A cylindrical battery sealing die

Abstract

The utility model provides a cylindrical battery sealing die, which belongs to the technical field of cylindrical batteries, and includes a die main body of a hollow cylindrical structure, wherein the die main body includes an upper mounting body and a lower forming body, wherein the upper mounting body is mounted on the upper pressure plate of the sealing machine, and the lower end surface of the lower forming body is provided with a forming groove, wherein the inner contour of the forming groove is adapted to the shape of the battery top cover, and the depth of the forming groove is greater than the sum of the depths of the battery top cover and the battery neck. The utility model provides a cylindrical battery sealing die, which increases the depth of the forming groove, and integrally inserts the battery top cover and the neck into the forming groove, thereby avoiding the different sizes of the upper and lower ends of the neck caused by the shallow forming groove, and at the same time reduces the inner diameter of the forming groove, thereby making the inner diameter of the forming groove adapted to the outer diameter of the battery steel shell, and effectively tightening the outer diameter of the steel shell. After sealing, the outer diameter ratio of the battery is the same as the outer diameter of the battery steel shell, which can efficiently utilize space and avoid problems affecting the capacity design of the battery.

Description

Technical Field

[0001] The utility model belongs to the technical field of cylindrical batteries, and more specifically, relates to a cylindrical battery sealing die. Background Art

[0002] At present, in the production process of cylindrical lithium-ion batteries, pull-down sealing machines are commonly used. Through one, two, and three seals, the upper edge of the battery after rolling grooves is gradually tightened, the steel shell and the cap are sealed, and the total height of the battery is controlled by sealing, so that the battery finally reaches the required size.

[0003] When the existing size sealing mold is used to make batteries, it is affected by the size of the front rolling groove and the tensile deformation of the steel shell, and a slight elliptical shape will appear at the bottom edge of the battery neck. After sealing, the outer diameter of the battery is slightly larger than the outer diameter of the steel shell used, and the space cannot be used efficiently, which indirectly affects the battery capacity design. Utility Model Content

[0004] The utility model aims to provide a cylindrical battery sealing die, aiming to solve the problem that the outer diameter of the battery after sealing is slightly larger than the outer diameter of the steel shell, which cannot efficiently utilize the space and indirectly affects the capacity design of the battery.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide a cylindrical battery sealing mold, including a mold body with a hollow cylindrical structure, the mold body including an upper mounting body and a lower forming body, the upper mounting body is assembled on the upper pressure plate of the sealing machine, the lower end face of the lower forming body has a forming groove, the inner diameter of the forming groove is adapted to the outer diameter of the battery steel shell, and the depth of the forming groove is greater than the sum of the depths of the battery top cover and the battery neck.

[0006] In a possible implementation manner, an outer wall and / or an inner wall of the upper mounting body is provided with mounting threads.

[0007] In a possible implementation manner, the upper mounting body and the lower forming body are formed integrally.

[0008] In a possible implementation manner, the upper mounting body is detachably connected to the lower forming body.

[0009] In a possible implementation, the inner diameter of the molding groove is 15-20 μm smaller than the outer diameter of the battery steel shell.

[0010] In a possible implementation, the depth of the molding groove is 5 mm-8 mm greater than the sum of the depths of the battery top cover and the battery neck.

[0011] In a possible implementation, a transition fillet is provided around the top of the molding groove.

[0012] In a possible implementation, a guiding inclined surface is provided in the circumferential direction of the bottom of the molding groove.

[0013] The beneficial effect of a cylindrical battery sealing mold provided by the utility model is that: compared with the prior art, the upper mounting body is assembled with the upper pressure plate of the sealing machine, and the lower end surface of the lower forming body is provided with a forming groove. Among them, the inner contour of the forming groove is adapted to the shape of the battery top cover, and the depth of the forming groove is greater than the sum of the depths of the battery top cover and the battery neck. The cylindrical battery sealing mold provided by the utility model increases the depth of the forming groove. Through this structure, the battery top cover and the neck are integrally inserted into the forming groove, avoiding the different sizes of the upper and lower ends of the neck caused by the shallow forming groove, and at the same time reducing the inner diameter of the forming groove, so that the inner diameter of the forming groove is adapted to the outer diameter of the battery steel shell, effectively tightening the outer diameter of the steel shell. After sealing, the outer diameter ratio of the battery is the same as the outer diameter of the battery steel shell, which can efficiently utilize space and avoid problems that affect the capacity design of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0015] Figure 1 A schematic structural diagram of a cylindrical battery sealing mold provided by an embodiment of the utility model;

[0016] Figure 2 A schematic structural diagram of a cylindrical battery sealing mold provided in another embodiment of the utility model.

[0017] Description of reference numerals:

[0018] 1. Upper mounting body; 2. Lower forming body; 3. Forming groove; 4. Mounting thread; 5. Transition fillet; 6. Guide slope. DETAILED DESCRIPTION

[0019] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] See also Figure 1 and Figure 2Now, a cylindrical battery sealing mold provided by the utility model is described. A cylindrical battery sealing mold comprises a mold body with a hollow cylindrical structure, the mold body comprises an upper mounting body 1 and a lower forming body 2, the upper mounting body 1 is assembled on the upper pressing plate of the sealing machine, the lower end surface of the lower forming body 2 is provided with a forming groove 3, the inner contour of the forming groove 3 is adapted to the shape of the battery top cover, and the depth of the forming groove 3 is greater than the sum of the depths of the battery top cover and the battery neck.

