WO2023231209A1

WO2023231209A1 - Sealing assembly, battery cell, battery and electric device

Info

Publication number: WO2023231209A1
Application number: PCT/CN2022/116951
Authority: WO
Inventors: 朱文琪; 李萌; 代学贤
Original assignee: 宁德时代新能源科技股份有限公司
Priority date: 2022-05-30
Filing date: 2022-09-05
Publication date: 2023-12-07
Also published as: CN217485683U

Abstract

Provided in the embodiments of the present application are a sealing assembly, a battery cell, a battery and an electric device. The sealing assembly is used for sealing a liquid injection hole of the battery cell, and comprises a sealing member and a cover member, wherein the sealing member is configured to be inserted into and seal the liquid injection hole; and the cover member is arranged at the end of the sealing member that is away from the interior of the battery cell, and is detachably connected to the battery cell, so that at least part of the sealing member is sandwiched between the cover member and a casing in the axial direction of the liquid injection hole, and seals the liquid injection hole. By means of providing the cover member, the side of the liquid injection hole that is close to the exterior of the battery can be effectively covered, and the implementation of a detachable connection with the liquid injection hole is facilitated; secondly, by means of providing the cover member, more force-bearing structures are also provided, such that holding is facilitated, so as to remove the sealing member from a liquid injection port; thirdly, due to a direct connection between the cover member and the sealing member, the overall structure of the sealing assembly is more compact, thereby improving the integrity of the sealing assembly and reducing the detachment difficulty.

Description

Sealed components, battery cells, batteries and electrical devices

Cross-references to related applications

This application claims priority to Chinese patent application 202221307869.7 titled "Sealed Components, Battery Cells, Batteries and Electrical Devices" submitted on May 30, 2022. The entire content of this application is incorporated herein by reference.

Technical field

The present application belongs to the field of battery technology, and in particular relates to a sealing component, a battery cell, a battery and an electrical device.

Background technique

As the consumption of natural resources and environmental damage become increasingly severe, interest in devices that can store energy and effectively utilize the stored energy is growing in various fields. Battery cells are systems that can be combined with each other to harness new renewable energy.

In the actual use of battery cells, their service life has become one of the obstacles restricting their further promotion. During the use of a battery cell, repeated cycles of charging and discharging are required. This process will cause irreversible consumption of the electrolyte in the battery cell, resulting in a reduction in the capacity of the battery cell and a reduction in the service life of the battery cell. .

Application content

Embodiments of the present application provide a sealing component, a battery cell, a battery and an electrical device. The sealing component can be detachably connected to the liquid injection port to facilitate the replenishment of electrolyte and improve the service life of the battery cell.

A first aspect of the embodiment of the present application provides a sealing assembly for sealing a liquid injection hole of a battery cell. The sealing assembly includes a sealing member and a cover. The sealing member is used to insert and seal the liquid injection hole. The cover is disposed on an end of the seal away from the inside of the battery cell, and is detachably connected to the battery cell, so that at least part of the seal is clamped in the axial direction of the liquid injection hole. It is disposed between the cover and the outer casing of the battery cell and seals the liquid injection hole.

Using the above structure, the cover can effectively cover the side of the liquid injection hole close to the outside of the battery, and facilitate the detachable connection with the liquid injection hole. Secondly, the cover is directly connected to the sealing member, so that the sealing assembly The overall structure is more compact, which improves the integrity of the sealing components and reduces the difficulty of disassembly.

In some optional embodiments of the present application, the cover is configured to be elastically deformable perpendicular to the axial direction of the liquid injection hole.

Using the above structure, by enabling the cover to be elastically deformed in the radial direction of the liquid injection hole, it is convenient to change the area of the cover in the radial direction of the liquid injection hole, so that the cover can move relative to the liquid injection hole.

In some optional embodiments of the present application, the cover includes a contact portion and a snap-on portion. The contact portion is used to press the seal, and the snap-on portion is connected to the contact portion. The outer periphery is used for snapping with the battery cells.

With the above structure, the sealing member can be connected more firmly through the provision of the contact portion and the snap-in portion.

In some optional implementations of the present application, the engaging portion is configured to be elastically deformable relative to the abutting portion.

With the above structure, by configuring the snap-in portion as an elastic structure, the elastic portion can be provided only at the snap-in portion while realizing the snap-in function of the cover, thereby improving the mechanical strength of the cover and making it easier to disassemble the sealing assembly.

In some optional embodiments of the present application, the clamping portion includes a clamping platform and an inclined portion. The inclined portion is connected to the abutting portion and faces away from the seal relative to the abutting portion. One side is bent, and the clamping platform is connected to an end of the inclined portion away from the abutting portion.

