Liquid injection port sealing glue nail and battery

Abstract

The sealing rubber nail comprises a rubber nail body, the rubber nail body is columnar and is provided with an outer side face, a first end face and a second end face, the first end face and the second end face are arranged in a back-to-back mode and face a first direction and a second direction respectively, and the rubber nail body is provided with a hole channel communicated with the first end face and the second end face. A sealing piece is arranged at the other end, facing the first direction, of the duct; the sealing piece has a closed state and an open state; when the sealing piece is in a closed state, the sealing piece abuts against the plastic nail body and blocks the hole channel. When the sealing piece is in the open state, the sealing piece is separated from the plastic nail body in the first direction, and the hole channel is opened. When the sealing metal nail is welded, the sealing rubber nail seals the hole channel, helium in the battery cannot leak out, when leakage detection is carried out on the sealing metal nail, if the sealing metal nail leaks, the sealing rubber nail opens the hole channel, helium in the battery can leak out, and therefore whether leakage exists in the welding process of the sealing metal nail of the liquid injection opening or not can be detected.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a liquid injection port sealing nail and a battery. Background Art

[0002] At present, before the square aluminum shell battery is welded with the sealing metal nail, the square aluminum shell will be injected for the last time, and a certain amount of helium will be injected at the same time. Then, the sealing nail will be used to block the liquid injection port. The purpose is to prevent the helium from volatilizing too quickly. After the sealing metal nail is welded, the helium detector is used to detect whether the battery has helium leakage, so as to judge whether the sealing metal nail welding is defective. However, the structure of the sealing nail currently used is to block the liquid injection port by interference fit with the liquid injection port. While sealing, it also completely blocks the volatilization of helium, so that the helium detector cannot detect whether the battery has helium leakage. Therefore, there is no way to judge whether the sealing metal nail welding of the battery is defective. If the sealing metal nail welding is defective, the electrolyte of the battery will leak in the subsequent use, thereby causing the battery to fail, which has a great safety risk. How to provide a liquid injection port sealing nail and battery that is easy to detect whether the sealing metal nail welding of the liquid injection port has leakage is a technical problem that needs to be solved in this field. Utility Model Content

[0003] Therefore, the technical problem to be solved by the utility model is to provide a liquid filling port sealing nail and a battery which are convenient for detecting whether there is leakage in the welding of the sealing metal nail of the liquid filling port.

[0004] In order to solve the above technical problems, the utility model provides a liquid injection port sealing glue nail, including a glue nail body, the glue nail body is columnar, and has an outer side surface, a first end surface and a second end surface, the outer side surface is used to completely fit with the inner wall of the liquid injection port, the first end surface and the second end surface are arranged opposite to each other and face the first direction and the second direction respectively,

[0005] The nail body is provided with a channel connecting the first end face and the second end face, one end of the channel facing the second direction is connected with the cavity of the battery housing, and the other end of the channel facing the first direction is provided with a sealing member;

[0006] The closure has a closed state and an open state;

[0007] When the sealing member is in a closed state, the sealing member abuts against the nail body and blocks the hole;

[0008] When the sealing member is in the open state, the sealing member is separated from the nail body along the first direction and the hole is opened.

[0009] Further, the closure member comprises a blocking portion and an elastic telescopic portion, the blocking portion is used to close or open the hole, and the elastic telescopic portion is located inside the hole and is used to apply an elastic restoring force toward the second direction to the blocking portion;

[0010] When the closure member is in a closed state, the deformation amount of the elastic telescopic portion is ΔL1, and the blocking portion abuts against the nail body and blocks the channel;

[0011] When the closure member is in the open state, the deformation amount of the elastic telescopic portion is ΔL2, and the blocking portion is separated from the nail body along the first direction and the hole is opened;

[0012] ΔL2 is greater than ΔL1.

[0013] Furthermore, the closure member also includes a supporting portion, which is connected to the inner wall of the channel, and has a first surface facing the first direction, a second surface facing the second direction, and a through hole connecting the first surface and the second surface of the supporting portion, and the two ends of the elastic telescopic portion are respectively connected to the first surface of the supporting portion and the sealing portion.

