A high-efficiency helium detection device

Abstract

The utility model discloses a kind of high-efficiency helium detection devices, it is related to battery production technical field, including the sealed box for placing battery, matching installation is sealed cover on sealed box, still include with the controllable intercommunication of sealed sealed box detector component and with the controllable intercommunication of battery circulation component, circulation system includes separation system, nitrogen supply system and helium supply system, the input end of separation system is controllably interconnected with battery, the input end of nitrogen supply system and helium supply system is controllably interconnected with separation system output respectively, the output of nitrogen supply system and helium supply system is controllably interconnected with battery. By circulation system to battery inside vacuum extraction, helium injection, nitrogen injection vacuum breaking and recovery separation helium, helium is recycled, reduce the influence to environment, to improve detection effect, and save cost, protect environment.

Description

Technical Field

[0001] This utility model belongs to the field of battery production technology, and specifically relates to a high-efficiency helium detection device. Background Technology

[0002] In battery manufacturing, after the casing and electrolyte filling hole of a prismatic lithium battery are laser-welded, helium gas testing is required to ensure airtightness and safety. The principle of helium testing is based on its unique physical properties: helium molecules are only 0.26 nm in diameter, allowing them to penetrate micron-sized leaks; and they are chemically inert, not reacting with internal battery materials, making them an ideal tracer gas. When helium is added to the battery, if a leak exists, the helium will escape. A helium mass spectrometer leak detector can accurately detect the leakage amount, thus determining the battery's sealing performance. This testing is a crucial step in safe battery production, effectively preventing risks such as electrolyte leakage and internal gas explosions, ensuring battery reliability in energy storage and power applications.

[0003] Traditional helium detection devices have significant technical drawbacks: on the one hand, helium is easily released into the environment during the detection process, leading to an increase in the helium concentration in the surrounding space, causing the leak detector to misjudge and affecting the detection accuracy; on the other hand, helium resources are scarce and extraction costs are high, and traditional processes cannot separate and recover the gas after detection, resulting in direct emission, which wastes resources and increases production costs. Utility Model Content

[0004] In view of the problems mentioned in the background art, the purpose of this utility model is to provide a high-efficiency helium detection device to solve the problems mentioned in the background art.

[0005] The above-mentioned technical objective of this utility model is achieved through the following technical solution:

[0006] A high-efficiency helium detection device includes a sealed box for holding a battery, a sealing cover fitted onto the sealed box, a detection instrument assembly controllably connected to the sealed box, and a circulation system controllably connected to the battery. The circulation system includes a separation system, a nitrogen supply system, and a helium supply system. The input of the separation system is controllably connected to the battery, the inputs of the nitrogen supply system and the helium supply system are controllably connected to the output of the separation system, and the outputs of the nitrogen supply system and the helium supply system are both controllably connected to the battery.

[0007] After the sealing cover and sealing box are installed, the sealing box is sealed. The detection component has the function of evacuating the sealing box and detecting the helium inside. The circulation system has the functions of evacuating the battery, injecting helium, breaking the vacuum, and separating and circulating helium. The detection component evacuates the sealing box, and the separation system evacuates the battery simultaneously. After the evacuation, the helium supply system injects helium into the battery. If there is a leak in the battery, helium will enter the sealing box from the leak point and be detected by the detector. After the detection is completed, the nitrogen supply system injects nitrogen into the battery to break the vacuum, and then extracts the gas from the battery and sends it to the separation system. The separation system separates the nitrogen and helium and sends them to the nitrogen supply system and helium supply system respectively for recycling. The helium is not naturally emitted in the traditional mode, but is absorbed by the circulation system, avoiding false detections caused by high concentrations of helium in the air, and allowing the helium to be recycled, protecting the environment and avoiding waste.

[0008] Preferably, the detector assembly is connected to the sealed box via interface one installed on the sealing cover, and the circulation system is connected to the battery via interface two installed on the sealing cover.

[0009] With Interface 1 and Interface 2 installed on the sealing cover, after the sealing cover is placed on the sealing box, Interface 2 can be directly inserted into the battery, and Interface 1 can be directly connected to the sealing box, making operation convenient.

