Method, device, system and storage medium for detecting battery power

Abstract

This application is applicable to the technical field of lead-acid battery detection, and provides a method, device, system and storage medium for detecting battery power. The method for detecting battery power includes: obtaining the current of the battery, the voltage of the battery, and the number of charge-discharge cycles of the battery; determining the actual capacity of the battery according to the number of charge-discharge cycles; determining a first reference power of the battery according to the voltage and the actual capacity; determining a second reference power of the battery according to the current; and determining the true power of the battery according to the first reference power and the second reference power. The method for detecting battery power provided by the embodiments of this application can detect the power of lead-acid batteries with relatively high accuracy.

Description

Technical Field

[0001] This application belongs to the technical field of lead-acid battery detection, and particularly relates to a method, device, system and storage medium for detecting battery power. Background Art

[0002] At present, lead-acid batteries are widely used in fields such as transportation, communication, power, and aviation due to their advantages such as a wide operating temperature range and stable performance. During the use of lead-acid batteries, if discharge protection and charging protection are not carried out on the lead-acid batteries, the service life of the lead-acid batteries will be damaged, and even the lead-acid batteries will be scrapped. Therefore, it is particularly important to detect the power of lead-acid batteries to prevent overcharging and over-discharging of lead-acid batteries.

[0003] Currently, the main methods for detecting the power of lead-acid batteries are the voltage method (open-circuit voltage method and discharge voltage method), internal resistance method, ampere-hour integration method, and neural network method. The open-circuit voltage method is not applicable to working lead-acid batteries; since the discharge current has a great influence on the discharge voltage of lead-acid batteries, the discharge voltage method cannot cope with application scenarios with large current changes; the internal resistance method and the neural network method have high requirements for the cost of components; with the increase in the use time of lead-acid batteries, the ampere-hour integration cumulative error will gradually increase.

[0004] Therefore, how to detect the power of lead-acid batteries with high precision is a problem that currently exists. Summary of the Invention

[0005] Embodiments of this application provide a method, device, system and storage medium for detecting battery power, which can achieve high-precision detection of the power of lead-acid batteries.

[0006] In a first aspect, embodiments of this application provide a method for detecting battery power, including:

[0007] Obtain the current of the battery, the voltage of the battery, and the number of charge-discharge cycles of the battery;

[0008] Determine the actual capacity of the battery according to the number of charge-discharge cycles;

[0009] Determine a first reference power of the battery according to the voltage and the actual capacity;

[0010] Determine a second reference power of the battery according to the current;

[0011] Determine the true power of the battery according to the first reference power and the second reference power.

[0012] In a possible implementation manner of the first aspect, the obtaining the number of charge-discharge cycles of the battery includes:

[0013] Calculate the cumulative loss value of the battery power;

[0014] Based on the cumulative loss value and the nominal capacity of the battery, obtain the number of charge-discharge cycles.

[0015] In a possible implementation manner of the first aspect, the determining the first reference power of the battery according to the voltage and the actual capacity includes:

[0016] Substitute the voltage into the power consumption characteristic fitting curve to obtain the power percentage;

[0017] Based on the power percentage and the actual capacity, obtain the first reference power.

[0018] In a possible implementation manner of the first aspect, the power consumption characteristic fitting curve is formed by fitting the power consumption characteristic curve.

[0019] In a possible implementation manner of the first aspect, the obtaining the first reference power according to the power percentage and the actual capacity includes:

[0020] Substitute the power percentage and the actual capacity into the first calculation formula to obtain the first reference power;

[0021] The first calculation formula is:

[0022] y1 = hk

[0023] Wherein, y1 is the first reference power, h is the actual capacity, and k is the power percentage.

[0024] In a possible implementation manner of the first aspect, the determining the second reference power of the battery according to the current includes:

[0025] Substitute the current into the second calculation formula to obtain the second reference power;

[0026] The second calculation formula is:

[0027]

[0028] Wherein, y2 is the second reference power, i is the current, and t is the power consumption time.

[0029] In a possible implementation manner of the first aspect, the determining the true power of the battery according to the first reference power and the second reference power includes:

[0030] Filter the first reference power to obtain the filtered first reference power;

[0031] Substitute the second reference power, the true power obtained in the previous calculation period, and the filtered first reference power into the third calculation formula to obtain the true power;

[0032] The third calculation formula is:

[0033] y s = y sq -(y2 - y sq ) × y′1 ÷ y2

[0034] where y s is the true power, y sq is the true power obtained in the previous calculation period, y′1 is the filtered first reference power, and y2 is the second reference power.

