A detection device for mobile power supply power

Abstract

The application discloses a kind of detection devices for mobile power electric quantity, it is related to detection device technical field, including equipment shell;The application is convenient for detecting the reserve condition of mobile power by the cooperation of circuit assembly and display screen, realizes the ability of correction mobile power reserve, again by the cooperation of fan and dust plate, air in circulating device is accelerated to circuit assembly for cooling;By obtaining and analyzing the historical use data of mobile power, it is determined whether the abnormality of mobile power is caused by inaccurate detection data due to use loss, and then the change of environmental temperature, environmental humidity and environmental pressure on the change of mobile power resistance is detected, to determine whether the resistance change caused by environmental factors will affect the abnormality judgment of mobile power, to prevent the inaccuracy of detection data caused by use loss or environmental factor change, affect the accuracy of abnormality judgment of mobile power.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of detection devices, in particular to a detection device for the power of a mobile power supply. BACKGROUND

[0002] In order to prolong the endurance of electronic devices, the most effective way is to use an external mobile power supply to supply power to the electronic device. The mobile power supply is an energy storage device, and its performance is usually tested before leaving the factory to ensure the safe operation and energy storage capacity of the mobile power supply. However, after long-term use of the mobile power supply, the mobile power supply will have problems such as inaccurate voltage, false high power and reduced maximum storage capacity, so it is necessary to detect the power again to ensure the normal use of the mobile power supply.

[0003] The existing detection equipment is usually a large fixed detection equipment in the factory or a small multifunctional detection equipment in the laboratory. The former is used for one-time detection of multiple power supplies, and has high cost and poor portability. The latter is used for high-precision detection in the laboratory, and has high cost and complex operation.

[0004] During the use of the mobile power supply, accurately judging its performance and health status is crucial to protect user experience and use safety. Currently, the detection of the mobile power supply mainly focuses on the measurement of its basic electrical parameters such as voltage, current and resistance. The existing detection technology mostly evaluates the state of the mobile power supply based on single measurement data. This method does not fully consider the cumulative effect of the mobile power supply in the long-term use process, and lacks detection and analysis of the relationship between environmental factors and changes in the resistance of the mobile power supply, resulting in inaccurate detection data, which makes it impossible to obtain accurate results when detecting the power of the mobile power supply.

[0005] Therefore, the present application improves the existing equipment in view of the above problems. SUMMARY

[0006] The purpose of the present application is to solve the problems existing in the prior art and provide a detection device for the power of a mobile power supply.

[0007] In order to achieve the above purpose, the present application adopts the following technical scheme: a detection device for the power of a mobile power supply, comprising a device shell, a top cover is fixedly installed on the top surface of the device shell, and an electric circuit assembly and a heat dissipation assembly are arranged inside the device shell.

[0008] The electric circuit assembly further comprises a monitoring module, and the monitoring module comprises a power monitoring unit and a loss monitoring unit.

[0009] The power monitoring unit detects the output voltage data of the mobile power supply during the detection process of the power of the mobile power supply, analyzes the detected output voltage data, and judges which abnormal conditions exist in the mobile power supply.

[0010] The loss monitoring unit retrieves and analyzes the historical usage data of the mobile power supply to determine whether the abnormality of the mobile power supply detected by the power detection unit is caused by the loss of the mobile power supply or changes in environmental factors.

[0011] Preferably, the circuit assembly includes a circuit board, four through holes are opened around the circuit board, fixing screws are provided in the through holes, and the circuit board is fixed to the bottom surface of the device shell by fixing screws.

[0012] Preferably, a mounting opening is provided on one side of the back side of the device shell, a transformer is installed in the mounting opening, one end of the transformer on the outside of the device shell is connected to a charging cable, one end of the transformer on the inside of the device shell is connected to one side of the rear end of the top surface of the circuit board through a wire, the other side of the rear end of the top surface of the circuit board is connected to a lithium battery through a wire, and the top surface of the lithium battery is fixedly connected to the rear end of the bottom surface of the top cover.

[0013] Preferably, a plurality of rated resistors are connected at equal intervals on the rear portion of the top surface of the circuit board, a plurality of comparison circuits are fixedly connected to the top surface of the circuit board in front of the rated resistors, a calculation unit is fixedly connected to the top surface of the circuit board in front of the comparison circuits, and a display unit and an alarm unit are respectively fixedly connected to the top surface of the circuit board in front of the calculation unit.