[0010] Preferably, the separation system includes a first storage tank, a gas membrane separator, and a concentration meter. The input end of the gas membrane separator is controllably connected to the battery. The helium output end and nitrogen output end of the gas membrane separator are controllably connected to the nitrogen supply system and the concentration meter, respectively. The output end of the concentration meter is controllably connected to the first storage tank and the helium supply system. The output end of the first storage tank is controllably connected to the concentration meter and the gas membrane separator, respectively.

[0011] The gas membrane separator is used to evacuate and extract the nitrogen-helium mixture from the battery and separate it. The separated nitrogen and helium are then output to the nitrogen supply system and the helium supply system, respectively.

[0012] Preferably, the separation system further includes a first storage tank and a concentration meter. The first storage tank and the helium supply system are respectively controllably connected to the output end of the concentration meter, and the input end and output end of the first storage tank are respectively controllably connected to the concentration meter and the gas membrane separator.

[0013] Before entering the helium supply system, the nitrogen enters the concentration meter. If the concentration meter detects that the nitrogen concentration is not up to standard, the channel between the concentration meter and the first storage tank is opened, and the nitrogen is guided into the first storage tank for temporary storage. Then it is sent back to the gas membrane separator for separation again. If the concentration meter detects that the concentration is up to standard, the helium is sent to the helium supply system.

[0014] Preferably, the gas membrane separator contains a helium separation membrane for separating helium and nitrogen and a vacuum pump.

[0015] Helium separation membrane is a functional thin film material used to separate helium from a gas mixture. Due to its small molecular size and low polarity, helium dissolves and diffuses faster in the membrane material than N2, thus preferentially permeating the membrane and achieving separation from other gases; vacuum pumps are used to create a vacuum inside the battery.

[0016] Preferably, the nitrogen supply system includes a second storage tank, the input end of which is connected to the nitrogen output end of the gas membrane separator, and the output end of the second storage tank is controllably connected to the battery.

[0017] The nitrogen separated by the gas membrane separator is transported to the second storage tank. After leak detection is completed, the pipeline between the second storage tank and the battery is opened to break the vacuum.

[0018] Preferably, the helium supply system includes a third storage tank, the input end of which is connected to the output end of the concentration meter, and the output end of which is controllably connected to the battery.

[0019] After separation, the helium gas with the correct concentration is transported to the third storage tank. After the vacuuming step is completed, the channel between the third storage tank and the battery is opened, and helium gas is injected into the battery for leak detection. Helium is a good leak detection gas due to its small size and low polarity.

[0020] Preferably, the detection instrument assembly includes a helium detector and a vacuum pump, both of which are controllably connected to a sealed enclosure.

[0021] The vacuum pump is used to evacuate the sealed box after it has been sealed. After helium is filled in, the helium detector checks the helium content in the sealed box to determine whether there is a helium leak and whether the battery is qualified.

[0022] Preferably, a vacuum nozzle with a multi-layer sealing structure is installed on the sealing cap, and the vacuum nozzle is sealed and connected to the battery's liquid filling hole.

[0023] The vacuum nozzle achieves zero-leakage connection with the injection hole through the dual action of elastic deformation and negative pressure adsorption. When the sealing cap descends and the sealing box closes, the injection hole can be sealed, which is highly efficient and does not require additional injection hole sealing operation, thus ensuring the accuracy of leak detection.

[0024] Preferably, it also includes a linear drive assembly and a switching assembly. At least two output terminals of the switching assembly are equipped with sealing boxes, and the sealing cover is installed on the output terminal of the linear drive assembly. When the switching assembly moves the sealing box to directly below the sealing cover, the linear drive assembly drives the sealing cover to press down.

[0025] The switching component adds a detection station and a loading station, allowing loading and detection to be carried out simultaneously, saving time and increasing efficiency. The linear drive component automatically drives the lifting and lowering of the sealing cover, thereby automatically completing the sealing and leak detection work of the sealing box. The whole process is highly automated and efficient.

[0026] This invention proposes a high-efficiency helium detection device that uses a circulation system to evacuate the battery, inject helium, inject nitrogen to break the vacuum, and recover and separate the helium. The helium is reused, reducing the impact on the environment, thereby improving the detection effect, saving costs, and protecting the environment.

[0027] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0028] Figure 1 This is a structural diagram of a high-efficiency helium detection device proposed in this utility model;

[0029] Figure 2 This is a structural diagram of the linear drive assembly and switching assembly of a high-efficiency helium detection device proposed in this utility model;

[0030] Figure 3 This is a structural diagram of the sealing cover and sealing box of a high-efficiency helium detection device proposed in this utility model;

[0031] Figure 4 This is a structural diagram of the circulation system of a high-efficiency helium detection device proposed in this utility model.

