CN112782598B

CN112782598B - Metering method, metering device, metering equipment and metering storage medium for electric quantity information

Info

Publication number: CN112782598B
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: 2024-02-27
Anticipated expiration: 2039-11-08
Also published as: CN112782598A

Abstract

The invention discloses a metering method, a metering device, metering equipment and a storage medium for electric quantity information. The method comprises the following steps: determining an operating state of the battery device; and under the condition that the working state is a discharging state, determining the electric quantity information of the battery equipment in the current state based on a first internal resistance, 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. By using the method, the electric quantity information of the battery equipment can be accurately determined.

Description

Metering method, metering device, metering equipment and metering storage medium for electric quantity information

Technical Field

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

Background

With the development of technology, battery devices have been widely used. The battery equipment can be well protected by accurately knowing the electric quantity of the battery equipment, and the service life of the battery equipment is prolonged, wherein the battery equipment can comprise at least one battery.

The current methods for measuring the electric quantity information of the battery equipment mainly comprise a voltage method and a coulomb method. The traditional voltage method is to roughly consider the voltage of the battery equipment as the open-circuit voltage, and judge the electric quantity of the battery equipment by using a table look-up method, however, under the condition of low temperature and high current discharge, the difference between the voltage of the battery equipment and the open-circuit voltage is larger, so that a larger error can be generated when the voltage method is adopted to determine the electric quantity information of the battery equipment under the condition of low temperature and high current discharge. When the traditional coulomb method determines the electric quantity of the battery equipment, the impedance is greatly increased along with the increase of the charge and discharge times, so that the capacity of the usable battery equipment is greatly reduced, and the accuracy of the electric quantity meter is seriously affected. Therefore, how to improve the accurate measurement of the electric quantity information of the battery equipment is a technical problem to be solved.

Disclosure of Invention

The embodiment of the invention provides a metering method, a metering device, metering equipment and a storage medium for electric quantity information, so as to accurately determine 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 an operating state of the battery device;

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

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

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

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

Determining the information of the residual dischargeable electric quantity in the current state of the battery equipment according to the percentage of the residual electric quantity when the discharge is cut off, the percentage of the residual electric quantity in the current state and the total electric quantity at the current temperature;

and determining the residual dischargeable electric quantity percentage of the battery equipment in the current state according to the residual electric quantity percentage when the discharge is cut off and the residual electric quantity percentage in the current state.

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

and under the condition that the battery equipment is not electrified for the first time, the percentage of the residual electric quantity in the current state is the ratio of the percentage of the residual electric quantity in the previous state minus the electric quantity flowing through the battery equipment in the preset time and the total capacity of the battery at the current temperature.

Optionally, the determining the percentage of the remaining power when the discharge is cut off according to the first internal resistance 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;

the first relation is the relation between the discharge cut-off open-circuit voltage and the discharge cut-off residual capacity percentage; the second relation is a relation between a discharge cut-off open-circuit voltage value and a target voltage value, wherein the target voltage value is an absolute value of the discharge cut-off voltage value plus the first internal resistance multiplied by a discharge current value in the current state; the third relation is a relation between the second internal resistance and the percentages of the first internal resistance and the discharge cut-off residual electric quantity respectively, and the second internal resistance is the internal resistance measured by the battery characteristic test of the battery equipment before application in the discharge cut-off state.

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 k is equal to the second internal resistance, k is determined according to the ratio of a third resistor to a fourth resistor, the third resistor is calculated based on the relation between the internal resistance and the percentage of the residual electric quantity, the fourth resistor is obtained by dividing the current value by the open-circuit voltage value in the current state after subtracting the battery voltage value, and the open-circuit voltage value in the current state is determined according to the relation between the open-circuit voltage and the percentage of the residual electric quantity.

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

determining 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 comprises:

when the number of the batteries included in the battery equipment is at least two and the battery equipment is in an balanced state, determining the residual capacity percentage of the battery currently subjected to balancing according to the residual capacity percentage of the previous state, the current value of the battery equipment and the balanced current value;

And under the condition that the number of the batteries included in the battery equipment is at least two and the balance of the battery equipment is completed, determining the minimum remaining capacity percentage in the battery equipment as the remaining capacity percentage of the battery currently subjected to the balance.

