Direct-discharge ionic conductivity detection instrument

Abstract

The utility model discloses a direct discharge type ionic conductivity detection instrument, which realizes automatic and multi-station ionic conductivity detection, greatly improves the experimental test efficiency and accuracy, and comprises a sealing box, a main body frame arranged in the sealing box, and a pressure applying assembly, a bearing assembly and a liquid injection assembly which are arranged on the main body frame, the sealing box is provided with a sealing door which is movably opened and closed, an air inlet and an air outlet; the pressure applying assembly comprises a pressure plate which performs lifting motion relative to the bearing assembly; a plurality of mounting holes are formed in the pressing disc at equal intervals in the horizontal direction, and movable shafts are mounted in the mounting holes; a first spring is arranged between the movable shaft and the lower surface of the pressure plate; pressing rods are oppositely arranged on the lower end surface of the movable shaft; the bearing assembly comprises a plurality of bearing discs which are mounted on the main body frame and are opposite to the pressing rods respectively, and each bearing disc is provided with an electrolyte tank; the electrolyte injection assembly is arranged on the side edge of the bearing disc and used for automatically injecting electrolyte into all the electrolyte tanks.

Description

Technical Field

[0001] This utility model belongs to the field of battery testing technology, and specifically refers to a straight-line ionic conductivity testing instrument. Background Technology

[0002] Electrode ion resistance / separator ion conductivity are parameters that describe the complexity of lithium ion transport paths in electrode pores or separator pores when a sample is immersed in electrolyte. They directly affect the ion transport efficiency of the battery, and thus affect the battery's rate capability and cycle performance. They are one of the key electrode indicators that experimental R&D personnel pay close attention to.

[0003] Currently, the commonly used methods for detecting ionic conductivity require manual assembly and electrolyte injection in a glove box, followed by testing via an electrochemical workstation. This process is cumbersome and has low overall testing efficiency. Utility Model Content

[0004] The main purpose of this invention is to provide a direct-flow ionic conductivity detector to solve the problems existing in the prior art, realize automated, multi-station ionic conductivity detection, and greatly improve experimental testing efficiency and accuracy.

[0005] To achieve the above objectives, the solution of this utility model is:

[0006] A direct-flow ionic conductivity detector includes a sealed box, a main frame installed inside the sealed box, and a pressure-applying component, a support component, and a liquid injection component installed on the main frame. The sealed box is provided with a movably opening and closing sealing door, an air inlet, and an air outlet. The pressure-applying component includes a pressure plate that moves up and down relative to the support component. The pressure plate has a plurality of mounting holes evenly spaced along the horizontal direction, and a movable shaft is installed in each mounting hole. A first spring is provided between the movable shaft and the lower surface of the pressure plate. A pressure rod is provided opposite to the lower end face of the movable shaft. The support component includes a plurality of support trays installed on the main frame and respectively opposite to each pressure rod, and each support tray is provided with an electrolyte tank. The liquid injection component is located on the side of the support tray and is used to automatically inject electrolyte into each electrolyte tank.

[0007] The main frame includes a top plate, a bottom plate, several pillars, and a back plate; the top plate is parallel to the bottom plate, and the pillars and the back plate are both supported between the top plate and the bottom plate; the pressure-applying component is installed below the top plate, and the support component is installed above the bottom plate.

[0008] The aforementioned direct-flow ionic conductivity detector also includes a dew point sensor and a pressure sensor installed inside the sealed box, which are used to detect the humidity and pressure inside the sealed box, respectively.

[0009] The aforementioned straight-line ion conductivity detector further includes a driving component for driving the pressure application component; the driving component includes a fixed bracket, a first motor, a first guide rod, a lifting plate, a connecting rod, a trapezoidal nut, and a trapezoidal screw; the fixed bracket is installed on the upper surface of the main frame; the first guide rod is connected between the fixed bracket and the main frame; the lifting plate is slidably fitted on the first guide rod; the connecting rod passes through the main frame, and its upper and lower ends are respectively connected to the lifting plate and the pressure plate; a trapezoidal nut is installed on the lifting plate, and the trapezoidal screw is threadedly connected to the trapezoidal nut, with its two ends respectively rotatably fitted to the fixed bracket and the main frame; the first motor is driven by the trapezoidal screw to drive the trapezoidal screw to rotate.

[0010] Preferably, the output end of the first motor is connected to a drive wheel, the circumference of the trapezoidal screw is fixedly connected to a driven wheel, and a synchronous belt is tensioned and wound between the drive wheel and the driven wheel.

