Battery expansion force testing device and testing method thereof

Abstract

The invention discloses a battery expansion force testing device and a testing method thereof, and relates to the technical field of battery testing. The battery expansion force testing device comprises a transparent case, an observation window communicated with the interior is formed in the outer wall of the transparent case, a first supporting frame is fixedly installed in the transparent case, a second supporting frame is fixedly installed on the top face of the first supporting frame, and a third supporting frame is fixedly installed on the top face of the first supporting frame; a servo motor and a controller are fixedly installed on the top face of the second supporting frame, an electric push rod is fixedly installed on the outer wall of the second supporting frame and electrically connected with the servo motor, the movable end of the electric push rod slidably penetrates through the first supporting frame, a force sensor is installed on the electric push rod, and a fixed clamping plate is fixedly installed at the movable end of the electric push rod. The battery expansion force testing device and the testing method thereof have the advantages that the adaptability is high, and different battery types and testing requirements can be met in the testing preparation stage.

Description

Technical Field

[0001] The present invention relates to the technical field of battery testing, and in particular to a battery expansion force testing device and a testing method thereof. Background Art

[0002] With the rapid development of the new energy industry, the performance and safety of batteries as core components have attracted much attention. During the charging and discharging process, the battery will undergo volume changes, generating expansion force, and the magnitude and change trend of the expansion force have an important impact on the battery life, safety and overall performance of the battery pack. For example, excessive expansion force may cause the battery shell to rupture, internal short circuit, and cause safety accidents; uneven expansion will also affect the consistency of each battery in the battery pack and reduce the overall performance of the battery pack.

[0003] There are many problems in the existing battery expansion force testing technology. On the one hand, the fixtures and instruments used in traditional testing methods have poor versatility and are difficult to adapt to different types of batteries, which limits the test scope and application scenarios. On the other hand, the accuracy of some testing equipment is insufficient and cannot accurately measure tiny expansion forces and displacement changes, resulting in large errors in test data and cannot provide a reliable basis for battery research and development and production. In addition, some testing processes are cumbersome and have a low degree of automation, which not only consumes a lot of manpower and time, but also easily introduces human errors, affecting the accuracy and reliability of the test results. Therefore, it is urgent to develop a comprehensive, accurate, efficient and adaptable expansion force testing method for multiple battery types. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide a battery expansion force testing device and a testing method thereof, which can solve the problems in the background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a battery expansion force testing device, comprising a transparent case, an outer wall of the transparent case is provided with an observation window communicating with the interior, a first support frame is fixedly installed inside the transparent case, a second support frame is fixedly installed on the top surface of the first support frame, a third support frame is fixedly installed on the top surface of the first support frame, a servo motor and a controller are fixedly installed on the top surface of the second support frame, an electric push rod is fixedly installed on the outer wall of the second support frame, the electric push rod is electrically connected to the servo motor, a movable end of the electric push rod slides through the first support frame, a force sensor is installed on the electric push rod, a fixed clamping plate is fixedly installed on the movable end of the electric push rod, and the fixed clamping plate is in contact with the force sensor; A control panel is installed on the outside of the transparent chassis, which is electrically connected to the electrical components in the entire device. A ceramic plate for placing batteries is fixedly installed inside the transparent chassis, and a displacement sensor is installed on the first support frame.

