Square battery cover plate liquid injection hole sealing structure

Abstract

The utility model discloses a sealing structure for a liquid injection hole of a square battery cover plate. The sealing structure comprises a sealing nail arranged in the liquid injection hole and a sealing ring arranged between the sealing nail and the liquid injection hole, the sealing nail is divided into two parts, namely a sealing nail mounting part and a sealing nail screw rod part; an internal thread is arranged in the liquid injection hole; the sealing nail is in threaded connection with the liquid injection hole through the sealing nail screw rod part; the liquid injection hole is provided with a step surface, and a sealing ring is mounted between the sealing nail mounting part and the step surface. According to the sealing structure, the screw part of the sealing nail is interlocked with the internal thread of the liquid injection hole, so that the warping and unevenness of the sealing nail caused by the influence of external force on the sealing nail in the groove of the liquid injection hole are reduced, and the welding yield is improved; meanwhile, the sealing ring is combined for sealing, so that the liquid leakage risk of the sealing nail in the long-term use process is reduced, and the sealing safety of the whole battery shell is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium ion batteries, in particular to a sealing structure for a liquid injection hole of a square battery cover. Background Art

[0002] Lithium-ion batteries are widely used in the fields of power and storage. In the existing battery monomer structure, the battery consists of a shell, a top cover, a sealing nail for the injection hole, and a battery cell assembly inside the shell. After the battery cell is filled with electrolyte, the sealing nail is welded to the injection hole of the top cover plate to ensure the sealing of the battery cell and avoid safety problems caused by electrolyte leakage.

[0003] The conventional structural sealing nail is placed in the groove of the liquid injection hole of the cover plate. When it is welded to the cover plate, there is a certain probability that it will be unevenly placed or warped due to external force, resulting in poor welding and reduced yield rate.

[0004] Conventional structural sealing pins only rely on welding to ensure the sealing of the battery cell. During long-term use, metal fatigue weld failure may occur, resulting in weakened sealing ability, thereby causing the safety risk of battery leakage.

[0005] Therefore, based on the above technical problems, technicians in this field urgently need to develop a sealing structure for the liquid injection hole of a square battery cover. Utility Model Content

[0006] The utility model aims to provide a sealing structure for the injection hole of a square battery cover, which interlocks the screw portion of the sealing pin with the internal thread of the injection hole to reduce the risk of the sealing pin being warped and uneven due to external forces in the groove of the injection hole, thereby improving the welding quality rate; at the same time, a sealing ring is combined with the sealing to reduce the risk of leakage of the sealing pin during long-term use, thereby improving the sealing safety of the entire battery shell.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] The utility model discloses a sealing structure for a liquid injection hole of a square battery cover, which is arranged at the liquid injection hole of the square battery cover. The sealing structure comprises:

[0009] A sealing pin installed in the injection hole; and

[0010] A sealing ring installed between the sealing pin and the injection hole;

[0011] The sealing nail is divided into two parts, namely:

[0012] A sealing nail installation portion and a sealing nail screw portion;

[0013] The injection hole has an internal thread, and the sealing nail is threadedly connected to the injection hole through the sealing nail screw portion;

[0014] The injection hole is provided with a step surface, and the sealing ring is installed between the sealing nail installation part and the step surface.

[0015] Furthermore, the outer peripheral side of the sealing nail installation portion is formed as an inclined surface, and the upper part of the injection hole is formed with an injection hole groove that cooperates with the sealing nail installation portion;

[0016] The inner wall of the upper portion of the injection hole groove is formed as an inclined surface matching the inclined surface of the sealing pin mounting portion.

[0017] Furthermore, the edge of the sealing nail mounting portion is fixed to the battery cover by welding.

[0018] Furthermore, a hexagonal groove or a cross groove is provided at the center of the sealing nail installation portion.

[0019] Furthermore, the battery cover and the sealing nail are both made of metal, and the sealing ring is made of rubber.

[0020] In the above technical solution, the utility model provides a square battery cover liquid injection hole sealing structure, which has the following beneficial effects:

[0021] The sealing structure of the utility model interlocks the screw portion of the sealing pin with the internal thread of the injection hole, thereby reducing the sealing pin from being affected by external forces in the groove of the injection hole, causing the sealing pin to warp and become uneven, thereby improving the welding quality rate; at the same time, the sealing ring is combined with the sealing to reduce the risk of leakage of the sealing pin during long-term use, thereby improving the sealing safety of the entire battery shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present utility model. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 A front view of a sealing structure for a liquid injection hole of a square battery cover disclosed in an embodiment of the present application;

[0024] Figure 2 for Figure 1 Middle AA section view;

[0025] Figure 3 This is an enlarged structural diagram of a square battery cover liquid injection hole sealing structure disclosed in an embodiment of the present application.

