Cover plate assembly and injection mold

Abstract

The utility model relates to the technical field of batteries, in particular to a cover plate assembly and an injection mold. The cover plate assembly comprises a cover plate and a sealing ring. Wherein a through hole is formed in the cover plate, the sealing ring comprises a body and a protruding part integrally formed with the body, the body is embedded in the through hole, and the protruding part is located on the peripheral side of the body and abuts against the lower end face of the cover plate, so that the protruding part can play a certain role in limiting and supporting the body, that is, the protruding part is arranged at the injection molding pouring gate, and the sealing effect is improved. According to the cover plate assembly, the phenomenon that the body is sunken inwards in the demolding process of the cover plate assembly is avoided, the phenomenon that the sealing ring and the cover plate are separated from each other and even the sealing ring is pulled apart is avoided, the problems of whitening and layering of an injection molding pouring gate of the sealing ring due to inward sinking are solved, and the sealing performance between the sealing ring and the cover plate is improved. The steps of adjusting parameters such as the glue feeding mode and the exhaust rate in the prior art are not needed, operation is simpler, and the method can be suitable for cover plate assemblies of different structure types.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a cover plate assembly and an injection mold. Background Art

[0002] Generally, a lithium battery includes a cover plate and a sealing ring. A liquid injection hole is provided on the cover plate, and the sealing ring is injection molded around the side wall of the liquid injection hole by an integral injection molding method, so that the sealing ring can form a stable structure with the cover plate.

[0003] Currently, the sealing ring is usually made of perfluoroalkoxy (PFA) material. Due to the good mechanical properties of PFA, during the demolding process after the injection molding process of the sealing ring is completed, the sealing ring will be subjected to an upward pulling force, resulting in the phenomenon that the sealing ring is torn and separated from the cover plate, thus causing whitening, delamination and internal depression at the injection gate of the sealing ring. This not only affects the product yield of the cover plate assembly, but also reduces the sealing performance between the sealing ring and the cover plate.

[0004] In the prior art, the above problems are usually improved by adjusting the way of injecting glue, the exhaust rate, the injection temperature, the pressure and the injection speed. This not only has a large operation difficulty, but also is not applicable to products with some special structures, having certain limitations.

[0005] Therefore, it is urgent to design a cover plate assembly and an injection mold to solve the above technical problems. Summary of the Utility Model

[0006] The first object of the utility model is to provide a cover plate assembly to solve the problems of whitening and delamination at the injection gate of the sealing ring and improve the sealing performance between the sealing ring and the cover plate.

[0007] To achieve the above object, the utility model adopts the following technical solutions:

[0008] The utility model provides a cover plate assembly, including:

[0009] A cover plate, on which a through hole is provided;

[0010] A sealing ring, the sealing ring includes a body and a protruding part integrally formed with the body. The body is embedded in the through hole, the protruding part is located on the circumferential side of the body, and the protruding part abuts against the lower end surface of the cover plate.

[0011] As an alternative technical solution of the cover plate assembly, the protruding part is in the shape of a sector, a semicircle, a triangle or an irregular shape.

[0012] As an alternative technical solution of the cover plate assembly, a plurality of the protruding portions are provided, and the plurality of the protruding portions are uniformly arranged about the axis of the body.

[0013] As an alternative technical solution of the cover plate assembly, the body is circular, and the maximum distance between the protruding portion and the outer circumference of the body is set to be 0.1 mm to 0.5 mm.

[0014] As an alternative technical solution of the cover plate assembly, the body includes an integrally formed first clamping portion, a connecting portion, and a second clamping portion. The cover plate has a first end face and a second end face. The second end face is the lower end face. The connecting portion is located in the through hole. The first clamping portion is clamped and connected to the first end face, the second clamping portion is clamped and connected to the second end face, and the protruding portion is integrally formed with the second clamping portion.

[0015] As an alternative technical solution of the cover plate assembly, along the direction perpendicular to the first end face, the projections of the first clamping portion and the second clamping portion coincide with each other.

