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

Abstract

The present application relates to a one-way valve, an end cover assembly, a battery cell, a battery and an electrical device. When a valve core is not subjected to an external force, a sealing portion is in sealing fit with a liquid injection hole and blocks a flow passing channel and the internal environment of a battery cell. Thus, medium exchange cannot be carried out between the exterior and the internal environment of the battery cell, gas exhaust or liquid injection likewise cannot be carried out, the internal environment of the battery cell is less influenced by the external environment, the waterproof effect is good, so that the battery cell does not need to be vacuumized during subsequent liquid injection, and the liquid injection efficiency is high. When the valve core is subjected to an external force, the sealing portion is separated from an end cover to form a flow passing port, and the flow passing port is communicated with the flow passing channel. Therefore, vapor formed by evaporation of water in an electrode assembly can be discharged to the exterior through the flow passing port and the flow passing channel to exhaust gas.

Description

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

[0001] Related applications

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

[0003] This application claims priority to Chinese patent application No. 2024103709206, filed on March 28, 2024, entitled “One-way valve, end cover assembly, battery cell, battery and electrical device,” the entire text of which is hereby incorporated by reference. Technical Field

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

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

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

[0007] Summary of the Invention

[0008] Based on this, it is necessary to provide a one-way valve, an end cover assembly, a battery cell, a battery and an electrical device that can alleviate the problems of poor water isolation and low liquid injection efficiency in the manufacture of battery cells.

[0009] In the first aspect, the present application provides a one-way valve for sealing or opening the liquid injection hole of the end cover, the one-way valve comprising: a valve core; a valve body for being assembled in the liquid injection hole, and comprising a sealing portion, the sealing portion being used to seal and cooperate with the liquid injection hole, the valve core being at least partially fitted within the valve body and defining with the valve body a flow channel for communicating with the outside; wherein the valve core is configured to drive the sealing portion to deform under the action of an external force and separate from the end cover to form a flow port, the flow port being connected to the flow channel.

[0010] In the above-mentioned one-way valve, when the valve core is not subject to external force, the sealing portion and the injection hole seal and block the flow channel and the internal environment of the battery cell. In this way, the medium cannot be exchanged between the outside and the internal environment of the battery cell, that is, exhaust or injection cannot be performed. The internal environment of the battery cell is minimally affected by the outside, and the water barrier effect is good. Therefore, there is no need to evacuate the battery cell in the subsequent injection process, and the injection efficiency is high. When the valve core is subject to external force, the sealing portion separates from the end cover and forms a flow port, which is connected to the flow channel. Therefore, the water vapor formed by the evaporation of water in the electrode assembly can be discharged to the outside through the flow port and the flow channel to achieve exhaust. In addition, the electrolyte can also flow into the internal environment of the battery cell through the flow channel and the flow port and achieve injection. Therefore, by providing a one-way valve at the injection hole of the end cover, the impact of the outside on the internal environment of the battery cell during the battery production process can be effectively reduced, and the water barrier effect and injection efficiency of the battery cell can be improved.

[0011] In some embodiments, the one-way valve further includes an abutment member, which is disposed on the end cap and abuts against the side of the valve body facing away from the valve core, thereby ensuring a tight seal between the sealing portion and the injection hole. This design, combined with the introduction of the abutment member, allows the sealing portion to be tightly pressed against the injection hole, achieving an effective seal. This ensures that the interior of the battery cell remains sealed during transport from the exhaust station to the injection station, improving the watertightness of the battery cell.

[0012] In some embodiments, the abutment covers the sealing portion, and part of the inner wall of the abutment abuts the sealing portion. Designed in this way, the edge portion covers the sealing portion, which facilitates better pressing the sealing portion onto the end cap to achieve more effective sealing.

[0013] In some embodiments, a deformable recess is formed in the side of the sealing portion facing away from the valve core, and the portion of the sealing portion located outside the deformable recess abuts against the inner wall of the abutment member. This design, with the introduction of the deformable recess, facilitates deformation of the sealing portion toward the abutment member, thereby facilitating opening the injection port for venting or injecting liquid.

[0014] In some embodiments, the abutment member is provided with a first perforation, which is configured to allow the seal to deform at least partially along a side facing away from the valve core. This design, while still allowing for deformation of the seal, reduces or eliminates the gap between the seal and the abutment member that allows for deformation, thereby minimizing interference between the structures. This also reduces the space required by the one-way valve's associated accessories below the end cap, reducing the space occupied within the battery cell, thereby increasing the battery's energy density and enhancing the one-way valve's compatibility with different battery cells.

[0015] In some embodiments, the abutment member includes a cover portion and an edge portion disposed on the outer edge of the cover portion. The cover portion has a covering cavity, and the edge portion is configured to be disposed on the end cap. The covering cavity covers the end of the valve body that faces away from the valve core, and the cavity wall of the covering cavity abuts the valve body. This design, in which the abutment member is comprised of the cover portion and the edge portion, facilitates covering the sealing portion and mounting the abutment member on the end cap.

[0016] In some embodiments, the abutment member is provided with a first through-hole, and the outflow direction of the medium in the first through-hole intersects with the axial direction of the valve core. This design and the introduction of the first through-hole facilitate the medium to pass through the abutment member more easily during venting or filling, thereby facilitating smoother venting or filling operations. Furthermore, the outflow direction of the medium in the first through-hole intersects with the valve core, mitigating impact on the electrode assembly during filling.

[0017] In some embodiments, the one-way valve further includes an insulating cover, which is disposed over the abutment. This design, by introducing the insulating cover, insulates the abutment, preventing it from electrically contacting components within the battery cell, thereby improving battery reliability.

[0018] In some embodiments, the sealing portion includes a connecting segment configured to penetrate the liquid injection hole and a sealing segment connected to the connecting segment. The sealing segment and / or the connecting segment are configured to seal with the liquid injection hole, and the valve core at least partially engages with the connecting segment. With this design, during venting or injection, the valve core sinks and drives the sealing segment, which in turn stretches the connecting segment. The sealing segment and / or the connecting segment sink and separate from the end cap to form a flow opening. After venting or injection is completed, the connecting segment returns to its original shape, and the sealing portion re-seals with the end cap.

[0019] In some embodiments, the connecting section and the valve core are integrated into one piece, which is helpful in simplifying the structure of the one-way valve and significantly reducing manufacturing costs.

[0020] In some embodiments, the connection section and the valve core are detachably connected. With this design, after venting or filling, the valve core can be removed from the connection section, reducing the structure on the end cap, reducing the weight of the battery cell and reducing the space occupied on the end cap.

[0021] In some embodiments, one of the connecting section and the valve core is provided with a snap groove, and the other is provided with a snap projection that mates with the snap groove. This design, with its snap projection and snap groove, facilitates connection and removal of the connecting section and valve core, thereby facilitating the compression deformation of the valve core against the valve body. It also facilitates removal of the valve core and reduces the need for additional structure on the end cap.

[0022] In some embodiments, the circumferential portion of the sealing segment radially protrudes beyond the connecting segment, the circumferential portion of the sealing segment being configured to abut against the end cap, while the connecting segment is configured to seal against the wall of the injection hole. This design facilitates the connecting segment to closely fit against the wall of the injection hole, improving the sealing effect.

[0023] In some embodiments, a flow channel is provided on a surface of the sealing section facing the connecting section, and the flow port is connected to the flow channel. In this design, the introduction of the flow channel on the sealing section facilitates the stable flow of the medium on the sealing section, improving the stability of the exhaust or liquid injection operation.

[0024] In some embodiments, the valve core is provided with a flow chamber extending along the axis of the valve core to the surface of the sealing portion. The flow chamber and the surface of the sealing portion define a flow channel. This design, with the introduction of the flow chamber, facilitates the flow of electrolyte toward the sealing portion during the injection process, making the injection operation more convenient.

[0025] In some embodiments, the flow chamber is provided on a side of the valve core around its own axis; and / or, the flow chamber is provided inside the valve core.

[0026] In some embodiments, the valve core includes a valve core body and an extrusion portion connected to the valve core body, the extrusion portion protrudes from the valve core body in the radial direction of the valve core, and the flow cavity is provided in the valve core body and / or the extrusion portion.

[0027] In some embodiments, an extrusion groove is disposed on the end of the extrusion portion facing away from the valve core body, communicating with the flow chamber. The cross-sectional area of ​​the extrusion groove gradually decreases from the end of the extrusion groove away from the valve core body to the end of the extrusion groove closer to the valve core body. This design, combined with a well-designed extrusion groove, facilitates the collection of electrolyte in the flow chamber during the injection process, reducing electrolyte residue. Furthermore, the end of the extrusion portion acts as a protective fence, reducing electrolyte overflow.

[0028] In some embodiments, a valve cavity is provided in the valve body, and a valve port and a flow guide port both connected to the valve cavity are provided on the valve body. The valve port, the flow cavity and the flow guide port are connected in sequence to form a flow channel.

[0029] In some embodiments, a valve cavity is provided in the valve body, and a valve port and a flow guide port both connected to the valve cavity are provided on the valve body; the valve core is at least partially 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. With such a design, when the valve core is not subjected to external force, the valve core is at least partially located in the valve cavity, and the valve core and the cavity wall of the valve cavity are sealed to improve the sealing performance of the one-way valve. When the valve core is subjected to external force, the valve core sinks and drives the sealing section to separate from the end cover to form a flow port. At the same time, the valve core moves under the action of external force until the flow channel structure is connected to the flow guide port and forms a flow channel. Under this design, when the valve core is not subjected to external force, the flow channel structure and the flow guide port cannot be connected to form a flow channel, and the one-way valve itself has high sealing and excellent sealing performance.

[0030] In some embodiments, a valve core cavity is opened in the valve core, and a flow channel opening and a valve core opening are opened on the valve core, both of which are connected to the valve core cavity; the valve core opening, the valve core cavity and the flow channel opening are connected in sequence and constructed to form a flow channel structure.

[0031] In some embodiments, the valve core includes a first valve core section, a second valve core section and a third valve core section, and the second valve core section is connected between the first valve core section and the third valve core section; the second valve core section includes at least two, which are intersected and arranged in the valve core cavity and divide the valve core cavity into multiple valve core sub-cavities, and the valve core port is connected to the valve core sub-cavity to form a flow channel structure.

[0032] In some embodiments, the valve core includes a first valve core segment, a second valve core segment and a third valve core segment, the second valve core segment is connected between the first valve core segment and the third valve core segment; the second valve core segment includes at least two and is arranged at intervals along the circumference of the valve core.

[0033] In some embodiments, the one-way valve further includes a sealing ring, which is sleeved on the valve core and configured to seal with an end of the liquid injection hole facing away from the sealing portion when the sealing portion is separated from the end cover.

[0034] In some embodiments, the valve body further includes a fixing portion, the fixing portion is used to be connected to the end cover, and the sealing portion is connected to the fixing portion and is sealed with the end cover.

[0035] In some embodiments, a bayonet is formed between the fixing portion and the sealing portion, and the bayonet is used to snap into the hole wall of the liquid injection hole.

[0036] In some embodiments, the flow passages include a plurality of flow passages, all of which are spaced apart around the periphery of the valve core and are in communication with the flow port.

[0037] In a second aspect, the present application provides an end cover assembly, which includes: an end cover having an injection hole extending through the end cover along its thickness direction; and a one-way valve such as any of the above items, wherein the valve body is assembled in the injection hole.

