System for testing solubility of electrolyte

Abstract

The embodiment of the utility model discloses a system for testing the solubility of an electrolyte, and relates to the field of batteries. The electrolyte solubility testing system is used for a battery monomer and comprises a sealed container, a sealed liquid injection assembly, a gas source and a gas volume measuring device. The sealed container has an accommodating space; the sealed liquid injection assembly is connected with the sealed container and is used for injecting a first volume of electrolyte into the sealed container; the gas source is connected with the sealed container and is used for injecting a second volume of gas to be detected into the sealed container; and the gas volume measuring device is connected with the sealed container and is used for measuring the residual volume of the gas to be measured after the gas is dissolved in the electrolyte. The electrolyte solubility testing system calculates the solubility by acquiring various volume parameters, can measure the solubility of gas generated in a battery monomer in the electrolyte, and provides powerful data support for research and production in related fields.

Description

Technical Field

[0001] This application relates to the field of batteries, and more specifically, to a testing system for electrolyte solubility. Background Technology

[0002] During their use, individual battery cells generate specific gases. These gases are closely related to the electrochemical processes inside the battery, and their solubility in the electrolyte has a crucial impact on the battery's performance, lifespan, and safety.

[0003] In related technologies, the solubility of gas in electrolyte is calculated by pressure difference. The residual gas in the pipeline and shell has a significant impact on the test structure. Utility Model Content

[0004] This application provides a testing system for electrolyte solubility, which can more accurately measure the solubility of gases generated in battery cells in the electrolyte, providing data support for research and production in related fields.

[0005] In a first aspect, this application provides a testing system for electrolyte solubility in a battery cell. The testing system includes: a sealed container having a containment space; a sealed liquid injection assembly connected to the sealed container for injecting a first volume of electrolyte into the sealed container; a gas source connected to the sealed container for injecting a second volume of a test gas into the sealed container; and a gas volume measuring device connected to the sealed container for measuring the remaining volume of the test gas after it has dissolved in the electrolyte.

[0006] In the technical solution of this application embodiment, the solubility of gas in the electrolyte is determined by obtaining the first volume, the second volume, and the remaining volume. This allows for the measurement of the solubility of gas generated in a battery cell in the electrolyte, providing strong data support for research and production in related fields. This method allows for the acquisition of the solubility of gas generated in the battery cell in the electrolyte, providing data and theoretical support for monitoring gas production from electrolyte redox decomposition, and improving the accuracy of gas production monitoring in battery cells.

[0007] In some embodiments of the first aspect, the test system further includes a processor for determining the solubility of the gas to be tested in the electrolyte based on a first volume, a second volume, and a remaining volume.

[0008] In this embodiment, the processor serves as the data hub of the entire testing system. The processor is closely connected to the sealing liquid injection component, gas source, gas volume measurement device, etc., and can quickly and accurately integrate multi-data from various components, reducing the uncertainty and error that may be caused by manual intervention.

[0009] In some embodiments of the first aspect, the test system further includes a flow controller, a first end of which is connected to a gas source and a second end of which is connected to a sealed container. The flow controller is used to control the gas flow rate and the time of injection of the gas to be tested.

[0010] In this embodiment, the first end of the flow controller is sealed to the gas source, and the second end is sealed to the sealed container. This allows for precise control of the gas flow rate and injection time of the gas to be tested. With the known gas flow rate and injection time, the total volume of the injected gas can be easily calculated, providing accurate data for subsequent solubility calculations and simplifying the data processing process.

[0011] In some embodiments of the first aspect, the gas volume measuring device includes a first container connected to a sealed container, the first container being filled with a reagent, and the gas to be measured being insoluble in the reagent.

[0012] In this embodiment, the volume of gas generated is determined by collecting the volume of the discharged reagent, which can intuitively and accurately reflect the actual amount of gas generated. The measurement results are more accurate, reducing errors caused by the measurement method itself and being less affected by external factors.

[0013] In some embodiments of the first aspect, the gas volume measuring device further includes a second container connected to the first container, the second container being used to measure the volume of reagent discharged from the first container.

[0014] In this embodiment, by measuring the volume of the discharged reagent through the second container, the remaining volume of the gas to be tested after dissolving in the electrolyte can be obtained, making the measurement process more convenient and faster, and requiring fewer manual operation steps, thus reducing the possibility of experimental errors caused by improper operation.

[0015] In some embodiments of the first aspect, the test system further includes a liquid extraction device connected to a sealed container for extracting electrolyte from the sealed container before the gas volume measuring device measures the remaining volume.

[0016] In this embodiment, since the electrolyte has a certain degree of volatility, it may interfere with the remaining volume of the gas to be tested. By adding a liquid extraction device, the electrolyte in the sealed container is extracted before the gas volume measuring device measures the remaining volume. This can reduce the possibility of the electrolyte interfering with the remaining volume of the gas to be tested and improve the accuracy of the test results of the test system.

[0017] In some embodiments of the first aspect, the test system further includes a liquid collection device connected to a liquid extraction device for collecting electrolyte extracted by the liquid extraction device.

[0018] In this embodiment, comprehensive compositional analysis can be performed on the electrolyte collected in the liquid collection device, which helps to reveal the microscopic changes that occur inside the electrolyte during the experiment. The collected electrolyte also contains potential resource value.

[0019] In some embodiments of the first aspect, the testing system includes a first valve, a first end of which is connected to a sealed container, a second end of which is connected to a liquid extraction device, and the first valve is opened after a predetermined time has elapsed since the electrolyte has dissolved the gas to be tested.

[0020] In this embodiment, the first valve is closed before the dissolution process reaches the predetermined time, which can effectively isolate the liquid extraction device from the sealed container and prevent the liquid extraction device from interfering with the dissolution process in the sealed container.

[0021] In some embodiments of the first aspect, the test system further includes a gas extraction device, a first end of which is connected to a sealed container and a second end of which is connected to a gas volume measuring device. The gas extraction device is used to extract the remaining gas in the sealed container after the gas to be tested has dissolved in the electrolyte.

[0022] In this embodiment, the gas extraction device can accelerate the speed at which undissolved gas to be tested enters the gas volume measuring device, enabling rapid transfer and measurement of the gas to be tested, accurate acquisition of the remaining gas volume, and prevention of gas accumulation in the sealed container.

[0023] In some embodiments of the first aspect, the evacuation device includes a vacuum pump that evacuates the test system to a vacuum state before the sealing liquid injection assembly injects liquid.

[0024] In this embodiment of the application, before the electrolyte injection component is injected, the vacuum pump evacuates the entire electrolyte solubility test system to a vacuum state, which can effectively remove various impurity gases that originally existed in the test system and reduce their impact on the test results.

[0025] In some embodiments of the first aspect, the test system further includes a second valve, a first end of which is connected to a sealed container and a second end of which is connected to a vacuum device.

[0026] In this embodiment, the second valve controls the gas flow between the extraction device and the sealed container, preventing unnecessary gas leakage or interference and improving the controllability and accuracy of the entire testing system. The gas flow direction can be flexibly adjusted by switching the opening and closing states of the second valve.

