Suction filtration assembly and lithium battery positive electrode material ingredient testing device with same

Abstract

The utility model discloses a suction filtration assembly and a lithium battery positive electrode material batching testing device with the suction filtration assembly, and relates to the technical field of battery manufacturing, and the lower side of the feeding hopper is provided with a hopper output port; the filter comprises a filtering part on the upper side, and a liquid inlet pipe is arranged on the lower side of the filtering part; an air chamber is further arranged on the lower side of the filtering part, the air chamber is provided with a cavity and an air chamber exhaust port, and an exhaust pipe is arranged on the lower side of the air chamber; the connecting sealing plug is located on the outer side of the exhaust pipe; by adopting the design that the liquid inlet pipe is arranged in the exhaust pipe and extends into the collection bottle together with the exhaust pipe, the process that filtrate flows into the collection bottle is not interfered by suction filtration and air exhaust, the accuracy of a test result is ensured, a special suction filtration bottle does not need to be adopted as the collection bottle, a universal flask can be adapted to serve as the collection bottle, and the test accuracy and efficiency can be improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery manufacturing, in particular to a suction filtration component and a lithium battery positive electrode material batching testing device having the same. Background Art

[0002] For the preparation of chemicals and materials, in order to ensure the accuracy of ingredients, a titration process is often required to ensure the accuracy of material content. For example, in the positive electrode material of lithium batteries, the lithium content has many effects on the sintering of positive electrode materials. Therefore, when preparing positive electrode materials for lithium batteries, the lithium content needs to be strictly controlled. In the specific ingredient preparation process, the precursor and lithium salt need to be mechanically mixed in a fixed ratio, and then a small sample is taken. The acid-base titration method is used to determine the titration end point by color change or potentiometric titration, so as to calculate whether the lithium salt content is within the technical specification requirements.

[0003] At present, the main titration methods are manual titration color judgment method and potentiometric titration method: the manual titration color judgment method has large errors and strong randomness, which does not meet the requirements of lithium battery positive electrode materials; the potentiometric titration method is affected by temperature and requires a secondary boiling and cooling process. The potentiometric titration method requires a special suction bottle, which is not suitable for heating operations and is not conducive to filtrate testing. As a result, the solution needs to be transferred to different containers to correspond to different processes, which is not only time-consuming, but also easily interfered with, affecting production efficiency. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a suction filtration component and a lithium battery positive electrode material batching test device having the same.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] A suction filtration assembly according to the first aspect of the utility model embodiment includes a filter, the filter includes a filter part, an air chamber, an exhaust pipe and a liquid inlet pipe, the lower end of the filter part is connected with the liquid inlet pipe, the air chamber has a cavity, the upper end of the air chamber is sealed with the outer wall of the filter part or the outer wall of the liquid inlet pipe, the air chamber is provided with an air chamber exhaust port, the lower end of the air chamber is connected with the exhaust pipe, the liquid inlet pipe passes through the air chamber and the exhaust pipe in sequence and extends out of the lower end of the exhaust pipe, and there is a gap between the outer wall of the liquid inlet pipe and the inner wall of the air chamber and the inner wall of the exhaust pipe; a collecting bottle, the collecting bottle has a cavity and a bottle mouth, and the cavity of the collecting bottle is connected with the bottle mouth; a connecting sealing plug, the connecting sealing plug has a through hole, the inner wall of the through hole of the connecting sealing plug is sealed with the outer wall of the exhaust pipe, the outer wall of the connecting sealing plug is sealed with the bottle mouth of the collecting bottle, and the exhaust pipe passes through the through hole of the connecting sealing plug and extends into the cavity of the collecting bottle.

[0007] As some preferred embodiments of the utility model, a feed funnel is arranged on the filter part, a funnel output port is provided at the lower side of the feed funnel, and the filter part is connected to the funnel output port via a fixing device.

[0008] As some preferred embodiments of the utility model, the filter part is a sand core filter structure, a replaceable filter plate is arranged between the sand core filter structure and the funnel output port, and filter holes are opened on the sand core filter structure.

