Sealing device, air tightness detection apparatus, and air tightness detection method

Abstract

The application relates to a sealing device, air tightness detection equipment and an air tightness detection method, and belongs to the technical field of battery manufacturing. The sealing device is used for sealing a pressure relief valve of a battery, the pressure relief valve comprises a valve body and a valve cover, and the sealing device comprises: a sealing cover comprising a cover body and a separation part, the separation part separates an internal space of the cover body into a first chamber and a second chamber, the cover body is provided with a first open end used for being sealingly connected with the valve body; a piston, which separates the second chamber into a first sub-chamber and a second sub-chamber which are independent of each other; a piston rod, one end of the piston rod being connected to the piston; and a magnetic suction element connected to the other end of the piston rod and used for adsorbing the valve cover and opening the valve cover under the driving of the piston; wherein the sealing cover is provided with a first inlet, a second inlet and a third inlet. The sealing device is simple in structure, convenient to operate and capable of improving the air tightness detection efficiency.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and more specifically, to a sealing device, an airtightness testing device, and an airtightness testing method. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, new energy electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the automotive industry's sustainable development.

[0003] As the core component of new energy electric vehicles, the safety and reliability of the battery are of paramount importance. To ensure its safe and stable operation, the battery needs to be waterproof and dustproof, meaning it must meet sealing requirements.

[0004] During battery manufacturing, the battery's airtightness needs to be tested, typically using a gas tightness test. To perform this test, a test port connected to the battery's interior is usually installed on the battery casing. A pressurized medium is then introduced into the battery through this port for airtightness testing. In existing technologies, in addition to sealing the battery's pressure relief valve, the test port also needs to be sealed to prevent pressure leakage and maintain testing accuracy. However, the sealing device is complex in structure and cumbersome to operate, impacting the efficiency of the airtightness test. Summary of the Invention

[0005] The purpose of this application is to provide a sealing device, an airtightness testing equipment, and an airtightness testing method. This sealing device has a simple structure, is easy to operate, and can improve the efficiency of airtightness testing.

[0006] This application is achieved through the following technical solution:

[0007] In a first aspect, this application provides a sealing device for sealing a pressure relief valve of a battery. The pressure relief valve includes a valve body and a valve cover. The sealing device includes: a sealing cover, including a cover body and a partition, the partition being disposed within the cover body and dividing the internal space of the cover body into a first chamber and a second chamber. The cover body has a first open end communicating with the first chamber, the first open end being used for a sealed connection with the valve body; a piston, movably disposed within the second chamber and dividing the second chamber into a first sub-chamber and a second sub-chamber that are independent of each other; a piston rod, sealingly passing through the partition, one end of the piston rod being connected to the piston; and a magnetic suction element, disposed within the first chamber and connected to the other end of the piston rod, for adsorbing the valve cover and opening the valve cover under the action of the piston; wherein the sealing cover is provided with a first inlet for introducing a pressure medium into the first sub-chamber, a second inlet for introducing a pressure medium into the second sub-chamber, and a third inlet for introducing a pressure medium into the first chamber.

[0008] According to the sealing device of this application embodiment, the first chamber is sealed by a first open end connected to the valve body. A pressure medium is introduced into the first sub-chamber through the first inlet, making the pressure in the first sub-chamber greater than the pressure in the second sub-chamber. The piston moves towards the valve body under the action of the pressure medium in the first chamber, and a magnetic attractor located at the end of the piston rod furthest from the piston can attract the valve cover under the piston's action. A pressure medium is introduced into the second sub-chamber through the second inlet, making the pressure in the second sub-chamber greater than the pressure in the first sub-chamber. The piston moves away from the valve body under the action of the pressure medium in the second sub-chamber, and the magnetic attractor opens the valve cover under the piston's action. A pressure medium is introduced into the first chamber through the third inlet. After the valve cover is opened, the sealing device seals the pressure relief valve because the first open end is sealed to the valve body. The pressure medium entering the first chamber can enter the battery through the pressure relief valve. The pressure in the first chamber is the internal pressure of the battery. Detecting the change in pressure in the first chamber within a preset time period allows for the detection of the battery's airtightness. This sealing device can detect the airtightness of the battery by means of a pressure relief valve, without the need to open a separate hole in the battery to set up a test port. It has a simple structure, is easy to operate, and can improve the efficiency of battery airtightness detection.

[0009] According to some embodiments of this application, the piston rod is disposed in the second sub-chamber; the piston has a first position close to the first opening end and a second position away from the first opening end. When the piston is in the first position, the magnetic attractor can attract the valve cover, and when the piston is in the second position, the magnetic attractor can open the valve cover.

[0010] In the above scheme, when the piston is in the first position, the piston is close to the valve body, and the magnetic suction component can attract the valve cover. After the magnetic suction component attracts the valve cover, when the piston moves from the first position to the second position, the magnetic suction component can move away from the valve body under the action of the piston, so as to realize the operation of opening the valve cover. The operation is simple.

[0011] According to some embodiments of this application, the piston is configured to be driven by a pressure medium located in the first sub-chamber to move toward the first opening end when the pressure in the first sub-chamber is greater than the pressure in the second sub-chamber, so that the piston can move to the first position, and to be driven by a pressure medium located in the second sub-chamber to move away from the first opening end when the pressure in the second sub-chamber is greater than the pressure in the second sub-chamber, so that the piston can move to the second position.

[0012] In the above scheme, when the pressure in the first sub-chamber is greater than the pressure in the second sub-chamber, the piston moves toward the first opening end so that the piston can move to the first position, allowing the magnetic suction component to attract the valve cover; when the pressure in the second sub-chamber is greater than the pressure in the first sub-chamber, the piston moves away from the first opening end so that the piston can move to the second position, allowing the magnetic suction component to open the valve cover. This achieves the piston moving when the pressure difference between the first and second sub-chambers changes and the valve cover opening when the piston moves. The operation is convenient, highly automated, and eliminates the need for manual piston movement, thus improving the efficiency of airtightness testing.

[0013] According to some embodiments of this application, the third inlet is configured to allow the pressure medium to flow in after the valve cover is opened, so as to charge the battery with the pressure medium.

[0014] In the above scheme, when the valve cover is opened, a pressure medium is introduced into the first chamber through the third inlet. The pressure medium can enter the battery through the pressure relief valve. Since the first opening end is sealed with the valve body, the first chamber and the battery interior form a closed chamber. By detecting the pressure change of the first chamber within a preset time, the airtightness of the battery can be detected.

[0015] According to some embodiments of this application, the cover includes a body and a cover, a first opening end is disposed on the body, the body also has a second opening end, the second opening end and the first opening end are disposed opposite to each other along the axial direction of the body, the cover covers the second opening end, the partition is disposed in the body, and a second chamber is formed between the partition and the cover.

[0016] In the above scheme, the body has a second opening end opposite to the first opening end, and the cover covers the second opening end, which facilitates the assembly of the piston and the cover, and at the same time, facilitates processing and manufacturing.

[0017] According to some embodiments of this application, the first entry point is disposed on the cover, and the second and third entry points are disposed on the body.

[0018] In the above scheme, the first inlet is set on the cover, and the second and third inlets are set on the body, which facilitates the introduction of pressure medium into the corresponding chambers from different positions, avoids operational interference, and facilitates processing and manufacturing.

[0019] According to some embodiments of this application, the cover is movably connected to the body along the axial direction of the body and is sealed to the body; the sealing device further includes: at least two clamping members distributed around the body in the circumferential direction, the at least two clamping members being linked with the cover, and the at least two clamping members being configured to move closer to each other as the cover moves relative to the body in a direction away from the first opening end, so as to clamp the valve body.

[0020] In the above scheme, through the movement of the cover and the body, when the cover moves relative to the body, at least two clamping members linked with the cover can move with the cover, so that when the cover moves away from the first opening end relative to the body, the clamping members can clamp the valve body, further ensuring the sealed connection between the body and the valve body, and the operation is simple; when the pressure medium is introduced into the second sub-chamber and into the first chamber, the clamping members can always clamp the valve body, ensuring the sealed connection between the body and the valve body at all times.

[0021] According to some embodiments of this application, the clamping member is movably connected to the body along the radial direction of the body; the sealing device further includes: a transmission member, fixed to the cover and forming an inclined surface engagement with the clamping member.

[0022] In the above scheme, the movement of the cover is transmitted to the clamping member through the transmission member, so as to realize the linkage between the clamping member and the cover. The transmission member and the clamping member form an inclined surface fit, which converts the axial movement of the cover along the body into the radial movement of the clamping member along the body, thereby realizing the clamping of the valve body by the clamping member.

[0023] According to some embodiments of this application, the sealing device further includes: an elastic member for applying a radial force along the body to the clamping member so that the clamping member abuts against the transmission member.

