Sealing nail, battery and vehicle

Abstract

The utility model is suitable for the technical field of batteries, and discloses a sealing nail, a battery and a vehicle. Wherein the sealing nail is used for being mounted on a top cover body of the battery so as to seal a liquid injection hole in the top cover body. The sealing nail is an integrally-formed metal nail. The metal nail comprises a nail body and a nail cap, the nail body is used for penetrating through the liquid injection hole, the nail body comprises a ventilation rod part, and the ventilation rod part is used for enclosing with the inner side wall of the liquid injection hole to form a ventilation channel for gas to pass through when the ventilation rod part penetrates through the liquid injection hole; the nail cap is arranged at one end of the nail body in a protruding mode and used for being welded to the top cover body. Only one sealing nail provided by the utility model needs to be used in the helium return sealing process, so that the quantity of materials used for sealing the liquid injection hole is reduced, and the operation of the helium return sealing process is simplified. Besides, during helium detection, when a gap exists in welding of the nail cap, helium in the battery can be leaked out through the gap between the nail body and the liquid injection hole and the welding gap of the nail cap in sequence, and therefore it is guaranteed that the battery poor in welding can be effectively detected through helium detection.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery technology field especially relates to a sealing nail, have the battery with the sealing nail and have the vehicle with the battery. BACKGROUND

[0002] A kind of battery provided by relevant technology, in production process needs to execute following back helium sealing procedure: a sealing glue nail is preassembled in the liquid injection hole of battery, vacuum is carried out to battery interior by liquid injection hole, helium is filled into battery interior, sealing glue nail is completely pressed into liquid injection hole, sealing aluminum nail is welded at liquid injection hole, the welding quality of sealing aluminum nail is helium checked.

[0003] The above-mentioned related technology has the following shortcomings in specific application: (1) in back helium sealing procedure, two kinds of nails, sealing glue nail and sealing aluminum nail, are needed, material quantity is much, and operation is troublesome.(2) since sealing glue nail is elastically deformable component, after sealing glue nail is completely pressed into liquid injection hole, interference fit between sealing glue nail and liquid injection hole has realized the plugging and sealing of liquid injection hole, so that, even if welding of sealing aluminum nail exists gap and other poor welding quality problems, helium in battery also cannot leak out, so that helium check cannot effectively check out the battery with poor welding.(3) sealing aluminum nail is in sheet shape, and there is no auxiliary positioning structure between sealing aluminum nail and the top cover of battery after sealing aluminum nail is placed in the top cover, sealing aluminum nail is easily deviated when suction rod retreats, so that sealing aluminum nail is prone to the poor phenomenon of being warped due to deviation, and the welding yield of sealing aluminum nail is affected. UTILITY MODEL CONTENTS

[0004] The first purpose of the utility model is to provide a sealing nail, which aims to solve the technical problems of the related art battery, such as the operation being troublesome and the helium check being unable to effectively check out the battery with poor welding, when the liquid injection hole of the battery is sealed by the sealing glue nail and the sealing aluminum nail.

[0005] To achieve the above-mentioned purpose, the utility model provides a scheme: a sealing nail is used to seal the liquid injection hole on the top cover of the battery; the sealing nail is an integrally formed metal nail;

[0006] The metal nail includes a nail body and a nail cap, the nail body is used to be arranged in the liquid injection hole, and the nail body includes a ventilation rod portion, the ventilation rod portion is used to form a ventilation channel for gas to pass through when being arranged in the liquid injection hole together with the inner side wall of the liquid injection hole;

[0007] The nail cap is protruded from one end of the nail body to be welded with the top cover.

[0008] In one embodiment, the metal nail further includes a first positioning structure, the first positioning structure and the nail body are formed on the same side of the nail head, and the orthographic projection of the first positioning structure on the nail head is located on the outer periphery of the orthographic projection of the nail body on the nail head, the first positioning structure is used to engage with a second positioning structure on the top cover.

[0009] In one embodiment, the first positioning structure is an annular structure that is arranged around the central axis of the sealing nail and joined end to end;

[0010] Alternatively, the first positioning structure may include a plurality of sub-positioning structures, which are spaced apart around the central axis of the sealing nail.

[0011] In one embodiment, the first positioning structure is a protrusion protruding from the nail head;

[0012] Alternatively, the first positioning structure may be a groove recessed into the nail head.