Optionally, the method further comprises:

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 number of batteries included in the battery equipment is at least two; in the case 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 treatment 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; selecting a first battery with the largest voltage value and a second battery with the smallest voltage value from the battery equipment continuously 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 value; wherein the value of the balance current in the discharging process is determined by the remaining capacity percentage of each single 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 metering device for electric quantity information, including:

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

the power information determining module is used for determining power information of the battery equipment in the current state based on first internal resistance when 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 hybrid 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 the one or more programs are executed by the processor, the processor is caused to implement a method as provided by an embodiment of the invention;

the current acquisition module is respectively connected with the battery equipment and the processor and is used for acquiring the 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 is used for acquiring voltage signals of the battery equipment under the control of the processor, sending voltage values corresponding to the voltage signals to the processor, acquiring the temperature of the battery equipment under the control of the processor, and sending the temperature to the processor.

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

the balanced current module is used for realizing the discharge of the charge of the corresponding battery under the control of the processor so as to finish the discharge treatment of the corresponding battery.

Optionally, the apparatus further comprises: and the control end of the switching tube in the balanced 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, which when executed by a processor implements the method provided by the embodiment of the present invention.

The embodiment of the invention provides a metering method, a metering device, metering equipment and a storage medium for electric quantity information. By means 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 accurately determined according to the first internal resistance determined by the calculated open-circuit voltage.

Drawings

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

fig. 1a is a schematic diagram of a relationship between open circuit voltage and remaining capacity percentage according to a first embodiment of the present invention;

FIG. 1b is a schematic view of a coulombmeter according to a first embodiment of the present invention;

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

fig. 1d is a schematic flow chart of an equalization method according to a first embodiment of the present invention;

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

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

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

fig. 2 is a schematic structural diagram of a metering device for electric 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 illustrating an equalizing current adjusting method according to the present invention;

FIG. 3b is a schematic diagram illustrating an embodiment of the present invention for adjusting the balance current;

fig. 3c is a schematic diagram of another balanced current adjustment according to an embodiment of the present invention.

Detailed Description

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

Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts operations (or steps) as a sequential process, many of the operations can be performed in parallel, concurrently, or at the same time. Furthermore, the order of the operations may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.

The term "comprising" and variants thereof as used in this invention is open ended, i.e., including, but not limited to. The term "based on" is "based at least in part on", "according to" is "based at least in part on". The term "one embodiment" means "at least one embodiment".

It should be noted that references to "first," "second," etc. concepts in this disclosure are merely for distinguishing between corresponding content and not for limiting order or interdependence.

Example 1

Fig. 1 is a flow chart of a method for measuring electric quantity information according to an embodiment of the present invention, where the method may be applicable to determining electric quantity information of a battery device, and the method may be performed by an electric quantity 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 electric quantity information of a battery device, and the device may be connected to the battery device to collect voltage, current, temperature, and the like of the battery device.

Currently, methods for measuring the electric quantity of single batteries, such as lithium batteries, mainly include a voltage method and a coulomb method. The method for equalizing the battery voltage with 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 is difficult to realize high precision; the pure coulomb method has high current integration precision, and basically needs a voltage measurement method because the calculation of the initial value needs a complete charge and discharge period. However, the total amount of power that can be discharged at low temperature and high current drops sharply, which results in a large estimation error of the State of Charge (SOC) of the battery, so that a complicated compensation algorithm is required. The state of charge of the battery may represent a percentage of the remaining charge of the battery in the current state in the present invention.

Estimating the SOC based on the open circuit voltage: fig. 1a is a schematic diagram of a relationship between an open circuit voltage and a percentage of remaining capacity according to an embodiment of the present invention, and fig. 1a shows a relationship between an open circuit voltage and a percentage of remaining capacity, wherein an abscissa represents a percentage of remaining capacity and an ordinate represents an open circuit voltage. The relationship between open circuit voltage (Open Circuits Voltage, OCV) and SOC of a lithium battery varies little with temperature and discharge current, and is negligible. The traditional voltage method is to roughly consider the battery voltage as an open-circuit voltage, and judge the SOC by using a table look-up method. The abrupt increase in the internal resistance of the battery when the temperature becomes low causes a large difference in the battery voltage and the open circuit voltage, and the difference in the battery voltage and the open circuit voltage when the discharge current increases, which causes a large error in the SOC.

Therefore, many fuel gauge chips detect temperature while monitoring battery voltage, and then predict the remaining battery power by using a two-dimensional table look-up method. 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, accurate modeling is complex, the implementation difficulty is high, and the accuracy is generally 3% -5%.

Estimating SOC based on coulometer: coulombmeters 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 diagram of a coulometer according to a first embodiment of the present invention, R is as shown in FIG. 1b _load R is the load resistance _s Sampling resistor in milliohm level, R _in Is the internal resistance of the battery.