[0024] In the above scheme, the elastic element applies a radial force along the body to the clamping element so that the clamping element abuts against the transmission element. This facilitates the movement of the transmission element, which drives the clamping element to move radially relative to the body, thus ensuring stable power transmission.

[0025] According to some embodiments of this application, the clamping member is provided with a through hole, one end of the transmission member is connected to the cover member, the other end of the transmission member passes through the through hole, and the transmission member is provided with a first inclined surface for abutting against the hole wall of the through hole.

[0026] In the above scheme, the other end of the transmission component passes through the through hole, and the first inclined surface of the transmission component abuts against the hole wall of the through hole, so as to enable the transmission component to drive the clamping component to move radially along the body when it follows the cover component.

[0027] According to some embodiments of this application, a limiting portion is provided at the end of the transmission member away from the cover, the limiting portion being used to restrict the transmission member from disengaging from the through hole.

[0028] In the above solution, the limiting part located at the end of the transmission member away from the cover abuts against the clamping member to prevent the transmission member from disengaging from the through hole, thereby ensuring a stable connection between the transmission member and the clamping member, so that the transmission member can transmit power to the clamping member when it moves with the cover member.

[0029] According to some embodiments of this application, the body has at least two guide holes corresponding to the at least two clamping members, the guide holes extending radially along the body, the clamping member including a first arm and a second arm, the first arm being inserted into the guide hole, one end of the second arm being connected to the first arm, and the other end of the second arm forming a snap-fit ​​portion for engaging with a slot of the valve body.

[0030] In the above solution, by setting a guide hole corresponding to the clamping member, the first wall of the clamping member cooperates with the guide hole to ensure stable movement of the clamping member. The snap-fit ​​part of the second arm can snap-fit ​​with the slot of the valve body when the clamping member moves radially along the body, so as to realize the clamping member clamping the valve body. The structure is simple and the operation is convenient.

[0031] According to some embodiments of this application, the snap-fit ​​portion has a second inclined surface, which is used to form an inclined engagement with the groove wall of the snap-fit ​​slot.

[0032] In the above scheme, the setting of the second inclined surface improves the smoothness and compatibility of the assembly of the clamping part and the valve body, and avoids interference between the parts; at the same time, the second inclined surface and the groove wall of the slot form an inclined surface fit, so that the clamping part is firmly engaged with the slot under the force applied by the cover part along the axial direction of the body away from the first opening end.

[0033] According to some embodiments of this application, the magnetic attractor is an electromagnet.

[0034] In the above scheme, the magnetic component is an electromagnet, which can effectively control the magnetic attraction of the component, thereby effectively controlling the attraction and disconnection of the magnetic component from the top cover, so as to control the opening or closing state of the valve cover.

[0035] According to some embodiments of this application, the sealing device further includes: a detection unit disposed in the first chamber for detecting the displacement of the valve cover.

[0036] In the above scheme, the displacement of the valve cover is detected by the detection unit, which can detect the extension height of the valve cover relative to the valve body and ensure that the valve cover opens normally.

[0037] According to some embodiments of this application, the sealing device further includes: a positioning pin, fixed to the cover, for insertion into the positioning hole of the valve body.

[0038] In the above solution, the positioning pins cooperate with the positioning holes of the valve body, which facilitates the matching and positioning of the sealing cover and the valve body, improves the assembly efficiency, and thus improves the efficiency of airtightness testing.

[0039] According to some embodiments of this application, the first opening end is provided with a first sealing element so that the first opening end is sealed to the valve body.

[0040] In the above scheme, the first opening end is sealed to the valve body through the first sealing element to ensure the airtightness of the first chamber, so that the pressure medium can be introduced into the first chamber through the third inlet. The pressure medium can enter the interior of the battery through the open valve cover to facilitate the airtightness test of the battery.

[0041] Secondly, this application provides an airtightness testing device for testing the airtightness of a battery. The airtightness testing device includes: a sealing device as described in any of the above embodiments; a first pressure providing mechanism connected to the first inlet for introducing a pressure medium into the first sub-chamber; a second pressure providing mechanism connected to the second inlet for introducing a pressure medium into the second sub-chamber; and a third pressure providing mechanism connected to the third inlet for introducing a pressure medium into the first chamber.

[0042] According to the airtightness testing device of this application embodiment, a pressure medium is introduced into the first sub-chamber through a first pressure providing mechanism to change the pressure in the first sub-chamber. When the pressure in the first sub-chamber is greater than the pressure in the second sub-chamber, the piston can move towards the first opening end. A pressure medium is introduced into the second sub-chamber through a second pressure providing mechanism to change the pressure in the second sub-chamber. When the pressure in the second sub-chamber is greater than the pressure in the first sub-chamber, the piston can move away from the first opening end. Then, after the magnetic suction member attracts the valve cover, the magnetic suction member opens the valve cover under the action of the piston. A pressure medium is introduced into the first chamber through a third pressure providing mechanism so that, at the valve cover opening, the pressure medium in the first chamber enters the battery through a pressure relief valve. The pressure medium is then introduced into the battery through the pressure relief valve, eliminating the need to open a separate testing port on the battery. The structure is simple, the operation is convenient, and the airtightness testing efficiency is improved.

[0043] Thirdly, this application provides an airtightness testing method for testing the airtightness of a battery. The airtightness testing method includes: providing a sealing device, the sealing device comprising a sealing cover, a piston, a piston rod, and a magnetic attractor; the sealing cover comprising a cover body and a partition portion; the partition portion being disposed within the cover body and dividing the internal space of the cover body into a first chamber and a second chamber; the cover body having a first opening end communicating with the first chamber; the piston being movably disposed within the second chamber and dividing the second chamber into an independent first sub-chamber and a second chamber; the piston rod sealingly passing through the partition portion; one end of the piston rod being connected to the piston; the magnetic attractor being disposed within the first chamber and connected to the other end of the piston rod; the sealing cover being provided with a first inlet for introducing a pressure medium into the first sub-chamber, a second inlet for introducing a pressure medium into the second sub-chamber, and a magnetic attractor for... A third inlet is used to introduce a pressure medium into the first chamber; the first open end is sealed to the valve body of the pressure relief valve located in the battery; a pressure medium is introduced into the first sub-chamber through the first inlet, and when the pressure in the first sub-chamber is greater than the pressure in the second sub-chamber, the piston moves toward the valve body so that the magnetic attractor can attract the valve cover of the pressure relief valve under the action of the piston; a pressure medium is introduced into the second sub-chamber through the second inlet, and when the pressure in the second sub-chamber is greater than the pressure in the second sub-chamber, the piston moves away from the valve body so that the magnetic attractor can open the valve cover under the action of the piston and keep the valve cover open; a pressure medium is introduced into the first chamber through the third inlet so that the pressure medium enters the battery through the pressure relief valve; the pressure change in the first chamber is detected within a preset time.

[0044] The airtightness testing method according to the embodiments of this application can fill the battery with a pressure medium by means of a pressure relief valve, without the need to set up a separate testing port on the battery. It has a simple structure, is easy to operate, and improves the efficiency of battery airtightness testing.

[0045] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0046] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This application provides schematic diagrams of the battery structure for some embodiments.

[0048] Figure 2 This is an exploded view of the sealing device provided in some embodiments of this application;

[0049] Figure 3 Isometric views of the sealing device and pressure relief valve in the assembly state provided in some embodiments of this application;

[0050] Figure 4 This is a front view of the sealing device and pressure relief valve in an assembled state provided in some embodiments of this application;

[0051] Figure 5 Left view of the sealing device and pressure relief valve assembly state provided in some embodiments of this application;

[0052] Figure 6 for Figure 5 A cross-sectional view along the AA direction;

[0053] Figure 7 A schematic diagram of the structure of a pressure relief valve provided in some embodiments of this application (valve cover open state);

[0054] Figure 8 Cross-sectional view of the sealing device and pressure relief valve in an unlocked state according to some embodiments of this application;

[0055] Figure 9 Cross-sectional view of the sealing device and pressure relief valve in an unlocked state provided in some other embodiments of this application;

[0056] Figure 10 A schematic diagram illustrating the separated state of the clamping member and the valve body provided in some embodiments of this application;

[0057] Figure 11 This is a schematic diagram illustrating the clamping state of the valve body provided in some embodiments of this application;

[0058] Figure 12 This is a schematic flowchart illustrating an airtightness testing method provided in some embodiments of this application.

