectively solved, thereby more accurately evaluating the electric quantity of the battery.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a first flowchart of a circuit parameter calculation method according to an embodiment of the invention;
FIG. 2 is a second flowchart of a circuit parameter calculation method according to a second embodiment of the present invention;
FIG. 3 is a graph illustrating a charge voltage and current curve according to an embodiment of the present invention;
FIG. 4 is a graph showing a discharge voltage and current curve according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a first structure of a battery equivalent circuit according to an embodiment of the present invention;
fig. 6 is a second schematic structural diagram of a battery equivalent circuit according to an embodiment of the present invention;
Fig. 7 is a schematic diagram of a third structure of a battery equivalent circuit according to an embodiment of the present invention;
FIG. 8 is a graph of open circuit voltage versus battery charge provided by an embodiment of the present invention;
fig. 9 is a graph of open circuit voltage versus rest time for a battery according to an embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a first flowchart of a circuit parameter calculation method according to an embodiment of the present invention, where the embodiment is applicable to a case of calculating a circuit parameter of a battery equivalent circuit model, and the circuit parameter calculation method may be implemented by a battery equivalent circuit. As shown in fig. 1, the circuit parameter calculation method includes:
s10: and acquiring a charging voltage current curve and a discharging voltage current curve.
Referring to fig. 3, when the battery is in a charged state, the power supply U S To an ideal voltage source, ohmic internal resistance R o-NTC Polarization resistance R p And a dispersion internal resistance R s-NTC The circuit network is used for supplying power to realize battery chargingAnd (5) electricity.
The horizontal axis of the charge voltage current curve is charge time, and the vertical axis is battery voltage and charge current. The horizontal axis of the discharge voltage current curve represents discharge time, and the vertical axis represents battery voltage and discharge current.
After the battery starts to charge, power supply U S And the ideal voltage source of the battery is charged by constant charge-discharge current I, and the tailing phenomenon exists after the voltage of the battery rises suddenly. When the ideal voltage source of the battery starts discharging, the load R L The voltage of the ideal voltage source of the battery drops at the moment of discharging at a constant charge-discharge current I.
S11: and screening out the abrupt change points of the charging voltage rising section and the abrupt change points of the charging voltage falling section from the charging voltage current curve.
Referring to FIG. 3, after a period of charging, the voltage of the ideal voltage source will generate a sudden change, the charging voltage rising section has two sudden change points, the first sudden change point of the charging voltage rising section is the point for starting sudden change of rising, denoted A c The second abrupt point of the charging voltage rising section is the point at which the rising abrupt is ended, denoted as B c . During the charging process, the voltage of the ideal voltage source has a tail after rising suddenly, and the voltage of the ideal voltage source is increased from the maximum value C c A down mutation is generated. The first abrupt point of the charging voltage drop section is the point at which the drop abrupt change ends, denoted as D c The second abrupt point of the charging voltage drop section is the trailing point after the drop abrupt, denoted E c 。
S12: and screening out abrupt points of the discharge voltage rising section and abrupt points of the discharge voltage falling section from the discharge voltage current curve.
Referring to fig. 4, an access load R L Then, the ideal voltage source charges and discharges the current I to the load R L The voltage of the ideal voltage source can generate a drop mutation, the drop section of the discharge voltage has two mutation points, the first mutation point of the drop section of the discharge voltage is the point for starting the drop mutation, and is expressed as A d The second abrupt point of the discharge voltage drop section is the point at which the drop abrupt change ends, tableShown as B d . During the discharge, the voltage of the ideal voltage source is changed from the minimum value C along with the extension of the discharge time after the voltage of the ideal voltage source is suddenly changed d An ascending mutation is generated. The first abrupt point of the discharge voltage rising section is the point at which the rising abrupt is ended, denoted as D d The second abrupt point of the discharge voltage rising section is the trailing point after the rising abrupt, denoted E d 。
S13: and calculating circuit parameters according to the abrupt change point of the charging voltage rising section, the abrupt change point of the charging voltage falling section, the abrupt change point of the discharging voltage rising section, the abrupt change point of the discharging voltage falling section and the charging and discharging current, wherein the circuit parameters comprise the resistance value of an ohmic resistor, the resistance value of a polarization resistor, the voltage of an ideal voltage source, the resistance value of a dispersion internal resistance and the capacitance value of a polarization capacitor.
The resistance of the ohmic resistor, the resistance of the polarization resistor, the resistance of the voltage of the ideal voltage source and the resistance of the dispersion internal resistance can be calculated by simple operations such as addition, subtraction and division on the abrupt point of the charging voltage rising section, the abrupt point of the charging voltage falling section, the abrupt point of the discharging voltage rising section, the abrupt point of the discharging voltage falling section and the charging and discharging current I, and the operation efficiency is high.
The current during charging and the current during discharging are both charging and discharging current I, the charging and discharging current I replaces the self-discharging current to calculate the circuit parameters, and the charging and discharging current is less influenced by the ambient temperature and the aging degree of the battery.