[0006] Preferably, a battery expansion force testing method includes S1 test preparation: Select the appropriate equipment: Select the appropriate battery expansion force fixture and test instrument according to the battery type (soft pack, square, blade battery) and test requirements. For example, for the automated test of soft pack batteries, a cylinder version fixture can be used in combination with an automated test instrument; for manual low-cost testing, a manual version fixture can be used; Check the equipment status: confirm that all parts of the fixture (press plate, side plate, bolts, sensors) are intact, calibrate the displacement meter and force sensor, ensure that the force sensor accuracy reaches ±0.5% (measured by sensor reading) and the displacement sensor accuracy reaches ±1μm. At the same time, check whether the control panel, controller, and servo motor of the automated testing instrument are normal; Install the equipment: Install the fixture firmly on the test platform. If using an automated test instrument, connect the components according to the instructions, ensure that the sensor and controller are connected correctly, and that the charging and discharging wire holes are convenient for battery wiring; Prepare batteries and accessories: Select the batteries to be tested, record the brand, material, and batch information, prepare the charging and discharging equipment, data acquisition card, and cables, and ensure that the charging and discharging equipment can work normally and the data acquisition card data transmission is stable; S2 manual version fixture test: Place the battery and reset it: Open the test software, place the battery correctly between the clamp plates, and reset the force value display; Apply preload: With the help of a scale or displacement meter, tighten the bolts evenly to make the plates roughly parallel, and then operate precisely to achieve the target preload and ensure the parallelism of the plates; Measuring the gap and wiring: Use a digital caliper or displacement meter to measure the gap between the platens, record the initial data, and then correctly connect the battery electrodes and the charging and discharging equipment; Connect the acquisition card to collect data: Connect the data acquisition card to the fixture and the computer, open the acquisition software to check the communication, and collect the expansion force, displacement, voltage, current, and temperature data during the battery charge and discharge cycle after confirming that it is correct; S3 automated testing instrument test: Set the test mode and parameters: select constant spacing, constant force or the switching mode between the two on the instrument control panel or software interface, and enter the target spacing, force value and cut-off condition; S4 test ended: Stop the test and save the data: After the test is completed, stop the data collection in time and save the data to the computer storage device in the format provided by the software; Disassemble and organize equipment: carefully disassemble the battery, clean the test platform and fixtures, put the equipment parts back in place, and perform simple maintenance on the fixtures and instruments, such as checking the condition of bolts and sensors, in preparation for the next test; S5 Data Analysis and Report Writing: Use professional software to analyze data, draw expansion force-time and displacement-time curves, study battery expansion characteristics, and write a test report containing battery information, test equipment, mode, data and conclusions.

[0007] Preferably, the S3 automated test instrument operates in different modes during testing: Constant spacing mode: After inputting the parameters, the instrument automatically adjusts the pressure plate to the target spacing. When the battery shrinks, the pressure plate does not move. When the battery expands, the instrument increases the pressure to maintain the spacing. The test stops when the cut-off condition is reached or the safety threshold is triggered. Install the battery and start the test: Install the battery correctly between the pressure plates, close the test cabin door, and start the test program after confirming that the equipment is normal. The instrument automatically collects and records data.

[0008] Preferably, the S3 automated test instrument operates in different modes during testing: Constant force mode: Input parameters, the instrument squeezes the battery to the target force, continues to increase the pressure when the battery shrinks, and reduces the pressure when it expands. The test stops when the cut-off condition is reached or the safety threshold is triggered.

[0009] Preferably, the S3 automated test instrument operates in different modes during testing: Constant force to constant spacing mode: Run in constant force mode first, record the real-time spacing as the new target spacing when the cutoff condition is triggered, and switch to constant spacing mode to continue testing.

[0010] Preferably, the S3 automated test instrument operates in different modes during testing: Constant spacing to constant force mode: Run in constant spacing mode first, record the real-time force value as the new target force when the cut-off condition is triggered, and switch to constant force mode to continue testing.

[0011] Compared with the prior art, the present invention has the following beneficial effects: 1. The battery expansion force testing device and its testing method are highly adaptable: In the test preparation stage, according to different battery types (soft-pack batteries, square batteries, blade batteries) and test requirements, you can flexibly select the appropriate battery expansion force fixture and testing instrument. Whether it is a test scenario with high automation requirements or a manual test with a limited budget, it can provide a suitable solution, greatly improving the versatility and applicability of the test method and meeting different R&D and production needs.

[0012] 2. The battery expansion force test device and its test method, high-precision test: by strictly checking the integrity and accuracy of the equipment, ensuring that the force sensor accuracy reaches ±0.5% of the sensor indication, and the displacement sensor displacement accuracy reaches ±1μm. Key parameters meet the requirements, which provides a guarantee for accurately measuring the battery expansion force and displacement changes. Accurate test data can more truly reflect the performance changes of the battery during the charging and discharging process, and provide strong support for the optimal design and quality control of the battery.

[0013] 3. The battery expansion force test device and its test method are easy and efficient to operate: the manual version of the fixture test steps are clear and concise. From placing the battery, applying preload to measuring the gap and collecting data, each link has detailed operation instructions, which lowers the technical threshold of operators and improves the efficiency and accuracy of manual testing. The automated test instrument further simplifies the test process. By setting different test modes and parameters, the instrument can automatically complete the test process and collect and record data in real time, greatly reducing manpower input and test time, while avoiding the interference of human factors on the test results.

[0014] 4. The battery expansion force testing device and its testing method, comprehensive data collection and analysis: During the test process, whether manual or automated testing, the battery's expansion force, displacement, voltage, current, and temperature multi-dimensional data during the charge and discharge cycle can be fully collected. After the test, professional data analysis software is used to conduct in-depth analysis of the data and draw expansion force-time and displacement-time curves, which is helpful for in-depth research on the expansion characteristics of the battery at different stages and provide a comprehensive and scientific basis for battery performance evaluation and improvement.

