Battery cell voltage and internal resistance automatic testing machine based on stacked trays

Abstract

The invention discloses an automatic battery cell voltage and internal resistance testing machine based on stacked trays. The automatic battery cell voltage and internal resistance testing machine comprises an automatic stacked tray feeding and discharging mechanism, a feeding variable-pitch carrying mechanical arm, a battery cell positioning mechanism, a rotating disc mechanism, a code scanning and temperature measuring mechanism, an OCV detection mechanism, a discharging variable-pitch mechanical arm and a battery cell NG discharging mechanism. According to the device, full-process automatic operation of stacking tray conveying, variable-pitch carrying, synchronous positioning, rotating disc circulation, code scanning temperature measurement, parallel OCV detection and sorting discharging of the battery cells is achieved, and by optimizing mechanism layout and multi-station cooperative control, the production efficiency, the detection precision and the equipment flexibility are remarkably improved; and the requirements of intelligent detection of high-precision, high-beat and multi-specification battery cells in the fields of new energy automobiles, energy storage systems and the like are met.

Description

Technical Field

[0001] The present application relates to the field of battery cell testing equipment, and in particular to an automatic battery cell voltage and internal resistance testing machine based on stacked material trays. Background Art

[0002] With the widespread application of lithium-ion batteries in new energy vehicles, energy storage systems and other fields, the quality inspection process in the battery production process has increasingly higher requirements for automation, efficiency and test accuracy. As core indicators of battery performance, the integration and intelligence level of the testing equipment for open circuit voltage (OCV) and internal resistance directly affect production efficiency and product consistency. Traditional testing equipment mostly uses manual loading and unloading or semi-automatic step-by-step testing mode, which has problems such as low efficiency, large fluctuations in test data, and poor process connection, making it difficult to meet the needs of large-scale intelligent manufacturing.

[0003] In the prior art, patent CN107064810B discloses a battery cell OCV tester, which realizes multi-station flow through a turntable mechanism and integrates scanning, testing and unloading functions. However, its unloading and unloading process relies on a single manipulator to carry each cell one by one, and the number of cells processed at a time is limited. It is not equipped with a variable pitch mechanism, resulting in poor adaptability of cells of different specifications. Patents CN110927603B and CN110794320A further optimize the test process, introduce visual positioning, tab shaping and temperature detection modules, and use dual-cell parallel processing and adjustable probe structure to improve compatibility. However, this type of equipment still has the following technical bottlenecks: (1) The coordination efficiency between the loading and unloading mechanism and the test station is insufficient, and the switching of the material tray requires frequent shutdown, which affects the beat; (2) The synchronous positioning accuracy of multiple battery cells is insufficient, which can easily lead to a decrease in test stability due to poor contact of the tabs; (3) The scanning, temperature measurement and electrical performance testing links are scattered, and there is idle waiting time between processes; (4) The sorting of NG battery cells relies on independent manipulators or manual intervention, and the sorting path is complex and easy to cause mixing. In addition, the variable distance mechanism of existing equipment mostly adopts fixed stroke adjustment, which is difficult to adapt to the rapid switching requirements of mixed-line production of multi-specification battery cells, resulting in insufficient equipment flexibility. Summary of the invention

[0004] The purpose of this application is to provide an automatic cell voltage and internal resistance testing machine based on stacked material trays. By optimizing the mechanism layout and multi-station collaborative control, the full-process integrated operation of the cell from precise positioning, synchronous code scanning and temperature measurement to efficient OCV detection can be realized, while improving the parallel processing capability of multiple cells and the real-time sorting efficiency of defective products, so as to meet the intelligent manufacturing needs of high-precision, high-beat, and multi-specification compatible power batteries.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] An automatic test machine for battery cell voltage internal resistance based on stacking trays, comprising an automatic loading and unloading mechanism for stacking trays, a variable-pitch loading and transporting manipulator, a battery cell positioning mechanism, a turntable mechanism, a code scanning and temperature measuring mechanism, an OCV detection mechanism, a variable-pitch unloading manipulator and a battery cell NG unloading mechanism; the automatic loading and unloading mechanism for stacking trays is used to transport the stacked trays to the battery cell loading position and to stack and unload the battery cells that have tested OK; the variable-pitch loading and transporting manipulator is arranged between the automatic loading and unloading mechanism for stacking trays and the battery cell positioning mechanism, and is used to obtain at least two battery cells in the tray and transfer them to the battery cell positioning mechanism with variable distance; the battery cell positioning mechanism is used to synchronously position multiple battery cells, and after positioning, the variable-pitch loading and transporting manipulator transfers the battery cells to the turntable mechanism; the turntable The mechanism is arranged on one side of the battery cell positioning mechanism, and transfers the battery cell to the code scanning and temperature measuring mechanism; the code scanning and temperature measuring mechanism is arranged on one side of the turntable mechanism, and is used to simultaneously obtain the temperature of the battery cell and the information on the battery cell QR code or barcode, and then the turntable mechanism continues to transfer the battery cell to the OCV detection mechanism; the OCV detection mechanism is arranged on one side of the turntable mechanism, and is used to simultaneously perform OCV detection on multiple battery cells, and then the turntable mechanism continues to transfer the battery cell to the variable-pitch unloading manipulator; the variable-pitch unloading manipulator is used to transfer at least two OK battery cells on the turntable mechanism to the empty trays of the stacking tray automatic loading and unloading mechanism with variable pitch, and transfer the NG battery cells to the battery cell NG unloading mechanism; the battery cell NG unloading mechanism unloads the NG battery cells.