[0009] As some preferred embodiments of the utility model, the length of the portion of the liquid inlet pipe extending downward from the lower end of the exhaust pipe is a, and the value of a is a≥1 cm.

[0010] As some preferred embodiments of the present utility model, the collecting bottle adopts a triangular beaker.

[0011] According to the suction filtration assembly of the first aspect of the embodiment provided by the utility model, the design of the liquid inlet pipe extending into the collecting bottle inside the exhaust pipe has at least the following technical effects: the process of the filtrate flowing into the collecting bottle is not disturbed by the suction filtration and exhaust, thereby ensuring the accuracy of the test results, and the collecting bottle does not need to be a dedicated suction filtration bottle, and can be adapted to a universal flask as the collecting bottle, which is beneficial to improving the accuracy and efficiency of the test.

[0012] According to the second aspect of the present invention, a lithium battery positive electrode material ingredient testing device includes the above-mentioned filtration component, and also includes an automatic titrator, a vacuum pump and a detection electrode. The automatic titrator is connected to the filtration component through a pipeline, the vacuum pump is connected to the air chamber exhaust port, and the detection electrode detects the solution in the collection bottle.

[0013] As some preferred embodiments of the utility model, the automatic titrator includes a liquid storage bottle, a steering valve and a burette. The steering valve is connected to the liquid storage bottle, the burette and the filtration assembly through pipelines respectively. The automatic titrator can drive the solution in the liquid storage bottle to flow into the burette through the steering valve, and the vacuum pump can drive the solution in the burette to flow into the collecting bottle through the steering valve.

[0014] As some preferred embodiments of the utility model, the automatic titrator also includes a control host, the detection electrode is a photometric electrode, the photometric electrode is electrically connected to the control host, the photometric electrode includes a light source for emitting light and a photodetector for receiving light, and the photometric electrode can be extended into the collecting bottle to detect the solution.

[0015] As some preferred embodiments of the utility model, an electromagnetic stirring table is also included. The collecting bottle can be placed above the electromagnetic stirring table. A magnetic rotor is arranged in the collecting bottle. The electromagnetic stirring table includes a heater and an aluminum-nickel-cobalt alloy high-temperature resistant magnet.

[0016] Some preferred embodiments of the present invention further include an ultrasonic disperser, on which the collecting bottle can be placed.

[0017] According to the lithium battery positive electrode material ingredient testing device provided by the second aspect embodiment of the utility model, by adopting the filtration component of the first aspect embodiment, at least the following technical effects are achieved: the process of the filtrate flowing into the collecting bottle is not disturbed by the filtration and exhaust, thereby ensuring the accuracy of the test results, and the collecting bottle does not need to be a dedicated filtration bottle, and a universal flask can be adapted as the collecting bottle, which is beneficial to improving the accuracy and efficiency of the test.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 It is a structural diagram of the suction filtration component of the utility model;

[0021] Figure 2 This is a structural exploded view of the filtration assembly of the utility model;

[0022] Figure 3 It is a structural diagram of the filter in the utility model;

[0023] Figure 4 It is a top view of the filter part of the utility model;

[0024] Figure 5 This is a structural diagram of the lithium battery positive electrode material batching test device of the utility model;

[0025] Figure 6 It is a test result chart of the utility model.

[0026] Reference numerals:

[0027] A feeding funnel 100, a funnel output port 110, and a fixing device 120; a filter 200, a filter portion 210, a filter hole 211, an air chamber 220, an air chamber exhaust port 221, an exhaust pipe 230, a liquid inlet pipe 240, and a funnel-shaped liquid inlet end 241; a connecting sealing plug 300; an automatic titrator 400, a photometric electrode 410, a control host 420, a steering valve 430, a burette 440, a liquid storage bottle 450, and a supporting stand 460; an electromagnetic stirring platform 500; an ultrasonic disperser 600; and a collecting bottle 700. DETAILED DESCRIPTION

[0028] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0029] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, 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 cannot be understood as a limitation on the present invention.

