CN113359044B - Method, device and equipment for measuring residual capacity of battery - Google Patents
Method, device and equipment for measuring residual capacity of battery Download PDFInfo
- Publication number
- CN113359044B CN113359044B CN202010140432.8A CN202010140432A CN113359044B CN 113359044 B CN113359044 B CN 113359044B CN 202010140432 A CN202010140432 A CN 202010140432A CN 113359044 B CN113359044 B CN 113359044B
- Authority
- CN
- China
- Prior art keywords
- battery
- capacity
- moment
- electric quantity
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000004364 calculation method Methods 0.000 claims abstract description 31
- 238000007599 discharging Methods 0.000 claims abstract description 16
- 230000010354 integration Effects 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 8
- 230000006870 function Effects 0.000 description 11
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 8
- 229910052744 lithium Inorganic materials 0.000 description 8
- 230000032683 aging Effects 0.000 description 7
- 125000004122 cyclic group Chemical group 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 3
- 230000005611 electricity Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000010485 coping Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 230000009469 supplementation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/3644—Constructional arrangements
- G01R31/3648—Constructional arrangements comprising digital calculation means, e.g. for performing an algorithm
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses a method, a device and equipment for measuring the residual capacity of a battery. The method comprises the following steps: acquiring the discharge capacity of a battery between a first moment and a current moment, wherein the battery starts to discharge at the first moment; acquiring a first residual capacity of the battery at the first moment and a second residual capacity of the battery at a second moment, wherein the battery is cut off from discharging at the second moment; and calculating the difference value of the sum of the first residual electric quantity, the discharge capacity and the second residual electric quantity to obtain the residual electric quantity of the battery at the current moment. The scheme realizes accurate calculation of the residual electric quantity of the battery.
Description
Technical Field
The present application relates to the field of batteries, and in particular, to a method, an apparatus, and a device for measuring a remaining capacity of a battery.
Background
Currently, lithium batteries are widely applied to electronic equipment, the volume requirements on the lithium batteries are smaller and smaller, the energy density requirements are higher and higher, and the energy density of the lithium batteries is difficult to break through greatly. The lithium battery is required to have a set of accurate metering system to realize accurate calculation of the residual capacity of the lithium battery, and an electric quantity calculation method becomes an increasingly important field of large chip manufacturers and terminal equipment manufacturers.
At present, after a battery is used for a plurality of times, the characteristics such as the battery capacity and the like can be changed, or after the use temperature environment is changed, the electricity meter can not accurately learn, and the metering error is relatively large.
Disclosure of Invention
The application aims to provide a method, a device and equipment for measuring the residual capacity of a battery, wherein the method can achieve the purpose of accurately calculating the residual capacity of the battery.
To achieve the above object, an aspect of the present application provides a method of measuring a remaining capacity of a battery, the method comprising:
acquiring the discharge capacity of a battery between a first moment and a current moment, wherein the battery starts to discharge at the first moment;
acquiring a first residual capacity of the battery at the first moment and a second residual capacity of the battery at a second moment, wherein the battery is cut off from discharging at the second moment;
and calculating the difference value of the sum of the first residual electric quantity, the discharge capacity and the second residual electric quantity to obtain the residual electric quantity of the battery at the current moment.
To achieve the above object, an aspect of the present application provides a battery power measuring apparatus including:
the system comprises a voltage collector, a current collector, a temperature collector and a data processing module;
the output ends of the voltage collector, the current collector and the temperature collector are respectively connected with a data processing module;
the voltage collector and the current collector are connected with the battery to be tested, and the input ends of the temperature collectors are connected with the battery to be tested.
The voltage collector is used for collecting voltages at two end points of the current core in real time and transmitting the voltage values to the data processing module;
the current collector is used for collecting charge and discharge current data in real time and transmitting the charge and discharge current data to the data processing module;
the temperature collector samples the battery surface temperature data in real time and transmits the battery surface temperature data to the data processing module;
the data processing module is configured to obtain a battery characteristic model curve, the voltage value, the charge-discharge current data, and the temperature data, and execute the method for measuring a remaining battery capacity according to the above aspect to obtain a remaining battery capacity of the battery to be measured.
To achieve the above object, the present application provides an apparatus including the above battery level measuring device.
According to the scheme, the discharge capacity between the starting discharge time and the current time can be calculated in real time, and the residual capacity at the current time can be calculated according to the discharge capacity and the residual capacity at the starting discharge and the stopping discharge, wherein the discharge capacity is calculated in real time according to the current time, and the accurate calculation of the residual capacity at the current time of the battery can be realized. The chemical capacity can be updated in real time, so that the purpose of accurately tracking and calculating the residual electric quantity can be achieved.
Drawings
Fig. 1 is a flowchart illustrating a first embodiment of a method for measuring a remaining capacity of a battery according to the present application;
FIG. 2 is a flow chart of an embodiment of step S11 in FIG. 1;
FIG. 3 is a flowchart illustrating the step S12 of FIG. 1;
FIG. 4 is a flowchart of the step S121 in FIG. 1;
FIG. 5 is a flowchart illustrating an embodiment of step S122 in FIG. 1;
FIG. 6 is a flow chart illustrating an embodiment of step S1222 in FIG. 1;
fig. 7 is a flowchart illustrating a second embodiment of the method for measuring the remaining capacity of a battery according to the present application;
FIG. 8 is a schematic view showing the structure of an embodiment of the apparatus for measuring battery capacity according to the present application;
FIG. 9 is a schematic diagram showing the structure of an embodiment of a data processing module of a device for measuring battery capacity according to the present application;
fig. 10 is a schematic view showing the structure of an embodiment of a battery capacity measuring processing terminal according to the present application;
FIG. 11 is a schematic diagram of a memory device according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, interfaces, techniques, etc., in order to provide a thorough understanding of the present application.
