Cover plate injection mold and cover plate mold assembly

Abstract

The utility model belongs to the technical field of batteries, and discloses a cover plate injection mold and a cover plate mold assembly, the cover plate injection mold is used for forming lower plastic on the surface of one side of a cover plate body, the cover plate injection mold comprises a mold body and a first sealing plate, the mold body comprises a plurality of side walls, and the side walls are sequentially connected end to end and define a containing groove; the multiple side walls comprise the first side wall and the second side wall which are oppositely arranged, a first glue injection opening is formed in the first side wall, the cover plate body can be placed in the containing groove, liquid plastic can be injected into the containing groove through the first glue injection opening, and lower plastic is formed on the side, away from the bottom of the containing groove, of the cover plate body. The first sealing plate is detachably connected with the first side wall and covers the first glue injection opening, and the surface, facing one side of the second side wall, of the first sealing plate protrudes in the direction facing the second side wall, so that a concave area is formed in the uncured lower plastic, and outward protruding deformation of the lower plastic in the cooling and curing process is compensated.

Description

Technical Field

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

[0002] The battery cover plate sealing cover is arranged on the battery shell and forms a sealed space with the battery shell. The battery cell is arranged in the sealed space, thereby forming a battery cell.

[0003] The side of the battery cover facing the battery shell is covered with a plastic part to achieve insulation between the battery cover and the battery shell. The plastic part is formed by an injection molding process. Specifically, the battery cover is installed in an injection mold, and then liquid plastic is poured into the mold through the injection port of the injection mold. After the liquid plastic cools and solidifies, a plastic part is formed.

[0004] Usually, the position where the plastic part and the injection port are opposite is called the glue port. The glue port is generally located on one side wall of the plastic part. During the process of liquid plastic cooling and solidifying into a plastic part, the plastic part in the glue port area will bulge outward under the action of stress, and may even bulge out of the side wall of the battery cover. This will reduce the accuracy of the sealing inspection of the battery cover covered with the plastic part, and also increase the difficulty of installing the battery cover covered with the plastic part into the battery shell.

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

[0006] A first object of the present utility model is to provide a cover plate injection mold, wherein the surface of the first closing plate facing the second side wall is made to protrude in the direction toward the second side wall, so that a recessed area is formed at a position corresponding to the first injection port when the lower plastic is not solidified, thereby compensating for the outward protrusion deformation of the lower plastic at the position corresponding to the first injection port during the cooling and solidification process.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] The cover plate injection mold is used to form the lower plastic on one side surface of the cover plate body. The cover plate injection mold includes:

[0009] The mold body includes a plurality of side walls, which are sequentially connected end to end to enclose a receiving groove, the plurality of side walls including a first side wall and a second side wall arranged opposite each other, the first side wall being provided with a first injection port, the cover body being capable of being placed in the receiving groove, and liquid plastic being capable of being injected into the receiving groove through the first injection port to form a lower plastic on a side of the cover body facing away from the bottom of the receiving groove;

[0010] The first sealing plate is detachably connected to the first side wall and covers the first glue injection port. The surface of the first sealing plate facing the second side wall protrudes in the direction toward the second side wall.

[0011] Optionally, the surface of the first sealing plate facing the second side wall includes a first plane and two first slopes, the first plane is located between the two first slopes, and both sides of the first plane are respectively connected to a corresponding first slope, and the first slope is inclined from the side connected to the first plane to the side away from the first plane along the direction away from the second side wall.

[0012] Optionally, the second side wall includes a deformation zone, the deformation zone is arranged opposite to the first sealing plate, and a surface of the deformation zone facing the first sealing plate protrudes in a direction away from the first sealing plate.

[0013] Optionally, the surface of the deformation zone facing the first sealing plate includes a second plane and two second slopes, the second plane is located between the two second slopes, and both sides of the second plane are respectively connected to a corresponding second slope, and the second slope is inclined from the side connected to the second plane to the side away from the second plane along the direction close to the first sealing plate.