The circuit parameter calculation method provided by the embodiment of the invention comprises the steps of obtaining a charging voltage current curve and a discharging voltage current curve, and screening out abrupt points of a charging voltage rising section and abrupt points of a charging voltage falling section from the charging voltage current curve. And screening the abrupt points of the discharge voltage rising section and the abrupt points of the discharge voltage falling section from the discharge voltage current curve. The charging voltage current curve and the discharging voltage current curve are obtained based on a battery charging and discharging combination mode, and circuit parameters are calculated according to the mutation point of a charging voltage rising section, the mutation point of a charging voltage falling section, the mutation point of a discharging voltage rising section, the mutation point of a discharging voltage falling section and the charging and discharging current I, wherein the circuit parameters comprise the resistance value of an ohmic resistor, the resistance value of a polarization resistor, the voltage of an ideal voltage source and the capacitance value of a polarization capacitor. The magnitude of the self-discharge current is directly related to the ambient temperature and the aging degree of the battery, and the method uses the charge-discharge current I to replace the self-discharge current to calculate the circuit parameters, so that the charge-discharge current is less influenced by the ambient temperature and the aging degree of the battery, and the problem that the parameter calculation has larger deviation due to the pre-charge of the polarized capacitor caused by self-discharge and the internal resistance voltage drop caused by the self-discharge current in the model can be effectively solved, thereby more accurately evaluating the electric quantity of the battery.
Example two
Fig. 2 is a second flowchart of a circuit parameter calculation method according to a second embodiment of the present invention, which refines the circuit parameter calculation method according to the first embodiment of the present invention.
The circuit parameter calculation method of the second embodiment of the present invention is based on the battery equivalent circuit shown in fig. 5, and fig. 5 is a first structural schematic diagram of the battery equivalent circuit provided by the embodiment of the present invention. The equivalent circuit of the battery comprises an ideal voltage source and a polarization resistor R p And polarization capacitor C p The method comprises the steps of carrying out a first treatment on the surface of the Polarization resistor R p Is electrically connected to the polarized capacitor C p Polarization resistance R p Is electrically connected to the polarized capacitor C p Is a second end of (2); the positive electrode of the ideal voltage source is electrically connected to the polarization resistor R p The negative pole of the ideal voltage source is electrically connected to the charging power supply U s Or load R of (2) L Is a negative electrode of (a); polarization resistor R p Is electrically connected to the first end of the first resistor, and the second end of the first resistor is electrically connected to the charging power supply U s Positive electrode or load R of (2) L The first resistance is the ohmic internal resistance R o-NTC Or ohmic resistance R ot 。
The first resistance is ohmic internal resistance R o-NTC The battery equivalent circuit also comprises a dispersion internal resistance R s-NTC Polarization resistance R p Is electrically connected to the ohmic internal resistance R o-NTC Ohmic internal resistance R o-NTC Is a second end of (2)Electrically connected to the dispersed internal resistance R s-NTC Is a first end of the dispersion internal resistance R s-NTC Is electrically connected to the negative pole of the desired voltage source. U (U) 1 For charging power supply U s Or the load R L The voltage across it.
Ohmic internal resistance R when charging an ideal voltage source of a battery o-NTC Is electrically connected to the charging power supply U s Is a positive electrode of (a); when the ideal voltage source of the battery is used for the load R L Ohmic internal resistance R during discharge o-NTC Is electrically connected to the load R L Is a positive electrode of (a).
As shown in fig. 2, the circuit parameter calculating method provided in the second embodiment of the present invention includes:
s20: and acquiring a charging voltage current curve and a discharging voltage current curve.
Referring to fig. 3, when the battery is in a charged state, the power supply U S To an ideal voltage source, ohmic internal resistance R o-NTC Polarization resistance R p And a dispersion internal resistance R s-NTC The circuit network is used for supplying power to realize the charging of the battery.
The horizontal axis of the charge voltage current curve is charge time, and the vertical axis is battery voltage and charge current. The horizontal axis of the discharge voltage current curve represents discharge time, and the vertical axis represents battery voltage and discharge current.
Ohmic internal resistance R of battery o-NTC The voltage of the ideal voltage source is suddenly increased at the initial stage of battery charging, and the battery is always self-discharged in a static state. Therefore, the polarization capacitor C of the battery equivalent circuit p Always in shallow charge state, and polarized capacitor C p The voltage at the two ends is positive and negative. Due to polarization capacitance C p The voltage at the two ends cannot be suddenly changed, so that after the battery starts to charge, the charging power supply U s And charging the ideal voltage source with constant charge-discharge current I, wherein the tailing phenomenon exists after the voltage of the ideal voltage source rises suddenly.
S21: and screening out the abrupt change points of the charging voltage rising section and the abrupt change points of the charging voltage falling section from the charging voltage current curve.
Step S21 of the second embodiment of the present invention is the same as step S11 of the first embodiment of the present invention, and will not be described here again.
S22: and screening out abrupt points of the discharge voltage rising section and abrupt points of the discharge voltage falling section from the discharge voltage current curve.
Step S22 of the second embodiment of the present invention is the same as step S12 of the first embodiment of the present invention, and will not be described here again.