[0035] In a second aspect, an embodiment of the present application provides a battery power detection device, including:

[0036] An acquisition module for acquiring the current of the battery, the voltage of the battery, and the number of charge-discharge cycles of the battery;

[0037] An actual capacity determination module for determining the actual capacity of the battery according to the number of charge-discharge cycles;

[0038] A first reference power determination module for determining the first reference power of the battery according to the voltage and the actual capacity;

[0039] A second reference power determination module for determining the second reference power of the battery according to the current;

[0040] A true power determination module for determining the true power of the battery according to the first reference power and the second reference power.

[0041] In a third aspect, an embodiment of the present application provides a battery power detection system, including a voltage sensor, a current sensor, and a controller;

[0042] The voltage sensor is used to collect the voltage of the battery and transmit the voltage to the controller;

[0043] The current sensor is used to collect the current of the battery and transmit the current to the controller;

[0044] The controller is used to execute the method described in any one of the first aspects.

[0045] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, where the computer-readable storage medium stores a computer program, and when the computer program is executed by a controller, the method described in any one of the first aspects is implemented.

[0046] The beneficial effects of the embodiments of the present application compared with the prior art are as follows:

[0047] Obtain the current of the battery, the voltage of the battery, and the number of charge-discharge cycles of the battery. Determine the actual capacity of the battery according to the number of charge-discharge cycles. Determine the first reference power of the battery according to the voltage and the actual capacity. Determine the second reference power of the battery according to the current. Determine the true power of the battery according to the first reference power and the second reference power. In the present application, the first reference power is determined by the actual capacity and the voltage of the battery, and the actual power of the battery is obtained from the number of charge-discharge cycles of the battery, which ensures the accuracy of the actual power of the battery and thus the accuracy of the first reference power. Since the voltage is unstable, the obtained first reference power is also unstable. The present application eliminates the instability of the first reference power through the second reference power, and the second reference power is determined by the current of the battery. The present application determines the true power of the battery through the first reference power and the second reference power of the battery, ensuring the accuracy and stability of the true power. Therefore, the battery power detection method provided by the embodiments of the present application can detect the lead-acid battery power with high precision.

[0048] It can be understood that the beneficial effects of the second to fourth aspects above can refer to the relevant descriptions in the first aspect above, and will not be elaborated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings in the following descriptions are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0050] Figure 1 is a schematic flowchart of a method for detecting battery power provided by an embodiment of the present application;

[0051] Figure 2 is a schematic flowchart of a method for detecting battery power provided by another embodiment of the present application;

[0052] Figure 3 is a schematic flowchart of a method for detecting battery power provided by another embodiment of the present application;

[0053] Figure 4 is a schematic flowchart of a method for detecting battery power provided by another embodiment of the present application;

[0054] Figure 5It is a schematic structural diagram of a battery power detection device provided by another embodiment of the present application;

[0055] Figure 6 It is a schematic structural diagram of a battery power detection system provided by another embodiment of the present application;

[0056] Figure 7 It is a schematic diagram of a typical charging characteristic curve of a lead-acid battery;

[0057] Figure 8 It is a schematic diagram of a typical discharging characteristic curve of a lead-acid battery.

[0058] In the figure: 40, acquisition module; 41, actual capacity determination module; 42, first reference power determination module; 43, second reference power determination module; 44, true power determination module; 50, current sensor; 51, controller; 52, voltage sensor. Detailed implementation manners

[0059] In the following description, for the purpose of illustration rather than limitation, specific details such as specific system structures and technologies are proposed to thoroughly understand the embodiments of the present application. However, those skilled in the art should clearly understand that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details from interfering with the description of the present application.

[0060] It should be understood that when used in the specification and appended claims of the present application, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0061] It should also be understood that the term "and / or" as used in the specification and appended claims of the present application refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0062] As used in the specification and appended claims of the present application, the term "if" can be interpreted as "when", "once", "in response to determining", or "in response to detecting" according to the context. Similarly, the phrase "if determined" or "if detecting [the described condition or event]" can be interpreted as meaning "once determined", "in response to determining", "once detecting [the described condition or event]", or "in response to detecting [the described condition or event]" according to the context.

[0063] In addition, in the description of the specification and the appended claims of the present application, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be construed as indicating or implying relative importance.

