A sealing device, cover plate assembly and battery

Abstract

The utility model discloses a sealing device, cover plate subassembly and battery. The sealing device is used for sealing the liquid injection hole of battery, and the sealing device includes sealing base and sealing inner core. Wherein, the sealing base includes base body and first plug, and the base body has the first face and the second face opposite along the first direction, and the first plug is arranged on the second face, and the first plug is used for sealing and inserting with the liquid injection hole, and the base body is used for covering the peripheral area of liquid injection hole, and the sealing base has the through -hole through the base body and the first plug, and the sealing inner core is sealed and inserted in the through -hole from the direction of the first face to the second face, and the part of sealing inner core in the through -hole and / or the hole wall of the through -hole is provided with the first protruding part, so that the sealing inner core is provided with the interference fit with the through -hole. The sealing device can effectively avoid the residual electrolyte in the periphery of liquid injection hole during formation process, and is favorable for improving the quality of sealing nail sealing welding in the liquid injection hole.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a sealing device, a cover plate assembly, and a battery. Background Technology

[0002] The production process of lithium batteries includes steps such as cell fabrication, casing, electrolyte injection, formation, capacity testing, and inspection. Formation is the initialization of the battery, and it is the first charge-discharge process after electrolyte injection. Formation activates the positive and negative electrode materials inside the battery and forms a solid electrolyte interface film on the surface of the negative electrode. After electrolyte injection, the injection hole is temporarily sealed by a sealing device. During the formation process, the sealing device is removed, and a negative pressure suction nozzle is pressed against the injection hole to perform negative pressure evacuation and simultaneous charge-discharge.

[0003] However, after the negative pressure suction ends, the negative pressure nozzle will detach from the injection hole. Due to the release of negative pressure and the gap between the negative pressure nozzle and the injection hole, a small amount of electrolyte will remain around the injection hole. This part of the electrolyte is prone to crystallization due to the high temperature inside the formation chamber, which can lead to poor welding quality when the sealing nail is welded to the injection hole later. Utility Model Content

[0004] This application discloses a sealing device, a cover plate assembly, and a battery, which can effectively prevent electrolyte residue around the injection hole during the formation process, thereby improving the quality of sealing the sealing nail welded to the injection hole.

[0005] To achieve the above objectives, in a first aspect, embodiments of this application disclose a sealing device for sealing the electrolyte filling hole of a battery, the sealing device comprising:

[0006] A sealing base, comprising a base body and a first connector, the base body having a first surface and a second surface opposite to each other along a first direction, the first connector being disposed on the second surface, the first connector being used for sealingly inserting into the injection hole, the base body being used to cover the peripheral area of ​​the injection hole, and the sealing base having a through hole penetrating the base body and the first connector.

[0007] A sealing core is inserted into the through hole in a direction from the first surface to the second surface. The portion of the sealing core located inside the through hole and / or the wall of the through hole are provided with a first protrusion so that the sealing core and the through hole are interference-fitted.

[0008] Optionally, a first countersunk hole is provided on the first surface, and the first countersunk hole communicates with and is coaxially arranged with the through hole;

[0009] The sealed inner core includes an inner core body and a second connector that are connected to each other. The cross-sectional area of ​​the inner core body is larger than the cross-sectional area of ​​the second connector. A portion of the inner core body is embedded in the first countersunk hole. The second connector is located at the end of the inner core body facing the first connector. The second connector is sealed and inserted into the through hole. The first protrusion is located on the second connector.

[0010] Optionally, the inner core body is provided with one end opposite to the second connector protruding from the base body along the first direction.

[0011] Optionally, the sealing base is an elastic sealing base, and / or the sealing inner core is an elastic sealing inner core.

[0012] Optionally, a stop portion is provided on the first surface, and the stop portion is arranged around the edge of the base body.

