Liquid injection hole sealing structure and battery

Abstract

The utility model relates to the technical field of batteries, and provides a liquid injection hole sealing structure and a battery. The liquid injection hole sealing structure comprises a sealing piece used for sealing a liquid injection hole, and the sealing piece is integrally connected with a battery part where the liquid injection hole is located. The sealing piece comprises a force application part used for applying external force to break the opening. According to the liquid injection hole sealing structure, the sealing piece and the edge of the liquid injection hole are integrally connected, so that good connection sealing performance between the sealing piece and the edge of the liquid injection hole is guaranteed; in addition, by means of the arrangement of the force application part, the sealing piece can be conveniently broken by means of external force, and secondary liquid injection is achieved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a liquid injection hole sealing structure and a battery. Background Art

[0002] As the public pays more and more attention to the environment, new energy vehicles have developed rapidly. As the core power component of new energy vehicles, power batteries have an important impact on the progress and development of new energy vehicles. Among them, the main problem in the development of power batteries lies in their own safety issues, especially the sealing of the injection holes on the power batteries, which is the key to the safety of power batteries. The sealing of the injection holes affects the overall performance of the power battery. If the injection holes are not sealed properly and leakage occurs, it will have a great adverse effect on the power battery.

[0003] The prior art sealing structure of the injection hole is difficult to balance the sealing stability of the injection hole and the convenience of secondary injection. Utility Model Content

[0004] Based on this, it is necessary to provide a sealing structure for the injection hole, which can ensure the sealing stability at the injection hole and facilitate opening for secondary injection.

[0005] A liquid injection hole sealing structure, comprising:

[0006] The sealing member is used to seal the liquid injection hole of the battery. The sealing member is integrally connected to the battery portion where the liquid injection hole is located. The sealing member includes a force-applying portion for applying external force to break the hole.

[0007] It is understandable that the sealing member and the battery part where the injection hole is located are connected in one piece to ensure good connection and sealing between the two, so as to meet the sealing stability requirements at the injection hole and reduce the risk of leakage. At the same time, the force-applying part on the sealing member is arranged to facilitate the sealing member to be broken open by external force for secondary injection.

[0008] In some of the embodiments, the sealing member and the battery portion where the liquid injection hole is located are integrally stamped, integrally hot-pressed, integrally welded, or integrally fused.

[0009] In some embodiments, the sealing member further includes a connecting portion, the connecting portion is connected to the force-applying portion, and the force-applying portion is integrally connected to a portion of the battery where the liquid injection hole is located through the connecting portion.

[0010] In some embodiments, the force applying portion is protruded from the connecting portion.

[0011] In some embodiments, the injection hole has an axial direction; along the axial direction of the injection hole, the force-applying portion protrudes from the connecting portion toward the outside of the battery, or, along the axial direction of the injection hole, the force-applying portion protrudes from the connecting portion toward the inside of the battery.

[0012] In some embodiments, a cavity is constructed on one side of the force-applying portion along the axial direction of the injection hole; when the force-applying portion protrudes from the connecting portion toward the outside of the battery, the cavity is formed by the side of the sealing member facing the inside of the battery being concave toward the outside of the battery; when the force-applying portion protrudes from the connecting portion toward the inside of the battery, the cavity is formed by the side of the sealing member facing the outside of the battery being concave toward the inside of the battery.

[0013] In some embodiments, the injection hole has an axial direction, and along the axial direction of the injection hole, at least a portion of the force-applying portion is configured as a force-applying portion for cooperating with an external tool;

[0014] The force-applying portion protrudes from the connecting portion toward the outside of the battery, and the outer dimension of the force-applying portion gradually increases from the connecting portion toward the inside of the battery; or, the force-applying portion protrudes from the connecting portion toward the inside of the battery, and the sealing member is configured with a cavity on the side facing the outside of the battery, the cavity is at least partially located at the force-applying portion, and the inner dimension of the force-applying portion having the cavity gradually increases from the connecting portion toward the inside of the battery.

[0015] In some embodiments, the force-applying portion is configured with a connecting hole, the opening of the connecting hole is arranged toward the outside of the battery, and the hole wall of the connecting hole is configured with a threaded structure.

[0016] In some embodiments, along the axial direction of the liquid injection hole, the projected outer dimension of the force-applying portion is smaller than the aperture of the liquid injection hole.

[0017] In some embodiments, the sealing member further includes a connecting portion and a weak portion; the connecting portion is connected to and arranged in an annular manner on the force-applying portion, and the connecting portion is integrally connected to a portion of the battery where the injection hole is located; the weak portion is arranged on the connecting portion or the force-applying portion, or, is arranged at the intersection of the connecting portion and the force-applying portion, or, both the connecting portion and the force-applying portion are provided with the weak portion; the weak portion is configured to break open in response to an external force applied to the force-applying portion.

[0018] In some embodiments, the weak portion is arranged around the location.

[0019] In some embodiments, the injection hole has an axial direction, and along the axial direction of the injection hole, at least a portion of the force-applying portion is configured with a force-applying portion; along the direction from the connecting portion toward the force-applying portion, the weak portion is arranged upstream of the force-applying portion.

[0020] In some embodiments, the portion of the sealing member that is removed after the weak portion is broken is a removal portion; the force-applying portion protrudes from the connecting portion on a side facing the inside of the battery, and / or the sealing member is integrally connected to a side of the battery portion where the injection hole is located facing the inside of the battery; the maximum outer dimension of the removal portion along the radial direction of the injection hole is less than or equal to the aperture diameter of the injection hole.

[0021] In some of these embodiments, the weakened portion is configured as a groove, a tear line, or a score.

[0022] In some embodiments, the injection hole has an axial direction, and a sink is constructed at the battery portion where at least one end of the injection hole along its axial direction is located, and a portion of the sealing member is accommodated in the sink.

[0023] In some embodiments, the liquid injection hole sealing structure further includes a sealing cover, and the sealing cover is disposed on a side of the sealing member facing the inside of the battery.

[0024] In some embodiments, the sealing cover is connected to the side of the battery portion where the injection hole is located facing the inside of the battery; or, the portion of the battery portion where the injection hole is located after the sealing member is broken is a residual portion, and the sealing cover is connected to the residual portion, and the sealing cover is used to cover the broken portion of the sealing member.

[0025] In some embodiments, the portion to which the sealing cover is connected and the sealing cover, one of which is provided with a slot, and the other is provided with a protrusion for snapping into the slot; and / or the sealing cover is bonded to the portion to which the sealing cover is connected.

[0026] In some embodiments, a first step is provided at a portion where the sealing cover is connected, the first step is recessed along the sealing cover toward the outside of the battery, and the sealing cover is disposed on the first step;

[0027] The first step is recessed from the bottom surface of the portion to which the sealing cover is connected toward the outside of the battery; or, a second step is provided on the bottom surface of the portion to which the sealing cover is connected, the second step is protruded along the sealing cover toward the inside of the battery, and the first step is recessed from the protruding end surface of the second step toward the outside of the battery; both the first step and the second step surround the injection hole, and the second step surrounds the first step.

[0028] In some embodiments, the liquid injection hole sealing structure further includes a protective sheet, and the protective sheet is covered on a side of the sealing member facing outside the battery.

