Pre-charging loop integration module and high-voltage distribution box

Abstract

The utility model relates to a pre-charging loop integration module and a high-voltage distribution box. The pre-charging loop integration module comprises a main relay, a printed circuit board and a pre-charging loop. The printed circuit board extends along the surface of the main relay, the printed circuit is connected with positive and negative electrodes of the main relay from the first side surface of the main relay and extends to the second side surface of the main relay, and the pre-charging loop is connected with the printed circuit at the second side of the main relay to obtain power supply. On one hand, the pre-charging loop can be arranged on the second side of the main relay, the surface area of the main relay is fully utilized, and the overall structure is more compact; and on the other hand, the requirement of the pre-charging loop for heat dissipation is low, so that the pre-charging loop integrated module provided by the utility model does not cause defects in the aspect of heat dissipation, and practical application is facilitated.

Description

Technical Field

[0001] The present application relates to the field of lithium battery technology, and in particular to a pre-charge circuit integrated module and a high-voltage distribution box. Background Art

[0002] In existing technology, a power battery pack consists of several major components: battery modules, liquid cooling plates, high and low voltage wiring harnesses, a battery distribution unit (BDU), a battery management system (BMS), and a housing. The BDU is a high-voltage distribution box. The battery modules occupy the vast majority of the pack, leaving limited space for the high-voltage distribution box. However, the electrical components in the high-voltage distribution box are crucial to the battery pack's ability to charge and discharge properly. Internal safety clearances and creepage distances place certain space requirements on the installation of these components.

[0003] The battery pack circuit breaker unit includes: main positive relay, main negative relay, fast charge positive relay, fast charge negative relay, pre-charge resistor, pre-charge relay, current sensor, main fuse, high and low voltage wiring harness, etc. The industry has clear national standards for the installation of high-voltage distribution boxes and the safety clearance of electrical components. Many solutions cannot reasonably arrange electrical components due to insufficient space, or due to limited space, the high-voltage distribution box layout is complex and costly. In order to reduce the space occupied by electrical components in the high-voltage distribution box, there are some integrated electrical component modules in the existing technology, such as the positive electrode module, which is composed of a fuse, a main positive relay, and a pre-charge relay. This integrated small module reduces the space occupied but at the same time leads to a decrease in the heat dissipation performance of the module, so the actual application effect is not ideal. Utility Model Content

[0004] In view of this, the embodiments of the present application provide a pre-charging circuit integrated module and a high-voltage distribution box to solve the defects in the space design of the high-voltage distribution box in the background technology.

[0005] In a first aspect, an embodiment of the present application provides a pre-fill circuit integrated module, comprising:

[0006] A main relay comprising a first side surface and a second side surface, wherein the second side surface intersects with the first side surface; the first side surface has a positive contact and a negative contact;

[0007] A printed circuit board comprising a first board surface, a second board surface, and printed circuits, wherein the first board surface is arranged along the first side surface, the second board surface is connected to the first board surface and arranged along the second side surface; the printed circuits extend along the surfaces of the first board surface and the second board surface;

[0008] A pre-filling circuit is connected to the second board surface; the pre-filling circuit is connected to the positive electrode contact and the negative electrode contact through the printed circuit.

[0009] In combination with the first aspect of the present application, in an optional embodiment, fixing holes are formed on both the positive contact and the negative contact, and the first plate surface is fixedly connected to the main relay via a fixing member connected to the fixing holes.

[0010] In combination with the first aspect of the present application, in an optional embodiment, the fixing hole is a threaded hole, and the fixing member is a screw or a bolt; the first board surface has two through holes for the fixing member to pass through, and the two through holes correspond to the fixing holes of the positive contact and the negative contact respectively, and the printed circuit includes a positive pin and a negative pin, and the positive pin and the negative pin are respectively arranged around the two through holes.

[0011] In combination with the first aspect of the present application, in an optional embodiment, the pre-charging circuit includes a pre-charging resistor and a pre-charging relay, the pre-charging resistor and the pre-charging relay are arranged in parallel, and the pre-charging resistor and the pre-charging relay are connected in series through the printed circuit.

