Battery pack circuit breaking unit bottom shell injection mold

Abstract

The utility model discloses a battery pack circuit breaking unit bottom shell injection mold, including upper die and lower die, and the positioning mechanism that mould core is equipped with aluminum radiating fin cooperation, positioning mechanism insert fixed base is mountain letter shape, and movable insert can slide along guide rod, and can automatically fine tune spacing adaptation different tolerance aluminum radiating fin, and the overflow groove is formed to the mold, and the aluminum radiating fin is firmly clamped after plastic melt solidification, and the sealing structure is formed to the cooperation place of mould core and mould seat, and the sealing property is strengthened, and the cooling channel that surrounds mould core and mould seat is equipped with upper and lower die, can cool down fast, improve production efficiency, and guarantee product quality.

Description

Technical Field

[0001] This utility model relates to the field of injection molding technology, and in particular to an injection mold for the bottom shell of a battery pack circuit breaker unit. Background Technology

[0002] In fields such as new energy vehicles, the battery pack circuit breaker unit is a key component to ensure the safe operation of the battery system. It contains several power devices and generates a lot of heat during operation. To enhance heat dissipation, aluminum fin inserts are usually installed on the bottom shell of the battery pack circuit breaker unit.

[0003] However, aluminum fins are generally manufactured using an extrusion molding process, which is affected by various factors, resulting in highly unstable dimensional tolerances for the fins. This makes it difficult to ensure precise assembly when fitting the aluminum fin inserts to the injection mold. Forcing the mold to close can easily wear down the mold, and gaps created after repeated use can allow molten plastic to seep in, resulting in burrs and flash on the edges of the product. This not only affects the appearance quality of the battery pack circuit breaker unit's bottom shell, increasing subsequent processing costs and scrap rates, but also shortens the mold's lifespan and increases production costs. Utility Model Content

[0004] The purpose of this utility model is to overcome the above-mentioned technical deficiencies and propose a battery pack circuit breaker unit bottom shell injection mold to solve the problems mentioned in the background art.

[0005] To achieve the above technical objectives, the present invention provides a battery pack circuit breaker unit bottom shell injection mold, comprising: an upper mold and a lower mold, wherein the upper mold and the lower mold are respectively provided with a matching mold core and a mold base, the mold core is provided with a positioning mechanism that cooperates with an aluminum heat sink, the positioning mechanism includes an insert fixing seat, the insert fixing seat is mountain-shaped, and a guide rod is provided on it that extends through the width direction, and a plurality of movable inserts are provided in the grooves on both sides of the insert fixing seat, the movable inserts being slidably disposed on the guide rod and cooperating with the gaps of the fins of the aluminum heat sink.

[0006] Furthermore, the lower part of the movable insert is a rectangular block with the same width as the lower part of the insert fixing base, and the upper part of the movable insert and the upper part of the vertical section in the middle of the insert fixing base are both trapezoidal blocks. The length of the top surface of the trapezoidal block is equal to the width of the aluminum heat sink, and the length of the bottom surface is greater than the width of the aluminum heat sink and less than the length of the rectangular block. The distance between the bottom and top edges of two adjacent trapezoidal blocks is less than or equal to the thickness of the top and bottom of the fins of the aluminum heat sink.

[0007] Furthermore, the guide rod is provided with an elastic buffer, which is located between the movable insert and the groove wall of the insert fixing seat.

[0008] Furthermore, the mating points of the mold core and the mold base are respectively provided with a sealing groove and a sealing protrusion, with an elastic silicone strip nested inside the sealing groove, and a wedge-shaped chamfer added to the end of the sealing protrusion.

[0009] Furthermore, both the upper mold and the lower mold are provided with cooling channels. The cooling channels are spiral or meandering channels surrounding the mold core and the mold base. The two ends of the cooling channels are respectively connected to a coolant inlet and a coolant outlet.

[0010] Compared with the prior art, the beneficial effects of this utility model include: 1. In the positioning mechanism of this utility model, the movable insert can slide on the guide rod and automatically adjust the spacing according to the actual size of the aluminum heat sink, effectively adapting to aluminum heat sinks with different tolerances. After the mold is closed, the positioning mechanism and the fins of the aluminum heat sink form an overflow groove. After the plastic melt flows in and solidifies, it can firmly clamp the aluminum heat sink in the bottom shell. This not only solves the problem of flash and burrs caused by fit issues, improving the appearance quality and assembly accuracy of the bottom shell, but also enhances the connection stability between the aluminum heat sink and the bottom shell, ensuring the heat dissipation performance and overall reliability of the battery pack circuit breaker unit.

[0011] 2. This utility model features a sealing groove and a sealing protrusion at the joint between the mold core and the mold base, with an elastic silicone strip nested inside. The end of the sealing protrusion has a wedge-shaped chamfer, which greatly enhances the mold's sealing performance, effectively preventing leakage of molten plastic during injection and reducing the scrap rate. At the same time, the upper and lower molds are equipped with spiral or meandering cooling channels surrounding the mold core and mold base. The circulating coolant can quickly remove the heat from the injection process, shortening the production cycle and improving production efficiency. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of an injection mold for the bottom shell of a battery pack circuit breaker unit provided by this utility model; Figure 2 This is a schematic diagram of the positioning mechanism of the injection mold for the bottom shell of a battery pack circuit breaker unit, which is used in conjunction with an aluminum heat sink. Figure 3 This is a schematic diagram of the positioning mechanism of the injection mold for the bottom shell of a battery pack circuit breaker unit provided by this utility model; Figure 4 This is an enlarged view of the aluminum heat sink embedded in the bottom shell of the battery pack circuit breaker unit. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0014] Reference Figure 1 , Figure 2 This utility model provides an injection mold for the bottom shell of a battery pack circuit breaker unit, including an upper mold 1 and a lower mold 2. The upper mold 1 and the lower mold 2 are respectively provided with a matching mold core and a mold base. The bottom shell 3 of the battery pack circuit breaker unit is formed on the mold base. An aluminum heat sink 5 is embedded in the bottom shell 3 of the battery pack circuit breaker unit. A positioning mechanism 4 that cooperates with the aluminum heat sink 5 is provided on the mold core.