With the above structure, through the arrangement of the clamping platform and the inclined portion, the cover can gradually shrink in the radial direction of the liquid injection hole from the clamping platform to the abutment portion, that is, the liquid injection hole in the cover has the largest width in the radial direction. The position is the clamping platform, so when the clamping part is retracted, the clamping platform can be detached from the liquid injection hole, and other positions on the cover can be detached.

In some optional embodiments of the present application, the cover further includes an extension portion, and the extension portion is provided on a side of the clamping platform away from the sealing member.

Using the above structure, through the arrangement of the extension part, the liquid injection hole can be further away from the inside of the battery cell, and can be filled more completely by the cover, thereby improving the sealing of the liquid injection hole. Secondly, the arrangement of the extension part also provides More load-bearing structures make it easier to compress the cover and deform it radially along the liquid injection hole.

In some optional embodiments of the present application, there are multiple snap-in parts, and they are arranged at intervals along the circumference of the abutment part.

In some optional embodiments of the present application, the sealing member is detachably connected to the cover member.

Using the above structure, through the detachable connection between the seal and the cover, seals and covers of different sizes can be combined, which is convenient for users to adjust and replace according to needs.

In some optional embodiments of the present application, the cover is provided with a first protrusion, the seal is provided with a connection groove, and the first protrusion is accommodated in the connection groove.

In some optional implementations of the present application, the first protrusion is threadedly connected to the connection groove.

With the above structure, the sealing member and the cover member can be firmly connected.

In some optional embodiments of the present application, an end of the sealing member away from the cover member is provided with a chamfer.

Using the above structure, through the chamfering arrangement, when the seal is installed, the size of the position that first enters the liquid injection hole is reduced, which has a guiding function and facilitates the installation of the seal into the liquid injection hole.

In some optional embodiments of the present application, a second protrusion is provided on the side of the cover away from the seal.

With the above structure, the cover is easy to hold through the arrangement of the second protrusion.

A second aspect of the embodiment of the present application provides a battery cell, including a casing and the above-mentioned sealing component. The housing is provided with a first wall, the first wall is provided with a liquid injection hole, and the sealing component is connected to the liquid injection hole.

In some optional embodiments of the present application, the housing includes a housing and an end cover, the housing is formed with an opening, the end cover covers the opening of the housing, and the first wall is the Said end cap.

In some optional embodiments of the present application, the liquid injection hole includes a first hole part, a second hole part, and a third hole part arranged sequentially along the thickness direction of the housing, and the cover member includes an extension part, The snap-in part and the abutment part are provided with a lining platform on the sealing member, the snap-in part is provided with a snap-in platform, the first hole part is connected to the extension part, the snap-in part and the abutment part are is disposed in the second hole, and the clamping platform is in contact with the upper edge of the second hole, the lining platform is in contact with the lower edge of the second hole, and the third hole is in contact with the upper edge of the second hole. The seals are connected.

Using the above structure, through the arrangement of the first hole part, the second hole part and the third hole part, the connection strength between the liquid injection hole and the sealing component can be effectively increased, so that each part of the liquid injection hole in the axial direction is connected with the seal. There is an obvious corresponding relationship between various parts on the assembly, which facilitates the installation of the sealing assembly.

In some optional embodiments of the present application, the diameter of the first hole part is larger than the diameter of the third hole part and smaller than the diameter of the second hole part.

Using the above structure, the liquid injection hole and the sealing component can be matched through the hole diameter relationship of the first hole, the second hole and the third hole, which facilitates the installation of the sealing component and realizes snap-on connection, thereby increasing the connection strength.

In some optional embodiments of the present application, in the axial direction of the liquid injection hole, the length of the second hole part is smaller than the length of the clamping part, the contact part and the liner. The sum of thicknesses.

Adopting the above structure, through the length relationship between the second hole part and the clamping part, the abutting part and the lining table, when the clamping part, the abutting part and the lining table are installed in the second hole part, the clamping part The pad is in close contact with the upper edge of the second hole, and the pad is in close contact with the lower edge of the second hole, thereby improving the tightness of the connection between the seal and the third hole.

A third aspect of the embodiment of the present application provides a battery including at least one battery cell as described above.

A fourth aspect of the embodiment of the present application provides an electrical device, including the above-mentioned battery, where the battery is used to provide electrical energy.

