Acidity detection device for battery electrolyte

Abstract

The utility model relates to an acidity detection device for a battery electrolyte. Relates to the technical field of battery detection. The device specifically comprises a detection container for detecting the acidity of the electrolyte, a gas conveying assembly for conveying inert gas to the detection container, a first liquid conveying assembly for conveying the to-be-detected electrolyte to the detection container, and a second liquid conveying assembly for conveying a standard solution to the detection container, the heat preservation assembly is used for keeping the detection container in a low-temperature atmosphere; an exhaust port is formed in the top of the detection container and is used for exhausting air in the detection container or adding an indicator into the detection container, and the detection container is made of a transparent material. According to the device, the gas transmission component and the heat preservation component are arranged, so that when the acidity of the electrolyte of the battery is detected, the acidity test in the detection container can be carried out in a low-temperature and low-humidity environment, and therefore, the application range of the testing device for detecting the acidity of the electrolyte is wider, and the accuracy of a detection result is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of battery detection, in particular to an acidity detection device for battery electrolyte. Background Art

[0002] With the development of energy technology, the performance requirements of secondary batteries are getting higher and higher. The electrolyte, as the main material, has a significant impact on battery performance. Among the physical properties of the electrolyte, the free acid content (measured in HF) is an important standard, which has a significant impact on the battery's cycle, safety, storage and other performance. Therefore, in the production process of the battery, the acidity detection of the electrolyte is the key to ensuring the battery performance.

[0003] There are currently two commonly used methods for testing electrolyte acidity: potentiometric titration and ice water titration. The current test instrument used for potentiometric titration is expensive and complex to maintain. When the moisture in the environment is not controlled, some electrolytes will produce acid due to hydrolysis, and the titrator will not be able to identify the titration endpoint, resulting in a large test value. Solving the problem of moisture control will further increase the test cost, so the economic applicability is low. The test device used for ice water titration uses an ice-water mixture as a solvent. For some electrolytes containing special additives, they will quickly hydrolyze to produce acid in the presence of water. The indicator changes color and then quickly reverses color, making it difficult to determine the test endpoint, so its scope of application is limited. Utility Model Content

[0004] The purpose of the utility model is to provide a battery electrolyte acidity detection device to address the deficiencies of the above-mentioned prior art, which can make the battery electrolyte acidity detection simple and convenient, easy to implement, and reduce the test cost, and can also expand the application scope of the electrolyte acidity detection and ensure the accuracy of the test results.

[0005] The utility model provides a battery electrolyte acidity detection device, comprising a detection container for detecting the acidity of the electrolyte, a gas delivery component for delivering an inert gas to the detection container, a first infusion component for delivering the electrolyte to be detected to the detection container, a second infusion component for delivering a standard solution to the detection container, and a heat preservation component for keeping the detection container at a low temperature; an exhaust port is provided on the top of the detection container, the exhaust port is used to exhaust the air in the detection container, or to add an indicator into the detection container, and the detection container is made of a transparent material.

[0006] Furthermore, the detection container includes a detection bottle body with a cavity therein, and a cover detachably connected to the detection bottle body, the top of the cavity is provided with an opening, the cover seals the opening, and the exhaust port is provided on the cover.

[0007] Further, a ventilation pipe is provided on the cover, the ventilation pipe communicates the cavity with the outside, the gas transmission assembly includes a gas tank for storing inert gas, and a gas transmission pipe connecting the gas tank and the ventilation pipe.

[0008] Further, a liquid transmission pipe is provided on the cover, the liquid transmission pipe communicates the cavity with the outside, the first liquid infusion assembly includes a liquid storage tank for storing the electrolyte to be detected, a first liquid infusion pipe connecting the liquid storage tank and the liquid transmission pipe, and a power pump provided on the first liquid infusion pipe.

[0009] Further, an infusion port is provided on the cover, the second liquid infusion assembly includes a sampler for loading a standard solution, and a second liquid infusion pipe with one end communicating with the sampler and the other end inserted into the infusion port, and the second liquid infusion pipe is a flexible pipe.

