One-way valve, end cover assembly, battery cell, battery and electric device

Abstract

The present application relates to a one-way valve, an end cover assembly, a battery cell, a battery and an electric device. The one-way valve comprises a valve element and a valve body, wherein the valve body is assembled in an electrolyte injection hole and comprises a fixed portion and a sealing portion, the fixed portion being connected to an end cover, and the sealing portion being connected to the fixed portion and being in sealing fit with the end cover; and the valve element is at least partially fitted into the valve body, and defines and forms, together with the valve body, an overflow channel in communication with the outside, and under the action of an external force, the valve element can drive the sealing portion to deform and separate from the end cover to form an overflow port, which is in communication with the overflow channel. The end cover assembly, the battery cell, the battery and the electric device provided in the present application have a good water barrier effect and a high electrolyte injection efficiency.

Description

One-way valve, end cover assembly, battery cell, battery and electrical device

[0001] Related applications

[0002] This application claims priority to Chinese patent application number 2023221104787, filed on August 7, 2023, entitled “End cover assembly, battery cell, battery and electrical device,” the entire text of which is hereby incorporated by reference.

[0003] This application claims priority to Chinese patent application No. 2024103708947, filed on March 28, 2024, entitled “One-way valve, end cover assembly, battery cell, battery and electrical device,” the entire text of which is hereby incorporated by reference. Technical Field

[0004] The present application relates to the field of battery technology, and in particular to a one-way valve, an end cover assembly, a battery cell, a battery, and an electrical device. Background Art

[0005] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. Electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of the sustainable development of the automotive industry. For electric vehicles, battery technology is a key factor in their development.

[0006] Batteries consist of single cells, which undergo venting and injection processes during manufacturing. During the transition from venting to injection, the injection holes on the end caps of the battery cells remain open, leading to a series of problems such as poor water-blocking and low injection efficiency, significantly limiting battery production capacity.

[0007] Summary of the Invention

[0008] In view of the above problems, the present application provides a one-way valve, an end cover assembly, a battery cell, a battery and an electrical device, which can alleviate the problems of poor water isolation and low liquid injection efficiency in the manufacture of battery cells, thereby improving the production capacity of the end cover assembly, the battery cell, the battery and the electrical device.

[0009] In a first aspect, the present application provides a one-way valve, comprising: a valve core and a valve body; the valve body is assembled in a liquid injection hole and includes a fixed portion and a sealing portion, the fixed portion is connected to an end cap, the sealing portion is connected to the fixed portion and seals with the end cap, the valve core is at least partially fitted within the valve body and defines a flow passage communicating with the valve body to form a flow passage;

[0010] The valve core can drive the sealing portion to deform and separate from the end cover under the action of external force to form a flow port, and the flow port is connected to the flow channel.

[0011] In the present application, when the valve core is not subject to external force, the sealing portion and the end cover seal cooperate and block the flow channel and the internal environment of the battery cell. In this way, the medium cannot be exchanged between the outside and the internal environment of the battery cell, that is, exhaust or liquid injection cannot be performed. The internal environment of the battery cell is minimally affected by the outside, and the water barrier effect is good. Therefore, there is no need to vacuum the battery cell in the subsequent liquid injection process, and the liquid injection efficiency is high. When the valve core is subjected to external force, the sealing portion separates from the end cover and forms a flow port, which is connected to the flow channel. Therefore, the water vapor formed by the evaporation of water in the electrode assembly can be discharged to the outside through the flow port and the flow channel to achieve exhaust. In addition, the electrolyte can also flow into the internal environment of the battery cell through the flow channel and the flow port and achieve liquid injection. Therefore, by providing a one-way valve at the injection hole of the end cover, the influence of the outside on the internal environment of the battery cell during the battery production process can be effectively reduced, and the water barrier effect and liquid injection efficiency of the battery cell can be improved.

[0012] In some embodiments, the valve core is connected to the sealing portion, and can, under the action of an external force, drive the sealing portion to stretch along the thickness direction of the end cover until it is separated from the end cover to form a flow port.

[0013] By setting a valve core connected to the sealing part, the sealing part can be driven to stretch along the thickness direction of the end cover to separate from the end cover under the action of external force to form a flow port. The method of stretching and forming the flow port is simple to operate and facilitates the simplification of the structure of the one-way valve, greatly reducing the manufacturing cost of the one-way valve. When the external force is removed, the sealing part recovers its deformation and re-seals with the end cover. During this process, the residual electrolyte in the valve core flows through the flow channel into the internal environment of the battery cell, which helps to reduce the impact of crystallization or moisture absorption of the electrolyte in the valve core on the performance of the battery cell.

[0014] In some embodiments, the sealing portion and the fixing portion are both elastic structures and are integrally provided.

[0015] The sealing portion and the fixing portion are designed to be elastic components and are arranged in one piece, which is beneficial to simplifying the structure of the valve body and greatly reducing the manufacturing cost of the one-way valve.

[0016] In some embodiments, the sealing portion includes a connecting section and a sealing section, wherein the connecting section is connected between the fixing portion and the sealing section;

[0017] The fixing portion and the sealing section are both sealed with the end cover.

[0018] When the fixed part and the sealing section are both sealed with the end cover, the sealing performance between the one-way valve and the end cover is improved, thereby greatly reducing the possibility of medium exchange between the external and internal environments of the battery cell. The internal environment of the battery cell is minimally affected by the outside world, the water-proof effect is good, the injection efficiency is high, and the risk of electrolyte leakage is low.

[0019] In some embodiments, the surfaces of the fixing portion, the connecting section, and the sealing section facing away from the valve core are surrounded to form a bayonet, and the end cover is held in the bayonet.

[0020] By providing the bayonet, the end cover and the valve body are easily assembled and fit tightly together, which helps to improve the sealing performance between the valve body and the end cover.

[0021] In some embodiments, the valve core and the valve body define a plurality of flow passages, and openings of the flow passages communicating with the flow port are arranged at intervals along the circumference of the valve body.

[0022] With multiple flow channels, battery cells can be quickly vented or injected with liquid, further improving production efficiency.

[0023] In some embodiments, a valve cavity is provided in the valve body, and a valve port and a flow guide port both connected to the valve cavity are provided on the valve body; the valve core is at least partially arranged in the valve cavity, and is surrounded by the cavity wall of the valve cavity to form a flow cavity, and the valve port, the flow cavity and the flow guide port are connected in sequence to form a flow channel.

[0024] In this embodiment, the valve port, the flow chamber, and the guide port are always connected to form a flow passage. When the valve core is subjected to an external force and the sealing portion is deformed and separated from the end cap to form a flow port, the flow passage is directly connected to the flow port to facilitate subsequent exhaust and liquid injection.

[0025] In some embodiments, a valve cavity is provided in the valve body, and a valve port and a guide port both connected to the valve cavity are provided on the valve body; the valve core is at least partially installed in the valve cavity, and a flow channel structure is provided in the valve core, and a flow channel is formed when the flow channel structure is connected to the guide port.

[0026] Under this design, when the valve core is not subjected to external force, the flow channel structure and the guide port cannot be connected to form a flow channel. The one-way valve itself has high sealing performance and excellent sealing performance.

[0027] In some embodiments, a valve core cavity is opened in the valve core, and a flow channel opening and a valve core opening are opened on the valve core, both of which are connected to the valve core cavity; the valve core opening, the valve core cavity and the flow channel opening are connected in sequence and constructed to form a flow channel structure.

[0028] In this embodiment, the flow channel structure is independently provided within the valve core. Simply by providing a flow guide port on the valve body, the flow channel structure can be connected to the flow guide port to form a flow passage. This arrangement helps simplify the structure of the valve body and valve core, and reduces the manufacturing cost of the one-way valve.

[0029] In some embodiments, the valve core includes a first valve core segment, a second valve core segment, and a third valve core segment, and the second valve core segment is connected between the first valve core segment and the third valve core segment;

[0030] The second valve core section includes at least two, which are intersected and arranged in the valve core cavity and divide the valve core cavity into multiple valve core sub-cavities. The valve core port is connected with the valve core sub-cavities to form a flow channel structure.

[0031] The method of dividing the valve core cavity into a plurality of valve core sub-cavities by designing the second valve core section is simple and easy to operate, and facilitates the formation of the flow channel structure.

[0032] In some embodiments, the valve core includes a first valve core segment, a second valve core segment, and a third valve core segment, and the second valve core segment is connected between the first valve core segment and the third valve core segment;

[0033] The second valve core segments include at least two and are spaced apart along the circumference of the valve core.

[0034] This design facilitates the simplification of the valve core structure and reduces the manufacturing cost of the one-way valve.

[0035] In some embodiments, the outer surface of the valve core includes an extrusion surface that abuts at least partially against the inner wall of the fixed portion. The extrusion surface is configured to gradually increase its abutting force against the inner wall of the fixed portion as the valve core moves in the direction in which the valve core drives the sealing portion. This design optimizes the structure of the extrusion surface of the valve core. During the valve opening process, the abutment force exerted by the extrusion surface against the fixed portion gradually increases, causing the fixed portion to deform away from its interior, thereby offsetting or partially offsetting the inward collapse deformation and improving the overall structural stability of the one-way valve.

