WO2025031401A1 - Soupape unidirectionnelle, ensemble couvercle d'extrémité, élément de batterie, batterie et dispositif électrique - Google Patents

Soupape unidirectionnelle, ensemble couvercle d'extrémité, élément de batterie, batterie et dispositif électrique Download PDF

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Publication number
WO2025031401A1
WO2025031401A1 PCT/CN2024/110410 CN2024110410W WO2025031401A1 WO 2025031401 A1 WO2025031401 A1 WO 2025031401A1 CN 2024110410 W CN2024110410 W CN 2024110410W WO 2025031401 A1 WO2025031401 A1 WO 2025031401A1
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WO
WIPO (PCT)
Prior art keywords
valve core
valve
sealing
end cover
flow
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/CN2024/110410
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English (en)
Chinese (zh)
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WO2025031401A9 (fr
Inventor
阮广辉
黄彩虾
葛少兵
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Contemporary Amperex Technology Co Ltd
Original Assignee
Contemporary Amperex Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Contemporary Amperex Technology Co Ltd filed Critical Contemporary Amperex Technology Co Ltd
Publication of WO2025031401A1 publication Critical patent/WO2025031401A1/fr
Publication of WO2025031401A9 publication Critical patent/WO2025031401A9/fr
Anticipated expiration legal-status Critical
Pending legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/60—Arrangements or processes for filling or topping-up with liquids; Arrangements or processes for draining liquids from casings
    • H01M50/609—Arrangements or processes for filling with liquid, e.g. electrolytes
    • H01M50/627—Filling ports
    • H01M50/636—Closing or sealing filling ports, e.g. using lids

Definitions

  • the present application relates to the field of battery technology, and in particular to a one-way valve, an end cover assembly, a battery cell, a battery and an electrical device.
  • 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.
  • the present application provides a one-way valve for sealing or opening the injection hole of an end cover, the one-way valve comprising: a valve core; a valve body for being assembled in the injection hole, and comprising a sealing portion, the sealing portion being used to seal and cooperate with the injection hole, the valve core being at least partially fitted within the valve body and defining with the valve body a flow channel for communicating with the outside; wherein the valve core is configured to drive the sealing portion to deform under the action of an external force and separate from the end cover to form a flow port, the flow port being connected to the flow channel.
  • the sealing part and the injection hole seal and block the flow channel and the internal environment of the battery cell.
  • 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.
  • the sealing part separates from the end cover and forms a flow port, which is connected to the flow channel.
  • 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.
  • 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.
  • 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.
  • 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.
  • the abutment covers the sealing portion, and part of the inner wall of the abutment abuts against the sealing portion.
  • the edge portion covers the sealing portion, which facilitates better pressing of the sealing portion onto the end cap to achieve more effective sealing.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • a first through hole is formed through the abutment member, and the medium outflow direction in the first through hole is aligned with the axial direction of the valve core.
  • 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 member, so that the exhaust or injection operation can be carried out more smoothly; at the same time, the outflow direction of the medium in the first through hole intersects with the valve core, which alleviates the impact on the electrode assembly during the injection process.
  • the one-way valve further includes an insulating cover, which is disposed on the abutment.
  • 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.
  • 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.
  • 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.
  • connection section and the valve core are detachably connected.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the valve core is provided with a flow cavity, which extends along the axial direction of the valve core to the surface leading to the sealing portion, and the flow cavity and the surface of the sealing portion define a flow channel.
  • the flow cavity is introduced to facilitate the electrolyte to flow to the sealing portion more easily during the injection process, making the injection operation more convenient.
  • 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.
  • 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 a radial direction of the valve core, and the flow chamber is provided in the valve core body and/or the extrusion portion.
  • 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.
  • 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.
  • a valve cavity is formed in the valve body, and a valve port and a flow guide port both connected to the valve cavity are formed on the valve body.
  • the valve port, the flow cavity and the flow guide port are connected in sequence to form a flow channel.
  • 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.
  • 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.
  • the valve core 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.
  • a valve core cavity is opened in the valve core, and a flow channel opening and a valve core opening which are both connected to the valve core cavity are opened on the valve core; the valve core opening, the valve core cavity and the flow channel opening are connected in sequence and constructed to form a flow channel structure.
  • 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, which are intersectingly arranged in the valve core cavity and divide the valve core cavity into multiple valve core sub-cavities, and the valve core port is connected to the valve core sub-cavity to form a flow channel structure.