The terms "system" and "network" are often used interchangeably herein. The term "and/or" is herein merely an association relationship describing an associated object, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the terms "first," "second," etc. herein are used to distinguish between similar or identical associated objects. Further, "a plurality" herein means two or more than two.
The method for measuring the remaining capacity of a battery according to the present application and the embodiments of the related apparatus and device thereof will be described in detail.
In the present application, it is understood that in all of the embodiments described below, the remaining capacity percentage, that is, the percentage of the remaining available capacity and the total available capacity, generally, in measuring the battery capacity, the capacity of the battery may be abbreviated as the capacity, for example, the remaining capacity of the battery may be referred to as the remaining capacity. The battery may be a lithium battery, among others.
Referring to fig. 1, fig. 1 is a flowchart of a method for measuring a remaining capacity of a battery according to a first embodiment of the application, the method may include the following steps:
step S11: acquiring the discharge capacity of the battery between the first moment and the current moment, and starting discharging the battery at the first moment;
the method comprises the steps of obtaining the discharge capacity between a first moment and a current moment of a battery, wherein the discharge capacity is marked as Qdsg, the moment when the battery starts to discharge is defined as the first moment, and the calculated discharge capacity is the electric quantity discharged in a time interval from the start of discharge to the current moment, so that the discharge capacity between the first moment and the current moment of the battery is obtained. Referring to fig. 2, the specific steps of step S11 are as follows:
step S111: acquiring a relation function of time and current;
the current collector is used for collecting the instant current value at each moment in the discharging process, the time is taken as an independent variable, the current is taken as a dependent variable, and a current-time function, namely a relation function of the current changing along with the time, can be obtained.
Step S112: and taking a relation function of time and current as an integrated function, and calculating the electric quantity difference between the first moment and the current moment by utilizing coulomb integration to obtain the discharge capacity.
The discharge capacity is the difference between the electric quantity at the first moment and the current moment, and can be calculated by a coulomb integral formula. Specifically, the coulomb integral formula is as follows:
wherein t0 is the first time, t is the current time, and I (t) is a current-time relationship function. And (3) carrying out coulomb integral calculation by taking a time interval formed by the first moment and the current moment as an integrated interval and a time-current relation function acquired in the step (S112) as an integrated function, and finally obtaining an electric quantity difference between the two moments, namely obtaining the discharge capacity through calculation.
Step S12: and acquiring a first residual electric quantity of the battery at a first moment and a second residual electric quantity of the battery at a second moment, and stopping discharging the battery at the second moment. Specifically, referring to fig. 3, the specific steps of step S12 are as follows:
step S121: acquiring the absolute chemical capacity of the battery;
the absolute chemical capacity of the battery is obtained, wherein the absolute chemical capacity is denoted as Qabs and refers to the energy released by the battery in a state of approaching no load and completely emptying. Acquiring no-load voltage corresponding to any two no-load moments, and obtaining the percentage of residual electric quantity corresponding to any two no-load moments through a no-load voltage discharging curve, wherein the no-load voltage discharging curve is a curve of voltage change along with time when a battery is in no-load, and the curve is recorded as an OCV curve; calculating the difference between the percentage of the remaining capacity corresponding to the first moment and the current moment, and calculating the ratio of the discharge capacity to the difference between the percentage of the remaining capacity to obtain the absolute chemical capacity, wherein step S121 is shown in fig. 4, and the specific steps are as follows:
step S1211: acquiring no-load voltage corresponding to any two moments, and acquiring the percentage of the residual electric quantity corresponding to any two no-load moments through a no-load voltage discharge curve;
and acquiring the no-load voltage corresponding to the current moment at the first moment in the no-load voltage discharging curve, wherein the no-load voltage discharging curve further comprises the information of the residual electric quantity percentage, and the no-load voltage percentage is recorded as the SOC. In other words, the no-load voltage corresponding to the first time and the current time is obtained, and the remaining capacity percentage corresponding to the first time and the current time can be obtained through the no-load voltage discharge curve.
Step S1212: and calculating the ratio of the discharge capacity to the residual capacity percentage difference between any two idle times to obtain absolute chemical capacity, wherein the residual capacity percentage difference is the difference of the residual capacity percentages corresponding to the any two idle times. For example, taking the first time, that is, the discharge start time and the current time, as any two times, the calculation process is: the discharge capacity calculated in step S11 corresponds to the percentage of the remaining capacity at the current time and the first time obtained in step 121, the difference between the percentage of the remaining capacity at the first time and the percentage of the remaining capacity at the current time is calculated, and the ratio between the discharge capacity and the difference between the percentage of the remaining capacity is calculated to obtain the absolute chemical capacity. Specifically, the above calculation process may be expressed by the following formula:
wherein t0 is the first time, t is the current time, deltaQ is the discharge capacity, and SOC ocv (t) is the remaining power percentage at the current time, SOC ocv And (t 0) is the percentage of the residual electric quantity corresponding to the first moment, and the absolute chemical capacity of the battery can be calculated by the formula.