[0011] Preferably, the main frame and the fixed bracket are each provided with bearings for the trapezoidal screw to rotate and engage; the main frame is provided with guide sleeves for the connecting rods to pass through; at least two pairs of connecting rods and guide sleeves are provided, and they are arranged at equal angular intervals around the trapezoidal screw.

[0012] A plurality of pressure rod sleeves are provided below the pressure plate, and a plurality of second guide rods are connected to the upper surface of the pressure rod sleeves; the second guide rods are movably inserted through the pressure plate, and a second spring is provided on their circumference; the pressure rod is transmitted to the pressure rod sleeve from the lower surface of the pressure rod sleeve, and at least one sealing ring is provided between its circumference and the pressure rod sleeve.

[0013] Preferably, a spherical pressure head is provided on the lower end face of the movable shaft; a connecting terminal is provided on the pressure rod sleeve, and the connecting terminal is electrically connected to the pressure rod for connecting the EIS module of the instrument; the upper ends of the movable shaft and the second guide rod are both axially limited by a screw located above the pressure plate.

[0014] The liquid injection assembly includes an injection head and an electrolyte bottle disposed on the side of the support tray, and a fluid pump connecting the injection head and the electrolyte bottle; the injection head is horizontally movable and fitted above each electrolyte tank.

[0015] Preferably, the injection assembly further includes a two-way threaded valve connecting the injection head and the fluid pump, and an injection head bracket for mounting the injection head; the injection head bracket is mounted on a slider, which is driven by a second motor to achieve horizontal movement.

[0016] After adopting the above technical solution, the present invention has the following technical effects:

[0017] This invention requires only manual opening and closing of the sealing door to check the instrument's condition and set its parameters; all other testing operations are automatically performed mechanically. Specifically, the sample to be tested is placed in the electrolyte tank, and the injection component injects electrolyte into each electrolyte tank one by one along a horizontal direction. Then, the pressure plate presses down to apply pressure to the sample in the corresponding electrolyte tank, ensuring tight contact. The pressure rod and electrolyte tank are connected to the positive and negative terminals of the instrument's EIS module, respectively, allowing the instrument to detect the ionic conductivity of the electrolyte. Simultaneously, this invention can perform ionic conductivity tests on multiple electrolyte tanks, significantly simplifying manual operation and improving experimental testing efficiency and accuracy. The direct-flow pressure and support components are more rationally designed; only one of the support or injection components needs to move horizontally to achieve single injection head injection into each electrolyte tank, resulting in simpler actions and higher precision. Attached Figure Description

[0018] Figure 1 This is a perspective view of a specific embodiment of the present utility model.

[0019] Figure 2 This is a partial front perspective view of a specific embodiment of the present utility model.

[0020] Figure 3 This is a partial structural perspective view of a specific embodiment of the present utility model.

[0021] Figure 4 This is a partial structural front view of a specific embodiment of the present utility model.

[0022] Figure 5 This is a partial structural cross-sectional view of a specific embodiment of the present utility model.

[0023] Explanation of icon numbers:

[0024] 1-Sealed box; 11-Sealed door;

[0025] 2-Main frame; 21-Top plate; 22-Bottom plate; 23-Column; 24-Back plate; 241-Strip hole; 25-Guide sleeve;

[0026] 3-Pressure application assembly; 31-Pressure plate; 311-Mounting hole; 32-Moving shaft; 33-First spring; 34-Pressure rod; 35-Pressure rod sleeve; 36-Second guide rod; 37-Second spring; 38-Sealing ring; 39-Spherical pressure head; 310-Connecting terminal;

[0027] 4-Supporting assembly; 41-Supporting tray; 42-Electrolyte tank;

[0028] 5-Injection assembly; 51-Injection head; 52-Electrolyte bottle; 53-Fluid pump; 54-Two-way threaded valve; 55-Injection head bracket; 56-Slider; 57-Second motor; 571-Lead screw;

[0029] 6-Drive assembly; 61-Fixed bracket; 62-First motor; 63-First guide rod; 64-Lifting plate; 65-Connecting rod; 66-Trapezoidal nut; 67-Trapezoidal screw; 68-Drive wheel; 69-Driven wheel; 610-Synchronous belt; 620-Bearing. Detailed Implementation

[0030] To further explain the technical solution of this utility model, the following detailed description is provided through specific embodiments.