[0014] Further, the channel includes a first large-aperture channel and a first small-aperture channel, the first large-aperture channel and the first small-aperture channel are interconnected to form a step hole, the step surface of the step hole faces the first direction, and when the closure is in a closed state, the blocking portion is arranged in the first large-aperture channel of the step hole and abuts against the step surface of the step hole, the supporting portion is arranged in the first small-aperture channel of the step hole, and the outer wall of the supporting portion abuts against the inner wall of the first small-aperture channel.

[0015] Furthermore, the elastic telescopic portion is connected to the center position of the supporting portion, and the supporting portion is provided with a plurality of the through holes evenly distributed around the center thereof.

[0016] Furthermore, the supporting portion is arranged on the second direction side of the blocking portion, the length of the elastically retractable portion in a natural state is L1, when the closure is in a closed state, the length of the elastically retractable portion is L2, and when the closure is in an open state, the length of the elastically retractable portion is L3, and L1, L2 and L3 increase sequentially.

[0017] Furthermore, the blocking portion, the elastic telescopic portion and the supporting portion are an integrated structure made of rubber material.

[0018] The utility model also provides a battery, comprising:

[0019] The housing is provided with an opening;

[0020] A battery cell, disposed in the housing;

[0021] A top cover, which is buckled with the open opening of the shell, wherein the top cover has an outer surface facing the outside of the shell and an inner surface facing the inside of the shell, and the top cover is provided with a liquid injection port connecting the outer surface and the inner surface;

[0022] The said injection port sealing glue nail, the said glue nail body is installed at the said injection port, the outer side surface of the said glue nail body is completely in contact with the inner wall of the said injection port, the said first end surface faces the outside of the said shell, and the said second end surface faces the inside of the said shell and is connected with the said shell cavity;

[0023] A sealing metal nail is welded to one end of the liquid injection port close to the first end surface.

[0024] Furthermore, the injection port includes a second large-aperture channel and a second small-aperture channel, the second large-aperture channel and the second small-aperture channel are interconnected to form a step hole, the step surface of the injection port faces the first direction, the sealing glue nail is arranged in the second small-aperture channel of the step hole, and the sealing metal nail is arranged in the second large-aperture channel of the step hole. When the closure is in a closed state, the closure and the sealing metal nail are spaced a certain distance apart.

[0025] Furthermore, the first end surface of the glue nail body is protruding relative to the step surface of the liquid injection port.

[0026] The above technical solution of the utility model has the following advantages compared with the prior art:

[0027] 1) The sealing nail and battery of the liquid injection port described in the utility model, by arranging a channel and a closure member on the nail body, the closure member can open and close the channel. When the sealing metal nail is welded to the liquid injection port, the negative pressure outside the battery shell is less than the set value, the closure member will not be subjected to the force in the first direction, the closure member will close the channel to prevent the helium inside the battery from leaking. When the liquid injection port is subjected to helium inspection, the negative pressure outside the battery is greater than the set value. If there is a leak at the connection between the sealing metal nail and the liquid injection port, the negative pressure outside the battery will enter the liquid injection port through the leak between the sealing metal nail and the liquid injection port, thereby acting on the closure member, causing the closure member to move in the first direction and open the channel, so that the helium inside the battery reaches the outside of the battery through the channel and the liquid injection port, and whether there is a leak in the sealing metal nail of the liquid injection port can be detected;

[0028] 2) The sealing nail and battery of the liquid injection port described in the utility model, the closure member includes a sealing portion and an elastic expansion portion. When the sealing metal nail is welded to the liquid injection port, the negative pressure outside the battery is less than the set value, and the elastic expansion portion applies an elastic reset force toward the second direction to the closure member. The sealing portion is tightly pressed against the pore under the reset force of the elastic expansion portion, and the sealing portion reliably closes the pore to prevent helium leakage inside the battery. When the liquid injection port is subjected to helium inspection, the negative pressure outside the battery is greater than the set value. If there is a leakage at the connection between the sealing metal nail and the liquid injection port, the negative pressure outside the battery will enter the liquid injection port through the leakage between the sealing metal nail and the liquid injection port, thereby acting on the closure member. The negative pressure suction force causes the closure member to overcome the elastic reset force of the elastic expansion portion and move in the first direction and open the pore, so that the helium inside the battery reaches the outside of the battery through the pore and the liquid injection port. By setting the elastic expansion portion, the closure member can reliably seal the pore of the nail body when in the closed state.

