Waterproof circuit board
By setting up a packaging layer, airbag and water-absorbing layer on the circuit board of the automotive electronic control unit to form a sealing structure, the problem of leakage of circuit board due to water vapor infiltration is solved, and the drying of circuits and the stable operation of equipment is achieved.
Patent Information
- Application Number
- CN202420290452.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-08
- Publication Date
- 2025-03-21
- Estimated Expiration
- 2034-02-08
AI Technical Summary
The circuit boards in the automotive electronic control unit are prone to leakage due to water vapor infiltration, which in turn affects the normal operation and driving safety of the vehicle.
A waterproof circuit board is designed, by providing a packaging layer around the electronic control unit, and an air bag and a water absorbing layer that can be filled and deflated in the joint hole, forming a sealing structure to prevent water vapor and liquid from entering.
It effectively isolates water vapor, prevents leakage, ensures dryness at the circuit joints, avoids short circuits and equipment damage, and improves the mechanical strength and corrosion resistance of the electronic control unit.
Smart Images
Figure CN222655438U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of automobile electronic control unit devices, in particular to a waterproof circuit board. Background Art
[0002] Various circuit boards are used in cars, and these circuit boards play an important role in various parts of the car. The following are some of the main circuit board applications. The power system control board is responsible for controlling the start, run and stop of the engine, as well as monitoring various parameters of the engine. It ensures the power output and fuel efficiency of the car. The charging control board is responsible for managing the charging and discharging process of the battery to ensure the safety and effective operation of the battery. The dashboard is the main interface for the driver to interact with the vehicle. It contains various instruments and indicator lights, such as the speedometer, tachometer, water temperature gauge, etc., to help the driver understand the operating status of the vehicle. The safety system control board is responsible for monitoring the operating status of the vehicle, such as the anti-lock braking system (ABS), electronic stability control system (ESP), etc., to ensure the safety of the driver and passengers.
[0003] The electronic control unit (ECU) is an integrated control device for the engine. Its function is to calculate, process, judge, and output instructions for various information input by the engine sensors according to its own stored programs, and then control the actions of related actuators to achieve the purpose of fast, accurate, and automatic control of the engine. The electronic control unit contains a circuit board and is wrapped by a metal shell on the outside. One layer is equipped with a wire interface for connecting the supply and demand control equipment. Because the wire interface is exposed to the air, it is easy to leak electricity when it encounters water. Leakage of the automotive electronic control unit may have the following consequences: If the power line or ground line of the electronic control unit leaks electricity, the vehicle may not be able to start. When the internal circuit of the ECU leaks electricity, the fault light may light up to prompt the driver that there is a fault in the vehicle. If the ECU leakage causes insufficient power supply, the performance of the vehicle may be affected, such as slow acceleration and increased fuel consumption. If the leakage of the electronic control unit causes abnormal control signals, the vehicle may be out of control, such as failure to shift gears or brake normally. Leakage of the electronic control unit will seriously affect the safety of the driver, so not only the entire circuit board should be waterproofed, but also the line interface should be waterproofed to prevent leakage. Utility Model Content
[0004] 1. Technical issues to be resolved
[0005] In view of the deficiencies in the prior art, the utility model provides a waterproof circuit board, which has the advantages of isolating water vapor and preventing leakage, and solves the problem of automobile circuit boards.
[0006] (II) Technical solution
[0007] In order to achieve the above-mentioned purpose of isolating water vapor and preventing leakage, the utility model provides the following technical solutions: a waterproof circuit board, including an upper cover plate, a lower cover plate and an electronic control unit, the electronic control unit is fixed on the lower cover plate by a low-temperature welding tape, and a welding layer is formed between them, and the circuit connector on one side of the electronic control unit is aligned with the connector hole on one side of the lower cover plate, the upper cover plate is provided with a notch of the same size as the electronic control unit, and after the connector hole of the upper cover plate is aligned with the connector hole of the lower cover plate, the upper cover plate and the lower cover plate are bonded and sealed with a sealant, and an airbag that can be inflated and deflated is provided on the upper and lower sides of the connector hole, and the airbag can be squeezed against each other after being filled with air.
[0008] Preferably, a water-absorbing layer capable of absorbing water vapor is provided on the outside of the airbag to prevent water vapor from entering. After absorbing a certain amount of water vapor, the water can be squeezed out by the mutual squeezing between the airbags to ensure the dryness of the circuit joints and avoid short circuit caused by contact with liquid, which may cause damage to the equipment.
[0009] Preferably, the connector hole has a small inner diameter and a large outer diameter, so that the inner surface is an inclined surface, so that the water squeezed out of the water absorbing layer or the liquid accumulated at the connector hole can flow out along the inclined surface to avoid entering the internal circuit connection and causing leakage.
[0010] Preferably, the electronic control unit is wrapped with a packaging layer formed by a packaging material, and the packaging layer is made of metal aluminum foil or metal copper foil. The metal material has high mechanical strength, can effectively protect the edge of the electronic control unit, and prevent damage by external forces during transportation, installation and use. It has good corrosion resistance and can adapt to various environmental conditions to ensure the long-term stable operation of the electronic control unit. It has good thermal stability and can maintain stable performance in an environment with large temperature changes. The metal material is easy to be processed into various shapes and sizes, and can meet the packaging requirements of different types of electronic control units.
[0011] Preferably, a silicone layer formed by injected silicone fills the gap between the packaging layer and the inner sides of the upper cover plate and the lower cover plate, so that the shaking of the electronic control unit caused by vibration during driving of the car can be avoided. Reducing the shaking can effectively avoid the stability of the circuit joint connection and prevent water vapor from entering, thereby achieving complete isolation from water vapor.