[0007] In one of the embodiments, the automatic loading and unloading mechanism for stacked trays includes a tray feeding positioning device, a tray lifting device, a tray positioning and separating device, an empty material CCD detection device, an empty tray transfer robot and a tray discharge positioning device. The tray feeding positioning device is used to perform initial positioning and fine positioning on the stacked trays respectively. The tray lifting device is arranged in the tray feeding positioning device for lifting the stacked trays. The tray positioning and separating devices are respectively arranged on both sides of the tray feeding positioning device for positioning the single tray on the top layer and separating the tray on the next layer when taking away the tray on the top layer. The empty material CCD detection device is arranged above the tray feeding positioning device for detecting whether the tray on the top layer has a battery cell. The empty tray transfer robot is arranged between the tray feeding positioning device and the tray discharge positioning device. The empty tray transfer robot is used to transfer the empty tray at the tray feeding positioning device to the tray discharge positioning device. The tray discharge positioning device is used to discharge the stacked trays.

[0008] In one of the embodiments, the material tray feed positioning device includes a feed pull belt, a stacked material tray initial positioning component, and a stacked material tray fine positioning device. The feed pull belt is used to transport the stacked material trays. The stacked material tray initial positioning component is arranged on both sides of the feed pull belt for preliminary positioning of the lower side of the stacked material trays. The stacked material tray fine positioning device is arranged on both sides of the feed pull belt for fine positioning of the stacked material trays as a whole.

[0009] In one of the embodiments, the tray feeding positioning device further includes a material blocking assembly, which is located above the stacked tray initial positioning assembly and is used to block subsequent stacked trays from entering the fine positioning area.

[0010] In one of the embodiments, the stacked material tray initial positioning assembly includes a first initial positioning plate, a second initial positioning plate and an initial positioning drive device, the first initial positioning plate and the second initial positioning plate are respectively arranged on both sides of the feed pull belt, and the initial positioning drive device is used to drive the first initial positioning plate and the second initial positioning plate to move closer to or away from each other.

[0011] In one of the embodiments, the tray positioning and separation device comprises a positioning and separation block and a positioning and separation drive device, the separation block is mounted on the positioning and separation drive device, and the positioning and separation drive device is used to drive the separation block to approach or away from the tray.

[0012] In one embodiment, the battery cell positioning mechanism includes an X-axis positioning device, a Y-axis positioning device and a positioning platform, the X-axis positioning device and the Y-axis positioning device are both installed on the positioning platform, the X-axis positioning device is used to position the battery cell in the X-axis direction, and the Y-axis positioning device is used to position the battery cell in the Y-axis direction.

[0013] In one embodiment, the code scanning and temperature measurement mechanism includes a code scanner, a thermometer, a first transverse movement seat and a first transverse movement drive module. The code scanner and the thermometer are respectively installed on the first transverse movement seat, and the first transverse movement seat is installed on the first transverse movement drive module. The first transverse movement drive module is used to drive the code scanner and the thermometer to approach or move away from the battery cell.

[0014] In one embodiment, the OCV detection mechanism includes a mounting frame, a Z transverse drive module, a probe mounting seat, a positive probe assembly and a negative probe assembly, wherein the positive probe assembly and the negative probe assembly are both mounted on the probe mounting seat, the probe mounting seat is mounted on the Z transverse drive module, the Z transverse drive module is mounted on the mounting frame, and the Z transverse drive module is used to drive the probe mounting seat to drive the positive probe assembly and the negative probe assembly to perform lifting movements.

[0015] In one embodiment, the positive probe assembly includes a positive mounting base plate, a positive mounting panel, a first positive probe and a second positive probe, wherein the first positive probe and the second positive probe are arranged between the positive mounting base plate and the positive mounting panel, and the positive mounting panel fixes the first positive probe and the second positive probe to the positive mounting base plate. The negative probe assembly includes a negative mounting base plate, a negative mounting panel, a first negative probe and a second negative probe, wherein the first negative probe and the second negative probe are arranged between the negative mounting base plate and the negative mounting panel, and the negative mounting panel fixes the first negative probe and the second negative probe to the negative mounting base plate.

[0016] The beneficial effects of this application are:

[0017] This application realizes the batch removal and precise delivery of battery cells from the tray by adopting the stacked tray automatic loading and unloading mechanism and the loading variable-pitch handling manipulator, avoiding the low efficiency problem caused by the traditional single-piece handling one by one, thereby greatly improving the overall production rhythm. The battery cell positioning mechanism can accurately position multiple battery cells simultaneously to ensure the accurate position of the battery cells between each workstation, reduce the fluctuation of test data caused by positioning deviation, and improve the detection accuracy and data consistency. The reasonable layout of the turntable mechanism and the code scanning and temperature measurement mechanism enables the battery cells to be scanned and the temperature detected simultaneously after they are transported to the right place, saving the process switching time and significantly improving the detection efficiency. The OCV detection mechanism performs parallel detection on multiple battery cells, which improves the test speed. The unloading variable-pitch manipulator automatically adjusts the grasping spacing to accurately transfer the battery cells detected as OK to the empty tray, and at the same time realizes the diversion processing of NG battery cells, effectively reducing the risk of mixing or misjudgment in the subsequent sorting process. The overall system adopts a full-process integrated design, which realizes the seamless connection of various processes such as loading, testing, and sorting, greatly shortens the equipment downtime and tray switching time, and meets the needs of large-scale intelligent manufacturing for high-beat production. The dynamic variable distance handling technology makes the equipment highly flexible and can adapt to the mixed production of multi-specification battery cells, reduce the manpower and time costs required for model change and adjustment, and improve the comprehensive utilization rate and economic benefits of the production line.

