New energy automobile high-power terminal reed

Abstract

The large-power terminal reed of the new energy automobile is used for connection between a male terminal and a female terminal and comprises an upper surrounding edge, a contact elastic piece and a lower surrounding edge, the upper surrounding edge and the lower surrounding edge are of an annular structure, protruding edges are arranged on the outer circle face of the upper surrounding edge and the outer circle face of the lower surrounding edge, the top of the contact elastic piece is connected with the upper surrounding edge, and the top of the contact elastic piece is connected with the lower surrounding edge. The bottom of the contact elastic piece is connected with the lower surrounding edge. According to the utility model, the plurality of ribs are arranged on the upper surrounding edge and the lower surrounding edge, the contact between the reed and the terminal base body is converted from point contact to line-surface contact by using the ribs, and the contact resistance is much smaller than the resistance of point-surface contact, so that the lower contact resistance is realized, the overhigh temperature caused by contact is avoided, and the problem of temperature rise is solved; meanwhile, the contact spring sheet of the utility model is arranged in a spiral shape, and the circumference of the contact spring sheet is recessed to form a bottleneck-shaped structure, when the male terminal is inserted into the spring sheets, each spring sheet is stressed to deform outwards, and positive pressure is generated on the contact points of the spring sheets and the male terminal, thereby ensuring the stability and reliability of electrical connection.

Description

Technical Field

[0001] This utility model relates to the field of electrical connector technology, and more specifically, to a high-power terminal spring for new energy vehicles. Background Technology

[0002] Existing connection terminals typically include male and female terminals. To achieve the connection between the male and female terminals, a spring is provided inside the female terminal. Then, the male terminal is inserted into the spring. In this way, the spring enables the connection between the male and female terminals and the conduction of current between the male and female terminals.

[0003] Standard DC charging sockets have two high-power terminals: DC+ and DC-. Currently, these terminals are mainly available in two structures: spring-loaded and slotted. The slotted structure is more expensive than the spring-loaded structure due to its longer manufacturing time, and is only used by some automakers. The spring-loaded structure is widely used because of its stable performance, longer insertion and removal life, and ability to enable automated assembly. However, the spring-loaded structure also has significant drawbacks. The insertion and removal force during the terminal insertion and removal process mainly comes from the spring, especially under oblique insertion conditions. The spring often undergoes significant deformation, resulting in maximum stress exceeding the material's yield strength, leading to loss of insertion and removal force, increased contact resistance, and ultimately, excessive temperature rise.

[0004] To improve the yield strength of the spring, beryllium copper is required and it needs to be heat-treated to meet the requirements. However, beryllium copper has a conductivity of only about 20%, which leads to problems such as high contact resistance and high temperature rise, making it unsuitable for high-power terminals.

[0005] Therefore, it is necessary to propose a high-power terminal spring for new energy vehicles to solve the problem that beryllium copper has low conductivity and is not suitable for high-power terminals. Utility Model Content

[0006] This utility model provides a high-power terminal spring for new energy vehicles to solve the problems of high contact resistance and low conductivity of existing high-power terminals, which are not suitable for high-power terminals.

[0007] According to one aspect of the present invention, a high-power terminal spring for new energy vehicles is provided for connection between male and female terminals. It includes an upper rim, a contact spring, and a lower rim. The upper rim and the lower rim are in an annular structure and have a protruding ridge on their outer circular surface. The top of the contact spring is connected to the upper rim, the bottom of the contact spring is connected to the lower rim, and the contact spring is arranged in a spiral shape.

[0008] Based on the above scheme, the contact spring is preferably recessed axially towards the spring, and the points at the foremost ends of the recess of each contact spring are connected to form an annular body, the diameter of which is the minimum inner diameter of the spring.

[0009] Based on the above scheme, the minimum inner diameter of the spring is 0.5 to 1 mm smaller than the diameter of the mating male terminal.

[0010] Based on the above scheme, the preferred embodiment is that there are 39 contact springs and 39 protruding ridges.

[0011] Based on the above scheme, the upper edge, contact spring, and lower edge are preferably made of copper alloy.

[0012] This utility model discloses a high-power terminal spring for new energy vehicles. Multiple protruding ridges are provided on the upper and lower edges. These ridges transform the contact between the spring and the terminal substrate from point contact to line-surface contact. This contact resistance is much lower than that of point-surface contact, thus achieving lower contact resistance and solving the temperature rise problem. Simultaneously, the contact spring of this utility model is spirally arranged, with its circumferential concave shape forming a bottleneck structure. When the male terminal is inserted into the spring, each spring deforms outward under force, generating positive pressure at the contact point between the spring and the male terminal, thereby ensuring a stable and reliable electrical connection. Attached Figure Description

[0013] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0014] Figure 1 This is a schematic diagram of the structure of the high-power terminal spring for new energy vehicles according to this utility model.