[0029] 3) The sealing nail for the liquid injection port and the battery described in the utility model, the sealing member also includes a support portion, the support portion is provided with a through hole, the elastic telescopic portion connects the support portion and the blocking portion, the setting of the support member facilitates the connection between the entire sealing member and the nail body, and can prevent the sealing nail from deforming under the action of external force, and plays a role of fixed support;

[0030] 4) The liquid injection port sealing nail and battery described in the utility model have a stepped hole, and the stepped surface of the hole facilitates the positioning of the blocking part, so that the blocking part can reliably block the hole;

[0031] 5) The liquid injection port sealing nail and battery described in the utility model have a plurality of through holes evenly distributed on the support part around the center thereof, so that the center position of the support part can be connected to the elastic telescopic part, and the plurality of through holes allow helium to pass through;

[0032] 6) The liquid injection port sealing nail and battery described in the utility model, the support part is arranged on the second direction side of the blocking part, and the elastic telescopic part can be stretched and deformed, so that when the sealing nail is assembled, it is convenient to observe the contact between the blocking part and the channel from the first direction side of the blocking part;

[0033] 7) The sealing nail and battery of the liquid injection port described in the utility model, the sealing piece is an integrated structure of rubber material, and the sealing piece is easy to connect and install with the nail body;

[0034] 8) The liquid injection port sealing nail and battery described in the utility model, the liquid injection port is a stepped hole, and the stepped surface of the liquid injection port facilitates the positioning of the sealing metal nail, so that the sealing metal nail can reliably block the liquid injection port;

[0035] 9) The liquid injection port sealing nail and battery described in the utility model, when the sealing nail and the liquid injection port generate friction, the interference fit between the sealing nail and the liquid injection port may become a clearance fit. The sealing nail has a certain margin, and when the sealing nail falls, the excess part can re-form an interference fit with the liquid injection port to avoid the possibility of the sealing nail falling into the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to make the content of the utility model more clearly understood, the utility model is further described in detail below based on specific embodiments of the utility model in combination with the accompanying drawings.

[0037] Figure 1 It is a structural schematic diagram of the liquid injection port sealing glue nail structure disclosed in the utility model;

[0038] Figure 2 It is a structural schematic diagram of the liquid injection port disclosed in the utility model;

[0039] Figure 3 The utility model is a schematic diagram of the connection between the liquid injection port sealing nail structure and the liquid injection port.

[0040] Explanation of the reference numerals in the drawings in the specification: 1. Sealing nail; 11. Nail body; 111. Outer side surface; 112. First end surface; 113. Second end surface; 12. Channel; 121. First large-aperture channel; 122. First small-aperture channel; 13. Closure; 131. Sealing portion; 132. Elastic expansion portion; 133. Support portion; 1331. Through hole; 2. Top cover; 21. Liquid injection port; 211. Second large-aperture channel; 212. Second small-aperture channel; 3. Sealing metal nail. DETAILED DESCRIPTION

[0041] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0042] Embodiment 1

[0043] See also Figure 1 and Figure 2 Shown is an embodiment of a liquid injection port sealing nail.

[0044] A liquid injection port sealing nail comprises a nail body 11, wherein the nail body 11 is columnar and has an outer side surface 111, a first end surface 112 and a second end surface 113, wherein the outer side surface 111 is used to completely fit with the inner wall of the liquid injection port 21, and the first end surface 112 and the second end surface 113 are arranged opposite to each other and face a first direction and a second direction respectively.

