Valve assembly and battery production device

Abstract

According to the valve assembly and the battery production device, in the liquid injection or exhaust process, thrust can be applied to the valve body through the valve element, the valve body is pushed, so that an overflowing channel communicates with the interior of a single battery, and at the moment, a medium can be injected into the single battery through a flow guide channel and the overflowing channel; or the battery cells are arranged outside the battery cells. When the overflowing channel is communicated with the interior of the single battery, the first sealing surface is in sealing contact with the second sealing surface, so that the valve core is in sealing fit with the valve body, electrolyte cannot seep between the valve body and the valve core due to the pressure in the single battery when the valve is opened, the reverse seeping probability of the electrolyte in the electrolyte injection process is effectively reduced, and the service life of the electrolyte is prolonged. The liquid injection operation is normally carried out; and meanwhile, the pollution to the battery monomers is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of battery production, in particular to a valve assembly and a battery production device. BACKGROUND

[0002] When a battery cell is manufactured, it will sequentially go through the processes of exhausting and liquid injection. In order to facilitate the exhausting or liquid injection operation, a switch valve is generally arranged on the battery cell to connect the inside of the battery cell with the outside. However, during the liquid injection process, the electrolyte is easily back-seeped from the switch valve due to the pressure inside the battery cell, which not only affects the normal progress of the liquid injection operation, but also easily pollutes the outside of the battery cell. CONTENT OF THE UTILITY MODEL

[0003] Therefore, it is necessary to provide a valve assembly and a battery production device to reduce the probability of back-seepage of the electrolyte during the liquid injection process, so that the liquid injection operation can be normally performed, and the pollution to the battery cell is reduced.

[0004] In a first aspect, the present application provides a valve assembly for being assembled in a through hole of a battery cell, the valve assembly comprising: a valve body for being sealingly arranged in the through hole, and the valve body comprising a flow passage and a first sealing surface arranged around an outer periphery of the flow passage; and a valve core comprising a flow guide passage for connecting the outside of the battery cell with the flow passage and a second sealing surface arranged around an outer periphery of the flow guide passage; wherein, in a case that the valve core is controlled to push the valve body so that the flow passage is connected with the inside of the battery cell, the first sealing surface and the second sealing surface are in sealing contact.

[0005] The valve assembly described above can push the valve body by the valve core to make the flow passage connected with the inside of the battery cell during the liquid injection or exhausting process, so that the medium can be injected into the inside of the battery cell or discharged to the outside of the battery cell through the flow guide passage and the flow passage. Since the first sealing surface and the second sealing surface are in sealing contact when the flow passage is connected with the inside of the battery cell, the valve core and the valve body are in sealing cooperation, so that the electrolyte cannot be back-seeped from between the valve body and the valve core due to the pressure inside the battery cell when the valve is opened, which effectively reduces the probability of back-seepage of the electrolyte during the liquid injection process, so that the liquid injection operation can be normally performed, and the pollution to the battery cell is reduced.

[0006] In some embodiments, the flow passage comprises a flow cavity and an opening and a valve port respectively connected with the flow cavity, the valve core passes through the opening and is inserted into the flow cavity to make the flow guide passage connected with the flow cavity, the first sealing surface is arranged around an outer periphery of the opening, and the first sealing surface and the second sealing surface are in sealing contact in a case that the valve core is controlled to push the valve body so that the valve port is connected with the inside of the battery cell. In this way, the valve port and the opening are introduced, which not only makes the flow guide passage and the flow passage keep stable connection, but also facilitates the effective control of the connection and disconnection between the flow passage and the inside of the battery cell.

[0007] In some embodiments, the valve core further comprises a third sealing surface arranged around the outer periphery of the flow guide channel and located on the side of the second sealing surface facing the valve body, the third sealing surface at least partially penetrates the opening and sealingly cooperates with the cavity wall of the flow cavity. In this way, the third sealing surface is introduced so that, after the valve core cooperates with the valve body, the third sealing surface cooperates with the cavity wall of the flow cavity, cooperates with the first sealing surface and the second sealing surface, forms a double seal, further improves the sealing performance, and effectively reduces the probability of reverse infiltration of electrolyte during the liquid injection process.

[0008] In some embodiments, the valve assembly further comprises an elastic body, the elastic body is sleeved outside the valve core and is used for elastically abutting against the outer periphery of one end of the through hole. In this way, the elastic body is introduced to provide a sealing structure for the outer periphery of the through hole, further improve the sealing performance between the valve core and the valve body, and effectively reduce the probability of reverse infiltration of electrolyte during the liquid injection process.

[0009] In some embodiments, the valve core comprises a core body and a pressing portion arranged around the outer periphery of the core body, the flow guide channel and the second sealing surface are arranged on the core body, and the elastic body is sleeved outside the core body and abuts against the surface of the pressing portion facing the valve body. In this way, the valve core is designed as the pressing portion and the core body, which not only facilitates the pushing operation of the valve body, but also facilitates the stable abutment of the elastic body between the valve core and the outer periphery of the through hole, thereby achieving effective sealing.

[0010] In some embodiments, the valve core further comprises a limiting protrusion, the limiting protrusion is protruded from the surface of the pressing portion facing the valve body and arranged around the outer periphery of the elastic body, and the limiting protrusion is used for limiting cooperation with the outer periphery of the through hole of the battery monomer in the pushing direction of the valve core. In this way, the limiting protrusion is arranged to limit the downward stroke of the valve core towards the valve body, thereby reducing the possibility that the valve body is completely separated from the outside of the through hole due to excessive pushing of the valve body. At the same time, the limiting protrusion limits the outer periphery of the elastic body, so that the elastic body is stably compressed between the pressing portion and the outer periphery of the through hole.

[0011] In some embodiments, a deformation space is formed between the limiting protrusion and the elastic body. In this way, the deformation space is introduced so that part of the elastic body deforms into the deformation space, thereby making the valve core more easily pressed down, and further making the valve opening operation more convenient.

[0012] In some embodiments, the surface of the pressing portion facing the valve body is provided with a fixing groove, the fixing groove is arranged around the outer periphery of the core body, and one end of the elastic body is clamped into the fixing groove. In this way, the fixing groove is introduced so that the elastic body is stably installed on the pressing portion, thereby reducing the possibility that the structure of the elastic body is unstable due to pressure.

[0013] In some embodiments, the valve core further comprises a blocking portion protruding from the surface of the extrusion portion away from the valve body and surrounding the outer periphery of the flow guide channel. In this way, the blocking portion is introduced to reduce the probability of electrolyte overflowing around the extrusion portion, so that the liquid injection operation is stable.

