Valve body, one-way valve, end cover assembly, battery monomer, battery and electric device

Abstract

The invention relates to a valve body, a one-way valve, an end cover assembly, a battery monomer, a battery and an electric device, when a valve core is not subjected to external force, a sealing part is in sealing fit with a liquid injection hole and blocks an overflowing channel and the internal environment of the battery monomer. Therefore, medium exchange cannot be carried out between the outside and the internal environment of the battery monomer, namely exhausting or liquid injection cannot be carried out, the internal environment of the battery monomer is slightly influenced by the outside, the waterproof effect is good, the battery monomer does not need to be vacuumized in the subsequent liquid injection process, and the liquid injection efficiency is high. When the valve element is subjected to external force, the sealing part is separated from the end cover to form a flow passing opening, and the flow passing opening is communicated with the flow passing channel. Therefore, water vapor formed by evaporation of water in the electrode assembly can be discharged to the outside through the flow passing opening and the flow passing channel so as to realize exhaust.

Description

[0001] Related Applications

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

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

[0004] This application claims priority to Chinese patent application No. 202410371959X, filed on March 28, 2024, and entitled “Valve body, valve assembly, end cover assembly, battery cell, battery and electrical device”, the entire text of which is hereby incorporated by reference. Technical Field

[0005] The present application relates to the field of battery technology, and in particular to a valve body, a one-way valve, an end cover assembly, a battery cell, a battery and an electrical device. Background Art

[0006] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0007] The battery consists of battery cells, which go through exhaust and injection processes in sequence during manufacturing. During the process of switching from the exhaust process to the injection process, the injection hole on the end cover of the battery cell remains open, resulting in a series of problems such as poor water isolation and low injection efficiency in the battery cell, which greatly limits the battery's production capacity. Summary of the invention

[0008] Based on this, it is necessary to provide a valve body, 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 injection hole of an end cover, characterized in that the one-way valve comprises: a valve core; a valve body, which is used to be assembled in the injection hole, and includes a sealing portion, the sealing portion is used to seal with the injection hole, the valve core is matched with the valve body and defines with the valve body to form 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, and the flow port is connected with the flow channel.

[0010] For the one-way valve mentioned above, when the valve core is not subject to external force, the sealing part 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 is impossible. The internal environment of the battery cell is minimally affected by the outside, and the water-proof 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 part separates from the end cover and forms a flow port, which is connected to the flow channel. Therefore, the water vapor formed by the evaporation of water in the electrode assembly can be discharged to the outside through the flow port and the flow channel to achieve exhaust. In addition, the electrolyte can also flow into the internal environment of the battery cell through the flow channel and the flow port and achieve injection. Therefore, by setting a one-way valve at the injection hole of the end cover, the influence of the outside on the internal environment of the battery cell during the battery production process can be effectively reduced, and the water-proof effect and injection efficiency of the battery cell can be improved.

[0011] In some embodiments, the one-way valve further includes an abutment member, which is used to be arranged on the end cover, and the abutment member abuts against the side of the valve body that is away from the valve core, so that the sealing part and the injection hole are sealed. In this design, the abutment member is introduced, so that the sealing part is tightly pressed into the injection hole to achieve effective sealing, so that in the process of being transported from the exhaust station to the injection station, the interior of the battery cell is always sealed, thereby improving the water-proof performance of the battery cell.

[0012] In some embodiments, the abutment covers the sealing portion, and part of the inner wall of the abutment abuts against the sealing portion. With such a design, the edge portion covers the sealing portion, which facilitates better pressing of the sealing portion onto the end cap to achieve more effective sealing.

[0013] In some embodiments, a side of the sealing part facing away from the valve core is provided with a deformable recess, and a portion of the sealing part located outside the deformable recess abuts against an inner wall of the abutment member. With such a design, the deformable recess is introduced to facilitate deformation of the sealing part toward the abutment member, thereby facilitating opening of the injection hole for exhaust or injection operations.

[0014] In some embodiments, a first perforation is provided through the abutment, and the first perforation is configured to allow the sealing part to deform at least partially along the side away from the valve core. With such a design, the first perforation is introduced, and the gap reserved for deformation between the sealing part and the abutment is reduced or eliminated, while allowing the sealing part to deform, thereby reducing interference between structures; at the same time, the demand for the space below the end cover by the one-way valve-related accessories is reduced, and the space occupied by the battery cell is reduced, which is beneficial to improving the energy density of the battery; it also improves the compatibility of the one-way valve structure with different battery cells.

[0015] In some embodiments, the abutment member includes a cover body and an edge portion disposed on the outer edge of the cover body, the cover body has a covering cavity, the edge portion is used to be disposed on the end cover, the covering cavity covers an end of the valve body that is away from the valve core, and the cavity wall of the covering cavity abuts against the valve body. In this design, the abutment member is designed as a cover body and an edge portion, which facilitates the abutment member to cover the sealing portion and be installed on the end cover.

[0016] In some embodiments, a first through hole is formed through the abutment, and the outflow direction of the medium in the first through hole intersects with the axial direction of the valve core. With such a design, the first through hole is introduced, so that during the exhaust or injection process, it is easier for the medium to pass through the abutment, so that the exhaust or injection operation can be carried out more smoothly.

[0017] In some embodiments, the one-way valve further includes an insulating cover, which is disposed on the abutment. With such a design, the insulating cover is introduced to insulate the abutment so that it will not be in electrical contact with components in the battery cell, which is beneficial to improving the reliability of the battery.

[0018] In some embodiments, the sealing portion includes a connecting section for passing through the injection hole and a sealing section connected to the connecting section. The sealing section and / or the connecting section are used to seal with the injection hole, and the valve core at least partially cooperates with the connecting section. With such a design, when exhausting or injecting liquid, the valve core sinks and drives the sealing section to drive the connecting section to stretch, and the sealing section and / or the connecting section sinks and separates from the end cover to form a flow port; after exhausting or injecting liquid, the connecting section restores its deformation, and the sealing portion is sealed with the end cover again.

[0019] In some embodiments, the connecting section and the valve core are an integrated structure. Such a design is conducive to simplifying the structure of the one-way valve, thereby significantly reducing the manufacturing cost.

[0020] In some embodiments, the connection section and the valve core are detachably connected. With such a design, after the exhaust or injection is completed, the valve core can be removed from the connection section, thereby reducing the structure on the end cover, reducing the weight of the battery cell and the space occupied on the end cover.

[0021] In some embodiments, one of the connection section and the valve core is provided with a buckle groove, and the other is provided with a buckle protrusion that matches the buckle groove. Such a design, introducing the buckle protrusion and the buckle groove, facilitates the connection and disassembly of the connection section and the valve core, thereby facilitating the compression deformation of the valve core on the valve body; at the same time, it is convenient to remove the valve core and reduce the structure on the end cover.

[0022] In some embodiments, the circumferential portion of the sealing section radially protrudes outside the connecting section, the circumferential portion of the sealing section is used to abut against the end cover, and the connecting section is used to seal against the hole wall of the injection hole. Such a design facilitates the connecting section to fit closely against the hole wall of the injection hole, thereby improving the sealing effect.

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

[0024] In some embodiments, a first guide surface is provided in the circumferential direction of one end of the connecting section away from the sealing section, and the cross-sectional area A1 of the first guide surface gradually decreases in the direction away from the sealing section. In this design, the first guide surface is provided at the end of the connecting section away from the sealing section, so that when the sealing part reseals the injection hole, it can automatically return to the initial position under the guidance of the first guide surface, thereby reducing the risk of valve closing failure caused by the connection section contacting the hole wall of the injection hole.

[0025] In some embodiments, the valve core is provided with a flow cavity, which extends along the axial direction of the valve core and can lead to the sealing portion, and a flow passage is defined between the flow cavity and the sealing portion. With such a design, the flow cavity is introduced, so that the electrolyte can flow to the sealing portion more easily during the injection process, making the injection operation more convenient.

[0026] In some embodiments, the flow chamber is arranged on the side of the valve core around its own axis; and / or, the flow chamber is arranged inside the valve core. With such a design, the distribution position of the flow chamber is reasonably set, so that the exhaust or injection operation can be carried out stably. With such a design, the distribution position of the flow chamber is reasonably set, so that the exhaust or injection operation can be carried out stably.

[0027] 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. With such a design, the extrusion portion and the valve core body are introduced, which facilitates the valve core to push the sealing portion to open the injection hole, thereby improving the convenience of operation.

[0028] In some embodiments, an end surface of the extrusion portion facing away from the valve core body is provided with an extrusion groove connected to the flow chamber, and 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 close to the valve core body. In this way, the extrusion groove is reasonably designed, so that the electrolyte can be more easily collected in the flow chamber during the injection process, reducing the residual electrolyte; at the same time, one end of the extrusion portion plays a fence protection role to reduce the overflow of the electrolyte.

[0029] In some embodiments, a side of the extrusion part facing away from the valve body is provided with a convex enclosure, which is arranged in an annular manner around the flow cavity. In this design, the enclosure is introduced to reduce the probability of electrolyte overflowing around the extrusion part, so that the injection operation can be carried out stably.

[0030] In some embodiments, a limiting convex portion is provided on one side of the extrusion portion facing the valve body, and the limiting convex portion surrounds the outer periphery of the valve core body and is used to interfere with the end cover. In this design, the limiting convex portion is introduced to limit the stroke of the valve core during the process of the valve core pushing the valve body, thereby reducing the risk of the valve body failing to properly seal the injection hole due to excessive pushing, and improving the structural stability of the one-way valve.

[0031] In some embodiments, a valve cavity is provided in the valve body, and a valve port and a flow guide port are provided on the valve body, both of which are connected to the valve cavity. The valve port, the flow cavity and the flow guide port are connected in sequence to form a flow passage. With such a design, the valve port, the flow cavity and the flow guide port are always connected to form a flow passage. When the valve core is driven by an external force to deform the sealing part and separate from the end cover to form a flow passage, the flow passage is directly connected to the flow passage to facilitate subsequent exhaust and liquid injection.

[0032] In some embodiments, the flow chamber is disposed inside the valve core, and one end of the flow chamber near the sealing portion is configured as a buckle groove; the sealing portion is provided with a buckle protrusion for being buckled in the buckle groove. Such a design, introducing the buckle groove and the buckle protrusion, enables quick disassembly and assembly between the valve core and the sealing portion, which is conducive to improving the convenience of the one-way valve.

[0033] In some embodiments, a resisting convex portion is convexly provided on the inner wall of the buckle groove, and a resisting concave portion is provided on one side of the buckle protrusion, and the resisting convex portion abuts against the inner wall of the resisting concave portion. With such a design, the buckle protrusion and the buckle groove are fastened together through the cooperation of the resisting convex portion and the resisting concave portion, thereby improving the assembly efficiency of the one-way valve.

[0034] In some embodiments, the interfering convex parts include more than two, all of which are spaced around the axis of the valve core, and there is a deformation gap between two adjacent interfering convex parts. In this design, more than two interfering convex parts are provided, which increases the connection points between the buckle groove and the buckle protrusion, and improves the stability of the structural connection; at the same time, the deformation gap is provided between the interfering convex parts, which allows the interfering convex parts to deform during the buckle process, so that the interfering convex parts can be more smoothly stuck in the interfering concave parts.

[0035] In some embodiments, a second guide surface is provided in the circumferential direction of one end of the buckle protrusion away from the sealing part, and the cross-sectional area A2 of the second guide surface gradually decreases in the direction away from the sealing part. In this design, the second guide surface is provided at the end of the buckle protrusion away from the sealing part, so that when the sealing part reseals the injection hole, it can automatically return to the initial position under the guidance of the second guide surface, thereby reducing the risk of valve closing failure caused by the buckle protrusion abutting against the hole wall of the injection hole.

[0036] In some embodiments, a through hole is provided on the side of the valve core, and the through hole is communicated with the flow chamber. In this design, the through hole is provided on the side of the valve core, so that a flow passage is formed between the flow chamber, the through hole and the sealing part, thereby achieving effective exhaust or liquid injection.

[0037] In some embodiments, a drainage channel is provided on the wall of the flow chamber, and the drainage channel extends to the through port along the axis of the valve core. In this design, the drainage channel is provided on the wall of the flow chamber, so that during the injection process, the electrolyte smoothly enters the through port under the action of the drainage channel, thereby achieving stable injection.

[0038] 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 a flow channel is formed. 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 performance and excellent sealing performance.

[0039] In some embodiments, a valve core cavity is provided in the valve core, and a flow channel opening and a valve core opening are provided 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 structured to form a flow channel structure. With such a design, a flow channel structure is independently provided in the valve core, and only a guide opening is required on the valve body, so that the flow channel structure can form a flow passage when connected to the guide opening. This arrangement is conducive to simplifying the structure of the valve body and the valve core, and reducing the manufacturing cost of the one-way valve.

[0040] In some embodiments, the valve core includes a first valve core section, a second valve core section and a third valve core section, 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, and they are intersectingly arranged in the valve core cavity and divide the valve core cavity into a plurality of valve core sub-cavities, and the valve core port is connected to the valve core sub-cavity to form a flow channel structure. In this design, the method of dividing the valve core cavity into a plurality of valve core sub-cavities by designing the second valve core section is simple and easy to operate, and is convenient for forming the flow channel structure.

[0041] In some embodiments, the valve core includes a first valve core section, a second valve core section and a third valve core section, 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 and is arranged at intervals along the circumference of the valve core. With such a design, a rubber ring is introduced to seal with one end of the injection hole during injection or formation exhaust, thereby reducing the probability of leakage during injection or formation exhaust and improving the reliability of the battery.

[0042] In some embodiments, the one-way valve further includes a sealing ring, which is sleeved outside the valve core, and the sealing ring is configured to seal with at least one end of the injection hole facing away from the sealing portion when the sealing portion is separated from the end cover. This design facilitates simplifying the valve core structure and reducing the manufacturing cost of the one-way valve.

[0043] In some embodiments, the two ends of the sealing ring along the axial direction of the valve core include a first end and a second end, the first end abuts against the valve core, and the second end is used to abut against an end of the injection hole facing away from the sealing portion, and the wall thickness h of the sealing ring decreases from the first end to the second end. In this design, the wall thickness of the sealing ring is designed to be thinner as it approaches the second end, so that abutment deformation occurs, so that the valve core continues to smoothly push open the sealing portion.

[0044] In some embodiments, the sealing ring includes a first channel and a second channel distributed along the axial direction of the valve core and sleeved outside the valve core, the second channel is closer to the sealing portion than the first channel, and there is a gap between the inner wall of the second channel and the side of the valve core. With such a design, there is a gap between the inner wall of the second channel and the valve core, so that the valve core is not easy to fit on the inner wall of the second channel when it is squeezed and deformed, so that the injection or exhaust can be carried out stably.

[0045] In some embodiments, the distance between the inner wall of the second channel and the side of the valve core gradually increases from the end of the second channel close to the first channel to the end of the second channel away from the first channel. With such a design, the part of the valve core closer to the sealing portion has a larger space for deformation, which can not only meet the requirement of opening the sealing portion, but also reduce the risk of the flow passage being blocked.

[0046] 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 in sealing cooperation with the end cover. In such a design, when the fixing portion and the sealing section are both in sealing cooperation with the end cover, the sealing performance between the one-way valve and the end cover is improved, thereby greatly reducing the possibility of medium exchange between the outside and the internal environment of the battery cell, the internal environment of the battery cell is minimally affected by the outside, the water-proof effect is good, the injection efficiency is high, and the risk of electrolyte leakage is low.

[0047] In a second aspect, the present application provides a valve body for being assembled in the injection hole of the end cover, comprising: a sealing portion, the sealing portion being used to seal and cooperate with the injection hole, the sealing portion being used to define a portion of the sealing portion located in the injection hole to form a flow channel for communicating with the outside; 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.

[0048] In some embodiments, a deformation recess is formed inwardly on one side of the sealing portion, and the portion of the sealing portion located at the periphery of the deformation recess is used to abut against the abutment of the end cover. With such a design, the deformation recess is introduced to facilitate the deformation of the sealing portion toward the abutment, thereby facilitating the opening of the injection hole for exhaust or injection operations.

[0049] In some embodiments, the sealing portion includes a connecting section for passing through the injection hole and a sealing section connected to the connecting section, and the sealing section and / or the connecting section are used to seal with the injection hole. With such a design, when exhausting or injecting liquid, the valve core sinks and drives the sealing section to stretch the connecting section, and the sealing section and / or the connecting section sinks and separates from the end cover to form a flow port; after exhausting or injecting liquid, the connecting section restores its deformation, and the sealing portion is sealed with the end cover again.

[0050] In some embodiments, a first guide surface is provided in the circumferential direction of one end of the connecting section away from the sealing section, and the cross-sectional area A1 of the first guide surface gradually decreases in the direction away from the sealing section. In this design, the first guide surface is provided at the end of the connecting section away from the sealing section, so that when the sealing part reseals the injection hole, it can automatically return to the initial position under the guidance of the first guide surface, thereby reducing the risk of valve closing failure caused by the connection section contacting the hole wall of the injection hole.

[0051] In some embodiments, the sealing portion further includes a fixing portion, which is disposed around the outer periphery of the connecting section and is spaced apart from the sealing section, and the fixing portion is used to seal with the injection hole. With such a design, when both the fixing portion and the sealing section are sealed with the end cover, the sealing performance between the one-way valve and the end cover is improved, thereby greatly reducing the possibility of medium exchange between the outside and the internal environment of the battery cell, the internal environment of the battery cell is minimally affected by the outside, the water-proof effect is good, the injection efficiency is high, and the risk of electrolyte leakage is low.

[0052] In some embodiments, the fixing portion, the connecting section and the sealing section are enclosed to form a bayonet, which is used to clamp the hole wall of the injection hole. With such a design, by setting the bayonet, the end cover and the valve body are easy to assemble and fit tightly, which helps to improve the sealing performance between the valve body and the end cover.

[0053] In some embodiments, a flow guide hole is provided on the fixing portion, and a connection groove connected to the flow guide hole is provided on the surface of the connection section, and the flow guide hole and the connection groove together form a flow passage. Through the above structure, the flow passage can be smoothly realized, and through the connection between the connection groove and the flow passage, the flow passage and the flow passage can be smoothly connected, thereby realizing the exhaust or liquid injection process of the battery cell.

[0054] In some embodiments, the flow guide hole includes at least two sub-holes, each of which is arranged at intervals along the circumference of the fixing portion, and all of the sub-holes are connected to the connecting groove. Thus, each sub-hole can form a flow passage with the connecting groove, and when the sealing section and the hole wall are separated to form a flow port, multiple flow passages are respectively connected to the flow port, thereby realizing the exhaust or injection process at the same time, which can effectively improve the exhaust efficiency or injection efficiency.

[0055] In some embodiments, the valve body has a valve closing position and a valve opening position. When the valve body is in the valve closing position, the fixing portion and the sealing section are both sealed with the hole wall of the injection hole; when the valve body is in the valve opening position, the fixing portion is sealed with the hole wall of the injection hole, and the sealing section is separated from the hole wall of the injection hole to form a flow port. Thus, an external force is applied to the valve body to switch the valve body to the valve opening position, and when the external force is removed, the valve body can be switched to the valve closing position in time under the action of its own elastic potential energy, thereby achieving flexible and timely sealing of the valve body and improving the water-isolating effect of the valve body.

