Reaction gas collection system and battery testing system

Abstract

The application discloses a reaction gas collecting system and a battery testing system, relates to the technical field of battery production equipment, and discloses a reaction gas collecting system and a battery testing system, which belong to the technical field of battery production equipment. The reaction gas collecting system comprises a reaction kettle and a gas collecting device. The reaction kettle is provided with a reaction cavity which is configured to place materials. The gas collecting device is connected to the upper cover of the reaction kettle and is in communication with the reaction cavity. The gas collecting device is configured to collect the gas generated after the reaction of the materials in the reaction cavity. The application can improve the content of the collected gas, so as to solve the problem of the difficulty in characterizing low-content gas.

Description

Technical Field

[0001] This application relates to the field of battery production equipment technology, and in particular to a reaction gas collection system and a battery testing system. Background Technology

[0002] Electrochemical energy storage devices such as lithium-ion batteries are prone to thermal runaway reactions under overheating conditions, generating a large number of gaseous products. The compositional analysis and quantitative detection of these gaseous products are crucial for studying the thermal runaway mechanism and improving battery safety. Currently, differential scanning calorimetry (DSC) is commonly used to study the thermal behavior of electrode materials, determining the reaction temperature and heat of reaction by measuring changes in heat flow. For air-sensitive samples, DSC testing requires the use of a high-pressure sealed crucible and sample preparation in a glove box to isolate them from water and oxygen.

[0003] In related technologies, after perforating a high-pressure sealed crucible containing a sample inside a glove box, it is immediately transferred to a reaction cell. The reaction cell is then placed in a heating furnace for the experiment. After the experiment is completed, the released gas is collected for further characterization. However, because the high-pressure sealed crucible is small in volume, the amount of gas generated after the reaction is also small. The gas concentration decreases after the released gas overflows into the large-volume reaction cell, making it difficult to characterize low-content gas. Utility Model Content

[0004] In view of the above problems, this application provides a reaction gas collection system and a battery testing system, which aim to increase the content of collected gas to solve the problem of difficulty in characterizing low-content gas.

[0005] This application provides a reaction gas collection system, including a reaction vessel and a gas collection device; the reaction vessel is provided with a reaction chamber, which is configured to hold materials; the gas collection device is connected to the top cover of the reaction vessel and communicates with the reaction chamber, and is configured to collect the gas generated after the materials in the reaction chamber react.

[0006] In the technical solution of this application embodiment, a gas collection device is connected to the upper cover of the reactor to integrate the gas collection device into the reactor. During use, the material is first placed in the reaction chamber of the reactor, and then the reactor is placed in a heating device for heating to promote the reaction of the material in the reaction chamber. The gas generated during the reaction can be directly collected by the gas collection device, avoiding the gas from overflowing into the large-volume reaction tank, increasing the content of collected gas, and thus solving the problem of difficulty in characterizing low-content gas.

[0007] In some embodiments, an exhaust valve is provided on the outer side of the top cover, and a gas collection device is connected to the exhaust valve. The exhaust valve is configured to control the connection and disconnection between the reaction chamber and the gas collection device. This design allows the gas collection device to be installed on the reactor via the exhaust valve, and the connection and disconnection between the reaction chamber and the gas collection device can be flexibly controlled via the exhaust valve. During the reaction process, the connection between the reaction chamber and the gas collection device is first blocked by the exhaust valve to allow the material to react fully within the reaction chamber. After the reaction is complete, the connection between the reaction chamber and the gas collection device is then controlled by the exhaust valve to allow the gas in the reaction chamber to smoothly enter the gas collection device for collection.

[0008] In some embodiments, compared to using high-temperature resistant and explosion-proof materials to fabricate the gas collection device, this embodiment typically uses plastic to fabricate the gas collection device to reduce material costs. Therefore, by detachably connecting the gas collection device to the outlet valve, the gas collection device can be removed from the reactor before it is placed in the heating equipment for heating. After the reaction is complete and the reactor is removed from the heating equipment, the gas collection device can be reinstalled on the reactor for gas collection. Furthermore, this embodiment allows for flexible disassembly and replacement of the gas collection device according to experimental needs, thereby greatly improving the applicability and maintenance convenience of the equipment.