[0014] In some embodiments, the core body comprises a main body portion and a sealing portion surrounding the outer periphery of the main body portion, the main body portion protrudes the sealing portion towards the valve body, the flow guide channel is arranged in the main body portion, the portion of the main body portion protruding out of the sealing portion is arranged in the overflow channel to communicate the flow guide channel with the overflow channel, and the second sealing surface is arranged on the surface of the sealing portion facing the valve body. In this way, the core body is designed as the main body portion and the sealing portion, which facilitates sealing between the valve core and the valve body when the overflow channel is in communication with the interior of the battery monomer, and reduces the probability of reverse osmosis of electrolyte.

[0015] In some embodiments, the flow guide channel comprises a channel body and a flow guide port and a communication port in communication with the channel body, respectively, the flow guide port is arranged at one end of the main body portion away from the valve body, and the communication port is arranged in the overflow channel. In this way, the electrolyte is injected into the overflow channel through the flow guide channel, so that the liquid injection operation is stable.

[0016] In some embodiments, the main body portion comprises a valve stem, a cover portion and a drainage portion, the cover portion is arranged at one end of the valve stem and forms a channel body with the interior of the valve stem, the flow guide port is arranged at one end of the valve stem away from the cover portion, the communication port is arranged on the side surface of the valve stem, and the drainage portion is arranged on the surface of the cover portion facing the channel body to guide the electrolyte in the channel body to the communication port. In this way, the electrolyte smoothly enters the communication port, so that the liquid injection operation is more stable.

[0017] In some embodiments, the height of the drainage portion protruding towards the channel body gradually decreases from the middle of the drainage portion to the peripheral edge of the drainage portion. In this way, the electrolyte is drained from the middle to the periphery, so that the electrolyte smoothly enters the communication port.

[0018] In some embodiments, the valve body comprises a blocking portion and a fixed portion connected with the blocking portion, the blocking portion and the fixed portion define the overflow channel therebetween, a clamping opening is formed between the surface of the blocking portion and the surface of the fixed portion, the clamping opening is used to clamp into the hole wall of the through hole, and the first sealing surface is arranged on the surface of the fixed portion away from the blocking portion. In this way, when the fixed portion and the sealing portion are both in sealing cooperation with the end cover, the sealing performance between the valve assembly and the through hole is improved, thereby greatly reducing the possibility of medium exchange between the outside and the interior of the battery monomer; at the same time, by arranging the clamping opening, the assembly is convenient and the cooperation is tight, which helps to improve the sealing performance between the valve body and the through hole.

[0019] In a second aspect, the application provides a battery production device, which comprises the valve assembly of any one of the above. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The exploded view of the battery cell in some embodiments of the present application.

[0021] Figure 2 The structure view of the valve assembly assembled on the end cover in some embodiments of the present application.

[0022] Figure 3 The exploded view of the valve assembly assembled on the end cover in some embodiments of the present application.

[0023] Figure 4 The sectional view of the valve assembly assembled on the end cover in some embodiments of the present application.

[0024] Figure 5 The structure view of the valve body in some embodiments of the present application.

[0025] Figure 6 The sectional view of the valve body in some embodiments of the present application.

[0026] Figure 7 The sectional view of the valve core in some embodiments of the present application.

[0027] 100, valve assembly; 10, valve body; 11, flow passage; 111, flow cavity; 112, opening; 113, valve port; 114, fixed part; 115, plugging part; 116, bayonet; 12, first sealing surface; 20, valve core; 21, flow guide passage; 211, flow guide port; 212, passage body; 213, communication port; 22, core body; 221, body part; 21a, valve rod; 21b, cover part; 21c, flow guide part; 222, sealing part; 223, second sealing surface; 224, third sealing surface; 23, extrusion part; 231, fixed groove; 232, limiting convex part; 233, deformation space; 234, blocking part; 30, elastic body; 200, battery cell; 210, end cover; 220, shell; 230, electrode assembly; 240, through hole; 241, first hole section; 242, second hole section; 250, recess; X, pushing direction. DETAILED DESCRIPTION

[0028] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of ways beyond the specific embodiments described and claimed herein. It is therefore intended that the present application not be limited in scope to the specific embodiments disclosed but rather that the scope of the present application be measured by the broadest permissible interpretation of the claims that follow.

[0029] In the description of the application, it should be understood that, if there are these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application.

[0030] In addition, if there are these terms "first", "second", these terms are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the application, if the term "multiple" appears, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0031] In this application, unless otherwise explicitly specified and limited, if there are terms such as "mounting", "connecting", "connecting", "fixing" and the like, these terms should be broadly understood. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0032] In this application, unless otherwise explicitly specified and limited, if there are similar descriptions such as "first feature on or under second feature", the meaning can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" of the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" of the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0033] It is to be noted that if an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or there can be an intervening element. If an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intervening element. The terms "vertical", "horizontal", "upper", "lower", "left", "right", and similar terms as used herein are for the purpose of illustration only and do not indicate the only orientation of the embodiments.

[0034] At present, from the development of market situation, the application of battery is more and more widely. The battery is not only applied to the energy storage power system such as hydroelectric power station, thermal power station, wind power station and solar power station, but also widely applied to electric vehicles such as electric bicycle, electric motorcycle, electric automobile and electric traffic tools, military equipment and aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0035] The battery includes battery monomer, and the battery monomer will pass through the exhaust and liquid injection processes in sequence when it is manufactured. For example, before the battery monomer is transported to the liquid injection station for liquid injection (injection of electrolyte), the battery monomer should be first placed in the exhaust station for exhaust. The exhaust refers to placing the battery monomer in a high-temperature and vacuum environment for baking, so that the moisture of the electrode assembly collected in the internal environment of the battery monomer can be evaporated and discharged to the outside of the battery monomer through the liquid injection hole on the end cover of the battery monomer. After the exhaust is completed, the battery monomer is transported from the exhaust station to the liquid injection station. In order to facilitate the exhaust or liquid injection operation, a switch valve is generally arranged in the liquid injection hole, and by opening the switch valve, the inside and outside of the battery monomer are connected, so that the gas is discharged to the outside of the battery monomer or the electrolyte is injected into the inside of the battery monomer.

[0036] However, during the valve opening process, the inside of the battery monomer has a certain pressure, which will hinder the injection of the electrolyte, causing part of the electrolyte to appear reverse osmosis in the switch valve, not only affecting the normal progress of the liquid injection, but also easily polluting the battery monomer.