[0045] The nail body 11 is provided with a hole 12 connecting the first end face 112 and the second end face 113, one end of the hole 12 facing the second direction is connected with the cavity of the battery housing, and the other end of the hole 12 facing the first direction is provided with a sealing member 13;

[0046] The closure member 13 has a closed state and an open state;

[0047] When the sealing member 13 is in a closed state, the sealing member 13 abuts against the nail body 11 and blocks the hole 12;

[0048] When the sealing member 13 is in the open state, the sealing member 13 is separated from the nail body 11 along the first direction and the hole 12 is opened.

[0049] The above-mentioned nail body 11 is made of rubber with elastic properties. The above-mentioned nail body 11 is equivalent to a plug that can block the injection port 21. The outer side surface of the nail body 11 and the inner wall of the injection port 21 are completely fitted, which means that there is no gap between the two, and no gas will leak out from between the nail body 11 and the injection port 21. Generally speaking, in order to ensure that the nail body 11 and the injection port 21 are completely fitted, the diameter of the nail body 11 is slightly larger than the diameter of the injection port 21 to ensure that both sides are interference fit, to ensure that the helium in the battery shell will not volatilize, and to prevent the sealing nail 1 from falling into the battery.

[0050] The above-mentioned closure 13 can open and close the channel 12. When the sealing metal nail is welded to the injection port 21, the negative pressure outside the battery shell is less than the set value, and the closure 13 will not be subjected to the force in the first direction. The closure 13 will close the channel 12 to prevent the helium inside the battery shell from leaking. When the injection port 21 is subjected to helium inspection, the negative pressure outside the battery shell is greater than the set value. If there is a leak at the connection between the sealing metal nail 3 and the injection port 21, the negative pressure outside the battery will enter the injection port 21 through the leakage between the sealing metal nail 3 and the injection port 21, thereby acting on the closure 13, causing the closure 13 to move in the first direction and open the channel 12, so that the helium inside the battery shell reaches the outside of the battery shell through the channel 12 and the injection port 21.

[0051] Through the above technical solution, it is possible to detect whether the sealing metal nail 3 of the liquid injection port 21 is leaking.

[0052] In this embodiment, the sealing member 13 includes a blocking portion 131 and an elastically retractable portion 132. The blocking portion 131 is used to close or open the hole 12. The elastically retractable portion 132 is located inside the hole 12 and is used to apply an elastic restoring force toward the second direction to the blocking portion 131.

[0053] When the sealing member 13 is in a closed state, the deformation amount of the elastic expansion portion 132 is ΔL1, and the blocking portion 131 abuts against the nail body 11 and blocks the hole 12;

[0054] When the sealing member 13 is in the open state, the deformation amount of the elastic expansion portion 132 is ΔL2, and the blocking portion 131 is separated from the nail body 11 along the first direction and opens the hole 12;

[0055] ΔL2 is greater than ΔL1.

[0056] The blocking portion 131 is fixed to the end surface of the channel 12 under the action of its own gravity and the pulling force of the elastic expansion portion 132 . The blocking portion 131 can completely cover the channel 12 to prevent the helium from volatilizing too quickly. When the sealing metal nail 3 is welded to the injection port 21, the negative pressure outside the battery shell is less than the set value, and the elastic telescopic part 132 applies an elastic reset force in the second direction to the blocking part 131. The blocking part 131 is tightly pressed against the channel 12 under the reset force of the elastic telescopic part 132, and the blocking part 131 reliably closes the channel 12 to prevent helium leakage inside the battery shell. When the injection port 21 is subjected to helium inspection, the negative pressure outside the battery shell is greater than the set value. If there is a leak at the connection between the sealing metal nail 3 and the injection port 21, the negative pressure outside the battery will enter the injection port 21 through the leakage between the sealing metal nail 3 and the injection port 21, thereby acting on the closure 13. The negative pressure suction force causes the blocking part 131 to overcome the elastic reset force of the elastic telescopic part 132 and move in the first direction and open the channel 12, so that the helium inside the battery shell reaches the outside of the battery shell through the channel 12 and the injection port 21.

[0057] Through the above technical solution, the sealing member 13 can reliably seal the hole 12 of the nail body 11 when in the closed state.