[0010] Further, the sampler includes a liquid loading cavity for accommodating the standard solution, an infusion connector for communicating the liquid loading cavity with the outside, and a driving member for changing the volume of the liquid loading cavity. The infusion connector is used to convey the standard solution to the liquid loading cavity, and one end of the second liquid infusion pipe communicates with the liquid loading cavity.

[0011] Further, the driving member includes a piston provided in the liquid loading cavity and a push rod connected to the piston. The piston is slidably connected to the inner wall of the liquid loading cavity, and the push rod pushes the piston to move axially in the liquid loading cavity.

[0012] Further, the heat preservation assembly includes a water tank for loading ice-water mixture, and an insertion port is provided at the top of the water tank for the detection bottle body to be inserted.

[0013] Further, a limiting block is provided on the outer periphery of the detection bottle body, a limiting slideway matching with the limiting block is provided on the outer periphery of the insertion port, and a slideway opening communicating with the limiting slideway is provided. The slideway opening is used for the limiting block to enter and exit the limiting slideway.

[0014] Further, the detection device further includes a magnetic stirrer provided below the detection container and a stirring magnetic bead provided in the detection container. The magnetic stirrer is used to drive the stirring magnetic bead to rotate, and the stirring magnetic bead is used to stir the solution in the detection container.

[0015] The acidity detection device for a battery electrolyte of the present utility model has the following beneficial effects:

[0016] (1) The gas transmission component and the heat preservation component are provided in this detection device. When detecting the acidity of the electrolyte of the battery, the acidity test in the detection container can be carried out in a low-temperature and low-humidity environment, so that the applicable range of this test device for detecting the acidity of the electrolyte of the battery is wider, and the accuracy of the detection result is ensured;

[0017] (2) The detection container of this detection device includes a detection bottle body and a cover. A cavity is provided in the detection bottle body, and an opening is provided at the top of the cavity. The opening at the top of the cavity is closed by the cover, so as to prevent the solution in the cavity from being directly exposed to the air, and better avoid the situation where the solution in the cavity interacts with the components of the air;

[0018] (3) The gas transmission component of this detection device includes a gas tank and a gas transmission pipe. When detecting the acidity of the battery electrolyte, only need to connect the gas transmission pipe with the ventilation pipe, then the inert gas stored in the gas tank can be input into the cavity of the detection bottle body through the gas transmission pipe and the ventilation pipe, and the air in the cavity is discharged through the exhaust port, so that the use of this test device is simpler and more convenient, and is easy to implement;

[0019] (4) The second liquid infusion component of this detection device includes a sampler and a second liquid infusion pipe. An infusion port is also provided on the cover. The second liquid infusion pipe is inserted into the infusion port to connect the sampler with the cavity of the detection bottle body, so that the standard solution output by the sampler is input into the cavity of the detection bottle body after flowing through the second liquid infusion pipe, completing the transmission of the standard solution, so that the use of this test device is simpler and more convenient, and is easy to implement;

[0020] (5) The sampler of this detection device includes a liquid loading cavity, an infusion joint and a driving part. The standard solution is transported into the liquid loading cavity through the infusion joint. The volume of the liquid loading cavity is compressed by the driving part, so that the standard solution in the liquid loading cavity flows out and flows into the cavity of the detection bottle body through the second liquid infusion pipe, completing the transmission of the standard solution, so that the use of this test device is simpler and more convenient, and is easy to implement;

[0021] (6) A limiting block is provided on the outer periphery of the detection bottle body of this detection device. A limiting slideway matched with the limiting block and a slideway opening communicated with the limiting slideway are provided on the outer periphery of the insertion interface. The slideway opening is used for the limiting block to enter and exit the limiting slideway. Through the cooperation of the limiting slideway and the limiting block, the movement of the detection bottle body in the vertical direction is limited, so as to ensure that the ice-water mixture is in full contact with the detection bottle body, and further ensure the heat preservation effect of the heat preservation component on the detection bottle body. Description of the Drawings

[0022] The drawings incorporated into the specification and constituting a part of the specification illustrate the embodiments of the present invention and, together with the description, are used to explain the principles of the present invention. In these drawings, like reference numerals are used to represent like elements.