[0037] Therefore, in view of the problem of reverse osmosis of electrolyte in the traditional liquid injection process, the valve assembly provided by the present application can apply a pushing force to the valve body by the valve core during the liquid injection or exhaust process, push the valve body, so that the flow passage is in communication with the inside of the battery monomer. At this time, the medium can be injected into the inside of the battery monomer through the flow guide passage and the flow passage, or discharged to the outside of the battery monomer. Since the first sealing surface and the second sealing surface are in sealing contact when the flow passage is in communication with the inside of the battery monomer, the valve core and the valve body are in sealing cooperation, therefore, during the valve opening, the electrolyte will not seep out from between the valve body and the valve core due to the pressure in the battery monomer, effectively reducing the probability of reverse osmosis of electrolyte during the liquid injection process, so that the liquid injection operation can be carried out normally; at the same time, the pollution to the battery monomer is reduced.

[0038] Wherein, the battery cell 200 refers to the smallest unit of a battery. Please refer to Figure 1 , Figure 1 is an exploded structural view of the battery cell 200 in some embodiments of the present application. The battery cell 200 includes an electrode assembly 230, a case 220, and an end cover 210.

[0039] The electrode assembly 230 is a component in which electrochemical reactions occur in the battery cell 200. One or more electrode assemblies 230 can be included in the battery cell 200. The electrode assembly 230 is mainly formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The positive electrode sheet and the negative electrode sheet have portions with active materials that constitute a main body 221 of the electrode assembly 230, and portions without active materials that each constitute a tab. The positive electrode tab and the negative electrode tab can be located together at one end of the main body 221 or at two ends of the main body 221, respectively. During charging and discharging of the battery, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs are connected to the electrode terminal to form a current loop.

[0040] The case 220 is a component for cooperating with the end cover 210 to form an internal environment of the battery cell 200, and the formed internal environment can be used to accommodate the electrode assembly 230, the electrolyte, and other components. The case 220 and the end cover 210 can be independent components, and an opening can be provided on the case 220, and the end cover 210 is used to cover the opening to form the internal environment of the battery cell 200. Without limitation, the end cover 210 and the case 220 can also be integrated, specifically, the end cover 210 and the case 220 can first form a common connecting surface before other components enter the case, and when it is necessary to seal the inside of the case 220, the end cover 210 is used to cover the case 220. The case 220 can be various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the case 220 can be determined according to the specific shape and size of the electrode assembly 230. The material of the case 220 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations on this.

[0041] The end cover 210 refers to a component that covers the opening of the housing 220 to isolate the internal environment of the battery cell 200 from the outside. Without limitation, the shape of the end cover 210 can be adapted to the shape of the housing 220 to fit the housing 220. Optionally, the end cover 210 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cover 210 is less likely to deform when subjected to extrusion collision, so that the battery cell 200 can have higher structural strength, and the safety performance can also be improved. The end cover 210 can be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect with the electrode assembly 230 for outputting or inputting the electrical energy of the battery cell 200. In some embodiments, the end cover 210 can also be provided with a pressure relief mechanism for relieving the internal pressure of the battery cell 200 when the internal pressure or temperature of the battery cell 200 reaches a threshold value. In some embodiments, an insulating member can also be provided on the inner side of the end cover 210, which can be used to isolate the electrical connection components in the housing 220 from the end cover 210 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0042] According to some embodiments of the present application, referring to Figures 2 to 4 , the present application provides a valve assembly 100 for being assembled in the through hole 240 of the battery cell 200, the valve assembly 100 comprising a valve body 10 and a valve core 20. The valve body 10 is used to seal the through hole 240, and the valve body 10 comprises a flow passage 11 and a first sealing surface 12 arranged around the outer periphery of the flow passage 11; the valve core 20 comprises a flow guide passage 21 communicating the outside of the battery cell 200 and the flow passage 11, and a second sealing surface 223 arranged around the outer periphery of the flow guide passage 21. Wherein, when the valve core 20 is controlled to push the valve body 10 to make the flow passage 11 communicate with the inside of the battery cell 200, the first sealing surface 12 and the second sealing surface 223 are in sealing contact.

[0043] The valve body 10 refers to a structure blocked in the through hole 240 of the battery monomer 200 to cut off the communication between the inside of the battery monomer 200 and the outside of the battery monomer 200, and effectively prevent water from entering the inside of the battery monomer 200. The through hole 240 on the battery monomer 200 can be a liquid injection hole on the battery monomer 200, or an explosion-proof hole; of course, it can also be a hole specially opened on the battery monomer 200 for corresponding operation. In some examples, the through hole 240 is a liquid injection hole on the end cover 210 of the battery monomer 200. At the same time, the shape of the through hole 240 also has various designs, such as: the through hole 240 can be designed as a straight hole; or the through hole 240 can also be designed as a multi-segment structure with different diameters. Exemplarily, the through hole 240 can include a first hole segment 241 and a second hole segment 242 in communication with the first hole segment 241, the flow area of the second hole segment 242 is smaller than that of the first hole segment 241, and the second hole segment 242 is arranged closer to the inside of the battery monomer 200, and the valve body 10 is sealingly assembled in the second hole segment 242.

[0044] It can be understood that the valve body 10 is sealingly arranged in the through hole 240, and can block the through hole 240, so that the inside of the battery monomer 200 and the outside of the battery monomer 200 are not communicated, and effective water isolation of the battery monomer 200 is achieved. When the valve core 20 drives the valve body 10 to push towards the inside of the battery monomer 200, part of the valve body 10 is separated from the hole wall of the through hole 240, so that the flow channel 11 is in communication with the inside of the battery monomer 200. In this way, during the liquid injection process, the electrolyte can enter the flow channel 11 from the flow guide channel 21, and then be injected into the inside of the battery monomer 200 from the flow channel 11. Similarly, during the baking and exhaust process, the gas enters the flow channel 11 from the inside of the battery monomer 200, and then enters the flow guide channel 21 from the flow channel 11, and finally is discharged to the outside of the battery monomer 200 from the flow guide channel 21. The fixing method of the valve body 10 in the through hole 240 can be various, such as: the valve body 10 can be clamped on the hole wall of the through hole 240; or the valve body 10 is pressed in the through hole 240 by pressing.

[0045] Since the over-flow passage 11 can be in communication with the interior of the battery cell 200 when the valve core 20 pushes the valve body 10, the two ends of the over-flow passage 11 can be located on the surface of the valve body 10, so that the over-flow passage 11 can be in communication with the interior of the battery cell 200 after the valve body 10 is separated from the hole wall of the through hole 240. The structure of the over-flow passage 11 can be various, for example, the over-flow passage 11 is arranged in the interior of the valve body 10 and the two ends thereof penetrate the surface of the valve body 10; or the over-flow passage 11 is formed by the inward recess of the surface of the valve body 10. Exemplarily, the valve body 10 can be a structure with elastic function, for example, it can be a rubber structure, which can be elastically deformed when a pushing force is applied, so as to be separated from the hole wall of the through hole 240 and make the over-flow passage 11 in communication with the interior of the battery cell 200. When the pushing force is removed, the valve body 10 can be re-sealed in the through hole 240 by the elasticity thereof, so as to effectively prevent water from entering.