In other embodiments, any two times may be any two idle times, and the two times listed in this embodiment are one of the cases, which is only for convenience in explaining the calculation process of the absolute chemical capacity.
Step S122: referring to fig. 5, the specific steps are as follows:
step S1221: and acquiring the percentage of the residual electric quantity at the first moment.
As can be known from the step S121, the no-load voltage discharge curve further includes information about the percentage of the remaining power.
Therefore, the method for obtaining the percentage of the residual electric quantity at the first moment comprises the following steps: the voltage collector acquires the no-load voltage at the first moment, and then the no-load voltage discharge curve can directly acquire the percentage of the residual electric quantity at the first moment from the no-load voltage at the first moment.
Step S1222: and obtaining a voltage drop coefficient at the second moment, and obtaining the actual discharging current of the battery at the second moment and the lower limit voltage of the system.
In this embodiment, the actual discharge current and the system lower limit voltage of the battery at the second time of the battery are obtained. The actual discharging current of the battery at the second moment of the battery can be acquired by a current collector, and the lower limit voltage of the system can be acquired by a voltage collector. And obtaining a voltage drop coefficient at a second moment, wherein the voltage drop coefficient is a slope of the voltage drop of the output voltage according to the load current under the load state, and the voltage drop coefficient is influenced by the temperature of the battery and the percentage of the residual capacity. For example, the battery is discharged from time t0, and the pressure drop coefficient at time t1 is calculated. As shown in fig. 6, the specific calculation steps are as follows:
s1222a: and acquiring the no-load voltage and the load voltage at the second moment and the actual discharge current.
According to the coulomb integral formula:
further, the discharge capacity Δq of the discharge intervals t0 to t1 is obtained, and is further calculated by the following formula:
the absolute chemical capacities Qabs can be calculated by the method in step S121, and can be regarded as known variables here. Therefore, when the discharge capacity DeltaQ and the absolute chemical capacity Qabs are known, the voltage sampler intercepts the no-load voltage V at the start of discharge ocv After (t 0), the residual capacity percentage SOC at the start of discharge is known from the no-load voltage discharge curve ocv(t0) . The residual electric quantity percentage SOC at the time t1 can be calculated by combining the conditions and the formulas ocv(t1) . Percentage of remaining charge SOC at a known time t1 ocv(t1) In the case of (2), the no-load voltage V at time t1 is calculated based on the no-load voltage discharge curve ocv (t 1). According to the load voltage V at time t1 acquired by the voltage acquisition device 0 And (t 1), acquiring an actual discharge current I (t 1) at the time t1 by a current acquisition device.
S1222b: calculating a pressure drop coefficient at a second moment;
after the no-load voltage, the load voltage and the discharge current at the second moment are obtained in S1222a, the calculation formula of the voltage drop coefficient is further calculated:
wherein T is temperature, SOC ocv(t1) And calculating the ratio of the difference value of the no-load voltage and the load voltage at the time t1 to the discharge current to obtain the value of the voltage drop coefficient K at the time t1 as the percentage of the residual electric quantity at the time t 1. In the above embodiment, it should be noted that t1 may be any time during the discharging process, and the calculated pressure drop coefficient is the pressure drop coefficient at any time.
In this embodiment, the pressure drop coefficient at the second time needs to be calculated, and the above formula is used to make the time t1 be the second time, that is, the time of stopping the discharge, and the pressure drop coefficient at the second time can be finally obtained by sleeving the above calculation method.
In addition, in the no-load voltage discharge curve, K values corresponding to different remaining capacity percentages SOCs are different. The K value obtained by the calculation method is updated in real time in the whole discharge period, so that the value of the voltage drop coefficient is updated in time in the discharge period to adapt to the change of the voltage drop coefficient of the battery caused by aging.
S1222c: and adjusting the pressure drop coefficient at the second moment by the temperature interval value of the current temperature.
Today, the accuracy difference of the electric quantity meter on the market is relatively large when the electric quantity meter is used for coping with the temperature change of a battery, especially in an ultralow temperature environment, and the problem that the power of a system is lost due to electric quantity jump can be caused. Because the pressure drop coefficient K varies in different temperature intervals, the pressure drop coefficient changes greatly when the battery temperature is very normal, especially low, so the value of K needs to be temperature compensated, specifically, different temperature intervals are divided according to the temperature characteristics of the battery core, and the value of the coefficient K is adjusted according to the temperature interval in which the temperature value acquired by the temperature collector is located.
Specifically, a certain conversion relation exists between the K value at different temperatures and the K value at normal temperature, and the SOC is tested according to different residual electric quantity percentages at normal temperature of the sample battery through experiments ocv The K values (K1, K2, K3, K4, K5 … …) of the intervals are tested through experiments, and the K values at different temperatures and the coefficients A (A1, A2, A3, A4, A5 … …) at normal temperature are tested, B (B1, B2, B3, B4, B5 … …) are tested, the coefficients are temperature compensation coefficients, the amplitude of temperature compensation at normal temperature is reflected, and it is understood that the temperature compensation coefficients of different temperature intervals are different, and meanwhile, the temperature compensation coefficients are also influenced by the K values. Further, the temperature compensation interval is selected according to the characteristics of the battery cells and the use scene, for example, a battery with a low temperature of-40 ℃ is used in some scenes, and the modeling needs to reach-40 ℃. And typically only to-20 degrees.
