Cylindrical battery

Abstract

The utility model relates to the technical field of secondary batteries and manufacturing thereof, in particular to a cylindrical battery. The utility model provides a cylindrical battery which comprises a shell, and a through hole is formed in one end of the shell; the pole comprises a first connecting part penetrating through the through hole and a second connecting part located in the shell, the second connecting part can cover the through hole, the first connecting part is fixedly connected with the second connecting part, one end, back to the first connecting part, of the second connecting part is fixedly connected with a current collecting plate, and an insulating sheet is arranged between the current collecting plate and the shell; the nut is provided with a screw hole in threaded connection with the first connecting part, the side wall of the nut is provided with a threaded hole communicated with the screw hole, the jackscrew is in threaded connection with the threaded hole to abut against and fix the first connecting part, and a sealing assembly is arranged among the nut, the pole and the shell. The cylindrical battery provided by the utility model is low in cost, rapid in processing, reliable in battery connection and excellent in electrical performance index, and avoids the condition that the screw is loosened due to vibration, so that the connection between the nut and the pole is firmer.

Description

Technical Field

[0001] The utility model relates to the technical field of secondary batteries and manufacturing thereof, in particular to a cylindrical battery. Background Art

[0002] With the continuous development and deepening of the lithium battery industry, the huge demand in the energy storage field, and the requirements for large-scale and low-cost products, the development of large cylindrical batteries in China is becoming increasingly popular, thanks to the technical advantages of large cylindrical batteries in terms of energy density, charge and discharge rate, internal resistance, etc., as well as the cost potential of mass production. However, the complex structural design leads to many product processing steps and high equipment development costs. The existing technology has a large number of structural parts and complex processing steps. At the same time, after the mechanical riveting of large cylindrical batteries is completed, the screws will vibrate and loosen, resulting in a continuous increase in the internal resistance of the battery, making the battery cell unsafe. This is one of the major problems that hinder the improvement of the pass rate. Utility Model Content

[0003] In response to the technical problems in the prior art such as the large number of structural parts, complex processing steps, and loose mechanical riveting of batteries leading to continuously increasing internal resistance, the utility model provides a cylindrical battery that can be processed quickly and at low cost, has reliable battery connection, and excellent electrical performance indicators. It avoids loosening of screws due to vibration and makes the connection between the nut and the pole more secure.

[0004] The utility model provides a cylindrical battery, comprising: a shell, a through hole is formed at one end of the shell; a pole, the pole comprises a first connecting portion passing through the through hole and a second connecting portion located in the shell, the second connecting portion can cover the through hole, the first connecting portion is fixedly connected to the second connecting portion, an end of the second connecting portion facing away from the first connecting portion is fixedly connected to a current collecting disk, an insulating sheet is provided between the current collecting disk and the shell; a nut, the nut is provided with a screw hole threadedly connected to the first connecting portion, a side wall of the nut is provided with a threaded hole communicating with the screw hole, a top screw is threadedly connected to the threaded hole to abut and fix the first connecting portion, and a sealing assembly is provided between the nut, the pole and the shell.

[0005] Furthermore, the sealing assembly includes a first seal, which is arranged between the first connecting part and the shell; the sealing assembly includes a second seal, which is arranged between the nut and the shell; the sealing assembly includes a third seal, which is arranged between the second connecting part and the shell.

[0006] Furthermore, the first sealing member is fixedly connected to the second sealing member.

[0007] Furthermore, the first sealing component and the second sealing component are designed as one piece.

[0008] Furthermore, the nut is threadedly connected to the first connecting portion and then welded and fixed.

[0009] Furthermore, the top screw is coated with thread fixing glue and then threadedly connected to the threaded hole of the nut.

[0010] The beneficial effects of the present invention are:

[0011] After the collecting plate is fixedly connected to the pole, the insulating sheet and sealing assembly are installed into the shell and tightened. After the nut is threaded into place with the pole, the top screw is tightened on the side of the nut, and the top screw abuts against the fixed pole, increasing the force of fixing the pole in multiple dimensions and improving the battery's ability to resist vibration. In addition, the structural components are simple, the cost is low and the installation is easy.

[0012] The nut and the top of the stud are sealed by laser welding; the top screw is fixed with thread fixing glue to add a double insurance connection to avoid loosening of the screw due to vibration and increase connection reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0014] Figure 1 This is a structural diagram of an embodiment of the present utility model.

[0015] Figure 2 for Figure 1 A partial enlarged view of point A in the middle.