[0027] In some embodiments of the first aspect, the test system further includes a four-way valve, the first port of which is connected to a gas source, the second port of which is connected to a sealing liquid injection assembly, the third port of which is connected to a sealing container, and the fourth port of which is connected to the first end of a second valve.

[0028] In this embodiment, the four-way valve serves as a flow path control element, integrating the fluid connection between the sealed container, the sealed liquid injection assembly, the gas source, and the first end of the second valve. It can quickly switch the fluid path according to the needs of different stages of the experiment, reducing the complexity and redundancy of the pipeline connection in the test system.

[0029] In some embodiments of the first aspect, the processor is configured to determine the second volume based on the gas flow rate of the injected gas and the time of injection of the gas to be tested.

[0030] In this embodiment of the application, the processor can accurately obtain the second volume data in this way, avoiding the errors and tedious operations that may be caused by manual calculation, and providing an accurate data foundation for subsequent solubility calculation.

[0031] In some embodiments of the first aspect, the reagent is composed of water, sodium carbonate, or carbon tetrachloride.

[0032] In the embodiments of this application, water, sodium carbonate, or carbon tetrachloride have the characteristics of being chemically stable and not easily reacting with most gases.

[0033] In some embodiments of the first aspect, the test system further includes a barometer connected to a sealed container for measuring the pressure inside the sealed container.

[0034] In this embodiment, the pressure detector can simulate the actual pressure environment inside a single battery cell. By accurately monitoring and controlling the pressure inside the sealed container through the pressure detector, the experimental environment can closely resemble the actual operating conditions of the battery, making the test results more practically valuable and improving battery performance and safety.

[0035] In some embodiments of the first aspect, the test system further includes an adjustable heat bath container that houses a sealed container to regulate the temperature of the sealed container.

[0036] In this embodiment, the sealed container is placed in an adjustable heat bath container with adjustable temperature. By adjusting the temperature of the adjustable heat bath container, the test environment temperature is changed, thereby simulating the temperature conditions under different practical application scenarios or experimental research needs, and thus realizing the solubility test under different test environment temperatures.

[0037] In some embodiments of the first aspect, the ratio of electrolyte volume to sealed container volume is less than or equal to 0.2.

[0038] In this embodiment, the volume ratio setting can also better simulate the gas-liquid distribution under these actual working conditions. By maintaining a similar volume ratio in the testing system, the measured gas solubility data has greater practical application value.

[0039] In some embodiments of the first aspect, the sealed container is the housing of a battery cell.

[0040] In this embodiment, the gas to be tested is the gas generated during the use of the battery cell. In order to enable the test system to more accurately measure the solubility of the gas to be tested in the electrolyte, the casing of the battery cell is used as a sealed container, which can better simulate the internal situation of the battery cell. Attached Figure Description

[0041] Figure 1 This is a schematic diagram illustrating the internal changes of a single battery cell during use, according to an embodiment of this application.

[0042] Figure 2 This is a structural diagram of the electrolyte solubility testing system according to an embodiment of this application;

[0043] Figure 3 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application;

[0044] Figure 4 This is a structural diagram of the gas volume measuring device according to an embodiment of this application;

[0045] Figure 5 This is another structural diagram of the gas volume measuring device according to an embodiment of this application;

[0046] Figure 6 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application;

[0047] Figure 7 This is a structural diagram of the liquid extraction device according to an embodiment of this application;

[0048] Figure 8 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application;

[0049] Figure 9 Another structural diagram of the electrolyte solubility testing system according to an embodiment of this application;

[0050] Figure 10 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application;

[0051] Figure 11 This is a structural diagram of the air extraction device according to an embodiment of this application;

[0052] Figure 12This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application;

[0053] Figure 13 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application;

[0054] Figure 14 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application;

[0055] Figure 15 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application;

[0056] Figure 16 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application.

[0057] The accompanying drawings are not drawn to scale.

[0058] Figure label:

[0059] 100-Battery cell; 101-Residual space; 1-Sealed container; 2-Sealed liquid injection assembly; 3-Gas source; 4-Gas volume measuring device; 41-First container; 42-Second container; 5-Flow controller; 6-Liquid extraction device; 61-Liquid extraction motor; 62-Liquid inlet pipe; 63-Liquid outlet pipe; 7-Liquid collection device; 8-First valve; 9-Air extraction device; 91-Air extraction motor; 92-Air inlet pipe; 93-Air outlet pipe; 10-Second valve; 11-Four-way valve; 12-Gas pressure detector; 13-Adjustable heat bath container. Detailed Implementation

[0060] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0061] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0062] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0063] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0064] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0065] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0066] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0067] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0068] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0069] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0070] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0071] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited thereto.

[0072] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the negative and positive electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, reduces the occurrence of short circuits while allowing active ions to pass through.

[0073] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte can be liquid, gel, or solid.

[0074] Liquid electrolytes include electrolyte salts and solvents.

[0075] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0076] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0077] In some embodiments, the electrolyte may further include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0078] The gel electrolyte includes a polymer as a backbone network and can be used in conjunction with an ionic liquid-lithium salt.

[0079] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0080] As an example, the polymers of polymeric solid electrolytes may include polyethers (polyoxyethylene), polysiloxanes, polycarbonates, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids, cellulose, etc.

[0081] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0082] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0083] Currently, judging from market trends, the application of power batteries is becoming increasingly widespread. Power batteries are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but also extensively used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of power battery applications, market demand is also constantly increasing.

[0084] During their use, individual battery cells generate specific gases. These gases are closely related to the electrochemical processes inside the battery, and their solubility in the electrolyte has a crucial impact on the battery's performance, lifespan, and safety.

[0085] Based on the above considerations, this application provides a testing system for electrolyte solubility. This testing system is used for a single battery cell and may include a sealed container, a sealing liquid injection assembly, a gas source, and a gas volume measuring device. The sealed container has a containment space; the sealing liquid injection assembly is connected to the sealed container and is used to inject a first volume of electrolyte into the sealed container; the gas source is connected to the sealed container and is used to inject a second volume of the gas to be tested into the sealed container; the gas volume measuring device is connected to the sealed container and is used to measure the remaining volume of the gas to be tested after it dissolves in the electrolyte.

[0086] In this embodiment, by obtaining various volume parameters and calculating solubility, the solubility of gases generated in battery cells in the electrolyte can be measured, providing strong data support for research and production in related fields. This method allows for the acquisition of the solubility of gases generated in battery cells in the electrolyte, providing data and theoretical support for monitoring gas production from electrolyte redox decomposition, and improving the accuracy of gas production monitoring in battery cells.

[0087] Figure 1 This is a schematic diagram illustrating the internal changes of a single battery cell during use, according to an embodiment of this application. Figure 1 As shown, Figure 1 (a) in the figure represents the initial state of the battery cell 100, that is, the battery cell 100 is unused or just used. The shaded part is the residual space 101 inside the battery cell 100. The residual space 101 is the space inside the battery cell 100 that is available for gas to exist or flow after removing the space occupied by mechanical parts, electrode components, electrolyte, etc.