[0064] The reference to "one embodiment" or "some embodiments" etc. described in the specification of the present application means that in one or more embodiments of the present application, specific features, structures or characteristics described in connection with that embodiment are included. Thus, the statements "in one embodiment", "in some embodiments", "in other some embodiments", "in still other embodiments", etc. that appear in different places in this specification do not necessarily all refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways. The terms "comprising", "including", "having" and their variants all mean "including but not limited to", unless otherwise specifically emphasized in other ways.

[0065] As Figure 1 shown, an embodiment of the present application provides a method for detecting battery power, including:

[0066] S1. Obtain the current of the battery, the voltage of the battery, and the number of charge-discharge cycles of the battery.

[0067] Specifically, the current of the battery can be obtained through a current sensor connected to the battery, the voltage of the battery can be obtained through a voltage sensor connected to the battery, and the number of charge-discharge cycles of the battery can be obtained through a controller. The controller obtains the number of charge-discharge cycles of the battery according to the cumulative loss value of the battery power and the nominal capacity of the battery.

[0068] It should be noted that the battery in the embodiment of the present application can be a lead-acid battery, a lead-acid graphene battery, etc.

[0069] S2. Determine the actual capacity of the battery according to the number of charge-discharge cycles.

[0070] Specifically, there is a certain relationship between the number of charge-discharge cycles of the battery and the capacity of the battery. Therefore, according to the number of charge-discharge cycles of the battery, the actual capacity of the battery can be determined. Among them, the number of charge-discharge cycles of the battery is calculated according to the cumulative loss value of the battery power during the actual use time of the battery, which ensures the accuracy of the number of charge-discharge cycles of the battery, and further ensures the accuracy of the actual capacity of the battery.

[0071] Exemplarily, a capacity-cycle characteristic fitting curve can be pre-stored. When the number of charge-discharge cycles of the battery is obtained, the number of charge-discharge cycles is substituted into the capacity-cycle characteristic fitting curve to obtain the actual capacity of the battery. Among them, the capacity-cycle characteristic fitting curve of the battery is formed by fitting the capacity-cycle characteristic curve.

[0072] Exemplarily, a quadratic function of one variable, a cubic function of one variable, or a Fourier transform can be used to fit the capacity-cycle characteristic curve to obtain a fitted capacity-cycle characteristic curve.

[0073] It should be noted that the capacity-cycle characteristic curve can be provided by the battery manufacturer, and this curve is used to show the change of the battery capacity as the number of power consumption cycles of the battery increases. Among them, the number of power consumption cycles of the battery represents a complete charging cycle.

[0074] S3. Determine the first reference power of the battery according to the voltage and the actual capacity.

[0075] Specifically, there is a certain relationship between the number of power consumption cycles of the battery and the capacity of the battery. After obtaining the number of power consumption cycles of the battery, the actual power of the battery can be determined. The number of power consumption cycles of the battery is calculated according to the cumulative loss value of the battery power during the actual use time of the battery, which ensures the accuracy of the number of power consumption cycles of the battery, and further ensures the accuracy of the actual capacity of the battery. Therefore, based on the actual capacity of the battery determined in the above step S2 and combined with the voltage of the battery, the accuracy of the first reference power of the battery obtained is ensured. Specifically, when the battery discharges, the voltage is the discharge voltage, and when the battery charges, the voltage is the charging voltage.

[0076] S4. Determine the second reference power of the battery according to the current.

[0077] Specifically, due to the instability of the voltage, the obtained first reference power is also unstable. In this application, the second reference power of the battery is determined according to the current of the battery, and the second reference power is used to eliminate the instability of the first reference power.

[0078] Exemplarily, the second reference power of the battery can be determined by the ampere-hour integration method. The current is brought into the second calculation formula to obtain the second reference power. The second calculation formula is:

[0079]

[0080] Among them, y2 is the second reference power, i is the current. Specifically, when the battery discharges, the current is the discharge current, and when the battery charges, the current is the charging current, and t is the power consumption time.

[0081] S5. Determine the true power of the battery according to the first reference power and the second reference power.