[0046] The valve core 20 is a structure which can transmit a pushing force to the valve body 10. When the valve core 20 pushes the valve body 10 to make the over-flow passage 11 in communication with the interior of the battery cell 200, the electrolyte can be guided to the over-flow passage 11 through the flow guide passage 21; or the gas can be discharged out of the battery cell 200 through the flow guide passage 21. Since the flow guide passage 21 needs to be connected with the over-flow passage 11 and the exterior of the battery cell 200, the two ends of the flow guide passage 21 can be located on the surface of the valve body 10, for example, the flow guide passage 21 is arranged in the interior of the valve core 20 and the two ends thereof penetrate the surface of the valve core 20; or the flow guide passage 21 is formed by the inward recess of the surface of the valve core 20.

[0047] When the over-flow passage 11 is arranged in the interior of the valve body 10 and the two ends thereof penetrate the surface of the valve body 10, the valve core 20 can be inserted into the over-flow passage 11, so that the flow guide passage 21 is in communication with the over-flow passage 11; when the over-flow passage 11 is recessed on the surface of the valve body 10, the valve core 20 can be directly abutted on the surface of the valve body 10 and make one end of the flow guide passage 21 in communication with the over-flow passage 11. Meanwhile, the valve core 20 and the valve body 10 can be designed as a separable structure, so that the valve core 20 can be removed after the liquid injection is completed, thereby reducing the space occupation of the valve assembly 100 on the battery cell 200. At this time, the valve body 10 can be retained in the through hole 240 of the battery cell 200, so as to seal the through hole 240 and cut off the communication between the interior and the exterior of the battery cell 200.

[0048] In addition, since the first sealing surface 12 and the second sealing surface 223 correspond to the outer periphery of the flow guide channel 21 and the flow guide channel respectively, when the first sealing surface 12 and the second sealing surface 223 are in contact, a closed structure can be formed on the outer periphery of the flow guide channel 21 and the flow guide channel, so that the electrolyte cannot be exuded from between the valve core 20 and the valve body 10. The first sealing surface 12 and the second sealing surface 223 can both be designed as a flat surface, or both can be designed as a curved surface. When the first sealing surface 12 and the second sealing surface 223 are both curved surfaces, the first sealing surface 12 and the second sealing surface 223 can be in close contact with each other.

[0049] In this way, when the valve is opened, the electrolyte will not be exuded from between the valve body 10 and the valve core 20 due to the pressure inside the battery monomer 200, effectively reducing the probability of reverse exudation of the electrolyte during the liquid injection process, so that the liquid injection operation can be normally carried out; at the same time, the pollution to the battery monomer 200 is reduced.

[0050] According to some embodiments of the present application, optionally, please refer to Figure 5 With Figure 6 The overflow channel 11 includes an overflow cavity 111 and an opening 112 and a valve port 113 respectively communicating with the overflow cavity 111, the valve core 20 passes through the opening 112 and is inserted into the overflow cavity 111, so that the flow guide channel 21 and the overflow cavity 111 are in communication, the first sealing surface 12 is arranged on the outer periphery of the opening 112, and the first sealing surface 12 and the second sealing surface 223 are in sealing contact when the valve core 20 is controlled to push the valve body 10 so that the valve port 113 is in communication with the inside of the battery monomer 200.

[0051] The opening 112 refers to a structure on the valve body 10 that can allow the flow guide channel 21 to communicate with the flow guide channel, when the valve core 20 is inserted into the overflow cavity 111, not only can the valve body 10 be stably pushed by the valve core 20, but also the flow guide channel 21 and the overflow cavity 111 are in communication, so that the medium can flow between the flow guide channel 21 and the overflow cavity 111. The medium can be electrolyte or gas generated by drying in the battery monomer 200.

[0052] The valve port 113 refers to a structure on the valve body 10 that can allow the overflow cavity 111 and the inside of the battery monomer 200 to communicate. When the valve body 10 is sealingly assembled in the through hole 240, the valve port 113 is not in communication with the inside of the battery monomer 200. Illustratively, when the valve body 10 is sealingly assembled in the through hole 240, the valve port 113 is located on the surface of the valve body 10 facing the hole wall of the through hole 240. When the valve body 10 is pushed, part of the valve body 10 is separated from the hole wall of the through hole 240, so that the valve port 113 is exposed to the inside of the battery monomer 200, so that the electrolyte can enter the inside of the battery monomer 200 from the flow guide channel 21, the overflow cavity 111 and the valve port 113.

[0053] The number of valve ports 113 can be one or multiple. When the valve ports 113 are multiple, all the valve ports 113 can be distributed along the circumference of the valve body 10, so that the electrolyte can enter the battery cell 200 uniformly.

[0054] The flow passage 111 can be arranged inside the valve body 10 or on the surface of the valve body 10. Exemplarily, the flow passage 111 can include a first sub-cavity and a second sub-cavity in communication with the first sub-cavity, the length direction of the first sub-cavity intersects the length direction of the second sub-cavity, the first sub-cavity is in communication with the opening 112, and the second sub-cavity is in communication with the valve port 113.

[0055] In this way, the introduction of the valve port 113 and the opening 112 not only ensures the stable communication between the flow channel 21 and the flow passage 111, but also facilitates the effective control of the communication between the flow passage 111 and the inside of the battery cell 200.

[0056] According to some embodiments of the present application, optionally, please refer to Figure 4 The valve core 20 further includes a third sealing surface 224 arranged around the outer periphery of the flow channel 21 and located on the side of the second sealing surface 223 facing the valve body 10, the third sealing surface 224 at least partially penetrates the opening 112 and is in sealing cooperation with the cavity wall of the flow passage 111.

[0057] When the valve core 20 penetrates the opening 112 and is inserted into the flow passage 111, the third sealing surface 224 is at least partially located in the flow passage 111 and is in sealing cooperation with the cavity wall of the flow passage 111. Therefore, when the valve core 20 cooperates with the valve body 10, the first sealing surface 12 cooperates with the second sealing surface 223, and the third sealing surface 224 cooperates with the cavity wall of the flow passage 111, achieving double sealing and improving the sealing effect between the valve core 20 and the valve body 10.

