CN112782598A

CN112782598A - Method, device and equipment for metering electric quantity information and storage medium

Info

Publication number: CN112782598A
Application number: CN201911089431.9A
Authority: CN
Inventors: 刘玉萍; 苏国彬
Original assignee: Chen Core Technology Co ltd
Current assignee: Chen Core Technology Co ltd
Priority date: 2019-11-08
Filing date: 2019-11-08
Publication date: 2021-05-11
Anticipated expiration: 2039-11-08
Also published as: CN112782598B

Abstract

The invention discloses a method, a device, equipment and a storage medium for metering electric quantity information. The method comprises the following steps: determining the working state of the battery equipment; and under the condition that the working state is a discharging state, determining the electric quantity information of the battery equipment under the current state based on a first internal resistance, wherein the first internal resistance is the internal resistance of the battery equipment under the discharging cut-off state, and the first internal resistance is determined according to the calculated open-circuit voltage. By the method, the electric quantity information of the battery equipment can be accurately determined.

Description

Method, device and equipment for metering electric quantity information and storage medium

Technical Field

The embodiment of the invention relates to the technical field of batteries, in particular to a method, a device, equipment and a storage medium for metering electric quantity information.

Background

With the development of technology, battery devices are widely used. The battery equipment is protected that the electric quantity of knowing battery equipment accurately can be fine, promotes battery equipment's life, wherein can include at least a section battery in the battery equipment.

At present, methods for measuring electric quantity information of battery equipment mainly include a voltage method and a coulometer method. The traditional voltage method is to roughly regard the voltage of the battery equipment as the open-circuit voltage, judge the electric quantity of the battery equipment by using a table look-up method, however, under the condition of low-temperature and large-current discharge, the difference between the voltage of the battery equipment and the open-circuit voltage is large, so that a large error is generated when the voltage method is adopted to determine the electric quantity information of the battery equipment under the condition of low-temperature and large-current discharge. When the traditional coulometer method is used for determining the electric quantity of the battery equipment, the impedance is greatly increased along with the increase of the charging and discharging times, so that the capacity of the usable battery equipment is greatly reduced, and the precision of the fuel gauge is seriously influenced. Therefore, how to improve the accurate measurement of the electric quantity information of the battery equipment is an urgent technical problem to be solved.

Disclosure of Invention

The embodiment of the invention provides a method, a device, equipment and a storage medium for metering electric quantity information, which are used for accurately determining the electric quantity information of battery equipment.

In a first aspect, an embodiment of the present invention provides a method for metering electric quantity information, including:

determining the working state of the battery equipment;

and under the condition that the working state is a discharging state, determining the electric quantity information of the battery equipment under the current state based on a first internal resistance, wherein the first internal resistance is the internal resistance of the battery equipment under the discharging cut-off state, and the first internal resistance is determined according to the calculated open-circuit voltage.

Optionally, the power information includes a remaining power percentage, remaining dischargeable power information, maximum dischargeable power information, and remaining dischargeable power percentage; when the number of the batteries included in the battery device is one, the determining the electric quantity information of the battery device in the current state based on the first internal resistance includes:

determining the percentage of the residual electric quantity when the discharge is cut off according to the first internal resistance;

determining the maximum dischargeable electric quantity information of the battery equipment in the current state according to the percentage of the residual electric quantity at the end of discharge and the total electric quantity at the current temperature;

determining the remaining dischargeable electric quantity information of the battery equipment in the current state according to the remaining electric quantity percentage at the end of discharge, the remaining electric quantity percentage in the current state and the total electric quantity at the current temperature;

and determining the percentage of the remaining dischargeable electric quantity in the current state of the battery equipment according to the percentage of the remaining electric quantity at the end of the discharge and the percentage of the remaining electric quantity in the current state.

Optionally, when the battery device is powered on for the first time, the percentage of remaining power and the percentage of remaining dischargeable power in the current state are determined by a relationship between an open-circuit voltage and the percentage of remaining power;

and under the condition that the battery equipment is not powered on for the first time, the residual capacity percentage in the current state is the ratio of the residual capacity percentage in the last state minus the capacity flowing through the battery equipment in the preset time to the total capacity of the battery at the current temperature.

Optionally, the determining, according to the first internal resistance, the percentage of the remaining capacity at the time of the discharge cutoff includes:

determining the percentage of the residual electric quantity when the discharge is cut off according to the first relation, the second relation and the third relation;

wherein the first relation is the relation between the discharge cut-off open-circuit voltage and the discharge cut-off remaining capacity percentage; the second relation is a relation between a discharge cut-off open-circuit voltage value and a target voltage value, and the target voltage value is an absolute value obtained by adding the first internal resistance to a discharge current value in the current state; the third relationship is a relationship between a second internal resistance and the first internal resistance and the percentage of the discharge cutoff residual capacity, and the second internal resistance is the internal resistance measured by the battery equipment before application in a discharge cutoff state through a battery characteristic test.

Optionally, the relationship between the second internal resistance and the first internal resistance in the third relationship includes:

the product of the first internal resistance and the k is equal to the second internal resistance, wherein the k is determined according to the ratio of a third resistance and a fourth resistance, the third resistance is calculated based on the relation between the internal resistance and the percentage of the remaining capacity, the fourth resistance is the current value divided by the value of the battery voltage subtracted from the value of the open-circuit voltage in the current state, and the value of the open-circuit voltage in the current state is determined according to the relation between the open-circuit voltage and the percentage of the remaining capacity.

Optionally, when the number of the batteries included in the battery device is at least two, the determining, based on the first internal resistance, the electric quantity information of the battery device in the current state includes:

determining the electric quantity information of each battery;

and selecting the minimum value in the electric quantity information as the electric quantity information of the battery equipment.

Optionally, the method further includes:

determining the percentage of the remaining power of the battery currently subjected to balancing according to the percentage of the remaining power in the previous state, the current value of the battery equipment and the balancing current value under the condition that the number of the batteries included in the battery equipment is at least two and the battery equipment is in the balancing state;

and determining the minimum residual capacity percentage in the battery equipment as the residual capacity percentage of the battery currently performing equalization under the condition that the number of the batteries included in the battery equipment is at least two and the equalization of the battery equipment is completed.