Compared with the prior art, in the sealing assembly, battery cell, battery and electrical device of the embodiment of the present application, through the arrangement of the cover, the side of the liquid injection hole close to the outside of the battery can be effectively covered, and it is easy to realize the connection with the battery. The removable connection of the liquid injection hole. Secondly, the setting of the cover also provides more load-bearing structure, which is easy to hold and allows the seal to be taken out from the liquid injection hole. Thirdly, the cover is directly connected to the seal to make the seal The overall structure of the component is more compact, which improves the integrity of the sealing component and reduces the difficulty of disassembly.

Description of the drawings

The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application.

Figure 2 is an exploded schematic diagram of a battery provided by some embodiments of the present application.

FIG. 3 is a schematic structural diagram of the battery module shown in FIG. 2 .

Figure 4 is an exploded schematic diagram of a battery cell provided by some embodiments of the present application.

Figure 5 is a schematic structural diagram of a sealing assembly provided by some embodiments of the present application.

Figure 6 is a schematic structural diagram of a seal provided by some embodiments of the present application.

Figure 7 is a schematic structural diagram of a sealing assembly provided by other embodiments of the present application.

Figure 8 is a schematic structural diagram of a seal provided by other embodiments of the present application.

Figure 9 is a structural cross-sectional view of the liquid injection hole on the battery cell provided by some embodiments of the present application.

In the drawings, the drawings are not necessarily drawn to actual scale.

Detailed ways

The embodiments of the present application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of the present application, but cannot be used to limit the scope of the present application, that is, the present application is not limited to the described embodiments.

In the description of this application, it should be noted that, unless otherwise stated, "plurality" means more than two; the terms "upper", "lower", "left", "right", "inside", " The orientation or positional relationship indicated such as "outside" is only for the convenience of describing the present application and simplifying the description. It does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application. Application restrictions. Furthermore, the terms "first," "second," "third," etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. "Vertical" is not vertical in the strict sense, but within the allowable error range. "Parallel" is not parallel in the strict sense, but within the allowable error range.

Reference in this application to "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

The directional words appearing in the following description are the directions shown in the figures and do not limit the specific structure of the present application. In the description of this application, it should also be noted that, unless otherwise clearly stated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection or a removable connection. Detachable connection, or integral connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application may be understood based on specific circumstances.

In this application, battery cells may include lithium ion secondary battery cells, lithium ion primary battery cells, lithium sulfur battery cells, sodium lithium ion battery cells, sodium ion battery cells or magnesium ion battery cells, etc., The embodiments of the present application are not limited to this. The battery cell may be in the shape of a cylinder, a flat body, a rectangular parallelepiped or other shapes, and the embodiments of the present application are not limited to this.

The battery mentioned in the embodiments of this application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in this application may include a battery module or a battery pack. Batteries generally include a box for packaging one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

At present, in the actual use of battery cells, their service life has become one of the obstacles restricting their further promotion. During the use of a battery cell, repeated cycles of charging and discharging are required. This process will cause irreversible consumption of the electrolyte in the battery cell, reducing the capacity of the battery cell, which is reflected in actual use. The service life is reduced. Therefore, in related technologies, removable sealing nails are provided at the liquid injection holes to replenish electrolyte into the battery cells and alleviate the problem of reduced capacity of the battery cells. However, the battery cells have high requirements for airtightness. The removable sealing nails are usually closely connected to the liquid injection hole and have a complex structure. They are difficult to disassemble and the actual liquid injection efficiency is low.

To this end, the inventor of the present application has designed a detachable sealing nail, which at least includes a sealing part, a connecting part and an elastic member. The sealing part is used to seal the liquid injection hole, and the connecting part is used to realize that the sealing nail and the liquid injection hole are detachable. For connection, the elastic member is provided between the sealing part and the connecting part, and is used to contact the sealing part against the liquid injection hole to enhance the sealing performance. After actual use, the inventor found that during disassembly, it is necessary to dismantle the connecting part and then dismantle the sealing part. The liquid injection work is cumbersome. Secondly, the elastic member is in a deformed state during connection and accumulates a certain elastic potential energy. When the sealing nail is removed, It is also susceptible to the accumulation of elastic potential energy in the elastic part, which accelerates the separation of the connecting part and the sealing part, affecting the disassembly and assembly process.

In order to alleviate the shortcomings of the existing detachable sealing nails, the applicant found that the connection part on the sealing nail can be adjusted, and the connecting part and the snap-in part are directly connected, so that the connection part can be connected with the liquid injection hole at the same time and the function of abutting the sealing part, and is generally suitable for use in battery cells in related technologies.

Based on the above considerations, in order to solve the problem of disassembly of the detachable sealing nail, the inventor of the present application has conducted in-depth research and designed a sealing component, a battery, a battery cell and an electrical device.