[0013] Optionally, the battery further includes a cover plate having a third side and a fourth side disposed opposite to each other, the liquid injection hole being disposed on the cover plate and penetrating the fourth side, and a second countersunk hole being disposed on the third side, the second countersunk hole communicating with the liquid injection hole and being coaxially disposed;

[0014] The first connector includes a first plug section and a second plug section connected to each other along the first direction. The cross-sectional area of ​​the first plug section is larger than the cross-sectional area of ​​the second plug section. The first plug section is used to be embedded in the second countersunk hole, and the second plug section is used to be sealed and plugged into the injection hole.

[0015] Optionally, the battery further includes a cover plate having a third side and a fourth side disposed opposite to each other, the fourth side being disposed facing the inside of the battery, and the liquid injection hole being disposed on the cover plate and penetrating the third side and the fourth side;

[0016] The first connector is provided with a second protrusion, which is used to abut against the fourth surface when the first connector is sealed and inserted into the injection hole.

[0017] Optionally, a guide slope is provided on the outer wall of the first connector, the guide slope being used to guide the first connector to be sealed and inserted into the injection hole.

[0018] Secondly, embodiments of this application also disclose a cover plate assembly, comprising:

[0019] A cover plate, wherein the liquid injection hole is provided on the cover plate;

[0020] In any one of the first aspects, the sealing device has the first plug-in sealed into the injection hole, the second surface of the base body abutting against the cover plate, and the base body covering the peripheral area of ​​the injection hole.

[0021] Thirdly, this application also discloses a battery, comprising:

[0022] A housing having an inner cavity and an opening communicating with the inner cavity;

[0023] The battery cell is housed within the inner cavity;

[0024] The cover assembly described in the second aspect seals and covers the opening.

[0025] Compared with the prior art, this application has at least the following beneficial effects:

[0026] In this application, the sealing base includes a base body and a first connector. The first connector is used for sealing and inserting with the injection hole. The base body is used to cover the surrounding area of ​​the injection hole. The sealing base has a through hole penetrating the base body and the first connector. When the negative pressure nozzle is disengaged from the through hole during the formation process of the battery with the sealing device inserted, a small amount of electrolyte carried out or sprayed out can fall onto the base body. This effectively prevents electrolyte residue around the injection hole and prevents poor quality when sealing the sealing nail to the injection hole due to electrolyte residue. At the same time, it also avoids the need to wipe the area around the injection hole due to electrolyte residue. It eliminates the need for a structure to wipe the area around the injection hole after formation, reduces costs, and effectively improves battery production efficiency. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a perspective view of a sealing device provided in an embodiment of this application;

[0029] Figure 2 This is a front view of a sealing device provided in an embodiment of this application;

[0030] Figure 3 This is a top view of a sealing device provided in an embodiment of this application;

[0031] Figure 4This is a cross-sectional view of a sealing device provided in an embodiment of this application;

[0032] Figure 5 This is a perspective view of a cover plate assembly provided in an embodiment of this application;

[0033] Figure 6 This is a cross-sectional view of a cover plate assembly provided in an embodiment of this application;

[0034] Figure 7 This is an exploded view of a battery provided in an embodiment of this application.

[0035] Explanation of reference numerals in the attached figures:

[0036] 1-Sealed base; 11-Base body; 111-First surface; 112-Second surface; 113-Stop; 12-First connector; 121-First connector section; 122-Second connector section; 1221-Second protrusion; 1222-Guide slope; 13-Through hole; 14-First countersunk hole;

[0037] 2-Sealed inner core; 21-Inner core body; 22-Second connector; 221-First protrusion;

[0038] 1000 - Battery; 100 - Casing; 200 - Cover assembly; 10 - Sealing device; 20 - Cover; 210 - Injection hole; 220 - Third side; 230 - Fourth side; 240 - Second countersunk hole; 300 - Cell. Detailed Implementation

[0039] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0040] In this invention, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this invention and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0041] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0042] Furthermore, the terms "installation," "setup," "equipped with," "connection," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of these terms in this utility model based on the specific circumstances.