[0088] Figure 1 (b) in the figure represents the initial state of battery cell 100 during the early stages of aging. As battery cell 100 is put into use, a series of complex electrochemical reactions gradually lead to the generation of gaseous and solid substances during cyclic charging, discharging, and storage. Figure 1Unfilled circles represent solid materials, while circles filled with vertical lines represent gaseous materials. In the early stages of aging, newly generated gases begin to accumulate in the residual spaces 101 inside the battery cell 100. Gas molecules continuously diffuse and fill these residual spaces 101. Due to the continuous generation of gas and the limited pathways for outward diffusion, the gas gradually occupies more of the residual spaces 101. The gas composition at this stage is relatively complex and may contain multiple gases such as hydrogen, carbon dioxide, and carbon monoxide.

[0089] Figure 1 (c) represents the state of battery cell 100 in the middle and late stages of aging. When battery cell 100 enters the middle and late stages of aging, the amount of gas produced increases further. At this time, since the internal gas pressure has risen to a certain level, according to the solubility characteristics of gas in liquid, some gas will begin to dissolve in the electrolyte under pressure. Figure 1 The circles filled with horizontal lines represent gases dissolved in the electrolyte. This dissolution process is not a simple physical mixing, but involves interactions between gas molecules and solvent molecules and solute ions in the electrolyte. For example, some polar gas molecules may form weak chemical bonds or intermolecular forces with polar solvent molecules in the electrolyte, thus entering the liquid phase of the electrolyte. The amount of gas dissolved in the electrolyte is closely related to various factors such as the internal pressure and temperature of the battery cell 100, as well as the composition and concentration of the electrolyte. Higher pressure is more conducive to gas dissolution in the electrolyte; while at higher temperatures, the solubility of gases in the electrolyte usually decreases, which may cause some dissolved gases to re-precipitate. Changes in the composition and concentration of the electrolyte also affect the gas dissolution equilibrium; for example, different lithium salt concentrations and solvent ratios will change the electrolyte's ability to dissolve specific gases. These gases dissolved in the electrolyte may further participate in electrochemical reactions during the subsequent use of the battery cell 100, or be released again when conditions such as temperature and pressure change, thus having a continuous impact on the performance, safety and lifespan of the battery cell 100.

[0090] Therefore, testing the solubility of gases in the electrolyte is of reference value for the use and optimization of battery cells 100. The following section combines... Figures 2 to 16 The testing system for electrolyte solubility is introduced.

[0091] Figure 2 This is a structural diagram of the electrolyte solubility testing system according to an embodiment of this application. Figure 2As shown, the electrolyte solubility testing system is used for a battery cell 100. The testing system may include a sealed container 1, a sealed liquid injection assembly 2, a gas source 3, and a gas volume measuring device 4. The sealed container 1 has a containment space; the sealed liquid injection assembly 2 is connected to the sealed container 1 and is used to inject a first volume of electrolyte into the sealed container 1; the gas source 3 is connected to the sealed container 1 and is used to inject a second volume of the gas to be tested into the sealed container 1; the gas volume measuring device 4 is connected to the sealed container 1 and is used to measure the remaining volume of the gas to be tested after it dissolves in the electrolyte.

[0092] It should be understood that the connections between the sealed container 1 and the sealed liquid injection assembly 2, and between the gas source 3 and the gas volume measuring device 4, are all sealed connections.

[0093] It should be understood that the type of sealed container 1 is not limited in this application, as long as it is a sealed shell that can hold electrolyte and withstand a certain pressure.

[0094] In this embodiment, the sealed container 1 can be made of a chemically resistant material to ensure it can withstand various electrolyte and test gas environments, preventing corrosion of the sealed container 1 and affecting the test results. The inner wall of the sealed container 1 can be smoothed to effectively reduce liquid or gas residue and ensure the accuracy and repeatability of each test.

[0095] In this embodiment of the application, the sealing liquid injection assembly 2 can be a device that performs an electrolyte injection operation into the sealing container 1 and can seal it after the liquid injection is completed.

[0096] In this embodiment of the application, the sealed container 1 may include a liquid inlet, which is connected to a liquid inlet pipe. The sealing liquid injection assembly 2 can inject electrolyte into the sealed container 1 through the liquid inlet pipe. When the liquid inlet is sealed, the entire shell of the sealed container 1 is in a sealed state.

[0097] In this application embodiment, the type of sealing liquid injection component 2 is not limited. For example, the sealing liquid injection component 2 may include a vent cap, a sealing gasket, and an adapter. When the vent cap is open, liquid injection operation can be realized, and when the vent cap is closed, sealing function can be realized.

[0098] In this embodiment, for example, the gas source 3 may include a gas storage cylinder. The gas storage cylinder is used to store the gas to be tested, and its material and sealing performance must meet the safety standards for high-pressure gas storage.

[0099] In this embodiment of the application, the sealed container 1 may include an air inlet, which is connected to an air inlet pipe. The air source 3 can be connected to the sealed container 1 through the air inlet pipe, and the connection method is a sealed connection.

[0100] It should be understood that the gas to be tested can be the gas generated by the battery cell 100 during use.

[0101] In this embodiment, the gas volume measuring device 4 can measure the remaining volume of the gas to be tested after dissolving in the electrolyte by means of water displacement, or it can be calculated by obtaining the flow rate and time of the gas to be tested through the gas volume measuring device 4. This application does not limit the method.

[0102] In this embodiment of the application, the sealed container 1 may include an outlet, which is connected to an outlet pipe. The gas volume measuring device 4 can be connected to the sealed container 1 through the outlet pipe, and the connection method is a sealed connection.

[0103] In this embodiment, during testing, a first volume of electrolyte is first injected into a sealed container 1 using the sealing injection assembly 2, and then a second volume of the gas to be tested is injected into the sealed container 1 using the gas source 3. In the sealed container 1, the gas to be tested gradually dissolves in the electrolyte. When the dissolution reaches saturation, the gas to be tested can no longer dissolve in the electrolyte. The gas volume measuring device 4 measures the remaining volume of the gas to be tested after dissolution, and calculates the solubility of the gas to be tested in the electrolyte based on the injected first and second volumes.

[0104] It should be understood that the difference between the second volume and the remaining volume is the volume of the gas to be tested dissolved in the electrolyte, and the ratio of this difference to the first volume is the solubility of the gas to be tested in the electrolyte. That is, c = (V² - V³) / (V³ ... s ) / V1, where c represents solubility, V1 represents the first volume, V2 represents the second volume, and V s This indicates the remaining volume of the gas being tested after it has dissolved in the electrolyte.

[0105] In this embodiment, by obtaining various volume parameters and calculating solubility, the solubility of gases generated in the battery cell 100 in the electrolyte can be measured, providing strong data support for research and production in related fields. This method allows for the acquisition of the solubility of gases generated in the battery cell 100 in the electrolyte, providing data and theoretical support for monitoring gas production from electrolyte redox decomposition, and improving the accuracy of gas production monitoring in the battery cell 100.

[0106] In this embodiment of the application, the testing system further includes a processor, which is used to determine the solubility of the gas to be tested in the electrolyte based on the first volume, the second volume and the remaining volume.

