Circuit board assembly

Abstract

The utility model relates to the technical field of flexible circuit boards, in particular to a circuit board assembly which comprises a main FPC, an auxiliary FPC and a sensor module, the main FPC and the auxiliary FPC are arranged in a stacked mode, a gap structure communicated with the outside is arranged between the main FPC and the auxiliary FPC, the sensor module is installed on the auxiliary FPC and electrically connected with the auxiliary FPC, and the sensor module is electrically connected with the auxiliary FPC. A wave absorbing layer is arranged between the main FPC and the auxiliary FPC; the main FPC is provided with a main output area, the auxiliary FPC is provided with an auxiliary input area, the main output area is provided with a main output bonding pad which is in circuit connection with the main FPC, and the auxiliary input area is provided with an auxiliary input bonding pad which is in circuit connection with the auxiliary FPC and corresponds to the main output bonding pad; and the main output bonding pad is connected with the auxiliary input bonding pad in a matching manner. The circuit board assembly provided by the utility model can solve the technical problem that the multi-layer interconnected FPC is poor in heat dissipation performance and shielding performance.

Description

[Technical field]

[0001] The utility model relates to the technical field of flexible circuit boards, in particular to a circuit board assembly. [Background technology]

[0002] Power batteries are the power source of new energy vehicles. They can store and release electrical energy through the mutual conversion of electrical energy and chemical energy. Good use and monitoring of power batteries are crucial to the long life and safety of new energy vehicles. FPC, as a printed circuit board with high reliability, excellent flexibility and high integration, is widely used in power batteries. It is used to connect various modules inside the power battery, transmit electrical energy and data signals, and realize the monitoring and control of the battery status; and FPC, as a connection line for temperature sensors, can sense the temperature changes inside the battery pack in real time and transmit relevant data to BMS for processing. However, the existing FPC for power batteries has poor heat dissipation performance, the battery current transmission and sensor measurement work independently, and it is impossible to eliminate the interference of the battery transmission current on the sensor, which is different from the actual monitoring of the battery. [Contents of the utility model]

[0003] In order to solve the technical problem that the heat dissipation performance and shielding performance of the multi-layer interconnected FPC are poor, the utility model provides a circuit board assembly.

[0004] The utility model solves the technical problem by providing a circuit board assembly, including a main FPC, an auxiliary FPC and a sensor module, wherein the main FPC and the auxiliary FPC are stacked, and a gap structure communicating with the outside is arranged between the two, the sensor module is mounted on the auxiliary FPC and electrically connected to the auxiliary FPC, and an absorbing layer is arranged between the main FPC and the auxiliary FPC; a main output area is arranged on the main FPC, an auxiliary input area is arranged on the auxiliary FPC, a main output pad connected to the main FPC circuit is arranged on the main output area, and an auxiliary input pad connected to the auxiliary FPC circuit and corresponding to the main output pad is arranged on the auxiliary input area; the main output pad is cooperatively connected with the auxiliary input pad.

[0005] Preferably, the sensor module and the corresponding auxiliary input area are respectively located at two ends of the auxiliary FPC, and the sensor module is electrically connected to the auxiliary input pad.

[0006] Preferably, a connecting piece is provided on the main FPC, and the connecting piece is connected to the main FPC and conducts electricity to the main FPC.

[0007] Preferably, the main output pads and the auxiliary input pads are distributed in a two-dimensional matrix on the corresponding main output area and auxiliary input area.

[0008] Preferably, main output test pads are arranged at the edge of the main output area, auxiliary input test pads corresponding to the main output test pads are evenly arranged at the edge of the auxiliary input area, and the main output test pads are cooperatively connected with the auxiliary input test pads.

[0009] Preferably, the auxiliary input pad is provided with a tin-conducting via, and the main output pad and the auxiliary input pad are welded through the tin-conducting via; the auxiliary input test pad is provided with the tin-conducting via, and the main output test pad and the auxiliary input test pad are welded through the tin-conducting via.