[0043] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0044] Based on the problems described in the background art, this application discloses a sealing device, a cover plate assembly, and a battery, which can effectively avoid electrolyte residue around the injection hole during the formation process, and help improve the quality of subsequent sealing and welding of the sealing nail to the injection hole.

[0045] The technical solution of this application will be described in detail below with reference to specific embodiments and accompanying drawings.

[0046] This application provides a sealing device for sealing the electrolyte filling hole of a battery, such as... Figures 1-6 As shown, the sealing device 10 includes a sealing base 1 and a sealing core 2. The sealing base 1 includes a base body 11 and a first connector 12. The base body 11 has a sealing core along a first direction (e.g., ...). Figure 4 The first surface 111 and the second surface 112 are opposite to each other (as shown in x1). The first connector 12 is disposed on the second surface 112 and is used for sealing and connecting with the injection hole 210. The base body 11 is used to cover the peripheral area of ​​the injection hole 210. The sealing base 1 has a through hole 13 that penetrates the base body 11 and the first connector 12. The sealing inner core 2 points from the first surface 111 to the second surface 112 (as shown in x1). Figure 4 (In the direction shown by x2) the sealing core 2 is inserted into the through hole 13. The portion of the sealing core 2 located inside the through hole 13 and / or the wall of the through hole 13 is provided with a first protrusion 221 so that the sealing core 2 and the through hole 13 are interference fit.

[0047] In this embodiment, the first connector 12 of the sealing base 1 is used to seal and insert with the injection hole 210, and the sealing inner core 2 is sealed and inserted into the through hole 13 in the direction from the first surface 111 to the second surface 112. This allows the sealing device to seal the injection hole 210 to prevent the electrolyte in the battery from leaking from the injection hole 210, which is beneficial to improving the battery quality.

[0048] The sealing base 1 includes a base body 11 and a first connector 12. The first connector 12 is used for sealing and inserting into the injection hole 210. The base body 11 is used to cover the surrounding area of ​​the injection hole 210. The sealing base 1 has a through hole 13 penetrating the base body 11 and the first connector 12, so that when performing the formation process on the battery with the sealing device 10 inserted, after the sealing core 2 is pulled out from the through hole 13, the negative pressure suction nozzle can be applied to the through hole 13 to perform negative pressure suction on the battery. When the negative pressure suction ends and the negative pressure suction nozzle is disengaged from the through hole 13, the battery can be degassed. A small amount of electrolyte that is discharged or sprayed falls onto the base body 11, such as the first surface 111 of the base body 11. This effectively prevents electrolyte residue from remaining around the injection hole 210 during the formation process. It also prevents poor quality when sealing the sealing nail to the injection hole 210 due to electrolyte residue around the injection hole 210. At the same time, it avoids the need to wipe the area around the injection hole 210 due to electrolyte residue. This eliminates the need for a structure to wipe the area around the injection hole 210 after formation, reducing costs and effectively improving battery production efficiency.

[0049] The sealing core 2 is provided with a first protrusion 221 in the part located in the through hole 13 and / or on the hole wall of the through hole 13, so that the sealing core 2 is interference-fitted with the through hole 13. This makes it difficult for the sealing core 2 to slip out of the through hole 13 after it is sealed and inserted into the through hole 13. After the sealing device 10 seals the liquid injection hole 210, it effectively prevents the electrolyte in the battery from flowing out of the through hole 13.

[0050] It should be explained that the first connector 12 is used for sealing connection with the injection hole 210. When the first connector 12 is inserted into the injection hole 210, the outer peripheral wall of the first connector 12 abuts against the hole wall of the injection hole 210, so that the electrolyte can only pass through the through hole 13, and there will be no leakage of electrolyte from the first connector 12 and the hole wall of the injection hole 210.

[0051] The first protrusion 221 may be provided on the part of the sealing inner core 2 located inside the through hole 13, or the first protrusion 221 may be provided on the hole wall of the through hole 13, or the first protrusion 221 may be provided on both the part of the sealing inner core 2 located inside the through hole 13 and the hole wall of the through hole 13.