[0056] In some embodiments, the sealing section includes a first surface and a second surface sequentially arranged along a preset direction, the first surface is connected to the connecting section and is parallel to the preset direction, one end of the second surface is connected to the first surface, and the other end is inclined toward the direction of the hole wall close to the injection hole; wherein the first surface is used for interference fit with the hole wall of the injection hole, and the second surface is used for abutting against the hole wall of the injection hole, and the preset direction is configured as the direction in which the valve body is inserted into the injection hole. Thus, through the above structure, the first surface and the second surface are respectively sealed with the end cover, thereby realizing double sealing between the valve body and the end cover, and improving the sealing effect.

[0057] In some embodiments, a valve cavity is provided in the valve body, and the valve cavity is used to accommodate a force-applying member that provides external force. By providing a valve cavity that can accommodate the force-applying member, it is convenient to apply external force to the sealing part through the force-applying member, thereby causing the sealing part to deform and separate from the hole wall to form a flow port.

[0058] In some embodiments, the valve body is provided with a valve port and a flow guide port both connected to the valve cavity, and the valve port is used for inserting the force-applying member into the valve cavity. In this design, the valve port, the flow cavity and the flow guide port are always connected, and when the sealing portion is deformed and separated from the end cover by an external force to form a flow port, the flow channel is directly connected to the flow port to facilitate subsequent exhaust and liquid injection.

[0059] In some embodiments, the valve cavity has a first cavity and a second cavity that are interconnected, the first cavity is arranged on the valve port side of the valve cavity, and the second cavity is arranged on the bottom wall side of the valve cavity; wherein the diameter of the first cavity is smaller than the diameter of the second cavity. Through the above structure, the valve core can be more stably inserted into the valve body, so that the valve core and the valve body are stably connected, which facilitates the valve core to drive the valve body to move smoothly, and realizes the smooth opening and closing of the valve assembly.

[0060] In a third aspect, the present application provides an end cover assembly, comprising: 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, wherein the valve body is assembled in the injection hole.

[0061] In a fourth aspect, the present application provides an end cover assembly, comprising: an end cover having an injection hole extending therethrough along the thickness direction thereof; and a valve body such as any of the above items, the valve body being assembled in the injection hole.

[0062] In some embodiments, a sealing protrusion is convexly provided on the end cover, the sealing protrusion extends around the outer circumference of the injection hole, and the sealing protrusion abuts against the sealing portion.

[0063] In a fifth aspect, the present application provides a battery cell, the battery cell comprising any one of the above end cover assemblies.

[0064] In a sixth aspect, the present application provides a method for preparing a battery cell, the method comprising the following steps: assembling the valve body in the injection hole from one side of the end cover along its own thickness direction, and making the valve body at least partially seal with the hole wall of the injection hole; inserting the valve core into the injection hole from the other side of the end cover along its own thickness direction, and matching it with the valve body; sealing the end cover on the shell of the battery cell; pressing the valve core to drive the valve body to deform and separate from the end cover to complete the exhaust or injection operation.

[0065] Such a design, by arranging a valve body and a valve core at the injection hole of the end cover, can effectively reduce the external impact on the internal environment of the battery cell during the battery production process, and improve the water isolation effect and injection efficiency of the battery cell.

[0066] In some embodiments, the method further comprises the following steps: after the injection operation is completed, the valve core is removed from the end cover; the buckle protrusion of the valve body located in the injection hole is cut off, and the end of the injection hole facing away from the shell is sealed. In this design, the valve body is retained as a sealing structure, the structure is reused, and the water-proof performance of the battery cell is improved.

[0067] In a seventh aspect, the present application provides a battery, comprising the battery cell as described above.

[0068] In an eighth aspect, the present application provides an electrical device, comprising a battery as described above, and the battery is used to provide electrical energy to the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present application. Also, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0070] Figure 1 This is a schematic diagram of the structure of a vehicle in some embodiments of the present application.

[0071] Figure 2 This is an exploded view of a battery in some embodiments of the present application.

[0072] Figure 3 This is a schematic diagram of the structure of a battery cell in some embodiments of the present application.

[0073] Figure 4 It is a schematic structural diagram of the end cover assembly in the first embodiment of the present application.

[0074] Figure 5 for Figure 4 A cross-sectional view of the structure of the end cap assembly is shown in FIG.

[0075] Figure 6 for Figure 4 Schematic diagram of the structural explosion of the end cap assembly shown in.

[0076] Figure 7 It is a schematic structural diagram of the end cover assembly in the second embodiment of the present application.

[0077] Figure 8 for Figure 7 A cross-sectional view of the structure of the end cap assembly is shown in FIG.

[0078] Fig. 9 It is a schematic structural diagram of the end cover assembly in the third embodiment of the present application.

[0079] Fig.10 for Fig. 9 A cross-sectional view of the structure of the end cap assembly is shown in FIG.

[0080] Fig.11 for Fig.10 Schematic diagram of the structure of the abutment shown in FIG.

[0081] Fig.12 for Figure 7 Schematic diagram of the structural explosion of the end cap assembly shown in.

[0082] Fig.13 for Fig. 9 Schematic diagram of the structural explosion of the end cap assembly shown in.

[0083] Fig.14 It is a schematic structural diagram of the end cover assembly in the fourth embodiment of the present application.

[0084] Fig.15 This is a schematic structural diagram of the end cover assembly in the fifth embodiment of the present application.

[0085] Fig.16 for Fig.14The end cap assembly is shown in cross-section along the AA direction.

[0086] Fig.17 for Fig.15 The end cap assembly is shown in a cross-sectional view along direction BB.

[0087] Fig.18 It is a schematic diagram of the structure of the one-way valve in the end cover assembly in the sixth embodiment of the present application.

[0088] Fig.19 for Fig.18 The cross-sectional view of the one-way valve along the CC direction is shown.

[0089] Fig. 20 for Fig.18 A top view of the one-way valve is shown.

[0090] Fig.21 for Fig.14 A schematic diagram of the structure of the one-way valve in the end cover assembly is shown.

[0091] Fig. 22 for Fig.21 Exploded view of a check valve is shown.

[0092] Fig.23 for Fig. 22 A schematic diagram of the structure of the valve core in the one-way valve shown.

[0093] Fig.24 for Fig.15 Exploded view of the check valve in the end cap assembly shown.

[0094] Fig.25 for Fig.24 The structural schematic diagram of the one-way valve is shown.

[0095] Fig.26 This is a structural explosion diagram of the one-way valve in the seventh embodiment of the present application.

[0096] Fig. 27 for Fig.26 A cross-sectional view of the structure of a one-way valve is shown in FIG.

[0097] Fig.28 for Fig.26 Schematic diagram of the valve core structure in a one-way valve shown in FIG.

[0098] Fig.29 for Fig.26 A partial cross-sectional view of the structure showing the one-way valve assembled in the end cover.

[0099] Fig.30 for Fig.26 The cross-sectional view of the structure of the one-way valve assembled in the end cover after the valve core is removed is shown in FIG.

[0100] Fig.31 for Fig.26 A structural cross-sectional view of a valve core with a drainage channel in a one-way valve shown in FIG.

[0101] Fig.32 It is a schematic structural diagram of the end cover assembly in the eighth embodiment of the present application.

[0102] Fig.33 for Fig.32 An exploded view of the end cap assembly is shown in Figure 2.

[0103] Fig.34 for Fig.32 A cross-sectional view of the structure of the end cap assembly is shown in FIG.

[0104] Fig.35 for Fig.32 A structural cross-sectional view of the one-way valve in the end cover assembly is shown in FIG.

[0105] Fig.36 for Fig.32 A cross-sectional view of the structure of the valve body and end cover in the end cover assembly shown in FIG.

[0106] Fig.37 This is a flow chart of a method for preparing a battery cell described in some embodiments of the present application.

[0107] Figure Number:

[0108] 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; 11a, first hole section; 11b, second hole section; 112, inner end surface; 113, outer end surface; 114, sealing protrusion; 12, one-way valve; 121, valve core; 1211, valve core port; 1212, flow channel port; 1213, valve core cavity; 1213a, valve core sub-cavity; 121 4. Flow channel structure; 1215. First valve core section; 1216. Second valve core section; 1217. Third valve core section; 1218. Valve core body; 1219. Valve core branch; 12a. Extrusion part; 12b. Extrusion groove; 12c. Axis; 12d. Through port; 12e. Enclosure; 12f. First end; 12g. Second end; 12h. First channel; 12i. Second channel; 12j. Spacing; 12k. Drainage channel; 12m. Position limiting convex part; 122. Valve body; 1221. Fixing part; 12211. First sealing area; 1 2212, second sealing area; 1222, sealing part; 12221, connecting section; 12222, sealing section; 1223, valve port; 1224, flow guide port; 1225, valve cavity; 1226, flow passage cavity; 1227, flow passage sub-cavity; 123, bayonet; 124, flow guide hole; 125, first surface; 126, second surface; 127, first cavity; 128, second cavity; 12n, connecting groove; 12p, sub-hole; 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, drainage channel; 1c3, buckle groove; 1c4, snap protrusion; 1c5, abutment protrusion; 1c6, abutment recess; 1c7, first guide surface; 1c8, second guide surface; 1c9, deformation gap; 1d, sealing ring; 13, sealing member; 201, first part; 202, second part; X, thickness direction; T, preset direction. DETAILED DESCRIPTION

[0109] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0110] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0111] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0112] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0113] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0114] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0115] The battery consists of battery cells, which go through exhaust and injection processes in sequence during manufacturing. During the process of switching from the exhaust process to the injection process, the injection hole on the end cover of the battery cell remains open, resulting in a series of problems such as poor water isolation and low injection efficiency in the battery cell, which greatly limits the battery's production capacity.

[0116] Specifically, since the electrolyte cannot contact water, before the battery cell is transported to the injection station for injection (electrolyte injection), the battery cell should be vented at the exhaust station first. Exhaust refers to placing the battery cell in a high temperature and vacuum environment for baking, so that the moisture of the electrode assembly contained in the internal environment of the battery cell can evaporate and be discharged to the outside of the battery cell through the injection hole on the end cover of the battery cell. During the entire exhaust process, the injection hole is always open, which improves the reliability of exhaust. After the exhaust is completed, the battery cell is transported from the exhaust station to the injection station. During this process, the injection hole is still open, resulting in poor water isolation effect of the battery cell, and water vapor in the environment can easily enter the battery cell through the injection hole, affecting the normal use of the subsequent injected electrolyte. Therefore, when the battery cell is transported to the injection station, it is necessary to evacuate the inside of the battery cell again, and then perform the injection operation. The time required for vacuuming is long, which greatly prolongs the time the battery cell stays in the injection station, and the injection efficiency is reduced.

[0117] 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.

[0118] When the valve core is not subject to external force, the sealing part and the end cover seal cooperate to block the connection between the flow channel and the internal environment of the battery cell. In this way, the medium cannot be exchanged between the external and internal environments of the battery cell, the accommodating cavity is less affected by the outside, and the water-proof effect is good. Therefore, there is no need to evacuate the internal environment of the battery cell in the subsequent injection process, and the injection efficiency is high. When the valve core is subject to external force and drives the sealing part to deform, the sealing part separates from the end cover and forms a flow port, which is connected to the flow channel. Therefore, the water vapor formed by the evaporation of water in the electrode assembly can be discharged to the outside through the flow port and the flow channel, while the electrolyte can flow into the battery cell through the flow channel and the flow port to achieve injection.

[0119] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of vehicle 10000 in some embodiments of the present application.

[0120] The embodiment of the present application provides an electric device using a battery 1000 as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0121] 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.

[0122] The vehicle 10000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 1000 is provided inside the vehicle 10000. The battery 1000 may be provided at the bottom, head or tail of the vehicle 10000. The battery 1000 may be used to power the vehicle 10000. For example, the battery 1000 may be used as an operating power source for the vehicle 10000. The vehicle 10000 may also include a controller 2000 and a motor 3000. The controller 2000 is used to control the battery 1000 to power the motor 3000, for example, to meet the power requirements for starting, navigating and driving the vehicle 10000.

[0123] In some embodiments of the present application, the battery 1000 can not only serve as the operating power source of the vehicle 10000, but also serve as the driving power source of the vehicle 10000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 10000.

[0124] Please refer to Figure 2 , Figure 2 1 is an exploded view of a battery 1000 in some embodiments of the present application.

[0125] The battery 1000 includes a box body 200 and a battery cell 100, and the battery cell 100 is accommodated in the box body 200. The box body 200 is used to provide a storage cavity for the battery cell 100, and the box body 200 can adopt a variety of structures. In some embodiments, the box body 200 may include a first part 201 and a second part 202, and the first part 201 and the second part 202 cover each other, and the first part 201 and the second part 202 jointly define a storage cavity for accommodating the battery cell 100. The second part 202 may be a hollow structure with one end open, and the first part 201 may be a plate-like structure, and the first part 201 covers the open side of the second part 202, so that the first part 201 and the second part 202 jointly define a storage cavity; the first part 201 and the second part 202 may also be hollow structures with one side open, and the open side of the first part 201 covers the open side of the second part 202. Of course, the box body 200 formed by the first part 201 and the second part 202 can be in various shapes, such as a cylinder, a cuboid, etc.

[0126] In the battery 1000, there may be multiple battery cells 100, and the multiple battery cells 100 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 100 are both connected in series and in parallel. The multiple battery cells 100 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 100 is accommodated in the box 200; of course, the battery 1000 may also be a battery module formed by connecting multiple battery cells 100 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 200. The battery 1000 may also include other structures, for example, the battery 1000 may also include a busbar component for realizing electrical connection between the multiple battery cells 100.

[0127] 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.

[0128] The battery cell 100 refers to the smallest unit constituting the battery 1000. The battery cell 100 includes an electrode assembly 30, a housing 20, and an end cap assembly 10.

[0129] 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 tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery 1000, the positive active material and the negative active material react with the electrolyte, and the tabs connect the electrode terminals to form a current loop.

[0130] The shell 20 is a component used to cooperate with the end cap 11 in the end cap assembly 10 to form the internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate the electrode assembly 30, the electrolyte and other components. The shell 20 and the end cap 11 can be independent components, and an opening can be set on the shell 20, and the internal environment of the battery cell 100 is formed by covering the opening with the end cap 11 at the opening. Without limitation, the end cap 11 and the shell 20 can also be integrated. Specifically, the end cap 11 and the shell 20 can form a common connection surface before other components are put into the shell, and when the interior of the shell 20 needs to be encapsulated, the end cap 11 covers the shell 20. The shell 20 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 20 can be determined according to the specific shape and size of the electrode assembly 30. The material of the shell 20 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiment of the present application does not impose any special restrictions on this.

[0131] The end cap assembly 10 includes an end cap 11, which refers to a component that covers the opening of the shell 20 to isolate the internal environment of the battery cell 100 from the outside. Without limitation, the shape of the end cap 11 can be adapted to the shape of the shell 20 to match the shell 20. Optionally, the end cap 11 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 11 is not easy to deform when it is squeezed and collided, so that the battery cell 100 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals can be provided on the end cap 11. The electrode terminal can be used to electrically connect to the electrode assembly 30 for outputting or inputting electrical energy of the battery cell 100. In some embodiments, the end cap 11 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold. In some embodiments, an insulating member can also be provided on the inner side of the end cap 11, and the insulating member can be used to isolate the electrical connection components in the shell 20 from the end cap 11 to reduce the risk of short circuit. For example, the insulating member may be plastic, rubber, or the like.

[0132] According to some embodiments of this application, please refer to Figure 4 and Figure 6 The present application provides a one-way valve 12 for sealing or opening the 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 injection hole 111, and it includes a sealing portion 1222. The sealing portion 1222 is used to seal with the injection hole 111, and the valve core 121 is matched with the valve body 122 and defines a flow channel for communicating with the outside with the valve body 122. Among them, 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.

[0133] The internal environment of the battery cell 100 is defined by the end cap 11 and the shell 20. The injection hole 111 of the end cap 11 is formed by the end cap 11 itself. The injection hole 111 and the internal environment of the battery cell 100 are not the same or equivalent. The end cap 11 has an outer end face 113 and an inner end face 112 that are arranged opposite to each other along the thickness direction X. The inner end face 112 and the inner wall of the shell 20 are arranged to form the internal environment of the battery cell 100. The outer end face 113 is arranged to face away from the internal environment of the battery cell 100. The injection hole 111 on the end cap 11 passes through the outer end face 113 and the inner end face 112 in sequence.

[0134] At the same time, when the injection hole 111 is sealed, the outside of the side of the end cover 11 having the outer end surface 113 is not connected to the inside 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 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 part 1222 and the end cover 11, for example: the sealing part 1222 and the end cover 11 are separated, so that there is a flow port between the two, at this time, the gas in the battery cell 100 can enter the flow channel located in the injection hole 111 through the flow port; or, the external electrolyte can enter the flow port through the flow channel located in the injection hole 111, and be injected into the battery cell 100 through the flow port.

[0135] The valve body 122 and the valve core 121 can be formed separately or integrally. Figure 4 , Figure 7 and Figure 8 For example, the valve body 122 and the valve core 121 are formed separately, wherein the valve body 122 and the valve core 121 after being formed separately can be matched in abutment, clamping, threaded connection or other matching manners; Fig. 9 and Fig.10 For example, the valve body 122 and the valve core 121 are integrally formed.

[0136] When the valve core 121 is fitted in 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 many 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, a channel can also be provided inside the valve core 121 and / or the valve body 122, so that each channel is constructed into 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. In addition, there are many ways to match the valve core 121 with the valve body 122, such as: a part of the valve core 121 is inserted into the interior of the valve body 122; or a part of the valve core 121 is clamped on the surface of the valve body 122, etc.

[0137] The sealing part 1222 is an elastic component, such as a rubber material, etc., which is separated from the end cover 11 by deformation such as contraction and elongation under the action of external force to form a flow port. When the external force is removed, the sealing part 1222 automatically recovers its deformation and re-seals with the end cover 11. It should be noted that when the external force is removed, there is a certain pre-pressure between the sealing part 1222 and the end cover 11, so that the rebound force of the sealing part 1222 can provide a sealing force, thereby improving the sealing effect of the injection hole 111.

[0138] Exemplarily, the sealing portion 1222 can achieve a sealed fit between the sealing portion 1222 and the end cover 11 by abutting against the hole wall of the injection hole 111. In this embodiment, a flow outlet is formed when the sealing portion 1222 is separated from the hole wall of the injection hole 111; and / or, the sealing portion 1222 can also achieve a sealed fit between the sealing portion 1222 and the end cover 11 by being received in the internal environment of the battery cell 100 and abutting against the inner end surface 112 of the end cover 11. In this embodiment, a flow outlet is formed when the sealing portion 1222 is separated from the inner end surface 112 of the end cover 11.

[0139] In actual production, the one-way valve 12, the end cover 11, the shell 20 and the electrode assembly 30 are pre-packaged to form a battery cell 100. During exhaust, the battery cell 100 is located at the exhaust station and placed in a high temperature and vacuum environment, and the valve core 121 is pressed by a porous plate. The opening of the flow channel away from the flow port is connected to the outside through the pore structure on the porous plate. Under the gravity of the porous plate, the valve core 121 sinks and drives the sealing part 1222 to deform and separate from the end cover 11 to form a flow port. In this way, the moisture in the electrode assembly 30 is evaporated by heat and flows through the flow port, the flow channel and the pore structure of the porous plate in turn to be discharged to the outside. After the exhaust is completed, the porous plate is raised and the effect of the porous plate on the valve core 121 is cancelled. Since the sealing part 1222 has been deformed when it is separated from the end cover 11, when the effect of the porous plate on the valve core 121 is cancelled, the sealing part 1222 will rebound and seal with the end cover 11 again. At this time, the flow port is closed again, and the external environment is isolated from the internal environment of the battery cell 100, which greatly reduces the medium exchange between the external environment and the internal environment of the battery cell 100, so that a high vacuum degree can still be maintained in the battery cell 100.

