Sealing ring for cylindrical battery cover plate

Abstract

The utility model discloses a sealing ring for a cylindrical battery cover plate. The sealing ring comprises an annular body and an annular side wall axially extending from the periphery of the annular body. The space defined by the annular side wall is communicated with the space defined by the annular body, and the radial size of the space defined by the annular side wall is larger than that of the space defined by the annular body. The first end, away from the annular body, of the annular side wall is provided with a plurality of separation grooves formed in the circumferential direction of the annular side wall at intervals. The sealing ring for the cylindrical battery cover plate disclosed by the utility model can effectively prevent the exposed part of the cylindrical battery cover plate from generating undesirable effects such as warping and edge bulging after sealing, so that the appearance yield and the long-storage sealing property of the battery are improved.

Description

Technical Field

[0001] The utility model relates to a sealing ring, in particular to a sealing ring for a cylindrical battery cover plate. Background Art

[0002] With the vigorous development of the new energy industry, a huge market is provided for the battery industry, thereby accelerating the pace of development of the battery industry.

[0003] At present, lithium-ion cylindrical batteries have gradually become the mainstream products in the new energy industry due to their advantages such as high energy density, high charge and discharge rate, and good capacity consistency. Among them, in the manufacturing process of lithium-ion cylindrical batteries, the cylindrical battery sealing process is indispensable. The cylindrical battery sealing types can be divided into mechanical sealing and laser sealing. Since the cover of the mechanical seal needs to be equipped with a sealing ring, it can play the role of insulating the positive and negative electrodes and sealing the battery after sealing.

[0004] However, in the cylindrical manufacturing process, due to factors such as the parallelism of the grooving and sealing equipment, force deviation, and the degree of matching with the cylindrical battery, the leaking part of the sealing ring after sealing is prone to warping, bulging, and other adverse effects, which poses a certain risk to the battery appearance, yield, and long-term storage sealing.

[0005] Therefore, there is an urgent need for a sealing ring for a cylindrical battery cover to overcome one or more of the above-mentioned defects. Utility Model Content

[0006] The utility model aims to provide a sealing ring for a cylindrical battery cover, which can effectively prevent the leakage portion after sealing from warping and bulging, thereby improving the appearance yield and long-term storage sealing of the battery.

[0007] To achieve the above-mentioned purpose, the sealing ring for cylindrical battery cover of the utility model comprises an annular body and an annular side wall extending axially from the periphery of the annular body. The space enclosed by the annular side wall is connected to the space enclosed by the annular body, and the radial dimension of the space enclosed by the annular side wall is larger than the radial dimension of the space enclosed by the annular body. A plurality of separation grooves are arranged spaced apart along the circumference of the annular side wall on the first end away from the annular body.

[0008] Compared with the prior art, a plurality of separation grooves are provided on the first end of the annular side wall away from the annular body and are spaced apart along the circumference of the annular side wall. Such a design can effectively prevent the undesirable effects such as warping and bulging of the leaking part of the cylindrical battery cover plate sealing ring of the utility model after the sealing is completed. This is because the cylindrical battery cover plate sealing ring of the utility model uses the separation groove to release the stress concentration during the sealing process, so that the first end of the annular side wall is easily folded back to form a leaking part, thereby improving the appearance yield and long storage sealing of the battery. In addition, the cylindrical battery cover plate sealing ring of the utility model does not require large-scale precision and stability improvements on the sealing equipment, nor does it require optimization of the sealing process parameters, so it will not increase production costs and reduce production efficiency, and has higher economic benefits than the prior art. In addition, the cylindrical battery cover plate sealing ring of the utility model is more practical and reliable than the existing sealing rings.

[0009] Preferably, the separation groove is arranged to extend obliquely along the axial direction of the annular body, and the inclination angle of the separation groove is 10 to 15 degrees.

[0010] Preferably, the groove depth of the separation groove is 0.3 to 0.5 mm, and the groove width of the separation groove is 0.5 to 1 mm.

[0011] Preferably, the annular body and the annular side wall are coaxially arranged.

[0012] Preferably, the sealing ring for the cylindrical battery cover is a fluororubber ring.

[0013] Preferably, the annular body includes a first ring body, an intermediate ring body and a second ring body in sequence along the axial direction away from the annular side wall. The first ring body, the intermediate ring body and the second ring body are connected together in sequence. The outer diameter of the first ring body is greater than the outer diameter of the second ring body, so that the second ring body and the intermediate ring body together form a necking structure.

[0014] Preferably, the first ring body and the second ring body are arranged to extend radially and linearly, the inner side surface of the intermediate ring body is an inclined surface inclined relative to the axis of the intermediate ring body, and the cross section of the outer side surface of the intermediate ring body is an arc.

[0015] Preferably, the inner side surface of the intermediate ring body is connected to the first end surfaces of the first ring body and the second ring body respectively, and the outer side surface of the intermediate ring body is connected to the second end surface of the first ring body and the outer side surface of the second ring body respectively.

