Potentiometric titration device and detection system

Abstract

The utility model provides a potentiometric titration device and a detection system, and belongs to the technical field of batteries. The potentiometric titration device comprises a titration container, a weighing mechanism, a conveying mechanism, a titration mechanism, a controller and an uncovering mechanism. The titration container comprises a container body and a cover body detachably connected with the container body, and the container body is used for containing a sample. And the weighing mechanism is used for weighing the weight of the sample. And the conveying mechanism is used for conveying the titration container containing the sample to the titration position. The titration mechanism comprises a burette and a detection electrode, the burette is used for adding a titrant into the titration container located at the titration position, and the detection electrode is used for detecting the potential of a sample in the titration container. The controller is respectively in signal connection with the weighing mechanism, the conveying mechanism and the titration mechanism. Through integration of the weighing mechanism, the conveying mechanism, the titration mechanism, the controller and the uncovering mechanism, automatic batch continuous sample detection is realized, personal errors are reduced, and the detection efficiency is improved while the reliability of a detection result is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a potentiometric titration device and a detection system. Background Art

[0002] With the development of the lithium battery industry, the requirements for the accuracy of raw material detection are getting higher and higher. Lithium salt is one of the main components of the electrolyte, and HF (hydrogen fluoride) is an important parameter to characterize the decomposition of lithium salt. Too high HF may mean that the lithium salt in the electrolyte is decomposed. HF will further react with the solvent to cause the battery pack to swell. In addition, HF will destroy the solid electrolyte interface (SEI membrane) during the battery cycle, resulting in poor cycle performance. Therefore, detecting the HF content is one of the important indicators for evaluating the quality of the electrolyte.

[0003] Therefore, how to improve the accuracy of HF content detection is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The present application aims to solve at least one of the technical problems in the background technology. To this end, one object of the present application is to provide a potentiometric titration device and a detection system to improve the accuracy of HF content detection in the battery production process.

[0005] The embodiment of the first aspect of the present application provides a potentiometric titration device, comprising: a titration container, a weighing mechanism, a conveying mechanism, a titration mechanism, a controller and a lid-lifting mechanism. The titration container comprises a container body and a cover body detachably connected to the container body, and the container body is used to hold a sample. The weighing mechanism is used to weigh the weight of the sample. The conveying mechanism is used to convey the titration container containing the sample to the titration position. The titration mechanism comprises a burette and a detection electrode, the burette is used to add a titrant to the titration container located at the titration position, and the detection electrode is used to detect the potential of the sample in the titration container. The controller is respectively connected to the weighing mechanism, the conveying mechanism and the titration mechanism signals. The lid-lifting mechanism is constructed to separate the cover body from the container body in a lid-lifting position staggered from the titration position, and to close the cover body to the container body in a cover-closing position staggered from the titration position.

[0006] In the technical solution of the embodiment of the present application, through the integration of a weighing mechanism, a conveying mechanism, a titration mechanism, a controller and a cover-opening mechanism, the weight of the sample is weighed by the weighing mechanism and recorded in the controller, the controller controls the conveying mechanism to convey the titration container containing the sample to the cover-opening position, the cover is removed from the container body by the cover-opening mechanism, and then the container body is conveyed to the titration position, and the titration mechanism is controlled to perform titration and detect the titration end point, thereby calculating the content of the substance to be tested in the sample per unit weight, after the titration is completed, the container body is conveyed to the cover-closing position, and the cover is re-closed on the container body by the cover-opening mechanism, so as to realize automated batch continuous sample detection, reduce human errors, improve the reliability of the detection results and improve the detection efficiency.

[0007] In some embodiments, the horizontal dimension of the longitudinal section of the container body gradually decreases from top to bottom along the vertical direction. By setting a container body that is wide at the top and narrow at the bottom, it is convenient to add samples into the container body, and the use of solvent can be reduced, thereby improving the accuracy of the titration test results.

[0008] In some embodiments, the container body includes a first receiving portion, a connecting portion, and a second receiving portion, which are arranged in sequence from bottom to top along the vertical direction, wherein the inner surface of the connecting portion is a surface inclined along the vertical direction, and the maximum cross-sectional area of ​​the first receiving portion along the horizontal direction is smaller than the minimum cross-sectional area of ​​the second receiving portion along the horizontal direction. By providing a connecting portion with an inclined inner surface, the sample can be guided into the first receiving portion. At the same time, the container body, which is wide at the top and narrow at the bottom, is convenient for adding the sample into the container body, and can also ensure that a sufficient liquid level height can be achieved by adding a small amount of sample, thereby improving the accuracy of the titration test results.

[0009] In some embodiments, the ratio of the maximum cross-sectional area of ​​the first accommodating portion in the horizontal direction to the minimum cross-sectional area of ​​the second accommodating portion in the horizontal direction is greater than or equal to 20% and less than or equal to 80%. This makes it easier to add the sample into the container body and ensures that a small amount of sample is added to have a sufficient liquid level, thereby improving the accuracy of the titration test result.

[0010] In some embodiments, the potentiometric titration device further comprises: a magnetic stirring mechanism, which is used to stir the sample in the container body by magnetic force. By providing the magnetic stirring mechanism, the need for sample stirring can be met and the overall structure can be simplified.

[0011] In some embodiments, the magnetic stirring mechanism includes a magnetic stirrer and a magnetic driver, wherein the magnetic stirrer is disposed in the container body, and the magnetic driver is disposed outside the container body, and the magnetic driver is used to drive the magnetic stirrer to rotate. By arranging the magnetic stirrer to stir the sample, the volume of the container body can be reduced, the use of solvent can be reduced, and the accuracy of the detection can be improved.

