Switch valve and battery production system

Abstract

According to the switch valve and the battery production system, the sealing part is designed to be in clearance fit with the liquid injection hole, so that the mounting body can be easily assembled in the liquid injection hole. The valve main body is at least partially inserted into the mounting hole, so that the sealing part is deformed and is in interference fit with the liquid injection hole, and therefore, during assembly, the sealing part of the mounting body can be firstly inserted into the liquid injection hole, and then the valve main body is inserted into the mounting hole, so that the mounting of the switch valve on the end cover can be quickly completed. Meanwhile, during disassembly, the switch valve can be released from being fixed on the end cover only by pulling out the valve main body from the mounting hole. By means of the design, the switch valve is convenient to disassemble and assemble, and the repeated utilization rate is high.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a switch valve and a battery production system. Background Art

[0002] During the manufacturing of battery cells, they go through exhaust and injection processes in sequence. To meet the requirements of exhaust and injection processes, a switch valve is generally set in the injection hole of the battery cell to control the sealing and opening of the injection hole. However, due to the structural design of the traditional switch valve, the switch valve is inconvenient to disassemble and assemble, and the reusability of the equipment is low. Utility Model Content

[0003] Based on this, it is necessary to provide a switch valve and a battery production system that are easy to disassemble and assemble and have a high reusability.

[0004] In the first aspect, the present application provides a switch valve, which includes: a mounting body, including a sealing portion for gap fitting with the injection hole on the end cover, and a mounting hole is penetrated through the sealing portion; a valve body, at least partially inserted into the mounting hole until the sealing portion is deformed, so that the deformed sealing portion has an interference fit with the injection hole, and the valve body is used to control the opening and closing of the injection hole.

[0005] In the above-mentioned switch valve, the sealing part is designed to have a clearance fit with the injection hole, so that the mounting body can be easily assembled in the injection hole. Since the valve body is at least partially inserted in the mounting hole, the sealing part can be deformed and have an interference fit with the injection hole. Therefore, during assembly, the sealing part of the mounting body can be first inserted into the injection hole, and then the valve body can be inserted into the mounting hole to quickly complete the installation of the switch valve on the end cover. At the same time, during disassembly, the switch valve can be released from the end cover by simply pulling the valve body out of the mounting hole. Such a design makes the disassembly and assembly of the switch valve convenient, and its reusability is high.

[0006] In some embodiments, the cross-sectional area of ​​the mounting hole gradually decreases along the insertion direction of the valve body. This design facilitates the sealing part to be more easily expanded after the valve body is inserted into the mounting hole, so that the sealing part is better expanded and tightened in the injection hole to achieve stable fixation of the switch valve.

[0007] In some embodiments, the circumferential side surface of the valve body includes an expansion surface, and the expansion surface is interference-fitted with the mounting hole. Such a design and introduction of the expansion surface facilitate the valve body to contact the hole wall of the mounting hole when plugged in, expand the sealing part, and make it better expand in the injection hole.

[0008] In some embodiments, the cross-sectional area of ​​the expansion surface gradually decreases along the insertion direction of the valve body. This design facilitates the sealing part to be more easily expanded after the valve body is inserted into the installation hole, so that the sealing part is better expanded in the injection hole to achieve stable fixation of the switch valve.

[0009] In some embodiments, the sealing part is provided with a first card groove on the circumferential side surface facing away from the mounting hole, and the first card groove is used to be inserted into the hole wall of the injection hole. With such a design, the first card groove is introduced on the circumferential side surface of the sealing part, so that when the sealing part is expanded in the injection hole, the first card groove is tightly engaged with the hole wall of the injection hole, further improving the bonding force between the sealing part and the end cover, and improving the stability of the assembly.

[0010] In some embodiments, one of the mounting body and the valve body is provided with a second slot, and the other is provided with a buckle protrusion, and the second slot cooperates with the buckle protrusion to limit the movement of the valve body along its own plug-in direction. With such a design, the buckle protrusion and the second slot are introduced to limit the movement of the valve body in the plug-in direction, making the installation of the valve body more stable, and reducing the risk of the valve body being ejected due to the positive pressure inside the battery cell; at the same time, the sealing part can be further tightened to improve the sealing performance of the end cover.

[0011] In some embodiments, the mounting body further includes a fixing portion connected to the sealing portion, wherein a receiving cavity communicating with the mounting hole is provided in the fixing portion, and the valve body is inserted into the receiving cavity and plugged into the mounting hole. With such a design, the fixing portion is introduced, which facilitates the valve body to be stably plugged into the mounting hole to achieve expansion and tightening of the sealing portion; at the same time, it is also convenient to stably support the valve body so that it can work stably.

[0012] In some embodiments, abutment portions are provided on the cavity wall of the accommodating cavity, and the abutment portions extend in an annular manner along the circumference of the accommodating cavity and abut against the valve body. In this design, the abutment portions are provided on the cavity wall of the accommodating cavity, which can improve the stability of the valve body in the mounting body; at the same time, the sealing between the valve body and the valve body is also achieved, further improving the sealing performance of the end cover.

[0013] In some embodiments, a contact portion is provided on the valve body, the contact portion is located on the side of the abutment portion facing the mounting hole, and has a withdrawal gap between the contact portion and the abutment portion in the plug-in direction of the valve body, and the contact portion is configured to abut against the abutment portion when the valve body is pulled out of the mounting hole. With such a design, a withdrawal gap is reserved between the contact portion and the abutment portion, so that when disassembling, the contact portion can abut against the abutment portion after the valve body withdraws from the mounting hole for a certain distance, so that the mounting body is driven by the valve body after being loosened, thereby making the disassembly of the switch valve easier and more convenient.