[0052] In addition, the first protrusion 221 is disposed around the outer wall of the portion of the sealing inner core 2 located in the through hole 13 along the circumference of the through hole 13, or is disposed around the hole wall of the through hole 13 along the circumference of the through hole 13, so that the sealing inner core 2 can abut against the hole wall of the through hole 13 at all points along the circumference of the through hole 13, thereby improving the sealing performance of the sealing inner core 2 to the through hole 13.

[0053] For example, such as Figure 4 As shown, the first protrusion 221 can be circumferentially arranged around the portion of the sealing core 2 located in the through hole 13 on the outer wall of the portion of the through hole 13. At this time, a groove matching the first protrusion 221 can be provided on the hole wall of the through hole 13. When the sealing core 2 is sealed and inserted into the through hole 13, the first protrusion 221 can be embedded in the groove, which further prevents the sealing core 2 from accidentally sliding out of the through hole 13, and is conducive to improving the sealing performance of the sealing device 10 to the injection hole 210.

[0054] During battery manufacturing, after the first electrolyte injection, the sealing base 1 can be first inserted into the injection hole 210, and then the sealing core 2 can be inserted into the through hole 13 to seal the injection hole 210. Alternatively, the sealing core 2 can be inserted into the through hole 13, and then the sealing core 2 and the sealing base 1 can be inserted together into the injection hole 210. Then, before the negative pressure formation process, the sealing core 2 is pulled out from the through hole 13 using a pin-pulling device before the battery is sent into the formation process. Inside the cavity, after negative pressure formation, electrolyte can remain on the sealing base 1, preventing electrolyte residue near the injection hole 210 from affecting subsequent welding of the sealing pins; then, the sealing core 2 can be re-sealed into the through hole 13 to seal the injection hole 210 again. When the battery is injected with electrolyte for the second time, the sealing base 1 and the sealing core 2 can be pulled out from the injection hole 210 by a pin-pulling machine to facilitate the secondary injection of the battery and the sealing welding of the injection hole 210 by the sealing pins.

[0055] Optionally, such as Figure 4 As shown, a first countersunk hole 14 is provided on the first surface 111. The first countersunk hole 14 is connected to and coaxially arranged with the through hole 13. The sealing inner core 2 includes an inner core body 21 and a second connector 22 connected to each other. The cross-sectional area of ​​the inner core body 21 is larger than the cross-sectional area of ​​the second connector 22. A portion of the inner core body 21 is embedded in the first countersunk hole 14. The second connector 22 is provided at the end of the inner core body 21 facing the first connector 12. The second connector 22 is sealed and inserted into the through hole 13. A first protrusion 221 is provided on the second connector 22.

[0056] Therefore, when the sealing core 2 is inserted into the through hole 13, the inner core body 21 and the first countersunk hole 14 can cooperate to position the depth of the sealing core 2 inserted into the through hole 13. This ensures that the sealing core 2 can seal the through hole 13 well, and also effectively prevents the sealing core 2 from being difficult to pull out of the through hole 13 due to the second connector 22 being inserted too deeply into the through hole 13.

[0057] When the inner core body 21 is partially sealed and embedded in the first countersunk hole 14, the inner core body 21 can also seal the through hole 13, so that the sealing effect of the sealing inner core 2 on the through hole 13 is better.

[0058] Furthermore, the through hole 13 can be circular, rectangular, or triangular; no limitation is made here. Correspondingly, the second connector 22 can be cylindrical, prismatic, or elliptical; no limitation is made here, as long as the second connector 22 can seal the insertion through hole 13.

[0059] The first countersunk hole 14 mentioned above can be a circular countersunk hole or a countersunk hole of other shapes, and is not limited here.

[0060] Optionally, the inner core body 21 can be a columnar structure to facilitate the nail removal machine to clamp the sealing inner core 2, which greatly facilitates the removal of the sealing inner core 2 from the through hole 13.