[0016] As an alternative technical solution of the cover plate assembly, the thickness of the body is set to be 0.2 mm to 0.5 mm, the thickness of the protruding portion is set to be 0.1 mm to 0.2 mm, and the thickness of the protruding portion is less than the thickness of the body.

[0017] As an alternative technical solution of the cover plate assembly, a sunk groove is provided on the first end face, the through hole is located on the sunk groove, the first clamping portion and the second clamping portion are respectively clamped on opposite sides of the sunk groove, and the first clamping portion is flush with the first end face.

[0018] The second object of the present invention is to provide an injection mold, and the product manufactured by the injection mold has good sealing performance, solves the problems of whitening and delamination caused by internal depression at the injection gate of the sealing ring, improves the product yield, and saves costs.

[0019] To achieve this purpose, the present invention adopts the following technical solutions:

[0020] The present invention provides an injection mold, and the injection mold is used to process the above-mentioned cover plate assembly; the injection mold includes a front mold insert pin, a rear mold insert pin, a rear mold insert, and an injection runner. The rear mold insert pin is disposed in the rear mold insert, and the rear mold insert is used to place the cover plate. The front mold insert pin passes through the through hole on the cover plate and is connected to the rear mold insert pin; the cover plate, the front mold insert pin, and the rear mold insert enclose an injection cavity, and the injection cavity is communicated with the injection runner.

[0021] As an alternative technical solution of an injection mold, the injection mold further includes a ejector pin. A chute is provided on the peripheral side wall of the rear mold insert, and the ejector pin is slidably connected to the chute so that the ejector pin can eject the cover plate assembly.

[0022] The beneficial effects of the present utility model at least include:

[0023] The present utility model provides a cover plate assembly, which includes a cover plate and a sealing ring. Among them, a through hole is provided on the cover plate. The sealing ring includes a body and a protruding portion integrally formed with the body. The body is embedded in the through hole, the protruding portion is located on the peripheral side of the body, and the protruding portion abuts against the lower end surface of the cover plate. In this way, the protruding portion can play a certain limiting and supporting role on the body. That is to say, a protruding portion is provided at the injection gate. The protruding portion can limit and support the body, thereby avoiding the phenomenon of internal depression of the body during the demolding process of the cover plate assembly, and further avoiding the phenomenon of mutual separation between the sealing ring and the cover plate, and even breaking the sealing ring. It solves the problems of whitening and delamination caused by internal depression at the injection gate of the sealing ring, and improves the sealing performance between the sealing ring and the cover plate. Therefore, there is no need for the steps of adjusting parameters such as the way of injecting glue, the exhaust rate, and the injection temperature in the prior art. The operation is simpler, it can be applied to cover plate assemblies of different structural types, and the universality is improved. Description of the Drawings

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for description in the embodiments of the present utility model. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present utility model and these drawings.

[0025] Figure 1 is a schematic structural diagram of the cover plate assembly provided by the embodiment of the present utility model Figure 1 ;

[0026] Figure 2 is a schematic structural diagram of the cover plate assembly provided by the embodiment of the present utility model Figure 2 ;

[0027] Figure 3 is a cross-sectional view of the cover plate assembly provided by the embodiment of the present utility model;

[0028] Figure 4 is an exploded view of the cover plate assembly provided by the embodiment of the present utility model;

[0029] Figure 5 is an exploded view of the injection mold provided by the embodiment of the present utility model.

[0030] Reference numerals:

[0031] 100, cover plate; 110, through hole; 120, first end face; 130, second end face; 140, counterbore;

[0032] 200, sealing ring; 210, body; 2101, first clamping portion; 2102, connecting portion; 2103, second clamping portion; 220, protruding portion;

[0033] 300, front mold insert pin; 400, rear mold insert pin; 500, rear mold insert; 510, chute; 600, injection runner; 610, injection cavity; 700, ejector pin. Detailed implementation manners

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0035] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0036] It should be noted that: similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0037] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship when the product of this utility model is normally placed. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present utility model. In addition, the terms "first", "second", "third", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise stated, the meaning of "a plurality" is two or more.