[0029] In some embodiments, the protective sheet is connected to the battery portion where the injection hole is located;

[0030] From the injection hole toward the outside of the battery, when the downstream side of the sealing member is located downstream of the battery portion where the injection hole is located, a third step is provided downstream of the battery portion where the injection hole is located, and the third step is protruded around the injection hole toward the outside of the battery, the downstream side of the third step is located downstream of the sealing member, and the protective sheet is provided on the third step.

[0031] In some embodiments, the liquid injection hole sealing structure further includes a release sheet, and the release sheet is disposed between the sealing cover and the sealing member.

[0032] The present application also provides a battery, comprising a battery shell and a cover plate connected to the battery shell, wherein the battery shell and / or the cover plate are provided with a liquid injection hole, and the above-mentioned liquid injection hole sealing structure is installed at the liquid injection hole.

[0033] In some embodiments, at least two injection holes are provided, and the injection hole sealing structure is installed at at least one of the injection holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0035] Figure 1 A cross-sectional view of a liquid injection hole sealing structure provided in an embodiment of the present application, located at the liquid injection hole;

[0036] Figure 2 A cross-sectional view of a liquid injection hole sealing structure provided by another embodiment of the present application, located at the liquid injection hole;

[0037] Figure 3 A cross-sectional view of a liquid injection hole sealing structure provided by another embodiment of the present application;

[0038] Figure 4 for Figure 3 A top view schematic diagram of a sealing structure of a liquid injection hole;

[0039] Figure 5 for Figure 3 A bottom view schematic diagram of the sealing structure of the injection hole;

[0040] Figure 6 A cross-sectional view of a liquid injection hole sealing structure provided by another embodiment of the present application;

[0041] Figure 7 for Figure 6Top view schematic diagram of the liquid injection hole sealing structure;

[0042] Figure 8 For Figure 6 Bottom view schematic diagram of the liquid injection hole sealing structure;

[0043] Fig. 9 Cross-sectional view of the liquid injection hole sealing structure provided by another embodiment of the present application;

[0044] Fig.10 Cross-sectional view of the liquid injection hole sealing structure provided by another embodiment of the present application;

[0045] Fig.11 Cross-sectional view of the liquid injection hole sealing structure provided by another embodiment of the present application;

[0046] Fig.12 Cross-sectional view of the liquid injection hole sealing structure provided by another embodiment of the present application located at the liquid injection hole;

[0047] Fig.13 Cross-sectional view of the liquid injection hole sealing structure provided by another embodiment of the present application located at the liquid injection hole;

[0048] Fig.14 Cross-sectional view of the liquid injection hole sealing structure provided by another embodiment of the present application located at the liquid injection hole;

[0049] Fig.15 For Fig.14 Schematic diagram of the liquid injection hole sealing structure assembling external tools;

[0050] Fig.16 For Fig.15 Partial enlarged view of part A in;

[0051] Fig.17 For Fig.15 Schematic diagram of the liquid injection hole sealing structure provided after being broken by an external tool;

[0052] Fig.18 Cross-sectional view of the liquid injection hole sealing structure provided by another embodiment of the present application located at the liquid injection hole;

[0053] Fig.19 Cross-sectional view of the liquid injection hole sealing structure provided by another embodiment of the present application located at the liquid injection hole;

[0054] Fig. 20 Cross-sectional view of the liquid injection hole sealing structure provided by another embodiment of the present application located at the liquid injection hole;

[0055] Fig.21 Cross-sectional view of the liquid injection hole sealing structure provided by another embodiment of the present application located at the liquid injection hole;

[0056] Fig. 22A cross-sectional view of a liquid injection hole sealing structure provided by another embodiment of the present application, located at the liquid injection hole;

[0057] Fig.23 A cross-sectional view of a liquid injection hole sealing structure provided by another embodiment of the present application, located at the liquid injection hole;

[0058] Fig.24 A cross-sectional view of a liquid injection hole sealing structure provided by another embodiment of the present application, located at the liquid injection hole;

[0059] Fig.25 A cross-sectional view of a liquid injection hole sealing structure provided by another embodiment of the present application, located at the liquid injection hole;

[0060] Fig.26 A cross-sectional view of a liquid injection hole sealing structure provided by another embodiment of the present application, located at the liquid injection hole;

[0061] Fig. 27 A cross-sectional view of a sealing structure for a liquid injection hole provided in another embodiment of the present application, after the sealing structure is breached, and then sealed again with a sealing sheet;

[0062] Fig.28 A cross-sectional view of a sealing structure for a liquid injection hole provided in another embodiment of the present application, which is sealed again with a plugging member after the sealing structure is breached;

[0063] Fig.29 A schematic diagram of the cooperation between the sealing structure of the liquid injection hole and the cover plate provided in one embodiment of the present application.

[0064] Reference numerals: 10, sealing member; 11, force-applying portion; 12, connecting portion; 13, weak portion; 20, sealing cover; 30, anti-adhesive sheet; 40, protective sheet; 100, injection hole sealing structure; 101, fillet; 111, force-applying portion; 112, cavity; 114, connecting hole; 115, transition portion; 131, V-shaped groove; 200, injection hole; 201, sink; 300, cover plate; 301, first step; 302, second step; 303, third step; 304, annular groove; 30 5. convex ring; 410. sealing sheet; 420. sealing piece; 430. sealing ring; 500. expansion tool; 601. slot; 602. convex part; 1001. opening; 1002. removal part; 1003. residual part; 1101. outer wall; 1102. top wall; 1103. frustum section; 1104. cylindrical section; 1121. cavity bottom wall; 1122. cavity side wall; 2011. first sinker; 2012. second sinker; 3001. inner side of cover plate; 3002. outer side of cover plate. DETAILED DESCRIPTION

[0065] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0066] It should be noted that when a component is referred to as being "fixed to" or "disposed on" another component, it may be directly on the other component or there may also be a central component. When a component is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central component at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in the specification of this application are for illustrative purposes only and do not represent the only implementation method.

[0067] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first feature is directly in contact with the second feature, or the first feature and the second feature are indirectly in contact through an intermediate medium. Moreover, a first feature being “above”, “above” or “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below” or “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0069] Unless otherwise defined, all technical and scientific terms used in the specification of this application have the same meaning as those commonly understood by technicians in the technical field of this application. The terms used in the specification of this application are only for the purpose of describing specific implementation methods and are not intended to limit this application. The term "and / or" used in the specification of this application includes any and all combinations of one or more related listed items.

[0070] In power batteries, the sealing of the injection hole is crucial to the safety of the power battery itself. It not only affects the overall performance of the power battery during use, but also has an adverse effect on the power battery if the injection hole is not sealed properly or leakage occurs, and the safety risk will be greatly increased. In the related art, the structure used for sealing the injection hole is difficult to take into account both the sealing stability of the injection hole and the convenience of secondary injection.

[0071] In view of this, an embodiment of the present application provides a liquid injection hole sealing structure, which can ensure the sealing stability at the liquid injection hole and is easy to open for secondary liquid injection, thereby reducing the sealing and opening processes and making the operation more convenient. The liquid injection hole sealing structure is described in detail below.