[0018] To summarize, the stacked material tray-based battery cell voltage and internal resistance automatic testing machine provided in this application realizes the full-process automation of battery cell positioning, synchronous code scanning and temperature measurement to efficient OCV detection by optimizing the mechanism layout and multi-station collaborative control, significantly improving production efficiency, detection accuracy and equipment flexibility, and effectively meeting the intelligent manufacturing needs of new energy vehicles, energy storage systems and other fields for battery cells with high precision, high cycle and multi-specification compatibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a battery cell voltage and internal resistance automatic testing machine based on stacked trays provided in one embodiment of the present application;

[0020] Figure 2 A top view of an automatic loading and unloading mechanism for stacked trays provided in one embodiment of the present application;

[0021] Figure 3 A three-dimensional diagram of an automatic loading and unloading mechanism for stacking trays provided in one embodiment of the present application;

[0022] Figure 4 a is a schematic diagram of the structure of the stacked trays before positioning and separation provided in an embodiment of the present application, Figure 4 b is a schematic diagram of the structure before the stacked trays are positioned and separated according to an embodiment of the present application; Figure 4 c is a schematic diagram of the structure of the stacked trays after being positioned and separated according to an embodiment of the present application;

[0023] Figure 5 A schematic diagram of the structure of a battery cell positioning mechanism provided in one embodiment of the present application;

[0024] Figure 6 A schematic diagram of the structure of a turntable mechanism provided in one embodiment of the present application;

[0025] Figure 7 A schematic diagram of the structure of a code scanning temperature measurement mechanism provided in one embodiment of the present application;

[0026] Figure 8 A schematic diagram of the structure of an OCV detection mechanism provided in one embodiment of the present application;

[0027] Fig. 9 A schematic diagram of the structure of a battery cell NG unloading mechanism provided in one embodiment of the present application;

[0028] Description of reference numerals:

[0029] 1. Automatic loading and unloading mechanism for stacked trays; 2. Variable-pitch loading and handling manipulator; 3. Cell positioning mechanism; 4. Turntable mechanism; 5. Scanning code temperature measurement mechanism; 6. OCV detection mechanism; 7. Variable-pitch unloading manipulator; 8. Cell NG unloading mechanism; 9. Stacked trays; 11. Tray feeding and positioning device; 12. Tray lifting device; 13. Tray positioning and separation device; 14. Empty material CCD detection device; 15. Empty tray transfer manipulator; 16. Material tray discharging positioning device; 111. Material feeding belt; 112. Stacking material tray initial positioning assembly; 113. Stacking material tray fine positioning device; 114. Material blocking assembly; 1121. First initial positioning plate; 1122. Second initial positioning plate; 1123. Initial positioning drive device; 1141. Material blocking plate; 1142. Material blocking cylinder; 1123a. Motor; 1123b. Forward and reverse threaded screw rod; 1123c. Guide assembly;

[0030] 131, positioning and separation block; 132, positioning and separation drive device; 1311, positioning part; 1312, separation part; 31, X-axis positioning device; 32, Y-axis positioning device; 33, positioning platform; 311, X-axis positioning assembly; 312, X-axis positioning fixing rod; 3111, X-axis positioning push rod; 3112, buffer assembly; 3113, second transverse shift seat; 3114, second transverse shift drive module; 3112a, buffer spring; 3112b, buffer slide rail; 3112c, limit block; 321, Y-axis positioning push block; 41, battery cell fixing; 51, barcode scanner; 52, thermometer; 53, first transverse shift seat; 54, first transverse drive module; 61, mounting frame; 62, Z transverse drive module; 63, probe mounting seat; 64, positive probe assembly; 65, negative probe assembly; 66, needle tip; 641, positive mounting base plate; 642, positive mounting panel; 643, first positive probe; 644, second positive probe; 651, negative mounting base plate; 652, negative mounting panel; 653, first negative probe; 654, second negative probe; 631, guide groove; 632, guide convex strip; 81, NG unloading manipulator; 82, NG unloading transfer table; 83, first NG material frame; 84, second NG material frame; DETAILED DESCRIPTION

[0031] The terms used in the implementation method part of this application are only used to explain the specific embodiments of this application, and are not intended to limit this application. The implementation method of the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0032] The term "stacked trays 9" in the present application means that the cells are first placed on dedicated trays, and these trays themselves are arranged and stored in a stacked manner.

[0033] The term OCV test in this application is "open circuit voltage test", which refers to measuring the voltage of a battery cell without any load. This test can reflect the charging state and health of the battery cell and is an important indicator for evaluating the performance of the battery cell.

[0034] like Figure 1 As shown, a cell voltage internal resistance automatic test machine based on stacking trays includes a stacking tray automatic loading and unloading mechanism 1, a loading variable-distance handling manipulator 2, a cell positioning mechanism 3, a turntable mechanism 4, a code scanning temperature measurement mechanism 5, an OCV detection mechanism 6, a unloading variable-distance manipulator 7 and a cell NG unloading mechanism 8. The fully automated operation of the cell from loading, positioning, detection to intelligent sorting is realized, which significantly improves production efficiency and detection accuracy and enhances equipment flexibility.