  • the valve core includes a first valve core segment, a second valve core segment and a third valve core segment, the second valve core segment is connected between the first valve core segment and the third valve core segment; the second valve core segment includes at least two and is spaced apart along the circumference of the valve core.
  • the one-way valve further comprises a sealing ring, which is sleeved outside the valve core and configured to seal with an end of the injection hole facing away from the sealing portion when the sealing portion is separated from the end cover.
  • the valve body further includes a fixing portion, the fixing portion is used to be connected to the end cover, and the sealing portion is connected to the fixing portion and is sealed with the end cover.
  • a bayonet is formed between the fixing portion and the sealing portion, and the bayonet is used to snap into the hole wall of the liquid injection hole.
  • the flow passage includes a plurality of flow passages, all of which are arranged at intervals around the outer circumference of the valve core and are all connected to the flow port.
  • an end cover assembly which includes: an end cover having an injection hole extending through the end cover along its thickness direction; and a one-way valve such as any of the above, wherein the valve body is assembled in the injection hole.
  • 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.
  • the present application provides an end cover assembly, comprising: an end cover having an injection hole extending therethrough along the thickness direction thereof; a valve body assembled in the injection hole and comprising a sealing portion, the sealing portion being used to seal with the injection hole, the valve body being used to define a flow channel for communicating with the outside with the valve core; wherein the sealing portion is configured to deform under the action of an external force and separate from the end cover to form a flow port, the flow port being connected with the flow channel.
  • the present application provides a battery cell, the battery cell comprising any one of the above end cover assemblies.
  • the present application provides a battery comprising the above battery cells.
  • the present application provides an electrical device, comprising the above battery, and the battery is used to provide electrical energy to the electrical device.
  • FIG1 is a schematic diagram of the structure of a vehicle in some embodiments of the present application.
  • FIG. 2 is an exploded view of a battery in some embodiments of the present application.
  • FIG. 3 is a schematic diagram of the structure of a battery cell in some embodiments of the present application.
  • FIG. 4 is a schematic structural diagram of an end cover assembly in the first embodiment of the present application.
  • FIG. 5 is a structural cross-sectional view of the end cover assembly shown in FIG. 4 .
  • FIG. 6 is a schematic diagram of an exploded structure of the end cover assembly shown in FIG. 4 .
  • FIG. 7 is a schematic structural diagram of an end cover assembly in the second embodiment of the present application.
  • FIG. 8 is a structural cross-sectional view of the end cover assembly shown in FIG. 7 .
  • FIG. 9 is a schematic structural diagram of an end cover assembly in the third embodiment of the present application.
  • FIG. 10 is a structural cross-sectional view of the end cap assembly shown in FIG. 9 .
  • FIG. 11 is a schematic diagram of an exploded view of the structure of the end cover assembly shown in FIG. 7 .
  • FIG. 12 is a schematic diagram of an exploded view of the structure of the end cover assembly shown in FIG. 9 .
  • FIG. 13 is a schematic structural diagram of an end cover assembly in the fourth embodiment of the present application.
  • FIG. 14 is a schematic structural diagram of an end cover assembly in the fifth embodiment of the present application.
  • Fig. 15 is a cross-sectional view of the end cover assembly shown in Fig. 13 along the A-A direction.
  • Fig. 16 is a cross-sectional view of the end cover assembly shown in Fig. 14 along the B-B direction.
  • FIG. 17 is a schematic diagram of the structure of a one-way valve in an end cover assembly in a sixth embodiment of the present application.
  • Fig. 18 is a cross-sectional view of the one-way valve shown in Fig. 17 along the C-C direction.
  • FIG. 19 is a top view of the one-way valve shown in FIG. 17 .
  • FIG. 20 is a schematic structural diagram of the one-way valve in the end cover assembly shown in FIG. 13 .
  • FIG. 21 is an exploded view of the one-way valve shown in FIG. 20 .
  • FIG. 22 is a schematic diagram of the structure of the valve core in the one-way valve shown in FIG. 21 .
  • FIG. 23 is an exploded view of the one-way valve in the end cover assembly shown in FIG. 14 .
  • FIG. 24 is a schematic structural diagram of the one-way valve shown in FIG. 23 .
