Liquid injection valve, end cover assembly and battery monomer

Abstract

The utility model relates to a liquid injection valve, an end cover assembly and a battery monomer. The liquid injection valve comprises a valve core and a valve cover. A liquid conveying channel is formed in the valve element in a penetrating mode. A liquid injection channel is formed in the valve cover in a penetrating manner; one of the valve cover and the valve core is movably arranged relative to the other one along a first direction, so that the liquid injection valve has a valve opening state in which the liquid injection channel is communicated with the liquid conveying inlet and a valve closing state in which at least part of the valve core blocks the liquid injection channel; the infusion channel is provided with an infusion inlet, and the opening direction of the infusion inlet intersects with the first direction. When the liquid injection valve is in the valve opening state, after the liquid to be injected flows out of the liquid injection channel, the valve element can buffer the liquid to be injected flowing out of the liquid injection channel, so that the flowing direction is changed, then the liquid flows into the liquid injection channel through the liquid injection inlet, the sealing effect between the valve element and the valve cover can be improved, and the structure of the liquid injection valve is simplified.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a liquid injection valve, an end cover assembly and a battery cell. Background Art

[0002] In the field of power batteries, electrolyte is a vital component of the battery. It provides a transmission channel for ion exchange between the positive and negative electrodes and is one of the indispensable materials for the battery to achieve charging and discharging. In the battery production process, there is generally a battery injection process after the bare battery cell is put into the shell. After the electrolyte is injected, a valve is usually used to seal the injection hole. Poor sealing effect of the valve may cause electrolyte leakage. Utility Model Content

[0003] In view of the above problems, the present application provides a liquid injection valve, an end cover assembly and a battery cell, which can alleviate the problem of poor sealing effect of the sealing valve leading to electrolyte leakage.

[0004] In a first aspect, the present application provides a liquid injection valve, which includes a valve core and a valve cover. A liquid infusion channel is provided through the valve core; a liquid injection channel is provided through the valve cover; the valve cover and the valve core are movably arranged relative to the other along a first direction, so that the liquid injection valve has an open valve state in which the liquid injection channel is connected to the liquid infusion inlet, and a closed valve state in which at least part of the valve core blocks the liquid injection channel; wherein the liquid infusion channel has an liquid infusion inlet, and the opening direction of the liquid inlet intersects with the first direction.

[0005] In the technical solution of the embodiment of the present application, when the injection valve is in an open state, after the liquid to be injected flows out of the injection channel, the valve core can buffer the liquid to be injected flowing out of the injection channel to change the flow direction and then flow into the infusion channel through the infusion inlet, which can improve the sealing effect between the valve core and the valve cover and simplify the structure of the injection valve.

[0006] In some embodiments, the valve core has a sealing end, a connecting end and a side wall. The sealing end and the connecting end are arranged opposite to each other along a first direction. The side wall is connected between the sealing end and the connecting end. The sealing end is blocked in the injection channel when the valve is in a closed state, and the infusion inlet is opened on the side wall of the valve core.

[0007] Such an arrangement simplifies the structure of the valve core, reduces the difficulty of switching the injection valve between different states, and facilitates the adjustment of the injection valve.

[0008] In some embodiments, the infusion channel further has an infusion outlet disposed opposite to the infusion inlet and connected to each other, and the infusion outlet is opened on the connecting end along the first direction.

[0009] With such a setting, the structure of the valve core is simplified, and the difficulty of switching the liquid injection valve between different states is reduced. Moreover, by limiting the opening direction of the liquid infusion outlet, the flow direction of the liquid to be injected in the liquid injection valve can be changed to adjust the flow rate of the liquid to be injected.

[0010] In some embodiments, the sealing end and the liquid injection channel are in interference fit, and the size of the valve core gradually increases in the direction from the sealing end to the connecting end.

[0011] The above setting simplifies the structure of the valve core and facilitates the realization of the interference fit between the valve core and the liquid injection channel.

[0012] In some embodiments, the valve cover has a first end and a second end oppositely arranged in a first direction, the first end faces the valve core, and the second end faces away from the valve core; wherein, the end face of the second end is inclined downward along the liquid injection channel.

[0013] When the valve cover is installed in the installation groove of the end cover such as, the external shape of the valve cover can guide the valve cover during the movement of the valve cover, and in addition, the structure of the valve cover is simplified.

[0014] In some embodiments, in the direction intersecting the first direction, the diameter of the valve cover gradually increases from the first end to the second end.

[0015] In this way, on the basis of realizing the interference fit between the valve cover and the valve core, the volume of the valve cover is reduced, thereby reducing the materials required for manufacturing the valve cover.

[0016] In some embodiments, an operation part is provided on the side of the valve cover facing away from the valve core, and the operation part is used to connect with an external device and pull the valve cover to switch from the closed valve state to the open valve state under an external force.

[0017] In this way, by providing an operation part on the valve cover, the relative movement of the valve cover relative to the valve core is realized, which is convenient for the user to operate and reduces the difficulty of driving the valve cover to move relative to the valve core.