[0038] In some embodiments, a sealing protrusion is provided on the end cover, the sealing protrusion extends around the periphery of the liquid injection hole, and the sealing protrusion abuts against the sealing portion.

[0039] On the third aspect, the present application provides an end cover assembly, which includes: an end cover with an injection hole extending through it along its thickness direction; a valve body, which is assembled in the injection hole and includes a sealing portion, the sealing portion is used to seal with the injection hole, and the valve body is used to define a flow channel for communicating with the outside between the valve body and the valve core; wherein 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.

[0040] In a fourth aspect, the present application provides a battery cell, which includes any one of the above end cover assemblies.

[0041] In a fifth aspect, the present application provides a battery comprising the above battery cells.

[0042] In a sixth aspect, the present application provides an electrical device comprising the above battery, which is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are merely embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the disclosed drawings without any creative work.

[0044] FIG1 is a schematic structural diagram of a vehicle in some embodiments of the present application.

[0045] FIG2 is an exploded view of a battery in some embodiments of the present application.

[0046] FIG3 is a schematic diagram of the structure of a battery cell in some embodiments of the present application.

[0047] FIG4 is a schematic structural diagram of the end cover assembly in the first embodiment of the present application.

[0048] FIG5 is a structural cross-sectional view of the end cap assembly shown in FIG4 .

[0049] FIG6 is a schematic exploded view of the structure of the end cover assembly shown in FIG4 .

[0050] FIG7 is a schematic structural diagram of the end cover assembly in the second embodiment of the present application.

[0051] FIG8 is a structural cross-sectional view of the end cap assembly shown in FIG7 .

[0052] FIG9 is a schematic structural diagram of the end cover assembly in the third embodiment of the present application.

[0053] FIG10 is a structural cross-sectional view of the end cap assembly shown in FIG9 .

[0054] FIG11 is a schematic exploded view of the structure of the end cover assembly shown in FIG7 .

[0055] FIG12 is a schematic exploded view of the structure of the end cover assembly shown in FIG9 .

[0056] FIG13 is a schematic structural diagram of the end cover assembly in the fourth embodiment of the present application.

[0057] FIG14 is a schematic structural diagram of the end cover assembly in the fifth embodiment of the present application.

[0058] FIG15 is a cross-sectional view of the end cover assembly shown in FIG13 along the AA direction.

[0059] FIG16 is a cross-sectional view of the end cover assembly shown in FIG14 along the BB direction.

[0060] Figure 17 is a structural schematic diagram of the one-way valve in the end cover assembly in the sixth embodiment of the present application.

[0061] FIG18 is a cross-sectional view of the one-way valve shown in FIG17 along the CC direction.

[0062] FIG19 is a top view of the one-way valve shown in FIG17 .

[0063] FIG20 is a schematic structural diagram of the one-way valve in the end cover assembly shown in FIG13.

[0064] FIG. 21 is an exploded view of the one-way valve shown in FIG. 20 .

[0065] FIG22 is a schematic structural diagram of the valve core in the one-way valve shown in FIG21 .

[0066] FIG. 23 is an exploded view of the one-way valve in the end cover assembly shown in FIG. 14 .

[0067] FIG24 is a schematic structural diagram of the one-way valve shown in FIG23 .

[0068] Figure Number:

[0069] 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; 114, sealing protrusion; 12, one-way valve; 121, valve core; 1211, valve core opening; 1212, flow channel opening; 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; 1218, valve core body; 1219, valve core branch; 12a, extrusion portion; 12b, extrusion groove; 12c, axis; 122, valve body; 1221, fixing portion; 12211, first sealing area; 12212, second sealing area; 1222, sealing part; 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; 1a, abutment; 1a1, cover body; 1aa, bottom edge; 1ab, surrounding edge; 1a2, edge portion; 1a3, covering cavity; 1a4, first perforation; 1a5, first through hole; 1b, insulating cover; 1b1, second perforation; 1b2, second through hole; 1c, deformation recess; 1c1, abutment protrusion; 1c2, flow guide; 1c3, buckle groove; 1c4, buckle protrusion; 123, sealing ring; 201, first part; 202, second part; X, thickness direction. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0071] Currently, market developments indicate that batteries are increasingly being used. They are not only used in energy storage systems such as hydropower, thermal, wind, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. As battery applications continue to expand, market demand is also growing.

[0072] Batteries consist of single cells, which undergo venting and injection processes during manufacturing. During the transition from venting to injection, the injection holes on the end caps of the battery cells remain open, leading to a series of problems such as poor water-blocking and low injection efficiency, significantly limiting battery production capacity.

[0073] Since the electrolyte cannot come into contact with water, the battery cells should be degassed at the exhaust station before being transported to the injection station for injection (electrolyte injection). Exhaust refers to baking the battery cells in a high-temperature and vacuum environment so that the moisture in the electrode assembly contained in the internal environment of the battery cells can evaporate and be discharged to the outside of the battery cells through the injection holes on the end caps of the battery cells. During the entire exhaust process, the injection holes are always open, which improves the reliability of exhaust. After the exhaust is completed, the battery cells are transported from the exhaust station to the injection station. During this process, the injection holes are still open, resulting in poor water-proofing effect of the battery cells. Water vapor in the environment can easily enter the battery cells through the injection holes, affecting the normal use of the electrolyte injected subsequently. Therefore, when the battery cells are transported to the injection station, it is necessary to evacuate the interior of the battery cells again before performing the injection operation. The time required for vacuuming is long, which greatly prolongs the time the battery cells stay in the injection station and reduces the injection efficiency.

[0074] In order to alleviate the problems of poor water isolation and low injection efficiency caused by the opening of the injection hole of the battery cell, the present application provides a one-way valve for sealing or opening the injection hole on the end cover. The one-way valve includes a valve core and a valve body. The valve body is assembled in the injection hole, and the valve body has a sealing portion. The valve core is at least partially fitted in the valve body and defines a flow channel connected to the outside with the valve body.

[0075] When the valve core is not subject to external forces, the sealing portion and the end cap seal in cooperation to block the connection between the flow channel and the internal environment of the battery cell. In this way, the medium cannot be exchanged between the external and internal environments of the battery cell, the accommodating cavity is less affected by the outside world, and the water-proof effect is good. Therefore, in the subsequent injection process, there is no need to evacuate the internal environment of the battery cell, and the injection efficiency is high. When the valve core is subjected to external forces and drives the sealing portion to deform, the sealing portion separates from the end cap and forms a flow port, which is connected to the flow channel. Therefore, the water vapor formed by the evaporation of water in the electrode assembly can be discharged to the outside through the flow port and the flow channel, while the electrolyte can flow into the interior of the battery cell through the flow channel and the flow port to achieve injection.

[0076] Please refer to FIG. 1 , which is a schematic structural diagram of a vehicle 10000 in some embodiments of the present application.

[0077] The present embodiment provides an electrical device using a battery 1000 as a power source. The electrical device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0078] 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.

[0079] The vehicle 10000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1000 is provided inside the vehicle 10000. The battery 1000 may be provided at the bottom, head or tail of the vehicle 10000. The battery 1000 may be used to power the vehicle 10000. For example, the battery 1000 may serve as an operating power source for the vehicle 10000. The vehicle 10000 may further include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery 1000 to power the motor 3000, for example, to meet the power requirements for starting, navigating and driving the vehicle 10000.

[0080] In some embodiments of the present application, the battery 1000 can serve not only as an operating power source for the vehicle 10000, but also as a driving power source for the vehicle 10000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 10000.

[0081] Please refer to FIG. 2 , which is an exploded view of a battery 1000 in some embodiments of the present application.

[0082] The battery 1000 includes a housing 200 and a battery cell 100, with the battery cell 100 being housed within the housing 200. The housing 200 is used to provide a housing for the battery cell 100, and the housing 200 can have a variety of structures. In some embodiments, the housing 200 can include a first portion 201 and a second portion 202, which overlap with each other, and together define a housing for accommodating the battery cell 100. The second portion 202 can be a hollow structure with one end open, and the first portion 201 can be a plate-like structure, with the first portion 201 overlapping the open side of the second portion 202, so that the first portion 201 and the second portion 202 together define a housing. The first portion 201 and the second portion 202 can also be hollow structures with one end open, with the open side of the first portion 201 overlapping the open side of the second portion 202. Of course, the box body 200 formed by the first part 201 and the second part 202 can be in various shapes, such as a cylinder, a cuboid, etc.

[0083] In the battery 1000, there may be multiple battery cells 100, and the multiple battery cells 100 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 100. The multiple battery cells 100 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery 100 structure may be housed within the housing 200. Of course, the battery 1000 may also be a battery module formed by first connecting multiple battery cells 100 in series, in parallel, or in a hybrid connection, and then the multiple battery modules 1000 are further connected in series, in parallel, or in a hybrid connection to form an entire battery 1000 structure, and then housed within the housing 200. The battery 1000 may also include other structures, for example, the battery 1000 may also include a busbar component for electrically connecting the multiple battery cells 100.

[0084] 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.

[0085] The battery cell 100 is the smallest unit constituting the battery 1000. The battery cell 100 includes an electrode assembly 30, a housing 20, and an end cap assembly 10.

[0086] 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 tab. The positive and negative electrode tabs may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 1000, the positive electrode active material and the negative electrode active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0087] The housing 20 is a component that cooperates with the end cap 11 in the end cap assembly 10 to form an internal environment for the battery cell 100. This internal environment can accommodate the electrode assembly 30, electrolyte, and other components. The housing 20 and end cap 11 can be separate components. An opening can be provided in the housing 20, and the end cap 11 is placed over the opening to form the internal environment of the battery cell 100. Alternatively, the end cap 11 and housing 20 can be integrated. In some examples, the end cap 11 and housing 20 can form a common connection surface before other components are inserted into the housing. When the interior of the housing 20 is to be enclosed, the end cap 11 is placed over the housing 20. The housing 20 can have a variety of shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, and the like. In some examples, the shape of the housing 20 can be determined based on the specific shape and size of the electrode assembly 30. The housing 20 can be made of a variety of materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic, and this is not particularly limited in the present embodiments.

[0088] The end cap assembly 10 includes an end cap 11, which is a component that covers the opening of the housing 20 to isolate the internal environment of the battery cell 100 from the outside. The shape of the end cap 11 can be adapted to the shape of the housing 20 to fit the housing 20. For example, the end cap 11 can be made of a material with a certain hardness and strength (such as an aluminum alloy). This prevents the end cap 11 from deforming when subjected to compression or collision, thereby providing the battery cell 100 with greater structural strength and improved safety. Functional components such as electrode terminals can be provided on the end cap 11. The electrode terminals can be used to electrically connect to the electrode assembly 30 to output or input electrical energy to the battery cell 100. In some embodiments, the end cap 11 can also be provided with a pressure relief mechanism for relieving internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold. In some embodiments, an insulating member can be provided on the inside of the end cap 11 to isolate the electrical connection components within the housing 20 from the end cap 11 to reduce the risk of short circuits. For example, the insulating member may be made of plastic, rubber, or the like.

[0089] According to some embodiments of the present application, please refer to Figures 4 and 6. The present application provides a one-way valve 12 for sealing or opening the liquid injection hole 111 of the end cover 11. The one-way valve 12 includes: a valve core 121 and a valve body 122. The valve body 122 is used to be assembled in the liquid injection hole 111, and it includes a sealing portion 1222. The sealing portion 1222 is used to seal with the liquid injection hole 111. The valve core 121 is at least partially fitted in the valve body 122 and defines a flow channel for communicating with the outside with the valve body 122. The valve core 121 is configured to drive the sealing portion 1222 to deform under the action of an external force and separate from the end cover 11 to form a flow port, and the flow port is connected to the flow channel.