[0013] In one embodiment, the outer wall of the venting rod is provided with a venting structure, which is used to be spaced apart from the inner wall of the injection hole when the venting rod passes through the injection hole so as to form the venting channel by surrounding the inner wall of the injection hole.

[0014] The ventilation structure is a plane or groove formed on the outer wall of the ventilation rod portion, and the plane or groove extends from one axial end of the ventilation rod portion to the other axial end of the ventilation rod portion.

[0015] In one embodiment, there are multiple ventilation structures, which are spaced apart around the central axis of the sealing nail;

[0016] Alternatively, the number of the ventilation structures may be one.

[0017] In one embodiment, the nail body further includes a guide rod portion that extends from the vent rod portion in a direction away from the nail head with a gradually decreasing radial dimension;

[0018] And / or, the nail body further includes a cylindrical rod portion, the cylindrical rod portion being connected between the nail head and the venting rod portion, the outer diameter of the cylindrical rod portion being greater than or equal to the outer diameter of the venting rod portion.

[0019] The second objective of this invention is to provide a battery comprising:

[0020] A housing having a cavity formed therein;

[0021] A top cover is attached to the top of the housing and encloses the housing to form an inner cavity. The top cover has an injection hole that communicates with the inner cavity for injecting electrolyte into the inner cavity.

[0022] The battery cell is housed within the inner cavity;

[0023] The aforementioned sealing nail is installed in the injection hole, with the nail body passing through the injection hole and the nail head welded to the top cover.

[0024] In one embodiment, the metal nail further includes a first positioning structure, the first positioning structure and the nail body are formed on the same side of the nail head, and the orthographic projection of the first positioning structure on the nail head is located on the outer periphery of the orthographic projection of the nail body on the nail head. The top cover also forms a second positioning structure, the second positioning structure is disposed on the outer periphery of the injection hole, and the first positioning structure is used to engage with the second positioning structure on the top cover.

[0025] And / or, the top cover also forms a settling groove, the injection hole extends through the bottom of the settling groove and communicates with the inner cavity, the nail cap is received in the settling groove, and the outer edge of the top of the nail cap is welded to the inner wall of the settling groove.

[0026] A third objective of this invention is to provide a vehicle comprising a frame and the aforementioned battery, wherein the battery is mounted on the frame.

[0027] The sealing nail, battery, and vehicle provided by this utility model are made of a single metal nail, with the nail body for inserting into the injection hole and the nail head for welding to the top cover of the battery. A venting rod is provided on the nail body to form a venting channel by enclosing the inner wall of the injection hole. This allows the nail body to perform the pre-compression operation in the helium return sealing process, and the nail head to perform the welding operation. In other words, only one sealing nail is needed to complete the pre-compression and welding operations in the helium return sealing process, effectively reducing the amount of material used for sealing the injection hole and simplifying the helium return sealing operation. Furthermore, because the nail body is made of metal, even if the nail body is fully inserted into the injection hole, a complete seal cannot be achieved. Therefore, during helium testing, if there is a gap in the weld of the nail head, helium gas inside the battery will leak out sequentially through the gap between the nail body and the injection hole, and through the weld gap in the nail head, ensuring that the helium test can effectively detect batteries with poor welding. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of 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 the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the sealing nail in a pre-compression state according to an embodiment of the present invention;

[0030] Figure 2 This is a schematic diagram of the sealing nail in a fully pressed-in state according to an embodiment of the present invention;

[0031] Figure 3 This is a front view schematic diagram of the sealing nail provided in an embodiment of this utility model;

[0032] Figure 4 This applies when the ventilation structure is planar and there are three ventilation structures. Figure 3 A cross-sectional schematic diagram of AA in the middle;

[0033] Figure 5 Is Figure 4 A schematic diagram of a modified scheme that changes the number of ventilation structures to two based on the above.

[0034] Figure 6 Is Figure 4 A schematic diagram of a modified scheme where the number of ventilation structures is changed to one;

[0035] Figure 7 Is Figure 4 A schematic diagram of a modified ventilation structure with a groove, based on the above.

[0036] Figure 8 Is Figure 4 A schematic diagram of a modified scheme that replaces the nail body with one without a cylindrical rod;

[0037] Figure 9 This is a top view of the top cover provided in an embodiment of the present utility model;

[0038] Figure 10 yes Figure 9 A magnified view of a portion of the injection hole;

[0039] Figure 11 yes Figure 9 A partial cross-sectional view of the injection hole.