[0018] In a second aspect, the present application provides an end cover assembly, which includes an end cover and the liquid injection valve in the above embodiments. The end cover includes a first surface, an opening side of an installation groove is formed on the first surface, and a through hole is formed through the bottom wall of the installation groove; the liquid injection valve is located in the installation groove.

[0019] In this way, when the liquid injection valve is in the open valve state, after the liquid to be injected flows out of the liquid injection channel, the valve core can buffer the liquid to be injected flowing out of the liquid injection channel to change the flow direction and then flow into the liquid infusion channel through the liquid infusion inlet, which can improve the sealing effect between the valve core and the valve cover.

[0020] In some embodiments, when the liquid injection valve is in the open valve state, the end face of the valve cover facing away from the valve core is lower than or flush with the first surface, and the liquid injection channel communicates with the through hole; when the liquid injection valve is in the closed valve state, the end face is lower than the first surface.

[0021] During the liquid injection stage, the probability that the liquid to be injected flows to the first surface of the end cover and corrodes the first surface is reduced, protecting the end cover.

[0022] In some embodiments, the installation groove is recessed along a first direction, the valve core and the valve cover are arranged along the first direction, the liquid injection valve further includes an elastic member, one end of the elastic member is connected to the valve cover, and the other end is connected to the installation groove. The elastic member is used to provide an elastic force for assisting the liquid injection valve to switch between the open valve state and the closed valve state along the first direction.

[0023] After the liquid injection valve is installed in the installation groove, since the valve cover and the bottom wall of the installation groove are connected by the elastic member, the connection stability between the valve cover and the installation groove can be improved, thereby improving the stability of the liquid injection valve installed in the installation groove. In addition, when the liquid injection valve opens and closes the valve, the elastic member will be subjected to an external force and deform. Therefore, the automatic return ability of the valve cover can be improved and the alignment accuracy between the valve core and the valve cover can be improved.

[0024] In some embodiments, the valve core is arranged on the bottom wall of the installation groove, the liquid infusion channel includes a first section and at least two second sections. One end of the first section communicates with the through hole, and the other end communicates with all the second sections. All the second sections are spaced apart around the axis of the valve core, and liquid infusion inlets are provided at the ends of all the second sections away from the first section.

[0025] In this way, the liquid to be injected flowing out of the liquid injection channel can flow into the liquid infusion channel from different liquid infusion inlets, which can accelerate the efficiency of the liquid to be injected flowing into the liquid infusion channel.

[0026] In some embodiments, a limiting portion is provided on the inner wall of the installation groove. When in the closed valve state, the limiting portion abuts against the valve cover.

[0027] After the valve cover abuts against the limiting portion, the valve cover cannot move further. At this time, the sealing end plugs the liquid injection channel, and the channel between the liquid injection channel and the liquid infusion channel is blocked, which can reduce the phenomenon that the liquid infusion channel is reconnected to the liquid injection channel due to excessive movement of the valve cover.

[0028] In a third aspect, the present application provides a battery cell, which includes a housing, an electrode assembly and the end cover assembly in the above embodiments. The electrode assembly is arranged in the housing, and the end cover assembly covers the housing.

[0029] When the liquid injection valve is in the closed valve state, since the valve cover is lower than the first surface, the valve cover and the installation groove together form a receiving space, and the liquid to be injected remaining on the surface of the valve cover is located in this receiving space and will not flow to the first surface. That is, during the liquid injection stage, the probability that the liquid to be injected flows to the first surface of the end cover and corrodes the first surface is reduced, protecting the end cover.

[0030] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the specification. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically described below. Brief Description of the Drawings

[0031] By reading the detailed description of the preferred embodiments below, various other advantages and benefits will become clear to those of ordinary skill in the art. The drawings are only for the purpose of showing the preferred embodiments and are not considered to be a limitation of the present application. Moreover, in all the drawings, the same reference numerals are used to represent the same components. In the drawings:

[0032] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments.

[0033] Figure 2 is an exploded view of a battery according to one or more embodiments.

[0034] Figure 3 is a schematic exploded structural diagram of a battery cell according to one or more embodiments.

[0035] Figure 4 is a schematic structural diagram of a liquid injection valve in the closed valve state according to one or more embodiments.

[0036] Figure 5 is a schematic structural diagram of a liquid injection valve in the open valve state according to one or more embodiments.

[0037] Figure 6 is a schematic structural diagram of an end cover assembly according to one or more embodiments.

[0038] Figure 7 is a cross-sectional view of an end cover assembly according to one or more embodiments.

[0039] Figure 8 is Figure 7 an enlarged view of part A in

[0040] The reference numerals in the specific embodiments are as follows:

[0041] 1000, vehicle;

[0042] 100. Battery; 200. Controller; 300. Motor;

[0043] 10. Box body; 11. First part; 12. Second part;

[0044] 20. Battery cell; 21. End cap assembly; 211. Electrode terminal; 212. End cap; 2121. Mounting groove; 21211. Through hole; 2122. First surface; 22. Housing; 23. Electrode assembly;

[0045] 30. Liquid injection valve; 31. Valve core; 311. Liquid infusion channel; 3111. Liquid infusion inlet; 3112. Liquid infusion outlet; 3113. First section; 3114. Second section; 312. Sealing end; 313. Connection end; 32. Valve cover; 321. Liquid injection channel; 322. First groove; 323. Operation part; 33. Elastic member; X. First direction; Y. Second direction. Detailed implementation manners

[0046] The embodiments of the technical solutions of the present application will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion.