[0031] refer to Figure 1-5 As shown, this utility model discloses a direct-flow ionic conductivity detector, including a sealed box 1, a main frame 2 installed inside the sealed box 1, and a pressure application component 3, a support component 4, and a liquid injection component 5 installed on the main frame 2.

[0032] The sealed box 1 is equipped with a movable sealing door 11, as well as an air inlet and an air outlet. Figure 1 (Not shown in the image); the air inlet is used to connect to the inert gas tank, and the air outlet is used to connect to the vacuum pump.

[0033] The pressure application component 3 includes a pressure plate 31 that moves up and down relative to the support component 4; the pressure plate 31 has a plurality of mounting holes 311 evenly spaced along the horizontal direction, and a movable shaft 32 is installed in the mounting holes 311; a first spring 33 is provided between the movable shaft 32 and the lower surface of the pressure plate 31, so that the movable shaft 32 has a downward tendency to provide clamping force; a pressure rod 34 is provided opposite to the lower end face of the movable shaft 32; during testing, the first spring 33 with the corresponding elastic coefficient can be selected according to different testing requirements;

[0034] The support assembly 4 includes several support trays 41 mounted on the main frame 2 and respectively opposite to each pressure bar 34, and each support tray 41 is provided with an electrolyte tank 42;

[0035] The electrolyte injection assembly 5 is located on the side of the support tray 41 and is used to automatically inject electrolyte into each electrolyte tank 42.

[0036] With the above solution, this utility model only requires manual opening and closing of the sealing door 11 to check the instrument status and set the instrument parameters. All other testing operations are automatically performed mechanically. Specifically, the sample to be tested is placed in the electrolyte tank 42, and the electrolyte is injected into each electrolyte tank 42 one by one along the horizontal direction by the liquid injection component 5. Then, the pressure plate 31 presses down so that the pressure rod 34 applies pressure to the sample to be tested in the corresponding electrolyte tank 42 to make them fit tightly. The pressure rod 34 and the electrolyte tank 42 are respectively connected to the instrument's EIS module (Electrochemical Impedance Spectroscopy). The positive and negative electrodes of the electrochemical impedance spectroscopy module (EIS) are located, allowing the instrument to detect the ionic conductivity of the electrolyte. Simultaneously, this invention can perform ionic conductivity tests on multiple electrolyte tanks 42, significantly simplifying manual operation and improving experimental testing efficiency and accuracy. The straight-line pressure application component 3 and support component 4 are more rationally designed; only the support component 4 or the injection component 5 needs to move horizontally to achieve single injection head 51 injecting liquid into each electrolyte tank 42, resulting in simpler actions and higher precision.

[0037] The following are specific embodiments of the present invention.

[0038] The main frame 2 includes a top plate 21, a bottom plate 22, several pillars 23, and a back plate 24; the top plate 21 is parallel to the bottom plate 22, and the pillars 23 and the back plate 24 are both supported between the top plate 21 and the bottom plate 22; the pressure-applying component 3 is installed below the top plate 21, and the support component 4 is installed above the bottom plate 22.

[0039] This utility model also includes a dew point sensor and a pressure sensor installed in the sealed box 1, which are used to detect the humidity and pressure in the sealed box 1, respectively. These two sensors can be installed on the main frame 2, that is, above the top plate 21.

[0040] This utility model also includes a drive assembly 6 for driving the pressure application assembly 3; the drive assembly 6 includes a fixed bracket 61, a first motor 62, a first guide rod 63, a lifting plate 64, a connecting rod 65, a trapezoidal nut 66, and a trapezoidal screw 67; the fixed bracket 61 is installed on the upper surface of the main frame 2 (i.e., the upper surface of the aforementioned top plate 21); the first guide rod 63 is connected between the fixed bracket 61 and the main frame 2; the lifting plate 64 is slidably fitted on the first guide rod 63; the connecting rod 65 passes through the main frame 2, and its upper and lower ends are respectively connected to the lifting plate 64 and the pressure plate 31; a trapezoidal nut 66 is installed on the lifting plate 38, and the trapezoidal screw 67 is threadedly connected to the trapezoidal nut 66, and its two ends are respectively rotatably fitted with the fixed bracket 61 and the main frame 2; the first motor 62 is drivenly connected to the trapezoidal screw 67 and is used to drive the trapezoidal screw 67 to rotate. Therefore, the circular motion output by the motor can be converted into the lifting motion of the pressure plate 31, eliminating the need for vertical driving of the pressure plate 31. This saves space in the instrument's height, resulting in a more compact overall structure and a smaller instrument size. In this embodiment, the first motor 62 is mounted on the back of the back plate 24.