[0038] In the description of the present utility model, it should also be noted that, unless otherwise clearly specified and defined, the terms "arranged" and "connected" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0039] In the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may also include the first and second features not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over" and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0040] The embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0041] This embodiment provides a cover plate assembly, which solves the problems of whitening and delamination at the injection gate of the sealing ring and improves the sealing performance between the sealing ring and the cover plate.

[0042] Such as Figures 1-4As shown, the cover plate assembly mainly includes a cover plate 100 and a sealing ring 200. Among them, a through hole 110 is provided on the cover plate 100. The sealing ring 200 includes a main body 210 and a protruding portion 220 integrally formed with the main body 210. The main body 210 is embedded in the through hole 110, and the protruding portion 220 is located on the circumferential side of the main body 210, and the protruding portion 220 abuts against the lower end surface of the cover plate 100. In this way, the protruding portion 220 can play a certain limiting and supporting role on the main body 210. That is to say, by setting the protruding portion 220 at the injection molding gate, the protruding portion 220 can limit and support the main body 210, thereby avoiding the phenomenon of internal depression of the main body 210 during the demolding process of the cover plate assembly, and further avoiding the phenomenon of mutual separation between the sealing ring 200 and the cover plate 100, and even breaking the sealing ring 200. This solves the problems of whitening and delamination caused by internal depression at the injection molding gate of the sealing ring 200, and improves the sealing performance between the sealing ring 200 and the cover plate 100. Thus, there is no need for the steps of adjusting parameters such as the way of feeding glue, the exhaust rate, and the injection temperature in the prior art, the operation is simpler, it can be applied to cover plate assemblies of different structural types, and the universality is improved.

[0043] It should be noted that the internal depression referred to in this embodiment is a phenomenon in which the sealing ring 200 is deformed by an upward pulling force during the demolding process after the cover plate assembly is processed.

[0044] Optionally, the cover plate 100 in this embodiment can be processed and made of a metal material, and the sealing ring 200 is processed and made of a polytetrafluoroethylene material.

[0045] Optionally, the protruding portion 220 in this embodiment can be set as one of a fan shape, a semi-circular shape, a triangular shape or an irregular shape, so as to improve the flexibility of processing and manufacturing the protruding portion 220 and improve work efficiency. Of course, the operator can also set the protruding portion 220 to other shapes according to actual needs, which will not be elaborated here one by one.

[0046] Optionally, multiple protruding portions 220 are provided in this embodiment, and the multiple protruding portions 220 are evenly arranged about the axis of the main body 210. In this way, the stability and reliability of the force received by the sealing ring 200 can be improved, and stress concentration can be avoided. Exemplarily, the protruding portions 220 are evenly distributed in numbers such as three, four, five, etc.

[0047] Optionally, in this embodiment, the main body 210 is circular, and the maximum distance between the protruding portion 220 and the outer circumference of the main body 210 is set to 0.1 mm to 0.5 mm. In this way, it can not only ensure the limiting and supporting effect of the protruding portion 220 on the main body 210, avoid the phenomenon of fracture and separation between the injection molding gate of the sealing ring 200 and the cover plate 100, but also save the volume of the sealing ring 200, save costs, and improve work efficiency.

[0048] As Figure 3 shown, in this embodiment, the body 210 includes an integrally formed first clamping portion 2101, a connecting portion 2102, and a second clamping portion 2103. The cover plate 100 has a first end face 120 and a second end face 130. The second end face 130 is the lower end face of the cover plate 100. The connecting portion 2102 is located in the through hole 110. The first clamping portion 2101 is clamped and connected to the first end face 120, the second clamping portion 2103 is clamped and connected to the second end face 130, and the protruding portion 220 is integrally formed with the second clamping portion 2103. By providing the first clamping portion 2101 and the second clamping portion 2103, the stability and reliability of the embedding of the sealing ring 200 and the cover plate 100 can be improved, and the phenomenon of the sealing ring 200 falling off during the later use process (for example, during the process of installing the pole column in the through hole 110) can be avoided.