The method comprises the steps of converting R into R through an analog-to-digital converter _s Voltage V on _s (t)Converted into digital quantity, and the output result is accumulated and divided by resistance R _s The electric quantity flowing through the battery for a period of time can be obtained, and the following formula is shown:

so that the number of the parts to be processed,

here Δq is the statistical net charge, Q _max Is the total capacity of the battery. So SOC at state of charge is:

here, Q ₀ SOC for remaining capacity before charging ₀ Is the state of charge of the battery before charging.

The SOC at discharge state is:

here, Q ₁ SOC as residual capacity before discharge ₁ Is the state of charge of the battery before discharge.

The disadvantages of this method are:

1) The fuel gauge implemented in this way has accumulated errors and requires various complex calibration and 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, more importantly, the impedance increases greatly with the increase of the number of charge and discharge, which greatly reduces the usable battery capacity and can seriously affect the accuracy of the fuel gauge.

Although this method has the above-mentioned drawbacks, it is more irreplaceable, i.e. the deterministic relationship between the battery charge and the current flowing through the sense resistor, which results in a much improved accuracy of the electricity meter using this method.

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

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. At least one battery may be included in the battery device. The battery may be a lithium battery. The operating states may include a charged state, a discharged state, and a relaxed state. In the case where the battery device includes a plurality of batteries and is in a charged state, the batteries of each stage may be equalized such that a difference in voltage value between the batteries is smaller than a voltage threshold value to prevent overcharge of the batteries, thereby reducing the life of the battery device. Therefore, during the equalization, the battery performing equalization can be in an equalized state.

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

And S120, under the condition that the working state is a discharging state, 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 a 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 collected 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 the internal resistance of the battery device in a discharge cut-off state, and is determined according to the calculated open circuit voltage, and the calculation means is not limited herein. Such as may be determined computationally based on the relationship between the open circuit voltage and the percentage of remaining charge.

The charge information may include remaining dischargeable charge information, maximum dischargeable charge information, and remaining dischargeable charge percentage. In the case of determining the charge information according to the first internal resistance, the percentage of the charge remaining at the time of discharge cutoff may be first determined based on the first internal resistance, so that the charge information of the battery device is determined based on the percentage of the charge remaining at the time of discharge cutoff. In the process of determining the residual capacity percentage when the discharge is cut off, 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 residual capacity percentage when the discharge is cut off is determined by combining the relation between the discharge cut-off open circuit voltage and the discharge cut-off residual capacity percentage and the relation between the internal resistance and the residual capacity percentage. The relationship between the discharge cut-off open circuit voltage and the discharge cut-off residual capacity percentage can be seen in fig. 1a. Fig. 1c is a schematic diagram of the relationship between the internal resistance and the percentage of the remaining power, and the schematic diagram shown in fig. 1c may be obtained by a battery characteristic test before application.

According to the metering method for the electric quantity information, which is 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 accurately determined according to the first internal resistance determined by the calculated open-circuit voltage.

On the basis of the above embodiments, modified embodiments of the above embodiments are proposed, and it is to be noted here that only the differences from the above embodiments are described in the modified embodiments for the sake of brevity of description.

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

In one embodiment, the result of multiplying the difference of 1 minus the percentage of the remaining power at the discharge cutoff by the total power at the current temperature may be determined as the maximum power information that can be discharged in the current state of the battery device, i.e., the maximum dischargeable power information in the current state.

In one embodiment, the remaining dischargeable electric quantity information may be determined as a result of multiplying the difference of the percentage of the remaining electric quantity in the current state minus the percentage of the remaining electric quantity at the discharge cutoff by the total electric quantity at the current temperature, and the remaining dischargeable electric quantity information may represent the remaining dischargeable electric quantity.

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

In one embodiment, the result of subtracting the percentage of the remaining capacity at the discharge cutoff from the percentage of the remaining capacity at the current state is determined as the percentage of the remaining dischargeable capacity at the current state of the battery device.

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

When determining the percentage of the remaining power and the percentage of the remaining dischargeable power in the current state at the time of first power-up, the percentage of the 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 the remaining power shown in fig. 1a, and the determined percentage of the remaining power is used as the percentage of the remaining power and the percentage of the remaining dischargeable power in the current state at the time of first power-up.

In the case that the battery device is not powered on for the first time, the preset time is not limited, and a person skilled in the art can determine the preset time according to actual requirements. The previous state remaining charge percentage may be a state of charge prior to the current state, such as a state of charge prior to discharge.

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

When determining the percentage of the remaining capacity at the discharge cutoff according to the first internal resistance, the percentage of the remaining capacity at the discharge cutoff can be obtained according to a second relation comprising the first internal resistance, a third relation comprising the first internal resistance and a first relation simultaneous equation. Wherein the first relationship may be determined from fig. 1 a. The third relationship may be determined from fig. 1 c.