[0036] In some embodiments, the valve core includes a reference line extending along the thickness of the end cap, and the distance between the extrusion surface and the reference line gradually increases in a direction opposite to the driving direction. This design, in which the distance between the extrusion surfaces gradually increases, gradually increases the amount of outward extrusion of the fixing portion, thereby tightening the connection between the fixing portion and the end cap and further improving the stability of the structure.

[0037] In some embodiments, an abutting protrusion is provided on the inner wall of the fixing portion, and the abutting protrusion abuts against the extrusion surface. This design, the introduction of the abutting protrusion, facilitates the abutment between the valve core and the fixing portion; at the same time, the addition of the abutting protrusion also helps to enhance the structural strength and further improve the structural stability.

[0038] In some embodiments, the abutting protrusion is annularly arranged along the outer circumference of the valve core. In this way, the abutting protrusion is designed as a circular ring structure, so that the abutting protrusion and the extrusion surface abut more evenly, thereby making the valve body more stable during the valve opening process.

[0039] In some embodiments, the abutting protrusion is located at an end of the inner wall of the fixing portion away from the sealing portion. This design makes it easier for the abutting protrusion to bear force against the end cap, so that the fixing portion better abuts against the end cap and improves the stability of the structure.

[0040] In some embodiments, the side of the abutting protrusion facing the valve core includes an abutting surface, which is configured as a curved surface that is raised along a circular arc on the side facing the valve core. This design facilitates the transmission of abutting force and reduces the chance of the fixed portion collapsing inward. It also reduces friction caused by the movement of the extrusion surface on the abutting surface, thereby reducing wear on the extrusion surface.

[0041] In a second aspect, the present application provides an end cover assembly, which includes: an end cover and a one-way valve above it, wherein the end cover is provided with an injection hole along its thickness direction; and the valve body is assembled in the injection hole.

[0042] In a third aspect, the present application provides an end cap assembly, the end cap assembly comprising:

[0043] The end cover is provided with a liquid injection hole along its thickness direction;

[0044] The valve body is assembled in the liquid injection hole and includes a fixed portion and a sealing portion. The fixed portion is connected to the end cover. The sealing portion is connected to the fixed portion and seals with the end cover. The valve body is used to define a flow channel for communicating with the outside between the valve body and the valve core;

[0045] The sealing portion is configured to deform under the action of an external force and separate from the end cover to form a flow port, which is communicated with the flow channel.

[0046] This design, by providing a one-way valve at the injection hole of the end cover, can effectively reduce the impact of the external environment on the internal environment of the battery cell during the battery production process, and improve the water-proof effect and injection efficiency of the battery cell.

[0047] In a fourth aspect, the present application provides a battery cell, comprising:

[0048] a housing having an opening at one end; and

[0049] In the end cover assembly as described in any one of the above embodiments, the end cover is arranged at the opening of the shell, and the flow port is connected between the flow channel and the interior of the shell.

[0050] In a fifth aspect, the present application provides a battery comprising a battery cell as described in any one of the above embodiments.

[0051] In a sixth aspect, the present application provides an electrical device, which includes a battery as described in any one of the above embodiments, and the battery is used to provide electrical energy to the electrical device.

[0052] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without any creative work.

[0054] FIG1 is a schematic structural diagram of a vehicle in some embodiments of the present application.

[0055] FIG2 is an exploded view of a battery in some embodiments of the present application.

[0056] FIG3 is a schematic diagram of the structure of a battery cell in some embodiments of the present application.

[0057] FIG4 is a schematic structural diagram of an end cover assembly in some embodiments of the present application.

[0058] FIG5 is a schematic structural diagram of an end cover assembly in other embodiments of the present application.

[0059] FIG6 is a cross-sectional view of the end cover assembly shown in FIG4 along the AA direction.

[0060] FIG7 is a cross-sectional view of the end cover assembly shown in FIG5 along the BB direction.

[0061] FIG8 is a schematic structural diagram of a one-way valve in an end cover assembly in some further embodiments of the present application.

[0062] FIG9 is a cross-sectional view of the one-way valve shown in FIG8 along the CC direction.

[0063] FIG10 is a top view of the one-way valve shown in FIG8 .

[0064] FIG11 is a schematic structural diagram of the one-way valve in the end cover assembly shown in FIG4 .

[0065] FIG. 12 is an exploded view of the one-way valve shown in FIG. 11 .

[0066] FIG13 is a schematic structural diagram of the valve core in the one-way valve shown in FIG12 .

[0067] FIG14 is an exploded view of the one-way valve in the end cover assembly shown in FIG5 .

[0068] FIG15 is a schematic structural diagram of the one-way valve shown in FIG14 .

[0069] FIG16 is a schematic structural diagram of a one-way valve in an end cover assembly in some other embodiments of the present application.

[0070] FIG17 is a cross-sectional view of the one-way valve shown in FIG16.

[0071] Figure Number:

[0072] 10000, vehicle; 1000, battery; 2000, controller; 3000, motor; 100, battery cell; 200, housing; 10, end cap assembly; 20, housing; 30, electrode assembly; 11, end cap; 111, injection hole; 112, inner end surface; 113, outer end surface; 12, one-way valve; 121, valve core; 1211, valve core port; 1212, flow channel port; 1213, valve core cavity; 1213a, valve core sub-cavity; 1214, flow channel structure; 1215, first valve core segment; 1216, second valve core segment; 1217, third valve core segment; 121 8. Valve core body; 1219. Valve core branch; 12a. Extrusion surface; 12b. Reference line; 12c. Abutment protrusion; 12d. Abutment surface; 122. Valve body; 1221. Fixing portion; 12211. First sealing area; 12212. Second sealing area; 1222. Sealing portion; 12221. Connecting section; 12222. Sealing section; 1223. Valve port; 1224. Guide port; 1225. Valve cavity; 1226. Flow cavity; 1227. Flow sub-cavity; 123. Bayonet; 201. First part; 202. Second part; X, thickness direction; L, spacing. DETAILED DESCRIPTION

[0073] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0074] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0075] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0076] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0077] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0078] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0079] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0080] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0081] Batteries consist of single cells, which undergo venting and injection processes during manufacturing. During the transition from venting to injection, the injection holes on the end caps of the battery cells remain open, leading to a series of problems such as poor water-blocking and low injection efficiency, significantly limiting battery production capacity.

[0082] In some examples, since the electrolyte cannot come into contact with water, the battery cells should be degassed at the exhaust station before being transported to the injection station for injection (electrolyte injection). Exhaust refers to placing the battery cells in a high-temperature and vacuum environment for baking, so that the moisture in the electrode assembly contained in the internal environment of the battery cells can evaporate and be discharged to the outside of the battery cells through the injection holes on the end caps of the battery cells. During the entire exhaust process, the injection holes are always open, which improves the reliability of exhaust. After the exhaust is completed, the battery cells are transported from the exhaust station to the injection station. During this process, the injection holes are still open, resulting in poor water-proofing effect of the battery cells. Water vapor in the environment can easily enter the battery cells through the injection holes, affecting the normal use of the electrolyte injected subsequently. Therefore, when the battery cells are transported to the injection station, it is necessary to evacuate the interior of the battery cells again before performing the injection operation. The vacuuming takes a long time, which greatly prolongs the time the battery cells stay in the injection station and reduces the injection efficiency.

[0083] In order to alleviate the problems of poor water isolation and low injection efficiency caused by the opening of the injection hole of the battery cell, the present application provides a one-way valve for sealing or opening the injection hole on the end cover. The one-way valve includes a valve core and a valve body. The valve body is assembled in the injection hole, and the valve body has a sealing portion. The valve core is at least partially connected to the valve body and defines a flow channel connected to the outside with the valve body.

[0084] When the valve core is not subject to external forces, the sealing portion and the end cap seal in cooperation to block the connection between the flow channel and the internal environment of the battery cell. In this way, the medium cannot be exchanged between the external and internal environments of the battery cell, the accommodating cavity is less affected by the outside world, and the water-proof effect is good. Therefore, in the subsequent injection process, there is no need to evacuate the internal environment of the battery cell, and the injection efficiency is high. When the valve core is subjected to external forces and drives the sealing portion to deform, the sealing portion separates from the end cap and forms a flow port, which is connected to the flow channel. Therefore, the water vapor formed by the evaporation of water in the electrode assembly can be discharged to the outside through the flow port and the flow channel, while the electrolyte can flow into the interior of the battery cell through the flow channel and the flow port to achieve injection.

[0085] Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle 10000 in some embodiments of the present application.

[0086] The present embodiment provides an electrical device using a battery 1000 as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0087] It should be understood that the technical solutions described in the embodiments of the present application are not limited to being applicable to the electrical devices described above, but for the sake of simplicity, the following embodiments are all described using the electrical device being vehicle 10000 as an example.

[0088] The vehicle 10000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1000 is provided inside the vehicle 10000. The battery 1000 may be provided at the bottom, head or tail of the vehicle 10000. The battery 1000 may be used to power the vehicle 10000. For example, the battery 1000 may serve as an operating power source for the vehicle 10000. The vehicle 10000 may further include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery 1000 to power the motor 3000, for example, to meet the power requirements for starting, navigating and driving the vehicle 10000.