[0140] It can be understood that the medium refers to a substance existing in the external environment and / or the internal environment of the battery cell 100. The substance existing in the external environment may be water vapor, air, etc. The substance existing in the internal environment of the battery cell 100 may be an electrolyte.

[0141] After that, the battery cell 100 is transported to the liquid injection station for liquid injection. During the process of transporting the battery cell 100 from the exhaust station to the liquid injection station, since the flow passage in the one-way valve 12 is always separated from the internal environment of the battery cell 100, the battery cell 100 still has a high vacuum degree. Therefore, when the battery 1000 is transported to the liquid injection station, it is no longer necessary to evacuate the battery cell 100.

[0142] When injecting liquid, the injection rubber sleeve of the injection nozzle presses down the valve core 121, and the valve core 121 sinks again, and drives the sealing part 1222 to separate from the end cover 11 and form a flow port. In this way, the electrolyte flowing out of the injection nozzle flows into the battery cell 100 through the flow channel and the flow port in sequence. After the injection is completed, the injection nozzle is removed. At this time, when the pressure of the injection nozzle on the valve core 121 disappears, the sealing part 1222 and the end cover 11 are re-sealed to isolate the internal environment of the battery cell 100 from the outside of the battery cell 100, so that the electrolyte can be sealed in the battery cell 100 and undergo chemical reactions.

[0143] 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 .

[0144] In addition, the valve body 122 is assembled in the injection hole 111, and there are many ways to assemble it, such as: a fixing structure is set on the side of the end cover 11 facing the inside of the battery cell 100, and the fixing structure presses the sealing part 1222 onto the end cover 11; or a fixing structure is set on the part of the valve body 122 located in the 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 injection hole 111, etc.

[0145] With such a design, when the valve core 121 is not subjected to external force, the sealing portion 1222 seals with the end cover 11 and blocks the flow channel from the internal environment of the battery cell 100. In this way, the medium cannot be exchanged between the outside and the internal environment of the battery cell 100, that is, exhaust or injection is impossible. The internal environment of the battery cell 100 is minimally affected by the outside, and the water-proof effect is good. Therefore, in the subsequent injection process, there is no need to evacuate the battery cell 100, and the injection efficiency is high. When the valve core 121 is subjected to external force, the sealing portion 1222 separates from the end cover 11 and forms a flow port, which is connected to the flow channel. Therefore, the water vapor formed by the evaporation of water in the electrode assembly 30 can be discharged to the outside through the flow port and the flow channel to achieve exhaust. In addition, the electrolyte can also flow into the internal environment of the battery cell 100 through the flow channel and the flow port and achieve injection. Therefore, by providing a one-way valve 12 at the injection hole 111 of the end cover 11 , the external impact on the internal environment of the battery cell 100 during the production process of the battery 1000 can be effectively reduced, thereby improving the water isolation effect and injection efficiency of the battery cell 100 .

[0146] According to some embodiments of the present application, optionally, the one-way valve 12 also includes an abutment member 1a, which is used to be arranged on the end cover 11, and the abutment member 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 injection hole 111.

[0147] 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 choices for the material of the abutment 1a, as long as they have a certain structural strength, such as: metals such as aluminum, copper, iron, or plastics and rubber.

[0148] The abutment 1a can be arranged on one side of the sealing portion 1222, and the edge of the sealing portion 1222 can be abutted against the end cover 11. For example, the abutment 1a can be designed as an L-shaped structure. Of course, the abutment 1a can also cover the sealing portion 1222, so that the sealing portion 1222 is pressed against the end cover 11. When the abutment 1a covers the abutment 1a, a through-hole structure can be provided on the abutment 1a, so that the medium can enter the interior of the battery cell 100 or the flow port through the abutment 1a.

[0149] In addition, when the injection hole 111 is opened, the portion of the sealing part 1222 abutted by the abutting member 1a will not separate from the end cover 11, but will always abut against the end cover 11, so that after the external force disappears, the sealing part 1222 will be re-sealed in the injection hole 111. The portion not abutted by the abutting member 1a will separate from the end cover 11 under the action of external force, such as the push of the valve core 121, forming a flow port, so that the flow channel is connected to the interior of the battery cell 100 through the flow port.

[0150] With such a design, the abutment part 1a is introduced, so that the sealing part 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.

[0151] According to some embodiments of the present application, optionally, please refer to Figure 5 The abutment member 1 a covers the sealing portion 1222 , and a portion of the inner wall of the abutment member 1 a abuts against the sealing portion 1222 .

[0152] The abutment member 1a covers the sealing portion 1222, which means that the abutment member 1a has a cover-like structure, and the sealing portion 1222 is located inside the abutment member 1a, so that the abutment member 1a can better abut the sealing portion 1222 in the circumferential direction. When the sealing portion 1222 is subjected to an external force, the sealing portion 1222 can be deformed toward one side of the abutment member 1a, and at least part of it is separated from the end cover 11 to form a flow port.

[0153] To facilitate the deformation of the sealing portion 1222 inside the abutment 1a, a certain gap may be left between the abutment 1a and the sealing portion 1222; alternatively, a hole may be opened on the abutment 1a so that when the sealing portion 1222 is deformed, at least part of it can pass through the hole and out of the abutment 1a.

[0154] 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.

[0155] According to some embodiments of the present application, optionally, please refer to Figure 5A deformation recess 1c is formed inwardly on a side of the sealing portion 1222 facing away from the valve core 121, and a portion of the sealing portion 1222 located at the periphery of the deformation recess 1c abuts against an inner wall of the abutting member 1a.

[0156] 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 a contact protrusion 1c1. The contact protrusion 1c1 can be arranged at intervals on the outer periphery of the deformation recess 1c, or it can be in an annular structure, extending around the outer periphery of the deformation recess 1c. When the sealing portion 1222 is subjected to an external force, the contact protrusion 1c1 will also bend and deform on the contact member 1a, so that the portion located in the deformation recess 1c can move toward the contact member 1a, so that the sealing portion 1222 can at least partially separate from the end cover 11 to form a flow port.

[0157] 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 can form a flow opening with the end cover 11 after deforming toward the abutment member 1a.

[0158] Such a design introduces the deformation recess 1c, which facilitates the deformation of the sealing portion 1222 toward the side of the abutment member 1a, thereby facilitating the opening of the injection hole 111 for exhaust or injection operations.

[0159] According to some embodiments of the present application, optionally, please refer to Figure 6 A first through hole 1a4 is formed through the abutment member 1a, and the first through hole 1a4 is configured to allow the sealing portion 1222 to deform at least partially along a side away from the valve core 121.

[0160] When the injection hole 111 is opened, the sealing portion 1222 needs to deform toward the side of the abutment 1a, so 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 is reserved between the sealing portion 1222 and the abutment 1a, but if a sufficient gap is reserved, the size of the one-way valve 12 in the thickness direction X of the end cover 11 will be excessively increased, occupying too much space inside the battery cell 100, affecting the energy density of the battery 1000.

[0161] To this end, a first through hole 1a4 is provided through the abutment 1a, and when deformed, the portion of the sealing portion 1222 located at the injection hole 111 can extend into or extend out of the first through hole 1a4. The shape of the first through hole 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 through hole 1a4 is arranged 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 through hole 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 through hole 1a4. In addition, the first through hole 1a4 is provided on the abutment 1a, which can also facilitate the medium to pass through the abutment 1a.

[0162] Of course, in this embodiment, there may be a certain gap between the sealing portion 1222 and the abutment member 1a. For example, in some examples, a deformation recess 1c is recessed in the side of the sealing portion 1222 facing away from the valve core 121, and the deformation recess 1c is arranged opposite to the first through hole 1a4. There may be a variety of designs for the relationship between the size of the deformation recess 1c and the first through hole 1a4, for example: the projection of the deformation recess 1c on the abutment member 1a may cover the first through hole 1a4; or it may just overlap with the first through hole 1a4. Of course, the formed projection may also be smaller than the size of the first through hole 1a4.

[0163] Such a design introduces the first perforation 1a4, which reduces or eliminates the gap reserved for deformation between the sealing portion 1222 and the abutment 1a while allowing the sealing portion 1222 to deform, thereby reducing interference between structures; at the same time, it reduces the demand for space below the end cover 11 by accessories related to the one-way valve 12, reduces the space occupied by the battery cell 100, and is beneficial to improving the energy density of the battery 1000; it also improves the compatibility of the one-way valve 12 structure with different battery cells 100.

[0164] According to some embodiments of the present application, optionally, 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.

[0165] The cover body 1a1 refers to a structure that can cover the sealing part 1222 and abut against the sealing part 1222, and can be designed in a circular, square, pentagonal, etc. The edge portion 1a2 refers to a structure connected to the outer edge of the cover body 1a1, which is arranged on the end cover 11 so that the abutment member 1a can be stably installed on the end cover 11 and seal the sealing part 1222 in the injection hole 111. There are many ways to install the edge portion 1a2 on the end cover 11, such as: it can be but not limited to bolt connection, clamping, bonding, crimping, etc.

[0166] The edge portion 1a2 may be distributed at intervals on the outer edge of the cover portion 1a1, or may extend in a ring shape along the outer edge of the cover portion 1a1. At the same time, the connection between the edge portion 1a2 and the cover portion 1a1 may be, but not limited to, bolt connection, clamping, riveting, welding, bonding, etc., or may be an integrated molding method, such as injection molding, die casting, 3D printing, etc.

[0167] In addition, when the abutting member 1a is provided with a first through hole 1a4, the first through hole 1a4 may be provided on the cover portion 1a1.

[0168] In this way, the abutting member 1 a is designed to be a cover portion 1 a 1 and an edge portion 1 a 2 , so that the abutting member 1 a can be conveniently covered on the sealing portion 1222 and installed on the end cover 11 .

[0169] According to some embodiments of the present application, optionally, please refer to Figure 5 A first through hole 1a5 is formed through the abutting member 1a, and a medium outflow direction in the first through hole 1a5 intersects with an axis 12c of the valve core 121.

[0170] 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, when exhausting, there is a flow port 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 from the first through hole 1a5; then enter the flow channel located in the injection hole 111 through the flow port, and finally be discharged from the battery cell 100.

[0171] The number of the first through hole 1a5 can be one or more. When the number of the first through hole 1a5 is more than one, please refer to Figure 6 All the first through holes 1a5 are arranged at intervals along the circumference of the abutment member 1a. Meanwhile, when the abutment member 1a may include a cover portion 1a1 and an edge portion 1a2 arranged on the outer edge of the cover portion 1a1, the first through holes 1a5 may be arranged on the edge portion 1a2 or on the cover portion 1a1.

[0172] 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 1a from the first through hole 1a5, which 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 the air and gas in the formation exhaust gas. The first through hole 1a5 can be distributed in various positions on the abutment 1a, for example: the first through hole 1a5 can be set on the bottom surface of the abutment 1a, or on the side surface of the abutment 1a. In some examples, the abutment 1a includes a cover body 1a1 and an edge 1a2 disposed on the outer edge of the cover body 1a1, the cover body 1a1 includes a bottom edge 1aa and a surrounding edge 1ab, the bottom edge 1aa and the edge 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 1a2, the bottom edge 1aa and the sealing portion 1222 are arranged relative to each other in the thickness direction X of the end cover 11, and the first through hole 1a5 is arranged on 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 one end close to the bottom edge 1aa to the end close to the edge 1a2. In this way, the first through hole 1a5 can be arranged on the side of the abutment 1a, dispersing the impact force of the electrolyte, and reducing the electrolyte from directly rushing to the electrode assembly 30 during injection, which may cause abnormality in the process of the battery 1000.

[0173] Such a design introduces the first through hole 1a5, so that during the exhaust or liquid injection process, it is convenient for the medium to pass through the abutment member 1a more easily, so that the exhaust or liquid injection operation can be carried out more smoothly.

[0174] According to some embodiments of the present application, optionally, please refer to Figure 5 and Figure 6 The one-way valve 12 further includes an insulating cover 1b, and the insulating cover 1b is covered on the abutting member 1a.

[0175] 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.

[0176] If the abutting member 1a only abuts against the outer edge of the sealing portion 1222, the insulating cover 1b covers the abutting member 1a; if the abutting member 1a covers the sealing portion 1222, the insulating cover 1b can cover the abutting member 1a and the outside of the sealing portion 1222 at the same time. Figure 6 , Figures 11 to 13 When the abutment member 1a covers the sealing portion 1222, a first through hole 1a5 and a first perforation 1a4 are provided thereon, and a second through hole 1b2 and a second perforation 1b1 can also be provided on the insulating cover 1b, the second perforation 1b1 is arranged opposite to the first perforation 1a4, and the second through hole 1b2 is opposite to the first through hole 1a5. In addition, when the second through hole 1b2 is arranged in position, it can be arranged on the side of the insulating cover 1b, so that the electrolyte can be reduced from directly impacting the electrode assembly 30 during injection.

[0177] With such a design, the insulating cover 1 b is introduced to insulate the abutment 1 a so that it will not be in electrical contact with the components in the battery cell 100 , which is beneficial to improving the reliability of the battery 1000 .

[0178] According to some embodiments of the present application, optionally, please refer to Figure 5 The sealing portion 1222 includes a connecting section 12221 for passing through the 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 injection hole 111, and the valve core 121 is at least partially cooperated with the connecting section 12221.

[0179] The sealing portion 1222 includes a connecting section 12221 and a sealing section 12222. The connecting section 12221 is located in the injection hole 111 and between the valve core 121 and the sealing section 12222. The sealing section 12222 may be entirely located outside the injection hole 111 or at least partially located inside the injection hole 111. There are many ways to achieve the sealing of the injection hole 111, for example: the surface of the connecting section 12221 is tightly fitted with the hole wall of the 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 crimped onto the inner end face 112 by the abutment 1a, since the crimped portion of the sealing section 12222 cannot be separated from the inner end face 112 of the end cover 11, during structural design, the uncrimped portion of the sealing section 12222 can be separated from the inner end face 112 under the action of an external force to form a flow port, for example: the edge of the sealing section 12222 has a structure extending radially outward, and the abutment 1a crimps the radially outward extending structure onto the inner end face 112, so that a portion of the sealing section 12222 can be separated from the inner end face 112 under the action of an external force. Alternatively, the portion of the sealing section 12222 located in the injection hole 111 is sealed and fitted with the injection hole 111; of course, it can also be a combination of any two or more of the above.

[0180] In some embodiments, please refer to Figure 5 and Figure 8The sealing section 12222 is located outside the injection hole 111 and is received in the internal environment of the battery cell 100, and the sealing section 12222 presses against the inner end surface 112 of the end cover 11 to achieve a sealed fit. In this embodiment, under the action of an external force, the valve core 121 drives the connecting section 12221 to stretch, so that the sealing section 12222 can move relative to the end cover 11 along the thickness direction X of the end cover 11, and separate from the inner end surface 112 of the end cover 11 to form a flow port. In some embodiments, please refer to Fig.10 The sealing section 12222 is at least partially located in the injection hole 111 and abuts against the hole wall or the hole edge of one end of the injection hole 111 to achieve a sealing fit. In this embodiment, when an external force acts, the valve core 121 drives the connecting section 12221 to stretch, so that the sealing section 12222 can move relative to the end cover 11 along the thickness direction X of the end cover 11, and separate from the hole wall of the injection hole 111 to form a flow port.

[0181] The connection section 12221 and the valve core 121 are designed to be detachable. When the battery cell 100 is exhausted or filled with liquid, the valve core 121 can be removed from the connection section 12221, so that only the valve body 122 is left in the battery cell 100, which can reduce the structure on the battery cell 100. Of course, the connection section 12221 and the valve core 121 can also be designed as an integrated structure.

[0182] With such a design, 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 and / or the connecting section 12221 sinks and separates from the end cover 11 to form a flow port; after exhausting or injecting liquid, the connecting section 12221 restores its deformation, and the sealing portion 1222 is sealed with the end cover 11 again.

[0183] According to some embodiments of the present application, optionally, please refer to Fig.10 and Fig.13 The connecting section 12221 and the valve core 121 are an integrated structure.

[0184] 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 integrally arranged.

[0185] 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.

[0186] Specifically, at least the sealing portion 1222 is an elastic component, and under the action of external force, the valve core 121 drives the sealing portion 1222 to stretch along the thickness direction X of the end cover 11, so that more of the sealing portion 1222 extends into the internal environment of the battery cell 100. Furthermore, the sealing portion 1222 is separated from the inner end surface 112 of the end cover 11 and / or the hole wall of the injection hole 111 to form a flow port.

[0187] 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 external force until it is separated from the end cover 11 to form a flow port. The method of stretching and forming a flow port is simple to operate, and it is convenient to simplify the structure of the one-way valve 12, which greatly reduces the manufacturing cost of the one-way valve 12. When the external force is removed, the sealing portion 1222 restores its deformation, and the sealing portion 1222 is sealed with the end cover 11 again. In this process, the residual electrolyte in the valve core 121 flows into the internal environment of the battery cell 100 through the flow channel, which helps to reduce the crystallization or moisture absorption of the electrolyte in the valve core 121 that affects the performance of the battery cell 100.

[0188] Such a design is helpful to simplify the structure of the one-way valve 12, thereby greatly reducing the manufacturing cost.

[0189] According to some embodiments of the present application, optionally, please refer to Figure 6 and Fig.12 The connecting section 12221 is detachably connected to the valve core 121 .

[0190] 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, clamping, threaded connection, etc.

[0191] With such a design, after the exhaust or injection is completed, the valve core 121 can be removed from the connecting section 12221 , thereby 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 .

[0192] According to some embodiments of the present application, optionally, please refer to Figure 5 and Figure 8 Among the connecting section 12221 and the valve core 121, one of them is provided with a buckle groove 1c3, and the other is provided with a buckle protrusion 1c4 that matches with the buckle groove 1c3.

[0193] The buckle groove 1c3 refers to a concave structure on the connecting section 12221 or the valve core 121, which can connect the connecting section 12221 with the valve core 121 when it cooperates with the buckle protrusion 1c4. The buckle groove 1c3 can be provided on the connecting section 12221, and the buckle protrusion 1c4 can be provided on the valve core 121; or, the buckle groove 1c3 can be provided on the valve core 121, and the buckle protrusion 1c4 can be provided on the connecting section 12221.

[0194] 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 also convenient to remove the valve core 121 and reduce the structure on the end cover 11.

[0195] According to some embodiments of the present application, optionally, please refer to Figure 5 The circumferential portion of the sealing segment 12222 radially protrudes outside 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 and fit with the hole wall of the injection hole 111 .

[0196] 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 injection hole 111, the circumferential portion is located outside the injection hole 111 and abuts against the inner end surface 112 of the end cover 11. In some examples, the one-way valve 12 further includes an abutment member 1a, which covers the sealing segment 12222, and whose inner wall abuts against the circumferential portion of the sealing segment 12222, so that the sealing segment 12222 is tightly pressed against the end cover 11.