[0058] It can be understood that, since the third sealing surface 224 needs to cooperate with the cavity wall of the flow passage 111, the third sealing surface 224 is closer to the flow channel 21 than the second sealing surface 223, i.e., the second sealing surface 223 is located on the side of the third sealing surface 224 away from the flow channel 21.

[0059] In this way, the introduction of the third sealing surface 224 makes the third sealing surface 224 cooperate with the cavity wall of the flow passage 111 after the valve core 20 cooperates with the valve body 10, and the third sealing surface 224 cooperates with the first sealing surface 12 and the second sealing surface 223, forming double sealing, further improving the sealing performance and effectively reducing the probability of reverse infiltration of the electrolyte during the liquid injection process.

[0060] According to some embodiments of the present application, optionally, please refer to Figure 3 and Figure 4The valve assembly 100 further comprises an elastic body 30, which is sleeved on the outer side of the valve core 20 and is in elastic abutment with the outer periphery of one end of the through hole 240.

[0061] It can be understood that the elastic body 30 is sleeved on the outer side of the valve core 20 and is in abutment with the outer periphery of one end of the through hole 240. It can be seen that when the valve assembly 100 is assembled in the through hole 240, the elastic body 30 provides a supporting force for the valve core 20 by abutting against the outer periphery of the through hole 240, so that the valve core 20 is more stably assembled on the battery monomer 200. At the same time, during the liquid injection or exhaust process, the valve core 20 is always in abutment with the outer periphery of the through hole 240, forming a closed structure between the valve core 20 and the outer periphery of the through hole 240. This cooperates with the first sealing surface 12 and the second sealing surface 223 to form a double sealing.

[0062] In some embodiments, referring to Figure 4 The valve core 20 further comprises a third sealing surface 224, which is annularly arranged on the outer periphery of the flow guide channel 21 and located on the side of the second sealing surface 223 facing the valve body 10, and the third sealing surface 224 at least partially penetrates into the flow channel 11 and is in sealing cooperation with the inner wall of the flow channel 11. It can be seen that during the liquid injection or exhaust process, the first sealing surface 12 cooperates with the second sealing surface 223, the third sealing surface 224 cooperates with the inner wall of the flow channel 11, and the elastic body 30 abuts between the valve core 20 and the outer periphery of the through hole 240, so that the valve core 20 and the valve body 10 have three sealing structures, which greatly improves the sealing effect between the valve core 20 and the valve body 10, and effectively reduces the probability of reverse infiltration of electrolyte.

[0063] It should be noted that the elastic body 30 sleeved on the outer side of the valve core 20 should be understood as: the elastic body 30 has a ring structure, which is sleeved on the outer side of the valve core 20 and maintains a connection relationship with the valve core 20. In this way, when the valve core 20 presses down the valve body 10, the elastic body 30 will not be separated from the valve core 20, but will be elastically deformed with the valve core 20, so that the elastic body 30 is tightly abutted on the outer periphery of the through hole 240, realizing effective sealing. The connection mode can be various, such as clamping, bonding, abutting, etc. between the elastic body 30 and the valve core 20. At the same time, the material of the elastic body 30 can be various, as long as it has a certain elasticity, such as rubber, etc.

[0064] In addition, in order to facilitate the compression of the elastic body 30, the thickness of the part of the elastic body 30 close to the valve body 10 is thinner, that is, the end of the elastic body 30 close to the valve body 10 has a reverse triangular design. In this way, the elastic body 30 can be uniformly compressed after the valve is opened, and the reverse triangular design can reduce the overall volume of the elastic body 30, ensuring that the diameter of the elastic body 30 after compression deformation is as small as possible after the valve is opened.

[0065] In this way, the elastic body 30 is arranged to provide a sealing structure for the outer periphery of the through hole 240, thereby further improving the sealing between the valve core 20 and the valve body 10, and effectively reducing the probability of reverse osmosis of the electrolyte during the liquid injection process.

[0066] According to some embodiments of the present application, optionally, referring to Figure 4 The valve core 20 comprises a core body 22 and an extrusion portion 23 arranged around the outer periphery of the core body 22, the flow guide channel 21 and the second sealing surface 223 are arranged on the core body 22, and the elastic body 30 is sleeved on the outer periphery of the core body 22 and abuts against the surface of the extrusion portion 23 facing the valve body 10.

[0067] It can be seen that the elastic body 30 abuts between the extrusion portion 23 and the outer periphery of the through hole 240, so that the valve core 20 is stably arranged in the through hole 240, thereby improving the stability of the structure. During the liquid injection or exhaust process, the extrusion portion 23 is pressed and pushes the valve body 10 through the core body 22. When the overflow channel 11 is in communication with the inside of the battery monomer 200, the first sealing surface 12 and the second sealing surface 223 are in sealing contact; at the same time, the elastic body 30 abuts between the extrusion portion 23 and the outer periphery of the through hole 240, so that double sealing is achieved during the liquid injection or exhaust process.

[0068] When the overflow channel 11 is in communication with the inside of the battery monomer 200, the electrolyte can flow into the overflow channel 11 through the flow guide channel 21 of the core body 22, and then be injected into the battery monomer 200 through the overflow channel 11, so as to complete the liquid injection operation.

[0069] In this way, the valve core 20 is designed as the extrusion portion 23 and the core body 22, which not only facilitates the pushing operation of the valve body 10, but also facilitates the stable abutment of the elastic body 30 between the valve core 20 and the outer periphery of the through hole 240, thereby achieving effective sealing.

[0070] According to some embodiments of the present application, optionally, referring to Figure 4 The valve core 20 further comprises a limiting protrusion 232, which is protruded from the surface of the extrusion portion 23 facing the valve body 10 and arranged around the outer periphery of the elastic body 30, and the limiting protrusion 232 is used for limiting cooperation with the outer periphery of the through hole 240 of the battery monomer 200 along the pushing direction X of the valve core 20.

[0071] When the valve core 20 pushes down the valve body 10, as the valve body 10 opens the through hole 240, the valve core 20 also approaches the battery monomer 200. At this time, the limiting protrusion 232 can abut against the outer periphery of the through hole 240 of the battery monomer 200, thereby limiting the valve core 20 from being further pushed down, and achieving effective limiting. At the same time, the limiting protrusion 232 is arranged around the outer periphery of the elastic body 30, so that the limiting protrusion 232 plays a limiting role on the outer periphery of the elastic body 30, thereby reducing the structural instability of the elastic body 30 caused by the extrusion of the valve core 20.