[0023] Figure 1 The structural schematic diagram of an acidity detection device for a battery electrolyte according to an embodiment of the present utility model;

[0024] Figure 2 The exploded view of the connection between the cover and the detection bottle body of an acidity detection device for a battery electrolyte according to an embodiment of the present utility model;

[0025] Figure 3 The structural schematic diagram of a sampler of an acidity detection device for a battery electrolyte according to an embodiment of the present utility model;

[0026] Figure 4 The structural schematic diagram of a water tank of an acidity detection device for a battery electrolyte according to an embodiment of the present utility model.

[0027] In the figure: 1. Detection container; 11. Detection bottle body; 111. Cavity; 112. Limiting block; 12. Cover; 121. Exhaust port; 122. Vent pipe; 123. Liquid delivery pipe; 124. Liquid infusion port; 2. Gas cylinder; 3. Gas transmission pipe; 4. Liquid storage tank; 5. First liquid infusion pipe; 6. Power pump; 7. Sampler; 71. Liquid filling cavity; 72. Liquid infusion joint; 73. Piston; 74. Push rod; 8. Second liquid infusion pipe; 9. Water tank; 91. Insertion interface; 92. Limiting slideway; 93. Slideway opening; 10. Magnetic stirrer; 101. Stirring magnetic particle; 102. Base; 103. Support; 104. Timer. Specific embodiments

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present utility model.

[0029] Please refer to Figures 1 to 4 , an acidity detection device for a battery electrolyte according to an embodiment of the present utility model, includes a detection container 1 for detecting the acidity of the electrolyte, a gas transmission assembly for delivering inert gas to the detection container 1, a first liquid infusion assembly for delivering the electrolyte to be detected to the detection container 1, a second liquid infusion assembly for delivering a standard solution to the detection container 1, and a heat preservation assembly for maintaining a low-temperature atmosphere in the detection container 1; an exhaust port 121 is provided at the top of the detection container 1, and the exhaust port 121 is used to discharge the air in the detection container 1 or to add an indicator to the detection container 1, and the detection container 1 is made of a transparent material.

[0030] In this patent, the battery electrolyte is the electrolyte of a primary battery or a secondary battery. The detection device includes a detection container 1, a gas delivery assembly, a first liquid delivery assembly, a second liquid delivery assembly, and a heat preservation assembly. When performing the acidity detection of the battery electrolyte, first, an inert gas is delivered into the detection container 1 through the gas delivery assembly. There is an exhaust port 121 at the top of the detection container 1. Since the density of the inert gas is greater than that of air, when the inert gas fills the detection container 1, the air in the detection container 1 will be discharged through the exhaust port 121, so as to maintain a low-humidity atmosphere environment in the detection container 1.

[0031] Then, the electrolyte to be detected is delivered into the detection container 1 through the first liquid delivery assembly, so as to prevent the electrolyte to be detected input into the detection container 1 from contacting with air, and the moisture in the air causes the electrolyte to rapidly hydrolyze to generate acid, affecting the acidity test result of the battery electrolyte.

[0032] In this patent, after the gas delivery assembly quickly delivers the inert gas into the detection container 1 and discharges the air in the detection container 1, the gas delivery assembly can be disconnected to stop delivering the inert gas to the detection container 1, or low-flow continuous ventilation can be adopted to ensure the stability of the low-air-content environment in the detection container 1. Specifically, in actual implementation, it can be determined according to the actual detection situation.

[0033] After a fixed amount of the electrolyte to be detected is input into the detection container 1, an indicator is dropped into the detection container 1 through the exhaust port 121 at the top of the detection container 1; after the indicator in the detection container 1 fully reacts with the electrolyte to be detected, a standard solution is input into the detection container 1 through the second liquid delivery assembly, and the color of the solution in the detection container 1 is observed. When the color of the detection solution undergoes an obvious mutation, the second liquid delivery assembly stops inputting the standard solution into the detection container 1, and the volume of the input standard solution is recorded, thus completing the acidity detection of the battery electrolyte.