[0012] In conjunction with the first aspect of the present application, in an optional embodiment, the printed circuit includes:

[0013] an outer circuit extending along an edge of the second plate surface, with one end connected to the positive contact and the other end connected to the negative contact;

[0014] an inner circuit, located in an area enclosed by the outer circuit and connected to the outer circuit;

[0015] The pre-charging resistor and the pre-charging relay are connected to the inner circuit and are connected in series through the inner circuit. The pre-charging resistor and the pre-charging relay are connected to the outer circuit and are connected in parallel with the main relay through the outer circuit.

[0016] In combination with the first aspect of the present application, in an optional embodiment, the pre-filling circuit integrated module further includes a socket, which is connected to the second board surface. The socket is located on one side of the pre-filling relay and is connected to the pre-filling relay through the inner line to power the pre-filling relay.

[0017] In combination with the first aspect of the present application, in an optional embodiment, the outer circuit, the inner circuit and the second plate surface are formed with four jacks for plugging in at positions corresponding to the sockets; two of the jacks are respectively connected to the positive contact and the negative contact through the outer circuit for detecting and obtaining the voltage between the positive and negative poles of the main relay; the other two jacks are respectively connected to the input end of the pre-charge relay through the inner circuit.

[0018] In combination with the first aspect of the present application, in an optional embodiment, a plurality of slots are formed on the printed circuit and the second board surface, and the pins of the pre-charging resistor and the pre-charging relay are inserted into the corresponding slots.

[0019] In combination with the first aspect of the present application, in an optional embodiment, a protrusion is protruded from the first side surface, and the protrusion is located between the positive contact and the negative contact. The first board surface is provided with a card slot, and the card slot and the protrusion are engaged with each other.

[0020] In the second aspect, an embodiment of the present application provides a high-voltage distribution box, including the pre-charging circuit integrated module described in the first aspect, the high-voltage distribution box includes a base plate, the bottom of the main relay is connected to the base plate, and the first side surface is located on the top of the main relay.

[0021] The pre-charge circuit integrated module and high-voltage distribution box provided in the embodiment of the present application have a printed circuit board extending along the surface of the main relay, and the printed circuit is connected to the positive and negative poles of the main relay from the first side surface, and extends to the second side surface of the main relay. The pre-charge circuit is connected to the printed circuit on the second side of the main relay to obtain power. On the one hand, the pre-charge circuit integrated module and high-voltage distribution box provided in the embodiment of the present application can realize that the pre-charge circuit is set on the second side of the main relay, avoiding the space on the first side of the main relay, making full use of the surface area of ​​the main relay, and making the overall structure more compact; on the other hand, the pre-charge circuit has low requirements for heat dissipation, so the pre-charge circuit integrated module and high-voltage distribution box provided in the embodiment of the present application will not cause heat dissipation defects, which is beneficial to practical application.

[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0024] Figure 1A schematic diagram of the pre-fill circuit integrated module structure provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of the printed circuit board structure provided in an embodiment of the present application;

[0026] Figure 3 A schematic diagram of the main relay structure provided in an embodiment of the present application;

[0027] Figure 4 Schematic diagram of the connection structure between the printed circuit board and the pre-charge circuit provided in an embodiment of the present application.

[0028] The reference numerals in the figures are:

[0029] 1. Printed circuit board; 11. First board surface; 12. Second board surface; 13. Printed circuit; 14. Card slot;

[0030] 111, through hole; 121, slot; 131, positive pin; 132, negative pin; 133, outer circuit; 134, inner circuit;

[0031] 2. Main relay; 21. First side surface; 22. Second side surface; 23. Positive contact; 24. Negative contact; 25. Fixing hole; 26. Protrusion;

[0032] 3. Pre-charge circuit; 31. Pre-charge resistor; 32. Pre-charge relay;

[0033] 4. Socket; 41. Jack. DETAILED DESCRIPTION

[0034] To make the technical solutions and beneficial effects of the present invention more clearly understood, the following detailed description is given by way of specific embodiments. The accompanying drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly illustrate the details of the local features. Unless otherwise defined, the technical and scientific terms used herein have the same meanings as those in the technical field to which this application belongs.