[0014] In some embodiments, the valve body includes a valve seat, a valve core and an elastic member, one end of the valve seat is inserted into the mounting hole, and a flow channel is provided through the valve seat, the valve core is provided in the flow channel through the elastic member, and is sealed against the inner wall of the end of the flow channel away from the mounting hole. With such a design, the valve core and the elastic member are introduced, which facilitates the valve core to move up and down in the flow channel, facilitates the blocking or unblocking of one end of the flow channel, and thus improves the convenience of opening and closing the injection hole.

[0015] In some embodiments, the valve core includes a blocking portion and an extrusion portion connected to the blocking portion. The blocking portion is disposed in the flow channel through an elastic member and abuts against the inner wall of one end of the flow channel away from the mounting hole. The extrusion portion at least partially extends out of the end of the flow channel away from the mounting hole. With such a design, the blocking portion and the extrusion portion are introduced, so that the blocking portion can block one end of the flow channel to achieve effective sealing; at the same time, the extrusion portion can be used to squeeze the blocking portion to achieve effective unblocking.

[0016] In some embodiments, the end of the extrusion part facing away from the blocking part has an extrusion groove, and the side thereof has an opening connected to the extrusion groove, and the opening is configured to connect the extrusion groove and the flow channel when pressed into the flow channel. In such a design, the extrusion groove is provided on the extrusion part, which facilitates pushing the extrusion part on the injection device and improves the convenience of the injection operation; at the same time, the opening is provided on the side of the extrusion part, which facilitates the electrolyte in the extrusion groove to enter the flow channel through the opening.

[0017] In some embodiments, the valve core further includes a connecting portion, which is connected to the side of the blocking portion facing away from the extrusion portion, and is connected to the elastic member. With such a design, the connecting portion is introduced to facilitate the connection between the valve core and the elastic member; at the same time, it is also convenient for the elastic member to transmit elastic force to the valve core, so that it abuts against the inner wall of the end of the flow channel to achieve effective sealing.

[0018] In some embodiments, a guide groove is provided on one end face of the connecting portion facing away from the extrusion portion, and a guide port connected to the guide groove is provided on the side face of the connecting portion. With such a design, the guide port and the guide groove are introduced to facilitate changing the path of the electrolyte inflow, so that the electrolyte is evenly distributed in the flow channel, which is conducive to improving the injection effect.

[0019] In some embodiments, the valve core further includes a sealing member, which is sleeved on the outside of the blocking portion and abuts against the inner wall of an end of the flow channel away from the mounting hole. In this design, the sealing member is arranged on the outside of the blocking portion, which is conducive to improving the sealing between the blocking portion and the inner wall of the end of the flow channel.

[0020] In some embodiments, the valve body further includes an anti-overflow portion, which is disposed on an end face of the valve seat away from the mounting hole and surrounds the outer periphery of the valve core. In this design, the anti-overflow portion is disposed on the end face of the valve seat to limit the electrolyte from overflowing from the valve core during the injection process, which not only reduces the loss of electrolyte, but also reduces the risk of corrosion to the equipment during the injection process.

[0021] In a second aspect, the present application provides a battery production system, the battery production system comprising any one of the above switching valves. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the structure of the switch valve and the end cover after assembly described in some embodiments of the present application.

[0023] Figure 2 for Figure 1 A cross-sectional view of the assembled structure is shown in FIG.

[0024] Figure 3 for Figure 1 Structural sectional view of the installation body in FIG.

[0025] Figure 4 for Figure 1 Structural sectional view of the valve body in FIG.

[0026] Figure 5 for Figure 1 Structural cross-sectional view of the end cover in FIG.

[0027] Figure 6 It is a structural cross-sectional view of the valve body described in other embodiments of the present application.

[0028] 100, switch valve; 10, mounting body; 11, sealing portion; 111, mounting hole; 112, first slot; 12, fixing portion; 121, accommodating cavity; 13, second slot; 131, supporting protrusion; 132, limiting protrusion; 133, guide surface; 14, abutting portion; 20, valve body; 21, valve seat; 211, first portion; 212, second portion; 213, flow channel; 21a, end; 214, contact portion; 215, installation step; 216, snap-on protrusion; 217, exit gap; 22, valve core; 221, sealing portion; 222, extrusion portion; 22a, extrusion groove; 22b, opening; 223, connecting portion; 22c, connecting strip; 22d, guide groove; 22e, guide port; 23, elastic member; 24, anti-overflow portion; 25, expansion surface; 26, sealing member; 200, end cover; 210, injection hole; 220, annular boss; X, plug-in direction. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0031] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0032] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0033] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0034] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0035] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0036] During the manufacturing of battery cells, they go through exhaust and injection processes in sequence. During the process of switching from exhaust to injection, the injection hole on the end cover of the battery cell remains open, resulting in a series of problems such as poor water isolation and low injection efficiency in the battery cell, which greatly limits the battery's production capacity.

[0037] For this purpose, a switch valve is generally provided in the injection hole, and the switch valve is used to control the opening and closing of the injection hole. For example: during the exhaust process, the switch valve opens the injection hole, allowing the moisture in the internal environment of the battery cell to evaporate and be discharged. After exhausting, the switch valve is used to close the injection hole, so that the battery cell is always in a sealed state during the transfer to the injection process, with a better water-proof effect, reducing the risk of water vapor in the environment entering the battery cell. When the injection process is required, the injection hole can be opened again through the switch valve.

[0038] However, the installation of the conventional switch valve on the injection hole is usually fixed by welding or interference clamping, which makes the disassembly and installation operations very difficult and the reusability of the equipment is low.

