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

Abstract

The invention relates to a one-way valve, an end cover assembly, a battery monomer, a battery and an electric device. The one-way valve comprises a valve element and a valve body. The valve body is assembled in the liquid injection hole and comprises a fixing part and a sealing part, the fixing part is connected with the end cover, the sealing part is connected with the fixing part and is in sealing fit with the end cover, at least part of the valve element is connected in the valve body in a matched mode, and the valve element and the valve body define an overflowing channel communicated with the outside; the valve element can drive the sealing part to deform under the action of external force, the sealing part is separated from the end cover, a flow passing opening is formed, and the flow passing opening communicates with the flow passing channel. The end cover assembly, the battery monomer, the battery and the electric device provided by the invention are poor in waterproof effect and high in liquid injection efficiency.

Description

[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. Technical Field

[0003] 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

[0004] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0005] The battery consists of battery cells, which go through exhaust and injection processes in sequence during manufacturing. During the process of switching from the exhaust process to the injection process, the injection hole on the end cover of the battery cell remains open, resulting in a series of problems such as poor water isolation and low injection efficiency in the battery cell, which greatly limits the battery's production capacity. Summary of the invention

[0006] 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 injection efficiency in battery cell manufacturing, thereby improving the production capacity of the end cover assembly, the battery cell, the battery and the electrical device.

[0007] In a first aspect, the present application provides a one-way valve, the one-way valve comprising: a valve core and a valve body; the valve body is assembled in a liquid injection hole and comprises a fixing portion and a sealing portion, the fixing portion is connected to an end cover, the sealing portion is connected to the fixing portion and is sealed with the end cover, the valve core is at least partially matched in the valve body and defines a flow passage communicating with the outside with the valve body;

[0008] Wherein, the valve core can drive the sealing part 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 with the flow channel.

[0009] In the present application, when the valve core is not subject to external force, the sealing part cooperates with the end cover seal and blocks 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 injection is impossible. The internal environment of the battery cell is minimally affected by the outside, and the water-proof effect is good. In the subsequent injection process, there is no need to evacuate the battery cell, and the injection efficiency is high. When the valve core is subjected to external force, the sealing part 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 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-proof effect and injection efficiency of the battery cell can be improved.

[0010] 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.

[0011] By setting the valve core to be connected with the sealing part, the sealing part can be stretched along the thickness direction of the end cover to separate from the end cover to form a flow port under the action of external force. The method of stretching and forming the flow port is simple to operate, and it is convenient to simplify the structure of the one-way valve, which greatly reduces the manufacturing cost of the one-way valve. When the external force is removed, the sealing part restores its deformation and the sealing part re-seals with the end cover. In this process, the residual electrolyte in the valve core flows into the internal environment of the battery cell through the flow channel, which helps to reduce the crystallization or moisture absorption of the electrolyte in the valve core that affects the performance of the battery cell.

[0012] In some embodiments, the sealing portion and the fixing portion are both elastic structures and are integrally arranged.

[0013] The sealing part and the fixing part 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.

[0014] In some embodiments, the sealing portion includes a connecting section and a sealing section, and the connecting section is connected between the fixing portion and the sealing section;

[0015] The fixing portion and the sealing section are both in sealing cooperation with the end cover.

[0016] 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, the water-proof effect is good, the injection efficiency is high, and the risk of electrolyte leakage is low.

[0017] 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.

[0018] By providing the bayonet, the end cover and the valve body are easy to assemble and fit tightly, which helps to improve the sealing performance between the valve body and the end cover.

[0019] 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.

[0020] With multiple current channels, battery cells can be quickly vented or filled with liquid, further improving production efficiency.

[0021] In some embodiments, a valve cavity is opened in the valve body, and a valve port and a flow guide port both connected to the valve cavity are opened 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.

[0022] 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 driven by an external force to deform the sealing portion and separate from the end cover to form a flow port, the flow passage is directly connected to the flow port to facilitate subsequent exhaust and liquid injection.

[0023] In some embodiments, a valve cavity is opened in the valve body, and a valve port and a flow guide port both connected to the valve cavity are opened 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 flow guide port.

[0024] 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, and the one-way valve itself has high sealing performance and excellent sealing performance.

[0025] In some embodiments, a valve core cavity is opened in the valve core, and a flow channel opening and a valve core opening which are both connected to the valve core cavity are opened on the valve core; 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.

[0026] In this embodiment, the flow channel structure is independently arranged in the valve core, and only a flow guide port is provided on the valve body, so that the flow channel structure can form a flow passage when connected with the flow guide port. This arrangement is conducive to simplifying the structure of the valve body and the valve core, and reducing the manufacturing cost of the one-way valve.

[0027] 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;

[0028] The second valve core section includes at least two, which are intersectingly arranged in the valve core cavity and divide the valve core cavity into a plurality of valve core sub-cavities, and the valve core port is connected with the valve core sub-cavities to form a flow channel structure.

[0029] 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 is convenient for forming the flow channel structure.

[0030] 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;

[0031] The second valve core segments include at least two and are spaced apart along the circumference of the valve core.

[0032] This design is convenient for simplifying the valve core structure and reducing the manufacturing cost of the one-way valve.

[0033] In some embodiments, the outer surface of the valve core includes an extrusion surface, which abuts against at least part of the inner wall of the fixed portion, and the extrusion surface is configured to gradually increase the abutment force on the inner wall of the fixed portion when the valve core moves along the driving direction of the sealing portion. With such a design, the structure of the extrusion surface of the valve core is optimized, and during the valve opening process, the abutment force of the extrusion surface on the fixed portion gradually increases, causing the fixed portion to deform in a direction away from its interior, offsetting or partially offsetting the collapse deformation toward the interior, thereby improving the stability of the overall structure of the one-way valve.

[0034] In some embodiments, the valve core has a reference line extending in the thickness direction of the end cap, and the distance between the extrusion surface and the reference line gradually increases in the direction opposite to the driving direction. In this way, the distance between the extrusion surfaces is designed to be a gradually increasing structure, and the amount of extrusion of the fixing part outward gradually increases, so that the fixing part and the end cap are more tightly combined, further improving the stability of the structure.