[0090] The internal environment of the battery cell 100 is defined by the end cap 11 and the housing 20. The liquid injection hole 111 of the end cap 11 is formed by the end cap 11 itself. The liquid injection hole 111 and the internal environment of the battery cell 100 are neither identical nor equivalent. The end cap 11 has an outer end surface 113 and an inner end surface 112 that are disposed opposite each other along its thickness direction X. The inner end surface 112 and the inner wall of the housing 20 define the internal environment of the battery cell 100. The outer end surface 113 faces away from the internal environment of the battery cell 100. The liquid injection hole 111 on the end cap 11 extends through the outer end surface 113 and the inner end surface 112 in sequence.

[0091] At the same time, when the injection hole 111 is sealed, the exterior of the side of the end cap 11 having the outer end surface 113 is not in communication with the interior of the battery cell 100, that is, the gas inside the battery cell 100 cannot be discharged to the outside through the injection hole 111; and the external electrolyte cannot be injected into the interior of the battery cell 100 through the injection hole 111. The sealing or opening of the injection hole 111 is respectively completed by the abutment or sealing correspondence between the sealing portion 1222 and the end cap 11. For example, the sealing portion 1222 and the end cap 11 are separated, so that a flow opening is formed between them. At this time, the gas inside the battery cell 100 can enter the flow channel located in the injection hole 111 through the flow opening; alternatively, the external electrolyte can enter the flow opening through the flow channel located in the injection hole 111 and be injected into the interior of the battery cell 100 through the flow opening.

[0092] The valve body 122 and the valve core 121 can be formed separately or integrally. In some embodiments, as shown in Figures 4, 7, and 8, the valve body 122 and the valve core 121 are formed separately. The separately formed valve body 122 and the valve core 121 can be connected by abutment, snap-fitting, or threaded connection. As shown in Figures 9 and 10, the valve body 122 and the valve core 121 are integrally formed.

[0093] When the valve core 121 is at least partially fitted into the valve body 122, a flow passage is defined between the valve core 121 and the valve body 122. The structure of the flow passage can be designed in a variety of ways, for example: the valve core 121 and the valve body 122 each have a recessed structure on their outer surfaces to form a flow passage; a recessed structure can also be provided on the outer surface of the valve core 121, and the recessed structure and the outer surface of the valve body 122 form a flow passage; of course, channels can also be provided inside the valve core 121 and / or the valve body 122 so that each channel constitutes a flow passage, wherein, when a channel constituting a flow passage is provided inside the valve body 122, an outlet communicating with the channel needs to be provided on the outer surface of the valve body 122, and when the injection hole 111 is sealed, the outlet can be blocked by the hole wall of the injection hole 111.

[0094] The sealing portion 1222 is an elastic component, such as a rubber material, which, under the action of an external force, separates from the end cap 11 by deforming, such as by contracting or stretching, to form a flow port. When the external force is removed, the sealing portion 1222 automatically recovers its deformation and re-engages with the end cap 11. It should be noted that when the external force is removed, a certain preload is applied between the sealing portion 1222 and the end cap 11, so that the rebound force of the sealing portion 1222 provides a sealing force, thereby improving the sealing effect on the injection hole 111.

[0095] Exemplarily, the sealing portion 1222 can achieve a sealed fit between the sealing portion 1222 and the end cover 11 by abutting against the hole wall of the liquid injection hole 111. In this embodiment, a flow outlet is formed when the sealing portion 1222 is separated from the hole wall of the liquid injection hole 111; and / or, the sealing portion 1222 can also achieve a sealed fit between the sealing portion 1222 and the end cover 11 by being received in the internal environment of the battery cell 100 and abutting against the inner end surface 112 of the end cover 11. In this embodiment, a flow outlet is formed when the sealing portion 1222 is separated from the inner end surface 112 of the end cover 11.

[0096] During actual production, the one-way valve 12, end cap 11, housing 20, and electrode assembly 30 are pre-packaged to form a battery cell 100. During venting, the battery cell 100 is located in the venting station and placed in a high-temperature, vacuum environment. A porous plate is used to press against the valve core 121. The opening of the flow channel, away from the flow port, communicates with the outside through the pore structure on the porous plate. Under the action of gravity on the porous plate, the valve core 121 sinks, driving the sealing portion 1222 to deform and separate from the end cap 11 to form a flow port. In this way, moisture within the electrode assembly 30 is evaporated by heat and sequentially flows through the flow port, the flow channel, and the pore structure of the porous plate to be discharged to the outside. After venting is completed, the porous plate is raised and its effect on the valve core 121 is released. Since the sealing portion 1222 has already deformed when it separated from the end cap 11, when the porous plate's effect on the valve core 121 is released, the sealing portion 1222 rebounds and re-engages with the end cap 11 in a sealed manner. At this time, the flow port is closed again, isolating the outside from the internal environment of the battery cell 100 , greatly reducing the medium exchange between the outside and the inside of the battery cell 100 , so that a high vacuum degree can still be maintained inside the battery cell 100 .

[0097] It is understood that the medium refers to a substance existing in the external environment and / or the internal environment of the battery cell 100. The substance existing in the external environment may be water vapor, air, etc. The substance existing in the internal environment of the battery cell 100 may be an electrolyte.

[0098] Afterwards, the battery cell 100 is transported to the liquid filling station for liquid filling. During the process of transporting the battery cell 100 from the exhaust station to the liquid filling station, the flow channel in the one-way valve 12 is always isolated from the internal environment of the battery cell 100, so the battery cell 100 still has a high degree of vacuum. Therefore, when the battery cell 100 is transported to the liquid filling station, it is not necessary to evacuate the battery cell 100.

[0099] During injection, the injection nozzle's rubber sleeve depresses the valve core 121, causing the valve core 121 to sink again, driving the sealing portion 1222 to separate from the end cap 11 and forming a flow port. In this way, the electrolyte flowing out of the injection nozzle flows through the flow channel and the flow port into the battery cell 100. After injection is completed, the injection nozzle is removed. At this time, when the pressure exerted by the injection nozzle on the valve core 121 disappears, the sealing portion 1222 and the end cap 11 reseal and cooperate, isolating the internal environment of the battery cell 100 from the outside of the battery cell 100, allowing the electrolyte to be sealed inside the battery cell 100 and undergo a chemical reaction.

[0100] 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 .

[0101] In addition, the valve body 122 is assembled in the liquid injection hole 111, and there are many ways to assemble it, such as: setting a fixing structure on the side of the end cover 11 facing the interior of the battery cell 100, and the fixing structure presses the sealing part 1222 onto the end cover 11; or setting a fixing structure on the part of the valve body 122 located in the liquid injection hole 111, and the fixing structure and the sealing part 1222 constitute a snap-fit ​​structure, so that the valve body 122 is snapped into the liquid injection hole 111, etc.

[0102] With such a design, when the valve core 121 is not subject to external force, the sealing portion 1222 seals with the end cover 11 and blocks the flow channel from the internal environment of the battery cell 100. In this way, there is no possibility of medium exchange between the outside and the internal environment of the battery cell 100, that is, no exhaust or injection is possible. The internal environment of the battery cell 100 is minimally affected by the outside, and the water barrier effect is good. Therefore, there is no need to evacuate the battery cell 100 in the subsequent injection process, and the injection efficiency is high. When the valve core 121 is subject to external force, the sealing portion 1222 separates from the end cover 11 and forms a flow port, which is connected to the flow channel. Therefore, the water vapor formed by the evaporation of water in the electrode assembly 30 can be discharged to the outside through the flow port and the flow channel to achieve exhaust. In addition, the electrolyte can also flow into the internal environment of the battery cell 100 through the flow channel and the flow port and achieve injection. Therefore, by providing a one-way valve 12 at the injection hole 111 of the end cover 11, the external impact on the internal environment of the battery cell 100 during the production of the battery 1000 can be effectively reduced, thereby improving the water isolation effect and injection efficiency of the battery cell 100.

[0103] According to some embodiments of the present application, the one-way valve 12 further includes abutment 1a, which is used to be arranged on the end cover 11, and the abutment 1a abuts against the side of the valve body 122 facing away from the valve core 121, so that the sealing portion 1222 is sealed and matched with the liquid injection hole 111.

[0104] The abutment 1a is located on the side of the end cover 11 facing the inside of the battery cell 100, that is, the abutment 1a is arranged on the inner end surface 112 of the end cover 11. When the abutment 1a is arranged on the end cover 11, it will abut the sealing portion 1222, so that it abuts against one end of the injection hole 111 and / or the hole wall to achieve effective sealing. There are many ways to connect the abutment 1a to the end cover 11, such as: welding, bonding, clamping, bolting, crimping, etc. Among them, crimping means that a structure can be covered on the outside of the abutment 1a, and the structure can abut the abutment 1a on the end cover 11. At the same time, there are many options for the material of the abutment 1a, as long as they have a certain structural strength, such as: metals such as aluminum, copper, iron, etc., or plastics and rubber, etc.

[0105] The abutment member 1a can be provided on one side of the sealing portion 1222, with the edge of the sealing portion 1222 abutting against the end cap 11. For example, the abutment member 1a can be designed as an L-shaped structure. Of course, the abutment member 1a can also cover the sealing portion 1222, so that the sealing portion 1222 is pressed against the end cap 11. When the abutment member 1a covers the abutment member 1a, a through-hole structure can be provided on the abutment member 1a so that the medium can enter the interior of the battery cell 100 or the flow port through the abutment member 1a.

[0106] Furthermore, when the liquid injection hole 111 is opened, the portion of the sealing portion 1222 abutted by the abutting member 1a does not separate from the end cap 11 and remains in contact with the end cap 11, so that after the external force disappears, the sealing portion 1222 is re-sealed in the liquid injection hole 111. However, the portion not abutted by the abutting member 1a may separate from the end cap 11 under the action of external forces, such as the pressure of the valve core 121, forming a flow port, allowing the flow channel to communicate with the interior of the battery cell 100 through the flow port.

[0107] With this design, the abutment 1a is introduced, so that the sealing portion 1222 is tightly pressed into the injection hole 111 to achieve effective sealing. In this way, during the process of being transported from the exhaust station to the injection station, the interior of the battery cell 100 is always sealed, thereby improving the water-proof performance of the battery cell 100.

[0108] According to some embodiments of the present application, referring to FIG. 5 , the abutting member 1 a covers the sealing portion 1222 , and a portion of the inner wall of the abutting member 1 a abuts against the sealing portion 1222 .

[0109] The abutment member 1a covers the sealing portion 1222, indicating that the abutment member 1a has a cap-like structure, and the sealing portion 1222 is located inside the abutment member 1a. This allows the abutment member 1a to better circumferentially abut against the sealing portion 1222. When an external force is applied to the sealing portion 1222, the sealing portion 1222 may deform toward one side of the abutment member 1a, and at least partially separate from the end cover 11 to form a flow port.

[0110] To facilitate the deformation of the sealing part 1222 inside the abutment 1a, a certain gap can be left between the abutment 1a and the sealing part 1222; or, a hole can be opened on the abutment 1a so that when the sealing part 1222 is deformed, at least part of it can pass through the hole and out of the abutment 1a.