[0082] Specifically, the first reference power in this application is determined by the actual capacity and voltage of the battery. The actual power of the battery is obtained from the number of charge-discharge cycles of the battery, which ensures the accuracy of the actual power of the battery and thus the accuracy of the first reference power. Due to unstable voltage, the obtained first reference power is also unstable. In this application, the second reference power is obtained through current and ampere-hour integration method, and the instability of the first reference power is eliminated by using the second reference power. Therefore, the true power of the battery is determined according to the first reference power and the second reference power, ensuring the accuracy and stability of the true power of the battery. Therefore, the battery power detection method provided by the embodiments of this application can detect the power of lead-acid batteries with relatively high accuracy.

[0083] As Figure 2 shown, in S1 of the embodiments of this application, it specifically includes:

[0084] S11. Calculate the cumulative loss value of the battery power.

[0085] Specifically, the cumulative loss value of the battery power is obtained by accumulating the loss values of the battery power during the actual use time of the battery.

[0086] Exemplarily, the battery is a brand-new battery with a nominal capacity of 10 Ah. The battery is discharged. At the beginning of the discharge, the battery power is 10 Ah. After a period of discharge time, the battery power becomes 5 Ah, then the loss value of the battery power is 5 Ah. After another period of discharge time, the battery power becomes 1 Ah, then the loss value of the battery power is 4 Ah. Since the battery power is too low, the battery is protected from discharge and the discharge is stopped, then the battery is charged. After the battery is fully charged, the battery power is 10 Ah. The battery is discharged again. After a period of discharge time, the battery power becomes 2 Ah, then the loss value of the battery power is 8 Ah. At this time, the battery is no longer discharged. Therefore, during the actual use time of the battery, the cumulative loss value of the battery power is 5 + 4 + 8 = 17 Ah.

[0087] S12. Obtain the number of charge-discharge cycles according to the cumulative loss value and the nominal capacity of the battery.

[0088] Specifically, divide the cumulative loss value by the nominal capacity of the battery to obtain the number of charge-discharge cycles.

[0089] Exemplarily, assuming the nominal capacity of the battery is 10 Ah, using the above cumulative loss value of the battery power of 17 Ah, the number of charge-discharge cycles is obtained as 1.7 times.

[0090] It should be noted that the nominal capacity of the battery is the battery capacity specified by national standards. It reflects the amount of power stored in the battery. The larger the value, the more power is stored.

[0091] As Figure 3 shown, in S3 of the embodiment of the present application, it specifically includes:

[0092] S31. Substitute the voltage into the electrical characteristic fitting curve to obtain the percentage of electricity.

[0093] Specifically, the electrical characteristic fitting curve is a general term for the charging characteristic fitting curve and the discharging characteristic fitting curve. If the obtained voltage is the discharging voltage, substitute the discharging voltage into the discharging characteristic fitting curve to obtain the percentage of electricity corresponding to the discharging voltage. If the obtained voltage is the charging voltage, substitute the charging voltage into the charging characteristic fitting curve to obtain the percentage of electricity corresponding to the charging voltage. The electrical characteristic fitting curve is fitted from the electrical characteristic curve. Among them, the charging characteristic fitting curve is fitted from the charging characteristic curve, and the discharging characteristic fitting curve is fitted from the discharging characteristic curve. Since the relationship between voltage and electricity is continuously collected during the charging and discharging process, there will be a large amount of data, which is not conducive to program calculation. Fit the charging characteristic curve and the discharging characteristic curve to reduce a large amount of data, simplify the calculation amount, and save the program calculation time.

[0094] Exemplarily, as Figure 7 shown, Figure 7 the curve in is a typical charging characteristic curve of a lead-acid battery. The charging characteristic curve is fitted by using a multi-segment linear fitting method. Take the starting point of the charging characteristic curve as point a, start calculating from point a, take points according to the data given on the abscissa, calculate the standard deviation of each point, and find the point with the smallest standard deviation as point b. Then, starting from point b, calculate the standard deviation of the points behind point b, and find the point with the smallest standard deviation among the points behind point b as point c. Then find points d and e in the same way. Finally, the charging characteristic curve is fitted into four straight lines, that is, from point a to point b is the first segment, from point b to point c is the second segment, from point c to point d is the third segment, and from point d to point e is the fourth segment. For other more complex charging characteristic curves of lead-acid batteries, they can be divided into more segments.