[0030] In the description of the present utility model, the meaning of "a plurality" is more than two, and "greater than", "less than", "exceed" etc. are understood to exclude the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0031] 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.

[0032] Figure 1 The utility model discloses a filtration assembly according to some embodiments of the utility model.

[0033] Further, see Figure 2 , Figure 3The suction filtration assembly of the utility model includes a filter 200, and the filter 200 includes a filter part 210, an air chamber 220, an exhaust pipe 230 and a liquid inlet pipe 240. The lower end of the filter part 210 is connected to the liquid inlet pipe 240, and the filter part 210 filters the quantitative solution. The inner cavity of the liquid inlet pipe 240 serves as a liquid inlet channel, and the filtered quantitative solution can flow to the liquid inlet channel. The air chamber 220 has a cavity, and the upper end of the air chamber 220 is sealed and connected to the outer wall of the filter part 210 or the outer wall of the liquid inlet pipe 240, so that the air chamber 220 forms a relatively closed structure at the upper side. The air chamber 220 is provided with an air chamber exhaust port 221, and the air chamber 220 and the outside world circulate through the air chamber exhaust port 221. The lower end of the air chamber 220 is connected to the exhaust pipe 230, and the liquid inlet pipe 240 passes through the air chamber 220 and the exhaust pipe 230 in sequence and extends out of the lower end of the exhaust pipe 230. There is a gap between the outer wall of the liquid inlet pipe 240 and the inner wall of the air chamber 220 and the inner wall of the exhaust pipe 230, which serves as an exhaust channel. The exhaust channel and the liquid inlet channel are relatively closed. The air chamber exhaust port 221 is used to be connected to a negative pressure exhaust device, and the negative pressure exhaust device is used to exhaust the above-mentioned exhaust channel. The exhaust work does not affect the flow of the filtrate in the liquid inlet pipe 240.

[0034] Furthermore, the suction filtration assembly of the utility model includes a collecting bottle 700, and the collecting bottle 700 has a cavity and a bottle mouth, and the cavity of the collecting bottle 700 is connected to the bottle mouth.

[0035] Further, refer to Figure 1 , Figure 2 The suction filter assembly of the utility model also includes a connecting sealing plug 300, which has a through hole. The inner wall of the through hole of the connecting sealing plug 300 is sealed to the outer wall of the exhaust pipe 230, and the outer wall of the connecting sealing plug 300 is sealed to the bottle mouth of the collecting bottle 700. The exhaust pipe 230 passes through the through hole of the connecting sealing plug 300 and extends into the cavity of the collecting bottle 700. The lower end of the exhaust pipe 230 is extended to ensure that there is no leakage between the exhaust pipe 230 and the bottle mouth of the collecting bottle 700. The exhaust pipe 230 and the liquid inlet pipe 240 extend into the collecting bottle 700 together, so that the quantitative solution entering from the filter part 210 can flow into the collecting bottle 700 through the liquid inlet pipe 240. The negative pressure suction device can also draw air into the collecting bottle 700 through the exhaust channel. The liquid inlet pipe 240 extends out from the lower end of the exhaust pipe 230 to ensure that the filtrate will not be affected by the airflow formed by the exhaust pipe 230 when flowing into the collecting bottle 700, or even be sucked away, thereby ensuring the accuracy of the test.

[0036] In actual operation, a quantitative solution is injected into the filter section 210, and the negative pressure exhaust device is turned on to reduce the pressure in the collecting bottle 700. After the quantitative solution is filtered through the filter section 210, the filtrate flows into the collecting bottle 700 through the liquid inlet pipe 240 under the combined action of its own gravity and the low pressure in the collecting bottle 700, completing the filtration process and ensuring that the purpose of solid-liquid separation is achieved before testing.

