An adaptive leveling force testing device

Abstract

The application discloses a self-adaptive leveling and force testing device, and belongs to the technical field of battery precise detection equipment. Mainly including a marble base, a plurality of groups of stand columns are vertically and fixedly installed on the upper end face of the marble base, a motor driving assembly is arranged on an upper layer mounting plate, a pressure measuring assembly comprises a plurality of groups of pressure sensors, a pressure head pressing plate and a marble plane pressing plate, the upper ends of the plurality of groups of pressure sensors are fixedly connected with a pressure connecting plate, the lower ends of the plurality of groups of pressure sensors are jointly connected with the pressure head pressing plate, and the marble plane pressing plate is fixedly arranged at the center of a test station of the marble base and vertically and oppositely arranged with the pressure head pressing plate. The self-adaptive leveling and force testing device is composed of a marble base and a vertical frame assembly, is high-rigidity and non-deformation, and has a stable bearing foundation, and solves the problems of traditional pressure head eccentric load, uneven stress and low pressure control precision.

Description

Technical Field

[0001] This application relates to the field of precision battery testing equipment technology, specifically an adaptive leveling and force adjustment testing device. Background Technology

[0002] During the charge-discharge cycle, the repeated insertion and extraction of lithium ions inside the battery causes periodic volume expansion and thickness deformation of the battery body, accompanied by dynamic changes in internal stress and external pressure. The thickness stability, deformation consistency, and charge-discharge pressure characteristics of the battery are the core technical indicators for evaluating the battery's cycle life, structural stability, and safety in use. Therefore, in the battery research and development, sample verification, and quality inspection stages, high-precision testing equipment is needed to simultaneously acquire data on battery thickness, deformation, and pressure changes throughout the entire charge-discharge process.

[0003] Existing conventional battery pressure testing equipment has a simple structure and low level of intelligence, resulting in many technical defects in practical applications. Traditional equipment is generally equipped with mechanical leveling structures such as ball joints and floating joints, which can only achieve passive mechanical leveling. Affected by mechanical wear, structural springback, and assembly gaps, it has problems such as limited leveling accuracy, poor repeatability, and easy generation of hysteresis errors, and cannot meet the precision testing requirements of batteries with small deformation and micro-pressure fluctuations. Meanwhile, traditional equipment often employs a multi-axis synchronous fixed feed mode, lacking intelligent dynamic control capabilities. It cannot adjust the feed stroke based on the actual flatness of the sample or its real-time stress state. When the battery sample surface has flatness errors or is slightly tilted, it is prone to uneven pressure head loading, localized stress concentration, and uneven force distribution, leading to significant deviations in pressure detection and thickness measurement data. Furthermore, traditional equipment cannot dynamically adapt to real-time pressure fluctuations during battery charging and discharging, lacks active force adjustment and voltage stabilization functions, and often uses a dual-sided redundant limiting structure without dedicated safety protection mechanisms. Equipment malfunctions or force deviations can easily cause structural damage and sample failure, resulting in poor test data repeatability and failing to meet the precision testing requirements of high-end batteries.

[0004] In summary, existing testing equipment relies on mechanical passive leveling, lacks software intelligent control capabilities, has low leveling and force adjustment accuracy, poor adaptability to dynamic working conditions, and has redundant limit structure design and lacks equipment safety protection functions. The industry urgently needs a precision testing device that eliminates the mechanical leveling structure, relies on software algorithms to achieve fully automatic intelligent leveling and force adjustment, and is equipped with a single-sided safety protection structure. Therefore, it is necessary to provide an adaptive leveling and force adjustment testing device to solve the above problems.

[0005] It should be noted that the information disclosed in this background section is only for understanding the background technology of this application concept, and therefore may include information that does not constitute prior art. Summary of the Invention

[0006] Based on the aforementioned problems in the existing technology, the problem to be solved by this application is to provide an adaptive leveling and force adjustment testing device, which solves the technical problems of traditional testing equipment relying on mechanical leveling structures, low leveling accuracy, mechanical wear errors, inability to actively and intelligently level and adjust force, easy uneven loading of the pressure head, uneven pressure distribution, and easy loss of control and deviation of the equipment due to lack of protection.