[0035] In some embodiments, an abutting convex portion is provided on the inner wall of the fixing portion, and the abutting convex portion abuts against the extrusion surface. In this design, the introduction of the abutting convex portion facilitates the abutment between the valve core and the fixing portion; at the same time, the addition of the abutting convex portion is also conducive to enhancing the structural strength and further improving the structural stability.

[0036] In some embodiments, the abutting protrusion is arranged in an annular shape 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 in the valve opening process.

[0037] In some embodiments, the abutting protrusion is located at an end of the inner wall of the fixing part away from the sealing part. Such a design facilitates the abutting protrusion to be more easily abutted against the end cover by force, so that the fixing part is better abutted against the end cover, and the stability of the structure is improved.

[0038] In some embodiments, the side of the abutting protrusion facing the valve core includes an abutting surface, which is constructed as a curved surface that is raised along a circular arc on one side facing the valve core. Such a design facilitates the transmission of the abutting force and reduces the probability of the fixing portion collapsing inwards; at the same time, it can also reduce the movement friction of the extrusion surface on the abutting surface and reduce the wear on the extrusion surface.

[0039] In a second aspect, the present application provides an end cover assembly, which includes: an end cover and a one-way valve thereon, wherein the end cover is provided with an injection hole extending through the end cover along its thickness direction; and the valve body is assembled in the injection hole.

[0040] In a third aspect, the present application provides an end cap assembly, the end cap assembly comprising:

[0041] The end cover is provided with a liquid injection hole along the thickness direction thereof;

[0042] The valve body is assembled in the injection hole and includes a fixing part and a sealing part. The fixing part is connected to the end cover. The sealing part is connected to the fixing part and is sealed with the end cover. The valve body is used to define a flow passage for communicating with the outside between the valve body and the valve core.

[0043] 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, and the flow port is connected to the flow channel.

[0044] Such a design, by providing a one-way valve at the injection hole of the end cover, can effectively reduce the external impact on the internal environment of the battery cell during the battery production process, and improve the water isolation effect and injection efficiency of the battery cell.

[0045] In a fourth aspect, the present application provides a battery cell, comprising:

[0046] a housing having an opening at one end; and

[0047] 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.

[0048] In a fifth aspect, the present application provides a battery, comprising a battery cell as described in any one of the above embodiments.

[0049] In a sixth aspect, the present application provides an electrical device, comprising a battery as described in any one of the above embodiments, and the battery is used to provide electrical energy to the electrical device.

[0050] 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

[0051] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0052] Figure 1 This is a schematic diagram of the structure of a vehicle in some embodiments of the present application.

[0053] Figure 2 This is an exploded view of a battery in some embodiments of the present application.

[0054] Figure 3 This is a schematic diagram of the structure of a battery cell in some embodiments of the present application.

[0055] Figure 4 This is a schematic diagram of the structure of the end cover assembly in some embodiments of the present application.

[0056] Figure 5 It is a schematic diagram of the structure of the end cover assembly in other embodiments of the present application.

[0057] Figure 6 for Figure 4 The end cap assembly is shown in cross-section along the AA direction.

[0058] Figure 7 for Figure 5 The end cap assembly is shown in a cross-sectional view along direction BB.

[0059] Figure 8 This is a schematic diagram of the structure of a one-way valve in an end cover assembly in some further embodiments of the present application.

[0060] Fig. 9 for Figure 8 The cross-sectional view of the one-way valve along the CC direction is shown.

[0061] Fig.10 for Figure 8 A top view of the one-way valve is shown.

[0062] Fig.11 for Figure 4 A schematic diagram of the structure of the one-way valve in the end cover assembly is shown.

[0063] Fig.12 for Fig.11 Exploded view of a check valve is shown.

[0064] Fig.13 for Fig.12 A schematic diagram of the structure of the valve core in the one-way valve shown.

[0065] Fig.14 for Figure 5 Exploded view of the check valve in the end cap assembly shown.

[0066] Fig.15 for Fig.14 The structural schematic diagram of the one-way valve is shown.

[0067] Fig.16 Schematic diagram of the structure of the one-way valve in the end cover assembly in some other embodiments of the present application.

[0068] Fig.17 for Fig.16 A cross-sectional view of a check valve is shown.

[0069] Figure Number:

[0070] 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 convexity; 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. Flow 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

[0071] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0072] 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 referred device or element 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.

[0073] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0074] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0075] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature 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. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0076] 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 a central 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 a central element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only implementation method.

[0077] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0078] The battery consists of battery cells, which go through exhaust and injection processes in sequence during manufacturing. During the process of switching from the exhaust process to the injection process, the injection hole on the end cover of the battery cell remains open, resulting in a series of problems such as poor water isolation and low injection efficiency in the battery cell, which greatly limits the battery's production capacity.

[0079] Specifically, since the electrolyte cannot contact water, before the battery cell is transported to the injection station for injection (electrolyte injection), the battery cell should be vented at the exhaust station first. Exhaust refers to placing the battery cell in a high temperature and vacuum environment for baking, so that the moisture of the electrode assembly contained in the internal environment of the battery cell can evaporate and be discharged to the outside of the battery cell through the injection hole on the end cover of the battery cell. During the entire exhaust process, the injection hole is always open, which improves the reliability of exhaust. After the exhaust is completed, the battery cell is transported from the exhaust station to the injection station. During this process, the injection hole is still open, resulting in poor water isolation effect of the battery cell, and water vapor in the environment can easily enter the battery cell through the injection hole, affecting the normal use of the subsequent injected electrolyte. Therefore, when the battery cell is transported to the injection station, it is necessary to evacuate the inside of the battery cell again, and then perform the injection operation. The time required for vacuuming is long, which greatly prolongs the time the battery cell stays in the injection station, and the injection efficiency is reduced.