  • valve core 1211, valve core port; 1212, flow channel port; 1213, valve core cavity; 1213a, valve core sub-cavity; 1214, flow channel structure; 1215, first valve core section; 1216, second valve core section; 1217, third valve core section; 1218, valve core body; 1219, valve core branch; 12a, extrusion section; 12b, extrusion groove; 12c, axis; 122, valve body; 1221, fixing section; 12211, first sealing area; 12212, second sealing area; 1222, sealing part; 12221, connecting section; 12222, sealing section; 1223, valve port; 1224, flow guide port; 1225, valve cavity; 1226, flow cavity; 1227
  • 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.
  • 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.
  • the battery cell 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.
  • 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 vacuuming takes a long time, which greatly prolongs the time the battery cell stays in the injection station, and the injection efficiency is reduced.
  • 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.
  • 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.
  • 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.
  • 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.
  • FIG. 1 is a schematic diagram of the structure of a vehicle 10000 in some embodiments of the present application.
  • the embodiment of the present application provides an electric device using a battery 1000 as a power source
  • 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.
  • 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.
  • the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.
  • 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 a
  • the vehicle 10000 is provided with a battery 1000 inside, and the battery 1000 can be arranged at the bottom, head or tail of the vehicle 10000.
  • the battery 1000 can be used to power the vehicle 10000, for example, the battery 1000 can be used as an operating power source for the vehicle 10000.
  • the vehicle 10000 may also include a controller 2000 and a motor 3000, and the controller 2000 is used to control the battery 1000 to power the motor 3000, for example, for starting, navigating and driving the vehicle 10000.
  • 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.
  • FIG. 2 is an exploded view of a battery 1000 in some embodiments of the present application.
  • 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.
  • 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.
  • 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.
  • 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 1000 module formed by connecting multiple battery cells 100 in series, in parallel, or in a mixed connection, and then the multiple battery 1000 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the end cap 11 and the shell 20 can also be integrated.
  • 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. In some examples, 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.
  • 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.
  • the shape of the end cap 11 can be adapted to the shape of the shell 20 to match the shell 20.
  • 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.
  • 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.
  • 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 insulating member can be separated from the electrical connection components in the housing 20 and the end cap 11 to reduce the risk of short circuit.
  • the present application provides a one-way valve 12 for sealing or opening the injection hole 111 of the end cover 11, and 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 at least partially matched in the valve body 122 and defines a flow channel for communicating with the outside with the valve body 122.
  • the valve core 121 is configured to drive the sealing portion 1222 to deform under the action of an external force and separate from the end cover 11 to form a flow port, and the flow port is connected to the flow channel.
  • 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.
  • 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.
  • valve body 122 and the valve core 121 can be formed separately or integrally.
  • 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; taking Figures 9 and 10 as examples, the valve body 122 and the valve core 121 are integrally formed.
  • a flow passage is defined between the valve core 121 and the valve body 122.
  • the structure of the flow passage can be designed in a variety of ways, for example: the valve core 121 and the valve body 122 each have a recessed structure on their outer surfaces to form a flow passage; a recessed structure can also be provided on the outer surface of the valve core 121, and the recessed structure and the outer surface of the valve body 122 form a flow passage; of course, 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.
  • 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.
  • 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.
  • 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.
  • a flow outlet is formed when the sealing portion 1222 is separated from the inner end surface 112 of the end cover 11.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the battery cell 100 is transported to the liquid injection station for liquid injection.
  • the flow passage in the one-way valve 12 is always separated from the internal environment of the battery cell 100, there is still a high vacuum degree in the battery cell 100. Therefore, when the battery 1000 is transported to the injection station, it is not necessary to evacuate the battery cell 100.
  • 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.
  • the electrolyte flowing out of the injection nozzle flows into the battery cell 100 through the flow channel and the flow port in sequence.
  • the injection nozzle is removed.
  • 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.
  • 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.
  • the sealing portion 1222 seals with the end cover 11 and blocks the flow channel from the internal environment of the battery cell 100.
  • 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.
  • the sealing portion 1222 separates from the end cover 11 and forms a flow port, which is connected to the flow channel.
  • 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.
  • 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 .
  • the one-way valve 12 further includes an abutment 1a, which is used to be arranged on the end cover 11 and 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.
  • 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.
  • the abutment 1a 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.
  • 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.
  • the material of the abutment 1a 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.
  • 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.
  • the abutment 1a can be designed as an L-shaped structure.