[0010] Preferably, the tin-conducting via hole is an elliptical hole or a cross-shaped hole, and solder is melted into the tin-conducting via hole.

[0011] Preferably, at least one exhaust hole is provided on the auxiliary input area, and the exhaust hole passes through the auxiliary FPC.

[0012] Preferably, a connection layer is provided between a partial area of ​​the absorbing layer of the main FPC and the absorbing layer of the auxiliary FPC.

[0013] Preferably, a partial area between the main FPC and the auxiliary FPC is connected via a welding point and a connection layer, and a gap structure is provided between other areas.

[0014] Compared with the prior art, the circuit board assembly provided by the utility model has the following advantages:

[0015] 1. The utility model provides a circuit board assembly, comprising a main FPC, an auxiliary FPC and a sensor module, wherein the main FPC and the auxiliary FPC are stacked, and a gap structure communicating with the outside is arranged between the two, the sensor module is mounted on the auxiliary FPC and electrically connected to the auxiliary FPC, and an absorbing layer is arranged between the main FPC and the auxiliary FPC; a main output area is arranged on the main FPC, an auxiliary input area is arranged on the auxiliary FPC, a main output pad connected to the main FPC circuit is arranged on the main output area, and an auxiliary input pad connected to the auxiliary FPC circuit and corresponding to the main output pad is arranged on the auxiliary input area; the main output pad is cooperatively connected with the auxiliary input pad. The utility model has a simple structure. By arranging a gap structure between the main FPC and the auxiliary FPC, the heat of the adjacent sides of the main FPC and the auxiliary FPC can be dissipated to the outside through the gap structure, which is equivalent to increasing the heat dissipation area of ​​the main FPC and the auxiliary FPC, so that the circuit board assembly has good heat dissipation performance. When applied to a power battery, it can prevent the power battery from overheating during operation and current transmission, and effectively improve the life and safety of the power battery; and the absorbing material layer effectively shields the influence of large current on the sensor module, so that the FPC has good heat dissipation performance and shielding performance.

[0016] 2. The utility model provides a circuit board assembly, wherein the sensor module and the corresponding auxiliary input area are respectively located at two ends of the auxiliary FPC, and the sensor module is electrically connected to the auxiliary input pad to achieve power battery current transmission and battery status monitoring at the same time, saving the internal space of the battery module and indirectly improving the energy density of the power battery.

[0017] 3. The utility model provides a circuit board assembly, wherein a connecting piece is provided on the main FPC, and the connecting piece is connected to the main FPC and conducts electricity to the main FPC, thereby realizing conduction of the circuit in the main FPC.

[0018] 4. The utility model provides a circuit board assembly, in which the main output pads and the auxiliary input pads are evenly distributed on the corresponding main output area and the auxiliary input area, so that the main output area and the auxiliary input area can be arranged with more main output pads and auxiliary input pads, and the arrangement quantity can be flexibly adjusted.

[0019] 5. The utility model provides a circuit board assembly, wherein the edge of the main output area is provided with a main output test pad, the edge of the auxiliary input area is evenly provided with auxiliary input test pads corresponding to the main output test pad, and the main output test pad is cooperatively connected with the auxiliary input test pad. On the basis of the connection between the main output pad and the auxiliary input pad, the connection between the main output test pad and the auxiliary input test pad makes the connection between the main FPC and the auxiliary FPC more stable and safe.

[0020] 6. The utility model provides a circuit board assembly, wherein the auxiliary input pad is provided with a tin-conducting via hole, and the main output pad and the auxiliary input pad are welded through the tin-conducting via hole; the auxiliary input test pad is provided with the tin-conducting via hole, and the main output test pad and the auxiliary input test pad are welded through the tin-conducting via hole. Through the tin-conducting via hole welding, the auxiliary input pad and the main output pad, and the main output test pad and the auxiliary input test pad are welded more firmly, the contact is more complete, and the occurrence of poor contact and the like is prevented.