[0048] In the description of the embodiments of the present application, if technical terms such as "first" and "second" appear, they are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means more than two unless otherwise specifically defined.

[0049] Referring to "embodiments" herein means that the specific features, structures or characteristics described in connection with the embodiments may be included in at least one embodiment of this application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0050] In the description of the embodiments of the present application, if the term "and / or" appears, it is merely an association relationship describing associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, if it appears, the character " / " in this text generally represents an "or" relationship between the associated objects before and after.

[0051] In the description of the embodiments of the present application, if it appears, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0052] In the description of the embodiments of the present application, if it appears, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the embodiments of the present application.

[0053] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, if it appears, technical terms such as "installation", "connection", "coupling", "fixation", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0054] During the process of manufacturing a battery, a battery cell usually has a liquid injection hole opened on the top cover of the housing, and a pole column and an explosion-proof valve are provided on the top cover. The outer end of the liquid injection hole is flush with the outer surface of the top cover, and the inner end of the liquid injection hole is flush with the inner surface of the top cover. After completing the electrical connection between the pole ear and the pole column, electrolyte is injected into the housing through the liquid injection hole, and the liquid injection valve is closed to prevent the electrolyte from overflowing from the liquid injection hole. During liquid injection, if the sealing effect of the liquid injection valve is not good, it may cause the electrolyte to overflow from the liquid injection hole, and the overflowing electrolyte is also likely to contaminate and corrode the top cover, as well as the pole column and explosion-proof valve on the top cover, affecting the reliability of the battery cell.

[0055] To improve the problem of poor sealing effect of the liquid injection valve, the liquid injection valve provided in this application intersects the opening direction of the liquid injection channel and the opening direction of the liquid infusion inlet to change the flow direction of the electrolyte in the liquid injection valve, thereby improving the sealing effect of the liquid injection valve.

[0056] The battery cell disclosed in the embodiments of this application can be used in, but is not limited to, electrical devices such as vehicles, ships, or aircraft. A power supply system of the electrical device can be composed of the battery cell, battery, etc. disclosed in this application.

[0057] The embodiments of this application provide an electrical device using a battery as a power source. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0058] For the convenience of description in the following embodiments, an electrical device of an embodiment of this application is taken as an example of a vehicle 1000 for description.

[0059] Please refer to Figure 1 , Figure 1 FIG. is a schematic structural diagram of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, etc. A battery 100 is disposed inside the vehicle 1000. The battery 100 can be disposed at the bottom, head, or tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000. For example, the battery 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1000.

[0060] In some embodiments of this application, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also as a driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0061] Please refer to Figure 2 , Figure 2Exploded view of the battery 100 provided by some embodiments of the present application. The battery 100 includes a box body 10 and battery cells 20, and the battery cells 20 are accommodated in the box body 10. Among them, the box body 10 is used to provide an accommodation space for the battery cells 20, and the box body 10 can adopt various structures. In some embodiments, the box body 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define an accommodation space for accommodating the battery cells 20. The second part 12 may be a hollow structure with one end open, and the first part 11 may be a plate-like structure. The first part 11 covers the open side of the second part 12 so that the first part 11 and the second part 12 jointly define an accommodation space; the first part 11 and the second part 12 may also both be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box body 10 formed by the first part 11 and the second part 12 can be various shapes, such as a cylinder, a cuboid, etc.

[0062] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that there are both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 can be directly connected in series, in parallel, or in a hybrid connection together, and then the whole formed by the multiple battery cells 20 is accommodated in the box body 10; of course, the battery 100 can also be that multiple battery cells 20 are first connected in series, in parallel, or in a hybrid connection to form a battery module form, and then multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a whole and are accommodated in the box body 10. The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component for realizing the electrical connection among the multiple battery cells 20.

[0063] Among them, each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0064] Please refer to Figure 3 , Figure 3 Schematic exploded view of the battery cell 20 provided by some embodiments of the present application. The battery cell 20 refers to the smallest unit that makes up the battery. As Figure 3 shown, the battery cell 20 includes an end cap assembly 21, a housing 22, an electrode assembly 23, and other functional components.