[0059] Icons: 100-Sealing device; 10-Sealing cover; 11-Cover body; 111-First chamber; 112-Second chamber; 112a-First sub-chamber; 112b-Second sub-chamber; 113-First opening end; 1131-First seal; 114-Body; 1141-Guide hole; 1142-Fourth seal; 115-Cover; 116-Second opening end; 117-Positioning pin; 12-Separation part; 121-Third seal; 13-First inlet; 14-Second inlet; 15-Third inlet; 20-Piston; 21-Second seal; 30-Piston rod; 40-Magnetic suction element; 50-Clamping element; 51-Through hole; 52-First arm; 53-Second arm; 531-Snap-fit ​​part; 5311-Second inclined surface; 60-Transmission element; 61-First inclined surface; 62-Limiting part; 70-Elastic element; 80-Detection unit; 900-Pressure relief valve; 91-Valve body; 911-Slot; 912-Positioning hole; 92-Valve cover; 1000-Battery; 1100-Box. Detailed Implementation

[0060] 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 and completely 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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 three possibilities: A exists, A and B exist simultaneously, and B exists. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0065] In this application, "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more (including two), and "multiple pieces" refers to two or more (including two).

[0066] In this application, the term "battery" refers to a single physical module comprising one or more individual battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack.

[0067] A battery consists of a casing and individual battery cells housed within it. The casing typically includes a pressure relief valve to release internal pressure or temperature in the event of thermal runaway. A pressure relief valve is a component that actuates when the internal pressure or temperature of the battery reaches a predetermined threshold to release that pressure or temperature. When the internal pressure or temperature reaches the threshold, the pressure relief valve activates, creating an opening or channel for the release of internal pressure or temperature.

[0068] The pressure relief valve includes a valve body and a valve cover. The valve cover seals the opening of the valve body under the action of an elastic element. When the pressure or temperature inside the battery reaches a threshold, the valve cover opens under the action of the pressure inside the battery, thereby allowing the opening of the valve body to connect the inside of the battery with the outside, so as to release the internal pressure or temperature of the battery.

[0069] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, new energy electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the automotive industry's sustainable development. And for electric vehicles, battery technology is a crucial factor in their development.

[0070] During battery production, it is necessary to test the battery's airtightness to determine its waterproof and dustproof capabilities. This test involves inflating the battery and measuring the internal pressure to verify its airtightness. Simultaneously, the pressure relief valve must be effectively sealed during the airtightness test to ensure its accuracy.

[0071] The inventors discovered that, in order to perform airtightness testing on batteries, a test port connected to the battery's interior is typically installed on the battery casing to allow pressure medium to be introduced into the battery for airtightness testing. In existing technologies, in addition to sealing the battery's pressure relief valve, the test port also needs to be sealed to prevent pressure leakage and maintain testing accuracy. However, the sealing device is complex in structure and cumbersome to operate, affecting the efficiency of airtightness testing.

[0072] In view of this, in order to solve the problem of low airtightness detection efficiency caused by the complex structure and cumbersome operation of the sealing device, the inventor, after in-depth research, designed a sealing device for sealing the pressure relief valve of a battery. The sealing device includes a sealing cover, a piston, a piston rod, and a magnetic suction component. The sealing cover includes a cover body and a partition. The partition is located inside the cover body and divides the interior of the cover body into a first chamber and a second chamber. The cover body has a first open end communicating with the first chamber, which is used for sealing connection with the valve body. The piston is movably located in the second chamber and divides the second chamber into an independent first sub-chamber and a second sub-chamber. The piston rod is sealed through the partition, and one end of the piston rod is connected to the piston. The magnetic suction component is located in the first chamber and connected to the other end of the piston rod, and is used to attract the valve cover and open the valve cover under the action of the piston. The sealing cover is provided with a first inlet for introducing pressure medium into the first sub-chamber, a second inlet for introducing pressure medium into the second sub-chamber, and a third inlet for introducing pressure medium into the first chamber. This sealing device is used to seal the sealing valve, and a pressure medium is introduced into the battery through a pressure relief valve to achieve the airtightness test of the battery. It has a simple structure, is easy to operate, and improves the efficiency of airtightness testing.

[0073] This sealing device seals the first chamber by connecting it to the valve body through a first opening, making the first chamber a sealed chamber. A pressurized medium is introduced into the first sub-chamber through the first inlet, increasing the pressure in the first sub-chamber to be greater than the pressure in the second sub-chamber. The piston moves towards the valve body under the pressure of the medium in the first chamber, and a magnetic attractor at the end of the piston rod furthest from the piston attracts the valve cover. A pressurized medium is then introduced into the second sub-chamber through the second inlet, increasing the pressure in the second sub-chamber to be greater than the pressure in the first sub-chamber. The piston moves away from the valve body under the pressure of the medium in the second sub-chamber, and the magnetic attractor opens the valve cover. Finally, a pressurized medium is introduced into the first chamber through the third inlet. After the valve cover is opened, the sealing device seals the pressure relief valve because the first opening is sealed to the valve body. The pressurized medium entering the first chamber can then enter the battery through the pressure relief valve. The pressure in the first chamber is the internal pressure of the battery. Detecting the pressure change in the first chamber over a preset time allows for the detection of the battery's airtightness.

[0074] This sealing device can detect the airtightness of the battery by means of a pressure relief valve, without the need to open a separate hole in the battery to set up a test port. It has a simple structure, is easy to operate, and can improve the efficiency of battery airtightness detection.

[0075] Please see Figures 1 to 7 , Figure 1 This is a schematic diagram of the battery structure provided in some embodiments of this application. Figure 2 This is an exploded view of the sealing device provided in some embodiments of this application. Figure 3 This is an isometric view of the sealing device and pressure relief valve in their assembled state according to some embodiments of this application. Figure 4 This is a front view of the sealing device and pressure relief valve assembled in some embodiments of this application. Figure 5 This is a left view of the sealing device and pressure relief valve assembled in some embodiments of this application. Figure 6 for Figure 5 A cross-sectional view along the AA direction. Figure 7 A schematic diagram of the structure of a pressure relief valve provided in some embodiments of this application (valve cover open).

[0076] like Figure 1 As shown in the embodiments of this application, the battery 1000 includes a housing 1100 and a pressure relief valve 900 disposed on the housing 1100. The pressure relief valve 900 is a component that is actuated to release internal pressure or temperature when the internal pressure or temperature of the battery 1000 reaches a predetermined threshold. When the internal pressure or temperature of the battery 1000 reaches the threshold, the pressure relief valve 900 performs its action, thereby forming an opening or channel for releasing internal pressure or temperature.

[0077] According to some embodiments of this application, such as Figures 1 to 7 As shown, this application provides a sealing device 100 for sealing a pressure relief valve 900 of a battery 1000. The pressure relief valve 900 includes a valve body 91 and a valve cover 92. The sealing device 100 includes a sealing cover 10, a piston 20, a piston rod 30, and a magnetic suction element 40. The sealing cover 10 includes a cover body 11 and a partition 12. The partition 12 is disposed inside the cover body 11 and divides the internal space of the cover body 11 into a first chamber 111 and a second chamber 112. The cover body 11 has a first opening end 113 communicating with the first chamber 111, and the first opening end 113 is used for a sealing connection with the valve body 91. The piston 20 is movably disposed in the second chamber 112 and divides the second chamber 112 into a first sub-chamber 112a and a second sub-chamber 112b that are independent of each other. The piston rod 30 is sealed through the partition 12, and one end of the piston rod 30 is connected to the piston 20. A magnetic suction element 40 is disposed in the first chamber 111 and connected to the other end of the piston rod 30. The magnetic suction element 40 is used to attract the valve cover 92 and open the valve cover 92 under the action of the piston 20. The sealing cover 10 is provided with a first inlet 13 for introducing pressure medium into the first sub-chamber 112a, a second inlet 14 for introducing pressure medium into the second sub-chamber 112b, and a third inlet 15 for introducing pressure medium into the first chamber 111.

[0078] The sealing cover 10 is a component used to seal the valve body 91 to form a sealed chamber. The sealing cover 10 can block the pressure relief valve 900 so as to isolate the pressure relief valve 900 from the external environment.

[0079] The partition 12 divides the internal space of the cover 11 into a first chamber 111 and a second chamber 112. The piston rod 30 is sealed through the partition 12, so that the first chamber 111 and the second chamber 112 are independent of each other.

[0080] The piston 20 divides the second chamber 112 into two independent sub-chambers 112a and 112b. The piston rod 30 may be located in the second sub-chamber 112b or in the first sub-chamber 112a.

[0081] The piston 20 is movably disposed within the second chamber 112 and divides the second chamber 112 into two independent sub-chambers 112a and 112b. The piston 20 is movably sealed to the inner wall of the second chamber 112. The pressure difference between the first sub-chamber 112a and the second sub-chamber 112b can affect the position of the piston 20 within the second chamber 112. In other words, taking the piston rod 30 located in the second sub-chamber 112b as an example, when the pressure in the first sub-chamber 112a is greater than the pressure in the second sub-chamber 112b (ignoring the friction between the piston 20 and the inner wall of the second chamber 112, the same applies below), the piston 20 can move towards the first opening end 113 in the second chamber 112 under the action of the pressure in the first sub-chamber 112a, thereby increasing the volume of the first sub-chamber 112a and decreasing the volume of the second sub-chamber 112b; conversely, when the pressure in the second sub-chamber 112b is greater than the pressure in the first sub-chamber 112a (ignoring the friction between the piston 20 and the inner wall of the second chamber 112, the same applies below), the piston 20 can move away from the first opening end 113 in the second chamber 112 under the action of the pressure in the second sub-chamber 112b, thereby increasing the volume of the second sub-chamber 112b and decreasing the volume of the first sub-chamber 112a.