[0089] In some embodiments of the present application, the battery 1000 can serve not only as an operating power source for the vehicle 10000, but also as a driving power source for the vehicle 10000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 10000.

[0090] Please refer to FIG. 2 , which is an exploded view of a battery 1000 in some embodiments of the present application.

[0091] The battery 1000 includes a housing 200 and a battery cell 100, with the battery cell 100 being housed within the housing 200. The housing 200 is used to provide a housing for the battery cell 100, and the housing 200 can have a variety of structures. In some embodiments, the housing 200 can include a first portion 201 and a second portion 202, which overlap with each other, and together define a housing for accommodating the battery cell 100. The second portion 202 can be a hollow structure with one end open, and the first portion 201 can be a plate-like structure, with the first portion 201 overlapping the open side of the second portion 202, so that the first portion 201 and the second portion 202 together define a housing. The first portion 201 and the second portion 202 can also be hollow structures with one end open, with the open side of the first portion 201 overlapping the open side of the second portion 202. Of course, the box body 200 formed by the first part 201 and the second part 202 can be in various shapes, such as a cylinder, a cuboid, etc.

[0092] In the battery 1000, there may be multiple battery cells 100, and the multiple battery cells 100 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 100. The multiple battery cells 100 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery cell 100 may be housed within the housing 200. Of course, the battery 1000 may also be a battery module formed by first connecting multiple battery cells 100 in series, in parallel, or in a hybrid connection, and then the multiple battery modules are further connected in series, in parallel, or in a hybrid connection to form an entire battery cell, and then housed within the housing 200. The battery 1000 may also include other structures, for example, the battery 1000 may also include a busbar component for electrically connecting the multiple battery cells 100.

[0093] Each battery cell 100 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto.

[0094] Please refer to Figures 3, 4, 5, 6 and 7. Figure 3 is a structural schematic diagram of the battery cell 100 in some embodiments of the present application, Figure 4 is a structural schematic diagram of the end cover assembly 10 in some embodiments of the present application, Figure 5 is a structural schematic diagram of the end cover assembly 10 in other embodiments of the present application, Figure 6 is a cross-sectional view of the end cover assembly 10 shown in Figure 4 along the AA direction, and Figure 7 is a cross-sectional view of the end cover assembly 10 shown in Figure 5 along the BB direction.

[0095] The battery cell 100 is the smallest unit constituting the battery 1000. The battery cell 100 includes an electrode assembly 30, a housing 20, and an end cap assembly 10.

[0096] The electrode assembly 30 is a component in the battery cell 100 where electrochemical reactions occur. One or more electrode assemblies 30 may be included in the battery cell 100. The electrode assembly 30 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 parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly 30, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute a tab (not shown in the figure). The positive electrode tab and the negative electrode tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 1000, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0097] The housing 20 is a component that cooperates with the end cap 11 in the end cap assembly 10 to form an internal environment for the battery cell 100. This internal environment can be used to accommodate the electrode assembly 30, electrolyte (not shown), and other components. The housing 20 and end cap 11 can be separate components. An opening can be provided in the housing 20, and the end cap 11 is placed over the opening to form the internal environment of the battery cell 100. Alternatively, the end cap 11 and housing 20 can be integrated. In some examples, the end cap 11 and housing 20 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 20 needs to be enclosed, the end cap 11 is placed over the housing 20. The housing 20 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. In some examples, the shape of the housing 20 can be determined based on the specific shape and size of the electrode assembly 30. The housing 20 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this embodiment of the present application does not impose any particular limitations on this.

[0098] The end cap assembly 10 includes an end cap 11, which is a component that fits over the opening of the housing 20 to isolate the internal environment of the battery cell 100 from the outside. The shape of the end cap 11 can be adapted to the shape of the housing 20 to fit the housing 20. For example, the end cap 11 can be made of a material with a certain degree of hardness and strength (such as an aluminum alloy). This prevents the end cap 11 from deforming when subjected to compression or collision, thereby enhancing the structural strength and safety of the battery cell 100. Functional components such as electrode terminals can be provided on the end cap 11. The electrode terminals can be used to electrically connect to the electrode assembly 30 to output or input electrical energy to or from the battery cell 100. In some embodiments, the end cap 11 can also be provided with a pressure relief mechanism for relieving internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold. In some embodiments, an insulating member can be provided on the inside of the end cap 11 to isolate the electrical components within the housing 20 from the end cap 11 to reduce the risk of short circuits. For example, the insulating member may be made of plastic, rubber, or the like.

[0099] Please refer to Figures 4 to 7 again. In the first aspect, according to one or more embodiments of the present application, the present application provides a one-way valve 12. The one-way valve 12 includes a valve core 121 and a valve body 122; the valve body 122 is assembled in the liquid injection hole 111 and includes a fixing portion 1221 and a sealing portion 1222. The fixing portion 1221 is connected to the end cover 11, and the sealing portion 1222 is connected to the fixing portion 1221 and seals with the end cover 11. The valve core 121 is at least partially fitted in the valve body 122 and defines a flow channel connected to the outside with the valve body 122; wherein, the valve core 121 can drive the sealing portion 1222 to deform under the action of an external force and separate from the end cover 11 to form a flow port, and the flow port is connected to the flow channel.

[0100] Please refer to FIG. 3 and FIG. 8 at the same time. FIG. 8 is a schematic structural diagram of the one-way valve 12 of the end cover assembly 10 in the third embodiment of the present application.

[0101] It's worth noting that the internal environment of the battery cell 100 is defined by the end cap 11 and the housing 20. The liquid injection hole 111 of the end cap 11 is formed by the end cap 11 itself. The liquid injection hole 111 and the internal environment of the battery cell 100 are neither identical nor equivalent. The end cap 11 has an outer end surface 113 and an inner end surface 112 that are positioned opposite each other along its thickness direction X. The inner end surface 112 and the inner wall of the housing 20 define the internal environment of the battery cell 100. The outer end surface 113 faces away from the internal environment of the battery cell 100. The liquid injection hole 111 on the end cap 11 passes through the outer end surface 113 and the inner end surface 112 in sequence.

[0102] The valve body 122 and the valve core 121 can be formed separately or integrally. In some embodiments, as shown in Figures 6 and 7, the valve body 122 and the valve core 121 are formed separately, while as shown in Figure 8, the valve body 122 and the valve core 121 are integrally formed.

[0103] Referring again to Figures 6 to 8 , the fixing portion 1221 is fixed to the end cap 11. Regardless of whether external forces act on the valve core 121, the fixing portion 1221 remains in a fixed position relative to the end cap 11. The fixing portion 1221 can be located within the injection hole 111 and engage with the wall of the injection hole 111; alternatively, the fixing portion 1221 can be located on the side of the end cap 11 facing away from the interior of the housing 20 and abut against the outer end surface 113 of the end cap 11.

[0104] The sealing part 1222 is an elastic component. Under the action of external force, it separates from the end cover 11 by deformation such as contraction and extension to form a flow outlet. When the external force is removed, the sealing part 1222 automatically restores its deformation and seals with the end cover 11 again.

[0105] Exemplarily, the sealing portion 1222 can achieve a sealed fit between the sealing portion 1222 and the end cover 11 by abutting against the hole wall of the liquid injection hole 111. In this embodiment, a flow outlet is formed when the sealing portion 1222 is separated from the hole wall of the liquid injection hole 111; and / or, the sealing portion 1222 can also achieve a sealed fit between the sealing portion 1222 and the end cover 11 by being received in the internal environment of the battery cell 100 and abutting against the inner end surface 112 of the end cover 11. In this embodiment, a flow outlet is formed when the sealing portion 1222 is separated from the inner end surface 112 of the end cover 11.

[0106] During actual production, the one-way valve 12, end cap 11, housing 20, and electrode assembly 30 are pre-packaged to form a battery cell 100. During venting, the battery cell 100 is located in the venting station and placed in a high-temperature, vacuum environment. A porous plate is used to press against the valve core 121. The opening of the flow channel, away from the flow port, communicates with the outside through the pore structure on the porous plate. Under the action of gravity on the porous plate, the valve core 121 sinks, driving the sealing portion 1222 to deform and separate from the end cap 11 to form a flow port. In this way, moisture within the electrode assembly 30 is evaporated by heat and sequentially flows through the flow port, the flow channel, and the pore structure of the porous plate to be discharged to the outside. After venting is completed, the porous plate is raised and its effect on the valve core 121 is released. Since the sealing portion 1222 has already deformed when it separated from the end cap 11, when the porous plate's effect on the valve core 121 is released, the sealing portion 1222 rebounds and re-engages with the end cap 11 in a sealed manner. At this time, the flow port is closed again, isolating the outside from the internal environment of the battery cell 100 , greatly reducing the medium exchange between the outside and the inside of the battery cell 100 , so that a high vacuum degree can still be maintained inside the battery cell 100 .

[0107] It is understood that the medium refers to a substance existing in the external environment and / or the internal environment of the battery cell 100. The substance existing in the external environment may be water vapor, air, etc. The substance existing in the internal environment of the battery cell 100 may be an electrolyte.