[0032] Reference numerals: 1. Workbench; 2. Clamping cylinder; 3. Linear guide rail; 4. Swing cylinder; 5. Platform; 6. Sealing box; 7. Sealing cover; 71. Interface 1; 72. Interface 2; 8. Detector assembly; 9. Circulation system; 90. Solenoid valve; 91. Separation system; 911. First storage tank; 912. Gas membrane separator; 913. Concentration meter; 92. Nitrogen supply system; 921. Second storage tank; 922. Backup nitrogen tank; 93. Helium supply system; 931. Backup helium tank; 932. Third storage tank. Detailed Implementation

[0033] The embodiments of this utility model are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0034] Example 1

[0035] refer to Figures 1 to 4The high-efficiency helium detection device described in this embodiment includes a linear drive assembly and a switching assembly. Sealing boxes 6 are installed on at least two output ends of the switching assembly, and sealing covers 7 are installed on the output ends of the linear drive assembly. When the switching assembly moves the sealing boxes 6 to directly below the sealing covers 7, the linear drive assembly drives the sealing covers 7 to press down. After the sealing covers 7 are matched and installed with the sealing boxes 6, they seal the sealing boxes 6.

[0036] A sealing ring is installed on the inner ring of the sealing cover 7, and the sealing cover 7 and the sealing box 6 are sealed together by the sealing ring to enhance the sealing effect.

[0037] The switching component adds a detection station and a loading station. The detection station is located below the sealing cover 7, while the other positions are loading stations. Loading and detection are carried out simultaneously, saving time and increasing efficiency. The linear drive component automatically drives the lifting and lowering of the sealing cover 7, thereby automatically completing the sealing and leak detection work of the sealing box 6. The whole process is highly automated and efficient.

[0038] Preferably, the system includes a workbench 1, a switching assembly, and a linear drive assembly, all mounted on the workbench 1. The switching assembly includes a swing cylinder 4, with a platform 5 symmetrically mounted on the output end of the swing cylinder 4. Both ends of the platform 5 are fixedly connected to a set of sealing boxes 6. The swing cylinder 4 drives the platform 5 to rotate 180° clockwise or counterclockwise, switching between the loading area and the inspection area. The linear drive assembly is located on one side of the inspection area. The linear drive assembly includes a clamping cylinder 2, a linear guide rail 3, and a connecting plate. The linear guide rail 3 is parallel to the clamping cylinder 2 and perpendicular to the platform 5. The output end of the linear guide rail 3 and the linear guide rail 3 are both fixedly connected to the connecting plate. The connecting plate is fixedly connected to the sealing cover 7. The clamping cylinder 2 drives the sealing cover 7 to rise and fall above the sealing box 6 in the inspection area.

[0039] The sealing cover 7 is equipped with interface 1 71 and interface 2 72. Interface 1 71 is connected to the sealing box 6, and interface 2 72 extends into the sealing box 6. When the sealing cover 7 and the sealing box 6 are closed, interface 2 72 is inserted into the battery. Interface 1 71 is controllably connected to the detector assembly 8 through a pipe equipped with a solenoid valve 90, and interface 2 72 is controllably connected to the circulation system 9 through a pipe equipped with a solenoid valve 90.

[0040] The circulation system 9 includes a separation system 91, a nitrogen supply system 92, and a helium supply system 93. The input end of the separation system 91 is controllably connected to the battery through a pipe equipped with a solenoid valve 90. The input ends of the nitrogen supply system 92 and the helium supply system 93 are controllably connected to the output end of the separation system 91 through pipes equipped with solenoid valves 90, respectively. The output ends of the nitrogen supply system 92 and the helium supply system 93 are both controllably connected to the battery through pipes equipped with solenoid valves 90.

[0041] The separation system 91 includes a gas membrane separator 912. The input end of the gas membrane separator 912 is controllably connected to the inside of the battery through a pipe equipped with a solenoid valve 90. The helium output end of the gas membrane separator 912 is connected to the nitrogen supply system 92. The nitrogen output end of the gas membrane separator 912 is controllably connected to the helium supply system 93 through a pipe equipped with a solenoid valve 90.