[0039] Based on this, in order to solve the problems of difficulty in disassembling and assembling the switch valve and low reusability, the present application provides a switch valve, in which the sealing part is designed to have a clearance fit with the injection hole, so that the mounting body can be easily assembled in the injection hole. Since the valve body is at least partially inserted in the mounting hole, the sealing part can be deformed and have an interference fit with the injection hole. Therefore, during assembly, the sealing part of the mounting body can be inserted into the injection hole first, and then the valve body can be inserted into the mounting hole to quickly complete the installation of the switch valve on the end cover. At the same time, during disassembly, the switch valve can be released from the end cover by simply pulling the valve body out of the mounting hole. Such a design makes the switch valve easy to disassemble and assemble, and its reusability is high.

[0040] According to some embodiments of this application, please refer to Figure 1 and Figure 2 The present application provides a switch valve 100, which includes: a mounting body 10 and a valve body 20. The mounting body 10 includes a sealing portion 11 for gap-matching with a liquid injection hole 210 on an end cover 200, and a mounting hole 111 is provided through the sealing portion 11. The valve body 20 is at least partially inserted into the mounting hole 111 until the sealing portion 11 is deformed, so that the deformed sealing portion 11 is interference-fitted with the liquid injection hole 210, and the valve body 20 is used to control the opening and closing of the liquid injection hole 210.

[0041] The mounting body 10 refers to a structure that enables the valve body 20 to be installed in the injection hole 210. During assembly, the sealing portion 11 of the mounting body 10 can be installed in the injection hole 210; after pre-installation, the valve body 20 is inserted into the mounting hole 111 of the sealing portion 11. Since there is a clearance fit between the sealing portion 11 and the injection hole 210, the sealing portion 11 can be easily installed in or removed from the injection hole 210.

[0042] The clearance fit means that after the sealing part 11 is installed in the mounting hole 111 , a certain gap is left between the sealing part 11 and the hole wall of the mounting hole 111 .

[0043] The valve body 20 refers to a structure that can control the opening or closing of the injection hole 210, and its structure can have various designs. For example, the valve body 20 can be designed to use elastic force to block one end of the flow channel 213; it can also be designed to have a movable valve structure, such as: rotating the valve can open or close one end of the flow channel 213 in the valve body 20, etc.

[0044] When the valve body 20 is at least partially inserted into the mounting hole 111, the sealing part 11 can be deformed, enlarged, and expanded in the injection hole 210 to achieve interference fit. In order to make the sealing part 11 deform under the action of the valve body 20, the material of the sealing part 11 can be selected to have a certain elastic function, such as rubber. At the same time, the size of the part of the valve body 20 inserted into the mounting hole 111 should be larger than the corresponding size in the mounting hole 111.

[0045] In addition, the end cap 200 refers to a component that covers the opening 22b of the shell to isolate the internal environment of the battery cell from the external environment. Without limitation, the shape of the end cap 200 can be adapted to the shape of the shell to match the shell. Optionally, the end cap 200 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 200 is not easily deformed when squeezed and collided, so that the battery cell can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals can be provided on the end cap 200. The electrode terminal can be used to electrically connect to the battery cell assembly for outputting or inputting electrical energy of the battery cell. The injection hole 210 is set through the thickness direction of the end cap 200 for injecting electrolyte into the battery cell.

[0046] Such a design makes it easy to assemble and disassemble the switch valve 100, and its reusability is high.

[0047] According to some embodiments of the present application, optionally, please refer to Figure 3 The cross-sectional area of ​​the mounting hole 111 gradually decreases along the plugging direction X of the valve body 20 .

[0048] The cross section of the mounting hole 111 refers to the cross section of the mounting hole 111 formed by cutting the mounting hole 111 with a plane perpendicular to the insertion direction X of the valve body 20, and forming a ring-shaped contour line on the hole wall of the mounting hole 111. The area enclosed by the contour line is the cross section of the mounting hole 111. For ease of understanding, it can be Figure 3 Taking the example as an example, the cross section of the mounting hole 111 is Figure 3 The area indicated by S1.

[0049] The cross-sectional area of ​​the mounting hole 111 gradually decreases along the insertion direction X, indicating that as the valve body 20 is inserted deeper into the mounting hole 111, the extrusion force of the valve body 20 on the mounting hole 111 becomes greater, the deformation of the sealing portion 11 becomes greater, and the expansion degree thereof in the injection hole 210 becomes greater. Specifically, in some embodiments, the hole wall of the mounting hole 111 is approximately a conical hole wall.

[0050] Such a design makes it easier to expand the sealing portion 11 after the valve body 20 is inserted into the mounting hole 111 , so that the sealing portion 11 is better expanded and tightened in the injection hole 210 , thereby achieving stable fixation of the switch valve 100 .

[0051] According to some embodiments of the present application, optionally, please refer to Figure 2 The circumferential side surface of the valve body 20 includes a tightening surface 25 , and the tightening surface 25 is interference fit with the mounting hole 111 .

[0052] The expansion surface 25 refers to the annular surface on the circumferential side of the valve body 20 . When the valve body 20 is inserted into the mounting hole 111 , the expansion surface 25 contacts the hole wall of the mounting hole 111 and expands the mounting hole 111 , causing the sealing part 11 to undergo structural deformation and expand in the injection hole 210 .

[0053] The expansion surface 25 can have various designs. For example, the expansion surface 25 can be a cylindrical surface or a conical surface; or, the expansion surface 25 can be an annular convex surface protruding outward on the circumferential side surface of the valve body 20.