[0095] Exemplarily, as Figure 8 shown, Figure 8 the curve in is a typical discharging characteristic curve of a lead-acid battery. The discharging characteristic curve is fitted by using a multi-segment multi-function fitting method. The first segment uses linear fitting, and the second segment uses non-linear fitting. The division principle of the first segment and the second segment is to take points according to the data given on the abscissa, calculate the standard deviation of each point. At the beginning, the standard deviation remains basically constant, and then the standard deviation shows an increasing change. Find the inflection point of the standard deviation as the basis for segmentation. The curve before the inflection point of the standard deviation uses linear fitting, and the curve after the inflection point of the standard deviation uses non-linear fitting.

[0096] The fitting method of the first - stage curve is the same as that of the charging characteristic curve, which will not be elaborated here.

[0097] The second - stage curve is fitted with a quadratic function of one variable, and its formula form is:

[0098] y = ax 2 + bx + C

[0099] where y is the percentage of battery charge, x is the discharge voltage, and a, b, and c are curve characteristic parameters. When calculating the curve characteristic parameters, directly take points at the starting position, middle position, and ending position on the second - stage curve shown in Figure 8 and convert the battery charge into a percentage of battery charge. The final point - taking results are (26.0, 0), (24.7, 43.72), (22.9, 91.24). Substitute them into the quadratic function of one variable, and we get:

[0100]

[0101] After solving, we get:

[0102]

[0103] The second - stage curve can also be fitted with a cubic function of one variable or Fourier transform.

[0104] S32. Obtain the first reference power according to the percentage of battery charge and the actual capacity.

[0105] Specifically, the percentage of battery charge and the actual power can be substituted into the first calculation formula to obtain the first reference power. The first calculation formula is:

[0106] y1 = hk

[0107] where y1 is the first reference power, h is the actual capacity, and k is the percentage of battery charge.

[0108] As Figure 4 shown, step S5 of the embodiment of the present application specifically includes:

[0109] S51. Filter the first reference power to obtain the filtered first reference power.

[0110] Specifically, perform Kalman filtering on the first reference power. In the Kalman filtering algorithm, the expected probability for the next time is calculated based on the historical input of the first reference power. After the first reference power is input this time, the filtered first reference power is obtained by combining the expected probability, and the filtered first reference power is the true first reference power.

[0111] S52. Substitute the second reference power, the true power obtained in the previous calculation period, and the filtered first reference power into the third calculation formula to obtain the true power. The third calculation formula is:

[0112] y s = y sq -(y2 - y sq ) × y′1 ÷ y2

[0113] where y s is the true power, y sq is the true power obtained in the previous calculation period, y′1 is the filtered first reference power, and y2 is the second reference power.

[0114] It should be understood that the magnitudes of the sequence numbers of the steps in the above embodiments do not imply the order of execution. The order of execution of each process should be determined according to its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.

[0115] As Figure 6 shown, the embodiments of the present application further provide a battery power detection device, including:

[0116] An acquisition module 40, configured to acquire the current of the battery, the voltage of the battery, and the number of power consumption cycles of the battery.

[0117] An actual capacity determination module 41, configured to determine the actual capacity of the battery according to the number of power consumption cycles.

[0118] A first reference power determination module 42, configured to determine the first reference power of the battery according to the voltage and the actual capacity.

[0119] A second reference power determination module 43, configured to determine the second reference power of the battery according to the current.

[0120] A true power determination module 44, configured to determine the true power of the battery according to the first reference power and the second reference power.

[0121] Specifically, the battery power detection device provided by the embodiments of the present application, wherein the acquisition module 40 is used to acquire the current of the battery, the voltage of the battery, and the number of charge-discharge cycles of the battery. The actual capacity determination module 41 is used to determine the actual capacity of the battery according to the number of charge-discharge cycles of the battery. The number of charge-discharge cycles of the battery is calculated based on the cumulative loss value of the battery power during the actual use time of the battery, which ensures the accuracy of the number of charge-discharge cycles of the battery, and further improves the accuracy of the actual capacity of the battery. The first reference power determination module 42 is used to determine the first reference power of the battery through the voltage and the actual capacity. Since the actual capacity of the battery is relatively accurate, the first reference power of the battery obtained is ensured according to the actual capacity of the battery and combined with the voltage of the battery. Due to the unstable voltage, the obtained first reference power is also unstable. The second reference power determination module 43 is used to determine the second reference power of the battery through the current, and uses the second reference power to eliminate the instability of the first reference power. The true power determination module 44 is used to determine the true power of the battery through the first reference power and the second reference power, and the errors of the first reference power and the second reference power are eliminated, which ensures the accuracy and stability of the true power. The battery power detection device provided by the embodiments of the present application can detect the power of lead-acid batteries with relatively high accuracy.

