A device for measuring the capacity retention of lithium manganese oxide batteries

Abstract

This utility model provides a capacity retention rate measuring device for lithium manganese oxide batteries, belonging to the field of lithium manganese oxide battery measuring technology. It includes: a processing table; two electric conveyor belts are fixedly connected to the upper surface of the processing table; a detection mechanism is fixedly connected to the surface of the processing table and inside the two electric conveyor belts; a positioning mechanism is fixedly connected to the front of the detection mechanism; a transport mechanism is fixedly connected to the front of the positioning mechanism; and two horizontally extending first guide rails are fixedly connected to the upper surface of the processing table. A detection frame is slidably connected to the surface of the first guide rails. This solution improves the battery terminal positioning accuracy through the adaptive detection probe of the detection mechanism and the coordinated clamping of the positioning mechanism. Combined with real-time data analysis from an electrochemical impedance spectroscopy (EIS) tester, the capacity retention rate calculation result is directly fed back to the control system, shortening the single-cell testing time. The dynamic adjustment design of the detection probe spacing reduces the procurement cost of dedicated fixtures.

Description

Technical Field

[0001] This utility model belongs to the field of lithium manganese oxide battery testing technology, specifically relating to a device for measuring the capacity retention rate of lithium manganese oxide batteries. Background Technology

[0002] Lithium manganese oxide batteries refer to batteries with a voltage of 3.7V and an internal resistance of no more than 200mΩ. Lithium manganese oxide batteries are a low-cost, safe, and low-temperature-performance cathode material. However, the material itself is not very stable and is prone to decomposition to produce gas. Therefore, it is often used in combination with other materials to reduce the cost of the cell. However, its cycle life decays quickly, it is prone to swelling, has poor high-temperature performance, and a relatively short lifespan. It is mainly used in medium and large-sized cells. In terms of power batteries, its nominal voltage is 3.7V.

[0003] Traditional testing relies on manual probe placement, which results in relatively large positioning errors and distortion of impedance spectrum data. Traditional measuring devices also have poor equipment compatibility; fixed-spacing probes cannot be adapted to batteries of different sizes, requiring frequent fixture changes. Furthermore, it is inconvenient to adjust the battery position before measurement, which can easily increase fluctuations in internal resistance testing. To address these issues, we propose a lithium manganese oxide battery capacity retention rate measuring device. Utility Model Content

[0004] The purpose of this invention is to provide a device for measuring the capacity retention rate of lithium manganese oxide batteries, which aims to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A lithium manganese oxide battery capacity retention rate measuring device includes: a processing table, two electric conveyor belts fixedly connected to the upper surface of the processing table, a detection mechanism fixedly connected to the surface of the processing table and inside the two electric conveyor belts, a positioning mechanism fixedly connected to the front of the detection mechanism, and a conveying mechanism fixedly connected to the front of the positioning mechanism. The detection mechanism is fixedly connected to two horizontally extending first guide rails on the upper surface of the processing table. A detection frame is slidably connected to the surface of the first guide rails. A moving plate is slidably connected to the surface of the detection frame. An electrochemical impedance spectroscopy (EIS) instrument is fixedly connected to the front of the detection frame. A connecting seat is fixedly connected to the surface of the moving plate. Two second guide rails extend horizontally from the bottom of the connecting seat. Two moving seats are slidably connected to the surface of the second guide rails. A detection probe is fixedly connected to the surface of the moving seat, and the detection probe is electrically connected to the EIS instrument.

[0006] As a preferred embodiment of this utility model, a first electric cylinder is installed on the back of the testing frame, and the piston rod of the first electric cylinder is fixedly connected to the moving plate.

[0007] In a preferred embodiment of this utility model, a transmission gear is rotatably connected to the bottom of the connecting seat, and transmission gear plates adapted to the transmission gear are fixedly connected to the surfaces of the two movable seats. A first servo motor is mounted on the surface of the connecting seat, and the output shaft of the first servo motor is fixedly connected to the transmission gear.

[0008] In a preferred embodiment of this utility model, the positioning mechanism includes a positioning frame fixedly connected to the surface of the processing table. Two positioning guide plates are fixedly connected to the surface of the positioning frame. Two positioning slide plates are slidably connected to the surface of the positioning frame and inside the two positioning guide plates. Two second electric cylinders are fixedly connected to the lower surface of the positioning frame, and the piston rods of the two second electric cylinders are respectively fixedly connected to the two positioning slide plates.

