Device for measuring free electrolyte

Abstract

The application discloses a free electrolyte measuring device and relates to the technical field of lithium ion batteries. The free electrolyte measuring device comprises a base, a collector, a supporting column and a lifting mechanism arranged on the base, a placing table for fixing a to-be-measured battery cell and a pressure mechanism. The collector is located directly below a first side of the placing table. The middle part of the placing table is hinged to the supporting column, and the second side is connected to the lifting mechanism. The lifting mechanism is used for driving the second side of the placing table to lift relative to the first side, so as to correspondingly adjust the inclination angle of the placing table. The pressure mechanism is used for applying pressure to the to-be-measured battery cell provided with an opening, so that the free electrolyte in the to-be-measured battery cell flows into the collector through the opening. The free electrolyte measuring device can solve the problem that the existing aluminum shell battery cell adopts the gravity pouring method to take liquid, and human error leads to inaccurate measurement of the amount of free electrolyte.

Description

Technical Field

[0001] This application relates to the field of lithium-ion battery technology, and more specifically, to a measuring device for free electrolyte. Background Technology

[0002] In the production process of lithium-ion batteries, formation is a very important step. During this process, the electrolyte undergoes a series of complex reactions. Part of the electrolyte is used to form a solid electrolyte interphase (SEI) film, while another part of the electrolyte remains inside the battery as free electrolyte, that is, electrolyte that has not participated in the reaction or has not been adsorbed.

[0003] Accurately determining the free electrolyte content is crucial for evaluating battery performance and the stability of the manufacturing process. By measuring the free electrolyte level in different batches of batteries, the consistency of the production process can be monitored. If an anomaly is found in the free electrolyte level of a particular batch, formation process parameters such as temperature, charging rate, and time can be adjusted promptly to optimize battery performance. Furthermore, the free electrolyte level is closely related to battery safety. Excessive free electrolyte may lead to leakage or gas expansion in high-temperature environments or under overcharging conditions, potentially even causing safety accidents.

[0004] In existing technologies, the collection of free electrolyte in aluminum-cased battery cells primarily employs gravity pouring. However, in practice, it's difficult for different operators to maintain consistent techniques, pouring angles, and force. This leads to significant human error in the collected free electrolyte volume, failing to accurately reflect the actual internal state of the battery. Such inaccurate measurements may mislead battery performance evaluations and adjustments to production processes, ultimately affecting the overall quality and stability of battery production. Utility Model Content

[0005] The purpose of this application is to provide a device for measuring free electrolyte, which can solve the problem that the measurement of free electrolyte is inaccurate due to human error caused by the gravity tilting method for taking electrolyte from aluminum-cased cells.

[0006] The embodiments of this application are implemented as follows:

[0007] A first aspect of this application provides a device for measuring free electrolyte, including a base, a collector, a support column, and a lifting mechanism disposed on the base for fixing a placement platform for a battery cell under test, and a pressure mechanism. The collector is located directly below a first side of the placement platform. The middle part of the placement platform is hinged to the support column, and a second side is connected to the lifting mechanism. The lifting mechanism is used to drive the second side of the placement platform to rise and fall relative to the first side, thereby adjusting the tilt angle of the placement platform. The pressure mechanism is used to apply pressure to the battery cell under test, which has an opening, so that the free electrolyte in the battery cell under test flows into the collector through the opening. This device for measuring free electrolyte can solve the problem of inaccurate measurement of free electrolyte due to human error caused by the gravity tilting method for taking electrolyte from aluminum-cased batteries.

[0008] As one possible implementation, the placement platform is equipped with a disassembly tool, which is used to cut the battery cell under test to form the opening.

[0009] In one possible implementation, the placement platform is provided with a driving component, and the disassembly tool is provided with a blade. The driving component is connected to the disassembly tool for driving the disassembly tool to move toward the side closer to the battery cell under test, so that the blade cuts the casing of the battery cell under test to form the opening.