[0009] In some embodiments, the vent valve includes a valve body, a priming section, and a venting section; the valve body has an inlet end and an outlet end; the priming section is located at the inlet end, with one end of the priming section away from the valve body connected to one side of the top cover, and the priming section communicates with the reaction chamber; the venting section is located at the outlet end, and a gas collection device is connected to the end of the venting section away from the valve body, and the venting section communicates with the gas collection device; the valve body is configured to control the on / off state of the priming section and the venting section. This design allows for easy installation of the vent valve on the top cover of the reactor using the priming section, and also allows for easy installation of the gas collection device on the vent valve, thus facilitating convenient installation of the gas collection device through the vent valve.

[0010] In some embodiments, the gas collection device is provided with a gas extraction valve, which is configured to allow the gas extraction device to extract gas from the gas collection device. This design allows the gas extraction valve to seal the gas collection device to prevent gas leakage and enables the gas extraction device to smoothly extract gas from the gas collection device, thus achieving successful gas extraction.

[0011] In some embodiments, the gas sampling valve is a self-sealing diaphragm valve, and the outlet end of the self-sealing diaphragm valve is equipped with a sealing rubber plug. This design, using a self-sealing diaphragm valve, allows the experimenter to perform sampling operations using a gas sampling needle. The sampling needle is inserted into the sealing rubber plug, then passes through the self-sealing diaphragm valve to extract gas. After gas extraction is completed and the gas sampling needle is removed, the self-sealing diaphragm valve can automatically close to prevent gas leakage at the needle hole.

[0012] In some embodiments, the gas collection device has an outlet at the top, and a gas sampling valve is installed at the outlet. With this design, since the gas collected in the gas collection device typically rises, this embodiment allows the gas in the gas collection device to preferentially accumulate near the gas sampling valve by installing the gas sampling valve at the outlet at the top of the gas collection device, thus facilitating gas sampling by the gas sampling needle through the valve.

[0013] In some embodiments, the reactor further includes a bottom shell, and a top cover is detachably placed on the bottom shell and together with the bottom shell to form a reaction chamber. This design allows the top cover to be removed from the bottom shell before placing materials, leaving the top of the bottom shell open, thus facilitating the placement of materials into the bottom shell. Then, the top cover is closed to the bottom shell, allowing the materials to be contained within the sealed reaction chamber.

[0014] In some embodiments, a sealing ring is provided between the bottom shell and the top cover. This design allows the sealing ring to be installed on the top cover first, or on the bottom shell first, and then the top cover placed on top of the bottom shell during assembly. During installation, the sealing ring is subjected to axial compression by the bottom shell and the top cover to generate initial contact pressure, causing the sealing ring to fill the gap between the bottom shell and the top cover, thus sealing the gap and preventing leakage of gas generated during the reaction process.

[0015] In some embodiments, the sealing ring is a ceramic sealing ring. This design, because the entire reactor is at a high temperature during the heating reaction process in a heating device, improves the high-temperature resistance of the sealing ring by using a ceramic sealing ring to seal the top cover and bottom shell, thus avoiding the risk of affecting the service life of the sealing ring or even causing it to melt under high-temperature conditions.

[0016] This application also provides a battery testing system, including the aforementioned reaction gas collection system, a sealed chamber, and a heating device. When the reaction vessel is placed inside the sealed chamber, it is configured to place materials into the reaction chamber, and / or to collect the gases generated after the reaction of the materials in the reaction chamber via a gas collection device. When the reaction vessel is placed inside the heating device, it is configured to heat the materials inside the reaction vessel. This design, before the experiment, avoids the influence of external air and moisture on the reaction system by first placing the reaction vessel inside the sealed chamber and then adding materials to it. Furthermore, the gas collection device can be installed and removed inside the sealed chamber, and the gases generated after the reaction of the materials in the reaction chamber can be collected within the sealed chamber using the gas collection device. After placing the materials in the reactor, the reactor is transferred to a heating device to heat the reactor, thereby causing the materials in the reaction chamber to react and generate gas. Therefore, in this embodiment, a sealed box and a heating device are used to add materials and heat the reactor, respectively. This allows the use of a larger reactor as the reaction vessel for the materials, which can overcome the volume limitation of the high-pressure sealed crucible used in DSC testing, increase the amount of gas generated, and thus further increase the content of collected gas.