[0054] With such a design, the expansion surface 25 is introduced, so that the valve body 20 can be easily contacted with the hole wall of the installation hole 111 when plugged in, and the sealing part 11 is stretched open so that it can be better expanded in the injection hole 210.

[0055] According to some embodiments of the present application, optionally, please refer to Figure 4 The cross-sectional area of ​​the expansion surface 25 gradually decreases along the plug-in direction X of the valve body 20 .

[0056] The cross section of the expansion surface 25 refers to the expansion surface 25 cut by a plane perpendicular to the plugging direction X of the valve body 20, forming a ring-shaped contour line on the expansion surface 25, and the area enclosed by the contour line is the cross section of the expansion surface 25. For ease of understanding, it can be Figure 4 Taking the example as an example, the cross section of the expansion surface 25 is Figure 4 The area indicated by S2.

[0057] The cross-sectional area of ​​the expansion surface 25 gradually decreases along the insertion direction X, indicating that as the valve body 20 is inserted deeper into the mounting hole 111, the squeezing force of the expansion surface 25 on the mounting hole 111 becomes greater, the deformation of the sealing portion 11 becomes greater, and the degree of expansion thereof in the injection hole 210 becomes greater. Specifically, in some embodiments, the cross-sectional area of ​​the mounting hole 111 gradually decreases along the insertion direction X of the valve body 20, and the size of the expansion surface 25 is greater than the size of the mounting hole 111.

[0058] Such a design makes it easier to expand the sealing portion 11 after the valve body 20 is inserted into the mounting hole 111 , so that the sealing portion 11 is better expanded and tightened in the injection hole 210 , thereby achieving stable fixation of the switch valve 100 .

[0059] According to some embodiments of the present application, optionally, please refer to Figure 2 and Figure 3 A first card groove 112 is provided on the circumferential side surface of the sealing portion 11 facing away from the mounting hole 111 , and the first card groove 112 is used to be inserted into the hole wall of the injection hole 210 .

[0060] The first groove 112 refers to a structure formed by the inward depression of the circumferential side surface of the sealing part 11. When the sealing part 11 is inserted into the injection hole 210, the hole wall of the injection hole 210 is inserted into the first groove 112. The first groove 112 can be an annular groove or a non-annular groove. When the first groove 112 is a non-annular groove, the hole wall of the injection hole 210 has at least a protruding structure that can be inserted into the first groove 112. When the first groove 112 is an annular groove, the circumferential hole wall of the injection hole 210 can be inserted into the annular groove.

[0061] For specific embodiments, please refer to Figure 5 The injection hole 210 is a countersunk structure, that is, an annular boss 220 is protrudingly provided on the hole wall of the injection hole 210, and the annular boss 220 is inserted into the first slot 112.

[0062] With such a design, a first card groove 112 is introduced on the circumferential side of the sealing part 11, so that when the sealing part 11 is expanded and tightened in the injection hole 210, the first card groove 112 is tightly engaged with the hole wall of the injection hole 210, further improving the bonding force between the sealing part 11 and the end cover 200 and enhancing the stability of the assembly.

[0063] According to some embodiments of the present application, optionally, please refer to Figure 3 and Figure 4 Among the mounting body 10 and the valve body 20, one of them is provided with a second card slot 13, and the other is provided with a card buckle protrusion 216. The second card slot 13 cooperates with the card buckle protrusion 216 to limit the movement of the valve body 20 along its own plug-in direction X.

[0064] The second clamping groove 13 can be provided on the mounting body 10, and the clamping protrusion 216 can be provided on the valve body 20; or, the second clamping groove 13 can be provided on the valve body 20, and the clamping protrusion 216 can be provided on the mounting body 10. When the second clamping groove 13 is provided on the mounting body 10, after the valve body 20 is inserted into the mounting hole 111, the clamping protrusion 216 thereon is clamped into the second clamping groove 13, so as to quickly complete the assembly.

[0065] The number of the buckle protrusion 216 and the second clamping groove 13 can be one or more. When the number of the buckle protrusion 216 and the second clamping groove 13 are both more than one, the buckle protrusion 216 and the second clamping groove 13 can be matched one to one. At the same time, all the second clamping grooves 13 can be distributed around the outer periphery of the mounting hole 111 at intervals, so that the valve body 20 can be inserted into the sealing part 11 more stably.

[0066] Such a design introduces the snap protrusion 216 and the second snap groove 13 to limit the movement of the valve body 20 in the plug-in direction X, making the installation of the valve body 20 more stable and reducing the risk of the valve body 20 being ejected due to the positive pressure inside the battery cell; at the same time, the sealing part 11 can be further tightened to improve the sealing performance of the end cover 200.

[0067] According to some embodiments of the present application, optionally, please refer to Figure 2 and Figure 3 The mounting body 10 further includes a fixing portion 12 connected to the sealing portion 11 , and a receiving cavity 121 communicating with the mounting hole 111 is disposed in the fixing portion 12 . The valve body 20 is disposed in the receiving cavity 121 and inserted into the mounting hole 111 .

[0068] The fixing part 12 refers to a structure that can be used for the partial fixed installation of the valve body 20, and has an accommodating cavity 121 inside. The accommodating cavity 121 runs through the fixing part 12, and one end of the accommodating cavity 121 is connected to the mounting hole 111, and the other end is connected to the outside. In this way, during assembly, the valve body 20 can be inserted from one end of the accommodating cavity 121 and thus inserted into the mounting hole 111. At this time, a part of the valve body 20 is located in the accommodating cavity 121. In addition, the size of the end of the accommodating cavity 121 that is connected to the mounting hole 111 is larger than the size of the mounting hole 111, so that a step structure can be formed between the accommodating cavity 121 and the mounting hole 111, which can limit the insertion depth of the valve body 20.