[0040] Explanation of reference numerals: 100, sealing nail; 110, nail body; 111, venting rod; 111a, venting structure; 111b, arc-shaped abutment structure; 112, guide rod; 113, cylindrical rod; 120, nail head; 130, first positioning structure; 200, top cover; 210, injection hole; 220, second positioning structure; 230, settling tank; 300, venting channel. Detailed Implementation

[0041] 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.

[0042] Reference Figures 1 to 3 As shown, this embodiment of the present invention provides a sealing pin 100, which is used to install on the top cover 200 of the battery to seal the liquid injection hole 210 on the top cover 200. This sealing pin 100 can be used for pre-compression and welding operations in the helium recirculation sealing process; that is, only one sealing pin 100 provided in this embodiment is needed to complete the pre-compression and welding sealing in the helium recirculation sealing process.

[0043] In one embodiment, the sealing nail 100 is a one-piece molded metal nail, that is, the sealing nail 100 is made of metal material, and the sealing nail 100 is a one-piece molded component, rather than being assembled from multiple components.

[0044] Reference Figures 1 to 3As shown, in one embodiment, the metal nail includes a nail body 110 and a nail head 120. The nail body 110 is used to pass through the injection hole 210. The nail body 110 includes a venting rod portion 111, which, when passing through the injection hole 210, surrounds the inner wall of the injection hole 210 to form a venting channel 300 for gas passage. The nail head 120 protrudes from one end of the nail body 110 for welding to the top cover 200. The nail body 110 is used to perform a pre-pressing nail operation on the injection hole 210 during the helium return sealing process, and the nail head 120 is used to perform a welding sealing operation on the injection hole 210 during the helium return sealing process. Specifically, in the helium return sealing process, the venting rod 111 is inserted into the injection hole 210. At this time, the venting rod 111 and the inner wall of the injection hole 210 form a venting channel 300. During vacuuming, air inside the battery can be extracted through the venting channel 300. During helium filling, helium can be filled into the battery through the venting channel 300. In this embodiment, since the nail body 110 used for pre-compression and the nail head 120 used for welding to the battery top cover 200 are integrally formed metal nails, only one sealing nail 100 provided in this embodiment is needed to complete the pre-compression and welding operations in the helium return sealing process. This effectively reduces the amount of material used for sealing the injection hole 210 and simplifies the helium return sealing process. Furthermore, since the nail body 110 inserted into the injection hole 210 is made of metal, even if the nail body 110 is completely inserted into the injection hole 210, it is impossible to completely seal the injection hole 210. Thus, during helium testing, if there is a gap in the weld of the nail head 120, the helium gas inside the battery will leak out sequentially through the gap between the nail body 110 and the injection hole 210 and the weld gap of the nail head 120, thereby ensuring that helium testing can effectively detect batteries with poor welding.

[0045] Reference Figure 1 and Figure 4 As shown, in one embodiment, a ventilation structure 111a is formed on the outer wall of the ventilation rod portion 111. The ventilation structure 111a is arranged at a distance from the inner wall of the injection hole 210 when the ventilation rod portion 111 passes through the injection hole 210, so as to form a ventilation channel 300 by surrounding the inner wall of the injection hole 210. When the ventilation rod portion 111 passes through the injection hole 210, the ventilation structure 111a does not fit against the inner wall of the injection hole 210, but there is a certain gap between it and the inner wall of the injection hole 210. This gap forms the ventilation channel 300.

[0046] Reference Figure 1 and Figures 4 to 6As shown, in one embodiment, the ventilation structure 111a is a plane formed on the outer wall of the ventilation rod 111, extending from one axial end of the ventilation rod 111 to the other axial end. The ventilation structure 111a is equivalent to a structure formed by cutting off a portion of a cylindrical rod with a plane. The injection hole 210 is a circular hole. When the ventilation rod 111 passes through the injection hole 210, the plane, which is part of the outer wall of the ventilation rod 111, does not come into contact with the inner wall of the injection hole 210, but rather there is a certain gap between them to form a ventilation channel 300. In this embodiment, using a plane as the ventilation structure 111a is simple in structure, easy to manufacture, and facilitates the formation of a sufficiently large ventilation channel 300 by the ventilation structure 111a and the inner wall of the injection hole 210, thereby improving the efficiency of vacuuming and helium filling operations.