[0111] With such a design, the edge portion 1a2 covers the sealing portion 1222, so that the sealing portion 1222 can be pressed onto the end cover 11 to achieve more effective sealing.

[0112] According to some embodiments of the present application, please refer to Figure 5. A deformation recess 1c is formed in the side of the sealing portion 1222 facing away from the valve core 121. The portion of the sealing portion 1222 located outside the deformation recess 1c abuts against the inner wall of the abutment 1a.

[0113] A deformation recess 1c is provided on the side of the sealing portion 1222 facing away from the valve core 121, so that the portion located in the deformation recess 1c is raised to form an abutment protrusion 1c1. The abutment protrusion 1c1 can be arranged at intervals on the periphery of the deformation recess 1c, or can be annular and extend around the periphery of the deformation recess 1c. When the sealing portion 1222 is subjected to an external force, the abutment protrusion 1c1 will also bend and deform on the abutment member 1a, so that the portion located in the deformation recess 1c can move toward the abutment member 1a, thereby allowing the sealing portion 1222 to at least partially separate from the end cover 11, forming a flow port.

[0114] The size of the deformation recess 1c can be determined according to the actual size of the one-way valve 12, as long as the sealing portion 1222 is able to form a flow opening with the end cover 11 after being deformed toward the abutment member 1a.

[0115] Such a design introduces the deformation recess 1c, which facilitates the deformation of the sealing portion 1222 toward the side of the abutting member 1a, thereby facilitating the opening of the liquid injection hole 111 for venting or injecting operations.

[0116] According to some embodiments of the present application, referring to FIG. 6 , a first through-hole 1 a4 is formed through the abutting member 1 a . The first through-hole 1 a 4 is configured to allow the sealing portion 1222 to deform at least partially along a side away from the valve core 121 .

[0117] When the injection hole 111 is opened, the sealing portion 1222 needs to deform toward the abutment 1a. Therefore, there should be a structure between the sealing portion 1222 and the abutment 1a that allows the sealing portion 1222 to deform. For example, a sufficient gap should be reserved between the sealing portion 1222 and the abutment 1a. However, if a sufficient gap is reserved, the size of the one-way valve 12 in the thickness direction X of the end cap 11 will be excessively increased, occupying too much space within the battery cell 100 and affecting the energy density of the battery 1000.

[0118] To this end, a first perforation 1a4 is provided through the abutment 1a. When deformed, the portion of the sealing portion 1222 located at the injection hole 111 can extend into or out of the first perforation 1a4. The shape of the first perforation 1a4 can be designed in a variety of ways, such as circular, square, etc., and can also be an irregular shape. At the same time, in some examples, the first perforation 1a4 is provided opposite to the sealing portion 1222 in the direction of the axis 12c of the valve core 121, and the projection of the portion of the sealing portion 1222 located at the injection hole 111 along the axis 12c of the valve core 121 is in the first perforation 1a4, which means that the size of the portion of the sealing portion 1222 located at the injection hole 111 is smaller than the size of the first perforation 1a4. In addition, providing the first perforation 1a4 on the abutment 1a can also facilitate the passage of the medium through the abutment 1a.

[0119] Of course, in this embodiment, a certain gap may be provided between the sealing portion 1222 and the abutment member 1a. For example, in some examples, a deformable recess 1c is formed in the side of the sealing portion 1222 facing away from the valve core 121. The deformable recess 1c is positioned opposite the first through-hole 1a4. The relationship between the dimensions of the deformable recess 1c and the first through-hole 1a4 can be designed in various ways. For example, the projection of the deformable recess 1c on the abutment member 1a may cover the first through-hole 1a4 or may even overlap the first through-hole 1a4. Of course, the projection may also be smaller than the size of the first through-hole 1a4.

[0120] With this design, the first perforation 1a4 is introduced. Under the premise of allowing the sealing portion 1222 to deform, the gap reserved for deformation between the sealing portion 1222 and the abutment 1a is reduced or eliminated, thereby reducing interference between structures. At the same time, the demand for space below the end cover 11 by the related accessories of the one-way valve 10 is reduced, and the space occupied by the battery cell 100 is reduced, which is beneficial to improving the energy density of the battery 1000. It also improves the compatibility of the one-way valve 10 structure with different battery cells 100.

[0121] According to some embodiments of the present application, please refer to Figure 5, the abutment 1a includes a cover body portion 1a1 and an edge portion 1a2 arranged on the outer edge of the cover body portion 1a1, the cover body portion 1a1 has a covering cavity 1a3, the edge portion 1a2 is used to be arranged on the end cover 11, the covering cavity 1a3 covers one end of the valve body 122 facing away from the valve core 121, and the cavity wall of the covering cavity 1a3 abuts against the valve body 122.

[0122] The cover portion 1a1 is a structure that covers and abuts the sealing portion 1222 and can be designed in a circular, square, or pentagonal shape. The edge portion 1a2 is a structure connected to the outer edge of the cover portion 1a1. It is provided on the end cap 11, allowing the abutment member 1a to be stably mounted on the end cap 11 and sealing the sealing portion 1222 in the injection hole 111. The edge portion 1a2 can be mounted on the end cap 11 in a variety of ways, such as, but not limited to, bolting, clamping, bonding, and compression.

[0123] The edge portions 1a2 may be spaced apart on the outer edge of the cover portion 1a1, or may extend in a circular manner along the outer edge of the cover portion 1a1. Furthermore, the connection between the edge portions 1a2 and the cover portion 1a1 may be, but is not limited to, bolting, clamping, riveting, welding, or bonding, or may be integrally formed, such as by injection molding, die-casting, or 3D printing.

[0124] In addition, when the abutting member 1 a is provided with a first through hole 1 a 4 , the first through hole 1 a 4 may be provided on the cover portion 1 a 1 .

[0125] In this design, the abutting member 1 a is designed as a cover portion 1 a 1 and an edge portion 1 a 2 , which facilitates the abutting member 1 a to cover the sealing portion 1222 and be installed on the end cover 11 .

[0126] According to some embodiments of the present application, referring to FIG. 5 , a first through hole 1 a 5 is formed through the abutting member 1 a , and a medium outflow direction in the first through hole 1 a 5 intersects with an axis 12 c of the valve core 121 .

[0127] The first through hole 1a5 refers to a structure that penetrates the abutment 1a and allows the medium to pass through the abutment 1a. For example, during exhaust, there is a flow opening between the sealing portion 1222 and the end cover 11. At this time, the medium in the battery cell 100 can enter between the abutment 1a and the sealing portion 1222 through the first through hole 1a5; then enter the flow channel located in the injection hole 111 through the flow opening, and finally be discharged from the battery cell 100.

[0128] The number of first through holes 1a5 can be one or more. When there are more than one first through holes 1a5, refer to Figure 6 , and all first through holes 1a5 are spaced apart along the circumference of the abutment member 1a. Furthermore, when the abutment member 1a includes a cover portion 1a1 and an edge portion 1a2 provided on the outer edge of the cover portion 1a1, the first through holes 1a5 can be provided on the edge portion 1a2 or on the cover portion 1a1.

[0129] In addition, the outflow direction of the medium in the first through hole 1a5 refers to the direction in which the medium flows out of the abutment member 1a from the first through hole 1a5, and intersects with the direction of the axis 12c of the valve core 121. That is, during the injection process, the medium will not directly impact the electrode assembly 30. The medium can be the electrolyte during the injection process or air or gas in the formed exhaust gas. The first through hole 1a5 can be distributed in various locations on the abutment member 1a. For example, the first through hole 1a5 can be provided on the bottom surface of the abutment member 1a or on the side surface of the abutment member 1a. In some examples, the abutment member 1a includes a cover portion 1a1 and an edge portion 1a2 disposed on the outer edge of the cover portion 1a1. The cover portion 1a1 includes a bottom edge 1aa and a surrounding edge 1ab. The bottom edge 1aa and the edge portion 1a2 are spaced apart in the direction of the axis 12c of the valve core 121. The surrounding edge 1ab is connected between the bottom edge 1aa and the edge portion 1a2. The bottom edge 1aa and the sealing portion 1222 are disposed opposite each other in the thickness direction X of the end cap 11. The first through hole 1a5 is disposed in the surrounding edge 1ab. Of course, the surrounding edge 1ab can be designed as a variable cross-section structure, such as: the cross-sectional area of ​​the surrounding edge 1ab gradually increases from the end near the bottom edge 1aa to the end near the edge portion 1a2. This allows the first through hole 1a5 to be disposed on the side of the abutment member 1a, dispersing the impact force of the electrolyte. During injection, this can reduce the possibility of the electrolyte directly impacting the electrode assembly 30 and causing abnormalities in the battery 1000 process.

[0130] Such a design and the introduction of the first through hole 1a5 make it easier for the medium to pass through the abutment member 1a during the exhaust or liquid injection process, so that the exhaust or liquid injection operation can be carried out more smoothly.

[0131] According to some embodiments of the present application, referring to FIG. 5 and FIG. 6 , the one-way valve 12 further includes an insulating cover 1 b , and the insulating cover 1 b is disposed on the abutting member 1 a .

[0132] The insulating cover 1b refers to a structure that covers the outside of the abutment 1a to achieve insulation protection for the abutment 1a. There are many options for the material of the insulating cover 1b, such as but not limited to plastic, rubber, etc. When the insulating cover 1b is a rubber structure, it can be an integrated structure with the insulating part (such as plastic) on the inner side of the end cover 11, for example: the insulating part on the inner side of the end cover 11 is convex downward to form the insulating cover 1b to cover the abutment 1a, which can reduce the additional structure on the inner side of the end cover 11. There are also many ways to install the insulating cover 1b on the end cover 11, such as but not limited to snap-on, pin-on, adhesive, etc.

[0133] If the abutment member 1a only abuts against the outer edge of the sealing portion 1222, the insulating cover 1b covers the abutment member 1a; if the abutment member 1a covers the sealing portion 1222, the insulating cover 1b can cover both the abutment member 1a and the outside of the sealing portion 1222. Meanwhile, referring to Figures 6, 11, and 12, when the abutment member 1a covers the sealing portion 1222, a first through-hole 1a5 and a first perforation 1a4 are provided thereon. The insulating cover 1b can also be provided with a second through-hole 1b2 and a second perforation 1b1. The second perforation 1b1 is arranged opposite to the first perforation 1a4, and the second through-hole 1b2 is arranged opposite to the first through-hole 1a5. In addition, the second through-hole 1b2 can be arranged on the side of the insulating cover 1b when it is positioned, so that the electrolyte can be reduced from directly impacting the electrode assembly 30 during injection.

[0134] With this design, the insulating cover 1 b is introduced to insulate the abutment 1 a so that the abutment 1 a does not come into electrical contact with components within the battery cell 100 , thereby improving the reliability of the battery 1000 .

[0135] According to some embodiments of the present application, please refer to Figure 5, the sealing portion 1222 includes a connecting section 12221 for passing through the liquid injection hole 111, and a sealing section 12222 connected to the connecting section 12221. The sealing section 12222 and / or the connecting section 12221 are used to seal and cooperate with the liquid injection hole 111, and the valve core 121 is at least partially cooperated with the connecting section 12221.