[0072] The limiting protrusion 232 is located on the outer periphery of the elastic body 30, which can be attached to the side of the elastic body 30 away from the valve core 20, or can have a certain gap with the elastic body 30, so that the elastic body 30 has a deformable space between the elastic body 30 and the limiting protrusion 232, facilitating the downward pressing of the valve core 20 towards the valve body 10. The connecting mode of the limiting protrusion 232 on the extrusion part 23 can be various, such as but not limited to bolt connection, clamping, riveting, bonding, etc.; or the limiting protrusion 232 and the extrusion part 23 are integrated structure.

[0073] In this way, the limiting protrusion 232 is arranged to limit the downward stroke of the valve core 20 towards the valve body 10, reducing the possibility of the valve body 10 completely separating from the outside of the through hole 240 due to excessive pushing of the valve body 10; at the same time, the limiting protrusion 232 limits the outer periphery of the elastic body 30, so that the elastic body 30 is stably compressed between the extrusion part 23 and the outer periphery of the through hole 240.

[0074] According to some embodiments of the present application, optionally, please refer to Figure 4 The limiting protrusion 232 and the elastic body 30 form a deformation space 233.

[0075] The deformation space 233 refers to the gap space between the limiting protrusion 232 and the elastic body 30. When the valve core 20 pushes the valve body 10 downward, the elastic body 30 is also deformed under pressure. Since the elastic body 30 and the limiting protrusion 232 have a deformation space 233, the elastic body 30 is partially deformed into the deformation space 233, making it easier for the valve core 20 to be pressed downward. In some embodiments, the battery monomer 200 is provided with a groove 250, the groove 250 is located at one end of the through hole 240, and the flow area of the groove 250 is greater than that of the through hole 240. The limiting protrusion 232 is used to abut against the outer periphery of the groove 250, and the elastic body 30 abuts against the bottom wall of the groove 250 located on the outer periphery of the through hole 240, and the deformation space 233 is opposite to the groove 250. In this way, the elastic body 30 can be deformed in the deformation space 233 and the groove 250, making it easier for the valve core 20 to be pressed downward.

[0076] In this way, the deformation space 233 is introduced, so that the elastic body 30 is partially deformed into the deformation space 233, thereby making it easier for the valve core 20 to be pressed downward, and further making the valve opening operation more convenient.

[0077] According to some embodiments of the present application, optionally, please refer to Figure 4 The surface of the extrusion part 23 towards the valve body 10 is provided with a fixing groove 231, the fixing groove 231 is arranged around the outer periphery of the core body 22, and one end of the elastic body 30 is clamped into the fixing groove 231.

[0078] The fixed groove 231 refers to a ring-shaped structure in which the surface of the extrusion portion 23 is inwardly recessed towards the valve body 10, and the one end of the elastic body 30 is clamped into the fixed groove 231, so that the elastic body 30 is stably mounted on the extrusion portion 23.

[0079] In this way, the fixed groove 231 is introduced, so that the elastic body 30 is stably mounted on the extrusion portion 23, and the possibility of structural instability of the elastic body 30 due to pressure is reduced.

[0080] According to some embodiments of the present application, optionally, referring to Figure 4 The valve core 20 further comprises a blocking portion 234, which is protruded on the surface of the extrusion portion 23 away from the valve body 10 and annularly arranged on the outer periphery of the flow guide channel 21.

[0081] The blocking portion 234 refers to a structure arranged circumferentially on the extrusion portion 23, which provides a blocking structure for the periphery of the extrusion portion 23. For example, during the liquid injection process, the liquid injection nozzle abuts against the extrusion portion 23, and the electrolyte enters the flow guide channel 21 on the extrusion portion 23 from the liquid injection nozzle. Since the blocking portion 234 is annularly arranged on the outer periphery of the extrusion portion 23, it can block the electrolyte and reduce the probability of electrolyte overflow to the periphery of the extrusion portion 23.

[0082] The blocking portion 234 can be an integral structure with the extrusion portion 23 and protrude from the surface of the extrusion portion 23 along the axis direction of the valve core 20; of course, the blocking portion 234 can also be combined on the extrusion portion 23 in other ways, such as being fixed on the extrusion portion 23 by bonding, clamping, or the like.

[0083] In this way, the blocking portion 234 is introduced, which reduces the probability of electrolyte overflow to the periphery of the extrusion portion 23, so that the liquid injection operation can be stably performed.

[0084] According to some embodiments of the present application, optionally, referring to Figure 4 and Figure 7 The core body 22 comprises a main body portion 221 and a sealing portion 222 annularly arranged on the outer periphery of the main body portion 221, the main body portion 221 protrudes the sealing portion 222 along the side towards the valve body 10, the flow guide channel 21 is arranged on the main body portion 221, the part of the main body portion 221 protruding out of the sealing portion 222 is arranged through the overflow channel 11, so that the flow guide channel 21 and the overflow channel 11 are in communication, and the second sealing surface 223 is arranged on the surface of the sealing portion 222 towards the valve body 10.

[0085] It can be understood that the sealing portion 222 is sleeved on the outer periphery of the main body portion 221, and the main body portion 221 protrudes the sealing portion 222 along the side of the valve body 10, which indicates that the size of the main body portion 221 along the pushing direction X of the valve core 20 is longer than that of the sealing portion 222, and the end surface of the sealing portion 222 and the side surface of the main body portion 221 form an inverted “L” structure. At this time, the second sealing surface 223 is arranged on the end surface of the sealing portion 222, and when the main body portion 221 pushes the valve body 10 to make the overflow passage 11 communicate with the inside of the battery monomer 200, the second sealing surface 223 on the sealing portion 222 is in sealing contact with the first sealing surface 12 on the valve body 10. Exemplarily, the shapes of the sealing portion 222 and the main body portion 221 can be various, such as: the sealing portion 222 and the main body portion 221 are both cylindrical structures, the diameter of the sealing portion 222 is greater than that of the main body portion 221, and the length of the sealing portion 222 is less than that of the main body portion 221.

[0086] In some embodiments, referring to Figure 4 , the circumferential side of the main body portion 221 protruding out of the sealing portion 222 includes a third sealing surface 224, and when the main body portion 221 is arranged in the overflow passage 11, the third sealing surface 224 is in sealing cooperation with the inner wall of the overflow passage 11, so that double sealing is realized during the opening process.

[0087] In this way, the core main body 22 is designed as the main body portion 221 and the sealing portion 222, which facilitates sealing between the valve core 20 and the valve body 10 when the overflow passage 11 communicates with the inside of the battery monomer 200, and reduces the probability of reverse osmosis of the electrolyte.