[0014] A second object of the present invention is to provide a cover plate mold assembly that can reduce the probability of the lower plastic bulging outward and deforming during the cooling and solidification process.

[0015] To achieve this purpose, the present invention adopts the following technical solutions:

[0016] A cover mold assembly includes a battery cover and the above-mentioned cover injection mold. The battery cover includes a cover body and a lower plastic. The cover body is located in the accommodating groove and is detachably connected to the cover injection mold. The lower plastic covers the surface of the cover body on one side facing away from the bottom of the accommodating groove. The outer wall of one side of the lower plastic is respectively fitted with the surface of the first side wall facing the accommodating groove and the surface of the first sealing plate facing the accommodating groove, and the outer wall of the other side of the lower plastic is fitted with the surface of the second side wall facing the accommodating groove.

[0017] Optionally, the battery cover further includes a pole, which passes through the cover body and the lower plastic and is fixedly connected to the cover body.

[0018] Optionally, the pole includes a base and a column, the base is located on the side of the lower plastic away from the cover body and is connected to the column, the column passes through the lower plastic and the cover body and is fixedly connected to the cover body, and the lower plastic is clamped between the base and the cover body.

[0019] Optionally, a second injection port is provided on the first side wall, and liquid plastic can also be injected into the receiving groove through the second injection port, and form lower plastic on the side of the cover body away from the bottom of the receiving groove. The second injection port is arranged close to the pole, and the cover injection mold also includes a second sealing plate, which is detachably connected to the first side wall and covers the second injection port.

[0020] Optionally, the number of the second glue injection ports, the second sealing plate and the poles are two and they correspond one to one, the two second glue injection ports are respectively located on both sides of the first glue injection port, and the two second glue injection ports are spaced apart from the first glue injection port.

[0021] Beneficial effects of the utility model:

[0022] The cover plate injection mold provided by the utility model, when injecting liquid plastic into the accommodating groove, the first sealing plate is removed, and liquid plastic is injected into the accommodating groove through the first injection port. After the injection is completed, the first sealing plate cover is set at the first injection port, and the surface of the first sealing plate facing the second side wall is protruded in the direction toward the second side wall, so that the uncured lower plastic forms a recessed area at the position corresponding to the first injection port. After the lower plastic is slightly cured, the cover plate injection mold is removed, and the lower plastic is allowed to cool and solidify naturally. During the natural cooling and solidification process of the lower plastic, the recessed area of ​​the lower plastic convexly deforms outwards. It can be seen that the design of the first sealing plate forms a recessed area on the uncured lower plastic, which compensates for the outward convex deformation of the lower plastic during the cooling and solidification process, reduces the probability of the lower plastic convexing outwards due to stress during cooling and solidification, is beneficial to improving the accuracy of the sealing detection of the battery cover, and also reduces the difficulty of installing the battery cover into the battery shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic cross-sectional view of the cover plate injection mold provided by the present invention;

[0024] Figure 2 This is a schematic diagram of the cross-sectional structure of the mold body provided by the utility model;

[0025] Figure 3 This is a schematic diagram of the structure of the lower plastic provided by the present invention when it is not completely cooled and solidified;

[0026] Figure 4 yes Figure 3 A partial enlarged view of point B in the middle;

[0027] Figure 5 This is a structural diagram of the first sealing plate provided by the utility model;

[0028] Figure 6 yes Figure 2 A partial enlarged view of the middle A;

[0029] Figure 7 It is a schematic diagram of the partial cross-sectional structure of the battery cover provided by the utility model.