[0037] In the above process, since the exhaust pipe 230 of the exhaust channel extends into the collection bottle 700, and the liquid inlet pipe 240 is inside the exhaust pipe 230 and passes through the exhaust pipe 230 and also extends into the collection bottle 700, it is equivalent to extending the distance of the liquid inlet pipe to drain the filtrate, and preventing the liquid from splashing onto the bottle wall. This is conducive to the detection effect of the solution condition after the titration process is completed, thereby ensuring that the error of the entire titration process is small enough, making the test result more accurate and reliable.

[0038] In addition, the connecting sealing plug 300 is installed on the outside of the exhaust pipe 230, and the liquid inlet pipe 240 is inside the exhaust pipe 230, so that the connecting sealing plug 300 does not need to be connected to the exhaust pipe 230 and the liquid inlet pipe 240 respectively, and the requirements for the structure of the connecting sealing plug 300 are reduced, and a general collecting bottle structure can be directly connected, and there is no need to use a dedicated suction filter bottle. This suction filter bottle requires the exhaust pipe and the liquid inlet pipe to be inserted into the suction filter bottle respectively or the exhaust pipe is set on the suction filter bottle, and it is often not suitable for related testing work due to various reasons such as material, shape, opacity, etc. In this way, after the collecting bottle 700 collects the filtrate, it no longer needs secondary transfer for testing, thereby improving the test stability.

[0039] It must be noted that the collecting bottle 700 using the above technology can be a container commonly used in the prior art. In some embodiments, the collecting bottle 700 is a conical beaker, preferably a glass conical beaker.

[0040] In some embodiments, reference Figure 2 The suction filtration component of the utility model includes a feed funnel 100, and a funnel output port 110 is provided at the lower side of the feed funnel 100. The filter part 210 is connected to the funnel output port 110, and the quantitative solution enters the suction filtration component of the utility model from the feed funnel 100.

[0041] In some embodiments, the feed funnel 100 is a glass liquid adding funnel. The glass liquid adding funnel has high processing precision, which ensures the accuracy of liquid flow. It is also convenient for intuitive observation during the liquid adding process, which is conducive to ensuring that the quantitative liquid adding is sufficiently accurate.

[0042] In some embodiments, the filter unit 210 adopts a sand core filter structure.

[0043] In some embodiments, reference Figure 4A replaceable filter disc is provided on the filter part 210, and a filter hole 211 is opened on the filter part 210, which is conducive to the solution to flow quickly through the filter part 210 after being filtered by the filter disc, reducing the residual solution in the filter part 210 and reducing the negative pressure of the filtration.

[0044] In some embodiments, a liquid guiding surface 212 is disposed between the filter holes 211 . The liquid guiding surface 212 is high in the middle and low around, and is used to guide the solution to flow toward the filter holes 211 , and to prevent the solution from remaining between the filter holes 211 .

[0045] In some embodiments, the diameter of the filter pores 211 is 2 mm.

[0046] In some embodiments, the filter disc between the filter unit 210 and the funnel output port 110 uses a suction filtration membrane to perform suction filtration.

[0047] In some embodiments, reference Figure 2 , Figure 4 A funnel-shaped liquid inlet end 241 is provided between the filter portion 210 and the liquid inlet pipe 240 , and the upper side of the air chamber 220 is connected to the funnel-shaped liquid inlet end 241 .

[0048] In some embodiments, the funnel outlet 110 of the feed funnel 100 and the filter unit 210 are connected via a fixing clip as a fixing device 120 to facilitate connection between the feed funnel 100 and the filter unit 210 .

[0049] In some embodiments, the edge of the funnel outlet 110 has a funnel edge, and the edge of the filter part 210 has a filter surface edge. After the funnel outlet 110 and the filter part 210 are aligned, the fixing device 120 can clamp the funnel edge and the filter surface edge to fix the feed funnel 100 and the filter part 210 together.

[0050] In some embodiments, the air chamber 220 is in the shape of a hollow sphere, so that during the air pumping process, the air chamber 220 plays a role of buffering transition, making the air pumping process more stable.