[0015] Figure 2 This is a bottom view of the high-power terminal spring for new energy vehicles according to this utility model;

[0016] Figure 3 This is a longitudinal sectional view of the contact between the high-power terminal spring and the pin in a new energy vehicle according to this utility model.

[0017] Figure 4 This is a longitudinal sectional view of the high-power terminal spring and end base of the new energy vehicle according to this utility model after assembly.

[0018] Figure 5 This is a cross-sectional view of the high-power terminal spring and terminal base of the new energy vehicle according to this utility model after assembly.

[0019] Explanation of icon numbers:

[0020] 1. Upper edge; 2. Contact spring; 3. Lower edge; 4. Raised ridge; 6. Male terminal; 7. Female terminal; 8. Front contact area; 9. Middle locking area; 10. Rear contact area. Detailed Implementation

[0021] The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0022] It should be understood that, when used in this specification and the appended claims, the term "comprising" indicates the presence of a descriptive feature, integral, step, operation, element, and / or component, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or sets.

[0023] To keep the drawings concise, only the parts relevant to this invention are shown schematically in each figure, and they do not represent the actual structure of the product. Furthermore, for ease of understanding, in some figures, only one of the components with the same structure or function is schematically depicted, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one."

[0024] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0025] In the embodiments shown in the accompanying drawings, the directional indications (such as up, down, left, right, front, and back) used to explain the structure and movement of the various components of this invention are relative rather than absolute. These descriptions are appropriate when these components are in the positions shown in the drawings. If the descriptions of the positions of these components change, these directional indications also change accordingly.

[0026] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the specific implementation methods of this utility model will be described below with reference to the accompanying drawings. Obviously, the drawings described below are merely some embodiments of this utility model. For those skilled in the art, other drawings and other implementation methods can be obtained based on these drawings without any creative effort.

[0028] Please see Figure 1 and combined Figure 2 andFigure 3 As shown, this utility model provides a high-power terminal spring for new energy vehicles, used for connecting male terminal 6 and female terminal 7. The high-power terminal spring for new energy vehicles includes an upper edge 1, a contact spring 2, and a lower edge 3. The upper edge 1 is connected to the lower edge 3 through the contact spring 2.

[0029] The upper edge 1 and the lower edge 3 are both designed as ring structures, and multiple protruding ribs 4 are spaced apart on the outer circular surface of the upper edge 1 and the lower edge 3. The protruding ribs 4 are arranged along the width direction of the upper edge 1 and the lower edge 3, and penetrate through the upper end face and the lower end face of the upper edge 1 and the lower edge 3 to form a strip structure. The head of the contact spring 2 is connected between the protruding ribs 4 of the upper edge 1, and the bottom of the contact spring 2 is connected between the protruding ribs 4 of the lower edge 3. The contact spring 2 is arranged in a spiral shape.

[0030] Specifically, the spring of this utility model includes an upper circumference 1, a lower circumference 3, and 39 contact springs 2, wherein the upper circumference 1, the lower circumference 3, and the contact springs 2 are a single unit. The upper circumference 1 and the lower circumference 3 are each provided with 39 protruding ridges 4, which penetrate both end faces of the upper circumference 1 and the lower circumference 3, forming a strip-shaped structure. The strip-shaped protruding ridges 4 are located in the gap area between every two contact springs. Each contact spring 2 is connected to the upper and lower circumferences 3 to form a single unit. Each contact spring 2 is arranged in an inclined spiral on the upper and lower circumferences 3 and is recessed axially towards the spring. The point connecting the frontmost end of the recess of each contact spring 2 forms an annular body, the diameter of which is the minimum inner diameter of the spring, i.e., the throat diameter of the spring. The throat diameter is generally designed to be 0.5~1mm smaller than the diameter of the mating male terminal 6.

[0031] In use, the springs of this application are installed in the female terminal 7. When the male terminal 6 is inserted into the springs, each spring is deformed outward under force, generating positive pressure at the contact point between the springs and the male terminal 6, thereby ensuring a stable and reliable electrical connection.