[0072] See also Figures 1 to 3 As shown, in some embodiments, the injection hole sealing structure 100 includes a sealing member 10 for sealing at the injection hole 200 of the battery, and the sealing member 10 is integrally connected to the battery part where the injection hole 200 is located. The sealing member 10 includes a force-applying portion 11 for applying an external force to break. It should be noted that the injection hole 200 is a structure for injecting liquid on the battery, which can be set on the cover plate 300 of the battery or on the battery shell (not shown in the figure). Therefore, the battery part where the injection hole 200 is located refers to the cover plate 300 or the battery shell. The battery has a battery cavity for accommodating electrolyte, and the injection hole 200 is set through the cover plate 300 or the battery shell to connect the battery cavity, and the electrolyte can be filled into the battery cavity through the injection hole 200. In the following, taking the injection hole 200 set on the cover plate 300 as an example, the battery part where the injection hole 200 is located is the cover plate 300.

[0073] It is understandable that the sealing member 10 and the cover plate 300 are connected as one body to ensure good connection and sealing between the two, meet the sealing requirements at the injection hole 200, and reduce the risk of leakage. At the same time, due to the setting of the force-applying portion 11, which is equivalent to providing an area on the sealing member 10 for external tools to apply force, it is convenient for external tools to cooperate with the force-applying portion 11 of the sealing member 10, and then use external force to cause the sealing member 10 to break open for secondary injection; and, precisely because the sealing member 10 is connected as one body with the cover plate 300, both the initial sealing and the secondary injection of the opening can be completed in a single operation, which is simpler and more convenient to operate, and reduces the sealing and opening process. Among them, when the injection hole 200 is set in the battery shell, the sealing member 10 is connected as one body with the battery shell.

[0074] It is worth noting that the above-mentioned integrated connection refers to integrated processing and forming, which is a fixed connection method. Compared with the split connection (such as detachable connection), the integrated connection does not require a gap for connection and matching, so the sealing performance is better and the operation is more convenient and quick.

[0075] Please continue reading Figure 2 In some embodiments, the sealing member 10 and the cover plate 300 are integrally formed, such as integrally stamped, integrally hot-pressed, etc. At this time, the cover plate 300 can be covered at the opening of the battery shell after the liquid is injected, and the battery is packaged. Figure 1 As shown, alternatively, when the cover plate 300 and the sealing member 10 are both made of metal, the sealing member 10 and the cover plate 300 are welded together. Another alternative is that the sealing member 10 and the cover plate 300 are welded together, and the sealing member 10 can be made of plastic, resin, etc.

[0076] like Figures 3 to 5 As shown, optionally, the force-applying portion 11 may be a solid structure to ensure higher strength and a more secure connection with an external tool.

[0077] like Figure 2 and Fig. 9 As shown, another alternative is that the force-applying part 11 can be constructed with a connecting hole 114, and the opening of the connecting hole 114 is set toward the outside of the battery, so that an external tool can be connected to the hole wall of the connecting hole 114 to drive the force-applying part 11 to break the sealing member 10. Specifically, a threaded structure can be constructed on the hole wall of the connecting hole 114 to make it a threaded hole, so that it is convenient to connect the force-applying part 11 with a screw or a screw to perform a breaking operation. Alternatively, a first protrusion (not shown in the figure) can be set on the hole wall of the connecting hole 114, and an external tool with a first groove can be inserted into the connecting hole 114, and the connection between the external tool and the force-applying part 11 is achieved by the first protrusion and the first groove snap-fitting.

[0078] like Figure 3 As shown, in actual use, when the force-applying portion 11 protrudes toward the outside of the battery, an external tool can be clamped on the outside of the force-applying portion 11 and pull the force-applying portion 11 toward the outside of the battery to break the sealing member 10; at this time, the solid force-applying portion 11 is more conducive to receiving the clamping effect applied by the external tool to ensure clamping stability.

[0079] See also Figure 1 and Figure 2 In an optional embodiment, the sealing member 10 further includes a connecting portion 12 , the connecting portion 12 is connected to the force applying portion 11 , and the force applying portion 11 is integrally connected to the cover plate 300 via the connecting portion 12 .

[0080] That is to say, the connection part 12 is provided to ensure the integral connection of the sealing member 10 with respect to the cover plate 300, and to facilitate the distinction between the connection part of the sealing member 10 and the force-applying part of the sealing member 10, which not only meets the sealing requirements, but also avoids interference or damage to the edge or hole wall of the injection hole 200 when the hole is broken. The force-applying part 11 is connected to the connection part 12 along its circumference, so as to fully ensure the reliable connection between the sealing member 10 and the cover plate 300, and the sealing effect is better.

[0081] like Figures 6 to 21 As shown, in some specific embodiments, the connection portion 12 is arranged in a ring on the outer peripheral side of the force-applying portion 11. That is, the connection portion 12 is arranged in a ring-shaped structure, and is sleeved on the outer side of the force-applying portion 11, and is formed integrally with the force-applying portion 11. In this way, it can be ensured that the force-applying portion 11 is connected to the connection portion 12 along its own circumference, ensuring good sealing. At this time, the force-applying portion 11 not only serves as a force-applying point for an external tool, but is also used to block the injection hole 200. Alternatively, the connection portion 12 is arranged in a plate-shaped structure (such as Figure 5 ), the force-applying portion 11 is connected to the side of the connecting portion 12 facing the outside of the battery. At this time, the connecting portion 12 is not only used to be integrally connected to the battery portion where the injection hole 200 is located, but also can block the injection hole 200, and the force-applying portion 11 only serves as a force-applying area for cooperating with external tools.

[0082] In some other specific embodiments, the force-applying portion 11 and the connecting portion 12 are integrally formed to improve the structural strength of the sealing member 10, ensure the sealing performance, simplify the production process, and reduce the cost. For example, the force-applying portion 11 and the connecting portion 12 are integrally stamped or integrally hot-pressed, etc.

[0083] like Figure 1 , Figure 2 as well as Figures 12 to 21 As shown, further, the injection hole 200 has an axial direction X. Along the axial direction X of the injection hole 200 , the projected outer edge of the injection hole 200 falls within the projected outer edge of the connecting portion 12 .

[0084] like Figure 1 , Figures 12 to 21 As shown, when the connection part 12 and the cover plate 300 are integrally welded or integrally fused, along the axial direction X of the injection hole 200, the projected outer edge of the connection part 12 is outside the projected outer edge of the injection hole 200, so as to ensure that the connection part 12 and the cover plate 300 have sufficient matching area and sealing area, which not only ensures the connection reliability, but also guarantees the sealing. Figure 2As shown, when the connection portion 12 and the cover plate 300 are integrally stamped or integrally hot-pressed, the projected outer edge of the injection hole 200 coincides with the projected outer edge of the connection portion 12. In other words, when the projected outer edge of the injection hole 200 falls within the projected outer edge of the connection portion 12, it includes two situations: the projected outer edges of the two coincide with each other, and the projected outer edge of the connection portion 12 is outside the projected outer edge of the injection hole 200.