[0035] Automatic loading and unloading mechanism 1 for stacked trays: This mechanism is responsible for the loading and unloading of cells in the entire test process. Before the test begins, it transports the tray with stacked cells to the cell loading position. After the test is completed, it re-stacks the cells that have tested OK into the empty tray for subsequent use or storage.

[0036] Loading variable distance handling manipulator 2: This manipulator is responsible for taking out at least 2 battery cells from the stacking tray automatic loading and unloading mechanism 1. In this embodiment, 2 battery cells are taken out, and the distance between the battery cells is adjusted according to the placement requirements of the battery cells in the battery cell positioning mechanism 3. This step ensures that the battery cells can be arranged according to the predetermined position and spacing when they are transferred to the battery cell positioning mechanism 3, so as to prepare for subsequent positioning and testing work. After the adjustment is completed, the manipulator accurately transfers the battery cells to the battery cell positioning mechanism 3.

[0037] Cell positioning mechanism 3: This mechanism is used to synchronously position multiple cells. In this embodiment, four cells are synchronously positioned. In this way, in the subsequent test process, the cells can remain stable and the test results will not be affected by position deviation. After positioning is completed, the loading variable distance handling manipulator 2 transfers the cells to the next test link.

[0038] Turntable mechanism 4: This mechanism is set between the battery cell positioning mechanism 3 and the subsequent testing mechanism, and is responsible for transferring the battery cell from one testing link to another. It uses rotational motion to achieve fast and accurate transfer of the battery cell. During the test process, the turntable mechanism 4 continuously transfers the battery cell from the battery cell positioning mechanism 3 to the code scanning temperature measurement mechanism 5, OCV detection mechanism 6 and other testing links, and then transfers the tested battery cell to the unloading variable pitch manipulator 7.

[0039] Scanning and temperature measurement mechanism 5: This mechanism is used to simultaneously obtain the temperature of the battery cell and the information on the battery cell QR code or barcode. It uses a scanning device and a temperature sensor to achieve fast and accurate scanning and temperature measurement of the battery cell. This information is of great significance for evaluating the performance and health of the battery cell. After scanning and temperature measurement are completed, the turntable mechanism 4 continues to transfer the battery cell to the next test stage.

[0040] OCV detection mechanism 6: This mechanism is used to perform OCV detection on multiple battery cells at the same time. In this embodiment, OCV detection is performed on four battery cells. It uses a voltage measuring device to measure the voltage value of the battery cell in the disconnected state. This voltage value reflects the energy storage capacity and performance status of the battery cell. After the OCV detection is completed, the turntable mechanism 4 continues to transfer the battery cell to the unloading variable-pitch manipulator 7.

[0041] Discharging variable-pitch manipulator 7: This manipulator is responsible for taking out the tested cells from the turntable mechanism 4 and classifying them according to the test results of the cells. For cells that are OK, the manipulator transfers them to the empty tray of the stacking tray automatic loading and unloading mechanism 1 by variable pitch; for cells that are NG (unqualified), the manipulator transfers them to the cell NG discharging mechanism 8 for discharging.

[0042] Cell NG unloading mechanism 8: This mechanism is responsible for unloading cells that are tested as NG. It uses mechanical or pneumatic devices to remove NG cells from the conveyor belt and place them in a designated location or container. In this way, the isolation and processing of NG cells is completed.

[0043] like Figure 2 As shown, in this embodiment, the stacked tray automatic loading and unloading mechanism 1 includes a tray feeding positioning device 11, a tray lifting device 12, a tray positioning and separating device 13, an empty material CCD detection device 14, an empty tray transfer robot 15 and a tray discharging positioning device 16. The tray feeding positioning device 11 is used to perform initial positioning and fine positioning on the stacked trays respectively. The tray lifting device 12 is arranged in the tray feeding positioning device 11 to lift the stacked trays. The tray positioning and separating devices 13 are respectively arranged on both sides of the tray feeding positioning device 11. The side is used to position the single tray on the top layer and separate it from the trays on the next layer when taking away the tray on the top layer. The empty material CCD detection device 14 is arranged above the tray feeding positioning device 11, and is used to detect whether the tray on the top layer has battery cells. The empty tray transfer robot 15 is arranged between the tray feeding positioning device 11 and the tray discharging positioning device 16. The empty tray transfer robot 15 is used to transfer the empty tray at the tray feeding positioning device 11 to the tray discharging positioning device 16. The tray discharging positioning device 16 is used to discharge the stacked trays.

[0044] In this embodiment, the automatic loading and unloading of the battery core tray is realized by integrating multiple functional modules such as the tray feeding positioning device 11, the tray lifting device 12, the tray positioning and separation device 13, the empty material CCD detection device 14, the empty tray transfer manipulator 15 and the tray discharging positioning device 16. This not only improves production efficiency, but also reduces the tediousness and errors of manual operation, making the entire test process smoother and more efficient.

[0045] Among them, the tray feeding positioning device 11 can perform initial positioning and fine positioning of the stacked trays to ensure the stability and accuracy of the trays during transportation. The tray positioning and separation device 13 can accurately position the single tray on the top layer, and separate it from the tray on the next layer when taking away the top tray, avoiding adhesion or misalignment between the trays and ensuring the smooth removal and testing of the battery cells. The empty material CCD detection device 14 can detect in real time whether there are battery cells in the top tray. This function is of great significance for timely discovery and processing of empty trays. Once an empty tray is detected, the empty tray transfer robot 15 will respond quickly and transfer the empty tray to the tray discharge positioning device 16 for timely replacement or processing. This intelligent detection and feedback mechanism improves the accuracy and reliability of the test.

