Sealing type welding nut for battery pack

Abstract

The utility model discloses a sealing type welding nut for a battery pack, which comprises a nut flange arranged at the position of a connecting hole positioned on the inner side of the battery pack, a hollow nut body arranged on the nut flange, a nut sealing head arranged at the bottom of the nut body, and threads arranged on the inner wall of the nut body, and the annular welding leg is arranged on the nut flange between the inner wall of the battery pack and the nut flange. The nut flange, the nut body and the nut sealing head are integrally formed. The annular weld leg seals between the inner wall of the battery pack and the nut flange. The battery pack has the advantages of sealing performance, firm structure, durability and capability of reducing the use cost of the battery pack.

Description

Technical Field

[0001] The utility model relates to the field of automotive battery pack accessories, and particularly to a sealed welding nut for a battery pack. Background Art

[0002] As the main power source of electric vehicles, the automotive battery pack needs to transmit the electric energy in the battery pack to the motor for conversion. Therefore, there must be connector interfaces in the battery pack for power conversion with the outside of the battery pack. Moreover, the temperature of the battery needs to be controlled by a water cooling system inside the battery pack, so water pipe interfaces are required, etc. The battery pack needs to be sealed to ensure no short - circuit occurs, and the connector interfaces must ensure tightness together with the battery pack. Currently, the welding nuts on the market do not have a structure that can ensure tightness, resulting in the current battery packs mainly adopting the combination of riveted nuts and Loctite or the combination of turned - over riveted nuts and structural sealant. However, there are still problems such as the flatness of the installation surface being unstable, resulting in the compression amount of the connector sealing ring being unstable, which affects the tightness of the battery pack; poor manufacturability, and it is necessary to be vertical, non - eccentric, and the riveting force is within the control range to ensure tightness; poor vibration durability. During the long - term driving of the vehicle, problems such as wear and aging of the glue are inevitable, resulting in short - circuit problems caused by the unsealed battery pack; and when applying sealant to the press - riveted nut, due to space limitations, the glue gun cannot enter some areas, and multiple glue applications and airtightness detections are required, increasing the difficulty; also, the riveted nut needs to be deformed without cracking during riveting, so the material strength cannot be very high and the riveting deformation amount cannot be very large, resulting in insufficient connection force. Therefore, the above - mentioned combined structural forms still have defects such as poor production stability, poor fatigue resistance, poor flatness leading to poor tightness, and high cost. Summary of the Utility Model

[0003] In view of the above problems, the purpose of the present utility model is to provide a sealed welding nut for a battery pack with good tightness, a firm and durable structure, and reduced usage cost of the battery pack.

[0004] To achieve the above purpose, a sealed welding nut for a battery pack provided by the present utility model is characterized in that it includes a nut flange provided at the position of the connection hole inside the battery pack, a hollow nut body provided on the nut flange, a nut closing head provided at the bottom of the nut body, threads provided on the inner wall of the nut body, and an annular welding foot provided on the nut flange between the inner wall of the battery pack and the nut flange. The nut flange, the nut body, and the nut closing head are integrally formed. The annular welding foot seals between the inner wall of the battery pack and the nut flange, that is, air leakage is avoided through the integral formation of the circumferential welding foot and the nut body.

[0005] In some embodiments, the nut body is a round tube.

[0006] The beneficial effects of the present utility model are that it has good sealing performance, a firm and durable structure, and can reduce the use cost of the battery pack. Since after the improvement, the nut is connected to the battery pack frame by welding the nut, which does not damage the outer surface of the frame, thus ensuring the flatness of the installation surface; the shape of the welding leg can be reasonably designed so that the entire circle of welding legs can be completely melted and fused with the inner surface of the frame during the welding process; and the two materials are completely fused by the welding method. When the welding width exceeds the material thickness, it can ensure that the connection at this place will not be damaged during the driving of the vehicle; this type of welding nut only requires an ordinary electrode diameter to complete, with little space limitation; the welding nut does not need to be deformed, so the strength of the nut can be made very high, and the connection strength can be ensured by the welding method. In this way, the effects of good sealing performance, a firm and durable structure, and reduced use cost of the battery pack are achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 FIG. 1 is a schematic structural diagram of the present utility model in the use state;

[0008] Figure 2 FIG. 2 is a schematic structural diagram of another perspective of the present utility model in the use state;

[0009] Figure 3 FIG. 3 is a schematic cross-sectional structural diagram of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0010] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0011] As Figures 1-3 shown, a sealed welding nut for a battery pack includes a nut flange 3 provided at the position of a connection hole 2 inside the battery pack 1, a hollow nut body 4 provided on the nut flange 3, a nut closing head 5 provided at the bottom of the nut body 4, a thread 6 provided on the inner wall of the nut body 4, and an annular welding leg 7 provided on the nut flange 3 between the inner wall of the battery pack 1 and the nut flange 3. The nut flange 3 is integrally formed with the nut body 4 and the nut closing head 5. The annular welding leg 7 seals between the inner wall of the battery pack 1 and the nut flange 3, that is, air leakage is avoided by the integral formation of the circumferential welding leg 7 and the nut body 4. The nut body 4 is a round tube.

[0012] After improvement, the nut is connected to the frame of the battery pack 1 by welding the nut, which does not damage the outer surface of the frame, thus ensuring the flatness of the installation surface; the shape of the weld leg can be reasonably designed so that the entire circle of weld legs can be completely melted and fused with the inner surface of the frame during the welding process; and the two materials are completely fused by welding. When the welding width exceeds the material thickness, it can ensure that the connection at this place will not be damaged during the driving of the vehicle; this type of welding nut only requires an ordinary electrode diameter to complete, with little space limitation; the welding nut does not need to be deformed, so the strength of the nut can be very high, and the connection strength can be ensured by welding.

[0013] The above are only some embodiments of the present invention. For those of ordinary skill in the art, without departing from the creative concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention.

Claims

1. A battery pack sealed welding nut, characterized in that: The invention comprises a nut flange provided at the connection hole position on the inner side of the battery pack, a hollow nut body provided on the nut flange, a nut closing head provided at the bottom of the nut body, a thread provided on the inner wall of the nut body, and an annular welding foot provided on the nut flange between the inner wall of the battery pack and the nut flange; The nut flange is integrally formed with the nut body and the nut closing head; The annular welding foot seals between the inner wall of the battery pack and the nut flange.

2. A battery pack sealed welding nut according to claim 1, characterized in that: The nut body is a round tube.

Images