Battery liquid injection hole sealing structure convenient to detect

Abstract

The utility model discloses a battery liquid injection hole sealing structure convenient to detect, which comprises a top cover, a liquid injection hole and a sealing nail, the liquid injection hole and the sealing nail are arranged on the top cover, a countersunk head is arranged on the top cover, the liquid injection hole is arranged at the center of the countersunk head, and the sealing nail is welded in the countersunk head. The sealing nail comprises a middle aluminum wafer and a rubber ring arranged around the middle aluminum wafer, and vent holes are evenly formed in the rubber ring. And a convex hull is arranged at the lower part of the countersunk head. The height of the convex hull is not smaller than the depth of the countersunk head. A pre-pressing sealing rubber nail is omitted, the problem that the efficiency of equipment is reduced due to the fact that the sealing rubber nail is blocked in the conveying process is solved, and the situation that helium cannot flow out from the sealing rubber nail to a leakage point at the welding position of the sealing aluminum nail is avoided; and detection is not facilitated. The helium detection equipment can smoothly detect leaked gas, effectively detect bad batteries, and avoid product safety risks caused by leakage in the later period.

Description

Technical Field

[0001] This utility model relates to the field of battery packaging structure, specifically a battery liquid filling hole sealing structure that is easy to test. Background Technology

[0002] The electrolyte injection port of a square aluminum-cased lithium battery is the only channel for electrolyte to enter the cell after welding around the top cover. After electrolyte injection, the injection port needs to be sealed with sealing aluminum nails. The reliability of the seal is related to the battery's safety performance. Industry testing of seal reliability typically involves pre-filling the casing with a certain amount of helium, pre-sealing with sealing nails after helium injection, inserting the sealing nails after electrolyte injection, and then laser welding the sealing aluminum nails. During laser welding of the sealing aluminum nails, defects such as incomplete welds and bursts often occur due to equipment instability and impurities in the welding area, requiring helium testing to check the weld's sealing performance. Currently, the sealing nail structure used in the market seals the internal helium inside the cell after helium filling and nailing to prevent helium from escaping from the casing during the sealing nail welding process after battery transfer. After pre-sealing, the subsequent process after battery transfer uses laser welding to weld the sealing aluminum nails to the countersunk hole position of the electrolyte injection port. After welding, a second helium test is performed to check the sealing performance. In traditional secondary helium detection methods, even if there are leaks in the sealing aluminum nails, the pre-sealed rubber nails provide a seal, preventing helium from escaping. Therefore, the helium mass spectrometer cannot detect the leaks in the sealing aluminum nails. Furthermore, the rubber nails often become stuck in the transport trough due to burrs, leading to missed insertions and frequent alarms. Utility Model Content

[0003] The purpose of this invention is to provide a battery filling hole sealing structure that is easy to test, thereby solving the problem that existing filling hole sealing structures are inconvenient for helium testing. It eliminates the need for sealing nails, avoiding the problem that secondary helium testing cannot detect the welding reliability of the sealing aluminum nails when they are present.

[0004] To achieve the above objectives, this utility model provides the following technical solution: a battery filling hole sealing structure that is easy to detect, including a top cover, a filling hole and a sealing pin disposed on the top cover, wherein a countersunk head is disposed on the top cover, the filling hole is disposed at the center of the countersunk head, the sealing pin is welded inside the countersunk head, and the sealing pin includes a central aluminum disc and a rubber ring disposed around the central aluminum disc, wherein vent holes are evenly arranged on the rubber ring.

[0005] Preferably, the countersunk head has a bulge at its lower part. The height of the bulge is not less than the depth of the countersunk head. The central aluminum disc is directly welded to the countersunk head surface. Since the countersunk head alone cannot guarantee the structural strength, the downward-facing bulge can improve the structural strength of the weld.

[0006] Preferably, the sealing pin and the countersunk head are interference fit.

[0007] Preferably, the bottom surfaces of the central aluminum disc and the rubber ring are located on the same plane. The central aluminum disc and the rubber ring are connected by adhesive.

[0008] Preferably, the upper surfaces of the central aluminum disc and rubber ring do not exceed the surface of the top cover. This ensures a smooth, unobstructed appearance and maintains an aesthetically pleasing look.

[0009] Preferably, the central aluminum disc has a grooved ring. Welding from the grooved ring reduces welding time and improves processing efficiency.

[0010] Compared with the prior art, the beneficial effects of this utility model are:

[0011] This utility model's convenient battery filling hole sealing structure eliminates the need for pre-pressurized sealing nails, avoiding the problem of reduced equipment efficiency due to blockage of sealing nails during transportation, and preventing helium from flowing out from the sealing nails to the leak point at the aluminum nail weld; thus avoiding the problem of hindering detection. After the aluminum nails of this utility model are welded, since there are no sealing nails for pre-sealing, if there is a leak at the weld point, helium can flow out through the vent, allowing helium testing equipment to easily detect the leaking gas, effectively detecting defective batteries and avoiding product safety risks caused by subsequent leaks. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the helium filling structure of the battery filling hole sealing structure for easy testing according to this utility model;

[0013] Figure 2 This is a schematic diagram of the battery filling hole sealing structure for easy testing according to this utility model.