[0082] The magnetic attractor 40 is a magnetic component capable of attracting the component to be attracted. The magnetic attractor 40 is used to attract and open the valve cover 92 under the action of the piston 20. This means that when the piston 20 moves towards the first opening end 113, the piston rod 30 connected to the piston 20 also moves towards the first opening end 113. When the piston 20 moves to a point where the magnetic force of the magnetic attractor 40 can hold the valve cover 92, the magnetic attractor 40 can attract the valve cover 92. After the magnetic attractor 40 attracts the valve cover 92, when the piston 20 moves away from the first opening end 113, because the valve cover 92 is attracted by the magnetic attractor 40, the movement of the piston 20 can drive the magnetic attractor 40 to move away from the first opening end 113, thereby causing the magnetic attractor 40 to open the valve cover 92.

[0083] The first inlet 13 is an opening that connects the first sub-chamber 112a to the outside. A pressure medium can be introduced into the first sub-chamber 112a through the first inlet 13 to change the pressure inside the first sub-chamber 112a.

[0084] The second inlet 14 is an opening that connects the second sub-chamber 112b to the outside. A pressure medium can be introduced into the second sub-chamber 112b through the second inlet 14 to change the pressure inside the second sub-chamber 112b.

[0085] The third inlet 15 is an opening connecting the first chamber 111 and the outside. Pressure medium can be introduced into the first chamber 111 through the third inlet 15 so that pressure medium can be filled into the battery 1000 after the valve cover 92 is opened, thereby realizing the detection of the airtightness of the battery 1000.

[0086] Pressure media, also known as pressure-transmitting media, refers to the medium used to transmit pressure. Depending on the application requirements and pressure range, pressure-transmitting media can be gases, liquids, or solids. Common requirements for the medium are that it does not undergo phase change, is non-corrosive, or does not chemically react with high-pressure vessels within the operating pressure and temperature range. Gas-based pressure-transmitting media should have good fluidity, typically withstand high and low temperatures, possess electrical insulation, and achieve isostatic pressure conditions within the solidification pressure range. Optionally, the pressure medium is air.

[0087] According to the embodiment of this application, the sealing device 100 is sealed to the valve body 91 through the first open end 113, making the first chamber 111 a sealed chamber; a pressure medium is introduced into the first sub-chamber 112a through the first inlet 13, making the pressure in the first sub-chamber 112a greater than the pressure in the second sub-chamber 112b, and the piston 20 can move towards the valve body 91 under the action of the pressure medium in the first chamber 111; a magnetic suction member 40 disposed at the end of the piston rod 30 away from the piston 20 can attract the valve cover 92 under the action of the piston 20; a pressure medium is introduced into the second sub-chamber 112b through the second inlet 14, making the pressure in the second sub-chamber 112b greater than the pressure in the first sub-chamber 112a, and the piston 20 can move towards the valve body 91. Under the action of the pressure medium in the second sub-chamber 112b, it moves away from the valve body 91. The magnetic suction component 40 can open the valve cover 92 under the action of the piston 20. The pressure medium is introduced into the first chamber 111 through the third inlet 15. After the valve cover 92 is opened, the sealing device 100 seals the pressure relief valve 900 because the first opening end 113 is sealed to the valve body 91. The pressure medium entering the first chamber 111 can enter the interior of the battery 1000 through the pressure relief valve 900. The pressure in the first chamber 111 is the internal pressure of the battery 1000. The airtightness of the battery 1000 can be detected by detecting the change of the pressure in the first chamber 111 within a preset time (such as 1 hour, 1.5 hours, 2 hours, etc.). The sealing device 100 can detect the airtightness of the battery 1000 with the help of the pressure relief valve 900, without the need to open a separate hole in the battery 1000 to set up a test port. It has a simple structure, is easy to operate, and can improve the airtightness detection efficiency of the battery 1000.

[0088] Please see Figure 8 and Figure 9 As shown, Figure 8 This is a cross-sectional view of the sealing device and pressure relief valve in an unlocked state provided in some embodiments of this application. Figure 9 A cross-sectional view of the sealing device and pressure relief valve in an unlocked state, provided for some other embodiments of this application.

[0089] According to some embodiments of this application, such as Figure 6 and Figure 8 As shown, the piston rod 30 is disposed within the second sub-chamber 112b; the piston 20 has a first position near the first opening end 113 and a second position away from the first opening end 113. When the piston 20 is in the first position, as shown... Figure 8 As shown, the magnetic element 40 can attract the valve cover 92. When the piston 20 moves from the first position to the second position, as... Figure 6 As shown, the magnetic chuck 40 can open the valve cover 92.

[0090] like Figure 9 As shown, the piston rod 30 is disposed in the second sub-chamber 112b. When the piston 20 moves toward the first opening end 113, the piston rod 30 and the magnetic attractor 40 move toward the first opening end 113, and the magnetic attractor 40 moves toward the valve cover 92 so that the magnetic attractor 40 can attract the valve cover 92. When the magnetic attractor 40 attracts the valve cover 92, when the piston 20 moves from the first position to the second position, the magnetic attractor 40 can open the valve cover 92.

[0091] When piston 20 is in the first position, such as Figure 8 As shown, the magnetic chuck 40 can contact the valve cover 92, at which point the volume of the second sub-chamber 112b is at its minimum.

[0092] When piston 20 is in the first position, such as Figure 8 As shown, the piston 20 is close to the valve body 91, and the magnetic attractor 40 connected to the piston rod 30 is close to the valve cover 92, allowing the magnetic attractor 40 to attract the valve cover 92. After the magnetic attractor 40 attracts the valve cover 92, when the piston 20 moves from the first position to the second position, the magnetic attractor 40 can move away from the valve body 91 under the action of the piston 20. Figure 6 As shown, the valve cover 92 moves away from the valve body 91 under the action of the magnetic attractor 40, so as to open the valve cover 92. The operation is simple.

[0093] It should be pointed out that, Figure 9 This is a schematic diagram showing the piston 20 in the middle of the first and second positions.

[0094] According to some embodiments of this application, the piston 20 is configured to be driven by a pressure medium located in the first sub-chamber 112a to move toward the first opening end 113 when the pressure in the first sub-chamber 112a is greater than the pressure in the second sub-chamber 112b, so that the piston 20 can move to a first position, and to be driven by a pressure medium located in the second sub-chamber 112b to move away from the first opening end 113 when the pressure in the second sub-chamber 112b is greater than the pressure in the second sub-chamber 112b, so that the piston 20 can move to a second position.

[0095] When a pressure medium is introduced into the first sub-chamber 112a through the first inlet 13, the pressure inside the first sub-chamber 112a increases. When the pressure inside the first sub-chamber 112a is greater than the pressure inside the second sub-chamber 112b, the pressure medium in the first sub-chamber 112a can push the piston 20 toward the first opening end 113. Correspondingly, when a pressure medium is introduced into the second sub-chamber 112b through the second inlet 14, the pressure inside the second sub-chamber 112b increases. When the pressure inside the second sub-chamber 112b is greater than the pressure inside the first sub-chamber 112a, the pressure medium in the second sub-chamber 112b can push the piston 20 in a direction away from the first opening end 113.

[0096] When the pressure in the first sub-chamber 112a is greater than the pressure in the second sub-chamber 112b, the piston 20 moves toward the first opening end 113 so that the piston 20 can move to the first position, allowing the magnetic suction member 40 to attract the valve cover 92. When the pressure in the second sub-chamber 112b is greater than the pressure in the first sub-chamber 112a, the piston 20 moves away from the first opening end 113 so that the piston 20 can move to the second position, allowing the magnetic suction member 40 to open the valve cover 92. This allows the piston 20 to move when the pressure difference between the first sub-chamber 112a and the second sub-chamber 112b changes and the valve cover 92 to open when the piston 20 moves. This is convenient to operate, highly automated, and eliminates the need for manual operation of the piston 20, thus improving the efficiency of airtightness testing.

[0097] According to some embodiments of this application, the third inlet 15 is configured to allow pressure medium to be introduced after the valve cover 92 is opened, so as to charge the battery 1000 with pressure medium.

