Novel pre-charging resistor and pre-charging module

Abstract

The utility model relates to a novel pre-charging resistor and a pre-charging module, the novel pre-charging resistor comprises a fixed body, a conductive terminal and a metal shell, the fixed body is fixedly provided with the conductive terminal, the conductive terminal is provided with an insertion part, the insertion part is used for being inserted into a differential connection hole of a circuit board, the metal shell wraps the fixed body, and the metal shell covers the fixed body. And the metal shell is provided with an elastic sheet for fixing. According to the novel pre-charging resistor provided by the embodiment of the invention, the conductive terminal is arranged on the fixed body, the conductive terminal is provided with the insertion part, the insertion part can be directly inserted into the insertion hole of the circuit board to be electrically connected with the circuit board, and wiring harness connection does not need to be arranged between the conductive terminal and the circuit board; according to the BDU zero wiring harness, the problems that the risk of failure of a pre-charging loop is increased, the size is large and the risk of explosion and fire are easily caused by wiring harness connection in the prior art are solved, the BDU zero wiring harness is realized, and the simple installation and fixation of the product are realized by arranging the fixing elastic sheet on the metal shell.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicles, and specifically to a novel pre-charging resistor and a pre-charging module. Background Art

[0002] Currently in the field of new energy vehicles, electric vehicles are pre-charged in the pre-charging circuit before charging. In the pre-charging circuit, the pre-charging resistor will slowly charge the high-voltage circuit large-capacity capacitor at the beginning of the vehicle's high-voltage power-on. If there is no pre-charging resistor, the high voltage will be directly added to the high-voltage circuit large-capacity capacitor, resulting in a very large instantaneous current when the capacitor is powered on, which can easily cause the high-voltage relay to stick and affect the high-voltage power-on. The pre-charging resistor ensures the safety of the high-voltage circuit in the pre-charging circuit.

[0003] In the related art, the traditional pre-charge resistor is mainly composed of an electrical connection sheet, a resistance wire, a heat dissipation ceramic body, and a cement shell. The electrical connection between the electrical connection sheet and the circuit board is mainly based on a wiring harness connection. The connection between the wiring harness and the electrical connection sheet has an electrical connection point, and the connection between the wiring harness and the circuit board also has an electrical connection point, resulting in a large number of connection points when the pre-charge resistor and the circuit board are electrically connected. If any electrical connection point is disconnected, the pre-charge circuit will fail, increasing the risk of pre-charge circuit failure. In addition, the use of a wiring harness connection makes the module formed after the pre-charge resistor and the circuit board are connected larger in size. In addition, the pre-charge resistor uses a cement shell. In the case of failure of the pre-charge short-circuit protection of the electric vehicle, the vehicle body is prone to explosion and fire.

[0004] Therefore, it is necessary to design a new pre-charge resistor to overcome the above problems. Utility Model Content

[0005] The present application provides a novel pre-charging resistor and a pre-charging module, which can solve the technical problems in the related art that the use of wiring harness connection increases the risk of pre-charging circuit failure, is large in size, and is prone to the risk of explosion and fire.

[0006] In a first aspect, an embodiment of the present application provides a novel pre-charging resistor, which includes:

[0007] A fixed body, wherein a conductive terminal is fixed to the fixed body, wherein the conductive terminal has a plug-in portion, and the plug-in portion is used to be inserted into a plug-in hole of a circuit board;

[0008] A metal shell is wrapped outside the fixing body and is provided with a fixing spring.

[0009] Among them, the conductive terminal is inserted into the plug-in hole of the circuit board through the plug-in part to realize electrical connection with the circuit board, and the fixing spring clip cooperates with the fixed shell to realize the fixation of the new pre-charging resistor. There is no need to set a wiring harness connection between the conductive terminal and the circuit board, which reduces the connection points of the electrical connection between the new pre-charging resistor and the circuit board, reduces the risk of failure of the pre-charging circuit, and reduces the volume of the entire module. The metal shell has high strength. When the pre-charging short-circuit protection fails on the electric vehicle, the risk of explosion and fire can be reduced. In addition, the fixing spring clip realizes simple installation and fixation of the product.

[0010] In combination with the first aspect, in one embodiment, the conductive terminal further comprises a main body, the main body is fixed to the fixed body, the main body is connected to the plug-in portion, and a height limiting boss is formed at the connection between the main body and the plug-in portion, wherein the main body is inserted into the fixed body as a whole. In this embodiment, the height limiting boss can limit the insertion height of the circuit board, making it simple and convenient to connect the novel pre-charging resistor to the circuit board.