[0010] As one possible implementation, the placement platform is provided with a clamp for fixing the battery cell under test onto the placement platform.

[0011] In one possible implementation, the clamp is fixedly mounted on the top of the placement platform, the bottom of the placement platform is provided with a through groove, the fixed end of the pressure mechanism is mounted on the base, and the output end can pass through the through groove, so that the pressure mechanism cooperates with the clamp to squeeze the battery cell under test.

[0012] In one possible implementation, the clamp is movably disposed on the top of the placement platform, and the pressure mechanism is connected to the clamp in a transmission manner. The pressure mechanism is used to drive the clamp to move toward the side closer to the battery cell under test, so as to squeeze the battery cell under test by the clamp cooperating with the placement platform.

[0013] As one possible implementation, the placement platform is provided with a flow guide channel, which is detachably connected to the placement platform, and the inlet of the flow guide channel is connected to the battery cell under test, and the outlet is connected to the collector.

[0014] As one possible implementation, the tilt angle of the placement platform is 0° to 70°.

[0015] As one possible implementation, a weighing scale is also included, located directly below the collector, to weigh the collector.

[0016] As one possible implementation, a transparent protective cover is also provided on the base, which covers the collector, the support column, the lifting mechanism, the placement platform and the pressure mechanism.

[0017] The beneficial effects of the embodiments of this application include:

[0018] The measuring device includes a base, a collector, a support column, and a lifting mechanism mounted on the base for fixing a placement platform for the battery cell under test, and a pressure mechanism. The collector is located directly below the first side of the placement platform. The middle of the placement platform is hinged to the support column, and the second side is connected to the lifting mechanism. The lifting mechanism is used to move the second side of the placement platform relative to the first side to adjust the tilt angle of the placement platform. The pressure mechanism applies pressure to the battery cell under test, which has an opening, so that the free electrolyte inside the battery cell flows into the collector through the opening. This application can precisely control the tilt angle of the placement platform through the lifting mechanism, using a uniform preset angle for each measurement to avoid angle fluctuations caused by manual tilting. Furthermore, the pressure mechanism applies constant pressure to ensure consistent pressure intensity each time, avoiding differences in the amount of free electrolyte flowing out due to variations in the force of manual pressing. Therefore, measurement errors can be reduced, meeting the high-precision requirements for quantitative analysis of the free electrolyte in the battery cell under test, and contributing to improving the production quality of lithium batteries. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 One of the structural schematic diagrams of the free electrolyte measuring device provided in the embodiments of this application;

[0021] Figure 2 A second schematic diagram of the structure of the free electrolyte measuring device provided in the embodiments of this application;

[0022] Figure 3 A third schematic diagram of the structure of the free electrolyte measuring device provided in the embodiments of this application;

[0023] Figure 4 This is a schematic diagram of the structure of a free electrolyte measuring device provided in another embodiment of this application.

[0024] Icons: 100-Measuring device; 10-Base; 20-Collector; 30-Support column; 40-Lifting mechanism; 50-Placement platform; 51-Disassembly tool; 52-Clamp; 60-Pressure mechanism; 70-Measuring scale; 80-Transparent protective cover; 200-Battery cell under test. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0026] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. These terms are used only for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "horizontal," "vertical," etc., do not indicate that the component must be absolutely horizontal or suspended, but can be slightly tilted. The terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] Please refer to the reference. Figures 1 to 4This application provides a free electrolyte measuring device 100, including a base 10, a collector 20, a support column 30, and a lifting mechanism 40 disposed on the base 10 for fixing a placement platform 50 of a battery cell 200 to be tested, and a pressure mechanism 60. The collector 20 is located directly below the first side of the placement platform 50. The middle part of the placement platform 50 is hinged to the support column 30, and the second side is connected to the lifting mechanism 40. The lifting mechanism 40 is used to drive the second side of the placement platform 50 to rise and fall relative to the first side, so as to adjust the tilt angle of the placement platform 50 accordingly. The pressure mechanism 60 is used to apply pressure to the battery cell 200 with an opening, so that the free electrolyte in the battery cell 200 flows into the collector 20 through the opening. This free electrolyte measuring device 100 can solve the problem of inaccurate measurement of free electrolyte due to human error when using the gravity tilting method to collect electrolyte from aluminum-cased batteries.