In one embodiment, the relationship between the second internal resistance and the first internal resistance in the third relationship includes:

The relationship between the internal resistance and the remaining capacity percentage can be seen in fig. 1c. In determining 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 resistance, the open circuit voltage in the current state may be calculated, not the voltage value of the battery device. Wherein, the battery voltage value can be obtained by collecting the voltage of the battery device. The present current value may be obtained for collecting the current of the battery device. The open circuit voltage and the remaining capacity percentage may be referred to in fig. 1a, and when determining the open circuit voltage in the current state, the determination may be based on a relationship between the open circuit voltage and the remaining capacity percentage in the current state.

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

determining electric quantity information of each battery;

In the case where the number of batteries included in the battery device is at least two, the charge information of each battery is determined separately. The technical means for determining the electric quantity information of each battery may refer to the technical means adopted when the number of batteries included in the battery device is one, and will not be described herein. When the battery equipment is in a charging state or an equilibrium state, the minimum electric quantity information is selected as the electric quantity information of the battery equipment after the electric quantity information of each battery is determined. In determining the balanced state, the charge information of the battery performing the balancing may be determined based on the remaining charge percentage of the previous state, the current value of the battery device, and the balanced current value.

In one embodiment, the method further comprises:

The current value of the battery device may be acquired. The equalization current value is a predetermined value, which can be determined based on the connection state of the device. The equalization current value may be variable, and illustratively, the adjustment of the equalization current value may be achieved by way of 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 last state remaining capacity percentage, may be determined as the remaining capacity percentage of the battery being equalized.

In one embodiment, the method further comprises:

When the balance current is determined, the difference value between the residual electric quantity information of each single cell included in the battery equipment and the residual electric quantity information of the cell with the minimum voltage value in the battery equipment can be accumulated to obtain the electric quantity information to be balanced. The equalization current can be obtained by dividing the equalization time by the electric quantity information to be equalized. The equalization time may be set according to the need, 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 unit cell may be each battery included in the battery device.

Fig. 1d is a schematic flow chart of an equalization method according to an embodiment of the present invention. As shown in fig. 1d, in the balancing process, the battery with the smallest voltage value in the battery device may be selected as a reference, and the battery with the largest voltage value in the battery device is selected for discharging until the voltage difference between the voltage of the battery and the battery with the smallest voltage value is smaller than the voltage threshold.

The equalization method comprises the following steps:

s1, obtaining the maximum battery voltage and the minimum battery voltage in the battery equipment.

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

And S3, performing discharge equalization on the battery with the maximum battery voltage.

S4, judging whether the difference value between the voltage of the battery in current balance 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 equalization of the current equalization battery.

And S6, finishing the equalization of the battery equipment.

Discharge equalization may be achieved by opening the corresponding discharge switch enable. 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 balance of the corresponding battery.

The following describes an exemplary method for metering electric quantity information provided by the invention:

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

In the current process of measuring the electric quantity of a plurality of batteries, for example, the electric quantity measurement of a plurality of lithium batteries mostly adopts the lowest voltage in each single battery as the battery voltage for electric quantity measurement statistics, and only statistics of the information such as the SOC of the single battery and the residual dischargeable electric quantity. Thus, only empirical values can be adopted in the equalizing current, if the equalizing current is set too low, the equalizing is not finally achieved, and if the equalizing current is set too high, heat dissipation is difficult.

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

s210, calculating the SOC of each battery in the battery equipment.

S220, calculating the SOC of the battery equipment.

S230, balancing control.

The execution order of S220 and S230 is not limited.

Because of the individual differences of the batteries, the voltage and the internal resistance of each battery may be different, so that the residual dischargeable electric quantity of each battery may also be different. In the case of complex discharges, the measured minimum battery voltage cannot be simply equivalent to the calculated voltage input of the SOC. The invention 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 controls the equalization algorithm.

In the process of measuring the electric quantity, when the battery equipment is in a discharging state, the internal resistance of the battery in a cut-off 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 remaining capacity percentage of each single cell is calculated firstly, then the internal resistance of the battery in the current state is calculated, then the corresponding internal resistance of the battery and the remaining unreleasable capacity percentage in the discharge cut-off voltage are calculated, and finally the SOC of each single cell in the current state is calculated.

Specifically, at the time of first power-up, the power-on is performed by the OCV and the SOC in FIG. 1a _in The relationship between them can be calculated:

SOC _in ＝SOC＝f ₁ ^-1 (OCV) (5)

SOC _in it can be considered as a percentage of the remaining battery power 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 when first powered on.

When the battery device is in a discharge state at the time of non-first power-up, calculating the SOC from the formula (4) _in Is that

Equation 6 may be used to calculate the percentage of remaining power in the current state in the case of non-first power up.