[0011] In combination with the first aspect, in one embodiment, the plug-in portion has a welding surface, and the welding surface is used to weld with the circuit board. When the plug-in portion is inserted into the plug-in hole of the circuit board, the welding surface can be welded with the inner wall surface of the plug-in hole, thereby realizing the electrical connection between the conductive terminal and the circuit board. In this embodiment, by providing a welding surface on the plug-in portion, the plug-in portion and the circuit board can be welded and connected, making the connection between the circuit board and the plug-in portion more secure, and at the same time, electrical conduction can be realized.

[0012] In combination with the first aspect, in one embodiment, the fixing spring sheet is stamped from the metal shell, and the fixing spring sheet extends obliquely from the connection with the metal shell toward the direction close to the plug-in portion and away from the fixed body. In this embodiment, the fixing spring sheet and the metal shell share the same metal sheet, and the fixing spring sheet is stamped from the metal sheet instead of being fixed to the metal shell separately, so that the material can be fully utilized, and the fixing spring sheet can be formed on the metal shell at the same time as the metal shell is formed, and the fixing spring sheet in this embodiment extends obliquely upward.

[0013] In combination with the first aspect, in one embodiment, the plug-in portion is provided with a small hole, and the small hole is used for the plug-in portion to interlock with the circuit board, wherein a protrusion is provided on the circuit board, and when the plug-in portion is inserted into the plug-in hole of the circuit board, the protrusion can protrude into the small hole and cooperate with the small hole. The small hole is provided on the plug-in portion so that the new pre-charging resistor can be directly inserted and connected with the circuit board, which can prevent the conductive terminal from falling out of the plug-in hole while achieving electrical conduction between the conductive terminal and the circuit board.

[0014] In combination with the first aspect, in one embodiment, an insulating sheet is provided between the fixed body and the metal shell, wherein the insulating sheet effectively isolates the fixed body and the metal shell, thereby improving the insulation risk of the fixed body and the metal shell under high humidity conditions.

[0015] In the second aspect, an embodiment of the present application provides a pre-charging module including the above-mentioned new pre-charging resistor, a circuit board and a fixed shell, the circuit board is provided with a plug hole, and the plug hole is plugged into and matched with the conductive terminal of the new pre-charging resistor; the fixed shell is fixed to the fixing spring clip of the new pre-charging resistor, and the new pre-charging resistor is fixed by the fixed shell and the fixing spring clip.

[0016] In combination with the second aspect, in one embodiment, the fixed shell is provided with a cavity and a locking groove that are interconnected, the locking groove penetrates the fixed shell in a direction away from the circuit board, and the cavity penetrates the fixed shell in a direction close to the circuit board; the new type of pre-charging resistor is installed in the cavity, and the fixing spring is inserted into the locking groove, and the locking groove effectively prevents the new type of pre-charging resistor from escaping from the shell. The cavity and the locking groove that are interconnected are provided in the fixed shell to form a step at the connection, and the fixing spring can be pressed against the step to fix the new type of pre-charging resistor in the fixed shell.

[0017] In combination with the second aspect, in one embodiment, a shock-absorbing buffer pad is sandwiched between the bottom surface of the metal shell and the fixed shell. By providing the shock-absorbing buffer pad, the shaking frequency of the new pre-charging resistor during fixation or use can be effectively reduced.

[0018] In combination with the second aspect, in one embodiment, the metal shell includes a frame and two metal plates, the frame is wrapped around the bottom surface and two opposite side surfaces of the fixed body; the two metal plates are fixed to the frame and distributed on the other two opposite side surfaces of the fixed body, and each of the metal plates is provided with a fixing spring. The frame and the metal plates are fixed by welding. In this embodiment, the metal shell is divided into a frame and two metal plates, which not only makes the metal shell easy to form, but also facilitates the assembly of the metal shell and the fixed body. Since the metal shell and the fixing spring are made of metal materials that are easy to stamp and form, the dimensional tolerance of the new pre-charging resistor is more convenient to control, which is very conducive to automated assembly.