[0017] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an embodiment of the reaction gas collection system of this application; Figure 2 This is an exploded view of one embodiment of the reactive gas collection system of this application; Figure 3 This is an exploded view from another perspective of an embodiment of the reactive gas collection system of this application; Figure 4 This is an exploded view of yet another embodiment of the reactive gas collection system of this application; Figure 5 This is a partial structural schematic diagram of the reaction vessel in one embodiment of the reaction gas collection system of this application; Figure 6This is a schematic diagram of the gas intake valve in this application.

[0020] Explanation of icon numbers:

[0021] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0022] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein 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 specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0024] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0025] In this document, the term "embodiment" means that a particular 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 separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] In the description of the embodiments of this application, the term "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).

[0027] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0028] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0029] Electrochemical energy storage devices such as lithium-ion batteries are prone to thermal runaway reactions under overheating conditions, generating a large number of gaseous products. The compositional analysis and quantitative detection of these gaseous products are crucial for studying the thermal runaway mechanism and improving battery safety. Currently, differential scanning calorimetry (DSC) is commonly used to study the thermal behavior of electrode materials, determining the reaction temperature and heat of reaction by measuring changes in heat flow. For air-sensitive samples, DSC testing requires the use of a high-pressure sealed crucible and sample preparation in a glove box to isolate them from water and oxygen.

[0030] In related technologies, after perforating a high-pressure sealed crucible containing a sample inside a glove box, it is immediately transferred to a reaction cell. The reaction cell is then placed in a heating furnace for the experiment. After the experiment is completed, the released gas is collected for further characterization. However, because the high-pressure sealed crucible is small in volume, the amount of gas generated after the reaction is also small. The gas concentration decreases after the released gas overflows into the large-volume reaction cell, making it difficult to characterize low-content gas.

[0031] It should be noted that heat flux refers to the amount of heat passing through the surface of an object per unit time. In DSC testing, heat flux refers to the difference in heat flux between the sample and the reference material under programmed temperature control. It reflects the enthalpy change of the sample during temperature changes, such as the heat absorbed or released by the sample during melting or crystallization. By analyzing heat flux data, information such as the phase transition temperature and enthalpy of the sample can be obtained.

[0032] To address the aforementioned problems, this application proposes a reaction gas collection system 100, aiming to increase the collected gas content and solve the difficulty in characterizing low-content gases. The system will be described in detail below with reference to the accompanying drawings and embodiments.

[0033] Please see Figures 1 to 4 In one embodiment of this application, the reaction gas collection system 100 includes a reaction vessel 10 and a gas collection device 20; the reaction vessel 10 is provided with a reaction chamber 11, which is configured to hold materials; the gas collection device 20 is connected to the upper cover 14 of the reaction vessel 10 and communicates with the reaction chamber 11, and the gas collection device 20 is configured to collect the gas generated after the materials in the reaction chamber 11 react.

[0034] In this embodiment, the reaction vessel 10 serves as a reaction container for materials. These materials can be electrode materials from a battery, or other materials from a battery that require thermal runaway testing. Since materials may ignite or explode during thermal runaway reaction testing, the reaction vessel 10 needs to be made of high-temperature resistant and explosion-proof materials, such as stainless steel, nickel and nickel alloys, titanium, zirconium, etc. Optionally, the reaction vessel 10 can be cylindrical, prismatic, or other shapes. In some embodiments, to avoid the influence of air and moisture from the external environment on the reaction system, the reaction vessel 10 can be placed in a glove box protected by an inert gas before opening the reaction vessel 10 to place the materials into the reaction chamber 11.