Then pass through OCV and SOC in FIG. 1a _in The relationship between the two values can calculate the OCV value in the current state, namely:

OCV＝f ₁ (SOC _in ) (7)

At this time, the open circuit voltage OCV and the battery voltage V _battery And sampling the voltage V across the resistor _s (t) is known, and the internal resistance R in the current state can be calculated by the formulas (8) and (9) _{in_current} ：

Wherein I is _s Can be acquired by a current acquisition module. Battery voltage V _battery 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.

At different temperatures, the internal resistance R of the battery _in (T) and SOC _in The relationship between these can be obtained by testing the battery characteristics before application. So according to the SOC in the current state _in R is calculated by the formula (10) _{in_test} ：

R _{in_test} ＝f ₂ (SOC _in ,T) (10)

Wherein R is _{in_test} The internal resistance value calculated by the relationship shown in fig. 1c may be used. FIG. 1c shows R _{in_test} And R is _{in_current} Relationship between them. Equation 10 shows the determination process of the third internal resistance.

According to R _{in_test} And R is _{in_current} Calculating their proportional relationship:

equation 11 determines the process of determining k.

Other SOCs can be estimated from this relationship _in The internal resistance value in the state, i.e., the relationship in the discharge cutoff state is:

R _{in_test_cutoff} ＝k*R _{in_current_cutoff} (12)

wherein k= (k) ₁ +k ₂ +L k _n ) And/n can be calculated according to a mean value calculating method, and can also be calculated by a polynomial or least square method. Equation 12 shows the relationship of the second internal resistance to the first internal resistance.

And the discharge cut-off 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 _cutoff Is determined by the system and is known; discharge current I in the present state _current The current is measured and known in real time by a current acquisition module; here discharge cut-off open circuit voltage OCV _cutoff And discharge cut-off internal resistance R _{in_current_cutoff} Unknown. Let SOC at discharge cut-off _in Is SOC (State of charge) _cutoff Then from (7), (10), (12) it is possible to:

OCV _cutoff ＝f ₁ (SOC _cutoff ) (14)

R _{in_test_cutoff} ＝k*R _{in_current_cutoff} ＝f ₂ (SOC _cutoff ，T) (15)

the SOC can be calculated by combining three unknown equations in the formulas (13), (14) and (15) _cutoff . Wherein T is the temperature which can be acquired by the mixed acquisition module. Wherein equation 14 may be a 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 equation (16) to calculate the maximum that can be played out in the current stateCapacity Q _{max_current} ：

Q _{max_current} ＝(1-SOC _cutoff )*Q _max (T) (16)

At the same time, the residual dischargeable electric quantity Q in the current state can be calculated _{remain_current} ：

Q _{remain_current} ＝(SOC _in -SOC _cutoff )*Q _max (T) (17)

The actual SOC in the current state should be

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

The intermediate variable data during calculation of each single cell is stored in the storage device of the device independently. When the battery is in a discharging state, the balance is not carried out, and the SOC of the whole battery pack takes the minimum value of the SOCs of all the single batteries; when the battery is in a charged state, the SOC of the whole battery pack also takes the minimum value of the SOCs of the single batteries, and the battery with the largest SOC starts to balance the batteries according to the voltage of the battery (namely the battery with the smallest voltage value).

When the battery device is in a charged state, equalization is required if the difference between the maximum cell voltage and the minimum cell voltage in the battery device is smaller than the voltage threshold Vth. The equalization is divided into active equalization and passive equalization, and the invention adopts passive equalization which is easy to realize. That is, the balancing current module connected in parallel with the cell to be balanced is turned on to discharge and balance the cell. The battery is recycled after being balanced, so that balance of other batteries is realized. And rechecking and the like until all equalization is completed.

During the process of the battery equipment being in the balanced state, based on the recorded state of each battery in the battery equipment, such as the residual electric quantity information, the battery equipment is formed by The formula (19) can calculate the electric quantity to be balanced, so that the balancing time can be estimated approximately according to the preset balancing current and the formula (20), and the size of the balancing current can be effectively selected to achieve a better balancing effect. To avoid the difficulty of too low an equilibrium current setting and eventually too high a heat dissipation of the equilibrium or equilibrium current setting. Those skilled in the art can set a proper balance current I according to actual requirements _Equalization And equalization time t _Equalization And (5) balancing the battery equipment. Wherein the value of the balance current is determined by the percentage of the residual capacity of each single 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} And can be the information of the residual capacity of the Nth battery in the battery equipment. Q (Q) _{remain_mincell} The remaining power information of the battery having the smallest voltage value in the battery device may be used. SOC (State of Charge) _{in_cellN} May be the remaining capacity percentage of the nth battery in the battery device. SOC (State of Charge) _{in_mincell} May be a percentage of the remaining capacity of the battery with the smallest voltage value in the battery device. Q (Q) _max And (T) is the total capacity at the current temperature.