[0029] It should be noted that the measuring device 100 includes a base 10, a collector 20, a support column 30, a lifting mechanism 40, a placement platform 50, and a pressure mechanism 60. The base 10 serves as the overall supporting foundation of the device, providing a flat and stable mounting surface for the collector 20, support column 30, and lifting mechanism 40, preventing spillage of free electrolyte or angular deviation due to shaking of the base 10 during measurement. The collector 20 is used to collect the free electrolyte flowing from the battery cell 200 being tested. For example, the collector 20 can be a graduated glass beaker or a polytetrafluoroethylene container to facilitate subsequent weighing or volume measurement. The collector 20 is placed on the placement platform. Directly below the first side of 50, to ensure that after the free electrolyte flows out of the opening of the cell under test 200, it can fall vertically into the collector 20 under the action of gravity; the pressure mechanism 60 is used to apply constant pressure to the cell under test 200 (such as a manual pressure plate, an electric pressure cylinder, and a pressure sensor can be added to monitor the pressure value in real time); the cell under test 200 needs to have an opening in advance (such as drilling a small through hole in the shell of the aluminum-cased cell to allow only the free electrolyte to flow out without damaging the internal structure of the cell), the pressure mechanism 60 can apply pressure to the surface of the cell under test 200 through the pressure plate or pressure head, forcing the free electrolyte in the cell under test 200 to flow out smoothly from the opening.

[0030] The support column 30, as a rigid support structure (such as a metal column or a high-strength plastic column), is vertically fixed to the base 10. The top of the support column 30 can be hinged to the middle of the placement platform 50, forming a fixed rotation fulcrum for the placement platform 50, allowing the placement platform 50 to rotate flexibly around this fixed rotation fulcrum, providing a reference for tilt angle adjustment. The placement platform 50 is a platform (such as a metal plate with anti-slip pads or clamps 52) used to fix the battery cell 200 under test. It needs to have sufficient rigidity to withstand the force of the pressure mechanism 60. The two ends of the placement platform 50 are defined as the first side (i.e., the side closer to the collector 20) and the second side (i.e., the side farther from the collector 20). The middle part of the placement platform 50 is hinged to the support column 30, and the bottom of the second side is connected to the lifting mechanism 40, forming a lever structure with "middle hinge and one side adjustable". The lifting mechanism 40 serves as the power source for angle adjustment (such as a manual screw jack, electric push rod, hydraulic cylinder, or pneumatic cylinder). Its fixed end is connected to the base 10, and its output end (such as the top of the lifting rod) is in contact with or hinged to the bottom of the second side of the placement platform 50. By driving the output end to rise and fall, the second side of the placement platform 50 can be pushed to move up or down, thereby causing the placement platform 50 to rotate around the support column 30, and precisely adjusting the tilt angle of the first side, for example, adjustable from 0° to 70°, to meet the free electrolyte outflow requirements of different test cells 200.

[0031] In actual measurement, firstly, the battery cell 200 to be tested (such as an aluminum-cased battery cell) with a pre-drilled opening is fixed on the placement platform 50, ensuring that the opening of the battery cell 200 faces the first side of the placement platform 50 (i.e., the bottom of the opening is directly opposite the collector 20); then, the second side of the placement platform 50 is raised or lowered by the lifting mechanism 40, causing the placement platform 50 to rotate around the support column 30 to a preset tilt angle (such as 30°, 45°, 60°). At this time, the first side faces down and the second side faces up, so that gravity can be used to guide the free electrolyte to flow towards the opening. Subsequently, the pressure mechanism 60 is activated to apply a constant pressure to the cell under test 200 for a certain period of time (e.g., maintaining a pressure of 500 kgf for 180 s). Under the combined action of gravity and pressure, the free electrolyte in the cell under test 200 continuously flows out from the opening and falls vertically into the collector 20 below. Finally, by weighing the collector 20 (e.g., weighing the weight difference before and after the collector 20 with an electronic balance) or reading its volume (e.g., directly reading the graduated collector 20), the accurate content of the free electrolyte in the cell under test 200 is obtained.