[0035] The gas collection device 20 is used to collect the gas generated after the material reaction in the reaction chamber 11. The gas collection device 20 can be installed on the upper cover 14 of the reaction vessel 10 in a detachable manner or in a non-detachable manner. The specific design can be based on the high temperature resistance of the gas collection device 20. For example, when the gas collection device 20 is a non-high-temperature resistant structural component such as polyethylene or polypropylene, the gas collection device 20 is installed on the upper cover 14 of the reactor 10 using detachable methods such as threaded connection, snap-fit, or tenon and mortise connection. This allows the gas collection device 20 to be removed from the reactor 10 before it is placed in the heating equipment for heating. After the reaction is completed and the reactor 10 is removed from the heating equipment, the gas collection device 20 can be reinstalled on the upper cover 14 of the reactor 10 for gas collection. However, when the gas collection device 20 is a high-temperature resistant structural component such as stainless steel, nickel and nickel alloys, titanium, or zirconium, the gas collection device 20 is installed on the upper cover 14 of the reactor 10 using non-detachable methods such as welding or bonding, so that the gas collection device 20 can be placed in the heating equipment along with the reactor 10 for heating.

[0036] In summary, in the technical solution of this application embodiment, a gas collection device 20 is connected to the upper cover 14 of the reaction vessel 10 to integrate the gas collection device 20 into the reaction vessel 10. During use, the material is first placed in the reaction chamber 11 of the reaction vessel 10, and then the reaction vessel 10 is placed in a heating device for heating to promote the reaction of the material in the reaction chamber 11. The gas generated during the reaction can be directly collected through the gas collection device 20, avoiding the gas from overflowing into the large-volume reaction pool, increasing the content of collected gas, and thus solving the problem of difficulty in characterizing low-content gas.

[0037] Furthermore, since this application uses a large-volume reactor 10 as the reaction vessel, it can overcome the volume limitation of the high-pressure sealed crucible used in DSC testing, thereby increasing the amount of gas generated and further increasing the amount of gas collected.

[0038] Please see Figures 1 to 5 In one embodiment of this application, an exhaust valve 12 is provided on the outer side of the upper cover 14, and a gas collection device 20 is connected to the exhaust valve 12. The exhaust valve 12 is configured to control the opening and closing of the reaction chamber 11 and the gas collection device 20.

[0039] The vent valve 12, also known as an exhaust valve, can be a cylinder-type exhaust valve, a float-type exhaust valve, a float-lever-type exhaust valve, etc. The vent valve 12 can be detachably installed on the reactor 10 using threaded connections, snap-fit ​​connections, or mortise and tenon joints, or it can be non-detachably installed on the upper cover 14 of the reactor 10 using welding or bonding. Similarly, the gas collection device 20 can be detachably installed on the vent valve 12 using threaded connections, snap-fit ​​connections, or mortise and tenon joints, or it can be non-detachably installed on the vent valve 12 using welding or bonding.

[0040] With this design, the gas collection device 20 can be installed on the upper cover 14 of the reactor 10 via the vent valve 12. The connection between the reaction chamber 11 and the gas collection device 20 can be flexibly controlled via the vent valve 12. When the material in the reaction chamber 11 is reacting, the connection between the reaction chamber 11 and the gas collection device 20 is first blocked by the vent valve 12 so that the material can react fully in the reaction chamber 11. After the reaction is completed, the connection between the reaction chamber 11 and the gas collection device 20 is controlled by the vent valve 12 so that the gas in the reaction chamber 11 can smoothly enter the gas collection device 20 for gas collection.

[0041] Please see Figures 1 to 5 In one embodiment of this application, the gas collection device 20 is detachably connected to the gas outlet valve 12.

[0042] The gas collection device 20 can be detachably connected in ways including but not limited to threaded connection, snap-fit, mortise and tenon joint connection, etc.

[0043] Compared to using high-temperature resistant and explosion-proof materials to fabricate the gas collection device 20, this embodiment typically uses plastic to fabricate the gas collection device 20 to reduce material costs. Therefore, by detachably connecting the gas collection device 20 to the outlet valve 12, the gas collection device 20 can be removed from the reactor 10 before it is placed in the heating equipment for heating. After the reaction is complete and the reactor 10 is removed from the heating equipment, the gas collection device 20 can be reinstalled on the reactor 10 for gas collection. Furthermore, this embodiment allows for flexible disassembly and replacement of the gas collection device 20 according to experimental needs, thereby greatly improving the applicability and maintenance convenience of the equipment.