[0014] Figure 3 This is a schematic diagram of the top cover structure of this utility model;

[0015] Figure 4 This is a cross-sectional view of the sealing nail structure of this utility model;

[0016] Figure 5 This is a top view of the sealing nail structure of this utility model.

[0017] Reference numerals: 1. Top cover; 11. Countersunk head; 12. Protrusion; 2. Injection hole; 3. Sealing pin; 31. Central aluminum disc; 311. Groove ring; 32. Rubber ring; 321. Vent hole. Detailed Implementation

[0018] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0019] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicating orientation or position, are based on the orientation or positional relationships shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] 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.

[0022] like Figures 1 to 5 As shown, the battery filling hole sealing structure of this embodiment, which is easy to detect, includes a top cover 1, a filling hole 2 and a sealing pin 3 disposed on the top cover 1. The top cover 1 is provided with a countersunk head 11, the filling hole 2 is disposed at the center of the countersunk head 11, and the sealing pin 3 is welded inside the countersunk head 11. The sealing pin 3 includes a central aluminum disc 31 and a rubber ring 32 disposed around the central aluminum disc 31. Vent holes 321 are evenly arranged on the rubber ring 32.

[0023] A protrusion 12 is provided at the lower part of the countersunk head 11. The height of the protrusion 12 is not less than the depth of the countersunk head 11.

[0024] The sealing pin 3 and the countersunk head 11 are interference fit.

[0025] The bottom surfaces of the central aluminum disc 31 and the rubber ring 32 are located on the same plane.

[0026] The upper surfaces of the central aluminum disc 31 and the rubber ring 32 do not exceed the surface of the top cover 1.

[0027] A grooved ring 311 is provided on the central aluminum disc 31.

[0028] When using, such as Figure 1 As shown, the sealing nail 3 is transferred above the countersunk head 11, and the sealing nail 3 is pressed to the specified depth using the nail pressing fixture, leaving a gap between the bottom surface of the sealing nail 3 and the countersunk head 11. After the pre-pressing is completed, helium gas is injected into the battery through the vent hole 321 using the helium injection mechanism. After the helium injection is completed, the nail pressing fixture presses the sealing nail 3 in place, eliminating the gap, resulting in the desired shape. Figure 2 As shown in the structure, the rubber ring 32 is in tight contact with the countersunk head 11, preventing helium from escaping. Then, the central aluminum disc 31 is welded to the countersunk head 11 to achieve a seal. If there is a defect in the weld, helium can escape from the defect and simultaneously exit through the vent 321. Helium detection equipment can detect helium leakage to determine if there is a weld defect, thus improving battery safety.

[0029] This utility model eliminates the pre-pressed sealing nail, avoiding the problem of reduced equipment efficiency caused by the sealing nail clogging during the conveying process; eliminating the pre-pressed sealing nail also eliminates the situation in traditional technology where the presence of the sealing nail prevents helium from flowing out from the sealing nail to the leak point at the weld joint, even though there is a leak at the welding position.

[0030] After the sealing nail of this utility model is welded, since there is no sealing glue nail for pre-sealing, if there is a leak at the welding point of the central aluminum disc, helium gas can flow out from the leak point. The helium detection equipment can successfully detect the leaking defective battery, avoiding the product safety risks caused by the leak later.

[0031] The above description is merely an embodiment of this utility model, and common knowledge regarding specific structures and characteristics is not described in detail here. It will be apparent to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this utility model is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A battery filling hole sealing structure that is easy to inspect, comprising a top cover (1), a filling hole (2) disposed on the top cover (1), and a sealing pin (3), wherein a countersunk head (11) is provided on the top cover (1), the filling hole (2) is disposed at the center of the countersunk head (11), and the sealing pin (3) is welded inside the countersunk head (11), characterized in that: The sealing nail (3) includes a central aluminum disc (31) and a rubber ring (32) surrounding the central aluminum disc (31), with vent holes (321) evenly arranged on the rubber ring (32).

2. The battery filling hole sealing structure for easy inspection according to claim 1, characterized in that: The countersunk head (11) has a protrusion (12) at its lower part.

3. The battery filling hole sealing structure for easy inspection according to claim 2, characterized in that: The height of the convex hull (12) is not less than the depth of the countersunk head (11).

4. The battery filling hole sealing structure for easy inspection according to claim 2 or 3, characterized in that: The sealing pin (3) and the countersunk head (11) are interference fit.

5. The battery filling hole sealing structure for easy inspection according to claim 1, characterized in that: The bottom surfaces of the central aluminum disc (31) and the rubber ring (32) are located on the same plane.

6. The battery filling hole sealing structure for easy inspection according to claim 5, characterized in that: The upper surfaces of the central aluminum disc (31) and the rubber ring (32) do not exceed the surface of the top cover (1).

7. The battery filling hole sealing structure for easy inspection according to claim 1, characterized in that: A grooved ring (311) is provided on the central aluminum disc (31).

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