[0085] Please continue reading Figures 1 to 26 For example, the force-applying portion 11 is convexly disposed on the connecting portion 12 to ensure sufficient force-applying space, making it easier to use an external tool to act on the force-applying portion 11 to open the sealing member 10 for secondary liquid injection. Figure 6 and Figure 7 As shown, a rounded corner 101 is provided at the intersection of the force-applying portion 11 and the connecting portion 12 to reduce stress concentration.

[0086] like Figure 1 , Figure 3 , Figure 4 , Figure 6 , Figure 7 , Figures 9 to 13 as well as Fig.19 As shown, specifically, along the axial direction X of the injection hole 200, the force-applying portion 11 is protruded from the connecting portion 12 toward the side outside the battery. Such a configuration is more convenient for external tools to operate, especially when the sealing member 10 is installed on the side of the cover plate 300 facing the outside of the battery (hereinafter referred to as the outer side 3002 of the cover plate), the force-applying portion 11 is in a protruding state toward the outside of the battery relative to the cover plate 300, which can reduce the interference of the injection hole 200 with the external tools.

[0087] like Figure 2 , Figures 14 to 18 , Fig. 20 and Fig.21 As shown, alternatively, along the axial direction X of the injection hole 200, the force-applying portion 11 is protruded from the connecting portion 12 toward the side of the battery. At this time, when the sealing member 10 is integrally connected to the side of the cover plate 300 facing the battery (hereinafter referred to as the inner side 3001 of the cover plate), the force-applying portion 11 does not protrude out of the battery, thereby avoiding interference with other structures, collisions, and damage to the seal of the sealing member 10, thereby improving protection.

[0088] Please continue to combine Figure 1 , Figures 12 to 15 as well as Figures 17 to 21As shown, in some of the embodiments, a sink 201 is constructed at the battery portion where at least one end of the injection hole 200 along its own axial direction X is located, that is: the cover plate 300 is constructed with a sink 201 along at least one side of the axial direction X of the injection hole 200. Part of the sealing member 10 is accommodated in the sink 201. The provision of the sink 201 facilitates the accommodation of the connecting portion 12 in the sealing member 10, and facilitates the positioning, installation and connection of the connecting portion 12. Furthermore, along the axial direction X of the injection hole 200, the depth of the sink 201 is not less than (that is, greater than or equal to) the thickness of the connecting portion 12, ensuring that the connecting portion 12 does not protrude, avoiding the connecting portion 12 from protruding toward the outside of the battery relative to the cover plate 300 and being easily bumped, resulting in damage to the connection reliability, or avoiding the connecting portion 12 from protruding toward the inside of the battery relative to the cover plate 300, which increases the difficulty of assembly and reduces the energy density of the battery.

[0089] Furthermore, the corresponding diameter of the sink 201 is larger than the aperture of the injection hole 200 , which not only ensures that the outer diameter of the connecting portion 12 is larger than the aperture of the injection hole 200 as required, but also satisfies the protection of the connecting portion 12 .

[0090] Specifically, take the case where the cover plate 300 is constructed with a sink 201 on both sides of the axial direction X of the injection hole 200. The outer side 3002 of the cover plate is constructed with a first sink 2011, and the inner side 3001 of the cover plate is constructed with a second sink 2012. At this time, the sealing member 10 can be selectively connected to the first sink 2011 and the second sink 2012, that is: the connecting portion 12 can be accommodated in the first sink 2011 and connected integrally with the cover plate 300; or the connecting portion 12 can be accommodated in the second sink 2012 and connected integrally with the cover plate 300. When accommodated in the second sink 2012, the first sink 2011 can also be used for the assembly of the sealing structure after the secondary injection.

[0091] When the sealing member 10 is installed on the first sinking platform 2011 through the connecting portion 12, the force applying portion 11 can be protruded from the connecting portion 12 toward the outside of the battery, or can be protruded from the connecting portion 12 toward the inside of the battery. The assembly method of the sealing member 10 on the second sinking platform 2012 is basically similar to the first sinking platform 2011, so it will not be repeated.

[0092] like Figure 1 , Figures 6 to 11 ,as well as Figures 14 to 21 As shown, in an optional embodiment, along the axial direction X of the liquid injection hole 200 , a cavity 112 is configured on one side of the force applying portion 11 .

[0093] When the force-applying portion 11 is convex from the connecting portion 12 toward the outside of the battery, the cavity 112 is concavely formed by the side of the sealing member 10 facing the inside of the battery (hereinafter referred to as the inner side of the sealing member) toward the outside of the battery. In this way, the cavity 112 is directed toward the inside of the battery, so that the force-applying portion 11 has a hollow structure, which is beneficial for achieving a lightweight design, saving materials, and reducing costs. In some specific embodiments, a connecting hole 114 (such as 114) can be concavely formed toward the inside of the battery along the axial direction X of the injection hole 200 on the side of the force-applying portion 11 facing the outside of the battery. Fig. 9 ).

[0094] When the force-applying part 11 is convex from the connecting part 12 toward the inside of the battery, the cavity 112 is formed by the side of the sealing member 10 facing the outside of the battery (hereinafter referred to as the outside of the sealing member) being concave toward the inside of the battery, that is, the opening of the cavity 112 faces the outside of the battery. At this time, the arrangement of the cavity 112 facilitates the use of an expandable external tool (expansion tool 500) to insert and abut against the side wall of the cavity 112, and then apply a pulling force toward the outside of the battery to break the sealing member 10; and, because the force-applying part 11 can be tightened on the expansion tool 500 by using the cavity 112, it is also prevented from falling.

[0095] Please combine Figures 12 to 18 For example, along the axial direction X of the injection hole 200, at least a portion of the force-applying portion 11 is constructed with a force-applying portion 111 for cooperating with an external tool, thereby improving the connection reliability between the force-applying portion 11 and the external tool and preventing the external tool from slipping and separating from the force-applying portion 11 during the external pulling of the force-applying portion 111.

[0096] like Fig.12 As shown, the force-applying portion 11 is convex from the connecting portion 12 toward the outside of the battery; and the outer dimension of the force-applying portion 111 gradually increases from the connecting portion 12 toward the outside of the battery. When the force-applying portion 11 is arranged in a solid structure, the force-applying portion 11 includes a top wall 1102 and an outer side wall 1101, which are connected and arranged at an acute angle, and the top wall 1102 is parallel or tends to be parallel to the connecting portion 12, so that the force-applying portion 11 is in the shape of an inverted truncated cone. That is, the diameter of the force-applying portion 11 gradually increases from the connecting portion 12 toward the outside of the battery. At this time, a force-applying portion 111 is formed on the force-applying portion 11 at the outer side wall 1101, which is convenient for abutting and limiting with an external tool. When the external tool is clamped in the middle of the force-applying portion 11 and pulled toward the outside of the battery, the position with a larger diameter on the force-applying portion 11 abuts against the external tool, and the external tool is prevented from being separated from the force-applying portion 11 as much as possible. Among them, the outer dimension of the force-applying portion 111 is the dimension defined by the outer side wall of the force-applying portion 11.

[0097] like Fig.13As shown, alternatively, the force-applying portion 11 may include an inverted truncated cone segment 1103 and a cylindrical segment 1104 connected to the truncated cone segment 1103, one end of the truncated cone segment 1103 that is away from the cylindrical segment 1104 is connected to the connecting portion 12, the diameter of the truncated cone segment 1103 gradually increases from the connecting portion 12 toward the outside of the battery, and the diameter of the cylindrical segment 1104 is less than or equal to the maximum diameter of the truncated cone segment 1103. In this case, the truncated cone segment 1103 can serve as the force-applying portion 111.