[0007] The technical solution adopted by this application to solve its technical problem is: an adaptive leveling and force-adjusting testing device, including a vertical frame assembly, which includes a marble base. Multiple sets of columns are vertically fixedly installed on the upper surface of the marble base. An upper mounting plate is fixedly installed on the top of the multiple sets of columns. A motor drive assembly is disposed on the upper mounting plate. The motor drive assembly includes three sets of drive motors and three sets of transmission screw assemblies. The three sets of drive motors are fixedly installed on the top surface of the upper mounting plate, and the output end of each set of drive motors is respectively connected to one set of transmission screw assemblies. The transmission screw assembly comprises three sets of transmission screw assemblies that vertically penetrate the upper mounting plate. The bottom ends of the three sets of transmission screw assemblies are connected to a pressure connecting plate. A pressure measuring component is located at the lower end of the pressure connecting plate. The pressure measuring component includes multiple pressure sensors, a pressure head plate, and a marble flat plate. The upper ends of the multiple pressure sensors are fixedly connected to the pressure connecting plate, and the lower ends of the multiple pressure sensors are connected to the pressure head plate. The marble flat plate is fixedly located at the center of the test station of the marble base and is vertically opposite to the pressure head plate.

[0008] Furthermore, the multiple sets of columns include column one, column two, column three, column four and column five, and the bottom end of each column is fastened to the upper end surface of the marble base by bolts.

[0009] Furthermore, the three sets of drive motors include drive motor one, drive motor two, and drive motor three, which are arranged sequentially at intervals along the length of the upper mounting plate. The three sets of drive motors are independent of each other and can be adjusted individually. The three sets of transmission screw assemblies include transmission screw assembly one, transmission screw assembly two, and transmission screw assembly three. The lower end of the screw of each transmission screw assembly is fixedly connected to the top surface of the pressure connecting plate.

[0010] Furthermore, the multiple sets of pressure sensors include pressure sensor one and pressure sensor two. The upper ends of both sets of pressure sensors are rigidly fixed to the lower end face of the pressure connecting plate, and the lower ends of both sets of pressure sensors are connected to the pressure head plate.

[0011] Furthermore, a displacement measuring component is assembled on the inner side of the vertical frame assembly. The displacement measuring component includes multiple sets of displacement sensors, all of which are fixedly installed on the inner wall of the vertical frame assembly.

[0012] Furthermore, the multiple sets of displacement sensors include displacement sensor one, displacement sensor two, and displacement sensor three, and the three sets of displacement sensors are arranged sequentially at intervals along the inner sidewall of the vertical frame assembly.

[0013] Furthermore, a limiting component is assembled on one side of the lower part of the vertical frame assembly and the test station. The limiting component includes a limiting screw and a limiting contact. The limiting screw is threaded laterally onto one side of the vertical frame assembly. The inner end of the limiting screw is fixedly connected to the limiting contact. The position of the limiting contact can be adjusted laterally by turning the limiting screw.

[0014] Furthermore, this device has no mechanical leveling structure. Instead, it uses software control algorithms to collect multi-point pressure and displacement data in real time, calculate deviation values, and dynamically control the differentiated feed of each set of drive motors and the transmission screw assembly.

[0015] Furthermore, the first drive motor, the second drive motor, and the third drive motor are independently controllable, and receive software algorithm control commands to achieve differentiated synchronous feeding, thereby driving the pressure connecting plate to complete attitude fine-tuning and pressure equalization adjustment.