[0026] Description of reference numerals:

[0027] 10. Battery cover; 20. Sealing nail;

[0028] 11. injection hole; 12. injection hole groove; 13. step surface;

[0029] 1. Sealing nail installation part; 2. Sealing nail screw part; 3. Sealing ring; 4. Welding area;

[0030] 101. Bevel; 102. Hexagonal socket or cross socket. DETAILED DESCRIPTION

[0031] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0032] See also Figures 1 to 3 As shown;

[0033] This embodiment discloses a sealing structure for a liquid injection hole of a square battery cover, which is arranged at a liquid injection hole 11 of a square battery cover 10. The sealing structure includes:

[0034] A sealing pin 20 installed in the injection hole 11; and

[0035] A sealing ring 3 installed between the sealing pin 20 and the injection hole 11;

[0036] The sealing nail 20 is divided into two parts, namely:

[0037] A sealing nail installation portion 1 and a sealing nail screw portion 2;

[0038] The injection hole 11 has an internal thread, and the sealing nail 20 is threadedly connected to the injection hole 11 through the sealing nail screw part 2;

[0039] The injection hole 11 is provided with a step surface 13 , and a sealing ring 3 is installed between the sealing nail mounting portion 1 and the step surface 13 .

[0040] Specifically, the present embodiment discloses a sealing structure suitable for the injection hole 11 of the square battery cover 10; first, the battery cover 10 is provided with the injection hole 11 and the injection hole groove 12 connected to the injection hole 11; the present embodiment designs a sealing nail 20 that matches the injection hole 11 and the injection hole groove structure, and the sealing nail 20 of the present embodiment is formed with a sealing nail mounting portion 1 and a sealing nail screw portion 2. Among them, the sealing nail screw portion 2 is threadedly connected to the internal thread of the injection hole 11, which can avoid the sealing nail from warping and unequal due to external force after installation, and provide conditions for subsequent welding processes. In addition, a sealing ring 3 is installed between the lower surface of the sealing nail mounting portion 1 of the present embodiment and the injection hole groove 12, and the sealing ring 3 can be compressed, so the sealing ring 3 can further avoid leakage due to long-term use.

[0041] Preferably, the outer peripheral side of the sealing nail mounting portion 1 of the present embodiment is formed as a slope 101, and a liquid injection hole groove 12 cooperating with the sealing nail mounting portion 1 is formed at the upper part of the liquid injection hole 11; the inner wall of the upper part of the liquid injection hole groove 12 is formed as an inclined surface matching the slope 101 of the sealing nail mounting portion 1.

[0042] The outer periphery of the sealing pin installation portion 1 of the present embodiment is provided with an inclined surface 101 which matches the inclined surface of the injection hole groove 12 , and can play a role in positioning and guiding the embedding of the sealing pin 20 during the installation process.

[0043] After installation, the edge of the sealing nail installation part 1 of this embodiment is welded and fixed to the battery cover plate 10. The welding involved in this embodiment is laser welding, and the welding area 4 is located at the edge of the sealing nail installation part 1.

[0044] In order to facilitate the use of tools to screw in the sealing nail 20, a hexagonal groove or a cross groove 102 is provided at the center of the sealing nail installation portion 1 of the present embodiment.

[0045] Preferably, the battery cover 10 and the sealing nail 20 of this embodiment are both made of metal, and the sealing ring 3 is made of rubber.

[0046] In the above technical solution, the utility model provides a square battery cover liquid injection hole sealing structure, which has the following beneficial effects:

[0047] The sealing structure of the utility model interlocks the screw portion of the sealing pin 20 with the internal thread of the injection hole 11, thereby reducing the influence of external forces on the sealing pin 20 in the groove of the injection hole 11, which may cause the sealing pin 20 to warp and become uneven, thereby improving the welding quality rate; at the same time, it is sealed in combination with the sealing ring 3 to reduce the risk of leakage of the sealing pin 20 during long-term use, thereby improving the sealing safety of the entire battery casing.

[0048] The above only describes some exemplary embodiments of the present invention by way of illustration. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A sealing structure for a liquid injection hole of a square battery cover, the sealing structure being arranged at a liquid injection hole (11) of a square battery cover (10), characterized in that: The sealing structure comprises: A sealing pin (20) installed in the liquid injection hole (11); and A sealing ring (3) installed between the sealing pin (20) and the liquid injection hole (11); The sealing nail (20) is divided into two parts, namely: A sealing nail installation portion (1) and a sealing nail screw portion (2); The injection hole (11) has an internal thread, and the sealing nail (20) is threadedly connected to the injection hole (11) through the sealing nail screw portion (2); The injection hole (11) is provided with a stepped surface, and the sealing ring (3) is installed between the sealing nail installation portion (1) and the stepped surface (13).

2. A square battery cover liquid injection hole sealing structure according to claim 1, characterized in that: The outer peripheral side of the sealing nail installation part (1) is formed into an inclined surface (101), and the upper part of the injection hole (11) is formed with an injection hole groove (12) that cooperates with the sealing nail installation part (1); The inner wall of the upper portion of the injection hole groove (12) is formed as an inclined surface matching the inclined surface (101) of the sealing pin mounting portion (1).

3. A sealing structure for a liquid injection hole of a square battery cover according to claim 2, characterized in that: The edge of the sealing nail installation portion (1) is fixed to the battery cover plate (10) by welding.

4. A square battery cover liquid injection hole sealing structure according to claim 1, characterized in that: The center of the sealing nail mounting portion (1) is provided with a hexagonal groove or a cross groove (102).

5. A sealing structure for a liquid injection hole of a square battery cover according to claim 1, characterized in that: The battery cover plate (10) and the sealing nail (20) are both made of metal, and the sealing ring (3) is made of rubber.

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