[0061] In addition, such as Figure 1 , Figure 2 and Figure 4 As shown, the inner core body 21 is positioned so as to protrude from the base body 11 along the first direction at one end opposite to the second connector 22.

[0062] This further facilitates the clamping of the inner core body 21 by the nail puller, making it easier for the sealed inner core 2 to be pulled out of the through hole 13 by the nail puller.

[0063] The aforementioned sealing base 1 is an elastic sealing base 1, or the sealing inner core 2 is an elastic sealing inner core 2, or the sealing base 1 is an elastic sealing base 1 and the sealing inner core 2 is an elastic sealing inner core 2.

[0064] Therefore, when the sealing core 2 is inserted into the through hole 13, at least one of the sealing core 2 and the sealing base 1 can undergo elastic deformation, which not only makes it easy to ensure that the sealing core 2 is sealed and inserted into the through hole 13, but also makes it easier to insert the sealing core 2 into the through hole 13.

[0065] The sealing base 1 can be made of any of the following materials: rubber, silicone, ethylene-octene copolymer, etc., without limitation. The sealing core 2 can be made of the same material as the sealing base 1, or a different material, without limitation.

[0066] In addition, the sealing base 1 can be injection molded, which facilitates the production of the sealing base 1, and the sealing core 2 can also be injection molded, which facilitates the production of the sealing core 2.

[0067] In some embodiments, such as Figure 1 and Figure 4 As shown, a stop portion 113 is provided on the first surface 111, and the stop portion 113 is arranged around the edge of the base body 11.

[0068] Therefore, the stop portion 113 can be used to form a accommodating space on the first surface 111, so that when the negative pressure ends, a small amount of electrolyte that is carried out or sprayed out remains in the accommodating space, effectively preventing electrolyte from splashing onto other areas of the cover plate 20, and effectively preventing the electrolyte residue on other areas of the cover plate 20 from affecting the subsequent processes of the battery.

[0069] The stop part 113 is a protruding structure provided around the edge of the base body 11. It can be arranged around the edge of the base body 11 to form an accommodating space on the first surface 111. This allows a small amount of electrolyte that is carried out or sprayed out due to the negative pressure nozzle disengaging from the through hole 13 to be located in the accommodating space, effectively preventing the residual electrolyte from flowing to other locations. This ensures that when the sealing device 10 is subsequently pulled out from the injection hole 210, all the residual electrolyte can be taken away, which is beneficial to improving battery quality.

[0070] The aforementioned battery may include a cover assembly 200, which may include a cover 20. The cover 20 has a third surface 220 and a fourth surface 230 disposed opposite to each other. The fourth surface 230 is disposed towards the inside of the battery, that is, when the cover assembly 200 is placed on the battery casing, the fourth surface 230 is disposed towards the space inside the casing. The liquid injection hole 210 is disposed on the cover 20 and penetrates the fourth surface 230. A second countersunk hole 240 is disposed on the third surface 220. The second countersunk hole 240 communicates with the liquid injection hole 210 and is coaxially disposed. The first connector 12 includes a first insertion section 121 and a second insertion section 122 connected to each other along a first direction. The cross-sectional area of ​​the first insertion section 121 is larger than the cross-sectional area of ​​the second insertion section 122. The first insertion section 121 is used to be embedded in the second countersunk hole 240, and the second insertion section 122 is used to be sealed and inserted into the liquid injection hole 210.

[0071] Therefore, when the first connector 12 is inserted into the injection hole 210, the cooperation between the first connector segment 121 and the second countersunk hole 240 can prevent the second connector segment 122 from being inserted too deeply into the injection hole 210. This ensures that the first connector 12 can seal the injection hole 210 while also preventing the first connector 12 from contacting the electrolyte in the battery due to being inserted too deeply into the injection hole 210. This also prevents the electrolyte from being carried out and wasted when the sealing device 10 is pulled out later.

[0072] The first insertion section 121 can be sealed and embedded in the second countersunk hole 240 to improve the sealing performance of the first insertion section 12 to the injection hole 210.