[0108] Afterwards, the battery cell 100 is transported to the liquid filling station for liquid filling. During the process of transporting the battery cell 100 from the exhaust station to the liquid filling station, the flow channel in the one-way valve 12 is always isolated from the internal environment of the battery cell 100, so the battery cell 100 still has a high degree of vacuum. Therefore, when the battery cell 100 is transported to the liquid filling station, it is not necessary to evacuate the battery cell 100.

[0109] During injection, the injection nozzle's rubber sleeve depresses the valve core 121, causing the valve core 121 to sink again, driving the sealing portion 1222 to separate from the end cap 11 and forming a flow port. In this way, the electrolyte flowing out of the injection nozzle flows through the flow channel and the flow port into the battery cell 100. After injection is completed, the injection nozzle is removed. At this time, when the pressure exerted by the injection nozzle on the valve core 121 disappears, the sealing portion 1222 and the end cap 11 reseal and cooperate, isolating the internal environment of the battery cell 100 from the outside of the battery cell 100, allowing the electrolyte to be sealed inside the battery cell 100 and undergo a chemical reaction.

[0110] It is worth mentioning that in order to reduce the risk of electrolyte leakage, during the injection process, the injection sleeve of the injection nozzle should also seal the fixed part 1221 at the same time, so as to reduce the possibility of electrolyte overflowing from the gap between the injection sleeve of the injection nozzle and the fixed part 1221.

[0111] It can be understood that during exhaust, the gravity of the porous plate is the external force acting on the valve core 121 , and during liquid injection, the pressure of the injection nozzle is the external force acting on the valve core 121 .

[0112] It can be seen that in the present application, when the valve core 121 is not subject to external force, the sealing portion 1222 is sealed with the end cover 11 and blocks the flow channel and the internal environment of the battery cell 100. In this way, there is no possibility of medium exchange between the outside and the internal environment of the battery cell 100, that is, no exhaust or injection is possible. The internal environment of the battery cell 100 is minimally affected by the outside, and the water barrier effect is good. Therefore, there is no need to evacuate the battery cell 100 in the subsequent injection process, and the injection efficiency is high. When the valve core 121 is subject to external force, the sealing portion 1222 separates from the end cover 11 and forms a flow port, which is connected to the flow channel. Therefore, the water vapor formed by the evaporation of water in the electrode assembly 30 can be discharged to the outside through the flow port and the flow channel to achieve exhaust. In addition, the electrolyte can also flow into the internal environment of the battery cell 100 through the flow channel and the flow port and achieve injection.

[0113] Therefore, by providing a one-way valve 12 at the injection hole 111 of the end cover 11, the external impact on the internal environment of the battery cell 100 during the production of the battery 1000 can be effectively reduced, thereby improving the water isolation effect and injection efficiency of the battery cell 100.

[0114] Please refer to FIG. 6 to FIG. 9 . FIG. 9 is a cross-sectional view of the one-way valve 12 along the CC direction in the third embodiment of the present application.

[0115] In one or more embodiments of the present application, the valve core 121 is connected to the sealing portion 1222 , and can drive the sealing portion 1222 to stretch along the thickness direction X of the end cover 11 under the action of external force to separate from the end cover 11 to form a flow port.

[0116] In some examples, at least the sealing portion 1222 is an elastic component. Under the action of an external force, the valve core 121 causes the sealing portion 1222 to stretch along the thickness direction X of the end cap 11, thereby increasing the portion of the sealing portion 1222 extending into the internal environment of the battery cell 100. Furthermore, the sealing portion 1222 separates from the inner end surface 112 of the end cap 11 and / or the wall of the liquid injection hole 111, forming a flow outlet.

[0117] By setting the valve core 121 to be connected with the sealing part 1222, the sealing part 1222 can be driven to stretch along the thickness direction X of the end cover 11 to separate from the end cover 11 under the action of external force to form a flow port. The method of stretching and forming a flow port is simple to operate, and it is convenient to simplify the structure of the one-way valve 12, which greatly reduces the manufacturing cost of the one-way valve 12. When the external force is removed, the sealing part 1222 recovers its deformation and the sealing part 1222 is sealed with the end cover 11 again. In this process, the residual electrolyte in the valve core 121 flows into the internal environment of the battery cell 100 through the flow channel, which helps to reduce the crystallization or moisture absorption of the electrolyte in the valve core 121 and affect the performance of the battery cell 100.

[0118] Furthermore, in one or more embodiments of the present application, the sealing portion 1222 and the fixing portion 1221 are both elastic structures and are integrally provided.

[0119] In this way, the sealing portion 1222 and the fixing portion 1221 form an elastic valve body 122 .

[0120] The sealing portion 1222 and the fixing portion 1221 are both elastic components and are integrally provided, which is beneficial to simplifying the structure of the valve body 122 and significantly reducing the manufacturing cost of the one-way valve 12 .

[0121] In one or more embodiments of the present application, the sealing portion 1222 includes a connecting section 12221 and a sealing section 12222 , wherein the connecting section 12221 is connected between the fixing portion 1221 and the sealing section 12222 ; both the fixing portion 1221 and the sealing section 12222 are sealed with the end cover 11 .

[0122] The sealing portion 1222 includes a connecting section 12221 and a sealing section 12222. The connecting section 12221 is located within the liquid injection hole 111 and connected between the fixing portion 1221 and the sealing section 12222. The valve core 121 is connected to the sealing section 12222. In some embodiments, referring to FIG6 , the sealing section 12222 is located outside the liquid injection hole 111 and is housed within the internal environment of the battery 1000. The sealing section 12222 presses against the inner end surface 112 of the end cap 11 to achieve a sealed fit. In this embodiment, under the action of an external force, the valve core 121 drives the connecting section 12221 to stretch, so that the sealing section 12222 can move relative to the end cap 11 along the thickness direction X of the end cap 11, separate from the inner end surface 112 of the end cap 11, and form a flow outlet. 7 and 9 , in some embodiments, the sealing section 12222 is at least partially located within the injection hole 111 and abuts against the wall of the injection hole 111 to achieve a sealed fit. In this embodiment, when an external force is applied, the valve core 121 causes the connecting section 12221 to stretch, allowing the sealing section 12222 to move relative to the end cap 11 in the thickness direction X of the end cap 11, separating from the wall of the injection hole 111 to form a flow opening.

[0123] In some examples, after the one-way valve 12 is assembled, the battery cell 100 is always sealed with the end cover 11, and the sealing section 12222 is selectively sealed with or disconnected from the end cover 11. In addition, it is worth mentioning that when the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the valve core 121 and the fixing portion 1221 can also be sealed or spaced apart. For example, taking Figures 6 and 7 as examples, when the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the valve core 121 and the fixing portion 1221 are also sealed. For another example, when the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the valve core 121 and the fixing portion 1221 are spaced apart.

[0124] The fixing portion 1221 and the end cap 11 can be sealed using an inclined surface seal and / or a flat surface seal. An inclined surface seal means that the surfaces sealing the fixing portion 1221 and the end cap 11 are both inclined surfaces. An inclined surface refers to a surface structure that is inclined relative to the thickness direction X of the end cap 11. A flat surface seal means that the surfaces sealing the fixing portion 1221 and the end cap 11 are both flat surfaces. A flat surface refers to a surface structure that is perpendicular to the thickness direction X of the end cap 11. Similarly, the sealing section 12222 and the end cap 11 can also be sealed using an inclined surface seal and / or a flat surface seal.

[0125] In some embodiments, using FIG. 6 as an example, the surface of the fixing portion 1221 facing the end cap 11 includes a first sealing area 12211 and a second sealing area 12212. The first sealing area 12211 is disposed around the periphery of the second sealing area 12212 and is arranged and connected along the thickness direction X of the end cap 11. The first sealing area 12211 is an annular plane, and the second sealing area 12212 is an annular inclined surface. The first sealing area 12211 is planarly sealed with the outer end surface 113 of the end cap 11, while the second sealing area 12212 is sealed with the inclined surface of the wall of the injection hole 111. The sealing section 12222 is located within the accommodating cavity, and the surface of the sealing section 12222 facing the end cap 11 is planarly sealed with the inner end surface 112 of the end cap 11.

[0126] In this embodiment, during venting or injection, valve core 121 sinks, driving sealing section 12222 to stretch connecting section 12221. Sealing section 12222 sinks and separates from inner end surface 112 of end cap 11, forming a flow opening. After venting or injection, connecting section 12221 recovers its shape, and sealing section 12222 re-engages with inner end surface 112 of end cap 11.

[0127] In some embodiments, taking FIG. 7 as an example, in FIG. 2 , the surface of the fixing portion 1221 facing the end cap 11 includes only the second sealing area 12212, which is sealed against the inclined surface of the wall of the injection hole 111. Taking FIG. 8 as an example, the sealing method between the fixing portion 1221 and the end cap 11 in FIG. 8 is the same as the sealing method between the fixing portion 1221 and the end cap 11 in FIG. 1 , and therefore will not be further described here.