[0098] Pressure medium can be introduced into the first chamber 111 through the third inlet 15. If the valve cover 92 is closed, the pressure medium in the first chamber 111 will reach saturation in a short time and cannot enter the battery 1000. When the valve cover 92 is open, pressure medium is introduced into the first chamber 111 through the third inlet 15. The pressure medium can enter the battery 1000 through the pressure relief valve 900. Since the first opening end 113 is sealed with the valve body 91, the first chamber 111 and the battery 1000 form a closed chamber that is connected. By detecting the pressure change in the first chamber 111 within a preset time, the airtightness of the battery 1000 can be detected.

[0099] According to some embodiments of this application, such as Figures 2 to 6 As shown, the cover 11 includes a body 114 and a cover 115. A first opening end 113 is disposed on the body 114. The body 114 also has a second opening end 116. The second opening end 116 and the first opening end 113 are disposed opposite to each other along the axial direction of the body 114. The cover 115 covers the second opening end 116. A partition 12 is disposed inside the body 114. A second chamber 112 is formed between the partition 12 and the cover 115.

[0100] The second opening end 116 and the first opening end 113 are the ends of two openings that are arranged opposite each other along the axial direction of the body 114. The piston 20 and the piston rod 30 can be placed inside the body 114 from the second opening end 116.

[0101] The cover 115 is a component used to cover the second opening end 116. Through the sealing fit between the cover 115 and the body 114, the second chamber 112 can be guaranteed to be a sealed chamber.

[0102] The body 114 has a second opening end 116 opposite to the first opening end 113. The cover 115 covers the second opening end 116, which facilitates the assembly of the piston 20 and the cover 11, and also facilitates processing and manufacturing.

[0103] The cover 115 and the body 114 can be separate components to facilitate the assembly of the piston 20 and the body 114. Alternatively, the cover 115 and the body 114 can be integrally formed. In this case, the partition 12 and the body 114 are separate components. When assembling the piston 20 and the cover 11, the piston 20 is first placed inside the cover 11, and then the partition 12 is fitted onto the piston rod 30 and fixed inside the cover 11.

[0104] Optionally, the cover 115 and the main body 114 are separate components.

[0105] Optionally, the partition 12 is integrally formed with the body 114 to facilitate processing and manufacturing.

[0106] To ensure that the piston 20 moves flexibly and stably relative to the body 114, the piston rod 30 passes through the middle of the partition 12. That is, the middle of the partition 12 has a hole for the piston rod 30 to pass through. The hole passes through the partition 12 along the axial direction of the body 114, and the piston rod 30 passes through the hole and is sealed with the hole wall.

[0107] According to some embodiments of this application, such as Figure 3 and Figure 4 As shown, the first inlet 13 is disposed on the cover 115, and the second inlet 14 and the third inlet 15 are disposed on the body 114.

[0108] The first inlet 13 is an opening formed on the cover 115 for connecting to the second chamber 112. When the cover 115 and the piston 20 form the first sub-chamber 112a, placing the first inlet 13 on the cover 115 facilitates the introduction of pressure medium into the first sub-chamber 112a, and does not interfere with the second inlet 14, making operation convenient; at the same time, the piston 20 is less likely to interfere with the first inlet 13, ensuring that the piston 20 has a large movement path in the second chamber 112.

[0109] The second inlet 14 connects to the second sub-chamber 112b, and the third inlet 15 connects to the first chamber 111. The second inlet 14 and the third inlet 15 are disposed on the body 114. Along the axial direction of the body 114, the second inlet 14 and the third inlet 15 can be located on both sides of the partition 12 to facilitate the introduction of pressure medium into the second sub-chamber 112b and the first chamber 111 respectively, avoiding operational interference.

[0110] The first inlet 13 is located on the cover 115, and the second inlet 14 and the third inlet 15 are located on the body 114, which facilitates the introduction of pressure medium into the corresponding chambers from different positions, avoids operational interference, and facilitates processing and manufacturing.

[0111] According to some embodiments of this application, such as Figures 2 to 4 As shown, the cover 115 is movably connected to the body 114 along the axial direction of the body 114 and is in a sealing fit with the body 114; the sealing device 100 also includes at least two clamping members 50, which are distributed around the body 114 circumferentially, and the at least two clamping members 50 are linked with the cover 115, such as... Figure 6 and Figure 8 As shown, at least two clamping members 50 are configured to move closer to each other as the cover 115 moves relative to the body 114 in a direction away from the first opening end 113 to clamp the valve body 91.

[0112] The cover 115 is movably connected to and sealed with the body 114 along the axial direction of the body 114, meaning that the cover 115 can move relative to the body 114 along the axial direction of the body 114, and the cover 115 maintains a sealed fit with the body 114. When the cover 115 moves relative to the body 114, the second chamber 112 remains a closed chamber. Figure 8 As shown, the clamping member 50 does not clamp the valve body 91. When the cover member 115 moves relative to the body 114 in a direction away from the first opening end 113, as... Figure 6 As shown, the clamping member 50 moves radially along the body 114 to clamp the valve body 91.

[0113] At least two clamping members 50 are distributed around the body 114 along the circumference of the body 114. The at least two clamping members 50 can be distributed at intervals around the central axis of the body 114 to ensure that the valve body 91 is subjected to balanced force when the at least two clamping members 50 clamp the valve body 91.

[0114] Optionally, the number of clamping members 50 is two, and the two clamping members 50 are symmetrically arranged with respect to the central axis of the body 114.

[0115] The linkage between at least two clamping members 50 and the cover 115 means that at least two clamping members 50 move along with the movement of the cover 115. For example, when the cover 115 moves away from the first opening end 113 relative to the body 114, at least two clamping members 50 move closer to each other; when the cover 115 moves away from the first opening end 113 relative to the body 114, at least two clamping members 50 move away from each other.

[0116] Through the movement of the cover 115 and the body 114, when the cover 115 moves relative to the body 114, at least two clamping members 50 linked with the cover 115 can move with the cover 115, so that when the cover 115 moves relative to the body 114 away from the first opening end 113, the clamping members 50 clamp the valve body 91, further ensuring the sealed connection between the body 114 and the valve body 91, and the operation is simple; when the pressure medium is introduced into the second sub-chamber 112b and into the first chamber 111, the clamping members 50 can always clamp the valve body 91 under the drive of the cover 115, ensuring the sealed connection between the body 114 and the valve body 91.

[0117] It should be noted that when the clamping member 50 clamps the valve body 91, there is a certain pressure in the first sub-chamber 112a. When the airtightness test is performed, the cover 115 will not move toward the first opening end 113 to ensure that the clamping member 50 locks the valve body 91.

[0118] According to some embodiments of this application, such as Figure 6As shown, the clamping member 50 is movably connected to the body 114 along the radial direction of the body 114; the sealing device 100 also includes a transmission member 60, which is fixed to the cover member 115 and forms an inclined surface engagement with the clamping member 50.

[0119] The clamping member 50 is movably connected to the body 114 radially. When the cover 115 moves relative to the body 114 along the axial direction of the body 114, the clamping member 50 can move radially relative to the body 114 so as to clamp or release the valve body 91.

[0120] The transmission member 60 is a component that realizes the power transmission between the cover 115 and the clamping member 50. The power generated by the movement of the cover 115 relative to the body 114 is transmitted to the clamping member 50 through the transmission member 60, so that the clamping member 50 moves radially relative to the body 114.

[0121] The transmission component 60 and the clamping component 50 form an inclined surface fit. The transmission component 60 can convert the axial force along the body 114 into the radial force along the body 114, thereby changing the direction of the force while transmitting power.

[0122] The movement of the cover 115 is transmitted to the clamping member 50 through the transmission member 60, so as to realize the linkage between the clamping member 50 and the cover 115; the transmission member 60 and the clamping member 50 form an inclined surface engagement, which converts the axial movement of the cover 115 along the body 114 into the radial movement of the clamping member 50 along the body 114, thereby realizing the clamping of the valve body 91 by the clamping member 50.

[0123] According to some embodiments of this application, such as Figure 6 As shown, the sealing device 100 also includes an elastic element 70, which is used to apply a radial force along the body 114 to the clamping member 50 so that the clamping member 50 abuts against the transmission member 60.

[0124] The elastic element 70 is an elastic component used to apply a radial force along the body 114 to the clamping member 50. For example, the elastic element 70 can be a spring, or it can be elastic rubber, etc. The two ends of the elastic element 70 abut against the body 114 and the clamping member 50 respectively, and provide a radial force along the body 114 to the clamping member 50. The force provided by the elastic element 70 to the clamping member 50 can be a force that moves the clamping member 50 away from the body 114 radially, or it can be a force that moves the clamping member 50 closer to the body 114 radially.

[0125] The elastic element 70 applies a radial force along the body 114 to the clamping member 50 so that the clamping member 50 abuts against the transmission member 60, which facilitates the movement of the transmission member 60 and drives the clamping member 50 to move radially relative to the body 114, thus ensuring stable power transmission.