[0016] Preferably, all the separation grooves are arranged in a circle at equal intervals on the first end portion of the annular side wall.

[0017] Preferably, the separation groove is prism-shaped. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of a sealing ring for a cylindrical battery cover plate of the utility model.

[0019] Figure 2 yes Figure 1 The cylindrical battery cover shown is a plan view of the sealing ring viewed from the direction opposite to that indicated by arrow A.

[0020] Figure 3 is along Figure 2 Internal view of the section along the midline BB.

[0021] Figure 4 yes Figure 2 A plan view of a cylindrical battery cover plate after being sealed with a sealing ring is shown.

[0022] Figure 5 is along Figure 4 Internal view of the section taken along the mid-CC line.

[0023] Figure 6 is Figure 2 Figure 2 shows the state of the cover and battery housing.

[0024] Figure 7 yes Figure 5 Figure 2 shows the state of the cover and battery housing. DETAILED DESCRIPTION

[0025] Embodiments of the present invention will now be described with reference to the accompanying drawings, in which like reference numerals represent like elements.

[0026] See also Figure 5 and Figure 6 The sealing ring 100 for the cylindrical battery cover of the utility model is arranged between the battery cover 200 and the battery casing 300, so as to seal and insulate the battery cover 200 and the battery casing 300 after the sealing ring 100 for the cylindrical battery cover of the utility model is sealed; optionally, as an example, the sealing ring 100 for the cylindrical battery cover of the utility model is a fluororubber ring, so that the sealing ring 100 for the cylindrical battery cover of the utility model has good heat resistance, cold resistance, weather resistance and electrical insulation; obviously, according to actual needs, the sealing ring 100 for the cylindrical battery cover of the utility model can also be made of PP, PBT or PFA and other materials well known in the art.

[0027] Recombination Figure 1 The sealing ring 100 for a cylindrical battery cover of the utility model comprises an annular body 10 and an annular side wall 20 extending axially from the periphery 11 of the annular body 10. Optionally, Figure 3 and Figure 4As an example, the annular body 10 and the annular side wall 20 are coaxially arranged so that the center lines of the two coincide with each other. Figure 3 and Figure 5 In addition, the space 21 surrounded by the annular side wall 20 is connected to the space 11 surrounded by the annular body 10, and the radial dimension of the space 21 surrounded by the annular side wall 20 is larger than the radial dimension of the space 11 surrounded by the annular body 10. Figure 3 and Figure 4 In addition, four separation grooves 23 are arranged at intervals along the circumference of the annular side wall 20 on the first end 22 away from the annular body 10. Optionally, Figure 1 , Figure 2 and Figure 4 As an example, all the separation grooves 23 are arranged in a circle at equal intervals on the first end 22 of the annular side wall 20 to ensure the uniformity of the arrangement of the separation grooves 23 on the first end 22, so as to facilitate the folding operation of the first end 22 of the annular side wall 20 during the sealing process of the cylindrical battery cover sealing ring 100 of the utility model, and form a Figure 4 , Figure 5 or Figure 7 The leaking portion 24 shown in the figure can further prevent the leaking portion 24 of the cylindrical battery cover plate sealing ring 100 of the utility model from warping and bulging after being sealed; obviously, according to actual needs, the number of the separation grooves 23 can also be two, three or five, so it is not limited to Figure 1 , Figure 2 and Figure 4 More specifically, as follows:

[0028] like Figures 1 to 3As shown, as an example, the separation groove 23 is arranged along the axial direction of the annular body 10 and is inclined and extended. The separation groove 23 may be prismatic, so as to further improve the ease and smoothness of the first end 22 of the annular side wall 20 being folded back during the sealing process of the cylindrical battery cover sealing ring 100 of the utility model to form the external leakage portion 24. In addition, the inclination angle α of the separation groove 23 is 10 to 15 degrees, for example, the inclination angle α is 10 degrees, 11 degrees, 12 degrees, 13 degrees, 14 degrees or 15 degrees. In addition, the groove depth P of the separation groove 23 is 0.3 to 0.5 mm, for example, the groove depth P is 0.3 mm, 0.4 mm or 0.5 mm; the groove width D of the separation groove 23 is 0.5 to 1 mm, for example, the groove width D is 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm. Combined with the cylindrical battery cover of the utility model, the external leakage portion 24 is generally 1.5 to 2.5 mm after being sealed with the sealing ring 100. Therefore, this design effectively reduces the warping and bulging of the external leakage portion 24 after sealing.