Optionally, the method further includes:

under the condition that the number of the batteries included in the battery equipment is at least two, selecting a first battery with the largest voltage value and a second battery with the smallest voltage value from the battery equipment; under the condition that the difference value between the voltage value of the first battery and the voltage value of the second battery is larger than a voltage threshold value, performing discharge processing on the first battery until the difference value between the voltage value of the first battery and the voltage value of the second battery is smaller than or equal to the voltage threshold value; continuing to select a first battery with the largest voltage value and a second battery with the smallest voltage value from the battery equipment until the difference value between the voltage value of the selected first battery and the voltage value of the second battery is smaller than or equal to the voltage value threshold; wherein the value of the equalizing current in the discharging process is determined by the percentage of the remaining capacity of each unit cell included in the battery device and the total capacity at the present temperature.

In a second aspect, an embodiment of the present invention further provides a device for measuring power information, including:

the working state determining module is used for determining the working state of the battery equipment;

and the electric quantity information determining module is used for determining the electric quantity information of the battery equipment in the current state based on a first internal resistance under the condition that the working state is a discharging state, wherein the first internal resistance is the internal resistance of the battery equipment in a discharging cut-off state, and the first internal resistance is determined according to the calculated open-circuit voltage.

In a third aspect, an embodiment of the present invention further provides an apparatus, including:

the device comprises a current acquisition module, a mixed acquisition module, a storage device and a processor;

the storage device is connected with the processor and used for storing one or more programs; when executed by the processor, the one or more programs cause the processor to implement the methods provided by embodiments of the invention;

the current acquisition module is respectively connected with the battery equipment and the processor and is used for acquiring current flowing through the battery equipment and sending a current value corresponding to the current to the processor;

the hybrid acquisition module is respectively connected with the battery equipment and the processor and used for acquiring the voltage signal of the battery equipment under the control of the processor and sending the voltage value corresponding to the voltage signal to the processor and also used for acquiring the temperature of the battery equipment under the control of the processor and sending the temperature to the processor.

Optionally, the apparatus further includes: the number of the equalizing current modules is the same as that of the batteries included in the battery equipment, the control end of each equalizing current module is connected with the processor, the input end of each equalizing current module is connected with the anode of the corresponding battery, and the output end of each equalizing current module is connected with the cathode of the corresponding battery;

the equalizing current module is used for realizing the discharge of the charges of the corresponding batteries under the control of the processor so as to complete the discharge processing of the corresponding batteries.

Optionally, the apparatus further comprises: and the control end of a switching tube in the equalizing current module is connected with one end of the variable resistor, and the other end of the variable resistor is connected with the processor.

In a fourth aspect, the embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the method provided by the embodiment of the present invention.

The embodiment of the invention provides a method, a device, equipment and a storage medium for metering electric quantity information. By the aid of the technical scheme, under the condition that the working state is the discharging state, the electric quantity information of the battery equipment can be more accurately determined according to the first internal resistance determined by the calculated open-circuit voltage.

Drawings

Fig. 1 is a schematic flow chart of a method for measuring electric quantity information according to an embodiment of the present invention;

fig. 1a is a schematic diagram illustrating a relationship between an open-circuit voltage and a percentage of remaining power according to an embodiment of the present invention;

fig. 1b is a schematic structural diagram of a coulometer provided by the first embodiment of the present invention;

FIG. 1c is a diagram illustrating the relationship between the internal resistance and the percentage of remaining charge;

fig. 1d is a schematic flowchart of an equalizing method according to an embodiment of the present invention;

fig. 1e is a schematic flow chart of information on electric quantity metering and balancing of the battery device according to the first embodiment of the present invention;

FIG. 1f is a schematic diagram of the current under equilibrium according to the embodiment of the present invention;

fig. 1g is a schematic flow chart of an electric quantity metering according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a device for measuring electrical quantity information according to a second embodiment of the present invention;

fig. 3 is a schematic structural diagram of an apparatus according to a third embodiment of the present invention;

FIG. 3a is a schematic diagram of an equalizing current regulation according to the present invention;

FIG. 3b is a schematic diagram illustrating another embodiment of equalizing current regulation;

fig. 3c is a schematic diagram of another equalizing current adjustment provided in the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

Before discussing exemplary embodiments in more detail, it should be noted that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart may describe the operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently or simultaneously. In addition, the order of the operations may be re-arranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figure. The processes may correspond to methods, functions, procedures, subroutines, and the like. In addition, the embodiments and features of the embodiments in the present invention may be combined with each other without conflict.

The term "include" and variations thereof as used herein are inclusive in an open-ended manner, i.e., "including but not limited to. The term "based on" is "based at least in part on" and "based on" is "based at least in part on". The term "one embodiment" means "at least one embodiment".

It should be noted that the terms "first", "second", etc. mentioned in the disclosure are only used for distinguishing the corresponding contents, and are not used for limiting the order or interdependence relationship.

Example one

Fig. 1 is a schematic flow chart of a method for measuring power information according to an embodiment of the present invention, where the method is applicable to a situation of determining power information of a battery device, and the method may be executed by a power information measuring apparatus, where the apparatus may be implemented by software and/or hardware and is generally integrated on a device, and in this embodiment, the device is a device for measuring power information of the battery device, and the device may be connected to the battery device to collect voltage, current, temperature, and the like of the battery device.

At present, the electric quantity metering method of a single battery, such as a lithium battery, mainly comprises a voltage method and a coulometer method. The method for equating the battery voltage to the open-circuit voltage has low precision, and the method for directly using the open-circuit voltage cannot realize online real-time measurement, so that a plurality of complex algorithms based on a battery model are derived, but the method still has difficulty in realizing high precision; the pure coulometer method has high current integration precision, and basically needs a method of combining voltage measurement because the initial value calculation needs a complete charge-discharge period. However, the total amount of electricity that can be discharged at low temperature and large current drops sharply, which causes a large estimation error of the State of Charge (SOC) of the battery, and thus requires a complex compensation algorithm. The state of charge of the battery may represent the percentage of the remaining battery capacity at the current state in the present invention.