[0032] Traditional gravity tilting methods suffer from significant variations in tilting angle, force, and speed among different operators (e.g., tilting at too small an angle results in residual free electrolyte, while tilting at too large an angle causes cell collision). Furthermore, it's difficult for the same person to maintain consistency across multiple operations, directly leading to measurement errors. This application addresses this by using a lifting mechanism 40 to control the tilt angle of the placement platform 50 within ±0.5°, ensuring a uniform preset angle for each measurement and preventing fluctuations caused by human tilting. A pressure mechanism 60 applies constant pressure, ensuring consistent pressure intensity each time and preventing variations in free electrolyte outflow due to differences in pressure applied manually. Therefore, the measurement error rate can be reduced to below 1%, meeting the high-precision requirements for quantitative analysis of free electrolyte in the tested cell 200 and contributing to improved lithium battery production quality.

[0033] Furthermore, when tilting the battery cell 200 by gravity alone, the free electrolyte inside the cell is prone to adsorption on the electrode plates, diaphragm surface, or getting stuck in the corner of the casing, resulting in a residue (the residue rate can reach 10% to 20%), which leads to an underestimation of the measured value. This application, through the design of "gravity + pressure", squeezes the battery cell 200 under constant pressure, causing the adsorbed or residual free electrolyte to detach from the contact surface and flow out from the opening under the guidance of gravity, increasing the electrolyte collection rate to over 95%. This ensures that the measurement results can truly reflect the actual content of free electrolyte inside the battery cell 200 and avoid misjudgment due to residue.

[0034] The base 10 and support column 30 of this application can be made of gray cast iron or ductile iron, the placement platform 50 can be made of high-strength alloy steel or high-quality carbon steel, and the friction parts can be made of copper alloy, engineering plastic or surface-hardened steel, which can withstand long-term high-frequency use (such as measuring 20 to 30 cells 200 to be tested per hour on the production line); the collector 20 is located directly below the first side, and with the inclined design of the placement platform 50, it can avoid the leakage of free electrolyte and contamination of the device or environment; at the same time, the measuring device 100 can be linked with the automation system of the production line (such as the electric lifting mechanism 40 and the pressure mechanism 60 controlled by PLC) to realize semi-automatic operation of loading-measuring-unloading, which greatly improves the efficiency of batch measurement and meets the testing needs in the battery production process.

[0035] In summary, the free electrolyte measuring device 100, through its mechanical design of "precise angle adjustment + constant pressure assistance," fundamentally solves the problems of human error and residue in the traditional gravity pouring method. At the same time, it achieves standardized operation, adaptability to various applications, and efficient batch measurement, providing a high-precision and high-reliability solution for the quantitative analysis of the free electrolyte in the battery cell 200 under test. It is especially suitable for production quality control and R&D testing scenarios of power batteries and consumer batteries.

[0036] As one possible implementation method, such as Figure 1 and Figure 3 As shown, a disassembly tool 51 is provided on the placement platform 50. The disassembly tool 51 is used to cut the battery cell 200 under test to form an opening.

