A connector for a hot plate

Abstract

The utility model discloses a kind of connectors of heating plate, belong to heater structure technical field, including injection body and connecting terminal, the middle part of connecting terminal is located in the injection body, the connecting terminal includes welding portion, is equipped with partition on the injection body and on the both sides of the welding portion, the injection body and two adjacent the partition form semi-closed area, the welding portion is located in the semi-closed area.This scheme is arranged with partition on connector, relatively closed space is formed by partition and injection body, so that the connecting terminal of connector can be located in this semi-closed area, so that partition is formed between terminal and terminal, avoid metal migration in high humidity environment, while subsequent addition of three-proof paint can also make three-proof paint located in the relatively closed space, improve the insulation effect between terminal.

Description

Technical Field

[0001] This utility model relates to a connection structure, and more specifically, to a connector for a heating plate. Background Technology

[0002] In the current automotive heater market, insulation failure of high-voltage connectors under high humidity conditions is a common problem. After injection molding, to ensure the welding quality of the connection terminals, the welding surface of the terminals needs to be shaped to make it flush with the heating plate pads. During the shaping process, the surface plating is damaged, exposing the copper material inside to the air. When exposed to high humidity, water acts as a carrier, causing the copper material to migrate under the influence of the potential difference between the pads, leading to electrochemical corrosion and insulation failure of the heating component. Most designs on the market, while considering plastic covering more of the metal terminal parts, do not add partitions between adjacent terminal pads.

[0003] For example, Chinese Patent Publication No. CN204760567U, published on November 11, 2015, entitled "L-shaped Connecting Terminal for Insulated Wire," discloses a connecting structure comprising an integral L-shaped connecting terminal consisting of an L-shaped conductive connector and an L-shaped rigid insulating sleeve that insulates and seals the L-shaped conductive connector, and an insulating rubber tube. The L-shaped conductive connector has internal and external threaded connections at both ends. The insulating rubber tube has unequal diameters at both ends; the larger diameter end connects to the outer wall of one end of the L-shaped rigid insulating sleeve, and the smaller diameter end connects to the outer wall of the insulating layer of the insulated wire, thus insulating and sealing the lug of the insulated wire. The inner diameter of the larger diameter end is not greater than the outer diameter of the corresponding connecting end of the L-shaped rigid insulating sleeve. The lug of the insulated wire passes through the insulating rubber tube and is threadedly connected to the conductive connector of the connecting terminal. When the L-shaped connecting terminal is connected to the outside, it only contacts the rigid insulating material, allowing for live connection and avoiding safety hazards such as discharge, short circuit, and electric shock during connection. However, this solution cannot effectively block the electrochemical reactions that occur at the connection terminals in high humidity environments, which can easily lead to insulation failure of the connection terminals. Utility Model Content

[0004] This invention overcomes the problem that existing heating plate connectors cannot be used in high humidity environments, and provides a connector for heating plates. This solution can effectively block metal migration between terminals in the connector, prevent electrochemical corrosion of the terminals, and avoid insulation failure of the heating components.

[0005] To solve the above-mentioned technical problems, this utility model adopts the following technical solution: a connector for a heating plate, comprising an injection-molded body and connecting terminals. The middle portion of the connecting terminal is located within the injection-molded body. The connecting terminal includes a welding portion. Partition portions are provided on the injection-molded body and on both sides of the welding portion. The injection-molded body and two adjacent partition portions form a semi-enclosed area, and the welding portion is located within the semi-enclosed area. This solution arranges partition portions on the connector, forming a relatively enclosed space through the partition portions and the injection-molded body. This allows the connecting terminals of the connector to be located within this semi-enclosed area, creating a barrier between the terminals and preventing metal migration in high-humidity environments. Furthermore, the subsequent addition of conformal coating also ensures that the conformal coating is located within this relatively enclosed space, improving the insulation effect between the terminals.

[0006] Preferably, the end of the partition portion away from the injection molded body corresponds to the end of the weld portion away from the injection molded body. The ends of the partition portion and the weld portion away from the injection molded body need to be aligned to prevent the outer end of the weld portion from protruding outside the two partition portions, which could lead to electrochemical corrosion of the external terminal portion.