[0047] Of course, in specific applications, the ventilation structure 111a is not limited to a planar shape. For example, refer to... Figure 1 and Figure 7 As shown, as an alternative embodiment, the venting structure 111a is formed in a groove on the outer wall of the venting rod portion 111, extending from one axial end of the venting rod portion 111 to the other axial end. The groove is recessed from the outer wall of the venting rod portion 111 toward the central axis of the venting rod portion 111. When the venting rod portion 111 passes through the injection hole 210, the groove wall recessed in the outer wall of the venting rod portion 111 does not come into contact with the inner wall of the injection hole 210, but rather there is a certain gap between the groove and the inner wall of the injection hole 210 to form a venting channel 300.

[0048] Reference Figure 1 , Figure 4 and Figure 5 As shown, in one embodiment, there are multiple venting structures 111a, which are spaced apart around the central axis of the sealing pin 100. Here, "multiple" means two or more. In this embodiment, setting the number of venting structures 111a to multiple allows the venting rod 111 to form multiple venting channels 300 when it passes through the injection hole 210 and surrounds the inner wall of the injection hole 210. This improves the efficiency of vacuuming and helium filling operations and reduces the material usage of the sealing pin 100. Of course, in specific applications, the number of venting structures 111a is not limited to multiple; for example, referring to… Figure 1 and Figure 6 As shown, as an alternative implementation, the number of ventilation structures 111a can also be one. In this alternative implementation, when the ventilation rod 111 passes through the injection hole 210, it surrounds the inner sidewall of the injection hole 210 to form a single ventilation channel 300.

[0049] ReferenceFigure 1 and Figure 4 As shown, in one embodiment, the outer wall of the venting rod 111 includes multiple circumferentially alternating arc-shaped abutment structures 111b and venting structures 111a, that is, an arc-shaped abutment structure 111b is formed between any two adjacent venting structures 111a, and a venting structure 111a is formed between any two adjacent arc-shaped abutment structures 111b. The arc-shaped abutment structure 111b is an arc-shaped wall surface, and the diameter of the arc-shaped abutment structure 111b is approximately equal to the diameter of the injection hole 210. When the venting rod 111 passes through the injection hole 210, the arc-shaped abutment structure 111b is in close contact with the inner wall of the injection hole 210.

[0050] Reference Figure 1 and Figure 4 As shown, in one embodiment, there are three venting structures 111a, which are spaced apart around the central axis of the sealing nail 100. When the venting structure 111a is planar, the three planes are triangularly distributed, and adjacent planes are connected by an arc-shaped abutment structure 111b, that is, adjacent planes are transitionally connected by an arc-shaped wall surface (i.e., arc-shaped abutment structure 111b). The venting rod 111 is a triangular rod with a rounded apex. When inserted into the injection hole 210, it forms three venting channels 300 with the inner wall of the injection hole 210. The triangular nail 110 is used to leave gaps around its periphery with the inner wall of the injection hole 210 to form three venting channels 300 for vacuuming and helium return. During vacuuming, air can flow out of the battery through the gaps, and during helium return, helium gas enters the battery through the gaps. Of course, in specific applications, the number of venting structures 111a and the shape of the venting rod 111 are not limited to this. For example, refer to Figure 1 and Figure 5 As shown, as an alternative implementation, there are two venting structures 111a. When the venting structure 111a is planar, the two planes are arranged parallel to each other at intervals, or one plane is inclined relative to the other plane. When inserted into the injection hole 210, it encloses the inner wall of the injection hole 210 to form two ventilation channels 300. Alternatively, as another alternative implementation, there are four, five, six or more venting structures 111a. When inserted into the injection hole 210, they enclose the inner wall of the injection hole 210 to form four, five, six or more ventilation channels 300. The venting rod 111 is a rectangular rod, a pentagonal rod, a hexagonal rod, or other polygonal rod.

[0051] Reference Figures 1 to 3As shown, in one embodiment, the nail body 110 also includes a guide rod portion 112, which extends from the vent rod portion 111 in a direction away from the nail head 120 with a gradually decreasing radial dimension. The guide rod portion 112 is a tapered rod. The provision of the guide rod portion 112 makes it easier for the nail body 110 to pass through the injection hole 210, which facilitates the rapid completion of the pre-compression nail operation. Of course, in specific applications, as an alternative implementation, the guide rod portion 112 can also be omitted.