[0042] Preferably, the separation system 91 further includes a first storage tank 911 and a concentration meter 913. The first storage tank 911 and the helium supply system 93 are respectively controllably connected to the output end of the concentration meter 913 through a pipeline equipped with a solenoid valve 90. The input end and the output end of the first storage tank 911 are respectively controllably connected to the concentration meter 913 and the gas membrane separator 912 through a pipeline equipped with a solenoid valve 90.

[0043] The concentration meter 913 tests the separated helium gas. Helium gas that fails the test is re-entered into the gas membrane separator 912 through the first storage tank 911 for further separation to ensure the helium gas concentration meets the required standards.

[0044] The gas membrane separator 912 contains a helium separation membrane for separating helium and nitrogen, and a vacuum pump. The gas membrane separator 912 has the function of recovering internal gases from the battery and separating helium and nitrogen; the vacuum pump is used to create a vacuum inside the battery.

[0045] The nitrogen supply system 92 includes a second storage tank 921. The input end of the second storage tank 921 is connected to the nitrogen output end of the gas membrane separator 912, and the output end of the second storage tank 921 is controllably connected to the battery through a pipe equipped with a solenoid valve 90. The separated nitrogen gas directly enters the storage tank 921 for storage.

[0046] Preferably, the nitrogen supply system 92 further includes a backup nitrogen tank 922, which is controllably connected to the second storage tank 921 via a pipe equipped with a solenoid valve 90. The backup nitrogen tank 922 is used to store excess nitrogen.

[0047] The helium supply system 93 includes a third storage tank 932. The input end of the third storage tank 932 is controllably connected to the output end of the concentration meter 913 through a pipe equipped with a solenoid valve 90. The output end of the third storage tank 932 is controllably connected to a battery.

[0048] Preferably, the helium supply system 93 further includes a backup helium tank 931, which is controllably connected to the third storage tank 932 via a pipe equipped with a solenoid valve 90. The backup helium tank 931 is used to store excess helium.

[0049] The detector assembly 8 includes a helium detector and a vacuum pump, both of which are controllably connected to interface 71 on the sealing cover 7 via a pipe equipped with a solenoid valve 90.

[0050] A vacuum nozzle with a multi-layer sealing structure is installed on the sealing cover 7. The vacuum nozzle is coupled to the battery's liquid injection hole in an end-face sealing manner.

[0051] Preferably, the vacuum nozzle adopts a multi-layer sealing structure. The radial deformation of the elastic sealing material, such as fluororubber, fills the gap around the injection hole. At the same time, the vacuum adsorption force makes the nozzle end face fit tightly against the injection hole plane, achieving airtight sealing. The combined effect of elastic deformation and negative pressure adsorption achieves zero-leakage connection with the injection hole.

[0052] Work steps:

[0053] 1. Place the battery into the sealed box 6 in the loading area away from the sealing cover 7. Start the swing cylinder 4. The swing cylinder 4 drives the platform 5 to rotate 180° clockwise or counterclockwise to the detection area. The clamping cylinder 2 drives the connecting plate to descend, thereby driving the sealing cover 7 to descend and match and seal with the sealed box 6. At this time, the vacuum nozzle adsorbs and matches with the liquid injection hole to seal the battery. Interface 1 71 connects the detector assembly 8 and the inside of the sealed box 6. Interface 2 72 is inserted into the battery to connect the circulation system 9 with the inside of the battery.

[0054] 2. The vacuum pump of the detector assembly 8 and the vacuum pump of the gas membrane separator 912 respectively evacuate the sealed box 6 and the battery. After the operation is completed, the solenoid valve 90 between the detector assembly 8 and the sealed box 6 is closed, and the solenoid valve 90 between the gas membrane separator 912 and the battery is closed.

[0055] 3. The solenoid valve 90 between the first storage tank 911 and the battery is opened, and the first storage tank 911 injects helium into the battery and maintains it for a period of time to allow the helium to fully penetrate. If there is a leak in the battery, the helium will escape from the leak point into the sealed box 6. After the gas injection is closed, the solenoid valve is closed.

[0056] IV. The solenoid valve 90 between the detector assembly 8 and the sealed box 6 is reopened to start detecting the amount of helium leakage in the sealed box 6 and to determine whether the battery is leaking and the extent of the leakage.