  • the abutment 1a can also cover the sealing portion 1222, so that the sealing portion 1222 is pressed against the end cover 11.
  • 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.
  • 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.
  • 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.
  • the abutting member 1 a covers the sealing portion 1222 , and a portion of the inner wall of the abutting member 1 a abuts against the sealing portion 1222 .
  • 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.
  • 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.
  • a certain gap may be left between the abutment member 1a and the sealing portion 1222. or, a hole is opened on the abutment member 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 member 1a.
  • 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.
  • a deformation recess 1c is formed in 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 abutment 1a .
  • 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.
  • the contact protrusion 1c1 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.
  • 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.
  • 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.
  • a first through hole 1 a 4 is formed through the abutment member 1 a , and the first through hole 1 a 4 is configured to allow the sealing portion 1222 to deform at least partially along a side away from the valve core 121 .
  • the sealing portion 1222 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.
  • 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.
  • 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.
  • the first through hole 1a4 is provided on the abutment 1a, which can also facilitate the medium to pass through the abutment 1a.
  • 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.
  • 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.
  • the formed projection may also be smaller than the size of the first through hole 1a4.
  • 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 the related accessories of the one-way valve 10, 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 10 structure with different battery cells 100.
  • 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.
  • 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.
  • 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.
  • 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.
  • the first through hole 1a4 may be provided on the cover portion 1a1.
  • 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 .
  • a first through hole 1 a 5 is formed through the abutment member 1 a , and a medium outflow direction in the first through hole 1 a 5 intersects with an axis 12 c of the valve core 121 .
  • 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.
  • 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, all the first through holes 1a5 are arranged at intervals along the circumference of the abutment member 1a, referring to FIG6. Meanwhile, when the abutment member 1a can include a cover portion 1a1 and an edge portion 1a2 arranged on the outer edge of the cover portion 1a1, the first through hole 1a5 can be arranged on the edge portion 1a2 or on the cover portion 1a1.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the one-way valve 12 further includes an insulating cover 1 b , and the insulating cover 1 b is disposed on the abutting member 1 a .
  • the insulating cover 1b refers to a structure that covers the outside of the abutment 1a to achieve insulation protection for the abutment 1a.
  • the material of the insulating cover 1b such as but not limited to plastic, rubber, etc.
  • 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.
  • the insulating cover 1b on the end cover 11 such as but not limited to snap-on, pin-on, adhesive, etc.
  • the insulating cover 1b covers the abutment 1a; if the abutment 1a covers the sealing portion 1222, the insulating cover 1b can cover the abutment 1a and the outside of the sealing portion 1222 at the same time.
  • 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.
  • the second through hole 1b2 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 reduce the direct impact of the electrode assembly 30 during injection.
  • 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 .
  • 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.
  • 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 such as: 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.
  • the unpressed portion of the sealing segment 12222 can be separated from the inner end face 112 under the action of an external force to form a flow port.
  • the edge of the sealing segment 12222 has a structure extending radially outward, and the abutment member 1a presses the radially outward extending structure onto the inner end face 112, so that a portion of the sealing segment 12222 can be separated from the inner end face 112 under the action of an external force.
  • the portion of the sealing segment 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.
  • 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.
  • 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.
  • FIG. 5 and FIG. 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.
  • 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.
  • FIG. 1 please refer to FIG.
  • the sealing section 12222 is at least partially located in the injection hole 111 and abuts against the hole wall or the hole edge at one end of the injection hole 111 to achieve a sealed fit.
  • 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.
  • 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.
  • the connection section 12221 and the valve core 121 can also be designed as an integrated structure.
  • 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.
  • the connecting section 12221 recovers its deformation, and the sealing portion 1222 is sealed with the end cover 11 again.
  • the connecting section 12221 and the valve core 121 are an integrated structure.
  • 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.
  • 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.
  • 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. Then, 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 and forms a flow port.
  • 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.
  • the sealing portion 1222 restores its deformation, and the sealing portion 1222 is sealed with the end cover 11 again.
  • 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.
  • the connecting section 12221 and the valve core 121 are detachably connected.
  • 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.
  • detach the valve core 121 and the connecting section 12221 such as plug-in, clamping, threaded connection, etc.
  • 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 .
  • 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.
  • 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.
  • 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.
  • the circumferential portion of the sealing segment 12222 radially protrudes outside the connecting segment 12221 .