[0128] In Figures 7 and 8, sealing section 12222 seals against the inclined surface of the injection hole 111. During venting or injection, valve core 121 sinks, driving sealing section 12222, which in turn stretches connecting section 12221. Separating sealing section 12222 from the injection hole 111, the flow opening is formed. After venting or injection, connecting section 12221 returns to its original shape, and sealing section 12222 re-seals against the inclined surface of the injection hole 111.

[0129] When the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the sealing performance between the one-way valve 12 and the end cover 11 is improved, thereby greatly reducing the possibility of medium exchange between the external environment and the internal environment of the battery cell 100. The internal environment of the battery cell 100 is minimally affected by the external environment, has a good water-proof effect, high liquid injection efficiency, and a low risk of electrolyte leakage.

[0130] Please refer to Figure 6 and Figure 7 again. In one or more embodiments of the present application, the fixing portion 1221, the connecting section 12221 and the sealing section 12222 are arranged on the surface facing away from the valve core 121 to form a bayonet 123, and the end cover 11 is held in the bayonet 123.

[0131] By providing the bayonet 123 , the end cover 11 and the valve body 122 are easily assembled and tightly fitted, which helps to improve the sealing performance between the valve body 122 and the end cover 11 .

[0132] In one or more embodiments of the present application, the valve core 121 and the valve body 122 define a plurality of flow channels, and openings of the flow channels communicating with the flow ports are arranged at intervals along the circumference of the valve body 122 .

[0133] The flow channels may be independently arranged, or may partially overlap with each other, which is not specifically limited here.

[0134] With the provision of multiple flow channels, the battery cells 100 can be quickly vented or injected with liquid, further improving production efficiency.

[0135] Please refer to Figure 8 again, and also refer to Figure 9 and Figure 10. Figure 10 is a top view of the one-way valve in the third embodiment of the present application.

[0136] In one or more embodiments of the present application, a valve cavity 1225 is provided in the valve body 122, and a valve port 1223 and a flow guide port 1224, both of which are connected to the valve cavity 1225, are provided on the valve body 122; the valve core 121 is at least partially arranged in the valve cavity 1225, and is surrounded by the cavity wall of the valve cavity 1225 to form a flow cavity 1226, and the valve port 1223, the flow cavity 1226 and the flow guide port 1224 are connected in sequence to form a flow channel.

[0137] In some examples, the valve core 121 may be partially located within the valve cavity 1225, with the remaining portion extending outside the valve port 1223. Alternatively, the valve core 121 may be completely located within the valve cavity 1225. To improve the reliability of the valve core 121's actuation, the remaining portion of the valve core 121 is extended outside the valve port 1223. In this way, during the exhaust process, the porous plate can drive the valve core 121 to sink relative to the valve body 122, and during the injection process, the injection nozzle can also drive the valve core 121 to sink relative to the valve body 122.

[0138] The fixing portion 1221 is annular and has a valve port 1223 formed on one end of the fixing portion 1221 away from the sealing section 1222. The fixing portion 1221 and the sealing portion 1222 enclose a valve cavity 1225, and the guide port 1224 is provided on the sealing portion 1222.

[0139] In some embodiments, the valve core 121 may include only a valve core body 1218, which is disposed within the valve cavity 1225. A flow chamber 1226 is defined between the outer wall of the valve core body 1218 and the wall of the valve cavity 1225. In some embodiments, the valve core 121 may include, in addition to the valve core body 1218, a plurality of valve core branches 1219. All of the valve core branches 1219 are spaced apart along the circumference of the valve core body 1218 and divide the flow chamber 1226 into a plurality of flow sub-cavities 1227. Specifically, a flow sub-cavity 1227 is defined between the valve core body 1218 and each of two adjacent valve core branches 1219.

[0140] The sealing portion 1222 includes a connecting section 12221 and a sealing section 12222. In some embodiments, the connecting section 12221 can be a continuous annular structure having one or multiple flow guide ports 1224 spaced apart along the circumference of the valve body 122. In some embodiments, there are multiple connecting sections 12221 spaced apart along the circumference of the valve body 122, with a flow guide port 1224 defined between each two adjacent connecting sections 12221. Each connecting section 12221 can extend along the thickness direction X of the end cap 11 or along the radial direction of the liquid injection hole 111.

[0141] The number of the guide ports 1224 can be one or more and can be set according to specific needs.

[0142] Taking the case where the flow chamber 1226 is not divided into the flow sub-chamber 1227 and there is only one flow guide port 1224 as an example, the valve port 1223, the flow chamber 1226 and the flow guide port 1224 are sequentially connected to form a flow channel. In this embodiment, the one-way valve 12 has only one flow channel.

[0143] Taking the case where the flow chamber 1226 is not divided to form a flow sub-chamber 1227, and there are multiple flow guide ports 1224, which are arranged at circumferential intervals along the valve body 122, as an example, the valve port 1223, the flow chamber 1226 and each flow guide port 1224 are connected in sequence to form a flow channel. In this embodiment, there are multiple flow channels in the one-way valve 12, and all the flow channels share the valve port 1223 and the flow chamber 1226.

[0144] Taking the example of a case where the flow chamber 1226 is divided into flow sub-chambers 1227, and a single flow guide port 1224 extends circumferentially along the valve body 122, the valve port 1223, each flow sub-chamber 1227, and the flow guide port 1224 are sequentially connected to form a flow channel. In this embodiment, the one-way valve 12 has multiple flow channels, and all of the flow channels share the valve port 1223 and the flow guide port 1224.

[0145] Taking the example of the flow chamber 1226 being divided to form a flow sub-chamber 1227, and the flow sub-chamber 1227 corresponding to the flow guide port 1224 one-to-one, the valve port 1223, the flow sub-chamber 1227 and the flow guide port 1224 corresponding to the flow sub-chamber 1227 are connected in sequence to form a flow channel. In this embodiment, there are multiple flow channels in the one-way valve 12, and all the flow channels only share the valve port 1223.

[0146] In this embodiment, the valve port 1223, the flow chamber 1226, and the guide port 1224 are always connected to form a flow passage. When the valve core 121 is subjected to an external force and the sealing portion 1222 is deformed and separated from the end cap 11 to form a flow opening, the flow passage is directly connected to the flow opening to facilitate subsequent exhaust and liquid injection.

[0147] Please refer to Figures 11 to 15, Figure 11 is a structural schematic diagram of the one-way valve 12 of the end cover assembly 10 in the first embodiment, Figure 12 is an exploded view of the one-way valve 12 of the end cover assembly 10 in the first embodiment, Figure 13 is a structural schematic diagram of the valve core 121 of the one-way valve 12 in the first embodiment, Figure 14 is an exploded view of the one-way valve 12 of the end cover assembly 10 in the second embodiment, and Figure 15 is a structural schematic diagram of the one-way valve 12 of the end cover assembly 10 in the second embodiment.

[0148] In one or more embodiments of the present application, a valve cavity 1225 is provided in the valve body 122, and a valve port 1223 and a guide port 1224 both of which are connected to the valve cavity 1225 are provided on the valve body 122; the valve core 121 is at least partially installed in the valve cavity 1225, and a flow channel structure 1214 is provided in the valve core 121, and a flow channel is formed when the flow channel structure 1214 is connected to the guide port 1224.

[0149] The flow channel structure 1214 in the valve core 121 can be one or more, and the flow guide port 1224 on the valve body 122 can be one or more. Taking the case where there is one flow channel structure 1214 in the valve core 121 and one flow guide port 1224 on the valve body 122 as an example, when the flow channel structure 1214 is connected with the flow guide port 1224, an overflow channel is formed. In this embodiment, the one-way valve 12 has only one overflow channel. Taking the case where there is one flow channel structure 1214 in the valve core 121 and multiple flow guide ports 1224 on the valve body 122 as an example, the flow channel structure 1214 is continuously arranged along the circumference of the valve core 121, and the flow channel structure 1214 is connected with each flow guide port 1224 to form an overflow channel. In this embodiment, the one-way valve 12 has multiple overflow channels, and all overflow channels share the same flow channel structure 1214. Taking the example of a case where there are multiple flow channel structures 1214 within the valve core 121 and a single flow guide port 1224 on the valve body 122, with the flow guide ports 1224 arranged continuously along the circumference of the connecting section 12221, all flow channel structures 1214 are arranged at intervals along the circumference of the valve core 121, and each flow channel structure 1214 forms a flow channel when connected to the same flow guide port 1224. In this embodiment, the one-way valve 12 has multiple flow channels, and all of the flow channels share the same flow guide port 1224. Taking the example of a plurality of flow channel structures 1214 within the valve core 121 and a plurality of flow guide ports 1224 on the valve body 122, all flow channel structures 1214 are spaced apart along the circumference of the valve core 121, and the flow guide ports 1224 are spaced apart along the circumference of the valve body 122, corresponding one-to-one with all flow channel structures 1214. Each flow channel structure 1214 communicates with a corresponding flow guide port 1224 to form a flow passage. In this embodiment, the one-way valve 12 has multiple flow passages, and each flow passage is independently arranged.