[0014] Preferably, one side of the front end of the top surface of the circuit board is connected to a control circuit through a wire, and the control circuit is installed and fixed in the middle of the front end of the device shell. One side of the front end of the control circuit is equidistantly connected to USB interfaces, and a warning light is installed on one side of the USB interface. The rear end of the bottom surface of the control circuit is connected to a display screen through a wire, and the display screen is installed and fixed at the front end of the top cover.

[0015] Preferably, the heat dissipation component includes a device shell, and ventilation strips are opened on both side walls of the device shell. A fan is provided at the ventilation strip on one side of the device shell, and a dustproof plate is installed and fixed at the ventilation strip on the inner side of the device shell.

[0016] Preferably, the power monitoring unit performs the following steps to process the output voltage data:

[0017] Step 1: Establish a coordinate system for power and output voltage data, and draw coordinate points within the coordinate system; the power detection unit obtains a relationship curve between power and output voltage, then detects the output voltage data corresponding to the remaining power when the mobile power supply outputs power, and substitutes the detected voltage data into the relationship curve between power and output voltage, obtains curve power data corresponding to the corresponding voltage data on the relationship curve, and compares the curve power data with the remaining power data. If the difference between the curve power data and the remaining power data is greater than a preset power comparison threshold, it is determined that the mobile power supply has an inaccurate meter.

[0018] Step two: calculate the change curve of the electric quantity with time according to the output voltage and electric quantity relationship curve, and calculate the slope value of each line segment on the electric quantity and time change curve, which is recorded as the estimated electric quantity decline rate; detect the output voltage data of the mobile power supply in the set time period, and according to the electric quantity and output voltage relationship curve, the electric quantity change of the mobile power supply in the set time period can be obtained, and the corresponding electric quantity decline rate value of the mobile power supply is calculated according to the electric quantity change of the mobile power supply. If the ratio of the estimated electric quantity decline rate to the calculated electric quantity decline rate is greater than a preset ratio threshold one, it is determined that the mobile power supply has a false high electric quantity condition;

[0019] Step three: obtain the charge and discharge record of the mobile power supply, randomly select a plurality of groups of total electric quantity data of the mobile power supply from full power to power depletion, calculate the average value of the selected total electric quantity data, and record the obtained total electric quantity average value as the average actual maximum inventory of the mobile power supply; compare the average actual maximum inventory with the standard maximum inventory marked on the mobile power supply at the factory, and if the ratio of the average actual maximum inventory to the standard maximum inventory marked on the mobile power supply at the factory is less than a preset ratio threshold two, it is determined that the mobile power supply has a maximum inventory reduction condition.

[0020] Preferably, the judgment of the power monitoring unit on the use loss of the mobile power supply is as follows:

[0021] Step one: obtain the historical use data of the mobile power supply, the product of the discharge quantity and the number of times of the mobile power supply each time divided by the capacitance data of the mobile power supply is the discharge depth data of the mobile power supply this time, calculate the discharge depth data generated by the mobile power supply each time in the historical data, that is, the total discharge quantity data, and the total discharge quantity data divided by 100% obtains the estimated cycle number of the mobile power supply;

[0022] Step two: compare the estimated cycle number of the mobile power supply with the cycle number corresponding to the normal service life of the mobile power supply battery, and if the ratio of the estimated cycle number to the cycle number corresponding to the normal service life is greater than a preset ratio threshold three, it is determined that the mobile power supply has use loss; otherwise, the influence of environmental factors is judged.

[0023] Preferably, the judgment of the power monitoring unit on the influence of environmental factors is as follows:

[0024] Step one: for the lithium ion battery in the mobile power supply, the relationship between its internal resistance Rw and temperature T is as follows: Rw=A+B / T+C / T*T, wherein A, B and C are constants;

[0025] Step two: set the temperature range, and divide the temperature range evenly into n temperature points, at each selected temperature point, measure the internal resistance of the lithium ion battery of the mobile power supply, remove the outliers in each group of data, then calculate the mean value, and substitute the obtained internal resistance mean value at the corresponding temperature point into the internal resistance Rw and temperature relationship formula to calculate the specific values of A, B and C, then substitute A, B and C into the internal resistance Rw and temperature relationship formula;