[0016] Furthermore, the marble base is made of natural marble. The beneficial effects of this application are: the adaptive leveling and force-adjusting testing device provided by this application uses a marble base in conjunction with a vertical frame assembly to form a high-rigidity, deformation-free, stable load-bearing foundation. Three independently controllable drive motors (1, 2, and 3) and corresponding transmission screw assemblies (1, 2, and 3) are installed on the upper mounting plate, jointly driving the pressure connecting plate and the pressure head plate downwards, completely eliminating the need for traditional mechanical leveling structures. By relying on software algorithms to collect multi-point pressure data from pressure sensor 1 and pressure sensor 2 in real time, and multi-point displacement data from displacement sensor 1, displacement sensor 2, and displacement sensor 3, the differential feed of the three sets of lead screws is dynamically controlled to achieve fully automatic attitude leveling and pressure equalization calibration, thus completely solving the problems of uneven load distribution, uneven force distribution, and low pressure control accuracy of traditional pressure heads.

[0017] In addition to the purposes, features, and advantages described above, this application has other purposes, features, and advantages. A further detailed description of this application will be provided below with reference to the figures. Attached Figure Description

[0018] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1This is an overall schematic diagram of an adaptive leveling and force-adjusting testing device according to this application; Figure 2 for Figure 1 A schematic diagram of the structure of the motor drive assembly; Figure 3 for Figure 2 Schematic diagram of the medium pressure measurement component; The following are the labeling elements in the figure: 1. Vertical frame assembly; 11. Upper mounting plate; 12. Column 1; 13. Column 2; 14. Column 3; 15. Column 4; 16. Column 5; 17. Marble base; 2. Motor drive assembly; 21. Drive motor one; 22. Drive motor two; 23. Drive motor three; 24. Transmission screw assembly one; 25. Transmission screw assembly two; 26. Transmission screw assembly three; 27. Pressure connecting plate; 3. Pressure measurement components; 31. Pressure sensor one; 32. Pressure sensor two; 33. Pressure head and plate; 34. Marble flat plate; 4. Displacement measurement assembly; 41. Displacement sensor one; 42. Displacement sensor two; 43. Displacement sensor three; 5. Limiting assembly; 51. Limiting screw. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0021] like Figures 1-3 As shown, this application provides an adaptive leveling and force adjustment testing device, including as follows: Figures 1-2 As shown, this application provides an adaptive leveling and force adjustment testing device, including a vertical frame assembly 1. The vertical frame assembly 1 is installed in a battery precision testing laboratory or production quality inspection workshop and is used to perform thickness testing, pressure deformation monitoring, and dynamic pressure evolution testing during charge and discharge cycles on lithium battery cells, single cells, and battery sheet materials. The vertical frame assembly 1 includes a marble base 17, which serves as the mounting reference platform for the entire machine. Made of natural marble, the marble base 17 has high flatness, high rigidity, and excellent shock absorption performance. It can effectively isolate external vibration interference, eliminate the influence of the external environment on test data, and provide a stable hardware reference for the high-precision adaptive control of the whole machine's software algorithm. Multiple sets of columns are vertically fixed on the upper surface of the marble base 17, including column 12, column 23, column 34, column 45 and column 516. The bottom of each column is fastened to the upper surface of the marble base 17 with bolts. The top of each column supports and fixes the upper mounting plate 11. The upper mounting plate 11 is a rectangular steel plate that is parallel to the marble base 17. The multiple sets of columns and the upper mounting plate 11 form a stable vertical load-bearing frame structure. The overall frame is evenly stressed and structurally stable. There is no structural deformation during long-term operation, which effectively ensures the accuracy and consistency of the feed adjustment of each axis.

[0022] The upper mounting plate 11 is equipped with a motor drive assembly 2, which includes three sets of drive motors, namely drive motor one 21, drive motor two 22 and drive motor three 23. The three sets of drive motors are fixedly installed on the top surface of the upper mounting plate 11 and are arranged at intervals along the length of the upper mounting plate 11. The three sets of drive motors are independent of each other and can be precisely controlled individually. Each drive motor's output end is connected to a set of transmission screw assemblies, including transmission screw assembly one 24, transmission screw assembly two 25, and transmission screw assembly three 26. All three sets of transmission screw assemblies are vertically installed through the upper mounting plate 11 to ensure that the transmission direction is vertical and without deviation. The bottom ends of the three sets of transmission screw assemblies are connected to a pressure connecting plate 27, which is a horizontally arranged rectangular steel plate. The lower end of the screw of each transmission screw assembly is fixedly connected to the top surface of the pressure connecting plate 27. Each axis can independently fine-tune the feed amount, providing a reliable hardware execution basis for differentiated feed control of the software algorithm.