Embodiments of the present application provide an electrical device that uses a battery as a power source. The electrical 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 vehicle, a ship, a spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, spaceships, etc.

For the convenience of explanation in the following embodiments, an electric device 1000 according to an embodiment of the present application is used as an example.

As shown in Figure 1, Figure 1 is a schematic structural diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. The battery 100 is disposed inside the vehicle 1000 , and the battery 100 may be disposed at the bottom, head, or tail of the vehicle 1000 . The battery 100 may be used to power the vehicle 1000 , for example, the battery 100 may serve as an operating power source for the vehicle 1000 . The vehicle 1000 may also include a controller 200 and a motor 300 . The controller 200 is used to control the battery 100 to provide power to the motor 300 , for example, for starting, navigating and driving the vehicle 1000 .

In some embodiments of the present application, the battery 100 can not only be used as an operating power source for the vehicle 1000, but also can be used as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

In some embodiments of the present application, please refer to FIG. 2 , which is an exploded schematic diagram of the battery 100 provided in some embodiments of the present application. The battery 100 includes a case 110 and a battery cell 10 (not shown in FIG. 2 ). The battery cell 10 is accommodated in the case 110 . The box 110 is used to accommodate the battery cells 10, and the box 110 can be of various structures. In some embodiments, the box body 110 may include a first box body part 111 and a second box body part 112. The first box body part 111 and the second box body part 112 cover each other. The first box body part 111 and the second box body part 112 cover each other. The two box portions 112 jointly define an accommodation space for accommodating the battery cells 10 . The second box part 112 may be a hollow structure with one end open, and the first box part 111 may be a plate-like structure. The first box part 111 covers the open side of the second box part 112 to form a container with a receiving space. Box 110; the first box part 111 and the second box part 112 can also be hollow structures with one side open, and the open side of the first box part 111 is covered with the open side of the second box part 112, To form a box 110 with an accommodation space. Of course, the first box part 111 and the second box part 112 can be in various shapes, such as cylinder, rectangular parallelepiped, etc.

In some embodiments of the present application, please refer to FIG. 3 , which is a schematic structural diagram of the battery module 120 shown in FIG. 2 . There are multiple battery cells 10 , and the plurality of battery cells 10 are first connected in series, parallel, or mixed to form the battery module 120 . The plurality of battery modules 120 are connected in series, parallel, or mixed to form a whole, and are accommodated in the box 110 (not shown in FIG. 3 ).

In some embodiments of the present application, please refer to FIG. 4 , which is an exploded schematic diagram of the battery cell 10 provided in some embodiments of the present application. The battery cell 10 includes an electrode assembly 30 and a casing 20 , and the electrode assembly 30 is accommodated in the casing 20 . Housing 20 may also be used to contain electrolytes, such as electrolytes. The housing 20 may include a housing 202 and an end cover 201. The housing 202 is a hollow structure with one side open. The end cover 201 covers the opening of the housing 202 and forms a sealed connection to accommodate the electrode assembly 30 and the electrolyte. sealed space. The housing 202 can be in various shapes, such as cylinder, cuboid, etc. The shape of the housing 202 can be determined according to the specific shape of the electrode assembly 30 .

In some embodiments of the present application, please refer to FIGS. 4 to 6 . FIG. 5 is a schematic structural diagram of a sealing assembly provided by some embodiments of the present application. FIG. 6 is a schematic structural diagram of a seal 2 provided by some embodiments of the present application. A sealing assembly is provided for sealing the liquid injection hole 3 of a battery cell. The sealing assembly includes a sealing member 2 and a cover 1 . The seal 2 is used to insert and seal the liquid injection hole 3. The cover 1 is disposed at an end of the seal 2 away from the inside of the battery cell, and is detachably connected to the battery cell, so that at least part of the seal 2 is sandwiched between the cover 1 and the housing 20 in the axial direction of the liquid injection hole 3 between them, and seal the injection hole 3.

In the embodiment of the present application, the cover 1 may be a component used to block the side of the liquid injection hole 3 away from the interior of the battery cell, such as a cover plate, a buckle plate, etc. The seal 2 can be a sealing nail. The liquid injection hole 3 is a through-hole structure that connects the inside and outside of the battery cell, and is used to inject electrolyte into the battery cell. The cross-sectional shape of the liquid injection hole 3 can be set in various shapes. For example, the cross-section of the liquid injection hole 3 can be Round, square, oval or other shapes.