  • the circumferential portion of the sealing section 12222 is used to abut against the end cover 11
  • the connecting section 12221 is used to seal and fit against the hole wall of the injection hole 111 .
  • 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.
  • the circumferential portion is located outside the injection hole 111 and abuts against the inner end surface 112 of the end cover 11.
  • 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.
  • 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.
  • 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.
  • connection section 12221 facilitates the connection section 12221 to fit closely on the hole wall of the injection hole 111, thereby improving the sealing effect.
  • 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 .
  • 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.
  • 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.
  • 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.
  • valve core 121 is provided with a flow chamber 1226, the flow chamber 1226 extends along the axis 12c direction of the valve core 121 to the surface leading to the sealing part 1222, and the flow chamber 1226 and the surface of the sealing part 1222 define a flow channel.
  • 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 channel.
  • the flow chamber 1226 extends along the axis 12c of the valve core 121 to the surface leading to the sealing portion 1222, which means that the flow channel can be composed of the flow 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.
  • 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.
  • 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.
  • a communication port communicating with the flow cavity 1226 is also required to be provided on the valve core 121, and the communication port leads to the surface of the sealing portion 1222.
  • the communication port can be disposed on the side of the hole wall of the valve core 121 facing the injection hole 111, or on the bottom surface of the valve core 121 facing the sealing portion 1222.
  • Such a design introduces the flow cavity 1226, so that the electrolyte can flow to the sealing portion 1222 more easily during the injection process, making the injection operation more convenient.
  • the flow chamber 1226 is disposed on the side of the valve core 121 around its own axis 12 c; and/or, the flow chamber 1226 is disposed inside the valve core 121 .
  • 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 at least partially fitted 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 arranged inside the valve core 121, it is necessary to open a communication port on the valve core 121 to communicate with the flow chamber 1226, and the communication port leads to the surface of the sealing part 1222.
  • 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.
  • the distribution position of the flow chamber 1226 is reasonably set, so that the exhaust or liquid injection operation can be carried out stably.
  • the valve core 121 includes a valve core body 1218 and a valve core body 1218 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.
  • 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.
  • 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.
  • the circumferential edges of the extrusion portion 12a all protrude out of the valve core body 1218 in the radial direction.
  • 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.
  • 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.
  • an extrusion groove 12b connected to the flow chamber 1226 is provided on an 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 an end of the extrusion groove 12b away from the valve core body 1218 to an end of the extrusion groove 12b close to the valve core body 1218.
  • 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.
  • the cross section of the extrusion groove 12b is the cross section indicated by S in Figure 5.
  • the electrolyte can be more easily collected in the flow chamber 1226, reducing the residual electrolyte.
  • 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.
  • 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.
  • 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.
  • the valve cavity 1225 refers to the space structure inside the valve body 122.
  • 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.
  • valve core 121 may be partially located in the valve cavity 1225, and the rest of the valve core 121 may extend out of the valve port 1223, or the valve core 121 may be completely located in the valve cavity 1225.
  • 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.
  • 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.
  • 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.
  • the sealing portion 1222 includes a connecting section 12221 and a sealing section 12222.
  • the connecting section 12221 may be a continuous annular structure, on which one or a plurality of guide ports 1224 are provided at intervals along the circumference of the valve body 122.
  • the connecting section 12221 is multiple and is provided at intervals along the circumference of the valve body 122, and a guide port 1224 is defined between each two adjacent connecting sections 12221.
  • Each connecting section 12221 may extend along the thickness direction X of the end cover 11 or extend along the radial direction of the injection hole 111.
  • the number of the guide ports 1224 may be one or more, and may be specifically set according to needs.
  • valve port 1223, the flow chamber 1226 and the flow guide port 1224 are sequentially connected to form a flow passage.
  • the one-way valve 12 has only one flow passage.
  • the flow chamber 1226 is not divided to form a flow sub-chamber 1227, and there are multiple flow guide ports 1224, which are spaced along the circumference of the valve body 122. Taking the partition setting as an example, the valve port 1223, the flow chamber 1226 and each guide port 1224 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 share the valve port 1223 and the flow chamber 1226.
  • valve port 1223, each flow sub-chamber 1227 and the flow guide port 1224 are connected in sequence to form a flow passage.
  • 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.
  • 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.
  • the one-way valve 12 has multiple flow channels, and all the flow channels only share the valve port 1223.