[0012] In some embodiments, the magnetic drive is arranged below the drop position, and the magnetic drive is connected to the controller signal. By arranging the magnetic drive below the drop position, the titration and stirring are carried out synchronously.

[0013] In some embodiments, the cover-opening position and the cover-closing position are the same position. By setting the cover-opening position and the cover-closing position to the same position, only one cover-opening mechanism is required to be provided at the cover-opening position to meet the requirements of cover-opening and cover-closing, thereby simplifying the overall structure.

[0014] In some embodiments, the uncovering position is located upstream of the dropping position along the conveying direction of the conveying mechanism, and the closing position is located downstream of the dropping position along the conveying direction of the conveying mechanism, thereby achieving continuous detection of multiple samples in a compact rhythm, thereby improving detection efficiency.

[0015] In some embodiments, the cover-opening mechanism includes a driving unit and an adsorption unit, wherein the adsorption unit is used to be detachably connected to the cover body in an adsorption manner, and the output end of the driving unit is connected to the adsorption unit to drive the adsorption unit to move. By providing a driving unit that drives the adsorption unit to move, the cover-opening operation and the cover-closing operation of the cover body can be realized.

[0016] In some embodiments, the adsorption unit is a magnetic adsorption head, and the cover-opening mechanism is connected to the controller signal. By setting the magnetic adsorption head, the adsorption unit adsorbs the cover body through magnetic force, and at the same time, the adsorption or release of the cover body is completed under the control of the controller.

[0017] In some embodiments, the titration mechanism further includes a lifting assembly, the output end of which is connected to the burette and the detection electrode, so as to drive the burette and the detection electrode to move in a vertical direction, so as to extend the burette and the detection electrode into the container body to complete the titration, and after the titration is completed, the burette and the detection electrode are moved out of the container body, so that the conveying mechanism can continue to convey the container body.

[0018] In some embodiments, the conveying mechanism includes a turntable and a rotating assembly, the turntable has a plurality of mounting positions arranged around the rotation axis of the turntable, the mounting positions are used to hold the titration container, and the rotating assembly is connected to the turntable in a transmission manner to drive the mounting positions on the turntable to rotate to the titration positions in sequence, thereby realizing the titration container to be transported in a rotating manner.

[0019] An embodiment of the second aspect of the present application provides a detection system, which includes the potentiometric titration device in the above embodiment.

[0020] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0022] Figure 1 This is a schematic diagram of the overall structure of a potentiometric titration device according to some embodiments of the present application;

[0023] Figure 2 This is a schematic diagram of the structure of the conveying mechanism of some embodiments of the present application;

[0024] Figure 3 A schematic diagram of a partial structure of a potentiometric titration device according to some embodiments of the present application;

[0025] Figure 4 One of the data line graphs of the titration test results of some embodiments of the present application;

[0026] Figure 5 This is the second data line graph of the titration test results of some embodiments of the present application;

[0027] Figure 6 This is the third data line graph of the titration test results of some embodiments of the present application;

[0028] Figure 7 This is a schematic diagram of the structure of the cover-opening mechanism in some embodiments of the present application;

[0029] Figure 8 This is a schematic diagram of the exploded structure of the cover-lifting mechanism of some embodiments of the present application.

[0030] Description of reference numerals:

[0031] 100. Potentiometric titration device;

[0032] 10. titration container; 11. container body; 111. first receiving portion; 112. connecting portion; 113. second receiving portion; 12. cover body;

[0033] 20. Weighing mechanism;

[0034] 30. Conveying mechanism; 31. Turntable; 32. Rotating assembly;

[0035] 40. titration mechanism; 41. burette; 42. detection electrode; 43. lifting assembly;

[0036] 50. Controller;

[0037] 60. Magnetic stirring mechanism; 61. Magnetic stirring bar; 62. Magnetic drive;

[0038] 70. Lid-opening mechanism; 71. Driving unit; 72. Adsorption unit; 73. Operating arm; 74. Height adjustment pin; 75. Heightening fixed platform; 76. Switching fixed platform;

[0039] 80. Add institutions;

[0040] P1, dripping position; P2, cover opening position; P3, cover closing position; P4, installation position; F, vertical direction. DETAILED DESCRIPTION

[0041] The following embodiments of the technical solution of the present application will be described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0042] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0043] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0044] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0045] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0046] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0047] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0048] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0049] At present, judging from the development of the market situation, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as aerospace and other fields. With the continuous expansion of battery application fields, its market demand is also constantly expanding.

[0050] During the battery production process, the quality of the electrolyte needs to be tested. Lithium salt is one of the main components of the electrolyte, and HF is an important parameter to characterize the decomposition of lithium salt. Too high HF may mean that the lithium salt in the electrolyte is decomposed. HF will further react with the solvent to cause the battery pack to swell. HF will also destroy the SEI film during the battery cycle, resulting in poor cycle performance. Therefore, testing the HF content is one of the important indicators for evaluating the quality of the electrolyte.

[0051] In some cases, the HF content can be detected by titration. However, there are large errors in the titration detection process, which leads to low reliability of the detection results, making it difficult to make an accurate evaluation of the electrolyte quality.