Optionally, the cover 1 is detachably connected to a part of the battery cell, for example, the cover 1 is connected with a mortise and tenon or bolt connection to the case on the 3rd side of the liquid injection hole on the battery cell, or the cover 1 can be connected with The liquid injection hole 3 is threaded or mortise-and-tenon connected, etc., and the seal 2 can be made of rubber material. Alternatively, the cover 1 can be integrally formed with the seal 2 .

Through the arrangement of the cover 1, the side of the liquid injection hole 3 close to the outside of the battery can be effectively covered, and the detachable connection with the liquid injection hole 3 can be easily realized. Secondly, the cover 1 is directly connected to the seal 2 to make the seal The overall structure of the component is more compact, which improves the integrity of the seal component and reduces the difficulty of disassembly. The cover 1 and the shell 20 can clamp the seal 2 to achieve fixation of the seal 2 and improve the sealing performance.

In some optional embodiments of the present application, the cover 1 is configured to be elastically deformable perpendicular to the axial direction of the liquid injection hole 3 .

Alternatively, the liquid injection hole 3 may be a circular hole, and the cover 1 can be elastically deformed in the radial direction of the liquid injection hole 3 . Referring to Figure 5, optionally, the cover 1 can be disc-shaped, and the center of the disc protrudes toward the side connecting the seal 2, and the cover 1 can be elastically deformed along the radial direction of the disc.

By enabling the cover 1 to elastically deform in the radial direction of the liquid injection hole 3 , the area of the cover 1 in the radial direction of the liquid injection hole 3 is facilitated, so that the cover 1 can move relative to the liquid injection hole 3 .

In some optional embodiments of the present application, please refer to Figures 5 and 6. The cover 1 includes a contact portion 11 and a snap portion 12. The contact portion 11 is used to press the seal 2, and the snap portion 12 connects on the outer periphery of the contact portion 11 and used for snapping with the battery cells.

Optionally, the clamping portion 12 and the contact portion 11 may be integrally formed or separately formed.

Alternatively, the contact portion 11 can be configured as a planar structure to facilitate contact with the seal 2. Further, the contact portion 11 can be circular, the seal 2 can be configured as a cylindrical shape, and the seal 2 and the contact portion 11 The concentric arrangement can evenly distribute the force between the contact portion 11 and the seal 2 .

Through the provision of the abutting portion 11 and the engaging portion 12, a portion dedicated to connecting the sealing member 2 is planned on the cover 1, so that the sealing member 2 can be connected more firmly.

In some optional implementations of the present application, the catch portion 12 is configured to be elastically deformable relative to the abutment portion 11 .

Optionally, the clamping portion 12 can be made of elastic material to facilitate the elastic deformation of the clamping portion 12 .

Optionally, the contact portion 11 can be made of a high-hardness material, and the hardness of the contact portion 11 is greater than the hardness of the clamping portion 12 .

By configuring the latch portion 12 as an elastic structure, the elastic portion can be provided only at the latch portion 12 while achieving the latch function of the cover 1 , thereby improving the mechanical strength of the cover 1 .

In some optional implementations of the present application, please refer to FIG. 5 and FIG. 7 . FIG. 7 is a schematic structural diagram of a sealing assembly provided by other embodiments of the present application. The engaging portion 12 includes a engaging platform 122 and an inclined portion 121 . The inclined portion 121 is connected to the abutting portion 11 and is bent toward the side away from the seal 2 relative to the abutting portion 11 . The engaging platform 122 is connected to the inclined portion 121 on one end away from the abutting portion 11 .

Optionally, the clamping platform 122 can be a boss structure protruding from the surface of the cover 1 for the liquid injection hole 3 to abut against. Optionally, the cross section of the inclined portion 121 in the thickness direction of the cover 1 can be set as a trapezoid, with the short side of its parallel sides connected to the abutment portion 11 , and the long side of the parallel sides protruding and extending toward the outside of the trapezoid. The trapezoidal arrangement can facilitate the transmission of force on the inclined portion 121, so that the inclined portion 121 has higher mechanical strength, and the engaging platform 122 formed on the long side facilitates the transmission of the contact force to the inclined portion. part 121, and can firmly connect the clamping platform 122 and the inclined part 121, thereby improving the mechanical strength.

Through the arrangement of the clamping platform 122 and the inclined portion 121, the area of the cover 1 from the clamping platform 122 to the contact portion 11 in the radial direction of the liquid injection hole 3 can gradually shrink, that is, the cover 1 can be filled with liquid. The position with the largest width in the radial direction of the hole 3 is the clamping platform 122. Therefore, when the clamping part 12 is retracted, the clamping platform 122 can be detached from the liquid injection hole 3, and other positions on the cover 1 can be detached. .