[0026] Step three: the influence relationship of environmental humidity SD on the resistance Rs of the mobile power supply is Rs=Ro+k*SD, Ro is the initial resistance value of the mobile power supply in a dry environment, and k is a preset coefficient;

[0027] Step four: the influence relationship of air pressure P on the resistance Rq of the mobile power supply is Rq=Rqo+m*(P-Po), Rqo is the resistance value of the mobile power supply under the initial air pressure Po, and m is a preset coefficient; for circuit components, the influence relationship of equivalent resistance Rd and air pressure P is Rd=Rdo+e*(P-Po), Rdo is the equivalent resistance value of the circuit component under the initial air pressure Po, and e is a preset coefficient;

[0028] Step five: the influence relationship weight coefficients of temperature, humidity and air pressure on the resistance of the mobile power supply are preset, denoted as w1, w2, w3 and w4, then the influence of environmental factors on the resistance of the mobile power supply is Rz=w1*Rw+w2*Rs+w3*Rq+w4*Rd, the resistance value R of the mobile power supply is compared with the affected resistance value Rz, if |1-(Rz / R)|<0.1, it is determined that the resistance value R of the mobile power supply has not changed; otherwise, the resistance value of the mobile power supply is Rz, and the abnormality of the mobile power supply is re-judged according to the resistance value Rz.

[0029] Compared with the prior art, the beneficial effects of the present application are:

[0030] 1. By cooperating the circuit assembly and the display screen, the storage condition of the mobile power supply can be detected, the capacity of the mobile power supply storage can be corrected, the air in the circulating device can be accelerated by cooperating the fan and the dustproof plate, the cooling capacity of the circuit assembly can be realized, the problems of mobile power supply power reserve reduction and display error are solved, the device is simple to operate, and the detection efficiency is improved, and the detection error caused by complex operation is reduced.

[0031] 2, through the acquisition and analysis of the mobile power supply historical use data, according to the discharge depth of the mobile power supply each time, the cycle number of the mobile power supply is obtained, and compared with the cycle number corresponding to the service life of the mobile power supply, whether the abnormality of the mobile power supply is caused by the inaccurate detection data caused by the use loss is determined, then the change of the resistance caused by the change of the environmental temperature, the environmental humidity and the environmental pressure is detected, whether the resistance change caused by the environmental factors will affect the abnormality judgment of the mobile power supply is determined, the inaccurate detection data caused by the use loss or the change of the environmental factors is prevented, and the accuracy of the abnormality judgment of the mobile power supply is affected. BRIEF DESCRIPTION OF DRAWINGS

[0032] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application, the illustrative embodiments of the present application and the description thereof are used to explain the present application, and do not constitute improper limitation on the present application. In the drawings:

[0033] Figure 1 The overall appearance of the device proposed by the present application is shown in the perspective view;

[0034] Figure 2 The overall appearance of the device proposed by the present application is shown in the perspective view;

[0035] Figure 3 The internal structure of the device proposed by the present application is shown in the perspective view;

[0036] Figure 4 The circuit structure of the device proposed by the present application is shown in the perspective view;

[0037] Figure 5 The circuit component structure of the device proposed by the present application is shown in the perspective view;

[0038] Figure 6 The system flowchart of the present application is shown in the perspective view.

[0039] In the figure, the serial number: 1, the equipment shell; 2, the top cover; 3, the circuit board; 4, the fixing screw; 5, the transformer; 6, the lithium battery; 7, the rated resistance; 8, the comparison circuit; 9, the calculation unit; 10, the display unit; 11, the alarm unit; 12, the control circuit; 13, the display screen; 14, the fan; 15, the dustproof plate. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0041] Embodiment: see Figures 1-6The utility model discloses a kind of detection devices for the electric quantity of mobile power supply, including equipment shell 1, top cover 2 is fixedly installed on the top surface of equipment shell 1, circuit assembly and heat dissipation assembly are equipped inside equipment shell 1, modular design facilitates to equipment overhaul and upgrade, improve practicality;Circuit assembly includes circuit board 3, four through holes are opened around circuit board 3, fixed screw 4 is equipped in through hole, circuit board 3 is fixedly installed on the bottom surface inside equipment shell 1 by fixed screw 4, installation port is opened in the back surface of equipment shell 1, transformer 5 is installed in installation port, transformer 5 is connected with charging line on the one end outside equipment shell 1, transformer 5 is connected with the top surface rear end side of circuit board 3 by wire on the one end inside equipment shell 1, lithium battery 6 is connected with the top surface rear end other side of circuit board 3 by wire, lithium battery 6 top surface is fixedly connected in the bottom surface rear end of top cover 2, by the cooperation of transformer 5 and lithium battery 6, it is convenient for device standby and charging device, improve practicality.