[0034] Since the electrolyte contains a special additive that is prone to hydrolysis, it will react rapidly with the moisture in the air to generate acid, and the higher the temperature, the faster the reaction, resulting in difficulty in determining the test end point and affecting the accuracy of the test result. Therefore, in the test device, a heat preservation assembly is also provided. During the process of performing the acidity detection of the battery electrolyte, the heat preservation assembly keeps a low-temperature atmosphere environment inside the detection container 1, thereby reducing the generation of acid and ensuring the accuracy of the test result.

[0035] Specifically, in this patent, the indicator can be bromothymol blue indicator; the standard solution can be prepared by mixing purified triethylamine solvent and carbonate solvent (water content < 10 ppm) to obtain a standard triethylamine solution with a certain concentration. Therefore, in the acidity detection of the battery electrolyte, the standard triethylamine solution serves not only as the titrant of the electrolyte but also as the solvent of the electrolyte. When the indicator is mixed with the electrolyte to be detected, the standard solution is input into the detection container 1 through the second infusion component until the solution in the detection container 1 turns blue, thus completing the acidity detection of the battery electrolyte.

[0036] To facilitate observing the color change in the detection container 1, in this patent, the detection container 1 is made of a transparent material, such as glass. It can be foreseen that: the indicator in this patent is not limited to bromothymol blue indicator, and the standard solution is not limited to the triethylamine standard solution either. Other indicators and standard solutions that can produce color reactions can also be used. Specifically, they can be selected according to the actual test requirements.

[0037] Specifically, when testing the acidity of the battery electrolyte with this testing device, the content of free acid (HF) in the electrolyte can be calculated according to the formula: X = C * V * M * 1000 / m. Where X is the test result, that is, the content of free acid (HF) in the electrolyte, with the unit of mg / Kg; C is the concentration of the standard solution, with the unit of mol / L; V is the volume of the standard solution input into the detection container 1, with the unit of mL; M is the molar mass of the free acid, with the unit of g / mol (generally 20.01 g / mol); m is the mass of the electrolyte to be detected input into the detection container 1, with the unit of g.

[0038] Since the standard solution in this patent uses a standard solution with a low water content, and the standard solution serves not only as the titrant of the electrolyte but also as the solvent of the electrolyte. At the same time, the gas transmission component and the heat preservation component in this testing device can keep the atmosphere environment in the detection container 1 at low temperature and low humidity, so that the acidity test in the detection container 1 is carried out in a low-temperature and low-humidity environment.

[0039] Compared with the existing testing device for detecting the acidity of the electrolyte using the potentiometric titration method, the testing instrument is more expensive, the overall maintenance is complex, and it is more difficult to control the moisture. The overall structure of the testing device in this patent is simpler, the implementation cost is lower, and the control of moisture is also easier to achieve, thus being able to reduce the test cost and having stronger economic applicability.

[0040] Compared with the existing test device for detecting the acidity of the electrolyte using the ice water titration method, which uses ice water mixture as the solvent of the electrolyte, for some electrolytes containing special additives, they will rapidly hydrolyze to form acids in the presence of water, resulting in the rapid reverse coloration of the indicator after color change, making it difficult to determine the test end point. By using this test device to detect the acidity of the electrolyte, the acidity test in the detection container 1 can be carried out in a low-temperature and low-humidity environment, thus making the applicable range of this test device for detecting the acidity of the electrolyte wider and ensuring the accuracy of the detection results.

[0041] In this embodiment, the detection container 1 includes a detection bottle body 11 and a cover 12. A cavity 111 is provided in the detection bottle body 11 for accommodating the electrolyte, the indicator, and the standard solution, so that the acidity detection of the battery electrolyte is carried out in the cavity 111 of the detection bottle body 11.

[0042] An opening is provided at the top of the cavity 111, and the cover 12 is detachably connected to the detection bottle body 11. When detecting the acidity of the battery electrolyte, when the cover 12 is fixedly connected to the detection bottle body 11, the cover 12 closes the opening at the top of the cavity 111, thereby preventing the solution in the cavity 111 from being directly exposed to the air and better avoiding the interaction between the solution in the cavity 111 and the components of the air.

[0043] After the acidity detection of the battery electrolyte is completed, the cover 12 can be detached from the detection bottle body 11 to open the opening at the top of the cavity 111, which is convenient for cleaning the cavity 111 in the detection bottle body 11, and thus makes the use of this test device simpler, more convenient, and more practical.