[0150] When the valve core 121 is not subjected to external force, the valve core 121 is at least partially located in the valve cavity 1225, and the valve core 121 is sealed with the cavity wall of the valve cavity 1225 to improve the sealing performance of the one-way valve 12. When the valve core 121 is subjected to external force, the valve core 121 sinks and drives the sealing section 12222 to separate from the end cover 11 to form a flow port. At the same time, the valve core 121 moves relative to the fixed portion 1221 to connect the flow channel structure 1214 with the guide port 1224 to form a flow channel. Under this design, when the valve core 121 is not subjected to external force, the flow channel structure 1214 and the guide port 1224 fail to connect to form a flow channel, and the one-way valve 12 itself has high sealing and excellent sealing performance.

[0151] Furthermore, in one or more embodiments of the present application, a valve core cavity 1213 is provided in the valve core 121, and a flow channel opening 1212 and a valve core opening 1211 are provided on the valve core 121, both of which are connected to the valve core cavity 1213; the valve core opening 1211, the valve core cavity 1213 and the flow channel opening 1212 are connected in sequence and constructed to form a flow channel structure 1214.

[0152] Among them, the valve core 121 includes a first valve core segment 1215, a second valve core segment 1216 and a third valve core segment 1217. The first valve core segment 1215, the second valve core segment 1216 and the third valve core segment 1217 are arranged in sequence along the thickness direction X of the end cover 11, and the second valve core segment 1216 is connected between the first valve core segment 1215 and the third valve core segment 1217.

[0153] The first valve core segment 1215 is annular and has a valve core opening 1211 formed on one end of the first valve core segment 1215 away from the third valve core segment 1217. The first valve core segment 1215, the second valve core segment 1216, and the third valve core segment 1217 enclose a valve core cavity 1213, and the guide opening 1224 is defined by the second valve core segment 1216.

[0154] In some embodiments, the second valve core segment 1216 can be a continuous annular structure having one or multiple flow passages 1212 spaced apart along the circumference of the valve core 121. In some embodiments, there are multiple second valve core segments 1216 spaced apart along the circumference of the valve core 121, with a flow passage 1212 defined between each two adjacent second valve core segments 1216. Each second valve core segment 1216 extends along the thickness direction X of the end cap 11.

[0155] In this embodiment, the flow channel structure 1214 is independently provided within the valve core 121. Simply by providing a flow guide port 1224 on the valve body 122, the flow channel 1214 can be formed when communicating with the flow guide port 1224. This arrangement facilitates simplifying the structure of the valve body 122 and the valve core 121, thereby reducing the manufacturing cost of the one-way valve 12.

[0156] Furthermore, in one or more embodiments of the present application, the valve core 121 includes a first valve core segment 1215 , a second valve core segment 1216 , and a third valve core segment 1217 , wherein the second valve core segment 1216 is connected between the first valve core segment 1215 and the third valve core segment 1217 ;

[0157] Please refer to Figure 13 again. The second valve core section 1216 includes at least two, which are intersectingly arranged in the valve core cavity 1213 and divide the valve core cavity 1213 into multiple valve core sub-cavities 1213a. The valve core port 1211 is connected to the valve core sub-cavities 1213a to form a flow channel structure 1214.

[0158] In this embodiment, each flow channel structure 1214 shares the same valve port 1223 .

[0159] The method of dividing the valve core cavity 1213 into a plurality of valve core sub-cavities 1213 a by designing the second valve core segment 1216 is simple and easy to operate, and facilitates the formation of the flow channel structure 1214 .

[0160] Please refer to Figures 14 to 15 again. In one or more embodiments of the present application, the valve core 121 includes a first valve core segment 1215, a second valve core segment 1216 and a third valve core segment 1217. The second valve core segment 1216 is connected between the first valve core segment 1215 and the third valve core segment 1217. The second valve core segment 1216 includes at least two and is arranged at intervals along the circumference of the valve core 121.

[0161] In some examples, the second valve core segment 1216 extends along the thickness direction X of the end cap 11, and a guide port 1224 is formed between each adjacent second valve core segment 1216. In this embodiment, the valve core port 1211, the valve core cavity 1213, and each guide port 1224 are sequentially connected to form a flow channel structure 1214. The one-way valve 12 has multiple flow channel structures 1214, and all flow channel structures 1214 share the valve core port 1211 and valve core cavity 1213.

[0162] This design facilitates simplifying the structure of the valve core 121 and reducing the manufacturing cost of the one-way valve 12 .

[0163] Please refer to Figure 16. In one or more embodiments of the present application, the outer surface of the valve core 121 includes an extrusion surface 12a, which abuts against at least part of the inner wall of the fixed portion 1221, and the extrusion surface 12a is configured to gradually increase the abutment force against the inner wall of the fixed portion 1221 when the valve core 121 moves along the driving direction of the sealing portion 1222.

[0164] The extrusion surface 12a refers to the area of ​​the valve core 121 that abuts against at least a portion of the inner wall of the valve body 122 when the valve core 121 is at least partially engaged within the valve body 122. When the valve is opened, the compression and deformation of the sealing portion 1222 exert a pulling force on the fixing portion 1221 toward the interior of the battery cell 100. This can easily cause the fixing portion 1221 to collapse inward due to the pulling force, thereby causing the structure of the one-way valve 12 on the end cap 11 to become unstable.

[0165] To this end, the structure of the extrusion surface 12a of the valve core 121 is optimized. During the valve opening process, when the valve core 121 squeezes the sealing part 1222 downward to drive it to deform, the abutment force of the extrusion surface 12a on the fixed part 1221 gradually increases, causing the fixed part 1221 to deform in a direction away from its own interior, offsetting or partially offsetting the inward collapse deformation, thereby making the structure of the fixed part 1221 more stable and improving the stability of the overall structure of the one-way valve 12.

[0166] The extrusion surface 12a can have a variety of structural designs, such as an annular curved surface or an inclined plane, as long as it can gradually increase the contact force against the inner wall of the fixed portion 1221 during the process of the valve core 121 driving the sealing portion 1222 to deform. Furthermore, the driving direction refers to the direction in which the valve core 121 drives the sealing portion 1222 to deform during the valve opening process, and can also be understood as the direction toward one side of the sealing portion 1222 in the thickness direction X of the end cap 11.

[0167] Specifically, in some embodiments, the valve core 121 includes a first valve core segment 1215, a second valve core segment 1216, and a third valve core segment 1217, with the second valve core segment 1216 connected between the first valve core segment 1215 and the third valve core segment 1217. In this case, the extrusion surface 12a can be a surface of the second valve core segment 1216 facing the valve body 122, or a surface of the first valve core segment 1215 facing the valve body 122, such as a circular curved surface. Of course, the extrusion surface 12a can also be a surface formed jointly by a surface of the second valve core segment 1216 facing the valve body 122 and a surface of the first valve core segment 1215 facing the valve body 122.

[0168] With this design, the structure of the extrusion surface 12a of the valve core 121 is optimized. During the valve opening process, the abutment force of the extrusion surface 12a on the fixed part 1221 gradually increases, causing the fixed part 1221 to deform in a direction away from its own interior, offsetting or partially offsetting the internal collapse deformation, thereby improving the stability of the overall structure of the one-way valve 12.

[0169] Please refer to Figure 17. In one or more embodiments of the present application, the valve core 121 has a reference line 12b extending along the thickness direction X of the end cover 11, and the distance L between the extrusion surface 12a and the reference line 12b gradually increases in the direction opposite to the driving direction.

[0170] The reference line 12 b refers to a line passing through the interior of the valve core 121 and extending along the thickness direction X. It may be the axis of the valve core 121 , or the center line of the valve core 121 ; or other lines within the valve core 121 .

[0171] The distance L between the extrusion surface 12a and the reference line 12b gradually increases in a direction opposite to the driving direction. It can be understood that: the distance L gradually increases from the end of the extrusion surface 12a close to the sealing part 1222 to the end of the extrusion surface 12a away from the sealing part 1222.

[0172] It should be noted that when the distance L gradually increases in a direction opposite to the driving direction, the extrusion surface 12a gradually increases the amount of outward extrusion of the fixing portion 1221 during the deformation of the driving sealing portion 1222, thereby tightening the connection between the fixing portion 1221 and the end cap 11. The extrusion surface L can be designed as an inclined plane or a curved surface that curves outward away from the reference line.

[0173] Specifically in some embodiments, when the extrusion surface 12a is an annular curved surface, the cross-sectional area of ​​the extrusion surface 12a may gradually increase from an end of the extrusion surface 12a close to the sealing portion 1222 to an end of the extrusion surface 12a away from the sealing portion 1222 .

[0174] With this design, the spacing L of the extrusion surfaces 12a is designed to be gradually increased, and the outward extrusion amount of the fixing portion 1221 is gradually increased, so that the connection between the fixing portion 1221 and the end cover 11 is tighter, further improving the stability of the structure.

[0175] Please refer to FIG. 17 . In one or more embodiments of the present application, an abutting protrusion 12 c is provided on the inner wall of the fixing portion 1221 , and the abutting protrusion 12 c abuts against the extrusion surface 12 a .

[0176] The abutting protrusion 12c refers to a structure on the inner wall of the fixing portion 1221 that abuts against the extrusion surface 12a. The shape of the abutting protrusion 12c can be designed in various ways, such as: a circular protrusion structure, a square protrusion, a hemispherical protrusion structure, etc.