In the use process, the normalized normal temperature K value is updated in real time, and the K values at different temperatures are calculated through the compensation coefficients A, B and C … … at various temperatures, and the following table is referred to:
| normal temperature | K1 | K2 | K3 | K4 | K5 | …… |
| Low temperature 1 | A1K1 | A2K2 | A3K3 | A4K4 | A5K5 | …… |
| Low temperature 2 | B1K1 | B2K2 | B3K3 | B4K4 | B5K5 | …… |
| …… | …… | …… | …… | …… | …… | …… |
| High temperature 1 | C1K1 | C2K2 | C3K3 | C4K4 | C5K5 | …… |
| …… | …… | …… | …… | …… | …… | …… |
At the low temperature 1, corresponding supplementation of A1, A2, A3, A4 and A5 is carried out aiming at different pressure drop coefficients K1, K2, K3, K4 and K5; at the low temperature 2, B1, B2, B3, B4 and B5 are correspondingly supplemented aiming at different pressure drop coefficients K1, K2, K3, K4 and K5; at high temperature 1, C2, C3, C4 and C5 are correspondingly supplemented for different pressure drop coefficients K1, K2, K3, K4 and K5. The temperature compensation of the other temperature difference pressure drop coefficients K is not described here. The temperature compensation is carried out on the K value by the mode, so that the accuracy of the K value at different temperatures is ensured, the calculation of the residual electric quantity of the battery is adapted to the change at different temperatures, and the accuracy of metering is ensured.
Step S1223: and obtaining the no-load voltage of the battery at the second moment by multiplying the voltage drop coefficient battery by the actual discharge current of the battery at the second moment and adding the lower limit voltage of the system, and obtaining the residual capacity percentage of the battery at the second moment through a no-load voltage discharge curve.
In the determination of the battery discharge cutoff, the battery discharge cutoff voltage V ocv (term) and actual discharge current I (term) and system lower limit voltage V 0 (term) is concerned.Wherein the actual discharge current I (term) is obtained by a current collector, the system lower limit voltage V 0 (term) may be acquired by the voltage collector. When the output voltage of the battery is the system lower limit voltage V 0 (term) at this time, the corresponding voltage drop coefficient is defined as Kterm, so the battery discharge cut-off voltage V ocv The specific calculation formula of (term) is as follows:
V ocv (term)＝ΔV term +V 0 (term)；
ΔV term ＝Kterm*I(term)；
at a known system lower limit voltage V 0 (term) and the actual discharge current I (term) also have the voltage drop coefficient Kterm calculated in step S1222, and the no-load voltage V at the second time can be calculated by the above formula ocv (term) and thus the remaining charge percentage SOC at the second time from the no-load voltage discharge curve ocv (term)。
In other embodiments, the temperature compensation may be performed on the pressure drop coefficient at the first time to obtain the remaining power percentage at the first time.
Step S123: and respectively obtaining products of the absolute chemical capacity, the first residual capacity percentage and the second residual capacity percentage to obtain the first residual capacity and the second residual capacity.
As can be seen from steps S121 and S122, the first remaining power is qabs_soc ocv (t 0); the second residual electric quantity is Qabs SOC ocv (term); percentage of remaining charge SOC at a known absolute chemical capacity Qabs and first time ocv (t 0) percent remaining amount SOC at the second time ocv (term) the first remaining power and the second remaining power are calculated.
Step S13: and calculating the difference value of the sum of the first residual electric quantity, the discharge capacity and the second residual electric quantity to obtain the residual electric quantity of the battery at the current moment.
Discharge capacity, first remaining capacity Qabs SOC calculated through steps S11-S12 ocv (t 0) and second remaining amount of electricity Qabs SOC ocv (term) the remaining capacity of the battery was calculated and the remaining capacity of the battery was designated as RemCap. Specifically, the calculation formulaThe following is shown:
RemCap＝Qabs*SOC ocv (t0)-Qdsg-Qabs*SOC ocv (term)；
when the battery starts to discharge from the time t0, absolute chemical capacity Qabs and discharge capacity Qdsg are obtained, and the residual electric quantity percentage SOC is obtained when the discharge is started ocv (t 0) and the remaining amount percentage SOC at the second time ocv The value of (term) is calculated by the above formula to obtain the remaining capacity RemCap of the battery.
Different from the prior art, the residual capacity of the battery is calculated by acquiring absolute chemical capacity and discharge capacity, and calculating the residual capacity percentage at the beginning of discharge and the residual capacity percentage at the end of discharge. The battery chemical energy and the pressure drop coefficient are updated in real time in the whole battery declaration period, the pressure drop coefficient is adjusted at different temperatures, the matching of the battery model and the accuracy of measurement when the characteristics change due to aging in the battery life period are ensured. The scheme realizes accurate calculation of the residual capacity of the battery under the conditions of different loads, different environmental temperatures, multiple times of cyclic aging and the like.
The present application further proposes a second embodiment of a method for measuring the remaining capacity of a battery, wherein the battery type may be a lithium battery, as shown in fig. 7, the method of the present embodiment comprises the steps of:
step S21: acquiring the discharge capacity of the battery between the first moment and the current moment, and starting discharging the battery at the first moment;
step S22: acquiring a first residual capacity of the battery at a first moment and a second residual capacity of the battery at a second moment, and stopping discharging the battery at the second moment;
step S23: calculating the difference value of the sum of the first residual electric quantity, the discharge capacity and the second residual electric quantity to obtain the residual electric quantity of the battery at the current moment;
the steps S21 to S23 are similar to the steps S11 to S13, and are not repeated here.