[0051] In some embodiments, the diameter of the air chamber 220 as a hollow sphere is b, and the diameter of the uppermost position of the exhaust pipe 230 is c, wherein the value range of b and c is: b≥3c.

[0052] In some embodiments, the length of the lower end portion of the liquid inlet pipe 240 extending downward from the exhaust pipe 230 is a, where the value of a is a≥1 cm, further ensuring that the filtrate will not be drawn away by the exhaust pipe 230.

[0053] In some embodiments, the liquid inlet pipe 240 is a vertical pipe structure.

[0054] In some embodiments, the inner diameter of the exhaust pipe 230 decreases from top to bottom, which is equivalent to a structure in which the exhaust pipe 230 is larger at the top and smaller at the bottom, which is not only conducive to the installation of the sealing plug 300 on the exhaust pipe 230, but also conducive to making the exhaust process smoother and more stable.

[0055] In some embodiments, the connection sealing plug 300 is a rubber plug to ensure the sealing effect on the collection bottle.

[0056] In some embodiments, the negative pressure exhaust device uses a vacuum pump.

[0057] In some embodiments, the collecting bottle is a container made of transparent material, so that the detection work is not affected by the obstruction of the container.

[0058] In some embodiments, reference Figure 5 A lithium battery positive electrode material batching test device includes the above-mentioned filtration component, and also includes an automatic titrator 400, a vacuum pump and a detection electrode. The vacuum pump is connected to the air chamber exhaust port 221, and the automatic titrator 400 is connected to the filtration component of the utility model through a pipeline to perform automatic titration. The vacuum pump acts as a negative pressure suction device to evacuate the exhaust channel of the filtration component of the utility model to form a negative pressure, so that the solution of the automatic titrator 400 flows into the filter part 210 of the filtration component of the utility model under the action of negative pressure for filtration, and then the solution flows into the collection bottle 700 through the liquid inlet pipe 240. The detection electrode detects the solution in the collection bottle 700. During the material preparation process, the filtration component of the utility model cooperates with the automatic titrator 400 to control the detection electrode to test the solution in the collection bottle 700 to determine whether the material configuration meets the requirements.

[0059] In some embodiments, the automatic titrator 400 includes a liquid storage bottle 450, a steering valve 430 and a burette 440, and the steering valve 430 is connected to the liquid storage bottle 450, the burette 440 and the suction filter assembly through pipelines. The automatic titrator 400 can drive the solution in the liquid storage bottle 450 to flow into the burette 440 through the steering valve 430, and the vacuum pump can drive the solution in the burette 440 to flow into the collection bottle 700 through the steering valve 430. The solution is first poured into the liquid storage bottle, and the automatic titrator 400 controls the steering valve 430 to quantitatively draw the solution in the liquid storage bottle into the burette 440, and then the steering valve 430 injects the quantitative solution in the burette 440 into the suction filter assembly of the utility model for suction filtration. The control host 420 controls the automatic titrator 400, and records and analyzes the test data of the lithium battery positive electrode material batching test device of the utility model.

[0060] In some embodiments, the automatic titrator 400 controls the steering valve 430 automatically or manually to achieve switching control of the solution flow direction by the steering valve 430 .

[0061] In some embodiments, the steering valve 430 can be switched between at least a closed state, a first working state, and a second working state. When the steering valve 430 is in the closed state, the steering valve 430 is simultaneously sealed with the liquid storage bottle 450, the burette 440, and the suction filter assembly. When the steering valve 430 is in the first working state, the liquid can pass through the steering valve 430 from the liquid storage bottle 450 and the burette 440. When the steering valve 430 is in the second working state, the liquid can pass through the steering valve 430 from the burette 440 and the suction filter assembly of the utility model.

[0062] In some embodiments, the steering valve 430 can also be switched to a third working state. When the steering valve 430 is in the third working state, liquid can flow from the liquid storage bottle 450 through the steering valve 430 and communicate with the suction filtration assembly of the present invention.