[0197] During the exhaust or injection process, under the action of external force, the valve core 121 pushes the connecting section 12221 and the sealing section 12222, causing the two to deform, thereby separating the connecting section 12221 from the hole wall of the injection hole 111, so that a flow opening is formed between the connecting section 12221 and the end cover 11. Of course, in addition to abutting against the inner end surface 112 of the end cover 11, the sealing section 12222 can also be sealed with the injection hole 111, for example: a portion of the sealing section 12222 close to the connecting section 12221 is sealed and fitted with the edge of one end of the injection hole 111.

[0198] Such a design facilitates the connection section 12221 to fit closely on the hole wall of the injection hole 111, thereby improving the sealing effect.

[0199] According to some embodiments of the present application, optionally, please refer to Figure 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 communicated with the drainage channel 1c2.

[0200] 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 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.

[0201] With such a design, the drainage channel 1c2 is introduced on the sealing section 12222, so that the medium can flow stably on the sealing section 12222, thereby improving the stability of the exhaust or liquid injection operation.

[0202] According to some embodiments of the present application, optionally, please refer to Figure 5 and Fig. 27 A first guide surface 1c7 is circumferentially provided at one end of the connecting section 12221 away from the sealing section 12222 , and an area A1 of a cross section of the first guide surface 1c7 gradually decreases in a direction away from the sealing section 12222 .

[0203] The first guide surface 1c7 is located in the circumference of the end of the connecting section 12221 away from the sealing section 12222, and is presented as an annular surface. The cross section of the first guide surface 1c7 can be understood as: the first guide surface 1c7 is intercepted by a plane perpendicular to the axis 12c of the valve core 121, and the obtained cross section is the cross section of the first guide surface 1c7. The area A1 of the cross section of the first guide surface 1c7 is smaller as it is farther away from the sealing section 12222, which indicates that the first guide surface 1c7 is constructed as or similar to a conical surface. In some examples, the end of the connecting section 12221 away from the sealing section 12222 is chamfered to form the first guide surface 1c7.

[0204] In this design, a first guide surface 1c7 is provided at one end of the connecting section 12221 away from the sealing section 12222, so that when the sealing section 1222 reseals the injection hole 111, it can automatically reset to the initial position under the guidance of the first guide surface 1c7, thereby reducing the risk of valve closing failure caused by the abutment between the connecting section 12221 and the wall of the injection hole 111.

[0205] According to some embodiments of the present application, optionally, please refer to Figure 5 The valve core 121 is provided with a flow chamber 1226 , which extends along the axis 12c of the valve core 121 and can lead to the sealing portion 1222 , and a flow channel is defined between the flow chamber 1226 and the sealing portion 1222 .

[0206] The flow chamber 1226 refers to a structure on the valve core 121 that allows the medium to pass through, and is also a part of the flow passage. The flow chamber 1226 extends along the axis 12c of the valve core 121 to the sealing portion 1222, which means that the flow passage can be composed of the flow chamber 1226 and a part of the surface of the sealing portion 1222. In this way, during the injection process, the electrolyte can flow from the flow chamber 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 an 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.

[0207] The flow chamber 1226 can be distributed in various positions on the valve core 121, for example, the flow chamber 1226 can be arranged inside the valve core 121 or on the surface of the valve core 121. Of course, a part of the flow chamber 1226 is arranged inside the valve core 121, and another part of the flow chamber 1226 is arranged on the surface of the valve core 121.

[0208] When the flow chamber 1226 is disposed inside the valve core 121, please refer to Figure 5 and Figure 8 , it is also necessary to open a communication port 12d on the valve core 121 to communicate with the flow chamber 1226, and the communication port 12d leads to the surface of the sealing portion 1222. The communication port 12d can be set on the side of the hole wall of the valve core 121 facing the injection hole 111, or can be set on the bottom surface of the valve core 121 facing the sealing portion 1222. At the same time, the leading in this embodiment should be understood as: during the injection process, the medium, such as electrolyte, will flow out of the flow chamber 1226 and will flow to the sealing portion 1222 and flow on the sealing portion 1222. Of course, during the baking exhaust process, the medium, such as air, will flow from the sealing portion 1222 to and enter the flow chamber 1226.

[0209] Such a design introduces the flow cavity 1226, which makes it easier for the electrolyte to flow to the sealing portion 1222 during the injection process, making the injection operation more convenient.

[0210] According to some embodiments of the present application, optionally, 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.

[0211] When the flow chamber 1226 is arranged on the side of the valve core 121 around its own axis 12c, please refer to Fig.10 and Fig.13, the medium will flow through the side of the valve core 121 to the sealing part 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 matched on the sealing part 1222, the flow chamber 1226 can be surrounded by the hole wall of the injection hole 111 or a part of the sealing part 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 set inside the valve core 121, it is necessary to open a communication port 12d on the valve core 121 to communicate with the flow chamber 1226, and the communication port 12d leads to the surface of the sealing part 1222.

[0212] The shape of the flow chamber 1226 can be designed in many ways, for example, the flow cross-section of the flow chamber 1226 can be a regular shape such as an ellipse, a circle, a square, a pentagon, etc.; or an irregular shape. The number of the flow chamber 1226 can be one or more. When there are more than one flow chamber 1226, all the flow chambers 1226 are arranged in parallel and at intervals.

[0213] 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.

[0214] According to some embodiments of the present application, optionally, 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 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.

[0215] The valve core body 1218 refers to the structure on the valve core 121 close to the valve body 122 when the valve core 121 is matched with the valve body 122. The valve core body 1218 can be directly and detachably inserted into the valve body 122, or can be clamped with the valve body 122. The extrusion portion 12a refers to the structure of the valve core 121 away from the valve body 122 when the valve core 121 is matched with and on the valve body 122. During the exhaust or injection process, the extrusion portion 12a directly bears the external force, and by pressing down the valve core body 1218, the sealing portion 1222 and the end cover 11 are driven to separate to form a flow port.

[0216] The extrusion portion 12a protrudes out of the valve core body 1218 in the radial direction of the valve core 121, so that when pressed down, the portion of the extrusion portion 12a protruding out of the valve core body 1218 can play a limiting role, which can reduce the risk of excessive downward pressure on the valve core 121. In some examples, the circumferential edges of the extrusion portion 12a all protrude out of the valve core body 1218 in the radial direction.

[0217] The flow chamber 1226 can be provided through the portion of the extrusion portion 12a protruding outside the valve core body 1218, or can 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 can extend to the surface of the valve core body 1218, so that one end of the flow chamber 1226 can be connected to the surface of the sealing portion 1222.

[0218] Such a design introduces the extrusion portion 12a and the valve core body 1218, which makes it convenient for the valve core 121 to push the sealing portion 1222 to open the injection hole 111, thereby improving the convenience of operation.

[0219] According to some embodiments of the present application, optionally, please refer to Figure 5 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 the end of the extrusion groove 12b close to the valve core body 1218.

[0220] 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. Figure 5 For example, the cross section of the extrusion groove 12b is Figure 5 The cross section indicated by S in FIG. The closer the extrusion groove 12b is to the valve core body 1218, the smaller its cross-sectional area is, and a conical design can be presented. 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.

[0221] With such design, the extrusion groove 12b is reasonably designed, so that the electrolyte can be more easily collected in the flow chamber 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 to reduce the overflow of the electrolyte.

[0222] According to some embodiments of the present application, optionally, please refer to Figure 5 , Figure 7 and Fig.29 A stopper 12e is convexly provided on the side of the extrusion portion 12a facing away from the valve body 122, and the stopper 12e is arranged in a ring shape around the outer periphery of the flow cavity 1226.

[0223] The enclosure 12e refers to a structure arranged around the extrusion part 12a, which provides a barrier around the extrusion part 12a. For example, during the injection process, the injection nozzle abuts against the extrusion part 12a, and the electrolyte enters the flow cavity 1226 on the extrusion part 12a from the injection nozzle. Since the enclosure 12e is arranged in an annular shape around the extrusion part 12a, it can block the electrolyte and reduce the probability of the electrolyte overflowing around the extrusion part 12a.

[0224] The enclosure 12e can be an integral structure with the extrusion portion 12a, and protrude from the surface of the extrusion portion 12a along the direction of the axis 12c of the valve core 121; of course, the enclosure 12e can also be combined with the extrusion portion 12a in other ways, such as: fixed to the extrusion portion 12a by bonding, clamping, etc.

[0225] With such a design, the baffle 12e is introduced to reduce the probability of electrolyte overflowing around the extrusion portion 12a, so that the injection operation can be carried out stably.

[0226] According to some embodiments of the present application, optionally, please refer to Figure 8 and Fig.28 A limiting protrusion 12m is convexly provided on one side of the extrusion portion 12a facing the valve body 122. The limiting protrusion 12m surrounds the outer periphery of the valve core body 1218 and is used for interfering with the end cover 11.

[0227] When the valve is opened for liquid injection or exhaust, the valve core 121 squeezes the valve body 122 under the action of external force, causing the sealing portion 1222 to deform and separate from the end cover 11 to form a flow port. When the valve core 121 is squeezed toward the valve body 122, the limiting protrusion 12m will collide with the portion of the end cover 11 located on the periphery of the injection hole 111, limiting the valve core 121 from moving further toward the valve body 122. Before the valve is opened, there is a certain distance between the limiting protrusion 12m and the end cover 11, and the specific value of the distance can be determined according to the actual stroke of the valve opening.

[0228] Such a design introduces a limiting protrusion 12m to limit the travel of the valve core 121 when the valve core 121 pushes the valve body 122, thereby reducing the risk of the valve body 122 being unable to properly seal the injection hole 111 due to excessive pushing, and improving the structural stability of the one-way valve 12.

[0229] According to some embodiments of the present application, optionally, please refer to Figures 14 to 18 , and refer to Fig.19 and Fig. 20 A valve cavity 1225 is defined in 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 connected in sequence to form a flow passage.

[0230] The valve cavity 1225 refers to the space structure inside the valve body 122. When the injection hole 111 is opened, the valve core 121 is at least partially located in the valve cavity 1225. The valve port 1223 and the guide port 1224 are respectively connected to the valve cavity 1225, so that the valve core 121 can act in the valve cavity 1225 through the valve port 1223; at the same time, the guide port 1224 facilitates the medium to enter the valve cavity 1225 or be discharged from the valve cavity 1225.

[0231] Specifically, the valve core 121 may be partially located in the valve cavity 1225, and the remaining portion may extend out of the valve port 1223, or the valve core 121 may be completely located in the valve cavity 1225. To improve the reliability of the valve core 121 drive, the remaining portion of the valve core 121 is extended out of the valve port 1223, so that during the exhaust process, the porous plate may drive the valve core 121 to sink relative to the valve body 122, and during the injection process, the injection nozzle may also drive the valve core 121 to sink relative to the valve body 122.

[0232] In some examples, the valve core 121 may only include a valve core body 1218, the valve core body 1218 is disposed in the valve cavity 1225, and a flow cavity 1226 is formed between the outer wall of the valve core body 1218 and the cavity wall of the valve cavity 1225. In some embodiments, the valve core 121 may include a plurality of valve core branches 1219 in addition to the valve core body 1218, all of which are arranged at intervals along the circumference of the valve core body 1218, and separate the flow cavity 1226 into a plurality of flow sub-cavities 1227. Specifically, the valve core body 1218 and each of the two adjacent valve core branches 1219 together form a flow sub-cavity 1227.

[0233] The sealing portion 1222 includes a connecting section 12221 and a sealing section 12222. In some embodiments, the connecting section 12221 may be a continuous annular structure, on which one or more guide ports 1224 are provided at intervals along the circumference of the valve body 122. Fig.18 There are multiple connecting sections 12221 and they are spaced apart along the circumference of the valve body 122, and a guide port 1224 is defined between each two adjacent connecting sections 12221. Each connecting section 12221 can extend along the thickness direction X of the end cover 11 or along the radial direction of the injection hole 111.

[0234] The number of the guide ports 1224 may be one or more, and may be specifically set according to needs.

[0235] Taking the case where the flow chamber 1226 is not divided into the flow sub-chamber 1227 and there is only one flow guide port 1224 as an example, the valve port 1223, the flow chamber 1226 and the flow guide port 1224 are sequentially connected to form a flow passage. In this embodiment, the one-way valve 12 has only one flow passage.

[0236] Taking the case where the flow chamber 1226 is not divided to form a flow sub-chamber 1227, and there are multiple flow guide ports 1224 that are arranged at circumferential intervals along the valve body 122 as an example, the valve port 1223, the flow chamber 1226 and each flow guide port 1224 are connected in sequence to form a flow channel. In this embodiment, there are multiple flow channels in the one-way valve 12, and all the flow channels share the valve port 1223 and the flow chamber 1226.

[0237] Taking the case where the flow chamber 1226 is divided into flow sub-chambers 1227, and the flow guide port 1224 is one and extends along the circumference of the valve body 122 as an example, the valve port 1223, each flow sub-chamber 1227 and the flow guide port 1224 are connected in sequence to form a flow passage. In this embodiment, the one-way valve 12 has multiple flow passages, and all the flow passages share the valve port 1223 and the flow guide port 1224.

[0238] Taking the example that the flow chamber 1226 is divided to form a flow sub-chamber 1227, and the flow sub-chamber 1227 corresponds to the flow guide port 1224 one by one, the valve port 1223, the flow sub-chamber 1227 and the flow guide port 1224 corresponding to the flow sub-chamber 1227 are connected in sequence to form a flow channel. In this embodiment, the one-way valve 12 has multiple flow channels, and all the flow channels only share the valve port 1223.

[0239] With this design, the valve port 1223, the flow chamber 1226 and the flow guide port 1224 are always connected to form a flow passage. When the valve core 121 is driven by an external force to deform the sealing portion 1222 and separate from the end cover 11 to form a flow port, the flow passage is directly connected to the flow port to facilitate subsequent exhaust and liquid injection.

[0240] According to some embodiments of the present application, optionally, please refer to Figure 26 to Figure 29 The flow chamber 1226 is arranged inside the valve core 121, and one end of the flow chamber 1226 close to the sealing portion 1222 is constructed as a buckle groove 1c3; the sealing portion 1222 is provided with a buckle protrusion 1c4 for being buckled in the buckle groove 1c3.

[0241] It is easy to understand that, since the flow chamber 1226 is disposed inside the valve core 121 and extends in the direction of the axis 12c of the valve core 121, in order to facilitate the medium to enter the flow chamber 1226 and to be discharged out of the flow chamber 1226, the flow chamber 1226 may have opening structures connected with the valve core 121 at both ends along the direction of its own axis 12c. At the same time, one end of the flow chamber 1226 has a buckle groove 1c3, so that during assembly, the buckle groove 1c3 can be matched with the buckle protrusion 1c4 on the sealing part 1222, so that the valve core 121 can be quickly buckled on the sealing part 1222. When the injection or exhaust is completed, the buckle groove 1c3 can be separated from the buckle protrusion 1c4, so that the valve core 121 and the sealing part 1222 can be quickly disassembled. After disassembly, the buckle protrusion 1c4 can also be cut off from the sealing portion 1222. After cutting off, a sealing member 13, such as a sealing nail, is covered at one end of the injection hole 111. For details, refer to Fig.29 In addition, when the buckle groove 1c3 cooperates with the buckle protrusion 1c4, the electrolyte in the flow chamber 1226 can flow to the sealing portion 1222 through the gap between the buckle groove 1c3 and the buckle protrusion 1c4; of course, additional holes can also be opened on the side of the valve core 121 to allow the electrolyte in the flow chamber 1226 to flow to the sealing portion 1222.

[0242] Among them, there are many ways to implement the cooperation between the snap protrusion 1c4 and the snap groove 1c3, such as: setting a convex part on the groove wall of the snap groove 1c3, and setting a matching concave part on the side of the snap protrusion 1c4; or, setting a concave part on the groove wall of the snap groove 1c3, and setting a matching convex part on the side of the snap protrusion 1c4, etc.

[0243] Such a design introduces the buckle groove 1c3 and the buckle protrusion 1c4, so that the valve core 121 and the sealing part 1222 can be quickly disassembled and assembled, which is beneficial to improving the convenience of the one-way valve 12.

[0244] According to some embodiments of the present application, optionally, please refer to Fig.28 , Fig.29 and Fig.31 A resisting protrusion 1c5 is convexly provided on the inner wall of the buckle groove 1c3, and a resisting concave portion 1c6 is provided on one side of the buckle protrusion 1c4, and the resisting protrusion 1c5 is in contact with the inner wall of the resisting concave portion 1c6.

[0245] When the snap protrusion 1c4 is inserted into the snap groove 1c3, the interfering convex portion 1c5 in the snap groove 1c3 is correspondingly interfering with the interfering concave portion 1c6, so that the snap protrusion 1c4 is interfering with the snap groove 1c3. The number of the interfering convex portion 1c5 and the interfering concave portion 1c6 can be one or more. At the same time, the quantitative relationship between the interfering convex portion 1c5 and the interfering concave portion 1c6 can be one-to-one or many-to-one, that is, multiple interfering convex portions 1c5 can be simultaneously interfering with one interfering concave portion 1c6.

[0246] With such a design, the engaging protrusion 1c5 cooperates with the engaging recess 1c6, so that the snap protrusion 1c4 and the snap groove 1c3 can be snapped together quickly, thereby improving the assembly efficiency of the one-way valve 12.

[0247] According to some embodiments of the present application, optionally, please refer to Fig.28 The abutting convex parts 1c5 include more than two abutting convex parts 1c5, all of which are spaced apart around the axis 12c of the valve core 121, and a deformation gap 1c9 is provided between two adjacent abutting convex parts 1c5.

[0248] Before the protruding part 1c5 is inserted into the concave part 1c6, it will be squeezed and deformed with the side of the buckle protrusion 1c4, and the deformation will be released to the deformation gap 1c9 between the protruding parts 1c5, so that the protruding part 1c5 can be inserted into the concave part 1c6 more smoothly. When the protruding part 1c5 is completely inserted into the concave part 1c6, the protruding part 1c5 will recover its deformation, so that it can better match the inner wall of the concave part 1c6.

[0249] The number of the interfering recess 1c6 can be one or more. When there are more interfering recesses 1c6, the interfering protrusion 1c5 and the interfering recess 1c6 can be one-to-one; when there is only one interfering recess 1c6, the interfering recess 1c6 can be arranged to extend in a circumferential annular manner around the buckle protrusion 1c4.

[0250] With such a design, more than two interference protrusions 1c5 are provided to increase the connection points between the buckle groove 1c3 and the snap protrusion 1c4, thereby improving the stability of the structural connection; at the same time, a deformation gap 1c9 is provided between the interference protrusions 1c5 to allow the interference protrusion 1c5 to deform during the snapping process, so that the interference protrusion 1c5 can be more smoothly stuck in the interference recess 1c6.

[0251] According to some embodiments of the present application, optionally, please refer to Fig. 27 A second guide surface 1c8 is circumferentially disposed at one end of the snap protrusion 1c4 away from the sealing portion 1222 , and an area A2 of a cross section of the second guide surface 1c8 gradually decreases in a direction away from the sealing portion 1222 .

[0252] The second guide surface 1c8 is located in the circumference of the end of the snap protrusion 1c4 away from the sealing portion 1222, and is presented as an annular surface. The cross section of the second guide surface 1c8 can be understood as: the second guide surface 1c8 is intercepted by a plane perpendicular to the axis 12c of the valve core 121, and the obtained cross section is the cross section of the second guide surface 1c8. The area A2 of the cross section of the second guide surface 1c8 is smaller as it is farther away from the sealing portion 1222, which indicates that the second guide surface 1c8 is constructed as or similar to a conical surface. In some examples, the end of the snap protrusion 1c4 away from the sealing portion 1222 is chamfered to form the second guide surface 1c8.