[0030] In the picture:

[0031] 10. Cover body; 20. Lower plastic; 21. First wall; 22. Second wall; 23. Recessed area; 24. Protruding area; 25. First recessed plane; 26. First recessed inclined surface; 27. First protruding plane; 28. First protruding inclined surface; 30. Pole; 31. Base; 32. Column;

[0032] 100. Mold body; 110. Receiving groove; 121. First side wall; 122. Second side wall; 131. First glue injection port; 132. Second glue injection port; 140. Deformation zone; 141. Second plane; 142. Second slope; 200. First closing plate; 210. First plane; 220. First slope; 300. Second closing plate. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0034] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0035] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0037] This embodiment provides a cover plate injection mold for forming a lower plastic on one side surface of the cover plate body. By making the surface of the first sealing plate facing the second side wall protrude in the direction toward the second side wall, the lower plastic forms a recessed area at the position corresponding to the first injection port when it is not solidified, thereby compensating for the outward protrusion deformation of the lower plastic at the position corresponding to the first injection port during the cooling and solidification process.

[0038] Specifically, if Figures 1 to 4 As shown, the cover plate injection mold includes a mold body 100 and a first closing plate 200, wherein the mold body 100 includes a plurality of side walls, which are sequentially connected end to end and enclosed to form a receiving groove 110, and the plurality of side walls include a first side wall 121 and a second side wall 122 arranged opposite to each other, and a first injection port 131 is provided on the first side wall 121, and the cover plate body 10 can be placed in the receiving groove 110, and liquid plastic can be injected into the receiving groove 110 through the first injection port 131, and a lower plastic 20 is formed on the side of the cover plate body 10 away from the bottom of the receiving groove 110; the first closing plate 200 is detachably connected to the first side wall 121 and is covered at the first injection port 131, and the surface of the first closing plate 200 facing the second side wall 122 protrudes in the direction toward the second side wall 122. In this embodiment, the number of side walls is four, and in other embodiments, the number of side walls can also be five or six, etc., depending on production requirements.

[0039] Based on the above design, when injecting liquid plastic into the receiving tank 110, the first sealing plate 200 is removed, and liquid plastic is injected into the receiving tank 110 through the first injection port 131. After the injection is completed, the first sealing plate 200 is placed on the first injection port 131, and the surface of the first sealing plate 200 facing the second side wall 122 is protruded in the direction toward the second side wall 122, so that the uncured lower plastic 20 forms a concave area 23 at the position corresponding to the first injection port 131. After the lower plastic 20 is slightly cured, the cover plate injection mold is removed (at this time, the lower plastic 20 has not completely cooled and solidified, so A recessed area 23 is still left on the first wall 21 of the lower plastic 20, so that the lower plastic 20 is naturally cooled and solidified. During the natural cooling and solidification process of the lower plastic 20, the recessed area 23 of the lower plastic 20 bulges outward. It can be seen that the design of the first sealing plate 200 forms a recessed area 23 on the unsolidified lower plastic 20. The recessed area 23 compensates for the outward bulging deformation of the lower plastic 20 during the cooling and solidification process, reduces the probability of the lower plastic 20 bulging outward due to stress during cooling and solidification, is beneficial to improving the accuracy of the battery cover sealing detection, and also reduces the difficulty of installing the battery cover into the battery shell.

[0040] Furthermore, if Figures 1 to 5 As shown, the surface of the first sealing plate 200 facing the second side wall 122 includes a first plane 210 and two first slopes 220, the first plane 210 is located between the two first slopes 220, and the two sides of the first plane 210 are respectively connected to a corresponding first slope 220, and the first slope 220 is inclined from the side connected to the first plane 210 to the side away from the first plane 210 in a direction away from the second side wall 122, thereby making the first plane 210 of the first sealing plate 200 correspond to the first concave plane 25 of the concave area 23, and the two first slopes 220 of the first sealing plate 200 are respectively connected to the first slopes 220. The first concave inclined surfaces 26 of the lower plastic 20 correspond to the two first concave inclined surfaces 26 of the concave area 23, that is, the concave area 23 of the lower plastic 20 includes a first concave plane 25 and two first concave inclined surfaces 26. The first concave plane 25 is located between the two first concave inclined surfaces 26, and the two sides of the first concave plane 25 are respectively connected to a corresponding first concave inclined surface 26. When the lower plastic 20 cools and solidifies, the concave area 23 bulges outward and deforms relatively evenly, reducing the probability of a certain position of the concave area 23 bulging outward when the lower plastic 20 cools and solidifies, thereby providing further protection for the overall structural consistency of the lower plastic 20.