[0009] As a preferred embodiment of this utility model, the conveying mechanism includes a conveying frame fixedly connected to the upper surface of the processing table. The surface of the conveying frame is provided with a horizontally extending third guide rail. An adjusting seat is slidably connected to the surface of the third guide rail. A third electric cylinder for longitudinal adjustment is installed on the surface of the adjusting seat. A rotating frame is fixedly connected to the surface of the piston rod of the third electric cylinder. Two vacuum suction cups are installed at the bottom of the rotating frame.

[0010] In a preferred embodiment of this utility model, two pulleys are rotatably connected to the front surface of the transport frame, and the two pulleys are rotatably connected through a transmission belt. The adjusting seat is fixedly connected to the surface of the transmission belt. A second servo motor is fixedly connected to the back of the transport frame, and the output shaft of the second servo motor is fixedly connected to a pulley.

[0011] Compared with the prior art, the beneficial effects of this utility model are: This solution improves the positioning accuracy of battery terminals by using the adaptive detection probe of the testing mechanism and the coordinated clamping of the positioning mechanism. Combined with the real-time data analysis of the electrochemical impedance spectroscopy tester, the capacity retention rate calculation results are directly fed back to the control system, shortening the single-cell testing time. The dynamic adjustment design of the detection probe spacing reduces the procurement cost of special fixtures. Attached Figure Description

[0012] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0013] In the attached diagram: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the detection mechanism in the structure of this utility model; Figure 3This is a partial structural diagram of the detection mechanism in the present invention; Figure 4 This is a schematic diagram of the positioning mechanism in the structure of this utility model; Figure 5 This is a schematic diagram of the conveying mechanism in the structure of this utility model.

[0014] In the diagram: 1. Processing table; 2. Electric conveyor belt; 3. Detection mechanism; 301. First guide rail; 302. Detection frame; 303. Moving plate; 304. First electric cylinder; 305. Electrochemical impedance spectroscopy instrument; 306. Connecting seat; 307. First servo motor; 308. Second guide rail; 309. Moving seat; 310. Detection probe; 311. Transmission gear plate; 312. Transmission gear; 4. Positioning mechanism; 401. Positioning frame; 402. Positioning guide plate; 403. Positioning slide plate; 404. Second electric cylinder; 5. Transport mechanism; 501. Transport frame; 502. Third guide rail; 503. Adjusting seat; 504. Third electric cylinder; 505. Rotating frame; 506. Vacuum suction cup; 507. Pulley; 508. Transmission belt; 510. Second servo motor. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0016] Please see Figure 1-5 The technical solution provided in this embodiment is as follows: A device for measuring the capacity retention rate of a lithium manganese oxide battery includes: a processing table 1; two electric conveyor belts 2 are fixedly connected to the upper surface of the processing table 1; a detection mechanism 3 is fixedly connected to the surface of the processing table 1 and inside the two electric conveyor belts 2; a positioning mechanism 4 is fixedly connected to the front of the detection mechanism 3; a conveying mechanism 5 is fixedly connected to the front of the positioning mechanism 4; two horizontally extending first guide rails 301 are fixedly connected to the upper surface of the processing table 1; a detection frame 302 is slidably connected to the surface of the first guide rails 301; a moving plate 303 is slidably connected to the surface of the detection frame 302; an electrochemical impedance spectroscopy instrument 305 is fixedly connected to the front of the detection frame 302; and the moving plate 303... A connecting seat 306 is fixedly connected to the surface. Two second guide rails 308 extend horizontally from the bottom of the connecting seat 306. Two movable seats 309 are slidably connected to the surface of the second guide rails 308. A detection probe 310 is fixedly connected to the surface of the movable seat 309, and the detection probe 310 is electrically connected to the electrochemical impedance spectroscopy instrument 305. Through the adaptive detection probe 310 of the detection mechanism 3 and the coordinated clamping of the positioning mechanism 4, the positioning accuracy of the battery terminal is improved. Combined with the real-time data analysis of the electrochemical impedance spectroscopy instrument 305, the capacity retention rate calculation result is directly fed back to the control system, shortening the single-cell detection time. The dynamic adjustment design of the spacing of the detection probe 310 reduces the procurement cost of special fixtures.