[0080] In order to alleviate the problems of poor water isolation effect 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, and 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.

[0081] When the valve core is not subject to external force, the sealing part and the end cover seal cooperate 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, and the water-proof effect is good. Therefore, there is no need to evacuate the internal environment of the battery cell in the subsequent injection process, and the injection efficiency is high. When the valve core is subject to external force and drives the sealing part to deform, the sealing part 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, while the electrolyte can flow into the battery cell through the flow channel and the flow port to achieve injection.

[0082] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of vehicle 10000 in some embodiments of the present application.

[0083] The embodiment of the present application provides an electric device using a battery 1000 as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0084] 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.

[0085] 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 be used as an operating power source for the vehicle 10000. The vehicle 10000 may also 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.

[0086] In some embodiments of the present application, the battery 1000 can not only serve as an operating power source for the vehicle 10000, but also serve 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.

[0087] Please refer to Figure 2 , Figure 2 1 is an exploded view of a battery 1000 in some embodiments of the present application.

[0088] The battery 1000 includes a box body 200 and a battery cell 100, and the battery cell 100 is accommodated in the box body 200. The box body 200 is used to provide a storage cavity for the battery cell 100, and the box body 200 can adopt a variety of structures. In some embodiments, the box body 200 may include a first part 201 and a second part 202, and the first part 201 and the second part 202 cover each other, and the first part 201 and the second part 202 jointly define a storage cavity for accommodating the battery cell 100. The second part 202 may be a hollow structure with one end open, and the first part 201 may be a plate-like structure, and the first part 201 covers the open side of the second part 202, so that the first part 201 and the second part 202 jointly define a storage cavity; the first part 201 and the second part 202 may also be hollow structures with one side open, and the open side of the first part 201 covers the open side of the second part 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.

[0089] 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 mixed connection. A mixed connection means that the multiple battery cells 100 are both connected in series and in parallel. The multiple battery cells 100 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 100 is accommodated in the box 200; of course, the battery 1000 may also be a battery module formed by connecting multiple battery cells 100 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 200. The battery 1000 may also include other structures, for example, the battery 1000 may also include a busbar component for realizing electrical connection between the multiple battery cells 100.

[0090] 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.

[0091] Please refer to Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7 , Figure 3 This is a schematic diagram of the structure of a battery cell 100 in some embodiments of the present application. Figure 4 This is a schematic diagram of the structure of the end cover assembly 10 in some embodiments of the present application. Figure 5 This is a schematic diagram of the structure of the end cover assembly 10 in some other embodiments of the present application. Figure 6 for Figure 4The cross-sectional view of the end cap assembly 10 along the AA direction is shown. Figure 7 for Figure 5 The end cap assembly 10 is shown in a cross-sectional view along the BB direction.

[0092] The battery cell 100 refers to 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.

[0093] 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 positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The parts of the positive and negative electrode sheets with active materials constitute the main body of the electrode assembly 30, and the parts of the positive and negative electrode sheets without active materials each constitute a pole ear (not shown in the figure). The positive pole ear and the negative pole ear 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 active material and the negative active material react with the electrolyte, and the pole ears connect the electrode terminals to form a current loop.

[0094] The shell 20 is a component used to cooperate with the end cap 11 in the end cap assembly 10 to form the internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate the electrode assembly 30, the electrolyte (not shown in the figure) and other components. The shell 20 and the end cap 11 can be independent components, and an opening can be set on the shell 20, and the internal environment of the battery cell 100 is formed by covering the opening with the end cap 11 at the opening. Without limitation, the end cap 11 and the shell 20 can also be integrated. Specifically, the end cap 11 and the shell 20 can form a common connection surface before other components are put into the shell, and when the interior of the shell 20 needs to be encapsulated, the end cap 11 covers the shell 20. The shell 20 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 20 can be determined according to the specific shape and size of the electrode assembly 30. The material of the shell 20 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0095] The end cap assembly 10 includes an end cap 11, which refers to a component that covers the opening of the shell 20 to isolate the internal environment of the battery cell 100 from the outside. Without limitation, the shape of the end cap 11 can be adapted to the shape of the shell 20 to match the shell 20. Optionally, the end cap 11 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 11 is not easy to deform when it is squeezed and collided, so that the battery cell 100 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals can be provided on the end cap 11. The electrode terminal can be used to electrically connect to the electrode assembly 30 for outputting or inputting electrical energy of the battery cell 100. In some embodiments, the end cap 11 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold. In some embodiments, an insulating member can also be provided on the inner side of the end cap 11, and the insulating member can be used to isolate the electrical connection components in the shell 20 from the end cap 11 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0096] Please refer again Figures 4 to 7 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 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, the sealing portion 1222 is connected to the fixing portion 1221 and is sealed with the end cover 11, the valve core 121 is at least partially equipped 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 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 passage.

[0097] Please also read Figure 3 , and also see Figure 8 , Figure 8 It 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.

[0098] It is worth mentioning that the internal environment of the battery cell 100 is defined by the end cap 11 and the shell 20. The injection hole 111 of the end cap 11 is formed by the end cap 11 itself. The injection hole 111 and the internal environment of the battery cell 100 are not the same or equivalent. The end cap 11 has an outer end face 113 and an inner end face 112 that are arranged opposite to each other along the thickness direction X. The inner end face 112 and the inner wall of the shell 20 are arranged to form the internal environment of the battery cell 100. The outer end face 113 is arranged to face away from the internal environment of the battery cell 100. The injection hole 111 on the end cap 11 passes through the outer end face 113 and the inner end face 112 in sequence.

[0099] The valve body 122 and the valve core 121 can be formed separately or integrally. Figure 6 and Figure 7 For example, the valve body 122 and the valve core 121 are formed separately. Figure 8 For example, the valve body 122 and the valve core 121 are integrally formed.