S23: and obtaining the open-circuit voltage, the discharge electric quantity and the discharge time of the battery.
Referring to FIG. 8, the battery open circuit voltage U is known from the corresponding relationship curve of the battery open circuit voltage and the battery charge of the battery at room temperature I Has one-to-one correspondence with the battery power, so that the following open-circuit voltage U can be fitted I Relationship with battery power:
Wherein SOC is the battery power, U I Is the open circuit voltage of the power supply,is a mapping function of open circuit voltage and battery charge.
The relation reflects the open circuit voltage U I Relationship with battery charge, the inverse of which reflects battery charge and open circuit voltage U I Is a relationship of (3).
Referring to fig. 9, the relationship between the battery open circuit voltage and the rest time at room temperature is:
the relation reflects the open circuit voltage U I Relationship to time.
Will reflect the open circuit voltage U I Substitution of the relation with time reflects the open circuit voltage U I The relation with the battery electric quantity to obtain the battery electric quantity SOC in a standing state s At any timeThe change conditions are as follows:
SOCs(t)＝f SOC (t)；
wherein SOCs (t) is the battery power at time t, f SOC And (t) is the discharge capacity of the battery at the moment t.
S24: and calculating the ratio of the battery discharge electric quantity to the discharge time to obtain the self-discharge current.
The battery charge is equal to the self-discharge current multiplied by the discharge time according to the definition of the battery charge, and thus, the self-discharge current i s The battery discharge capacity divided by the discharge time. The self-discharge current is calculated by the following formula:
wherein i is s Is self-discharge current, t is battery discharge time, f SOC And (t) is the battery discharge amount generated during the battery discharge time t.
S25: and calculating the ratio of the open-circuit voltage of the battery to the self-discharge current to obtain the resistance value of the dispersed internal resistance.
Internal resistance of dispersion R s-NTC The resistance of (2) is:
wherein R is s-NTC To disperse internal resistance, U I Is the open circuit voltage, i s Is a self-discharge current.
S26: calculating a difference value between the voltage of the first abrupt change point of the charging voltage rising section and the voltage of the first abrupt change point of the discharging voltage falling section to obtain a first voltage difference value; and calculating the ratio of the first voltage difference value to 2 times of the charge-discharge current to obtain the resistance value of the ohmic internal resistance.
Referring to fig. 3 and 4, the first abrupt point of the charging voltage rising section is B c The first abrupt point of the discharge voltage drop section is B d The resistance of the ohmic internal resistance is calculated by the following formula:
wherein R is O-NTC Is the resistance value of the ohmic internal resistance,the first voltage difference is I, and I is charge-discharge current.
S27: calculating the difference value between the voltage of the first abrupt change point of the charging voltage falling section and the voltage of the first abrupt change point of the discharging voltage rising section to obtain a second voltage difference value; and calculating the ratio of the second voltage difference value to 2 times of the charge-discharge current to obtain the resistance value of the polarization resistor.
Referring to fig. 3 and 4, the first abrupt point of the charging voltage drop section is D c The first abrupt point of the discharge voltage rising section is D d 。
The formula for calculating the resistance value of the polarization resistor is as follows:
wherein R is P The resistance value of the polarization resistor is I is charge-discharge current,for the voltage of the first abrupt point of the charging voltage drop section, +.>Is the voltage at the first abrupt point of the discharge voltage rising section.
S28: the voltage of the ideal voltage source is calculated.
When the battery is in an open state, the inside of the battery continuously carries out slow self-discharge, and the equivalent polarization capacitor C is in a stable state p No current, ohmic internal resistance R in battery equivalent circuit o-NTC Internal resistance R of dispersion s-NTC Polarization resistance R p The ideal voltage source is divided, and the actual measured value of the external equipment when measuring the battery voltage is the dispersed internal resistance R in the equivalent circuit s-NTC Open circuit voltage U across I . Thus, the voltage across the ideal voltage source is:
U o ＝(R P +R O-NTC )·i s +U I ；
wherein U is o R is the voltage across the ideal voltage source P For polarization resistance, R O-NTC Is ohmic internal resistance, i s For self-discharge current, U I Is an open circuit voltage.
S29: and calculating the capacitance value of the polarized capacitor.
During the charge and discharge of the battery, the voltage change of the ideal voltage source is due to the polarization capacitor C after the battery is charged and discharged until the battery is stabilized p The stored energy gradually goes to the polarization resistor R p The discharge is performed, and this process can be regarded as a zero input response process. Can set the starting point D of voltage recovery after the pulse discharge is finished d The response start is entered at zero.
The capacitance value of the polarized capacitor is calculated by the following formula:
wherein C is P Capacitance value t of polarized capacitor DE For the duration of the discharge voltage rising period, R P In order to obtain the resistance value of the polarization resistor, ln is a logarithmic function taking a natural constant as a base,for the voltage of the first abrupt point of the charging voltage drop section, +.>For the voltage of the first abrupt point of the discharge voltage rising section, +.>And the voltage of the second abrupt point of the discharge voltage rising section.