[0098] like Figures 14 to 17 As shown, as another exemplary example, take the expansion tool 500 tightening the force-applying part 11 to make a rupture as an example. At this time, the force-applying part 11 is convex from the connecting part 12 toward the inside of the battery, and a cavity 112 is configured on the side of the force-applying part 11 facing the outside of the battery, and the cavity 112 is concave from the outside of the sealing member along the axial direction X of the injection hole 200 toward the inside of the battery. The cavity 112 is at least partially located at the force-applying part 111; and, from the connecting part 12 toward the inside of the battery, the inner dimension of the force-applying part 111 having the cavity 112 gradually increases. Specifically, the cavity 112 has a cavity bottom wall 1121 and a cavity side wall 1122, which are at an acute angle, and the cavity bottom wall 1121 is parallel or tends to be parallel to the connecting part 12. At this time, a force-applying portion 111 is formed on the force-applying portion 11 at the position of the cavity side wall 1122, so that the inner diameter of the force-applying portion 111 gradually increases along the direction of the connecting portion 12 toward the inside of the battery, so as to facilitate the abutment and limiting of the expansion tool 500, and to avoid the expansion tool 500 from being separated from the force-applying portion 11 as much as possible. At this time, the force-applying portion 111 can be pulled toward the outside of the battery to break it open. Among them, the inner size of the force-applying portion 111 is the size defined by the cavity side wall 1122 of the cavity 112.

[0099] like Fig.18 As shown, alternatively, the cavity 112 may also include a frustum segment 1103 and a cylindrical segment 1104, and the configuration is similar to that described above and will not be repeated here.

[0100] like Fig.16 As shown, the portion of the force-applying portion 11 between the force-applying portion 111 and the connecting portion 12 is used as a transition portion 115, and the transition portion 115 and the connecting portion 12 are at an angle of 90 degrees to reduce the stress concentration at the intersection between the force-applying portion 11 and the connecting portion 12. If the force-applying portion 111 is directly connected to the connecting portion 12, the force-applying portion 111 and the connecting portion 12 are at an acute angle due to the size setting of the force-applying portion 111, and the stress concentration problem will be aggravated. Therefore, the above-mentioned transition portion 115 is needed to alleviate it.

[0101] Please combine Figures 1 to 17As shown, optionally, along the axial direction X of the injection hole 200, the projection of the force-applying portion 11 falls within the projection of the injection hole 200. That is, the maximum outer dimension of the force-applying portion 11 is smaller than the aperture of the injection hole 200. With such a configuration, when the force-applying portion 11 is located inside the battery, a gap remains between the outer side wall 1101 of the force-applying portion 11 and the hole wall of the injection hole 200, that is, the force-applying portion 11 does not contact the hole wall of the injection hole 200. At this time, when the force-applying portion 11 moves toward the outside of the battery under the action of an external tool, it will not interfere with the hole wall, thereby reducing the rupture obstacle and making the rupture operation more convenient.

[0102] like Figures 1 to 21 As shown, in an optional embodiment, the sealing member 10 further includes a weak portion 13, which is disposed on the connecting portion 12 and / or the force-applying portion 11, and is configured to break in response to an external force applied to the force-applying portion 11. In other words, by using the arrangement of the weak portion 13, it is easier to use an external tool to act on the force-applying portion 11 to break the sealing member 10. The weak portion 13 refers to a portion of the sealing member 10 that reduces the strength of the connecting portion 12 or the force-applying portion 11, so that it is easier to break from the weak portion 13 under the action of an external force, thereby realizing the opening of the injection hole 200 for secondary injection.

[0103] like Figure 3 , Figure 6 and Fig.16 As shown, in some specific embodiments, a portion of the sealing member 10 may be thinned to reduce the thickness and form a weak portion 13. The weak portion 13 may be a V-shaped groove 131 provided on the sealing member 10, or, of course, a square groove, a trapezoidal groove, etc. Alternatively, the weak portion 13 may be a tear line or a notch provided on the sealing member 10. The weak portion 13 does not penetrate the sealing member 10 to ensure that the sealing member 10 itself has good sealing performance. It is sufficient to ensure that the structural strength at the weak portion 13 is low so that it is easy to break under the action of external force.

[0104] like Fig.10 As shown, the weak portion 13 is disposed on the force-applying portion 11. At this time, the weak portion 13 is located in the middle of the force-applying portion 11 or near the connecting portion 12, so as to reserve a sufficient contact area for cooperating with an external tool at the end of the force-applying portion 11 away from the connecting portion 12. Figure 3 and Figure 6 As shown, alternatively, the weak portion 13 is arranged at the connecting portion 12. In this case, the weak portion 13 is arranged close to the force-applying portion 11, so as to reduce the force arm of the external tool to transmit the force to the weak portion 13 through the force-applying portion 11 as much as possible, making it easier to break at the weak portion 13. Fig.11As shown, another alternative is that the weak portion 13 is arranged at the intersection of the connecting portion 12 and the force-applying portion 11. It is understandable that, since the force-applying portion 11 is convex compared to the connecting portion 12, there will be a stress concentration problem at the intersection of the two, and the strength is slightly affected. Therefore, arranging the weak portion 13 here is more convenient for the breaking operation and reduces the wear of the hole wall of the injection hole caused by tearing the connecting portion 12 during breaking.

[0105] Alternatively, both the connecting portion 12 and the force-applying portion 11 may be provided with a weak portion 13. In this case, the two weak portions 13 are provided close to each other.

[0106] like Figures 1 to 4 , Figure 6 and Figure 7 , Figures 9 to 21 As shown, as one exemplary embodiment, the weak portion 13 is arranged in a ring at the location (connecting portion 12, force applying portion 11 and / or the intersection of the connecting portion 12 and the force applying portion 11). That is, the weak portion 13 is arranged in a ring shape and is arranged in a ring along the circumference of the location. Such an arrangement ensures that the location where the weak portion 13 is located has a broken area along its own circumference, which saves effort. When the location where the weak portion 13 is located is arranged in a cylindrical shape, the weak portion 13 can be in a ring shape.

[0107] Alternatively, the weak portion 13 may be strip-shaped, in which case a plurality of weak portions 13 are required to be arranged at intervals along the circumference of the part, especially at even intervals. If the part is cylindrical, each weak portion 13 may be arc-shaped; if the part is prismatic, each weak portion 13 may be straight strip-shaped.

[0108] Please combine Figures 14 to 17 As shown, optionally, the diameter of the weak portion 13 is not greater than (i.e., less than or equal to) the diameter of the injection hole 200. Thus, it is prevented that the portion of the sealing member 10 that has been separated from the battery after the break cannot be removed from the injection hole 200. Figures 14 to 16 As shown, it is worth noting that when the weak portion 13 is formed by the V-shaped groove 131, the diameter of the so-called weak portion 13 is based on the circle corresponding to the turning point of the V-shape.