Estimating SOC based on open circuit voltage: fig. 1a is a schematic diagram of a relationship between an open-circuit voltage and a percentage of remaining power according to a first embodiment of the present invention, where fig. 1a shows the relationship between the open-circuit voltage and the percentage of remaining power, an abscissa indicates the percentage of remaining power, and an ordinate indicates the open-circuit voltage. The relationship between Open Circuit Voltage (OCV) and SOC of a lithium battery varies little with temperature and discharge current, and is negligible. The conventional voltage method is to roughly regard the battery voltage as an open-circuit voltage, and use a table look-up method to determine the SOC. The rapid increase in the internal resistance of the battery as the temperature becomes lower causes a large difference between the battery voltage and the open circuit voltage, and a large difference between the battery voltage and the open circuit voltage as the discharge current increases, which cause a large error in the SOC.

Therefore, many fuel gauge chips monitor the battery voltage and detect the temperature, and then predict the battery remaining capacity by using a two-dimensional table look-up method, which still has a large estimation error of the SOC. There are also some fuel gauge chips that accurately determine the relationship between the remaining capacity of the battery and the battery voltage by modeling the battery, thereby achieving accurate fuel gauge detection. However, the accurate modeling is complex, the realization difficulty is high, and the accuracy is generally 3% -5%.

Estimating SOC based on coulomb meter: coulometers estimate the remaining capacity of a battery by measuring the net charge flowing into and out of the battery according to the principle of conservation of charge. FIG. 1b is a schematic view of a coulometer according to an embodiment of the present invention, as shown in FIG. 1b, R_loadIs a load resistance, R_sA sampling resistance in the milliohm range, R_inIs the internal resistance of the battery.

The method is to convert R into analog signal by an analog-to-digital converter_sVoltage V on_s(t) converting into digital values, accumulating the output results, and dividing by a resistor R_sThe amount of electricity flowing through the battery over a period of time can be obtained as follows:

therefore, the first and second electrodes are formed on the substrate,

here, Δ Q is the statistical net charge, Q_maxIs the total capacity of the battery. So the state of charge SOC is:

here, Q₀To the remaining capacity before charging, SOC₀Is the state of charge of the battery before charging.

The SOC in the discharged state is:

here, Q₁For remaining capacity before discharge, SOC₁Is the state of charge of the battery before discharge.

The disadvantages of this method are:

1) the electricity meter realized by the method has accumulated errors and needs various complicated calibration compensation methods.

2) Since the total battery capacity is related to the discharge current, self-discharge, the number of charge and discharge, the temperature, etc. of the battery, and more importantly, the impedance is greatly increased with the increase of the number of charge and discharge, which greatly reduces the capacity of the usable battery and seriously affects the accuracy of the fuel gauge.

Although this method has the above-mentioned disadvantages, its advantages are rather irreplaceable, i.e. the deterministic relationship between the battery level and the current flowing through the sense resistor, which leads to a much improved accuracy of the fuel gauge using this method.

As shown in fig. 1, a method for metering electrical quantity information according to a first embodiment of the present invention includes the following steps:

and S110, determining the working state of the battery equipment.

In this embodiment, the power information of the battery device may be determined in this embodiment. The battery device may include at least one battery therein. The battery may be a lithium battery. The operating state may include a charged state, a discharged state, and a relaxed state. When the battery equipment comprises a plurality of batteries and is in a charging state, the batteries at all levels can be balanced, so that the difference of voltage values among the batteries is smaller than a voltage threshold value, the batteries are prevented from being overcharged, and the service life of the battery equipment is shortened. Therefore, during the equalization process, the cells undergoing equalization can be in an equalized state.

The determination means for determining the operating state of the battery device is not limited herein, as the operating state of the battery device may be determined from the current value of the battery device. For example, in the case that the current value of the battery device is greater than the standby current value, the operating state of the battery device is determined to be the charging state; determining that the working state of the battery equipment is a discharging state under the condition that the current value of the battery equipment is smaller than a negative standby current value; determining that the operating state of the battery device is a relaxed state in a case where an absolute value of a current value of the battery device is smaller than a standby current value.

And S120, determining the electric quantity information of the battery equipment in the current state based on the first internal resistance under the condition that the working state is the discharging state.

In the invention, under the condition that the working state is the discharging state, the electric quantity information of the battery equipment is determined based on the first internal resistance, the first internal resistance is determined according to the calculated open-circuit voltage, and the acquired voltage of the battery equipment is not directly determined as the open-circuit voltage. The accuracy of determining the electric quantity information of the battery equipment is improved.

The first internal resistance is an internal resistance of the battery device in a discharge cutoff state, the first internal resistance is determined based on the calculated open circuit voltage, and the calculation means is not limited herein. Such as may be computationally determined from the relationship between open circuit voltage and percentage of remaining charge.

The electricity amount information may include remaining dischargeable electricity amount information, maximum dischargeable electricity amount information, and remaining dischargeable electricity amount percentage. In the case where the capacity information is determined from the first internal resistance, the capacity percentage remaining at the time of discharge cutoff may be first determined based on the first internal resistance, thereby determining the capacity information of the battery device based on the capacity percentage remaining at the time of discharge cutoff. In the process of determining the percentage of the remaining capacity at the end of discharge, the first internal resistance can be estimated by calculating the internal resistance of the battery in the current state in real time, and then the percentage of the remaining capacity at the end of discharge is determined by combining the relation between the discharge cut-off open-circuit voltage and the percentage of the discharge cut-off remaining capacity and the relation between the internal resistance and the percentage of the remaining capacity. The relationship between the discharge cut-off open-circuit voltage and the discharge cut-off remaining capacity percentage can be seen in fig. 1 a. Fig. 1c is a schematic diagram of a relationship between internal resistance and percentage of remaining power, and the schematic diagram shown in fig. 1c can be obtained by a battery characteristic test before application.

According to the method for metering the electric quantity information, provided by the embodiment of the invention, under the condition that the working state is the discharging state, the electric quantity information of the battery equipment can be more accurately determined according to the first internal resistance determined by the calculated open-circuit voltage.

On the basis of the above-described embodiment, a modified embodiment of the above-described embodiment is proposed, and it is to be noted herein that, in order to make the description brief, only the differences from the above-described embodiment are described in the modified embodiment.