According to the circuit parameter calculation method provided by the second embodiment of the invention, the difference value between the voltage of the first mutation point of the charging voltage rising section and the voltage of the first mutation point of the discharging voltage falling section is calculated, so that a first voltage difference value is obtained; and calculating the ratio of the first voltage difference value to 2 times of the charge-discharge current to obtain the resistance value of the ohmic internal resistance. And calculating the voltage of the ideal voltage source through the resistance value of the polarization resistor, the resistance value of the ohmic internal resistance, the self-discharge current and the open-circuit voltage of the battery. And calculating the capacitance value of the polarized capacitor according to the duration time of the discharge voltage rising section, the resistance value of the polarized resistor, the voltage of the first mutation point of the charge voltage falling section, the voltage of the first mutation point of the discharge voltage rising section and the voltage of the second mutation point of the discharge voltage rising section. The resistance of the ohmic internal resistance and the resistance of the polarization resistor are calculated by adopting charge-discharge current, so that the problems that the polarization capacitor is precharged due to self-discharge of the storage battery and the parameter calculation has larger deviation due to internal resistance drop caused by the self-discharge current can be effectively solved, and the state of charge and the state of health of the storage battery can be estimated more accurately.
Example III
The third embodiment of the present invention refines the circuit parameter calculation method in the first embodiment of the present invention, and the third embodiment of the present invention and the second embodiment of the present invention are parallel technical solutions.
The circuit parameter calculation method of the third embodiment of the present invention is based on the battery equivalent circuit shown in fig. 6, and fig. 6 is a second schematic structural diagram of the battery equivalent circuit according to the embodiment of the present invention. The equivalent circuit of the battery comprises an ideal voltage source and a polarization resistor R p And polarization capacitor C p The method comprises the steps of carrying out a first treatment on the surface of the Polarization resistor R p Is electrically connected to the polarized capacitor C p Polarization resistance R p Is electrically connected to the polarized capacitor C p Is a second end of (2); the positive electrode of the ideal voltage source is electrically connected to the polarization resistor R p The negative pole of the ideal voltage source is electrically connected to the charging power supply U s Or load R of (2) L Is a negative electrode of (a); polarization ofResistor R p Is electrically connected to the first end of the first resistor, and the second end of the first resistor is electrically connected to the charging power supply U s Positive electrode or load R of (2) L The first resistance is the ohmic internal resistance R o-NTC Or ohmic resistance R ot 。
The first resistor is ohmic resistor R ot The battery equivalent circuit also comprises a dispersion internal resistance R s-NTC Polarization resistance R p Is electrically connected to ohmic resistor R ot Ohmic resistance R ot Is electrically connected to the charging power supply U s Positive electrode or load R of (2) L Is a positive electrode of (a); ohmic resistor R ot Is electrically connected to the dispersed internal resistance R s-NTC Is a first end of the dispersion internal resistance R s-NTC Is electrically connected to the negative pole of the desired voltage source.
Ohmic resistor R when charging an ideal voltage source of the battery ot Is electrically connected to the charging power supply U s Is a positive electrode of (a); when the ideal voltage source of the battery is used for the load R L Ohmic resistance R during discharge ot Is electrically connected to the load R L Is a positive electrode of (a). U (U) 1 For charging power supply U s Or the load R L The voltage across it.
The circuit parameter calculation method provided by the third embodiment of the invention comprises the following steps:
s30: and acquiring a charging voltage current curve and a discharging voltage current curve.
Step S30 of the third embodiment of the present invention is the same as step S20 of the second embodiment of the present invention, and will not be described here again.
S31: and screening out the abrupt change points of the charging voltage rising section and the abrupt change points of the charging voltage falling section from the charging voltage current curve.
Step S31 of the third embodiment of the present invention is the same as step S21 of the second embodiment of the present invention, and will not be described here again.
S32: and screening out abrupt points of the discharge voltage rising section and abrupt points of the discharge voltage falling section from the discharge voltage current curve.
Step S32 of the third embodiment of the present invention is the same as step S22 of the second embodiment of the present invention, and will not be described here again.
S33: and calculating the difference value between the voltage of the second abrupt change point of the discharge voltage dropping section and the voltage of the first abrupt change point of the discharge voltage dropping section to obtain a third voltage difference value.
Referring to FIG. 4, a second point of mutation of the discharge voltage drop section is denoted as A d The first point of the discharge voltage drop is denoted as B d The third voltage difference is expressed as
S34: and calculating the ratio of the third voltage difference value to the charge-discharge current to obtain the resistance value of the ohmic resistor.
The resistance of the ohmic resistor was calculated by the following formula:
wherein R is ot Is the resistance value of the ohmic resistor,for the voltage of the second abrupt point of the discharge voltage drop section, +.>The voltage of the first abrupt point of the discharge voltage drop section is I, and the charge-discharge current.
S35: calculating the difference value between the voltage of the first abrupt change point of the charging voltage falling section and the voltage of the first abrupt change point of the discharging voltage rising section to obtain a second voltage difference value; and calculating the ratio of the second voltage difference value to 2 times of the charge-discharge current to obtain the resistance value of the polarization resistor.