[0019] The beneficial effects brought by the technical solution provided in the embodiments of the present application include:

[0020] By arranging a conductive terminal on the fixed body, and the conductive terminal has a plug-in part, the plug-in part can be directly inserted into the plug-in hole of the circuit board to realize electrical connection with the circuit board. There is no need to set a wiring harness connection between the conductive terminal and the circuit board, and the metal shell wrapped outside the fixed body has high strength. In the event that the pre-charge short-circuit protection on the electric vehicle fails, the risk of explosion and fire can be reduced. By arranging a fixing spring clip on the metal shell, the product can be easily installed and fixed, which solves the problem in the related technology that the use of wiring harness connection increases the risk of failure of the pre-charge circuit, the large volume, and the risk of explosion and fire, and realizes the zero wiring harness of BDU (high-voltage distribution box). BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A schematic diagram of the structure of a novel pre-charging resistor provided in an embodiment of the present application;

[0023] Figure 2 A schematic diagram of the structure of another novel pre-charging resistor provided in an embodiment of the present application;

[0024] Figure 3 A schematic diagram of the structure of a pre-charging module provided in an embodiment of the present application.

[0025] In the figure: 1. fixed body; 2. conductive terminal; 21. plug-in part; 22. main body; 23. height limiting boss; 24. small hole; 3. metal shell; 4. fixing spring; 5. insulating sheet; 6. circuit board; 61. plug-in hole; 7. fixed shell; 71. cavity; 72. locking groove; 8. shock-absorbing buffer pad. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] The embodiments of the present application provide a novel pre-charging resistor and pre-charging module, which can solve the technical problems in the related art that the use of wiring harness connection increases the risk of pre-charging circuit failure, is large in size, and is prone to the risk of explosion and fire.

[0028] See also Figure 1 and Figure 3 As shown, the embodiment of the present application provides a new type of pre-charging resistor, which may include a fixed body 1, a conductive terminal 2 and a metal shell 3. Specifically, in combination with Figure 1 As shown, the fixed body 1 is fixed with a conductive terminal 2, and the conductive terminal 2 has a plug-in portion 21, which protrudes from the surface of the fixed body 1, and the plug-in portion 21 is used to be inserted into the plug-in hole 61 of the circuit board 6, that is, the circuit board 6 is provided with a plug-in hole 61 that cooperates with the conductive terminal 2, and the conductive terminal 2 can be inserted into the plug-in hole 61 of the circuit board 6 through the plug-in portion 21 to achieve electrical connection with the circuit board 6; the metal shell 3 is wrapped around the outside of the fixed body 1, and the metal shell 3 is provided with a fixing spring 4, wherein the fixing spring 4 can be used to cooperate with the fixed shell, so as to fix the new pre-charging resistor of this embodiment.

[0029] In this embodiment, by setting a conductive terminal 2 on the fixed body 1, and the conductive terminal 2 has a plug-in portion 21, the plug-in portion 21 can be directly inserted into the plug-in hole 61 of the circuit board 6 to achieve electrical connection with the circuit board 6, and there is no need to set a wiring harness connection between the conductive terminal 2 and the circuit board 6, which reduces the connection points of the electrical connection between the new pre-charge resistor and the circuit board 6, and reduces the risk of failure of the pre-charge circuit. At the same time, there is no need to add a wiring harness to achieve the connection between the conductive terminal 2 and the circuit board 6, which can reduce the volume of the entire module. In addition, the metal shell 3 wrapped outside the fixed body 1 has high strength, and in the case of failure of the pre-charge short-circuit protection on the electric vehicle, the risk of explosion and fire can be reduced. By setting a fixing spring 4 on the metal shell 3, the product can be easily installed and fixed, which solves the problem that the use of wiring harness connection in the related art increases the risk of failure of the pre-charge circuit, is large in size, and is prone to explosion and fire, and realizes zero wiring harness of BDU.

[0030] Optionally, the fixed body 1 is made of cement or other materials, and the shell outside the fixed body 1 is made of metal material with higher strength. In the event of failure of the pre-charging circuit of the electric vehicle, the risk of explosion and fire can be reduced.

[0031] Further, see Figure 1 As shown, in some embodiments, the conductive terminal 2 may further include a main body 22, the main body 22 is fixed to the fixed body 1, the main body 22 is connected to the plug-in portion 21, and a height limiting boss 23 is formed at the connection between the main body 22 and the plug-in portion 21, wherein the main body 22 is inserted into the fixed body 1 as a whole, and the main body 22 may be partially exposed outside the fixed body 1. Optionally, the main body 22 and the plug-in portion 21 may be directly connected or connected in other indirect ways. The main body 22 is preferably configured to be a flat plate, and the plug-in portion 21 may also be configured to be a flat plate. The board width of the plug-in portion 21 may be smaller than the board width relative to the main body 22, so that a height limiting boss 23 is formed at the connection between the plug-in portion 21 and the main body 22. The height limiting boss 23 can limit the insertion height of the circuit board 6, making the connection between the new pre-charging resistor and the circuit board 6 simple and convenient.