[0069] The fixing portion 12 and the sealing portion 11 may be connected by a combination of methods, such as welding, clamping, pinning, bolting, etc.; or an integrated structural design may be adopted, such as injection molding, die casting, 3D technology, etc.

[0070] In some embodiments, please refer to Figure 3 The mounting body 10 may further include a supporting protrusion 131 and a limiting protrusion 132, wherein the supporting protrusion 131 is disposed on an end surface of the fixing portion 12 facing away from the sealing portion 11, and the limiting protrusion 132 is disposed on a side of the supporting protrusion 131 facing the accommodating cavity 121, and a second clamping groove 13 is formed between the limiting protrusion 132, the supporting protrusion 131 and the fixing portion 12. A side surface of the limiting protrusion 132 facing the second clamping groove 13 abuts against the buckle protrusion 216 on the valve body 20 in the plug-in direction X.

[0071] At the same time, in order to facilitate the valve body 20 to be plugged in, the snap protrusion 216 can be easily inserted into the second slot 13, and at least one of the side of the limiting protrusion 132 facing away from the second slot 13 and the side of the snap protrusion 216 facing the mounting hole 111 includes an inclined guide surface 133, and the end of the guide surface 133 away from the mounting hole 111 is higher than the end of the guide surface 133 close to the mounting hole 111.

[0072] Such a design introduces the fixing portion 12, which facilitates the valve body 20 to be stably inserted into the mounting hole 111 to achieve expansion and tightening of the sealing portion 11; at the same time, it is also convenient to stably support the valve body 20 so that it can work stably.

[0073] According to some embodiments of the present application, optionally, please refer to Figure 2 An abutment portion 14 is protruded from the cavity wall of the accommodating cavity 121 . The abutment portion 14 extends in a circular shape along the circumference of the accommodating cavity 121 and abuts against the valve body 20 .

[0074] The abutment portion 14 extends in a circular shape along the circumference of the accommodating cavity 121, indicating that the abutment portion 14 is an annular structure. When the valve body 20 penetrates into the accommodating cavity 121, the abutment portion 14 abuts against the side of the valve body 20, which can not only support the valve body 20 so that it can be stably inserted in the mounting hole 111; but also achieve sealing between the valve body 20, thus forming a double seal with the seal between the valve body 20 and the mounting hole 111.

[0075] With such a design, the abutment portion 14 is provided on the cavity wall of the accommodating cavity 121 , which can improve the fixing stability of the valve body 20 in the mounting body 10 ; at the same time, it also achieves sealing with the valve body 20 , further improving the sealing performance of the end cover 200 .

[0076] According to some embodiments of the present application, optionally, please refer to Figure 2 The valve body 20 is provided with a contact portion 214, which is located on the side of the abutment portion 14 facing the mounting hole 111, and has an exit gap 217 between the abutment portion 14 and the valve body 20 in the insertion direction X. The contact portion 214 is configured to abut against the abutment portion 14 when the valve body 20 is pulled out of the mounting hole 111.

[0077] In the plugging direction X, there is a withdrawal gap 217 between the contact portion 214 and the abutting portion 14, and the withdrawal gap 217 allows the valve body 20 to withdraw from the mounting hole 111 for a distance in the direction opposite to the plugging direction X. When the valve body 20 withdraws from the mounting hole 111 for a distance, the degree of expansion of the sealing portion 11 by the valve body 20 is weakened, and the degree of deformation becomes smaller, so that the sealing portion 11 is loose in the injection hole 210 and is easily pulled out of the injection hole 210. The size of the withdrawal gap 217 can be determined according to the actual dimensions of the actual valve body 20 and the mounting body 10.

[0078] The structure of the contact portion 214 may be designed in various ways. For example, the contact portion 214 may be a raised structure on the valve body 20 or a raised annular structure.

[0079] For specific embodiments, please refer to Figure 4 The valve body 20 includes a first portion 211 and a second portion 212, and the second portion 212 is sleeved outside one end of the first portion 211. The second portion 212 is inserted into the mounting hole 111, and one end surface of the second portion 212 sleeved outside the first portion 211 is a contact portion 214. In this way, when the valve body 20 withdraws from the mounting hole 111, the contact portion 214 can abut against the abutting portion 14 and drive the mounting body 10 from the injection hole 210.

[0080] With such a design, an exit gap 217 is reserved between the contact portion 214 and the abutment portion 14, so that during disassembly, the contact portion 214 can abut against the abutment portion 14 after the valve body 20 exits the mounting hole 111 for a certain distance, so that the mounting body 10 is loosened and driven by the valve body 20, thereby making the disassembly of the switch valve 100 easier and more convenient.

[0081] According to some embodiments of the present application, optionally, please refer to Figure 4 The valve body 20 includes a valve seat 21, a valve core 22 and an elastic member 23. One end of the valve seat 21 is inserted into the mounting hole 111, and a flow channel 213 is penetrated therethrough. The valve core 22 is disposed in the flow channel 213 through the elastic member 23, and is sealed against the inner wall of an end 21a of the flow channel 213 away from the mounting hole 111.

[0082] The valve seat 21 refers to the structure in which the valve body 20 is installed in the mounting body 10, which is equivalent to the shell structure in the valve body 20. There are many structural designs, which can be designed as an integrated structure or a combined structure. For example: the valve body 20 can include a first part 211 and a second part 212, the second part 212 is sleeved on one end of the first part 211, and the flow channel 213 runs through the first part 211 and the second part 212.