[0041] Furthermore, the output end of the first motor 62 is connected to a drive wheel 68, and a driven wheel 69 is fixedly connected to the circumference of the trapezoidal screw 67. A synchronous belt 610 is tensioned and wound between the drive wheel 68 and the driven wheel 69. The drive wheel 68, the driven wheel 69, and the synchronous belt 610 achieve the transmission connection between the first motor 62 and the trapezoidal screw 67. In this embodiment, the main frame 2 and the fixed bracket 61 are both provided with bearings 620 for the trapezoidal screw 67 to rotate and engage.

[0042] Meanwhile, the main frame 2 is provided with a guide sleeve 25 for the connecting rod 65 to pass through; there are at least two pairs of connecting rods 65 and guide sleeves 25, which are arranged at equal angles around the trapezoidal screw 67 to ensure that the lifting and lowering movement of the pressure plate 31 is more stable.

[0043] Below the aforementioned pressure plate 31, several pressure rod sleeves 35 are provided, and several second guide rods 36 are connected to the upper surface of the pressure rod sleeves 35. The second guide rods 36 are movably inserted through the pressure plate 31, and second springs 37 are provided on their circumferences. The pressure rod 34 is transmitted from the lower surface of the pressure rod sleeve 35 to the pressure rod sleeve 35, and at least one sealing ring 38 is provided between its circumference and the pressure rod sleeve 35. The elasticity of the sealing ring 38 can ensure that the pressure rod 34 will not fall out of the movable shaft 32, realizing a detachable connection, and can also prevent electrolyte from entering the pressure rod sleeve 35. In this embodiment, the cross-section of the pressure rod sleeve 35 is square, and a second guide rod 36 is provided at each of its four corners; a spherical pressure head 39 is provided on the lower end face of the movable shaft 32; a connecting terminal 310 is provided on the pressure rod sleeve 35, and the connecting terminal 310 is electrically connected to the pressure rod 34 for connecting the instrument's EIS module; the upper ends of the movable shaft 32 and the second guide rod 36 are axially limited by a screw located above the pressure plate 31 to prevent them from detaching downward from the pressure plate 31.

[0044] The aforementioned liquid injection assembly 5 includes an injection head 51 and an electrolyte bottle 52 disposed on the side of the support tray 41, and a fluid pump 53 connecting the injection head 51 and the electrolyte bottle 52. A two-way threaded valve 54 may also be provided between the fluid pump 53 and the injection head 51. The injection head 51 is horizontally movable and fitted above each electrolyte tank 42. By controlling the opening and closing of the fluid pump 53 and its flow rate, a fixed amount of electrolyte can be automatically injected into the electrolyte tank 42.

[0045] Furthermore, the aforementioned injection assembly 5 also includes an injection head bracket 55 for mounting the injection head 51. The injection head bracket 55 is mounted on a slider 56, which is driven by a second motor 57 to achieve horizontal movement. In this embodiment, the second motor 57 is a lead screw motor, with its lead screw 571 threadedly connected to the slider 56. The second motor 57 and the first motor 62 are mounted together behind the back plate 24, which has a strip hole 241 through which the injection head bracket 55 can move.

[0046] The testing procedure for this utility model is as follows:

[0047] (1) According to the test requirements, the sample to be tested is placed into each electrolyte tank 42, and the electrolyte tank 42 is placed into the support tray 41 in order to realize multi-channel testing;

[0048] (2) Close the sealing door 11, start the vacuum pump to evacuate the sealed box 1 to remove oxygen, and then fill the air inlet with inert gas to ensure that the water oxygen is <10ppm (detected by the dew point sensor and the air pressure sensor).

[0049] (3) The injection head 51 of the injection assembly 5 moves horizontally and injects a certain amount of electrolyte into each electrolyte tank 42 in sequence;

[0050] (4) Start the pressure application component 3, so that the pressure plate 31 drops and drives the pressure rod 34 to apply pressure to the sample to be tested in the electrolyte tank 42 so that it fits tightly;

[0051] (5) Start the EIS module of the instrument (the positive and negative terminals of the EIS module are electrically connected to the pressure rod 34 and the electrolyte tank 42 respectively), and test the electrolyte ion conductivity in multiple electrolyte tanks 42 at the same time.