[0046] like Figure 3 As shown, in this embodiment, the material tray feeding positioning device 11 includes a feeding pull belt 111, a stacked material tray initial positioning component 112, and a stacked material tray fine positioning device 113. The feeding pull belt 111 is used to convey the stacked material trays. The stacked material tray initial positioning component 112 is arranged on both sides of the feeding pull belt 111 for preliminary positioning of the lower side of the stacked material trays. The stacked material tray fine positioning device 113 is arranged on both sides of the feeding pull belt 111 for fine positioning of the stacked material trays as a whole.

[0047] The stacking tray initial positioning assembly 112 is provided on both sides of the feed belt 111 to perform initial positioning on the lower side of the stacking tray. This step is mainly to prevent the tray from shifting or tilting during the conveying process, and to provide a basis for subsequent fine positioning. The design of the initial positioning assembly is simple and effective, and can quickly and accurately complete the initial positioning task.

[0048] Based on the initial positioning, the fine positioning device further accurately positions the stacked tray as a whole. This step ensures the accuracy and stability of the tray in the positioning area, providing a strong guarantee for the subsequent cell removal and testing. The fine positioning device may use high-precision sensors and control systems to achieve precise adjustment and control of the tray position.

[0049] like Figure 3 As shown, in this embodiment, the tray feeding positioning device 11 also includes a material blocking assembly 114, which is located on the stacked tray initial positioning assembly 112 and is used to block subsequent stacked trays from entering the fine positioning area. The material blocking assembly 114 is provided with 2 groups, which include a material blocking plate 1141 and a material blocking cylinder 1142. After the stacked trays are transported to the initial positioning assembly for preliminary positioning, if there are trays in the fine positioning area that are undergoing precise positioning or testing, it is necessary to prevent subsequent stacked trays from entering the fine positioning area to cause interference. At this time, the material blocking cylinder 1142 drives the material blocking plate 1141 to extend and block the front side of the stacked trays, thereby effectively preventing them from entering the fine positioning area.

[0050] like Figure 3 As shown, in this embodiment, the stacking tray initial positioning assembly 112 includes a first initial positioning plate 1121, a second initial positioning plate 1122 and an initial positioning drive device 1123. The first initial positioning plate 1121 and the second initial positioning plate 1122 are respectively arranged on both sides of the feed pull belt 111, and the initial positioning drive device 1123 is used to drive the first initial positioning plate 1121 and the second initial positioning plate 1122 to move closer to or away from each other.

[0051] like Figure 2 and Figure 3 As shown, the initial positioning drive device 1123 includes a motor 1123a, a positive and negative threaded screw 1123b and a guide assembly 1123c. The first initial positioning plate 1121 and the second initial positioning plate 1122 are installed on the positive and negative threaded screw 1123b. When the motor 1123a is started, it drives the positive and negative threaded screw 1123b to rotate. The positive and negative threaded screw 1123b is a special screw with opposite rotation directions of the threads on both sides. When the positive and negative threaded screw 1123b rotates, the first initial positioning plate 1121 and the second initial positioning plate 1122 installed on the screw will be subjected to the thrust of the threads respectively. Since the rotation directions of the threads on both sides are opposite, the first initial positioning plate 1121 and the second initial positioning plate 1122 will be subjected to thrust in opposite directions, thereby achieving the action of approaching or moving away from each other. The setting of the guide assembly 1123c ensures the stability and accuracy of the first initial positioning plate 1121 and the second initial positioning plate 1122 during the movement process.

[0052] The specific working process is as follows: before the stacked material tray is conveyed to the initial positioning area, the first initial positioning plate 1121 and the second initial positioning plate 1122 maintain a certain distance so that the stacked material tray can pass smoothly. When the stacked material tray is conveyed to the initial positioning area, the initial positioning drive device 1123 starts to work. It drives the first initial positioning plate 1121 and the second initial positioning plate 1122 to approach each other and perform preliminary positioning on the lower side of the stacked material tray. This action ensures the stability and accuracy of the stacked material tray during the conveying process and provides a basis for subsequent fine positioning. After the initial positioning component completes its task, the stacked material tray will continue to be conveyed to the fine positioning area for further positioning and testing. At this time, the initial positioning drive device 1123 will drive the first initial positioning plate 1121 and the second initial positioning plate 1122 away from each other to facilitate the entry of the next stacked material tray. Through the synergistic effect of the first initial positioning plate 1121 and the second initial positioning plate 1122, the stacked material tray is effectively initially positioned during the conveying process. This ensures the stability and accuracy of the stacked material tray in the subsequent processing process and improves the accuracy and efficiency of battery cell removal and testing.

[0053] In view of the structural similarities between the stacked material tray precision positioning device 113 and the stacked material tray primary positioning device, the main difference is that the stacked material tray precision positioning device 113 performs more precise positioning on the entire stacked material tray, rather than just the bottom side of the tray. Therefore, its working principle and components (such as the motor 1123a, forward and reverse threaded screw 1123b, guide assembly 1123c and corresponding positioning plates) are logically similar, but differ in size, accuracy and possible application force to meet the needs of precise positioning of the entire stacked material tray.

