Sealing rubber nail capable of escaping helium, battery cover plate and battery

Abstract

The utility model discloses a sealing rubber nail capable of escaping helium, a battery cover plate and a battery, the sealing rubber nail comprises a sealing rubber nail body, a helium escape channel is arranged in the center of the sealing rubber nail body, the outlet position of the helium escape channel is connected with a movable sealing rubber sheet, and the helium escape channel is connected with the movable sealing rubber sheet. The movable sealing film is partially connected with the wall surface of the helium escape channel, and the movable sealing film can be opened upwards under the action of negative pressure suction force; according to the utility model, the helium escape channel is arranged at the central position of the sealing rubber nail, a solid rubber nail is changed into the hollow sealing rubber nail, and meanwhile, the movable sealing rubber sheet is additionally arranged at the upper end of the helium escape channel in the sealing rubber nail to isolate the risk that foreign matters enter the battery cell; the sealing film is opened upwards through negative pressure suction force, it is guaranteed that helium molecules in the battery can escape out of the battery in the helium detection process, and the accuracy of the detection result is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery manufacturing, and in particular relates to a sealing nail capable of escaping helium, a battery cover and a battery. Background Art

[0002] The statements herein merely provide background art related to the present invention and do not necessarily constitute prior art.

[0003] During the lithium battery manufacturing process, after the secondary liquid filling of the battery is completed, the liquid filling hole of the battery shell needs to be sealed. Before sealing, a certain amount of helium or other special gas needs to be injected into the battery so that after the sealing is completed, the battery's sealing can be tested by detecting whether there is gas leakage at the liquid filling hole of the battery.

[0004] After the battery is filled, a certain amount of helium is injected into the battery, and then a sealing nail is inserted. The sealing nail prevents electrolyte leakage and helium molecules from escaping when the sealing nail is not welded. At the same time, the sealing nail prevents welding slag from falling into the battery. The sealing nail cap is then laser welded. After welding, the battery enters the negative pressure helium inspection process to detect the welding effect. The existing sealing nail and the liquid injection hole have an interference fit, which blocks the liquid injection hole. The helium molecules inside the battery cannot effectively escape from the poorly welded area. Even if there is a problem with the welding of the metal sealing cover, the helium inspection equipment will still determine that the problem battery is qualified, resulting in the poor sealing nail welding not being able to effectively pass the helium inspection. However, when there is a problem with the welding of the metal sealing cover, and the liquid injection hole is sealed by the sealing nail alone, the sealing nail of the problem battery can easily loosen during long-term transportation and use, causing the liquid injection hole to leak, posing a major safety hazard to the battery.

[0005] In the prior art, Chinese utility model patent CN220797035U discloses a sealing nail, a battery cover, and a battery. By setting a helium-conducting channel in the sealing nail, the helium stored in the sealing nail can be effectively detected when poor welding of the sealing aluminum sheet occurs. However, due to the small size of the sealing nail, the amount of helium stored in the sealing nail is very small, and there is a problem of inaccurate detection results; at the same time, the aperture of the channel in the sealing nail is very small. Once the channel is blocked, the accuracy of the detection result cannot be guaranteed; in addition, the sealing nail is made of a sealing colloid and has a certain elasticity. If too many helium channels are set in the sealing nail, the sealing colloid is prone to deformation, and a good sealing effect cannot be achieved. Utility Model Content

[0006] The utility model aims to provide a sealing nail, a battery cover and a battery that can escape helium, which can ensure that the helium inside the battery can escape from the inside of the battery during helium testing, thereby improving the accuracy of the test results.

[0007] In order to achieve the above purpose, the present invention is implemented through the following technical solutions:

[0008] In the first aspect, an embodiment of the present utility model provides a sealing nail that can escape helium, including a sealing nail body, a helium escape channel is provided at the center position of the sealing nail body, the outlet position of the helium escape channel is connected to a movable sealing film, and the movable sealing film is connected to the wall portion of the helium escape channel. Under the action of negative pressure suction, the movable sealing film can open upward.

[0009] As a further technical solution, the helium escape channel includes a circular channel at the bottom and a quadrilateral channel at the top, and the cross-section of the helium escape channel is T-shaped.

[0010] As a further technical solution, the movable sealing rubber sheet is a quadrilateral sealing rubber sheet that matches the cross-sectional size of the quadrilateral channel.

[0011] As a further technical solution, one side of the movable sealing film is fixedly connected to the wall of the quadrilateral channel, and the other three sides are not connected to the wall of the quadrilateral channel.

[0012] As a further technical solution, the sealing nail body includes a guide portion, a sealing portion and a cap portion that are sequentially connected from bottom to top, and the guide portion, the sealing portion and the cap portion form an integral structure.