[0032] Further, see Figure 1 and Figure 3As shown, in some embodiments, the plug-in portion 21 has a welding surface, and the welding surface is used for welding with the circuit board 6. When the plug-in portion 21 is inserted into the plug-in hole 61 of the circuit board 6, the welding surface can be welded to the inner wall surface of the plug-in hole 61, so as to realize the electrical connection between the conductive terminal 2 and the circuit board 6. The welding surface can be set on the plate surface or the side surface of the plug-in portion 21. One welding surface, two welding surfaces, or four welding surfaces can be set on the plug-in portion 21. The welding surface and the inner wall surface of the plug-in hole 61 can be parallel or relatively inclined, and the welding surface can contact with the inner wall surface of the plug-in hole 61 and be further welded and connected on the contact. The welding surface can also have a gap between the inner wall surface of the plug-in hole 61, and solder can be filled in the gap to realize electrical connection. In this embodiment, by setting a welding surface on the plug-in portion 21, the plug-in portion 21 can be welded and connected to the circuit board 6, so that the circuit board 6 and the plug-in portion 21 are more firmly plugged, and electrical conduction can also be realized.

[0033] Further, see Figure 1 As shown, in some embodiments, the fixing spring piece 4 is stamped from the metal shell 3, and the fixing spring piece 4 extends obliquely from the connection with the metal shell 3 toward the direction close to the plug-in portion 21 and away from the fixed body 1. In this embodiment, the fixing spring piece 4 and the metal shell 3 share the same metal plate material, and the fixing spring piece 4 is stamped from the metal plate material instead of being fixed to the metal shell 3 separately, so that the same plate material can be fully utilized, and the fixing spring piece 4 can also be formed on the metal shell 3 while forming the metal shell 3, and the fixing spring piece 4 in this embodiment extends obliquely upward.

[0034] Further, see Figure 2 and Figure 3 As shown, in some embodiments, the plug-in portion 21 is provided with a small hole 24, and the small hole 24 is used for the plug-in portion 21 to interlock with the circuit board 6. Among them, the circuit board 6 can be provided with a protrusion, and when the plug-in portion 21 is inserted into the plug-in hole 61 of the circuit board 6, the protrusion on the circuit board 6 can protrude into the small hole 24 and cooperate with the small hole 24. By providing the small hole 24 on the plug-in portion 21, the new pre-charging resistor and the circuit board 6 can be connected by insertion, and while achieving electrical conduction between the conductive terminal 2 and the circuit board 6, it can also prevent the conductive terminal 2 from falling out of the plug-in hole 61. In this embodiment, the upper end of the plug-in portion 21 can be provided with a slope surface to guide the plug-in portion 21 to be inserted into the plug-in hole 61 of the circuit board 6.

[0035] Further, see Figure 1 As shown, in some embodiments, an insulating sheet 5 may be provided between the fixing body 1 and the metal shell 3. The insulating sheet 5 may effectively isolate the fixing body 1 and the metal shell 3, thereby improving the insulation risk between the fixing body 1 and the metal shell 3 under high humidity conditions.

[0036] On the other hand, see Figure 3 As shown, the embodiment of the present application further provides a pre-charging module, which includes the above-mentioned new pre-charging resistor, a circuit board 6 and a fixed shell, wherein the circuit board 6 is provided with a plug hole 61, and the plug hole 61 is plugged with the conductive terminal 2 of the new pre-charging resistor; the fixed shell 7 is fixed with the fixing spring 4 of the new pre-charging resistor, and the new pre-charging resistor can be fixed by the fixing shell 7 and the fixing spring 4. This embodiment can adopt the new pre-charging resistor provided in any of the above-mentioned embodiments, which will not be repeated here.

[0037] Further, see Figure 3 As shown, in some embodiments, a cavity 71 and a locking groove 72 that are interconnected are provided in the fixed shell 7, the locking groove 72 penetrates the fixed shell 7 in a direction away from the circuit board 6, and the cavity 71 penetrates the fixed shell 7 in a direction close to the circuit board 6; the new pre-charging resistor is installed in the cavity 71, and the fixing spring 4 is inserted into the locking groove 72, and the locking groove 72 effectively prevents the new pre-charging resistor from escaping from the shell.

[0038] The fixed housing 7 is provided with a cavity 71 and a locking groove 72 which are connected to each other, and a step is formed at the connection point. The fixing spring sheet 4 can be pressed against the step to fix the new pre-charging resistor in the fixed housing 7 .