[0253] With such a design, a second guide surface 1c8 is provided at one end of the buckle protrusion 1c4 away from the sealing portion 1222, so that when the sealing portion 1222 reseals the injection hole 111, it can be automatically reset to the initial position under the guidance of the second guide surface 1c8, thereby reducing the risk of valve closing failure caused by the buckle protrusion 1c4 abutting against the hole wall of the injection hole 111. According to some embodiments of the present application, optionally, please refer to Fig.28 and Fig.31 A through port 12d is provided on the side of the valve core 121 , and the through port 12d is communicated with the flow chamber 1226 .

[0254] During the injection process, the electrolyte enters the flow cavity 1226 and flows out of the flow cavity 1226 from the through-port 12d; the electrolyte flowing out flows toward the sealing portion 1222, and then flows into the interior of the battery cell 100 from the through-port between the sealing portion 1222 and the end cover 11. The number of through-ports 12d can be one or more. When there are more than one through-ports 12d, all of the through-ports 12d can be distributed at intervals along the circumference of the valve core 121.

[0255] At the same time, when the snap protrusion 1c4 has the second guide surface 1c8 in the above embodiment, the through opening 12d can be located on the side of the second guide surface 1c8 close to the sealing portion 1222. In this way, when the liquid is injected, the electrolyte is dispersed to the surroundings under the action of the second guide surface 1c8, so that the electrolyte is dispersed into the interior of the battery cell 100 from the through openings 12d on all sides.

[0256] With such a design, a through port 12d is provided on the side of the valve core 121, so that a flow passage is formed between the flow chamber 1226, the through port 12d and the sealing portion 1222, thereby achieving effective exhaust or liquid injection.

[0257] According to some embodiments of the present application, optionally, please refer to Fig.31 A drainage channel 12k is provided on the wall of the flow chamber 1226, and the drainage channel 12k extends to the through port 12d along the direction of the axis 12c of the valve core 121.

[0258] The drainage channel 12k refers to a channel formed by the concave on the wall of the filter cavity. When the electrolyte enters the flow cavity 1226, a part of it flows along the wall of the flow cavity 1226 to the through-port 12d, and the other part enters the drainage channel 12k, and smoothly enters the through-port 12d under the action of the drainage channel 12k. In some embodiments, when the buckle protrusion 1c4 is inserted into the buckle groove 1c3 at one end of the flow cavity 1226, the buckle protrusion 1c4 will occupy part of the space in the flow cavity 1226, affecting the flow rate of the electrolyte in the flow cavity 1226. For this reason, the drainage channel 12k is provided on the cavity wall, which can increase the space in the flow cavity 1226 and reduce the influence of the buckle protrusion 1c4 on the flow of the electrolyte in the flow cavity 1226.

[0259] With such a design, a drainage channel 12k is provided on the cavity wall of the flow cavity 1226, so that during the liquid injection process, the electrolyte smoothly enters the through port 12d under the action of the drainage channel 12k, thereby achieving stable liquid injection.

[0260] According to some embodiments of the present application, optionally, please refer to Figure 20 to Figure 25 A valve cavity 1225 is defined in 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 core 121 is at least partially installed in the valve cavity 1225, and a flow channel structure 1214 is defined in the valve core 121, and a flow channel is formed when the flow channel structure 1214 is connected to the flow guide port 1224.

[0261] 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 may be one or more, and the guide port 1224 on the valve body 122 may be one or more. Taking the case where there is one flow channel structure 1214 in the valve core 121 and one guide port 1224 on the valve body 122 as an example, a flow channel is formed when the flow channel structure 1214 is connected to the guide port 1224. In this embodiment, there is only one flow 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 Fig. 22, 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 a flow passage. In this embodiment, the one-way valve 12 has multiple flow passages, and all the flow passages share the same flow channel structure 1214. Taking the flow channel structures 1214 in the valve core 121 as multiple, the guide port 1224 on the valve body 122 as one, and the guide port 1224 is continuously arranged along the circumference of the connecting section 12221 as an example, all the flow channel structures 1214 are arranged at intervals along the circumference of the valve core 121, and each flow channel structure 1214 forms a flow passage when it is connected with the same guide port 1224. In this embodiment, the one-way valve 12 has multiple flow passages, and all the flow passages share the same guide port 1224. Taking the case where there are multiple flow channel structures 1214 in the valve core 121 and multiple flow guide ports 1224 on the valve body 122 as an example, all the flow channel structures 1214 are arranged at intervals along the circumference of the valve core 121, and the flow guide ports 1224 are arranged at intervals along the circumference of the valve body 122, and correspond to all the flow channel structures 1214 one by one, and each flow channel structure 1214 is connected to the corresponding flow guide port 1224 to form a flow passage. In this embodiment, there are multiple flow passages in the one-way valve 12, and each flow passage is independently arranged.

[0262] With such a design, when the valve core 121 is not acted upon by an external force, the valve core 121 is at least partially located in the valve cavity 1225, and the valve core 121 is sealed with the cavity wall of the valve cavity 1225 to improve the sealing performance of the one-way valve 12. When the valve core 121 is acted upon by an external force, the valve core 121 sinks and drives the sealing section 12222 to separate from the end cover 11 to form a flow port. At the same time, the valve core 121 moves under the action of an external force to the flow channel structure 1214 to communicate with the flow guide port 1224 and form a flow channel. Under this design, when the valve core 121 is not acted upon by an external force, the flow channel structure 1214 and the flow guide port 1224 fail to communicate to form a flow channel, and the one-way valve 12 itself has high sealing performance and excellent sealing performance.

[0263] According to some embodiments of the present application, optionally, please refer to Fig.24 The valve core 121 has a valve core cavity 1213 formed therein, and the valve core 121 has a flow channel opening 1212 and a valve core opening 1211 both 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 to form a flow channel structure 1214.

[0264] The valve core port 1211, the valve core cavity 1213 and the flow channel port 1212 respectively refer to a part of the flow channel structure 1214, and the valve core port 1211 and the flow channel port 1212 are respectively used for the structure of the medium entering or discharging the valve core cavity 1213. In some examples, the valve core 121 includes a first valve core 121 section, a second valve core 121 section and a third valve core 121 section, and the first valve core 121 section, the second valve core 121 section and the third valve core 121 section are sequentially arranged along the thickness direction X of the end cover 11, and the second valve core 121 section is connected between the first valve core 121 section and the third valve core 121 section. Among them, the first valve core 121 section is annular, and the valve core port 121 is opened on the end surface of one end of the first valve core 121 section away from the third valve core 121 section. The first valve core 121 section, the second valve core 121 section and the third valve core 121 section are arranged to form a valve core cavity 1213, and the guide port 1224 is defined by the second valve core 121 section. The second valve core 121 section can be a continuous annular structure, on which one or a plurality of flow channel ports 1212 are arranged at intervals along the circumference of the valve core 121. In some embodiments, the second valve core 121 section is a plurality of sections and is spaced along the circumference of the valve core 121, and a flow channel port 1212 is defined between each two adjacent second valve core 121 sections. Each second valve core 121 section extends along the thickness direction X of the end cover 11.

[0265] With such a design, the flow channel structure 1214 is independently provided in the valve core 121, and only the guide port 1224 is provided on the valve body 122, so that the flow channel structure 1214 can form a flow passage when communicating with the guide port 1224. This arrangement is conducive to simplifying the structure of the valve body 122 and the valve core 121, and reducing the manufacturing cost of the one-way valve 12.

[0266] According to some embodiments of the present application, optionally, the valve core 121 includes a first valve core 121 section, a second valve core 121 section and a third valve core 121 section, and the second valve core 121 section is connected between the first valve core 121 section and the third valve core 121 section; the second valve core 121 section 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.

[0267] 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 .

[0268] In addition, in some embodiments, the first valve core 121 section, the second valve core 121 section, and the third valve core 121 section can be combined to form a valve core body 1218 of the valve core 121. At the same time, in the structural design of the valve core 121, for the convenience of extrusion, an extrusion portion 12a can be provided in the circumferential direction of the valve core body 1218. For example, an extrusion portion 12a is provided in the circumferential direction of the first valve core 121 section, and the extrusion portion 12a extends and protrudes along the radial direction of the valve core 121.

[0269] Such a design is simple and easy to operate, and the method of dividing the valve core cavity 1213 into a plurality of valve core sub-cavities 1213 a by designing the second valve core 121 section is convenient for forming the flow channel structure 1214 .

[0270] According to some embodiments of the present application, optionally, the valve core 121 includes a first valve core 121 section, a second valve core 121 section and a third valve core 121 section, and the second valve core 121 section is connected between the first valve core 121 section and the third valve core 121 section; the second valve core 121 section includes at least two and is arranged at intervals along the circumference of the valve core 121.

[0271] Specifically, the second valve core 121 section extends along the thickness direction X of the end cover 11, and a guide port 1224 is formed between each two adjacent second valve core 121 sections. 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, and the one-way valve 12 has multiple flow channel structures 1214, and all the flow channel structures 1214 share the valve core port 1211 and the valve core cavity 1213.

[0272] This design facilitates simplifying the structure of the valve core 121 and reducing the manufacturing cost of the one-way valve 12 .

[0273] According to some embodiments of the present application, optionally, the one-way valve 12 also includes a sealing ring 1d, which is sleeved on the outside of the valve core 121, and the sealing ring 1d is configured to seal with one end of the injection hole 111 facing away from the sealing portion 1222 at least when the sealing portion 1222 is separated from the end cover 11.

[0274] The sealing ring 1d refers to a structure with a through hole inside that can be sleeved on the outside of the valve core 121. It can be a circular ring structure or a hollow columnar structure. At the same time, at least when the injection hole 111 is opened, it can be sealed with one end of the injection hole 111, so that the end of the injection hole 111 close to the sealing part 1222 is opened, and the end away from the sealing part 1222 is sealed by the sealing ring 1d, which can reduce the probability of leakage during injection or formation of exhaust gas, thereby reducing the risk of contamination of the battery 1000. Among them, the material of the sealing ring 1d can be various, such as: it can be but not limited to rubber, plastic, etc. In addition, the sealing ring 1d can abut against one end of the injection hole 111 when the valve is opened, and of course, it can also abut against one end of the injection hole 111 when the valve is closed, that is, the sealing ring 1d always abuts against one end of the injection hole 111. In some embodiments, when the sealing portion 1222 is sealed against the injection hole 111, there is a gap between the second end 12g and one end of the injection hole 111; when a flow port is formed between the sealing portion 1222 and the end cover 11, the second end 12g is sealed against one end of the injection hole 111. In other embodiments, the sealing ring 1d is always sealed against one end of the injection hole 111 facing away from the sealing portion 1222.

[0275] 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, and the extrusion portion 12a protrudes out of the valve core body 1218 along the radial direction of the valve core 121. The sealing ring 1d is sleeved on the valve core body 1218 and is disposed on the side of the extrusion portion 12a facing the sealing portion 1222. In addition, when the side of the extrusion portion 12a facing the valve body 122 is provided with a limiting convex portion 12m surrounding the outer periphery of the valve core body 1218, the limiting convex portion 12m, the extrusion portion 12a and the valve core body 1218 can be enclosed to form an accommodation space, so that the sealing ring 1d can be sleeved on the outer periphery of the valve core body 1218 and partially located in the accommodation space.

[0276] With such a design, a rubber ring is introduced to seal with one end of the injection hole 111 during injection or formation of gas, thereby reducing the probability of leakage during injection or formation of gas, and improving the reliability of the battery 1000.

[0277] According to some embodiments of the present application, optionally, please refer to Fig. 27 The two ends of the sealing ring 1d along the axis 12c of the valve core 121 include a first end 12f and a second end 12g. The first end 12f abuts against the valve core 121, and the second end 12g is used to abut against one end of the injection hole 111 facing away from the sealing portion 1222 at least when a flow port is formed between the sealing portion 1222 and the end cover 11. The wall thickness h of the sealing ring 1d tends to decrease from the first end 12f to the second end 12g.

[0278] The second end 12g of the sealing ring 1d can abut against the injection hole 111 when the valve is opened, providing a seal for the end of the injection hole 111 that is away from the sealing portion 1222. For example: an external force is applied to the valve core 121, so that the sealing portion 1222 is deformed along the direction of the axis 12c of the valve core 121, separated from the end cover 11, and a flow port is formed, so that the interior of the battery cell 100 is connected to the outside world through the flow port and the flow channel in sequence. At the same time, the valve core 121 moves toward one side of the end cover 11 under the action of the external force, so that the second end 12g of the sealing ring 1d abuts against the end of the injection hole 111 that is away from the sealing portion 1222. In this way, during the valve opening and injection, the valve core 121 and the end cover 11 remain sealed, reducing the risk of electrolyte leakage from between the valve core 121 and the end cover 11.

[0279] In addition, the second end 12g of the sealing ring 1d can also abut against one end of the injection hole 111 when the valve is closed, that is, the second end 12g of the sealing ring 1d always abuts against one end of the injection hole 111. When the sealing portion 1222 seals against the injection hole 111, there is a gap between the second end 12g and one end of the injection hole 111; when a flow port is formed between the sealing portion 1222 and the end cover 11, the second end 12g seals against one end of the injection hole 111. In this way, when the sealing portion 1222 is pushed open, the partial abutment force between the second end 12g and the end cover 11 can be reduced, making it easier to open the valve.

[0280] Of course, the second end 12g of the sealing ring 1d always abuts against the end of the injection hole 111 facing away from the sealing part 1222 when the valve is opened or closed, so as to always maintain the sealing between the valve core 121 and the end cover 11; at the same time, through the abutment of the sealing ring 1d, the sealing part 1222 can be subjected to elastic pulling force, so that the sealing part 1222 abuts against the injection hole 111 more closely, providing auxiliary closing force for the sealing of the injection hole 111, and improving the reliability of closing the valve. In addition, the support of the sealing ring 1d can also make the valve core 121 stable and not deflect, so that it can be stably matched on the valve body 122.

[0281] The wall thickness h of the sealing ring 1d decreases from the first end 12f to the second end 12g, which can be understood as: the wall thickness of the sealing ring 1d gradually decreases from the first end 12f to the second end 12g; it can also remain unchanged first and then gradually decrease, etc. The wall thickness of the sealing ring 1d is thinner as it approaches the second end 12g, which means that the deformation capacity at the second end 12g is relatively large. During the valve opening process, it can deform itself to facilitate the valve core 121 to continue to push open the sealing portion 1222. The wall thickness at the first end 12f is relatively large, and the deformation capacity is relatively weak, which can enhance the structural strength of the sealing ring 1d near the valve core 121, reduce the overall collapse or distortion of the valve core 121 when it is squeezed downward, and make the valve opening operation stable.

[0282] In some embodiments, the cross-sectional area of ​​the outer surface of the sealing ring 1d gradually decreases from the first end 12f to the second end 12g. In some specific examples, the outer surface of the sealing ring 1d is a side surface of a truncated cone.

[0283] Such a design introduces a sealing ring 1d, which facilitates sealing between the valve core 121 and the end cover 11 when the valve is opened, thereby reducing the risk of leakage during the injection process; at the same time, the wall thickness of the sealing ring 1d is designed to be thinner as it approaches the second end 12g, thereby facilitating abutment deformation, so that the valve core 121 continues to smoothly push open the sealing portion 1222.

[0284] According to some embodiments of the present application, optionally, please refer to Fig. 27 and Fig.29 The sealing ring 1d includes a first channel 12h and a second channel 12i distributed along the axis 12c of the valve core 121 and sleeved outside the valve core 121. The second channel 12i is closer to the sealing portion 1222 than the first channel 12h. There is a distance 12j between the inner wall of the second channel 12i and the side of the valve core 121.

[0285] The first channel 12h and the second channel 12i are sequentially distributed along the direction of the axis 12c of the valve core 121. During assembly, a portion of the valve core 121 can be inserted into the first channel 12h, and then extended into the second channel 12i, and finally matched with the valve body 122. In order to improve the combination between the sealing ring 1d and the valve core 121, the first channel 12h can be interference-fitted with the valve core 121, that is, the size of the first channel 12h is smaller than the side size of the valve core 121.

[0286] During the valve opening process, the valve core 121 is deformed when squeezing the valve body 122. If the valve core 121 is deformed, it is easy to fit on the inner wall of the second channel 12i, resulting in the blockage or reduction of the flow passage between the valve core 121 and the valve body 122, affecting normal exhaust or injection. For this reason, a spacing 12j is provided between the inner wall of the second channel 12i and the valve core 121, so that the valve core 121 is not easy to fit on the inner wall of the second channel 12i when being squeezed and deformed, thereby allowing stable injection or exhaust.

[0287] With such a design, a gap 12j is left between the inner wall of the second channel 12i and the valve core 121, so that the valve core 121 is not easy to fit against the inner wall of the second channel 12i when being squeezed and deformed, thereby allowing liquid injection or exhaust to proceed stably.

[0288] According to some embodiments of the present application, optionally, please refer to Fig.29 The distance 12j between the inner wall of the second channel 12i and the side surface of the valve core 121 gradually increases from the end of the second channel 12i close to the first channel 12h to the end of the second channel 12i far from the first channel 12h.

[0289] It can be seen that the distance 12j between the inner wall of the second channel 12i and the valve core 121 is larger as it is closer to the sealing portion 1222, which means that the portion of the valve core 121 closer to the sealing portion 1222 has a larger space for deformation. When the valve core 121 squeezes the sealing portion 1222, the portion closer to the sealing portion 1222 will have a relatively larger deformation. Therefore, the distance 12j between the inner wall of the second channel 12i and the valve core 121 can better match the deformation of the valve core 121, which can not only meet the requirement of opening the sealing portion 1222, but also reduce the risk of the flow passage being blocked.

[0290] In some examples, the first channel 12h and the second channel 12i are both circular channels, the inner diameter of the first channel 12h remains unchanged, and the inner diameter of the second channel 12i gradually increases from one end of the second channel 12i close to the first channel 12h to the end of the second channel 12i away from the first channel 12h.

[0291] With such a design, the closer the valve core 121 is to the sealing portion 1222, the larger the space allowed for deformation, thereby achieving the requirement for opening the sealing portion 1222 and reducing the risk of the flow channel being blocked.

[0292] According to some embodiments of the present application, optionally, the valve body 122 further includes a fixing portion 1221 , 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 seals with the end cover 11 .

[0293] The fixing portion 1221 is a structure connected to and sealed with the end cover 11, and is closer to the outer end surface 113 of the end cover 11 than the sealing portion 1222. Figures 15 to 17 The fixing portion 1221 is fixed to the end cover 11, and the fixing portion 1221 always remains in a position relative to the end cover 11 regardless of whether an external force acts on the valve core 121. The fixing portion 1221 may be located in the injection hole 111 and clamped with the hole wall of the injection hole 111; or the fixing portion 1221 may be located on the side of the end cover 11 facing away from the inside of the housing 20 and abut against the outer end surface 113 of the end cover 11.

[0294] It is worth mentioning that in order to reduce the risk of electrolyte leakage, during the injection process, the injection rubber sleeve of the injection nozzle should also seal the fixed part 1221 at the same time, so as to reduce the possibility of electrolyte overflowing from the gap between the injection rubber sleeve of the injection nozzle and the fixed part 1221.