[0013] As a further technical solution, the diameter of the sealing portion matches the diameter of the liquid injection hole, the diameter of the guide portion is larger than the diameter of the sealing portion, and the bottom end of the guide portion is provided with a rounded corner.

[0014] As a further technical solution, the diameter of the cap body is larger than the diameter of the liquid injection hole, and the lower surface of the cap body is in contact with the upper surface of the battery cover at the liquid injection hole.

[0015] As a further technical solution, the movable sealing film is located below the uppermost end of the helium escape channel and is separated from the uppermost end of the helium escape channel by a set distance.

[0016] In a second aspect, an embodiment of the present invention provides a battery cover, comprising the sealing nail capable of escaping helium as described in the first aspect, wherein the sealing nail is installed in a liquid injection hole on the battery cover.

[0017] In a third aspect, an embodiment of the present invention provides a battery, comprising the battery cover of the second aspect.

[0018] The beneficial effects of the above embodiments of the present invention are as follows:

[0019] The utility model provides a sealing nail capable of escaping helium, and a helium escape channel is provided at the center of the sealing nail, thereby changing a solid nail into a through-hole sealing nail. At the same time, a movable sealing film is added to the upper end of the helium escape channel in the sealing nail to isolate the risk of foreign matter entering the interior of the battery cell. One side of the movable sealing film is connected to the sealing nail, and the other sides are all disconnected. The sealing film is opened upward by negative pressure suction, ensuring that helium molecules inside the battery can escape from the battery during the helium detection process, thereby ensuring the accuracy of the detection result.

[0020] The helium-escapeable sealant provided by this utility model comprises a guide portion, a sealing portion, and a cap portion, which are sequentially connected from bottom to top. The guide portion provides a primary guiding and positioning function, allowing the sealant to smoothly fit into the injection hole during downward pressing, effectively reducing the risk of the sealant getting stuck. Furthermore, by setting the diameter of the guide portion larger than that of the sealing portion, it acts as a limiter, preventing the sealant from falling out of the injection hole, thereby improving the stability and sealing performance of the sealant installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.

[0022] Figure 1 This is a schematic structural diagram of the sealing nail capable of escaping helium of the present invention;

[0023] Figure 2 This is a top view of the sealing nail capable of escaping helium of the present invention;

[0024] Figure 3 This is a schematic diagram of the utility model of the sealing nail capable of escaping helium being installed on a battery for helium detection.

[0025] The diagram is for illustrative purposes only;

[0026] Among them, 1. Sealing nail body; 101. Helium escape channel; 102. Guide part; 103. Sealing part; 104. Cap body; 2. Movable sealing film; 3. Battery; 301. Battery cover; 302. Liquid injection hole; 4. Poor welding area; 5. Escaped helium molecules; 6. Negative pressure helium detection pipeline; 7. Helium molecules in the battery body. DETAILED DESCRIPTION

[0027] It should be noted that the following detailed descriptions are exemplary and are intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0028] Example 1

[0029] In a typical embodiment of the present invention, Figure 1 and Figure 2 As shown, a sealing nail that can escape helium is provided, including a sealing nail body 1, a helium escape channel 101 is provided at the center of the sealing nail body 1, the outlet of the helium escape channel 101 is connected to a movable sealing film 2, and the movable sealing film 2 is connected to the wall portion of the helium escape channel 101. Under the action of negative pressure suction, the movable sealing film 2 can open upward.

[0030] In this embodiment, the movable sealing film 2 can not only prevent foreign matter from entering the battery, but also ensure that helium molecules can escape from the battery under the action of negative pressure suction during helium testing, thereby ensuring the accuracy of the test results.

[0031] In this embodiment, the helium escape channel 101 includes a lower circular channel and an upper quadrilateral channel, and the cross-section of the helium escape channel is T-shaped. By providing a vertically penetrating channel at the center of the sealant body 1 as a helium escape channel, helium does not need to pass through a complex channel during the escape process, making it easier for helium molecules to escape from the battery. At the same time, the helium escape channel is located at the center of the sealant body. Compared with existing multi-channel configurations, the sealant body is less likely to deform, thus ensuring its sealing effect.

[0032] In this embodiment, the movable sealing film 2 is a quadrilateral sealing film with a cross-sectional size that matches the quadrilateral channel. Furthermore, one side of the movable sealing film 2 is fixedly connected to the wall of the quadrilateral channel, while the remaining three sides are disconnected from the walls of the quadrilateral channel. By connecting one side of the movable sealing film 2 to the wall of the quadrilateral channel and disconnecting the remaining three sides, the movable sealing film 2 can be opened upward under the action of negative pressure suction, allowing helium molecules within the battery to escape from the interior of the battery.