[0052] Reference Figures 1 to 4 As shown, in one embodiment, the nail body 110 also includes a cylindrical rod portion 113, which is connected between the nail head 120 and the venting rod portion 111. The outer diameter of the cylindrical rod portion 113 is equal to the outer diameter of the venting rod portion 111. The helium recirculation sealing process is as follows: The guide rod 112 and the vent rod 111 are sequentially inserted into the injection hole 210 to pre-press the sealing nail 100. At this time, the bottom of the nail head 120 does not contact the top cover 200, meaning there is a gap between the bottom of the nail head 120 and the top cover 200 for gas to pass through. A vacuum is then drawn into the battery through the injection hole 210. Helium is then introduced into the battery. The cylindrical rod 113 is fully pressed into the injection hole 210, at which point the bottom of the nail head 120 contacts the top cover 200. The outer edge of the top of the nail head 120 is welded to the inner wall of the injection hole 210. The welding quality of the sealing nail 100 is then inspected using helium. The cylindrical rod portion 113 is designed so that the nail body will not easily and completely insert into the injection hole 210 during pre-pressing, leaving a gap between the bottom of the nail head 120 and the top cover 200 to facilitate vacuuming and helium filling operations. In this embodiment, the outer diameter of both the cylindrical rod portion 113 and the outer diameter of the venting rod portion 111 are equal to the diameter of the injection hole 210. Of course, in specific applications, as an alternative embodiment, the outer diameter of the cylindrical rod portion 113 can also be set to be larger than the outer diameter of the venting rod portion 111.

[0053] In the above scheme, the nail body 110 also has a cylindrical rod portion 113 between the nail head 120 and the vent rod portion 111. Of course, in specific applications, the arrangement of the nail body 110 is not limited to this. For example, refer to... Figure 1 , Figure 3 and Figure 8As shown, as an alternative implementation, the cylindrical rod 113 can be omitted, and the top end of the venting rod 111 can be directly connected to the nail head 120, i.e., the venting rod 111 can be made longer. In this alternative implementation, the operation process of the helium return sealing process is as follows: the guide rod 112 and part of the venting rod 111 are sequentially inserted into the injection hole 210 to complete the pre-pressing of the sealing nail 100, at which time the bottom of the nail head 120 does not contact the top cover 200; the battery is evacuated through the injection hole 210; helium is injected into the battery; the venting rod 111 is fully pressed into the injection hole 210, at which time the bottom of the nail head 120 contacts the top cover 200; the top outer edge of the nail head 120 is welded to the inner wall of the injection hole 210; the welding quality of the sealing nail 100 is checked with helium.

[0054] Reference Figures 1 to 3 As shown, in one embodiment, the metal nail also includes a first positioning structure 130. The first positioning structure 130 and the nail body 110 are formed on the same side of the nail head 120, and the orthographic projection of the first positioning structure 130 on the nail head 120 is located on the outer periphery of the orthographic projection of the nail body 110 on the nail head 120. The first positioning structure 130 is used to engage with the second positioning structure 220 on the top cover 200. Specifically, both the first positioning structure 130 and the nail body 110 are located at the bottom of the nail head 120, and the distance from the first positioning structure 130 to the central axis of the sealing nail 100 is greater than the distance from the nail body 110 to the central axis of the sealing nail 100. The first positioning structure 130 is used for auxiliary positioning with the top cover 200. In specific applications, when the nail is pre-pressed, the first positioning structure 130 and the second positioning structure 220 do not engage; only when the rod is fully pressed into the injection hole 210 do the first positioning structure 130 and the second positioning structure 220 engage. The locking and engagement of the first positioning structure 130 and the second positioning structure 220 ensures that the nail head 120 will not shift during the subsequent welding process, and the position of the nail head 120 will be without deviation, thereby helping to ensure the welding yield of the sealing nail 100.

[0055] Reference Figure 3 and Figure 4 As shown, in one embodiment, the first positioning structure 130 is an annular structure that surrounds the central axis of the sealing nail 100 and is joined end to end; that is, the first positioning structure 130 is a circumferentially closed and complete annular structure. Of course, in specific applications, the arrangement of the first positioning structure 130 is not limited to this. For example, as an alternative embodiment, the first positioning structure 130 includes multiple sub-positioning structures, which are spaced apart around the central axis of the sealing nail 100. In this alternative embodiment, the first positioning structure 130 is composed of multiple sub-positioning structures spaced apart along the circumferential direction.