[0295] After the one-way valve 12 is assembled, the battery cell 100 is always sealed with the end cap 11, and the sealing section 12222 is selectively sealed with or disconnected from the end cap 11. In addition, it is worth mentioning that when the fixing portion 1221 and the sealing section 12222 are both sealed with the end cap 11, the valve core 121 and the fixing portion 1221 can also be sealed or spaced apart. Figure 6 and Figure 7 For example, when the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the valve core 121 is also sealed with the fixing portion 1221. For another example, when the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the valve core 121 is spaced apart from the fixing portion 1221.

[0296] Specifically, 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 bevel sealing and / or plane sealing. Bevel sealing means that the surfaces that are sealed between the fixing portion 1221 and the end cover 11 are all inclined surfaces. The inclined surface refers to a surface structure that is inclined relative to the thickness direction X of the end cover 11. Plane sealing means that the surfaces that are sealed between the fixing portion 1221 and the end cover 11 are all planes. The plane refers to a surface structure that is perpendicular to the thickness direction X of the end cover 11. Similarly, the sealing section 12222 and the end cover 11 can also be sealed by means of bevel sealing and / or plane sealing.

[0297] There are many ways to seal the fixing portion 1221 and the end cover 11. Fig.16 For example, the surface of the fixing portion 1221 facing the end cover 11 includes a first sealing area 12211 and a second sealing area 12212. The first sealing area 12211 is arranged around the periphery of the second sealing area 12212, and is arranged and connected along the thickness direction X of the end cover 11. The first sealing area 12211 is an annular plane, and the second sealing area 12212 is an annular inclined surface. The first sealing area 12211 is plane-sealed with the outer end surface 113 of the end cover 11, and the second sealing area 12212 is plane-sealed with the inclined surface of the hole wall of the injection hole 111. The sealing section 12222 is located in the accommodating cavity, and the surface of the sealing section 12222 facing the end cover 11 is plane-sealed with the inner end surface 112 of the end cover 11.

[0298] In other examples, Fig.17 For 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. Fig.18 For example, Fig.18 The sealing method of the fixing part 1221 and the end cover 11 is the same as Fig.17 The sealing method of the fixing portion 1221 is the same as that of the end cover 11, so it will not be repeated here. Fig.17 and Fig.18In the embodiment, the sealing section 12222 is sealed with the inclined surface of the hole wall of the injection hole 111. When exhausting or injecting liquid, the valve core 121 sinks and drives the sealing section 12222 to drive the connecting section 12221 to stretch, and the sealing section 12222 is separated from the hole wall of the injection hole 111 to form a flow port. After exhausting or injecting liquid, the connecting section 12221 recovers its deformation, and the sealing section 12222 is sealed with the inclined surface of the hole wall of the injection hole 111 again.

[0299] 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 arranged. In this way, the sealing portion 1222 and the fixing portion 1221 are both elastic components and are integrally arranged, which is conducive to simplifying the structure of the valve body 122, thereby greatly reducing the manufacturing cost of the one-way valve 12.

[0300] 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, a high injection efficiency, and a low risk of electrolyte leakage.

[0301] According to some embodiments of the present application, optionally, please refer to Fig.17 A bayonet 123 is formed between the fixing portion 1221 and the sealing portion 1222 , and the bayonet 123 is used to snap into the hole wall of the injection hole 111 .

[0302] The bayonet 123 refers to a structure that can realize the snap connection between the hole wall of the injection hole 111 and the valve body 122. It has two inner walls arranged opposite to each other. When the hole wall of the injection hole 111 is inserted into the bayonet 123, the two inner walls are respectively abutted against the upper and lower ends of the injection hole 111.

[0303] 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 .

[0304] With such a design, by providing the bayonet 123 , the end cover 11 and the valve body 122 are easily assembled and tightly matched, which helps to improve the sealing performance between the valve body 122 and the end cover 11 .

[0305] According to some embodiments of the present application, optionally, the flow passage includes a plurality of flow passages, all of which are arranged at intervals around the outer circumference of the valve core 121 and are all connected to the flow port.

[0306] Among them, each flow channel can be set independently of each other, or there can be some overlap, which is not specifically limited here.

[0307] With such a design and the provision of multiple flow passages, the battery cell 100 can be quickly vented or filled with liquid, and the production efficiency is further improved.

[0308] According to some embodiments of this application, please refer to Figure 6 , Fig.12 , Fig.13 , Fig.26 and Fig.34 The present application provides a valve body 122 for assembly in the injection hole 111 of the end cover 11. The valve body 122 includes a sealing portion 1222, the sealing portion 1222 is used to seal with the injection hole 111, and the sealing portion 1222 is used to define a flow passage for communication with the outside at the portion located in the injection hole 111. The sealing portion 1222 is configured to deform under the action of an external force and separate from the end cover 11 to form a flow port, and the flow port is communicated with the flow passage.

[0309] It should be noted that the injection hole 111 of the battery cell 100 refers to a hole structure for injecting electrolyte into the battery cell 100. The injection hole 111 is usually provided on the shell 20 of the battery cell 100, and can be specifically provided on the end cover 11 of the battery cell 100. In the exhaust process of the battery cell 100, the injection hole 111 can achieve the purpose of discharging the gas inside the battery cell 100 to the outside. In the injection process of the battery cell 100, the injection hole 111 can achieve the purpose of injecting electrolyte or other media into the battery cell 100. That is to say, when the injection hole 111 is opened, the internal environment of the battery cell 100 is connected to the external environment through the injection hole 111, and when the injection hole 111 is sealed, the internal environment of the battery cell 100 is in a sealed state.

[0310] The valve body 122 is a structure capable of sealing the injection hole 111, wherein the sealing portion 1222 is at least partially disposed in the injection hole 111 and seals with the hole wall of the injection hole 111. Specifically, the sealing portion 1222 is configured as an elastic component so that the sealing portion 1222 can be deformed under the action of an external force.

[0311] When the sealing part 1222 is sealed with the hole wall of the injection hole 111, a flow passage communicating with the outside is defined between the sealing part 1222 and the hole wall. Further, the sealing part 1222 can be deformed. When the sealing part 1222 is subjected to an external force, the sealing part 1222 has a tendency to move under the action of the external force and deforms. After the deformation, the sealing part 1222 is separated from the hole wall to form a flow port communicating with the flow passage. At this time, the valve body 122 opens the injection hole 111, that is, through the flow passage and the flow port that are connected to each other, the internal environment of the battery cell 100 can be connected with the external environment, so that the gas can be discharged from the battery cell 100, or the electrolyte can enter the battery cell 100.

[0312] When the external force on the sealing portion 1222 disappears, the sealing portion 1222 can recover its deformation under the action of its own elastic potential energy and seal with the hole wall again to close the injection hole 111.

[0313] In addition, it should be noted that the valve body 122 of this embodiment may have the structure of the valve body 122 in the one-way valve 12 in any of the above embodiments.

[0314] Through the above structure, the valve body 122 is used to seal the injection hole 111 of the battery cell 100, and the sealing part 1222 can drive the sealing part 1222 connected thereto to deform under the action of external force, and separate from the hole wall of the injection hole 111 to form a flow port, and the flow port is connected to the flow channel to achieve exhaust or injection, and when the external force disappears, the sealing part 1222 can restore the deformation under the action of its own restoring force, thereby achieving the sealing of the injection hole 111. Therefore, the opening or closing of the injection hole 111 can be flexibly controlled by the valve body 122, thereby improving the water isolation effect and injection efficiency of the battery cell 100.

[0315] According to some embodiments of the present application, optionally, please refer to Figure 5 , Fig.10 and Fig. 27 A deformation recess 1c is formed inwardly on one side of the sealing portion 1222 , and a portion of the sealing portion 1222 located at the periphery of the deformation recess 1c is used to abut against the abutment member 1a of the end cover 11 .

[0316] 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 a contact protrusion 1c1. The contact protrusion 1c1 can be arranged at intervals on the outer periphery of the deformation recess 1c, or it can be in an annular structure, extending around the outer periphery of the deformation recess 1c. When the sealing portion 1222 is subjected to an external force, the contact protrusion 1c1 will also bend and deform on the contact member 1a, so that the portion located in the deformation recess 1c can move toward the contact member 1a, so that the sealing portion 1222 can at least partially separate from the end cover 11 to form a flow port.

[0317] 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. At the same time, the abutment 1a can present a cover-like structure, and the sealing portion 1222 is located inside the abutment 1a, so that the abutment 1a can better abut against the sealing portion 1222 circumferentially. When the sealing portion 1222 is subjected to external force, the sealing portion 1222 can be deformed toward one side of the abutment 1a, and at least part of it is separated from the end cover 11 to form a flow port. Of course, the abutment 1a in this embodiment can be the abutment 1a in the one-way valve 12 in the above embodiment.

[0318] 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 can form a flow opening with the end cover 11 after deforming toward the abutment member 1a.

[0319] Such a design introduces the deformation recess 1c, which facilitates the sealing portion 1222 to deform toward the side of the abutment member 1a, thereby facilitating the opening of the injection hole 111 for exhaust or injection operations.

[0320] According to some embodiments of the present application, optionally, please refer to Figure 5 and Fig.10 The sealing portion 1222 includes a connecting segment 12221 for penetrating the liquid injection hole 111 and a sealing segment 12222 connected to the connecting segment 12221 . The sealing segment 12222 and / or the connecting segment 12221 are used to seal with the liquid injection hole 111 .

[0321] The sealing portion 1222 includes a connecting section 12221 and a sealing section 12222. The connecting section 12221 is located in the injection hole 111 and between the valve core 121 and the sealing section 12222. The sealing section 12222 may be entirely located outside the injection hole 111 or at least partially located inside the injection hole 111. There are many ways to achieve the sealing of the injection hole 111, for example: the surface of the connecting section 12221 is tightly fitted with the hole wall of the 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 crimped onto the inner end face 112 by the abutment 1a, since the crimped portion of the sealing section 12222 cannot be separated from the inner end face 112 of the end cover 11, during structural design, the uncrimped portion of the sealing section 12222 can be separated from the inner end face 112 under the action of an external force to form a flow port, for example: the edge of the sealing section 12222 has a structure extending radially outward, and the abutment 1a crimps the radially outward extending structure onto the inner end face 112, so that a portion of the sealing section 12222 can be separated from the inner end face 112 under the action of an external force. Alternatively, the portion of the sealing section 12222 located in the injection hole 111 is sealed and fitted with the injection hole 111; of course, it can also be a combination of any two or more of the above.

[0322] In some embodiments, please refer to Figure 5 and Figure 8 The sealing section 12222 is located outside the injection hole 111 and is received in the internal environment of the battery cell 100, and the sealing section 12222 presses against the inner end surface 112 of the end cover 11 to achieve a sealed fit. In this embodiment, under the action of an external force, the valve core 121 drives the connecting section 12221 to stretch, so that the sealing section 12222 can move relative to the end cover 11 along the thickness direction X of the end cover 11, and separate from the inner end surface 112 of the end cover 11 to form a flow port. In some embodiments, please refer to Fig.10 The sealing section 12222 is at least partially located in the injection hole 111 and abuts against the hole wall or the hole edge of one end of the injection hole 111 to achieve a sealing fit. In this embodiment, when an external force acts, the valve core 121 drives the connecting section 12221 to stretch, so that the sealing section 12222 can move relative to the end cover 11 along the thickness direction X of the end cover 11, and separate from the hole wall of the injection hole 111 to form a flow port.

[0323] The connection section 12221 and the valve core 121 are designed to be detachable. When the battery cell 100 is exhausted or filled with liquid, the valve core 121 can be removed from the connection section 12221, so that only the valve body 122 is left in the battery cell 100, which can reduce the structure on the battery cell 100. Of course, the connection section 12221 and the valve core 121 can also be designed as an integrated structure.

[0324] With such a design, 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 and / or the connecting section 12221 sinks and separates from the end cover 11 to form a flow port; after exhausting or injecting liquid, the connecting section 12221 restores its deformation, and the sealing portion 1222 is sealed with the end cover 11 again.

[0325] According to some embodiments of the present application, optionally, please refer to Fig.10 and Fig.13 The connecting section 12221 and the valve core 121 are an integrated structure.

[0326] 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 integrally arranged.

[0327] 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.

[0328] Specifically, at least the sealing portion 1222 is an elastic component, and under the action of external force, the valve core 121 drives the sealing portion 1222 to stretch along the thickness direction X of the end cover 11, so that more of the sealing portion 1222 extends into the internal environment of the battery cell 100. Furthermore, the sealing portion 1222 is separated from the inner end surface 112 of the end cover 11 and / or the hole wall of the injection hole 111 to form a flow port.

[0329] 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 external force until it is separated from the end cover 11 to form a flow port. The method of stretching and forming a flow port is simple to operate, and it is convenient to simplify the structure of the one-way valve 12, which greatly reduces the manufacturing cost of the one-way valve 12. When the external force is removed, the sealing portion 1222 restores its deformation, and the sealing portion 1222 is sealed with the end cover 11 again. In this process, the residual electrolyte in the valve core 121 flows into the internal environment of the battery cell 100 through the flow channel, which helps to reduce the crystallization or moisture absorption of the electrolyte in the valve core 121 that affects the performance of the battery cell 100.

[0330] Such a design is helpful to simplify the structure of the valve body 122, thereby significantly reducing the manufacturing cost.

[0331] According to some embodiments of the present application, optionally, please refer to Fig. 27A first guide surface 1c7 is circumferentially provided at one end of the connecting section 12221 away from the sealing section 12222 , and an area A1 of a cross section of the first guide surface 1c7 gradually decreases in a direction away from the sealing section 12222 .

[0332] The first guide surface 1c7 is located in the circumference of the end of the connecting section 12221 away from the sealing section 12222, and is presented as an annular surface. The cross section of the first guide surface 1c7 can be understood as: the first guide surface 1c7 is intercepted by a plane perpendicular to the axis 12c of the valve core 121, and the obtained cross section is the cross section of the first guide surface 1c7. The area A1 of the cross section of the first guide surface 1c7 is smaller as it is farther away from the sealing section 12222, which indicates that the first guide surface 1c7 is constructed as or similar to a conical surface. In some examples, the end of the connecting section 12221 away from the sealing section 12222 is chamfered to form the first guide surface 1c7.

[0333] In this design, a first guide surface 1c7 is provided at one end of the connecting section 12221 away from the sealing section 12222, so that when the sealing section 1222 reseals the injection hole 111, it can automatically reset to the initial position under the guidance of the first guide surface 1c7, thereby reducing the risk of valve closing failure caused by the abutment between the connecting section 12221 and the wall of the injection hole 111.

[0334] According to some embodiments of the present application, optionally, please refer to Fig.16 and Fig.18 The sealing portion 1222 further includes a fixing portion 1221 , which is disposed around the outer periphery of the connecting section 12221 and is spaced apart from the sealing section 12222 . The fixing portion 1221 is used for sealingly cooperating with the injection hole 111 .

[0335] The fixing portion 1221 is a structure connected to and sealed with the end cover 11, and is closer to the outer end surface 113 of the end cover 11 than the sealing portion 1222. Figures 15 to 17 The fixing portion 1221 is fixed to the end cover 11, and the fixing portion 1221 always remains in a position relative to the end cover 11 regardless of whether an external force acts on the valve core 121. The fixing portion 1221 may be located in the injection hole 111 and clamped with the hole wall of the injection hole 111; or the fixing portion 1221 may be located on the side of the end cover 11 facing away from the inside of the housing 20 and abut against the outer end surface 113 of the end cover 11.

[0336] It is worth mentioning that in order to reduce the risk of electrolyte leakage, during the injection process, the injection rubber sleeve of the injection nozzle should also seal the fixed part 1221 at the same time, so as to reduce the possibility of electrolyte overflowing from the gap between the injection rubber sleeve of the injection nozzle and the fixed part 1221.

[0337] After the one-way valve 12 is assembled, the battery cell 100 is always sealed with the end cap 11, and the sealing section 12222 is selectively sealed with or disconnected from the end cap 11. In addition, it is worth mentioning that when the fixing portion 1221 and the sealing section 12222 are both sealed with the end cap 11, the valve core 121 and the fixing portion 1221 can also be sealed or spaced apart. Figure 6 and Figure 7 For example, when the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the valve core 121 is also sealed with the fixing portion 1221. For another example, when the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the valve core 121 is spaced apart from the fixing portion 1221.

[0338] Specifically, 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 bevel sealing and / or plane sealing. Bevel sealing means that the surfaces that are sealed between the fixing portion 1221 and the end cover 11 are all inclined surfaces. The inclined surface refers to a surface structure that is inclined relative to the thickness direction X of the end cover 11. Plane sealing means that the surfaces that are sealed between the fixing portion 1221 and the end cover 11 are all planes. The plane refers to a surface structure that is perpendicular to the thickness direction X of the end cover 11. Similarly, the sealing section 12222 and the end cover 11 can also be sealed by means of bevel sealing and / or plane sealing.

[0339] There are many ways to seal the fixing portion 1221 and the end cover 11. Fig.15 For example, the surface of the fixing portion 1221 facing the end cover 11 includes a first sealing area 12211 and a second sealing area 12212. The first sealing area 12211 is arranged around the periphery of the second sealing area 12212, and is arranged and connected along the thickness direction X of the end cover 11. The first sealing area 12211 is an annular plane, and the second sealing area 12212 is an annular inclined surface. The first sealing area 12211 is plane-sealed with the outer end surface 113 of the end cover 11, and the second sealing area 12212 is plane-sealed with the inclined surface of the hole wall of the injection hole 111. The sealing section 12222 is located in the accommodating cavity, and the surface of the sealing section 12222 facing the end cover 11 is plane-sealed with the inner end surface 112 of the end cover 11.

[0340] In other examples, Fig.17 For 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. Fig.18 For example, Fig.18 The sealing method of the fixing part 1221 and the end cover 11 is the same as Fig.17The sealing method of the fixing portion 1221 is the same as that of the end cover 11, so it will not be repeated here. Fig.17 and Fig.18 In the embodiment, the sealing section 12222 is sealed with the inclined surface of the hole wall of the injection hole 111. When exhausting or injecting liquid, the valve core 121 sinks and drives the sealing section 12222 to drive the connecting section 12221 to stretch, and the sealing section 12222 is separated from the hole wall of the injection hole 111 to form a flow port. After exhausting or injecting liquid, the connecting section 12221 recovers its deformation, and the sealing section 12222 is sealed with the inclined surface of the hole wall of the injection hole 111 again.

[0341] 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 arranged. In this way, the sealing portion 1222 and the fixing portion 1221 are both elastic components and are integrally arranged, which is conducive to simplifying the structure of the valve body 122, thereby greatly reducing the manufacturing cost of the one-way valve 12.

[0342] 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, a high injection efficiency, and a low risk of electrolyte leakage.

[0343] According to some embodiments of the present application, optionally, please refer to Figure 32 to Figure 34 The fixing portion 1221 , the connecting section 12221 and the sealing section 12222 form a bayonet 123 , which is used to clamp the hole wall of the injection hole 111 .

[0344] The bayonet 123 refers to a structure that can realize the snap connection between the hole wall of the injection hole 111 and the valve body 122. It has two inner walls arranged opposite to each other. When the hole wall of the injection hole 111 is inserted into the bayonet 123, the two inner walls are respectively abutted against the upper and lower ends of the injection hole 111.