[0052] Based on the above considerations, the present application provides a potentiometric titration device and a detection system, wherein the potentiometric titration device includes a titration container, a weighing mechanism, a conveying mechanism, a titration mechanism, a controller and a lid-lifting mechanism. The titration container includes a container body and a cover body detachably connected to the container body, and the container body is used to hold a sample. The weighing mechanism is used to weigh the weight of the sample. The conveying mechanism is used to convey the titration container containing the sample to the titration position. The titration mechanism includes a burette and a detection electrode, and the burette is used to add a titrant to the titration container located at the titration position, and the detection electrode is used to detect the potential of the sample in the titration container. The controller is respectively connected to the weighing mechanism, the conveying mechanism and the titration mechanism by signal. The lid-lifting mechanism is constructed to separate the cover body from the container body in a lid-lifting position staggered from the titration position, and to cover the cover body to the container body in a cover-closing position staggered from the titration position.

[0053] Through the integration of the weighing mechanism, the conveying mechanism, the titration mechanism, the controller and the uncovering mechanism, the weight of the sample is weighed by the weighing mechanism and recorded in the controller. The controller controls the conveying mechanism to convey the titration container containing the sample to the uncovering position, the uncovering mechanism removes the cover from the container body, and then conveys the container body to the titration position, and controls the titration mechanism to perform titration and detect the titration end point, thereby calculating the content of the substance to be tested in the sample per unit weight. After the titration is completed, the container body is conveyed to the covering position, and the uncovering mechanism re-covers the cover on the container body, so as to realize automated batch continuous sample testing, reduce human errors, improve the reliability of the test results and improve the test efficiency.

[0054] The potentiometric titration device disclosed in the embodiment of the present application can be used for, but not limited to, titration detection of electrolytes. A detection system can be formed using the potentiometric titration device disclosed in the present application, thereby improving the reliability of the detection result and the detection efficiency.

[0055] Combination Figures 1 to 3 As shown, Figure 1 This is a schematic diagram of the overall structure of a potentiometric titration device in some embodiments of the present application. Figure 2 This is a schematic diagram of the structure of the conveying mechanism of some embodiments of the present application. Figure 3 The schematic diagram of the partial structure of the potentiometric titration device of some embodiments of the present application is as follows: The embodiment of the present application provides a potentiometric titration device 100 , including: a titration container 10 , a weighing mechanism 20 , a conveying mechanism 30 , a titration mechanism 40 , a controller 50 and a cover-opening mechanism 70 .

[0056] The titration container 10 includes a container body 11 and a cover body 12 detachably connected to the container body 11, and the container body 11 is used to hold the sample. The weighing mechanism 20 is used to weigh the weight of the sample. The conveying mechanism 30 is used to convey the titration container 10 containing the sample to the dropping position P1. The titration mechanism 40 includes a burette 41 and a detection electrode 42, the burette 41 is used to add titrant to the titration container 10 located at the dropping position P1, and the detection electrode 42 is used to detect the potential of the sample in the titration container 10. The controller 50 is respectively connected to the weighing mechanism 20, the conveying mechanism 30 and the titration mechanism 40. The cover-opening mechanism 70 is configured to separate the cover body 12 from the container body 11 at the cover-opening position P2 staggered from the dropping position P1, and to cover the cover body 12 to the container body 11 at the cover-closing position P3 staggered from the dropping position.

[0057] The titration container 10 is a container with a certain volume for containing samples. During the titration process, the titration container 10 also serves as a container for the sample to react with the titrant.

[0058] The weighing mechanism 20 is used to weigh the weight of the sample in the titration container 10, and feed the weight back to the controller 50, so as to provide calculation parameters for the subsequent calculation of the content of the substance to be measured in the sample. In some embodiments, the weighing mechanism 20 can be an electronic balance, and the weight of the sample in the titration container 10 can be weighed by using the electronic balance, first placing an empty titration container 10 on the electronic balance, and returning the electronic balance to zero, and then adding the sample to the titration container 10 to obtain the weight of the sample in the titration container 10.

[0059] The conveying mechanism 30 is a component with a certain power for conveying the titration container 10 containing the sample toward the titration position P1. In some embodiments, multiple titration containers 10 containing samples can be arranged in sequence along the transmission direction of the conveying mechanism 30 so that multiple samples can be titrated in sequence.

[0060] The titration mechanism 40 is a component for detecting the content of the substance to be tested in the sample by potentiometric titration, and the titration mechanism 40 is arranged at the titration position P1. The principle of potentiometric titration is that the substance to be tested in the sample reacts chemically with the titrant, and the substance to be tested is gradually consumed. At the same time, the ion concentration in the sample changes and causes a potential jump. The potential jump indicates the titration end point, which indicates that the substance to be tested has just been completely consumed. The content of the substance to be tested is calculated by the amount of titrant consumed, and combined with the weight of the sample, the content of the substance to be tested in the sample per unit weight is calculated.

[0061] The controller 50 is used to record the weight of the sample weighed by the weighing mechanism 20, and to control the conveying mechanism 30 to convey the titration container 10 containing the sample to the titration position P1. It is also used to control the titration mechanism 40 to add titrant at an appropriate rate, stop titration when the titration endpoint is detected, and calculate the content of the substance to be tested in the sample.

[0062] Among them, the dropping position P1 is the position for performing titration detection on the sample in the titration container 10. The dropping position P1 can be arranged at a position on the conveying mechanism 30 corresponding to the titration mechanism 40. For example, the dropping position P1 can be located directly below the titration mechanism 40. After the conveying mechanism 30 conveys the titration container 10 to the position directly below the titration mechanism 40, the titration mechanism 40 performs titration detection.