[0065] The end cap assembly 21 refers to a component that covers the opening of the housing 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap assembly 21 can be adapted to the shape of the housing 22 to cooperate with the housing 22. Optionally, the end cap assembly 21 can be made of a material with a certain hardness and strength (such as aluminum alloy). In this way, when the end cap assembly 21 is subjected to extrusion and collision, it is not easily deformed, enabling the battery cell 20 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 211 can be provided on the end cap assembly 21. The electrode terminals 211 can be used for electrical connection with the electrode assembly 23 to output or input the electrical energy of the battery cell 20. In some embodiments, a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold can also be provided on the end cap assembly 21. The material of the end cap assembly 21 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special restrictions on this. In some embodiments, an insulating member can also be provided on the inner side of the end cap assembly 21, and the insulating member can be used to isolate the electrical connection components in the housing 22 from the end cap assembly 21 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0066] The housing 22 is a component used to cooperate with the end cap assembly 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte, and other components. The housing 22 and the end cap assembly 21 can be independent components. An opening can be provided on the housing 22, and the end cap assembly 21 is covered at the opening to form the internal environment of the battery cell 20. Without limitation, the end cap assembly 21 and the housing 22 can also be integrated. Specifically, the end cap assembly 21 and the housing 22 can first form a common connection surface before other components are inserted into the housing, and when it is necessary to encapsulate the inside of the housing 22, the end cap assembly 21 is then covered on the housing 22. The housing 22 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the housing 22 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 restrictions on this.

[0067] The electrode assembly 23 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 23 may be contained within the housing 22. The electrode assembly 23 is mainly formed by winding or laminating 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 portions of the positive electrode sheet and the negative electrode sheet having active materials constitute the main body of the electrode assembly, and the portions of the positive electrode sheet and the negative electrode sheet without active materials respectively constitute the electrode tabs. The positive electrode tab and the negative electrode tab may be located together at one end of the main body or separately at both ends of the main body. During the charge and discharge process of the battery, the positive active material and the negative active material react with the electrolyte, and the electrode tabs are connected to the electrode terminals to form a current loop.

[0068] Please refer to Figure 4 and Figure 5 In some embodiments of the present application, a liquid injection valve 30 is provided, which includes a valve core 31 and a valve cover 32. A liquid infusion channel 311 is formed through the valve core 31; a liquid injection channel 321 is formed through the valve cover 32; one of the valve cover 32 and the valve core 31 is movably disposed relative to the other along the first direction X, so that the liquid injection valve 30 has an open valve state in which the liquid injection channel 321 communicates with the liquid infusion inlet 3111, and a closed valve state in which at least a part of the valve core 31 blocks the liquid injection channel 321; wherein, the liquid infusion channel 311 has a liquid infusion inlet 3111, and the opening direction of the liquid infusion inlet 3111 intersects with the first direction X.

[0069] Exemplarily, the valve cover 32 and the valve core 31 may be distributed along the first direction X, and the liquid injection channel 321 formed on the valve cover 32 may extend along the first direction X. The valve core 31 is provided with a liquid infusion channel 311, and the liquid infusion inlet 3111 of the liquid infusion channel 311 may open along the second direction Y, and the first direction X is perpendicular to the second direction Y.

[0070] The working principle of the liquid injection valve 30 will be described below in combination with the switching of the liquid injection valve 30 between the closed valve state and the open valve state.

[0071] As Figure 4 shown, a part of the valve core 31 is inserted into the liquid injection channel 321. At this time, the liquid injection valve 30 is in the closed valve state. Taking the valve core 31 being always in a static state and the valve cover 32 being movable relative to the valve core 31 as an example. Pull the valve cover 32 in a direction away from the valve core 31 until the valve core 31 leaves the liquid injection channel 321, and there is a gap between the valve core 31 and the valve cover 32. In this way, the liquid injection channel 321 of the valve cover 32 and the liquid infusion channel 311 of the valve core 31 can communicate. As Figure 5 shown, at this time, the liquid injection valve 30 switches from the closed valve state to the open valve state.

[0072] Inject a liquid to be injected, such as electrolyte, into the liquid injection valve 30. Since the opening direction of the liquid infusion inlet 3111 is perpendicular to the extending direction of the liquid injection channel 321, the liquid to be injected will be blocked by the valve core 31 when flowing out of the liquid injection channel 321, thereby changing the flow direction, then entering the liquid infusion channel 311 through the liquid infusion inlet 3111, and finally flowing into the area to be liquid-injected.

[0073] When liquid injection is not required, push the valve cover 32 in the reverse direction of the first direction X until the valve core 31 is inserted into the liquid injection channel 321 and blocks the liquid injection channel 321. At this time, the liquid injection channel 321 is no longer connected to the liquid infusion channel 311. In this way, the liquid injection valve 30 is switched from the open valve state to the closed valve state.

[0074] In summary, when the liquid injection valve 30 is in the open valve state, after the liquid to be injected flows out of the liquid injection channel 321, the valve core 31 can buffer the liquid to be injected flowing out of the liquid injection channel 321 to change the flow direction and then flow into the liquid infusion channel 311 through the liquid infusion inlet 3111, which can improve the sealing effect between the valve core 31 and the valve cover 32 and simplify the structure of the liquid injection valve 30.

[0075] As Figure 5 shown, in some embodiments, the valve core 31 has a sealing end 312, a connecting end 313 and a side wall. The sealing end 312 and the connecting end 313 are oppositely arranged along the first direction X, the side wall is connected between the sealing end 312 and the connecting end 313, the sealing end 312 blocks the liquid injection channel 321 in the closed valve state, and the liquid infusion inlet 3111 is opened on the side wall of the valve core 31.