[0109] Please combine Figures 12 to 18 Alternatively, along the direction from the connection portion 12 to the force-applying portion 111, the weak portion 13 is disposed upstream of the force-applying portion 111. The force-applying portion 111 is used to cooperate with an external tool. If the weak portion 13 is located downstream of the force-applying portion 111, even if the external tool acts on the force-applying portion 111 and pulls, no pulling force will be generated on the weak portion 13. Therefore, the weak portion 13 needs to be located upstream of the force-applying portion 111 so that the pulling force applied by the external tool can be transmitted to the weak portion 13, which is conducive to the rupture.

[0110] Among them, the portion of the sealing member 10 removed after the break at the weak portion 13 is the removal portion 1002, and the portion still connected to the cover plate 300 after the break is the remaining portion 1003. When the force-applying portion 11 is protruded from the side of the connecting portion 12 toward the inside of the battery, and / or the sealing member 10 is integrally connected to the side of the battery where the injection hole 200 is located and faces the inside of the battery, the maximum outer dimension of the removal portion 1002 along the radial direction of the injection hole 200 is not greater than (less than or equal to) the aperture of the injection hole 200. When the sealing member 10 is broken from the weak portion 13, an opening 1001 with the diameter of the weak portion 13 as the diameter is formed. Since the maximum outer dimension of the removal portion 1002 along the radial direction of the injection hole 200 is not greater than (less than or equal to) the aperture of the injection hole 200, it is convenient to take out the removal portion 1002 from the injection hole 200 after the break to avoid falling into the battery.

[0111] like Figure 22 to Figure 26 As shown, in an optional embodiment, the injection hole sealing structure also includes a sealing cover 20, and the sealing cover 20 is covered on the side of the sealing member 10 facing the inside of the battery. The setting of the sealing cover 20 is used to prevent external impurities, water and other substances from falling into the electrolyte during the secondary injection. Specifically, when the sealing member 10 is broken for secondary injection, the sealing cover 20 can be punctured by a puncture needle, and the sealing cover 20 and the outer wall of the puncture needle for injection are squeezed and sealed. Among them, the sealing cover 20 can be made of materials such as silicone, rubber or silicone rubber. When the puncture needle is withdrawn, the sealing cover 20 can be restored to block due to its own deformation characteristics. Therefore, the setting of the sealing cover 20 further strengthens the sealing of the injection hole 200.

[0112] like Fig. 22 and Fig.23 As shown, further, the sealing cover 20 is connected to the side of the cover plate 300 facing the inside of the battery. For example, the sealing cover 20 can be bonded to the inner side 3001 of the cover plate. Of course, one of the inner side 3001 of the cover plate and the sealing cover 20 can be provided with a card slot 601, and the other can be provided with a convex portion 602 that is inserted into the card slot 601, and the assembly is achieved by the snap-fitting of the convex portion 602 and the card slot 601. Taking the convex portion 602 provided on the sealing cover 20 as an example, the convex portion 602 can be convexly provided on the sealing cover 20 along the axial direction X of the injection hole 200 toward the outside of the battery, and the card slot 601 is concavely provided on the inner side 3001 of the cover plate toward the outside of the battery to achieve the assembly of the sealing cover 20. Among them, the card slot 601 and the convex portion 602 are both provided in an annular structure to ensure the reliability of the connection.

[0113] In actual use, when the cover plate 300 is stamped and formed, and an annular groove 601 is recessed on the inner side 3001 of the cover plate, a convex ring 305 convex toward the outside of the battery is formed at a position corresponding to the groove 601 on the outer side 3002 of the cover plate.

[0114] Alternatively, the sealing cover 20 may be connected to the portion of the sealing member 10 that is still connected to the cover plate 300 after it is broken, that is, connected to the remaining portion 1003. In this case, the remaining portion 1003 of the sealing member 10 and the sealing cover 20 may also be embedded and assembled by using the matching of the card slot 601 and the protrusion 602.

[0115] Specifically, while the embedding and assembly of the card slot 601 and the protrusion 602 are completed, the sealing cover 20 can also be bonded to the position where it is located to improve the connection stability.

[0116] like Figure 24 to Figure 27 As shown, in some embodiments, the inner side 3001 of the cover plate is recessed with a first step 301 along the direction of the sealing cover 20 toward the outside of the battery, and the sealing cover 20 is arranged on the first step 301 to improve the assembly reliability of the sealing cover 20. When the sealing cover 20 is connected to the remaining part 1003, the side wall of the remaining part 1003 facing the inside of the battery can be recessed with the first step toward the outside of the battery to achieve the assembly of the sealing cover 20 and the remaining part 1003.

[0117] In some specific embodiments, when the first depressed platform 2011 and the second depressed platform 2012 are respectively provided on both sides of the cover plate 300 along the axial direction X of the injection hole 200, if the sealing member 10 is installed at the first depressed platform 2011, the second depressed platform 2012 can be used as the first step 301 here for assembling the sealing cover 20. Alternatively, when the sealing member 10 is installed at the second depressed platform 2012, the side wall of the inner side 3001 of the cover plate is recessed with the first step 301 toward the outside of the battery, and the first step 301 is recessed with the second depressed platform 2012 toward the outside of the battery.

[0118] like Fig.25 As shown, in another embodiment, the inner side 3001 of the cover plate is provided with a second step 302 protruding along the direction of the sealing cover 20 toward the inside of the battery, and the end surface of the second step 302 protruding into the battery is the protruding end surface, and the first step 301 is arranged from the protruding end surface of the second step 302 to the outside of the battery; the first step 301 and the second step 302 both surround the injection hole 200, and the second step 302 surrounds the first step 301. The sealing cover 20 is accommodated in the first step 301, and the sealing cover 20 is bonded and fixed to the cover plate 300. With such a setting, when the sealing member 10 is installed on the second sink 2012 on the inner side 3001 of the cover plate, the setting of the second step 302 can avoid the problem that the battery part where the injection hole 200 is located is too thin and the second sink 2012 and the first step 301 arranged along the axial direction X of the injection hole 200 cannot be set at the same time.

[0119] Specifically, when the second step 302 is integrally formed by stamping the cover plate 300 , a ring groove 304 concave toward the inside of the battery is correspondingly formed on the outer side 3002 of the cover plate.

[0120] like Fig.17 and 26 As shown, the injection hole sealing structure further includes an anti-adhesive sheet 30, which is disposed between the sealing cover 20 and the sealing member 10. The anti-adhesive sheet 30 can prevent the adhesive from leaking to the removal part 1002 when the sealing cover 20 is bonded to the cover plate 300 or the residual part 1003, thereby affecting the opening operation. The diameter of the anti-adhesive sheet 30 is greater than the maximum outer diameter of the removal part 1002 to ensure a sufficient protection range.

[0121] See also Figure 23 to Figure 26 Optionally, the injection hole sealing structure further includes a protective sheet 40, which is disposed on the side of the sealing member 10 facing the outside of the battery. The provision of the protective sheet 40 can protect the sealing member 10, prevent the sealing member 10 from being damaged by external forces when secondary injection is not required, and further ensure the sealing stability.