[0044] Please see Figure 5 In one embodiment of this application, the exhaust valve 12 includes a valve body 121, an exhaust section 122, and an exhaust section 123. The valve body 121 has an inlet end and an outlet end. The exhaust section 122 is located at the inlet end, and the end of the exhaust section 122 away from the valve body 121 is connected to one side of the upper cover 14. The exhaust section 122 is connected to the reaction chamber 11. The exhaust section 123 is located at the outlet end, and the gas collection device 20 is connected to the end of the exhaust section 123 away from the valve body 121. The exhaust section 123 is connected to the gas collection device 20. The valve body 121 is configured to control the opening and closing of the exhaust section 122 and the exhaust section 123.

[0045] The valve body 121 can switch between on and off states to control the flow between the induced gas section 122 and the induced gas section 123, thereby controlling the flow between the reaction chamber 11 and the gas collection device 20. The induced gas section 122 is used to guide the gas in the reaction chamber 11 to the valve body 121, and the induced gas section 123 can guide the gas flowing through the valve body 121 to the gas collection device 20. Optionally, the induced gas section 122 and the induced gas section 123 can be integrally formed with the valve body 121, or they can be connected together by means of threaded connection, welding, etc.

[0046] This design allows for the use of an air intake section 122 to facilitate the installation of the gas outlet valve 12 on the upper cover 14 of the reactor 10, and an air outlet section 123 to facilitate the installation of the gas collection device 20 on the gas outlet valve 12, thus enabling convenient installation of the gas collection device 20 through the gas outlet valve 12.

[0047] In some embodiments, the gas outlet section 123 is provided with a gas outlet hole, and the gas collection device 20 can be detachably installed on the gas outlet section 123 so that the gas collection device 20 communicates with the gas outlet hole of the gas outlet section 123.

[0048] Please see Figure 1 , Figure 2 In one embodiment of this application, the gas collection device 20 is provided with a gas extraction valve 21, which is configured to allow the gas extraction device to extract gas from the gas collection device 20.

[0049] The gas extraction valve 21 is installed at the gas outlet 22 of the gas collecting device 20 to close the gas outlet 22. The gas extraction valve 21 is used in conjunction with a gas extraction device to allow the device to extract gas from the gas collecting device 20. For example, if the device is a sampling needle, the needle can pass directly through the valve 21 to extract gas, or the gas can be extracted through the sampling needle while the valve 21 is open. Optionally, the gas extraction valve 21 can be installed at the top, side, or bottom of the gas collecting device 20, as long as it allows the gas extraction device to extract gas from the device.

[0050] With this design, the gas extraction valve 21 can be used to seal the gas collection device 20 to prevent gas leakage from the gas collection device 20, and to allow the gas extraction device to smoothly extract the gas from the gas collection device 20, so as to achieve smooth gas extraction.

[0051] Please see Figure 6 In one embodiment of this application, the air intake valve 21 is a self-sealing diaphragm valve, and the air outlet end of the self-sealing diaphragm valve is provided with a sealing rubber plug 211.

[0052] A self-sealing diaphragm valve is a special type of shut-off valve. Its core design relies on a diaphragm made of soft material to achieve a seal, completely separating the inner cavity of the valve body 121 from the inner cavity of the valve cover and the drive components. When the valve is closed, the diaphragm is compressed and tightly adheres to the valve seat, forming a barrier with no dead angles. When open, the diaphragm is displaced upward by the drive mechanism (manual, pneumatic, or electric), allowing fluid to flow smoothly through the streamlined channel. The elastic restoring force of the diaphragm ensures a tight seal when closed. The sealing plug 211 can be a silicone plug, rubber plug, or other structural components.

[0053] This design, employing a self-sealing diaphragm valve, allows researchers to use a gas sampling needle for sampling. The sampling needle is inserted into the sealing plug 211 and then passes through the self-sealing diaphragm valve to extract gas. After the gas sampling is completed and the sampling needle is removed, the self-sealing diaphragm valve automatically closes to prevent gas leakage at the needle hole.

[0054] Please see Figure 1 , Figure 2 In one embodiment of this application, the gas collection device 20 is provided with an outlet 22 at the top, and the gas valve 21 is installed at the outlet 22.

[0055] The gas valve 21 is provided with a gas hole 212, which is connected to the gas outlet 22. The experimenter can use a gas sampling needle to insert into the sealing rubber plug 211 and into the gas hole 212 to extract gas from the gas outlet 22 through the gas hole 212.