[0107] In this embodiment of the application, the processor, as the core data processing unit of the entire test system, can obtain the volume of electrolyte injected into the sealed container 1 by the sealing liquid injection component 2, the volume of the gas to be tested injected into the sealed container 1 by the gas source 3, and the remaining volume of the gas to be tested measured by the gas volume measuring device 4.

[0108] In this embodiment of the application, for example, the test system may include a liquid level monitoring device located in the sealing injection assembly 2, and the processor may obtain a first volume from the liquid level monitoring device.

[0109] In this embodiment of the application, for example, the test system may include a flow sensor located in the gas source 3, and the processor may obtain a second volume from the flow sensor.

[0110] In this embodiment of the application, for example, the testing system may include a data processing module located in the gas volume measuring device 4, and the processor can obtain the remaining volume from the data processing module.

[0111] It should be understood that the processor also includes a dedicated solubility calculation algorithm program, which, after receiving the data of the first volume, the second volume and the remaining volume, can also calculate the solubility of the gas to be tested in the electrolyte according to the solubility calculation formula.

[0112] In this embodiment, the processor serves as the data hub of the entire testing system. Closely connected to the sealing liquid injection component 2, gas source 3, and gas volume measuring device 4, the processor can rapidly and accurately integrate multi-data from various components. Based on this data input, the processor performs efficient data processing according to its built-in algorithm, reducing uncertainties and errors that may arise from manual intervention. Furthermore, it allows for flexible setup and precise execution of experiments within a wider range of conditions, providing strong technical support for comprehensive and in-depth research on electrolyte solubility.

[0113] Figure 3 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application. Figure 3 As shown, the electrolyte solubility testing system also includes a flow controller 5. The first end of the flow controller 5 is connected to the gas source 3, and the second end of the flow controller 5 is connected to the sealed container 1. The flow controller 5 is used to control the gas flow rate and the time of injection of the gas to be tested.

[0114] In this embodiment, the flow controller 5 can be a mass flow controller (MFC), which can control the flow rate of the gas to be tested by controlling the flow rate and time of the injected gas. That is, the flow controller 5 is a flow stabilizing device, which is a gas flow stabilizing device that can be manually set or automatically controlled by connecting to a computer.

[0115] It should be understood that after performing the liquid injection or gas injection operation, the flow controller 5 should be turned off.

[0116] In the embodiments of the present application, a mass flow controller (MFC) may be composed of a flow sensor, a diverter channel, a flow regulating valve, an amplifier controller, etc. The gas flow sensor measures the mass flow of the gas using the principle of capillary heat transfer differential calorimetry (without temperature and pressure compensation). The flow signal measured by the sensor heating bridge is sent to the amplifier for amplification. The amplified flow detection voltage is compared with the set voltage, and then the difference signal is amplified and used to control the regulating valve, and the flow through the channel is closed-loop controlled to be equal to the set flow. The diverter determines the flow of the main channel. A flow display instrument supporting the mass flow controller is provided with a regulated power supply, a digital voltmeter, a set potentiometer, peripherals, internal and external conversion, a three-way valve control switch, etc.

[0117] In the embodiments of the present application, a gas flow regulating valve is provided in the mass flow controller (MFC). This valve can adjust the flow through the controller from zero to the measured full scale. During operation, a pressure drop, i.e., a differential pressure, will occur between the inlet and outlet of the MFC. The working differential pressure range of the MFC is usually 0.1 - 0.3 MPa. When the MFC is in use, the differential pressure at both ends of the MFC for inlet and outlet gas should be maintained within the required differential pressure range, and the air pressure is required to be relatively stable.

[0118] In the embodiments of the present application, the first end of the flow controller 5 is hermetically connected to the gas source 3, and the second end is hermetically connected to the sealed container 1, which can accurately control the gas flow rate of the injected test gas and the injection time of the test gas, so that the amount of gas injected into the sealed container 1 is consistent each time the test is performed, improving the accuracy and repeatability of the test results. Given the known gas flow rate and injection time, the total volume of the injected gas can be easily calculated, providing accurate data for the subsequent calculation of solubility and simplifying the data processing process. Different electrolytes may have different gas requirements when reacting with gases, and the flow controller can be flexibly adjusted according to actual needs to meet diverse test requirements.

[0119] Figure 4 is the structural diagram of the gas volume measurement device for the embodiments of the present application. As Figure 4 shown, the gas volume measurement device 4 includes a first container 41. The first container 41 is connected to the sealed container 1, and the first container 41 is filled with a reagent, and the test gas is insoluble in the reagent. <![CDATA[ ]]>

[0120] In the embodiments of the present application, the gas volume measurement device 4 can measure the remaining volume of the test gas by the water displacement method.

[0121] In the embodiments of the present application, the first container 41 can be made of a transparent and chemically corrosion-resistant material, which is convenient for observing the state of the internal reagent and the interface between the gas and the reagent.

[0122] In this embodiment, the first container 41 is connected to the sealed container 1 through a conduit. The first container 41 can be made of transparent material and have scale markings to facilitate intuitive observation of changes in gas volume.

[0123] It should be understood that the selected reagent must be insoluble in the test gas to ensure that the test gas entering the first container 41 can exist in gaseous form in the space above the reagent, so as to achieve effective measurement of its volume.

[0124] In this embodiment, the first container 41 is filled with reagents, so that there is no air in the first container 41, thus preventing air from interfering with the gas to be tested.

[0125] In this embodiment of the application, the top of the first container 41 is provided with an air inlet duct connected to the sealed container 1. The diameter and length of the air inlet duct are reasonably designed to ensure that the gas can enter smoothly while minimizing the gas residue and diffusion loss in the duct.

[0126] It should be understood that the first container 41 can be a regular shape such as a cylinder, which facilitates the accurate calculation of the gas volume based on the changes in the liquid level or the height of the space occupied by the gas. The container wall is marked with clear scale markings, which can help to intuitively read the gas volume value or observe the changes in gas volume.

[0127] In this embodiment, the first container 41 is pre-filled with a specific reagent, the bottle mouth is covered with a glass plate, and then it is inverted in a tank. When bubbles are continuously and evenly released from the tube opening, the tube opening is then inserted into the first container 41 filled with reagent. When bubbles are seen emerging from the outer edge of the bottle mouth of the first container 41 and the liquid level in the first container 41 drops to the bottle mouth, the bottle mouth is covered with a glass plate in the reagent, and the first container 41 is removed from the water surface and placed upright or upside down on the table: when the density of the gas to be tested is greater than that of air, it is placed upright on the table; when the density of the gas to be tested is less than that of air, it is placed upside down on the table.

[0128] In this embodiment, the volume of gas produced is determined by collecting the volume of the discharged reagent, which can intuitively and accurately reflect the actual amount of gas generated. The measurement results are relatively precise. The water displacement method does not require complex gas conversions or reliance on other potentially error-prone intermediate steps, reducing errors caused by the measurement method itself and being less affected by external factors. The experimental setup required for the water displacement method is usually simple, easy to set up and operate, and does not require complex equipment and techniques, reducing the difficulty and cost of the experiment. During the experiment, the gas generation and collection process is clearly visible. By observing the changes in the water level in the gas collecting bottle and the generation of bubbles, the progress of the reaction and the gas collection can be intuitively judged, facilitating timely adjustment and control of the experimental process by the experimenter.