[0063] In some embodiments, after adding the sample into the container body 11, the cover 12 is covered on the container body 11, and the weight of the sample is weighed by the weighing mechanism 20. After the weighing is completed, the titration container 10 is first transported to the cover-opening position P2 by the conveying mechanism 30, and the cover 12 is removed by the cover-opening mechanism 70, so that the burette 41 and the detection electrode 42 can be extended into the container body 11 at the titration position P1. After the titration is completed, the container body 11 is transported to the cover-closing position P3 by the conveying mechanism 30, and the cover 12 is re-covered on the container body 11 by the cover-opening mechanism 70. Among them, the cover 12 can be matched with the opening of the container body 11 by a partially embedded manner to improve the sealing performance.

[0064] In some embodiments, Figure 4 As shown, Figure 4 This is one of the data line graphs of the titration test results of some embodiments of the present application. The same electrolyte sample was tested 6 times using the potentiometric titration device 100 provided in the present application to detect the HF content in the electrolyte. Figure 4 It can be seen that the consistency of the four test results is good. Under the sealing effect of the cover 12, the acid produced by the hydrolysis of lithium hexafluorophosphate in the electrolyte sample due to the influence of moisture in the environment can be reduced, thereby reducing the error of the test and improving the accuracy of the test. By providing the cover 12 matched with the container body 11, the cover is opened before the titration with the cover opening mechanism 70, and the cover is closed again after the titration is completed, the airtightness of the sample before and after the titration is improved, so as to reduce the influence of moisture or other substances in the environment on the test results of the titration, and the pollution of the sample to the environment.

[0065] Through the integration of the weighing mechanism 20, the conveying mechanism 30, the titration mechanism 40, the controller 50 and the cover-opening mechanism 70, the weight of the sample is weighed by the weighing mechanism 20 and recorded in the controller 50. The controller 50 controls the conveying mechanism 30 to convey the titration container 10 containing the sample to the cover-opening position P2, the cover 12 is removed from the container body 11 by the cover-opening mechanism 70, and then the container body 11 is conveyed to the titration position P1, and the titration mechanism 40 is controlled to titrate and detect the titration end point, thereby calculating the content of the substance to be tested in the sample per unit weight. After the titration is completed, the container body 11 is conveyed to the cover-closing position P3, and the cover 12 is re-closed on the container body 11 by the cover-opening mechanism 70, so as to realize automatic batch continuous sample detection, reduce human errors, improve the reliability of the detection results and improve the detection efficiency.

[0066] like Figure 3 As shown, according to some embodiments of the present application, the horizontal dimension of the mid-longitudinal section of the container body 11 gradually decreases from top to bottom along the vertical direction.

[0067] The middle longitudinal section of the container body 11 refers to a section along the longitudinal center line of the container body 11 that divides the container from top to bottom or from one side to the other into two equal parts. The middle longitudinal section is a section parallel to the vertical direction F. The horizontal dimension of the middle longitudinal section of the container body 11 gradually decreases from top to bottom along the vertical direction F. The horizontal dimension is the dimension along the horizontal direction. The horizontal direction is perpendicular to the vertical direction F. It can be understood that along the vertical direction F, the container body 11 is wide at the top and narrow at the bottom. The size of the upper half of the container body 11 is larger than that of the lower half. The opening of the container body 11 is located in the upper half, and the bottom of the container body 11 is located in the lower half. The larger size of the upper half increases the opening to facilitate the addition of samples into the container body 11. The sample is loaded into the smaller size of the lower half, so that a higher liquid level can be reached without adding too much sample, so that the detection electrode 42 can be immersed to a sufficient depth, thereby improving the accuracy of potential detection. For a titration cup with the same or similar upper and lower sizes, it is often necessary to add solvent to increase the liquid level. However, when using the container body of the embodiment of the present application, no solvent needs to be added, or only a small amount of solvent is needed to reach a higher liquid level, thereby reducing the influence of the solvent on the titration test results and improving the accuracy of the test results.

[0068] Combination Figure 5 and Figure 6 As shown, Figure 5 This is one of the data line graphs of the titration test results of some embodiments of the present application. Figure 6This is the second data line graph of the titration test results of some embodiments of the present application. In some embodiments, the sample is an electrolyte, and the HF content in the electrolyte is tested. There are five samples in total, and there are three testing methods, namely manual titration, potentiometric titration with solvent addition, and potentiometric titration without solvent addition. Among them, manual titration can obtain relatively reliable test results through strict experimental operation and correct operating steps, so the test results of manual titration are used as a comparative example.

[0069] Depend on Figure 5 It can be seen that there is an obvious deviation between the test results of manual titration and the test results of potentiometric titration with added solvent, and the test results of potentiometric titration with added solvent are biased. Figure 6 It can be seen that the test results of manual titration are roughly consistent with the test results of potentiometric titration without adding solvent, that is, the results of potentiometric titration without adding solvent are relatively more accurate.

[0070] By providing the container body 11 that is wide at the top and narrow at the bottom, it is convenient to add the sample into the container body 11 and the use of solvent can be reduced, thereby improving the accuracy of the titration test result.

[0071] like Figure 3 As shown, according to some embodiments of the present application, the container body 11 includes a first accommodating portion 111, a connecting portion 112, and a second accommodating portion 113, which are arranged in sequence from bottom to top along the vertical direction F, wherein the inner surface of the connecting portion 112 is a surface inclined along the vertical direction F, and the maximum cross-sectional area of ​​the first accommodating portion 111 along the horizontal direction is smaller than the minimum cross-sectional area of ​​the second accommodating portion 113 along the horizontal direction.