[0015] 5. The battery expansion force test device and test method, equipment maintenance and sustainability: The disassembly of the battery and the equipment sorting after the test can not only ensure the normal service life of the equipment, but also make full preparations for the next test. Regular maintenance of the fixture and instruments, such as checking whether the bolts are loose and whether the sensors are normal, will help to timely discover and solve potential problems, ensure that the equipment is always in good working condition, and improve the sustainability and stability of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present invention is further described below in conjunction with the accompanying drawings and embodiments: Figure 1 The present invention is a schematic structural diagram of a battery expansion force testing device.

[0017] Figure numerals: 1. transparent chassis; 2. observation window; 3. first support frame; 4. second support frame; 5. third support frame; 6. controller; 7. servo motor; 8. control panel; 9. electric push rod; 10. fixing splint; 11. force sensor; 12. ceramic plate; 13. displacement sensor. DETAILED DESCRIPTION

[0018] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0019] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0020] In the description of the present invention, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0021] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0022] See also Figure 1 The present invention provides a technical solution: a battery expansion force testing device, comprising a transparent case 1, an outer wall of the transparent case 1 is provided with an observation window 2 communicating with the interior, a first support frame 3 is fixedly installed inside the transparent case 1, a second support frame 4 is fixedly installed on the top surface of the first support frame 3, a third support frame 5 is fixedly installed on the top surface of the first support frame 3, a servo motor 7 and a controller 6 are fixedly installed on the top surface of the second support frame 4, an electric push rod 9 is fixedly installed on the outer wall of the second support frame 4, the electric push rod 9 is electrically connected to the servo motor 7, a movable end of the electric push rod 9 slides through the first support frame 3, a force sensor 11 is installed on the electric push rod 9, a fixed clamping plate 10 is fixedly installed on the movable end of the electric push rod 9, and the fixed clamping plate 10 is in contact with the force sensor 11; A control panel 8 is installed on the outside of the transparent case 1, and the control panel 8 is electrically connected to the electrical components in the entire device. A ceramic plate 12 for placing batteries is fixedly installed inside the transparent case 1, and a displacement sensor 13 is installed on the first support frame 3; When using the device, the battery is placed on the top surface of the ceramic plate 12 through the observation window 2, and the electric push rod 9 drives the fixed clamping plate 10 to clamp the battery for expansion force testing; Further, a battery expansion force testing method includes S1 test preparation: Select the appropriate equipment: Select the appropriate battery expansion force fixture and test instrument according to the battery type (soft pack, square, blade battery) and test requirements. For example, for the automated test of soft pack batteries, a cylinder version fixture can be used in combination with an automated test instrument; for manual low-cost testing, a manual version fixture can be used; Check the equipment status: confirm that all parts of the fixture (press plate, side plate, bolts, sensors) are intact, calibrate the displacement meter and force sensor, ensure that the force sensor accuracy reaches ±0.5% (measured by sensor reading) and the displacement sensor accuracy reaches ±1μm. At the same time, check whether the control panel, controller, and servo motor of the automated testing instrument are normal; Install the equipment: Install the fixture firmly on the test platform. If using an automated test instrument, connect the components according to the instructions, ensure that the sensor and controller are connected correctly, and that the charging and discharging wire holes are convenient for battery wiring; Prepare batteries and accessories: Select the batteries to be tested, record the brand, material, and batch information, prepare the charging and discharging equipment, data acquisition card, and cables, and ensure that the charging and discharging equipment can work normally and the data acquisition card data transmission is stable; S2 manual version fixture test: Place the battery and reset it: Open the test software, place the battery correctly between the clamp plates, and reset the force value display; Apply preload: With the help of a scale or displacement meter, tighten the bolts evenly to make the plates roughly parallel, and then operate precisely to achieve the target preload and ensure the parallelism of the plates; Measuring the gap and wiring: Use a digital caliper or displacement meter to measure the gap between the platens, record the initial data, and then correctly connect the battery electrodes and the charging and discharging equipment; Connect the acquisition card to collect data: Connect the data acquisition card to the fixture and the computer, open the acquisition software to check the communication, and collect the expansion force, displacement, voltage, current, and temperature data during the battery charge and discharge cycle after confirming that it is correct; S3 automated testing instrument test: Set the test mode and parameters: select constant spacing, constant force or the conversion mode between the two on the instrument control panel or software interface, and enter the target spacing, force value and cut-off conditions (such as constant spacing maintenance time, cut-off force, constant force maintenance time, cut-off spacing); Among them, S3 automated test instrument operates in different modes during testing: Constant spacing mode: After inputting the parameters, the instrument automatically adjusts the pressure plate to the target spacing. When the battery shrinks, the pressure plate does not move. When the battery expands, the instrument increases the pressure