In one embodiment, the charge information includes a remaining charge percentage, remaining dischargeable charge information, maximum dischargeable charge information, and remaining dischargeable charge percentage; when the number of the batteries included in the battery device is one, the determining the electric quantity information of the battery device in the current state based on the first internal resistance includes:

In one embodiment, the maximum amount of electricity that can be discharged in the current state of the battery device, that is, the maximum dischargeable amount of electricity in the current state, may be determined as a result of multiplying the difference value obtained by subtracting the percentage of the remaining electricity at the discharge cutoff by 1 by the total amount of electricity at the current temperature.

In one embodiment, the remaining dischargeable power information may be determined as a result of multiplying a difference between the percentage of remaining power in the current state minus the percentage of remaining power at the time of discharge and the total power at the current temperature, and may indicate the remaining amount of power that can be discharged.

In one embodiment, the ratio of the remaining dischargeable power information to the maximum dischargeable power information may be determined as a remaining dischargeable power percentage in the current state of the battery device.

In one embodiment, the result of the difference between the percentage of remaining capacity in the current state minus the percentage of remaining capacity at the time of discharge cutoff being compared with the difference between 1 minus the percentage of remaining capacity at the time of discharge cutoff may be determined as the percentage of remaining dischargeable capacity in the current state of the battery device.

In one embodiment, in a case where the battery device is first powered on, the remaining capacity percentage and the remaining dischargeable capacity percentage in the current state are determined by a relationship between an open-circuit voltage and the remaining capacity percentage;

When the percentage of remaining power and the percentage of remaining dischargeable power in the current state are determined during first power-up, the percentage of remaining power corresponding to the open-circuit voltage of the battery device may be determined based on the relationship between the open-circuit voltage and the percentage of remaining power shown in fig. 1a, and the determined percentage of remaining power is used as the percentage of remaining power and the percentage of remaining dischargeable power in the current state during first power-up.

In the case that the battery device is not powered on for the first time, the preset time may not be limited, and may be determined by a person skilled in the art according to actual needs. The last state remaining capacity percentage may be a state of charge before the current state, such as a state of charge before discharge.

In one embodiment, the determining the percentage of the remaining capacity at the time of the discharge cutoff according to the first internal resistance includes:

When the percentage of the remaining capacity at the time of the discharge cutoff is determined according to the first internal resistance, the percentage of the remaining capacity at the time of the discharge cutoff may be obtained according to a second relationship including the first internal resistance, a third relationship including the first internal resistance, and a first relational simultaneous equation. Therein, the first relationship may be determined by fig. 1 a. The third relationship can be determined from fig. 1 c.

In one embodiment, the relationship of the second internal resistance to the first internal resistance in the third relationship comprises:

The relationship between internal resistance and percentage of remaining charge can be seen in fig. 1 c. In the determining of the third resistance, the third resistance may be determined based on a relationship between the internal resistance and the remaining capacity percentage in the current state.

In the process of calculating the fourth resistor, the open-circuit voltage in the current state may be obtained by calculation, and is not the voltage value of the battery device. Wherein, the battery voltage value can be obtained by collecting the voltage of the battery equipment. The present current value may be obtained for collecting the current of the battery device. The open circuit voltage and the percentage of remaining capacity may be determined based on a relationship between the open circuit voltage and the percentage of remaining capacity in the current state when determining the open circuit voltage in the current state, referring to fig. 1 a.

In one embodiment, in a case that the number of batteries included in the battery device is at least two, the determining, based on the first internal resistance, the electric quantity information of the battery device in the current state includes:

determining the electric quantity information of each battery;

The method includes determining power information of each battery when the number of batteries included in the battery device is at least two. The technical means for determining the power information of each battery may refer to the technical means adopted when the number of the batteries included in the battery device is one, and is not described herein again. When the battery equipment is in a charging state or an equilibrium state, the minimum electric quantity information can be selected as the electric quantity information of the battery equipment after the electric quantity information of each battery is determined. The power information of the battery for equalization in the equalization state may be determined based on the remaining power percentage in the previous state, the current value of the battery device, and the equalization current value.

In one embodiment, the method further comprises:

The current value of the battery device can be acquired. The equalization current value is a predetermined value and can be determined based on the connection state of the device. The equalizing current value may be a variable quantity, and for example, the equalizing current value may be adjusted by a variable resistor, a pulse voltage, and a variable voltage.

In one embodiment, the ratio of the difference between the current value of the battery device and the equalization current value to the total capacity of the battery device, plus the percentage of the remaining capacity in the last state, may be determined as the percentage of the remaining capacity of the battery performing equalization.

In one embodiment, the method further comprises:

When the balancing current is determined, the difference value between the residual electric quantity information of each single battery included in the battery equipment and the residual electric quantity information of the battery with the minimum voltage value in the battery equipment can be accumulated to obtain the electric quantity information to be balanced. And dividing the electric quantity information to be equalized by the equalization time to obtain the equalization current. The equalization time may be set according to the requirement, and is not limited herein. Wherein the remaining capacity information may be determined based on the remaining capacity percentage and the total capacity at the current temperature. Wherein each battery cell may be each battery cell included in the battery device.

Fig. 1d is a schematic flowchart of an equalizing method according to an embodiment of the present invention. As shown in fig. 1d, in the balancing process, the battery with the minimum voltage value in the battery device may be selected as a reference, and the battery with the maximum voltage value in the battery device may be selected for discharge processing until the voltage difference between the voltage of the battery and the battery with the minimum voltage value is smaller than the voltage threshold.

The equalization method comprises the following steps:

and S1, acquiring the maximum battery voltage and the minimum battery voltage in the battery equipment.

S2, judging whether the difference value of the maximum battery voltage and the minimum battery voltage is smaller than a voltage threshold value, if so, executing S6; if not, S3 is executed.

And S3, discharging and balancing the battery with the maximum battery voltage.

S4, judging whether the difference value between the voltage of the current balanced battery and the minimum battery voltage is smaller than a voltage threshold value, if so, executing S5; if not, S3 is executed.

And S5, finishing the current balancing of the balancing battery.

And S6, finishing the balancing of the battery equipment.

Discharge equalization may be enabled by opening the corresponding discharge switch. For example, the control end of the switching tube for controlling the equalizing current module can be a discharge switch. The embodiment enables the control terminal to realize the discharge equalization of the corresponding battery.