[0063] In some embodiments, the steering valve 430 can also be switched to a fourth working state. When the steering valve 430 is in the fourth working state, the steering valve 430 is connected to the liquid storage bottle 450, the burette 440, and the filtration assembly at the same time.

[0064] In some embodiments, the steering valve 430 can also be designed with several different working states according to actual needs, and can be switched to any working state as needed to guide the liquid to flow in different paths or between various positions.

[0065] In some embodiments, the automatic titrator 400 drives the solution in the liquid storage bottle through the diverter valve 430 and is pumped into the burette 440 through the built-in pump.

[0066] In some embodiments, the solution in the burette 440 is evacuated through the exhaust channel of the filtration assembly of the utility model by a vacuum pump to form a negative pressure, so that the solution in the burette 440 is transferred through the diverter valve 430 and then sucked into the filtration assembly of the utility model and collected in the collection bottle 700.

[0067] In some embodiments, an operation panel is provided on the control host 420 .

[0068] In some embodiments, the automatic titrator 400 further includes a control host 420, and the detection electrode is a photometric electrode 410, which is electrically connected to the control host 420. The photometric electrode 410 includes a light source for emitting light and a photoelectric detector for receiving light. The light emitted by the light source passes through the solution in the collecting bottle 700 and is reflected or refracted to the photoelectric detector position for receiving. The photometric electrode 410 can be inserted into the collecting bottle 700 to detect the solution. The light emitted by the light source of the photometric electrode 410 is reflected or refracted after passing through the solution, and the light is received by the photoelectric detector of the photometric electrode 410 to measure the absorbance value. The control host 420 detects the optical changes of the solution passing through the suction filtration component in real time, specifically by inserting the photometric electrode 410 into the collecting bottle, detecting the optical changes (i.e., color changes) of the solution in the collecting bottle in real time online, and outputting the optical change curve in real time online to generate a titration curve, realizing automated detection operation, and performing instrument automated judgment for light of a specific wavelength, thereby improving test repeatability.

[0069] In some embodiments, the photometric electrode 410 is located next to the filtration assembly of the utility model or extends into the collection bottle 700 to ensure the accuracy of the detection data.

[0070] In some embodiments, since it is inconvenient to reversely check the manually identified data, the titration curve can be pre-set with comparison requirements, and the instrument titration data can be confirmed by checking parameters such as slope, mutation position, and liquid addition speed.

[0071] In some embodiments, the measurement optical path of the photometric electrode 410 is 2 cm, the optional light wavelengths are 520 nm, 555 nm, 590 nm, 620 nm, and 660 nm, the spectral bandwidth is ±15 nm, the measurement range is 0-100% transmitted light, and the evaluation threshold is 0-1000 mv / ml2.

[0072] In some embodiments, the length of the photometric electrode 410 is 15-35 cm, preferably 25 cm.

[0073] In some embodiments, the photometric electrode 410 is fixed by a support frame 460 .

[0074] In some embodiments, the support stand 460 has a height of 20-50 cm, preferably 35 cm.

[0075] In some embodiments, the lithium battery positive electrode material batching test device of the utility model further includes an electromagnetic stirring table 500, and a collecting bottle 700 can be placed above the electromagnetic stirring table 500, and a magnetic rotor is arranged in the collecting bottle 700. When the collecting bottle 700 is placed on the electromagnetic stirring table 500, the electromagnetic stirring table 500 generates magnetic induction with the magnetic rotor, driving the magnetic rotor to move and mechanically stir the solution in the collecting bottle 700.

[0076] In some embodiments, the lithium battery positive electrode material batching test device of the utility model further includes an ultrasonic disperser 600, on which a collecting bottle 700 can be placed. After the electromagnetic stirring table 500 completes the stirring work, the collecting bottle 700 is placed on the ultrasonic disperser 600, and the ultrasonic disperser 600 generates ultrasonic waves to ultrasonically disperse the solution, so that the solution in the collecting bottle 700 can be more fully dissolved, thereby improving the test accuracy.