[0044] Specifically, in actual implementation, the cover 12 includes a rotating part and a screwing part vertically extending on the rotating part. An external thread is provided on the screwing part, and an internal thread is provided on the inner wall of the detection bottle body 11. By rotating the rotating part, the external thread of the screwing part is screwed with the internal thread on the inner wall of the detection bottle body 11 until the screwing part is inserted into the cavity 111 and the rotating part abuts against the top of the detection bottle body 11, thereby realizing the fixed connection between the cover 12 and the detection bottle body 11. By setting the cover 12 in this structure, not only can the cover 12 better close the cavity 111 in the detection bottle body 11, but also the detachable connection between the cover 12 and the detection bottle body 11 is simpler, more convenient, and easier to implement.

[0045] The exhaust port 121 is provided on the cover 12. When detecting the acidity of the battery electrolyte, the cover 12 is fixedly connected to the detection bottle body 11 to seal the opening at the top of the cavity 111, and the exhaust port 121 communicates the cavity 111 with the outside. When the gas transmission component inputs inert gas into the cavity 111 of the detection bottle body 11, the air in the cavity 111 is discharged through the exhaust port 121; when adding the indicator, the indicator can be dropped into the cavity 111 from the exhaust port 121 through a dropper.

[0046] In actual implementation, since the addition of the indicator is carried out after the air in the cavity 111 is discharged, when adding the indicator through a dropper, the dropper can be inserted into the exhaust port 121, and during the electrolyte acidity test, the dropper remains inserted in the exhaust port 121, so that the dropper seals the exhaust port 121 to prevent the solution in the cavity 111 from being directly exposed to the air; in addition, even if the dropper is immediately withdrawn from the exhaust port 121 after the indicator addition is completed, the gas transmission component can also continuously ventilate the cavity 111 at a low flow rate to prevent air from entering the cavity 111 through the open exhaust port 121.

[0047] In this embodiment, a ventilation pipe 122 is provided on the cover 12. When the cover 12 is fixedly connected to the detection bottle body 11, the ventilation pipe 122 communicates the cavity 111 with the outside. The gas transmission component includes a gas cylinder 2 and a gas transmission pipe 3. When detecting the acidity of the battery electrolyte, only need to connect the gas transmission pipe 3 to the ventilation pipe 122, then the inert gas stored in the gas cylinder 2 can be input into the cavity 111 of the detection bottle body 11 through the gas transmission pipe 3 and the ventilation pipe 122, and the air in the cavity 111 is discharged through the exhaust port 121.

[0048] Specifically, in actual implementation, when the cover 12 is fixedly connected to the detection bottle body 11, the end of the ventilation pipe 122 extending into the cavity 111 can extend to the bottom of the cavity 111. The gas cylinder 2 can be an argon gas cylinder for storing argon. Argon gas is input into the bottom of the cavity 111 of the detection bottle body 11 through the gas transmission pipe 3 and the ventilation pipe 122. Since the density of argon is greater than that of air, the argon gas introduced into the cavity 111 will gradually discharge the air in the cavity 111 from bottom to top through the exhaust port 121 at the top of the cavity 111, so that the discharge of the air in the cavity 111 is more thorough, further ensuring the accuracy of the test results.

[0049] In this embodiment, a liquid delivery pipe 123 is provided on the cover 12. When the cover 12 is fixedly connected to the detection bottle body 11, the liquid delivery pipe 123 communicates the cavity 111 with the outside. The first liquid delivery component includes a liquid storage tank 4, a first liquid delivery pipe 5 and a power pump 6. When detecting the acidity of the battery electrolyte, the first liquid delivery pipe 5 is connected to the liquid delivery pipe 123, so that the liquid storage tank 4 is communicated with the liquid delivery pipe 123 through the first liquid delivery pipe 5.

[0050] A power pump 6 is arranged on the first infusion tube 5. When the power pump 6 is started, the electrolyte to be detected stored in the liquid storage tank 4 is driven to sequentially pass through the first infusion tube 5 and the liquid passing tube 123 and be input into the cavity 111 of the detection bottle body 11, realizing the transportation of the electrolyte to be detected, thereby making the use of this test device simpler and more convenient and easier to implement.

