Injection mold and injection molding device

Abstract

The utility model belongs to the technical field of battery processing, and particularly discloses an injection mold and an injection molding device, the injection mold comprises a front mold and a rear mold, and the rear mold and the front mold are buckled together to define a cavity for injection molding of a lower plastic part. The front mold is provided with a traction part, and through friction force between the traction part and the lower plastic part, pulling force deviating from the direction of the supporting table can be applied to the end, in the length direction, of the lower plastic part when the front mold is separated from the lower plastic part, so that the end, in the length direction, of the lower plastic part forms reverse deformation in the direction deviating from the supporting table during demolding; and the reverse deformation amount can be counteracted with the bending deformation amount generated after the lower plastic part is demolded and cooled, so that it is guaranteed that the flatness of the cooled finished lower plastic part is good, the lower plastic part is not prone to warping after being assembled with the top cover, and the yield is high. The utility model further provides an injection molding device which comprises the injection mold.

Description

Technical Field

[0001] The utility model relates to the technical field of battery processing, in particular to an injection mold and an injection device. Background Art

[0002] As the primary power source for new energy vehicles, power batteries are facing increasingly stringent performance requirements, particularly regarding their energy density per unit volume. The battery cover assembly is a key parameter affecting its energy density per unit volume.

[0003] In existing technology, the energy density per unit volume of power batteries is often increased by reducing the thickness of the battery cover assembly. In such battery cover assemblies, the lower plastic component, located between the top cover and the terminal, is large in length and width but thin. This results in the lower plastic component being prone to warping and deformation at both ends of its length, away from the top cover, after demolding and cooling during injection molding, resulting in low product yield. Utility Model Content

[0004] The purpose of the utility model is to provide an injection mold and an injection molding device. The lower plastic part manufactured by the injection mold has good flatness, is not prone to warping after being assembled with a top cover, and has a high yield rate.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] In one aspect, the present invention provides an injection mold for injection molding a plastic part, the injection mold comprising:

[0007] A front mold, wherein the front mold is provided with a pulling portion;

[0008] A rear mold is engaged with the front mold, and the front mold and the rear mold together form a cavity for injecting the lower plastic part;

[0009] A liquid injection port is provided on the front mold or the rear mold, and the liquid injection port is communicated with the mold cavity.

[0010] Optionally, the front mold includes a mold body and an insert, one end of the insert is connected to a side of the mold body facing the cavity, and the pulling portion is provided on a peripheral side wall of the other end of the insert.

[0011] Optionally, there are a plurality of inserts, and the plurality of inserts are arranged at the ends of the mold body in the length direction, and the plurality of inserts are arranged in sequence along the width direction of the mold body.

[0012] Optionally, the pulling portion is a notch provided on the peripheral side wall of the insert, and the depth of the notch is 0.02 mm-0.08 mm.

[0013] Optionally, the shape of the notch is a mesh, a strip, a cross or a snowflake.

[0014] Optionally, the pulling portion is frosted particles provided on the peripheral side wall of the insert, and the roughness of the peripheral side wall of the insert is 0.02 mm-0.08 mm.

[0015] Optionally, the lower plastic part includes a first section and a second section, and two front molds and two rear molds are provided, wherein one front mold and one rear mold are used for injection molding the first section, and the other front mold and the other rear mold are used for injection molding the second section.

[0016] Optionally, the pulling portion is provided on the sides of the two front molds facing away from each other.

[0017] Optionally, the front mold or the rear mold for injection molding the first subsection is provided with a liquid injection port;

[0018] The front mold or the rear mold used for injection molding the second section is provided with a liquid injection port.

[0019] On the other hand, the present invention provides an injection molding device, comprising the injection mold in any of the above solutions.

[0020] The beneficial effects of the utility model are:

[0021] The utility model provides an injection mold, comprising a front mold and a back mold, wherein the back mold and the front mold are buckled together to form a cavity for injecting a lower plastic part. A pulling portion is provided at the end of the front mold in the longitudinal direction. Through the friction between the pulling portion and the lower plastic part, a pulling force can be applied to the end of the lower plastic part in the longitudinal direction away from the support platform during demolding, so that the end of the lower plastic part in the longitudinal direction forms a reverse deformation in the direction away from the support platform during demolding. The reverse deformation can be offset by the bending deformation generated by the lower plastic part after demolding and cooling, thereby ensuring that the flatness of the finished lower plastic part after cooling is good, and that it can be completely fitted to the top cover when assembled with the top cover, without the end of the lower plastic part in the longitudinal direction tilting away from the top cover, and the product yield is high.