[0035] In the description of the present invention, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "height", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and so on, indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of simplifying the description of the present invention, and do not indicate that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and should not be understood as a limitation to the present invention.

[0036] In this utility model, the terms "first" and "second" are used solely for descriptive purposes and should not be construed as indicating the relative importance of the features indicated or the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two or three, and "several" means at least one, such as one, two, or three, unless otherwise expressly specified.

[0037] In this utility model, unless otherwise expressly defined, the terms "install," "connect," "connect," "fix," "dispose," etc. should be understood broadly. For example, "connect" can mean fixed, removable, or integrated; it can mean mechanical or electrical; it can mean direct or indirect connection through an intermediary; it can also mean internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on the specific circumstances.

[0038] In the present invention, unless otherwise clearly defined, when a first feature is “on,” “above,” “above,” “above,” “below,” “below,” or “below” a second feature, the first feature and the second feature may be in direct contact, or the first feature and the second feature may be in indirect contact via an intermediate medium. Moreover, when a first feature is “on,” “above,” or “above” a second feature, it may mean that the first feature is directly above or obliquely above the second feature, or simply means that the horizontal height of the first feature is higher than the horizontal height of the second feature. When a first feature is “below,” “below,” or “below” a second feature, it may mean that the first feature is directly below or obliquely below the second feature, or simply means that the horizontal height of the first feature is lower than the horizontal height of the second feature.

[0039] In order to fully understand the present application, detailed steps and detailed structures will be presented in the following description to illustrate the technical solution of the present application. The preferred embodiments of the present application are described in detail below. However, in addition to these detailed descriptions, the present application may also have other implementation methods.

[0040] This embodiment provides a pre-filling circuit integrated module, which is a module installed in a high-voltage distribution box. Figure 1 As shown, it includes: a main relay 2, a printed circuit board 1 and a pre-charge circuit 3.

[0041] like Figure 3 As shown, the main relay 2 includes a first side surface 21 and a second side surface 22, the second side surface 22 intersecting the first side surface 21; the first side surface 21 has a positive contact 23 and a negative contact 24. Figure 1 、 Figure 2 As shown, printed circuit board 1 includes a first surface 11, a second surface 12, and printed wiring 13. First surface 11 is arranged along first side surface 21, and second surface 12 is connected to first surface 11 and arranged along second side surface 22. Printed wiring 13 extends along first and second surfaces 11, 12. Pre-charge circuit 3 is connected to second surface 12; pre-charge circuit 3 is connected to positive contact 23 and negative contact 24 via printed wiring 13.

[0042] In the pre-charge circuit integrated module provided in this embodiment, a printed circuit board 1 extends along the surface of a main relay 2. A printed circuit 13 connects the positive and negative electrodes of the main relay 2 from a first side surface 21 thereof and extends to a second side surface 22 thereof. The pre-charge circuit 3 is connected to the printed circuit 13 on the second side of the main relay 2 to obtain power. On the one hand, the pre-charge circuit integrated module provided in this embodiment enables the pre-charge circuit 3 to be positioned on the second side of the main relay 2, fully utilizing the surface area of ​​the main relay 2 and making the overall structure more compact. On the other hand, the pre-charge circuit 3 has low heat dissipation requirements, so the pre-charge circuit integrated module provided in this embodiment does not cause heat dissipation defects, which is beneficial for practical applications.

[0043] The main relay 2 mentioned above may be a main positive relay and / or a main negative relay, and generally a main positive relay is used.