[0129] Figure 5 This is another structural diagram of the gas volume measuring device according to an embodiment of this application. Figure 5 As shown, the gas volume measuring device 4 also includes a second container 42, which is connected to the first container 41. The second container 42 is used to measure the volume of the reagent discharged from the first container 41.

[0130] In this embodiment of the application, the drainage method can also be accomplished by another device. The second container 42 is connected to the first container 41. The second container 42 can also be made of transparent material, and the container wall is marked with clear scale markings, which can help to intuitively read the gas volume value or observe the gas volume change. Its material has good chemical stability to adapt to the properties of the reagents it comes into contact with.

[0131] In this embodiment of the application, in terms of the connection method, the first container 41 and the sealed container 1 are sealed and connected through a conduit, and the second container 42 and the first container 41 are sealed and connected through a conduit. That is, the first container 41 includes two conduits, and the conduits need to be inserted into the reagent.

[0132] In this embodiment, the first container 41 is filled with reagents, so that there is no air in the first container 41, thus preventing air from interfering with the gas to be tested.

[0133] In the embodiments of this application, the reagent may be, for example, a sodium carbonate solution.

[0134] In this embodiment, for example, the conduit may have a control valve.

[0135] In this embodiment, since the first container 41 and the second container 42 constitute a connected system, according to the principle of conservation of mass and the characteristic that gas is insoluble in reagent, the volume of reagent flowing into the second container 42 is equal to the volume of the gas to be tested discharged from the first container 41. Thus, the remaining volume of the gas to be tested after dissolving in the sealed container 1 can be indirectly measured.

[0136] In this embodiment, by measuring the volume of the discharged reagent through the second container 42, the remaining volume of the gas to be tested after dissolving in the electrolyte can be obtained, making the measurement process more convenient and faster. The device remains sealed throughout the measurement of the remaining volume, resulting in stronger sealing performance and more accurate measurement results. The required experimental setup is relatively simple, and fewer manual operation steps are needed, reducing the possibility of experimental errors due to improper operation.

[0137] Figure 6 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application. Figure 6As shown, the electrolyte solubility testing system also includes a liquid extraction device 6, which is connected to the sealed container 1 and is used to extract the electrolyte in the sealed container 1 before the gas volume measuring device 4 measures the remaining volume.

[0138] It should be understood that the specific type of the liquid extraction device 6 is not unique; any device capable of extracting liquid of this type is acceptable.

[0139] Figure 7 This is a structural diagram of the liquid extraction device according to an embodiment of this application. Figure 7 As shown, the liquid extraction device 6 may include a liquid extraction motor 61, an inlet pipe 62 and an outlet pipe 63, and the inlet pipe 62 is connected to the sealed container 1.

[0140] In this embodiment, the sealed container 1 may include a liquid outlet, which is connected to a liquid inlet pipe 62. The liquid extraction device 6 can be connected to the sealed container 1 through the liquid inlet pipe 62, and the connection method is a sealed connection.

[0141] In this embodiment, the liquid extraction device 6 is connected to the bottom or near the bottom of the sealed container 1 so as to effectively extract the electrolyte.

[0142] In this embodiment, when the liquid pumping device 6 is in use, the liquid pumping motor 61 operates to pump liquid, and the electrolyte flows in from the inlet pipe 62 and flows out from the outlet pipe 63.

[0143] In this embodiment, since the electrolyte has a certain degree of volatility, it may interfere with the remaining volume of the gas to be tested. By adding a liquid extraction device 6, the electrolyte in the sealed container 1 is extracted after the gas to be tested and the electrolyte are injected and fully dissolved, and before the gas volume measuring device 4 measures the remaining volume, which can reduce the possibility of the electrolyte interfering with the remaining volume of the gas to be tested and improve the accuracy of the test results of the test system.

[0144] Figure 8 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application. Figure 8 As shown, the electrolyte solubility testing system also includes a liquid collection device 7, which is connected to the liquid extraction device 6 and is used to collect the electrolyte extracted by the liquid extraction device 6.

[0145] It should be understood that the inlet pipe 62 of the liquid extraction device 6 is connected to the sealed container 1, and the outlet pipe 63 of the liquid extraction device 6 is connected to the liquid collection device 7.

[0146] It should be understood that when the liquid extraction device 6 is in operation, the electrolyte flows in from the inlet pipe 62, flows out from the outlet pipe 63, and enters the liquid collection device 7.

[0147] In this embodiment, the internal volume of the liquid collection device 7 is designed based on the maximum amount of electrolyte that may be extracted in the experiment, and a certain margin is generally reserved to prevent electrolyte overflow.

[0148] It should be understood that the liquid collection device 7 has good sealing performance, which can effectively prevent the electrolyte from evaporating and polluting the environment during the collection process, and avoid the impact of changes in electrolyte concentration caused by evaporation on the accuracy of experimental results.

[0149] In this embodiment, the liquid collection device 7 is provided with an inlet connected to the liquid extraction device 6. The inlet is sealed, for example, by threaded connection and sealing gasket, to ensure a tight and leak-free connection.

[0150] In this embodiment, the liquid collection device 7 may be provided with a discharge port at the bottom, so that the collected electrolyte can be discharged for subsequent processing or recycling after the experiment. A valve may be configured at the discharge port to control the discharge operation of the electrolyte.

[0151] In this embodiment, the electrolyte collected in the liquid collection device 7 can be analyzed for its composition, which helps to reveal the microscopic changes that occur inside the electrolyte during the experiment. The collected electrolyte also contains potential resource value. After careful analysis, purification, and processing, some of its components may be recycled and reused. In addition, by effectively collecting the electrolyte extracted by the pumping device 6, the direct discharge of the electrolyte into the environment is prevented, which would cause serious pollution to the soil, water bodies, and other ecological environments, disrupt the ecological balance, and potentially trigger a series of environmental problems.

[0152] Figure 9 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application. Figure 9 As shown, the electrolyte solubility testing system may include a first valve 8, the first end of the first valve 8 is connected to the sealed container 1, the second end of the first valve 8 is connected to the liquid extraction device 6, and the first valve 8 is opened after the electrolyte has dissolved the gas to be tested for a predetermined time.

[0153] It should be understood that the first valve 8 can be a switch, controlling the opening and closing of the pipeline connecting the sealed container 1 and the liquid extraction device 6. For example, the first valve 8 is a liquid valve.

[0154] It should be understood that, in order for the gas to be tested to fully dissolve in the electrolyte, after the liquid injection and gas injection operations, for example, the test system can be left to stand for more than 30 minutes to allow sufficient time for the gas to be tested to come into contact with the electrolyte.

[0155] It should be understood that after the gas and liquid injection, during the dissolution process of the gas to be tested and the electrolyte, the first valve 8 is in the closed state.

[0156] It should be understood that after the gas to be tested and the electrolyte are fully dissolved, the liquid extraction device 6 is turned on first, and then the first valve 8 is turned on to extract the electrolyte. After the extraction is completed, the liquid extraction device 6 is turned off first, and then the first valve 8 is turned off.