[0100] Please refer again Figures 6 to 8 The fixing portion 1221 is fixed to the end cover 11, and the fixing portion 1221 always remains in a position relative to the end cover 11 regardless of whether an external force acts on the valve core 121. The fixing portion 1221 may be located in the injection hole 111 and clamped with the hole wall of the injection hole 111; or the fixing portion 1221 may be located on the side of the end cover 11 facing away from the inside of the housing 20 and abut against the outer end surface 113 of the end cover 11.

[0101] The sealing part 1222 is an elastic component, which is separated from the end cover 11 by deformation such as contraction and elongation under the action of external force to form a flow port. When the external force is removed, the sealing part 1222 automatically restores its deformation and seals with the end cover 11 again.

[0102] 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 injection hole 111. In this embodiment, a flow outlet is formed when the sealing portion 1222 is separated from the hole wall of the 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.

[0103] In actual production, the one-way valve 12, the end cover 11, the shell 20 and the electrode assembly 30 are pre-packaged to form a battery cell 100. During exhaust, the battery cell 100 is located at the exhaust station and placed in a high temperature and vacuum environment, and the valve core 121 is pressed by a porous plate. The opening of the flow channel away from the flow port is connected to the outside through the pore structure on the porous plate. Under the gravity of the porous plate, the valve core 121 sinks and drives the sealing part 1222 to deform and separate from the end cover 11 to form a flow port. In this way, the moisture in the electrode assembly 30 is evaporated by heat and flows through the flow port, the flow channel and the pore structure of the porous plate in turn to be discharged to the outside. After the exhaust is completed, the porous plate is raised and the effect of the porous plate on the valve core 121 is cancelled. Since the sealing part 1222 has been deformed when it is separated from the end cover 11, when the effect of the porous plate on the valve core 121 is cancelled, the sealing part 1222 will rebound and seal with the end cover 11 again. At this time, the flow port is closed again, and the external environment is isolated from the internal environment of the battery cell 100, which greatly reduces the medium exchange between the external environment and the internal environment of the battery cell 100, so that a high vacuum degree can still be maintained in the battery cell 100.

[0104] It can be 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.

[0105] After that, the battery cell 100 is transported to the liquid injection station for liquid injection. During the process of transporting the battery cell 100 from the exhaust station to the liquid injection station, since the flow passage in the one-way valve 12 is always separated from the internal environment of the battery cell 100, the battery cell 100 still has a high vacuum degree. Therefore, when the battery 1000 is transported to the liquid injection station, it is no longer necessary to evacuate the battery cell 100.

[0106] When injecting liquid, the injection rubber sleeve of the injection nozzle presses down the valve core 121, and the valve core 121 sinks again, and drives the sealing part 1222 to separate from the end cover 11 and form a flow port. In this way, the electrolyte flowing out of the injection nozzle flows into the battery cell 100 through the flow channel and the flow port in sequence. After the injection is completed, the injection nozzle is removed. At this time, when the pressure of the injection nozzle on the valve core 121 disappears, the sealing part 1222 and the end cover 11 are re-sealed to isolate the internal environment of the battery cell 100 from the outside of the battery cell 100, so that the electrolyte can be sealed in the battery cell 100 and undergo chemical reactions.

[0107] It is worth mentioning that in order to reduce the risk of electrolyte leakage, during the injection process, the injection rubber 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 rubber sleeve of the injection nozzle and the fixed part 1221.

[0108] 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 .

[0109] It can be seen that in the present application, when the valve core 121 is not subjected to external force, the sealing portion 1222 seals with the end cover 11 and blocks the flow channel and the internal environment of the battery cell 100. In this way, the medium cannot be exchanged between the outside and the internal environment of the battery cell 100, that is, exhaust or injection is impossible. The internal environment of the battery cell 100 is minimally affected by the outside, and the water-proof effect is good. Therefore, in the subsequent injection process, there is no need to evacuate the battery cell 100, and the injection efficiency is high. When the valve core 121 is subjected 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.

[0110] 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 process of the battery 1000 can be effectively reduced, thereby improving the water isolation effect and injection efficiency of the battery cell 100 .

[0111] See also Figures 6 to 9 , Fig. 9 This is a cross-sectional view of the one-way valve 12 along the CC direction in the third embodiment of the present application.

[0112] 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 an external force to separate from the end cover 11 to form a flow port.

[0113] Specifically, at least the sealing portion 1222 is an elastic component, and under the action of external force, the valve core 121 drives the sealing portion 1222 to stretch along the thickness direction X of the end cover 11, so that more of the sealing portion 1222 extends into the internal environment of the battery cell 100. Furthermore, the sealing portion 1222 is separated from the inner end surface 112 of the end cover 11 and / or the hole wall of the injection hole 111 to form a flow port.

[0114] The valve core 121 is connected to the sealing portion 1222, and the sealing portion 1222 can be stretched along the thickness direction X of the end cover 11 under the action of external force until it is separated from the end cover 11 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 portion 1222 restores its deformation, and the sealing portion 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 that affects the performance of the battery cell 100.

[0115] 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.

[0116] In this way, the sealing portion 1222 and the fixing portion 1221 form an elastic valve body 122 .

[0117] The sealing portion 1222 and the fixing portion 1221 are designed to be elastic components and are integrally provided, which is beneficial to simplifying the structure of the valve body 122 and greatly reducing the manufacturing cost of the one-way valve 12 .

[0118] 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 ; the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11 .

[0119] The sealing portion 1222 includes a connecting section 12221 and a sealing section 12222. The connecting section 12221 is located in the 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. Figure 6 The sealing section 12222 is located outside the injection hole 111 and is received in the internal environment of the battery 1000, and the sealing section 12222 presses against the inner end surface 112 of the end cover 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 cover 11 along the thickness direction X of the end cover 11, and separate from the inner end surface 112 of the end cover 11 to form a flow port. In some embodiments, please refer to Figure 7 and Fig. 9, the sealing section 12222 is at least partially located in the injection hole 111 and abuts against the hole wall of the injection hole 111 to achieve sealing. In this embodiment, when an external force acts, the valve core 121 drives the connecting section 12221 to stretch, so that the sealing section 12222 can move relative to the end cover 11 along the thickness direction X of the end cover 11, and separate from the hole wall of the injection hole 111 to form a flow port.