to maintain the spacing. The test stops when the cut-off condition is reached or the safety threshold is triggered. Constant force mode: Input parameters, the instrument squeezes the battery to the target force, continues to increase the pressure when the battery shrinks, reduces the pressure when it expands, and stops the test when the cut-off condition is reached or the safety threshold is triggered; Constant force to constant spacing mode: Run in constant force mode first, record the real-time spacing as the new target spacing when the cutoff condition is triggered, and switch to constant spacing mode to continue testing; Constant spacing to constant force mode: Run in constant spacing mode first, record the real-time force value as the new target force when the cut-off condition is triggered, and switch to constant force mode to continue testing; Install the battery and start the test: correctly install the battery between the pressure plates, close the test cabin door (if any), and start the test program after confirming that the equipment is normal. The instrument automatically collects and records data; S4 test ended: Stop the test and save the data: After the test is completed, stop the data collection in time and save the data to the computer storage device in the format provided by the software; Disassemble and organize equipment: carefully disassemble the battery, clean the test platform and fixtures, put the equipment parts back in place, and perform simple maintenance on the fixtures and instruments, such as checking the condition of bolts and sensors, in preparation for the next test; S5 Data Analysis and Report Writing: Use professional software to analyze data, draw expansion force-time and displacement-time curves, study battery expansion characteristics, and write a test report containing battery information, test equipment, mode, data and conclusions; Furthermore, the scheme achieves the following effects: Strong adaptability: In the test preparation stage, according to different battery types (soft-pack batteries, square batteries, blade batteries) and test requirements, you can flexibly select the appropriate battery expansion force fixture and test instrument. Whether it is a test scenario with high automation requirements or a manual test with limited budget, it can provide a suitable solution, greatly improving the versatility and applicability of the test method and meeting different R&D and production needs; High-precision testing: By strictly checking the integrity and accuracy of the equipment, we ensure that the force sensor accuracy reaches ±0.5% of the sensor reading and the displacement sensor displacement accuracy reaches ±1μm. Key parameters meet the requirements, which provides a guarantee for accurately measuring the battery expansion force and displacement changes. Accurate test data can more truly reflect the performance changes of the battery during the charging and discharging process, and provide strong support for the optimization design and quality control of the battery. Easy and efficient operation: The manual version of the fixture test has clear steps, from placing the battery, applying preload to measuring the gap, collecting data, each link has detailed operation instructions, which reduces the technical threshold of operators and improves the efficiency and accuracy of manual testing. The automated test instrument further simplifies the test process. By setting different test modes and parameters, the instrument can automatically complete the test process and collect and record data in real time, greatly reducing manpower input and test time, while avoiding the interference of human factors on the test results; Comprehensive data collection and analysis: During the test process, whether it is manual or automated testing, the battery's expansion force, displacement, voltage, current, and temperature multi-dimensional data during the charge and discharge cycle can be fully collected. After the test, professional data analysis software is used to conduct in-depth analysis of the data and draw expansion force-time and displacement-time curves, which is helpful for in-depth research on the battery's expansion characteristics at different stages and provides a comprehensive and scientific basis for battery performance evaluation and improvement; Equipment maintenance and sustainability: Removing the battery and organizing the equipment after the test not only ensures the normal service life of the equipment, but also makes full preparations for the next test. Regular maintenance of the fixtures and instruments, such as checking whether the bolts are loose and whether the sensors are normal, helps to timely discover and solve potential problems, ensure that the equipment is always in good working condition, and improve the sustainability and stability of the equipment.

[0023] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A battery expansion force testing device, comprising a transparent case (1), characterized in that: The outer wall of the transparent case (1) is provided with an observation window (2) communicating with the interior, a first support frame (3) is fixedly installed inside the transparent case (1), a second support frame (4) is fixedly installed on the top surface of the first support frame (3), a third support frame (5) is fixedly installed on the top surface of the first support frame (3), a servo motor (7) and a controller (6) are fixedly installed on the top surface of the second support frame (4), an electric push rod (9) is fixedly installed on the outer wall of the second support frame (4), the electric push rod (9) is electrically connected to the servo motor (7), the movable end of the electric push rod (9) slides through the first support frame (3), a force sensor (11) is installed on the electric push rod (9), a fixed clamping plate (10) is fixedly installed on the movable end of the electric push rod (9), and the fixed clamping plate (10) is in contact with the force sensor (11); A control panel (8) is installed on the outside of the transparent case (1), the control panel (8) is electrically connected to the electrical components in the entire device, a ceramic plate (12) for placing batteries is fixedly installed inside the transparent case (1), and a displacement sensor (13) is installed on the first support frame (3).