[0051] In this embodiment, an infusion port 124 is further arranged on the sealing cover 12. When the sealing cover 12 is fixedly connected to the detection bottle body 11, the infusion port 124 communicates the cavity 111 of the detection bottle body 11 with the outside. The second infusion assembly includes a sampler 7 and a second infusion tube 8. A standard solution is loaded in the sampler 7, and one end of the second infusion tube 8 is connected to the sampler 7.

[0052] When detecting the acidity of the battery electrolyte, the other end of the second infusion tube 8 is inserted into the infusion port 124, so that the sampler 7 is communicated with the cavity 111 of the detection bottle body 11 through the second infusion tube 8. The standard solution output by the sampler 7 flows through the second infusion tube 8 and then is input into the cavity 111 of the detection bottle body 11, completing the transportation of the standard solution.

[0053] In this patent, the second infusion tube 8 is set as a flexible tube, so that the insertion of the second infusion tube 8 into the infusion port 124 is not restricted by the positions of the sampler 7 and the infusion port 124, and further makes the use of this test device simpler and more convenient and easier to implement. Specifically, this test device further includes a base 102 and a bracket 103 vertically arranged on the base 102. The sampler 7 is fixed by the bracket 103 and is erected above the detection bottle body 11, so that the transportation of the standard solution from the sampler 7 to the detection bottle body 11 is more easily realized.

[0054] In this embodiment, the sampler 7 includes a liquid loading cavity 71, an infusion joint 72 and a driving member. The infusion joint 72 communicates the liquid loading cavity 71 with the outside, so that an external infusion pipeline is connected through the infusion joint 72 to transport the standard solution into the liquid loading cavity 71.

[0055] When the driving member is started, it can change the volume of the liquid loading cavity 71. One end of the second infusion tube 8 is communicated with the liquid loading cavity 71. When the liquid loading cavity 71 is filled with the standard solution, the driving member compresses the volume of the liquid loading cavity 71, so that the standard solution in the liquid loading cavity 71 flows out and flows into the cavity 111 of the detection bottle body 11 through the second infusion tube 8, completing the transportation of the standard solution.

[0056] When a significant color change occurs in the solution in the bottle body 11, the driving member stops compressing the volume of the liquid filling cavity 71, so that the standard solution in the liquid filling cavity 71 no longer flows out, thereby stopping the delivery of the standard solution; after the acidity detection of the battery electrolyte is completed, the driving member expands the volume of the liquid filling cavity 71, so that the external infusion pipeline can deliver the standard solution into the liquid filling cavity 71 for loading the standard solution in the next test task.

[0057] Specifically, in this embodiment, the driving member includes a piston 73 and a push rod 74. The piston 73 is arranged in the liquid filling cavity 71 and is slidably connected to the inner wall of the liquid filling cavity 71. The push rod 74 is connected to the piston 73, so as to push the piston 73 to move in the liquid filling cavity 71 through the push rod 74, so that the piston 73 compresses or expands the volume of the liquid filling cavity 71.

[0058] As mentioned above, this test device further includes a base 102 and a bracket 103. The bracket 103 fixes the sampler 7 so that the sampler 7 is erected above the test bottle body 11. Specifically, the bracket 103 horizontally installs the sampler 7 above the test bottle body 11. It can be foreseen that: the second infusion tube 8 is communicated with one end of the liquid filling cavity 71, and the push rod 74 is arranged at the other end of the liquid filling cavity 71.

[0059] When the push rod 74 pushes the piston 73 to move horizontally in the liquid filling cavity 71 in the direction close to the second infusion tube 8, the piston 73 compresses the volume of the liquid filling cavity 71, so that the standard solution in the liquid filling cavity 71 is output and is delivered to the cavity 111 of the test bottle body 11 through the second infusion tube 8; when the push rod 74 pushes the piston 73 to move horizontally in the liquid filling cavity 71 in the direction away from the second infusion tube 8, the piston 73 expands the volume of the liquid filling cavity 71, so as to facilitate the loading of the standard solution in the liquid filling cavity 71 in the next test task.