[0042] Circuit assembly further includes monitoring module, and the monitoring module includes power monitoring unit, loss monitoring unit;

[0043] The output voltage value of the mobile power supply is detected by the detection device, the voltage data detected at the same time is calculated, the difference between the detected voltage data and the voltage average is calculated, the absolute value of the calculated difference is calculated, the average of the calculated difference absolute value is taken as the preset voltage comparison threshold, and the absolute value of the calculated difference is compared with the preset voltage comparison threshold, if the absolute value of the calculated difference is greater than the preset voltage comparison threshold, the voltage data corresponding to the calculated difference absolute value is determined as abnormal data, after comparison, the voltage data determined as abnormal data is removed, the average voltage data of the remaining voltage data is calculated, and the calculated average voltage data is recorded as the voltage data detected at the corresponding time.

[0044] Get the same model mobile power supply sample, detect the electric quantity and output voltage data of the mobile power supply sample under the preset standard test condition, remove the abnormal value of the detection data at the same time, calculate the average of the remaining data, get the electric quantity data and output voltage data corresponding to the time, establish the coordinate system of the electric quantity and output voltage data, and draw the coordinate points in the coordinate system;The power detection unit obtains the relationship curve between the electric quantity and the output voltage, and then detects the output voltage data corresponding to the remaining electric quantity when the mobile power supply is powered, and substitutes the detected voltage data into the relationship curve between the electric quantity and the output voltage, obtains the curve electric quantity data corresponding to the corresponding voltage data on the relationship curve, and compares the curve electric quantity data with the remaining electric quantity data, if the difference between the curve electric quantity data and the remaining electric quantity data is greater than the preset electric quantity comparison threshold, it is determined that the mobile power supply has inaccurate display condition.

[0045] According to the output voltage and the relationship between the amount of electricity curve, the change curve of the amount of electricity with time is calculated, and the slope value of each line segment on the amount of electricity and time change curve is calculated, which is recorded as the estimated amount of electricity decline rate; the output voltage data of the mobile power supply in the set time period is detected, and according to the relationship curve between the amount of electricity and the output voltage, the amount of electricity change of the mobile power supply in the set time period can be obtained, the corresponding amount of electricity decline rate value of the mobile power supply is calculated according to the amount of electricity change of the mobile power supply, and the estimated amount of electricity decline rate is compared with the calculated amount of electricity decline rate, if the ratio of the estimated amount of electricity decline rate and the calculated amount of electricity decline rate is greater than the preset ratio threshold one, it is determined that the mobile power supply exists the condition of virtual high amount of electricity;

[0046] The charging and discharging records of the mobile power supply are obtained, a plurality of groups of total amount of electricity data of the mobile power supply from full power to power consumption are randomly selected, the average value of the selected total amount of electricity data is calculated, and the obtained total amount of electricity average value is recorded as the average actual maximum inventory of the mobile power supply; the average actual maximum inventory is compared with the standard maximum inventory marked by the mobile power supply when it leaves the factory, and if the ratio of the average actual maximum inventory and the standard maximum inventory marked by the mobile power supply when it leaves the factory is less than the preset ratio threshold two, it is determined that the mobile power supply exists the condition of maximum inventory reduction.

[0047] The historical use data of the mobile power supply is obtained, the product of the discharge capacity and the number of times of the mobile power supply each time is divided by the capacitance data of the mobile power supply, that is, the discharge depth data of the mobile power supply this time, the discharge depth data generated by the mobile power supply each time in the historical data is calculated, that is, the total discharge capacity data, and the total discharge capacity data is divided by 100% to obtain the estimated cycle number of the mobile power supply; the estimated cycle number of the mobile power supply is compared with the cycle number corresponding to the normal service life of the mobile power supply battery, and if the ratio of the estimated cycle number and the cycle number corresponding to the normal service life is greater than the preset ratio threshold three, it is determined that the mobile power supply has generated use loss; otherwise, the influence caused by the environment is judged.