[0077] In some embodiments, the electromagnetic stirring table 500 has a heater, so that the electromagnetic stirring table 500 has a heating function, so that the solution in the collection bottle 700 can be kept in a constant temperature stage in the titration state. The collection bottle 700 is placed on the electromagnetic stirring table 500. During the test, it is only necessary to keep the solution temperature at a preset temperature (for example, 90°C), without the need for secondary heating and boiling to expel carbon dioxide, thereby reducing the test time. The consistency of temperature helps to improve the repeatability of the test. The electromagnetic stirring table 500 uses an aluminum-nickel-cobalt alloy high-temperature resistant magnet. The high-temperature resistance of the aluminum-nickel-cobalt alloy high-temperature resistant magnet can avoid the problem of easy disappearance of magnetism during heating, so that a higher heating temperature can be set to allow the solution to quickly reach the set temperature. At the same time, the magnetism of the aluminum-nickel-cobalt alloy high-temperature resistant magnet is not reduced, so that the magnetic rotor in the collection bottle still maintains sufficient stirring force during rapid heating, thereby improving the uniformity of solution dispersion.

[0078] In some embodiments, the electromagnetic stirring table 500 has a size of 5-20 cm in length, 5-20 cm in width, and 10-30 cm in height, preferably a size of 10 cm in length, 10 cm in width, and 15 cm in height.

[0079] In some embodiments, taking a sample of 0.5 g lithium metal and using a 250 ml conical flask as the collecting bottle 700 as an example, the workflow is as follows:

[0080] 1). Weigh 0.5g of sample into a conical flask, add 150ml of ultrapure water, put in a magnetic rotor, place on an electromagnetic stirring table 500 and stir for 5min at a speed of 400rpm, then place the conical flask on an ultrasonic disperser 600, set the ultrasonic power to 53KHZ, 100% power, and ultrasonically disperse for 1 minute;

[0081] 2) Pour 150 ml of the solution into the liquid storage bottle of the automatic titrator 400 and filter it. Use the filtration assembly of the utility model, connect the Erlenmeyer flask with the filter 200, turn on the vacuum pump, and filter it. In this step, because an ordinary Erlenmeyer flask is used instead of a filtration bottle, it can be directly used for titration testing, thus reducing one solution transfer;

[0082] 3). Use 10 ml of ultrapure water each time to rinse the filter 200 and the conical flask. Repeat three times in total to obtain about 180 ml of filtrate. This step quantifies the amount of rinsing water to ensure the repeatability and reproducibility of the results.

[0083] 4). Heat the 180ml solution in the conical flask to boiling, add 10 drops of methyl red-bromomethylphenol green indicator, transfer to the electromagnetic stirring table 500 with heating function, cooperate with the photometric electrode 410 drop positioning, set the heating temperature to 90 degrees, and ensure that the carbon dioxide is continuously discharged during the titration process;

[0084] 5). Select the wavelength of the photometric electrode as 555nm, set the stirring speed of the electromagnetic stirring table 500 to 90% of step 1), set the pre-feed liquid parameter of the automatic titrator 400 to 12ml, and the automatic titrator 400 adopts the dynamic dropping mode for titration. The control host 420 adopts the broken line mode to evaluate the test structure of the photometric electrode. The evaluation threshold is 70mv / ml2, the trend is positive, and the sample is titrated and the content is evaluated. The test reaction results refer to Figure 6 , including the potential (E) curve and the potential second derivative (d 2 E / dV 2 ) curve, the optical changes of the solution can be directly observed.