[0021] 7. The utility model provides a circuit board assembly, wherein the tin-conducting via is an elliptical hole or a cross-shaped hole, and solder is melted into the tin-conducting via, so that the pad has more tin-conducting channels under the same area, which is conducive to the solder to flow smoothly into the tin-conducting via, effectively avoiding the occurrence of cold soldering, insufficient soldering and other undesirable phenomena.

[0022] 8. The utility model provides a circuit board assembly, wherein the auxiliary input area is provided with at least one exhaust hole, and the exhaust hole passes through the auxiliary FPC. During welding, air is discharged through the exhaust hole, which can also speed up the flow of solder, ensure sufficient solder, effectively prevent cold solder joints, and make the welding performance stable and the product quality high.

[0023] 9. In the circuit board assembly provided by the utility model, a connection layer is provided between the wave absorbing layer of the main FPC and the partial area of ​​the wave absorbing layer of the auxiliary FPC. The connection layer is used to pre-fix the main FPC and the auxiliary FPC to ensure that the subsequent welding has high accuracy and precision and reduce the defect rate.

[0024] 10. The utility model provides a circuit board assembly, in which some areas between the main FPC and the auxiliary FPC are connected by welding points and a connection layer, and a gap structure is set between other areas. The gap structure helps to improve the good heat dissipation performance and prevent the circuit board assembly from overheating and affecting the working performance when the current is transmitted.

Brief Description of the Drawings

[0025] Figure 1 This is a schematic diagram of the main FPC structure provided by the first embodiment of the utility model Figure 1 .

[0026] Figure 2 This is a schematic diagram of the main FPC structure provided by the first embodiment of the utility model Figure 2 .

[0027] Figure 3 It is a schematic diagram of the auxiliary FPC structure provided by the first embodiment of the utility model.

[0028] Figure 4 This is a schematic diagram of the structure of a circuit board assembly provided by the first embodiment of the utility model.

[0029] Figure 5 A schematic cross-sectional view of a circuit board assembly provided in the first embodiment of the utility model Figure 1 .

[0030] Figure 6 A schematic cross-sectional view of a circuit board assembly provided in the first embodiment of the utility model Figure 2 .

[0031] Description of the accompanying drawings:

[0032] 1. Main FPC; 2. Auxiliary FPC; 3. Absorbing layer; 4. Sensor module; 5. Solder; 6. Exhaust hole; 7. Connection layer; 8. Gap structure;

[0033] 11. Main output area; 12. Connecting piece; 13. Connecting piece welding point; 21. Auxiliary input area;

[0034] 111, main output pad; 112, main output test pad; 211, auxiliary input pad; 212, auxiliary input test pad; 213, tin-conducting via; 214, metal layer. [Specific implementation method]

[0035] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below with reference to the accompanying drawings and implementation examples. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0036] It should be noted that the terms "first" and "second" etc. in the specification and claims of the present utility model are used to distinguish different objects rather than to describe a specific order.

[0037] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0038] In the present invention, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly used to better describe the present invention and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0039] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in this utility model can be understood according to specific circumstances.