[0037] It should be noted that the disassembly tool 51 can be fixed or detachably installed at a specific position on the placement platform 50 (such as the area near the first side of the placement platform 50, facing the collector 20, or its position can be flexibly adjusted by a slide rail or bracket). Its core function is to cut and process the complete battery cell 200 to be tested (such as an aluminum-cased battery cell without an opening) to precisely form an opening for the free electrolyte to flow out. The disassembly tool 51 can be a dedicated shearing component (such as a miniature hydraulic shear, a precision blade shearing mechanism, or a manual shearing pliers with a positioning groove). The shearing position can be limited by structures such as positioning grooves and limiting blocks (e.g., ensuring that the opening is located at a specific height on the bottom or side wall of the shell of the battery cell 200 under test, avoiding core components such as internal electrodes and diaphragms). The opening size is uniform (e.g., a circular opening with a diameter of 2mm to 5mm, or a strip opening with a width of 1mm to 3mm). This avoids damage to the internal structure of the battery cell 200 under test due to an excessively large opening (e.g., electrode detachment) or an excessively small opening that prevents the free electrolyte from flowing out smoothly. The shearing head of the disassembly tool 51 can be adjusted according to the size of the battery cell 200 under test (e.g., the thickness of a square aluminum shell, the diameter of a cylindrical battery cell) and the shell material (e.g., aluminum shell, steel shell) (e.g., changing to different sized shearing blades, adjusting the shearing force), making it compatible with a variety of battery cells.

[0038] During actual measurement, firstly, the complete battery cell 200 to be tested is placed in a fixed position on the placement platform 50 (such as an area with anti-slip pads or clamps 52). The positioning structure (such as stops or clips) ensures that the part of the battery cell 200 to be cut is aligned with the cutting head of the disassembly tool 51. Then, the second side of the placement platform 50 is raised and lowered by the lifting mechanism 40, causing the placement platform 50 to rotate around the support column 30 to a preset tilt angle (such as 30°, 45°, or 60°). At this point, the first side faces down and the second side faces up, facilitating the flow of free electrolyte towards the opening using gravity. Subsequently, the disassembly tool 51 is operated (by manually pressing or activating the electric switch) to cut the casing of the battery cell 200 to be tested. A precise cut is made to form an opening of a preset size, with the opening facing the first side of the placement platform 50 to ensure that the free electrolyte can flow to the collector 20. Next, the pressure mechanism 60 is activated to apply a constant pressure to the cell 200 under test for a certain period of time (e.g., maintaining a pressure of 500 kgf for 180 s). Under the combined action of gravity and pressure, the free electrolyte in the cell 200 under test flows continuously out of the opening and falls vertically into the collector 20 below. Finally, the accurate content of the free electrolyte in the cell 200 under test is obtained by weighing the collector 20 (e.g., weighing the collector 20 before and after with an electronic balance) or reading its volume (e.g., directly reading the graduated collector 20).

[0039] As one possible implementation method, such as Figure 1 and Figure 3 As shown, a drive unit is provided on the placement platform 50, and a blade is provided on the disassembly tool 51. The drive unit is connected to the disassembly tool 51 for driving the disassembly tool 51 to move toward the side close to the battery cell 200 under test, so that the blade cuts the shell of the battery cell 200 under test to form an opening.

[0040] It should be noted that the drive unit is fixedly installed at a preset position on the placement platform 50 (such as being fixed to the edge or below the placement platform 50 by a bracket, without interfering with the fixation of the battery cell 200 under test). As the power source of the disassembly tool 51, the drive unit can be electrically driven (such as a micro linear motor, a stepper motor + lead screw assembly, or a small cylinder), and has the characteristics of controllable stroke and adjustable force. The drive distance (to ensure accurate blade cutting depth) and output force (to avoid excessive force that could damage the internal structure of the battery cell or insufficient force that could not cut the shell) can be set by the controller. The disassembly tool 51 is a transmission structure adapted to the drive component (such as a sliding blade holder or linkage bracket). The blade (such as a high-carbon steel sprue blade with a sharp edge and resistance to electrolyte corrosion) is fixed at the front end of the disassembly tool 51, with the blade facing the housing of the battery cell 200 under test. The rear end of the disassembly tool 51 is rigidly connected to the output end of the drive component (such as the slider of a linear motor or the piston rod of a cylinder) (such as bolt fastening or snap locking), forming a power transmission path of "drive component - disassembly tool 51 - blade".