[0056] In one implementation, one of the first positioning structure 130 and the second positioning structure 220 is a protrusion, and the other is a groove that engages with the protrusion. That is, the first positioning structure 130 can be a protrusion protruding from the nail head 120, in which case the second positioning structure 220 is a groove recessed into the top cover 200; or, the first positioning structure 130 can also be a groove recessed into the nail head 120, in which case the second positioning structure 220 is a protrusion protruding from the top cover 200. By using the engagement of the protrusion and the groove, auxiliary positioning of the sealing nail 100 and the top cover 200 can be achieved, and its structure is simple and easy to manufacture.

[0057] Reference Figures 1 to 4 and Figure 10 As shown, in one specific embodiment, the first positioning structure 130 is an annular protrusion protruding from the bottom of the nail head 120, and the second positioning structure 220 is an annular groove recessed in the top cover 200. Alternatively, in another specific embodiment, the first positioning structure 130 includes a plurality of arc-shaped protrusions protruding from the bottom of the nail head 120 and spaced apart circumferentially, and the second positioning structure 220 is an annular groove recessed in the top cover 200 or includes a plurality of arc-shaped grooves recessed in the top cover 200 and spaced apart circumferentially.

[0058] Reference Figures 1 to 4 and Figure 11 As shown, in one embodiment, the nail head 120 extends toward the nail body 110 with a gradually decreasing radial dimension, that is, the nail head 120 is conical. This makes the shape of the nail head 120 fit with the conical recess 230 on the top cover 200 for receiving the nail head 120, which is beneficial for the nail head 120 to be better received in the recess 230 of the top cover 200.

[0059] In one implementation, the sealing nail 100 is made of aluminum, and the top cover 200 is also made of aluminum. This ensures that the sealing nail 100 and the top cover 200 are made of the same material, thereby improving the welding quality between them. The sealing nail 100 and the top cover 200 can be made of aluminum alloy or pure aluminum. Of course, in specific applications, as an alternative implementation, the sealing nail 100 and the top cover 200 can also be made of other metal materials, such as copper alloy, copper, or stainless steel.

[0060] Reference Figures 1 to 3 and Figures 9 to 11As shown, this embodiment of the present invention also provides a battery, which includes a top cover 200 and the aforementioned sealing pin 100. The top cover 200 has an injection hole 210. The sealing pin 100 is installed in the injection hole 210, with the pin body 110 passing through the injection hole 210 and the pin head 120 welded to the top cover 200. Because the battery provided in this embodiment uses the aforementioned integrally formed metal pin to seal the injection hole 210, only one sealing pin 100 is needed to complete the pre-pressing and welding operations in the helium return sealing process. This effectively reduces the amount of material used to seal the injection hole 210 and simplifies the helium return sealing process. Furthermore, since the nail body 110 inserted into the injection hole 210 is made of metal, even if the nail body 110 is completely inserted into the injection hole 210, it is impossible to completely seal the injection hole 210. Thus, during helium testing, if there is a gap in the weld of the nail head 120, the helium gas inside the battery will leak out sequentially through the gap between the nail body 110 and the injection hole 210 and the weld gap of the nail head 120, thereby ensuring that helium testing can effectively detect batteries with poor welding.

[0061] In one embodiment, the battery further includes a casing (not shown) and a battery cell (not shown), the casing having a cavity. A top cover 200 is fitted onto the top of the casing and encloses the casing to form an inner cavity, with an injection hole 210 communicating with the inner cavity for injecting electrolyte into the inner cavity. The battery cell is housed within the inner cavity. The inner cavity is used to house the battery cell and the electrolyte. The casing and the top cover 200 constitute the battery outer shell, which can be used to protect the battery cell.

[0062] Reference Figures 1 to 3 and Figures 9 to 11 As shown, in one embodiment, the metal nail further includes a first positioning structure 130. The first positioning structure 130 and the nail body 110 are formed on the same side of the nail head 120, and the orthographic projection of the first positioning structure 130 on the nail head 120 is located on the outer periphery of the orthographic projection of the nail body 110 on the nail head 120. The top cover 200 also has a second positioning structure 220, which is located on the outer periphery of the injection hole 210. The first positioning structure 130 is used to engage with the second positioning structure 220 on the top cover 200. The arrangement of the first positioning structure 130 and the second positioning structure 220 is the same as described in the above description of the sealing nail 100, and will not be described in detail here.

