A charging module with anti-electromagnetic interference function

Abstract

The application discloses a charging module with an anti-electromagnetic interference function, and belongs to the technical field of electric vehicle charging. The module comprises a cable, a magnetic ring, a first clasp, a second clasp and a plastic shell. The magnetic ring is sleeved on the cable; the first clasp and the second clasp are respectively arranged at the two axial ends of the magnetic ring and are fixed on the cable, and are used for limiting the axial sliding of the magnetic ring along the cable; the plastic shell is coated outside the magnetic ring and the two clasps through an injection molding process, and the two ends of the plastic shell extend to the outside of the clasps and form a sealed lap joint with the outer sheath of the cable. The application realizes axial limiting of the magnetic ring through the clasps, and prevents displacement; the plastic shell formed through injection molding realizes full-sealing protection, and has high waterproof and dustproof levels. The module has a compact structure, is durable and reliable, and is suitable for charging gun scenes that are frequently moved and used outdoors.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle charging technology, and more specifically, to a charging module with anti-electromagnetic interference function. Background Technology

[0002] Electric vehicle charging guns typically include a charging plug, a control box, and connecting cables. During charging, the power devices and switching circuits inside the control box generate strong electromagnetic interference. This interference can be conducted and radiated along the connecting cables, affecting the stability of charging communication and even interfering with other onboard electronic devices.

[0003] To suppress electromagnetic interference, ferrite magnetic rings are often placed on the cables of charging guns in existing technologies. There are two common installation methods: one is to use a snap-on magnetic ring to directly clamp onto the cable, and the other is to put the magnetic ring on the cable and then wrap it with heat shrink tubing or electrical tape.

[0004] However, the above methods have obvious shortcomings in actual use: First, the charging gun cable needs to be frequently bent and moved during use, and the snap-on magnetic ring is prone to sliding along the cable and cannot be stably maintained in the best anti-interference position (such as near the control box); Second, the snap-on magnetic ring is made of two halves spliced ​​together, and its joints have poor sealing and low protection level, making it easy for moisture and dust to penetrate; Finally, simply wrapping it with heat shrink tubing or tape has poor durability, cannot effectively protect the magnetic ring for a long time, and cannot prevent its oxidation and aging. Summary of the Invention

[0005] The present invention aims to provide a charging module with anti-electromagnetic interference function to solve the problems of easy displacement of magnetic ring, poor protection and short durability in the prior art.

[0006] To achieve the above objectives, the present invention provides a charging module with anti-electromagnetic interference function, comprising:

[0007] cable;

[0008] A magnetic ring is fitted onto the cable;

[0009] The first retaining ring and the second retaining ring are respectively disposed at both ends of the magnetic ring along the axial direction and fixedly connected to the cable. The two retaining rings are used to restrict the magnetic ring from sliding along the axial direction of the cable.

[0010] A plastic shell is formed by injection molding and covers the outside of the magnetic ring, the first retaining ring, and the second retaining ring.

[0011] The two ends of the plastic shell extend to the axial outer sides of the first retaining ring and the second retaining ring, respectively, and form a sealed overlap with the outer sheath of the cable.

[0012] Furthermore, the plastic shell is made of an elastomeric material. Specifically, the elastomeric material is a thermoplastic elastomer (TPE), a thermoplastic polyurethane (TPU), or a liquid silicone rubber (LSR).

[0013] Furthermore, the magnetic ring is composed of multiple segments, preferably three segments.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. By setting retaining rings at both ends of the magnetic ring and fixing them to the cable, the axial positioning of the magnetic ring is achieved, ensuring that it is always in the optimal anti-interference position (such as 20cm~50cm away from the control box). Even if the cable is frequently bent or moved, the magnetic ring will not slip.

[0016] 2. A plastic shell is formed by injection molding to cover the magnetic ring and the retaining ring, and the two ends of the plastic shell form a sealed overlap with the cable sheath (overlap length ≥ 5mm), forming a seamless, fully sealed structure, which effectively improves the protection level of waterproofing, dustproofing and oxidation prevention.

[0017] 3. The plastic shell is made of an elastomer material (such as TPE, TPU, or LSR), which has good elastic deformation capability. When the charging gun cable is impacted or dropped during use, the plastic shell can protect the internal magnetic ring.

[0018] 4. This module has a compact structure, is durable and reliable, and is suitable for charging gun scenarios that require frequent relocation and outdoor use. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the external structure of the charging module.

[0020] Figure 2 This is a schematic diagram of the internal structure of the charging module.