[0052] The above embodiments and figures are not intended to limit the product form and style of this utility model. Any appropriate changes or modifications made by those skilled in the art should be considered as not departing from the patent scope of this utility model.

Claims

1. A direct-flow ionic conductivity detector, characterized in that: It includes a sealed box, a main frame installed inside the sealed box, and a pressure application assembly, a support assembly, and a liquid injection assembly installed on the main frame; The sealed box is equipped with a movable sealing door, an air inlet, and an air outlet; The pressure application assembly includes a pressure plate that moves up and down relative to the support assembly; the pressure plate has a plurality of mounting holes evenly spaced along the horizontal direction, and a movable shaft is installed in the mounting holes; a first spring is provided between the movable shaft and the lower surface of the pressure plate; a pressure rod is provided opposite to the lower end face of the movable shaft. The support assembly includes several support trays installed on the main frame and respectively opposite to each pressure bar, and each support tray is provided with an electrolyte tank; The electrolyte injection assembly is located on the side of the support tray and is used to automatically inject electrolyte into each electrolyte tank.

2. The linear ion conductivity detector as described in claim 1, characterized in that: The main frame includes a top plate, a bottom plate, several pillars, and a back plate; the top plate is parallel to the bottom plate, and the pillars and the back plate are both supported between the top plate and the bottom plate; the pressure-applying component is installed below the top plate, and the support component is installed above the bottom plate.

3. The linear ion conductivity detector as described in claim 1, characterized in that: It also includes a dew point sensor and a pressure sensor installed inside the sealed box, which are used to detect the humidity and pressure inside the sealed box, respectively.

4. The linear ion conductivity detector as described in claim 1, characterized in that: It also includes a drive assembly for driving the pressure application component; the drive assembly includes a fixed bracket, a first motor, a first guide rod, a lifting plate, a connecting rod, a trapezoidal nut, and a trapezoidal screw; the fixed bracket is installed on the upper surface of the main frame; the first guide rod is connected between the fixed bracket and the main frame; the lifting plate is slidably fitted on the first guide rod; the connecting rod passes through the main frame, and its upper and lower ends are respectively connected to the lifting plate and the pressure plate; a trapezoidal nut is installed on the lifting plate, and the trapezoidal screw is threadedly connected to the trapezoidal nut, with its two ends respectively rotatably fitted to the fixed bracket and the main frame; the first motor is drivenly connected to the trapezoidal screw and is used to drive the trapezoidal screw to rotate.

5. The linear ion conductivity detector as described in claim 4, characterized in that: The output end of the first motor is connected to a drive wheel, and the circumference of the trapezoidal screw is fixedly connected to a driven wheel. A synchronous belt is tensioned and wound between the drive wheel and the driven wheel.

6. The linear ion conductivity detector as described in claim 4, characterized in that: The main frame and the fixed bracket are both equipped with bearings for the trapezoidal screw to rotate and engage; the main frame is equipped with guide sleeves for the connecting rods to pass through; there are at least two pairs of connecting rods and guide sleeves, which are arranged at equal angular intervals around the trapezoidal screw.

7. The linear ionic conductivity detector as described in claim 1, characterized in that: A plurality of pressure rod sleeves are provided below the pressure plate, and a plurality of second guide rods are connected to the upper surface of the pressure rod sleeves; the second guide rods are movably inserted through the pressure plate, and a second spring is provided on their circumference; the pressure rod is transmitted to the pressure rod sleeve from the lower surface of the pressure rod sleeve, and at least one sealing ring is provided between its circumference and the pressure rod sleeve.

8. The linear ion conductivity detector as described in claim 7, characterized in that: A spherical pressure head is provided on the lower end face of the movable shaft; a connecting terminal is provided on the pressure rod sleeve, and the connecting terminal is electrically connected to the pressure rod for connecting the instrument's EIS module; the upper ends of the movable shaft and the second guide rod are both axially limited by a screw located above the pressure plate.

9. The linear ion conductivity detector as described in claim 1, characterized in that: The liquid injection assembly includes an injection head and an electrolyte bottle disposed on the side of the support tray, and a fluid pump connecting the injection head and the electrolyte bottle; the injection head is horizontally movable and fitted above each electrolyte tank.

10. The linear ion conductivity detector as described in claim 9, characterized in that: The injection assembly also includes a two-way threaded valve connecting the injection head and the fluid pump, and an injection head bracket for mounting the injection head; the injection head bracket is mounted on a slider, which is driven by a second motor to achieve horizontal movement.

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