[0120] Specifically, after the one-way valve 12 is assembled, the battery cell 100 is always sealed with the end cap 11, and the sealing section 12222 is selectively sealed with or disconnected from the end cap 11. In addition, it is worth mentioning that when the fixing portion 1221 and the sealing section 12222 are both sealed with the end cap 11, the valve core 121 and the fixing portion 1221 can also be sealed or spaced apart. Figure 6 and Figure 7 For example, when the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the valve core 121 is also sealed with the fixing portion 1221. 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 is spaced apart from the fixing portion 1221.

[0121] The fixing portion 1221 and the end cover 11 can be sealed by means of bevel sealing and / or plane sealing. Bevel sealing means that the surfaces that are sealed between the fixing portion 1221 and the end cover 11 are all inclined surfaces. The inclined surface refers to a surface structure that is inclined relative to the thickness direction X of the end cover 11. Plane sealing means that the surfaces that are sealed between the fixing portion 1221 and the end cover 11 are all planes. The plane refers to a surface structure that is perpendicular to the thickness direction X of the end cover 11. Similarly, the sealing section 12222 and the end cover 11 can also be sealed by means of bevel sealing and / or plane sealing.

[0122] In some embodiments, Figure 6 For example, the surface of the fixing portion 1221 facing the end cover 11 includes a first sealing area 12211 and a second sealing area 12212. The first sealing area 12211 is arranged around the periphery of the second sealing area 12212, and is arranged and connected along the thickness direction X of the end cover 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 plane-sealed with the outer end surface 113 of the end cover 11, and the second sealing area 12212 is plane-sealed with the inclined surface of the hole wall of the injection hole 111. The sealing section 12222 is located in the accommodating cavity, and the surface of the sealing section 12222 facing the end cover 11 is plane-sealed with the inner end surface 112 of the end cover 11.

[0123] In this embodiment, when exhausting or injecting liquid, the valve core 121 sinks and drives the sealing section 12222 to drive the connecting section 12221 to stretch, and the sealing section 12222 sinks and separates from the inner end surface 112 of the end cover 11 to form a flow port. After exhausting or injecting liquid, the connecting section 12221 recovers its deformation, and the sealing section 12222 is sealed with the inner end surface 112 of the end cover 11 again.

[0124] In some embodiments, Figure 7 For example, in Figure 2 In the embodiment, the surface of the fixing portion 1221 facing the end cover 11 only includes the second sealing area 12212, and the second sealing area 12212 is sealed with the inclined surface of the hole wall of the injection hole 111. Figure 8 For example, Figure 8 The sealing method of the fixing part 1221 and the end cover 11 is the same as Figure 1 The sealing method of the fixing portion 1221 is the same as that of the end cover 11, so it will not be repeated here.

[0125] exist Figure 7 and Figure 8 In the embodiment, the sealing section 12222 is sealed with the inclined surface of the hole wall of the injection hole 111. When exhausting or injecting liquid, the valve core 121 sinks and drives the sealing section 12222 to drive the connecting section 12221 to stretch, and the sealing section 12222 is separated from the hole wall of the injection hole 111 to form a flow port. After exhausting or injecting liquid, the connecting section 12221 recovers its deformation, and the sealing section 12222 is sealed with the inclined surface of the hole wall of the injection hole 111 again.

[0126] 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, a high injection efficiency, and a low risk of electrolyte leakage.

[0127] Please refer again Figure 6 and Figure 7 In one or more embodiments of the present application, the surfaces of the fixing portion 1221 , the connecting section 12221 and the sealing section 12222 facing away from the valve core 121 are surrounded to form a bayonet 123 , and the end cover 11 is held in the bayonet 123 .

[0128] By providing the bayonet 123 , the end cover 11 and the valve body 122 are easily assembled and tightly matched, which helps to improve the sealing performance between the valve body 122 and the end cover 11 .

[0129] In one or more embodiments of the present application, 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 ports are arranged at intervals along the circumference of the valve body 122 .

[0130] Among them, each flow channel can be set independently of each other, or there can be some overlap, which is not specifically limited here.

[0131] By providing a plurality of flow passages, the battery cell 100 can be quickly vented or filled with liquid, and the production efficiency is further improved.

[0132] Please refer again Figure 8 , and also see Fig. 9 and Fig.10 . Fig.10 This is a top view of the one-way valve in the third embodiment of the present application.

[0133] In one or more embodiments of the present application, a valve cavity 1225 is defined in the valve body 122, and a valve port 1223 and a flow guide port 1224 both connected to the valve cavity 1225 are defined on the valve body 122; the valve core 121 is at least partially disposed 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.

[0134] Specifically, the valve core 121 may be partially located in the valve cavity 1225, and the remaining portion may extend out of the valve port 1223, or the valve core 121 may be completely located in the valve cavity 1225. To improve the reliability of the valve core 121 drive, the remaining portion of the valve core 121 is extended out of the valve port 1223, so that during the exhaust process, the porous plate may drive the valve core 121 to sink relative to the valve body 122, and during the injection process, the injection nozzle may also drive the valve core 121 to sink relative to the valve body 122.

[0135] The fixing portion 1221 is annular, and a valve port 1223 is formed on an end surface of the fixing portion 1221 away from the sealing section 1222. The fixing portion 1221 and the sealing portion 1222 are surrounded to form a valve cavity 1225, and the guide port 1224 is disposed on the sealing portion 1222.

[0136] In some embodiments, the valve core 121 may only include a valve core body 1218, the valve core body 1218 is disposed in the valve cavity 1225, and a flow cavity 1226 is formed between the outer wall of the valve core body 1218 and the cavity wall of the valve cavity 1225. In some embodiments, the valve core 121 may include a plurality of valve core branches 1219 in addition to the valve core body 1218, all of which are arranged at intervals along the circumference of the valve core body 1218, and separate the flow cavity 1226 into a plurality of flow sub-cavities 1227. Specifically, the valve core body 1218 and each of the two adjacent valve core branches 1219 together form a flow sub-cavity 1227.