[0023] The lower end of the pressure connecting plate 27 is fixedly connected to a pressure measuring component 3, which includes multiple pressure sensors, namely pressure sensor 1 31 and pressure sensor 2 32. The upper ends of the two pressure sensors are rigidly fixed to the lower end face of the pressure connecting plate 27. The lower ends of the two pressure sensors are connected to a pressure head plate 33. The pressure head plate 33 is a horizontally arranged rectangular plate used to press the battery sample to be tested downward. A marble flat pressure plate 34 is fixedly installed at the center of the test station of the marble base 17. The marble flat pressure plate 34 and the pressure head plate 33 are vertically aligned and cooperate to support the battery sample to be tested, realize the real-time acquisition of static extrusion pressure and charge and discharge dynamic pressure data, and provide accurate pressure feedback signals for algorithm closed-loop control. This device completely eliminates all traditional mechanical leveling structures such as ball joints and floating joints. Relying on the hardware structure and the software adaptive control algorithm, it realizes fully automatic leveling and force adjustment functions. During the test, the three sets of drive motors abandon the traditional fixed synchronous operation mode and fully receive the real-time control instructions of the software algorithm. They independently fine-tune the feed amount according to the pressure and displacement deviation at each point, accurately correct the horizontal attitude and downward stroke of the pressure connecting plate 27, and realize intelligent attitude correction without mechanical leveling structure.

[0024] like Figures 2-3 As shown, a displacement measurement component 4 is assembled on the inner side of the vertical frame assembly 1. The displacement measurement component 4 includes multiple sets of displacement sensors, namely displacement sensor 1 41, displacement sensor 2 42 and displacement sensor 3 43. All three sets of displacement sensors are fixedly installed on the inner wall of the vertical frame assembly 1. The detection end of the displacement sensor is set to correspond to the motion trajectory of the pressure connecting plate 27 and the pressure head plate 33. It is used to collect the pressing stroke, initial thickness of the sample and displacement data of the pressure deformation in real time, and feed them back to the control system at high frequency. This provides high-precision feedback parameters for the deviation calculation, attitude correction and pressure closed-loop calibration of the software algorithm, and realizes intelligent control of the whole process closed loop.

[0025] At the lower part of the vertical frame assembly 1, on one side of the test station, a single set of limiting components 5 is assembled. The limiting component 5 includes a limiting screw 51 and a limiting contact. The limiting screw 51 is threaded laterally onto the single-sided column of the vertical frame assembly 1. The inner end of the limiting screw 51 is fixedly connected to the limiting contact. The position of the limiting contact can be adjusted laterally by turning the limiting screw 51 to adapt to the single-sided limiting positioning of battery samples of different specifications. Meanwhile, when the equipment malfunctions or the sample is deviated by force, the single-sided limit contact can form a hard barrier to protect the sample and the equipment test structure from abnormal displacement, avoid collision damage to the equipment structure and sample displacement, greatly improve the safety and stability of the equipment operation, ensure the consistency of the benchmark of the software algorithm control, and significantly improve the repeatability and accuracy of the test data.