[0057] 5. After the test is completed, open the solenoid valve 90 between the battery and the gas membrane separator 912 to deliver the gas extracted from the battery to the gas membrane separator 912. In the gas membrane separator 912, helium and nitrogen are separated. Before entering the helium supply system 93, the helium enters the concentration meter 913. If the concentration meter 913 detects that the nitrogen concentration is not up to standard, the channel between the concentration meter 913 and the first storage tank 911 is opened to guide the nitrogen into the first storage tank 911 for temporary storage. The nitrogen is then delivered to the second storage tank 921 for storage, realizing gas recycling. The solenoid valve 90 between the second storage tank 921 and the battery is opened to inject nitrogen into the battery to break the vacuum.

[0058] 6. The clamping cylinder 2 drives the sealing cover 7 to separate from the sealing box 6, and the swing cylinder 4 rotates 180° again to rotate the sealing box 6 containing the battery to the loading position for unloading and loading.

[0059] It should be understood that the terms "length", "thickness", "upper", "lower", "inner", "outer", "axial", "circumferential", etc., 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 this utility model and simplifying the description, and do not indicate or imply that the device or element 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 this utility model.

[0060] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0061] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0062] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0063] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A high-efficiency helium detection device, comprising a sealed box (6) for holding a battery, wherein a sealing cover (7) is fitted onto the sealed box (6), characterized in that: It also includes a detector assembly (8) controllably connected to a sealed enclosure (6) and a circulation system (9) controllably connected to a battery. The circulation system (9) includes a separation system (91), a nitrogen supply system (92) and a helium supply system (93). The input of the separation system (91) is controllably connected to the battery. The inputs of the nitrogen supply system (92) and the helium supply system (93) are controllably connected to the output of the separation system (91), respectively. The outputs of the nitrogen supply system (92) and the helium supply system (93) are both controllably connected to the battery.

2. The high-efficiency helium detection device according to claim 1, characterized in that: The detector assembly (8) is connected to the sealed box (6) via interface one (71) installed on the sealing cover (7), and the circulation system (9) is connected to the battery via interface two (72) installed on the sealing cover (7).

3. The high-efficiency helium detection device according to claim 1, characterized in that: The separation system (91) includes a gas membrane separator (912), the input end of which is controllably connected to the inside of the battery, the helium output end of which is connected to the nitrogen supply system (92), and the nitrogen output end of which is controllably connected to the helium supply system (93).

4. The high-efficiency helium detection device according to claim 3, characterized in that: The separation system (91) also includes a first storage tank (911) and a concentration meter (913). The first storage tank (911) and the helium supply system (93) are respectively controllably connected to the output end of the concentration meter (913). The input end and output end of the first storage tank (911) are respectively controllably connected to the concentration meter (913) and the gas membrane separator (912).

5. The high-efficiency helium detection device according to claim 3, characterized in that: The gas membrane separator (912) contains a helium separation membrane for separating helium and nitrogen and a vacuum pump.

6. The high-efficiency helium detection device according to claim 3, characterized in that: The nitrogen supply system (92) includes a second storage tank (921), the input end of which is connected to the nitrogen output end of the gas membrane separator (912), and the output end of the second storage tank (921) is controllably connected to the battery.

7. The high-efficiency helium detection device according to claim 3, characterized in that: The helium supply system (93) includes a third storage tank (932), the input end of the third storage tank (932) is controllably connected to the output end of the concentration meter (913), and the output end of the third storage tank (932) is controllably connected to the battery.

8. The high-efficiency helium detection device according to claim 1, characterized in that: The detector assembly (8) includes a helium detector and a vacuum pump, both of which are controllably connected to a sealed enclosure (6).

9. The high-efficiency helium detection device according to claim 1, characterized in that: A vacuum nozzle with a multi-layer sealing structure is installed on the sealing cap (7), and the vacuum nozzle is coupled to the battery injection hole in an end-face sealing manner.

10. The high-efficiency helium detection device according to claim 1, characterized in that: It also includes a linear drive assembly and a switching assembly. At least two outputs of the switching assembly are fixedly connected to the sealing box (6) respectively. The sealing cover (7) is installed on the output of the linear drive assembly. When the switching assembly drives the sealing box (6) to move directly below the sealing cover (7), the linear drive assembly drives the sealing cover (7) to press down.

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