[0126] According to some embodiments of this application, such as Figure 2 and Figure 6 As shown, the clamping member 50 is provided with a through hole 51, one end of the transmission member 60 is connected to the cover member 115, and the other end of the transmission member 60 passes through the through hole 51. The transmission member 60 is provided with a first inclined surface 61 for abutting against the hole wall of the through hole 51.

[0127] The through hole 51 is a hole provided in the clamping member 50 for the transmission member 60 to pass through. The through hole 51 can penetrate the clamping member 50 along the axial direction of the body 114. The other end of the transmission member 60 passes through the through hole 51, and the hole wall of the through hole 51 can provide guidance and limit for the movement of the transmission member 60, ensuring that the transmission member 60 moves stably with the cover member 115.

[0128] The first inclined surface 61 is a sloped surface disposed on the transmission member 60 and used to abut against the wall of the through hole 51. The first inclined surface 61 is set at an angle to the axial direction of the body 114. When the first inclined surface 61 abuts against the wall of the through hole 51, the transmission member 60 and the clamping member 50 form an inclined surface engagement. When the transmission member 60 moves along the axial direction of the body 114 with the cover member 115, the transmission member 60 can drive the clamping member 50 to move radially along the body 114.

[0129] Please see Figure 10 and Figure 11 , Figure 10 This is a schematic diagram showing the separation state of the clamping member and the valve body according to some embodiments of this application. Figure 11 This is a schematic diagram illustrating the clamping state of the valve body provided in some embodiments of this application. For example... Figure 10 and Figure 11 As shown, when the cover 115 drives the transmission member 60 along the body 114 (see [reference]... Figure 6 When the axial direction of the clamping member 50 moves away from the first opening end 113, the clamping member 50 moves radially relative to the body 114 under the drive of the transmission member 60. The engagement between the transmission member 60 and the clamping member 50 is achieved by... Figure 10 Convert to Figure 11 At this time, the clamping component 50 clamps the valve body 91.

[0130] The other end of the transmission component 60 passes through the through hole 51. The first inclined surface 61 of the transmission component 60 abuts against the hole wall of the through hole 51, so that when the transmission component 60 moves with the cover 115, it can drive the clamping component 50 to move radially along the body 114. The structure is simple and easy to operate.

[0131] According to some embodiments of this application, such as Figure 2 and Figure 3 As shown, a limiting part 62 is provided at the end of the transmission member 60 away from the cover member 115. The limiting part 62 is used to restrict the transmission member 60 from disengaging from the through hole 51.

[0132] The limiting part 62 is a component provided on the transmission member 60 and used to prevent the transmission member 60 from disengaging from the through hole 51. The size of the limiting part 62 is larger than the size of the through hole 51, so as to prevent the transmission member 60 from disengaging from the through hole 51 when it moves away from the first end along with the cover member 115. The limiting part 62 only limits the transmission member 60 on one side of the axial direction of the body 114. In other words, the limiting part 62 and the cover member 115 are located on both sides of the through hole 51 along the axial direction of the body 114.

[0133] The transmission member 60 can be inserted into the through hole 51 from the side near the first opening end 113, or from the side away from the first opening end 113. In the embodiment where the transmission member 60 is inserted into the through hole 51 from the side near the first opening end 113, the transmission member 60 and the cover member 115 are separately provided and detachably connected, so that the transmission member 60 can be assembled with the cover member 115 after being inserted into the through hole 51. In this embodiment, the limiting part 62 can be integrally formed with the transmission member 60, or the limiting part 62 can be separately provided with the transmission member 60 and the two can be connected as one. In an embodiment where the transmission member 60 passes through the through hole 51 from the side away from the first opening end 113, the transmission member 60 and the cover member 115 can be integrally formed or separately provided. However, the limiting part 62 and the transmission member 60 are separately provided and detachably connected so that the transmission member 60 can pass through the through hole 51.

[0134] Optionally, the limiting part 62 may include a limiting bolt, and the end of the transmission member 60 away from the cover member 115 is provided with a threaded hole that mates with the limiting bolt, and the limiting bolt is threadedly engaged with the threaded hole.

[0135] In other embodiments, the limiting part 62 may also be a limiting pin, which passes through the transmission member 60. The limiting pin may be interference-fitted with the transmission member 60, or the limiting pin may be limited by other components to prevent the limiting pin from disengaging from the transmission member 60.

[0136] By abutting the clamping member 50 at the end of the transmission member 60 away from the cover member 115, the limiting part 62 is provided to prevent the transmission member 60 from disengaging from the through hole 51, thus ensuring a stable connection between the transmission member 60 and the clamping member 50, so that the transmission member 60 can transmit power to the clamping member 50 when it moves with the cover member 115.

[0137] According to some embodiments of this application, such as Figure 6 As shown, the body 114 has at least two guide holes 1141 corresponding to at least two clamping members 50. The guide holes 1141 extend radially along the body 114. The clamping member 50 includes a first arm portion 52 and a second arm portion 53. The first arm portion 52 is inserted into the guide hole 1141. One end of the second arm portion 53 is connected to the first arm portion 52. The other end of the second arm portion 53 forms a snap-fit ​​portion 531 for engaging with the slot 911 of the valve body 91.

[0138] The guide hole 1141 is a hole for cooperating with the clamping member 50 and for guiding the clamping member 50 to move radially relative to the body 114.

[0139] The first arm 52 is the part of the clamping member 50 that is inserted into the guide hole 1141. The first arm 52 and the body 114 slide together radially along the body 114.

[0140] The second arm 53 is the part of the clamping member 50 that is used to engage with the valve body 91. The end of the second arm 53 that is away from the first arm 52 forms a snap-fit ​​part 531. The snap-fit ​​part 531 can engage with the slot 911 of the valve body 91 to achieve clamping of the valve body 91 by the clamping member 50.

[0141] It should be noted that, in order to facilitate the assembly of the sealing device 100 and the pressure relief valve 900, the valve body 91 of the pressure relief valve 900 is provided with a slot 911. When the sealing device 100 and the pressure relief valve 900 are assembled, the snap-fit ​​part 531 of the clamping member 50 cooperates with the slot 911 of the valve body 91.

[0142] The second arm 53 can be rod-shaped, C-shaped, or irregularly shaped. Optionally, the second arm 53 is rod-shaped, and the locking portion 531 formed at the end of the second arm 53 away from the first arm 52 protrudes toward the body 114 so that the locking portion 531 can cooperate with the slot 911 of the valve body 91.

[0143] By providing a guide hole 1141 corresponding to the clamping member 50, the first wall of the clamping member 50 cooperates with the guide hole 1141 to ensure stable movement of the clamping member 50. The snap-fit ​​part 531 of the second arm 53 can snap-fit ​​with the slot 911 of the valve body 91 when the clamping member 50 moves radially along the body 114, so as to realize the clamping of the valve body 91 by the clamping member 50. The structure is simple and the operation is convenient.

[0144] According to some embodiments of this application, such as Figure 10 and Figure 11 As shown, the snap-fit ​​portion 531 has a second inclined surface 5311, which is used to form an inclined surface fit with the groove wall of the snap-fit ​​groove 911.

[0145] The second inclined surface 5311 is an inclined surface formed on the snap-fit ​​portion 531 for engaging with the groove wall of the slot 911. The second inclined surface 5311 forms an angle with the axial direction of the body 114. The second inclined surface 5311 extends toward the cover 115, and the second inclined surface 5311 engages with the groove wall of the slot 911, making the opening of the slot 911 larger so that the snap-fit ​​portion 531 can enter the slot 911.

[0146] The second inclined surface 5311 improves the smoothness and compatibility of the assembly between the clamping member 50 and the valve body 91, and avoids interference between components. At the same time, the inclined surface 5311 and the groove wall of the slot 911 form an inclined fit, so that the clamping member 50 is securely engaged with the slot 911 under the force applied by the cover member 115 along the axial direction of the body 114 away from the first opening end 113.

[0147] According to some embodiments of this application, the magnetic element 40 is an electromagnet.

[0148] An electromagnet is a device that generates electromagnetism when an electric current flows through it. A conductive winding, matched to the power of the current, is wound around an iron core. This current-carrying coil exhibits magnetism like a magnet, hence the name electromagnet. The iron core is usually made in a bar or horseshoe shape to make it easier to magnetize. Furthermore, to ensure the electromagnet demagnetizes immediately when the power is turned off, it is often made of soft iron or silicon steel, which demagnetizes quickly. Such an electromagnet is magnetic when energized, and the magnetism disappears when the power is turned off.

[0149] The magnetic attractor 40 is an electromagnet, which can effectively control the attraction of the magnetic attractor 40, thereby effectively controlling the attraction and disconnection of the magnetic attractor 40 with the top cover, so as to control the opening or closing state of the valve cover 92.

[0150] According to some embodiments of this application, such as Figure 6 As shown, the sealing device 100 also includes a detection unit 80, which is disposed in the first chamber 111 and is used to detect the displacement of the valve cover 92.