[0026] During operation, the operator first places the battery sample to be tested in the center of the marble flat plate 34. The single-sided limiting component 5 completes the sample limiting protection and initial positioning. The operator then screws the limiting screw 51 to adjust the lateral position of the limiting contact so that the limiting contact is in close contact with the side wall of the sample to achieve single-sided limiting. Subsequently, test parameters such as the downward stroke, pressure threshold, and pressure stabilization accuracy are set according to the test requirements. After the equipment is started, drive motor 1 21, drive motor 22 and drive motor 3 23 initially move downward synchronously. Through transmission screw assembly 1 24, transmission screw assembly 25 and transmission screw assembly 3 26, the pressure connecting plate 27 and the pressure head plate 33 move downward. After the pressure head plate 33 approaches the sample at the preset distance, the software adaptive leveling and force adjustment program starts working. The system collects multi-channel pressure data in real time through pressure sensor 31 and pressure sensor 32, and simultaneously collects downward displacement and sample deformation data at each point through displacement sensor 41, displacement sensor 42 and displacement sensor 43. The built-in software algorithm compares the multi-channel pressure signal and displacement signal in real time, accurately calculates the indenter tilt deviation, sample flatness error and pressure distribution difference, and dynamically outputs precise correction commands for each drive motor, independently adjusting the downward stroke and feed speed of the three sets of transmission screw components. When there is slight unevenness on the surface of the battery under test or the sample is placed at an angle, the algorithm can quickly compensate for the feed amount of each axis and correct the tilt posture of the indenter in real time, so that the indenter plate 33 is uniformly attached to the upper surface of the sample throughout the entire area, completely eliminating the problems of local false pressure, off-center load and stress concentration. Throughout the test, the software continuously monitors and dynamically fine-tunes the feed parameters of each axis to ensure that the pressure head is in full contact with the sample and that the pressure is uniform and stable. The single-sided limit component 5 plays a protective and limiting role throughout the process, avoiding the risk of equipment loss of control. The pressure sensor collects static extrusion pressure and dynamic charging and discharging pressure data in real time, while the displacement sensor collects sample thickness and deformation displacement data simultaneously. The equipment can independently complete battery static thickness detection and static extrusion pressure testing, or it can be used with charging and discharging equipment to simultaneously monitor the dynamic pressure changes and thickness deformation patterns throughout the entire charging and discharging process of the battery. It relies on pure software algorithms to achieve high-precision adaptive leveling and force adjustment testing. After the test is completed, the three sets of drive motors rotate in opposite directions, causing the pressure connecting plate 27 and the pressure head plate 33 to lift and reset. The operator takes out the test sample and puts in the next test sample to enter the next test cycle.

[0027] In summary, this device uses a marble base 17 in conjunction with a vertical frame assembly 1 to form a high-rigidity, deformation-free, and stable load-bearing foundation. The upper mounting plate 11 is equipped with three sets of independently controllable drive motors 1-21, 22, and 3-23, as well as corresponding transmission screw kits 1-24, 25, and 3-26, which together drive the pressure connecting plate 27 and the pressure head plate 33 to press down, completely eliminating the traditional mechanical leveling structure. Based on software algorithms, multi-point pressure data from pressure sensor 1 (31) and pressure sensor 2 (32) and multi-point displacement data from displacement sensor 1 (41) and displacement sensor 2 (42) and displacement sensor 3 (43) are collected in real time. The three sets of lead screws are dynamically controlled to achieve fully automatic attitude leveling and pressure equalization calibration, which completely solves the problems of uneven load, uneven force, and low pressure control accuracy of traditional pressure heads. Simultaneously, it can collect pressure, sample thickness, and deformation data, supporting full-process monitoring of dynamic pressure and thickness deformation under battery charging and discharging conditions. Combined with the limit screw 51 and limit contact of the single-sided limit component 5, it realizes single-sided limit protection of the sample, avoids the risk of uncontrolled displacement of the equipment, ensures the safe operation of the equipment, the uniformity of the test benchmark, and the high data repeatability. The overall structure has strong rigidity, excellent anti-interference ability, high test accuracy, and wide applicability. It can be widely used in the research and development testing and quality inspection of lithium battery cells, single cells, and thin sheet materials.