[0345] 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 .

[0346] With such a design, by providing the bayonet 123 , the end cover 11 and the valve body 122 are easily assembled and tightly matched, which helps to improve the sealing performance between the valve body 122 and the end cover 11 .

[0347] According to some embodiments of the present application, optionally, please refer to Fig.34A guide hole 124 is provided on the fixing portion 1221 , and a connecting groove 12n connected to the guide hole 124 is provided on the surface of the connecting section 12221 . The guide hole 124 and the connecting groove 12n together form a flow passage.

[0348] Specifically, a guide hole 124 is provided on the fixing portion 1221, and the guide hole 124 is provided through the preset direction T. A connection groove 12n is provided on the surface of the sealing portion 1222 facing the hole wall, that is, the notch of the connection groove 12n faces the hole wall of the injection hole 111. One end of the guide hole 124 along the preset direction T is connected to the connection groove 12n, and the other end is connected to the external environment.

[0349] The flow guide hole 124 is interconnected with the connection groove 12n to form a flow passage. In the initial state, the fixing portion 1221 and the sealing section 12222 are both sealed with the hole wall. When the sealing portion 1222 is subjected to an external force, it deforms. At this time, the sealing section 12222 is separated from the hole wall to form a flow port. The flow port is interconnected with the connection groove 12n, thereby realizing the connection between the flow port and the flow passage.

[0350] Through the above structure, the flow passage can be smoothly realized, and through the connection between the connecting groove 12n and the flow port, the flow passage and the flow port can be smoothly connected, thereby realizing the exhaust or liquid injection process of the battery cell 100.

[0351] According to some embodiments of the present application, optionally, please refer to Fig.33 The guide hole 124 includes at least two sub-holes 12p, each sub-hole 12p is arranged at intervals along the circumference of the fixing portion 1221, and all the sub-holes 12p are connected to the connecting groove 12n.

[0352] The guide hole 124 may include two sub-holes 12p or a plurality of sub-holes 12p, and the sub-holes 12p are evenly and spaced apart along the circumference of the fixing portion 1221, and each sub-hole 12p is connected to the connecting groove 12n.

[0353] Therefore, each sub-hole 12p can form a flow channel with the connecting groove 12n. When the sealing section 12222 is separated from the hole wall to form a flow port, multiple flow channels are respectively connected to the flow port, thereby realizing the exhaust or injection process at the same time, which can effectively improve the exhaust efficiency or injection efficiency.

[0354] According to some embodiments of the present application, optionally, the valve body 122 has a valve closing position and a valve opening position. When the valve body 122 is in the valve closing position, the fixing portion 1221 and the sealing section 12222 are both sealed with the hole wall of the injection hole 111; when the valve body 122 is in the valve opening position, the fixing portion 1221 is sealed with the hole wall of the injection hole 111, and the sealing section 12222 is separated from the hole wall of the injection hole 111 to form a flow port.

[0355] Specifically, the valve body 122 can be configured as an elastic valve body 122, or the sealing portion 1222 in the valve body 122 can be configured as an elastic structure. Thus, the valve body 122 can switch between the valve closing position and the valve opening position under the action of external force or its own elastic potential energy.

[0356] In the initial state, that is, when the valve body 122 is not subjected to external force, the valve body 122 is in the closed position. At this time, the fixing portion 1221 and the sealing section 12222 are both sealed with the hole wall of the injection hole 111 to seal the injection hole 111, so that the internal environment of the battery cell 100 is isolated from the external environment.

[0357] Applying external force to the valve body 122 causes the sealing portion 1222 to deform, and the valve body 122 switches from the valve closing position to the valve opening position. At this time, the fixing portion 1221 is sealed with the hole wall, and the sealing section 12222 is separated from the hole wall under the deformation to form a flow port, and the connecting groove 12n is connected with the flow port, and the internal environment of the battery cell 100 is connected with the external environment through the flow channel and the flow port, so as to discharge the gas inside the battery cell 100 or inject electrolyte into the battery cell 100.

[0358] When the external force on the valve body 122 disappears, the sealing portion 1222 can restore its deformation under the action of its own elastic potential energy, thereby restoring the sealing cooperation with the hole wall, thereby achieving the purpose of automatically switching the valve body 122 from the open valve position to the closed valve position.

[0359] Thus, an external force is applied to the valve body 122 to switch the valve body 122 to the open valve position, and when the external force is removed, the valve body 122 can switch to the closed valve position in time under the action of its own elastic potential energy, thereby achieving flexible and timely sealing of the valve body 122 and improving the water-isolating effect of the valve body 122.

[0360] According to some embodiments of the present application, optionally, please refer to Fig.35 The sealing section 12222 includes a first surface 125 and a second surface 126 which are sequentially arranged along a preset direction T. The first surface 125 is connected to the connecting section 12221 and is parallel to the preset direction T. One end of the second surface 126 is connected to the first surface 125, and the other end is inclined toward the direction of the hole wall close to the injection hole 111; wherein the first surface 125 is used for interference fit with the hole wall of the injection hole 111, and the second surface 126 is used for abutting against the hole wall of the injection hole 111, and the preset direction T is configured as the direction in which the valve body 122 is inserted into the injection hole 111.

[0361] Specifically, the first surface 125 and the second surface 126 are both disposed toward the end cover 11, and the first surface 125 is parallel to the preset direction T, that is, the first surface 125 is parallel to the thickness direction X of the end cover 11. When the valve body 122 is disposed in the injection hole 111, the first surface 125 and the hole wall of the injection hole 111 are interference-fitted, thereby realizing the first sealing between the valve body 122 and the end cover 11.

[0362] Furthermore, the second surface 126 is connected to the lower end of the first surface 125 and is inclined toward the end cover 11, that is, the second surface 126 is configured as an inclined surface. When the valve body 122 is disposed in the injection hole 111, the second surface 126 can abut against the inner end surface 112 of the end cover 11 upward to achieve a second seal with the end cover 11.

[0363] Therefore, through the above structure, the first surface 125 and the second surface 126 are respectively sealed with the end cover 11, so as to achieve double sealing between the valve body 122 and the end cover 11, thereby improving the sealing effect.

[0364] According to some embodiments of the present application, optionally, please refer to Fig.34 and Fig.35 A valve cavity 1225 is defined in the valve body 122, and the valve cavity 1225 is used to accommodate a force-applying member for providing an external force.

[0365] Specifically, when the sealing portion 1222 is disposed in the injection hole 111, the valve port 1223 of the valve cavity 1225 is disposed toward the outside of the battery cell 100. At least a portion of the force-applying member is accommodated in the valve cavity 1225, so that the force-applying member can be connected to the sealing portion 1222. At this time, an external force is applied to the sealing portion 1222 by the force-applying member, so that the sealing portion 1222 can be deformed under the action of the external force, thereby separating from the hole wall to form a flow port.

[0366] Furthermore, the sealing portion 1222 is pressed downward by the force-applying member so that the sealing portion 1222 tends to move toward the interior of the battery cell 100. At this time, the sealing segment 12222 moves downward driven by the sealing portion 1222, so that the sealing segment 12222 is separated from the hole wall to form a flow port, and the flow port is connected to the flow channel. At this time, the valve body 122 is in the open valve position.

[0367] When the external force on the force-applying member is removed, the acting force between the force-applying member and the sealing portion 1222 disappears, the sealing portion 1222 recovers its deformation under the action of its own elastic potential energy, the sealing section 12222 seals with the hole wall again, and the valve body 122 switches to the valve closing position.

[0368] Among them, the force-applying member can be but is not limited to being set as a valve core 121, and the outer contour of at least part of the valve core 121 matches the shape of the valve cavity 1225, so that at least part of the valve core 121 can be more stably accommodated in the valve cavity 1225.

[0369] By providing a valve cavity 1225 capable of accommodating a force-applying member, it is convenient to apply an external force to the sealing portion 1222 through the force-applying member, thereby causing the sealing portion 1222 to deform and separate from the hole wall to form a flow port.

[0370] like Fig.36 As shown, in some embodiments, the valve cavity 1225 has a first cavity 127 and a second cavity 128 that are interconnected, the first cavity 127 is disposed on one side of the valve port 1223 of the valve cavity 1225, and the second cavity 128 is disposed on one side of the cavity bottom wall of the valve cavity 1225. The diameter D1 of the first cavity 127 is smaller than the diameter D2 of the second cavity 128.

[0371] The first cavity 127 is connected between the second cavity 128 and the valve port 1223. The second cavity 128 can better accommodate the force-applying member, and the force-applying member is limited by the first cavity 127, thereby reducing the probability of the force-applying member escaping from the valve cavity 1225 and improving the connection stability between the force-applying member and the sealing portion 1222.

[0372] Specifically, the shape of at least part of the force-applying member is matched with the shape of the valve cavity 1225, that is, the force-applying member has a first part 201 and a second part 202 which are connected to each other, the second part 202 is accommodated in the second cavity 128, and the first part 201 is accommodated in the first cavity 127. Since the diameter of the first cavity 127 is smaller than the diameter of the second cavity 128, the second part 202 can be confined in the second cavity 128. Therefore, the force-applying member can be stably confined in the valve cavity 1225, so that the force-applying member and the sealing portion 1222 are more stably connected, which facilitates the force-applying member to better apply external force to the sealing portion 1222.

[0373] Please see again Fig.35 and Fig.36 Based on the same concept as the above-mentioned valve body 122, the present application also provides a one-way valve 12 for sealing the injection hole 111 of the battery cell 100. The one-way valve 12 includes a valve core 121 and the valve body 122 as above. At least part of the valve core 121 is equipped with the valve body 122, and the valve core 121 can drive the sealing part 1222 of the valve body 122 to deform and separate from the hole wall of the injection hole 111 to form a flow port under the action of external force.

[0374] Specifically, at least a portion of the valve core 121 is accommodated and confined in the valve cavity 1225 of the valve body 122 , so that the valve core 121 and the valve body 122 are stably connected.

[0375] When pressure is applied to the valve core 121, the valve core 121 drives the valve body 122 to move downward, causing the sealing portion 1222 to deform. Under the deformation, the sealing section 12222 separates from the hole wall of the injection hole 111 to form a flow port, and the flow channel is connected to the flow port, so that the valve body 122 is in the valve opening position. At this time, the gas inside the battery cell 100 can be discharged, or electrolyte can be injected into the battery cell 100.

[0376] When exhaust or injection is completed, the external force on the valve core 121 is removed. At this time, the sealing portion 1222 recovers its deformation under the action of its own elastic potential energy, and the sealing section 12222 and the hole wall are re-sealed to make the interior of the battery cell 100 in a sealed state.

[0377] Therefore, by providing the one-way valve 12 , the timely opening and closing of the injection hole 111 of the battery cell 100 can be flexibly controlled, which is convenient for performing exhaust or injection operations and can improve the water-isolating effect of the injection hole 111 .

[0378] According to some embodiments of the present application, optionally, a valve port 1223 and a guide port 1224 both in communication with the valve cavity 1225 are provided on the valve body 122 , and the valve port 1223 is used for inserting a force-applying member into the valve cavity 1225 .

[0379] The valve port 1223 and the guide port 1224 are respectively connected to the valve cavity 1225, so that the force-applying member can act on the valve cavity 1225 through the valve port 1223; at the same time, the medium can enter the valve cavity 1225 or be discharged from the valve cavity 1225 through the guide port 1224. Among them, the force-applying member can be the valve core 121 in any of the above embodiments. For ease of understanding, the force-applying member is taken as the valve core 121 as an example for explanation. The valve core 121 can be partially located in the valve cavity 1225, and the rest of it extends out of the valve port 1223, or the valve core 121 can also be completely located in the valve cavity 1225. In order to improve the reliability of the valve core 121 drive, the rest of the valve core 121 is extended out of the valve port 1223, so that 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.

[0380] The sealing portion 1222 includes a connecting section 12221 and a sealing section 12222. In some embodiments, the connecting section 12221 may be a continuous annular structure, on which one or more guide ports 1224 are provided at intervals along the circumference of the valve body 122. Fig.18There are multiple connecting sections 12221 and they are spaced apart along the circumference of the valve body 122, and a guide port 1224 is defined between each two adjacent connecting sections 12221. Each connecting section 12221 can extend along the thickness direction X of the end cover 11 or along the radial direction of the injection hole 111.

[0381] The number of the guide ports 1224 may be one or more, and may be specifically set according to needs.

[0382] Taking the case where the flow chamber 1226 is not divided into the flow sub-chamber 1227 and there is only one flow guide port 1224 as an example, the valve port 1223, the flow chamber 1226 and the flow guide port 1224 are sequentially connected to form a flow passage. In this embodiment, the one-way valve 12 has only one flow passage.

[0383] Taking the case where the flow chamber 1226 is not divided to form a flow sub-chamber 1227, and there are multiple flow guide ports 1224 that are arranged at circumferential intervals along the valve body 122 as an example, the valve port 1223, the flow chamber 1226 and each flow guide port 1224 are connected in sequence to form a flow channel. In this embodiment, there are multiple flow channels in the one-way valve 12, and all the flow channels share the valve port 1223 and the flow chamber 1226.

[0384] Taking the case where the flow chamber 1226 is divided into flow sub-chambers 1227, and the flow guide port 1224 is one and extends along the circumference of the valve body 122 as an example, the valve port 1223, each flow sub-chamber 1227 and the flow guide port 1224 are connected in sequence to form a flow passage. In this embodiment, the one-way valve 12 has multiple flow passages, and all the flow passages share the valve port 1223 and the flow guide port 1224.

[0385] Taking the example that the flow chamber 1226 is divided to form a flow sub-chamber 1227, and the flow sub-chamber 1227 corresponds to the flow guide port 1224 one by one, the valve port 1223, the flow sub-chamber 1227 and the flow guide port 1224 corresponding to the flow sub-chamber 1227 are connected in sequence to form a flow channel. In this embodiment, the one-way valve 12 has multiple flow channels, and all the flow channels only share the valve port 1223.

[0386] With this design, the valve port 1223, the flow chamber 1226 and the guide port 1224 are always connected. When the sealing portion 1222 is deformed by an external force and separated from the end cover 11 to form a flow port, the flow channel is directly connected to the flow port to facilitate subsequent exhaust and liquid injection.

[0387] According to some embodiments of the present application, optionally, the valve cavity 1225 has a first cavity 127 and a second cavity 128 that are interconnected, the first cavity 127 is arranged on the valve port 1223 side of the valve cavity 1225, and the second cavity 128 is arranged on the bottom wall side of the valve cavity 1225; wherein the diameter of the first cavity 127 is smaller than the diameter of the second cavity 128.

[0388] Specifically, the first valve core 121 section, the second valve core 121 section and the third valve core 121 section are all set to a cylindrical structure, and the first valve core 121 section, the second valve core 121 section and the third valve core 121 section are connected in sequence along the thickness direction X of the end cover 11, that is, the second valve core 121 section is connected between the first valve core 121 section and the third valve core 121 section.

[0389] Furthermore, in order to make the third valve core 121 section and the valve cavity 1225 more stably engaged, the internal contour of the valve cavity 1225 is set to match the shapes of the second valve core 121 section and the third valve core 121 section. Thus, the third valve core 121 section is engaged in the second cavity 128, and at this time, at least part of the second valve core 121 section is located in the first cavity 127, so that the valve core 121 and the valve body 122 can be stably engaged, reducing the probability of separation between the valve core 121 and the valve body 122.

[0390] Through the above structure, the valve core 121 can be more stably inserted into the valve body 122, so that the valve core 121 and the valve body 122 are stably connected, which makes it easier for the valve core 121 to drive the valve body 122 to move smoothly and realize the smooth opening and closing of the valve assembly.

[0391] In some embodiments, please refer to Fig.35 , the diameter D4 of the second valve core 121 section is smaller than the diameter D3 of the first valve core 121 section and the diameter D5 of the third valve core 121 section.

[0392] Specifically, the first valve core 121 section, the second valve core 121 section and the third valve core 121 section are all configured as cylindrical structures, and the second valve core 121 section is connected between the first valve core 121 section and the third valve core 121 section.

[0393] In order to enable the third valve core 121 section to be more stably engaged in the second cavity 128 , the diameter of the first cavity 127 is smaller than the diameter of the second cavity 128 , and the diameter of the first cavity 127 matches the diameter of the second valve core 121 section.

[0394] The diameter of the second valve core 121 section is smaller than the diameter of the third valve core 121 section, and the diameter of the second valve core 121 section is smaller than the diameter of the first valve core 121 section. When the third valve core 121 section is clamped in the second cavity 128, the first cavity 127 can limit the third valve core 121 section, and limit the third valve core 121 section in the second cavity 128. When the valve core 121 is subjected to a downward external force, since the diameter of the first cavity 127 matches the diameter of the second valve core 121 section, the second valve core 121 section can move up and down in the first cavity 127, thereby driving the third valve core 121 section to press downward against the bottom wall of the second cavity 128, so as to drive the sealing portion 1222 of the valve body 122 to stretch downward, thereby separating from the end cover 11 to form a flow port.

[0395] Through the above structure, the valve core 121 can be stably connected to the valve body 122, so that when the valve core 121 is subjected to external force, the valve body 122 can be smoothly stretched along the thickness direction X of the end cover 11 to separate from the end cover 11 to form a flow port, thereby smoothly opening the valve.

[0396] According to some embodiments of this application, please refer to Figure 4 The present application provides an end cover assembly 10, which includes: an end cover 11, which is provided with a liquid injection hole 111 along its thickness direction X; and a one-way valve 12 as any of the above items, wherein a valve body 122 is assembled in the liquid injection hole 111.

[0397] According to some embodiments of this application, please refer to Figure 4 The present application provides an end cover assembly 10, which includes: an end cover 11, which is provided with a liquid injection hole 111 along its thickness direction X; and a valve body 122 such as any of the above items, which is assembled in the liquid injection hole 111.

[0398] The end cover assembly 10 provided in the present application has the effects brought by any of the above-mentioned embodiments, so it will not be described in detail here.

[0399] The end cover assembly 10 provided in the present application has the effects brought by any of the above-mentioned embodiments, so it will not be described in detail here.

[0400] According to some embodiments of the present application, optionally, please refer to Figure 5 A sealing protrusion 114 is convexly provided on the end cover 11 . The sealing protrusion 114 extends around the outer circumference of the injection hole 111 , and the sealing protrusion 114 abuts against the sealing portion 1222 .

[0401] The sealing protrusion 114 refers to an annular structure extending around the outer periphery of the injection hole 111. When the sealing portion 1222 is assembled in the injection hole 111, the sealing protrusion 114 will abut against the sealing portion 1222, so that the sealing portion 1222 has a certain pre-compression state. At the same time, the sealing protrusion 114 is annularly arranged on the outer periphery of the injection hole 111, which can be equivalent to extending the axial length of the injection hole 111, allowing a larger one-way valve 12 to be assembled. In addition, the sealing protrusion 114 can also be sealed and fitted with the sealing portion 1222 to further improve the sealing performance.

[0402] With such a design, a sealing protrusion 114 is provided on the outer periphery of the 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 injection hole 111 is effectively extended, and the installation stability of the valve body 122 in the injection hole 111 is improved.

[0403] 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 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 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.

[0404] The sealing part 1222 is an elastic component, such as a rubber material, etc., which is separated from the end cover 11 by deformation such as contraction and elongation under the action of external force to form a flow port. When the external force is removed, the sealing part 1222 automatically recovers its deformation and re-seals with the end cover 11. It should be noted that when the external force is removed, there is a certain pre-pressure between the sealing part 1222 and the end cover 11, so that the rebound force of the sealing part 1222 can provide a sealing force, thereby improving the sealing effect of the injection hole 111.