[0083] The flow channel 213 is a structure that allows gas in the battery cell to pass through and be discharged, or allows external electrolyte to pass through and be injected into the battery cell. The valve core 22 is arranged in the flow channel 213 through the elastic member 23, which means that the valve core 22 can move elastically up and down in the flow channel 213.

[0084] When the switch valve 100 needs to close the injection hole 210, the valve core 22 abuts against the inner wall of one end 21a of the flow channel 213 under the action of the elastic member 23, closing the connection between the flow channel 213 and the outside. At this time, external water vapor cannot enter the battery cell through the flow channel 213, thereby improving the water-proof effect of the battery cell.

[0085] When the switch valve 100 needs to open the injection hole 210, the valve core 22 is pressed into the flow channel 213 by external force, and the blockage of the inner wall of one end 21a of the flow channel 213 is released, so that the flow channel 213 is connected to the outside. At this time, during the baking process, the gas in the battery cell can be discharged through the injection hole 210 and the flow channel 213; during the injection process, the electrolyte can flow into the battery cell from the flow channel 213 and the injection hole 210.

[0086] The end 21a of the flow channel 213 refers to the portion of the flow channel 213 close to its own port, which has a distance in the length direction of the flow channel 213, and the size of the distance can be set according to different needs. In order to facilitate the valve core 22 to abut against the inner wall of the end 21a of the flow channel 213, a step structure can be set on the inner wall of the end 21a of the flow channel 213, and the cross-sectional area of ​​the inner wall of the end 21a can also be designed to be smaller as it is closer to the port.

[0087] In addition, the elastic member 23 may be a spring, or an elastic rubber; or, it may be an elastic metal sheet. The elastic member 23 may be in a compressed state in the flow channel 213; or it may be in a stretched state. When the elastic member 23 is in a stretched state, the valve core 22 abuts against the inner wall of one end 21a of the flow channel 213 under the action of the pulling force. In some specific embodiments, a mounting step 215 is provided on the inner wall of the flow channel 213, and the elastic member 23 abuts between the mounting step 215 and the valve core 22.

[0088] Such a design introduces the valve core 22 and the elastic member 23, which facilitates the valve core 22 to move up and down in the flow channel 213, and facilitates the blocking or unblocking of one end 21a of the flow channel 213, thereby improving the convenience of the opening and closing operation of the injection hole 210.

[0089] According to some embodiments of the present application, optionally, please refer to Figure 4 The valve core 22 includes a sealing portion 221 and an extrusion portion 222 connected to the sealing portion 221. The sealing portion 221 is arranged in the flow channel 213 through the elastic member 23, and abuts against the inner wall of an end portion 21a of the flow channel 213 away from the mounting hole 111. The extrusion portion 222 at least partially extends out of the end portion 21a of the flow channel 213 away from the mounting hole 111.

[0090] The blocking portion 221 refers to a structure that will seal and abut against the inner wall of one end 21a of the flow channel 213 when the injection hole 210 needs to be blocked, so that the injection hole 210 is disconnected from the outside. The extrusion portion 222 refers to a structure that can push the blocking portion 221 under the action of external force when the injection hole 210 needs to be opened, so that the blocking portion 221 is released from the abutment with the inner wall of one end 21a of the flow channel 213. For example: during the injection process, the extrusion portion 222 is pressed to drive the blocking portion 221 to move to the inside of the flow channel 213, and release the blocking of the end 21a of the flow channel 213 by the blocking portion 221; when the extrusion portion 222 is not pressed, the elastic member 23 drives the blocking portion 221 to return to the initial position and re-seal the end 21a of the flow channel 213. At this time, the extrusion portion 222 at least partially extends out of the flow channel 213, which is convenient for the subsequent extrusion of the extrusion portion 222 for injection.

[0091] The blocking portion 221 and the extruding portion 222 may be connected by bolt connection, bonding, welding, pin connection, clamping, etc.; the two may also be designed as an integrated structure.

[0092] With such a design, the blocking portion 221 and the extrusion portion 222 are introduced, so that the blocking portion 221 can block one end portion 21a of the flow channel 213 to achieve effective sealing; at the same time, the extrusion portion 222 can be used to extrude the blocking portion 221 to achieve effective unblocking.

[0093] According to some embodiments of the present application, optionally, please refer to Figure 4 The extrusion portion 222 has an extrusion groove 22a at one end facing away from the blocking portion 221, and its side has an opening 22b connected to the extrusion groove 22a. The opening 22b is configured to connect the extrusion groove 22a and the flow channel 213 when pressed into the flow channel 213.

[0094] When the injection hole 210 is opened, the injection device can be inserted into the extrusion groove 22a, and the extrusion part 222 can be pushed into the flow channel 213, so that the opening 22b on the extrusion part 222 is pressed into the flow channel 213. At this time, the flow channel 213 is connected with the extrusion groove 22a through the opening 22b. In this way, the electrolyte can be injected into the extrusion groove 22a to achieve the electrolyte flowing into the battery cell through the flow channel 213.

[0095] It should be noted that when the opening 22b is at least partially pressed into the flow channel 213, a certain gap is provided between a side surface of the opening 22b of the extrusion portion 222 and an inner wall of the flow channel 213, so that the extrusion groove 22a can maintain communication with the flow channel 213 through the opening 22b.

[0096] The number of the openings 22b can be one or more. When the number of the openings 22b is more than one, all the openings 22b can be distributed at intervals around the periphery of the extrusion groove 22a, so that the liquid injection can be more uniform.

[0097] With such a design, an extrusion groove 22a is provided on the extrusion portion 222, which facilitates pushing the extrusion portion 222 on the injection device and improves the convenience of the injection operation; at the same time, an opening 22b is provided on the side of the extrusion portion 222 to facilitate the electrolyte in the extrusion groove 22a to enter the flow channel 213 through the opening 22b.