[0058] In this embodiment, the above-mentioned closing member 13 also includes a supporting portion 133, and the above-mentioned supporting portion 133 is connected to the inner wall of the above-mentioned channel 12. The above-mentioned supporting portion 133 has a first surface facing the above-mentioned first direction, a second surface facing the above-mentioned second direction, and a through hole 1331 connecting the first surface and the second surface of the above-mentioned supporting portion 133, and the two ends of the above-mentioned elastic telescopic portion 132 are respectively connected to the first surface of the above-mentioned supporting portion 133 and the above-mentioned blocking portion 131.

[0059] According to the above technical solution, a support portion 133 is provided in the channel 12 , the support portion 133 is provided with a through hole 1331 , and the elastic telescopic portion 132 connects the support portion 133 and the blocking portion 131 , so as to facilitate the connection of the elastic telescopic portion 132 .

[0060] In other embodiments, the supporting portion is not included, and the elastic telescopic portion is connected to the nail body.

[0061] In the present embodiment, the above-mentioned channel 12 includes a first large-aperture channel 121 and a first small-aperture channel 122, and the above-mentioned first large-aperture channel 121 and the above-mentioned first small-aperture channel 122 are interconnected to form a step hole, and the step surface of the above-mentioned step hole faces the above-mentioned first direction. When the above-mentioned closing member 13 is in a closed state, the above-mentioned blocking portion 131 is arranged in the first large-aperture channel 121 of the above-mentioned step hole and abuts on the step surface of the above-mentioned step hole, and the above-mentioned supporting portion 133 is arranged in the first small-aperture channel 122 of the above-mentioned step hole, and the outer wall of the above-mentioned supporting portion 133 abuts against the inner wall of the above-mentioned first small-aperture channel 122.

[0062] The above-mentioned step hole refers to a plurality of holes of different diameters connected coaxially, which are generally produced in the drilling process. In the production process, it is necessary to first drill a through hole with a small drill bit, and then drill a semi-through hole with a large drill bit. The above-mentioned semi-through hole is the first largest aperture channel of the channel, and the annular bottom of the semi-through hole is the step surface of the step hole. The remaining through holes are the first small aperture channels of the channel, and the orifice of the large hole faces the same direction as the step surface.

[0063] Through the above technical solution: the positioning of the blocking portion 131 is facilitated, so that the blocking portion 131 can reliably block the channel 12.

[0064] In other embodiments, the hole may be a straight hole, and the blocking portion is arranged to protrude relative to the hole opening end surface of the hole.

[0065] In this embodiment, the elastic telescopic portion 132 is connected to the center of the support portion 133 , and the support portion 133 is provided with a plurality of through holes 1331 evenly distributed around the center thereof.

[0066] According to the above technical solution: a support portion 133 is provided in the channel 12, and a through hole 1331 is provided in the support portion 133.

[0067] Through the above technical solution: a plurality of through holes 1331 are evenly distributed on the support part 133 around the center thereof, so that the center position of the support part 133 can be connected to the elastic telescopic part 132, and the plurality of through holes 1331 ensure smooth passage of helium.

[0068] In other embodiments, the elastic telescopic portion may be connected to an eccentric position of the supporting portion, and the through hole is provided at a central position of the supporting portion.

[0069] In this embodiment, the supporting portion 133 is arranged on the second direction side of the blocking portion 131, and the length of the elastic retractable portion 132 in a natural state is L1. When the closing piece 13 is in a closed state, the length of the elastic retractable portion 132 is L2. When the closing piece 13 is in an open state, the length of the elastic retractable portion 132 is L3. L1, L2 and L3 increase sequentially.

[0070] Through the above technical solution, the elastic telescopic portion 132 is stretched and deformed, so that the elastic telescopic portion 132 is arranged on the second direction side of the blocking portion 131 and can be hidden in the channel 12 .

[0071] In other embodiments, the supporting portion may be arranged on the first direction side of the blocking portion, and L1, L2 and L3 decrease in sequence.

[0072] In this embodiment, the blocking portion 131 , the elastically retractable portion 132 and the supporting portion 133 are an integrated structure made of rubber material.