[0029] like Figure 3 and Figure 5 As shown, as an example, the annular body 10 includes a first ring body 10a, an intermediate ring body 10b and a second ring body 10c in the axial direction away from the annular side wall 20 (i.e., the opposite direction indicated by arrow A). The first ring body 10a, the intermediate ring body 10b and the second ring body 10c are sequentially connected together, and the outer diameter of the first ring body 10a is greater than the outer diameter of the second ring body 10c, so that the second ring body 10c and the intermediate ring body 10b together form a necking structure. Specifically, Figure 3 and Figure 5 As an example, the first ring body 10a and the second ring body 10c are arranged to extend radially and linearly, and the inner side surface 10b1 of the middle ring body 10b is relative to the axis of the middle ring body 10b (see Figure 3 and Figure 5 The cross section of the outer side surface 10b2 of the intermediate ring body 10b is an arc, so that the first ring body 10a and the second ring body 10c are smoothly transitioned by the intermediate ring body 10b. More specifically, Figure 3 and Figure 5 As an example, the inner side surface 10b1 of the intermediate ring body 10b is connected to the first end surfaces 10a1 (10c1) of the first ring body 10a and the second ring body 10c, respectively, and the outer side surface 10b2 of the intermediate ring body 10b is connected to the second end surface 10a2 of the first ring body 10a and the outer side surface 10c2 of the second ring body 10c, respectively. Figure 3 and Figure 5 so that the first ring body 10a and the second ring body 10c have a smoother transition with the aid of the intermediate ring body 10c.

[0030] Compared with the prior art, a plurality of separation grooves 23 are arranged along the circumference of the annular side wall 20 by means of the first end 22 of the annular side wall 20 away from the annular body 10. Such a design can effectively prevent the leakage part 24 of the cylindrical battery cover plate sealing ring 100 of the utility model from warping and bulging after being sealed. This is because the cylindrical battery cover plate sealing ring 100 of the utility model uses the separation groove 23 to release stress concentration during the sealing process, so that the first end 22 of the annular side wall 20 is easily folded back to form the leakage part 24, thereby improving the appearance yield and long storage sealing of the battery. In addition, the cylindrical battery cover plate sealing ring 100 of the utility model does not need to make large-scale precision and stability improvements on the sealing equipment, nor does it need to optimize the sealing process parameters, so it will not increase production costs and reduce production efficiency, and has higher economic benefits than the prior art. In addition, the cylindrical battery cover plate sealing ring 100 of the utility model is more practical and reliable than the existing sealing ring.

[0031] It is worth noting that the direction indicated by arrow A in the drawings and the opposite direction are the axial direction of the annular body 10. In addition, the separation groove 23 can be made by injection molding, die cutting or hot melting.

[0032] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention are still within the scope covered by the present invention.

Claims

1. A sealing ring for a cylindrical battery cover, comprising an annular body and an annular side wall extending axially from the periphery of the annular body, wherein the space enclosed by the annular side wall is connected to the space enclosed by the annular body, and the radial dimension of the space enclosed by the annular side wall is greater than the radial dimension of the space enclosed by the annular body, characterized in that: A plurality of separation grooves spaced apart from each other along the circumference of the annular side wall are formed on a first end portion of the annular side wall away from the annular body.

2. The sealing ring for cylindrical battery cover according to claim 1, characterized in that: The separation groove is arranged to extend obliquely along the axial direction of the annular body, and the inclination angle of the separation groove is 10 to 15 degrees.

3. The sealing ring for cylindrical battery cover according to claim 1, characterized in that: The groove depth of the separation groove is 0.3 to 0.5 mm, and the groove width of the separation groove is 0.5 to 1 mm.

4. The sealing ring for cylindrical battery cover according to claim 1, characterized in that: The annular body is coaxially arranged with the annular side wall.

5. The sealing ring for cylindrical battery cover according to claim 1, characterized in that: The sealing ring for the cylindrical battery cover is a fluororubber ring.

6. The sealing ring for cylindrical battery cover according to claim 1, characterized in that: The annular body includes a first ring body, an intermediate ring body and a second ring body in sequence along the axial direction away from the annular side wall. The first ring body, the intermediate ring body and the second ring body are connected together in sequence. The outer diameter of the first ring body is greater than the outer diameter of the second ring body, so that the second ring body and the intermediate ring body together form a necking structure.

7. The sealing ring for cylindrical battery cover according to claim 6, characterized in that: The first ring body and the second ring body are both arranged to extend radially and linearly, the inner side surface of the intermediate ring body is an inclined surface inclined relative to the axis of the intermediate ring body, and the cross section of the outer side surface of the intermediate ring body is an arc.

8. The sealing ring for cylindrical battery cover according to claim 6, characterized in that: The inner side surface of the intermediate ring body is connected to the first end surfaces of the first ring body and the second ring body respectively, and the outer side surface of the intermediate ring body is connected to the second end surface of the first ring body and the outer side surface of the second ring body respectively.

9. The sealing ring for cylindrical battery cover according to claim 1, characterized in that: All the dividing grooves are arranged in a circle at equal intervals on the first end of the annular side wall.

10. The sealing ring for cylindrical battery cover according to claim 1, characterized in that: The separation groove is prism-shaped.

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