[0048] The change of environmental factors will cause the change of internal resistance of the mobile power supply. When the environmental temperature changes, in the high temperature environment, the viscosity of the electrolyte inside the battery decreases, the ion diffusion speed accelerates, but at the same time the interface resistance between the electrode material and the electrolyte may increase, thereby affecting the overall internal resistance of the battery; in the low temperature environment, the viscosity of the electrolyte of the lithium ion battery increases, the ion diffusion speed slows down, resulting in the increase of the internal resistance of the battery, and at the same time the discharge capacity of the battery will also decrease; for the lithium ion battery in the mobile power supply, the relationship between the internal resistance Rw and the temperature T is as follows: Rw=A+B / T+C / T*T, wherein A, B and C are constants; set the temperature range, and divide the temperature range into n temperature points uniformly, measure the internal resistance of the lithium ion battery of the mobile power supply at each selected temperature point, remove the abnormal values in each group of data, calculate the mean value, and substitute the obtained internal resistance mean value at the corresponding temperature point into the internal resistance Rw and temperature relationship formula to calculate the specific values of A, B and C, and then substitute A, B and C into the internal resistance Rw and temperature relationship formula;

[0049] In a high humidity environment, water may react with the surface of the battery electrode to form corrosion products. After the surface of the lithium ion battery electrode is corroded, the embedding and extraction process of lithium ions will be affected, thereby increasing the internal resistance of the battery; water may cause the metal parts such as solder joints and wires in the circuit to rust, and the resistance of the rusted metal parts will increase significantly, affecting the normal work of the mobile power supply; the relationship between environmental humidity SD and the resistance Rs of the mobile power supply is: Rs=Ro+k*SD, wherein Ro is the initial resistance value of the mobile power supply in a dry environment, and k is a preset coefficient;

[0050] For circuit elements, too high air pressure will cause some poorly sealed elements to be squeezed, changing their internal structure and connection, thereby affecting their equivalent resistance; in a low air pressure environment, the battery expands due to the decrease of external air pressure, causing the battery shell to deform, affecting the contact between the battery electrode and the electrolyte, thereby increasing the internal resistance of the battery; the relationship between air pressure P and the resistance Rq of the mobile power supply is: Rq=Rqo+m*(P-Po), wherein Rqo is the resistance value of the mobile power supply under the initial air pressure Po, and m is a preset coefficient; for circuit elements, the relationship between the equivalent resistance Rd and the air pressure P is: Rd=Rdo+e*(P-Po), wherein Rdo is the equivalent resistance value of the circuit element under the initial air pressure Po, and e is a preset coefficient;

[0051] The influence weight coefficients of temperature, humidity and air pressure on the resistance of the mobile power supply are preset, and are denoted as w1, w2, w3 and w4, the influence of the environmental factors on the resistance of the mobile power supply is Rz=w1*Rw+w2*Rs+w3*Rq+w4*Rd, the resistance value R of the mobile power supply is compared with the influenced resistance value Rz, if |1-(Rz / R)|<0.1, it is determined that the resistance value R of the mobile power supply does not change, otherwise, it is determined that the resistance value of the mobile power supply is Rz, and the abnormality of the mobile power supply is judged again according to the resistance value Rz.

[0052] In the application, a plurality of rated resistors 7 are arranged equidistantly on the top surface of the circuit board 3, a plurality of comparison circuits 8 are fixed on the top surface of the circuit board 3 in front of the rated resistors 7, a calculation unit 9 is fixed on the top surface of the circuit board 3 in front of the comparison circuits 8, a display unit 10 and an alarm unit 11 are respectively fixed on the top surface of the circuit board 3 in front of the calculation unit 9, a control circuit 12 is connected to one side of the front end of the top surface of the circuit board 3 through a wire, the control circuit 12 is installed and fixed in the middle of the front end of the equipment shell 1, a USB interface is arranged equidistantly on one side of the front end of the control circuit 12, a warning light is installed on one side of the USB interface, a display screen 13 is connected to the bottom surface of the control circuit 12 through a wire, and the display screen 13 is installed and fixed on the front end of the top cover 2. Through the cooperation of the control circuit 12 and the display screen 13, the detection situation can be displayed in real time, and the practicability is improved. The heat dissipation assembly comprises the equipment shell 1, ventilation strip openings are formed in the side walls of the equipment shell 1, a fan 14 is arranged at the ventilation strip opening on one side of the equipment shell 1, and a dustproof plate 15 is installed and fixed at the ventilation strip opening on the inner side of the equipment shell 1. Through the cooperation of the fan 14 and the dustproof plate 15, the air in the circulating device can be accelerated, and the practicability is improved.