[0405] Exemplarily, the sealing portion 1222 can achieve a sealed fit between the sealing portion 1222 and the end cover 11 by abutting against the hole wall of the injection hole 111. In this embodiment, a flow outlet is formed when the sealing portion 1222 is separated from the hole wall of the injection hole 111; and / or, the sealing portion 1222 can also achieve a sealed fit between the sealing portion 1222 and the end cover 11 by being received in the internal environment of the battery cell 100 and abutting against the inner end surface 112 of the end cover 11. In this embodiment, a flow outlet is formed when the sealing portion 1222 is separated from the inner end surface 112 of the end cover 11.

[0406] It is worth mentioning that the sealing portion 1222 of this embodiment can be the sealing portion 1222 in any of the above embodiments, which will not be described here. At the same time, when the injection hole 111 is opened, the sealing portion 1222 is deformed by external force, and is separated from the end cover 11 to form a flow port. Among them, there are many ways to act on the sealing portion 1222, such as: using the valve core 121 in any of the above embodiments, the valve core 121 is at least partially matched on the sealing portion 1222, and the sealing portion 1222 is driven to deform toward the inside of the battery cell 100. Among them, the valve core 121 and the sealing portion 1222 can be detachably matched, so that after the exhaust or injection is completed, the valve core 121 can be removed from the valve body 122.

[0407] With such a design, by providing a one-way valve 12 at the injection hole 111 of the end cover 11 , the external impact on the internal environment of the battery cell 100 during the production process of the battery 1000 can be effectively reduced, thereby improving the water-proof effect and injection efficiency of the battery cell 100 .

[0408] 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 cover assemblies 10 .

[0409] According to some embodiments of this application, please refer to Fig.37 The present application provides a method for preparing a battery cell 100, the method comprising the following steps:

[0410] S100, assembling the valve body 122 in the injection hole 111 from one side of the end cover 11 along its thickness direction X, and making the valve body 122 at least partially seal with the hole wall of the injection hole 111;

[0411] S200, insert the valve core 121 into the injection hole 111 from the other side of the end cover 11 along its thickness direction X, and mate with the valve body 122;

[0412] S300, sealing the end cover 11 on the housing 20 of the battery cell 100;

[0413] S400 , pressing the valve core 121 to cause the valve body 122 to deform and separate from the end cover 11 , so as to complete the exhaust and / or liquid injection operation.

[0414] In step S100, the valve body 122 is at least partially assembled in the injection hole 111, so that a part of the valve body 122 can close one end of the injection hole 111 to achieve effective sealing. There are many ways to fix the valve body 122 in the injection hole 111, for example, an abutment 1a can be provided on the inner end surface 112 of the end cover 11, and the valve body 122 is pressed onto the end cover 11 by the abutment 1a; or, the valve body 122 can be designed as a connecting section 12221, a sealing section 12222 and a fixing portion 1221, the fixing portion 1221 and the sealing section 12222 are spaced apart from the connecting section 12221, and enclosed to form a bayonet 123, and the bayonet 123 can be inserted into a part of the hole wall of the injection hole 111, etc.

[0415] In step S400, if exhaust or injection operation is required, the valve core 121 can be pressed, and the valve body 122 can be deformed toward the inside of the battery cell 100 through the valve core 121, so that the valve body 122 is separated from the end cover 11, and the injection hole 111 is opened, so that the inside and outside of the battery cell 100 are connected through the injection hole 111. If it is necessary to transfer to the next process, the pressing of the valve core 121 can be cancelled, so that the valve body 122 can be restored to its original shape and re-sealed on the injection hole 111 to achieve effective water isolation.

[0416] With such a design, by arranging the valve body 122 and the valve core 121 at the injection hole 111 of the end cover 11 , the external influence on the internal environment of the battery cell 100 during the production process of the battery 1000 can be effectively reduced, thereby improving the water-proof effect and injection efficiency of the battery cell 100 .

[0417] According to some embodiments of the present application, optionally, the method further includes the following steps:

[0418] S500, after the injection operation is completed, the valve core 121 is removed from the end cover 11;

[0419] S600, the buckle protrusion 1c4 of the valve body 122 located in the injection hole 111 is cut off, and the end of the injection hole 111 facing away from the housing 20 is sealed.

[0420] It can be seen that after the liquid injection operation is completed, the valve core 121 can be removed, so that the valve body 122 replaces the traditional sealing structure, thereby improving the water-proof performance of the liquid injection hole 111. At the same time, if the valve body 122 has a snap-on protrusion 1c4 that is snap-connected with the valve core 121, the snap-on protrusion 1c4 can be cut off to reduce the height of the valve body 122 protruding in the liquid injection hole 111. In addition, after cutting off the snap-on protrusion 1c4, the end of the liquid injection hole 111 facing away from the housing 20 can be sealed, for example: inserting a sealing rubber, welding a sealing member 13, such as a sealing nail, etc., to achieve double water-proofing.

[0421] With such a design, the valve body 122 is retained to serve as a sealing structure, thereby achieving the reuse of the structure and improving the water-proof performance of the battery cell 100 .

[0422] According to some embodiments of the present application, the present application provides a battery 1000 including the above battery cell 100 .

[0423] 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.

[0424] According to some embodiments of this application, please refer to Figures 1 to 37 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 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 an external force until it is separated from the end cover 11 to form a flow port, and the flow port is connected to the flow channel.

[0425] It can be seen that in the present application, when the valve core 121 is not subjected to external force, the sealing portion 1222 seals with the end cover 11 and blocks the flow channel and the internal environment of the battery cell 100. In this way, the medium cannot be exchanged between the outside and the internal environment of the battery cell 100, that is, exhaust or injection is impossible. The internal environment of the battery cell 100 is minimally affected by the outside, and the water-proof effect is good. Therefore, in the subsequent injection process, there is no need to evacuate the battery cell 100, and the injection efficiency is high. When the valve core 121 is subjected to external force, the sealing portion 1222 separates from the end cover 11 and forms a flow port, which is connected to the flow channel. Therefore, the water vapor formed by the evaporation of water in the electrode assembly 30 can be discharged to the outside through the flow port and the flow channel to achieve exhaust. In addition, the electrolyte can also flow into the internal environment of the battery cell 100 through the flow channel and the flow port and achieve injection. Therefore, by providing a one-way valve 12 at the injection hole 111 of the end cover 11 , the external impact on the internal environment of the battery cell 100 during the production process of the battery 1000 can be effectively reduced, thereby improving the water isolation effect and injection efficiency of the battery cell 100 .

[0426] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A one-way valve for sealing or opening a liquid injection hole (111) of an end cover (11), characterized in that: The one-way valve comprises: Valve core (121); The valve body (122) is used to be assembled in the liquid injection hole (111), and comprises a sealing portion (1222), wherein the sealing portion (1222) is used to seal and cooperate with the liquid injection hole (111), and the valve core (121) is matched with the valve body (122) and defines 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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 claim 3, characterized in that: 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 an 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); and / or, 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).

7. The one-way valve according to claim 2, characterized in that: The one-way valve further comprises an insulating cover (1b), wherein the insulating cover (1b) is disposed on the abutment member (1a).

8. The one-way valve according to claim 1, characterized in that: 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).

9. The one-way valve according to claim 8, characterized in that: 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).

10. The one-way valve according to claim 8, characterized in that: 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).

11. The one-way valve according to claim 8, characterized in that: 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).

12. The one-way valve according to claim 8, characterized in that: A drainage channel (1c2) is provided on a surface of the sealing section (12222) facing the connecting section (12221), and the flow port is connected to the drainage channel (1c2).

13. The one-way valve according to claim 8, characterized in that: A first guide surface (1c7) is circumferentially provided at one end of the connecting section (12221) away from the sealing section (12222), and an area A1 of a cross section of the first guide surface (1c7) gradually decreases in a direction away from the sealing section (12222).

14. The one-way valve according to any one of claims 1 to 13, characterized in that: 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) and can lead to the sealing portion (1222). The flow chamber (1226) and the sealing portion (1222) define the flow channel.

15. The one-way valve according to claim 14, characterized in that: 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 14, characterized in that: 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, characterized in that: 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 16, characterized in that: A baffle (12e) is convexly provided on a side of the extrusion portion (12a) facing away from the valve body (122), and the baffle (12e) is arranged in a ring shape around the outer circumference of the flow chamber (1226).

19. The one-way valve according to claim 16, characterized in that: The extrusion portion (12a) is provided with a limiting protrusion (12m) on one side facing the valve body (122), and the limiting protrusion (12m) surrounds the outer periphery of the valve core body (1218) and is used for abutting against the end cover (11).

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

21. The one-way valve according to claim 14, characterized in that The flow chamber (1226) is arranged inside the valve core (121), and one end of the flow chamber (1226) close to the sealing portion (1222) is constructed as a buckle groove (1c3); the sealing portion (1222) is provided with a buckle protrusion (1c4) for being buckled in the buckle groove (1c3).

22. The one-way valve according to claim 21, characterized in that An abutting convex portion (1c5) is convexly provided on the inner wall of the buckle groove (1c3), and an abutting concave portion (1c6) is provided on one side of the buckle protrusion (1c4), and the abutting convex portion (1c5) abuts against the inner wall of the abutting concave portion (1c6).

23. The one-way valve according to claim 22, characterized in that The abutting convex parts (1c5) include more than two abutting convex parts (1c5), all of the abutting convex parts (1c5) are distributed at intervals around the axis (12c) of the valve core (121), and a deformation gap (1c9) is provided between two adjacent abutting convex parts (1c5).

24. The one-way valve according to claim 22, characterized in that A second guide surface (1c8) is circumferentially provided at one end of the snap-fit ​​protrusion (1c4) away from the sealing portion (1222), and an area A2 of a cross section of the second guide surface (1c8) gradually decreases in a direction away from the sealing portion (1222).

25. The one-way valve according to claim 21, characterized in that A through hole (12d) is provided on the side surface of the valve core (121), and the through hole (12d) is communicated with the flow chamber (1226).

26. The one-way valve according to claim 25, characterized in that A drainage channel (12k) is provided on the cavity wall of the flow cavity (1226), and the drainage channel (12k) extends along the direction of the axis (12c) of the valve core (121) to the through port (12d).

27. The one-way valve according to any one of claims 1 to 13, characterized in that: A valve cavity (1225) is provided in the valve body (122), and a valve port (1223) and a flow guide port (1224) are provided on the valve body (122), both of which are connected to the valve cavity (1225); the valve core (121) is at least partially installed in the valve cavity (1225), and a flow channel structure (1214) is provided in the valve core (121), and the flow channel is formed when the flow channel structure (1214) is connected to the flow guide port (1224).

28. The one-way valve according to claim 27, characterized in that A valve core cavity (1213) is provided in the valve core (121), and a flow channel opening (1212) and a valve core opening (1211) are provided on the valve core (121), both of which are connected to the valve core cavity (1213); the valve core opening (1211), the valve core cavity (1213) and the flow channel opening (1212) are connected in sequence and are constructed to form the flow channel structure (1214).

29. The one-way valve according to claim 28, characterized in that The valve core (121) comprises a first valve core section (1215), a second valve core section (1216) and a third valve core section (1217), wherein the second valve core section (1216) is connected between the first valve core section (1215) and the third valve core section (1217); The second valve core section (1216) includes at least two, which are intersectingly arranged in the valve core cavity (1213) and divide the valve core cavity (1213) into a plurality of valve core sub-cavities (1213a), and the valve core port (1211) is connected to the valve core sub-cavity (1213a) to form the flow channel structure (1214).

30. The one-way valve according to claim 28, characterized in that The valve core (121) comprises a first valve core section (1215), a second valve core section (1216) and a third valve core section (1217), wherein the second valve core section (1216) is connected between the first valve core section (1215) and the third valve core section (1217); The second valve core segments include at least two and are arranged at intervals along the circumference of the valve core (121).

31. The one-way valve according to any one of claims 1 to 13, characterized in that: The one-way valve further comprises a sealing ring (1d), wherein the sealing ring (1d) is sleeved outside the valve core (121), and the sealing ring (1d) is configured to be able to seal with an end of the liquid injection hole (111) facing away from the sealing portion (1222) at least when the sealing portion (1222) is separated from the end cover (11).

32. The one-way valve according to claim 31, characterized in that The two ends of the sealing ring (1d) along the axis (12c) of the valve core (121) include a first end (12f) and a second end (12g), the first end (12f) abuts against the valve core (121), and the second end (12g) is used to abut against an end of the injection hole (111) facing away from the sealing portion (1222), and the wall thickness h of the sealing ring (1d) tends to decrease from the first end (12f) to the second end (12g).

33. The one-way valve according to claim 31, characterized in that The sealing ring (1d) includes a first channel (12h) and a second channel (12i) which are distributed along the axis (12c) of the valve core (121) and are sleeved outside the valve core (121); the second channel (12i) is closer to the sealing portion (1222) than the first channel (12h); and there is a spacing (12j) between the inner wall of the second channel (12i) and the side surface of the valve core (121).

34. The one-way valve according to claim 33, characterized in that The distance (12j) between the inner wall of the second channel (12i) and the side surface of the valve core (121) gradually increases from an end of the second channel (12i) close to the first channel (12h) to an end of the second channel (12i) far from the first channel (12h).

35. The one-way valve according to any one of claims 1 to 13, characterized in that: 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).

36. A valve body, used for being assembled in a liquid injection hole (111) of an end cover (11), characterized in that: include: A sealing portion (1222), the sealing portion (1222) being used for sealingly cooperating with the liquid injection hole (111), the sealing portion (1222) being used for defining a portion located at the liquid injection hole (111) to form a flow passage for communicating with the outside; The sealing portion (1222) is configured to deform under the action of an external force and separate from the end cover (11) to form a flow port, and the flow port is connected to the flow channel.

37. The valve body according to claim 36, characterized in that A deformation recess (1c) is recessed in one side surface of the sealing portion (1222), and a portion of the sealing portion (1222) located on the outer periphery of the deformation recess (1c) is used to abut against the abutment member (1a) of the end cover (11).

38. The valve body according to claim 36, characterized in that The sealing portion (1222) comprises 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 sealingly cooperating with the liquid injection hole (111).

39. The valve body according to claim 38, characterized in that A first guide surface (1c7) is circumferentially provided at one end of the connecting section (12221) away from the sealing section (12222), and an area A1 of a cross section of the first guide surface (1c7) gradually decreases in a direction away from the sealing section (12222).

40. The valve body according to claim 38, characterized in that The sealing portion (1222) further comprises a fixing portion (1221), wherein the fixing portion (1221) is arranged around the outer periphery of the connecting section (12221) and is spaced apart from the sealing section (12222), and the fixing portion (1221) is used for sealingly cooperating with the liquid injection hole (111).

41. The valve body according to claim 40, characterized in that The fixing portion (1221), the connecting section (12221) and the sealing section (12222) are enclosed to form a bayonet (123), and the bayonet (123) is used to clamp the hole wall of the liquid injection hole (111).

42. The valve body according to claim 40, characterized in that A flow guide hole (124) is provided on the fixing portion (1221), a connecting groove (12n) connected to the flow guide hole (124) is provided on the surface of the connecting section (12221), and the flow guide hole (124) and the connecting groove (12n) together form the flow passage.

43. The valve body according to claim 42, characterized in that The guide hole (124) comprises at least two sub-holes (12p), each of the sub-holes (12p) is arranged at intervals along the circumference of the fixing portion (1221), and all of the sub-holes (12p) are connected to the connecting groove (12n).

44. The valve body according to claim 40, characterized in that The valve body has a valve closing position and a valve opening position. When the valve body is located at the valve closing position, the fixing portion (1221) and the sealing section (12222) are both in sealing cooperation with the hole wall of the liquid injection hole (111); When the valve body is located at the valve opening position, the fixing portion (1221) is in sealing cooperation with the hole wall of the liquid injection hole (111), and the sealing section (12222) is separated from the hole wall of the liquid injection hole (111) to form the flow port.

45. The valve body according to claim 40, characterized in that The sealing section (12222) comprises a first surface (125) and a second surface (126) which are sequentially arranged along a preset direction (T); the first surface (125) is connected to the connecting section (12221) and is parallel to the preset direction (T); one end of the second surface (126) is connected to the first surface (125), and the other end is inclined toward a direction close to the hole wall of the injection hole (111); The first surface (125) is used for interference fit with the hole wall of the injection hole (111), the second surface (126) is used for abutting against the hole wall of the injection hole (111), and the preset direction (T) is configured as the direction in which the valve body is inserted into the injection hole (111).

46. ​​The valve body according to any one of claims 36 to 45, characterized in that A valve cavity (1225) is provided in the valve body (122), and the valve cavity (1225) is used to accommodate a force-applying member for providing an external force.

47. The valve body according to claim 46, characterized in that The valve body (122) is provided with a valve port (1223) and a flow guide port (1224) both of which are in communication with the valve cavity (1225); the valve port (1223) is used for the force-applying member to be inserted into the valve cavity (1225).

48. The valve body according to claim 46, characterized in that The valve cavity (1225) comprises a first cavity (127) and a second cavity (128) which are interconnected, wherein the first cavity (127) is arranged on one side of the valve port (1223) of the valve cavity (1225), and the second cavity (128) is arranged on one side of the cavity bottom wall of the valve cavity (1225); Wherein, the diameter of the first cavity (127) is smaller than the diameter of the second cavity (128).

49. An end cap assembly, characterized in that: The end cap assembly comprises: The end cover (11) is provided with a liquid injection hole (111) extending through the end cover along its thickness direction (X); According to any one of claims 1 to 35, the valve body (122) is assembled in the liquid injection hole (111).

50. An end cap assembly, characterized in that: The end cap assembly comprises: The end cover (11) is provided with a liquid injection hole (111) extending through the end cover along its thickness direction (X); The valve body according to any one of claims 36 to 48, wherein the valve body (122) is assembled in the liquid injection hole (111).

51. The end cap assembly according to claim 49 or 50, characterized in that 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).

52. A battery cell, characterized in that: The battery cell comprises the end cap assembly according to any one of claims 49-51.

53. A method for preparing a battery monomer, characterized in that: The method comprises the following steps: Assembling the valve body (122) in the liquid injection hole (111) from one side of the end cover (11) along its thickness direction (X), and making the valve body (122) at least partially sealably fit with the hole wall of the liquid injection hole (111); Inserting the valve core (121) into the injection hole (111) from the other side of the end cover (11) along its thickness direction (X), and matching it with the valve body (122); The end cover (11) is sealed on the housing (20) of the battery cell; The valve core (121) is pressed to cause the valve body (122) to deform and separate from the end cover (11), thereby completing the exhaust and / or liquid injection operations.

54. The method for preparing a battery monomer according to claim 53, characterized in that: The method further comprises the steps of: After the injection operation is completed, the valve core (121) is removed from the end cover (11); The buckle protrusion (1c4) of the valve body (122) located in the liquid injection hole (111) is cut off, and the end of the liquid injection hole (111) facing away from the housing (20) is sealed.

55. A battery, characterized in that: Comprising the battery cell as claimed in claim 52 above.

56. An electrical device, characterized in that: The invention comprises a battery as claimed in claim 55, wherein the battery is used to provide electrical energy to the electrical device.

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