[0041] When an opening is required, first, place the complete battery cell 200 to be tested in a fixed position on the placement platform 50 (such as an area with an anti-slip pad or clamp 52). Use positioning structures (such as blocks or clips) to ensure that the part of the battery cell 200 to be cut (such as the area below the side wall of the casing, away from the electrode tabs) is aligned with the cutting edge of the blade, and that the opening position corresponds to the first side of the placement platform 50, so that the free electrolyte can flow to the collector 20. Then, start the drive unit via the controller. The drive unit outputs power to move the disassembly tool 51 along a preset trajectory (such as a horizontal or inclined direction) toward the side closest to the battery cell, and the blade moves accordingly. The disassembly tool 51 moves synchronously, gradually contacting and cutting the housing of the battery cell 200 under test. Then, when the drive unit moves the blade to a preset stroke (such as a cutting depth of 2mm to 3mm, only penetrating the housing to form an opening without damaging the internal electrodes and diaphragm), the drive unit automatically stops moving, and the blade stops cutting. At this time, a uniformly sized opening (such as a circular opening with a diameter of 3mm or a strip opening with a length of 5mm) is formed on the housing of the battery cell 200 under test. Finally, after the opening is completed, the drive unit drives the disassembly tool 51 and the blade to move in opposite directions, returning to the initial position to avoid blocking the pressure path of the subsequent pressure mechanism 60.

[0042] As one possible implementation method, such as Figures 1 to 4As shown, a clamp 52 is provided on the placement stage 50, which is used to fix the battery cell 200 to be tested on the placement stage 50. The clamp 52 clamps the battery cell from multiple directions to ensure that the battery cell 200 to be tested maintains a flat posture during the pressure application process. The pressure can be evenly transmitted to all areas of the battery cell 200 to be tested. With the guidance of the tilt angle, the residual rate of free electrolyte can be significantly reduced, ensuring that the amount of free electrolyte collected is closer to the true value and avoiding measurement deviation caused by residue.

[0043] As one possible implementation method, such as Figures 1 to 3 As shown, the clamp 52 is fixedly installed on the top of the placement platform 50. The bottom of the placement platform 50 is provided with a through groove. The fixed end of the pressure mechanism 60 is installed on the base 10, and the output end can pass through the through groove so that the pressure mechanism 60 and the clamp 52 cooperate to squeeze the battery cell 200 under test.

[0044] It should be noted that the clamp 52 adopts a "top-fixed" method, which is rigidly fixed to the core area of ​​the top surface of the placement platform 50 (corresponding to the cutting position of the disassembly tool 51 and the area directly above the collector 20). It is usually a frame or clamp structure, which can limit the upper position of the battery cell 200 under test from the top or side (such as the top edge of the square battery cell or the upper curved surface of the cylindrical battery cell), so as to prevent the battery cell 200 under test from shifting upward or sideways. The pressure mechanism 60 adopts a "bottom-driven" method. Its fixed end is rigidly connected to the base 10 through a bracket or directly (such as located directly below the placement platform 50, aligned vertically with the clamp 52). The output end (such as the piston rod of the electric push rod or the pressure head of the cylinder) is a columnar or flat structure, and a flexible pad (such as a silicone pad or a rubber pad) can be provided at the top to avoid scratching the bottom surface of the battery cell or crushing the shell.