[0056] Since the gas collected in the gas collection device 20 usually rises, this embodiment installs the gas sampling valve 21 at the gas outlet 22 at the top of the gas collection device 20, which allows the gas in the gas collection device 20 to preferentially gather near the gas sampling valve 21, thus facilitating the gas sampling needle to sample gas through the gas sampling valve 21.

[0057] In practical applications, the air intake valve 21 can be directly inserted into the air outlet 22, or it can be installed in the air outlet 22 by means of adhesive bonding, screw connection, snap-fit, or other methods, or it can be installed on the outside of the air outlet 22.

[0058] Please see Figures 2 to 4 In one embodiment of this application, the reactor 10 further includes a bottom shell 13, and a top cover 14 is detachably disposed on the bottom shell 13 and surrounds the bottom shell 13 to form a reaction chamber 11.

[0059] The bottom shell 13 is a hollow structure with an open top, and the top cover 14 can be a plate-like structure. The top cover 14 covers the open side of the bottom shell 13 so that the top cover 14 and the bottom shell 13 together define the reaction chamber 11. Alternatively, both the bottom shell 13 and the top cover 14 can be hollow structures with one side open, and the open side of the top cover 14 covers the open side of the bottom shell 13. Optionally, the top cover 14 can be detachably mounted on the bottom shell 13 using a threaded connection, snap-fit ​​connection, mortise and tenon structure connection, or other detachable methods.

[0060] With this design, before placing the material, the top cover 14 can be removed from the bottom shell 13 so that the top of the bottom shell 13 is open, making it easier to put the material into the bottom shell 13. Then the top cover 14 is closed to the bottom shell 13 so that the material is contained in the closed reaction chamber 11.

[0061] Please see Figures 2 to 4 In one embodiment of this application, a sealing ring 15 is provided between the bottom shell 13 and the top cover 14.

[0062] With this design, during assembly, the sealing ring 15 can be installed on the upper cover 14 first, or the sealing ring 15 can be installed on the bottom shell 13 first, and then the upper cover 14 can be placed on the bottom shell 13. During installation, the sealing ring 15 is subjected to axial compression by the bottom shell 13 and the upper cover 14 to generate initial contact pressure, so that the sealing ring 15 fills the gap between the bottom shell 13 and the upper cover 14 to seal the gap between the bottom shell 13 and the upper cover 14, thereby preventing the leakage of gas generated by the material in the reaction chamber 11 during the reaction process.

[0063] Please see Figures 2 to 4 In one embodiment of this application, the sealing ring 15 may be a ceramic sealing ring.

[0064] With this design, since the reactor 10 is placed in the heating equipment for the heating reaction process, the entire reactor 10 is in a high temperature state. Since ceramic materials have high temperature resistance, this embodiment uses a ceramic sealing ring to seal the top cover 14 and the bottom shell 13, which can improve the high temperature resistance of the sealing ring 15 and avoid the risk of affecting the service life of the sealing ring 15 or even causing the sealing ring 15 to melt in a high temperature environment.

[0065] This application also proposes a battery testing system, which includes a reaction gas collection system 100, a sealed box, and a heating device. The specific structure of the reaction gas collection system 100 is as described in the above embodiments. Since this wiping device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0066] When the reactor 10 is placed in a sealed box, it is configured to place materials into the reaction chamber 11, and / or to collect the gas generated after the reaction of the materials in the reaction chamber 11 by the gas collection device 20; when the reactor 10 is placed in a heating device, it is configured to heat the materials in the reactor 10.

[0067] Understandably, before the experiment, to avoid the influence of external air and moisture on the materials—for example, oxygen and excessive moisture in the air can cause the decomposition of lithium salts in the electrolyte, corroding and damaging the positive and negative electrode materials—the reaction vessel 10 is placed in a sealed box before the materials are added. A gas collection device 20 can also be installed and removed within the sealed box to collect the gas generated after the reaction in the reaction chamber 11. After placing the materials in the reaction vessel 10, it is transferred to a heating device to heat it, thus promoting the reaction and gas generation within the reaction chamber 11. Therefore, this embodiment uses a sealed box and a heating device to add materials and heat the reaction vessel 10 respectively, allowing for the use of a larger reaction vessel 10 as the reaction container. This overcomes the volume limitations of the high-pressure sealed crucible used in DSC testing, increasing the amount of gas generated and further enhancing the collected gas content.