[0021] The utility model provides a cylindrical battery sealing die. Compared with the prior art, the upper mounting body 1 is assembled with the upper pressure plate of the sealing machine, and the lower end surface of the lower forming body 2 is provided with a forming groove 3. Among them, the inner contour of the forming groove 3 is adapted to the shape of the battery top cover, and the depth of the forming groove 3 is greater than the sum of the depths of the battery top cover and the battery neck. The utility model provides a cylindrical battery sealing die, which increases the depth of the forming groove 3. Through this structure, the battery top cover and the neck are integrally inserted into the forming groove 3, avoiding the different sizes of the upper and lower ends of the neck caused by the shallow forming groove 3. At the same time, the inner diameter of the forming groove 3 is reduced, so that the inner diameter of the forming groove 3 is adapted to the outer diameter of the battery steel shell, effectively tightening the outer diameter of the steel shell. After sealing, the outer diameter ratio of the battery is the same as the outer diameter of the battery steel shell, which can efficiently utilize space and avoid problems that affect the capacity design of the battery.

[0022] The outer wall and / or inner wall of the upper mounting body 1 are provided with mounting threads 4. When the outer wall of the upper mounting body 1 is provided with mounting threads 4, it is convenient to connect and install the upper mounting body 1 with the outer clamp of the upper pressing plate; when the inner wall of the upper mounting body 1 is provided with mounting threads 4, it is convenient to connect and install the upper mounting body 1 with the inner clamp of the upper pressing plate.

[0023] See also Figure 1 The upper mounting body 1 and the lower forming body 2 are integrally formed, and the upper mounting body 1 and the lower forming body 2 are integrally formed, so the structural strength is better.

[0024] See also Figure 2 The upper mounting body 1 and the lower forming body 2 are detachably connected, and the two are detachably mounted through threads, so that different types of lower forming bodies 2 can be easily replaced to adapt to cylindrical batteries of different specifications.

[0025] The inner diameter of the molding groove 3 is 15-20 μm smaller than the outer diameter of the battery steel shell. Through this method, when the battery is inserted into the molding groove 3, the battery neck is tightened to achieve the purpose of controlling the diameter of the battery after sealing, making its diameter the same as the steel shell diameter.

[0026] The depth of the forming groove 3 is 5mm-8mm greater than the sum of the depths of the battery top cover and the battery neck. After the battery is inserted into the forming groove 3, the 5-8mm part below the battery neck can be completely wrapped, avoiding the problem of different sizes of the upper and lower ends of the neck caused by the shallow forming groove 3.

[0027] Among them, a transition fillet 5 is provided on the top circumference of the molding groove 3 to avoid dead corner areas and improve the molding effect.

[0028] A guiding slope 6 is provided around the bottom of the molding groove 3 to prevent the battery from being unable to be correctly inserted into the molding groove 3 due to position offset. The shape of the bottom of the molding groove 3 fits the shape of the battery top cover to prevent the problem of wear of the battery top cover caused by downward pressure of the mold.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A cylindrical battery sealing mold, characterized in that: The mold body comprises a hollow cylindrical structure, wherein the mold body comprises an upper mounting body (1) and a lower forming body (2), wherein the upper mounting body (1) is mounted on an upper pressure plate of a sealing machine, and the lower end surface of the lower forming body (2) is provided with a forming groove (3), wherein the inner diameter of the forming groove (3) is matched with the outer diameter of a battery steel shell, and the depth of the forming groove (3) is greater than the sum of the depths of a battery top cover and a battery neck.

2. A cylindrical battery sealing mold as claimed in claim 1, characterized in that: The outer wall and / or inner wall of the upper mounting body (1) is provided with mounting threads (4).

3. A cylindrical battery sealing mold as claimed in claim 1, characterized in that: The upper mounting body (1) and the lower molding body (2) are integrally molded.

4. A cylindrical battery sealing mold as claimed in claim 1, characterized in that: The upper mounting body (1) and the lower forming body (2) are detachably connected.

5. A cylindrical battery sealing mold as claimed in claim 1, characterized in that: The inner diameter of the molding groove (3) is 15-20 μm smaller than the outer diameter of the battery steel shell.

6. A cylindrical battery sealing mold as claimed in claim 1, characterized in that: The depth of the molding groove (3) is 5 mm to 8 mm greater than the sum of the depths of the battery top cover and the battery neck.

7. A cylindrical battery sealing mold as claimed in claim 1, characterized in that: The top of the molding groove (3) is provided with a transition fillet (5) in the circumferential direction.

8. A cylindrical battery sealing mold as claimed in claim 1, characterized in that: A guiding inclined surface (6) is provided in the circumferential direction of the bottom of the molding groove (3).

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