[0022] The present invention also provides an injection molding device including the aforementioned injection mold. By employing the injection mold, a pulling portion provided on the front mold can apply a pulling force to the longitudinal end of the lower plastic part away from the support platform when the front mold is separated from the solidified lower plastic part, thereby ensuring good flatness of the lower plastic part after cooling, resulting in a high yield rate for the finished lower plastic part and high precision assembly with the top cover. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1It is a front view of the front mold provided in an embodiment of the present utility model;

[0024] Figure 2 It is a bottom view of the front mold provided in an embodiment of the present utility model;

[0025] Figure 3 This is a schematic structural diagram of the insert and the lower plastic part provided in an embodiment of the present utility model;

[0026] Figure 4 This is an exploded view of the insert and the lower plastic part provided in the embodiment of the present utility model;

[0027] Figure 5 This is a schematic diagram of the structure of the insert provided in the embodiment of the utility model Figure 1 ;

[0028] Figure 6 This is a schematic diagram of the structure of the insert provided in the embodiment of the utility model Figure 2 ;

[0029] Figure 7 This is a schematic diagram of the structure of the insert provided in the embodiment of the utility model Figure 3 ;

[0030] Figure 8 This is a schematic diagram of the structure of the insert provided in the embodiment of the utility model Figure 4 .

[0031] In the picture:

[0032] 100, lower plastic part; 110, first subsection; 120, second subsection; 130, support platform; 131, groove;

[0033] 200, front mold; 210, insert; 211, notch; 212, frosted particles; 220, mold body. DETAILED DESCRIPTION

[0034] 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.

[0035] 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.

[0036] 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.

[0037] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended solely to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0038] In the existing battery cover assembly, one side of the lower plastic part is connected to the top cover, and the other side of the lower plastic part is provided with a support platform, which can support the electrode group so that the electrode group is well fixed in the shell and not easy to shake. In order to reduce the weight of the lower plastic part, a groove is usually provided in the support platform of the lower plastic part, and the groove is provided toward the side of the top cover. The lower plastic part is usually formed by injection molding. After the lower plastic part is formed in the injection mold, if it is demolded before it is completely cooled, it is easy to cause the lower plastic part to bend, twist, and other deformations toward the side where the support platform is located. When the lower plastic part is assembled with the top cover, the two ends of the lower plastic part in the length direction are tilted toward the side away from the top cover, resulting in a low product yield.

[0039] This embodiment provides an injection mold, which can be used to inject a lower plastic part. The lower plastic part manufactured using the injection mold has good flatness, is less likely to warp after being assembled with a top cover, and has a high yield rate.

[0040] Specifically, if Figure 1-Figure 4As shown, the injection mold includes a front mold 200 and a back mold (not shown). When the back mold is engaged with the front mold 200, the front mold 200 and the back mold together form a cavity for injecting the lower plastic part 100. A liquid injection port is provided on the front mold 200 or the back mold, and the liquid injection port is connected to the above-mentioned cavity. Molten plastic can be injected into the cavity through the liquid injection port. After the plastic solidifies in the cavity, the molded lower plastic part 100 can be removed from the injection mold, which has high production efficiency.

[0041] A pulling portion is provided at the end of the front mold 200 in the longitudinal direction. Through the friction between the pulling portion and the lower plastic part 100, a pulling force can be applied to the end of the lower plastic part 100 in the longitudinal direction away from the support platform 130 during demolding (i.e., when the front mold 200 and the lower plastic part 100 are separated), so that the end of the lower plastic part 100 in the longitudinal direction forms a reverse deformation in the direction away from the support platform 130 during demolding. The reverse deformation can be offset by the bending deformation generated by the lower plastic part 100 after demolding and cooling, thereby ensuring that the finished lower plastic part 100 has good flatness after cooling, and can be completely fitted to the top cover when assembled with the top cover, without the end of the lower plastic part 100 in the longitudinal direction tilting away from the top cover, and the product yield is high. It should be noted that the longitudinal directions of the front mold 200 and the lower plastic part 100 are both Figure 1-Figure 4 The X-axis direction shown in FIG is the direction away from the support platform 130. Figure 1-Figure 4 The Z-axis direction.

