A method and device for detecting power battery capacity based on ultrasonic detection

Abstract

The present invention discloses a power battery capacity detection device based on ultrasonic detection, comprising a workbench, a bracket provided on the workbench, a cross slide mounted on the bracket, an ultrasonic transceiver probe connected to the bottom end of the cross slide, and a pressure sensor and a temperature sensor integrated on the ultrasonic transceiver probe. A power battery capacity detection method based on ultrasonic detection, which divides the main surface of the power battery into n small blocks evenly according to the area, and marks the midpoint of the n small blocks as the detection point. The present application is used to obtain the mapping relationship between the remaining power of the power battery and the characteristics of its internal ultrasonic signal. The position of the ultrasonic transceiver probe can be adjusted by controlling the cross slide, and finally a mapping relationship table between the remaining power of the power battery and the average sound time and sound amplitude of the ultrasonic detection signal at temperature T is formed. The detection is accurate and fast, and the temperature and pressure are kept constant during the detection process, thereby reducing errors.

Description

Technical Field

[0001] The present invention relates to the field of battery detection, and in particular to a method and device for detecting the capacity of a power battery based on ultrasonic detection. Background Art

[0002] Power batteries are the power source for tools, primarily those used in electric vehicles, electric trains, electric bicycles, and golf carts. They differ from starting batteries used to start automobile engines. Commonly used batteries include valve-sealed lead-acid batteries, open-type tubular lead-acid batteries, and lithium iron phosphate batteries.

[0003] Currently, to determine the actual discharge capacity of a power battery under specified conditions, the battery must first be fully charged and then discharged for a long period of time, until the battery reaches the discharge cutoff voltage. The actual discharge capacity of the lithium-ion battery under specified conditions is then calculated based on the discharge time and discharge current. However, currently, determining the actual discharge capacity of a power battery under specified conditions takes a long time, typically no less than 11 hours, and the detection process is complex and time-consuming. Therefore, achieving rapid and accurate capacity detection of a power battery is the technical problem addressed by the present invention. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the present invention provides a method and device for detecting the capacity of a power battery based on ultrasonic detection, which solves the problems in the background technology.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a power battery capacity detection device based on ultrasonic detection, comprising a workbench, a bracket is provided on the workbench, a cross slide is installed on the bracket, the bottom end of the cross slide is connected to an ultrasonic transceiver probe, the ultrasonic transceiver probe is integrated with a pressure sensor and a temperature sensor, the ultrasonic transceiver probe is connected to a display screen, a power battery is installed on the workbench, and the power battery is connected to a power battery charging and discharging instrument.

[0006] It is further defined that a topless glass cover is provided on the workbench, and the bracket and the power battery are both located inside the topless glass cover.

[0007] It is further defined that a heater is provided on the inner side of the topless glass cover.

[0008] It is further defined that the ultrasonic transceiver probe is connected to the bottom end of the cross slide by tightening bolts.

[0009] It is further defined that the ultrasonic transceiver probe detection surface is provided with ultrasonic transceiver contacts, temperature sensor contacts and pressure sensor contacts.

[0010] A method for detecting the capacity of a power battery based on ultrasonic detection.

[0011] Divide the main surface of the power battery into n small blocks evenly according to the area, and mark the midpoint of these n small blocks as the detection point;

[0012] Start the power battery charge and discharge instrument and record the battery power Y i , start the ultrasonic transceiver probe, operate the controller of the cross slide to make the ultrasonic transceiver probe traverse n detection points of the power battery, adjust the tightness of the tightening bolts to keep the pressure of the ultrasonic transceiver probe consistent at n detection points, and record the image on the ultrasonic imaging display screen at each detection point;

[0013] Extract n ultrasonic sound time of flight (TOF) and n ultrasonic sound amplitudes A from n groups of images respectively, and remove the maximum value of TOF. i max 、A i max and minimum TOF i min 、A i min , for the remaining n-2 sound time TOF i j Harmonic amplitude A i j The data is averaged to obtain the average ultrasonic sound time Harmonic Amplitude

[0014] Continue to charge and discharge the power battery, repeat the test steps, and obtain a series of Y i and and The corresponding data between them eventually forms a mapping relationship table between the remaining power of the power battery at temperature T and the average sound time and sound amplitude of the ultrasonic detection signal.