[0045] When pressure is required, first, place the battery cell 200 to be tested into the clamp 52 at the top of the placement platform 50. The clamp 52 clamps the battery cell 200 from above or the side, limiting its upper position, while ensuring that the bottom surface of the battery cell 200 is directly facing the through slot of the placement platform 50 (i.e., facing the output end of the pressure mechanism 60 below). Then, activate the pressure mechanism 60, and its output end moves vertically upward, passing through the through slot of the placement platform 50, and the top flexible pad contacts the bottom surface of the battery cell 200. Subsequently, the pressure mechanism 60 continues to apply pressure upward. The pressure is preset for a certain period of time (e.g., maintained at 500 kgf for 180 s), forming an "upper and lower pressure" with the top clamp 52. The clamp 52 restricts the upward displacement of the battery cell 200 under test, and the pressure mechanism 60 provides an upward squeezing force from below, so that the free electrolyte inside the battery cell 200 under test flows smoothly out of the shell opening under the combined action of "gravity + pressure" and falls into the collector 20 below. Finally, after the liquid is collected, the output end of the pressure mechanism 60 is reset downward and exits the through groove. The clamp 52 is released, and the battery cell 200 under test can be taken out.

[0046] As one possible implementation method, such as Figure 4 As shown, the clamp 52 is movably disposed on the top of the placement table 50, and the pressure mechanism 60 is connected to the clamp 52 in a transmission manner. The pressure mechanism 60 is used to drive the clamp 52 to move toward the side close to the battery cell 200 under test, so that the clamp 52 and the placement table 50 cooperate to squeeze the battery cell 200 under test.

[0047] It should be noted that the clamp 52 is mounted on the top of the placement platform 50 via movable structures such as slide rails and guide rods (e.g., the bottom of the clamp 52 slides in conjunction with the slide rail on the top surface of the placement platform 50), and can move horizontally or vertically in the direction of approaching or moving away from the battery cell 200 under test; the clamping surface of the clamp 52 (i.e. the side in contact with the battery cell 200 under test) can be provided with a flexible pad (e.g., a silicone pad or a rubber pad), which can both avoid scratching the battery cell 200 under test and increase friction to prevent the battery cell 200 under test from sliding; the fixed end of the pressure mechanism 60 is mounted on the side or top of the placement platform 50 via a bracket, and the output end is rigidly connected to the clamp 52 (e.g., bolted or hinged), forming a transmission path of "pressure mechanism 60 output force - clamp 52 linear motion"; the power direction of the pressure mechanism 60 is consistent with the movement direction of the clamp 52 (e.g., horizontally driving the clamp 52 to clamp laterally, or vertically driving the clamp 52 to press longitudinally).

[0048] When pressure is required, first, place the battery cell 200 to be tested directly on the preset area of ​​the placement platform 50 (such as a flat surface with positioning marks, which does not need to be fixed in advance), ensuring that the part of the battery cell 200 to be cut is aligned with the disassembly tool 51 and the opening direction is towards the collector 20; then, start the pressure mechanism 60, driving the clamp 52 to move along the guide structure towards the battery cell 200 to be tested, until the flexible pad of the clamp 52 contacts the surface of the battery cell 200 to be tested and applies a preset pressure for a certain period of time (such as 500 kgf). Under pressure for 180 seconds, the placement platform 50 acts as a rigid support surface, forming a "side-to-side or top-to-bottom squeezing" with the clamp 52. The clamp 52 provides active clamping force, and the placement platform 50 provides reaction force, firmly clamping the battery cell 200 under test between the two, ensuring that the battery cell 200 under test does not shift during subsequent disassembly, tilting, and liquid removal. Finally, after liquid removal is completed, the pressure mechanism 60 drives the clamp 52 to move in the opposite direction, detaching it from the battery cell 200 under test, and the battery cell 200 under test can be removed, completing one measurement cycle.

[0049] As one possible implementation, the placement platform 50 is provided with a flow guide channel, which is detachably connected to the placement platform 50. The inlet of the flow guide channel is connected to the battery cell 200 under test, and the outlet is connected to the collector 20. By adding a flow guide channel (the cross-sectional shape can be U-shaped or V-shaped, and the material can be a material resistant to electrolyte corrosion, such as polytetrafluoroethylene or PP plastic) to the placement platform 50 using a detachable structure (such as a buckle, magnetic attraction, or positioning pin + slot), it can be ensured that the free electrolyte flows stably from the opening of the battery cell 200 under test into the collector 20, avoiding spillage or residue. Furthermore, during weighing measurement, the flow guide channel can be detached from the placement platform 50 and weighed together to further reduce the measurement error caused by the free electrolyte remaining in the flow guide channel.