[0157] In this embodiment, the first valve 8 can be made of a material that is resistant to chemical corrosion and has good sealing properties, and can work stably in different chemical environments without the risk of leakage.

[0158] In this embodiment, the first valve 8 is closed before the dissolution process reaches a predetermined time, effectively isolating the pumping device 6 from the sealed container 1 and preventing the pumping device 6 from interfering with the dissolution process within the sealed container 1. The first valve 8 opens after the electrolyte has dissolved the gas to be tested for the predetermined time, ensuring that the gas has sufficient time to dissolve in the electrolyte and reach a relatively stable dissolution equilibrium. The preset dissolution time ensures the consistency and sufficiency of the gas dissolution process in each test, avoiding inaccurate solubility data due to insufficient dissolution time.

[0159] Figure 10 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application. Figure 10 As shown, the electrolyte solubility testing system also includes a gas extraction device 9. The first end of the gas extraction device 9 is connected to the sealed container 1, and the second end of the gas extraction device 9 is connected to the gas volume measuring device 4. The gas extraction device 9 is used to extract the remaining gas in the sealed container 1 after the gas to be tested has dissolved in the electrolyte.

[0160] It should be understood that the gas extraction device can extract the gas to be tested from the sealed container 1, and the specific type is not limited in this application.

[0161] Figure 11 This is a structural diagram of the air extraction device according to an embodiment of this application. Figure 11 As shown, the air extraction device 9 may include an air extraction motor 91, an air inlet pipe 92 and an air outlet pipe 93, with the air inlet pipe 92 connected to the sealed container 1.

[0162] In this embodiment, the sealed container 1 may include an air outlet, which is connected to an air inlet pipe 92. The air extraction device 9 can be connected to the sealed container 1 through the air inlet pipe 92 and to the gas volume measuring device 4 through the air outlet pipe 93, and the connection method is a sealed connection.

[0163] In this embodiment, the vacuum device 9 is connected to the top or near the top of the sealed container 1 so as to effectively extract the electrolyte.

[0164] In this embodiment of the application, when the air extraction device 9 is in use, the air extraction motor 91 operates to extract air, and the air to be tested flows in from the air inlet pipe 92 and flows out from the air outlet pipe 93.

[0165] In this embodiment, the pumping device 9 can accelerate the speed at which undissolved gas to be tested enters the gas volume measuring device 4, enabling rapid transfer and measurement of the gas to be tested, accurate acquisition of the remaining gas volume, and prevention of gas to be tested from accumulating in the sealed container 1.

[0166] In this embodiment, the vacuum pump 9 includes a vacuum pump, which evacuates the electrolyte solubility test system to a vacuum state before the sealing liquid injection assembly 2 injects liquid.

[0167] In this embodiment of the application, before the test system is run, i.e. before liquid injection and gas injection, the entire test system needs to be evacuated by a vacuum pump.

[0168] It should be understood that the vacuum device 9 can also evacuate the electrolyte solubility test system to a vacuum state.

[0169] It should be understood that the vacuum pump can also be installed separately in this test system.

[0170] In this embodiment, before the liquid injection component 2 is injected, the vacuum pump evacuates the entire electrolyte solubility test system to a vacuum state, which can effectively remove various impurity gases that were originally present in the test system. If these impurity gases are present during the test, they may react with the gas to be tested or the electrolyte, or interfere with the dissolution process of the gas in the electrolyte, thereby affecting the accuracy of the final solubility measurement.

[0171] In this embodiment, the sealing performance of the entire testing system can be indirectly detected by monitoring pressure changes within the system during the vacuuming process. If a leak exists, the pressure will fail to reach the expected vacuum level or pressure will rise during vacuum pump operation. This method allows for timely detection and repair of poorly sealed areas, ensuring good sealing during subsequent liquid injection, gas injection, and solubility measurements. It prevents gas leaks from affecting experimental results and improves experimental safety.

[0172] Figure 12 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application. Figure 12 As shown, the electrolyte solubility testing system also includes a second valve 10, the first end of which is connected to the sealed container 1, and the second end of which is connected to the vacuum device 9.

[0173] It should be understood that the testing system may include a second valve 10, an air extraction device 9, and a gas volume measuring device 4, wherein the first end of the second valve 10 is connected to the sealed container 1, the second end of the second valve 10 is connected to the air inlet pipe 92 of the air extraction device 9, and the air outlet pipe 93 of the air extraction device 9 is connected to the gas volume measuring device 4.

[0174] It should be understood that the testing system may also include a second valve 10 and a gas volume measuring device 4, wherein the first end of the second valve 10 is connected to the sealed container 1, and the second end of the second valve 10 is connected to the gas volume measuring device 4.

[0175] It should be understood that the second valve 10 is a device that can allow gas to flow through by conduction control and block gas flow through by cut-off control.

[0176] It should be understood that the second valve 10 can be a switch to control the opening and closing of the pipe connecting the sealed container 1 and the air extraction device 9. For example, the second valve 10 can be an air valve.

[0177] It should be understood that after the gas and liquid injection, during the dissolution process of the gas to be tested and the electrolyte, the second valve 10 is in the closed state.

[0178] It should be understood that after the gas to be tested is fully dissolved in the electrolyte, the pumping device 9 is turned on first, and then the second valve 10 is turned on to extract the remaining gas to be tested. After the extraction is completed, the pumping device 9 is turned off first, and then the second valve 10 is turned off.

[0179] In this embodiment, the second valve 10 can be made of a material that is resistant to chemical corrosion and has good sealing properties, and can work stably in different chemical environments without the risk of leakage.

[0180] In this embodiment, the second valve 10 controls the gas passage between the vacuum device 9 and the sealed container 1, avoiding unnecessary gas leakage or interference and improving the controllability and accuracy of the entire testing system. By switching the open and closed states of the second valve 10, the gas flow direction can be flexibly adjusted. For example, during different stages of the testing system operation, such as evacuating the sealed container 1 before liquid injection, waiting for gas dissolution after liquid injection, and extracting residual gas, the second valve 10 can be closed or opened as needed to achieve orderly gas flow between different components.

[0181] Figure 13 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application. Figure 13As shown, the electrolyte solubility testing system also includes a four-way valve 11. The first port of the four-way valve 11 is connected to the gas source 3, the second port of the four-way valve 11 is connected to the sealing liquid injection assembly 2, the third port of the four-way valve 11 is connected to the sealing container 1, and the fourth port of the four-way valve 11 is connected to the first end of the second valve 10.

[0182] Figure 14 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application. Figure 14 As shown, the electrolyte solubility testing system also includes a four-way valve 11. The first port of the four-way valve 11 is connected to the flow controller 5, the second port of the four-way valve 11 is connected to the sealing injection assembly 2, the third port of the four-way valve 11 is connected to the sealing container 1, and the fourth port of the four-way valve 11 is connected to the first end of the second valve 10.

[0183] In this embodiment, the sealing container 1, the sealing liquid injection assembly 2, the gas source 3, and the first end of the second valve 10 are connected by a four-way valve 11, or the sealing container 1, the sealing liquid injection assembly 2, the flow controller 5, and the first end of the second valve 10 are connected to further improve the connection reliability of the electrolyte solubility test system.