[0049] Preferably, in this embodiment, along the direction perpendicular to the first end face 120, the projections of the first clamping portion 2101 and the second clamping portion 2103 coincide with each other. This can improve the uniformity of the force on the sealing ring 200, avoid stress concentration, and at the same time improve the stability and reliability of the embedding of the sealing ring 200 and the through hole 110 on the cover plate 100.

[0050] Optionally, in this embodiment, the thickness of the body 210 is set to 0.2 mm to 0.5 mm, and the thickness of the protruding portion 220 is set to 0.1 mm to 0.2 mm, and the thickness of the protruding portion 220 is less than the thickness of the body 210. This can facilitate the assembly of the sealing ring 200 and the through hole 110 on the cover plate 100, and improve the stability and reliability. Exemplarily, the thickness of the body 210 can be set to values such as 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, etc.; the thickness of the protruding portion 220 can be set to values such as 0.1 mm, 0.2 mm, etc.

[0051] Preferably, the thickness of the protruding portion 220 in this embodiment is the same as the thickness of the second clamping portion 2103, which can improve the processing efficiency and save costs.

[0052] As Figures 3-4 shown, in this embodiment, the first end face 120 is provided with a counterbore 140. The through hole 110 is located on the counterbore 140. The first clamping portion 2101 and the second clamping portion 2103 are respectively clamped on opposite sides of the counterbore 140, and the first clamping portion 2101 is flush with the first end face 120. This can play a certain protective role for the sealing ring 200, reduce or avoid the risk of the first clamping portion 2101 of the sealing ring 200 being damaged or contaminated by foreign objects from the outside, improve the safety performance, and save costs.

[0053] As Figure 5As shown in the figure, this embodiment also provides an injection mold for processing the above-mentioned cover plate assembly. The injection mold includes a front mold insert pin 300, a rear mold insert pin 400, a rear mold insert 500, and an injection runner 600. The rear mold insert pin 400 is inserted into the rear mold insert 500. The rear mold insert 500 is used to place the cover plate 100. The front mold insert pin 300 passes through the through hole 110 on the cover plate 100 and is connected to the rear mold insert pin 400. The cover plate 100, the front mold insert pin 300, and the rear mold insert 500 enclose an injection cavity 610, and the injection cavity 610 is communicated with the injection runner 600. It should be noted that there is a certain gap between the rear mold insert pin 400 and the through hole 110 on the cover plate 100. Thus, during the injection process, it is convenient for the hot melt adhesive to flow from this gap to the upper surface of the sunk platform 140 to form the first clamping portion 2101. The hot melt adhesive forms a connecting portion 2102 at the gap and forms a second clamping portion 2103 in the injection cavity 610. At the same time, the protruding portion 220 is integrally formed with the second clamping portion 2103 through the injection runner 600.

[0054] Optionally, the front mold insert pin 300 and the rear mold insert pin 400 are connected by a sleeved manner, which can avoid the appearance of gaps at the connection between the front mold insert pin 300 and the rear mold insert pin 400 and affect the molding structure of the sealing ring 200.

[0055] Please continue to refer to Figure 5 , the injection mold in this embodiment further includes an ejector pin 700. A sliding groove 510 is provided on the peripheral side wall of the rear mold insert 500. The ejector pin 700 is slidably connected to the sliding groove 510 so that the ejector pin 700 can eject the cover plate assembly, which is convenient for the operator to take out the cover plate assembly, improve the operation efficiency, and save costs.

[0056] Optionally, multiple ejector pins 700 can be provided in this embodiment. For example, three ejector pins 700 are provided, and the three ejector pins 700 are evenly arranged about the axis of the rear mold insert 500. In this way, when the ejector pin 700 ejects the cover plate assembly, the force uniformity of the cover plate assembly can be improved, and the phenomenon of the cover plate assembly tipping over can be avoided.