[0041] Alternatively, as Figures 1 to 5As shown, the second side wall 122 includes a deformation area 140, which is arranged opposite to the first sealing plate 200. The surface of the deformation area 140 facing the first sealing plate 200 protrudes in a direction away from the first sealing plate 200. Therefore, when the lower plastic 20 is not completely cooled and solidified, a protruding area 24 is formed on the second wall 22 at a position corresponding to the deformation area 140. After the cover plate injection mold is removed, during the natural cooling and solidification process of the lower plastic 20, the concave area 23 of the lower plastic 20 protrudes outward and deforms. The protruding area 24 of the second wall 22 is deformed inwardly, that is, the lower plastic 20 located between the recessed area 23 and the protruding area 24 is offset as a whole in the direction from the second wall 22 to the first wall 21. It can be seen that the design of the deformation area 140 reduces the probability of the second wall 22 of the lower plastic 20 being concave inward (that is, concave in the direction away from the first wall 21) after cooling and solidification at the position corresponding to the first injection port 131, further improving the structural consistency of the lower plastic 20 after cooling and solidification.

[0042] It should be pointed out that when the cover body 10 is located in the accommodating groove 110, the first wall 21 is in contact with the first side wall 121, and the second wall 22 is in contact with the second side wall 122. In this embodiment, the recessed area 23 refers to the first wall 21 being recessed in a direction away from the second wall 22, and the outward convex deformation of the recessed area 23 refers to the recessed area 23 protruding in a direction away from the second wall 22. The protruding area 24 refers to the second wall 22 protruding in a direction away from the first wall 21, and the inward concave deformation of the protruding area 24 refers to the protruding area 24 being recessed in a direction away from the first wall 21.

[0043] Furthermore, if Figures 1 to 6 As shown, the surface of the deformation zone 140 facing the first sealing plate 200 includes a second plane 141 and two second slopes 142. The second plane 141 is located between the two second slopes 142. Both sides of the second plane 141 are connected to a corresponding second slope 142. The second slope 142 is inclined from the side connected to the second plane 141 to the side away from the second plane 141 in a direction close to the first sealing plate 200. As a result, the second plane 141 corresponds to the first protruding plane 27 of the protruding area 24, and the two second slopes 142 are respectively connected to the two first protruding planes 27 of the protruding area 24. The protruding inclined surfaces 28 correspond to each other, that is, the protruding area 24 of the lower plastic 20 includes a first protruding plane 27 and two first protruding inclined surfaces 28. The first protruding plane 27 is located between the two first protruding inclined surfaces 28, and the two sides of the first protruding plane 27 are respectively connected to a corresponding first protruding inclined surface 28. When the lower plastic 20 cools and solidifies, the protruding area 24 is deformed inwardly to be relatively uniform, reducing the probability of a certain position of the protruding area 24 protruding outward and / or concave inward when the lower plastic 20 cools and solidifies, providing further protection for the overall structural consistency of the lower plastic 20.

[0044] This embodiment also provides a cover plate mold assembly, which can reduce the probability of the lower plastic 20 bulging and deforming outward during the cooling and solidification process.