[0060] As mentioned in the previous embodiment, when testing the acidity of the battery electrolyte with this test device, the content of free acid (HF) in the electrolyte can be calculated according to the formula: X = C * V * M * 1000 / m. In this embodiment, when the push rod 74 pushes the piston 73 to compress the liquid filling cavity 71 in the liquid filling cavity 71, the stroke of the piston 73 in the liquid filling cavity 71 is positively correlated with the output volume of the standard solution in the liquid filling cavity 71.

[0061] Therefore, according to the moving stroke of the piston 73 in the liquid filling cavity 71 per unit time, the output volume V1 of the standard solution per unit time can be obtained, and the unit is mL / s. This test device further includes a timer 104. By controlling and displaying the moving time t of the piston 73 through the timer 104, with the unit being s, the volume V of the standard solution input into the test container 1 can be obtained according to V = V1 * t, so that the operation of detecting the acidity of the electrolyte is more simple and convenient and easy to implement.

[0062] In this embodiment, the heat preservation component is a water tank 9 filled with ice-water mixture, and an insertion port 91 is provided at the top of the water tank 9. When detecting the acidity of the battery electrolyte, the bottom of the detection bottle 11 can be inserted into the water tank 9 through the insertion port 91, so that the ice-water mixture in the water tank 9 is located outside the bottom of the detection bottle 11, and then the cavity 111 of the detection bottle 11 is maintained in a low-temperature atmosphere environment through the ice-water mixture.

[0063] Further, in this embodiment, a limiting slideway 92 is provided on the outer periphery of the insertion port 91, and a slideway opening 93 communicating with the limiting slideway 92. A limiting block 112 is provided on the outer periphery of the detection bottle 11. When the bottom of the detection bottle 11 is inserted into the water tank 9 through the insertion port 91, the limiting block 112 on the outer periphery of the detection bottle 11 can cooperate with the slideway opening 93, and then by rotating the detection bottle 11, the limiting block 112 enters the limiting slideway 92 through the slideway opening 93. The upper and lower side walls of the limiting slideway 92 limit the limiting block 112, so as to limit the movement of the detection bottle 11 in the vertical direction.

[0064] The reason for such setting is that during the process of detecting the acidity of the electrolyte, the ice-water mixture in the water tank 9 will cause the liquid in the water tank 9 to increase due to the melting of ice, and then cause the detection bottle 11 inserted into the water tank 9 to float, affecting the heat preservation effect of the ice-water mixture on the detection bottle 11.

[0065] Therefore, in this patent, through the cooperation of the limiting slideway 92 and the limiting block 112, when the bottom of the detection bottle 11 is inserted into the water tank 9, the movement of the detection bottle 11 in the vertical direction is limited, so as to ensure sufficient contact between the ice-water mixture and the detection bottle 11, and further ensure the heat preservation effect of the heat preservation component on the detection bottle 11.

[0066] After the acidity test of the battery electrolyte is completed, the detection bottle 11 can be rotated reversely, so that the limiting block 112 moves along the limiting slideway 92 to the slideway opening 93, and then the limiting block 112 is moved out of the limiting slideway 92 through the slideway opening 93, so that the detection bottle 11 can be withdrawn from the insertion port 91 of the water tank 9, realizing the separation of the detection bottle 11 from the water tank 9, and then the ice-water mixture in the water tank 9 can be replaced through the insertion port 91.

[0067] In this embodiment, the detection device further includes a magnetic stirrer 10 and a stirring magnetic bar 101. The magnetic stirrer 10 is arranged below the detection container 1, and the stirring magnetic bar 101 is arranged in the detection container 1. Specifically, the magnetic stirrer 10 is arranged on the base 102, the water tank 9 is arranged on the magnetic stirrer 10, the bottom of the detection bottle 11 is inserted into the water tank 9, and the stirring magnetic bar 101 is arranged in the detection bottle 11.

[0068] When the magnetic stirrer 10 is started, it drives the stirring magnet 101 in the detection bottle body 11 to rotate, thereby stirring the solution in the detection bottle body 11 through the stirring magnet 101, enabling the indicator in the detection bottle body 11 to fully mix and react with the electrolyte to be detected, and thus ensuring the accuracy of the test results of this test device.