[0122] In one embodiment of the present application, the acquisition module 40 is further used for:

[0123] Calculating the cumulative loss value of the battery power;

[0124] Obtaining the number of charge-discharge cycles according to the cumulative loss value and the nominal capacity of the battery.

[0125] In one embodiment of the present application, the first reference power determination module 42 is further used for:

[0126] Substituting the voltage into the power consumption characteristic fitting curve to obtain the power percentage;

[0127] Obtaining the first reference power according to the power percentage and the actual capacity.

[0128] In one embodiment of the present application, the power consumption characteristic fitting curve is formed by fitting the power consumption characteristic curve.

[0129] In one embodiment of the present application, the first reference power determination module 42 is further used for:

[0130] Substituting the power percentage and the actual capacity into the first calculation formula to obtain the first reference power;

[0131] The first calculation formula is:

[0132] y1 = hk

[0133] Among them, y1 is the first reference power, h is the actual capacity, and k is the power percentage.

[0134] In one embodiment of the present application, the second reference power determination module 43 is further configured to:

[0135] Substitute the current into the second calculation formula to obtain the second reference power;

[0136] The second calculation formula is:

[0137]

[0138] Among them, y2 is the second reference power, i is the current, and t is the power consumption time.

[0139] In one embodiment of the present application, the true power determination module 44 is further configured to:

[0140] Filter the first reference power to obtain the filtered first reference power;

[0141] Substitute the second reference power, the true power obtained in the previous calculation period, and the filtered first reference power into the third calculation formula to obtain the true power;

[0142] The third calculation formula is:

[0143] y s = y sq -(y2 - y sq ) × y′1 ÷ y2

[0144] Among them, y s is the true power, y sq is the true power obtained in the previous calculation period, y′1 is the filtered first reference power, and y2 is the second reference power.

[0145] Those skilled in the art can clearly understand that for the convenience and simplicity of description, only the above-mentioned division of each functional unit and module is used as an example. In actual applications, the above functions can be allocated to different functional units and modules according to needs, that is, the internal structure of the device is divided into different functional units or modules to complete all or part of the functions described above. Each functional unit and module in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of a software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of mutual distinction and do not limit the protection scope of the present application. The specific working processes of the units and modules in the above system can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated here.

[0146] As shown Figure 7 in the figure, an embodiment of the present application further provides a battery power detection system, including a voltage sensor 52, a current sensor 50, and a controller 51. The voltage sensor 52 is used to collect the voltage of the battery and transmit the voltage to the controller 51. The current sensor 50 is used to collect the current of the battery and transmit the current to the controller 51. The controller 51 is used to obtain the current of the battery, the voltage of the battery, and the number of charge-discharge cycles of the battery; determine the actual capacity of the battery according to the number of charge-discharge cycles; determine the first reference power of the battery according to the voltage and the actual capacity; determine the second reference power of the battery according to the current; and determine the true power of the battery according to the first reference power and the second reference power.

[0147] Specifically, for the battery power detection system provided by the embodiment of the present application, the current sensor 50 is used to obtain the current of the battery and transmit the current to the controller 51. The voltage sensor 52 is used to obtain the voltage of the battery and transmit the voltage to the controller 51. The controller 51 is used to obtain the current of the battery, the voltage of the battery, and the number of charge-discharge cycles of the battery. According to the number of charge-discharge cycles, the actual capacity of the battery is determined. The number of charge-discharge cycles of the battery is calculated according to the cumulative loss value of the battery power during the actual use time of the battery, which ensures the accuracy of the number of charge-discharge cycles of the battery, and thus improves the accuracy of the actual capacity of the battery. According to the voltage and the actual capacity, the first reference power of the battery is determined. Since the actual capacity of the battery is relatively accurate, according to the actual capacity of the battery and combined with the voltage of the battery, the accuracy of the first reference power of the battery obtained is ensured. According to the current, the second reference power of the battery is determined. The second reference power is used to eliminate the problem that the first reference power obtained is unstable due to unstable voltage. According to the first reference power and the second reference power, the true power of the battery is determined, and the errors of the first reference power and the second reference power are eliminated, which ensures the accuracy and stability of the true power. Therefore, the battery power detection system provided by the embodiment of the present application can detect the lead-acid battery power with high precision.