[0042] Optionally, the front mold 200 in this embodiment includes a mold body 220 and an insert 210. One end of the insert 210 is connected to the side of the mold body 220 facing the mold cavity, and the other end of the insert 210 is provided with a pull portion on the peripheral sidewall. During injection molding, the insert 210 is used to form the groove 131 on the support platform 130 of the lower plastic part 100. During demolding, the pull portion on the insert 210 can apply a pulling force to the lower plastic part 100 away from the support platform 130, so that the reverse deformation of the lower plastic part 100 can offset the bending deformation of the lower plastic part 100 during demolding and cooling, ensuring its excellent flatness.

[0043] Furthermore, in this embodiment, there are a plurality of inserts 210, which are arranged at the ends of the length direction of the mold body 220, and the plurality of inserts 210 are arranged in sequence along the width direction of the mold body 220. Figure 1-Figure 4 The X-axis direction shown in FIG, the width direction of the mold body 220 is Figure 1-Figure 4. For example, in this embodiment, six inserts 210 are provided at one end of the mold body 220 in the longitudinal direction. The six inserts 210 are arranged sequentially along the width direction of the mold body 220. Six grooves 131 are provided on the support platform 130 at one end of the lower plastic part 100 in the longitudinal direction after injection molding.

[0044] See also Figure 4 and Figure 5 In this embodiment, the pulling portion is a notch 211 provided on the sidewall of the insert 210. The notch 211 can be machined. The depth of the notch 211 is 0.02 mm to 0.08 mm. For example, the depth of the notch 211 can be 0.02 mm, 0.04 mm, 0.06 mm, or 0.08 mm. The notch 211 can be shaped like a mesh.

[0045] In some embodiments, the shape of the notch 211 can also be a long strip (see Figure 6 ), long strips of notches 211 and Figure 1-Figure 4 The XY plane is parallel to the

[0046] Of course, in other embodiments, the shape of the notch 211 may also be a cross or a snowflake (see Figure 7 Cross-shaped or snowflake-shaped notches 211 are distributed at intervals on the peripheral sidewall of the insert 210 .

[0047] Optionally, in some embodiments, the pulling portion may also be abrasive particles 212 disposed on the peripheral side wall of the insert 210 (see Figure 8 ), the frosted particles 212 can be formed by grinding the insert 210. The roughness of the sidewall of the insert 210 at the location of the pulling portion is 0.02 mm to 0.08 mm. For example, the roughness of the sidewall of the insert 210 is 0.02 mm, 0.04 mm, 0.06 mm, or 0.08 mm.

[0048] The above-mentioned notches 211 and frosted particles 212 can increase the friction between the insert 210 and the lower plastic part 100, so that when the front mold 200 and the lower plastic part 100 are separated, the insert 210 can apply a pulling force to the lower plastic part 100 away from the support platform 130, ultimately making the surface of the cooled lower plastic part 100 smooth.

[0049] Further, see Figure 1-Figure 4 The lower plastic part 100 in this embodiment includes a first sub-part 110 and a second sub-part 120. The first sub-part 110 and the second sub-part 120 are arranged along Figure 1-Figure 4By separating the lower plastic part 100, the size of the lower plastic part 100 along the X-axis direction can be reduced, further alleviating the deformation problem of the lower plastic part 100, and improving the yield rate of the product.

[0050] Accordingly, two front molds 200 and two rear molds are provided. One front mold 200 and rear mold, when engaged, form a cavity. This cavity can be used to inject the first section 110 of the lower plastic part 100. The other front mold 200 and rear mold, when engaged, also form a cavity. This cavity can be used to inject the second section 120 of the lower plastic part 100. The two front molds 200 are each provided with the aforementioned inserts 210 on their opposite sides. Six inserts 210 are spaced apart along the width of the mold body 220. Each insert 210 is provided with a pulling portion. This allows the front mold 200 to apply a uniform pulling force to the longitudinal ends of the lower plastic part 100 when the lower plastic part 100 is separated from the front mold 200.