[0054] In short, the stacking tray precision positioning device 113 adopts a similar structure and working principle to the primary positioning device, but is aimed at the entire stacking tray to achieve higher precision and stability positioning, ensuring the accuracy of cell removal and testing. Due to this similarity, the specific working principle and technical details of the stacking tray precision positioning device 113 will not be repeated here.

[0055] The tray lifting device 12 (not shown in the figure) includes a lifting rack, a lifting drive device and a lifting guide device. When the stacked trays are transported to the bottom of the lifting positioning device, the lifting drive device starts to work. The thrust it generates is transmitted to the stacked trays through the lifting rack, causing them to gradually rise. During the lifting process, the lifting guide device ensures the stability and accuracy of the lifting rack to prevent the trays from shifting or slipping. When the stacked trays rise to the specified position, the lifting drive device stops working. At this time, the stacked trays have been accurately positioned at the required height and position, which provides convenience for subsequent operations such as battery cell removal and testing.

[0056] like Figure 3 and Figure 4 As shown, in this embodiment, the tray positioning and separation device 13 includes a positioning and separation block 131 and a positioning and separation driving device 132. The separation block is installed on the positioning and separation driving device 132. The positioning and separation driving device 132 is used to drive the separation block to approach or away from the tray. The positioning and separation block 131 includes a positioning portion 1311 and a separation portion 1312. The positioning portion 1311 is used to position the tray, and the separation portion 1312 is used to separate the tray.

[0057] like Figure 5 As shown, in one embodiment, the battery cell positioning mechanism 3 includes an X-axis positioning device 31, a Y-axis positioning device 32 and a positioning platform 33. The X-axis positioning device 31 and the Y-axis positioning device 32 are both installed on the positioning platform 33. The X-axis positioning device 31 is used to position the battery cell in the X-axis direction, and the Y-axis positioning device 32 is used to position the battery cell in the Y-axis direction.

[0058] like Figure 5As shown, the X-axis positioning device 31 includes an X-axis positioning assembly 311 and an X-axis positioning fixing rod 312. The X-axis positioning assembly 311 includes an X-axis positioning push rod 3111, a buffer assembly 3112, a second transverse seat 3113, and a second transverse driving module 3114. The X-axis positioning fixing rod 312 is installed on the positioning platform 33. The X-axis positioning push rod 3111 is installed on the second transverse seat 3113 through the buffer assembly 3112. The second transverse driving module 3114 is used to drive the second transverse seat 3113 to drive the X-axis positioning push rod 3111 to push the side of the battery cell close to the X-axis positioning fixing rod 312, thereby completing the positioning of the battery cell in the X direction. The buffer assembly 3112 plays an important protective role in the process of the push rod, preventing the battery cell from being damaged due to excessive impact force.

[0059] like Figure 5 As shown, the buffer assembly 3112 includes a buffer spring 3112a, a buffer rail 3112b and a limit block 3112c, one end of the buffer spring 3112a rests on the slider of the buffer rail 3112b, and the other end rests on the limit block 3112c, and the X-axis positioning push rod 3111 is installed on the slider of the buffer rail 3112b.

[0060] like Figure 5 As shown, the Y-axis positioning device 32 includes a Y-axis positioning push block 321, a Y-axis pushing frame and a Y-axis pushing module. The Y-axis positioning push block 321 is installed on the Y-axis pushing frame. The Y-axis pushing module pushes the Y-axis pushing frame to drive the Y-axis positioning push block to move along the Y-axis direction.

[0061] like Figure 6 As shown, the four sides of the turntable mechanism 4 are respectively provided with a battery cell fixing 41 assembly, and the battery cell fixing 41 assembly includes four battery cell fixings 41, and each battery cell fixing 41 is used to clamp a battery cell. The turntable mechanism 4 can be an automated turntable: equipped with sensors, a drive motor 1123a and a control system, which can achieve precise rotation control and positioning. The automated turntable is usually integrated with the battery cell fixing 41 assembly to achieve automated processing of the battery cell.

[0062] The battery cell fixing 41 may be a suction cup device.

[0063] like Figure 7As shown, in this embodiment, the code scanning and temperature measuring mechanism 5 includes a code scanner 51, a thermometer 52, a first transverse shift seat 53 and a first transverse shift drive module 54, the code scanner 51 and the thermometer 52 are respectively mounted on the first transverse shift seat 53, the first transverse shift seat 53 is mounted on the first transverse shift drive module 54, and the first transverse shift drive module 54 is used to drive the code scanner 51 and the thermometer 52 to approach or move away from the battery cell. Specifically, the code scanner 51 and the thermometer 52 are respectively provided with 2 groups mounted on the first transverse shift seat 53. The code scanner 51 and the thermometer 52 are integrated into the same mechanism, and synchronous movement is achieved through the first transverse shift seat 53 and the first transverse shift drive module 54. This integrated design reduces the space occupied by the equipment and improves the integration and automation level of the equipment. The code scanning and temperature measuring mechanism 5 can automatically approach the battery cell for code scanning and temperature measurement operations without manual intervention, thereby simplifying the operation process and improving work efficiency.

[0064] like Figure 8 As shown, in one embodiment, the OCV detection mechanism 6 includes a mounting frame 61, a Z transverse driving module 62, a probe mounting seat 63, a positive probe assembly 64 and a negative probe assembly 65, the positive probe assembly 64 and the negative probe assembly 65 are both mounted on the probe mounting seat 63, the probe mounting seat 63 is mounted on the Z transverse driving module 62, the Z transverse driving module 62 is mounted on the mounting frame 61, and the Z transverse driving module 62 is used to drive the probe mounting seat 63 to drive the positive probe assembly 64 and the negative probe assembly 65 to perform lifting movements.