[0040] In addition, the terms "installed", "set", "provided with", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0041] See also Figure 1 , Figure 3 and Figure 5The first embodiment of the utility model provides a circuit board assembly, including a main FPC 1, an auxiliary FPC 2 and a sensor module 4. The main FPC 1 and the auxiliary FPC 2 are stacked, and a gap structure 8 connected to the outside is arranged between the two. The sensor module 4 is installed on the auxiliary FPC 2 and is electrically connected to the auxiliary FPC 2. An absorbing layer 3 is arranged between the main FPC 1 and the auxiliary FPC 2; a main output area 11 is arranged on the main FPC 1, and an auxiliary input area 21 is arranged on the auxiliary FPC 2. A main output pad 111 connected to the main FPC 1 circuit is arranged on the main output area 11, and an auxiliary input pad 211 connected to the auxiliary FPC 2 circuit and corresponding to the main output pad 111 is arranged on the auxiliary input area 21; the main output pad 111 is connected with the auxiliary input pad 211; the main output pad 111 is connected with the auxiliary input pad 211. The circuit board assembly provided by the utility model has a simple structure. The gap structure 8 is used to dissipate the heat on the adjacent sides of the main FPC 1 and the auxiliary FPC 2 to the outside, which is equivalent to increasing the heat dissipation area of ​​the main FPC 1 and the auxiliary FPC 2, thereby improving the heat dissipation performance. When applied to a power battery, it can prevent the power battery from overheating during operation and current transmission, thereby effectively improving the life and safety of the power battery. In addition, by setting the absorbing layer 3, the influence of the current introduced into the main FPC 1 on the sensor module 4 on the auxiliary FPC 2 is effectively shielded, thereby improving the performance of the sensor module 4, especially the magnetoelectric current sensor therein, so that the circuit board assembly has good heat dissipation performance and shielding performance.

[0042] Furthermore, the main output area 11 is connected to the circuit elements of the output signal, and outputs the signal generated by the circuit to other devices or systems for data transmission, control signals, etc.; the auxiliary input area 21 is used to receive signals from the sensor module 4 for processing and response by the circuit board assembly.

[0043] Furthermore, the sensor module 4 and the corresponding auxiliary input area 21 are respectively located at both ends of the auxiliary FPC 2, and the sensor module 4 is electrically connected to the auxiliary input pad 211, so as to monitor the power battery current transmission and battery status through the sensor module 4, save the internal space of the battery module, and indirectly improve the power battery energy density.

[0044] Furthermore, the sensor modules 4 are all configured as flexible sensors, so that the auxiliary FPC 2 has good flexibility. The end of the auxiliary FPC 2 close to the sensor module 4 can be bent and inserted between adjacent batteries of the power battery for use, thereby shortening the sensing distance, achieving a rapid response of the sensor module 4, and improving the sensitivity. At the same time, it is in direct contact with the battery assembly, reducing the difference between the measurement conditions and the actual working conditions, and improving the accuracy of the data acquired by the sensor module 4.

[0045] In this embodiment, the main FPC 1 and the auxiliary FPC 2 are both provided with an absorbing layer 3 on their opposite sides, so as to improve the shielding performance of the absorbing layer 3 on current, and the circuit board assembly can work more stably.

[0046] See also Figure 1 and Figure 2 A connecting piece 12 is provided on one side of the main FPC 1 away from the main output pad 111 . The connecting piece 12 is connected to the main FPC 1 and conducts electricity to the main FPC 1 , thereby realizing the transmission of the battery current in the main FPC 1 .

[0047] Furthermore, a connecting piece welding point 13 is provided on the main FPC 1 on the same side as the connecting piece 12 . The connecting piece 12 is made of a conductive material, one end of which is connected to the main FPC 1 , and the other end of which is welded to the busbar through the connecting piece welding point 13 .

[0048] See also Figure 1 , Figure 3 and Figure 4 The main output pads 111 and the auxiliary input pads 211 are evenly distributed on the corresponding main output area 11 and the auxiliary input area 21, so that the main output area 11 and the auxiliary input area 21 can arrange more main output pads 111 and auxiliary input pads 211, and the arrangement quantity can be flexibly adjusted.

[0049] Further, a main output test pad 112 is arranged at the edge of the main output area 11, and auxiliary input test pads 212 corresponding to the main output test pad 112 are evenly arranged at the edge of the auxiliary input area 21, and the main output test pad 112 is cooperatively connected with the auxiliary input test pad 212. On the basis of the connection between the main output pad 111 and the auxiliary input pad 211, the connection between the main output test pad 112 and the auxiliary input test pad 212 makes the connection between the main FPC 1 and the auxiliary FPC 2 more stable and safe.