[0007] Preferably, the welded portion has a bent structure, comprising a connecting portion located within the injection molded body and a welded end exposed outside the injection molded body. The connecting portion is positioned higher than the welded end, and the lower surface of the welded end is flush with the lower surface of the partition portion. The bent structure and the higher position of the connecting portion ensure that only the welded end contacts the pad surface, preventing the entire welded portion from contacting the pad and increasing the possibility of gap formation. The flush alignment of the lower surface of the welded end with the lower surface of the partition portion allows the lower surface of the partition portion to also align with the pad surface.

[0008] Preferably, the welding end has a bubble-point structure and a welding boss is formed on the lower surface of the welding end. The bubble-point structure on the welding end can improve the welding quality of the welding end, and the welding boss on the lower surface of the welding end can reduce the gap between the welding end and the solder pad, effectively avoiding the phenomenon of cold solder joint.

[0009] Preferably, the connection terminal further includes a plug-in portion, the end of which near the injection molded body is covered by the injection molded body and connected to the connection portion, while the end of which is away from the injection molded body is exposed outside the injection molded body. The plug-in portion is used for connecting the connector and the PCBA board. Only the part of the plug-in portion exposed outside the injection molded body is used for plugging into the PCBA board; the remaining part needs to be insulated.

[0010] Preferably, the connecting terminals are provided in multiples, and a set of partitions is provided between the connecting terminals. Generally, multiple connecting terminals are provided, and only one set of partitions is needed between adjacent connecting terminals, thus reducing the number of partitions.

[0011] Preferably, the injection molded body is provided with mounting holes. The mounting holes allow the entire injection molded body to be fixedly mounted on the heating plate, facilitating the connection between the terminals and the heating plate.

[0012] Preferably, the partition is made of insulating material, and the partition and the injection-molded body are integrally formed. Using insulating material for the partition can effectively ensure the insulation effect between the terminals.

[0013] Compared with the prior art, the beneficial effects of this utility model are: (1) The partition between the connecting terminals can effectively prevent the copper material from migrating in a high humidity environment and avoid the exposed copper material from undergoing electrochemical corrosion and insulation failure; (2) The stamping of bubble point structure on the welding surface of the connecting terminals is beneficial to the positioning of the connecting terminals and improves the welding quality; (3) The partition can also effectively block the flow of the three-proof paint at the solder pad position, ensuring that the three-proof paint covers the solder joint and the exposed metal part of the terminal, thus protecting the connecting terminals. Attached Figure Description

[0014] Figure 1 This is an isometric view of the present invention.

[0015] Figure 2 This is a top view of the present invention.

[0016] Figure 3 This is a cross-sectional view of the present invention.

[0017] Figure 4 This is a schematic diagram showing the connection between the connector and the heating plate of this utility model.

[0018] Figure 5 This is a cross-sectional view showing the connection between the connector and the heating plate of this utility model.

[0019] In the figure: 1. Injection body, 11. Mounting base, 12. Mounting hole, 2. Connecting terminal, 21. Welding part, 211. Connecting part, 212. Welding end, 22. Insertion part, 3. Partition part, 4. Semi-enclosed area, 5. Bubble point structure, 51. Welding boss, 7. Heating plate, 71. Welding pad, 72. U-shaped mounting port. Detailed Implementation

[0020] The technical solution of this utility model will be further described in detail below through specific embodiments and in conjunction with the accompanying drawings.

[0021] Example 1: As Figures 1 to 5The connector for a heating plate shown includes an injection-molded body 1 and a connecting terminal 2 located within the injection-molded body 1. The connecting terminal 2 consists of two parts: a soldering part 21 and a plugging part 22. Both the soldering part 21 and the plugging part 22 are made of copper, which has good conductivity. The soldering part 21 is arranged horizontally, and the plugging part 22 is arranged vertically. The soldering part 21 and the plugging part 22 are vertically connected to form the connecting terminal 2. The middle part of the connecting terminal 2 is located within the injection-molded body 1. That is, the connection part of the soldering part 21 and the plugging part 22, as well as most of them, are located within the injection-molded body 1. Only a portion of the soldering part 21 is exposed outside the injection-molded body 1 to form a soldering end, and only a portion of the plugging part 22 is exposed outside the injection-molded body 1 to form a plugging end.