[0032] For ease of installation, preferably, openings 11 are provided on the upper and lower edges 1 and 3 of this invention to increase its elastic retractability; preferably, a groove is provided inside the female terminal 7 of this invention, and a spring is installed in the groove. When the male terminal 6 is inserted into the female terminal 7, a front contact area 8 is formed where the female terminal 7 contacts the upper edge 1, a middle engagement area 9 where the male terminal 6 contacts the throat diameter, and a rear contact area 10 where the female terminal 7 contacts the lower edge 3. The specific structure is as follows. Figure 4 , Figure 5 As shown.

[0033] The spring is made by stamping strip into a ring. After forming, it does not require heat treatment and can be directly electroplated to become a finished product. When used on high-power terminals, it is generally silver-plated. Silver plating can greatly reduce the contact resistance of the spring.

[0034] After electroplating, the spring is installed into the terminal, with each protruding ridge 4 on the upper and lower edges 1 and 3 of the spring contacting the inner wall of the terminal. Traditional springs do not have these protruding ridges 4 on the upper and lower edges 1 and 3; theoretically, the contact is between the outer surfaces of the upper and lower edges 3 and the inner surface of the terminal substrate. However, in reality, it is not a surface-to-surface contact, but a point contact. This is because when a traditional spring is twisted, the connection between the spring and the upper and lower edges 3 bulges due to the twisting, and this bulging point is actually the point of contact between the spring and the inner wall of the terminal. In contrast, the structure of this invention has many protruding ridges 4 evenly distributed on the upper and lower edges 1 and 3 of the spring. These ridges 4 protrude from the outer surfaces of the upper and lower edges. Therefore, the contact between the spring and the terminal substrate is actually between the outer surfaces of the protruding ridges 4 and the inner surfaces of the terminal substrate—a line-to-surface contact. This type of contact has a much lower contact resistance than a point-to-surface contact, thus achieving a lower contact resistance.

[0035] The spring and terminal are assembled deeper in this structure than in traditional springs, typically to a position less than 5mm from the terminal opening. This installation reduces the maximum insertion angle of the male terminal 6 into the spring, thus preventing excessive deformation of the spring during oblique insertion, which could lead to yielding deformation and loss of insertion and extraction force.

[0036] Among them, the upper edge 1, the contact spring 2 and the lower edge 3 are made of copper alloy. By utilizing the high conductivity of the copper alloy and combining it with the design of the protruding ridge 4, the volume resistance of the spring and the contact resistance between the spring and the terminal substrate are reduced, the temperature rise is reduced, and it can be used in high-power charging terminals.

[0037] Compared to existing reeds, reeds with this structure can be stamped without the need for additional torsion and heat treatment processes. The length of the reed can be designed to be shorter, thereby reducing manufacturing, material, and electroplating costs.

[0038] This utility model discloses a high-power terminal spring for new energy vehicles. Multiple protruding ridges 4 are provided on the upper and lower edges 1 and 3. These ridges 4 transform the contact between the spring and the terminal substrate from point contact to line-surface contact. This contact resistance is much lower than that of point-surface contact, thus achieving lower contact resistance and solving the temperature rise problem. Simultaneously, the contact spring 2 of this utility model is spirally arranged and circumferentially concave to form a bottleneck-like structure. When the male terminal 6 is inserted into the spring, each spring is deformed outwards under force, generating positive pressure at the contact point between the spring and the male terminal 6, thereby ensuring a stable and reliable electrical connection.

[0039] Finally, the method described in this application is merely a preferred embodiment and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A new energy vehicle high-power terminal spring leaf for connecting between a male terminal and a female terminal, characterized in that, The contact spring comprises an upper edge, contact springs and a lower edge, the upper edge and the lower edge are annular structures, and convex edges are arranged on the outer circumferential surfaces of the upper edge and the lower edge, the top of the contact spring is connected with the upper edge, the bottom of the contact spring is connected with the lower edge, and the contact spring is arranged in a spiral shape.

2. The high-power terminal spring of a new energy vehicle according to claim 1, characterized in that, The contact spring is axially recessed to the reed, and the points connecting the most front ends of the recesses of each contact spring form a ring body, the diameter of the ring body is the minimum inner diameter of the reed.

3. The high-power terminal spring of a new energy vehicle according to claim 2, characterized in that, The minimum inner diameter of the reed is 0.5-1mm smaller than the diameter of the mating male terminal.

4. The high-power terminal spring of a new energy vehicle according to claim 1, characterized in that, The contact spring is 39, and the convex edges are 39.

5. The high-power terminal spring of a new energy vehicle according to claim 1, characterized in that, The upper edge, the contact spring and the lower edge are copper alloy bodies.

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