Referring to fig. 3 and 4, the first point of mutation of the charging voltage drop section is denoted as D c The first point of mutation of the discharge voltage rising section is denoted as D d . The resistance of the polarization resistor is calculated by the following formula:
wherein R is P For the resistance value of the polarization resistor,for the voltage of the first abrupt point of the charging voltage drop section, +.>For the voltage of the first abrupt point of the discharge voltage rising section, +.>And I is a charging and discharging current.
S36: the voltage of the ideal voltage source is calculated.
When the battery is in an open state, the internal part of the battery continuously carries out slow self-discharge, and the equivalent polarization capacitor C in a stable state p No current, equivalent to an open circuit. Due to the Euhm resistor R in the battery equivalent circuit ot Contains the equivalent value of the contact resistance of the battery connection, and therefore the ohmic resistance R ot In an open state. At this time, the equivalent circuit can be simplified into an ideal voltage source and a dispersed internal resistance R s-NTC Internal resistance of polarization R p And (3) connecting in series. At this time, the actual measured value of the external device when measuring the battery voltage is the dispersed internal resistance R in the equivalent circuit s-NTC Voltage U at both ends I 。
The voltage across the ideal voltage source is calculated by the following formula:
U O ＝R P ·i s +U I ；
wherein U is O R is the voltage across the ideal voltage source P I is the resistance of the polarization resistor s For self-discharge current, U I Is an open circuit voltage.
S37: and calculating the capacitance value of the polarized capacitor.
During the charging and discharging of the battery, the battery is chargedThe voltage change of the ideal voltage source is caused by the polarization capacitor C after discharge until the stabilization process p The stored energy gradually goes to the polarization resistor R p The discharge is performed, and this process can be regarded as a zero input response process. Can set the starting point D of voltage recovery after the pulse discharge is finished d The response start is entered at zero.
The capacitance value of the polarized capacitor is calculated by the following formula:
wherein C is P Capacitance value t of polarized capacitor DE For the duration of the discharge voltage rising period, R P In order to obtain the resistance value of the polarization resistor, ln is a logarithmic function based on a natural constant,to charge the voltage at the first abrupt point of the voltage drop segment,for the voltage of the first abrupt point of the discharge voltage rising section, +.>The voltage at the second abrupt point of the discharge voltage rising section.
As described above, the circuit parameter calculating method provided in the third embodiment of the present invention includes calculating a difference between the voltage at the second abrupt point of the discharge voltage drop section and the voltage at the first abrupt point of the discharge voltage drop section, to obtain a third voltage difference. And calculating the ratio of the third voltage difference value to the charge-discharge current to obtain the resistance value of the ohmic resistor. And calculating the difference value between the voltage of the first abrupt change point of the charging voltage falling section and the voltage of the first abrupt change point of the discharging voltage rising section to obtain a second voltage difference value. And calculating the ratio of the second voltage difference value to 2 times of the charge-discharge current to obtain the resistance value of the polarization resistor. The resistance of the ohmic internal resistance and the resistance of the polarization resistor are calculated by adopting charge-discharge current, so that the problem that the parameter calculation has larger deviation due to the pre-charge of the polarization capacitor caused by the self-discharge of the storage battery and the internal resistance voltage drop caused by the self-discharge current can be effectively solved. The power equivalent circuit based on the third embodiment of the invention is different from the power equivalent circuit based on the second embodiment of the invention, and provides another calculation mode of the power equivalent circuit and circuit parameters, thereby widening the application range in actual scenes.
Example IV
The fourth embodiment of the present invention refines the circuit parameter calculation method in the first embodiment of the present invention, and the fourth embodiment of the present invention, the second embodiment of the present invention, and the third embodiment of the present invention are parallel technical solutions.
The circuit parameter calculation method according to the fourth embodiment of the present invention is based on the battery equivalent circuit shown in fig. 7, and fig. 7 is a third schematic structural diagram of the battery equivalent circuit according to the embodiment of the present invention. The equivalent circuit of the battery comprises an ideal voltage source and a polarization resistor R p And polarization capacitor C p The method comprises the steps of carrying out a first treatment on the surface of the Polarization resistor R p Is electrically connected to the polarized capacitor C p Polarization resistance R p Is electrically connected to the polarized capacitor C p Is a second end of (2); the positive electrode of the ideal voltage source is electrically connected to the polarization resistor R p The negative pole of the ideal voltage source is electrically connected to the charging power supply U s Or load R of (2) L Is a negative electrode of (a); polarization resistor R p Is electrically connected to the first end of the first resistor, and the second end of the first resistor is electrically connected to the charging power supply U s Positive electrode or load R of (2) L The first resistance is the ohmic internal resistance R o-NTC Or ohmic resistance R ot 。
The first resistor is ohmic resistor R ot The battery equivalent circuit also comprises a dispersion internal resistance R s-NTC Polarization resistance R p Is electrically connected to ohmic resistor R ot Ohmic resistance R ot Is electrically connected to the charging power supply U s Positive electrode or load R of (2) L Is a positive electrode of (a); internal resistance of dispersion R s-NTC Is electrically connected to the positive electrode of the ideal voltage source, disperses the internal resistance R s-NTC Is the second one of (2)The terminal is electrically connected to the negative pole of the ideal voltage source. U (U) 1 For charging power supply U s Or the load R L The voltage across it.