[0076] Exemplarily, the sealing end 312, the connecting end 313 and the side wall can be prepared by an integral molding process. When the liquid injection valve 30 is in the closed valve state, the sealing end 312 can be inserted into the liquid injection channel 321 and block the liquid injection channel 321. At this time, the path between the liquid injection channel 321 and the liquid infusion inlet 3111 is blocked, and the liquid to be injected cannot enter the liquid injection channel 321 and then enter the liquid injection inlet.

[0077] When the liquid injection valve 30 is switched from the closed valve state to the open valve state, the valve cover 32 moves relative to the valve core 31, the sealing end 312 no longer blocks the liquid injection channel 321, and the liquid to be injected can enter the liquid injection inlet through the liquid injection channel 321.

[0078] With such a setting, the structure of the valve core 31 is simplified, the difficulty of switching the liquid injection valve 30 between different states is reduced, and it is convenient to adjust the liquid injection valve 30.

[0079] Further, please continue to refer to Figure 5, in some embodiments, the valve core 31 further has an infusion outlet 3112 which is oppositely arranged and communicated with the infusion inlet 3111, and the infusion outlet 3112 is opened on the connecting end 313 along the first direction X.

[0080] In other words, along the first direction X, the infusion outlet 3112 is opened on the side of the connecting end 313 away from the sealing end 312, and the opening direction of the infusion outlet 3112 intersects with the opening direction of the infusion inlet 3111.

[0081] When the liquid injection valve 30 is in the open valve state, after the liquid to be injected flows through the liquid injection channel 321, its flow direction will change under the block of the sealing end 312, then enter the infusion inlet 3111, and then change the flow direction again and flow out from the infusion outlet 3112.

[0082] With such a setting, the structure of the valve core 31 is simplified, and the difficulty of switching the liquid injection valve 30 between different states is reduced. Moreover, by limiting the opening direction of the infusion outlet 3112, the flow direction of the liquid to be injected in the liquid injection valve 30 can be changed to adjust the flow rate of the liquid to be injected.

[0083] In some embodiments, the sealing end 312 and the liquid injection channel 321 are in interference fit, and the size of the valve core 31 gradually increases from the sealing end 312 to the connecting end 313.

[0084] Exemplarily, the shape of the valve core 31 can be frustum-shaped, and the diameter of the valve core 31 gradually increases from the sealing end 312 to the connecting end 313. When the liquid injection valve 30 is switched from the open valve state to the closed valve state, the side of the sealing end 312 away from the connecting end 313 first extends into the liquid injection channel 321. Since the diameter of the sealing end 312 gradually increases from the sealing end 312 to the connecting end 313, it can be guided, reducing the difficulty of the sealing end 312 initially entering the liquid injection channel 321 to achieve interference fit.

[0085] The above setting simplifies the structure of the valve core 31 and facilitates the realization of the interference fit between the valve core 31 and the liquid injection channel 321.

[0086] In some embodiments, the valve cover 32 has a first end and a second end oppositely arranged along the first direction X, the first end faces the valve core 31, and the second end faces away from the valve core 31; wherein, the end face of the second end is inclined downward along the liquid injection channel 321.

[0087] When the valve cover 32 is installed in the installation groove 2121 of the end cover 31 such as, the external shape of the valve cover 32 can guide the valve cover 32 during the movement of the valve cover 32, and in addition, the structure of the valve cover 32 is simplified.

[0088] In some embodiments, in a direction intersecting the first direction X, the diameter of the valve cover 32 gradually increases from the first end to the second end.

[0089] Thus, on the basis of achieving an interference fit between the valve cover 32 and the valve core 31, the volume of the valve cover 32 is reduced, thereby reducing the material required for manufacturing the valve cover 32.

[0090] As Figure 5 shown, in some embodiments, a first groove 322 is provided on the valve cover 32. The first groove 322 is recessed in the direction close to the valve core 31, and a liquid injection channel 321 is provided in the first groove 322.

[0091] The shape of the first groove 322 can be but is not limited to a horn shape. When injecting liquid into the liquid injection channel 321, the first groove 322 can guide the liquid to be injected, so as to accelerate the speed of the liquid to be injected flowing into the liquid injection channel 321 and reduce the residual amount of the liquid to be injected on the surface of the first groove 322.

[0092] Further, as Figure 5 shown, in some embodiments, an operation portion 323 is provided on the side of the valve cover 32 facing away from the valve core 31. The operation portion 323 is used to connect with an external device and pull the valve cover 32 to switch from the closed valve state to the open valve state under an external force.

[0093] Exemplarily, a second groove is formed by recessing the surface of the valve cover 32 facing away from the valve core 31. A connecting rod is provided in the second groove, and the connecting rod is spaced from the bottom wall of the second groove. The second groove and the connecting rod together form the operation portion 323. A user or a manipulator can hold the connecting rod and drive the valve cover 32 to move relative to the valve core 31 through the connecting rod, so as to realize the switching of the liquid injection valve 30 between the open valve state and the closed valve state.