[0136] The sealing portion 1222 includes a connecting section 12221 and a sealing section 12222. The connecting section 12221 is located inside the injection hole 111 and between the valve core 121 and the sealing section 12222. The sealing section 12222 can be located entirely outside the injection hole 111 or at least partially inside the injection hole 111. There are many ways to achieve sealing of the liquid injection hole 111, such as: the surface of the connecting section 12221 is tightly fitted with the hole wall of the liquid injection hole 111; or, the sealing section 12222 is tightly fitted with the inner end face 112 of the end cover 11. It should be noted that if the sealing section 12222 is pressed against the inner end face 112 by the abutment 1a, the pressed part of the sealing section 12222 cannot be separated from the inner end face 112 of the end cover 11. Therefore, during structural design, the unpressed part of the sealing section 12222 can be separated from the inner end face 112 under the action of external force to form a flow outlet. For example, the edge of the sealing section 12222 has a structure extending radially outward, and the abutment 1a presses the radially outward extending structure onto the inner end face 112, so that a part of the sealing section 12222 can be separated from the inner end face 112 under the action of external force. Alternatively, the portion of the sealing section 12222 located in the liquid injection hole 111 is sealed and fitted with the liquid injection hole 111; of course, it can also be a combination of any two or more of the above.

[0137] In some embodiments, referring to Figures 5 and 8 , the sealing segment 12222 is located outside the injection hole 111 and is housed within the internal environment of the battery cell 100. The sealing segment 12222 presses against the inner end surface 112 of the end cap 11 to achieve a sealed fit. In this embodiment, under the action of an external force, the valve core 121 drives the connecting segment 12221 to stretch, allowing the sealing segment 12222 to move relative to the end cap 11 along the thickness direction X of the end cap 11, separating from the inner end surface 112 of the end cap 11 and forming a flow outlet. In some embodiments, referring to Figure 10 , the sealing segment 12222 is at least partially located within the injection hole 111 and abuts against the hole wall or the hole edge at one end of the injection hole 111 to achieve a sealed fit. In this embodiment, when 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 outlet.

[0138] The connecting section 12221 and the valve core 121 are designed to be detachable. After the battery cell 100 is vented or filled, the valve core 121 can be removed from the connecting section 12221, leaving only the valve body 122 in the battery cell 100, thereby reducing the structure on the battery cell 100. Of course, the connecting section 12221 and the valve core 121 can also be designed as an integrated structure.

[0139] With this design, when venting or injecting liquid, the valve core 121 sinks and drives the sealing section 12222, which in turn stretches the connecting section 12221. The sealing section 12222 and / or the connecting section 12221 sink and separate from the end cap 11, forming a flow opening. After venting or injecting liquid, the connecting section 12221 recovers its deformation, and the sealing section 1222 re-seals with the end cap 11.

[0140] According to some embodiments of the present application, referring to FIG. 10 and FIG. 12 , the connecting section 12221 and the valve core 121 are an integrated structure.

[0141] The integrated structure means that the connecting section 12221 and the valve core 121 are prepared by an integrated molding method, for example, the connecting section 12221 and the valve core 121 are prepared by injection molding, die casting, 3D printing, etc. In some examples, the connecting section 12221 and the valve core 121 are both elastic structures and are provided integrally.

[0142] 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.

[0143] In some examples, at least the sealing portion 1222 is an elastic component. Under the action of an external force, the valve core 121 causes the sealing portion 1222 to stretch along the thickness direction X of the end cap 11, thereby increasing the portion of the sealing portion 1222 extending into the internal environment of the battery cell 100. Furthermore, the sealing portion 1222 separates from the inner end surface 112 of the end cap 11 and / or the wall of the liquid injection hole 111, forming a flow outlet.

[0144] In addition, by setting the valve core 121 and the sealing portion 1222 as an integrated structure, the sealing portion 1222 can be driven to stretch along the thickness direction X of the end cover 11 under the action of an external force until it is separated from the end cover 11 to form a flow outlet. The method of stretching and forming a flow outlet is simple to operate, and 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 recovers its deformation and the sealing portion 1222 is sealed with the end cover 11 again. During this process, the residual electrolyte in the valve core 121 flows into the internal environment of the battery cell 100 through the flow channel, which helps to reduce the crystallization or moisture absorption of the electrolyte in the valve core 121 and affect the performance of the battery cell 100.

[0145] Such a design is beneficial for simplifying the structure of the one-way valve 12 and thus significantly reducing the manufacturing cost.

[0146] According to some embodiments of the present application, referring to FIG. 6 and FIG. 11 , the connecting section 12221 and the valve core 121 are detachably connected.

[0147] The valve core 121 and the connecting section 12221 are detachably connected, so that after the exhaust or injection is completed, the valve core 121 can be removed from the connecting section 12221 to reduce the structure on the end cover 11. There are many ways to detach the valve core 121 and the connecting section 12221, such as plug-in connection, clip connection, threaded connection, etc.

[0148] With this design, after venting or filling, the valve core 121 can be removed from the connecting section 12221 , reducing the structure on the end cover 11 , and reducing the weight of the battery cell 100 and the space occupied on the end cover 11 .

[0149] According to some embodiments of the present application, referring to FIG. 5 and FIG. 8 , one of the connecting section 12221 and the valve core 121 is provided with a buckle groove 1c3 , and the other is provided with a buckle protrusion 1c4 that cooperates with the buckle groove 1c3 .

[0150] The snap groove 1c3 refers to a concave structure on the connecting section 12221 or the valve core 121. When it cooperates with the snap protrusion 1c4, it can connect the connecting section 12221 to the valve core 121. The snap groove 1c3 can be provided on the connecting section 12221, and the snap protrusion 1c4 can be provided on the valve core 121; alternatively, the snap groove 1c3 can be provided on the valve core 121, and the snap protrusion 1c4 can be provided on the connecting section 12221.

[0151] Such a design introduces the snap protrusion 1c4 and the snap groove 1c3, which facilitates the connection and disassembly of the connecting section 12221 and the valve core 121, thereby facilitating the valve core 121 to squeeze and deform the valve body 122; at the same time, it is convenient to remove the valve core 121 and reduce the structure on the end cover 11.

[0152] According to some embodiments of the present application, referring to FIG. 5 , the circumferential portion of the sealing segment 12222 radially protrudes from the connecting segment 12221 . The circumferential portion of the sealing segment 12222 is used to abut against the end cover 11 , and the connecting segment 12221 is used to seal against the wall of the injection hole 111 .

[0153] The circumferential portion of the sealing segment 12222 refers to the portion of the sealing segment 12222 located on the periphery of the connecting segment 12221. When the connecting segment 12221 is inserted into the liquid injection hole 111, this circumferential portion is located outside the liquid injection hole 111 and abuts against the inner end surface 112 of the end cap 11. In some examples, the one-way valve 12 further includes an abutment member 1a. The abutment member 1a covers the sealing segment 12222, and its inner wall abuts against the circumferential portion of the sealing segment 12222, so that the sealing segment 12222 is tightly pressed against the end cap 11.

[0154] During the exhaust or injection process, under the action of an external force, the valve core 121 pushes the connecting section 12221 and the sealing section 12222, causing both to deform, thereby separating the connecting section 12221 from the wall of the injection hole 111, thereby forming a flow opening between the connecting section 12221 and the end cap 11. Of course, in addition to abutting against the inner end surface 112 of the end cap 11, the sealing section 12222 can also seal with the injection hole 111. For example, a portion of the sealing section 12222 close to the connecting section 12221 seals against the edge of one end of the injection hole 111.

[0155] Such a design facilitates the connection section 12221 to fit closely against the wall of the liquid injection hole 111, thereby improving the sealing effect.

[0156] According to some embodiments of the present application, referring to FIG. 6 , a drainage channel 1c2 is provided on a surface of the sealing section 12222 facing the connecting section 12221 , and the flow port is in communication with the drainage channel 1c2 .

[0157] The drainage channel 1c2 refers to a concave structure on the sealing section 12222, and the drainage channel 1c2 extends from one end of the connecting section 12221 to the edge of the sealing section 12222. When a flow port is formed between the sealing portion 1222 and the end cover 11, the drainage channel 1c2 on the sealing section 12222 will communicate with the flow port, so that during the exhaust or liquid injection process, the medium will flow from the flow port to the drainage channel 1c2; or, flow from the drainage channel 1c2 to the flow port. The number of drainage channels 1c2 can be one or more. When the number of drainage channels 1c2 is more than one, all drainage channels 1c2 are spaced apart around the periphery of the connecting section 12221.

[0158] With such a design, the drainage channel 1c2 is introduced on the sealing section 12222, so as to facilitate the stable flow of the medium on the sealing section 12222 and improve the stability of the exhaust or liquid injection operation.

[0159] According to some embodiments of the present application, please refer to Figure 5, the valve core 121 is provided with a flow chamber 1226, the flow chamber 1226 extends along the axis 12c of the valve core 121 to the surface leading to the sealing part 1222, and the flow chamber 1226 and the surface of the sealing part 1222 define a flow channel.

[0160] The flow cavity 1226 refers to the structure on the valve core 121 that allows the medium to pass through, and is also part of the flow channel. The flow cavity 1226 extends along the axis 12c of the valve core 121 to the surface leading to the sealing portion 1222, which means that the flow channel can be composed of the flow cavity 1226 and part of the surface of the sealing portion 1222. In this way, during the injection process, the electrolyte can flow from the flow cavity 1226 to the surface of the sealing portion 1222. When the sealing portion 1222 forms a flow port with the end cover 11 under the action of external force, the electrolyte on the surface of the sealing portion 1222 flows from the flow port into the interior of the battery cell 100.

[0161] The flow chamber 1226 can be distributed in various locations on the valve core 121. For example, the flow chamber 1226 can be disposed inside the valve core 121 or on the surface of the valve core 121. Of course, a portion of the flow chamber 1226 can be disposed inside the valve core 121, while another portion can be disposed on the surface of the valve core 121.

[0162] When the flow cavity 1226 is disposed within the valve core 121, referring to Figures 5 and 8 , a communication port communicating with the flow cavity 1226 must also be provided on the valve core 121, with the communication port leading to the surface of the sealing portion 1222. The communication port can be provided on the side of the valve core 121 facing the injection hole 111, or on the bottom surface of the valve core 121 facing the sealing portion 1222.

[0163] With this design, the flow cavity 1226 is introduced, which makes it easier for the electrolyte to flow toward the sealing portion 1222 during the injection process, making the injection operation more convenient.

[0164] According to some embodiments of the present application, the flow chamber 1226 is arranged on the side of the valve core 121 around its own axis 12 c; and / or, the flow chamber 1226 is arranged inside the valve core 121.

[0165] When the flow chamber 1226 is arranged on the side of the valve core 121 around its own axis 12c, please refer to Figures 10 and 12, the medium will flow through the side of the valve core 121 to the sealing portion 1222 or be discharged to the outside. Since the flow chamber 1226 is located on the surface of the valve core 121, when the valve core 121 is at least partially fitted on the sealing portion 1222, the flow chamber 1226 can be surrounded by the hole wall of the injection hole 111 or a part of the sealing portion 1222, so that the medium in the flow chamber 1226 can flow along the axis 12c of the valve core 121. When the flow chamber 1226 is arranged inside the valve core 121, it is necessary to open a communication port on the valve core 121 that is connected to the flow chamber 1226, and the communication port leads to the surface of the sealing portion 1222.

[0166] The shape of the flow chamber 1226 can be designed in a variety of ways. For example, the cross-sectional shape of the flow chamber 1226 can be regular, such as an ellipse, a circle, a square, a pentagon, or an irregular shape. The number of flow chambers 1226 can be one or more. When there are multiple flow chambers 1226, all flow chambers 1226 are arranged in parallel and spaced apart.