[0098] According to some embodiments of the present application, optionally, please refer to Figure 4 The valve core 22 further includes a connecting portion 223 , which is connected to a side of the blocking portion 221 facing away from the extruding portion 222 , and is connected to the elastic member 23 .

[0099] The connecting portion 223 refers to a component that connects the valve core 22 and the elastic member 23 . The connection between the connecting portion 223 and the elastic member 23 may be achieved by bonding, sleeve connection, clamping, etc.

[0100] Such a design introduces the connecting portion 223, which facilitates the connection between the valve core 22 and the elastic member 23; at the same time, it also facilitates the elastic member 23 to transmit elastic force to the valve core 22, so that it abuts against the inner wall of the end 21a of the flow channel 213 to achieve effective sealing.

[0101] According to some embodiments of the present application, optionally, please refer to Figure 4 A guide groove 22d is provided on one end surface of the connecting portion 223 facing away from the extruding portion 222, and a guide port 22e communicating with the guide groove 22d is provided on the side surface of the connecting portion 223.

[0102] The guide groove 22d refers to a structure formed by an inward depression of one end surface of the connection portion 223. During the injection process, the electrolyte flows into the flow channel 213 from between the blocking portion 221 and the inner wall of the flow channel 213, which causes the electrolyte flowing in to be mainly distributed in the circumferential direction. For this reason, a guide port 22e is provided on the side of the connection portion 223. When the electrolyte flows in from between the blocking portion 221 and the inner wall of the flow channel 213, part of the electrolyte will flow from the guide port 22e into the guide groove 22d, and then flow from the guide groove 22d into the middle of the flow channel 213.

[0103] Optionally, the number of the guide ports 22e may be one or more. When the number of the guide ports 22e is more than one, all the guide ports 22e may be spaced around the periphery of the guide groove 22d, so that the injection can be more uniform. Specifically in some embodiments, the connecting portion 223 includes a plurality of connecting strips 22c, all of which are spaced annularly distributed circumferentially on the side of the sealing portion 221 facing away from the extrusion portion 222, and enclosed to form a guide groove 22d. At the same time, there is a guide port 22e between two adjacent connecting strips 22c.

[0104] With such a design, the guide port 22e and the guide groove 22d are introduced to change the path of the electrolyte inflow, so that the electrolyte is evenly distributed in the flow channel 213, which is beneficial to improving the injection effect.

[0105] According to some embodiments of the present application, optionally, please refer to Figure 4 The valve core 22 further includes a sealing member 26 , which is sleeved on the outside of the blocking portion 221 and abuts against the inner wall of an end portion 21 a of the flow channel 213 away from the mounting hole 111 .

[0106] The seal 26 is a structure that seals against the inner wall of the end 21a of the flow channel 213, and can be but not limited to a rubber ring, etc. To make the installation structure of the seal 26 on the blocking part 221 more stable, a groove can be provided outside the blocking part 221, and the seal 26 is embedded in the groove.

[0107] With such a design, a sealing member 26 is provided outside the blocking portion 221 , which is beneficial to improving the sealing performance between the blocking portion 221 and the inner wall of the end portion 21 a of the flow channel 213 .

[0108] According to some embodiments of the present application, optionally, please refer to Figure 6 The valve body 20 further includes an overflow prevention portion 24 , which is disposed on an end surface of the valve seat 21 away from the mounting hole 111 and surrounds the outer periphery of the valve core 22 .

[0109] The anti-overflow portion 24 is a structure that can limit the electrolyte from overflowing from the valve core 22 during the injection process. The anti-overflow portion 24 is designed as a ring-shaped structure on the valve seat 21. The shape of the anti-overflow portion 24 can be designed in a variety of ways, not limited to the shape shown in the figure, but also other shapes, for example: the anti-overflow portion 24 can be but not limited to a cylindrical structure.

[0110] With such a design, an anti-overflow portion 24 is provided on the end surface of the valve seat 21, which can limit the electrolyte from overflowing from the valve core 22 during the injection process, thereby reducing not only the loss of electrolyte but also the risk of corrosion to the equipment during the injection process.

[0111] According to some embodiments of the present application, the present application provides a battery production system, and the battery production system includes the switch valve 100 of any one of the above items.

[0112] According to some embodiments of this application, please refer to Figures 1 to 6 The present application provides a switch valve 100, which includes a mounting body 10 and a valve body 20. The mounting body 10 includes a fixing portion 12, a sealing portion 11 provided at one end of the fixing portion 12, and a second clamping groove 13 provided at the other end of the fixing portion 12. The sealing portion 11 is clearance-matched with a liquid injection hole 210. The valve body 20 includes a valve seat 21 having a flow channel 213, a valve core 22, and an elastic member 23. The valve core 22 is arranged in the flow channel 213 through the elastic member 23. When one end of the valve seat 21 is inserted into the sealing portion 11, the sealing portion 11 can be expanded so that the sealing portion 11 and the liquid injection hole 210 are interference-matched.

[0113] During assembly, the mounting body 10 and the valve body 20 can be preassembled, such as: the valve body 20 is inserted into the fixing portion 12, but is not completely inserted into the mounting hole 111 of the sealing portion 11. Next, the sealing portion 11 of the mounting body 10 is installed into the injection hole 210, and at this time, the sealing portion 11 and the injection hole 210 are in a clearance fit; then, the valve body 20 is pressed down, so that the buckle protrusion 216 on the valve body 20 is stuck in the second card groove 13, and at this time, one end of the valve body 20 is inserted into the mounting hole 111, so that the sealing portion 11 is deformed and expanded in the injection hole 210.