  • valve port 1223, the flow chamber 1226 and the flow guide port 1224 are always connected to form a flow passage.
  • 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.
  • a valve cavity 1225 is opened in the valve body 122, and a valve port 1223 and a guide port 1224 which are both connected to the valve cavity 1225 are opened on the valve body 122; the valve core 121 is at least partially installed in the valve cavity 1225, and a flow channel structure 1214 is provided in the valve core 121, and a flow channel is formed when the flow channel structure 1214 is connected with the guide port 1224.
  • the flow channel structure 1214 refers to a structure that allows the medium to flow inside the valve core 121.
  • the flow channel structure 1214 in the valve core 121 can be one or more, and the guide port 1224 on the valve body 122 can be one or more. Taking the case where there is one flow channel structure 1214 in the valve core 121 and one guide port 1224 on the valve body 122 as an example, a flow passage is formed when the flow channel structure 1214 is connected with the guide port 1224. In this embodiment, there is only one flow passage in the one-way valve 12.
  • 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.
  • the one-way valve 12 has multiple flow passages, and all the flow passages share the same flow passage structure 1214.
  • the flow guide port 1224 on the valve body 122 is continuously arranged along the circumference of the connecting section 12221 as an example, all the flow passage structures 1214 are arranged at intervals along the circumference of the valve core 121, and each flow passage structure 1214 forms a flow passage when connected to the same flow guide port 1224.
  • the one-way valve 12 has multiple flow passages, and all the flow passages share the same flow guide port 1224.
  • 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.
  • valve core 121 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.
  • the valve core 121 sinks and drives the sealing section 12222 to separate from the end cover 11 to form a flow port.
  • 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.
  • 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.
  • 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 form a flow channel structure 1214.
  • 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.
  • the valve core 121 includes a first valve core section 1215, a second valve core section 1216 and a third valve core section 1217, and the first valve core section 1215, the second valve core section 1216 and the third valve core section 1217 are sequentially arranged along the thickness direction X of the end cover 11, and the second valve core section 1216 is connected between the first valve core section 1215 and the third valve core section 1217.
  • the first valve core section 1215 is annular, and the valve core port 1211 is opened on the end surface of one end of the first valve core section 1215 away from the third valve core section 1217.
  • the first valve core segment 1215, the second valve core segment 1216 and the third valve core segment 1217 are arranged to form a valve core cavity 1213, and the guide port 1224 is defined by the second valve core segment 1216.
  • the second valve core segment 1216 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.
  • the second valve core segment 1216 is a plurality of second valve core segments 1216 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 segments 1216.
  • Each second valve core segment 1216 extends along the thickness direction X of the end cover 11.
  • 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 valve body 122 and the valve core 121.
  • the structure reduces the manufacturing cost of the one-way valve 12.
  • the valve core 121 includes a first valve core section 1215, a second valve core section 1216 and a third valve core section 1217, and the second valve core section 1216 is connected between the first valve core section 1215 and the third valve core section 1217;
  • the second valve core section 1216 includes at least two, which are intersectingly arranged in the valve core cavity 1213 and divide the valve core cavity 1213 into multiple valve core sub-cavities 1213a, and the valve core port 1211 is connected to the valve core sub-cavity 1213a to form a flow channel structure 1214.
  • each flow channel structure 1214 shares a valve port 1223 of the valve body 122 .
  • valve core cavity 1213 is divided into a plurality of valve core sub-cavities 1213 a by designing the second valve core segment 1216 , is simple and easy to operate, and facilitates the molding of the flow channel structure 1214 .
  • the valve core 121 includes a first valve core segment 1215, a second valve core segment 1216 and a third valve core segment 1217, and the second valve core segment 1216 is connected between the first valve core segment 1215 and the third valve core segment 1217; the second valve core segment 1216 includes at least two and is arranged at intervals along the circumference of the valve core 121.
  • the second valve core section 1216 extends along the thickness direction X of the end cover 11, and a guide port 1224 is formed between each two adjacent second valve core sections 1216.
  • 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.
  • This design facilitates simplifying the structure of the valve core 121 and reducing the manufacturing cost of the one-way valve 12 .
  • the one-way valve 12 further includes a sealing ring 123, which is sleeved on the outside of the valve core 121, and the sealing ring 123 is configured to seal with one end of the injection hole 111 facing away from the sealing portion 1222 when the sealing portion 1222 is separated from the end cover 11.