Ohmic resistor R when charging an ideal voltage source of the battery ot Is electrically connected to the charging power supply U s Is a positive electrode of (a); when the ideal voltage source of the battery is used for the load R L Ohmic resistance R during discharge ot Is electrically connected to the load R L Is a positive electrode of (a).
The circuit parameter calculation method provided by the fourth embodiment of the invention comprises the following steps:
s40: and acquiring a charging voltage current curve and a discharging voltage current curve.
Step S40 of the fourth embodiment of the present invention is the same as step S30 of the third embodiment of the present invention, and will not be described here again.
S41: and screening out the abrupt change points of the charging voltage rising section and the abrupt change points of the charging voltage falling section from the charging voltage current curve.
Step S41 of the fourth embodiment of the present invention is the same as step S31 of the third embodiment of the present invention, and will not be described here again.
S42: and screening out abrupt points of the discharge voltage rising section and abrupt points of the discharge voltage falling section from the discharge voltage current curve.
Step S42 of the fourth embodiment of the present invention is the same as step S32 of the third embodiment of the present invention, and will not be described here again.
S43: and calculating the difference value between the voltage of the second abrupt change point of the discharge voltage dropping section and the voltage of the first abrupt change point of the discharge voltage dropping section to obtain a third voltage difference value.
The second point of the discharge voltage drop is denoted as A d The first point of the discharge voltage drop is denoted as B d The third voltage difference is expressed as
S44: and calculating the ratio of the third voltage difference value to the charge-discharge current to obtain the resistance value of the ohmic resistor.
The resistance of the ohmic resistor is calculated by the following formula:
wherein R is ot Is the resistance value of the ohmic resistor,for the voltage of the second abrupt point of the discharge voltage drop section, +.>The voltage of the first abrupt point of the discharge voltage drop section is I, and the charge-discharge current.
S45: and calculating the difference value between the voltage of the second abrupt change point of the discharge voltage rising section and the voltage of the first abrupt change point of the discharge voltage rising section to obtain a fourth voltage difference value.
The second point of mutation of the discharge voltage rising section is denoted as E d The first point of mutation of the discharge voltage rising section is denoted as D d The fourth voltage difference is expressed as
S46: and calculating the ratio of the fourth voltage difference value to the charge-discharge current to obtain the resistance value of the polarization resistor.
The resistance of the polarization resistor is calculated by the following formula:
wherein R is P As the resistance value of the polarization resistor,for the voltage of the second abrupt point of the discharge voltage rising section, +.>The voltage of the first abrupt point of the discharge voltage rising section is I, and the charge and discharge current is I.
S47: the voltage of the ideal voltage source is calculated.
When the battery is in an open-circuit static state, the ideal voltage source of the battery can be obtained by dispersing the internal resistance R s-NTC A discharge loop is formed to realize the self discharge of the battery, and the voltage at two ends of the ideal voltage source is equal to the dispersed internal resistance R s-NTC The voltage across the two terminals, so that the ideal voltage source is shown as A in the graph of the discharge voltage current curve shown in FIG. 4 d Voltage at time.
The voltage of the ideal voltage source is calculated according to the following formula:
wherein U is O As the voltage of the ideal voltage source,is the voltage at the second abrupt point of the discharge voltage drop.
S48: and calculating the capacitance value of the polarized capacitor.
The battery will discharge the polarization capacitor C in the equivalent circuit of the battery p After the battery is charged and discharged, the polarization capacitor C in the equivalent circuit of the battery is used for p Lost charge loop which uses the stored charge to the polarization resistance R p And discharging reversely until the terminal voltage is 0, and gradually rising the battery terminal voltage to a stable state in the process. Therefore, at the battery load R L In the process of switching off to the ideal voltage source to restore stability, the ideal voltage source changes due to the polarization capacitor C p Gradually towards polarization resistance R using stored energy p The discharge is performed, and the process can be regarded as zero input response process, namely D of the graph of the discharge voltage current curve shown in FIG. 4 d -E d Stage.
The capacitance value of the polarization capacitor is calculated by the following formula:
wherein C is P T is the capacitance value of the polarized capacitor DE For the duration of the discharge voltage rising period, R P For the resistance value of the polarization resistor, ln is a logarithmic function based on natural constant, U O For the voltage of the ideal voltage source,for the voltage of the first abrupt point of the discharge voltage rising section, +.>And the voltage of the second abrupt point of the discharge voltage rising section.