[0073] The blocking portion 131 , the elastic and retractable portion 132 and the supporting portion 133 are an integrated structure of rubber material, which means that they are made into corresponding shapes by injection molding.

[0074] Through the above technical solution, the above-mentioned closing piece 13 has high manufacturing efficiency, good performance and low cost, and is convenient for connecting the closing piece 13 with the nail body 11.

[0075] In other embodiments, the blocking portion, the elastic telescopic portion and the supporting portion may be manufactured separately and connected in other ways later.

[0076] See also Figures 1 to 3 As shown, an embodiment of the battery of the utility model comprises:

[0077] The housing is provided with an opening;

[0078] A battery cell, arranged in the above-mentioned casing;

[0079] A top cover 2, which is buckled with the open mouth of the shell, the top cover 2 has an outer surface facing the outside of the shell and an inner surface facing the inside of the shell, and the top cover 2 is provided with a liquid injection port 21 connecting the outer surface and the inner surface;

[0080] The above-mentioned injection port sealing nail 1, the above-mentioned nail body 11 is installed on the above-mentioned injection port 21, the outer side surface 111 of the above-mentioned nail body 11 is completely in contact with the inner wall of the above-mentioned injection port 21, the above-mentioned first end surface 112 faces the outside of the above-mentioned shell, and the above-mentioned second end surface 113 faces the inside of the above-mentioned shell and is connected with the above-mentioned shell cavity;

[0081] The sealing metal nail 3 is welded to one end of the liquid injection port 21 close to the first end surface 112 .

[0082] After the battery has completed the last liquid injection and a certain amount of helium has been injected, the pre-assembled sealing nail 1 is pressed into the liquid injection port 21 through the nail pressing rod. At this time, the sealing portion 131 is subjected to its own gravity and the pulling force of the elastic telescopic portion 132, and the lower surface of the sealing portion 131 will fit on the step surface of the channel 12. The fit between the sealing portion 131 and the step surface of the channel 12 can prevent the helium from volatilizing too quickly during the process of the battery being moved to the sealing metal nail welding process after the helium is injected. At the same time, it can also prevent the electrolyte inside the battery from leaking into the liquid injection port, avoiding defects such as welding explosion points of the sealing metal nail 3.

[0083] After the battery is welded with the sealing metal nail 3, the battery will be placed in a closed cavity, and the entire cavity will be evacuated to put the battery in a negative pressure state. If the welding of the sealing metal nail 3 of the battery to be tested is defective, a strong negative pressure will enter the liquid injection port 21 through the defective part, so that the inside of the liquid injection port 21 is also in a negative pressure state, but the inside of the battery is still in a normal atmospheric pressure state. At this time, affected by the internal and external pressures, the negative pressure in the liquid injection port 21 and the positive pressure inside the battery will force the blocking part 131 to float upward, so that the helium gas passes through the four through holes 1331 opened on the internal support part 133 of the sealing nail 1 to the bottom of the blocking part 131, and then evaporates into the liquid injection port 21 through the gap between the blocking part 131 and the step surface in the channel 12, and evaporates into the closed cavity through the defective part of the sealing metal nail 3 welding, and then uses a helium detector to detect whether there is helium leakage, so that the purpose of detecting whether the sealing metal nail welding is defective can be effectively achieved, and the risk of battery leakage in subsequent use can be eliminated.

[0084] During the battery helium test, if the sealing metal nail 3 and the liquid injection port 21 are welded properly and no helium flows out from the hole 12 and the weld, the sealing portion 131 is pulled by the elastic expansion portion 132 so that the sealing member 13 is in a closed state;

[0085] If the sealing metal nail 3 is not well welded to the liquid injection port 21, helium will flow out from the channel 12 and the weld under the negative pressure. At this time, the negative pressure is greater than the pulling force of the elastic expansion part 132, so that the closure 13 is in an open state.

[0086] Through the above technical solution: when the sealing metal nail 3 is welded, the sealing glue nail 1 closes the channel 12, and the helium inside the battery will not leak out; when the sealing metal nail 3 is leaked, if the sealing metal nail 3 leaks, the sealing glue nail 1 will open the channel 12, and the helium inside the battery will leak out, thereby being able to detect whether there is a leak in the welding of the sealing metal nail 3 of the filling port 21.