[0122] When the connecting portion 12 is completely located in the first depressed portion 2011 and the force applying portion 11 is convex toward the inside of the battery, the protection sheet 40 can be pressed onto the outer side 3002 of the cover plate and cover the first depressed portion 2011 .

[0123] like Fig.23 As shown, the protection sheet 40 may be located within the convex ring 305 , and the convex ring 305 serves as a barrier for the protection sheet 40 to improve protection.

[0124] like Fig.24 and Fig.26 As shown, in actual use, the protection sheet 40 is connected to the cover plate 300. From the injection hole 200 toward the outside of the battery, when the downstream side of the sealing member 10 is located downstream of the cover plate 300, a third step 303 is provided downstream of the cover plate 300, and the third step 303 is convexly arranged around the injection hole 200 toward the outside of the battery, the downstream side of the third step 303 is located downstream of the sealing member 10, and the protection sheet 40 is arranged on the side of the third step 303 facing the outside of the battery. The provision of the third step 303 allows the protection sheet 40 to be located downstream of the entire sealing member 10 from the injection hole 200 toward the outside of the battery, avoiding interference between the protection sheet 40 and the sealing member 10.

[0125] The downstream side of the sealing member 10 and the downstream side of the cover plate 300 are both defined based on the direction of the injection hole 200 toward the outside of the battery.

[0126] As an implementation manner, when the cavity 112 is formed by a side of the sealing member 10 facing the outside of the battery being recessed into the battery, the cavity 112 and the connecting hole 114 may have the same structure.

[0127] The present application also provides a battery, including a battery case and a cover plate 300 connected to the battery case, wherein one of the battery case and the cover plate 300 is provided with a liquid injection hole 200, and the liquid injection hole sealing structure 100 is installed at the liquid injection hole 200. In some specific embodiments, the liquid injection hole 200 is provided on the cover plate 300.

[0128] It should be noted that the specific manner in which the injection hole 200 is disposed in the battery shell or the cover plate 300 has been described in detail in the above content, so it will not be repeated here.

[0129] like Fig.29 As shown, the number of injection holes 200 can be set to at least two and arranged at intervals. At this time, the above-mentioned injection hole sealing structure 100 is installed at at least one injection hole 200. For example, the cover plate 300 is provided with two injection holes 200 arranged at intervals along its own length direction, and an injection hole sealing structure 100 is installed at one of the injection holes 200 for secondary injection, and the other injection hole 200 can be used for initial injection and sealed after the initial injection. Of course, the injection hole sealing structure 100 can be installed at both injection holes 200. The injection hole sealing structure 100 can also be used for injection during the battery production process. Of course, three, four, etc. injection holes 200 can also be provided.

[0130] Please combine Figures 15 to 17 as well as Fig. 27 , Fig.28 As shown, when performing secondary injection, the following steps can be followed.

[0131] The force applying part 11 is operated to break the battery at the sealing member 10 to form an opening 1001 for secondary liquid injection; the battery is injected with secondary liquid at the opening 1001, and the opening 1001 is sealed after the secondary liquid injection.

[0132] Specifically, pliers or other external tools can be used to act on the force-applying part 111 on the force-applying part 11, and the force-applying part 11 can be clamped or tightened. Then, pull it toward the outside of the battery to break the sealing member 10 to form an opening 1001. If the force-applying part 11 is protruding toward the inside of the battery, the disconnected force-applying part 11 is taken out from the broken part to prevent it from falling into the inside of the battery. Then, use the filling port in the secondary liquid injection tool to align with the above-formed opening 1001 to fill the battery cavity with electrolyte. After the electrolyte is filled in place, remove the secondary liquid injection tool and seal the opening 1001. This arrangement is easy to operate.

[0133] like Fig. 27As shown, optionally, when sealing the opening 1001, a sealing sheet 410 can be welded at one end of the opening 1001 away from the battery cavity. By welding, not only the fixing effect of the sealing sheet 410 relative to the battery is guaranteed, but also the sealing of the connection is ensured to be good, and leakage caused by inadequate sealing after the secondary injection is avoided as much as possible.

[0134] Specifically, the size of the sealing sheet 410 is larger than the size of the opening 1001. Fig.14 , Fig.17 and Fig. 27 As shown, based on the situation that the first sunken platform 2011 is provided on the outer side 3002 of the cover plate and the second sunken platform 2012 is provided on the inner side 3001 of the cover plate, the connection part 12 is integrally connected to the second sunken platform 2012, and the sealing sheet 410 can be pressed on the first sunken platform 2011 and welded and fixed to the side wall of the first sunken platform 2011. Alternatively, when the connection part 12 is integrally connected to the first sunken platform 2011, the size of the sealing sheet 410 is larger than the size of the connection part 12, so as to be pressed on a side wall of the connection part 12 facing the outside of the battery, and then welded and fixed to the cover plate 300.

[0135] like Fig.28 As shown, alternatively, when sealing the opening 1001, the plugging member 420 is inserted into the opening 1001 and then riveted to seal the opening 1001. In actual use, a sealing ring 430 can also be pressed between the cover plate 300 and the plugging member 420. Specifically, the plugging member 420 is inserted into the opening 1001, and the sealing ring 430 is sleeved on the outside of the plugging member 420. One end of the plugging member 420 facing the outside of the battery protrudes from the sealing ring 430 along the injection hole 200 radially, and the sealing ring 430 is located in the first sink 2011 along at least one side of its own thickness. Then, the plugging member 420 can be deformed under the action of external force, and the part of the plugging member 420 outside the battery is pressed on one end surface of the sealing ring 430 facing the outside of the battery, and then the sealing ring 430 is pressed between the plugging member 420 and the first sink 2011, and the sealing ring 430 is relied on to seal between the cover plate 300 and the plugging member 420. For example, the sealing member 420 may be a rivet nut with one end sealed and the other end open, with the open end facing the outside of the battery and the sealing ring 430 pressed thereon.

[0136] In an optional embodiment, before sealing the opening 1001, the edge of the opening 1001 needs to be polished to make the edge of the opening 1001 smooth and remove burrs after the break. Then, the dust and impurities generated during the polishing process are cleaned; or, during the polishing process, the cleaning is performed while polishing.

[0137] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0138] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the scope of patent protection of the present application shall be subject to the attached claims.

Claims

1. A liquid injection hole sealing structure, characterized in that: include: A sealing member (10) is used to seal a liquid injection hole (200) of a battery. The sealing member (10) is integrally connected to a portion of the battery where the liquid injection hole (200) is located. The sealing member (10) includes a force-applying portion (11) for applying an external force to break the hole.

2. The sealing structure of the injection hole according to claim 1, characterized in that: The sealing member (10) and the battery portion where the liquid injection hole (200) is located are integrally stamped, integrally hot-pressed, integrally welded or integrally fused.

3. The sealing structure of the injection hole according to claim 1, characterized in that: The sealing member (10) further comprises a connecting portion (12), wherein the connecting portion (12) is connected to the force-applying portion (11), and the force-applying portion (11) is integrally connected to a battery portion where the liquid injection hole (200) is located via the connecting portion (12).

4. The sealing structure of the injection hole according to claim 3, characterized in that: The force-applying portion (11) is protruding from the connecting portion (12).