[0167] With such a design, the distribution position of the flow chamber 1226 is reasonably set, so that the exhaust or liquid injection operation can be carried out stably.

[0168] According to some embodiments of the present application, please refer to Figure 5, the valve core 121 includes a valve core body 1218 and an extrusion portion 12a connected to the valve core body 1218, the extrusion portion 12a protrudes from the valve core body 1218 along the radial direction of the valve core 121, and the flow chamber 1226 is provided in the valve core body 1218 and / or the extrusion portion 12a.

[0169] The valve core body 1218 is the structure on the valve core 121 that is close to the valve body 122 when the valve core 121 is engaged with the valve body 122. The valve core body 1218 can be directly and detachably inserted into the valve body 122, or can be snap-fitted to the valve body 122. The extrusion portion 12a is the structure that is away from the valve body 122 when the valve core 121 is engaged with the valve body 122. During the exhaust or injection process, the extrusion portion 12a directly bears external force and, by pressing down on the valve core body 1218, drives the sealing portion 1222 and the end cap 11 to separate, thereby forming a flow port.

[0170] The extrusion portion 12a protrudes radially outward from the valve core body 1218 of the valve core 121. Thus, when the valve core 121 is pressed downward, the portion of the extrusion portion 12a protruding outward from the valve core body 1218 can act as a limiter, thereby reducing the risk of over-pressing the valve core 121. In some examples, the circumferential edge of the extrusion portion 12a protrudes radially outward from the valve core body 1218.

[0171] The flow chamber 1226 may be provided through the portion of the extrusion portion 12a that protrudes from the valve core body 1218, or may be provided on the valve core body 1218. When the flow chamber 1226 is provided on the valve core body 1218, one end of the flow chamber 1226 may extend to the surface of the valve core body 1218 so that the one end of the flow chamber 1226 can be connected to the surface of the sealing portion 1222.

[0172] Such a design introduces the extrusion portion 12a and the valve core body 1218, making it easier for the valve core 121 to push the sealing portion 1222 to open the liquid injection hole 111, thereby improving the convenience of operation.

[0173] According to some embodiments of the present application, please refer to Figure 5, an extrusion groove 12b connected to the flow chamber 1226 is provided on the end face of the extrusion portion 12a facing away from the valve core body 1218, and the cross-sectional area of ​​the extrusion groove 12b gradually decreases from the end of the extrusion groove 12b away from the valve core body 1218 to the end of the extrusion groove 12b close to the valve core body 1218.

[0174] The cross section of the extrusion groove 12b refers to the cross section of the extrusion groove 12b perpendicular to the axis 12c of the valve core 121. Taking Figure 5 as an example, the cross section of the extrusion groove 12b is the cross section indicated by S in Figure 5. The closer the extrusion groove 12b is to the valve core body 1218, the smaller its cross-sectional area is, and it can present a conical design. During the injection process, the electrolyte can be more easily collected in the flow chamber 1226, reducing the residual electrolyte. Of course, the extrusion portion 12a is located at the end of the extrusion groove 12b away from the valve core body 1218, which is equivalent to a fence structure, which can reduce the overflow of the electrolyte.

[0175] With such a design, the extrusion groove 12b is reasonably designed, so that the electrolyte can be more easily collected in the flow cavity 1226 during the injection process, reducing the residual electrolyte; at the same time, one end of the extrusion part 12a plays a fence protection role, reducing the overflow of the electrolyte.

[0176] According to some embodiments of the present application, referring to Figures 13 to 17 , and also to Figures 18 and 19 , a valve cavity 1225 is defined within the valve body 122 , and a valve port 1223 and a flow guide port 1224 are defined on the valve body 122 , both of which are connected to the valve cavity 1225 . The valve port 1223 , the flow cavity 1226 , and the flow guide port 1224 are sequentially connected to form a flow passage.

[0177] The valve cavity 1225 refers to the internal space of the valve body 122. When the injection hole 111 is opened, the valve core 121 is at least partially located within the valve cavity 1225. The valve port 1223 and the guide port 1224 are each connected to the valve cavity 1225. This allows the valve core 121 to act within the valve cavity 1225 through the valve port 1223. At the same time, the guide port 1224 facilitates the entry and exit of the medium into the valve cavity 1225.

[0178] In some examples, the valve core 121 may be partially located within the valve cavity 1225, with the remaining portion extending outside the valve port 1223. Alternatively, the valve core 121 may be completely located within the valve cavity 1225. To improve the reliability of the valve core 121's actuation, the remaining portion of the valve core 121 is extended outside the valve port 1223. In this way, during the exhaust process, the porous plate can drive the valve core 121 to sink relative to the valve body 122, and during the injection process, the injection nozzle can also drive the valve core 121 to sink relative to the valve body 122.

[0179] In some examples, the valve core 121 may include only a valve core body 1218, which is disposed within the valve cavity 1225. A flow chamber 1226 is defined between the outer wall of the valve core body 1218 and the wall of the valve cavity 1225. In some embodiments, the valve core 121 may include, in addition to the valve core body 1218, a plurality of valve core branches 1219. All of the valve core branches 1219 are spaced apart along the circumference of the valve core body 1218 and divide the flow chamber 1226 into a plurality of flow sub-cavities 1227. Specifically, a flow sub-cavity 1227 is defined between the valve core body 1218 and each two adjacent valve core branches 1219.

[0180] The sealing portion 1222 includes a connecting section 12221 and a sealing section 12222. In some embodiments, the connecting section 12221 can be a continuous annular structure having one or multiple flow guide ports 1224 spaced apart along the circumference of the valve body 122. In some embodiments, referring to FIG. 17 , there are multiple connecting sections 12221 spaced apart along the circumference of the valve body 122, with a flow guide port 1224 defined between each two adjacent connecting sections 12221. Each connecting section 12221 can extend along the thickness direction X of the end cap 11 or along the radial direction of the liquid injection hole 111.

[0181] The number of the guide ports 1224 can be one or more and can be set according to specific needs.

[0182] Taking the case where the flow chamber 1226 is not divided into the flow sub-chamber 1227 and there is only one flow guide port 1224 as an example, the valve port 1223, the flow chamber 1226 and the flow guide port 1224 are sequentially connected to form a flow channel. In this embodiment, the one-way valve 12 has only one flow channel.

[0183] Taking the case where the flow chamber 1226 is not divided to form a flow sub-chamber 1227, and there are multiple flow guide ports 1224, which are arranged at circumferential intervals along the valve body 122, as an example, the valve port 1223, the flow chamber 1226 and each flow guide port 1224 are connected in sequence to form a flow channel. In this embodiment, there are multiple flow channels in the one-way valve 12, and all the flow channels share the valve port 1223 and the flow chamber 1226.

[0184] Taking the example of a case where the flow chamber 1226 is divided into flow sub-chambers 1227, and a single flow guide port 1224 extends circumferentially along the valve body 122, the valve port 1223, each flow sub-chamber 1227, and the flow guide port 1224 are sequentially connected to form a flow channel. In this embodiment, the one-way valve 12 has multiple flow channels, and all of the flow channels share the valve port 1223 and the flow guide port 1224.

[0185] Taking the example of the flow chamber 1226 being divided to form a flow sub-chamber 1227, and the flow sub-chamber 1227 corresponding to the flow guide port 1224 one-to-one, the valve port 1223, the flow sub-chamber 1227 and the flow guide port 1224 corresponding to the flow sub-chamber 1227 are connected in sequence to form a flow channel. In this embodiment, there are multiple flow channels in the one-way valve 12, and all the flow channels only share the valve port 1223.

[0186] With this design, the valve port 1223, the flow chamber 1226, and the guide port 1224 are always connected to form a flow channel. When the valve core 121 is subjected to an external force and the sealing portion 1222 is deformed and separated from the end cap 11 to form a flow port, the flow channel is directly connected to the flow port to facilitate subsequent exhaust and liquid injection.

[0187] According to some embodiments of the present application, please refer to Figures 20 to 24. A valve cavity 1225 is provided in the valve body 122, and a valve port 1223 and a guide port 1224 both connected to the valve cavity 1225 are provided on the valve body 122; the valve core 121 is at least partially installed in the valve cavity 1225, and a flow channel structure 1214 is provided in the valve core 121, and a flow channel is formed when the flow channel structure 1214 is connected to the guide port 1224.

[0188] The flow channel structure 1214 refers to a structure that allows the medium to flow inside the valve core 121. The flow channel structure 1214 in the valve core 121 can be one or more, and the guide port 1224 on the valve body 122 can be one or more. Taking the case where there is one flow channel structure 1214 in the valve core 121 and one guide port 1224 on the valve body 122 as an example, when the flow channel structure 1214 is connected with the guide port 1224, an overflow channel is formed. In this embodiment, there is only one overflow channel in the one-way valve 12. Taking the case where there is one flow channel structure 1214 in the valve core 121 and there are multiple guide ports 1224 on the valve body 122 as an example, please refer to Figure 21. 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 guide port 1224 to form an overflow channel. In this embodiment, the one-way valve 12 has multiple flow passages, and all of them share the same flow passage structure 1214. For example, the flow passage structures 1214 within the valve core 121 are multiple, and the flow guide port 1224 on the valve body 122 is a single flow guide port 1224. For example, the flow guide ports 1224 are arranged continuously along the circumference of the connecting section 12221. All of the flow passage structures 1214 are arranged at intervals along the circumference of the valve core 121, and when each flow passage structure 1214 is connected to the same flow guide port 1224, a flow passage is formed. In this embodiment, the one-way valve 12 has multiple flow passages, and all of them share the same flow guide port 1224. Taking the example of a plurality of flow channel structures 1214 within the valve core 121 and a plurality of flow guide ports 1224 on the valve body 122, all flow channel structures 1214 are spaced apart along the circumference of the valve core 121, and the flow guide ports 1224 are spaced apart along the circumference of the valve body 122, corresponding one-to-one with all flow channel structures 1214. Each flow channel structure 1214 communicates with a corresponding flow guide port 1224 to form a flow passage. In this embodiment, the one-way valve 12 has multiple flow passages, and each flow passage is independently arranged.

[0189] With such a design, when the valve core 121 is not subjected to 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 subjected to 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 under the action of an external force to the flow channel structure 1214 and connects with the guide port 1224 to form a flow channel. Under this design, when the valve core 121 is not subjected to an external force, the flow channel structure 1214 and the guide port 1224 fail to connect to form a flow channel, and the one-way valve 12 itself has high sealing and excellent sealing performance.

[0190] According to some embodiments of the present application, referring to FIG. 23 , a valve core cavity 1213 is defined within the valve core 121, and a flow channel opening 1212 and a valve core opening 1211 are defined 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 sequentially connected to form a flow channel structure 1214.

[0191] The valve core opening 1211, valve core cavity 1213, and flow channel opening 1212 each constitute a portion of the flow channel structure 1214. The valve core opening 1211 and flow channel opening 1212 are structures for allowing medium to enter or exit the valve core cavity 1213, respectively. In some examples, the valve core 121 includes a first valve core segment 1215, a second valve core segment 1216, and a third valve core segment 1217. The first valve core segment 1215, the second valve core segment 1216, and the third valve core segment 1217 are arranged sequentially along the thickness direction X of the end cover 11, and the second valve core segment 1216 is connected between the first valve core segment 1215 and the third valve core segment 1217. The first valve core segment 1215 is annular, and the valve core opening 1211 is defined on the end surface of the first valve core segment 1215 away from the third valve core segment 1217. The first valve core segment 1215, the second valve core segment 1216, and the third valve core segment 1217 enclose a valve core cavity 1213, and the flow guide port 1224 is defined by the second valve core segment 1216. The second valve core segment 1216 can be a continuous annular structure having one or multiple flow passages 1212 defined therein and spaced circumferentially along the valve core 121. In some embodiments, there are multiple second valve core segments 1216 spaced circumferentially along the valve core 121, with a flow passage 1212 defined between each adjacent second valve core segment 1216. Each second valve core segment 1216 extends along the thickness direction X of the end cap 11.