[0072] The opening of the container body 11 is located on the side of the second accommodating portion 113 away from the first accommodating portion 111, and the bottom of the container body 11 is located on the side of the first accommodating portion 111 away from the second accommodating portion 113. After the sample is added to the container body 11, it first enters the second accommodating portion 113 and enters the first accommodating portion 111 under the guidance of the inclined inner surface of the connecting portion 112.

[0073] The horizontal direction is perpendicular to the vertical direction F, the maximum cross-sectional area is the maximum value of the area of ​​the cross section along the horizontal direction, and the minimum cross-sectional area is the minimum value of the area of ​​the cross section along the horizontal direction. The maximum cross-sectional area of ​​the first receiving portion 111 along the horizontal direction is smaller than the minimum cross-sectional area of ​​the second receiving portion 113 along the horizontal direction. It can be understood that the maximum dimension of the first receiving portion 111 along the horizontal direction is smaller than the minimum dimension of the second receiving portion 113 along the horizontal direction. The container body 11 has a structure that is wide at the top and narrow at the bottom, and the connecting portion 112 serves as a transition section between the first receiving portion 111 and the second receiving portion 113.

[0074] The larger second receiving portion 113 has a larger opening to facilitate adding samples into the container body 11. When the sample is loaded into the smaller first receiving portion 111, a higher liquid level can be reached without adding too much sample, so that the detection electrode 42 can be immersed to a sufficient depth, thereby improving the accuracy of potential detection.

[0075] By providing a connecting portion 112 with an inclined inner surface, the sample can be guided into the first receiving portion 111. At the same time, the container body 11 that is wide at the top and narrow at the bottom is convenient for adding the sample into the container body 11 and can ensure that a small amount of sample is added to have a sufficient liquid level height, thereby improving the accuracy of the titration test result.

[0076] According to some embodiments of the present application, a ratio of a maximum cross-sectional area of ​​the first accommodation portion 111 along the horizontal direction to a minimum cross-sectional area of ​​the second accommodation portion 113 along the horizontal direction is greater than or equal to 20% and less than or equal to 80%.

[0077] A ratio of a maximum cross-sectional area of ​​the first accommodation portion 111 along the horizontal direction to a minimum cross-sectional area of ​​the second accommodation portion 113 along the horizontal direction may be 20%, 30%, 40%, 50%, 60%, 70% or 80%.

[0078] By setting the size ratio of the first receiving portion 111 to the second receiving portion 113 within a suitable range, it is possible to facilitate the addition of samples into the container body 11 and ensure that a small amount of sample is added to have a sufficient liquid level height, thereby improving the accuracy of the titration test results.

[0079] like Figure 3 As shown, according to some embodiments of the present application, the potentiometric titration device 100 further includes: a magnetic stirring mechanism 60 , and the magnetic stirring mechanism 60 is used to stir the sample in the container body 11 by magnetic force.

[0080] The principle of the magnetic stirring mechanism 60 is to utilize the principle of like charges repelling and opposite charges attracting in the magnetic field, and utilize the magnetic field to drive the magnetic stirring bar placed in the container body 11 to rotate, that is, to drive the stirring bar to rotate in a non-contact manner, thereby achieving the purpose of stirring the sample, so that the substance to be tested in the sample can fully react with the titrant, thereby improving the accuracy of the titration test. Compared with the stirring method using stirring blades for stirring, the magnetic stirring mechanism 60 is smaller in size and does not require a transmission component, simplifying the structure.

[0081] In some embodiments, the magnetic stirring mechanism 60 is disposed at the titration position P1 to achieve synchronous stirring during the titration process.

[0082] By providing the magnetic stirring mechanism 60 , the need for sample stirring can be met and the overall structure can be simplified.

[0083] like Figure 3 As shown, according to some embodiments of the present application, the magnetic stirring mechanism 60 includes a magnetic stirrer 61 and a magnetic driver 62, the magnetic stirrer 61 is arranged in the container body 11, and the magnetic driver 62 is arranged outside the container body 11, and the magnetic driver 62 is used to drive the magnetic stirrer 61 to rotate.

[0084] The magnetic stirrer 61 is a stirrer with magnetism, and the magnetic driver 62 drives the magnetic stirrer 61 to rotate by continuously changing the direction of the magnetic field, thereby stirring the sample.

[0085] For the method of stirring with stirring blades, it is necessary to configure a titration container with a larger volume, and at the same time, it is necessary to add more samples to make the titration container have a higher liquid level. In order to reach a higher liquid level, a solvent is usually added to the titration container to mix with less sample to increase the volume of the mixture. As described in the above embodiment, the solvent will affect the titration test result. Compared with the stirring blade, the volume of the magnetic stirrer 61 is smaller, and accordingly, the volume of the container body 11 can be reduced, so that the demand for titration can be met without adding more samples, and the use of solvent is also reduced, which improves the accuracy of detection.

[0086] By providing the magnetic stirrer 61 to stir the sample, the volume of the container body 11 can be reduced, while the use of solvent can be reduced, thereby improving the accuracy of detection.

[0087] According to some embodiments of the present application, the magnetic driver 62 is disposed below the droplet position P1 , and the magnetic driver 62 is signal-connected to the controller 50 .

[0088] In some embodiments, after the weighing mechanism 20 completes the weighing of the sample in the container body 11, a magnetic stirrer 61 can be added into the container body 11, and the container body 11 is transported to the dropping position P1 by the conveying mechanism 30. The controller 50 turns on the magnetic driver 62. During the titration of the sample at the dropping position P1, the magnetic driver 62 located below the dropping position P1 drives the magnetic stirrer 61 to rotate, thereby realizing simultaneous titration and stirring.