[0137] The sealing portion 1222 includes a connecting section 12221 and a sealing section 12222. In some embodiments, the connecting section 12221 may be a continuous annular structure, on which one or a plurality of guide ports 1224 are provided at intervals along the circumference of the valve body 122. In some embodiments, the connecting section 12221 is multiple and is provided at intervals along the circumference of the valve body 122, and a guide port 1224 is defined between each two adjacent connecting sections 12221. Each connecting section 12221 may extend along the thickness direction X of the end cover 11 or extend along the radial direction of the injection hole 111.

[0138] The number of the guide ports 1224 may be one or more, and may be specifically set according to needs.

[0139] 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 passage. In this embodiment, the one-way valve 12 has only one flow passage.

[0140] 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 that 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.

[0141] Taking the case where the flow chamber 1226 is divided into flow sub-chambers 1227, and the flow guide port 1224 is one and extends along the circumference of the valve body 122 as an example, the valve port 1223, each flow sub-chamber 1227 and the flow guide port 1224 are connected in sequence to form a flow passage. In this embodiment, the one-way valve 12 has multiple flow passages, and all the flow passages share the valve port 1223 and the flow guide port 1224.

[0142] Taking the example that the flow chamber 1226 is divided to form a flow sub-chamber 1227, and the flow sub-chamber 1227 corresponds to the flow guide port 1224 one by 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, the one-way valve 12 has multiple flow channels, and all the flow channels only share the valve port 1223.

[0143] In this embodiment, the valve port 1223, the flow chamber 1226 and the flow guide port 1224 are always connected to form a flow passage. When the valve core 121 is driven by an external force to deform the sealing portion 1222 and separate from the end cover 11 to form a flow port, the flow passage is directly connected to the flow port to facilitate subsequent exhaust and liquid injection.

[0144] See also Figures 11 to 15 , Fig.11 1 is a schematic diagram of the structure of the one-way valve 12 of the end cover assembly 10 in the first embodiment. Fig.12 is an exploded view of the one-way valve 12 of the end cover assembly 10 in the first embodiment, Fig.13 Schematic diagram of the structure of the valve core 121 of the one-way valve 12 in the first embodiment, Fig.14 is an exploded view of the one-way valve 12 of the end cover assembly 10 in the second embodiment, Fig.15 Schematic diagram of the structure of the one-way valve 12 of the end cover assembly 10 in the second embodiment.

[0145] In one or more embodiments of the present application, a valve cavity 1225 is defined in the valve body 122, and a valve port 1223 and a flow guide port 1224 both connected to the valve cavity 1225 are defined 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 defined in the valve core 121, and a flow channel is formed when the flow channel structure 1214 is connected to the flow guide port 1224.

[0146] The flow channel structure 1214 in the valve core 121 may be one or more, and the flow guide port 1224 on the valve body 122 may 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, a flow passage is formed when the flow channel structure 1214 is connected with the flow guide port 1224. In this embodiment, the one-way valve 12 has only one flow passage. Taking the case where there is one flow channel structure 1214 in the valve core 121 and there are 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 a flow passage. In this embodiment, there are multiple flow passages in the one-way valve 12, and all the flow passages share the same flow channel structure 1214. Taking the case where there are multiple flow channel structures 1214 in the valve core 121, there is one flow guide port 1224 on the valve body 122, and the flow guide ports 1224 are continuously arranged along the circumference of the connecting section 12221, all the 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 passage when connected to the same flow guide port 1224. In this embodiment, the one-way valve 12 has multiple flow passages, and all the flow passages share the same flow guide port 1224. Taking the case where there are multiple flow channel structures 1214 in the valve core 121 and multiple flow guide ports 1224 on the valve body 122 as an example, all the flow channel structures 1214 are arranged at intervals along the circumference of the valve core 121, and the flow guide ports 1224 are arranged at intervals along the circumference of the valve body 122, and correspond to all the flow channel structures 1214 one by one, and each flow channel structure 1214 is connected to the corresponding flow guide port 1224 to form a flow passage. In this embodiment, there are multiple flow passages in the one-way valve 12, and each flow passage is independently arranged.

[0147] When the valve core 121 is not acted upon by an 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 acted upon by an 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 until the flow channel structure 1214 is connected to the flow guide port 1224 to form a flow channel. Under this design, when the valve core 121 is not acted upon by an external force, the flow channel structure 1214 and the flow guide port 1224 fail to be connected to form a flow channel, and the one-way valve 12 itself has high sealing performance and excellent sealing performance.

[0148] 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 which are both connected to the valve core cavity 1213 are provided on the valve core 121; 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 a flow channel structure 1214.

[0149] Among them, the valve core 121 includes a first valve core section 1215, a second valve core section 1216 and a third valve core section 1217, and the first valve core section 1215, the second valve core section 1216 and the third valve core section 1217 are arranged in sequence along the thickness direction X of the end cover 11, and the second valve core section 1216 is connected between the first valve core section 1215 and the third valve core section 1217.

[0150] The first valve core section 1215 is annular, and a valve core opening 1211 is formed on one end of the first valve core section 1215 away from the third valve core section 1217. The first valve core section 1215, the second valve core section 1216 and the third valve core section 1217 surround and form a valve core cavity 1213, and the guide opening 1224 is defined by the second valve core section 1216.

[0151] In some embodiments, the second valve core segment 1216 may be a continuous annular structure, on which one or more flow passage openings 1212 are provided at intervals along the circumference of the valve core 121. In some embodiments, the second valve core segment 1216 is multiple and is spaced along the circumference of the valve core 121, and a flow passage opening 1212 is defined between each adjacent two second valve core segments 1216. Each second valve core segment 1216 extends along the thickness direction X of the end cover 11.