In some optional embodiments of the present application, please refer to FIGS. 5 and 7 , the cover 1 further includes an extension 13 , and the extension 13 is provided on the side of the clamping platform 122 away from the seal 2 .

Optionally, the extension 13 can be configured to cooperate with the side of the liquid injection hole 3 facing away from the inside of the battery cell, and can cover the opening on the side of the liquid injection hole 3 facing away from the inside of the battery cell. For example, the extension 13 can be a cover. Plate structure. Furthermore, the extension part 13 may be an annular thin wall, and extends from the inner wall of the liquid injection hole 3 on the side facing away from the interior of the battery cell.

Optionally, the extension part 13 is also provided with a convex structure that protrudes from the surface of the extension part 13 to provide an area for holding, so as to facilitate the compression deformation of the cover 1 and remove the sealing assembly from the liquid injection hole.

Through the arrangement of the extension part 13, the side of the liquid injection hole 3 that is far away from the inside of the battery cell can be filled more completely by the cover 1, thereby improving the sealing performance of the liquid injection hole 3. Secondly, the arrangement of the extension part 13 also provides More load-bearing structures are provided to facilitate compression of the cover 1 so that it can deform radially along the liquid injection hole 3 .

In some optional implementations of this application, please refer to Figure 7. A plurality of latching portions 12 are provided and spaced apart along the circumferential direction of the contact portion 11 .

Optionally, eight snap-in parts 12 are arranged in a circumferential array along the abutment part 11 , and adjacent snap-in parts 12 are separated by deformation grooves 16 . The number of snap-in parts 12 may also be other and the application embodiment does not do so. limit.

In some optional embodiments of the present application, the sealing member 2 and the cover member 1 are detachably connected.

Alternatively, the sealing member 2 and the cover member 1 may be connected through bolt connection, mortise and tenon connection, snap connection, etc.

Through the detachable connection between the seal 2 and the cover 1, seals 2 and covers 1 of different sizes can be combined, which is convenient for users to adjust and replace according to needs.

In some optional embodiments of the present application, please refer to FIGS. 5 and 7 , a second protrusion 15 is provided on the side of the cover 1 away from the seal 2 .

Optionally, the second protrusion 15 may be cylindrical, and in some embodiments, the second protrusion 15 may be provided with rough structures such as grooves to facilitate holding.

In some optional embodiments of the present application, please refer to FIGS. 6 and 8 , the end of the sealing member 2 away from the cover 1 is provided with a chamfer 23 .

Optionally, the chamfer 23 is provided between the bottom surface and the side surface of the sealing member 2 away from the cover 1 .

Through the arrangement of the chamfer 23, when the seal 2 is installed, the size of the position that first enters the liquid injection hole 3 is reduced, making it easier for the seal 2 to be installed into the liquid injection hole 3.

In some optional embodiments of the present application, please refer to Figures 6 and 8. The edge of the opening side of the connecting groove 21 on the seal 2 is also provided with a hole extending radially away from the connecting groove 21 along the liquid injection hole 3. The lining 22.

In some optional implementations of the present application, please refer to FIGS. 7 to 9 . FIG. 8 is a schematic structural diagram of the seal 2 provided in other embodiments of the present application. Figure 9 is a structural cross-sectional view of the liquid injection hole 3 on the battery cell provided by some embodiments of the present application. The cover 1 is provided with a first protruding portion 14 , the sealing member 2 is provided with a connecting groove 21 , and the first protruding portion 14 is accommodated in the connecting groove 21 .

Alternatively, the first protrusion 14 can be cylindrical and arranged concentrically with the abutment portion 11 , and the connecting groove 21 can be a cylindrical groove and arranged concentrically with the seal 2 , so that the seal 2 and the cover 1 are concentric. The shaft is arranged so that all parts of the seal assembly can bear even force.

In some optional implementations of the present application, please refer to FIG. 9 , the first protrusion 14 is threadedly connected to the connecting groove 21 .

Optionally, a first thread is provided on the outer periphery of the first protrusion 14, a second thread is provided on the inner wall of the connecting groove 21, and the first thread and the second thread are matched and connected.

In some optional implementations of the present application, please refer to FIG. 4 and FIG. 9 , which provides a battery cell including a casing 20 and the above-mentioned sealing component. The housing 20 is provided with a first wall, and the first wall is provided with a liquid injection hole 3. The sealing assembly is connected to the liquid injection hole 3, so that the liquid injection hole 3 can be arranged on any wall surface of the housing 20.

Optionally, the first wall can be any wall surface on the housing 20 , such as the top wall, side walls, and end caps of the housing 20 .