[0151] The detection unit 80 is used to detect the displacement of the valve cover 92. The detection unit 80 can be a ranging sensor, such as an ultrasonic ranging sensor, a laser ranging sensor, or an infrared ranging sensor.

[0152] The displacement of the valve cover 92 is detected by the detection unit 80, which can detect the extension height of the valve cover 92 relative to the valve body 91, ensuring that the valve cover 92 opens normally.

[0153] According to some embodiments of this application, such as Figure 2 and Figure 7As shown, the sealing device 100 also includes a positioning pin 117, which is fixed to the cover 11 and used to insert into the positioning hole 912 of the valve body 91.

[0154] The locating pin 117 is a component that serves a positioning function, used to assemble and position the cover 11 and the valve body 91. The valve body 91 is provided with a locating hole 912 corresponding to the locating pin 117.

[0155] By using the positioning pin 117 to cooperate with the positioning hole 912 of the valve body 91, it is easy to achieve the matching and positioning of the sealing cover 10 and the valve body 91, which improves the assembly efficiency and thus improves the airtightness testing efficiency.

[0156] According to some embodiments of this application, such as Figure 6 As shown, the first opening end 113 is provided with a first sealing element 1131 so that the first opening end 113 is sealed to the valve body 91.

[0157] The first sealing element 1131 is a component that performs a sealing function. The first sealing element 1131 can be a sealing ring. When the first open end 113 is connected to the valve body 91, the sealing ring is deformed by pressure to form a seal between the first open end 113 and the valve body 91.

[0158] The first sealing element 1131 achieves a sealed connection between the first opening end 113 and the valve body 91, ensuring the airtightness of the first chamber 111, so that a pressure medium can be introduced into the first chamber 111 through the third inlet 15. The pressure medium can enter the interior of the battery 1000 through the open valve cover 92, so as to facilitate the airtightness test of the battery 1000.

[0159] In some embodiments, a first sealing element 1131 is disposed on the end face of the first open end 113 facing the valve body 91. When the first open end 113 is connected to the valve body 91, the first sealing element 1131 first contacts the valve body 91, and the first open end 113 applies a force toward the valve body 91, causing the first sealing element 1131 to be deformed under pressure, thereby forming a seal between the first open end 113 and the valve body 91. In other embodiments, the first sealing element 1131 may also be disposed on the valve body 91, with the portion of the valve body 91 connected to the first open end 113 providing the first sealing element 1131, so as to form a seal between the valve body 91 and the first open end 113 when they are connected.

[0160] According to some embodiments of this application, such as Figure 6 As shown, the piston 20 is provided with a second seal 21, which is located between the piston 20 and the inner wall of the cover 11, so as to achieve a sealing fit between the piston 20 and the cover 11.

[0161] According to some embodiments of this application, such as Figure 6As shown, the partition 12 is provided with a third sealing member 121, which is located between the partition 12 and the piston rod 30 to facilitate a sealing fit between the piston rod 30 and the partition 12.

[0162] According to some embodiments of this application, such as Figure 6 As shown, a fourth sealing element 1142 is provided on the outer peripheral surface of the body 114. The fourth sealing element 1142 is located between the outer peripheral surface of the body 114 and the inner peripheral surface of the cover 115, so as to achieve a sealing fit between the body 114 and the cover 115.

[0163] According to some embodiments of this application, please refer to Figures 1 to 11 This application provides a sealing device 100 for sealing a pressure relief valve 900 of a battery 1000. The pressure relief valve 900 includes a valve body 91 and a valve cover 92. The sealing device 100 includes a sealing cover 10, a piston 20, a piston rod 30, and a magnetic suction element 40. The sealing cover 10 includes a cover body 11 and a partition 12. The partition 12 is disposed inside the cover body 11 and divides the interior of the cover body 11 into a first chamber 111 and a second chamber 112. The cover body 11 includes a main body 114 and a cover 115. The main body 114 has a first open end 113 and a second open end 116 disposed opposite to each other along its axial direction. The first open end 113 is used for a sealing connection with the valve body 91. The cover 115 covers the second open end 116, and a second chamber 112 is formed between the partition 12 and the cover 115. The cover 115 is movably connected to the main body 114 along the axial direction of the main body 114 and is in a sealing fit with the main body 114. The sealing device 100 also includes at least two clamping members 50, each clamping member 50 being connected to the cover member 115 via a transmission member 60. The clamping members 50 and the transmission member 60 form an inclined engagement, and the at least two clamping members 50 are linked with the cover member 115. When the cover member 115 moves away from the first opening end 113 along the axial direction of the body 114, the at least two clamping members 50 can move closer to each other relative to the body 114 along the radial direction of the body 114 under the drive of the corresponding transmission member 60, so as to clamp the valve body 91. When the at least two clamping members 50 clamp the valve body 91, the sealing device 100 is locked to the valve body 91. The cover member 115 is provided with a first inlet 13 to facilitate the introduction of pressure medium into the first sub-chamber 112a. The body 114 is provided with a second inlet 14 and a third inlet 15. Pressure medium can be introduced into the second sub-chamber 112b through the second inlet 14, and pressure medium can be introduced into the first chamber 111 through the third inlet 15.

[0164] According to the embodiment of this application, the sealing device 100 performs airtightness testing by means of the pressure relief valve 900 of the battery 1000. There is no need to open a separate test port for the battery 1000. The sealing device 100 and the valve body 91 of the pressure relief valve 900 are sealed together, the valve cover 92 is opened, and a pressure medium is injected into the battery 1000 through the pressure relief valve 900 to test the airtightness of the battery 1000. The structure is simple, easy to operate, and improves the efficiency of airtightness testing.

[0165] According to some embodiments of this application, this application also provides an airtightness testing device for testing the airtightness of a battery 1000. The airtightness testing device includes a sealing device 100, a first pressure providing mechanism, a second pressure providing mechanism, and a third pressure providing mechanism as provided in any of the above embodiments. The first pressure providing mechanism is connected to a first inlet 13 for introducing a pressure medium into a first sub-chamber 112a. The second pressure providing mechanism is connected to a second inlet 14 for introducing a pressure medium into a second sub-chamber 112b. The third pressure providing mechanism is connected to a third inlet 15 for introducing a pressure medium into the first chamber 111.

[0166] The first, second, and third pressure providing mechanisms can be gas sources used to provide air or inert gas (such as nitrogen, helium, etc.) pressure media.

[0167] A first pressure detection device can be installed at the first inlet 13 to detect the pressure inside the first sub-chamber 112a. A second pressure detection device can be installed at the second inlet 14 to detect the pressure inside the second sub-chamber 112b.

[0168] A differential pressure sensor can be installed at the third inlet 15. The differential pressure sensor has a first detection end and a second detection end. The first detection end is connected to the third inlet 15, and the second detection end is connected to the control chamber. The control chamber is a standard chamber used for comparison with the first chamber 111.

[0169] Since the first chamber 111 is connected to the inside of the battery 1000, and the first opening end 113 is sealed to the valve body 91, the pressure change in the first chamber 111 reflects the airtightness of the battery 1000. Therefore, the pressure change in the first chamber 111 within a preset time can be detected to achieve the airtightness detection of the battery 1000. When the first chamber 111 and the control chamber are compared using a differential pressure sensor, the pressure in the first chamber 111 is the same as the pressure in the control chamber.

[0170] According to the airtightness testing device of this application embodiment, a pressure medium is introduced into the first sub-chamber 112a through a first pressure providing mechanism to change the pressure inside the first sub-chamber 112a. When the pressure inside the first sub-chamber 112a is greater than the pressure inside the second sub-chamber 112b, the piston 20 can move toward the first opening end 113. Similarly, a pressure medium is introduced into the second sub-chamber 112b through a second pressure providing mechanism to change the pressure inside the second sub-chamber 112b. When the pressure inside the second sub-chamber 112b is greater than the pressure inside the first sub-chamber 112a... The piston 20 can move away from the first opening end 113, and then the magnetic suction member 40 will open the valve cover 92 under the action of the piston 20 after the magnetic suction member 40 attracts the valve cover 92. The pressure medium is introduced into the first chamber 111 through the third pressure supply mechanism so that the pressure medium in the first chamber 111 can enter the battery 1000 through the pressure relief valve 900 at the opening of the valve cover 92. The pressure medium is filled into the battery 1000 by means of the pressure relief valve 900. There is no need to open a separate detection port for the battery 1000. The structure is simple, the operation is convenient, and the efficiency of airtightness detection is improved.