[0087] In this embodiment, the above-mentioned liquid injection port 21 includes a second large-aperture channel 211 and a second small-aperture channel 212. The above-mentioned second large-aperture channel 211 and the above-mentioned second small-aperture channel 212 are interconnected to form a step hole, and the step surface of the above-mentioned step hole faces the above-mentioned first direction. The above-mentioned sealing glue nail 1 is arranged in the second small-aperture channel 212 of the above-mentioned step hole, and the above-mentioned sealing metal nail 3 is arranged in the second large-aperture channel 211 of the above-mentioned step hole. When the above-mentioned closing piece 13 is in a closed state, the above-mentioned closing piece 13 and the above-mentioned sealing metal nail 3 are spaced a certain distance apart.

[0088] The above-mentioned stepped hole refers to a plurality of holes of different diameters connected coaxially, which are generally produced in the drilling process. In the production process, it is necessary to first drill a through hole with a small drill bit, and then drill a semi-through hole with a large drill bit. The above-mentioned semi-through hole is the second largest aperture channel of the injection port 21, and the annular bottom of the semi-through hole is the step surface of the injection port 21. The remaining through holes are the second small aperture channels of the injection port 21, and the second largest aperture channel opening of the injection port 21 and the step surface of the injection port 21 face the same direction.

[0089] Through the above technical solution, the step surface of the liquid injection port 21 facilitates the positioning of the sealing metal nail 3 , so that the sealing metal nail 3 can reliably seal the liquid injection port 21 .

[0090] In other embodiments, the liquid injection port may be a straight hole, and the sealing metal nail may be arranged to protrude relative to the end surface of the hole of the liquid injection port.

[0091] In this embodiment, the first end surface 112 of the nail body 11 is protruding relative to the step surface of the liquid injection port 21 .

[0092] The protruding setting of the first end face 112 of the above-mentioned glue nail body 11 relative to the step surface of the above-mentioned liquid injection port 21 means that a section of the above-mentioned glue nail body 11 close to the first end face extends out of the step surface of the liquid injection port 21. The glue nail body 11 and the liquid injection port 21 are initially interference fit. Due to the influence of long-term friction, the glue nail body 11 and the liquid injection port 21 will become a clearance fit. At this time, the glue nail body 11 has a tendency to move in the second direction, which will cause a section of the glue nail body 11 extending out of the liquid injection port 21 to enter the liquid injection port 21, and re-form an interference fit with the liquid injection port 21.

[0093] Through the above technical solution: the possibility of the sealing nail 1 falling into the battery is avoided.

[0094] In other embodiments, the first end surface of the above-mentioned glue nail body may be flush with or recessed with the step surface of the above-mentioned liquid injection port.

[0095] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A liquid injection port sealing nail, Features: The invention comprises a glue nail body (11), wherein the glue nail body (11) is columnar and has an outer side surface (111), a first end surface (112) and a second end surface (113), wherein the outer side surface (111) is used to completely fit with the inner wall of the liquid injection port (21), and the first end surface (112) and the second end surface (113) are arranged opposite to each other and face a first direction and a second direction respectively. The nail body (11) is provided with a hole (12) connecting the first end surface (112) and the second end surface (113); one end of the hole (12) facing the second direction is connected to the cavity of the battery housing; and the other end of the hole (12) facing the first direction is provided with a sealing member (13); The closure member (13) has a closed state and an open state; When the closing member (13) is in a closed state, the closing member (13) abuts against the nail body (11) and blocks the hole (12); When the closing piece (13) is in an open state, the closing piece (13) is separated from the nail body (11) along the first direction and opens the hole (12).