[0184] In this embodiment, the four-way valve 11 serves as a flow path control element, integrating the fluid connection between the sealed container 1, the sealed liquid injection assembly 2, the gas source 3 or the flow controller 5, and the first end of the second valve 10. It can quickly switch the fluid path according to the needs of different experimental stages, achieving seamless connection of multiple functional operations. This reduces the complexity and redundancy of the pipeline connections in the test system, making the layout of the entire test system more compact and more integrated. Using the four-way valve 11 not only saves space but also reduces the leakage risk of the test system.

[0185] In this embodiment of the application, the processor is used to determine the second volume based on the gas flow rate of the injected gas to be tested and the time of injection of the gas to be tested.

[0186] In this embodiment, during the injection of the gas to be tested, the flow controller 5 connected to the gas source 3 monitors the gas flow rate data in real time and transmits it to the processor. Simultaneously, the processor also receives the injection time information set and recorded by the flow controller. Based on the received gas flow rate and time data, the processor calculates the volume of the gas to be tested injected into the sealed container 1, i.e., the second volume, according to the volume calculation formula V2=ut (where V2 represents the second volume, u represents the gas flow rate, and t represents time).

[0187] In this embodiment of the application, the processor can accurately obtain the second volume data in this way, avoiding the errors and tedious operations that may be caused by manual calculation, and providing an accurate data foundation for subsequent solubility calculation.

[0188] In this embodiment, the reagent consists of water, sodium carbonate, or carbon tetrachloride.

[0189] In this embodiment, water is the most commonly used reagent in the water displacement method, possessing advantages such as chemical stability, low reactivity with most gases, and inexpensive availability.

[0190] In this embodiment, the sodium carbonate solution is relatively stable and not easily decomposed or deteriorated. It can maintain the consistency of its chemical properties during the experiment, ensuring the reliability of the experimental results.

[0191] In this embodiment, carbon tetrachloride is an organic solvent with a density greater than water, is insoluble in water, and has relatively stable chemical properties. Some gases that react with water or have high solubility in water but low solubility in carbon tetrachloride can be used as reagents in the water displacement method.

[0192] Figure 15 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application. Figure 15 As shown, the electrolyte solubility testing system also includes a pressure detector 12, which is connected to the sealed container 1 and is used to measure the pressure inside the sealed container 1.

[0193] It should be understood that the air pressure detector 12 can be a pressure sensor, etc. For example, a pressure gauge can be used to detect air pressure. This application does not limit the specific type.

[0194] It should be understood that the specific location of the pressure detector 12 is not limited in this application. The pressure detector 12 can be located in the sealed container 1 or on the air inlet pipe connecting the air source 3 and the sealed container 1.

[0195] In this embodiment, the housing of the barometer 12 has good sealing and corrosion resistance, ensuring stable operation in environments where it is in contact with electrolytes, the gas to be measured, etc. for a long time, and preventing the measurement error from increasing due to factors such as chemical corrosion.

[0196] In this embodiment, the connection between the pressure detector 12 and the sealed container 1 must be sealed to prevent gas leakage from affecting the accuracy of pressure measurement. The pressure detector 12 can be connected to the sealed container 1 by setting a connection interface at a suitable location on the sealed container 1 and using a threaded connection or flange connection with excellent sealing performance.

[0197] In this embodiment, the pressure detector 12 can simulate the actual pressure environment inside the battery cell 100. During the actual operation of the battery cell 100, the internal pressure will dynamically change due to factors such as gas generation from electrochemical reactions and temperature changes. By accurately monitoring and controlling the pressure inside the sealed container 1 through the pressure detector 12, the experimental environment can closely resemble the actual operating conditions of the battery, making the test results more practically valuable and improving battery performance and safety.

[0198] Figure 16 This is another structural diagram of the electrolyte solubility testing system according to an embodiment of this application. Figure 16 As shown, the electrolyte solubility testing system also includes an adjustable heat bath container 13, which contains a sealed container 1 to adjust the temperature of the sealed container 1.

[0199] It should be understood that the adjustable heat bath container 13 regulates the temperature of the target object by changing the temperature of the liquid it contains. The liquid in the adjustable heat bath container 13 can be water or oil, and this application does not limit it.

[0200] It should be understood that the shape and size of the adjustable hot bath container 13 need to be adapted to the placement of the sealed container 1, but this application does not impose any limitations on this.

[0201] In this embodiment, the adjustable heat bath container 13 contains the sealed container 1. When there are different testing requirements for different test environment temperatures, only the temperature of the adjustable heat bath container 13 needs to be adjusted.

[0202] It should be understood that the temperature adjustment method of the adjustable heat bath container 13 is not unique. For example, the temperature of the adjustable heat bath container 13 can be increased by heating, thereby raising the test environment temperature. Alternatively, a higher temperature liquid can be injected into the adjustable heat bath container 13 to raise the test environment temperature, or a lower temperature liquid can be injected to lower the test environment temperature; the specific method should be chosen based on actual needs.

[0203] In this embodiment, the sealed container 1 is placed in a temperature-adjustable heat bath container 13. By adjusting the temperature of the adjustable heat bath container 13, the test environment temperature is changed, thereby simulating the temperature conditions under different practical application scenarios or experimental research needs, thus realizing solubility testing under different test environment temperatures. Temperature is one of the factors affecting gas solubility. Using the adjustable heat bath container 13, testing can be carried out over a wider temperature range, broadening the applicability of the testing system and making the measurement results more comprehensive.

[0204] In this embodiment of the application, the ratio of the electrolyte volume to the volume of the sealed container 1 is less than or equal to 0.2.

[0205] It should be understood that by keeping the ratio of the electrolyte volume to the volume of the sealed container 1 within the range of less than or equal to 0.2, a relatively sufficient space can be reserved in the sealed container 1 for the existence and movement of the gas to be tested.

[0206] In this embodiment, when the gas to be tested is injected into the sealed container 1, the gas can fully contact the electrolyte in a large free space, diffuse more evenly, and dissolve in the electrolyte. If the electrolyte content is too large, making the gas space too small, the interaction between gas molecules and between the gas and the electrolyte will be restricted, which may easily lead to excessively high local gas concentration or uneven dissolution, thereby affecting the accuracy of gas solubility measurement.

[0207] In this embodiment, the volume ratio setting can also better simulate the gas-liquid distribution under these actual working conditions. By maintaining a similar volume ratio in the testing system, the measured gas solubility data has greater practical application value.

[0208] In this embodiment of the application, the sealed container 1 is the casing of the battery cell 100.

[0209] In this embodiment, the gas to be tested is the gas generated during the use of the battery cell 100. To enable the testing system to more accurately measure the solubility of the gas in the electrolyte, the casing of the battery cell 100 is used as a sealed container 1, which can better simulate the internal conditions of the battery cell 100. Since the material, structure, and internal spatial layout of the battery cell 100 casing are constructed based on the actual working environment and requirements of the battery cell 100, it can reproduce the real physical and chemical environment inside the battery cell 100 to the greatest extent, such as the internal pressure change characteristics and the interaction space between the electrolyte and electrode materials. When conducting gas solubility tests, the complex internal conditions of the battery cell 100 can be better simulated, thus laying a solid foundation for obtaining highly accurate and practically valuable solubility data.