As described above, in the fourth embodiment of the present invention, the difference between the voltage at the second abrupt point of the discharge voltage drop section and the voltage at the first abrupt point of the discharge voltage drop section is calculated, so as to obtain the third voltage difference. And calculating the ratio of the third voltage difference value to the charge-discharge current to obtain the resistance value of the ohmic resistor. And calculating the difference value between the voltage of the second abrupt change point of the discharge voltage rising section and the voltage of the first abrupt change point of the discharge voltage rising section to obtain a fourth voltage difference value. And calculating the ratio of the fourth voltage difference value to the charge-discharge current to obtain the resistance value of the polarization resistor. The resistance of the ohmic internal resistance and the resistance of the polarization resistor are calculated by adopting charge-discharge current, so that the problem that the parameter calculation has larger deviation due to the pre-charge of the polarization capacitor caused by the self-discharge of the storage battery and the internal resistance voltage drop caused by the self-discharge current can be effectively solved. The power equivalent circuit based on the fourth embodiment of the invention is different from the power equivalent circuits based on the second and third embodiments of the invention, and another calculation mode of the power equivalent circuit and circuit parameters is provided, so that the application range in actual scenes is widened.
Example five
The fifth embodiment of the invention provides a storage battery, which comprises the second embodiment and the third embodimentThe battery equivalent circuit in the third or fourth embodiment. Ideal voltage source U when battery equivalent circuit in storage battery 0 When the voltage of the battery is greater than or equal to the voltage threshold, the battery equivalent circuit in the storage battery can supply power to the load; ideal voltage source U when battery equivalent circuit in storage battery 0 When the voltage is smaller than the voltage threshold, the charging power supply U s Ideal voltage source U for battery equivalent circuit in accumulator 0 Charging is performed.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims (10)

1. A method for calculating circuit parameters, comprising:
acquiring a charging voltage current curve and a discharging voltage current curve;
screening out abrupt points of a charging voltage rising section and abrupt points of a charging voltage falling section from the charging voltage current curve;
screening out abrupt points of a discharge voltage rising section and abrupt points of a discharge voltage falling section from the discharge voltage current curve;
and calculating circuit parameters according to the abrupt change point of the charging voltage rising section, the abrupt change point of the charging voltage falling section, the abrupt change point of the discharging voltage rising section, the abrupt change point of the discharging voltage falling section and the charging and discharging current, wherein the circuit parameters comprise the resistance value of an ohmic resistor, the resistance value of a polarization resistor, the voltage of an ideal voltage source, the resistance value of a dispersion internal resistance and the capacitance value of a polarization capacitor.
2. The circuit parameter calculation method according to claim 1, wherein the calculating circuit parameters according to the abrupt point of the charging voltage rising section, the abrupt point of the charging voltage falling section, the abrupt point of the discharging voltage rising section, the abrupt point of the discharging voltage falling section, and the charging and discharging current includes:
acquiring battery open-circuit voltage, battery discharge electric quantity and discharge time;
Calculating the ratio of the battery discharge electric quantity to the discharge time to obtain a self-discharge current;
and calculating the ratio of the open-circuit voltage of the battery to the self-discharge current to obtain the resistance value of the dispersed internal resistance.
3. The circuit parameter calculation method according to claim 2, wherein the calculating circuit parameters according to the abrupt point of the charging voltage rising section, the abrupt point of the charging voltage falling section, the abrupt point of the discharging voltage rising section, the abrupt point of the discharging voltage falling section, and the charging and discharging current includes:
calculating a difference value between the voltage of the first abrupt change point of the charging voltage rising section and the voltage of the first abrupt change point of the discharging voltage falling section to obtain a first voltage difference value; calculating the ratio of the first voltage difference value to 2 times of the charge-discharge current to obtain the resistance value of the ohmic internal resistance;
calculating the difference value between the voltage of the first abrupt change point of the charging voltage falling section and the voltage of the first abrupt change point of the discharging voltage rising section to obtain a second voltage difference value; calculating the ratio of the second voltage difference value to 2 times of the charge-discharge current to obtain the resistance value of the polarization resistor;
the voltage of the ideal voltage source is calculated by the following formula:
U O ＝(R P +R O-NTC )·i s +U I ；
Wherein R is P Is the resistance value of the polarization resistor，R O-NTC I is the resistance value of the ohmic internal resistance s For the self-discharge current, U I Open circuit voltage for the battery;
the capacitance value of the polarization capacitor is calculated by the following formula:
wherein C is P T is the capacitance value of the polarized capacitor DE For the duration of the discharge voltage rising period, R P In order to obtain the resistance value of the polarization resistor, ln is a logarithmic function taking a natural constant as a base,for the voltage of the first abrupt point of the charging voltage drop section, +.>For the voltage of the first abrupt point of the discharge voltage rising section, +.>And the voltage of the second abrupt point of the discharge voltage rising section.