[0192] With this design, the flow channel structure 1214 is independently provided within the valve core 121. Simply by providing the flow guide port 1224 on the valve body 122, the flow channel 1214 can be connected to the flow guide port 1224 to form a flow passage. This arrangement helps simplify the structure of the valve body 122 and the valve core 121, reducing the manufacturing cost of the one-way valve 12.

[0193] According to some embodiments of the present application, 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 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 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.

[0194] In this embodiment, when the valve core 121 acts on the valve body 122 , each flow channel structure 1214 shares a valve port 1223 of the valve body 122 .

[0195] With this design, the valve core cavity 1213 is divided into a plurality of valve core sub-cavities 1213 a by designing the second valve core segment 1216 , which is simple and easy to operate and facilitates the formation of the flow channel structure 1214 .

[0196] According to some 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.

[0197] In some examples, the second valve core segment 1216 extends along the thickness direction X of the end cap 11, and a guide port 1224 is formed between each adjacent second valve core segment 1216. In this embodiment, the valve core port 1211, the valve core cavity 1213, and each guide port 1224 are sequentially connected to form a flow channel structure 1214. The one-way valve 12 has multiple flow channel structures 1214, and all flow channel structures 1214 share the valve core port 1211 and valve core cavity 1213.

[0198] This design facilitates simplifying the structure of the valve core 121 and reducing the manufacturing cost of the one-way valve 12 .

[0199] According to some embodiments of the present application, the one-way valve 12 further includes a sealing ring 123, which is sleeved on the outside of the valve core 121. The sealing ring 123 is configured to seal with the end of the injection hole 111 facing away from the sealing portion 1222 when the sealing portion 1222 is separated from the end cover 11.

[0200] The sealing ring 123 is designed to seal against one end of the liquid injection hole 111 when the liquid injection hole 111 is opened. This allows the end of the liquid injection hole 111 near the sealing portion 1222 to be opened, while the end away from the sealing portion 1222 is subsequently sealed by the sealing ring 123. This reduces the probability of leakage during liquid injection or formation and exhaust, thereby reducing the risk of contamination of the battery 1000. The sealing ring 123 can be made of various materials, such as, but not limited to, rubber and plastic.

[0201] In some examples, the valve core 121 includes a valve core body 1218 and an extrusion portion 12a disposed on the valve core body 1218. The extrusion portion 12a protrudes radially out of the valve core body 1218. The sealing ring 123 is sleeved on the valve core body 1218 and is disposed on a side of the extrusion portion 12a facing the sealing portion 1222.

[0202] With this design, a rubber ring is introduced to seal one end of the liquid injection hole 111 during liquid injection or gas formation, thereby reducing the probability of leakage during liquid injection or gas formation and improving the reliability of the battery 1000.

[0203] According to some embodiments of the present application, the valve body 122 further includes a fixing portion 1221 , which is used to be 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 .

[0204] The fixing portion 1221 is a structure that connects to and seals the end cap 11 and is closer to the outer end surface 113 of the end cap 11 than the sealing portion 1222. Referring to Figures 15 to 17, the fixing portion 1221 is fixed to the end cap 11. Regardless of whether external forces act on the valve core 121, the fixing portion 1221 remains in a fixed position relative to the end cap 11. The fixing portion 1221 can be located within the injection hole 111 and engage with the wall of the injection hole 111; alternatively, the fixing portion 1221 can be located on the side of the end cap 11 facing away from the interior of the housing 20 and abut against the outer end surface 113 of the end cap 11.

[0205] It is worth mentioning that in order to reduce the risk of electrolyte leakage, during the injection process, the injection sleeve of the injection nozzle should also seal the fixed part 1221 at the same time, so as to reduce the possibility of electrolyte overflowing from the gap between the injection sleeve of the injection nozzle and the fixed part 1221.

[0206] After the one-way valve 12 is assembled, the battery cell 100 is always sealed with the end cover 11, and the sealing section 12222 is selectively sealed with or disconnected from the end cover 11. In addition, it is worth mentioning that when the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the valve core 121 and the fixing portion 1221 can also be sealed or spaced apart. For example, taking Figures 6 and 7 as an example, when the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the valve core 121 and the fixing portion 1221 are also sealed. For another example, when the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the valve core 121 and the fixing portion 1221 are spaced apart.

[0207] In some examples, the sealing portion 1222 includes a sealing section 12222 and a connecting section 12221. The fixing portion 1221 and the end cover 11 can be sealed by means of an inclined surface seal and / or a flat surface seal. An inclined surface seal means that the surfaces that seal between the fixing portion 1221 and the end cover 11 are both inclined surfaces. An inclined surface refers to a surface structure that is inclined relative to the thickness direction X of the end cover 11. A flat surface seal means that the surfaces that seal between the fixing portion 1221 and the end cover 11 are both flat surfaces. A flat surface 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 an inclined surface seal and / or a flat surface seal.

[0208] The sealing between the fixing portion 1221 and the end cap 11 can be achieved in a variety of ways. For ease of understanding, using Figure 15 as an example, the surface of the fixing portion 1221 facing the end cap 11 includes a first sealing area 12211 and a second sealing area 12212. The first sealing area 12211 is arranged around the periphery of the second sealing area 12212 and is arranged and connected along the thickness direction X of the end cap 11. The first sealing area 12211 is an annular plane, and the second sealing area 12212 is an annular inclined surface. The first sealing area 12211 is planarly sealed with the outer end surface 113 of the end cap 11, while the second sealing area 12212 is sealed with the inclined surface of the wall of the injection hole 111. The sealing section 12222 is located within the accommodating cavity, and the surface of the sealing section 12222 facing the end cap 11 is planarly sealed with the inner end surface 112 of the end cap 11.

[0209] In other examples, taking Figure 16 as an example, 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. Taking Figure 17 as an example, the sealing method of the fixing portion 1221 and the end cover 11 in Figure 17 is the same as the sealing method of the fixing portion 1221 and the end cover 11 in Figure 16, so it will not be repeated here. In Figures 16 and 17, 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 the exhaust or injection is completed, the connecting section 12221 resumes its deformation, and the sealing section 12222 is sealed with the inclined surface of the hole wall of the injection hole 111 again.

[0210] 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. Thus, designing the sealing portion 1222 and the fixing portion 1221 as elastic components and integrally provided helps simplify the structure of the valve body 122, thereby significantly reducing the manufacturing cost of the one-way valve 12.

[0211] With such a design, when the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the sealing performance between the one-way valve 12 and the end cover 11 is improved, thereby greatly reducing the possibility of medium exchange between the external environment and the internal environment of the battery cell 100. The internal environment of the battery cell 100 is minimally affected by the external environment, has a good water-proof effect, high liquid injection efficiency, and a low risk of electrolyte leakage.

[0212] According to some embodiments of the present application, referring to FIG. 16 , a bayonet 123 is formed between the fixing portion 1221 and the sealing portion 1222 , and the bayonet 123 is used to be snapped into the hole wall of the liquid injection hole 111 .

[0213] The bayonet 123 refers to a structure that can realize the snap connection between the hole wall of the liquid injection hole 111 and the valve body 122. It has two inner walls arranged opposite to each other. When the hole wall of the liquid injection hole 111 is snapped into the bayonet 123, the two inner walls respectively abut against the upper and lower ends of the liquid injection hole 111.

[0214] In some examples, the sealing portion 1222 includes a sealing segment 12222 and a connecting segment 12221 . The fixing portion 1221 is connected to the connecting segment 12221 , and a bayonet 123 is formed between the fixing portion 1221 , the connecting segment 12221 , and the sealing segment 12222 .

[0215] With such a design, by providing the bayonet 123 , the end cover 11 and the valve body 122 are easily assembled and tightly fitted, which helps to improve the sealing performance between the valve body 122 and the end cover 11 .

[0216] According to some embodiments of the present application, the excess flow channels include a plurality of excess flow channels, all of which are arranged at intervals around the outer circumference of the valve core 121 and are all connected to the excess flow port.

[0217] The flow channels may be independently arranged, or may partially overlap with each other, which is not specifically limited here.

[0218] With such a design and the provision of multiple flow channels, the battery cells 100 can be quickly vented or injected with liquid, further improving production efficiency.

[0219] According to some embodiments of the present application, please refer to Figure 4. The present application provides an end cover assembly 10, which includes: an end cover 11, which has an injection hole 111 extending through it along its thickness direction X; and a one-way valve 12 like any of the above items, wherein the valve body 122 is assembled in the injection hole 111.

[0220] The end cover assembly 10 provided in this application has the effects brought about by any of the above-mentioned embodiments, so it will not be described in detail here.

[0221] According to some embodiments of the present application, referring to FIG. 5 , a sealing protrusion 114 is provided on the end cap 11 . The sealing protrusion 114 extends around the periphery of the liquid injection hole 111 , and the sealing protrusion 114 abuts against the sealing portion 1222 .

[0222] The sealing protrusion 114 is an annular structure extending around the outer circumference of the injection hole 111. When the sealing portion 1222 is installed in the injection hole 111, the sealing protrusion 114 abuts against the sealing portion 1222, pre-stressing the sealing portion 1222. Furthermore, the annular arrangement of the sealing protrusion 114 around the outer circumference of the injection hole 111 effectively extends the axial length of the injection hole 111, allowing for the installation of a larger one-way valve 12. Furthermore, the sealing protrusion 114 also forms a sealing contact with the sealing portion 1222, further enhancing the sealing performance.

[0223] With this design, a sealing protrusion 114 is provided on the outer periphery of the liquid injection hole 111, so that the sealing portion 1222 is in a pre-stressed state after assembly; at the same time, the axial length of the liquid injection hole 111 is effectively extended, and the installation stability of the valve body 122 in the liquid injection hole 111 is improved.

[0224] According to some embodiments of the present application, 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 own thickness direction X; a valve body 122, which is assembled in the injection hole 111, and includes a sealing portion 1222, the sealing portion 1222 is used to seal with the injection hole 111, and the valve body 122 is used to define a flow channel for communicating with the outside between the valve core 121; wherein the sealing portion 1222 is configured to deform under the action of external force and separate from the end cover 11 to form a flow port, and the flow port is connected to the flow channel.

[0225] The sealing portion 1222 is an elastic component, such as a rubber material, which, under the action of an external force, separates from the end cap 11 by deforming, such as by contracting or stretching, to form a flow port. When the external force is removed, the sealing portion 1222 automatically recovers its deformation and re-engages with the end cap 11. It should be noted that when the external force is removed, a certain preload is applied between the sealing portion 1222 and the end cap 11, so that the rebound force of the sealing portion 1222 provides a sealing force, thereby improving the sealing effect on the injection hole 111.