[0045] Specifically, the cover mold assembly includes a battery cover and the above-mentioned cover injection mold, the battery cover includes a cover body 10 and a lower plastic 20, the cover body 10 is located in the receiving groove 110 and is detachably connected to the cover injection mold, the lower plastic 20 covers the surface of the cover body 10 on one side away from the bottom of the receiving groove 110, one side outer wall of the lower plastic 20 (that is, the outer surface of the first wall 21) is respectively fitted with the surface of the first side wall 121 facing the receiving groove 110 and the surface of the first sealing plate 200 facing the receiving groove 110, and the other side outer wall of the lower plastic 20 (that is, the second wall The outer surface of the second side wall 122 is fitted with the surface of the second side wall 122 facing the accommodating groove 110. After the lower plastic 20 is slightly solidified, the cover injection mold is removed to allow the lower plastic 20 to cool and solidify naturally. During the natural cooling and solidification process of the lower plastic 20, the recessed area 23 of the lower plastic 20 bulges outward, thereby compensating for the outward bulging deformation of the lower plastic 20 during the cooling and solidification process, reducing the probability of the lower plastic 20 bulging outward due to stress during cooling and solidification, which is beneficial to improving the accuracy of the battery cover sealing detection and also reduces the difficulty of installing the battery cover into the battery shell.

[0046] Furthermore, if Figure 7 As shown, the battery cover also includes a pole 30, which is passed through the cover body 10 and the lower plastic 20 and is fixedly connected to the cover body 10. One end of the pole 30 is used to be conductively connected to the battery cell of the battery body, and the other end of the pole 30 is used to be conductively connected to a conductive element outside the battery body.

[0047] Furthermore, if Figure 7 As shown, the pole 30 includes a base 31 and a column 32. The base 31 is located on the side of the lower plastic 20 away from the cover body 10 and is connected to the column 32. The column 32 is passed through the lower plastic 20 and the cover body 10 and is fixedly connected to the cover body 10. The lower plastic 20 is clamped between the base 31 and the cover body 10. Therefore, through the cooperation between the cover body 10 and the base 31, the area of ​​the lower plastic 20 close to the pole 30 is tightened and positioned.

[0048] Furthermore, if Figures 1 to 7As shown, a second glue injection port 132 is further provided on the first side wall 121, and liquid plastic can also be injected into the receiving groove 110 through the second glue injection port 132, and a lower plastic 20 is formed on the side of the cover body 10 away from the bottom of the receiving groove 110. The second glue injection port 132 is arranged close to the pole 30, and the cover injection mold further includes a second sealing plate 300, which is detachably connected to the first side wall 121 and covered at the second glue injection port 132. The design of the second glue injection port 132 can provide The efficiency of injecting liquid plastic into the receiving tank 110 is high, thereby having the effect of improving production efficiency. In addition, the second injection port 132 is set close to the pole 30. When the lower plastic 20 is cooling and solidifying, the cover body 10 and the base 31 can cooperate to tighten the area of ​​the lower plastic 20 close to the pole 30. That is, the cover body 10 and the base 31 can cooperate to tighten the area of ​​the lower plastic 20 close to the second injection port 132, reducing the probability of deformation of the lower plastic 20 in this area.

[0049] Alternatively, as Figures 1 to 7 As shown, the number of the second injection port 132, the second sealing plate 300 and the pole 30 are two and correspond one to one. The two second injection ports 132 are respectively located on both sides of the first injection port 131, and the two second injection ports 132 are spaced apart from the first injection port 131. On the one hand, the efficiency of injecting liquid plastic into the receiving groove 110 can be further improved. On the other hand, the two second injection ports 132 are respectively located on both sides of the first injection port 131, and the two second injection ports 132 are spaced apart from the first injection port 131. This design can reduce the mutual influence between the area corresponding to the first injection port 131 (i.e., the recessed area 23) and the area corresponding to the two second injection ports 132 when the lower plastic 20 is cooled and solidified, and has the effect of further improving the overall structural consistency of the lower plastic 20.