[0065] like Figure 8 As shown, in one embodiment, the positive probe assembly 64 includes a positive mounting base plate 641, a positive mounting panel 642, a first positive probe 643 and a second positive probe 644, the first positive probe 643 and the second positive probe 644 are arranged between the positive mounting base plate 641 and the positive mounting panel 642, and the positive mounting panel 642 fixes the first positive probe 643 and the second positive probe 644 on the positive mounting base plate 641, and the negative probe assembly 65 includes a negative mounting base plate 651, a negative mounting panel 652, a first negative probe 653 and a second negative probe 654, the first negative probe 653 and the second negative probe 654 are arranged between the negative mounting base plate 651 and the negative mounting panel 652, and the negative mounting panel 652 fixes the first negative probe 653 and the second negative probe 654 on the negative mounting base plate 651. The arrangement of the first positive probe 643 and the second positive probe 644 and the first negative probe 653 and the second negative probe 654 enables connection and testing of multiple test points to be performed simultaneously, thereby improving test efficiency.

[0066] like Figure 8As shown, the probe mounting seat 63 is provided with a guide groove 631, and the bottom surfaces of the positive electrode mounting base plate 641 and the negative electrode mounting base plate 651 are respectively provided with guide convex strips 632, and the guide convex strips 632 cooperate with the guide groove 631, and the positive electrode mounting base plate 641 and the negative electrode mounting base plate 651 can move along the guide groove 631 through the guide convex strips 632. The guide groove 631 provided on the probe mounting seat 63 cooperates with the guide convex strips 632 provided on the bottom surfaces of the positive electrode mounting base plate 641 and the negative electrode mounting base plate 651, so that the positive electrode mounting base plate 641 and the negative electrode mounting base plate 651 can move smoothly along the guide groove 631. This design not only improves the adjustability of the probe assembly, but also ensures the stability and accuracy of the probe during movement.

[0067] like Figure 8 As shown, the bottom of the first negative electrode probe 653 and the second negative electrode probe 654 are provided with multiple needle tips 66. The bottom of the first negative electrode probe 653 and the second negative electrode probe 654 are provided with multiple needle tips 66. This design increases the contact area between the probe and the test point, and improves the accuracy and stability of the test. At the same time, the multiple needle tips 66 can also compensate for the decrease in test accuracy caused by probe wear to a certain extent.

[0068] like Fig. 9 As shown, the battery cell NG unloading mechanism 8 includes an NG unloading robot 81, an NG unloading transfer table 82, a first NG material frame 83 and a second NG material frame 84. The battery cells pass through an OCV detection station on the production line. This station is responsible for measuring the open circuit voltage of the battery cells to evaluate the performance of the battery cells. The measuring equipment automatically measures the OCV value of the battery cells and sends the data to the system. The system determines whether the battery cells are qualified according to the set standards. If the OCV value of the battery cell does not meet the preset standard, it is judged as a NG battery cell. When the system identifies the NG battery cell, it will send a signal to the battery cell NG unloading mechanism 8. The identification mechanism in the unloading mechanism (such as a sensor or a visual recognition system) will confirm the position and status of the battery cell. The NG unloading robot 81 accurately grabs the NG battery cell according to the received signal and the information provided by the identification mechanism. The robot removes the NG battery cell from the production line and places it on the NG unloading transfer table 82 for temporary storage. If needed, the NG battery cells on the transfer table can be further classified, such as by NG type or battery cell specification. The classified battery cells are placed by the robot in the first NG material frame 83 or the second NG material frame 84 for subsequent processing and analysis.

[0069] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, or it can be an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0070] In the embodiments of the present application, the devices or elements referred to or implied must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise specified.

[0071] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein, for example, can be implemented in an order other than those illustrated or described herein. In addition, the terms "may include" and "have" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or devices.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, rather than to limit them. Although the embodiments of the present application are described in detail with reference to the above embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features can be replaced by equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An automatic testing machine for cell voltage and internal resistance based on stacked trays, characterized in that: It includes automatic loading and unloading mechanism for stacking trays, variable-pitch loading and handling manipulator, battery cell positioning mechanism, turntable mechanism, code scanning and temperature measurement mechanism, OCV detection mechanism, variable-pitch unloading manipulator and battery cell NG unloading mechanism; The stacking tray automatic loading and unloading mechanism is used to transport the stacking trays to the battery cell loading position and stack and unload the battery cells that have been tested as OK; The loading variable-distance transport manipulator is arranged between the stacking tray automatic loading and unloading mechanism and the battery cell positioning mechanism, and is used to obtain at least two battery cells in the tray and transfer them to the battery cell positioning mechanism with variable distance; The battery cell positioning mechanism is used to synchronously position multiple battery cells, and after positioning, the loading variable-distance handling manipulator transfers the battery cells to the turntable mechanism; The turntable mechanism is arranged on one side of the battery cell positioning mechanism to transfer the battery cell to the code scanning and temperature measuring mechanism; The code scanning and temperature measuring mechanism is arranged on one side of the turntable mechanism, and is used to simultaneously obtain the temperature of the battery cell and the information on the QR code or barcode of the battery cell, and then the turntable mechanism continues to transport the battery cell to the OCV testing mechanism; The OCV detection mechanism is arranged on one side of the turntable mechanism, and is used to perform OCV detection on multiple battery cells at the same time, and then the turntable mechanism continues to transfer the battery cells to the unloading variable-pitch manipulator; The variable-pitch unloading manipulator is used to transfer at least two OK battery cells on the turntable mechanism to the empty trays of the stacking tray automatic loading and unloading mechanism by variable pitch, and to transfer NG battery cells to the battery cell NG unloading mechanism; The battery cell NG unloading mechanism unloads the NG battery cells.