[0177] The number of the abutting protrusion 12 c may be one or more. When the number of the abutting protrusion 12 c is more than one, all the abutting protrusions 12 c may be distributed at intervals around the outer circumference of the valve core 121 .

[0178] In addition, providing an abutting protrusion 12c on the inner wall of the fixing portion 1221 can increase the structure inside the fixing portion 1221, reduce the size of the internal space of the fixing portion 1221, enhance the structural strength, reduce the probability of inward collapse due to valve opening, and improve structural stability.

[0179] Specifically in some embodiments, a valve cavity 1225 is defined in the valve body 122 , and an inner wall of the fixing portion 1221 facing the valve cavity 1225 has an abutting protrusion 12 c.

[0180] Such a design introduces the abutting protrusion 12c, which facilitates the abutment between the valve core 121 and the fixing portion 1221; at the same time, the addition of the abutting protrusion 12c is also conducive to enhancing the structural strength and further improving the structural stability.

[0181] Please refer to FIG. 17 . In one or more embodiments of the present application, the abutting protrusion 12 c is annularly arranged along the outer circumference of the valve core 121 .

[0182] In this embodiment, the abutting protrusion 12c has an annular structure and abuts against the extrusion surface 12a, so that the fixing portion 1221 can be subjected to a uniform outward abutting force during the valve opening process.

[0183] When the abutting protrusion 12c is annular, the number of the abutting protrusions 12c can be one or more. When there are multiple abutting protrusions 12c, the abutting protrusions 12c can be spaced apart along the thickness direction X or the driving direction. Furthermore, in the driving direction, the heights of the abutting protrusions 12c protruding from the inner wall of the fixing portion 1221 can be consistent or inconsistent. For example, the heights of the abutting protrusions 12c protruding from the inner wall of the fixing portion 1221 can gradually increase along the driving direction.

[0184] In this design, the abutting protrusion 12c is designed as a circular ring structure, so that the abutment between the abutting protrusion 12c and the extrusion surface 12a is more uniform, thereby making the structure of the valve body 122 more stable during the valve opening process.

[0185] Please refer to FIG. 17 . In one or more embodiments of the present application, the abutting protrusion 12 c is located at an end of the inner wall of the fixing portion 1221 away from the sealing portion 1222 .

[0186] The abutting protrusion 12c is arranged at one end away from the sealing portion 1222, so that the abutting force applied by the extrusion surface 12a to the abutting protrusion 12c will be transmitted to the end of the fixing portion 1221 away from the sealing portion 1222, making it easier for the fixing portion 1221 to abut on the end cover 11.

[0187] Such a design facilitates the abutting protrusion 12 c to be more easily abutted against the end cover 11 by force, so that the fixing portion 1221 can better abut against the end cover 11, thereby improving the stability of the structure.

[0188] Please refer to Figure 17. In one or more embodiments of the present application, the side of the abutting protrusion 12c facing the valve core 121 includes an abutting surface 12d. The abutting surface 12d is constructed as a curved surface that is raised along a circular arc on one side facing the valve core 121.

[0189] The abutting surface 12d is an arc surface, so that when abutting, the contact between the extrusion surface 12a and the abutting surface 12d is a line contact, which facilitates the transmission of the abutting force to the fixing portion 1221. At the same time, when the driving sealing portion 1222 is deformed, the movement friction of the extrusion surface 12a on the abutting surface 12d can be reduced.

[0190] Specifically in some embodiments, one end of the abutting surface 12d is connected to an end surface of the fixing portion 1221 away from the sealing portion 1222 , for example, one end of the abutting surface 12d is tangentially connected to an end surface of the fixing portion 1221 away from the sealing portion 1222 .

[0191] Such a design facilitates the transmission of the abutting force and reduces the probability of the fixing portion 1221 collapsing inwards; at the same time, it can also reduce the movement friction of the extrusion surface 12a on the abutting surface 12d, reducing the wear on the extrusion surface 12a.

[0192] Please refer to Figures 4 to 7 again. In the third aspect, the present application provides an end cover assembly 10, which includes: an end cover 11, which has an injection hole 111 extending through it along its thickness direction X; and a one-way valve 12 like any of the above items, with a valve body 122 assembled in the injection hole 111.

[0193] The end cover assembly 10 provided in this application has the effects brought about by any of the above-mentioned embodiments, so it will not be described in detail here.

[0194] Please refer to Figures 4 to 7 again. In a third aspect, the present application provides an end cover assembly 10, which includes: an end cover 11 and a valve body 122. The end cover 11 is provided with a liquid injection hole 111 along its thickness direction X. The valve body 122 is assembled in the liquid injection hole 111 and includes a fixing portion 1221 and a sealing portion 1222. The fixing portion 1221 is connected to the end cover 11, and the sealing portion 1222 is connected to the fixing portion 1221 and seals with the end cover 11. The valve body 122 is used to define a flow channel for communicating with the outside between the valve core 121. The sealing portion 1222 is configured to deform under the action of an external force and separate from the end cover 11 to form a flow port, and the flow port is connected to the flow channel.

[0195] Referring again to Figures 6 to 8 , the fixing portion 1221 is fixed to the end cap 11. Regardless of whether external forces act on the valve core 121, the fixing portion 1221 remains in a fixed position relative to the end cap 11. The fixing portion 1221 can be located within the injection hole 111 and engage with the wall of the injection hole 111; alternatively, the fixing portion 1221 can be located on the side of the end cap 11 facing away from the interior of the housing 20 and abut against the outer end surface 113 of the end cap 11.

[0196] The sealing portion 1222 is an elastic component, such as a rubber material, which, under the action of an external force, separates from the end cap 11 by deforming, such as by contracting or stretching, to form a flow port. When the external force is removed, the sealing portion 1222 automatically recovers its deformation and re-engages with the end cap 11. It should be noted that when the external force is removed, a certain preload is applied between the sealing portion 1222 and the end cap 11, so that the rebound force of the sealing portion 1222 provides a sealing force, thereby improving the sealing effect on the injection hole 111.

[0197] Exemplarily, the sealing portion 1222 can achieve a sealed fit between the sealing portion 1222 and the end cover 11 by abutting against the hole wall of the liquid injection hole 111. In this embodiment, a flow outlet is formed when the sealing portion 1222 is separated from the hole wall of the liquid injection hole 111; and / or, the sealing portion 1222 can also achieve a sealed fit between the sealing portion 1222 and the end cover 11 by being received in the internal environment of the battery cell 100 and abutting against the inner end surface 112 of the end cover 11. In this embodiment, a flow outlet is formed when the sealing portion 1222 is separated from the inner end surface 112 of the end cover 11.

[0198] It is worth mentioning that the sealing portion 1222 and the fixing portion 1221 of this embodiment can be the sealing portion 1222 and the fixing portion 1221 in any of the above embodiments, respectively, and will not be repeated here. At the same time, when the injection hole 111 is opened, the sealing portion 1222 is deformed by external force and separated from the end cover 11 to form a flow outlet. There are many ways to act on the sealing portion 1222, such as: using the valve core 121 in any of the above embodiments, at least partially fitting the valve core 121 on the sealing portion 1222, and driving the sealing portion 1222 to deform toward the inside of the battery cell 100. The valve core 121 and the sealing portion 1222 can be detachably fitted, so that after the exhaust or injection is completed, the valve core 121 can be removed from the valve body 122. At this time, the end cover assembly 10 in this example does not have a valve core 121.

[0199] With this design, by providing a one-way valve 12 at the injection hole 111 of the end cover 11 , the external impact on the internal environment of the battery cell 100 during the production of the battery 1000 can be effectively reduced, thereby improving the water-proof effect and injection efficiency of the battery cell 100 .

[0200] Please refer to Figure 3 again. In the fourth aspect, the present application provides a battery cell 100, which includes a shell 20 and an end cover assembly 10. One end of the shell 20 has an opening. The end cover 11 of the end cover assembly 10 is covered at the opening of the shell 20, and the flow port is connected between the flow channel and the interior of the shell 20.

[0201] The battery cell 100 provided in this application has the effects brought about by any of the above embodiments, so it will not be described in detail here.

[0202] Please refer to FIG. 2 again. In a fifth aspect, the present application provides a battery 1000 , which includes the battery cell 100 as described in any one of the above embodiments.

[0203] The battery 1000 provided in this application has the effects brought about by any of the above embodiments, so it will not be described in detail here.

[0204] Please refer to FIG. 1 again. In a sixth aspect, the present application provides an electrical device, which includes the battery 1000 as described in the embodiment, and the battery 1000 is used to provide electrical energy to the electrical device.

[0205] The electrical device provided in this application has the effects brought about by any of the above embodiments, so it will not be described in detail here.