Step S24: calculating the total available capacity of the battery after the battery is fully charged;
the remaining capacity of the battery can be obtained from steps S11-S13, and further the remaining available capacity and the percentage of the total available capacity, i.e. RSOC, can be calculated at this time.
Firstly, calculating the available total capacity, wherein the available total capacity is recorded as FullCap, and the calculation method is specifically as follows:
FullCap＝Qabs*SOC ocv(charge) -Qabs*SOC ocv(term) ；
wherein SOC is ocv(charge) The percentage of the remaining electric quantity when the electric quantity is fully charged can be obtained by an idle voltage discharging curve after the full charge voltage is obtained. Qabs is absolute chemical Capacity, SOC ocv(term) The Qabs and the SOC can be calculated by the calculation method of the first embodiment as the percentage of the remaining power at the discharge cutoff ocv(term) And will not be described in detail herein. Finally, the available total capacity FullCap can be obtained by the formula.
Step S25: the percentage of the remaining power is derived from the percentage of the remaining power to the total capacity available.
The percentage of the remaining capacity is obtained from the percentage of the remaining capacity obtained by the calculation method of the first embodiment and the total capacity available after full charge, and the specific calculation formula is as follows:
and finally, calculating the residual electric quantity percentage RSOC, wherein the residual capacity of the battery is reflected by the percentage, so that the user experience is better.
Different from the prior art, the residual electric quantity is calculated by acquiring absolute chemical capacity and discharge capacity, and calculating the residual electric quantity percentage at the beginning of discharge and the residual electric quantity percentage at the second moment. The method has the advantages that the chemical energy and the pressure drop coefficient of the battery are updated in real time in the whole battery declaration period, the pressure drop coefficient is adjusted at different temperatures, and when the characteristics change caused by aging in the battery life period, the matching of the model and the accuracy of measurement are ensured. The scheme realizes accurate calculation of the residual electric quantity of the battery under the conditions of different loads, different environmental temperatures, multiple times of cyclic aging and the like. Further, in real applications, the percentage of the remaining power is also obtained by obtaining the percentage of the remaining power and the total available capacity. The available total capacity of the fully charged battery is calculated, and then the percentage of the residual electric quantity and the available total capacity is calculated to obtain the percentage of the residual electric quantity. The residual electric quantity percentage measurement residual electric quantity enables the display of the residual electric quantity to be transparent and visual.
Further, referring to fig. 8, fig. 8 is a schematic structural diagram of a battery power measuring device according to an embodiment of the application, wherein the battery type may be a lithium battery. As shown in fig. 8, the basic architecture of the battery electric quantity measuring device of the present embodiment is divided into a voltage collector 32, a current collector 33, a temperature collector 34, and a data processing module 35, wherein the voltage collector 32 is connected with the data processing module 35, the current collector 33 is connected with the data processing module 35, the temperature collector 34 is connected with the data processing module 35, and the voltage collector 32, the current collector 33, and the temperature collector 34 are all connected with the battery element 31 to be measured. The functions of the module devices are as follows: the voltage collector 32 collects voltages at two end points of the current core in real time and transmits the voltage values to the data processing module 35, the current collector 33 collects charge and discharge currents in real time and transmits the charge and discharge currents to the data processing module 35, the temperature collector 34 samples the surface temperature of the battery in real time and transmits the surface temperature to the data processing module 35, and the data processing module 35 is used for obtaining and calculating the residual capacity of the battery to be measured according to the battery characteristic model curve, the voltage values, the charge and discharge current data and the temperature data. Specifically, the data processing module 35 may use the obtained data and perform the method embodiment to obtain the remaining battery capacity of the battery to be tested. The voltage, current and temperature in the above method embodiments may be acquired by the voltage collector 32, the current collector 33 and the temperature collector 34, respectively.
Further, referring to fig. 9, the data processing module 35 in fig. 8 includes a battery characteristic model unit 41, a coulomb integration unit 42, a voltage drop coefficient unit 43, a temperature compensation unit 44, and an electric quantity calculation unit 45. The specific subunit processing functions are as follows:
battery characteristic model unit 41: the empty voltage discharge curve (OCV) of the battery and the residual capacity percentage (SOCocv) of the battery corresponding to the OCV curve are stored, and the curve is unchanged in the life cycle of the battery and becomes the basis for calculating other variables. The specific description of the no-load voltage discharge curve and the percentage of the remaining battery power can be referred to in the description of the above method embodiments.
The coulomb integration unit 42 calculates the battery input-output capacity by an integration algorithm based on the charge-discharge current value acquired by the current collector 34. The input/output capacity of the battery may be referred to as the discharge capacity of the battery, and the specific calculation mode may be referred to as the description about the discharge capacity in the above method embodiment.
Pressure drop coefficient unit 43: and updating different voltage drop coefficients corresponding to a plurality of open-circuit voltage points of the battery through a built-in algorithm according to the current voltage, current and temperature values of the battery.
Temperature compensation unit 44: and adjusting the pressure drop coefficient of the battery according to different temperature intervals acquired by the temperature acquisition module. The method for determining and adjusting the pressure drop coefficient by the pressure drop coefficient unit 43 and the temperature compensation unit 44 can be referred to the description of the pressure drop coefficient in the above method embodiment.