[0085] In the description of this specification, the description with reference to the terms "some embodiments" or "it is conceivable that" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0086] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A suction filtration component, characterized in that: include: A filter (200), the filter (200) comprising a filter portion (210), an air chamber (220), an exhaust pipe (230) and a liquid inlet pipe (240); the lower end of the filter portion (210) is in communication with the liquid inlet pipe (240); the air chamber (220) has a cavity; the upper end of the air chamber (220) is sealedly connected to an outer wall of the filter portion (210) or an outer wall of the liquid inlet pipe (240); the air chamber (220) is provided with an air chamber exhaust port (221); the lower end of the air chamber (220) is in communication with the exhaust pipe (230); the liquid inlet pipe (240) passes through the air chamber (220) and the exhaust pipe (230) in sequence and extends out of the lower end of the exhaust pipe (230); and there is a gap between the outer wall of the liquid inlet pipe (240) and the inner wall of the air chamber (220) and the inner wall of the exhaust pipe (230); A collecting bottle (700), wherein the collecting bottle (700) has a cavity and a bottle mouth, and the cavity of the collecting bottle (700) is in communication with the bottle mouth; A connecting sealing plug (300), wherein the connecting sealing plug (300) has a through hole, the inner wall of the through hole of the connecting sealing plug (300) is sealedly connected to the outer wall of the exhaust pipe (230), the outer wall of the connecting sealing plug (300) is sealedly connected to the bottle mouth of the collecting bottle (700), and the exhaust pipe (230) passes through the through hole of the connecting sealing plug (300) and extends into the cavity of the collecting bottle (700).

2. A suction filtration assembly according to claim 1, characterized in that: A feeding funnel (100) is arranged on the filtering part (210), and a funnel output port (110) is provided on the lower side of the feeding funnel (100), and the filtering part (210) is connected to the funnel output port (110) via a fixing device (120).

3. A suction filtration assembly according to claim 2, characterized in that: The filter portion (210) is a sand core filter structure, a replaceable filter sheet is provided between the sand core filter structure and the funnel output port (110), and a filter hole (211) is provided on the sand core filter structure.

4. A suction filtration assembly according to claim 1, characterized in that: The length of the portion of the liquid inlet pipe (240) extending downward from the lower end of the exhaust pipe (230) is a, and the value of a is a≥1 cm.

5. A suction filtration assembly according to claim 1, characterized in that: The collecting bottle (700) is a conical beaker.

6. A lithium battery positive electrode material batching test device, characterized in that: It comprises a suction filtration component according to any one of claims 1 to 5, and also comprises an automatic titrator (400), a vacuum pump and a detection electrode, wherein the automatic titrator (400) is connected to the suction filtration component through a pipeline, the vacuum pump is connected to the air chamber exhaust port (221), and the detection electrode detects the solution in the collection bottle (700).

7. A lithium battery positive electrode material batching test device according to claim 6, characterized in that: The automatic titrator (400) comprises a liquid storage bottle (450), a steering valve (430) and a burette (440); the steering valve (430) is respectively connected to the liquid storage bottle (450), the burette (440) and the suction filtration assembly through pipelines; the automatic titrator (400) can drive the solution in the liquid storage bottle (450) to flow into the burette (440) through the steering valve (430); and the vacuum pump can drive the solution in the burette (440) to flow into the collecting bottle (700) through the steering valve (430).

8. A lithium battery positive electrode material batching test device according to claim 6, characterized in that: The automatic titrator (400) further comprises a control host (420), the detection electrode is a photometric electrode (410), the photometric electrode (410) is electrically connected to the control host (420), the photometric electrode (410) comprises a light source for emitting light and a photoelectric detector for receiving light, and the photometric electrode (410) can be extended into the collection bottle (700) to detect the solution.

9. A lithium battery positive electrode material batching test device according to claim 6, characterized in that: It also includes an electromagnetic stirring platform (500), the collecting bottle (700) can be placed above the electromagnetic stirring platform (500), a magnetic rotor is arranged in the collecting bottle (700), and the electromagnetic stirring platform (500) includes a heater and an aluminum nickel cobalt alloy high temperature resistant magnet.

10. A lithium battery positive electrode material batching testing device according to claim 6 or 9, characterized in that: It also includes an ultrasonic disperser (600), and the collecting bottle (700) can be placed on the ultrasonic disperser (600).

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