[0017] Specifically, a first electric cylinder 304 is installed on the back of the testing frame 302, and the piston rod of the first electric cylinder 304 is fixedly connected to the moving plate 303.

[0018] In a specific embodiment of this utility model, the piston rod of the first electric cylinder 304 directly drives the moving plate 303 to move longitudinally, thereby causing the detection probe 310 to rise and fall to the battery terminal position.

[0019] Specifically, a transmission gear 312 is rotatably connected to the bottom of the connecting seat 306, and transmission gear plates 311 adapted to the transmission gear 312 are fixedly connected to the surfaces of the two movable seats 309. A first servo motor 307 is mounted on the surface of the connecting seat 306, and the output shaft of the first servo motor 307 is fixedly connected to the transmission gear 312.

[0020] In a specific embodiment of this utility model, the first servo motor 307 drives the transmission gear 312 to rotate, which in turn drives the transmission gear plates 311 on both sides to move in opposite directions, so that the moving seat 309 can extend and retract synchronously along the second guide rail 308, ensuring that the detection probe 310 is completely in contact with the pole post. The dual detection probes 310 are designed to conduct electricity independently to avoid signal crosstalk.

[0021] Specifically, the positioning mechanism 4 includes a positioning frame 401 fixedly connected to the surface of the processing table 1. Two positioning guide plates 402 are fixedly connected to the surface of the positioning frame 401. Two positioning slide plates 403 are slidably connected to the surface of the positioning frame 401 and located inside the two positioning guide plates 402. Two second electric cylinders 404 are fixedly connected to the lower surface of the positioning frame 401, and the piston rods of the two second electric cylinders 404 are fixedly connected to the two positioning slide plates 403 respectively.

[0022] In a specific embodiment of this utility model, the second electric cylinder 404 pushes the positioning slide plate 403 to slide along the positioning guide plate 402, applying clamping force from both sides of the battery to fix its position. The clamping force is adjustable to eliminate battery displacement caused by vibration. The positioning guide plate 402 is designed to limit the position and prevent overpressure damage to the battery casing.

[0023] Specifically, the conveying mechanism 5 includes a conveying frame 501 fixedly connected to the upper surface of the processing table 1. The surface of the conveying frame 501 is provided with a horizontally extending third guide rail 502. An adjusting seat 503 is slidably connected to the surface of the third guide rail 502. A third electric cylinder 504 for longitudinal adjustment is installed on the surface of the adjusting seat 503. A rotating frame 505 is fixedly connected to the surface of the piston rod of the third electric cylinder 504. Two vacuum suction cups 506 are installed at the bottom of the rotating frame 505.

[0024] In a specific embodiment of this utility model, the third electric cylinder 504 drives the rotating frame 505 to rise and fall, and the vacuum suction cup 506 adsorbs the battery; the adjusting seat 503 moves horizontally along the third guide rail 502 to realize the transfer of the battery station, and the negative pressure value of the suction cup is adjustable to adapt to different surface materials.

[0025] Specifically, two pulleys 507 are rotatably connected to the front surface of the transport frame 501, and the two pulleys 507 are rotatably connected through a transmission belt 508. The adjusting seat 503 is fixedly connected to the surface of the transmission belt 508. A second servo motor 510 is fixedly connected to the back of the transport frame 501, and the output shaft of the second servo motor 510 is fixedly connected to one of the pulleys 507.

[0026] In a specific embodiment of this utility model, the second servo motor 510 drives the pulley 507 to rotate, and the transmission belt 508 drives the adjusting seat 503 to move horizontally.