[0057] The product manufactured by the injection mold in this embodiment has good sealing performance, solves the problems of whitening and delamination caused by internal depression at the injection gate of the sealing ring 200, improves the product yield, and saves costs.

[0058] Obviously, the above are only the preferred embodiments of the present utility model and the technical principles applied. Those skilled in the art will understand that the present utility model is not limited to the specific embodiments here, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present utility model. Therefore, although the present utility model has been described in detail through the above embodiments, the present utility model is not limited to the above embodiments. Without departing from the concept of the present utility model, more other equivalent embodiments can be included, and the scope of the present utility model is determined by the scope of the appended claims.

[0059] Note that in the description of this specification, the descriptions referring to the terms "some embodiments", "other embodiments", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

Claims

1. A cover plate assembly, characterized in that: include: A cover plate (100), wherein the cover plate (100) is provided with a through hole (110); A sealing ring (200), the sealing ring (200) comprising a main body (210) and a protrusion (220) integrally formed with the main body (210), the main body (210) being embedded in the through hole (110), the protrusion (220) being located on the peripheral side of the main body (210), and the protrusion (220) being in contact with the lower end surface of the cover plate (100).

2. The cover plate assembly according to claim 1, characterized in that: The protrusion (220) is in a fan-shaped, semicircular, triangular or irregular shape.

3. The cover plate assembly according to claim 1, characterized in that: The protrusions (220) are provided in plurality, and the plurality of protrusions (220) are evenly arranged about the axis of the body (210).

4. The cover plate assembly according to claim 1, characterized in that: The body (210) is circular, and the maximum distance between the protrusion (220) and the outer circumference of the body (210) is set to 0.1 mm to 0.5 mm.

5. The cover plate assembly according to claim 1, characterized in that: The body (210) comprises a first clamping portion (2101), a connecting portion (2102) and a second clamping portion (2103) which are integrally formed; the cover plate (100) has a first end surface (120) and a second end surface (130); the second end surface (130) is the lower end surface; the connecting portion (2102) is located in the through hole (110); the first clamping portion (2101) is clamped and connected to the first end surface (120); the second clamping portion (2103) is clamped and connected to the second end surface (130); and the protrusion (220) and the second clamping portion (2103) are integrally formed.

6. The cover plate assembly according to claim 5, characterized in that: Along a direction perpendicular to the first end surface (120), a projection of the first clamping portion (2101) and a projection of the second clamping portion (2103) overlap with each other.

7. The cover plate assembly according to claim 5, characterized in that: The thickness of the main body (210) is set to 0.2 mm to 0.5 mm, the thickness of the protruding portion (220) is set to 0.1 mm to 0.2 mm, and the thickness of the protruding portion (220) is smaller than the thickness of the main body (210).

8. The cover plate assembly according to claim 5, characterized in that: The first end surface (120) is provided with a sink (140), the through hole (110) is located on the sink (140), the first clamping portion (2101) and the second clamping portion (2103) are respectively clamped on opposite sides of the sink (140), and the first clamping portion (2101) is flush with the first end surface (120).

9. An injection mold, characterized in that: The injection mold is used to process the cover plate assembly described in any one of claims 1 to 8; the injection mold comprises a front mold insert (300), a rear mold insert (400), a rear mold insert (500) and an injection channel (600), the rear mold insert (400) is inserted into the rear mold insert (500), the rear mold insert (500) is used to place the cover plate (100), the front mold insert (300) passes through the through hole (110) on the cover plate (100) and is connected to the rear mold insert (400); the cover plate (100), the front mold insert (300) and the rear mold insert (500) are surrounded by an injection chamber (610), and the injection chamber (610) is connected to the injection channel (600).

10. The injection mold according to claim 9, characterized in that: The injection mold further comprises an ejector pin (700), a slide groove (510) is arranged on the peripheral side wall of the rear mold insert (500), and the ejector pin (700) is slidably connected to the slide groove (510) so that the ejector pin (700) can eject the cover plate assembly.

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