[0089] By arranging the magnetic drive 62 below the dropping position P1, titration and stirring can be performed synchronously.

[0090] like Figure 2 As shown, according to some embodiments of the present application, the cover-opening position P2 and the cover-closing position P3 are the same position.

[0091] The cover-uncovering position P2 and the cover-closing position P3 are the same position, that is, the cover-uncovering before titration and the cover-closing after titration are completed at the same position. In some embodiments, the conveying mechanism 30 drives the container body 11 to move forward from the cover-uncovering position P2 to the drop position P1 first, and after the titration is completed, drives the container body 11 to move back to the cover-uncovering position P2 for cover-closing.

[0092] By setting the cover-opening position P2 and the cover-closing position P3 to be the same position, only one cover-opening mechanism 70 needs to be provided at the cover-opening position P2 to meet the requirements of cover-opening and cover-closing, thereby simplifying the overall structure.

[0093] According to some embodiments of the present application, the uncovering position P2 is located upstream of the dropping position P1 along the conveying direction of the conveying mechanism 30 , and the covering position P3 is located downstream of the dropping position P1 along the conveying direction of the conveying mechanism 30 .

[0094] The uncovering position P2 is located at the upstream position of the dropping position P1 along the transmission direction of the conveying mechanism 30, and the covering position P3 is located at the downstream position of the dropping position P1 along the transmission direction of the conveying mechanism 30. It can be understood that the uncovering position P2, the dropping position P1 and the covering position P3 are arranged in sequence along the transmission direction.

[0095] By setting the sequentially arranged cover-opening position P2, dropping position P1 and cover-closing position P3, when the previous sample is transported to the dropping position P1 for titration, the next sample can be transported to the cover-opening position P2 to complete the cover-opening; and when the previous sample is transported to the cover-closing position P3 to close the cover, the next sample can be transported to the dropping position P1 for titration, thereby achieving continuous testing of multiple samples in a compact rhythm, thereby improving the efficiency of testing.

[0096] Combination Figure 3 , Figure 7 and Figure 8 As shown, Figure 7 This is a schematic diagram of the structure of the cover-opening mechanism in some embodiments of the present application. Figure 8 This is a schematic diagram of the exploded structure of the cover-lifting mechanism of some embodiments of the present application.

[0097] According to some embodiments of the present application, the cover-opening mechanism 70 includes a driving unit 71 and an adsorption unit 72. The adsorption unit 72 is used to be detachably connected to the cover body 12 in an adsorption manner. The output end of the driving unit 71 is connected to the adsorption unit 72 to drive the adsorption unit 72 to move.

[0098] When the titration container 10 is transported to the uncovering position P2, the driving unit 71 drives the adsorption unit 72 to move toward the side close to the cover 12 until the adsorption unit 72 can adsorb the cover 12. After the adsorption is completed, the driving unit 71 drives the adsorption unit 72 and the cover 12 to move toward the side away from the container body 11, so that the cover 12 is completely separated from the container body 11, thereby completing the uncovering operation. After the titration is completed, the driving unit 71 drives the adsorption unit 72 and the cover 12 to move toward the side close to the container body 11 until the cover 12 is covered on the container body 11, thereby completing the covering operation, and then the adsorption unit 72 is separated from the cover 12, and the driving unit 71 drives the adsorption unit 72 to move toward the side away from the cover 12.

[0099] In some embodiments, the adsorption unit 72 may be adsorbed by magnetic force or by negative pressure.

[0100] In other embodiments, Figure 7 and Figure 8 As shown, the driving unit 71 can be configured as an electromagnetic piston, which is fixed on an operating arm 73. The operating arm 73 is connected to an elevated fixed platform 75 via a height adjustment pin 74. The elevated fixed platform 75 is fixed on a conversion fixed platform 76. The height adjustment pin 74 is adjusted to adjust the adsorption unit 72 to a suitable height position.

[0101] The driving unit 71 for driving the adsorption unit 72 to move is provided to realize the opening and closing operations of the cover body 12 .

[0102] According to some embodiments of the present application, the adsorption unit 72 is a magnetic adsorption head, and the cover-opening mechanism 70 is connected to the controller 50 by signal.

[0103] In some embodiments, the cover 12 has magnetic material, and the magnetic adsorption head can be configured as an electromagnetic adsorption head. When the electromagnetic adsorption head is powered on, the electromagnetic adsorption head generates magnetic force to adsorb the cover 12. When the electromagnetic adsorption head is powered off, the electromagnetic adsorption head loses magnetic force to release the cover 12. The controller 50 can be used to control the power on and off of the electromagnetic adsorption head.

[0104] By providing a magnetic adsorption head, the adsorption unit 72 can adsorb the cover body through magnetic force, and at the same time, the adsorption or release of the cover body 12 is completed under the control of the controller.

[0105] like Figure 1 As shown, according to some embodiments of the present application, the titration mechanism 40 further includes a lifting assembly 43, and an output end of the lifting assembly 43 is connected to the burette 41 and the detection electrode 42 for driving the burette 41 and the detection electrode 42 to move along the vertical direction F.

[0106] After the container body 11 moves to the dropping position P1, the lifting assembly 43 drives the burette 41 and the detection electrode 42 to descend, so that the burette 41 and the detection electrode 42 extend into the container body 11, and the detection electrode 42 is immersed in the sample. After the titration is completed, the lifting assembly 43 drives the burette 41 and the detection electrode 42 to rise, so that the burette 41 and the detection electrode 42 are moved out of the container body 11, so that the conveying mechanism 30 drives the container body 11 to continue to be transported toward the capping position P3.