[0015] The present invention has the following beneficial effects: This application is used to obtain the mapping relationship between the remaining power of the power battery and its internal ultrasonic signal characteristics. By controlling the cross slide, the position of the ultrasonic transceiver probe can be adjusted, and finally a mapping relationship table of the remaining power of the power battery and the average sound time and sound amplitude of the ultrasonic detection signal at temperature T is formed. The detection is accurate and fast, and the temperature and pressure are kept constant during the detection process, thereby reducing errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the present invention;

[0017] Figure 2 Schematic diagram of the detection point position of the present invention;

[0018] Figure 3This is a schematic diagram of the end face of the ultrasonic transceiver probe of the present invention.

[0019] In the figure: 1. Workbench; 2. Power battery; 3. Ultrasonic transceiver probe; 4. Bracket; 5. Cross slide; 6. Slide controller; 7. Power battery charger and discharger; 8. Display; 9. Topless glass cover; 10. Heater; 11. Detection point; 12. Temperature sensor contact; 13. Pressure sensor contact; 14. Ultrasonic transceiver contact. DETAILED DESCRIPTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0021] See also Figure 1 The present invention provides a technical solution: a power battery capacity detection device based on ultrasonic detection, comprising a workbench 1, a bracket 4 is provided on the workbench 1, a cross slide 5 is installed on the bracket 4, and a slide controller 6 for controlling it is provided on the cross slide 5, the bottom end of the cross slide 5 is connected to an ultrasonic transceiver probe 3 by tightening bolts, which can emit ultrasonic waves in the frequency range of 0.5MHz-10MHz, the slide controller 6 controls the cross slide 5 to drive the ultrasonic transceiver probe 3 to move horizontally and vertically, the spacing between the ultrasonic transceiver probes 3 can be fine-tuned by tightening bolts to ensure that the pressure fluctuations of the ultrasonic transceiver probes 3 at n measuring points are within the allowable error limit, the ultrasonic transceiver probe 3 is integrated with a pressure sensor and a temperature sensor, the detection surface of the ultrasonic transceiver probe 3 is provided with an ultrasonic transceiver contact 14, a temperature sensor contact 12 and a pressure sensor contact 13, realizing three functions of one point, the ultrasonic transceiver probe 3 is connected to a display screen 8, a power battery 2 is installed on the workbench 1, and the power battery 2 is connected to a charge and discharge instrument 7, which can simultaneously charge and discharge the power battery 2 and display the remaining power of the power battery 2.

[0022] The workbench 1 is provided with a topless glass cover 9, and the bracket 4 and the power battery 2 are both located on the inner side of the topless glass cover 9. The topless glass cover 9 is used to facilitate observation of the internal situation of the device and to facilitate manipulation of the cross slide 5 to adjust the position of the ultrasonic transceiver probe 3. The topless glass cover 9 is used to enclose the working space, and the heater 10 is placed on the inner edge of the topless glass cover, as far away from the various devices as possible, so that the surface temperature distribution of the power battery 2 to be tested is as uniform as possible. A heater 10 is also provided on the inner side of the topless glass cover 9, using a traditional external heat source heating method to avoid adding interference to the ultrasonic detection. The power of the heater 10 is adjustable and is placed in the topless glass cover 9, as far away from the various devices as possible. At the same time, temperature measurement is performed with the help of the temperature sensor. The power-adjustable heater 10 and the topless glass cover 9 form a constant temperature module, which can control the temperature variable T to remain at a constant value to avoid the influence of temperature fluctuations on the ultrasonic detection results.

[0023] See Figure 1-3 , a method for detecting the capacity of power battery 2 based on ultrasonic detection,

[0024] Divide the main surface of the power battery 2 into n small blocks evenly according to the area, and mark the midpoint of these n small blocks as the detection point 11;

[0025] Then fix the power battery 2 in the center of the workbench 1 with a flexible battery clamp; install the ultrasonic transceiver probe 3 at the bottom end of the cross slide 5, adjust the position of the cross slide 5 so that the ultrasonic transceiver probe 3 contacts the detection point 11 of the power battery 2, adjust the tightness of the tightening bolts so that the ultrasonic transceiver probe 3 is close to the surface of the power battery 2 without affecting the movement of the probe; connect the power battery 2 to the charging and discharging instrument 7, and connect the ultrasonic transceiver probe 3 to the display screen 8; surround the working space with a roofless glass cover 9, start the heater 10, and adjust the power of the heater 10 until the temperature sensor reaches the required temperature T and remains stable.