[0044] In an optional embodiment, if Figure 2 As shown, fixing holes 25 are formed in both the positive contact 23 and the negative contact 24. The first board surface 11 is fixedly connected to the main relay 2 via fixing members connected to the fixing holes 25. In this embodiment, the design of fixing holes 25 in the positive contact 23 and the negative contact 24 facilitates the fixing of the printed circuit board 1. After the fixing members are connected to the fixing holes 25, the printed circuit board 1 can be fixed to the main relay 2, simplifying assembly.

[0045] In an optional embodiment, the fixing hole 25 is a threaded hole, and the fixing member is a screw or a bolt; Figure 2 、 Figure 3 As shown, the first board surface 11 has two through-holes 111 for passage of fixing members. The two through-holes 111 are arranged corresponding to the fixing holes 25 of the positive contact 23 and the negative contact 24, respectively. The printed circuit 13 includes a positive pin 131 and a negative pin 132, which are arranged around the two through-holes 111. In this embodiment, screws or bolts are used as fasteners. On the one hand, it can conveniently connect the fixing holes 25 to complete the installation of the printed circuit board 1. On the other hand, the conductive ability of the screws or bolts is utilized to achieve the electrical connection between the positive pin 131 and the positive contact 23, and the negative pin 132 and the negative contact 24. This simple structure and stable conductivity are achieved.

[0046] In an optional embodiment, the printed circuit 13 is composed of a plurality of copper sheets, wherein the positive pin 131 and the negative pin 132 are circular copper sheets. After being connected to the fixing hole 25 by screws or bolts, the positive pin 131 and the negative pin 132 are respectively connected to the positive contact 23 and the negative contact 24.

[0047] In an optional embodiment, if Figure 4 As shown, the pre-charging circuit 3 includes a pre-charging resistor 31 and a pre-charging relay 32. The pre-charging resistor 31 and the pre-charging relay 32 are arranged in parallel, and the pre-charging resistor 31 and the pre-charging relay 32 are connected in series via a printed circuit 13. In this embodiment, by arranging the pre-charging resistor 31 and the pre-charging relay 32 in parallel, the total area occupied by the two is relatively small. The pre-charging resistor 31 and the pre-charging relay 32 are connected in series via the printed circuit 13, which reduces the use of wiring harnesses and effectively reduces the space occupied by the pre-charging circuit in the high-voltage distribution box.

[0048] In an optional embodiment, if Figure 2 As shown, the printed circuit 13 includes: an outer circuit 133 and an inner circuit 134. The outer circuit 133 extends along the edge of the second board surface 12, with one end connected to the positive contact 23 and the other end connected to the negative contact 24; the inner circuit 134 is located in the area surrounded by the outer circuit 133 and is connected to the outer circuit 133; the pre-charging resistor 31 and the pre-charging relay 32 are connected to the inner circuit 134 and are connected in series through the inner circuit 134, and the pre-charging resistor 31 and the pre-charging relay 32 are connected to the outer circuit 133 and are connected in parallel with the main relay 2 through the outer circuit 133. In this embodiment, the inner circuit 134 is arranged in the space surrounded by the outer circuit 133, which is conducive to controlling the occupied area of ​​the printed circuit 13 within a smaller range, and the inner circuit 134 can realize the series connection between the pre-charging resistor 31 and the pre-charging relay 32, and the outer circuit 133 realizes the parallel connection of the two with the main relay 2.

[0049] In an optional embodiment, if Figure 2 、 Figure 4 As shown, the pre-filling circuit integrated module further includes a socket 4, which is connected to the second board surface 12. The socket 4 is located on one side of the pre-filling relay 32 and is connected to the pre-filling relay 32 via an inner line 134 to power the pre-filling relay 32. In this embodiment, the socket 4 occupies a space on one side of the pre-filling relay 32 for arrangement, eliminating the need for additional space on the pre-filling circuit integrated module, and is connected to the pre-filling relay 32 via the inner line 134 to facilitate powering it.