In some optional embodiments of the present application, please refer to Figure 4. The housing 20 includes a housing 202 and an end cover 201. The housing 202 is formed with an opening. The end cover 201 covers the opening of the housing 202. The first wall is The end cover 201 and the liquid injection hole 3 are provided on the end cover 201, which facilitates the processing and molding of the liquid injection hole 3 and facilitates the integral molding of the housing 202 to improve the sealing performance. Optionally, the end cover 201 may be provided with components such as insulators and electrode terminals for sealing the battery cells and discharging electric energy from the battery cells.

In some optional embodiments of the present application, please refer to Figures 5 and 9. The liquid injection hole 3 includes a first hole part 31, a second hole part 32 and a third hole part 33 arranged sequentially along the thickness direction of the shell. The cover 1 includes an extension part 13, a snap-in part 12 and a contact part 11. The seal 2 is provided with a lining platform 22, the snap-in part 12 is provided with a snap-in platform 122, and the first hole part 31 is opposite to the extension part 13. Connected, the snap-in part 12 and the contact part 11 are disposed in the second hole part 32, and the snap-in platform 122 is in contact with the upper edge of the second hole part 32, and the lining platform 22 is in contact with the lower edge of the second hole part 32, The third hole portion 33 is connected to the sealing member 2 .

Optionally, the clamping platform 122 is also provided with a clamping surface 1221 on the side away from the sealing member 2 in the thickness direction of the cover 1 for abutting against the upper edge of the second hole portion 32 .

Through the arrangement of the first hole part 31, the second hole part 32 and the third hole part 33, there is an obvious corresponding relationship between each part of the liquid injection hole 3 in the axial direction and each part of the sealing assembly, which facilitates the sealing assembly. When installed, the main part of the sealing member 2 can completely fill the third hole 33, and its pad 22 can be placed on the side of the third hole 33 away from the inside of the battery cell, thereby completely sealing the third hole 33. .

In some optional implementations of the present application, please refer to FIG. 9 , the diameter of the first hole part 31 is larger than the diameter of the third hole part 33 and smaller than the diameter of the second hole part 32 .

Through the hole diameter relationship between the first hole part 31 , the second hole part 32 and the third hole part 33 , the liquid injection hole 3 can have hole diameter conversion in its axial direction, so that after the sealing assembly is installed, the various parts in the liquid injection hole 3 Mutually shielding effectively improves the sealing of the liquid injection hole 3.

In some optional embodiments of the present application, please refer to FIG. 9 . In the axial direction of the liquid injection hole 3 , the length of the second hole part 32 is smaller than the length of the catch part 12 , the contact part 11 and the liner 22 . The sum of thicknesses.

Through the length relationship between the second hole 32 and the latching part 12 , the contacting part 11 and the lining 22 , the latching part 12 , the contacting part 11 and the lining 22 can be installed in the second hole 32 At this time, the engaging portion 12 is in close contact with the upper edge of the second hole portion 32 , and the pad 22 is in close contact with the lower edge of the second hole portion 32 , thereby improving the tightness of the connection between the seal 2 and the third hole portion 33 .

In some optional embodiments of the present application, a battery is also provided, including at least one battery cell as described above.

In some optional embodiments of the present application, an electrical device is also provided, including the above-mentioned battery, and the battery is used to provide electrical energy.

In some optional embodiments of the present application, the sealing assembly includes a cover 1 and a seal 2. The cover 1 includes a contact portion 11, a snap portion 12 and an extension portion 13. The contact portion 11 is circular and planar, There are eight snap-in parts 12 , and they are arranged in a circumferential array with the contact parts 11 on the side away from the seal 2 . The snap-in part 12 includes an inclined part 121 and a locking platform 122 . One end of the inclined part 121 is connected to the contact part 11 The other end is connected to the clamping platform 122. The clamping platform 122 is also provided with an extension part 13 extending to the side away from the sealing member 2. The contact part 11 is also provided with a grip rod on the side away from the sealing member 2. , the contact portion 11 is also provided with a connecting rod on the side facing the seal 2. The seal 2 is cylindrical, with a connecting groove 21 and a lining 22 provided on it. The connecting rod is connected to the connecting groove 21. Further, the liquid injection hole 3 includes a first hole part 31, a second hole part 32 and a third hole part 33 which are superimposed. The diameter of the first hole part 31 is larger than the diameter of the third hole part 33 and smaller than the diameter of the second hole part 32. In the axial direction of the liquid injection hole 3 , the length of the second hole portion 32 is smaller than the sum of the thicknesses of the catch portion 12 , the contact portion 11 and the liner 22 . The first hole part 31 is connected to the extension part 13, the snap-in part 12 and the contact part 11 are disposed in the second hole part 32, and the snap-in platform 122 is in contact with the upper edge of the second hole part 32, and the lining platform 22 is in contact with the upper edge of the second hole part 32. The lower edge of the second hole 32 abuts, and the third hole 33 is connected to the main body of the seal 2 .