4. The circuit parameter calculation method according to claim 2, wherein the calculating circuit parameters according to the abrupt point of the charging voltage rising section, the abrupt point of the charging voltage falling section, the abrupt point of the discharging voltage rising section, the abrupt point of the discharging voltage falling section, and the charging and discharging current includes:
calculating the difference value between the voltage of the second abrupt change point of the discharge voltage dropping section and the voltage of the first abrupt change point of the discharge voltage dropping section to obtain a third voltage difference value;
calculating the ratio of the third voltage difference value to the charge-discharge current to obtain the resistance value of the ohmic resistor;
Calculating the difference value between the voltage of the first abrupt change point of the charging voltage falling section and the voltage of the first abrupt change point of the discharging voltage rising section to obtain a second voltage difference value; calculating the ratio of the second voltage difference value to 2 times of the charge-discharge current to obtain the resistance value of the polarization resistor;
calculating the voltage of the ideal voltage source according to the following formula:
U O ＝R P ·i s +U I ；
wherein R is P I is the resistance of the polarization resistor s For the self-discharge current, U I Open circuit voltage for the battery;
the capacitance value of the polarization capacitor is calculated by the following formula:
wherein C is P T is the capacitance value of the polarized capacitor DE For the duration of the discharge voltage rising period, R P In order to obtain the resistance value of the polarization resistor, ln is a logarithmic function taking a natural constant as a base,for the voltage of the first abrupt point of the charging voltage drop section, +.>For the voltage of the first abrupt point of the discharge voltage rising section, +.>And the voltage of the second abrupt point of the discharge voltage rising section.
5. The circuit parameter calculation method according to claim 1, wherein the calculating circuit parameters according to the abrupt point of the charging voltage rising section, the abrupt point of the charging voltage falling section, the abrupt point of the discharging voltage rising section, the abrupt point of the discharging voltage falling section, and the charging and discharging current includes:
Calculating the difference value between the voltage of the second abrupt change point of the discharge voltage dropping section and the voltage of the first abrupt change point of the discharge voltage dropping section to obtain a third voltage difference value;
calculating the ratio of the third voltage difference value to the charge-discharge current to obtain the resistance value of the ohmic resistor;
calculating the difference value between the voltage of the second abrupt change point of the discharge voltage rising section and the voltage of the first abrupt change point of the discharge voltage rising section to obtain a fourth voltage difference value;
calculating the ratio of the fourth voltage difference value to the charge-discharge current to obtain the resistance value of the polarization resistor;
calculating the voltage of the ideal voltage source according to the following formula:
wherein U is O For the voltage of the ideal voltage source,a voltage at a second abrupt point of the discharge voltage drop section;
the capacitance value of the polarization capacitor is calculated by the following formula:
wherein C is P T is the capacitance value of the polarized capacitor DE For the duration of the discharge voltage rising period, R P For the resistance value of the polarization resistor, ln is a logarithmic function based on natural constant, U O For the voltage of the ideal voltage source,for the voltage of the first abrupt point of the discharge voltage rising section, +. >And the voltage of the second abrupt point of the discharge voltage rising section.
6. A battery equivalent circuit, characterized in that it is applied to the circuit parameter calculation method of claim 1, said circuit comprising an ideal voltage source, a polarization resistor and a polarization capacitor; the first end of the polarization resistor is electrically connected to the first end of the polarization capacitor, and the second end of the polarization resistor is electrically connected to the second end of the polarization capacitor; the positive electrode of the ideal voltage source is electrically connected to the first end of the polarization resistor, and the negative electrode of the ideal voltage source is electrically connected to the negative electrode of the charging power supply or the negative electrode of the load; the second end of the polarization resistor is electrically connected to the first end of a first resistor, the second end of the first resistor is electrically connected to the positive electrode of the charging power supply or the positive electrode of the load, and the first resistor is an ohmic internal resistance or an ohmic resistance.
7. The battery equivalent circuit of claim 6, further comprising a dispersed internal resistance, wherein the second terminal of the polarization resistor is electrically connected to the first terminal of the ohmic internal resistance, wherein the second terminal of the ohmic internal resistance is electrically connected to the first terminal of the dispersed internal resistance, and wherein the second terminal of the dispersed internal resistance is electrically connected to the negative electrode of the ideal voltage source.
8. The battery equivalent circuit of claim 6, further comprising a dispersed internal resistance, wherein the second end of the polarization resistor is electrically connected to the first end of the ohmic resistor, and wherein the second end of the ohmic resistor is electrically connected to the positive electrode of the charging power source or the positive electrode of the load; the first end of the ohmic resistor is electrically connected to the first end of the dispersed internal resistance, and the second end of the dispersed internal resistance is electrically connected to the negative electrode of the ideal voltage source.
9. The battery equivalent circuit of claim 6, further comprising a dispersed internal resistance, wherein the second end of the polarization resistor is electrically connected to the first end of the ohmic resistor, and wherein the second end of the ohmic resistor is electrically connected to the positive electrode of the charging power source or the positive electrode of the load; the first end of the dispersed internal resistance is electrically connected to the positive electrode of the ideal voltage source, and the second end of the dispersed internal resistance is electrically connected to the negative electrode of the ideal voltage source.
10. A battery comprising the battery equivalent circuit of any one of claims 6-9.
CN202311134313.1A 2023-09-05 2023-09-05 Circuit parameter calculation method, battery equivalent circuit and storage battery Pending CN117169752A (en)

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