The following describes an exemplary method for measuring power information according to the present invention:

the electric quantity information metering method provided by the invention can be applied to the electric quantity metering and balancing of lithium batteries of mobile terminal equipment, electric bicycles, electric automobiles and the like which are powered by various battery equipment. In the case that the battery device includes one battery, the present invention may be regarded as a method for measuring the power information of a single battery. In the case that the battery device includes at least two batteries, the present invention may be regarded as a method for measuring the electric quantity of a plurality of batteries, and further, the plurality of batteries are equalized. The battery in the present invention may be a lithium battery.

At present, in the process of measuring the electric quantity of a plurality of batteries, for example, most of electric quantity measurement of a plurality of lithium batteries adopts the lowest voltage in each single battery as the battery voltage of electric quantity measurement statistics, and only the information of the SOC, the residual dischargeable electric quantity and the like of the single battery is counted. Thus, only empirical values can be used for the equalization current, equalization cannot be achieved finally if the equalization current is set too low, and heat dissipation is difficult if the equalization current is set too high.

Fig. 1e is a schematic flow chart of the information on the measured electric quantity and the balancing of the battery device according to the first embodiment of the present invention, and as shown in fig. 1e, in the process of calculating the SOC of the battery device, the SOC of each battery in the battery device may be calculated first, and then the SOC of the battery device may be calculated based on the SOC of each battery. Further, the balancing of the batteries may be performed based on the SOC of each battery. The method specifically comprises the following steps:

and S210, calculating the SOC of each battery in the battery equipment.

And S220, calculating the SOC of the battery equipment.

And S230, balance control.

The execution order of S220 and S230 is not limited.

Due to the difference of individual batteries, the voltage internal resistance of each battery may be different, so the remaining dischargeable electric quantity of each battery may also be different. The measured minimum battery voltage cannot be simply equated to the voltage input amount of the SOC calculation under the complicated discharge condition. Therefore, the invention firstly calculates the percentage (SOC) of the residual dischargeable electric quantity of each lithium battery in the battery equipment, then estimates the SOC of the whole battery pack according to the SOC of each battery, and carries out the control of the equalization algorithm.

In the process of metering the electric quantity, when the battery equipment is in a discharging state, the internal resistance of the battery in the discharging state is estimated by calculating the internal resistance of the battery in the current state in real time, so that the total electric quantity which can be discharged in the current state is estimated more accurately. Specifically, the percentage of the remaining capacity of each single battery cell is calculated, then the internal resistance of the battery in the current state is calculated, then the corresponding internal resistance of the battery and the percentage of the remaining capacity which can not be discharged when the discharge cutoff voltage is calculated, and finally the SOC of each single battery cell in the current state is calculated.

The specific process is that, at the first power-on, the OCV and SOC in FIG. 1a are passed_inThe relationship between can be calculated as:

SOC_in＝SOC＝f₁ ^-1(OCV) (5)

SOC_init can be considered as the percentage of the remaining capacity of the battery in the current state. Equation 5 may be used to determine the percentage of remaining power in the current state and the percentage of remaining dischargeable power in the current state at the time of first power-up.

When the battery device is in a discharged state, the SOC is calculated from the formula (4) when the power is not first turned on_inIs composed of

Equation 6 may be used to calculate the remaining capacity percentage in the current state without first powering up.

Then through OCV and SOC in FIG. 1a_inThe OCV value in the current state can be calculated, that is:

OCV＝f₁(SOC_in) (7)

at this time, open circuit voltage OCV and battery voltage V_batteryAnd the voltage V across the sampling resistor_s(t) all known, the internal resistance R in the current state can be calculated by the formulas (8) and (9)_{in_current}：

Wherein, I_sThe current can be acquired by a current acquisition module. Voltage V of the battery_batteryThe data can be acquired by a mixed acquisition module. The fourth resistance can be determined by equation 9. The open circuit voltage value in the current state can be calculated by equation 7. The open circuit voltage value is calculated to determine the fourth resistance.

Internal resistance R of the battery at different temperatures_in(T) and SOC_inThe relation curve can be obtained by testing the battery characteristics before applicationAnd (6) discharging. So according to the SOC at the current state_inR is calculated by the formula (10)_{in_test}：

R_{in_test}＝f₂(SOC_in,T) (10)

Wherein R is_{in_test}May be the internal resistance value calculated from the relationship shown in fig. 1 c. FIG. 1c shows R_{in_test}And R_{in_current}The relationship between them. Equation 10 shows the determination process of the third internal resistance.

According to R_{in_test}And R_{in_current}The proportional relationship between the values of (A) and (B):

equation 11 determines the process of determining k.

Other SOC can be estimated based on this relationship_inThe internal resistance value in the state, namely the relation in the discharge cut-off state, is as follows:

R_{in_test_cutoff}＝k*R_{in_current_cutoff} (12)

wherein k is (k)₁+k₂+L k_n) The/n can be calculated by a mean value calculation method, and can also be calculated by a polynomial or a least square method. Equation 12 shows the relationship of the second internal resistance to the first internal resistance.

And the discharge cutoff open-circuit voltage in the current state is:

OCV_cutoff＝V_cutoff+R_{in_current_cutoff}*|I_current| (13)

wherein the discharge cut-off voltage V_cutoffDetermined by the system, is known; discharge current I in the present state_currentThe current acquisition module measures and knows in real time; here discharge cutoff open circuit voltage OCV_cutoffAnd discharge cutoff internal resistance R_{in_current_cutoff}Is unknown. Assuming SOC at discharge cutoff_inIs SOC_cutoffThen, from (7), (10), (12) we can get:

OCV_cutoff＝f₁(SOC_cutoff) (14)

R_{in_test_cutoff}＝k*R_{in_current_cutoff}＝f₂(SOC_cutoff，T) (15)

three equations of three unknown quantities in the formulas (13), (14) and (15) are combined to calculate the SOC_cutoff. Wherein T is temperature which can be acquired by a mixed acquisition module. Wherein equation 14 may be the first relationship. Equation 13 may be a second relationship. Equation 15 may be a third relationship. Wherein the first internal resistance may be R_{in_current_cutoff}. The second internal resistance may be R_{in_test_cutoff}。

Then according to the known maximum capacity Q at the current temperature_max(T) and the formula (16) can calculate the maximum dischargeable capacity Q in the current state_{max_current}：

Q_{max_current}＝(1-SOC_cutoff)*Q_max(T) (16)

Meanwhile, the remaining dischargeable electric quantity Q in the current state can be calculated_{remain_current}：

Q_{remain_current}＝(SOC_in-SOC_cutoff)*Q_max(T) (17)

So the actual SOC at the current state should be

The maximum dischargeable power information can be determined by equation 16. The remaining dischargeable power amount information in the current state can be determined by equation 17. The percentage of remaining dischargeable power in the current state can be determined by equation 18.