Fig. 1f is a schematic diagram of current in an equilibrium state according to an embodiment of the present invention. Referring to FIG. 1f, since the cell being equalized has an I _Equalization While the coulometer counts only the charging current, so that the cell being equalized while in the equalization state will generate I if the coulometer of the cell is used _Equalization Error of/I. Wherein I is the current collected by the current collection module. The SOC of the balanced battery in the invention is calculated by a formula (21)

Due to I _Equalization Is inaccurate in value, such that SOC _{Balanced cell} Also inaccurate, the calibration will be performed by equation 22 when equalization is completed:

SOC _{balanced cell} ＝SOC _mincell (22)

Wherein Q is _{Balanced cell} Is the total capacity of the battery that is balanced. The SOC in equation 21 may be the SOC in the last state. SOC in equation 22 _mincell Is the minimum value of the SOC in each battery in the battery device.

Fig. 1g is a schematic flow chart of electric quantity metering according to an embodiment of the present invention, referring to fig. 1g, firstly, current, voltage and temperature in a battery device are sampled, and the sampling of the current, the voltage and the temperature is preferably implemented by a sigma-delta ADC with a size of 12 bits or more. Then judging whether the minimum value of the voltages in each single cell voltage is larger than the discharge cut-off voltage V _cutoff If the judgment result is negative, the SOC is updated to 0, and the discharge is stopped; if the current is judged to be positive, the current discharge state is further judged through the current I, if the absolute value of the current is smaller than the standby current I _tiny Then the inverse function soc=f through equation (7) ^-1 ₁ (OCV) calculating the SOC of each single cell in the current state, and compensating, namely, determining the SOC of the battery equipment according to the relation between the open circuit voltage value and the residual electric quantity percentage when the working state is in a loose state.

Then continuing to sample the current and the voltage; if I>I _tiny And (5) indicating that the current state is a charging state, so as to perform balance control and charge quantity calculation. In the process of metering the electric quantity, whether the full charge condition is met can be judged first, the full charge condition is not limited, and the full charge condition can be determined through the battery voltage and the charging current. If the battery voltage is greater than a certain value and the charging current is less than a certain value, the full charge condition, that is, the current battery device charging cut-off, can be considered to be met.

If the full charge condition is satisfied, the SOC of each single cell _in =1, soc=1, charge cut-off while current and voltage sampling is continued, if the full charge condition is not satisfied, rootThe SOC and the SOC of each single cell are carried out according to the following formula _in The calculation of (1) is as follows:

wherein SOC is _in0 It can be considered as the SOC in the last state. After the SOC is calculated, the SOC can be updated, then circulation is carried out again, and current and voltage are sampled; if I <-I _tiny Describing that the current state is a discharge state, the SOC and R of each single cell are performed according to the principles of the present invention _in And then re-enter the sampling cycle to sample the current voltage. The intermediate states of the batteries are marked in the calculation process, and the SOC of the battery equipment is calculated according to a formula (24):

SOC＝min(SOC _CELL1 ,SOC _CELL2 ...SOC _CELLn ) (24)

according to the electric quantity information metering method provided by the invention, the residual dischargeable electric quantity and the residual dischargeable electric quantity percentage of the current state of each single cell can be accurately estimated under different discharge currents at different temperatures, 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 cell in real time, so that the residual dischargeable electric quantity percentage SOC and the residual dischargeable electric quantity of each single cell are calculated in real time; the residual dischargeable electric quantity and the residual dischargeable electric quantity percentage of 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, the battery equipment can be better balanced, namely the state of each battery is recorded, and the balancing time can be estimated approximately according to the preset balancing current, so that the magnitude of the balancing current can be effectively selected to achieve a better balancing effect.

The invention can realize higher-precision SOC estimation at low temperature and high current discharge compared with the traditional voltage estimation and coulometer 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 control the balanced current according to the residual capacity of each battery and the electric quantity required to be balanced, so that the chip temperature is lower on the premise that the balanced effect is optimal.

Example two

Fig. 2 is a schematic structural diagram of a device for measuring electric quantity information according to a second embodiment of the present invention, where the device may be suitable for measuring electric quantity information of a battery device, and the device may be implemented by software and/or hardware and is generally integrated on the device.