[0050] In an optional embodiment, if Figure 2 、 Figure 4As shown, four plug-in sockets 41 are formed between the outer circuit 133, the inner circuit 134, and the second board surface 12 at locations corresponding to the socket 4. Two of these sockets 41 are connected to the positive contact 23 and the negative contact 24, respectively, via the outer circuit 133, for detecting the voltage between the positive and negative poles of the main relay 2. The other two sockets 41 are connected to the input terminals of the pre-charge relay 32 via the inner circuit 134. In this embodiment, the provision of the socket 4 enables the use of a smaller plug for power connection on the printed circuit board 1. The socket 4 also integrates the voltage acquisition line interface of the main relay 2, resulting in a high level of integration and a reduced module size.

[0051] In an optional embodiment, if Figure 2 、 Figure 4 As shown, a plurality of slots 121 are formed on the printed circuit 13 and the second board surface 12, and the pins of the pre-charging resistor 31 and the pre-charging relay 32 are inserted into the corresponding slots 121. In this embodiment, the provision of the slots 121 on the second board surface 12 facilitates the installation and fixation of the pre-charging resistor 31 and the pre-charging relay 32, and also makes it easier to ensure that both are in good contact with the printed circuit 13.

[0052] In an optional embodiment, if Figure 3 、 Figure 4 As shown, a protrusion 26 is formed on the first side surface 21, and is located between the positive contact 23 and the negative contact 24. A latching slot 14 is provided on the first board surface 11, and the latching slot 14 and the protrusion 26 engage with each other. In this embodiment, the protrusion 26 on the first side surface 21, in conjunction with the latching slot 14, can provide a certain positioning function during the installation of the printed circuit board 1, ensuring that the printed circuit board 1 is accurately positioned when the printed circuit board 1 is installed.

[0053] This embodiment provides a high-voltage distribution box, including the above-mentioned pre-charging circuit integrated module, the high-voltage distribution box includes a base plate, the bottom of the main relay 2 of the pre-charging circuit integrated module is connected to the base plate, and the first side surface 21 is located on the top of the main relay 2.

[0054] The high-voltage distribution box provided in this embodiment features a pre-charge circuit integrated module with high integration density and a small footprint. This reduces wiring harness connection points, increases safety clearances for other important electrical components, and reduces the number of assembly steps required for the pre-charge circuit. The pre-charge circuit integrated module also has low heat dissipation requirements and can be flexibly installed to accommodate various electrical layouts.

[0055] The assembly steps of the pre-charging circuit of the high-voltage distribution box provided in this embodiment include:

[0056] 1. Lay the first surface 11 of the printed circuit board 1 on the first side surface 21 of the main relay 2, and the second surface 12 of the printed circuit board 1 on the second side surface 22 of the main relay 2, and then fix the printed circuit board 1 to the main relay 2;

[0057] 2. Connect the pre-filling circuit 3 to the second board surface 12, so that the pre-filling circuit 3 is connected to the positive contact 23 and the negative contact 24 through the printed circuit 13. The pre-filling circuit integrated module is assembled.

[0058] 3. Install the pre-charge circuit integration module into the high-voltage distribution box and secure the bottom of the pre-charge circuit integration module's main relay 2 to the high-voltage distribution box base. Connect the power supply to pre-charge circuit 3. The pre-charge circuit integration module is now installed.

[0059] In an optional embodiment, the power supply of the pre-charging circuit 3 in this embodiment is 12V power supply.

[0060] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations of the claims. Various modifications and variations may be made to the above embodiments without departing from the scope of the present disclosure. Similarly, the various technical features of the above embodiments may be arbitrarily combined to form additional embodiments of the present application that may not be explicitly described. Therefore, the above embodiments merely illustrate several implementations of the present application and do not limit the scope of protection of the patent application.