5. The sealing structure of the injection hole according to claim 4, characterized in that: The injection hole (200) has an axial direction (X); Along the axial direction (X) of the liquid injection hole (200), the force-applying portion (11) protrudes from the connecting portion (12) toward a side outside the battery; or, along the axial direction (X) of the liquid injection hole (200), the force-applying portion (11) protrudes from the connecting portion (12) toward a side inside the battery.

6. The sealing structure of the injection hole according to claim 5, characterized in that: Along the axial direction (X) of the liquid injection hole (200), a cavity (112) is configured on one side of the force-applying portion (11); When the force-applying portion (11) is convexly arranged from the connecting portion (12) toward the outside of the battery, the cavity (112) is formed by the side of the sealing member (10) facing the inside of the battery being concavely arranged toward the outside of the battery; when the force-applying portion (11) is convexly arranged from the connecting portion (12) toward the inside of the battery, the cavity (112) is formed by the side of the sealing member (10) facing the outside of the battery being concavely arranged toward the inside of the battery.

7. The sealing structure of the injection hole according to claim 3, characterized in that: The injection hole (200) has an axial direction (X), and along the axial direction (X) of the injection hole (200), at least a portion of the force-applying portion (11) is configured as a force-applying portion (111) for cooperating with an external tool; The force-applying portion (11) is protruded from the connecting portion (12) toward the outside of the battery, and the outer dimension of the force-applying portion (111) gradually increases from the connecting portion (12) toward the inside of the battery; or, the force-applying portion (11) is protruded from the connecting portion (12) toward the inside of the battery, and the sealing member (10) is configured with a cavity (112) on the side facing the outside of the battery, and the cavity (112) is at least partially located at the force-applying portion (111), and the inner dimension of the force-applying portion (111) having the cavity (112) gradually increases from the connecting portion (12) toward the inside of the battery.

8. The sealing structure of the injection hole according to claim 1, characterized in that: The force-applying portion (11) is configured with a connection hole (114), the opening of the connection hole (114) is arranged toward the outside of the battery, and the hole wall of the connection hole (114) is configured with a threaded structure.

9. The sealing structure of the injection hole according to claim 1, characterized in that: The sealing member (10) further comprises: A connecting portion (12) connected to and arranged around the force-applying portion (11), and the connecting portion (12) is integrally connected to a battery portion where the liquid injection hole (200) is located; and The weak portion (13) is arranged on the connecting portion (12) or the force-applying portion (11), or is arranged at the intersection of the connecting portion (12) and the force-applying portion (11), or both the connecting portion (12) and the force-applying portion (11) are provided with the weak portion (13); the weak portion (13) is configured to break in response to an external force applied to the force-applying portion (11).

10. The sealing structure of the injection hole according to claim 9, characterized in that: The weak portion (13) is arranged around the location.

11. The sealing structure of the injection hole according to claim 9, characterized in that: The injection hole (200) has an axial direction (X), and along the axial direction (X) of the injection hole (200), at least a portion of the force-applying portion (11) is configured as a force-applying portion (111); along the direction from the connecting portion (12) toward the force-applying portion (111), the weak portion (13) is arranged upstream of the force-applying portion (111).

12. The sealing structure of the injection hole according to claim 9, characterized in that: The portion of the sealing member (10) that is removed after being broken through the weak portion (13) is the removal portion (1002); The force-applying portion (11) protrudes from the connecting portion (12) toward the side of the battery, and / or the sealing member (10) is integrally connected to the side of the battery portion where the injection hole (200) is located, which faces the side of the battery; the maximum outer dimension of the removal portion (1002) along the radial direction of the injection hole (200) is less than or equal to the aperture of the injection hole (200).

13. The sealing structure of the injection hole according to claim 9, characterized in that: The weakened portion (13) is configured as a groove, a tear line or a score.

14. The sealing structure of the injection hole according to claim 1, characterized in that: The injection hole (200) has an axial direction (X), and a sink (201) is constructed at the battery portion where at least one end of the injection hole (200) along its own axial direction (X) is located, and a portion of the sealing member (10) is accommodated in the sink (201).

15. The sealing structure of the injection hole according to claim 1, characterized in that: The liquid injection hole sealing structure (100) further comprises a sealing cover (20), wherein the sealing cover (20) is arranged on a side of the sealing member (10) facing the inside of the battery.

16. The sealing structure of the injection hole according to claim 15, characterized in that: The sealing cover (20) is connected to the side of the battery portion where the injection hole (200) is located, which faces the inside of the battery; or, the portion of the battery portion where the injection hole (200) is located after the sealing member (10) is broken is the remaining portion (1003), and the sealing cover (20) is connected to the remaining portion (1003), and the sealing cover (20) is used to cover the broken portion of the sealing member (10).

17. The sealing structure of the injection hole according to claim 15, characterized in that: The portion to which the sealing cover (20) is connected and the sealing cover (20) are provided with a slot (601) or a convex portion (602) for being inserted into the slot (601); and / or the sealing cover (20) is bonded to the portion to which the sealing cover (20) is connected.

18. The sealing structure of the injection hole according to claim 15, characterized in that: A first step (301) is provided at the portion to which the sealing cover (20) is connected, the first step (301) is recessed along the sealing cover (20) toward the outside of the battery, and the sealing cover (20) is arranged on the first step (301); The first step (301) is concavely arranged from the bottom surface of the portion to which the sealing cover (20) is connected toward the outside of the battery; or, a second step (302) is provided on the bottom surface of the portion to which the sealing cover (20) is connected, the second step (302) is convexly arranged along the sealing cover (20) toward the inside of the battery, the first step (301) is concavely arranged from the protruding end surface of the second step (302) toward the outside of the battery, the first step (301) and the second step (302) both surround the injection hole (200), and the second step (302) surrounds the first step (301).

19. The sealing structure of the injection hole according to claim 1 or 15, characterized in that: The liquid injection hole sealing structure (100) further comprises a protective sheet (40), wherein the protective sheet (40) is covered on a side of the sealing member (10) facing the outside of the battery.

20. The sealing structure of the injection hole according to claim 19, characterized in that: The protective sheet (40) is connected to the battery portion where the liquid injection hole (200) is located; From the injection hole (200) toward the outside of the battery, when the downstream side of the sealing member (10) is located downstream of the battery portion where the injection hole (200) is located, a third step (303) is provided downstream of the battery portion where the injection hole (200) is located, and the third step (303) is protruded around the injection hole (200) toward the outside of the battery, and the downstream side of the third step (303) is located downstream of the sealing member (10), and the protective sheet (40) is provided on the third step (303).

21. The sealing structure of the injection hole according to claim 15, characterized in that: The liquid injection hole sealing structure (100) further comprises a release sheet (30), wherein the release sheet (30) is arranged between the sealing cover (20) and the sealing member (10).

22. A battery, characterized in that: The battery comprises a battery shell and a cover plate (300) connected to the battery shell; The battery shell and / or the cover plate (300) is provided with a liquid injection hole (200), and the liquid injection hole sealing structure (100) according to any one of claims 1 to 21 is installed at the liquid injection hole (200).

23. The battery according to claim 22, characterized in that At least two of the liquid injection holes (200) are provided, and the liquid injection hole sealing structure (100) is installed at at least one of the liquid injection holes (200).

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