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

wherein, the working state determining module 21 is used for determining the working state of the battery equipment;

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

In the present embodiment, the apparatus first determines the operation state of the battery device by the operation state determination module 21; and then, under the condition that the working state is a discharging state, determining the electric quantity information of the battery equipment in the current state based on a first internal resistance by an electric quantity information determining module 22, 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.

The embodiment provides a metering device for electric quantity information, which can more accurately determine the electric quantity information of battery equipment according to a first internal resistance determined by an open-circuit voltage obtained through calculation under the condition that a working state is a discharging state.

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

Further, under the condition that the battery equipment is electrified 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;

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

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

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

determining electric quantity information of each battery;

Further, the device further comprises: the balanced metering module is used for:

Further, the device further comprises: an equalization module for:

The metering device for the electric quantity information can execute the metering method for 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 a storage device 42; the number of processors 41 in the device may be one or more, one processor 41 being taken as an example in fig. 3; the storage device 42 is used for storing one or more programs; the one or more programs are executed by the one or more processors 41, causing the one or more processors 41 to implement the method according to any of the embodiments of the present invention.

The processor 41, the storage means 42 in the device may be connected by a bus or other means, in fig. 3 by way of example.

The storage device 42 in the apparatus is used as a computer readable storage medium, and may be used to store one or more programs, which may be software programs, computer executable programs, and modules, such as program instructions/modules (e.g., the operation state determining module 21 and the electric quantity information determining module 22 in the electric quantity information metering device) corresponding to the method provided by the embodiment of the present invention. The processor 41 executes various functional applications of the device and data processing, i.e. implements the methods of the above-described method embodiments, by running software programs, instructions and modules stored in the storage means 42.

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, at least one application program required for a function; the storage data area may store data created according to the use of the device, etc. In addition, 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 via 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 one or more programs included in the above-described apparatus are executed by the one or more processors 41, the programs perform the following operations: determining an operating state of the battery device; and under the condition that the working state is a discharging state, determining the electric quantity information of the battery equipment in the current state based on a first internal resistance, 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.

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

A storage device 42, coupled to the processor 41, for storing one or more programs; when executed by a processor, causes the processor 41 to implement the method as in the present invention; the current acquisition module 43 is respectively connected with the battery equipment and the processor 41, and is used for acquiring the current flowing through the battery equipment and sending a current value corresponding to the current to the processor 41;

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, and also be configured to acquire a temperature of the battery device under the control of the processor 41, and send the temperature to the processor 41.

Processor 41 in the present invention may include an equalization and SOC calculation module and a state 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 a resistance value of a 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 to the processor 41, and is configured to receive the voltage signal sent by the selection module, convert the voltage signal into a voltage value, send the voltage value to the processor 41, and 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 equalizing current modules 45 is the same as that of the batteries included in the battery equipment, the control end of each equalizing current module 45 is respectively connected with the processor 41, the input end of each equalizing current module 45 is connected with the anode of the corresponding battery, and the output end of each equalizing current module 45 is connected with the cathode of the corresponding battery; wherein the battery device may be composed of a battery CELL1, 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 way of a differential or single-ended connection to acquire the voltage of the battery device. For example, the voltage Vc1 minus Vc2 is used as the voltage of the battery CELL1 when the single-ended connection is performed. The value obtained by subtracting Vc3 from Vc2 is used as the voltage of the battery CELL 2. The voltage of battery CELLn can be determined by Vcn and its anode voltage value. When in differential connection, vc1 is connected with the positive end input of the hybrid acquisition module 44, vc2 is connected with the negative end input of the hybrid acquisition module 44, and at the moment, the output of the ADC module is the voltage of CELL 1. Vc2 is connected with the positive end input of the hybrid acquisition module 44, vc3 is connected with the negative end input of the hybrid acquisition module 44, and the output of the ADC is the voltage of CELL 2. The voltage of battery CELLn can be determined by connecting Vcn as the negative terminal input and its anode as the positive terminal input.

The equalizing current module 45 is configured to implement discharging of the charge of the corresponding battery under the control of the processor 41, so as to complete discharging processing of the corresponding battery.

The device further comprises a variable resistor, the control end of the switching tube in the balancing 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 acquisition 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 acquire the voltage or the temperature; the temperature and voltage conversion module is used for detecting the voltage of the selected input voltage and detecting the temperature; the equalization and SOC calculation module calculates the SOC and realizes the equalization 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 of each battery, the charge and discharge cut-off state and the selection of temperature and voltage detection; the storage module is used for storing algorithm program and state information of battery equipment, such as electric quantity information, and can use FLASH and E ² PROM, etc.; the equalizing current module 45 is used for discharging charges during equalization, and the magnitude of the equalizing current is controllable.