Claims

1. A pre-filling circuit integrated module, characterized in that: include: A main relay (2) comprises a first side surface (21) and a second side surface (22), wherein the second side surface (22) intersects with the first side surface (21); the first side surface (21) has a positive contact (23) and a negative contact (24); A printed circuit board (1) comprises a first board surface (11), a second board surface (12) and a printed circuit (13), wherein the first board surface (11) is arranged along the first side surface (21), and the second board surface (12) is connected to the first board surface (11) and arranged along the second side surface (22); the printed circuit (13) extends along the surfaces of the first board surface (11) and the second board surface (12); A pre-filling circuit (3) is connected to the second plate surface (12); the pre-filling circuit (3) is connected to the positive electrode contact (23) and the negative electrode contact (24) through the printed circuit (13).

2. The pre-fill circuit integrated module according to claim 1, characterized in that: A fixing hole (25) is formed on both the positive contact (23) and the negative contact (24), and the first plate surface (11) is fixedly connected to the main relay (2) via a fixing member connected to the fixing hole (25).

3. The pre-fill circuit integrated module according to claim 2, characterized in that: The fixing hole (25) is a threaded hole, and the fixing piece is a screw or a bolt; the first plate surface (11) has two through holes (111) for the fixing piece to pass through, and the two through holes (111) are arranged corresponding to the fixing holes (25) of the positive contact (23) and the negative contact (24), respectively; the printed circuit (13) includes a positive pin (131) and a negative pin (132), and the positive pin (131) and the negative pin (132) are arranged around the two through holes (111), respectively.

4. The pre-fill circuit integrated module according to claim 1, characterized in that: The pre-charging circuit (3) comprises a pre-charging resistor (31) and a pre-charging relay (32), wherein the pre-charging resistor (31) and the pre-charging relay (32) are arranged in parallel, and the pre-charging resistor (31) and the pre-charging relay (32) are connected in series via the printed circuit (13).

5. The pre-fill circuit integrated module according to claim 4, characterized in that: The printed circuit (13) comprises: An outer circuit (133) extends along the edge of the second plate surface (12), one end of which is connected to the positive contact (23) and the other end of which is connected to the negative contact (24); an inner circuit (134) located within the area enclosed by the outer circuit (133) and connected to the outer circuit (133); The pre-charging resistor (31) and the pre-charging relay (32) are connected to the inner circuit (134) and are connected in series via the inner circuit (134); the pre-charging resistor (31) and the pre-charging relay (32) are connected to the outer circuit (133) and are connected in parallel with the main relay (2) via the outer circuit (133).

6. The pre-fill circuit integrated module according to claim 5, characterized in that: The pre-filling circuit integrated module further comprises a socket (4), the socket (4) being connected to the second panel (12), the socket (4) being located on one side of the pre-filling relay (32), and being connected to the pre-filling relay (32) via the inner line (134) to supply power to the pre-filling relay (32).

7. The pre-fill circuit integrated module according to claim 6, characterized in that: Four jacks (41) for plug insertion are formed on the outer circuit (133), the inner circuit (134) and the second panel (12) at positions corresponding to the socket (4); two of the jacks (41) are respectively connected to the positive contact (23) and the negative contact (24) through the outer circuit (133) for detecting and obtaining the voltage between the positive and negative poles of the main relay (2); and the other two jacks (41) are respectively connected to the input end of the pre-charge relay (32) through the inner circuit (134).

8. The pre-fill circuit integrated module according to claim 4, characterized in that: A plurality of slots (121) are formed on the printed circuit (13) and the second board surface (12), and the pins of the pre-charging resistor (31) and the pre-charging relay (32) are inserted into the corresponding slots (121).

9. The pre-fill circuit integrated module according to claim 1, characterized in that: A protrusion (26) is protruded from the first side surface (21), and the protrusion (26) is located between the positive contact (23) and the negative contact (24). A card slot (14) is provided on the first plate surface (11), and the card slot (14) and the protrusion (26) are engaged with each other.

10. A high voltage distribution box, characterized in that: It comprises a pre-charging circuit integrated module as described in any one of claims 1 to 9, wherein the high-voltage distribution box comprises a base plate, the bottom of the main relay (2) is connected to the base plate, and the first side surface (21) is located on the top of the main relay (2).

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