  • the sealing ring 123 is capable of sealingly cooperating with one end of the liquid injection hole 111 when the liquid injection hole 111 is opened, so that the end of the liquid injection hole 111 close to the sealing portion 1222 is opened, and the end away from the sealing portion 1222 is then sealed by the sealing ring 123, which can reduce the probability of leakage during liquid injection or formation and exhaust, thereby reducing the risk of contamination of the battery 1000.
  • the sealing ring 123 can be made of a variety of materials, such as but not limited to rubber, plastic, etc.
  • 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 123 is sleeved on the valve core body 1218 and is disposed on one side of the extrusion portion 12a facing the sealing portion 1222.
  • 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.
  • the valve body 122 further includes a fixing portion 1221 , where 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 .
  • the fixing portion 1221 refers to a structure connected 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. Please refer to Figures 15 to 17.
  • the fixing portion 1221 is fixed to the end cover 11. Regardless of whether an external force acts on the valve core 121, the fixing portion 1221 always remains in a position relative to the end cover 11.
  • the fixing portion 1221 can be located in the injection hole 111 and clamped with the hole wall of the injection hole 111; or, the fixing portion 1221 can also be located on the side of the end cover 11 facing away from the inside of the shell 20 and abut against the outer end surface 113 of the end cover 11.
  • 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.
  • the battery cell 100 is always sealed with the end cover 11, and the sealing section 12222 is selectively sealed or disconnected from the end cover 11.
  • the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the valve core 121 and the fixing portion 1221 can also be sealed or spaced apart.
  • the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the valve core 121 and the fixing portion 1221 are also sealed together.
  • the fixing portion 1221 and the sealing section 12222 are both sealed with the end cover 11, the valve core 121 and the fixing portion 1221 are spaced apart.
  • the sealing portion 1222 includes a sealing section 12222 and a connecting section 12221.
  • the fixing portion 1221 and the end cover 11 may 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.
  • the sealing section 12222 and the end cover 11 may be sealed by means of bevel sealing and/or plane sealing.
  • 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
  • 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.
  • the surface of the fixed 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.
  • the sealing method of the fixed portion 1221 and the end cover 11 in FIG. 17 is the same as the sealing method of the fixed portion 1221 and the end cover 11 in FIG. 16, so it is not repeated here.
  • the sealing section 12222 is sealed with the inclined surface of the hole wall of the injection hole 111.
  • 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.
  • the connecting section 12221 resumes its deformation, and the sealing section 12222 is sealed with the inclined surface of the hole wall of the injection hole 111 again.
  • the sealing portion 1222 and the fixing portion 1221 are both elastic structures and are integrally arranged.
  • 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.
  • 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.
  • a bayonet 123 is formed between the fixing portion 1221 and the sealing portion 1222 , and the bayonet 123 is used to be inserted into the hole wall of the liquid injection hole 111 .
  • 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.
  • 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 .
  • 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.
  • each flow channel can be set independently of each other, or there can be some overlap, which is not specifically limited here.
  • the battery cell 100 can be quickly vented or filled with liquid, and the production efficiency is further improved.
  • the present application provides an end cover assembly 10, the end cover assembly 10 includes: an end cover 11, which is provided with an injection hole 111 along its own thickness direction X; a one-way valve 12 such as any of the above items, and the valve body 122 is assembled in the injection hole 111.
  • 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.
  • a sealing protrusion 114 is convexly provided on the end cover 11 , and 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 .
  • the sealing protrusion 114 refers to an annular structure extending around the outer periphery of 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.
  • 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.
  • the sealing protrusion 114 can also be sealed and fitted with the sealing portion 1222 to further improve the sealing performance.
  • 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.
  • an end cap assembly 10 is provided.
  • the end cap assembly 10 includes: an end cap 11 having a liquid injection hole 111 extending through the end cap 11 along its thickness direction X; a valve body 122 assembled in the liquid injection hole 111 and including a sealing portion 1222. 1222 is used for sealing cooperation with the injection hole 111, and the valve body 122 is used for defining a flow channel for communicating with the outside between the valve core 121; wherein the sealing portion 1222 is configured to deform under the action of external force and separate from the end cover 11 to form a flow port, and the flow port is connected to the flow channel.
  • 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.
  • 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.
  • 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.