[0027] Working principle: The electric conveyor belt 2 feeds the battery into the processing table 1. The second electric cylinder 404 of the positioning mechanism 4 drives the positioning slide plate 403 to clamp the battery and eliminate positional deviation. The first electric cylinder 304 of the detection mechanism 3 lowers the moving plate 303. The first servo motor 307 adjusts the distance between the detection probes 310 to the distance between the battery terminals through the transmission gear 312. The electrochemical impedance spectroscopy tester 305 applies a 10mA AC excitation signal to the detection probes 310, collects the voltage response and calculates the impedance spectrum characteristics. Based on the mapping relationship between the impedance characteristics and the capacity retention rate, the actual capacity retention rate is calculated in combination with the data of the charging and discharging equipment. If the battery capacity retention rate is detected, the system triggers the second servo motor 510 of the handling mechanism 5 to drive the pulley 507, which moves the adjusting seat 503 above the battery. The third electric cylinder 504 lowers the vacuum suction cup 506 to adsorb the battery and transfer it.

[0028] Finally, it should be noted that the above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for measuring the capacity retention rate of a lithium manganese oxide battery, characterized in that, include: A processing table (1) has two electric conveyor belts (2) fixedly connected to its upper surface. A detection mechanism (3) is fixedly connected to the surface of the processing table (1) and inside the two electric conveyor belts (2). A positioning mechanism (4) is fixedly connected to the front of the detection mechanism (3). A transport mechanism (5) is fixedly connected to the front of the positioning mechanism (4). The detection mechanism (3) is fixedly connected to two horizontally extending first guide rails (301) on the upper surface of the processing table (1). A detection frame (302) is slidably connected to the surface of the first guide rails (301). A moving plate (303) is slidably connected to the surface of the detection frame (302) longitudinally. An electrochemical impedance spectroscopy instrument (305) is fixedly connected to the front of the detection frame (302). A connecting seat (306) is fixedly connected to the surface of the moving plate (303). Two second guide rails (308) extend horizontally from the bottom of the connecting seat (306). Two moving seats (309) are slidably connected to the surface of the second guide rails (308). A detection probe (310) is fixedly connected to the surface of the moving seat (309), and the detection probe (310) is electrically connected to the electrochemical impedance spectroscopy instrument (305).

2. The lithium manganese oxide battery capacity retention measuring device according to claim 1, characterized in that, The back of the testing frame (302) is equipped with a first electric cylinder (304), and the piston rod of the first electric cylinder (304) is fixedly connected to the moving plate (303).

3. The lithium manganese oxide battery capacity retention rate measuring device according to claim 1, characterized in that, The bottom of the connecting seat (306) is rotatably connected to a transmission gear (312), and the surfaces of the two movable seats (309) are fixedly connected to transmission gear plates (311) adapted to the transmission gear (312). The surface of the connecting seat (306) is equipped with a first servo motor (307), and the output shaft of the first servo motor (307) is fixedly connected to the transmission gear (312).

4. The lithium manganese oxide battery capacity retention measuring device according to claim 1, characterized in that, The positioning mechanism (4) includes a positioning frame (401) fixedly connected to the surface of the processing table (1). Two positioning guide plates (402) are fixedly connected to the surface of the positioning frame (401). Two positioning slide plates (403) are slidably connected to the surface of the positioning frame (401) and inside the two positioning guide plates (402). Two second electric cylinders (404) are fixedly connected to the lower surface of the positioning frame (401), and the piston rods of the two second electric cylinders (404) are fixedly connected to the two positioning slide plates (403) respectively.

5. The lithium manganese oxide battery capacity retention measuring device according to claim 1, characterized in that, The transport mechanism (5) includes a transport frame (501) fixedly connected to the upper surface of the processing table (1). The surface of the transport frame (501) is provided with a horizontally extending third guide rail (502). An adjustment seat (503) is slidably connected to the surface of the third guide rail (502). A third electric cylinder (504) for longitudinal adjustment is installed on the surface of the adjustment seat (503). A rotating frame (505) is fixedly connected to the surface of the piston rod of the third electric cylinder (504). Two vacuum suction cups (506) are installed at the bottom of the rotating frame (505).

6. The lithium manganese oxide battery capacity retention measuring device according to claim 5, characterized in that, Two pulleys (507) are rotatably connected to the front surface of the transport frame (501), and the two pulleys (507) are rotatably connected through a transmission belt (508). The adjusting seat (503) is fixedly connected to the surface of the transmission belt (508). A second servo motor (510) is fixedly connected to the back of the transport frame (501), and the output shaft of the second servo motor (510) is fixedly connected to one of the pulleys (507).

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