[0073] In addition, when the first connector 12 is sealed and inserted into the injection hole 210, the second surface 112 of the base body 11 can abut against the third surface 220 of the cover plate 20. The base body 11 can further limit the depth of the first connector 12 inserted into the injection hole 210.

[0074] When the second countersunk hole 240 is not provided on the third surface 220 of the cover plate 20, the injection hole 210 penetrates the third surface 220 and the fourth surface 230 of the cover plate 20.

[0075] In some embodiments, such as Figures 4-6 As shown, the first connector 12 is provided with a second protrusion 1221, which is used to abut against the fourth surface 230 when the first connector 12 is sealed and inserted into the injection hole 210.

[0076] This allows the first connector 12 to be securely inserted into the injection hole 210, effectively preventing accidental leakage of electrolyte due to the first connector 12 accidentally coming out of the injection hole 210.

[0077] The second protrusion 1221 may be a protruding ring circumferentially disposed on the outer wall of the first connector 12 along the through hole 13, or it may be a protrusion protruding on the outer wall of the first connector 12, or the second protrusion 1221 may include a plurality of protrusions, which are spaced apart circumferentially on the outer wall of the first connector 12 along the through hole 13. No limitation is made here.

[0078] In other embodiments, such as Figure 4 As shown, a guide slope 1222 is provided on the outer wall of the first connector 12. The guide slope 1222 is used to guide the first connector 12 to be sealed and inserted into the injection hole 210.

[0079] Therefore, it is simple and convenient to insert the first connector 12 into the injection hole 210.

[0080] The guide slope 1222 can be a guide slope plane or a guide slope arc surface, as long as it can guide the first plug 12 to be sealed and inserted into the injection hole 210. There is no limitation here.

[0081] Alternatively, the guide slope 1222 may be a slope surrounding the outer wall of the first connector 12, or the guide slope 1222 may include guide slope 1222 and guide slope 1222 arranged radially opposite to each other along the through hole 13, or the guide slope 1222 may include multiple guide sub-slopes, which are spaced apart circumferentially along the through hole 13 on the outer wall of the first connector 12. No limitation is made here.

[0082] This application also discloses a cover plate assembly, such as... Figure 5 and Figure 6 As shown, the cover plate assembly 200 includes a cover plate 20 and a sealing device 10 of any of the above embodiments. The cover plate 20 is provided with an injection hole 210. The first connector 12 of the sealing device 10 of any of the above embodiments is sealed and inserted into the injection hole 210. The second surface 112 of the base body 11 abuts against the cover plate 20, and the base body 11 covers the surrounding area of ​​the injection hole 210.

[0083] Therefore, since the sealing device 10 in the cover plate assembly 200 is the sealing device 10 of any of the above embodiments, the sealing device 10 in the cover plate assembly 200 has the same technical effect as the sealing device 10 of any of the above embodiments. Since the sealing device 10 has been described in detail in the above embodiments, it will not be repeated here.

[0084] This application also discloses a battery, such as... Figure 7 As shown, the battery 1000 includes a housing 100, a battery cell 300, and a cover assembly 200 as described in the above embodiments. The housing 100 has an inner cavity and an opening communicating with the inner cavity. The battery cell 300 is housed in the inner cavity, and the cover assembly 200 seals and covers the opening.

[0085] In this embodiment, since the cover assembly 200 in the battery 1000 is the same as the cover assembly 200 in the above embodiments, the cover assembly 200 in the battery 1000 has substantially the same technical effects as the cover assembly 200 in the above embodiments, and will not be described again here; and since the sealing device 10 in the cover assembly 200 is the sealing component of any of the above embodiments, the sealing device 10 in the cover assembly 200 has substantially the same technical effects as the sealing device 10 in any of the above embodiments, and will not be described again here since the sealing device 10 has been described in detail in the above embodiments.