[0152] In this embodiment, the flow channel structure 1214 is independently provided in the valve core 121, and only the flow guide port 1224 is provided on the valve body 122, so that the flow channel structure 1214 can form a flow passage when communicating with the flow guide port 1224. This arrangement is conducive to simplifying the structure of the valve body 122 and the valve core 121, and reducing the manufacturing cost of the one-way valve 12.

[0153] Further, 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, and the second valve core segment 1216 is connected between the first valve core segment 1215 and the third valve core segment 1217;

[0154] Please refer again Fig.13 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, and the valve core port 1211 is connected to the valve core sub-cavity 1213a to form a flow channel structure 1214.

[0155] In this embodiment, each flow channel structure 1214 shares the same valve port 1223 .

[0156] 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 section 1216 is simple and easy to operate, and facilitates the molding of the flow channel structure 1214 .

[0157] Please refer again Figure 14 to Figure 15 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, and 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.

[0158] Specifically, the second valve core section 1216 extends along the thickness direction X of the end cover 11, and a guide port 1224 is formed between each two adjacent second valve core sections 1216. In this embodiment, the valve core port 1211, the valve core cavity 1213 and each guide port 1224 are connected in sequence to form a flow channel structure 1214, and the one-way valve 12 has a plurality of flow channel structures 1214, and all flow channel structures 1214 share the valve core port 1211 and the valve core cavity 1213.

[0159] This design facilitates simplifying the structure of the valve core 121 and reducing the manufacturing cost of the one-way valve 12 .

[0160] Please refer to Fig.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.

[0161] The extrusion surface 12a refers to the area where the valve core 121 can abut against at least part of the inner wall of the valve body 122 when at least part of it is fitted into the valve body 122. When the valve is opened, the sealing portion 1222 is compressed and deformed, which exerts a pulling force on the fixing portion 1221 toward the inside of the battery cell 100. This can easily cause the fixing portion 1221 to collapse and deform toward the inside due to the pulling force, thereby causing the structure of the one-way valve 12 on the end cover 11 to become unstable.

[0162] 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 internal collapse deformation, thereby making the structure of the fixed part 1221 more stable, thereby improving the stability of the overall structure of the one-way valve 12.

[0163] The extrusion surface 12a may have a variety of structural designs, for example, it may be an annular curved surface or an inclined plane, etc., as long as the abutment force on the inner wall of the fixing portion 1221 can be gradually increased during the process of the valve core 121 driving the sealing portion 1222 to deform. At the same time, 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 along the side of the sealing portion 1222 in the thickness direction X of the end cover 11.

[0164] 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, and the second valve core segment 1216 is connected between the first valve core segment 1215 and the third valve core segment 1217. At this time, 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 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.

[0165] With such a 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 portion 1221 gradually increases, causing the fixed portion 1221 to deform in a direction away from its own interior, thereby offsetting or partially offsetting the internal collapse deformation and improving the stability of the overall structure of the one-way valve 12.

[0166] Please refer to Fig.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 spacing L between the extrusion surface 12a and the reference line 12b gradually increases in a direction opposite to the driving direction.

[0167] 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, which 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 .

[0168] The distance L between the extrusion surface 12a and the reference line 12b gradually increases in a direction opposite to the driving direction, which can be understood as: the distance L gradually increases from one end of the extrusion surface 12a close to the sealing portion 1222 to the other end of the extrusion surface 12a away from the sealing portion 1222.

[0169] It should be noted that when the spacing L gradually increases in the direction opposite to the driving direction, the extrusion surface 12a will gradually increase the amount of outward extrusion of the fixing portion 1221 during the deformation of the driving sealing portion 1222, so that the fixing portion 1221 and the end cover 11 are more tightly combined. The extrusion surface L can be designed as an inclined plane, or a curved surface that bends outward along a line away from the reference line.

[0170] 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 one end of the extrusion surface 12a close to the sealing portion 1222 to one end of the extrusion surface 12a away from the sealing portion 1222 .

[0171] In this design, the spacing L of the extrusion surface 12a is designed to be a gradually increasing structure, and the outward extrusion amount of the fixing portion 1221 is gradually increased, so that the fixing portion 1221 and the end cover 11 are more tightly connected, further improving the stability of the structure.

[0172] Please refer to Fig.17 In one or more embodiments of the present application, an abutting protrusion 12c is provided on the inner wall of the fixing portion 1221, and the abutting protrusion 12c abuts against the extrusion surface 12a.

[0173] 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.

[0174] 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 .

[0175] In addition, the abutting protrusion 12c is provided on the inner wall of the fixing portion 1221, which 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 the structural stability.

[0176] 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 .

[0177] 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, adding the abutting protrusion 12c is also conducive to enhancing the structural strength and further improving the structural stability.

[0178] Please refer to Fig.17 In one or more embodiments of the present application, the abutting protrusion 12 c is arranged in an annular shape along the outer periphery of the valve core 121 .

[0179] 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.

[0180] When the abutting convex portion 12c is an annular structure, the number of the abutting convex portion 12c may be one or more. When there are more than one abutting convex portion 12c, the abutting convex portion 12c may be spaced apart along the thickness direction X or the driving direction. Meanwhile, in the driving direction, the height of each abutting convex portion 12c protruding from the inner wall of the fixing portion 1221 may be consistent or inconsistent, for example, along the driving direction, the height of each abutting convex portion 12c protruding from the inner wall of the fixing portion 1221 gradually increases.

[0181] In this way, 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.

[0182] Please refer to Fig.17 In one or more embodiments of the present application, the abutting protrusion 12c is located at an end of the inner wall of the fixing portion 1221 away from the sealing portion 1222.

[0183] The abutting protrusion 12c is arranged at an 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 against the end cover 11.

[0184] Such a design makes it easier for the abutting protrusion 12c to abut against the end cover 11 under force, so that the fixing portion 1221 can abut against the end cover 11 better, thereby improving the stability of the structure.

[0185] Please refer to Fig.17 In one or more embodiments of the present application, a side of the abutting protrusion 12c facing the valve core 121 includes 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.