Wherein the current magnitude of the balancing current module 45 is optional, fig. 3a is a schematic diagram of balancing current adjustment provided by the present invention; FIG. 3b is a schematic diagram illustrating an embodiment of the present invention for adjusting the balance current; fig. 3c is a schematic diagram of another balanced current adjustment according to an embodiment of the present invention. Referring to fig. 3a, the control end of the switching tube in the equalizing current module 45 may be the control end of the equalizing current module 45, and is connected with the processor 41, and the equalizing current is adjustable by adopting a variable resistor connected in series on the switching tube, and the resistance value of the variable resistor may be implemented in a register configurable form according to the requirement of the equalizing time. Referring to fig. 3b, PWM control switching tubes are used to control the magnitude of the balancing currents. Referring to fig. 3c, the on-resistance of the switching tube is controlled with a variable voltage to achieve control of the magnitude of the balancing current.

Example IV

A fourth embodiment of the present invention provides a computer-readable storage medium having stored thereon a computer program for executing a metering method of electric quantity information when executed by a processor, the method comprising: determining an operating state of the battery device; and under the condition that the working state is a discharging state, determining the electric quantity information of the battery equipment in the current state based on a first internal resistance, 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 the alternative, the program may be used to perform the methods provided by any of the embodiments of the present invention when executed by a processor.

The computer storage media of embodiments of the invention may take the form of 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. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any 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 (Random Access Memory, RAM), a Read-Only Memory (ROM), an erasable programmable Read-Only Memory (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.

The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take many forms, including, but not limited to: electromagnetic signals, optical signals, or any suitable combination of the preceding. 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), and the like, or any suitable combination of the foregoing.

Computer program code for carrying out operations 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 ++ 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 kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).

Note that the above is only a preferred embodiment of the present invention and the technical principle applied. 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, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.

Claims

1. A method for metering electrical quantity information, comprising:

determining an operating state of the battery device;

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

the electric quantity information comprises a residual electric quantity percentage, residual dischargeable electric quantity information, maximum dischargeable electric quantity information and residual dischargeable electric quantity percentage; in the case where the number of batteries included in the battery device is one, the determining, based on the first internal resistance, the charge information of the battery device in the current state includes:

determining the percentage of the residual dischargeable electric quantity in the current state of the battery equipment according to the percentage of the residual electric quantity when the discharge is cut off and the percentage of the residual electric quantity in the current state;

the determining the percentage of the residual electric quantity when the discharge is cut off according to the first internal resistance comprises the following steps:

the first relation is a relation between the discharge cut-off open-circuit voltage and the discharge cut-off residual capacity percentage; the second relation is a relation between a discharge cut-off open-circuit voltage value and a target voltage value, wherein the target voltage value is an absolute value of the discharge cut-off voltage value plus the first internal resistance multiplied by a discharge current value in the current state; the third relation is a relation between the second internal resistance and the percentages of the first internal resistance and the discharge cut-off residual electric quantity respectively, and the second internal resistance is the internal resistance measured by the battery characteristic test of the battery equipment before application in the discharge cut-off state.

2. The method of claim 1, wherein the step of determining the position of the substrate comprises,

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

3. The method of claim 1, wherein the relationship of the second internal resistance to the first internal resistance in the third relationship includes:

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

Determining electric quantity information of each battery;

5. The method of claim 1, further comprising:

6. The method as recited in claim 1, further comprising:

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 number of batteries included in the battery equipment is at least two; in the case that the difference between the voltage value of the first battery and the voltage value of the second battery is larger than a voltage threshold, performing discharge treatment on the first battery until the difference 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; selecting a first battery with the largest voltage value and a second battery with the smallest voltage value from the battery equipment continuously 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 threshold value; wherein the value of the balance current in the discharging process is determined by the remaining capacity percentage of each single cell included in the battery device and the total capacity at the present temperature.

7. A metering device for electrical quantity information, comprising:

the power information determining module is used for determining power information of the battery equipment in the current state based on first internal resistance when 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;

the electric quantity information determining module is specifically configured to:

8. An electronic device, comprising: the device comprises a current acquisition module, a hybrid 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 the one or more programs are executed by the processor, the processor is caused to implement the method of any of claims 1-6;

9. The electronic device of claim 8, further comprising: the number of the equalization current modules is the same as that of the batteries included in the battery equipment, the control end of each equalization current module is connected with the processor, the input end of each equalization current module is connected with the anode of the corresponding battery, and the output end of each equalization current module is connected with the cathode of the corresponding battery;

10. The electronic device of claim 9, further comprising: and the control end of the switching tube in the balanced current module is connected with one end of the variable resistor, and the other end of the variable resistor is connected with the processor.

11. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the method according to any of claims 1-6.