  • a flow outlet is formed when the sealing portion 1222 is separated from the inner end surface 112 of the end cover 11.
  • 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.
  • the sealing portion 1222 is deformed by external force, and is separated from the end cover 11 to form a flow port.
  • there are many ways to act on the sealing portion 1222 such as: using the valve core 121 in any of the above embodiments, 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.
  • 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.
  • the present application provides a battery cell 100 , and the battery cell 100 includes any one of the above end cover assemblies 10 .
  • the present application provides a battery 1000 including the above battery cell 100 .
  • 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.
  • 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 to separate from the end cover 11 to form a flow port, and the flow port is connected to the flow channel.
  • the sealing portion 1222 seals with the end cover 11 and blocks the flow channel and the internal environment of the battery cell 100.
  • 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.
  • the sealing portion 1222 separates from the end cover 11 and forms a flow port, which is connected to the flow channel.
  • 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.
  • 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 .

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Filling, Topping-Up Batteries (AREA)
  • Gas Exhaust Devices For Batteries (AREA)

Abstract

La présente invention concerne une soupape unidirectionnelle, un ensemble couvercle d'extrémité, un élément de batterie, une batterie et un dispositif électrique. Lorsqu'un noyau de soupape n'est pas soumis à une force externe, une partie d'étanchéité est en ajustement étanche avec un trou d'injection de liquide et bloque un canal de passage d'écoulement et l'environnement interne d'un élément de batterie. Ainsi, un échange de milieu ne peut pas être effectué entre l'extérieur et l'environnement interne de l'élément de batterie, l'échappement de gaz ou l'injection de liquide ne peuvent également pas être réalisés, l'environnement interne de l'élément de batterie est moins influencé par l'environnement externe, l'effet d'étanchéité à l'eau est bon, de telle sorte que l'élément de batterie n'a pas besoin d'être mis sous vide pendant l'injection de liquide ultérieure, et l'efficacité d'injection de liquide est élevée. Lorsque le noyau de soupape est soumis à une force externe, la partie d'étanchéité est séparée d'un couvercle d'extrémité pour former un orifice de passage d'écoulement, et l'orifice de passage d'écoulement est en communication avec le canal de passage d'écoulement. Par conséquent, la vapeur formée par évaporation de l'eau dans un ensemble électrode peut être évacuée vers l'extérieur à travers l'orifice de passage d'écoulement et le canal de passage d'écoulement vers le gaz d'échappement.
PCT/CN2024/110410 2023-08-07 2024-08-07 Soupape unidirectionnelle, ensemble couvercle d'extrémité, élément de batterie, batterie et dispositif électrique Pending WO2025031401A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN202322110478.7 2023-08-07
CN202322110478 2023-08-07
CN202410370920.6 2024-03-28
CN202410370920 2024-03-28

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Publication number Priority date Publication date Assignee Title
CN203013829U (zh) * 2012-09-27 2013-06-19 惠州比亚迪电池有限公司 一种锂离子电池封口阀及锂离子电池
JP2014179288A (ja) * 2013-03-15 2014-09-25 Hitachi Automotive Systems Ltd 蓄電素子および蓄電素子の製造方法
CN112234326A (zh) * 2020-11-20 2021-01-15 苏州凌威新能源科技有限公司 一种电池注液口结构及电池盖板
CN112701428A (zh) * 2021-03-25 2021-04-23 江苏时代新能源科技有限公司 端盖组件、电池单体、电池及用电设备
CN114284652A (zh) * 2021-12-17 2022-04-05 厦门海辰新能源科技有限公司 密封胶钉、电池和储能装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN203013829U (zh) * 2012-09-27 2013-06-19 惠州比亚迪电池有限公司 一种锂离子电池封口阀及锂离子电池
JP2014179288A (ja) * 2013-03-15 2014-09-25 Hitachi Automotive Systems Ltd 蓄電素子および蓄電素子の製造方法
CN112234326A (zh) * 2020-11-20 2021-01-15 苏州凌威新能源科技有限公司 一种电池注液口结构及电池盖板
CN112701428A (zh) * 2021-03-25 2021-04-23 江苏时代新能源科技有限公司 端盖组件、电池单体、电池及用电设备
CN114284652A (zh) * 2021-12-17 2022-04-05 厦门海辰新能源科技有限公司 密封胶钉、电池和储能装置

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