2. A battery expansion force testing method, characterized in that: Includes S1 Test Preparation: Select the appropriate equipment: Select the appropriate battery expansion force fixture and test instrument according to the battery type (soft pack, square, blade battery) and test requirements. For example, for the automated test of soft pack batteries, a cylinder version fixture can be used in combination with an automated test instrument; for manual low-cost testing, a manual version fixture can be used; Check the equipment status: confirm that all parts of the fixture (press plate, side plate, bolts, sensors) are intact, calibrate the displacement meter and force sensor, ensure that the force sensor accuracy reaches ±0.5% (measured by sensor reading) and the displacement sensor accuracy reaches ±1μm. At the same time, check whether the control panel, controller, and servo motor of the automated testing instrument are normal; Install the equipment: Install the fixture firmly on the test platform. If using an automated test instrument, connect the components according to the instructions, ensure that the sensor and controller are connected correctly, and that the charging and discharging wire holes are convenient for battery wiring; Prepare batteries and accessories: Select the batteries to be tested, record the brand, material, and batch information, prepare the charging and discharging equipment, data acquisition card, and cables, and ensure that the charging and discharging equipment can work normally and the data acquisition card data transmission is stable; S2 manual version fixture test: Place the battery and reset it: Open the test software, place the battery correctly between the clamp plates, and reset the force value display; Apply preload: Use a ruler or displacement meter to evenly tighten the bolts to make the plates roughly parallel, and then perform precise operations to achieve the target preload and ensure the parallelism of the plates; Measuring the gap and wiring: Use a digital caliper or displacement meter to measure the gap between the platens, record the initial data, and then correctly connect the battery electrodes to the charging and discharging equipment; Connect the acquisition card to collect data: Connect the data acquisition card to the fixture and the computer, open the acquisition software to check the communication, and collect the expansion force, displacement, voltage, current, and temperature data during the battery charge and discharge cycle after confirming that it is correct; S3 automated testing instrument test: Set the test mode and parameters: select constant spacing, constant force or the switching mode between the two on the instrument control panel or software interface, and enter the target spacing, force value and cut-off condition; S4 test ended: Stop the test and save the data: After the test is completed, stop the data collection in time and save the data to the computer storage device in the format provided by the software; Disassemble and organize equipment: carefully disassemble the battery, clean the test platform and fixtures, put the equipment parts back in place, and perform simple maintenance on the fixtures and instruments, such as checking the condition of bolts and sensors, in preparation for the next test; S5 Data Analysis and Report Writing: Use professional software to analyze data, draw expansion force-time and displacement-time curves, study battery expansion characteristics, and write a test report containing battery information, test equipment, mode, data and conclusions.

3. A battery expansion force testing method according to claim 2, characterized in that: The S3 automated test instrument operates in different modes during testing: Constant spacing mode: After inputting the parameters, the instrument automatically adjusts the pressure plate to the target spacing. When the battery shrinks, the pressure plate does not move. When the battery expands, the instrument increases the pressure to maintain the spacing. The test stops when the cut-off condition is reached or the safety threshold is triggered. Install the battery and start the test: Install the battery correctly between the pressure plates, close the test cabin door, and start the test program after confirming that the equipment is normal. The instrument automatically collects and records data.

4. A battery expansion force testing method according to claim 2, characterized in that: The S3 automated test instrument operates in different modes during testing: Constant force mode: Input parameters, the instrument squeezes the battery to the target force, continues to increase the pressure when the battery shrinks, and reduces the pressure when it expands. The test stops when the cut-off condition is reached or the safety threshold is triggered.

5. A battery expansion force testing method according to claim 2, characterized in that: The S3 automated test instrument operates in different modes during testing: Constant force to constant spacing mode: Run in constant force mode first, record the real-time spacing as the new target spacing when the cutoff condition is triggered, and switch to constant spacing mode to continue testing.

6. A battery expansion force testing method according to claim 2, characterized in that: The S3 automated test instrument operates in different modes during testing: Constant spacing to constant force mode: Run in constant spacing mode first, record the real-time force value as the new target force when the cut-off condition is triggered, and switch to constant force mode to continue testing.

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