[0053] Working principle: when the application is used, first of all, ensure that the lithium battery 6 has electricity, if there is no electricity, the lithium battery 6 can be charged through the charging wire behind the transformer 5, after the charging is completed, the control circuit 12 is started, then the target power supply is connected to the device through the USB connection port on the control circuit 12, when the target power supply has no electricity, the control circuit 12 controls the lithium battery 6 to charge the target power supply, when the target power supply has electricity, the control circuit 12 controls the target power supply to supply power to the circuit assembly, the current enters the comparison circuit 8 after the voltage is reduced by the equal ratio of the rated resistor 7, then enters the calculation unit 9 under the action of the comparison circuit 8, then the data calculated by the calculation unit 9 is translated into a digital signal through the display unit 10, then the data is displayed on the display screen 13 through the control circuit 12, and finally the mobile power supply capacity is detected. During the detection period, the circuit assembly works and generates heat, when the circuit assembly reaches a certain temperature, the control circuit 12 starts the fan 14, so that the air in the device flows quickly and takes away the heat.

[0054] The above merely describes preferred specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art, according to the technical solution and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.

Claims

1. A detection device for mobile power supply electric quantity, comprising a device shell (1), characterized in that: The device shell (1) top surface is fixedly provided with a top cover (2), and the device shell (1) is internally provided with a circuit assembly and a heat dissipation assembly; The circuit assembly further comprises a monitoring module, and the monitoring module comprises a power monitoring unit and a loss monitoring unit; The power monitoring unit detects the output voltage data of the mobile power supply during the mobile power supply power detection process, analyzes the detected output voltage data, and determines the abnormal conditions of the mobile power supply; The loss monitoring unit retrieves and analyzes the historical use data of the mobile power supply, and determines whether the mobile power supply abnormality detected by the power detection unit is caused by the use loss of the mobile power supply or the change of environmental factors; The judgment of the loss monitoring unit on the influence of environmental factors is as follows: Step one: for the lithium ion battery in the mobile power supply, the internal resistance has the following relationship with temperature : where , , is a constant; Step two: set the temperature range, and divide the temperature range into temperature points evenly, at each selected temperature point, measure the internal resistance of the lithium-ion battery of the mobile power supply, remove the outliers in each group of data, then calculate the mean value, and substitute the obtained internal resistance mean value at the corresponding temperature point into the internal resistance and temperature relationship formula, calculate the specific value of , , , and then substitute , , into the internal resistance and temperature relationship formula; Step three: environmental humidity The influence relationship of the mobile power supply resistance The influence relationship of the mobile power supply resistance , The initial resistance value of the mobile power supply in a dry environment, The preset coefficient; Step 4: Air Pressure Resistors for mobile power supplies The influence relationship: , is the initial air pressure The resistance value of the mobile power supply under is the preset coefficient; for circuit components, its equivalent resistance and air pressure The influence relationship: , is the initial air pressure The equivalent resistance value of the circuit components below, is the preset coefficient; Step five: preset the weight coefficient of the influence of temperature, humidity and air pressure on the resistance of the mobile power supply, denoted as 、 、 、 The influence of environmental factors on the resistance of the mobile power supply , compare the resistance value of the mobile power supply with the affected resistance value , if , it is determined that the resistance value of the mobile power supply has not changed; otherwise, it is determined that the resistance value of the mobile power supply is , and the abnormality of the mobile power supply is re-judged according to the resistance value .

2. The device for detecting the power of a mobile power supply according to claim 1, characterized in that: The circuit assembly comprises a circuit board (3), four through holes are formed around the circuit board (3), and a fixing screw (4) is arranged in each through hole; the circuit board (3) is fixedly installed on the inner bottom surface of the device shell (1) through the fixing screw (4).

3. The device for detecting the power of a mobile power supply according to claim 2, characterized in that: A mounting port is formed on one side of the back surface of the device shell (1), a transformer (5) is mounted in the mounting port, one end of the transformer (5) outside the device shell (1) is connected with a charging line, and the other end of the transformer (5) inside the device shell (1) is connected with the top surface rear end of the circuit board (3) through a wire; the top surface rear end of the circuit board (3) is connected with a lithium battery (6) through a wire, and the top surface of the lithium battery (6) is fixedly connected with the bottom surface rear end of the top cover (2).