2. According to claim 1, a battery cell voltage and internal resistance automatic testing machine based on stacked trays is characterized by: The automatic loading and unloading mechanism for stacked trays includes a tray feeding positioning device, a tray lifting device, a tray positioning and separating device, an empty material CCD detection device, an empty tray transfer robot and a tray discharging positioning device. The tray feeding positioning device is used to perform initial positioning and fine positioning on the stacked trays respectively. The tray lifting device is arranged in the tray feeding positioning device for lifting the stacked trays. The tray positioning and separating devices are respectively arranged on both sides of the tray feeding positioning device for positioning the single tray on the top layer and separating the tray on the next layer when taking away the tray on the top layer. The empty material CCD detection device is arranged above the tray feeding positioning device for detecting whether the tray on the top layer has a battery cell. The empty tray transfer robot is arranged between the tray feeding positioning device and the tray discharging positioning device. The empty tray transfer robot is used to transfer the empty tray at the tray feeding positioning device to the tray discharging positioning device. The tray discharging positioning device is used to discharge the stacked trays.

3. The battery cell voltage and internal resistance automatic testing machine based on stacked trays according to claim 2, characterized in that: The material tray feeding positioning device includes a feeding pull belt, a stacked material tray initial positioning component, and a stacked material tray fine positioning device. The feeding pull belt is used to convey the stacked material trays. The stacked material tray initial positioning component is arranged on both sides of the feeding pull belt for preliminary positioning of the lower side of the stacked material trays. The stacked material tray fine positioning device is arranged on both sides of the feeding pull belt for fine positioning of the stacked material trays as a whole.

4. The battery cell voltage and internal resistance automatic testing machine based on stacked trays according to claim 2, characterized in that: The tray feeding positioning device also includes a material blocking assembly, which is located above the stacked tray initial positioning assembly and is used to block subsequent stacked trays from entering the fine positioning area.

5. The battery cell voltage and internal resistance automatic testing machine based on stacked trays according to claim 3, characterized in that: The stacking tray initial positioning assembly includes a first initial positioning plate, a second initial positioning plate and an initial positioning drive device, wherein the first initial positioning plate and the second initial positioning plate are respectively arranged on both sides of the feed pull belt, and the initial positioning drive device is used to drive the first initial positioning plate and the second initial positioning plate to move closer to or away from each other.

6. The battery cell voltage and internal resistance automatic testing machine based on stacked trays according to claim 3, characterized in that: The tray positioning and separation device comprises a positioning and separation block and a positioning and separation drive device, the separation block is mounted on the positioning and separation drive device, and the positioning and separation drive device is used to drive the separation block to approach or away from the tray.

7. The battery cell voltage and internal resistance automatic testing machine based on stacked trays according to claim 1, characterized in that: The battery cell positioning mechanism includes an X-axis positioning device, a Y-axis positioning device and a positioning platform. The X-axis positioning device and the Y-axis positioning device are both installed on the positioning platform. The X-axis positioning device is used to position the battery cell in the X-axis direction, and the Y-axis positioning device is used to position the battery cell in the Y-axis direction.

8. The battery cell voltage and internal resistance automatic testing machine based on stacked trays according to claim 1, characterized in that: The code scanning and temperature measuring mechanism includes a code scanner, a thermometer, a first transverse movement seat and a first transverse movement drive module. The code scanner and the thermometer are respectively installed on the first transverse movement seat, and the first transverse movement seat is installed on the first transverse movement drive module. The first transverse movement drive module is used to drive the code scanner and the thermometer to approach or move away from the battery cell.

9. The battery cell voltage and internal resistance automatic testing machine based on stacked trays according to claim 1, characterized in that: The OCV detection mechanism includes a mounting frame, a Z transverse driving module, a probe mounting seat, a positive probe assembly and a negative probe assembly, wherein the positive probe assembly and the negative probe assembly are both mounted on the probe mounting seat, the probe mounting seat is mounted on the Z transverse driving module, the Z transverse driving module is mounted on the mounting frame, and the Z transverse driving module is used to drive the probe mounting seat to drive the positive probe assembly and the negative probe assembly to perform lifting movements.

10. The battery cell voltage and internal resistance automatic testing machine based on stacked trays according to claim 9, characterized in that: The positive probe assembly includes a positive mounting base plate, a positive mounting panel, a first positive probe and a second positive probe, wherein the first positive probe and the second positive probe are arranged between the positive mounting base plate and the positive mounting panel, and the positive mounting panel fixes the first positive probe and the second positive probe on the positive mounting base plate. The negative probe assembly includes a negative mounting base plate, a negative mounting panel, a first negative probe and a second negative probe, wherein the first negative probe and the second negative probe are arranged between the negative mounting base plate and the negative mounting panel, and the negative mounting panel fixes the first negative probe and the second negative probe on the negative mounting base plate.

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