[0148] To clearly show the detection effect of the above battery power detection system, the power of the battery pack is detected by using a multimeter and the battery power detection system provided by the embodiment of the present application respectively, and the detection data is shown in Table 1. Among them, the nominal capacity of the battery pack to be tested is 12.5 Ah, and the battery pack to be tested includes two batteries connected in series.

[0149] Table 1 Detection data of battery power

[0150]

[0151] As can be seen from Table 1, the relative error between the battery power obtained by the detection system provided in the embodiments of the present application and the actual power read by the multimeter is very small. Therefore, the battery power detection system provided in the embodiments of the present application can accurately detect the battery power.

[0152] The embodiments of the present application also provide a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is executed by a controller, the method described in any one of the above is implemented.

[0153] In the above embodiments, the descriptions of the respective embodiments have their own emphases. For parts not detailed or recorded in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

[0154] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A method for detecting the power of a lead-acid battery, characterized in that, Including: Obtaining the current of the battery, the voltage of the battery, and the number of charge-discharge cycles of the battery; Determining the actual capacity of the battery according to the number of charge-discharge cycles; Determining the first reference power of the battery according to the voltage and the actual capacity; Determining the second reference power of the battery according to the current; Determining the true power of the battery according to the first reference power and the second reference power; The determining the true power of the battery according to the first reference power and the second reference power includes: Filtering the first reference power to obtain a filtered first reference power; Substituting the second reference power, the true power obtained in the previous calculation cycle, and the filtered first reference power into a third calculation formula to obtain the true power; The third calculation formula is: y s = y sq -(y2 - y sq ) × y′1 ÷ y2 where y s is the actual power, y sq is the actual power obtained in the previous calculation period, y'1 is the first reference power after filtering, and y2 is the second reference power.

2. The method for detecting the power of a lead-acid battery according to claim 1, wherein, The obtaining the number of charge-discharge cycles of the battery includes: Calculating the cumulative loss value of the battery power; Obtaining the number of charge-discharge cycles according to the cumulative loss value and the nominal capacity of the battery.

3. The method for detecting the power of a lead-acid battery according to claim 1, wherein The determining the first reference power of the battery according to the voltage and the actual capacity includes: Substituting the voltage into the power consumption characteristic fitting curve to obtain the power percentage; Obtaining the first reference power according to the power percentage and the actual capacity.

4. The method for detecting the power of a lead-acid battery according to claim 3, characterized in that, The power consumption characteristic fitting curve is formed by fitting the power consumption characteristic curve.

5. The method for detecting the power of a lead-acid battery according to claim 3, characterized in that, The obtaining the first reference power according to the power percentage and the actual capacity includes: Substituting the power percentage and the actual capacity into a first calculation formula to obtain the first reference power; The first calculation formula is: y1 = hk Where y1 is the first reference power, h is the actual capacity, and k is the power percentage.

6. The method for detecting the power of a lead-acid battery according to claim 1, wherein The determining the second reference power of the battery according to the current includes: Substituting the current into a second calculation formula to obtain the second reference power; The second calculation formula is: Where y2 is the second reference power, i is the current, and t is the power consumption time.

7. A detection device for the power of a lead-acid battery, characterized in that, Including: An acquisition module for acquiring the current of the battery, the voltage of the battery, and the number of charge-discharge cycles of the battery; An actual capacity determination module for determining the actual capacity of the battery according to the number of charge-discharge cycles; A first reference power determination module for determining the first reference power of the battery according to the voltage and the actual capacity; A second reference power determination module for determining the second reference power of the battery according to the current; A true power determination module for determining the true power of the battery according to the first reference power and the second reference power; The true power determination module is further configured to filter the first reference power to obtain a filtered first reference power; Substituting the second reference power, the true power obtained in the previous calculation cycle, and the filtered first reference power into a third calculation formula to obtain the true power; The third calculation formula is: y s = y sq -(y2 - y sq )×y ′ 1÷y2 Among them, y s is the actual power, y sq is the actual power obtained in the previous calculation period, y ′ 1 is the first reference power after filtering, and y2 is the second reference power.

8. A detection system for the power of a lead-acid battery, characterized in that, Including a voltage sensor, a current sensor, and a controller; The voltage sensor is configured to collect the voltage of the battery and transmit the voltage to the controller; The current sensor is used to collect the current of the battery and transmit the current to the controller; The controller is used to execute the method according to any one of claims 1-6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the controller, the method according to any one of claims 1 to 6 is implemented.

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