4. The device for detecting the power of a mobile power supply according to claim 3, characterized in that: A plurality of rated resistors (7) are arranged on the top surface rear part of the circuit board (3) at equal intervals, a plurality of comparison circuits (8) are fixedly connected to the front of the rated resistors (7) on the top surface of the circuit board (3), a calculation unit (9) is fixedly connected to the front of the comparison circuits (8) on the top surface of the circuit board (3), and a display unit (10) and an alarm unit (11) are respectively fixedly connected to the front of the calculation unit (9) on the top surface of the circuit board (3).

5. The device for detecting the amount of power in a mobile power supply according to claim 4, wherein: A control circuit (12) is connected to the front end of the top surface of the circuit board (3) through a wire, the control circuit (12) is fixedly installed on the front end of the device shell (1), USB interfaces are arranged on the front end of the control circuit (12) at equal intervals, warning lights are arranged on one side of the USB interfaces, a display screen (13) is connected to the bottom surface rear end of the control circuit (12) through a wire, and the display screen (13) is fixedly installed on the front end of the top cover (2).

6. The device for detecting the power of a mobile power supply according to claim 1, characterized in that: The heat dissipation assembly comprises a device shell (1), ventilation strip openings are formed in the side walls of the device shell (1), a fan (14) is arranged at the ventilation strip opening on one side of the device shell (1), and a dustproof plate (15) is fixedly installed at the ventilation strip opening on the inner side of the device shell (1).

7. The device for detecting the power of a mobile power supply according to claim 1, characterized in that: The data processing steps of the power monitoring unit on the detected output voltage data are as follows: Step one: establish the coordinate system of the power and output voltage data, draw the coordinate points in the coordinate system; the power detection unit obtains the relationship curve between the power and the output voltage, and then detects the output voltage data corresponding to the remaining power when the power supply is powered, and substitutes the detected voltage data into the relationship curve between the power and the output voltage, obtains the curve power data corresponding to the voltage data on the relationship curve, and compares the curve power data with the remaining power data, if the difference between the curve power data and the remaining power data is greater than the preset power comparison threshold, it is determined that the mobile power supply has a table electric inaccuracy; Step two: calculate the power change curve with time according to the output voltage and power relationship curve, calculate the slope value of each line segment on the power and time change curve, and record it as the estimated power decline rate; detect the output voltage data of the mobile power supply in the set time period, and according to the relationship curve between the power and the output voltage, the power change of the mobile power supply in the set time period is obtained, and the corresponding power decline rate value of the mobile power supply is calculated according to the power change of the mobile power supply, if the ratio of the estimated power decline rate and the calculated power decline rate is greater than the preset ratio threshold one, it is determined that the mobile power supply has a power overestimation; Step three: obtain the charge and discharge record of the mobile power supply, randomly select a plurality of groups of total power data of the mobile power supply from full power to power depletion, calculate the average value of the selected total power data, and record the obtained total power average as the average actual maximum capacity of the mobile power supply; Compare the average actual maximum capacity with the standard maximum capacity marked by the mobile power supply when it leaves the factory, if the ratio of the average actual maximum capacity and the standard maximum capacity marked by the mobile power supply when it leaves the factory is less than the preset ratio threshold two, it is determined that the mobile power supply has a maximum capacity reduction.

8. The device for detecting the power of a mobile power supply according to claim 1, characterized in that: The judgment of the mobile power supply usage loss by the loss monitoring unit is as follows: Step one: obtain the historical usage data of the mobile power supply, the product of the discharge capacity and the number of times of the mobile power supply each time divided by the capacitance data of the mobile power supply, that is, the discharge depth data of the mobile power supply this time, calculate the discharge depth data generated by the mobile power supply each time in the historical data, that is, the total discharge capacity data, and the total discharge capacity data divided by 100% to obtain the estimated cycle number of the mobile power supply; Step two: compare the estimated cycle number of the mobile power supply with the cycle number corresponding to the normal service life of the mobile power supply battery, if the ratio of the estimated cycle number and the cycle number corresponding to the normal service life is greater than the preset ratio threshold three, it is determined that the mobile power supply has a usage loss; otherwise, the influence of environmental factors is determined.

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