[0107] In some embodiments, the potentiometric titration device 100 further includes an adding mechanism 80 , which is in communication with the burette 41 , and a controller 50 is signal-connected to the adding mechanism 80 , and the controller 50 is used to control the adding mechanism 80 to deliver titrant to the burette 41 at an appropriate rate.

[0108] By setting up the lifting assembly 43, the burette 41 and the detection electrode 42 are extended into the container body 11 to complete the titration, and after the titration is completed, the burette 41 and the detection electrode 42 are moved out of the container body 11 so that the conveying mechanism 30 can continue to convey the container body 11.

[0109] like Figures 1 to 3 As shown, according to some embodiments of the present application, the conveying mechanism 30 includes a turntable 31 and a rotating assembly 32, the turntable 31 has a plurality of mounting positions P4 arranged around the rotation axis of the turntable 31, the mounting positions P4 are used to hold the titration container 10, and the rotating assembly 32 is transmission-connected to the turntable 31 to drive the mounting positions P4 on the turntable 31 to rotate to the titration position P1 in sequence.

[0110] The turntable 31 may be a circular bearing structure that rotates around the center of the circle, and a plurality of mounting positions P4 are evenly spaced and arranged in the circumferential direction around the rotation axis of the turntable 31. In some embodiments, the mounting position P4 on the turntable 31 is configured as a through hole, and the second receiving portion 113 of the container body 11 may be embedded in the through hole, thereby achieving the fixation of the container body 11 and the turntable 31. The rotating assembly 32 may be configured as a motor, and the motor is used to drive the turntable 31 to rotate, so as to achieve the transmission of the titration container 10.

[0111] By configuring the conveying mechanism 30 as a turntable 31 and a rotating assembly 32 , it is possible to transport the titration container 10 in a rotating manner.

[0112] An embodiment of the second aspect of the present application provides a detection system, including the potentiometric titration device 100 as described in the above embodiment.

[0113] The potentiometric titration device disclosed in the embodiment of the present application can be used for, but is not limited to, titration detection of electrolytes.

[0114] In some embodiments, the detection system may further include a metal impurity element detection device, which is used to detect the concentration of metal impurity elements in the electrolyte. The concentration of metal impurity elements can be used as one of the indicators for evaluating the quality of the electrolyte. By cooperating with the potentiometric titration device, multiple parameters of the electrolyte can be detected, so that the quality of the electrolyte can be more comprehensively evaluated from multiple aspects.

[0115] The detection system in this embodiment can have all the beneficial effects of the above-mentioned potentiometric titration device 100, which will not be described in detail here.

[0116] Combine the following Figures 1 to 8 The embodiments of the present application are described in further detail.

[0117] The potentiometric titration device 100 comprises: a titration container 10 , a weighing mechanism 20 , a conveying mechanism 30 , a titration mechanism 40 , a controller 50 , a magnetic stirring mechanism 60 , a cover-opening mechanism 70 and an adding mechanism 80 .

[0118] The titration container 10 includes a container body 11 and a cover 12. The container body 11 includes a first accommodating portion 111, a connecting portion 112, and a second accommodating portion 113 which are sequentially arranged from bottom to top along a vertical direction F. The diameter of the first accommodating portion 111 is smaller than the diameter of the second accommodating portion 113. The container body 11 is used to hold samples, and the cover 12 is arranged to cover the open opening of the container body 11.

[0119] The weighing mechanism 20 is an electronic balance. First, an empty titration container 10 is placed on the electronic balance and the electronic balance is reset to zero. Then, a sample is added into the titration container 10 to obtain the weight of the sample in the titration container 10 .

[0120] The conveying mechanism 30 includes a turntable 31 and a rotating assembly 32. A plurality of mounting positions P4 are arranged on the turntable 31 around the rotation axis. The mounting position P4 is constructed as a through hole for placing the container body 11. The rotating assembly 32 is used to drive the turntable 31 to rotate, thereby conveying the container body 11 to the uncovering position P2, the dropping position P1 and the capping position P3 in sequence, wherein the uncovering position P2 and the capping position P3 are the same position.

[0121] The titration mechanism 40 is arranged at the dropping position P1, and includes a burette 41, a detection electrode 42 and a lifting assembly 43. The burette 41 is used to add titrant into the titration container 10 located at the dropping position P1, the detection electrode 42 is used to detect the potential of the sample in the titration container 10, and the lifting assembly 43 is used to drive the burette 41 and the detection electrode 42 to rise and fall in the vertical direction F.

[0122] The magnetic stirring mechanism 60 includes a magnetic stirrer 61 and a magnetic driver 62 . The magnetic stirrer 61 is disposed in the container body 11 , and the magnetic driver 62 is disposed at the lower side of the drop position. The magnetic driver 62 is used to drive the magnetic stirrer 61 to rotate.

[0123] The cover-opening mechanism 70 is arranged at the cover-opening position P2, and includes a conversion fixing platform 76, an increasing fixing platform 75, a height adjustment pin 74, an operating arm 73, an electromagnetic piston and a magnetic adsorption head which are connected in sequence. The electromagnetic piston drives the magnetic adsorption head to rise and fall, and the magnetic adsorption head adsorbs or releases the cover body 12.

[0124] The adding mechanism 80 is used to deliver the titrant to the burette 41 under the control of the controller 50. The controller 50 is also used to connect the weighing mechanism 20, the conveying mechanism 30, the titration mechanism 40, the magnetic stirring mechanism 60 and the cover-opening mechanism 70 by signals.