[0206] As shown in Figures 3 to 9, according to one or more embodiments of the present application, the present application provides an end cover assembly 10, which includes an end cover 11 and a one-way valve 12. The end cover 11 is provided with an injection hole 111 along its own thickness direction X. The one-way valve 12 includes a valve core 121 and a valve body 122. The valve body 122 is assembled in the injection hole 111 and includes a fixing portion 1221 and a sealing portion 1222. The fixing portion 1221 is connected to the end cover 11, and the sealing portion 1222 is connected to the fixing portion 1221 and seals with the end cover 11. The valve core 121 is at least partially fitted in the valve body 122 and defines a flow channel connected to the outside with the valve body 122; wherein, the valve core 121 can drive the sealing portion 1222 to stretch along the thickness direction X of the end cover 11 under the action of external force to separate from the end cover 11 to form a flow port, and the flow port is connected to the flow channel.

[0207] It can be seen that in the present application, when the valve core 121 is not subject to external force, the sealing portion 1222 is sealed with the end cover 11 and blocks the flow channel and the internal environment of the battery cell 100. In this way, there is no possibility of medium exchange between the outside and the internal environment of the battery cell 100, that is, no exhaust or injection is possible. The internal environment of the battery cell 100 is minimally affected by the outside, and the water barrier effect is good. Therefore, there is no need to evacuate the battery cell 100 in the subsequent injection process, and the injection efficiency is high. When the valve core 121 is subject to external force, the sealing portion 1222 separates from the end cover 11 and forms a flow port, which is connected to the flow channel. Therefore, the water vapor formed by the evaporation of water in the electrode assembly 30 can be discharged to the outside through the flow port and the flow channel to achieve exhaust. In addition, the electrolyte can also flow into the internal environment of the battery cell 100 through the flow channel and the flow port and achieve injection. Therefore, by providing a one-way valve 12 at the injection hole 111 of the end cover 11, the external impact on the internal environment of the battery cell 100 during the production of the battery 1000 can be effectively reduced, thereby improving the water isolation effect and injection efficiency of the battery cell 100.

[0208] The valve core 121 is connected to the sealing portion 1222, and can be driven by an external force to stretch the sealing portion 1222 along the thickness direction X of the end cover 11 until it is separated from the end cover 11 to form a flow outlet. The method of stretching and forming a flow outlet is simple to operate, and is convenient for simplifying the structure of the one-way valve 12, greatly reducing the manufacturing cost of the one-way valve 12. When the external force is removed, the sealing portion 1222 recovers its deformation, and the sealing portion 1222 is sealed with the end cover 11 again. During this process, the residual electrolyte in the valve core 121 flows into the internal environment of the battery cell 100 through the flow channel, which helps to reduce the impact of crystallization or moisture absorption of the electrolyte in the valve core 121 on the performance of the battery cell 100.

[0209] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0210] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A one-way valve for sealing or opening a liquid injection hole (111) of an end cover (11), the one-way valve comprising: Valve core (121); a valve body (122) mounted in the injection hole (111) and comprising a fixing portion (1221) and a sealing portion (1222); the fixing portion (1221) is connected to the end cover (11); the sealing portion (1222) is connected to the fixing portion (1221) and is in sealing cooperation with the end cover (11); the valve core (121) is at least partially mounted in the valve body (122) and defines a flow passage communicating with the outside with the valve body (122); Wherein, the valve core (121) can drive the sealing portion (1222) to deform and separate from the end cover (11) under the action of an external force to form a flow port, and the flow port is connected to the flow channel.

2. The one-way valve according to claim 1, wherein: The valve core (121) is connected to the sealing portion (1222), and can, under the action of an external force, drive the sealing portion (1222) to stretch along the thickness direction (X) of the end cover (11) until it is separated from the end cover (11) to form the flow port.

3. The one-way valve according to claim 2, wherein: The sealing portion (1222) and the fixing portion (1221) are both elastic structures and are integrally arranged.

4. The one-way valve according to any one of claims 1 to 3, wherein: The sealing portion (1222) comprises a connecting section (12221) and a sealing section (12222), wherein the connecting section (12221) is connected between the fixing portion (1221) and the sealing section (12222); The fixing portion (1221) and the sealing section (12222) are both in sealing cooperation with the end cover (11).

5. The one-way valve according to claim 4, wherein: The surfaces of the fixing portion (1221), the connecting section (12221) and the sealing section (12222) facing away from the valve core (121) are arranged to form a bayonet (123), and the end cover (11) is held in the bayonet (123).

6. The one-way valve according to any one of claims 1 to 5, wherein: The valve core (121) and the valve body (122) define a plurality of flow passages, and openings of the flow passages communicating with the flow port are arranged at intervals along the circumference of the valve body (122).

7. The one-way valve according to any one of claims 1 to 6, wherein: A valve cavity (1225) is provided in the valve body (122), and a valve port (1223) and a flow guide port (1224) are provided on the valve body (122), both of which are connected to the valve cavity (1225); the valve core (121) is at least partially arranged in the valve cavity (1225), and is surrounded by the cavity wall of the valve cavity (1225) to form a flow cavity (1226); the valve port (1223), the flow cavity (1226) and the flow guide port (1224) are connected in sequence to form a flow channel.

8. The one-way valve according to any one of claims 1 to 6, wherein: A valve cavity (1225) is provided in the valve body (122), and a valve port (1223) and a flow guide port (1224) are provided on the valve body (122), both of which are connected to the valve cavity (1225); the valve core (121) is at least partially installed in the valve cavity (1225), and a flow channel structure (1214) is provided in the valve core (121), and the flow channel is formed when the flow channel structure (1214) is connected to the flow guide port (1224).

9. The one-way valve according to claim 8, wherein: A valve core cavity (1213) is provided in the valve core (121), and a flow channel opening (1212) and a valve core opening (1211) are provided on the valve core (121), both of which are connected to the valve core cavity (1213); the valve core opening (1211), the valve core cavity (1213) and the flow channel opening (1212) are connected in sequence and are constructed to form the flow channel structure (1214).

10. The one-way valve according to claim 9, wherein: The valve core (121) comprises a first valve core section (1215), a second valve core section (1216) and a third valve core section (1217), wherein the second valve core section (1216) is connected between the first valve core section (1215) and the third valve core section (1217); The second valve core section (1216) includes at least two, which are intersectingly arranged in the valve core cavity (1213) and divide the valve core cavity (1213) into a plurality of valve core sub-cavities (1213a), and the valve core port (1211) is connected to the valve core sub-cavity (1213a) to form the flow channel structure (1214).

11. The one-way valve according to claim 9, wherein: The valve core (121) comprises a first valve core section (1215), a second valve core section (1216) and a third valve core section (1217), wherein the second valve core section (1216) is connected between the first valve core section (1215) and the third valve core section (1217); The second valve core segments (1216) include at least two and are arranged at intervals along the circumference of the valve core (121).

12. The one-way valve according to any one of claims 1 to 11, wherein: The outer surface of the valve core (121) includes an extrusion surface (12a), and the extrusion surface (12a) abuts against at least part of the inner wall of the fixed portion (1221), and the extrusion surface (12a) is configured to gradually increase the abutment force on the inner wall of the fixed portion (1221) when the valve core (121) moves along the driving direction of the sealing portion (1222).

13. The one-way valve according to claim 12, wherein: The valve core (121) has a reference line (12b) extending along the thickness direction (X) of the end cover (11), and the distance (L) between the extrusion surface (12a) and the reference line (12b) gradually increases in a direction opposite to the driving direction.

14. The one-way valve according to claim 12 or 13, wherein: An abutting convex portion (12c) is provided on the inner wall of the fixing portion (1221), and the abutting convex portion (12c) abuts against the extrusion surface (12a).

15. The one-way valve according to claim 14, wherein: The abutting protrusion (12c) is arranged in an annular shape along the outer circumference of the valve core (121).

16. The one-way valve according to claim 14 or 15, wherein: The abutting protrusion (12c) is located at an end of the inner wall of the fixing portion (1221) away from the sealing portion (1222).

17. The one-way valve according to any one of claims 14 to 16, wherein: The side surface of the abutting protrusion (12c) facing the valve core (121) comprises an abutting surface (12d), and the abutting surface (12d) is constructed as a curved surface that is raised along a circular arc on one side facing the valve core (121).

18. An end cap assembly, comprising: The end cover (11) is provided with a liquid injection hole (111) extending through the end cover along its thickness direction (X); According to any one of claims 1 to 17, the valve body (122) is assembled in the liquid injection hole (111).

19. An end cap assembly, comprising: The end cover (11) is provided with a liquid injection hole (111) extending through the end cover along its thickness direction (X); a valve body (122), which is assembled in the injection hole (111) and comprises a fixing portion (1221) and a sealing portion (1222), wherein the fixing portion (1221) is connected to the end cover (11), and the sealing portion (1222) is connected to the fixing portion (1221) and is in sealing cooperation with the end cover (11), and the valve body (122) is used to define a flow passage for communicating with the outside with the valve core (121); The sealing portion (1222) is configured to deform under the action of an external force and separate from the end cover (11) to form a flow opening, and the flow opening is connected to the flow channel.

20. A battery cell, comprising: A housing (20) having an opening at one end; as well as As described in the end cover assembly of claim 18 or 19, the end cover (11) is arranged at the opening of the shell (20), and the flow port is connected between the flow channel and the interior of the shell (20).

21. A battery comprising the battery cell according to claim 20.

22. An electrical device, comprising the battery as claimed in claim 21, wherein the battery is used to provide electrical energy for the electrical device.

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