[0051] Optionally, the front mold 200 used for molding the first subsection 110 has an injection port, and the front mold 200 used for molding the second subsection 120 also has an injection port, to facilitate injecting molten plastic into both mold cavities. Alternatively, in other embodiments, the rear mold used for molding the first subsection 110 has an injection port, and the rear mold used for molding the second subsection 120 also has an injection port.

[0052] This embodiment also provides an injection molding device, including a frame, a glue feeding module, an ejection module, a front mold base, a rear mold base and the above-mentioned injection mold. The front mold base and the rear mold base are both arranged on the frame, and the front mold base and the rear mold base can be close to or away from each other. The front mold 200 of the injection mold is arranged on the front mold base, and the rear mold of the injection mold is arranged on the rear mold base. The front mold base and the rear mold base approach each other until the front mold 200 abuts against the rear mold, and the front mold 200 and the rear mold surround the molding cavity. The glue feeding module is connected to the liquid injection port on the front mold 200, and molten plastic can be injected into the mold cavity through the glue feeding module. The ejection module is arranged on the rear mold base, and the movable end of the ejection module is passed through the rear mold. The solidified lower plastic part 100 can be ejected through the ejection module.

[0053] By adopting this injection mold, the pulling portion provided on the front mold 200 can apply a pulling force to the end of the lower plastic part 100 in the length direction away from the support platform 130 when the front mold 200 is separated from the solidified lower plastic part 100, so that the flatness of the lower plastic part 100 after cooling is good, the product yield of the lower plastic part 100 after injection molding is high, and the assembly accuracy with the top cover is high.

[0054] 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. An injection mold for injection molding a lower plastic part (100), characterized in that: The injection mold comprises: A front mold (200), wherein the front mold (200) is provided with a pulling portion; A rear mold is engaged with the front mold (200), and the front mold (200) and the rear mold together form a cavity for injection molding the lower plastic part (100); A liquid injection port is provided on the front mold (200) or the rear mold, and the liquid injection port is communicated with the mold cavity.

2. The injection mold according to claim 1, characterized in that The front mold (200) comprises a mold body (220) and an insert (210), one end of the insert (210) is connected to the side of the mold body (220) facing the mold cavity, and the pulling portion is provided on the peripheral side wall of the other end of the insert (210).

3. The injection mold according to claim 2, characterized in that A plurality of inserts (210) are provided, and the plurality of inserts (210) are arranged at the ends of the length direction of the mold body (220), and the plurality of inserts (210) are arranged in sequence along the width direction of the mold body (220).

4. The injection mold according to claim 2, characterized in that The pulling portion is a notch (211) provided on the peripheral side wall of the insert (210), and the depth of the notch (211) is 0.02 mm to 0.08 mm.

5. The injection mold according to claim 4, characterized in that: The shape of the notch (211) is a mesh, a strip, a cross or a snowflake.

6. The injection mold according to claim 2, characterized in that The pulling portion is frosted particles (212) arranged on the peripheral side wall of the insert (210), and the roughness of the peripheral side wall of the insert (210) is 0.02 mm-0.08 mm.

7. The injection mold according to claim 2, characterized in that: The lower plastic part (100) includes a first section (110) and a second section (120), and two front molds (200) and two rear molds are provided, wherein one front mold (200) and one rear mold are used for injection molding the first section (110), and the other front mold (200) and the other rear mold are used for injection molding the second section (120).

8. The injection mold according to claim 7, characterized in that: The pulling portion is provided on one side of the two front molds (200) facing away from each other.

9. The injection mold according to claim 7, characterized in that: The front mold (200) or the rear mold for injection molding the first subsection (110) is provided with a liquid injection port; The liquid injection port is provided on the front mold (200) or the rear mold for injection molding the second subsection (120).

10. An injection molding device, characterized in that: The invention comprises the injection mold according to any one of claims 1 to 9.

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