[0022] Several sets of connecting terminals 2 are arranged on the injection molded body 1. In this embodiment, three sets of connecting terminals 2 are arranged in total. The three sets of connecting terminals 2 are arranged in parallel (spaced side by side) on the injection molded body 1. A partition 3 is also provided on the injection molded body 1. The partition 3 can block adjacent connecting terminals 2 and also make the position of the solder pad 71 of the heating plate 7 form a relatively closed area. There are four sets of partition 3. One set of partition 3 is provided on both sides of each set of connecting terminals 2. Only one set of partition 3 is required between two sets of adjacent connecting terminals 2. That is to say, the injection molded body 1 and two adjacent partition 3 form a semi-closed area 4 with three sides surrounding one side and an opening. The solder part 21 is located in this semi-closed area. When the connector works in a high humidity environment, because the partition 3 is added between the connecting terminals 2, the partition 3 prevents the exposed copper material from migrating and causing electrochemical corrosion.

[0023] Furthermore, the connecting terminal 2 includes a soldering part 21 and a plug-in part 22. The plug-in part 22 is used to plug into the PCBA board (not shown in the figure), so the plug-in part 22 is a cylindrical structure. The soldering part 21 is used to solder to the pads 71 ​​on the heating plate 7, so the soldering part 21 is a flat elongated structure. The soldering part 21 includes a connecting part 211 and a soldering end 212. The connecting part 211 is provided with a circular connecting hole. Through the connecting hole, the connecting part 211 can be connected to the plug-in part 22. The soldering end 212 of the soldering part 21 is the part exposed outside the injection molded body 1. The soldering end 212 is used to solder to the pads 71 ​​on the heating plate 7.

[0024] Furthermore, the partition 3 has a cuboid structure and is integrally molded with the injection-molded body 1. The lower surface of the partition 3 is flush with the lower surface of the welding end 212. This ensures that after the welding end 212 is welded to the pad 71 of the heating plate 7, the lower surface of the partition 3 remains firmly attached to the heating plate 7, preventing gaps between them. This also allows the partition 3 to form a relatively enclosed space at the pad 71 of the heating plate 7, ensuring effective separation between adjacent connecting terminals 2 (welding parts 21). Alternatively, the partition 3 and the injection-molded body 1 can be a non-integral structure, with the partition 3 added after the injection-molded body 1 is formed. In this embodiment, for ease of manufacturing, the partition 3 and the injection-molded body 1 are designed as an integral injection-molded unit.

[0025] Furthermore, the end of the partition 3 away from the injection molded body 1 is aligned with the position of the welding end 212, that is, the end of the partition 3 away from the injection molded body 1 is aligned with the end of the welding part 21 away from the injection molded body 1. This ensures that the welding end 212 is located within the semi-enclosed area 4 formed by the partition 3 and the injection molded body 1, preventing the welding end 212 from protruding outside the semi-enclosed area 4 and ensuring the blocking effect of the partition 3.

[0026] Furthermore, the welding part 21 has a bent structure. The connecting part 211 of the welding part 21 is positioned higher than the welding end 212 of the welding part 21. The connecting part 211 and the welding end 212 are bent into a Z-shape (the connecting part 211 and the welding end 212 form an obtuse angle Z-shape with the bent part). Since the connecting part 211 is completely located inside the injection molded body 1, only the welding end 212 is exposed outside the injection molded body 1. This effectively reduces the contact area between the welding part 21 and the welding pad 71 of the heating plate 7, thereby reducing the possibility of gaps between the welding part 21 and the heating plate 7 and avoiding the generation of cold solder joints. The end of the welding end 212 has a U-shaped opening structure.

[0027] A bubble-point structure 5 is provided on the upper surface of the welding end 212. The bubble-point structure 5 on the welding end 212 is formed by stamping and can form a welding boss 51 structure on the lower surface of the welding end 212. The welding boss 51 can further reduce the contact area between the welding end 212 and the pad 71 of the heating plate 7, while ensuring sufficient contact between the welding end 212 and the pad 71 to achieve good positioning. The gap at the welding point is also controlled, improving the welding quality and avoiding the generation of cold solder joints. In addition, the bubble-point structure 5 can also help to better position the welding end 212 and the pad 71 of the heating plate 7.