[0088] According to some embodiments of the present application, optionally, referring to Figure 7 , the flow guide passage 21 includes a passage main body 212 and a flow guide port 211 and a communication port 213 respectively communicating with the passage main body 212, the flow guide port 211 is arranged at one end of the main body portion 221 away from the valve body 10, and the communication port 213 is arranged in the overflow passage 11.

[0089] It can be understood that during the liquid injection process, when the overflow passage 11 communicates with the inside of the battery monomer 200, the electrolyte can enter the passage main body 212 from the flow guide port 211. Since the communication port 213 is arranged in the overflow passage 11, the electrolyte can flow into the overflow passage 11 from the communication port 213, and then be injected into the inside of the battery monomer 200 through the overflow passage 11, thereby realizing the liquid injection operation. The communication port 213 can be arranged on the end surface of the passage main body 212 away from the flow guide port 211, or on the side surface of the passage main body 212.

[0090] In this way, the electrolyte can be injected into the overflow passage 11 through the flow guide passage 21, so that the liquid injection operation is stably performed.

[0091] According to some embodiments of the present application, optionally, referring toFigure 7 The main body 221 includes a valve stem 21a, a cover portion 21b, and a flow guide portion 21c. The cover portion 21b is arranged at one end of the valve stem 21a and forms a channel main body 212 with the inside of the valve stem 21a. A flow guide opening 211 is arranged at the end of the valve stem 21a away from the cover portion 21b. A communication opening 213 is arranged on the side surface of the valve stem 21a. The flow guide portion 21c is arranged on the surface of the cover portion 21b facing the channel main body 212, and is used to guide the electrolyte in the channel main body 212 to the communication opening 213.

[0092] The valve stem 21a refers to a structure that transmits a pushing force to the valve body 10. The valve stem 21a has a certain strength, for example, the material of the valve stem 21a can be but is not limited to plastic, metal, wood, etc. At the same time, the shape of the valve stem 21a can also be various, such as cylindrical, quadrangular prism, pentagonal prism, etc. The cover portion 21b refers to a structure that is closed at one end of the valve stem 21a, which means that the valve stem 21a is a structure that is closed at one end and open at the other end.

[0093] The flow guide portion 21c refers to a structure that can guide the electrolyte to flow into the communication opening 213. Since the communication opening 213 is arranged on the side surface of the channel main body 212, the electrolyte entering the channel main body 212 will flow towards the cover portion 21b. Before reaching the cover portion 21b, the electrolyte will change the flow direction under the action of the flow guide portion 21c, so that the electrolyte enters the communication opening 213 more smoothly. The structure of the flow guide portion 21c can be various, such as an inclined surface structure, an arc curved surface structure, a conical structure, etc.

[0094] The number of communication openings 213 can be one or multiple. When the number of communication openings 213 is multiple, at least part of the communication openings 213 can be distributed around the circumference of the channel main body 212.

[0095] In this way, the electrolyte enters the communication opening 213 smoothly, so that the liquid injection operation is more stable; at the same time, the residual electrolyte can also be reduced.

[0096] According to some embodiments of the present application, optionally, please refer to Figure 7 The height of the flow guide portion 21c protruding in the direction of the side of the channel main body 212 gradually decreases from the middle of the flow guide portion 21c to the circumferential edge of the flow guide portion 21c.

[0097] It can be seen that the flow guide portion 21c presents a conical or similar conical structure. When the electrolyte flows onto the flow guide portion 21c, it will flow along the surface of the flow guide portion 21c to the circumferential edge of the flow guide portion 21c, so that the electrolyte smoothly enters the communication opening 213. In some embodiments, the number of communication openings 213 is multiple, and all the communication openings 213 are distributed around the circumference of the flow guide portion 21c.

[0098] In this way, the electrolyte is guided from the middle to the periphery, so that the electrolyte smoothly enters the communication opening 213.

[0099] According to some embodiments of the present application, referring to Figure 5 The valve body 10 comprises a blocking part 115 and a fixed part 114 connected with the blocking part 115, a flow passage 11 is formed between the blocking part 115 and the fixed part 114, and a bayonet 116 is formed between the surface of the blocking part 115 and the surface of the fixed part 114, the bayonet 116 is used to be clamped into the hole wall of the through hole 240, and the first sealing surface 12 is arranged on the surface of the fixed part 114 away from the blocking part 115.

[0100] The fixed part 114 cooperates with the blocking part 115 to fix the valve body 10 in the through hole 240, wherein the fixed part 114 is relatively close to the outside of the battery monomer 200, and the blocking part 115 is relatively close to the inside of the battery monomer 200. During the liquid injection or exhaust process, the blocking part 115 is pushed by the valve core 20, and a gap is generated between the blocking part 115 and the through hole 240, so that the flow passage 11 is in communication with the inside of the battery monomer 200. However, the position of the fixed part 114 relative to the through hole 240 is unchanged, so that the valve body 10 cannot be completely pushed out of the through hole 240 by the valve core 20.

[0101] In some embodiments, the blocking part 115 and the fixed part 114 are both elastic structures and are integrally arranged. In this way, the blocking part 115 and the fixed part 114 are both designed as elastic components and are integrally arranged, which is beneficial to simplify the structure of the valve body 10 and greatly reduce the manufacturing cost of the valve assembly 100.

[0102] The bayonet 116 refers to a structure that can realize the clamping between the hole wall of the through hole 240 and the valve body 10, and has two oppositely arranged inner walls, which respectively abut the upper and lower ends of the through hole 240 after the hole wall of the through hole 240 is clamped into the bayonet 116.

[0103] In this way, when the fixed part 114 and the sealing section are both in sealing cooperation with the end cover 210, the sealing performance between the valve assembly 100 and the through hole 240 is improved, thereby greatly reducing the possibility of medium exchange between the outside and the inside of the battery monomer 200; at the same time, by arranging the bayonet 116, the assembly is convenient and the cooperation is tight, which is helpful to improve the sealing performance between the valve body 10 and the through hole 240.

[0104] According to some embodiments of the present application, the present application provides a battery production device, which comprises the valve assembly 100 of any one of the above.

[0105] According to some embodiments of the present application, referring to Figures 1 to 7The application provides a valve assembly 100, which comprises a valve core 20, a valve body 10 and an elastic body 30, the valve body 10 is sealedly assembled in a through hole 240 of a battery monomer 200, the valve body 10 is provided with an overflow channel 11 and a first sealing surface 12, the valve core 20 is provided with a flow guide channel 21, a second sealing surface 223 and a third sealing surface 224, one end of the valve core 20 is arranged in the overflow channel 11, the third sealing surface 224 is sealingly matched with the inner wall of the overflow channel 11, the elastic body 30 is sleeved on the outside of the valve core 20 and abuts against the outer periphery of the through hole 240. In the case that the valve core 20 is controlled to push the valve body 10 so that the overflow channel 11 is communicated with the inside of the battery monomer 200, the first sealing surface 12 is sealingly contacted with the second sealing surface 223. In this way, triple sealing is realized, the probability of reverse seepage of electrolyte in the liquid injection process is greatly reduced, the liquid injection operation can be normally carried out, and the pollution to the battery monomer 200 is reduced.