[0114] During disassembly, there is a withdrawal gap 217 between the contact portion 214 of the valve body 20 and the abutment portion 14 in the fixing portion 12, so that after the valve body 20 is withdrawn from the mounting hole 111 for a certain distance, the contact portion 214 contacts the abutment portion 14, and the degree of expansion of the sealing portion 11 by the valve body 20 is reduced, so that the sealing portion 11 and the injection hole 210 are again in a clearance fit. In this way, the mounting body 10 can be easily taken out of the injection hole 210 by continuing to pull out the valve body 20.

[0115] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0116] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A switch valve, characterized in that: The switch valve comprises: The mounting body (10) comprises a sealing portion (11) for gap-matching with the liquid injection hole (210) on the end cover (200), wherein the sealing portion (11) is provided with a mounting hole (111) extending therethrough; The valve body (20) is at least partially inserted into the mounting hole (111) until the sealing portion (11) is deformed, so that the deformed sealing portion (11) is interference-fitted with the injection hole (210), and the valve body (20) is used to control the opening and closing of the injection hole (210).

2. The switch valve according to claim 1, characterized in that: The cross-sectional area of ​​the mounting hole (111) gradually decreases along the plugging direction (X) of the valve body (20).

3. The switch valve according to claim 1, characterized in that: The circumferential side surface of the valve body (20) comprises an expansion surface (25), and the expansion surface (25) is interference-fitted with the mounting hole (111).

4. The switch valve according to claim 3, characterized in that: The cross-sectional area of ​​the expansion surface (25) gradually decreases along the plug-in direction (X) of the valve body (20).

5. The switch valve according to claim 1, characterized in that: The sealing portion (11) is provided with a first clamping groove (112) on the circumferential side surface facing away from the mounting hole (111), and the first clamping groove (112) is used to be clamped into the hole wall of the injection hole (210).

6. The switch valve according to claim 1, characterized in that: One of the mounting body (10) and the valve body (20) is provided with a second slot (13), and the other is provided with a buckle protrusion (216); the second slot (13) cooperates with the buckle protrusion (216) to limit the movement of the valve body (20) along its own plug-in direction (X).

7. The switch valve according to any one of claims 1 to 6, characterized in that: The mounting body (10) further comprises a fixing portion (12) connected to the sealing portion (11); a receiving cavity (121) communicating with the mounting hole (111) is provided in the fixing portion (12); the valve body (20) is inserted into the receiving cavity (121) and inserted into the mounting hole (111).

8. The switch valve according to claim 7, characterized in that: An abutment portion (14) is protruded on the cavity wall of the accommodating cavity (121), and the abutment portion (14) extends in an annular shape along the circumference of the accommodating cavity (121) and abuts against the valve body (20).

9. The switch valve according to claim 8, characterized in that: The valve body (20) is provided with a contact portion (214), which is located on the side of the abutment portion (14) facing the mounting hole (111) and has an exit gap (217) between the valve body (20) and the abutment portion (14) in the insertion direction (X) of the valve body (20), and the contact portion (214) is configured to abut against the abutment portion (14) when the valve body (20) is pulled out of the mounting hole (111).

10. The switch valve according to any one of claims 1 to 6, characterized in that: The valve body (20) comprises a valve seat (21), a valve core (22) and an elastic member (23); one end of the valve seat (21) is inserted into the mounting hole (111), and a flow channel (213) is provided therethrough; the valve core (22) is arranged in the flow channel (213) through the elastic member (23), and is sealed against an inner wall of an end portion (21a) of the flow channel (213) away from the mounting hole (111).

11. The switch valve according to claim 10, characterized in that: The valve core (22) comprises a blocking portion (221) and an extrusion portion (222) connected to the blocking portion (221); the blocking portion (221) is disposed in the flow channel (213) through the elastic member (23) and abuts against an inner wall of an end portion (21a) of the flow channel (213) away from the mounting hole (111); and the extrusion portion (222) at least partially extends out of an end portion (21a) of the flow channel (213) away from the mounting hole (111).

12. The switch valve according to claim 11, characterized in that: The extrusion portion (222) has an extrusion groove (22a) at one end facing away from the blocking portion (221), and a side surface thereof has an opening (22b) connected to the extrusion groove (22a), and the opening (22b) is configured to connect the extrusion groove (22a) and the flow channel (213) when pressed into the flow channel (213).

13. The switch valve according to claim 11, characterized in that: The valve core (22) further comprises a connecting portion (223), wherein the connecting portion (223) is connected to a side of the blocking portion (221) facing away from the extrusion portion (222), and the connecting portion (223) is connected to the elastic member (23).

14. The switch valve according to claim 13, characterized in that: A guide groove (22d) is provided on one end surface of the connecting portion (223) facing away from the extruding portion (222), and a guide port (22e) communicating with the guide groove (22d) is provided on a side surface of the connecting portion (223).

15. The switch valve according to claim 11, characterized in that: The valve core (22) further comprises a sealing member (26), wherein the sealing member (26) is sleeved on the outside of the blocking portion (221) and abuts against the inner wall of an end portion (21a) of the flow channel (213) away from the mounting hole (111).

16. The switch valve according to claim 10, characterized in that: The valve body (20) further comprises an anti-overflow portion (24), wherein the anti-overflow portion (24) is arranged on an end surface of the valve seat (21) away from the mounting hole (111) and is arranged around the outer periphery of the valve core (22).

17. A battery production system, characterized in that: The battery production system comprises the switch valve according to any one of claims 1-16.

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