[0050] Furthermore, the main FPC 1 is provided with a plurality of main output test circuits respectively connected to the main output test pads 112, and the auxiliary FPC 2 is provided with a plurality of auxiliary input test circuits respectively connected to the auxiliary input test pads 212. The main output test circuit is not connected to the main FPC 1 circuit, and the auxiliary input test circuit is not connected to the auxiliary FPC 2 circuit. The main output test circuit and the auxiliary input test circuit are used for electrical testing and signal transmission verification to ensure stable operation of the circuit board assembly.

[0051] Furthermore, the auxiliary input pad 211 is provided with a tin-conducting via 213, and the main output pad 111 and the auxiliary input pad 211 are welded through the tin-conducting via 213; the auxiliary input test pad 212 is also provided with a tin-conducting via 213, and the main output test pad 112 and the auxiliary input test pad 212 are welded through the tin-conducting via 213. The tin-conducting via 213 makes the welding of the auxiliary input pad 211 and the main output pad 111, and the welding of the main output test pad 112 and the auxiliary input test pad 212 more firm, and the contact is more sufficient, thereby preventing the occurrence of poor contact and the like.

[0052] See also Figure 3 , Figure 5 and Figure 6 The tin-conducting via 213 is an elliptical hole or a cross-shaped hole. The solder 5 is melted into the tin-conducting via 213, so that the auxiliary input pad 211 has more tin-conducting channels under the same area, which is conducive to the solder 5 flowing smoothly into the tin-conducting via 213, effectively avoiding the occurrence of cold soldering, insufficient soldering and other adverse phenomena.

[0053] Furthermore, the inner wall of the tin-conducting via 213 is plated with a metal layer 214, and the metal layer 214 of the tin-conducting via 213 on the auxiliary input pad 211 is connected to the auxiliary input pad 211. The metal layer 214 provides good conductivity, thereby ensuring the transmission of signals and the normal operation of the circuit, and by applying solder 5 on the metal layer 214, it can be better welded with other components, ensuring the reliability and stability of the welding connection.

[0054] Furthermore, at least one exhaust hole 6 is provided on the auxiliary input area 21, and the exhaust hole 6 passes through the auxiliary FPC 2. During welding, the hot air melts the solder 5 from the surface to the inside, and after the surface melts, the air inside is discharged through the exhaust hole 6, effectively avoiding the occurrence of cold solder joints. The utility model discharges air through the exhaust hole 6 during welding, and can also speed up the inflow speed of the solder 5, ensuring that the amount of solder 5 is sufficient, effectively preventing cold solder joints, and making the welding performance stable and improving product quality.

[0055] Furthermore, the tin-conducting via 213 and the exhaust hole 6 are both connected to the gap between the main FPC 1 and the auxiliary FPC 2, so that the solder 5 can better connect the main FPC 1 and the auxiliary FPC 2, and exhaust the air in the tin-conducting via 213 during the welding process, thereby improving the welding quality.

[0056] Furthermore, a connection layer 7 is provided between the absorbing layer 3 of the main FPC 1 and the absorbing layer 3 of the auxiliary FPC 2. The connection layer 7 is used to pre-fix the main FPC 1 and the auxiliary FPC 2 to ensure that subsequent welding has high accuracy and precision and reduce the defect rate.

[0057] Preferably, the connection layer 7 can be configured as an adhesive layer. In this embodiment, the connection layer 7 is a double-sided adhesive tape, and the absorbing layers 3 are connected to each other via the double-sided adhesive tape.

[0058] Furthermore, the main FPC 1 and the auxiliary FPC 2 are connected via welding points and the connection layer 7, and a gap structure 8 is provided between other parts. The gap structure 8 helps to improve the good heat dissipation performance, prevents the circuit board assembly from overheating and affecting the working performance during current transmission, and when applied to the power battery, it can prevent the power battery from overheating during operation and current transmission, and effectively improve the life and safety of the power battery.