[0226] Exemplarily, the sealing portion 1222 can achieve a sealed fit between the sealing portion 1222 and the end cover 11 by abutting against the hole wall of the liquid injection hole 111. In this embodiment, a flow outlet is formed when the sealing portion 1222 is separated from the hole wall of the liquid injection hole 111; and / or, the sealing portion 1222 can also achieve a sealed fit between the sealing portion 1222 and the end cover 11 by being received in the internal environment of the battery cell 100 and abutting against the inner end surface 112 of the end cover 11. In this embodiment, a flow outlet is formed when the sealing portion 1222 is separated from the inner end surface 112 of the end cover 11.

[0227] It is worth mentioning that the sealing portion 1222 of this embodiment can be the sealing portion 1222 in any of the above embodiments, and will not be described in detail here. At the same time, when the injection hole 111 is opened, the sealing portion 1222 is deformed by external force and separated from the end cover 11 to form a flow port. There are many ways to act on the sealing portion 1222, such as: using the valve core 121 in any of the above embodiments, at least partially fitting the valve core 121 on the sealing portion 1222, and driving the sealing portion 1222 to deform toward the inside of the battery cell 100. The valve core 121 and the sealing portion 1222 are detachable, so that after the exhaust or injection is completed, the valve core 121 can be removed from the valve body 122.

[0228] With this design, by providing a one-way valve 12 at the injection hole 111 of the end cover 11 , the external impact on the internal environment of the battery cell 100 during the production of the battery 1000 can be effectively reduced, thereby improving the water-proof effect and injection efficiency of the battery cell 100 .

[0229] According to some embodiments of the present application, the present application provides a battery cell 100 , and the battery cell 100 includes any one of the above end cap assemblies 10 .

[0230] According to some embodiments of the present application, the present application provides a battery 1000 including the above battery cell 100 .

[0231] According to some embodiments of the present application, the present application provides an electrical device, including the above battery 1000, and the battery 1000 is used to provide electrical energy to the electrical device.

[0232] According to some embodiments of the present application, please refer to Figures 1 to 24. The present application provides an end cover assembly 10, which includes an end cover 11 and a one-way valve 12. The end cover 11 is provided with an injection hole 111 along its own thickness direction X. The one-way valve 12 includes a valve core 121 and a valve body 122. The valve body 122 is assembled in the injection hole 111 and includes a sealing portion 1222. The sealing portion 1222 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 external force to separate from the end cover 11 to form a flow port, and the flow port is connected to the flow channel.

[0233] It can be seen that in the present application, when the valve core 121 is not subject to external force, the sealing portion 1222 is sealed with the end cover 11 and blocks the flow channel and the internal environment of the battery cell 100. In this way, there is no possibility of medium exchange between the outside and the internal environment of the battery cell 100, that is, no exhaust or injection is possible. The internal environment of the battery cell 100 is minimally affected by the outside, and the water barrier effect is good. Therefore, there is no need to evacuate the battery cell 100 in the subsequent injection process, and the injection efficiency is high. When the valve core 121 is subject to external force, the sealing portion 1222 separates from the end cover 11 and forms a flow port, which is connected to the flow channel. Therefore, the water vapor formed by the evaporation of water in the electrode assembly 30 can be discharged to the outside through the flow port and the flow channel to achieve exhaust. In addition, the electrolyte can also flow into the internal environment of the battery cell 100 through the flow channel and the flow port and achieve injection. Therefore, by providing a one-way valve 12 at the injection hole 111 of the end cover 11, the external impact on the internal environment of the battery cell 100 during the production of the battery 1000 can be effectively reduced, thereby improving the water isolation effect and injection efficiency of the battery cell 100.

[0234] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

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

2. The one-way valve according to claim 1, wherein: The one-way valve further comprises abutment member (1a), the abutment member (1a) being used to be arranged on the end cover (11), and the abutment member (1a) abuts against a side of the valve body (122) facing away from the valve core (121), so that the sealing portion (1222) and the injection hole (111) are sealed and matched.

3. The one-way valve according to claim 2, wherein: The abutment member (1a) covers the sealing portion (1222), and a portion of the inner wall of the abutment member (1a) abuts against the sealing portion (1222).

4. The one-way valve according to claim 3, wherein: A deformation recess (1c) is formed inwardly on a side surface of the sealing portion (1222) facing away from the valve core (121), and a portion of the sealing portion (1222) located on the periphery of the deformation recess (1c) abuts against an inner wall of the abutment member (1a).

5. The one-way valve according to claim 3 or 4, wherein: The abutment member (1a) is provided with a first through hole (1a4) extending therethrough, and the first through hole (1a4) is configured to allow the sealing portion (1222) to be deformed at least partially along a side away from the valve core (121).

6. The one-way valve according to any one of claims 3 to 5, wherein: The abutment member (1a) comprises a cover body portion (1a1) and an edge portion (1a2) arranged on the outer edge of the cover body portion (1a1), the cover body portion (1a1) has a covering cavity (1a3), the edge portion (1a2) is used to be arranged on the end cover (11), the covering cavity (1a3) covers one end of the valve body (122) facing away from the valve core (121), and the cavity wall of the covering cavity (1a3) abuts against the valve body (122).

7. The one-way valve according to any one of claims 3 to 6, wherein: The abutment member (1a) is penetrated by a first through hole (1a5), and the outflow direction of the medium in the first through hole (1a5) intersects with the direction of the axis (12c) of the valve core (121).

8. The one-way valve according to any one of claims 2 to 7, wherein: The one-way valve further comprises an insulating cover (1b), wherein the insulating cover (1b) is disposed on the abutment member (1a).

9. The one-way valve according to any one of claims 1 to 8, wherein: The sealing portion (1222) includes a connecting section (12221) for penetrating the liquid injection hole (111), and a sealing section (12222) connected to the connecting section (12221); the sealing section (12222) and / or the connecting section (12221) are used for sealing cooperation with the liquid injection hole (111), and the valve core (121) is at least partially cooperated with the connecting section (12221).

10. The one-way valve according to claim 9, wherein: The connecting section (12221) and the valve core (121) are an integrated structure; or, The connecting section (12221) is detachably connected to the valve core (121).

11. The one-way valve according to claim 9, wherein: One of the connecting section (12221) and the valve core (121) is provided with a buckle groove (1c3), and the other is provided with a buckle protrusion (1c4) that matches the buckle groove (1c3).

12. The one-way valve according to any one of claims 9 to 11, wherein: The circumferential portion of the sealing section (12222) radially protrudes outside the connecting section (12221), the circumferential portion of the sealing section (12222) is used to abut against the end cover (11), and the connecting section (12221) is used to seal and fit with the hole wall of the injection hole (111).

13. The one-way valve according to any one of claims 9 to 11, wherein: A drainage channel (1c2) is provided on a surface of the sealing section (12222) facing the connecting section (12221), and the flow outlet is connected to the drainage channel (1c2).

14. The one-way valve according to any one of claims 1 to 13, wherein: The valve core (121) is provided with a flow chamber (1226), and the flow chamber (1226) extends along the axis (12c) of the valve core (121) to the surface leading to the sealing portion (1222), and the flow chamber (1226) and the surface of the sealing portion (1222) define the flow channel.

15. The one-way valve according to claim 14, wherein: The flow chamber (1226) is arranged on the side of the valve core (121) around its own axis (12c); and / or the flow chamber (1226) is arranged inside the valve core (121).

16. The one-way valve according to claim 15, wherein: The valve core (121) includes a valve core body (1218) and an extrusion portion (12a) connected to the valve core body (1218), wherein the extrusion portion (12a) protrudes from the valve core body (1218) in the radial direction of the valve core (121), and the flow chamber (1226) is provided in the valve core body (1218) and / or the extrusion portion (12a).

17. The one-way valve according to claim 16, wherein: An extrusion groove (12b) connected to the flow chamber (1226) is provided on one end face of the extrusion portion (12a) facing away from the valve core body (1218), and the cross-sectional area of ​​the extrusion groove (12b) gradually decreases from one end of the extrusion groove (12b) away from the valve core body (1218) to one end of the extrusion groove (12b) close to the valve core body (1218).

18. The one-way valve according to claim 14, wherein: A valve cavity (1225) is provided in the valve body (122), and a valve port (1223) and a flow guide port (1224) are provided on the valve body (122), both of which are connected to the valve cavity (1225); the valve port (1223), the flow cavity (1226) and the flow guide port (1224) are connected in sequence to form a flow passage.

19. The one-way valve according to any one of claims 1 to 16, wherein: A valve cavity (1225) is provided in the valve body (122), and a valve port (1223) and a flow guide port (1224) are provided on the valve body (122), both of which are connected to the valve cavity (1225); the valve core (121) is at least partially installed in the valve cavity (1225), and a flow channel structure (1214) is provided in the valve core (121), and the flow channel is formed when the flow channel structure (1214) is connected to the flow guide port (1224).

20. The one-way valve according to claim 19, wherein: A valve core cavity (1213) is provided in the valve core (121), and a flow channel opening (1212) and a valve core opening (1211) are provided on the valve core (121), both of which are connected to the valve core cavity (1213); the valve core opening (1211), the valve core cavity (1213) and the flow channel opening (1212) are connected in sequence and are constructed to form the flow channel structure (1214).

21. The one-way valve according to claim 20, wherein: The valve core (121) comprises a first valve core section (1215), a second valve core section (1216) and a third valve core section (1217), wherein the second valve core section (1216) is connected between the first valve core section (1215) and the third valve core section (1217); The second valve core section (1216) includes at least two, which are intersectingly arranged in the valve core cavity (1213) and divide the valve core cavity (1213) into a plurality of valve core sub-cavities (1213a), and the valve core port (1211) is connected to the valve core sub-cavity (1213a) to form the flow channel structure (1214).

22. The one-way valve according to claim 20, wherein: The valve core (121) comprises a first valve core section (1215), a second valve core section (1216) and a third valve core section (1217), wherein the second valve core section (1216) is connected between the first valve core section (1215) and the third valve core section (1217); The second valve core segments include at least two and are arranged at intervals along the circumference of the valve core (121).

23. The one-way valve according to any one of claims 1 to 22, wherein: The one-way valve further comprises a sealing ring (123), wherein the sealing ring (123) is sleeved outside the valve core (121), and the sealing ring (123) is configured to seal with an end of the liquid injection hole (111) facing away from the sealing portion (1222) when the sealing portion (1222) is separated from the end cover (11).

24. The one-way valve according to any one of claims 1 to 23, wherein: The valve body (122) further comprises a fixing portion (1221), wherein the fixing portion (1221) is used to be 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).

25. An end cap assembly, comprising: The end cover (11) is provided with a liquid injection hole (111) extending through the end cover along its thickness direction (X); According to any one of claims 1 to 24, the valve body (122) is assembled in the liquid injection hole (111).

26. The end cap assembly of claim 25, wherein: A sealing protrusion (114) is convexly provided on the end cover (11), the sealing protrusion (114) extends around the outer circumference of the liquid injection hole (111), and the sealing protrusion (114) abuts against the sealing portion (1222).

27. An end cap assembly, comprising: The end cover (11) is provided with a liquid injection hole (111) extending through the end cover along its thickness direction (X); A valve body (122) is assembled in the liquid injection hole (111) and comprises a sealing portion (1222). The sealing portion (1222) is used to seal with the liquid injection hole (111). 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.

28. A battery cell, comprising the end cap assembly according to any one of claims 25 to 27.

29. A battery comprising the battery cell according to claim 28.

30. An electrical device, comprising the battery as claimed in claim 29, wherein the battery is used to provide electrical energy for the electrical device.

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