The electric quantity calculation unit 45: the electric quantity calculation unit is used for integrating data of the battery characteristic model unit, the coulomb integration unit, the voltage drop coefficient unit and the temperature compensation unit, and giving the residual electric quantity and/or the residual electric quantity percentage of the battery to be measured according to the load condition of the battery to be measured. The specific calculation manner of the remaining capacity and the percentage of the remaining capacity of the battery to be measured can be referred to the related description of the above method embodiment.
The specific processing procedures of the above units may refer to the contents of the first or second embodiment of the method for measuring the remaining capacity of a battery according to the present application, and will not be repeated here.
Different from the prior art, the residual capacity is calculated by acquiring the discharge capacity and the absolute chemical capacity, and calculating the residual capacity percentage at the beginning of discharge and the residual capacity percentage at the second moment. And the battery chemical energy and the pressure drop coefficient are updated in the whole battery declaration period, and the pressure drop coefficient is adjusted at different temperatures, so that the model is matched and the metering is accurate when the characteristics change caused by aging in the battery life period. The device for measuring the residual electric quantity of the battery realizes accurate calculation of the residual electric quantity of the battery under the conditions of different loads, different environmental temperatures, multiple times of cyclic aging and the like. Further, the battery power measuring device also obtains the percentage of the residual power from the percentage of the residual power and the total available capacity. The available total capacity of the fully charged battery is calculated, and then the percentage of the residual electric quantity and the available total capacity is calculated to obtain the percentage of the residual electric quantity. The residual electric quantity percentage measurement residual electric quantity enables the display of the residual electric quantity to be transparent and visual.
Further, as shown in fig. 10, in the present embodiment, the battery level measurement processing terminal 50 includes a memory 501 and a processor 502, wherein the memory 501 stores therein computer instructions that can be executed to implement the above-described method of measuring the remaining capacity of the battery. The processor 502 is configured to execute computer instructions stored in the memory 501 to implement the method for measuring the remaining battery capacity described above.
It is understood that the processor 502 may be the data processing module 35 of fig. 8.
As shown in fig. 11, the present application further provides a storage device 60, where the storage device 60 may specifically be a U-disc, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disc, where program instructions may be stored, or may also be a server storing the computer instructions, where the server may send the stored computer instructions 601 to another device for running, or may also self-run the stored computer instructions 601. Further, the storage device may be the memory 501 of the battery level measurement processing terminal of fig. 10 described above.
The application also provides equipment comprising the battery electric quantity measuring device, such as electronic equipment, e.g. a mobile phone, a computer or an electric vehicle, e.g. an electric vehicle, and the like.
In the several embodiments provided in the present application, it should be understood that the disclosed method and apparatus may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., a division of a device or unit, merely a division of a logic function, and there may be additional manners of dividing in actual implementation, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiment.
In addition, functional units in various embodiments of the present application may be integrated in one processing unit, or various units may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods of the various embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The foregoing is only the embodiments of the present application, and therefore, the patent scope of the application is not limited thereto, and all equivalent structures or equivalent processes using the descriptions of the present application and the accompanying drawings, or direct or indirect application in other related technical fields, are included in the scope of the application.
Claims (5)
1. A method of measuring a remaining capacity of a battery, comprising:
acquiring a relation function of time and current;
calculating the electric quantity difference between the first moment and the current moment by utilizing coulomb integration by taking the relation function of the time and the current as a product function to obtain discharge capacity, and starting discharging the battery at the first moment;
acquiring no-load voltage corresponding to any two no-load moments, and obtaining the residual capacity percentage corresponding to the any two no-load moments through a no-load voltage discharge curve;
calculating the ratio of the discharge capacity between any two idle times to the percentage difference of the residual electric quantity to obtain absolute chemical capacity, wherein the percentage difference of the residual electric quantity is the percentage difference of the residual electric quantity corresponding to any two idle times;
acquiring the voltage at the first moment, and acquiring the percentage of the residual electric quantity at the first moment through a no-load voltage discharge curve;
acquiring no-load voltage, load voltage and actual discharge current at the second moment, and acquiring actual discharge current and system lower limit voltage of a battery at the second moment; the battery is cut off to discharge at the second moment;
calculating a pressure drop coefficient at a second moment; adjusting the pressure drop coefficient at the second moment according to the temperature interval value of the current temperature;
calculating to obtain the no-load voltage of the battery at the second moment by multiplying the voltage drop coefficient at the second moment by the actual discharge current of the battery at the second moment and adding the lower limit voltage of the system, and obtaining the residual electric quantity percentage of the battery at the second moment through a no-load voltage discharge curve;
obtaining products of the absolute chemical capacity, the percentage of the residual electric quantity at the first moment and the percentage of the residual electric quantity at the second moment respectively to obtain a first residual electric quantity and a second residual electric quantity;
and calculating the difference value of the sum of the first residual electric quantity, the discharge capacity and the second residual electric quantity to obtain the residual electric quantity of the battery at the current moment.
2. The method of claim 1, wherein the calculating the difference between the first remaining power and the sum of the discharge capacity and the second remaining power to obtain the remaining power of the battery at the current time further comprises:
calculating the total available capacity of the battery after the battery is fully charged;
the remaining capacity percentage of the battery is obtained from the percentage of the remaining capacity of the battery and the total capacity available after the battery is fully charged.