[0125] The process of using the potentiometric titration device of the embodiment of the present application to detect the HF content in the electrolyte is as follows: first, place the empty container body 11 on the electronic balance and return the electronic balance to zero, then add a certain amount of electrolyte sample into the container body 11 to obtain the weight of the electrolyte sample in the container body 11, and record the weight through the controller, add the magnetic stirrer 61 into the container body 11, cover the open mouth of the container body 11 with the cover body 12, place the container body 11 on the installation position P4 of the turntable 31, transport the container body 11 to the cover opening position P2 by the turntable 31, and use the cover opening mechanism 70 to absorb the cover body 12 by magnetic force so that the cover body 12 and the container body 11 are in contact with each other. The container body 11 is separated, and the turntable 31 drives the container body 11 to continue to rotate to the drop position P1, and then the magnetic driver 62 drives the magnetic stirrer 61 to stir the electrolyte sample, and the lifting component 43 drives the burette 41 and the detection electrode 42 to descend into the container body 11 for titration. After the titration is terminated, the lifting component 43 drives the burette 41 and the detection electrode 42 to rise to the outside of the container body 11, and the turntable 31 rotates in the opposite direction to drive the container body 11 back to the cover opening position P2, and the cover 12 is released by the cover opening mechanism 70, so that the cover 12 is covered on the container body 11 again, and the controller 50 calculates the HF content, thereby completing the titration detection of the sample. After that, the turntable 31 continues to repeat the above operation to titrate the next electrolyte sample until all electrolyte samples are titrated.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A potentiometric titration device, characterized in that: include: A titration container, comprising a container body and a cover body detachably connected to the container body, wherein the container body is used to hold a sample; A weighing mechanism, used for weighing the weight of the sample; A conveying mechanism, used for conveying the titration container containing the sample to the titration position; A titration mechanism, comprising a burette and a detection electrode, wherein the burette is used to add a titrant into a titration container located at the titration position; The detection electrode is used to detect the potential of the sample in the titration container; A controller, connected to the weighing mechanism, the conveying mechanism and the titration mechanism by signals respectively; The cover-opening mechanism is configured to separate the cover body from the container body at a cover-opening position offset from the dropping position, and to cover the cover body onto the container body at a cover-closing position offset from the dropping position.

2. The potentiometric titration device according to claim 1, characterized in that: The horizontal dimension of the middle longitudinal section of the container body gradually decreases from top to bottom along the vertical direction.

3. The potentiometric titration device according to claim 1, characterized in that: The container body comprises a first accommodating portion, a connecting portion and a second accommodating portion which are arranged in sequence from bottom to top along the vertical direction; The inner surface of the connecting portion is a surface inclined in the vertical direction, and the maximum cross-sectional area of ​​the first accommodating portion in the horizontal direction is smaller than the minimum cross-sectional area of ​​the second accommodating portion in the horizontal direction.

4. The potentiometric titration device according to claim 3, characterized in that: A ratio of a maximum cross-sectional area of ​​the first accommodation portion along a horizontal direction to a minimum cross-sectional area of ​​the second accommodation portion along a horizontal direction is greater than or equal to 20% and less than or equal to 80%.

5. The potentiometric titration device according to any one of claims 1 to 4, characterized in that: The potentiometric titration device further comprises: a magnetic stirring mechanism; The magnetic stirring mechanism is used to stir the sample in the container body by magnetic force.

6. The potentiometric titration device according to claim 5, characterized in that: The magnetic stirring mechanism comprises a magnetic stirring bar and a magnetic driver; The magnetic stirrer is arranged in the container body, the magnetic driver is arranged outside the container body, and the magnetic driver is used to drive the magnetic stirrer to rotate.

7. The potentiometric titration device according to claim 6, characterized in that: The magnetic driver is disposed below the drop position, and the magnetic driver is connected to the controller signal.

8. The potentiometric titration device according to any one of claims 1 to 4, characterized in that: The cover-opening position and the cover-closing position are the same position.

9. The potentiometric titration device according to any one of claims 1 to 4, characterized in that: The uncovering position is located at an upstream position of the dropping position along the conveying direction of the conveying mechanism, and the covering position is located at a downstream position of the dropping position along the conveying direction of the conveying mechanism.

10. The potentiometric titration device according to any one of claims 1 to 4, characterized in that: The cover-lifting mechanism comprises a driving unit and an adsorption unit; The adsorption unit is used to be detachably connected to the cover body in an adsorption manner, and the output end of the driving unit is connected to the adsorption unit to drive the adsorption unit to move.

11. The potentiometric titration device according to claim 10, characterized in that: The adsorption unit is a magnetic adsorption head, and the cover-opening mechanism is connected to the controller signal.

12. The potentiometric titration device according to any one of claims 1 to 4, characterized in that: The titration mechanism further comprises a lifting component, the output end of which is connected to the burette and the detection electrode so as to drive the burette and the detection electrode to move in a vertical direction.

13. The potentiometric titration device according to any one of claims 1 to 4, characterized in that: The conveying mechanism comprises: A turntable having a plurality of mounting positions arranged around a rotation axis of the turntable, wherein the mounting positions are used to hold the titration container; The rotating assembly is connected to the turntable in a transmission manner to drive the mounting positions on the turntable to rotate to the dropping positions in sequence.

14. A detection system, characterized in that: Comprising a potentiometric titration device as described in any one of claims 1-13.

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