[0063] Reference Figures 1 to 3 and Figures 9 to 11As shown, in one embodiment, the top cover 200 also forms a recess 230. An injection hole 210 penetrates the bottom of the recess 230 and communicates with the inner cavity. The nail cap 120 is housed within the recess 230, and the outer edge of the top of the nail cap 120 is welded to the inner wall of the recess 230. The recess 230 has an upwardly opening, and the bottom of the recess 230 is a wall spaced apart from the opening. The recess 230 allows the nail cap 120 to be completely housed within the top cover 200, preventing it from protruding beyond the top cover 200. This improves the battery's aesthetic appearance and also protects the sealing nail 100.

[0064] In one implementation, the depth of the recess 230 is the same as the thickness of the nail head 120. After the sealing nail 100 is installed on the top cover 200, the top surface of the nail head 120 is flush with the edge of the recess 230. Of course, in specific applications, as an alternative implementation, the depth of the recess 230 can also be greater than the thickness of the nail head 120, and after the sealing nail 100 is installed on the top cover 200, the top surface of the nail head 120 is lower than the edge of the recess 230.

[0065] Reference Figures 1 to 4 and Figure 10 As shown in the illustration, in one specific embodiment, the sealing nail 100 includes a nail head 120, a nail body 110, and a first positioning structure 130. The nail body 110 includes a cylindrical rod portion 113, a venting rod portion 111, and a guide rod portion 112. The cylindrical rod portion 113, the venting rod portion 111, and the guide rod portion 112 extend sequentially from the nail head 120 along the axial direction of the sealing nail 100. The venting rod portion 111 is a triangular rod with a rounded apex, and the guide rod portion 112 is a conical rod. The first positioning structure 130 is an annular protrusion surrounding the outer periphery of the nail body 110, and the second positioning structure 220 is an annular groove. In this embodiment, the helium return sealing process is as follows: the guide rod 112 and the vent rod 111 are sequentially inserted into the injection hole 210 to complete the pre-pressing of the sealing nail 100, at which time the bottom of the nail head 120 does not contact the bottom of the settling tank 230; the battery is evacuated through the injection hole 210; helium is injected into the battery; the cylindrical rod 113 is fully pressed into the injection hole 210, at which time the annular protrusion is also inserted into the arc-shaped groove, and the bottom of the nail head 120 contacts the bottom of the settling tank 230; the top outer edge of the nail head 120 is welded to the inner wall of the injection hole 210; the welding quality of the sealing nail 100 is inspected using helium.

[0066] Reference Figures 1 to 3 , Figure 8 and Figure 10As shown, in another specific embodiment, the sealing nail 100 includes a nail head 120, a nail body 110, and a first positioning structure 130. The nail body 110 includes a venting rod portion 111 and a guide rod portion 112, which extend sequentially from the nail head 120 along the axial direction of the sealing nail 100. The venting rod portion 111 is a triangular rod with a rounded apex, and the guide rod portion 112 is a conical rod. The first positioning structure 130 is an annular protrusion surrounding the outer periphery of the nail body 110. In this embodiment, the helium return sealing process is as follows: the guide rod 112 and part of the venting rod 111 are sequentially inserted into the injection hole 210 to complete the pre-pressing of the sealing nail 100, at which time the bottom of the nail head 120 does not contact the bottom of the settling tank 230; the battery is evacuated through the injection hole 210; helium is injected into the battery; the venting rod 111 is fully pressed into the injection hole 210, at which time the annular protrusion is also inserted into the arc-shaped groove, and the bottom of the nail head 120 contacts the bottom of the settling tank 230; the top outer edge of the nail head 120 is welded to the inner wall of the injection hole 210; the welding quality of the sealing nail 100 is inspected with helium.

[0067] This embodiment of the invention also provides a vehicle comprising a frame and the aforementioned battery, the battery being mounted on the frame. Because this vehicle utilizes the aforementioned battery, it helps to reduce vehicle costs and improve vehicle production efficiency and quality. Of course, in specific applications, the aforementioned battery is not limited to vehicles.

[0068] As one implementation method, the aforementioned vehicles can be either gasoline-powered vehicles or new energy vehicles. When a vehicle is a new energy vehicle, it can be a hybrid vehicle or a pure electric vehicle.

[0069] In one implementation, the aforementioned vehicles can be private cars, such as sedans, SUVs, MPVs, or pickup trucks. Vehicles can also be commercial vehicles, such as vans, buses, small trucks, or large semi-trailers.