[0028] Furthermore, the injection molded body 1 comprises two parts: one part covers the relatively horizontal welding portion 21 and is arranged horizontally overall, and the other part covers the vertically arranged plug portion 22 and is arranged vertically overall. The horizontally arranged injection molded body 1 covers the connection portion of the welding portion 21 and the plug portion 22, and also forms a mounting base 11, which can be used to mount the entire connector on the heating plate 7. The lower surface of the mounting base 11 is flush with the lower surface of the partition portion 3 and also flush with the lower surface of the welding end 212. The bent portion between the connection portion 211 and the welding end 212 of the welding portion 21 is also covered by the injection molded body 1, so that defects on the bent portion of the welding portion 21 can also be covered by the injection molded body 1, thereby improving the insulation effect of the surface of the welding portion 21.

[0029] In this embodiment, the partition part 3 and the injection molded body 1 covering the bent portion of the welding part 21 are also arranged at intervals. This not only reduces the width dimension of the partition part 3, but also increases the space of the semi-enclosed area, making the welding operation between the welding part 21 and the welding pad 71 of the heating plate 7 easier to complete.

[0030] Mounting holes 12 are also provided on the mounting base 11 of the injection molded body 1. There are two sets of mounting holes 12, which are distributed on both sides of the connecting terminal 2. The connector can be stably fixed on the heating plate 7 through the mounting holes 12.

[0031] Example 2: As Figure 4 and Figure 5 The connector shown is for a heating plate. In this embodiment, the connector from Embodiment 1 is arranged on the heating plate 7. A U-shaped mounting opening 72 is provided on the heating plate 7, allowing the connector to be fixedly arranged on the heating plate 7. Specifically, the vertical portion of the injection molded body 1 is embedded in the U-shaped mounting opening 72, and the horizontal mounting seat 11 on the injection molded body 1 is arranged on the upper surface of the heating plate 7. At the same time, the lower surface of the welding end 212 of the welding part 21 is also close to the upper surface of the heating plate 7, and then the welding end 212 and the heating plate 7 are fixedly connected by welding. The vertical insertion part 22 of the connector is inserted into the PCBA board, enabling the PCBA board and the heating plate 7 to conduct electricity.

[0032] The heating plate 7 has connecting holes (not shown in the figure) corresponding to the mounting holes 12 on the injection molded body 1. The mounting holes 12 on the injection molded body 1 and the connecting holes on the heating plate 7 are fixedly connected by screws and other connecting components. The position on the heating plate 7 corresponding to the welding end 212 is a solder pad 71, which is part of the circuit structure. When the welding end 212 abuts against the solder pad 71, the welding boss 51 on the lower surface of the welding end 212 contacts the solder pad 71 on the heating plate 7. The welding boss 51 not only better positions the welding part 21 and the solder pad 71 but also improves the welding quality. The welding boss 51 at the bottom of the welding part 21 and the solder pad 71 are welded using reflow soldering or spot welding.

[0033] After the soldering end 212 is soldered to the solder pad 71, it is necessary to apply conformal coating to the area where the solder pad 71 is located (semi-enclosed area 4). Understandably, after adding sufficient conformal coating, the coating will remain in the semi-enclosed area 4 formed by the partition part 3 and the injection molded body 1, so that the conformal coating will not flow between the connecting terminals 2, but will cover the solder joint and the exposed metal part of the soldering part 21 as much as possible in the semi-enclosed space. In this way, in a high humidity environment, it can prevent the exposed copper material from migrating and causing electrochemical corrosion.

[0034] If there is no partition 3 to block the solder joints 21 of the connecting terminals 2, the conformal coating located at the solder pad 71 will flow between the solder joints 21 of the connecting terminals 2, failing to ensure proper coverage of the solder joints and metal terminals. In high humidity environments, water, acting as a carrier, will cause the copper material to migrate under the influence of the potential difference between the solder pads 71, resulting in electrochemical corrosion and causing the insulation of the heating component to fail.

[0035] Example 3: This example combines Figures 1 to 5 The manufacturing process of this utility model will be described.

[0036] 1. Stamping and electroplating; First, the welding part 21 in the connecting terminal 3 is stamped and bent into a Z-shaped structure, and the connecting part 211 and the welding end 212 of the welding part 21 are both stamped into a preliminary flat shape. Then, the circular connecting hole on the connecting part 211 and the top of the plug-in part 22 are fixedly connected to form an L-shaped connecting terminal 2. Then, the surface of the connecting terminal 2 is electroplated.