[0026] Start the charge and discharge instrument 7 and record the battery power Y i , start the ultrasonic transceiver probe 3, operate the slide controller 6 of the cross slide 5 to make the ultrasonic transceiver probe 3 traverse the n detection points 11 of the power battery 2, adjust the tightness of the tightening bolts to keep the pressure of the ultrasonic transceiver probe 3 at the n detection points consistent, and record the image of the ultrasonic imaging display screen 8 at each detection point 11;

[0027] Extract n ultrasonic sound time of flight (TOF) and n ultrasonic sound amplitudes A from n groups of images respectively, and remove the maximum value of TOF. i max 、A i max and minimum TOF i min 、A i min , for the remaining n-2 sound time TOFi j Harmonic amplitude A i j The data is averaged to obtain the average ultrasonic sound time Harmonic Amplitude

[0028] This series of temperature T under Y i and and The corresponding data between them is based on the remaining power Y of power battery 2 i The mapping relationship table between the remaining power of the power battery 2 and the average sound duration and sound amplitude of the ultrasonic detection signal at temperature T can be obtained by sorting from low to high.

[0029] At the i-th charge and discharge, the remaining power of power battery 2 is Y i In this case, the ultrasonic transceiver probe 3 is used to obtain the ultrasonic signal waveforms of n detection points 11, and n ultrasonic sound times (TOFs) and n ultrasonic sound amplitudes (A) are extracted from these n groups of images, which are recorded as TOFs. i j and A i j , j=1,2,…,n, calculate the average sound time Harmonic Amplitude

[0030]

[0031]

[0032] Continue to charge and discharge the power battery 2, repeat the test steps, and obtain a series of Y i and and The corresponding data between them eventually form a mapping relationship table between the remaining power of the power battery 2 at temperature T and the average sound time and sound amplitude of the ultrasonic detection signal.

[0033] This application is used to obtain the mapping relationship between the remaining power of the power battery 2 and its internal ultrasonic signal characteristics. After knowing the mapping relationship between the remaining power of the power battery 2 and its internal ultrasonic signal characteristics, the remaining power of the same model of power battery can be detected by ultrasonic detection, which can realize real-time detection of the remaining power of the power battery; the detection speed is fast, and the detection speed can be significantly improved for a large number of power battery power detections.

[0034] Ultrasonic detection of the remaining power of a power battery is much faster than using a conventional power battery capacity tester, and can significantly improve detection efficiency when used for centralized detection of a large number of power batteries; ultrasonic detection of the remaining power of a power battery can achieve real-time detection by detecting the main surface of the battery. Compared with conventional power battery capacity testers that require connection to corresponding interfaces, this application has a large detection position range and is convenient for use in automated detection processes; for the recycling and processing of waste power batteries, the use of ultrasonic detection can solve problems that cannot be detected, such as power battery swelling and battery interface damage.

[0035] The position of the ultrasonic transceiver probe 3 can be adjusted by controlling the cross slide 5, and finally a mapping relationship table between the remaining power of the power battery 2 and the average sound time and sound amplitude of the ultrasonic detection signal at temperature T is formed. The detection is accurate and fast, and the temperature and pressure are kept constant during the detection process, thereby reducing errors.

[0036] It should be noted that, in this article, the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0037] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A power battery capacity detection device based on ultrasonic detection, comprising a workbench, characterized in that: The workbench is provided with a bracket, a cross slide is installed on the bracket, the bottom end of the cross slide is connected to an ultrasonic transceiver probe by tightening bolts, the ultrasonic transceiver probe is integrated with a pressure sensor and a temperature sensor, and its detection surface is provided with ultrasonic transceiver contacts, temperature sensor contacts and pressure sensor contacts; the ultrasonic transceiver probe is connected to the display screen, a power battery is installed on the workbench, and the power battery is connected to a power battery charging and discharging instrument; a topless glass cover is provided on the workbench, the bracket and the power battery are both located on the inner side of the topless glass cover, and a heater is also provided on the inner side of the topless glass cover; The method of the power battery capacity detection device based on ultrasonic detection includes: Divide the main surface of the power battery into n small blocks evenly according to the area, and mark the midpoint of these n small blocks as the detection point; Start the power battery charge and discharge instrument and record the battery power , start the ultrasonic transceiver probe, operate the controller of the cross slide to make the ultrasonic transceiver probe traverse n detection points of the power battery, adjust the tightness of the tightening bolts to keep the pressure of the ultrasonic transceiver probe consistent at n detection points, and record the image on the ultrasonic imaging display screen at each detection point; When n ultrasonic sounds are extracted from n sets of images, and n ultrasonic amplitudes , remove the maximum value 、 and minimum value 、 , for the remaining n-2 sounds Harmonic Amplitude The data is averaged to obtain the average ultrasonic sound time Harmonic Amplitude ; Continue to charge and discharge the power battery, repeat the test steps, and obtain a series of and and The corresponding data between them eventually forms a mapping relationship table between the remaining power of the power battery at temperature T and the average sound time and sound amplitude of the ultrasonic detection signal.

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