The intermediate variable data at the time of calculation of each cell is individually stored in the storage device of the equipment. When the battery is in a discharging state, balancing is not carried out, and the SOC of the whole battery pack takes the minimum value of the SOC of each single battery; when the battery is in a charging state, the SOC of the whole battery pack also takes the minimum value of the SOC of each single battery cell, and the battery with the maximum SOC starts to balance each battery cell by taking the voltage of the battery cell (namely the battery with the minimum voltage value) as a reference.

When the battery device is in a charged state, equalization is required if the voltage difference between the maximum cell voltage and the minimum cell voltage in the battery device is smaller than a voltage threshold Vth. The equalization is divided into active equalization and passive equalization, and the invention adopts passive equalization which is easy to realize. Namely, the balancing current module connected with the single battery needing to be balanced in parallel is opened, and the discharging balance of the single battery is carried out. The battery is recycled after being balanced, and balance of other batteries is realized. And repeating the check and the analogy until all the balance is finished.

In the process that the battery equipment is in the balance state, the electric quantity to be balanced can be calculated by the formula (19) based on the recorded states of the batteries in the battery equipment, such as the residual electric quantity information, so that the balance time can be roughly estimated according to the preset balance current and the formula (20), and the balance current can be effectively selected to achieve a better balance effect. To avoid the difficulty of too low of the equalization current setting eventually failing to reach an equalization or too high heat dissipation of the equalization current setting. Those skilled in the art can set the appropriate equalizing current I according to actual requirements_EqualizationAnd an equalization time t_EqualizationAnd completing the balance of the battery equipment. Wherein the value of the equalizing current is determined by the percentage of the remaining capacity of each battery cell included in the battery device and the total capacity at the current temperature.

t_Equalization＝ΔQ_Equalization/I_Equalization (20)

Wherein Q is_{remain_cellN}The remaining capacity information of the nth battery in the battery device may be obtained. Q_{remain_mincell}The remaining capacity information of the battery having the smallest voltage value in the battery device may be provided. SOC_{in_cellN}May be the remaining capacity percentage of the nth battery in the battery device. SOC_{in_mincell}May be the voltage value in the battery deviceThe minimum percentage of the remaining charge of the battery. Q_max(T) is the total capacity at the current temperature.

Fig. 1f is a schematic diagram of the current under the equilibrium state according to the embodiment of the present invention. Referring to fig. 1f, since the equalized cells have an I when equalized_EqualizationThe coulometer counts only the charging current, so that if the cell to be equalized is in the equalizing state, I is generated by the coulomb counting method of the cell_EqualizationError of/I. Wherein, I is the current collected by the current collecting module. The SOC of the equalized battery in the invention is calculated by formula (21)

Due to I_EqualizationIs inaccurate, so that the SOC is_{Equalizing cell}Is also inaccurate, the calibration will be done by equation 22 when equalization is over:

SOC_{equalizing cell}＝SOC_mincell (22)

Wherein Q is_{Equalizing cell}Is the total capacity of the battery in balance. The SOC in equation 21 may be the SOC in the last state. SOC in equation 22_mincellIs the minimum value of the SOC in each battery in the battery equipment.

Fig. 1g is a schematic flow chart of the electric quantity metering according to the embodiment of the present invention, and referring to fig. 1g, first, the current, the voltage, and the temperature in the battery device are sampled, and the sampling of the current, the voltage, and the temperature is preferably implemented by using a sigma-delta ADC with a bit of more than 12. Then, it is judged whether or not the minimum value of the voltages in the single cells is larger than the discharge cut-off voltage V_cutoffIf the judgment result is negative, the SOC is updated to be 0, and the discharging is cut off; if the judgment is yes, the current discharge state is further judged through the current I, and if the absolute value of the current is smaller than the standby current I_tinyThen, the inverse function SOC of equation (7) is f^-1 ₁(OCV) the SOC of each cell in the current state is calculated and compensated, that is, when the operation state is in a relaxed state, the SOC is compensated for by an open circuitThe relationship between the voltage value and the percentage of remaining charge determines the SOC of the battery device.

Then continuing to sample the current and the voltage; if I>I_tinyAnd the current state is the charging state, so that the balance control and the charging electric quantity calculation are carried out. Whether the full charge condition is met or not can be judged firstly in the process of metering the electric quantity, the full charge condition is not limited and can be determined by the voltage of the battery and the charging current. If the battery voltage is greater than a certain value and the charging current is less than a certain value, it can be considered that the full charge condition is satisfied, that is, the charging of the battery device is cut off.

SOC of each battery cell if a full charge condition is satisfied_inWhen the SOC is 1, the charging is cut off, and the current and voltage sampling is continued, and if the full charge condition is not satisfied, the SOC and SOC of each unit cell are calculated according to the following equations_inThe calculation of (a) is:

therein, SOC_in0Can be considered as SOC in the last state. After the SOC is calculated, the SOC can be updated, and then circulation is performed again to sample current and voltage; if I<-I_tinyWhen the current state is a discharge state, the SOC and R of each unit cell are performed according to the principle of the present invention_inAnd then re-entering the sampling cycle to sample the current and voltage. The intermediate state of each battery is marked in the calculation process, and the SOC of the battery device is calculated according to the formula (24):

SOC＝min(SOC_CELL1,SOC_CELL2...SOC_CELLn) (24)

the electric quantity information metering method provided by the invention can accurately estimate the residual dischargeable electric quantity and the residual dischargeable electric quantity percentage of each single battery in the current state under different temperatures and different discharge currents, namely, the cut-off discharge internal resistance, namely the first internal resistance, can be estimated in real time by calculating the current state of each single battery in real time, so that the residual dischargeable electric quantity percentage SOC and the residual dischargeable electric quantity of each single battery are calculated in real time; the remaining dischargeable electric quantity and the percentage of the remaining dischargeable electric quantity in the current state of the battery equipment can be accurately estimated under different charging and discharging states at different temperatures and different discharging currents; after the residual electric quantity is accurately estimated, better balance control can be performed on the battery equipment, namely, the states of all batteries are recorded, and the balance time can be estimated approximately according to the preset balance current, so that the balance current can be effectively selected to achieve a better balance effect.