[0037] Typically, the substrate for the connecting terminal 2 is made of copper strip with good conductivity, such as C19010 or C70250. After stamping, the surface of the connecting terminal 2 is electroplated for corrosion resistance. This process involves applying nickel as a base coat before tin plating.

[0038] 2. Injection Molding: The pre-formed and electroplated connector 2 is placed into the mold for injection molding, forming an injection body 1 around the connector 2. The exposed bottom portion of the connector 2's insertion part 22 is used for inserting into the PCBA board, and the exposed portion of the connector 2's welding part 21 serves as the welding end 212. During the injection molding process, partition parts 3 are integrally formed on the injection body 1, with the partition parts 3 located on both sides of the welding part 21. The partition parts 3 on both sides of the welding part 21 and the injection body 1 together form a semi-enclosed area 4 with three sides closed and one side open, surrounding the welding part 21.

[0039] During the injection molding process, the connecting terminals are also positioned, with the soldering end of the connecting terminal aligned with the solder pad of the heating plate, and the insertion part of the connecting terminal aligned with the PCBA board. The soldering part of the injection molded body on the connecting terminal forms a mounting base, and the lower surface of the mounting base is approximately flush with the lower surface of the soldering end.

[0040] 3. Shaping the connecting terminal 2: After bending and injection molding, the welding part 21 of the connecting terminal 2 is further shaped using a mold to flatten the welding surface of the welding end 212, making the lower surface of the welding end 212, the lower surface of the mounting base 11 of the injection molded body 1, and the lower surface of the partition part 3 evenly aligned. Then, a bubble point structure 5 is stamped on the upper surface of the welding end 212, and a welding boss 51 is formed on the lower surface of the welding end 212.

[0041] 4. Connector Installation: Insert the vertically arranged injection-molded body 1 of the connector into the U-shaped mounting opening 72 on the heating plate 7. Then, align the soldering part 21 of the connecting terminal 2 with the solder pad 71 of the heating plate 7, and align the insertion part 22 with the PCBA board. Solder the bottom soldering surface of the soldering part 21 of the connecting terminal 2 to the solder pad 71 of the heating plate 7 using reflow soldering or spot soldering. Then, insert the bottom of the insertion part 22 of the connecting terminal 2 into the interface on the PCBA board, so that in the application of the heater, the heating plate 7, the connector, and the PCBA board are connected. Finally, apply conformal coating to the solder pad 71 for protection.

Claims

1. A connector for a heating plate, comprising an injection-molded body and a connecting terminal, wherein the middle portion of the connecting terminal is located within the injection-molded body, and the connecting terminal includes a solder portion, characterized in that, A partition portion is provided on the injection molded body and on both sides of the welded portion. The injection molded body and the two adjacent partition portions form a semi-enclosed area, and the welded portion is located within the semi-enclosed area.

2. The connector for a heating plate according to claim 1, characterized in that, The end of the partition portion away from the injection molded body corresponds to the end of the weld portion away from the injection molded body.

3. The connector for a heating plate according to claim 1, characterized in that, The welded part has a bent structure. The welded part includes a connecting part located inside the injection molded body and a welded end exposed outside the injection molded body. The connecting part is located higher than the welded end, and the lower surface of the welded end is flush with the lower surface of the partition part.

4. The connector for a heating plate according to claim 3, characterized in that, The welding end is provided with a bubble point structure and a welding boss is formed on the lower surface of the welding end.

5. A connector for a heating plate according to claim 3, characterized in that, The connection terminal also includes a plug-in portion, the end of which near the injection molded body is covered by the injection molded body and connected to the connection portion, and the end of which away from the injection molded body is exposed outside the injection molded body.

6. A connector for a heating plate according to any one of claims 1 to 5, characterized in that, The connection terminals are provided in a plurality of form, and a set of partitions are provided between the connection terminals.

7. A connector for a heating plate according to any one of claims 1 to 5, characterized in that, The injection-molded body is provided with mounting holes.

8. A connector for a heating plate according to any one of claims 1 to 5, characterized in that, The partition is made of insulating material, and the partition and the injection molded body are an integral structure.

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