[0070] This embodiment of the invention optimizes the structure of the sealing nail 100 by using a single, integrally formed metal nail to simultaneously complete the pre-compression and welding operations of the helium return sealing process. That is, only one sealing nail 100 needs to be inserted during the helium return sealing process; the sealing nail 100 can be used for both pre-compression and welding, simplifying the helium return sealing process and making it easier to detect welding defects during helium testing. Furthermore, by further providing a first positioning structure 130 at the bottom of the nail cap 120 for auxiliary positioning of the sealing nail 100 and the top cover 200, the sealing nail 100 is pressed into the predetermined position during the full-compression operation (the operation of fully pressing the nail body 110 into the injection hole 210), ensuring its stability. During subsequent movement or processing, the sealing nail 100 will not shift or misalign. Due to the precise fixing of the sealing nail 100's position, the defect rate of the dislodged nail is significantly reduced, thereby improving the welding yield of the sealing nail 100.

[0071] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A sealing pin for mounting on the top cover of a battery to seal the liquid injection hole on the top cover; characterized in that: The sealing nail is a one-piece molded metal nail; The metal nail includes a nail body and a nail head. The nail body is used to pass through the injection hole. The nail body includes a venting rod portion. The venting rod portion is used to form a venting channel for gas passage by enclosing the inner wall of the injection hole when it passes through the injection hole. The nail head protrudes from one end of the nail body for welding to the top cover.

2. The sealing nail as described in claim 1, characterized in that: The metal nail further includes a first positioning structure, which is formed on the same side of the nail head as the nail body. The orthographic projection of the first positioning structure on the nail head is located on the outer periphery of the orthographic projection of the nail body on the nail head. The first positioning structure is used to engage with a second positioning structure on the top cover.

3. The sealing nail as described in claim 2, characterized in that: The first positioning structure is a ring structure that is arranged around the central axis of the sealing nail and joined end to end; Alternatively, the first positioning structure may include a plurality of sub-positioning structures, which are spaced apart around the central axis of the sealing nail.

4. The sealing nail as described in claim 2 or 3, characterized in that: The first positioning structure is a protrusion that protrudes from the nail head; Alternatively, the first positioning structure may be a groove recessed into the nail head.

5. The sealing nail as described in any one of claims 1 to 3, characterized in that: The outer wall of the venting rod is provided with a venting structure. The venting structure is provided at a distance from the inner wall of the injection hole when the venting rod passes through the injection hole, so as to form the venting channel by surrounding the inner wall of the injection hole. The ventilation structure is a plane or groove formed on the outer wall of the ventilation rod portion, and the plane or groove extends from one axial end of the ventilation rod portion to the other axial end of the ventilation rod portion.

6. The sealing nail as described in claim 5, characterized in that: The number of ventilation structures is multiple, and the multiple ventilation structures are distributed at intervals around the central axis of the sealing nail; Alternatively, the number of the ventilation structures may be one.

7. The sealing nail as described in any one of claims 1 to 3, characterized in that: The nail body also includes a guide rod portion, which extends from the vent rod portion in a direction away from the nail head with a gradually decreasing radial dimension; And / or, the nail body further includes a cylindrical rod portion, the cylindrical rod portion being connected between the nail head and the venting rod portion, the outer diameter of the cylindrical rod portion being greater than or equal to the outer diameter of the venting rod portion.

8. A battery, characterized in that: include: A housing having a cavity formed therein; A top cover is attached to the top of the housing and encloses the housing to form an inner cavity. The top cover has an injection hole that communicates with the inner cavity for injecting electrolyte into the inner cavity. The battery cell is housed within the inner cavity; The sealing nail as described in any one of claims 1 to 7, wherein the sealing nail is installed in the injection hole, the nail body passes through the injection hole, and the nail head is welded to the top cover.

9. The battery as described in claim 8, characterized in that: The metal nail also includes a first positioning structure, which is formed on the same side of the nail head as the nail body. The orthographic projection of the first positioning structure on the nail head is located on the outer periphery of the orthographic projection of the nail body on the nail head. The top cover also has a second positioning structure, which is located on the outer periphery of the injection hole. The first positioning structure is used to engage with the second positioning structure on the top cover. And / or, the top cover also forms a settling groove, the injection hole extends through the bottom of the settling groove and communicates with the inner cavity, the nail cap is received in the settling groove, and the outer edge of the top of the nail cap is welded to the inner wall of the settling groove.

10. A vehicle, characterized in that: It includes a frame and a battery as described in claim 8 or 9, wherein the battery is mounted on the frame.

Images