[0068] In some embodiments, the sealed enclosure may be a glove box with inert gas protection. The heating device may be a heating furnace.

[0069] In some embodiments, the experimental procedure may include the following steps: First, place the reactor 10 in a sealed box. Then, open the top cover 14 of the reactor 10 in the sealed box, accurately weigh the pre-prepared electrode materials and other reaction materials, and place them in the reaction chamber 11 to ensure uniform distribution of the reactants. Subsequently, tighten the top cover 14 and the bottom shell 13 with threads to ensure the airtightness of the system during the reaction. After sealing, remove the assembled reactor 10 from the sealed box and prepare for the heating experiment. Place the sealed reactor 10 in a programmable temperature controlled heating furnace and set the heating program as follows: heat from room temperature to the final experimental temperature at a rate of 10℃ / min, and maintain the temperature at the target temperature for 3 hours to ensure the reaction proceeds fully. After the reaction, the reactor 10 enters the cooling stage. After the temperature drops to a safe range, place the reactor 10 in a sealed box, tighten and seal the gas collection device 20 and the gas outlet valve 12 on the reactor 10, and control the gas flow through the gas outlet valve 12 to guide the gas generated by the reaction into the gas collection device 20; then, use a gas sampling needle to sample through the self-sealing diaphragm valve, and the collected gas can be further analyzed by means of gas chromatography (GC), mass spectrometry (MS) or infrared spectroscopy (IR) to study the reaction mechanism or evaluate the reaction efficiency.

[0070] The above description is merely an exemplary embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the technical concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A reactive gas collection system, characterized in that, include: A reaction vessel, provided with a reaction chamber, the reaction chamber being configured to hold materials; A gas collection device is connected to the top cover of the reactor and communicates with the reaction chamber. The gas collection device is configured to collect the gas generated after the material reaction in the reaction chamber.

2. The reaction gas collection system as described in claim 1, characterized in that, An exhaust valve is provided on the outer side of the top cover, and the gas collection device is connected to the exhaust valve. The exhaust valve is configured to control the connection and disconnection between the reaction chamber and the gas collection device.

3. The reaction gas collection system as described in claim 2, characterized in that, The gas collection device is detachably connected to the gas outlet valve.

4. The reaction gas collection system as described in claim 2, characterized in that, The outlet valve includes: Valve body; An air intake section is provided at the air inlet end of the valve body, and the end of the air intake section away from the valve body is connected to one side of the upper cover. The air intake section is in communication with the reaction chamber. An outlet section is provided at the outlet end of the valve body, and the gas collection device is connected to the end of the outlet section away from the valve body. The outlet section is in communication with the gas collection device. The valve body is configured to control the opening and closing of the priming section and the outlet section.

5. The reaction gas collection system according to any one of claims 1 to 4, characterized in that, The gas collection device is equipped with a gas extraction valve, which is configured to allow the gas extraction device to extract gas from the gas collection device.

6. The reaction gas collection system as described in claim 5, characterized in that, The air intake valve is a self-sealing diaphragm valve, and the air outlet end of the self-sealing diaphragm valve is provided with a sealing rubber plug.

7. The reaction gas collection system as described in claim 5, characterized in that, The gas collection device is provided with an outlet at the top, and the gas valve is installed at the outlet.

8. The reaction gas collection system according to any one of claims 1 to 4, characterized in that, The reactor also includes a bottom shell, and the top cover is detachably placed on the bottom shell and together with the bottom shell to form the reaction chamber.

9. The reaction gas collection system as described in claim 8, characterized in that, A sealing ring is provided between the bottom shell and the top cover.

10. The reaction gas collection system as described in claim 9, characterized in that, The sealing ring is a ceramic sealing ring.

11. A battery testing system, characterized in that, include: The reaction gas collection system as described in any one of claims 1 to 10; A sealed box, wherein when the reactor is placed inside the sealed box, it is configured to place materials into the reaction chamber, and / or to collect the gases generated after the materials in the reaction chamber react through the gas collection device; A heating device, wherein when the reactor is placed in the heating device, it is configured to heat the materials inside the reactor.

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