[0059] Furthermore, in this embodiment, the main FPC 1 and the auxiliary FPC 2 both include a substrate PI and a copper foil, the surface of the copper foil is provided with a covering film, a green oil or an absorbing layer 3, and the two layers of copper foil of the auxiliary FPC 2 are connected to the main output area 11 and the upper copper foil of the main FPC 1 by gold plating in the tin-conducting via 213. Compared with the traditional multi-layer FPC, the material utilization rate of the utility model is high and the performance is more stable.

[0060] Compared with the prior art, the circuit board assembly provided by the utility model has the following advantages:

[0061] 1. The utility model provides a circuit board assembly, comprising a main FPC, an auxiliary FPC and a sensor module, wherein the main FPC and the auxiliary FPC are stacked, and a gap structure communicating with the outside is arranged between the two, the sensor module is mounted on the auxiliary FPC and electrically connected to the auxiliary FPC, and an absorbing layer is arranged between the main FPC and the auxiliary FPC; a main output area is arranged on the main FPC, an auxiliary input area is arranged on the auxiliary FPC, a main output pad connected to the main FPC circuit is arranged on the main output area, and an auxiliary input pad connected to the auxiliary FPC circuit and corresponding to the main output pad is arranged on the auxiliary input area; the main output pad is cooperatively connected with the auxiliary input pad. The utility model has a simple structure. By arranging a gap structure between the main FPC and the auxiliary FPC, the heat of the adjacent sides of the main FPC and the auxiliary FPC can be dissipated to the outside through the gap structure, which is equivalent to increasing the heat dissipation area of ​​the main FPC and the auxiliary FPC, so that the circuit board assembly has good heat dissipation performance. When applied to a power battery, it can prevent the power battery from overheating during operation and current transmission, and effectively improve the life and safety of the power battery; and the absorbing material layer effectively shields the influence of large current on the sensor module, so that the FPC has good heat dissipation performance and shielding performance.

[0062] 2. The utility model provides a circuit board assembly, wherein the sensor module and the corresponding auxiliary input area are respectively located at two ends of the auxiliary FPC, and the sensor module is electrically connected to the auxiliary input pad to achieve power battery current transmission and battery status monitoring at the same time, saving the internal space of the battery module and indirectly improving the energy density of the power battery.

[0063] 3. The utility model provides a circuit board assembly, wherein a connecting piece is provided on the main FPC, and the connecting piece is connected to the main FPC and conducts electricity to the main FPC, thereby realizing conduction of the circuit in the main FPC.

[0064] 4. The utility model provides a circuit board assembly, in which the main output pads and the auxiliary input pads are evenly distributed on the corresponding main output area and the auxiliary input area, so that the main output area and the auxiliary input area can be arranged with more main output pads and auxiliary input pads, and the arrangement quantity can be flexibly adjusted.

[0065] 5. The utility model provides a circuit board assembly, wherein the edge of the main output area is provided with a main output test pad, the edge of the auxiliary input area is evenly provided with auxiliary input test pads corresponding to the main output test pad, and the main output test pad is cooperatively connected with the auxiliary input test pad. On the basis of the connection between the main output pad and the auxiliary input pad, the connection between the main output test pad and the auxiliary input test pad makes the connection between the main FPC and the auxiliary FPC more stable and safe.

[0066] 6. The utility model provides a circuit board assembly, wherein the auxiliary input pad is provided with a tin-conducting via hole, and the main output pad and the auxiliary input pad are welded through the tin-conducting via hole; the auxiliary input test pad is provided with the tin-conducting via hole, and the main output test pad and the auxiliary input test pad are welded through the tin-conducting via hole. Through the tin-conducting via hole welding, the auxiliary input pad and the main output pad, and the main output test pad and the auxiliary input test pad are welded more firmly, the contact is more complete, and the occurrence of poor contact and the like is prevented.