[0028] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An adaptive leveling and force-adjusting testing device, characterized in that: include: A vertical frame assembly (1) includes a marble base (17), on which multiple sets of columns are vertically fixedly installed, and an upper mounting plate (11) is fixedly installed at the top of the multiple sets of columns. The motor drive assembly (2) is mounted on the upper mounting plate (11). The motor drive assembly (2) includes three sets of drive motors and three sets of transmission screw assemblies. The three sets of drive motors are fixedly mounted on the top surface of the upper mounting plate (11). The output end of each set of drive motors is connected to a set of transmission screw assemblies. The three sets of transmission screw assemblies are vertically mounted through the upper mounting plate (11). The bottom ends of the three sets of transmission screw assemblies are connected to a pressure connecting plate (27). The pressure measurement component (3) is located at the lower end of the pressure connecting plate (27). The pressure measurement component (3) includes multiple pressure sensors, a pressure head plate (33), and a marble flat plate (34). The upper ends of the multiple pressure sensors are fixedly connected to the pressure connecting plate (27), and the lower ends of the multiple pressure sensors are connected to the pressure head plate (33). The marble flat plate (34) is fixedly located at the center of the test station of the marble base (17) and is vertically opposite to the pressure head plate (33).

2. The adaptive leveling and force-adjusting testing device according to claim 1, characterized in that: The multiple sets of columns include column one (12), column two (13), column three (14), column four (15) and column five (16), and the bottom end of each column is fastened to the upper surface of the marble base (17) by bolts.

3. The adaptive leveling and force-adjusting testing device according to claim 2, characterized in that: The three sets of drive motors include drive motor one (21), drive motor two (22) and drive motor three (23), which are arranged in sequence at intervals along the length of the upper mounting plate (11). The three sets of drive motors are independent of each other and can be adjusted individually. The three sets of transmission screw kits include transmission screw kit one (24), transmission screw kit two (25) and transmission screw kit three (26), and the lower end of the screw of each transmission screw kit is fixedly connected to the top surface of the pressure connecting plate (27).

4. The adaptive leveling and force-adjusting testing device according to claim 3, characterized in that: The multiple pressure sensors include pressure sensor one (31) and pressure sensor two (32). The upper ends of the two pressure sensors are rigidly fixed to the lower end face of the pressure connecting plate (27), and the lower ends of the two pressure sensors are connected to the pressure head plate (33).

5. The adaptive leveling and force-adjusting testing device according to claim 4, characterized in that: The vertical frame assembly (1) is equipped with a displacement measuring assembly (4) on its inner side. The displacement measuring assembly (4) includes multiple sets of displacement sensors, all of which are fixedly installed on the inner wall of the vertical frame assembly (1).

6. The adaptive leveling and force-adjusting testing device according to claim 5, characterized in that: The multiple sets of displacement sensors include displacement sensor one (41), displacement sensor two (42) and displacement sensor three (43), and the three sets of displacement sensors are arranged sequentially at intervals along the inner sidewall of the vertical frame assembly (1).

7. The adaptive leveling and force-adjusting testing device according to claim 6, characterized in that: The lower part of the vertical frame assembly (1) and one side of the test station are equipped with a limiting assembly (5). The limiting assembly (5) includes a limiting screw (51) and a limiting contact. The limiting screw (51) is threaded laterally onto one side of the vertical frame assembly (1). The inner end of the limiting screw (51) is fixedly connected to the limiting contact. The position of the limiting contact can be adjusted laterally by turning the limiting screw (51).

8. The adaptive leveling and force-adjusting testing device according to claim 1, characterized in that: This device has no mechanical leveling structure. It uses software control algorithms to collect multi-point pressure and displacement data in real time and calculate the deviation value to dynamically control the differentiated feed of each set of drive motors and the transmission screw assembly.

9. The adaptive leveling and force-adjusting testing device according to claim 3, characterized in that: The drive motor 1 (21), drive motor 2 (22) and drive motor 3 (23) are independently controllable. They receive software algorithm control commands to achieve differentiated synchronous feeding, and drive the pressure connecting plate (27) to complete attitude fine adjustment and pressure equalization adjustment.

10. The adaptive leveling and force-adjusting testing device according to claim 1, characterized in that: The marble base (17) is made of natural marble.

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