[0086] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A sealing device (10), characterized in that, The sealing device (10) is used to seal the electrolyte filling hole (210) of the battery, and the sealing device (10) includes: A sealing base (1) includes a base body (11) and a first connector (12). The base body (11) has a first surface (111) and a second surface (112) opposite to each other along a first direction. The first connector (12) is disposed on the second surface (112). The first connector (12) is used to seal and insert with the injection hole (210). The base body (11) is used to cover the peripheral area of ​​the injection hole (210). The sealing base (1) has a through hole (13) penetrating the base body (11) and the first connector (12). A sealing core (2) is sealed and inserted into the through hole (13) in the direction from the first surface (111) to the second surface (112). The portion of the sealing core (2) located in the through hole (13) and / or the hole wall of the through hole (13) are provided with a first protrusion (221) so that the sealing core (2) and the through hole (13) are interference fit.

2. The sealing device (10) according to claim 1, characterized in that, A first countersunk hole (14) is provided on the first surface (111), and the first countersunk hole (14) is connected to the through hole (13) and is coaxially arranged; The sealed inner core (2) includes an inner core body (21) and a second connector (22) connected to each other. The cross-sectional area of ​​the inner core body (21) is larger than the cross-sectional area of ​​the second connector (22). A portion of the inner core body (21) is embedded in the first countersunk hole (14). The second connector (22) is disposed at one end of the inner core body (21) facing the first connector (12). The second connector (22) is sealed and inserted into the through hole (13). The first protrusion (221) is disposed on the second connector (22).

3. The sealing device (10) according to claim 2, characterized in that, The inner core body (21) is positioned so that one end opposite to the second connector (22) protrudes from the base body (11) along the first direction.

4. The sealing device (10) according to any one of claims 1-3, characterized in that, The sealing base (1) is an elastic sealing base (1), and / or the sealing inner core (2) is an elastic sealing inner core (2).

5. The sealing device (10) according to any one of claims 1-3, characterized in that, A stop (113) is provided on the first surface (111), and the stop (113) is provided around the edge of the base body (11).

6. The sealing device (10) according to any one of claims 1-3, characterized in that, The battery also includes a cover plate (20), the cover plate (20) having a third side (220) and a fourth side (230) arranged opposite to each other, the liquid injection hole (210) is disposed on the cover plate (20) and penetrates the fourth side (230), the third side (220) is provided with a second countersunk hole (240), the second countersunk hole (240) is connected to the liquid injection hole (210) and is coaxially arranged; The first connector (12) includes a first plug section (121) and a second plug section (122) connected to each other along the first direction. The cross-sectional area of ​​the first plug section (121) is larger than the cross-sectional area of ​​the second plug section (122). The first plug section (121) is used to be embedded in the second countersunk hole (240), and the second plug section (122) is used to be sealed and plugged into the injection hole (210).

7. The sealing device (10) according to any one of claims 1-3, characterized in that, The battery also includes a cover plate (20), the cover plate (20) having a third side (220) and a fourth side (230) disposed opposite to each other, the fourth side (230) being disposed facing the inside of the battery, and the liquid injection hole (210) being disposed on the cover plate (20) and penetrating the third side (220) and the fourth side (230); The first connector (12) is provided with a second protrusion (1221), which is used to abut against the fourth surface (230) when the first connector (12) is sealed and inserted into the injection hole (210).

8. The sealing device (10) according to any one of claims 1-3, characterized in that, The outer wall of the first connector (12) is provided with a guide slope (1222), which is used to guide the first connector (12) to be sealed and inserted into the injection hole (210).

9. A cover plate assembly (200), characterized in that, include: A cover plate (20) is provided with the injection hole (210); The sealing device (10) according to any one of claims 1-8, wherein the first plug (12) is sealed and plugged into the injection hole (210), the second surface (112) of the base body (11) abuts against the cover plate (20), and the base body (11) covers the peripheral area of ​​the injection hole (210).

10. A battery (1000), characterized in that, include: A housing (100) having an inner cavity and an opening communicating with the inner cavity; A battery cell (300) is housed within the inner cavity; The cover assembly (200) of claim 9, wherein the cover assembly (200) seals and closes the opening.

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