[0094] Thus, by providing the operation portion 323 on the valve cover 32, the relative movement of the valve cover 32 relative to the valve core 31 is realized, which is convenient for the user to operate and reduces the difficulty of driving the valve cover 32 to move relative to the valve core 31.

[0095] It should be noted that a plurality of second grooves can be formed on the valve cover 32, and a connecting rod is provided in each second groove. In other embodiments, a convex block can also be provided on the valve cover 32, and the convex block is configured as the operation portion 323.

[0096] Please refer to Figure 6 and Figure 7 , some embodiments of the present application further provide an end cap assembly 21, which includes an end cap 212 and the liquid injection valve 30 in the above embodiments. The end cap 212 includes a first surface 2122, and an installation groove 2121 is formed on the first surface 2122. A through hole 21211 is formed through the bottom wall of the installation groove 2121; the liquid injection valve 30 is located in the installation groove 2121.

[0097] During liquid injection, by acting on the liquid injection valve 30, the liquid injection valve 30 is switched between an open valve state and a closed valve state. After the liquid to be injected flows out of the liquid injection valve 30, it flows out of the end cap 212 from the outflow end 21211 of the through hole 21211.

[0098] In this way, when the liquid injection valve 30 is in the open valve state, after the liquid to be injected flows out of the liquid injection channel 321, the valve core 31 can buffer the liquid to be injected flowing out of the liquid injection channel 321, change the flow direction and then flow into the liquid infusion channel 311 through the liquid infusion inlet 3111, which can improve the sealing effect between the valve core 31 and the valve cover 32.

[0099] In some embodiments, when the liquid injection valve 30 is in the open valve state, the end face of the valve cover 32 facing away from the valve core 31 is lower than or flush with the first surface 2122, and the liquid injection channel 321 is communicated with the through hole 21211; when the liquid injection valve 30 is in the closed valve state, the end face is lower than the first surface 2122.

[0100] The end cap 212 is used to install the liquid injection valve 30 and cover it in the corresponding housing 22. When it is necessary to inject the liquid to be injected, the liquid injection valve 30 is driven to be in the open valve state, and the liquid to be injected passes through the liquid injection valve 30 and the end cap 212 and then enters the housing 22. When liquid injection is not required, the liquid injection valve 30 is switched from the open valve state to the closed valve state.

[0101] Exemplarily, an installation groove 2121 is provided on the first surface 2122 of the end cap 212. The liquid injection valve 30 is arranged in the installation groove 2121 of the end cap 212. Moreover, the liquid injection valve 30 includes a valve core 31 and a valve cover 32. Among them, the valve core 31 is located at the bottom of the installation groove 2121, and the valve cover 32 is arranged near the opening of the installation groove 2121.

[0102] Assume that the liquid injection valve 30 is in the open valve state, the valve cover 32 is flush with the first surface 2122, or the valve cover 32 is lower than the first surface 2122. At this time, liquid is injected into the liquid injection channel 321 of the valve cover 32. After the injection is completed, the valve cover 32 can be pushed downward until the valve core 31 blocks the liquid injection channel 321, so that the liquid injection valve 30 is switched from the open valve state to the closed valve state. As Figure 8 shown, at this time the valve cover 32 is lower than the first surface 2122. Since the valve cover 32 is lower than the first surface 2122, the valve cover 32 and the installation groove 2121 jointly form a receiving space, and the liquid to be injected remaining on the surface of the valve cover 32 is located in this receiving space and will not flow to the first surface 2122. That is, during the liquid injection stage, the probability that the liquid to be injected flows to the first surface 2122 of the end cap 212 and corrodes the first surface 2122 is reduced, protecting the end cap 212.

[0103] Specifically, as Figure 5As shown, in some embodiments, the installation groove 2121 is recessed along the first direction X, the valve core 31 and the valve cover 32 are arranged along the first direction X, the liquid injection valve 30 further includes an elastic member 32, one end of the elastic member 33 is connected to the valve cover 32, and the other end is connected to the installation groove 2121. The elastic member 33 is used to provide an elastic force along the first direction X to assist the liquid injection valve 30 to switch between the open valve state and the closed valve state.

[0104] The elastic member 33 extends along the first direction X and can be made of materials such as silica gel.

[0105] After the liquid injection valve 30 is installed in the installation groove 2121, since the valve cover 32 and the bottom wall of the installation groove 2121 are connected by the elastic member 33, the connection stability between the valve cover 32 and the installation groove 2121 can be improved, thereby improving the stability of the liquid injection valve 30 installed in the installation groove 2121. In addition, when the liquid injection valve 30 opens and closes the valve, the elastic member 33 will be subjected to an external force and deform. Therefore, the automatic return ability of the valve cover 32 can be improved and the alignment accuracy between the valve core 31 and the valve cover 32 can be improved.

[0106] More specifically, the elastic member 33 is arranged around the valve core 31, and together with the valve cover 32 and the bottom wall of the installation groove 2121, it encloses a closed flow channel, and the flow channel is communicated with the infusion channel 311.