Compared with the traditional voltage estimation and coulometer, the SOC estimation method can realize the SOC estimation with higher precision during low-temperature and large-current discharge under the condition of the same voltage and current detection. Under the condition that the battery equipment comprises a plurality of batteries, the invention can count the electric quantity to be balanced according to the residual capacity of each battery to control the balance current, so that the temperature of the chip is lower on the premise of achieving the optimal balance effect.

Example two

Fig. 2 is a schematic structural diagram of an apparatus for measuring power information according to a second embodiment of the present invention, which can be applied to measure power information of a battery device, wherein the apparatus can be implemented by software and/or hardware and is generally integrated on a device.

As shown in fig. 2, the apparatus includes: the working state determining module 21 and the electric quantity information determining module 22;

the working state determining module 21 is configured to determine a working state of the battery device;

and the electric quantity information determining module 22 is configured to determine, when the working state is a discharging state, electric quantity information of the battery device in a current state based on a first internal resistance, where the first internal resistance is the internal resistance of the battery device in a discharging cutoff state, and the first internal resistance is determined according to the calculated open-circuit voltage.

In the present embodiment, the apparatus first determines the operating state of the battery device by the operating state determining module 21; then, when the working state is a discharging state, the electric quantity information determining module 22 determines the electric quantity information of the battery device in the current state based on a first internal resistance, where the first internal resistance is the internal resistance of the battery device in a discharging cutoff state, and the first internal resistance is determined according to the calculated open-circuit voltage.

The present embodiment provides a power information metering device capable of more accurately determining power information of a battery device based on a first internal resistance determined by an open circuit voltage obtained by calculation when an operating state is a discharge state.

Further, the power information includes a remaining power percentage, remaining dischargeable power information, maximum dischargeable power information, and remaining dischargeable power percentage; in a case that the number of the batteries included in the battery device is one, the electric quantity information determining module 22 is specifically configured to:

Further, in a case where the battery device is powered on for the first time, the percentage of remaining capacity and the percentage of remaining dischargeable capacity in the current state are determined by a relationship between an open-circuit voltage and the percentage of remaining capacity;

Further, the electric quantity information determining module 22 is further specifically configured to:

Further, the relationship between the second internal resistance and the first internal resistance in the third relationship includes:

Further, in the case that the number of the batteries included in the battery device is at least two, the electric quantity information determining module 22 is specifically configured to:

determining the electric quantity information of each battery;

Further, the apparatus further comprises: a balance metering module for:

Further, the apparatus further comprises: an equalization module to:

The metering device of the electric quantity information can execute the metering method of the electric quantity information provided by any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the execution method.

EXAMPLE III

Fig. 3 is a schematic structural diagram of an apparatus according to a third embodiment of the present invention. As shown in fig. 3, the apparatus provided in the third embodiment of the present invention includes: one or more processors 41 and storage 42; the processor 41 in the device may be one or more, and one processor 41 is taken as an example in fig. 3; storage 42 is used to store one or more programs; the one or more programs are executed by the one or more processors 41 such that the one or more processors 41 implement a method according to any one of the embodiments of the present invention.

The processor 41 and the storage device 42 in the apparatus may be connected by a bus or other means, and fig. 3 illustrates the connection by a bus as an example.

The storage device 42 in the apparatus is used as a computer-readable storage medium for storing one or more programs, which may be software programs, computer-executable programs, and modules, such as program instructions/modules corresponding to the method provided by the embodiment of the present invention (for example, the operating state determining module 21 and the power information determining module 22 in the metering device of power information). The processor 41 executes various functional applications of the device and data processing by executing software programs, instructions and modules stored in the storage device 42, namely, implements the method in the above-described method embodiment.

The storage device 42 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to use of the device, and the like. Further, the storage 42 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some examples, storage 42 may further include memory located remotely from processor 41, which may be connected to the device over a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

And, when the one or more programs included in the above-mentioned apparatus are executed by the one or more processors 41, the programs perform the following operations: determining the working state of the battery equipment; and under the condition that the working state is a discharging state, determining the electric quantity information of the battery equipment under the current state based on a first internal resistance, wherein the first internal resistance is the internal resistance of the battery equipment under the discharging cut-off state, and the first internal resistance is determined according to the calculated open-circuit voltage.

The apparatus further comprises: a current collection module 43 and a hybrid collection module 44.

A storage device 42 connected to the processor 41 for storing one or more programs; when the one or more programs are executed by the processor, the processor 41 is caused to carry out the method according to the invention; the current acquisition module 43 is respectively connected with the battery device and the processor 41, and is configured to acquire a current flowing through the battery device and send a current value corresponding to the current to the processor 41;

and the hybrid acquisition module 44 is respectively connected with the battery device and the processor 41, and is configured to acquire a voltage signal of the battery device under the control of the processor 41, send a voltage value corresponding to the voltage signal to the processor 41, acquire the temperature of the battery device under the control of the processor 41, and send the temperature to the processor 41.

The processor 41 in the present invention may include an equalization and SOC calculation module and a status and control module. The hybrid acquisition module 44 includes a temperature and voltage conversion (i.e., ADC) module and a selection module. The selection module is respectively connected with the battery equipment and the temperature and voltage conversion module, and is used for acquiring a voltage signal of the battery equipment under the control of the processor 41 and sending the voltage signal to the conversion module, and is also used for acquiring a temperature parameter (which can be represented by the resistance value of the thermistor) of the battery equipment under the control of the processor 41 and sending the temperature parameter to the temperature and voltage conversion module;

the temperature and voltage conversion module is connected with the processor 41, and is configured to receive the voltage signal sent by the selection module, convert the voltage signal into a voltage value, and send the voltage value to the processor 41, and is further configured to receive the temperature parameter sent by the selection module, and send the converted temperature to the processor 41.