[0067] 7. The utility model provides a circuit board assembly, wherein the tin-conducting via is an elliptical hole or a cross-shaped hole, and solder is melted into the tin-conducting via, so that the pad has more tin-conducting channels under the same area, which is conducive to the solder to flow smoothly into the tin-conducting via, effectively avoiding the occurrence of cold soldering, insufficient soldering and other undesirable phenomena.

[0068] 8. The utility model provides a circuit board assembly, wherein the auxiliary input area is provided with at least one exhaust hole, and the exhaust hole passes through the auxiliary FPC. During welding, air is discharged through the exhaust hole, which can also speed up the flow of solder, ensure sufficient solder, effectively prevent cold solder joints, and make the welding performance stable and the product quality high.

[0069] 9. In the circuit board assembly provided by the utility model, a connection layer is provided between the wave absorbing layer of the main FPC and the partial area of ​​the wave absorbing layer of the auxiliary FPC. The connection layer is used to pre-fix the main FPC and the auxiliary FPC to ensure that the subsequent welding has high accuracy and precision and reduce the defect rate.

[0070] 10. The utility model provides a circuit board assembly, in which some areas between the main FPC and the auxiliary FPC are connected by welding points and a connection layer, and a gap structure is set between other areas. The gap structure helps to improve the good heat dissipation performance and prevent the circuit board assembly from overheating and affecting the working performance when the current is transmitted.

[0071] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A circuit board assembly, characterized in that: It includes a main FPC, an auxiliary FPC and a sensor module, wherein the main FPC and the auxiliary FPC are stacked, and a gap structure communicating with the outside is arranged between the two, the sensor module is mounted on the auxiliary FPC and electrically connected to the auxiliary FPC, and an absorbing layer is arranged between the main FPC and the auxiliary FPC; The main FPC is provided with a main output area, and the auxiliary FPC is provided with an auxiliary input area. The main output area is provided with a main output pad connected to the main FPC circuit, and the auxiliary input area is provided with an auxiliary input pad connected to the auxiliary FPC circuit and corresponding to the main output pad; the main output pad is cooperatively connected with the auxiliary input pad.

2. A circuit board assembly as claimed in claim 1, characterized in that: The sensor module and the corresponding auxiliary input area are respectively located at two ends of the auxiliary FPC, and the sensor module is electrically connected to the auxiliary input pad.

3. A circuit board assembly as claimed in claim 1, characterized in that: A connecting piece is provided on the main FPC, and the connecting piece is connected to the main FPC and conducts electricity to the main FPC.

4. A circuit board assembly as claimed in claim 1, characterized in that: The main output pads and the auxiliary input pads are distributed in a two-dimensional matrix on the corresponding main output area and auxiliary input area.

5. A circuit board assembly as claimed in claim 1, characterized in that: Main output test pads are evenly arranged at the edge of the main output area, and auxiliary input test pads corresponding to the main output test pads are arranged at the edge of the auxiliary input area. The main output test pads are cooperatively connected with the auxiliary input test pads.

6. A circuit board assembly as claimed in claim 5, characterized in that: The auxiliary input pad is provided with a tin-conducting via hole, through which the main output pad and the auxiliary input pad are welded; the auxiliary input test pad is provided with the tin-conducting via hole, through which the main output test pad and the auxiliary input test pad are welded.

7. A circuit board assembly as claimed in claim 6, characterized in that: The tin-conducting via hole is an elliptical hole or a cross-shaped hole, and solder is melted into the tin-conducting via hole.

8. A circuit board assembly as claimed in claim 1, characterized in that: At least one exhaust hole is disposed on the auxiliary input area, and the exhaust hole passes through the auxiliary FPC.

9. A circuit board assembly as claimed in claim 1, characterized in that: A connection layer is provided between a portion of the wave absorbing layer of the main FPC and the wave absorbing layer of the auxiliary FPC.

10. A circuit board assembly as claimed in claim 9, characterized in that: Part of the area between the main FPC and the auxiliary FPC is connected via welding points and a connection layer, and a gap structure is provided between other areas.

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