[0033] In this embodiment, the sealing nail body 1 includes a guide portion 102, a sealing portion 103 and a cap portion 104 connected in sequence from bottom to top, and the guide portion 102, the sealing portion 103 and the cap portion 104 form an integrated structure.

[0034] In this embodiment, the diameter of the sealing portion 103 matches the diameter of the injection hole 302. The diameter of the guide portion 102 is larger than the diameter of the sealing portion 103, and the bottom end of the guide portion 102 is rounded. By setting the bottom end of the guide portion 102 with a rounded corner, it can serve as a primary guide and positioning function, allowing the sealant to be smoothly inserted into the injection hole during the downward pressing process, effectively reducing the risk of the sealant getting stuck. At the same time, by setting the diameter of the guide portion larger than the diameter of the sealing portion, it can act as a stopper to prevent the sealant from falling out of the injection hole.

[0035] Furthermore, the diameter of the cap body 104 is larger than the diameter of the liquid injection hole 302, and the lower surface of the cap body 104 is in contact with the upper surface of the battery cover 301 at the liquid injection hole 302. The cap body is provided so that the sealing nail can be engaged with the liquid injection hole.

[0036] In this embodiment, the movable sealing film 2 is located below the uppermost end of the helium escape channel 101 and is separated from the uppermost end of the helium escape channel by a set distance, ensuring that under negative pressure suction, the movable sealing film 2 has a certain upward opening space, thereby ensuring that the movable sealing film can be opened normally to achieve helium escape.

[0037] The working principle of the helium-escapeable sealing nail provided in this embodiment is as follows:

[0038] A helium escape channel 101 is provided at the center of the sealing nail, and the solid nail is changed into a through-hole sealing nail. A movable sealing film 2 is added to the upper end of the helium escape channel 101 in the sealing nail to isolate the risk of foreign matter entering the battery cell. One side of the movable sealing film is connected to the sealing nail, and the other sides are all disconnected. The sealing film opens upward by negative pressure suction, allowing the helium molecules 7 in the battery body to escape from the battery 3. The escaped helium molecules 5 enter the negative pressure helium detection pipeline 6 and pass through the helium detection equipment to complete the detection of the poor welding area 4.

[0039] Example 2

[0040] In a typical embodiment of the present invention, a battery cover is provided, such as Figure 3 As shown, it includes the sealing nail capable of escaping helium as described in Example 1, and the sealing nail body 1 is installed in the injection hole 302 on the battery cover 301.

[0041] Example 3

[0042] In a typical embodiment of the present invention, a battery 3 is provided, which is the battery cover in Example 2.

[0043] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A sealing nail capable of escaping helium, characterized in that: The invention comprises a sealing nail body, wherein a helium escape channel is provided at the center of the sealing nail body, the outlet of the helium escape channel is connected to a movable sealing film, and the movable sealing film is connected to the wall portion of the helium escape channel. Under the action of negative pressure suction, the movable sealing film can be opened upward.

2. The helium-escapeable sealing nail according to claim 1, characterized in that: The helium escape channel includes a circular channel at the bottom and a quadrilateral channel at the top, and the cross section of the helium escape channel is T-shaped.

3. The helium-escapeable sealing nail according to claim 2, characterized in that: The movable sealing rubber sheet is a quadrilateral sealing rubber sheet that matches the cross-section size of the quadrilateral channel.

4. The helium-escapeable sealing nail according to claim 3, characterized in that: One side of the movable sealing film is fixedly connected to the wall surface of the quadrilateral channel, and the other three sides are not connected to the wall surface of the quadrilateral channel.

5. The helium-escapeable sealing nail according to claim 1, characterized in that: The sealing nail body includes a guide portion, a sealing portion and a cap portion which are sequentially connected from bottom to top, and the guide portion, the sealing portion and the cap portion form an integral structure.

6. The helium-escapeable sealing nail according to claim 5, characterized in that: The diameter of the sealing portion matches the diameter of the liquid injection hole, the diameter of the guide portion is larger than the diameter of the sealing portion, and the bottom end of the guide portion is arranged with a rounded corner.

7. The helium-escapeable sealing nail according to claim 5, characterized in that: The diameter of the cap body is larger than the diameter of the liquid injection hole, and the lower surface of the cap body is in contact with the upper surface of the battery cover at the liquid injection hole.

8. The helium-escapeable sealing nail according to claim 1, wherein: The movable sealing film is located below the uppermost end of the helium escape channel and is spaced a set distance from the uppermost end of the helium escape channel.

9. A battery cover, comprising the helium-escapeable sealing nail according to any one of claims 1 to 8, characterized in that: The sealing nail is installed in the injection hole on the battery cover.

10. A battery, characterized in that: Comprising the battery cover as claimed in claim 9.

Images