[0039] Further, see Figure 3 As shown, in some embodiments, a shock-absorbing buffer pad 8 is sandwiched between the bottom surface of the metal shell 3 and the fixed shell 7. In this embodiment, the shock-absorbing buffer pad 8 is provided to effectively reduce the shaking frequency of the new pre-charging resistor during fixation or use.

[0040] Further, see Figure 1 As shown, in some embodiments, the metal shell 3 includes a frame and two metal plates, the frame is wrapped around the bottom surface and two opposite sides of the fixed body 1; the two metal plates are fixed to the frame and distributed on the other two opposite sides of the fixed body 1, and each metal plate is provided with a fixing spring 4. In this embodiment, the frame is wrapped around the bottom surface and the front and rear sides of the fixed body 1, and the frame is also made of metal. The two metal plates are covered on the left and right sides of the fixed body 1, one fixing spring 4 is located on the left, and the other fixing spring 4 is located on the right, and the metal plates and the frame can be fixed by welding. In addition, in this embodiment, the metal shell 3 is divided into several separate parts, namely, the frame and the two metal plates, which not only makes the metal shell 3 easy to form, but also allows the frame to be assembled with the fixed body 1 first, and then the two metal plates are fixed to the two sides of the frame, so as to facilitate the assembly of the metal shell 3 with the fixed body 1. Among them, since the metal shell 3 and the fixing spring 4 are made of metal materials, which are easy to stamp and form, the dimensional tolerance of the new pre-charging resistor is more convenient to control, which is very conducive to automated assembly.

[0041] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0042] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0043] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A novel pre-charge resistor, characterized in that: It includes: A fixed body (1), the fixed body (1) being fixed with a conductive terminal (2), the conductive terminal (2) having an inserting portion (21), the inserting portion (21) being used for inserting into an inserting hole (61) of a circuit board (6); A metal shell (3), the metal shell (3) is wrapped around the outside of the fixed body (1), and the metal shell (3) is provided with a fixing spring (4).

2. The novel pre-charging resistor according to claim 1, characterized in that: The conductive terminal (2) further comprises a main body (22), wherein the main body (22) is fixed to the fixed body (1), the main body (22) is connected to the plug-in portion (21), and a height limiting boss (23) is formed at the connection between the main body (22) and the plug-in portion (21).

3. The novel pre-charging resistor according to claim 1, characterized in that: The plug-in portion (21) has a welding surface, and the welding surface is used for welding with the circuit board (6).

4. The novel pre-charging resistor according to claim 1, characterized in that: The fixing spring piece (4) is formed by stamping from the metal shell (3), and the fixing spring piece (4) extends obliquely from the connection with the metal shell (3) toward a direction close to the plug-in portion (21) and away from the fixing body (1).

5. The novel pre-charging resistor according to claim 1, characterized in that: The plug-in portion (21) is provided with a small hole (24), and the small hole (24) is used for the plug-in portion (21) to interlock with the circuit board (6).

6. The novel pre-charging resistor according to claim 1, characterized in that: An insulating sheet (5) is provided between the fixed body (1) and the metal shell (3).

7. A pre-charge module, characterized in that: include: The novel pre-charging resistor according to any one of claims 1 to 6; A circuit board (6), the circuit board (6) being provided with a plug hole (61), the plug hole (61) being plugged into and matched with the conductive terminal (2) of the novel pre-charging resistor; A fixed shell (7) is fixedly engaged with a fixing spring (4) of the novel pre-charging resistor.

8. The pre-filled module according to claim 7, characterized in that: The fixed housing (7) is provided with a cavity (71) and a locking groove (72) which are interconnected, the locking groove (72) penetrating the fixed housing (7) in a direction away from the circuit board (6), and the cavity (71) penetrating the fixed housing (7) in a direction approaching the circuit board (6); The novel pre-charging resistor is installed in the cavity (71), and the fixing spring sheet (4) is inserted into the locking groove (72).

9. The pre-filled module according to claim 7, characterized in that: A shock-absorbing cushion (8) is sandwiched between the bottom surface of the metal shell (3) of the novel pre-charging resistor and the fixed shell (7).

10. The pre-filled module according to claim 7, characterized in that: The metal housing (3) comprises: A frame, the frame wrapping the bottom surface and two opposite side surfaces of the fixed body (1) of the novel pre-charging resistor; Two metal plates, both of which are fixed to the frame and are distributed on the other two opposite side surfaces of the fixed body (1), and each of the metal plates is provided with the fixing spring sheet (4).

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