[0106] The technical features of the above-described embodiments can be combined in any manner. To make the description concise, all possible combinations of the technical features in the above-described embodiments are not described, however, as long as the combinations of the technical features do not exist in contradiction, they should be considered as the scope of the present application.

[0107] The above-described embodiments only express several implementation manners of the application, the description is relatively specific and detailed, however, it should not be understood as the limitation of the patent application scope. It should be pointed out that, for the ordinary skilled in the art, several modifications and improvements can be made without departing from the concept of the application, and these all belong to the protection scope of the application. Therefore, the patent protection scope of the application should be subject to the appended claims.

Claims

1. A valve assembly for fitting in a through-hole (240) of a battery cell (200), characterized in that, The valve assembly comprises: a valve body (10) for sealingly fitting in the through hole (240), and the valve body (10) comprises a flow passage (11) and a first sealing surface (12) annularly arranged outside the flow passage (11); a valve core (20) comprising a flow guide passage (21) communicating the outside of the battery monomer (200) and the flow passage (11), and a second sealing surface (223) annularly arranged outside the flow guide passage (21); wherein, in the case that the valve core (20) is controlled to push the valve body (10) so that the flow passage (11) is in communication with the inside of the battery monomer (200), the first sealing surface (12) and the second sealing surface (223) are in sealing contact.

2. The valve assembly of claim 1, wherein, The flow passage (11) comprises a flow cavity (111) and an opening (112) and a valve port (113) respectively in communication with the flow cavity (111), the valve core (20) passes through the opening (112) and is inserted into the flow cavity (111) so that the flow guide passage (21) is in communication with the flow cavity (111), the first sealing surface (12) is annularly arranged outside the opening (112), and in the case that the valve core (20) is controlled to push the valve body (10) so that the valve port (113) is in communication with the inside of the battery monomer (200), the first sealing surface (12) and the second sealing surface (223) are in sealing contact.

3. The valve assembly of claim 2, wherein, The valve core (20) further comprises a third sealing surface (224) annularly arranged outside the flow guide passage (21) and located on the side of the second sealing surface (223) facing the valve body (10), and the third sealing surface (224) at least partially passes through the opening (112) and sealingly cooperates with the cavity wall of the flow cavity (111).

4. The valve assembly of claim 1, wherein, The valve assembly further comprises an elastic body (30) sleeved outside the valve core (20) and used for elastically abutting against the outer periphery of one end of the through hole (240).

5. The valve assembly of claim 4, wherein, The valve core (20) comprises a core body (22) and a pressing portion (23) annularly arranged outside the core body (22), the flow guide passage (21) and the second sealing surface (223) are both arranged on the core body (22), and the elastic body (30) is sleeved outside the core body (22) and abuts against the surface of the pressing portion (23) facing the valve body (10).

6. The valve assembly of claim 5, wherein, The valve core (20) further comprises a limiting protrusion (232) protruding from the surface of the pressing portion (23) facing the valve body (10) and annularly arranged outside the outer periphery of the elastic body (30), and the limiting protrusion (232) is used for limiting cooperation with the outer periphery of the through hole (240) of the battery monomer (200) in the pushing direction (X) of the valve core (20).

7. The valve assembly of claim 6, wherein, A deformation space (233) is formed between the limiting protrusion (232) and the elastic body (30).

8. The valve assembly of claim 5, wherein, The extrusion part (23) is provided with a fixed groove (231) on the surface thereof facing the valve body (10), the fixed groove (231) is annularly arranged on the outer periphery of the core body (22), and one end of the elastic body (30) is clamped into the fixed groove (231).

9. The valve assembly of claim 5, wherein, The valve core (20) further comprises a blocking part (234), the blocking part (234) is protruded on the surface of the extrusion part (23) away from the valve body (10) and annularly arranged on the outer periphery of the flow guide channel (21).

10. The valve assembly of claim 5, wherein, The core body (22) comprises a main body part (221) and a sealing part (222) annularly arranged on the outer periphery of the main body part (221), the main body part (221) protrudes the sealing part (222) on the side thereof facing the valve body (10), the flow guide channel (21) is arranged on the main body part (221), the part of the main body part (221) protruding the sealing part (222) is arranged in the flow passage (11), so that the flow guide channel (21) is in communication with the flow passage (11), and the second sealing surface (223) is arranged on the surface of the sealing part (222) facing the valve body (10).

11. The valve assembly of claim 10, wherein, The flow guide channel (21) comprises a channel main body (212) and a flow guide port (211) and a communication port (213) in communication with the channel main body (212) respectively, the flow guide port (211) is arranged on the end of the main body part (221) away from the valve body (10), and the communication port (213) is arranged in the flow passage (11).

12. The valve assembly of claim 11, wherein, The main body part (221) comprises a valve stem (21a), a cover part (21b) and a drainage part (21c), the cover part (21b) is arranged on the end of the valve stem (21a) and forms the channel main body (212) with the inside of the valve stem (21a), the flow guide port (211) is arranged on the end of the valve stem (21a) away from the cover part (21b), the communication port (213) is arranged on the side surface of the valve stem (21a), and the drainage part (21c) is arranged on the surface of the cover part (21b) facing the channel main body (212) and used for draining the electrolyte in the channel main body (212) to the communication port (213).

13. The valve assembly of claim 12, wherein, The height of the drainage part (21c) protruding on the side direction facing the channel main body (212) gradually decreases from the middle part of the drainage part (21c) to the circumferential edge of the drainage part (21c).

14. The valve assembly of any one of claims 1-13, wherein, The valve body (10) comprises a blocking part (115) and a fixed part (114) connected with the blocking part (115), the blocking part (115) and the fixed part (114) define the flow passage (11) therebetween, a bayonet (116) is formed between the surface of the blocking part (115) and the surface of the fixed part (114), the bayonet (116) is used for clamping into the hole wall of the through hole (240), and the first sealing surface (12) is arranged on the surface of the fixed part (114) away from the blocking part (115).

15. A battery production apparatus characterized by comprising: The battery production device comprises the valve assembly according to any one of claims 1-14.

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