[0050] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Cover plate injection mold, used to form the lower plastic on one side surface of the cover plate body, characterized in that: The cover plate injection mold comprises: A mold body (100), the mold body (100) comprising a plurality of side walls, the plurality of side walls being sequentially connected end to end and enclosing a receiving groove (110), the plurality of side walls comprising a first side wall (121) and a second side wall (122) arranged opposite to each other, the first side wall (121) being provided with a first injection port (131), the cover body (10) being capable of being placed in the receiving groove (110), liquid plastic being capable of being injected into the receiving groove (110) through the first injection port (131), and forming the lower plastic (20) on a side of the cover body (10) facing away from the bottom of the receiving groove (110); A first sealing plate (200) is detachably connected to the first side wall (121) and covers the first glue injection port (131), and a surface of the first sealing plate (200) facing the second side wall (122) protrudes in a direction toward the second side wall (122).

2. The cover plate injection mold according to claim 1, characterized in that: The surface of the first sealing plate (200) facing the second side wall (122) includes a first plane (210) and two first slopes (220), the first plane (210) is located between the two first slopes (220), both sides of the first plane (210) are connected to a corresponding one of the first slopes (220), and the first slope (220) is inclined from the side connected to the first plane (210) to the side away from the first plane (210) in a direction away from the second side wall (122).

3. The cover plate injection mold according to claim 1, characterized in that: The second side wall (122) includes a deformation zone (140), and the deformation zone (140) is arranged opposite to the first sealing plate (200). The surface of the deformation zone (140) facing the first sealing plate (200) protrudes in a direction away from the first sealing plate (200).

4. The cover plate injection mold according to claim 3, characterized in that: The surface of the deformation zone (140) facing the first sealing plate (200) includes a second plane (141) and two second slopes (142), the second plane (141) is located between the two second slopes (142), both sides of the second plane (141) are connected to a corresponding second slope (142), and the second slope (142) is inclined from the side connected to the second plane (141) to the side away from the second plane (141) in a direction close to the first sealing plate (200).

5. Cover plate mold assembly, characterized in that, It comprises a battery cover and a cover injection mold according to any one of claims 1 to 4, wherein the battery cover comprises a cover body (10) and a lower plastic (20), the cover body (10) is located in the receiving groove (110) and is detachably connected to the cover injection mold, the lower plastic (20) covers the surface of the cover body (10) on one side facing away from the bottom of the receiving groove (110), one side outer wall of the lower plastic (20) is respectively fitted with the surface of the first side wall (121) facing the receiving groove (110) and the surface of the first sealing plate (200) facing the receiving groove (110), and the other side outer wall of the lower plastic (20) is fitted with the surface of the second side wall (122) facing the receiving groove (110).

6. The cover plate mold assembly according to claim 5, characterized in that: The battery cover also includes a pole (30), which is passed through the cover body (10) and the lower plastic (20) and is fixedly connected to the cover body (10).

7. The cover plate mold assembly according to claim 6, wherein: The pole (30) includes a base (31) and a column (32), wherein the base (31) is located on a side of the lower plastic (20) away from the cover body (10) and is connected to the column (32), and the column (32) is passed through the lower plastic (20) and the cover body (10) and is fixedly connected to the cover body (10), and the lower plastic (20) is clamped between the base (31) and the cover body (10).

8. The cover plate mold assembly according to claim 7, wherein: A second glue injection port (132) is also provided on the first side wall (121), and liquid plastic can also be injected into the receiving groove (110) through the second glue injection port (132), and the lower plastic (20) is formed on the side of the cover body (10) away from the bottom of the receiving groove (110). The second glue injection port (132) is arranged close to the pole (30), and the cover injection mold also includes a second sealing plate (300), which is detachably connected to the first side wall (121) and covers the second glue injection port (132).

9. The cover plate mold assembly according to claim 8, wherein: The number of the second glue injection ports (132), the second sealing plate (300) and the pole (30) are all two and they correspond one to one. The two second glue injection ports (132) are respectively located on both sides of the first glue injection port (131), and the two second glue injection ports (132) are spaced apart from the first glue injection port (131).

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