The apparatus further comprises: the number of the equalization current modules 45 is the same as that of the batteries included in the battery equipment, the control end of each equalization current module 45 is connected with the processor 41, the input end of each equalization current module 45 is connected with the anode of the corresponding battery, and the output end of each equalization current module 45 is connected with the cathode of the corresponding battery; the battery equipment can be composed of a battery CELL1 and a battery CELL2 … … and a battery CELLn. The TS pin of the selection module may measure the temperature of the battery device. The hybrid acquisition module 44 of fig. 3 may be connected to the battery device by a differential or single-ended connection to acquire the voltage of the battery device. For example, the single-end connection takes the value of the voltage Vc1 minus Vc2 as the voltage of the battery CELL 1. The value of Vc2 minus Vc3 is taken as the voltage of CELL 2. The voltage of the cell CELLn can be determined by Vcn and its anode voltage value. When the differential connection is performed, the Vc1 is connected to the positive terminal input of the hybrid acquisition module 44, the Vc2 is connected to the negative terminal input of the hybrid acquisition module 44, and the output of the ADC module is the CELL1 voltage. The output of the ADC is the CELL2 voltage when Vc2 is connected to the positive terminal input of the hybrid acquisition module 44 and Vc3 is connected to the negative terminal input of the hybrid acquisition module 44. The voltage of battery CELLn may be determined by connecting Vcn to the negative side input and its anode to the positive side input.

The equalization current module 45 is used for discharging the corresponding battery under the control of the processor 41.

The device further comprises a variable resistor, wherein the control end of the switching tube in the equalizing current module 45 is connected with one end of the variable resistor, and the other end of the variable resistor is connected with the processor.

The current collection module 43 is used for detecting the current flowing through the battery device; the selection (i.e. MUX) module is used for selecting the voltage and the temperature of each battery in the battery equipment, namely selecting to collect the voltage or collect the temperature; the temperature and voltage conversion module is used for carrying out voltage detection on the selected input voltage and detecting the temperature; the balance and SOC calculation module is used for calculating the SOC and realizing the balance of the battery equipment by processing the acquired voltage, current and temperature; the state and control module is used for controlling the balance control logic, the charge-discharge cut-off state and the temperature and voltage detection of each battery; the storage module is used for storing the algorithm program and the state information of the battery equipment, such as electric quantity information, and can use FLASH and E²PROM, etc.; the equalizing current module 45 is used for discharging charge during equalizing, and the magnitude of the equalizing current is controllable.

The current of the equalizing current module 45 is optional, and fig. 3a is a schematic diagram of equalizing current adjustment provided by the present invention; FIG. 3b is a schematic diagram illustrating another embodiment of equalizing current regulation; fig. 3c is a schematic diagram of another equalizing current adjustment provided in the embodiment of the present invention. Referring to fig. 3a, a control end of a switching tube in the equalizing current module 45 may be a control end of the equalizing current module 45, and is connected to the processor 41, and a variable resistor is connected in series to the switching tube to adjust the equalizing current, and a resistance value of the variable resistor may be implemented in a form that a register is configurable according to a requirement of the equalizing time. And 3b, the PWM is adopted to control the switching tube so as to realize the control of the magnitude of the balance current. Referring to fig. 3c, the on-resistance of the switching tube is controlled by a variable voltage to realize the control of the magnitude of the equalizing current.

Example four

A fourth embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program is used, when executed by a processor, to perform a method for metering power information, where the method includes: determining the working state of the battery equipment; and under the condition that the working state is a discharging state, determining the electric quantity information of the battery equipment under the current state based on a first internal resistance, wherein the first internal resistance is the internal resistance of the battery equipment under the discharging cut-off state, and the first internal resistance is determined according to the calculated open-circuit voltage.

Optionally, the program, when executed by a processor, may be further adapted to perform a method provided by any of the embodiments of the invention.

Computer storage media for embodiments of the invention may employ any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a Read Only Memory (ROM), an Erasable Programmable Read Only Memory (EPROM), a flash Memory, an optical fiber, a portable CD-ROM, an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. A computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.

A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take a variety of forms, including, but not limited to: an electromagnetic signal, an optical signal, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.

Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to: wireless, wire, fiber optic cable, Radio Frequency (RF), etc., or any suitable combination of the foregoing.

Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).

It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for metering electric quantity information is characterized by comprising the following steps:

determining the working state of the battery equipment;

2. The method of claim 1, the charge information comprising a remaining charge percentage, a remaining dischargeable charge information, a maximum dischargeable charge information, and a remaining dischargeable charge percentage; when the number of the batteries included in the battery device is one, the determining the electric quantity information of the battery device in the current state based on the first internal resistance includes:

3. The method of claim 2,

under the condition that the battery equipment is powered on for the first time, the percentage of the residual electric quantity and the percentage of the residual dischargeable electric quantity in the current state are determined by the relation between the open-circuit voltage and the percentage of the residual electric quantity;

4. The method of claim 2, wherein determining the percentage of remaining charge at the time of discharge cutoff based on the first internal resistance comprises:

5. The method of claim 4, wherein the relationship of the second internal resistance to the first internal resistance in the third relationship comprises:

6. The method according to claim 1, wherein in a case that the number of batteries included in the battery device is at least two, the determining the power information of the battery device in the current state based on the first internal resistance includes:

determining the electric quantity information of each battery;

7. The method of claim 1, further comprising:

8. The method of claim 1, further comprising:

9. An electric quantity information metering device, comprising:

10. An apparatus, comprising: the device comprises a current acquisition module, a mixed acquisition module, a storage device and a processor;

the storage device is connected with the processor and used for storing one or more programs; when executed by the processor, cause the processor to implement the method of any one of claims 1-8;

11. The apparatus of claim 10, further comprising: the number of the equalizing current modules is the same as that of the batteries included in the battery equipment, the control end of each equalizing current module is connected with the processor, the input end of each equalizing current module is connected with the anode of the corresponding battery, and the output end of each equalizing current module is connected with the cathode of the corresponding battery;

12. The apparatus of claim 11, further comprising: and the control end of a switching tube in the equalizing current module is connected with one end of the variable resistor, and the other end of the variable resistor is connected with the processor.

13. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1 to 8.