3. A battery level measurement apparatus, comprising:
the system comprises a voltage collector, a current collector, a temperature collector and a data processing module;
the output ends of the voltage collector, the current collector and the temperature collector are respectively connected with a data processing module;
the input ends of the voltage collector and the current collector are connected with the battery to be tested;
the voltage collector is used for collecting voltages at two end points of the current core in real time and transmitting the voltage values to the data processing module;
the current collector is used for collecting charge and discharge current data in real time and transmitting the charge and discharge current data to the data processing module;
the temperature collector samples the battery surface temperature data in real time and transmits the battery surface temperature data to the data processing module;
the data processing module is used for obtaining a battery characteristic model curve, the voltage value, the charge-discharge current data and the temperature data, and executing the method of any one of claims 1 to 2 to obtain the battery residual capacity of the battery to be tested.
4. A battery charge measurement apparatus as claimed in claim 3, comprising:
the data processing module comprises a battery characteristic model unit, a coulomb integration unit, a voltage drop coefficient unit, a temperature compensation unit and an electric quantity calculation unit;
the output ends of the battery characteristic model unit, the coulomb integration unit, the voltage drop coefficient unit and the temperature compensation unit are connected with the input end of the electric quantity calculation unit;
the battery characteristic model unit is used for storing a no-load voltage discharge curve of the battery and the percentage of the residual electric quantity of the battery corresponding to the no-load voltage discharge curve;
the coulomb integration unit is used for calculating the input and output capacity of the battery through an integration algorithm according to the charge and discharge current data acquired by the current collector;
the voltage drop coefficient unit is used for updating different voltage drop coefficients corresponding to a plurality of open circuit voltage points of the battery through a built-in algorithm according to the current voltage, current and temperature values of the battery;
the temperature compensation unit is used for adjusting the voltage drop coefficient of the battery according to different temperature intervals acquired by the temperature acquisition unit;
the electric quantity calculation unit is used for integrating the data of the battery characteristic model unit, the coulomb integration unit, the voltage drop coefficient unit and the temperature compensation unit, and giving the residual electric quantity and/or the residual electric quantity percentage of the battery to be measured according to the load condition of the battery to be measured.
5. An apparatus, comprising:
the battery level measuring apparatus according to claim 3 or 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010140432.8A CN113359044B (en) | 2020-03-03 | 2020-03-03 | Method, device and equipment for measuring residual capacity of battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010140432.8A CN113359044B (en) | 2020-03-03 | 2020-03-03 | Method, device and equipment for measuring residual capacity of battery |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113359044A CN113359044A (en) | 2021-09-07 |
| CN113359044B true CN113359044B (en) | 2023-11-24 |
Family
ID=77523234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010140432.8A Active CN113359044B (en) | 2020-03-03 | 2020-03-03 | Method, device and equipment for measuring residual capacity of battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113359044B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113687252B (en) * | 2021-09-16 | 2023-12-29 | 广东力科新能源有限公司 | Method for measuring battery capacity |
| CN113740738B (en) * | 2021-09-29 | 2024-01-12 | 蜂巢能源科技有限公司 | Battery cell capacity prediction method and application thereof |
| CN115097311B (en) * | 2022-06-20 | 2023-10-03 | 广东高标电子科技有限公司 | Method and device for calculating residual electric quantity of battery |
| TWI821056B (en) * | 2022-11-30 | 2023-11-01 | 神基科技股份有限公司 | Electronic device and reporting method of battery capacity |
| CN116520164B (en) * | 2023-02-09 | 2024-08-06 | 深圳市汉沣微电子有限公司 | Lithium battery electricity metering management system and electricity metering management method |
| CN116754976A (en) * | 2023-05-25 | 2023-09-15 | 盐城工学院 | An intelligent battery remaining power estimation system |
| CN117420463B (en) * | 2023-12-19 | 2024-03-26 | 浙江地芯引力科技有限公司 | Method and device for updating chemical capacity of battery, electronic equipment and storage medium |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1020003A (en) * | 1996-07-01 | 1998-01-23 | Kyushu Denki Seizo Kk | Model base battery residual capacity meter |
| US6157169A (en) * | 1997-04-30 | 2000-12-05 | Samsung Electronics Co., Ltd. | Monitoring technique for accurately determining residual capacity of a battery |
| WO2001027646A1 (en) * | 1999-10-08 | 2001-04-19 | Yazaki Corporation | Battery capacity calculating method and device therefor |
| JP2004361312A (en) * | 2003-06-06 | 2004-12-24 | Panasonic Ev Energy Co Ltd | Remaining capacity arithmetic unit and remaining capacity computing method of secondary battery |
| CN104111429A (en) * | 2014-08-07 | 2014-10-22 | 中颖电子股份有限公司 | Method for metering residual electric quantity of lithium battery based on voltage tracking |