[0016] Explanation of the main reference numerals: 1-shell, 21-first connecting part, 22-second connecting part, 3-collecting plate, 4-nut, 5-insulating sheet, 6-first sealing member, 7-second sealing member, 8-third sealing member, 9-top screw. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0018] like Figure 1 and Figure 2As shown, one embodiment of the present invention provides a cylindrical battery, including a housing 1. The housing 1 is cylindrical and has a through hole formed in the upper portion of the housing 1. The terminal includes a first connecting portion 21 and a second connecting portion 22. The first connecting portion 21 is a threaded stud that extends through the through hole in the housing 1. The projected area of ​​the second connecting portion 22 on the upper side of the housing 1 is larger than the area of ​​the through hole. Therefore, the second connecting portion 22 is located within the housing 1. A third sealing member 8 is provided between the second connecting portion 22 and the housing 1. The third sealing member 8 is made of an insulating material and has an insulating effect. A first sealing member 6 is provided between the first connecting portion 21 and the housing 1 and is made of an insulating material and has both insulating and sealing effects. The first connecting portion 21 and the second connecting portion 22 are integrally formed or fixedly connected. The second connecting portion 22 is welded to the current collecting plate 3. An insulating sheet 5 is provided between the current collecting plate 3 and the housing 1 to separate the current collecting plate 3 and the housing 1 and provide an insulating effect. The nut 4 is threadedly connected to the first connecting portion 21. Tightening the nut 4 fixes the pole to the housing 1. A second seal 7 is provided between the nut 4 and the housing 1. The second seal 7 is made of insulating material and has insulating and sealing effects. A threaded hole is provided on the side wall of the nut 4. The top screw 9 passes through the threaded hole and is threadedly connected to the nut 4. Tightening the top screw 9 into the threaded hole makes the top screw 9 abut against the first connecting portion 21 in the screw hole of the nut 4, thereby fixing the first connecting portion 21.

[0019] The installation process of one embodiment of the present invention is as follows: after the collecting plate 3 is fixedly connected to the pole, the insulating sheet 5 and the sealing assembly are installed into the shell 1 and pressed tightly. After the nut 4 is threaded into place with the pole, the side of the nut 4 is tightened with the top screw 9 coated with thread fixing glue. The top screw 9 abuts against the fixed pole. After completion, the top of the nut 4 and the first connecting part 21 are laser welded and sealed. Add double insurance connection. This embodiment can increase the force of fixing the pole in multiple dimensions, improve the battery's ability to resist vibration, avoid the situation where the screws are loosened due to vibration, and make the connection between the nut 4 and the pole more stable; and the structural components are simple, low cost and easy to install. In a preferred embodiment of the present invention, the first seal 6 and the second seal 7 are integrally formed, the first seal 6 is placed between the first connecting part 21 and the shell 1, and the second seal 7 is located between the nut 4 and the shell 1.

[0020] Although the present invention has been described in detail with reference to the accompanying drawings and in conjunction with preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, persons of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall fall within the scope of the present invention. Any changes or substitutions that can be easily conceived by persons skilled in the art within the technical scope disclosed in the present invention shall fall within the scope of protection of the present invention.

Claims

1. A cylindrical battery, characterized in that: include: A shell, one end of which is provided with a through hole; The pole includes a first connecting portion passing through the through hole and a second connecting portion located in the shell, the second connecting portion can cover the through hole, the first connecting portion and the second connecting portion are fixedly connected, and the end of the second connecting portion facing away from the first connecting portion is fixedly connected to a current collecting disk, and an insulating sheet is provided between the current collecting disk and the shell; The nut is provided with a screw hole threadedly connected to the first connecting part, the side wall of the nut is provided with a threaded hole connected to the screw hole, the top screw is threadedly connected to the threaded hole to abut and fix the first connecting part, and a sealing assembly is provided between the nut, the pole and the shell.

2. A cylindrical battery according to claim 1, characterized in that: The sealing assembly includes a first seal, which is arranged between the first connecting part and the shell; the sealing assembly includes a second seal, which is arranged between the nut and the shell; the sealing assembly includes a third seal, which is arranged between the second connecting part and the shell.

3. A cylindrical battery according to claim 1, characterized in that: The first sealing member is fixedly connected to the second sealing member.

4. A cylindrical battery according to claim 1, characterized in that: The first sealing component and the second sealing component are designed as one piece.

5. A cylindrical battery according to claim 1, characterized in that: The nut is threadedly connected to the first connecting portion and then fixed by welding.

6. A cylindrical battery according to claim 1, characterized in that: The top screw is coated with thread fixing glue and then threadedly connected to the threaded hole of the nut.

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