[0186] 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.

[0187] 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 .

[0188] 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 abutment surface 12d and reduce the wear on the extrusion surface 12a.

[0189] Please refer again Figures 4 to 7 In a third aspect, the present application provides an end cover assembly 10, which includes: an end cover 11, which is provided with an injection hole 111 along its thickness direction X; and a one-way valve 12 as any of the above items, wherein the valve body 122 is assembled in the injection hole 111.

[0190] The end cover assembly 10 provided in the present application has the effects brought by any of the above-mentioned embodiments, so it will not be described in detail here.

[0191] Please refer again Figures 4 to 7 In the 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. Among them, 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.

[0192] Please refer again Figures 6 to 8 The fixing portion 1221 is fixed to the end cover 11, and the fixing portion 1221 always remains in a position relative to the end cover 11 regardless of whether an external force acts on the valve core 121. The fixing portion 1221 may be located in the injection hole 111 and clamped with the hole wall of the injection hole 111; or the fixing portion 1221 may be located on the side of the end cover 11 facing away from the inside of the housing 20 and abut against the outer end surface 113 of the end cover 11.

[0193] The sealing part 1222 is an elastic component, such as a rubber material, etc., which is separated from the end cover 11 by deformation such as contraction and elongation under the action of external force to form a flow port. When the external force is removed, the sealing part 1222 automatically recovers its deformation and re-seals with the end cover 11. It should be noted that when the external force is removed, there is a certain pre-pressure between the sealing part 1222 and the end cover 11, so that the rebound force of the sealing part 1222 can provide a sealing force, thereby improving the sealing effect of the injection hole 111.

[0194] 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 injection hole 111. In this embodiment, a flow outlet is formed when the sealing portion 1222 is separated from the hole wall of the 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.

[0195] 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 is separated from the end cover 11 to form a flow port. Among them, there are many ways to act on the sealing portion 1222, such as: using the valve core 121 in any of the above embodiments, the valve core 121 is at least partially matched on the sealing portion 1222, and the sealing portion 1222 is driven to deform toward the inside of the battery cell 100. Among them, the valve core 121 and the sealing portion 1222 can be detachably matched, 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.

[0196] With such a 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 process of the battery 1000 can be effectively reduced, thereby improving the water-proof effect and injection efficiency of the battery cell 100 .

[0197] Please refer again Figure 3 In a fourth aspect, the present application provides a battery cell 100, which includes a shell 20 and an end cover assembly 10, wherein one end of the shell 20 has an opening, and 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.

[0198] The battery cell 100 provided in the present application has the effects brought by any of the above-mentioned embodiments, so it will not be described in detail here.

[0199] Please refer again Figure 2 In a fifth aspect, the present application provides a battery 1000, which includes a battery cell 100 as described in any one of the above embodiments.

[0200] The battery 1000 provided in the present application has the effects brought by any of the above-mentioned embodiments, so it will not be described in detail here.

[0201] Please refer again Figure 1 In a sixth aspect, the present application provides an electrical device, which includes a battery 1000 as described in the embodiment, and the battery 1000 is used to provide electrical energy to the electrical device.

[0202] The electrical device provided in the present application has the effects brought by any of the above-mentioned embodiments, so it will not be described in detail here.

[0203] like Figures 3 to 9 As described, according to one or more embodiments in the present application, the present application provides an end cover assembly 10, the end cover assembly 10 includes an end cover 11 and a one-way valve 12, the end cover 11 is provided with an injection hole 111 along its 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, the sealing portion 1222 is connected to the fixing portion 1221 and is sealed with the end cover 11, the valve core 121 is at least partially equipped 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 an external force to separate from the end cover 11 to form a flow port, and the flow port is connected to the flow channel.

[0204] It can be seen that in the present application, when the valve core 121 is not subjected to external force, the sealing portion 1222 seals with the end cover 11 and blocks the flow channel and the internal environment of the battery cell 100. In this way, the medium cannot be exchanged between the outside and the internal environment of the battery cell 100, that is, exhaust or injection is impossible. The internal environment of the battery cell 100 is minimally affected by the outside, and the water-proof effect is good. Therefore, in the subsequent injection process, there is no need to evacuate the battery cell 100, and the injection efficiency is high. When the valve core 121 is subjected 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 process of the battery 1000 can be effectively reduced, thereby improving the water isolation effect and injection efficiency of the battery cell 100 .

[0205] 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 port. The method of stretching and forming a flow port 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 restores its deformation, and the sealing portion 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 that affects the performance of the battery cell 100.

[0206] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A one-way valve for sealing or opening a liquid injection hole (111) of an end cover (11), characterized in that: The one-way valve comprises: 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, characterized in that: 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, characterized in that: The sealing portion (1222) and the fixing portion (1221) are both elastic structures and are integrally arranged.

4. The one-way valve according to claim 1, characterized in that: 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, characterized in that: 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 claim 1, characterized in that: 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 claim 1, characterized in that: 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 claim 1, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The abutting protrusion (12c) is arranged in an annular shape along the outer circumference of the valve core (121); and / or, The abutting protrusion (12c) is located at an end of the inner wall of the fixing portion (1221) away from the sealing portion (1222).

16. The one-way valve according to claim 14, characterized in that: 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).

17. An end cap assembly, characterized in that: The end cap assembly comprises: The end cover (11) is provided with a liquid injection hole (111) extending through the end cover along its thickness direction (X); According to the one-way valve according to any one of claims 1 to 16, the valve body (122) is assembled in the liquid injection hole (111).

18. An end cap assembly, characterized in that: The end cap assembly comprises: 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.

19. A battery cell, characterized in that: include: a housing (20) having an opening at one end; and As described in the end cover assembly of claim 17 or 18, 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).

20. A battery, characterized in that: Comprising the battery cell as claimed in claim 19 above.

21. An electrical device, characterized in that: The invention comprises a battery as claimed in claim 20, wherein the battery is used to provide electrical energy to the electrical device.

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