[0021] Figure 3 This is a cross-sectional structural diagram of the charging module. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. It should be noted that the following embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention.

[0023] Example 1

[0024] like Figures 1 to 3 As shown, this embodiment provides a charging module with anti-electromagnetic interference function, including a cable 1, a magnetic ring 2, a first retaining ring 3, a second retaining ring 4, and a plastic shell 5.

[0025] Cable 1 is a multi-core composite cable for charging guns, which includes power lines, signal lines and ground lines. Its outer sheath is made of weather-resistant insulating material (such as TPE or TPU).

[0026] The magnetic ring 2 is a circular sintered ferrite magnetic ring with an inner diameter slightly larger than the outer diameter of the cable 1, and is slidably fitted onto the cable 1. The magnetic ring 2 is preferably positioned 20cm to 50cm from the cable input end of the control box to suppress common-mode interference generated by the control box. In this embodiment, the magnetic ring 2 has a three-segment structure, with the three segments sequentially fitted onto the cable 1.

[0027] The first retaining ring 3 and the second retaining ring 4 are respectively set tightly against the axial ends of the magnetic ring 2 and firmly fixed to the cable 1. In this embodiment, the retaining rings are cable ties. The cable ties are wrapped around the cable 1 and tightened to form a ring-shaped limiting structure, which is tightly against the end face of the magnetic ring 2 to achieve axial limiting. The two retaining rings together restrict the axial movement of the magnetic ring 2 along the cable 1, preventing it from sliding due to cable bending or movement. Of course, the retaining rings can also be open rings, fastening buckles, or rings formed by splicing two half-rings.

[0028] The plastic shell 5 is formed in one piece by injection molding, completely covering the outside of the magnetic ring 2, the first retaining ring 3, and the second retaining ring 4, and its two ends extend to the axial outer side of the two retaining rings respectively, forming a sealed overlap with the outer sheath of the cable 1, with an overlap length ≥ 5mm.

[0029] The plastic shell 5 is made of an elastomer material, specifically thermoplastic polyurethane (TPU) in this embodiment. The TPU injection-molded shell 5 is elastic, protecting the internal magnetic ring 2 when the charging gun cable is impacted or dropped during use. Simultaneously, the seamless injection molding structure and the sealed overlap design at both ends prevent moisture and dust from entering, ensuring the long-term reliable anti-interference performance of the magnetic ring 2. Of course, the elastomer material can also be thermoplastic elastomer (TPE) or liquid silicone (LSR).

[0030] To ensure the coaxiality of the magnetic ring and the cable and prevent the magnetic ring from shifting, multiple ejector pins are installed on the inner wall of the injection cavity of the molded plastic shell. The multiple ejector pins are distributed around the circumference of the magnetic ring, and the magnetic ring is positioned by the ejector pins, thereby controlling the coaxiality of the magnetic ring and the cable.

[0031] It should be noted that the magnetic ring 2 is pre-molded onto the cable 1 using an injection molding process, and the connection point between the magnetic ring 2 and the cable 1 is located 20cm to 50cm from the end of the cable. This pre-molded component is shipped as a standard product during factory production. During on-site installation, operators cut the cable or adjust the position of the magnetic ring relative to the control box based on the location of the control box, ultimately ensuring that the magnetic ring 2 is in the optimal working position.

[0032] The above embodiments do not limit the present invention in any way. All technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of the present invention.

Claims

1. A charging module with anti-electromagnetic interference function, characterized in that, include: cable; A magnetic ring is fitted onto the cable; The first retaining ring and the second retaining ring are respectively disposed at both ends of the magnetic ring along the axial direction and fixedly connected to the cable. The two retaining rings are used to restrict the magnetic ring from sliding along the axial direction of the cable. A plastic shell is formed by injection molding and covers the outside of the magnetic ring, the first retaining ring, and the second retaining ring. The two ends of the plastic shell extend to the axial outer sides of the first retaining ring and the second retaining ring, respectively, and form a sealed overlap with the outer sheath of the cable.

2. A charging module with anti-electromagnetic interference function according to claim 1, characterized in that: The plastic shell is made of an elastomer material.

3. A charging module with anti-electromagnetic interference function according to claim 2, characterized in that: The elastomer material is a thermoplastic elastomer, thermoplastic polyurethane, or liquid silicone.

4. A charging module with anti-electromagnetic interference function according to claim 1, characterized in that: The magnetic ring is composed of multiple segments.

5. A charging module with anti-electromagnetic interference function according to claim 4, characterized in that: The magnetic ring is composed of three sections.

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