[0171] Figure 12 A schematic flowchart of an airtightness testing method provided in some embodiments of this application is shown. According to some embodiments of this application, such as... Figure 12 As shown, this application also provides an airtightness testing method for testing the airtightness of a battery 1000, the airtightness testing method comprising:

[0172] S201, a sealing device 100 is provided. The sealing device 100 includes a sealing cover 10, a piston 20, a piston rod 30, and a magnetic attractor 40. The sealing cover 10 includes a cover body 11 and a partition 12. The partition 12 is disposed inside the cover body 11 and divides the internal space of the cover body 11 into a first chamber 111 and a second chamber 112. The cover body 11 has a first opening end 113 communicating with the first chamber 111. The piston 20 is movably disposed inside the second chamber 112 and divides the second chamber 112 into mutually independent chambers. The first sub-chamber 112a and the second sub-chamber 112b are sealed together. The piston rod 30 passes through the partition 12 in a sealed manner. One end of the piston rod 30 is connected to the piston 20. The magnetic suction member 40 is disposed in the first chamber 111 and connected to the other end of the piston rod 30. The sealing cover 10 is provided with a first inlet 13 for introducing pressure medium into the first sub-chamber 112a, a second inlet 14 for introducing pressure medium into the second sub-chamber 112b, and a third inlet 15 for introducing pressure medium into the first chamber 111.

[0173] S202, the first open end 113 is sealed and connected to the valve body 91 of the pressure relief valve 900 provided in the battery 1000;

[0174] S203, a pressure medium is introduced into the first sub-chamber 112a through the first inlet 13. When the pressure in the first sub-chamber 112a is greater than the pressure in the second sub-chamber 112b, the piston 20 moves toward the valve body 91 so that the magnetic suction member 40 can attract the valve cover 92 of the pressure relief valve 900 under the action of the piston 20.

[0175] S204, a pressure medium is introduced into the second sub-chamber 112b through the second inlet 14. When the pressure in the second sub-chamber 112b is greater than the pressure in the second sub-chamber 112b, the piston 20 moves away from the valve body 91 so that the magnetic suction member 40 can open the valve cover 92 under the action of the piston 20 and keep the valve cover 92 open.

[0176] S205, a pressure medium is introduced into the first chamber 111 through the third inlet 15 so that the pressure medium enters the battery 1000 through the pressure relief valve 900;

[0177] S206, Detect the pressure change in the first chamber 111 within a preset time.

[0178] It should be noted that the pressure medium used during the airtightness test is air. After the airtightness test is completed, excess air in the first chamber 111 is discharged, and the magnetic suction component 40 releases the valve cover 92. When the internal pressure of the battery 1000 reaches the preset value, the venting operation is stopped, and the valve cover 92 is reset under the action of the elastic component 70 (such as a spring) of the pressure relief valve 900. Alternatively, the valve cover 92 can be moved to engage with the valve body 91 by the magnetic suction component 40 and the piston rod 30, and then the valve cover 92 is released by the magnetic suction component 40.

[0179] According to the airtightness testing method of the present application embodiment, a pressure medium can be introduced into the battery 1000 by means of a pressure relief valve 900, without the need to set up a separate testing port for the battery 1000. The structure is simple, the operation is convenient, and the efficiency of airtightness testing of the battery 1000 is improved.

[0180] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. 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 sealing device for sealing a battery pressure relief valve, the pressure relief valve comprising a valve body and a valve cover, characterized in that, The sealing device includes: A sealing cover includes a cover body and a partition, the partition being disposed within the cover body and dividing the internal space of the cover body into a first chamber and a second chamber, the cover body having a first opening end communicating with the first chamber, the first opening end being used for a sealing connection with the valve body; A piston is movably disposed within the second chamber and divides the second chamber into a first sub-chamber and a second sub-chamber that are independent of each other; A piston rod, sealingly passing through the partition, one end of the piston rod being connected to the piston; and A magnetic suction element is disposed in the first chamber and connected to the other end of the piston rod, for attracting the valve cover and opening the valve cover under the action of the piston; The sealing cover is provided with a first inlet for introducing a pressure medium into the first sub-chamber, a second inlet for introducing a pressure medium into the second sub-chamber, and a third inlet for introducing a pressure medium into the first chamber. The piston is movably and sealingly fitted with the inner wall of the second chamber; The piston rod is disposed in the second sub-chamber; The piston has a first position close to the first opening end and a second position away from the first opening end. When the piston is in the first position, the magnetic attractor can attract the valve cover. When the piston moves from the first position to the second position, the magnetic attractor can open the valve cover. The piston is configured to be driven by a pressure medium located in the first sub-chamber to move toward the first opening end when the pressure in the first sub-chamber is greater than the pressure in the second sub-chamber, so that the piston can move to the first position, and to be driven by a pressure medium located in the second sub-chamber to move away from the first opening end when the pressure in the second sub-chamber is greater than the pressure in the first sub-chamber, so that the piston can move to the second position.

2. The sealing device according to claim 1, characterized in that, The third inlet is configured to allow the pressure medium to flow in after the valve cover is opened, so as to charge the battery with the pressure medium.

3. The sealing device according to claim 1, characterized in that, The cover includes a body and a cover. The first opening end is disposed on the body. The body also has a second opening end. The second opening end and the first opening end are disposed opposite to each other along the axial direction of the body. The cover covers the second opening end. The partition is disposed in the body. The partition and the cover form a second chamber.

4. The sealing device according to claim 3, characterized in that, The first inlet is located on the cover, and the second and third inlets are located on the body.

5. The sealing device according to claim 3, characterized in that, The cover is movably connected to the body along the axial direction of the body and is sealed to the body; The sealing device also includes: At least two clamping members are distributed around the body in a circumferential direction. The at least two clamping members are linked to the cover and are configured to move closer to each other as the cover moves relative to the body away from the first opening end to clamp the valve body.

6. The sealing device according to claim 5, characterized in that, The clamping member is movably connected to the body along the radial direction of the body; The sealing device also includes: The transmission component is fixed to the cover and forms an inclined surface engagement with the clamping component.

7. The sealing device according to claim 6, characterized in that, The sealing device also includes: An elastic element is used to apply a radial force along the body to the clamping member so that the clamping member abuts against the transmission member.

8. The sealing device according to claim 6, characterized in that, The clamping member is provided with a through hole, one end of the transmission member is connected to the cover member, the other end of the transmission member passes through the through hole, and the transmission member is provided with a first inclined surface for abutting against the hole wall of the through hole.

9. The sealing device according to claim 8, characterized in that, A limiting portion is provided at the end of the transmission member away from the cover, and the limiting portion is used to prevent the transmission member from disengaging from the through hole.

10. The sealing device according to claim 6, characterized in that, The body has at least two guide holes corresponding to the at least two clamping members. The guide holes extend radially along the body. The clamping member includes a first arm and a second arm. The first arm is inserted into the guide hole. One end of the second arm is connected to the first arm. The other end of the second arm forms a snap-fit ​​portion for engaging with a slot of the valve body.

11. The sealing device according to claim 10, characterized in that, The snap-fit ​​portion has a second inclined surface, which is used to form an inclined engagement with the groove wall of the snap-fit ​​slot.

12. The sealing device according to any one of claims 1-11, characterized in that, The magnetic attractor is an electromagnet.

13. The sealing device according to any one of claims 1-11, characterized in that, The sealing device also includes: A detection unit, located in the first chamber, is used to detect the displacement of the valve cover.

14. The sealing device according to any one of claims 1-11, characterized in that, The sealing device also includes: A positioning pin, fixed to the cover, is used to insert into the positioning hole of the valve body.

15. The sealing device according to any one of claims 1-11, characterized in that, The first opening end is provided with a first sealing element so that the first opening end is sealed to the valve body.

16. An airtightness testing device for testing the airtightness of a battery, characterized in that, The airtightness testing equipment includes: The sealing device as described in any one of claims 1-15; A first pressure supply mechanism, connected to the first inlet, is used to introduce a pressure medium into the first sub-chamber; The second pressure supply mechanism, connected to the second inlet, is used to supply pressure medium to the second sub-chamber; A third pressure supply mechanism, connected to the third inlet, is used to introduce a pressure medium into the first chamber.

17. A method for detecting the airtightness of a battery using the sealing device according to any one of claims 1-15, characterized in that, The airtightness testing method includes: A sealing device is provided, the sealing device comprising a sealing cover, a piston, a piston rod, and a magnetic suction element; The first open end is sealed to the valve body of the pressure relief valve provided in the battery; A pressure medium is introduced into the first sub-chamber through the first inlet. When the pressure in the first sub-chamber is greater than the pressure in the second sub-chamber, the piston moves toward the valve body so that the magnetic suction component can attract the valve cover of the pressure relief valve under the action of the piston. A pressure medium is introduced into the second sub-chamber through the second inlet. When the pressure in the second sub-chamber is greater than the pressure in the first sub-chamber, the piston moves away from the valve body so that the magnetic suction component can open the valve cover under the action of the piston and keep the valve cover open. A pressure medium is introduced into the first chamber through the third inlet, so that the pressure medium enters the battery through the pressure relief valve. The pressure change in the first chamber is detected within a preset time period.

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