| CN106291390A (en) * | 2016-10-13 | 2017-01-04 | 宁德时代新能源科技股份有限公司 | Method and device for calculating residual electric quantity during battery charging and battery pack |
| CN108279385A (en) * | 2018-01-26 | 2018-07-13 | 深圳市道通智能航空技术有限公司 | State of charge evaluation method, device and the electronic equipment of battery |
| WO2018196121A1 (en) * | 2017-04-26 | 2018-11-01 | 华为技术有限公司 | Method and device for use in determining internal short circuit of battery |
| CN109856548A (en) * | 2018-12-19 | 2019-06-07 | 安徽江淮汽车集团股份有限公司 | Power battery capacity estimation method |
| CN109991545A (en) * | 2019-03-29 | 2019-07-09 | 深圳猛犸电动科技有限公司 | A kind of battery pack detection method of quantity of electricity, device and terminal device |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4032934B2 (en) * | 2002-11-15 | 2008-01-16 | ソニー株式会社 | Battery capacity calculation method, battery capacity calculation device, and battery capacity calculation program |
| US6892148B2 (en) * | 2002-12-29 | 2005-05-10 | Texas Instruments Incorporated | Circuit and method for measurement of battery capacity fade |
| JP4780965B2 (en) * | 2005-01-14 | 2011-09-28 | 三洋電機株式会社 | Battery remaining capacity detection method and power supply device |
| FR3003038B1 (en) * | 2013-03-06 | 2016-08-19 | Ifp Energies Now | METHOD FOR DETERMINING THE RESIDUAL CAPACITY OF A BATTERY |
-
2020
- 2020-03-03 CN CN202010140432.8A patent/CN113359044B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1020003A (en) * | 1996-07-01 | 1998-01-23 | Kyushu Denki Seizo Kk | Model base battery residual capacity meter |
| US6157169A (en) * | 1997-04-30 | 2000-12-05 | Samsung Electronics Co., Ltd. | Monitoring technique for accurately determining residual capacity of a battery |
| WO2001027646A1 (en) * | 1999-10-08 | 2001-04-19 | Yazaki Corporation | Battery capacity calculating method and device therefor |
| JP2004361312A (en) * | 2003-06-06 | 2004-12-24 | Panasonic Ev Energy Co Ltd | Remaining capacity arithmetic unit and remaining capacity computing method of secondary battery |
| CN104111429A (en) * | 2014-08-07 | 2014-10-22 | 中颖电子股份有限公司 | Method for metering residual electric quantity of lithium battery based on voltage tracking |
| CN106291390A (en) * | 2016-10-13 | 2017-01-04 | 宁德时代新能源科技股份有限公司 | Method and device for calculating residual electric quantity during battery charging and battery pack |
| WO2018196121A1 (en) * | 2017-04-26 | 2018-11-01 | 华为技术有限公司 | Method and device for use in determining internal short circuit of battery |
| CN108279385A (en) * | 2018-01-26 | 2018-07-13 | 深圳市道通智能航空技术有限公司 | State of charge evaluation method, device and the electronic equipment of battery |
| CN109856548A (en) * | 2018-12-19 | 2019-06-07 | 安徽江淮汽车集团股份有限公司 | Power battery capacity estimation method |
| CN109991545A (en) * | 2019-03-29 | 2019-07-09 | 深圳猛犸电动科技有限公司 | A kind of battery pack detection method of quantity of electricity, device and terminal device |
Non-Patent Citations (2)
| Title |
|---|
| 基于卡尔曼滤波修正算法的电池SOC估算;毛华夫;万国春;汪镭;张谦;;电源技术(第02期);全文 * |
| 电动汽车动力电池剩余电量SOC的研究;朱元培;《中国优秀硕士学位论文全文数据库》;全文 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN113359044A (en) | 2021-09-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN113359044B (en) | Method, device and equipment for measuring residual capacity of battery | |
| Lin et al. | A study on the impact of open circuit voltage tests on state of charge estimation for lithium-ion batteries | |
| CN107991623B (en) | Battery ampere-hour integral SOC estimation method considering temperature and aging degree | |
| CN108132442B (en) | storage battery joint state estimation method based on off-line data driving | |
| CN103250066B (en) | The system and method for sensing battery capacity | |
| CN105203969B (en) | State-of-charge method of estimation based on modified RC battery models | |
| CN106249171B (en) | A kind of electrokinetic cell system identification and method for estimating state for the wide sampling interval | |
| CN106646256B (en) | Battery capacity calculating method | |
| CN109991545B (en) | Battery pack electric quantity detection method and device and terminal equipment | |
| JP5474993B2 (en) | Method for determining the state of charge of a battery in the charge or discharge phase | |
| CN103797374A (en) | System and method for battery monitoring | |
| CN106250576A (en) | A kind of modeling method of lithium battery model based on motional impedance | |
| CN109655758B (en) | Battery open-circuit voltage measuring method and system | |
| CN104237792B (en) | Battery capacity prediction method | |
| CN111736083A (en) | Battery health state acquisition method and device and storage medium | |
| CN110579718A (en) | method and device for acquiring SOH (state of health) of battery and battery pack | |
| CN112698218A (en) | Battery health state acquisition method and device and storage medium | |
| CN105866700A (en) | Lithium ion battery quick screening method | |
| CN116203428A (en) | Self-discharge detection method based on constant voltage charging to calculate equivalent model parameters of lithium battery | |
| Goh et al. | Successive-approximation algorithm for estimating capacity of Li-ion batteries | |
| CN116061762A (en) | Mixed battery pack balancing method, balancing system, balancing device and vehicle | |
| CN115902653A (en) | Method and device for determining battery aging degree, storage medium and electronic equipment | |
| CN113484783B (en) | Battery SOH detection method, device, system, medium and program product | |
| CN112130080B (en) | Accurate measurement method for SOC-OCV curve of power lithium ion battery at low temperature | |
| CN117471324A (en) | Method and device for evaluating consistency of single capacity in battery module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |