A valve structure

Abstract

The application discloses a valve structure. The valve structure is used in the formation process of a battery, a cover plate of the battery is provided with a liquid injection hole, and the valve structure comprises a valve body, a valve core and a reset member. The valve body has a cavity. A first through hole in communication with the cavity is arranged on a first surface of the valve body. A plug-in part for sealingly plugging into the liquid injection hole is arranged on a second surface of the valve body. A second through hole for communicating the cavity with an internal space of the battery is arranged in the plug-in part. The valve core is in sliding fit with the first through hole. A gas extraction hole in the valve core penetrates the valve core and is towards a surface of the valve core on the outside of the valve body and a peripheral wall of the valve core. When the valve core is in a sealing position, a hole wall of the first through hole blocks the gas extraction hole. When the valve core is in a conducting position, the gas extraction hole is in communication with the cavity. The reset member is used for providing a reset force for the valve core to slide from the conducting position to the sealing position. The valve structure can keep the battery in a sealed state during the whole process of pressing the negative pressure suction nozzle to the valve structure from injecting electrolyte to formation.

Description

Technical Field

[0001] This utility model relates to the field of battery processing equipment technology, and in particular to a valve structure. Background Technology

[0002] The production process of lithium batteries includes steps such as cell fabrication, casing, electrolyte injection, formation, capacity testing, and inspection. Formation is the first charge-discharge process after electrolyte injection. Formation activates the positive and negative electrode materials inside the battery and forms a solid electrolyte interface film on the surface of the negative electrode. After electrolyte injection, the injection hole is temporarily sealed with adhesive pins. When formation is required, the adhesive pins are removed, exposing the injection hole for connection to a negative pressure suction nozzle. This nozzle uses negative pressure to pump out the gas generated during electrolyte decomposition during formation, preventing battery bulging or internal short circuits.

[0003] However, in actual operation, there is a certain time interval between pulling out the glue pin and pressing the negative pressure nozzle onto the injection hole. This results in the injection hole being unsealed during this period, which can easily lead to the evaporation of electrolyte inside the battery and contaminants falling into the battery through the injection hole. Utility Model Content

[0004] This application discloses a valve structure that, during the battery manufacturing process, from the injection of electrolyte to the formation process where the negative pressure nozzle is pressed into the valve structure, ensures that the battery remains in a sealed state, which is beneficial for improving battery performance.

[0005] To achieve the above objectives, this application discloses a valve structure, including: A valve body having a chamber, a first through hole communicating with the chamber is provided on a first surface of the valve body, and a plug-in portion is provided on a second surface of the valve body for sealing the liquid injection hole of the battery, and a second through hole is provided inside the plug-in portion for communicating with the internal space of the chamber and the battery. The valve core has an outer peripheral wall that slides with the first through hole. The valve core has an air extraction hole that penetrates the outer side of the valve core facing the valve body and the outer peripheral wall of the valve core. The valve core has a sealing position and a conducting position. When the valve core is in the sealing position, the hole wall of the first through hole blocks the air extraction hole. When the valve core is in the conducting position, the air extraction hole communicates with the chamber. A reset element is connected between the valve body and the valve core, and is used to provide a reset force for the valve core to slide from the open position to the sealed position.

[0006] In one possible implementation, the first end of the air extraction port penetrates the side of the valve core facing the outside of the valve body, and the second end of the air extraction port penetrates the outer peripheral wall of the valve core. When the valve core is in the sealed position, the hole wall of the first through hole blocks the second end. When the valve core is in the open position, the second end of the air extraction port communicates with the chamber. The valve core has a first end face facing the cavity. The valve structure also includes a first sealing element. The first sealing element is circumferentially disposed on the outer peripheral wall of the valve core and is located between the second end of the air extraction hole and the first end face along the axial direction of the first through hole. When the valve core is in the sealed position, the first sealing element is in sealing contact with the hole wall of the first through hole. When the valve core is in the open position, the first sealing element is separated from the hole wall of the first through hole.

[0007] In one possible implementation, the air extraction port includes a first segment and a second segment that are interconnected. The first segment extends axially along the first through hole. The end of the first segment away from the second segment penetrates the outer side of the valve core facing the valve body. The first end of the second segment is connected to the first segment. The second end of the second segment penetrates the outer peripheral wall of the valve core. The second end of the second segment is positioned closer to the first end face than the first end of the second segment.

[0008] In one possible implementation, there are multiple second holes, which are spaced apart around the outer peripheral wall of the valve core.

[0009] In one possible implementation, the first through hole includes a third segment and a fourth segment that are interconnected. The end of the third segment away from the fourth segment penetrates the first surface. The third segment slides in fit with the outer peripheral wall of the valve core. The inner diameter of the fourth segment is larger than the inner diameter of the third segment. When the valve core is in the sealed position, the first sealing element is in sealing contact with the wall of the fourth segment. When the valve core is in the open position, the first sealing element is separated from the wall of the fourth segment.

[0010] In one possible implementation, the valve core includes: The main body has a first end face and a second end face that are axially opposite each other along the first through hole. The second end face is disposed facing the cavity and the second end face is disposed facing the outside of the valve body. The outer peripheral wall of the main body is slidably engaged with the first through hole. A stop portion is provided on the second end face, and the diameter of the largest circumscribed circle of the stop portion is larger than the diameter of the first through hole. The first end of the air extraction hole penetrates the side of the stop portion away from the main body.

[0011] In one possible implementation, when the valve core is in the sealed position, there is a gap between the stop portion and the first surface; when the valve core is in the open position, the stop portion abuts against the first surface.

[0012] In one possible implementation, a second seal is provided on the side of the stop portion facing the first surface, the second seal being used to seal against the first surface when the valve core is in the open position.

[0013] In one possible implementation, the reset element includes any one of a spring, a rubber post, or a foam post.

[0014] In one possible implementation, the valve body includes a detachably connected upper valve body and a lower valve body, the upper valve body and the lower valve body surrounding the chamber, and a third sealing element is provided between the upper valve body and the lower valve body.

[0015] Compared with the prior art, this application has at least the following beneficial effects: In this application, the plug-in portion of the valve structure is used to seal the electrolyte injection hole of the battery. When the valve core is in the sealed position, the battery can be sealed until the negative pressure cup in the negative pressure suction device is pressed against the side of the valve core facing the valve body during the formation process, and the negative pressure suction nozzle of the negative pressure cup is pressed against the suction hole. At this time, the valve core can be in the conducting position, so that the internal space of the battery is connected to the cup cavity of the negative pressure cup. This allows the gas generated in the internal space of the battery during the formation process to be discharged from the internal space of the battery to the negative pressure cup. That is to say, from the time the battery is filled with electrolyte until the cup cavity of the negative pressure cup is connected to the internal space of the battery during the formation process, the battery can always be kept in a sealed state, avoiding the exposure of the electrolyte injection hole. This effectively prevents the electrolyte inside the battery from evaporating or external contaminants from falling into the internal space of the battery, which is beneficial to improving battery performance. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of a valve structure provided in an embodiment of this application when the valve core is in the sealed position; Figure 2 This is a cross-sectional view of a valve structure with the valve core in the sealed position, provided in an embodiment of this application. Figure 3 This is a schematic diagram of a valve structure provided in an embodiment of this application when the valve core is in the conducting position; Figure 4 This is a cross-sectional view of a valve structure with the valve core in the conducting position, provided in an embodiment of this application. Figure 5 This is a schematic diagram of the structure provided in this application when a valve structure is inserted into the battery's filling hole and when a negative pressure cup is pressed onto the valve structure; Figure 6 This is the book Figure 5 AA section view in the middle; Figure 7 yes Figure 6 Enlarged view of position B in the image; Figure 8 This is a cross-sectional view of a valve core provided in an embodiment of this application; Figure 9 This is a cross-sectional view of a valve body provided in an embodiment of this application.

[0018] Explanation of reference numerals in the attached figures: 1-Valve body; 11-Upper valve body; 111-First surface; 12-Lower valve body; 121-Second surface; 13-First through hole; 131-Third hole section; 132-Fourth hole section; 14-Plug-in part; 15-Second through hole; 16-Cavity; 2-Valve core; 21-Main body; 211-First end face; 22-Stop; 23-Air extraction port; 231-First hole section; 232-Second hole section; 3-Reset component; 4-First seal; 5-Second seal; 6-Third seal; 10-Valve structure; 20 - Battery; 210 - Filling port; 30-Negative pressure cup. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0021] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0022] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0023] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, components, or parts (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, components, or parts. Unless otherwise stated, "a plurality of" means two or more.

[0024] Based on the problems described in the background art, this application discloses a valve structure. During the battery manufacturing process, from the injection of electrolyte to the formation process where the negative pressure nozzle is pressed into the valve structure, the battery can always be kept in a sealed state, effectively avoiding the situation where electrolyte evaporates or contaminants fall into the battery due to the exposure of the injection hole, which is beneficial to improving battery performance.

[0025] The technical solution of this application will be described in detail below with reference to specific embodiments and accompanying drawings.

[0026] This application provides a valve structure, such as... Figures 1-7As shown, the valve structure 10 includes a valve body 1, a valve core 2, and a reset member 3. The valve body 1 has a chamber 16. A first through hole 13 communicating with the chamber 16 is provided on the first surface 111 of the valve body 1. A plug-in portion 14 is provided on the second surface 121 of the valve body 1. The plug-in portion 14 is used to seal the liquid injection hole 210 of the battery 20. A second through hole 15 is provided inside the plug-in portion 14. One end of the second through hole 15 communicates with the chamber 16, and the other end communicates with the internal space of the battery 20. The outer peripheral wall of the valve core 2 slides against the first through hole 13. In conjunction with the valve core 2, there is an air extraction hole 23, which penetrates the outer side of the valve core 2 facing the valve body 1 and the outer peripheral wall of the valve core 2. The valve core 2 has a sealed position and a conducting position. When the valve core 2 is in the sealed position, the hole wall of the first through hole 13 blocks the air extraction hole 23. When the valve core 2 is in the conducting position, the air extraction hole 23 communicates with the chamber 16. The reset member 3 is connected between the valve body 1 and the valve core 2 and is used to provide the valve core 2 with a reset force to slide from the conducting position to the sealed position.

[0027] Understandably, the valve structure can be used in the battery formation process, wherein the battery 20 includes a cover plate with an injection hole 210.

[0028] In this embodiment, the valve body 1 has a chamber 16 and a first through hole 13 communicating with the chamber 16. The outer peripheral wall of the valve core 2 is slidably engaged with the first through hole 13. The valve core 2 has an air extraction hole 23, which penetrates the side of the valve core 2 facing the outside of the valve body 1 and the outer peripheral wall of the valve core 2. When the valve core 2 is in the sealed position, the hole wall of the first through hole 13 blocks the air extraction hole 23. When the valve core 2 is in the open position, the air extraction hole 23 communicates with the chamber 16. When the valve core 2 is in the sealed position, the chamber 16 can be sealed. When the valve core 2 is in the open position, the air extraction hole 23 communicates with the chamber 16. A connector 14 is provided on the second surface 121 of the valve body 1. The connector 14 is used to seal and connect to the injection hole 210. A second through hole 15 is provided inside the connector 14. One end of the second through hole 15 communicates with the chamber 16, and the other end communicates with the internal space of the battery 20. When the connector 14 of the valve structure 10 is sealed and connected to the injection hole 210, when the valve core 2 is in the sealed position, because the chamber 16 is sealed, the internal space of the battery 20 can only communicate with the chamber 16 through the second through hole 15, and cannot communicate with the outside. This achieves control of the battery 20. The valve core 2 is in the open position. For example, in the formation process, when the negative pressure cup 30 in the negative pressure equipment is pressed against the side of the valve core 2 facing the outside of the valve body 1, and the negative pressure suction nozzle on the negative pressure cup 30 is pressed against the suction port 23, the suction port 23 is connected to the chamber 16, which allows the internal space of the battery 20 to be connected to the cup cavity of the negative pressure cup 30, so that the gas in the internal space of the battery 20 can flow into the cup cavity of the negative pressure cup 30. For example, when the battery 20 is formed, the gas generated in the internal space of the battery 20 can flow to the negative pressure cup 30 through the valve structure 10.

[0029] In other words, after injecting electrolyte into the battery 20, the insertion part 14 of the valve structure 10 can be sealed and inserted into the injection hole 210. When the valve core 2 is in the sealed position, the battery 20 can be sealed until, during the formation process, the negative pressure cup 30 in the negative pressure suction device is pressed against the side of the valve core 2 facing the outside of the valve body 1, and the negative pressure suction nozzle on the negative pressure cup 30 is pressed against the suction hole 23. At this time, the valve core 2 can be in the conducting position, so that the internal space of the battery 20 is connected to the cup cavity of the negative pressure cup 30, thereby allowing... The gas generated in the internal space of the battery 20 during the formation process is discharged from the internal space of the battery 20 to the negative pressure cup 30. Thus, from the time the battery 20 is injected with electrolyte until the cup cavity of the negative pressure cup 30 is connected to the internal space of the battery 20 during the formation process, the battery 20 can always be kept in a sealed state, avoiding the exposure of the electrolyte injection hole 210. This effectively prevents the electrolyte inside the battery 20 from evaporating or external contaminants from falling into the internal space of the battery 20, which is beneficial to improving the performance of the battery 20.

[0030] Furthermore, a reset element 3 is connected between the valve body 1 and the valve core 2 to provide a reset force for the valve core 2 to slide from the open position to the sealed position. Thus, after the negative pressure cup 30 in the negative pressure suction device is removed from the valve core 2, the valve core 2 can slide from the open position to the sealed position under the action of the reset element 3, thereby resealing the chamber 16 and resealing the battery 20. Moreover, when no pressure is applied to the valve core 2, the reset element 3 ensures that the valve core 2 remains in the sealed position, so that the battery 20 remains sealed when communication between its internal space and the external space is not required. This effectively prevents the electrolyte inside the battery 20 from evaporating or contaminants from falling into its internal space, thus improving the performance of the battery 20.

[0031] The insertion part 14 can be an elastic insertion part. For example, the material of the insertion part 14 can be fluororubber, butyl rubber, polyethylene, etc., and the outer diameter of the insertion part 14 can be slightly larger than the diameter of the injection hole 210 so that the insertion part 14 can deform when inserted into the injection hole 210, making it easy to insert. The outer wall of the insertion part 14 can be well sealed and abutted against the wall of the injection hole 210, thereby improving the sealing performance of the injection hole 210.

[0032] The first surface 111 and the second surface 121 can be along the first direction on the valve body 1 (e.g., ...). Figure 2 The first direction is opposite to the direction shown in the middle (x). At this time, the first direction can be parallel to the axis of the first through hole 13.

[0033] The aforementioned suction port 23 penetrates the outer side of the valve core 2 facing the valve body 1 and the outer peripheral wall of the valve core 2. Specifically, the first end of the suction port 23 penetrates the outer side of the valve core 2 facing the valve body 1, and the second end of the suction port 23 penetrates the outer peripheral wall of the valve core 2. When the valve core 2 is in the sealed position, the wall of the first through hole 13 blocks the second end; when the valve core 2 is in the open position, the second end of the suction port 23 communicates with the chamber 16. Specifically, when the valve core 2 is in the sealed position, the wall of the first through hole 13 blocks the second end. This can be achieved by the second end of the suction port 23 being located within the first through hole 13, and the outer peripheral wall of the valve core 2 surrounding the second end sealingly abutting against the wall of the first through hole 13, thereby blocking the second end of the suction port 23.

[0034] Furthermore, the first through hole 13 can extend along the first direction, and the outer peripheral wall of the valve core 2 can slide and engage with the first through hole 13 along the first direction, which makes the structure of the first through hole 13 relatively simple and easy to implement. Of course, the extension direction of the first through hole 13 can also have an angle with the first direction, such as 15°, 20°, 30°, etc., and is not limited here.

[0035] Optionally, such as Figure 2 and Figure 4 As shown, the valve core 2 has a first end face 211 facing the cavity 16. The valve structure 10 also includes a first sealing element 4. The first sealing element 4 is arranged around the outer peripheral wall of the valve core 2 and is located between the second end of the air extraction hole 23 and the first end face 211 along the first direction. When the valve core 2 is in the sealed position, the first sealing element 4 is sealed and abuts against the hole wall of the first through hole 13. When the valve core 2 is in the open position, the first sealing element 4 is separated from the hole wall of the first through hole 13.

[0036] Therefore, when the valve core 2 is in the sealed position, the gap between the outer peripheral wall of the valve core 2 and the hole wall of the first through hole 13 can also be sealed by the first sealing element 4, preventing the electrolyte from evaporating from the gap between the valve core 2 and the hole wall of the first through hole 13. At the same time, when the hole wall of the first through hole 13 does not seal the second end of the vent hole 23 tightly, it can also prevent the vent hole 23 from communicating with the chamber 16, making the valve structure 10 better sealed to the battery 20.

[0037] The valve core 2 has an installation groove on its outer peripheral wall near the first end face 211. Part of the first sealing member 4 can be embedded in the installation groove, and another part can protrude from the outer peripheral wall of the valve core 2. When the valve core 2 is in the sealing position, the first sealing member 4 can seal against the wall of the first through hole 13, so that the first sealing member 4 can provide a good seal for the chamber 16, and the connection between the first sealing member 4 and the valve core 2 can be more secure.

[0038] In addition, the first sealing element 4 may include a sealing ring, such as an O-ring, a Y-ring, a V-ring, etc., without limitation, so that the joint of the first sealing element 4 can be relatively simple and easy to implement.

[0039] Of course, in other embodiments, the first seal 4 may also include a sealant. The sealant, in a liquid state, is applied around the outer periphery of the valve core 2, and after curing, forms a ring-shaped sealant on the outer periphery of the valve core 2. This allows for better temperature resistance in the connection between the first seal 4 and the valve core 2. The sealant can be any of polyurethane sealant, silicone sealant, polysulfide sealant, etc., and is not limited thereto.

[0040] Optionally, such as Figure 7 and Figure 8As shown, the air extraction port 23 includes a first hole section 231 and a second hole section 232 that are interconnected. The first hole section 231 extends axially along the first through hole 13. The end of the first hole section 231 away from the second hole section 232 passes through the outer side of the valve core 2 facing the valve body 1. The first end of the second hole section 232 is connected to the first hole section 231. The second end of the second hole section 232 passes through the outer peripheral wall of the valve core 2. The second end of the second hole section 232 is positioned close to the first end face 211 relative to the first end of the second hole section 232.

[0041] Therefore, the vent 23 can include a first hole segment 231 extending axially along the first through hole 13 and a second hole segment 232 inclined relative to the first hole segment 231, so that the structure of the vent 23 can be relatively simple and easy to implement, reducing costs. At the same time, when the valve core 2 is in the conducting position, the gas generated in the internal space of the battery 20 can be discharged more smoothly through the vent 23.

[0042] The diameter of the second hole section 232 may be the same as or different from the diameter of the first hole section 231; this is not limited here.

[0043] In addition, there can be multiple second holes 232, with multiple second holes 232 arranged at intervals around the outer peripheral wall of the valve core 2.

[0044] Therefore, during the formation of the battery 20, the gas generated in the internal space of the battery 20 can flow through multiple second orifice sections 232 to the first orifice section 231, and then flow into the cup cavity of the negative pressure cup 30, so that the gas in the internal space of the battery 20 can be discharged more quickly, effectively reducing the probability of the battery 20 expanding due to the generation of gas during the formation process.

[0045] The number of second hole segments 232 can be two, three or more, and is not limited here.

[0046] In addition, multiple second holes 232 can be evenly arranged around the outer peripheral wall of the valve core 2. For example, there can be two second holes 232, which are symmetrically arranged on the valve core 2 about the center line of the first hole 231. In this way, gas in the internal space of the battery 20 can be discharged to the first hole 231 in a timely manner, while the structural strength of the valve core 2 at the location of the second holes 232 is not easily affected.

[0047] Optionally, such as Figure 2 , Figure 7 and Figure 9As shown, the first through hole 13 includes a third hole section 131 and a fourth hole section 132 that are interconnected. The end of the third hole section 131 away from the fourth hole section 132 passes through the first surface 111. The third hole section 131 is in sliding fit with the outer peripheral wall of the valve core 2. The inner diameter of the fourth hole section 132 is larger than the inner diameter of the third hole section 131. When the valve core 2 is in the sealed position, the first sealing member 4 is in sealing contact with the hole wall of the fourth hole section 132. When the valve core 2 is in the open position, the first sealing member 4 is separated from the hole wall of the fourth hole section 132.

[0048] Therefore, when the valve core 2 slides in the first through hole 13, it can effectively reduce the frictional resistance between the first seal 4 and the hole wall of the first through hole 13, so that the valve core 2 can slide in the first through hole 13 with less effort and more smoothly.

[0049] The inner diameter of the fourth hole segment 132 can gradually increase along the direction from the first surface 111 to the second surface 121, that is, the fourth hole segment 132 can be a conical hole, or the inner diameters of each part of the fourth hole segment 132 can be approximately the same, that is, the fourth hole can be a cylindrical hole, as long as the inner diameter of the fourth hole segment 132 is greater than the inner diameter of the third hole segment 131. At this time, a stepped surface can be formed on the periphery of the end of the third hole segment 131 facing the fourth hole segment 132. When the valve core 2 is in the sealing position, the first sealing element 4 can also seal against the stepped surface. Of course, the inner diameter of the fourth hole segment 132 can also be implemented in other ways, which are not limited here.

[0050] In addition, when the fourth hole segment 132 is a tapered hole and the valve core 2 is in the conducting position, the first sealing member 4 can be partially located in the chamber 16. At this time, the second end of the vent hole 23 can be at least partially located in the fourth hole segment 132. Alternatively, the first sealing member 4 can be completely located in the chamber 16. At this time, the second end of the vent hole 23 can be partially located in the fourth hole segment 132 or completely located in the fourth hole segment 132. As long as the vent hole 23 can communicate with the chamber 16 when the valve core 2 is in the conducting position, no limitation is made here.

[0051] The valve core 2 described above can be implemented in various ways. In one possible implementation, the valve core 2 can be a columnar structure. The columnar valve core 2 slides with the first through hole 13. Thus, the structure of the valve core 2 can be relatively simple and easy to implement.

[0052] In another possible implementation of valve core 2, such as Figures 7-9As shown, the valve core 2 may include a main body 21 and a stop portion 22. The main body 21 has a first end face 211 and a second end face that are axially opposite each other along the first through hole 13. The second end face is disposed facing the inside of the chamber 16 and facing the outside of the valve body 1. The outer peripheral wall of the main body 21 is slidably fitted with the first through hole 13. The stop portion 22 is disposed on the second end face, and the diameter of the largest circumscribed circle of the stop portion 22 is larger than the diameter of the first through hole 13. The first end of the air extraction hole 23 passes through the side of the stop portion 22 that is away from the main body 21.

[0053] Therefore, when pressure is applied to the valve core 2, that is, when the negative pressure cup 30 is pressed onto the valve core 2, the stop part 22 can prevent the valve core 2 from being accidentally embedded into the first through hole 13. This avoids the gap between the negative pressure suction nozzle on the negative pressure cup 30 and the valve core 2 caused by the valve core 2 being embedded into the first through hole 13. This prevents the leakage of gas discharged from the internal space of the battery 20 due to the gap between the negative pressure suction nozzle on the negative pressure cup 30 and the valve core 2, thus improving the safety of the battery 20 manufacturing process.

[0054] In addition, the diameter of the largest outer circle of the stop part 22 is larger than the diameter of the first through hole 13, which also allows the area of ​​the side of the stop part 22 facing away from the main body part 21 to be larger, which is beneficial for the pressing of the negative pressure nozzle on the negative pressure cup 30 and facilitates operation.

[0055] The cross-sectional shape of the stop portion 22 can be any of the following: circular, rectangular, elliptical, etc., and is not limited here.

[0056] The cross-sectional shape of the main body 21 can be any of the following: circular, rectangular, elliptical, etc., as long as it can slide and fit with the first through hole 13. There is no limitation here.

[0057] In addition, a limiting protrusion is provided around the air extraction hole 23 on the side of the stop part 22 facing away from the main body part 21. When the negative pressure cup 30 in the negative pressure structure is pressed onto the stop part 22, the limiting protrusion can position the negative pressure nozzle of the negative pressure cup 30, so that the negative pressure nozzle of the negative pressure cup 30 can be quickly pressed onto the air extraction hole 23, thereby improving efficiency.

[0058] Optionally, when the valve core 2 is in the sealed position, there is a gap between the stop portion 22 and the first surface 111; when the valve core 2 is in the open position, the stop portion 22 abuts against the first surface 111.

[0059] Therefore, the valve core 2 can be positioned by the stop part 22. When the negative pressure on the negative pressure cup 30 is sucked and pressed against the stop part 22, the valve core 2 can be slid to the position of sliding until the stop part 22 abuts against the first surface 111, which facilitates the operation.

[0060] In addition, such as Figure 2 and Figure 4 As shown, a second sealing member 5 is provided on the side of the stop portion 22 facing the first surface 111. The second sealing member 5 is used to seal against the first surface 111 when the valve core 2 is in the open position.

[0061] Therefore, when the valve core 2 is in the conducting position, the gap between the stop part 22 and the first surface 111 can be sealed by the second sealing member 5 to prevent the gas in the internal space of the battery 20 from flowing out through the gap between the stop part 22 and the first surface 111. This makes it less likely for the gas in the internal space of the battery 20 to leak when it flows through the valve structure 10, thus avoiding gas leakage due to poor sealing between the valve core 2 and the valve body 1 during the formation of the battery 20, which helps to improve the safety of the battery 20 manufacturing process.

[0062] The implementation of the second sealing element 5 can be roughly the same as that of the first sealing element 4. For details, please refer to the above, and it will not be repeated here.

[0063] In addition, a first groove may be provided on the side of the stop portion 22 facing the first surface 111. A part of the second seal 5 is embedded in the first groove, and another part may protrude from the stop portion 22, so that the first groove can play a positioning role in the assembly of the second seal 5 and can effectively improve the connection between the second seal 5 and the stop portion 22.

[0064] Optionally, a second groove may also be provided on the first surface 111 at a position corresponding to the second seal 5. When the valve core 2 is in the conducting position and the stop part 22 abuts against the first surface 111, the second seal 5 can seal against the bottom wall of the second groove. Thus, the inner space of the second groove can provide deformation space for the second seal 5, making the second seal 5 better seal the gap between the stop part 22 and the first surface 111.

[0065] In some embodiments, such as Figure 9 As shown, the valve body 1 includes an upper valve body 11 and a lower valve body 12 that are detachably connected. The upper valve body 11 and the lower valve body 12 enclose a chamber 16, and a third sealing element 6 is provided between the upper valve body 11 and the lower valve body 12. At this time, the first surface 111 can be the surface of the upper valve body 11 that is away from the lower valve body 12, and the second surface 121 can be the surface of the lower valve body 12 that is away from the upper valve body 11.

[0066] This makes the valve body 1 easy to manufacture and disassemble, facilitating subsequent maintenance. Furthermore, the third sealing element 6 seals the gap between the upper valve body 11 and the lower valve body 12, resulting in better sealing of the chamber 16 when the valve core 2 is in a sealed state, thus improving the sealing of the battery 20.

[0067] The implementation of the third sealing element 6 can be roughly the same as that of the first sealing element 4. For details, please refer to the above, and it will not be repeated here.

[0068] The detachable connection between the upper valve body 11 and the lower valve body 12 can be implemented in various ways. For example, the upper valve body 11 and the lower valve body 12 can be threaded together, which makes the connection between the upper valve body 11 and the lower valve body 12 easy to operate; or the upper valve body 11 and the lower valve body 12 can be bonded together with adhesive, which makes the connection between the upper valve body 11 and the lower valve body 12 more stable; or the upper valve body 11 and the lower valve body 12 can be snapped together, which is not limited here.

[0069] In addition, the plug part 14 and the lower valve body 12 can be integrally formed, or the plug part 14 and the lower valve body 12 can be pressure welded together, or the plug part 14 and the lower valve body 12 can be bonded together, and no limitation is made here.

[0070] Optionally, such as Figure 2 As shown, when the valve core 2 includes a main body 21 and a stop 22 connected to each other, and the valve body 1 includes an upper valve body 11 and a lower valve body 12 that are detachably connected, the reset member 3 can be connected between the lower valve body 12 and the stop 22. That is, one end of the reset member 3 can be connected to the lower valve body 12, and the other end can be connected to the stop 22, so that the reset member 3 can be set on the outside of the valve body 1, which facilitates the subsequent maintenance of the reset member 3.

[0071] Of course, in other embodiments, the reset member 3 may also be connected between the lower valve body 12 and the main body 21. That is, the reset member 3 may be located in the chamber 16, and one end of the reset member 3 may be connected to the inner wall of the chamber 16, and the other end may be connected to the main body 21.

[0072] The aforementioned reset component 3 includes any one of a spring, a rubber column, or a foam column. Therefore, the structure of the reset component 3 can be relatively simple, easy to obtain, and conducive to cost reduction.

[0073] For example, when the reset member 3 includes a spring, the spring extends along the first direction and can be sleeved on the lower valve body 12 of the valve body 1. One end of the spring is connected to the lower valve body 12, and the other end is connected to the stop portion 22. This makes it less likely for the spring to tilt during deformation, which is beneficial for the spring to provide a reset force for the valve core 2 along the first direction, thereby enabling the valve core 2 to slide from the conducting position to the sealing position more promptly. Specifically, a first flange can be provided on the outer peripheral wall of the lower valve body 12, and a second flange can be provided on the outer peripheral wall of the stop portion 22. One end of the spring can be connected to the first flange, and the other end can be connected to the second flange. The structure is simple and easy to implement.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A valve structure (10), characterized in that, include: A valve body (1) has a chamber (16). A first through hole (13) communicating with the chamber (16) is provided on the first surface (111) of the valve body (1). A plug-in part (14) is provided on the second surface (121) of the valve body (1). The plug-in part (14) is used to seal the liquid injection hole (210) of the battery (20). A second through hole (15) is provided in the plug-in part (14). The second through hole (15) is used to communicate with the internal space of the chamber (16) and the battery (20). The valve core (2) has an outer peripheral wall that slides with the first through hole (13). The valve core (2) has an air extraction hole (23) that penetrates the outer side of the valve core (2) facing the valve body (1) and the outer peripheral wall of the valve core (2). The valve core (2) has a sealing position and a conducting position. When the valve core (2) is in the sealing position, the hole wall of the first through hole (13) blocks the air extraction hole (23). When the valve core (2) is in the conducting position, the air extraction hole (23) communicates with the chamber (16). The reset member (3) is connected between the valve body (1) and the valve core (2) and is used to provide the valve core (2) with a reset force to slide from the open position to the sealed position.

2. The valve structure (10) according to claim 1, characterized in that, The first end of the air extraction hole (23) penetrates the outer side of the valve core (2) facing the valve body (1), and the second end of the air extraction hole (23) penetrates the outer peripheral wall of the valve core (2). When the valve core (2) is in the sealed position, the hole wall of the first through hole (13) blocks the second end. When the valve core (2) is in the open position, the second end of the air extraction hole (23) communicates with the chamber (16). The valve core (2) has a first end face (211) facing the cavity (16). The valve structure (10) also includes a first sealing element (4). The first sealing element (4) is arranged around the outer peripheral wall of the valve core (2) and is located between the second end of the air extraction hole (23) and the first end face (211) along the axial direction of the first through hole (13). When the valve core (2) is in the sealed position, the first sealing element (4) seals against the hole wall of the first through hole (13). When the valve core (2) is in the open position, the first sealing element (4) separates from the hole wall of the first through hole (13).

3. The valve structure (10) according to claim 2, characterized in that, The air extraction port (23) includes a first hole segment (231) and a second hole segment (232) that are interconnected. The first hole segment (231) extends axially along the first through hole (13). The end of the first hole segment (231) away from the second hole segment (232) passes through the outer side of the valve core (2) facing the valve body (1). The first end of the second hole segment (232) is connected to the first hole segment (231). The second end of the second hole segment (232) passes through the outer peripheral wall of the valve core (2). The second end of the second hole segment (232) is positioned closer to the first end face (211) than the first end of the second hole segment (232).

4. The valve structure (10) according to claim 3, characterized in that, The number of the second hole segments (232) is multiple, and the multiple second hole segments (232) are arranged at intervals around the outer peripheral wall of the valve core (2).

5. The valve structure (10) according to claim 2, characterized in that, The first through hole (13) includes a third hole segment (131) and a fourth hole segment (132) that are interconnected. The end of the third hole segment (131) away from the fourth hole segment (132) passes through the first surface (111). The third hole segment (131) slides with the outer peripheral wall of the valve core (2). The inner diameter of the fourth hole segment (132) is larger than the inner diameter of the third hole segment (131). When the valve core (2) is in the sealed position, the first sealing member (4) seals against the hole wall of the fourth hole segment (132). When the valve core (2) is in the open position, the first sealing member (4) separates from the hole wall of the fourth hole segment (132).

6. The valve structure (10) according to any one of claims 1-5, characterized in that, The valve core (2) includes: The main body (21) has a first end face (211) and a second end face that are axially opposite to each other along the first through hole (13). The second end face is disposed facing the inside of the chamber (16) and facing the outside of the valve body (1). The outer peripheral wall of the main body (21) is slidably engaged with the first through hole (13). The stop part (22) is disposed on the second end face, and the diameter of the largest outer circle of the stop part (22) is greater than the diameter of the first through hole (13). The first end of the air extraction hole (23) penetrates the side of the stop part (22) away from the main body part (21).

7. The valve structure (10) according to claim 6, characterized in that, When the valve core (2) is in the sealed position, there is a gap between the stop part (22) and the first surface (111). When the valve core (2) is in the open position, the stop part (22) abuts against the first surface (111).

8. The valve structure (10) according to claim 7, characterized in that, The stop part (22) is provided with a second seal (5) on the side facing the first surface (111), and the second seal (5) is used to seal against the first surface (111) when the valve core (2) is in the open position.

9. The valve structure (10) according to any one of claims 1-5, characterized in that, The reset component (3) includes any one of a spring, a rubber column, or a foam column.

10. The valve structure (10) according to any one of claims 1-5, characterized in that, The valve body (1) includes an upper valve body (11) and a lower valve body (12) that are detachably connected. The upper valve body (11) and the lower valve body (12) enclose the chamber (16). A third sealing element (6) is provided between the upper valve body (11) and the lower valve body (12).

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