In the sealing assembly, battery cell, battery and electrical device according to the embodiment of the present application, through the arrangement of the cover 1, the side of the liquid injection hole 3 close to the outside of the battery can be effectively covered, and the connection with the liquid injection hole 3 can be facilitated. The connection is detachable. Secondly, the setting of the cover 1 also provides more load-bearing structure, which is easy to hold, so that the seal 2 can be taken out from the liquid filling port. Third, the cover 1 and the seal 2 are directly connected to make the seal The overall structure of the component is more compact, which improves the integrity of the sealing component and reduces the difficulty of disassembly.

Although the application has been described with reference to preferred embodiments, various modifications may be made and equivalents may be substituted for parts thereof without departing from the scope of the application, in particular provided that no structural conflicts exist , the technical features mentioned in each embodiment can be combined in any way. The application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

A sealing component used to seal the liquid injection hole of a battery cell, the sealing component includes:

a seal for inserting and sealing the liquid injection hole; and

A cover, disposed at an end of the seal away from the inside of the battery cell, and detachably connected to the battery cell, so that at least part of the seal is sandwiched in the axial direction of the liquid injection hole Between the cover and the casing of the battery cell and sealing the liquid injection hole, the cover is configured to be elastically deformable perpendicular to the axial direction of the liquid injection hole.
The sealing assembly according to claim 1, wherein the cover includes a contact portion and a snap-on portion, the contact portion is used to press the seal, and the snap-on portion is connected to the contact portion. The outer periphery is used for clamping with the battery cells.
The seal assembly of claim 2, wherein the catch portion is configured to be elastically deformable relative to the abutment portion.
The sealing assembly according to claim 2 or 3, wherein the engaging portion includes a engaging platform and an inclined portion, the inclined portion is connected to the abutting portion and faces away from the abutting portion relative to the abutting portion. One side of the sealing member is bent, and the clamping platform is connected to an end of the inclined portion away from the abutting portion.
The sealing assembly according to any one of claims 2 to 4, wherein a plurality of said engaging portions are provided and are spaced apart along the circumferential direction of the abutting portion.
The sealing assembly according to claim 4, wherein the cover further includes an extension portion, and the extension portion is provided on a side of the clamping platform away from the sealing member.
The sealing assembly according to any one of claims 1-6, wherein the sealing member and the cover member are detachably connected.
The seal assembly according to claim 7, wherein the cover is provided with a first protrusion, the seal is provided with a connecting groove, and the first protrusion is accommodated in the connection groove.
The seal assembly of claim 8, wherein the first protrusion is threadedly connected to the connecting groove.
The seal assembly according to any one of claims 1 to 9, wherein an end of the seal member away from the cover member is provided with a chamfer.
The sealing assembly according to any one of claims 1 to 10, wherein a second protrusion is provided on the side of the cover member away from the sealing member.
A battery cell including:

A shell is provided with a first wall, and the first wall is provided with a liquid injection hole;

The sealing assembly according to any one of claims 1 to 11, said sealing assembly being connected to said liquid injection hole.
The battery cell according to claim 12, wherein the casing includes a casing and an end cover, the casing is formed with an opening, the end cover covers the opening of the casing, and the first wall for the end cap.
The battery cell according to claim 13, wherein the liquid injection hole includes a first hole, a second hole and a third hole sequentially arranged along the thickness direction of the case, and the cover includes an extension part, a snap-in part and a contact part, the seal is provided with a lining platform, the snap-in part is provided with a snap-in platform, the first hole part is connected to the extension part, the snap-in part and The contact portion is disposed in the second hole, and the clamping platform is in contact with the upper edge of the second hole, the pad is in contact with the lower edge of the second hole, and the third hole is part is connected to the seal.
The battery cell according to claim 14, wherein the diameter of the first hole part is larger than the diameter of the third hole part and smaller than the diameter of the second hole part.
The battery cell according to claim 14 or 15, wherein in the axial direction of the liquid injection hole, the length of the second hole part is shorter than the latch part, the contact part and the liner. The sum of the thicknesses of the three.
A battery including at least one battery cell according to any one of claims 12-16.
An electrical device includes the battery as claimed in claim 17, the battery being used to provide electrical energy.