[0050] As one possible implementation method, such as Figure 1 and Figure 4 As shown, the measuring device 100 also includes a weighing scale 70, which has a range of 500g and an accuracy of 0.01g. The weighing scale 70 is located directly below the collector 20 to weigh the collector 20, thereby directly weighing the free electrolyte in the collector 20 and avoiding errors caused by manually transferring the collector 20 during weighing.

[0051] As one possible implementation method, such as Figure 1 and Figure 4 As shown, the measuring device 100 also includes a transparent protective cover 80 disposed on the base 10. The transparent protective cover 80 covers the collector 20, support column 30, lifting mechanism 40, placement platform 50 and pressure mechanism 60 to prevent free electrolyte leakage from polluting the environment and affecting human health.

[0052] The above description is merely an optional 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.

[0053] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this application will not describe the various possible combinations separately.

Claims

1. A measuring device for free electrolyte, characterized in that, The device includes a base, a collector, a support column, and a lifting mechanism mounted on the base for fixing a placement platform for a battery cell under test, and a pressure mechanism. The collector is located directly below a first side of the placement platform. The middle part of the placement platform is hinged to the support column, and the second side is connected to the lifting mechanism. The lifting mechanism is used to drive the second side of the placement platform to rise and fall relative to the first side, thereby adjusting the tilt angle of the placement platform. The pressure mechanism is used to apply pressure to the battery cell under test, which has an opening, so that the free electrolyte inside the battery cell under test flows into the collector through the opening.

2. The measuring device for free electrolyte according to claim 1, characterized in that, The placement platform is equipped with a disassembly tool, which is used to cut the battery cell under test to form the opening.

3. The measuring device for free electrolyte according to claim 2, characterized in that, The placement platform is equipped with a driving component, and the disassembly tool is equipped with a blade. The driving component is connected to the disassembly tool for driving the disassembly tool to move toward the side closer to the battery cell under test, so that the blade cuts the casing of the battery cell under test to form the opening.

4. The measuring device for free electrolyte according to claim 1, characterized in that, The placement platform is equipped with a clamp, which is used to fix the battery cell under test on the placement platform.

5. The measuring device for free electrolyte according to claim 4, characterized in that, The clamp is fixedly mounted on the top of the placement platform, and the bottom of the placement platform is provided with a through groove. The fixed end of the pressure mechanism is mounted on the base, and the output end can pass through the through groove so that the pressure mechanism and the clamp can cooperate to squeeze the battery cell under test.

6. The measuring device for free electrolyte according to claim 4, characterized in that, The clamp is movably mounted on the top of the placement platform. The pressure mechanism is connected to the clamp via a transmission mechanism. The pressure mechanism is used to drive the clamp to move toward the side closer to the battery cell under test, so as to squeeze the battery cell under test by cooperating with the placement platform through the clamp.

7. The measuring device for free electrolyte according to claim 1, characterized in that, The placement platform is provided with a flow guide channel, which is detachably connected to the placement platform. The inlet of the flow guide channel is connected to the battery cell under test, and the outlet is connected to the collector.

8. The measuring device for free electrolyte according to claim 1, characterized in that, The tilt angle of the placement platform is 0° to 70°.

9. The measuring device for free electrolyte according to claim 1, characterized in that, It also includes a weighing scale located directly below the collector to weigh the collector.

10. The measuring device for free electrolyte according to claim 1, characterized in that, It also includes a transparent protective cover disposed on the base, which covers the collector, the support column, the lifting mechanism, the placement platform and the pressure mechanism.

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