[0210] According to some embodiments of this application, see Figures 2 to 16This application provides a testing system for the electrolyte solubility of a battery cell 100. The testing system may include a sealed container 1, a sealed liquid injection assembly 2, a gas source 3, a gas volume measuring device 4, and a flow controller 5. The sealed container 1 is the shell of the battery cell 100 and has a containing space. The sealed liquid injection assembly 2 is connected to the sealed container 1 and is used to inject a first volume of electrolyte into the sealed container 1. The first end of the flow controller 5 is connected to the gas source 3, and the second end of the flow controller 5 is connected to the sealed container 1. The gas source 3 is used to inject a second volume of the gas to be tested into the sealed container 1, and the flow controller 5 is used to control the gas flow rate and the injection time of the gas to be tested. The gas volume measuring device 4 is connected to the sealed container 1 and is used to measure the remaining volume of the gas to be tested after dissolving in the electrolyte. The gas volume measuring device 4 includes a first container 41 and a second container 42. The first container 41 is connected to the sealed container 1 and is filled with reagent. The gas to be tested is insoluble in the reagent. The second container 42 is connected to the first container 41 and is used to measure the volume of reagent discharged from the first container 41.

[0211] The testing system also includes a liquid extraction device 6, a liquid collection device 7, and a first valve 8. The first end of the first valve 8 is connected to the sealed container 1, and the second end of the first valve 8 is connected to the liquid extraction device 6. The liquid extraction device 6 is used to extract electrolyte from the sealed container 1 before the gas volume measuring device 4 measures the remaining volume. The first valve 8 opens after the electrolyte has dissolved the gas to be tested for a predetermined time. The liquid collection device 7 is connected to the liquid extraction device 6 and is used to collect the electrolyte extracted by the liquid extraction device 6.

[0212] The testing system also includes a vacuum pump 9 and a second valve 10. The first end of the second valve 10 is connected to the sealed container 1, and the second end of the second valve 10 is connected to the vacuum pump 9. The other two ends of the vacuum pump 9 are connected to the gas volume measuring device 4. The vacuum pump 9 is used to extract the remaining gas in the sealed container 1 after the gas to be tested has dissolved in the electrolyte. Furthermore, the vacuum pump 9 includes a vacuum pump, which evacuates the electrolyte solubility testing system to a vacuum state before the sealed liquid injection assembly 2 injects liquid.

[0213] The testing system also includes a four-way valve 11, a pressure detector 12, and an adjustable heat bath container 13. The first port of the four-way valve 11 is connected to a flow controller 5, the second port is connected to a sealing injection assembly 2, the third port is connected to a sealed container 1, and the fourth port is connected to the first end of a second valve 10. The pressure detector 12 is connected to the sealed container 1 and is used to measure the pressure inside the sealed container 1. The adjustable heat bath container 13 contains the sealed container 1 to regulate its temperature.

[0214] The testing system also includes a processor, which is used to determine a second volume based on the gas flow rate and injection time of the gas to be tested, and to determine the solubility of the gas to be tested in the electrolyte based on the first volume, the second volume, and the remaining volume.

[0215] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A system for testing electrolyte solubility for a battery cell (100), characterized by, The test system comprises: a sealed container (1) having a containing space; a sealed liquid injection assembly (2) connected with the sealed container (1) for injecting a first volume of electrolyte into the sealed container (1); a gas source (3) connected with the sealed container (1) for injecting a second volume of a gas to be tested into the sealed container (1); a gas volume measuring device (4) connected with the sealed container (1) for measuring the residual volume of the gas to be tested after the gas to be tested is dissolved in the electrolyte.

2. The test system of claim 1, wherein, The test system further comprises a processor for determining the solubility of the gas to be tested in the electrolyte according to the first volume, the second volume and the residual volume.

3. The test system of claim 2, wherein, The test system further comprises a flow controller (5) having a first end connected with the gas source (3) and a second end connected with the sealed container (1), the flow controller (5) being used for controlling the gas flow rate of the gas to be tested and the time of injecting the gas to be tested.

4. The test system of claim 1, wherein, The gas volume measuring device (4) comprises a first container (41) connected with the sealed container (1), the first container (41) being filled with a reagent, the gas to be tested being insoluble in the reagent.

5. The test system of claim 4, wherein, The gas volume measuring device (4) further comprises a second container (42) communicating with the first container (41), the second container (42) being used for measuring the volume of the reagent discharged from the first container (41).

6. The test system of claim 1, wherein, The test system further comprises a liquid pumping device (6) connected with the sealed container (1) for pumping the electrolyte in the sealed container (1) before the gas volume measuring device (4) measures the residual volume.

7. The test system of claim 6, wherein, The test system further comprises a liquid collecting device (7) connected with the liquid pumping device (6) for collecting the electrolyte pumped by the liquid pumping device (6).

8. The test system of claim 6, wherein, The test system comprises a first valve (8) having a first end connected with the sealed container (1) and a second end connected with the liquid pumping device (6), the first valve (8) being opened after the electrolyte reaches a predetermined time of dissolving the gas to be tested.

9. The test system of claim 1, wherein, The test system further comprises a gas pumping device (9) having a first end connected with the sealed container (1) and a second end connected with the gas volume measuring device (4), the gas pumping device (9) being used for pumping the residual gas in the sealed container (1) after the gas to be tested is dissolved in the electrolyte.

10. The test system of claim 9, wherein, The gas pumping device (9) comprises a vacuum pump, the test system being pumped to a vacuum state by the vacuum pump before the sealed liquid injection assembly (2) injects the liquid.

11. The test system of claim 9, wherein, The test system further comprises a second valve (10), a first end of the second valve (10) being connected with the sealed container (1), and a second end of the second valve (10) being connected with the air extractor (9).

12. The test system of claim 11, wherein, The test system further comprises a four-way valve (11), a first interface of the four-way valve (11) being connected with the air source (3), a second interface of the four-way valve (11) being connected with the sealed liquid injection assembly (2), a third interface of the four-way valve (11) being connected with the sealed container (1), and a fourth interface of the four-way valve (11) being connected with the first end of the second valve (10).

13. The test system of claim 3, wherein, The processor is configured to determine the second volume according to a gas flow rate of the to-be-tested gas injected and a time of injecting the to-be-tested gas.

14. The test system of claim 4, wherein, The reagent comprises water, sodium carbonate or carbon tetrachloride.

15. The test system of any one of claims 1 to 14, wherein, The test system further comprises an air pressure detector (12) connected with the sealed container (1) and configured to measure a pressure in the sealed container (1).

16. The test system of any one of claims 1 to 14, wherein, The test system further comprises an adjustable heat bath container (13) containing the sealed container (1) and configured to adjust a temperature of the sealed container (1).

17. The test system of any one of claims 1 to 14, wherein, A ratio of the electrolyte volume to a volume of the sealed container (1) is less than or equal to 0.

2.

18. The test system of any one of claims 1 to 14, wherein, The sealed container (1) is a shell of the battery cell (100).

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