[0069] The content described above can be implemented alone or in various combinations, and these variant ways are all within the protection scope of the present utility model.

[0070] It should be noted that in this article, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device comprising the element.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it. Although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model.

Claims

1. A battery electrolyte acidity detection device, characterized in that: The invention comprises a detection container (1) for testing the acidity of an electrolyte, a gas supply component for supplying an inert gas to the detection container (1), a first infusion component for supplying an electrolyte to be tested to the detection container (1), a second infusion component for supplying a standard solution to the detection container (1), and a heat preservation component for maintaining a low-temperature atmosphere in the detection container (1); an exhaust port (121) is provided at the top of the detection container (1); the exhaust port (121) is used to exhaust air in the detection container (1) or to add an indicator into the detection container (1); and the detection container (1) is made of a transparent material.

2. A battery electrolyte acidity detection device as claimed in claim 1, characterized in that: The detection container (1) comprises a detection bottle body (11) having a cavity (111) therein, and a cover (12) detachably connected to the detection bottle body (11); an opening is provided at the top of the cavity (111); the cover (12) seals the opening; and the exhaust port (121) is provided on the cover (12).

3. A battery electrolyte acidity detection device as claimed in claim 2, characterized in that: The sealing cover (12) is provided with a vent pipe (122), the vent pipe (122) connecting the cavity (111) with the outside, and the gas delivery assembly comprises a gas tank (2) for storing inert gas, and a gas delivery pipe (3) connecting the gas tank (2) and the vent pipe (122).

4. A battery electrolyte acidity detection device as claimed in claim 2, characterized in that: The cover (12) is provided with a liquid passage (123), the liquid passage (123) connecting the cavity (111) with the outside, and the first infusion assembly comprises a liquid storage tank (4) for storing an electrolyte to be detected, a first infusion tube (5) connecting the liquid storage tank (4) with the liquid passage (123), and a power pump (6) provided on the first infusion tube (5).

5. A battery electrolyte acidity detection device as claimed in claim 2, characterized in that: The cover (12) is provided with an infusion port (124), and the second infusion assembly comprises a sample dispenser (7) for loading a standard solution, and a second infusion tube (8) having one end connected to the sample dispenser (7) and the other end plugged into the infusion port (124), wherein the second infusion tube (8) is a soft tube.

6. A battery electrolyte acidity detection device as claimed in claim 5, characterized in that: The sample dispenser (7) comprises a liquid-filling cavity (71) for containing a standard solution, an infusion connector (72) for connecting the liquid-filling cavity (71) to the outside, and a driving member for changing the volume of the liquid-filling cavity (71); the infusion connector (72) is used to transport the standard solution to the liquid-filling cavity (71); one end of the second infusion tube (8) is connected to the liquid-filling cavity (71).

7. A battery electrolyte acidity detection device as claimed in claim 6, characterized in that: The driving member comprises a piston (73) disposed in the liquid-containing chamber (71), and a push rod (74) connected to the piston (73); the piston (73) is slidably connected to an inner wall of the liquid-containing chamber (71); and the push rod (74) pushes the piston (73) to move axially in the liquid-containing chamber (71).

8. A battery electrolyte acidity detection device as claimed in claim 2, characterized in that: The heat preservation component comprises a water tank (9) for loading an ice-water mixture, and a plug-in port (91) for plugging the detection bottle body (11) is provided on the top of the water tank (9).

9. A battery electrolyte acidity detection device as claimed in claim 8, characterized in that: A limit block (112) is provided on the periphery of the detection bottle body (11), and a limit slideway (92) cooperating with the limit block (112) and a slideway opening (93) communicating with the limit slideway (92) are provided on the periphery of the insertion port (91), wherein the limit block (112) is used to enter and exit the limit slideway (92).

10. A battery electrolyte acidity detection device as claimed in claim 1, characterized in that: The detection device further comprises a magnetic stirrer (10) arranged below the detection container (1), and a stirring magnet (101) arranged in the detection container (1), wherein the magnetic stirrer (10) is used to drive the stirring magnet (101) to rotate, and the stirring magnet (101) is used to stir the solution in the detection container (1).

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