[0015] Reference Figure 3 The positioning mechanism 4 includes a mountain-shaped insert fixing seat 401, on which a guide rod 402 extends through in the width direction. Several movable inserts 403 are arranged in the grooves on both sides of the insert fixing seat 401, and the movable inserts 403 are slidably arranged on the guide rod 402. The lower part of the movable insert 403 is a rectangular block with the same width as the lower part of the insert fixing seat 401, and the upper part is a trapezoidal block. At the same time, the upper part of the vertical section in the middle of the insert fixing seat 401 is also a trapezoidal block. The distance between the bottom and top edges of two adjacent trapezoidal blocks is less than or equal to the thickness of the top and bottom of the fins of the aluminum heat sink 5. When the aluminum heat sink 5 is inserted, the fins push the movable insert 403 to slide along the guide rod 402. The gap between the movable inserts 403 is used to automatically fine adjust the distance between two adjacent movable inserts 403 to adapt to the tolerance of different aluminum heat sinks 5. After the mold is closed, the top of the fins of the aluminum heat sink 5 seals the gap between the two movable inserts 403.

[0016] Reference Figure 4 The top surface length of the trapezoidal block is equal to the width of the aluminum heat sink 5, and the bottom surface length is greater than the width of the aluminum heat sink 5 and less than the length of the rectangular block. This arrangement forms an overflow groove 404 with the positioning mechanism 4 and the fins of the aluminum heat sink 5 after the mold is closed. The pads 302 that contact the two sides of the fins of the aluminum heat sink 5 after the plastic melt solidifies, and the side wall of the receiving groove 302 in the finished product clamps the aluminum heat sink 5 through the pads 302, further holding the aluminum heat sink 5 in the bottom shell 3 of the battery pack circuit breaker unit.

[0017] To improve the durability of the positioning mechanism 4, an elastic buffer is provided on the guide rod 402. The elastic buffer is located between the movable insert 403 and the groove wall of the insert fixing seat 401, which can buffer the impact force when the movable insert 403 slides and ensure the stability of the positioning.

[0018] Meanwhile, the mold core and mold base are respectively provided with sealing grooves and sealing protrusions at the mating points. An elastic silicone strip is nested in the sealing groove. The mating of the sealing groove and sealing protrusion, together with the elastic sealing effect of the elastic silicone strip, can greatly enhance the sealing effect and effectively prevent the leakage of plastic melt during injection molding. A wedge-shaped chamfer is added to the end of the sealing protrusion to facilitate accurate mating of the mold core and mold base.

[0019] In addition, cooling channels are provided on both the upper mold 1 and the lower mold 2. The cooling channels are spiral-shaped (or meandering) and surround the mold core and mold base. The two ends of the cooling channels are connected to the coolant inlet and the coolant outlet, respectively. The heat generated during the injection molding process can be quickly removed by circulating coolant, thereby improving production efficiency.

[0020] The specific embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any other corresponding changes and modifications made based on the technical concept of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A battery pack circuit breaker unit bottom shell injection mold, comprising an upper mold and a lower mold, wherein the upper mold and the lower mold are respectively provided with a matching mold core and a mold base, characterized in that: The mold core is provided with a positioning mechanism that cooperates with the aluminum heat sink. The positioning mechanism includes an insert fixing seat, which is mountain-shaped and has a guide rod that runs through it along the width direction. Several movable inserts are provided in the grooves on both sides of the insert fixing seat. The movable inserts are slidably disposed on the guide rod and cooperate with the gap between the fins of the aluminum heat sink.

2. The battery pack circuit unit bottom shell injection mold of claim 1, wherein: The lower part of the movable insert is a rectangular block with the same width as the lower part of the insert fixing base. The upper part of the movable insert and the upper part of the vertical section in the middle of the insert fixing base are both trapezoidal blocks. The length of the top surface of the trapezoidal block is equal to the width of the aluminum heat sink, and the length of the bottom surface is greater than the width of the aluminum heat sink and less than the length of the rectangular block. The distance between the bottom and top edges of two adjacent trapezoidal blocks is less than or equal to the thickness of the top and bottom of the fins of the aluminum heat sink.

3. The injection mold for the bottom shell of a battery pack circuit breaker unit according to claim 2, characterized in that: An elastic buffer is provided on the guide rod, and the elastic buffer is located between the movable insert and the groove wall of the insert fixing seat.

4. The battery pack circuit unit bottom shell injection mold according to claim 2 or 3, characterized in that: The mold core and the mold base are respectively provided with a sealing groove and a sealing protrusion at the mating point. An elastic silicone strip is nested in the sealing groove, and a wedge-shaped chamfer is added to the end of the sealing protrusion.

5. The battery pack circuit unit bottom case injection mold of claim 4, wherein: Both the upper mold and the lower mold are provided with cooling channels. The cooling channels are spiral or meandering channels that surround the mold core and the mold base. The two ends of the cooling channels are respectively connected to a coolant inlet and a coolant outlet.

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