2. The liquid injection port sealing nail according to claim 1, It is characterized in that The closing member (13) comprises a blocking portion (131) and an elastically retractable portion (132), wherein the blocking portion (131) is used to close or open the hole (12), and the elastically retractable portion (132) is located inside the hole (12) and is used to apply an elastic restoring force toward the second direction to the blocking portion (131); When the closure member (13) is in a closed state, the deformation amount of the elastic telescopic portion (132) is ΔL1, and the blocking portion (131) abuts against the nail body (11) and blocks the hole (12); When the closing member (13) is in an open state, the deformation amount of the elastic telescopic portion (132) is ΔL2, and the blocking portion (131) is separated from the nail body (11) along the first direction and opens the hole (12); ΔL2 is greater than ΔL1.

3. The liquid injection port sealing nail according to claim 2, It is characterized in that The closure member (13) further comprises a supporting portion (133), wherein the supporting portion (133) is connected to the inner wall of the channel (12), wherein the supporting portion (133) comprises a first surface facing the first direction, a second surface facing the second direction, and a through hole (1331) connecting the first surface and the second surface of the supporting portion (133), and the two ends of the elastically retractable portion (132) are respectively connected to the first surface of the supporting portion (133) and the blocking portion (131).

4. The liquid injection port sealing nail according to claim 3, It is characterized in that The hole (12) comprises a first large-aperture channel (121) and a first small-aperture channel (122); the first large-aperture channel (121) and the first small-aperture channel (122) are connected to each other to form a step hole; the step surface of the step hole faces the first direction; when the sealing member (13) is in a closed state, the blocking portion (131) is arranged in the first large-aperture channel (121) of the step hole and abuts against the step surface of the step hole; the supporting portion (133) is arranged in the first small-aperture channel (122) of the step hole, and the outer wall of the supporting portion (133) abuts against the inner wall of the first small-aperture channel (122).

5. The liquid injection port sealing nail according to claim 3, It is characterized in that The elastic telescopic portion (132) is connected to the central position of the supporting portion (133), and the supporting portion (133) is provided with a plurality of through holes (1331) evenly distributed around the center thereof.

6. The liquid injection port sealing nail according to claim 3, It is characterized in that The supporting portion (133) is arranged on the second direction side of the blocking portion (131); the length of the elastically retractable portion (132) in a natural state is L1; when the sealing member (13) is in a closed state, the length of the elastically retractable portion (132) is L2; ​​when the sealing member (13) is in an open state, the length of the elastically retractable portion (132) is L3; L1, L2 and L3 increase in sequence.

7. The liquid injection port sealing nail according to claim 3, It is characterized in that The blocking portion (131), the elastic telescopic portion (132) and the supporting portion (133) are an integrated structure made of rubber material.

8. A battery, It is characterized in that include: shell; With an open mouth; A battery cell, disposed in the housing; A top cover (2) is buckled with the open opening of the outer shell, the top cover (2) has an outer surface facing the outside of the outer shell and an inner surface facing the inside of the outer shell, and the top cover (2) is provided with a liquid injection port (21) connecting the outer surface and the inner surface; The liquid injection port sealing nail (1) according to any one of claims 1 to 7, wherein the nail body (11) is installed on the liquid injection port (21), the outer side surface (111) of the nail body (11) is completely in contact with the inner wall of the liquid injection port (21), the first end surface (112) faces the outside of the shell, and the second end surface (113) faces the inside of the shell and is connected to the shell cavity; A sealing metal nail (3), wherein the sealing metal nail (3) is welded to one end of the liquid injection port (21) close to the first end surface (112).

9. The battery according to claim 8, It is characterized in that The injection port (21) comprises a second large-aperture channel (211) and a second small-aperture channel (212); the second large-aperture channel (211) and the second small-aperture channel (212) are connected to each other to form a stepped hole; the stepped surface of the injection port (21) faces the first direction; the sealing glue nail (1) is arranged in the second small-aperture channel (212) of the stepped hole; the sealing metal nail (3) is arranged in the second large-aperture channel (211) of the stepped hole; when the closing member (13) is in a closed state, a certain distance is spaced between the closing member (13) and the sealing metal nail (3).

10. The battery according to claim 9, It is characterized in that The first end surface (112) of the glue nail body (11) is arranged to protrude relative to the step surface of the liquid injection port (21).

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