[0107] The shape of the elastic member 33 is similar to a hollow cylinder. When the liquid injection valve 30 is in the open valve state, since the elastic member 33, the valve cover 32 and the bottom wall of the installation groove 2121 together enclose a closed flow channel, the liquid to be injected, after flowing out of the injection channel 321, directly flows into this flow channel and then into the infusion inlet 3111.

[0108] In this way, the above-mentioned flow channel can restrict the liquid to be injected flowing out of the injection channel 321, and can accelerate the efficiency of the liquid to be injected flowing into the infusion inlet 3111. It reduces the probability that the liquid to be injected, after flowing out of the injection channel 321, flows to all around the installation groove 2121, resulting in a small flow rate of the liquid to be injected flowing into the infusion inlet 3111 per unit time and an increase in the residual amount of the liquid to be injected in the installation groove 2121.

[0109] In some embodiments, as Figure 5 shown, the valve core 31 is arranged on the bottom wall of the installation groove 2121. The infusion channel 311 includes a first section 3113 and at least two second sections 3114. One end of the first section 3113 is communicated with the through hole 21211, and the other end is communicated with all the second sections 3114. All the second sections 3114 are spaced apart around the axis of the valve core 31, and infusion inlets 3111 are provided at the ends of all the second sections 3114 away from the first section 3113.

[0110] Exemplarily, as Figure 5As shown, the number of the second sections 3114 is two. The first section 3113 can be arranged to extend along the first direction X, and the second sections 3114 can be arranged to extend along the second direction Y. Finally, the shape of the infusion channel 311 can be in a T shape. The liquid to be injected flowing out of the injection channel 321 can flow into the infusion channel 311 from the infusion inlets 3111 of different second sections 3114, converge at the connection between the second sections 3114 and the first section 3113, and finally flow through the first section 3113 and the through hole 21211.

[0111] In this way, the liquid to be injected flowing out of the injection channel 321 can flow into the infusion channel 311 from different infusion inlets 3111, which can improve the efficiency of the liquid to be injected flowing into the infusion channel 311.

[0112] It should be noted that when the number of the second sections 3114 is multiple, two adjacent second sections 3114 are arranged at intervals to arrange the infusion inlets 3111 in multiple directions, so that the liquid to be input can enter the infusion channel 311 from different infusion inlets 3111, and the efficiency of the liquid to be injected flowing into the infusion channel 311 is improved.

[0113] In some embodiments, a limiting part (not shown in the figure) is provided on the inner wall of the installation groove 2121. When in the closed valve state, the limiting part abuts against the valve cover 32.

[0114] The limiting part can protrude relative to the installation groove 2121. During the process of the injection valve 30 switching from the open valve state to the closed valve state, the valve cover 32 can move in a direction gradually approaching the valve core 31. When the valve cover 32 abuts against the limiting part, the valve cover 32 cannot move any further. At this time, the sealing end 312 blocks the injection channel 321, and the channel between the injection channel 321 and the infusion channel 311 is blocked, which can reduce the phenomenon that the infusion channel 311 is reconnected to the injection channel 321 due to excessive movement of the valve cover 32.

[0115] It should be noted that when no elastic member 33 is provided between the valve cover 32 and the valve core 31, the limiting part can be used to prevent the valve cover 32 from moving excessively relative to the valve core 31 and causing the infusion channel 311 to be reconnected to the injection channel 321. Of course, when an elastic member is provided between the valve cover 32 and the valve core 31, a limiting part can also be provided to prevent the valve cover 32 from moving excessively relative to the valve core 31 and causing the infusion channel 311 to be reconnected to the injection channel 321.

[0116] In addition, some embodiments of the present application also provide a battery cell 20, which is characterized in that it includes a housing 22, an electrode assembly 23 and the end cover assembly 21 in the above embodiments. The electrode assembly 23 is arranged in the housing 22, and the end cover assembly 21 covers the housing 22.

[0117] When the liquid injection valve 30 is in the closed valve state, since the valve cover 32 is lower than the first surface 2122, the valve cover 32 and the installation groove 2121 together form a receiving space. The liquid to be injected remaining on the surface of the valve cover 32 is located in this receiving space and will not flow to the first surface 2122. That is, during the liquid injection stage, the probability that the liquid to be injected flows to the first surface 2122 of the end cap 212 and corrodes the first surface 2122 is reduced, protecting the end cap 212.

[0118] Specifically, in one embodiment, as Figure 7 + shown, some embodiments of the present application provide an end cap assembly 21. The end cap assembly 21 includes an end cap 212 and a liquid injection valve 30. The end cap 212 includes an installation groove 2121 and a first surface 2122. The first surface 2122 is located on the opening side of the installation groove 2121. A through hole 21211 penetrating the end cap 212 is provided in the installation groove 2121. The liquid injection valve 30 is located in the installation groove 2121. The liquid injection valve 30 includes a valve core 31, a valve cover 32, and an elastic member 33. One end of the elastic member 33 is connected to the valve cover 32, and the other end is connected to the installation groove 2121.

[0119] Assume that the liquid injection valve 30 is in the open valve state and the valve cover 32 is flush with the first surface 2122. At this time, the elastic member 33 does not undergo elastic deformation. Inject liquid into the liquid injection channel 321 of the valve cover 32. After the injection is completed, the valve cover 32 can be pushed downward until the valve core 31 blocks the liquid injection channel 321, and the liquid injection valve 30 then switches from the open valve state to the closed valve state. During this process, the elastic member 33 deforms under the action of an external force. When in the closed valve state, the valve cover 32 is lower than the first surface 2122.

[0120] When re-injection or liquid supplement is required, pull the valve cover 32 in the reverse direction. When the valve cover 32 and the valve core 31 are separated, because the elastic member 33 generated a deformation recovery force during the previous deformation, the valve cover 32 can move to the initial position under the action of the elastic recovery force, so that the liquid injection valve 30 switches from the closed valve state to the open valve state. Repeating this process can achieve the opening and closing of the liquid injection valve 30.

[0121] When the liquid injection valve 30 is in the closed valve state, since the valve cover 32 is lower than the first surface 2122, the valve cover 32 and the installation groove 2121 together form a receiving space. The liquid to be injected remaining on the surface of the valve cover 32 is located in this receiving space and will not flow to the first surface 2122. That is, during the liquid injection stage, the probability that the liquid to be injected flows to the first surface 2122 of the end cap 212 and corrodes the first surface 2122 is reduced, protecting the end cap 212.

[0122] The technical features of the above-described embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as within the scope described in this specification.

[0123] The above-described embodiments only express several implementation manners of the present application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present application, several modifications and improvements can still be made, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the appended claims.

Claims

1. A liquid injection valve, characterized in that, The liquid injection valve includes: a valve core, through which an infusion channel is formed; and a valve cover, through which a liquid injection channel is formed; one of the valve cover and the valve core is movably arranged relative to the other along a first direction, so that the liquid injection valve has an open valve state in which the liquid injection channel communicates with the infusion inlet, and a closed valve state in which at least part of the valve core blocks the liquid injection channel; wherein, the infusion channel has the infusion inlet, and the opening direction of the infusion inlet intersects with the first direction.

2. The liquid injection valve according to claim 1, characterized in that, The valve core has a sealing end, a connecting end and a side wall. The sealing end and the connecting end are arranged opposite to each other along the first direction. The side wall is connected between the sealing end and the connecting end. The sealing end blocks the liquid injection channel in the closed valve state, and the infusion inlet is formed on the side wall of the valve core.

3. The liquid injection valve according to claim 2, wherein The infusion channel further has an infusion outlet which is arranged opposite to and communicates with the infusion inlet, and the infusion outlet is formed on the connecting end along the first direction.

4. The liquid injection valve according to claim 2, wherein The sealing end and the liquid injection channel are in interference fit. From the sealing end to the connecting end, the size of the valve core gradually increases.

5. The liquid injection valve according to claim 1, characterized in that, The valve cover has a first end and a second end which are arranged opposite to each other along the first direction. The first end faces the valve core, and the second end faces away from the valve core; wherein, the end face of the second end is inclined downward at a downward slope with respect to the liquid injection channel.

6. The liquid injection valve according to claim 5, characterized in that, In a direction intersecting with the first direction, the diameter of the valve cover gradually increases from the first end to the second end.

7. The liquid injection valve according to claim 1, wherein An operating part is arranged on the side of the valve cover facing away from the valve core. The operating part is used for connecting with an external device and pulling the valve cover to switch from the closed valve state to the open valve state under an external force.

8. An end cap assembly, characterized in that, It includes: an end cover, including a first surface, on which an installation groove is formed, and a through hole is formed through the bottom wall of the installation groove; and the liquid injection valve according to any one of claims 1 to 7, and the liquid injection valve is located in the installation groove.

9. The end cap assembly according to claim 8, wherein, When the liquid injection valve is in the open valve state, the end face of the valve cover facing away from the valve core is lower than or flush with the first surface, and the liquid injection channel communicates with the through hole; When the liquid injection valve is in the closed valve state, the end face is lower than the first surface.

10. The end cap assembly according to claim 8, wherein, The installation groove is recessed along the first direction. The valve core and the valve cover are arranged along the first direction. The liquid injection valve further includes an elastic member. One end of the elastic member is connected to the valve cover, and the other end is connected to the installation groove. The elastic member is used to provide an elastic force along the first direction to assist the liquid injection valve to switch between the open valve state and the closed valve state.

11. The end cap assembly according to claim 8, wherein The valve core is arranged on the bottom wall of the installation groove. The infusion channel includes a first section and at least two second sections. One end of the first section communicates with the through hole, and the other end communicates with all the second sections. All the second sections are spaced apart around the axis of the valve core, and infusion inlets are provided at the ends of all the second sections far away from the first section.

12. The end cap assembly according to claim 8, wherein, A limiting part is arranged on the inner wall of the installation groove. When in the closed valve state, the limiting part abuts against the valve cover.

13. A battery cell, characterized in that, It includes a housing, an electrode assembly and an end cap assembly as described in any one of claims 8 to 12. The electrode assembly is disposed in the housing, and the end cap assembly covers the housing.

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