[0012] Preferably, polyurethane coating is sprayed on the notch above the upper cover plate and on the upper surface of the electronic control unit exposed at the notch to form a coating. Since the electronic control unit is wrapped by a metal shell, this coating has the characteristics of hardness, good weather resistance, wear resistance, UV resistance, and chemical corrosion resistance. It is suitable for metal surfaces, ensures waterproofness, and can accelerate heat dissipation, so that the electronic control unit can work at a suitable temperature.
[0013] (III) Beneficial effects
[0014] Compared with the prior art, the utility model provides a waterproof circuit board, which has the following beneficial effects:
[0015] 1. The waterproof circuit board is provided with an airbag that can be inflated and deflated on the upper and lower sides of the joint hole. When the airbags are filled with air, they can squeeze each other to wrap the wires and seal the circuit joints and wire connections to prevent liquid from entering and causing a short circuit. A water-absorbing layer that can absorb water vapor is provided on the outside of the airbags to prevent water vapor from entering. After absorbing a certain amount of water vapor, the water can be squeezed out by mutual squeezing between the airbags to ensure the dryness of the circuit joints and avoid short circuits caused by contact with liquids and damage to the equipment. The joint hole has a small internal diameter and a large external diameter, so that the inner surface is an inclined surface, so that the water squeezed out of the water-absorbing layer or the liquid accumulated at the joint hole can flow out along the inclined surface to avoid entering the internal circuit connection and causing leakage.
[0016] 2. The waterproof circuit board has a packaging layer formed by wrapping a packaging material around the electronic control unit. The packaging layer is made of metal aluminum foil or metal copper foil. The metal material has high mechanical strength, can effectively protect the edge of the electronic control unit, and prevent damage by external forces during transportation, installation and use. It has good corrosion resistance and can adapt to various environmental conditions to ensure the long-term stable operation of the electronic control unit. It has good thermal stability and can maintain stable performance in an environment with large temperature changes. The metal material is easy to be processed into various shapes and sizes to meet the packaging requirements of different types of electronic control units. The silicone layer formed by injected silicone fills the gap between the packaging layer and the inner sides of the upper cover plate and the lower cover plate, so that when the car is driving, the vibration that causes the electronic control unit to shake can be avoided. Reducing shaking can effectively avoid the stability of the circuit joint connection and prevent water vapor from entering, thereby achieving complete isolation from water vapor. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the structure of the utility model;
[0018] Figure 2 This is a schematic diagram of the interior of the connector hole of the utility model;
[0019] Figure 3 This is a schematic diagram of the packaging of the electric control unit of the utility model;
[0020] Figure 4 This is a schematic diagram of the coating of the utility model.
[0021] In the figure: 2, electronic control unit; 11, upper cover; 12, lower cover; 13, airbag; 14, coating; 21, circuit connector; 22, silicone layer; 23, packaging layer; 24, welding layer; 101, connector hole; 131, water absorption layer. DETAILED DESCRIPTION
[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0023] See also Figure 1-2 A waterproof circuit board comprises an upper cover plate 11, a lower cover plate 12 and an electric control unit 2, wherein the electric control unit 2 is fixed to the lower cover plate 12 by a low-temperature welding tape, and a welding layer 24 is formed therebetween, and a circuit connector 21 on one side of the electric control unit 2 is aligned with a connector hole 101 on one side of the lower cover plate 12, and the upper cover plate 11 is provided with a notch of the same size as the electric control unit 2, which is convenient for the injection of silicone and the subsequent coating treatment, thereby ensuring the waterproofing and heat dissipation of the electric control unit 2, and after the connector hole 101 of the upper cover plate 11 is aligned with the connector hole 101 of the lower cover plate 12, the upper cover plate 11 and the lower cover plate 12 are bonded and sealed by a sealant, and an air bag 13 capable of being inflated and deflated is provided on the upper and lower sides of the connector hole 101, and the air bag 13 can be squeezed against each other after being filled with air, wrapping the wires, and sealing the circuit connector 21 and the wire connection to prevent liquid from entering and causing a short circuit.
[0024] The outside of the airbag 13 is provided with a water-absorbing layer 131 capable of absorbing water vapor to prevent water vapor from entering. After absorbing a certain amount of water vapor, the water can be squeezed out through the mutual squeezing between the airbags 13 to ensure the dryness of the circuit connector 21 and avoid short circuit caused by contact with liquid, which may cause damage to the equipment.
[0025] The connector hole 101 has a small inner diameter and a large outer diameter, so that the inner surface is an inclined surface, so that the water squeezed out of the water absorbing layer 131 or the liquid accumulated at the connector hole 101 can flow out along the inclined surface to avoid entering the internal circuit connection and causing leakage.
[0026] See also Figure 3 The electronic control unit 2 is wrapped with a packaging layer 23 formed by a packaging material. The packaging layer 23 is made of metal aluminum foil or metal copper foil. The metal material has high mechanical strength and can effectively protect the edge of the electronic control unit 2 to prevent damage by external forces during transportation, installation and use. It has good corrosion resistance and can adapt to various environmental conditions to ensure the long-term stable operation of the electronic control unit 2. It has good thermal stability and can maintain stable performance in an environment with large temperature changes. The metal material is easy to be processed into various shapes and sizes, which can meet the packaging requirements of different types of electronic control units 2.
[0027] The gap between the packaging layer 23 and the inner sides of the upper cover plate 11 and the lower cover plate 12 is filled with a silicone layer 22 formed by injected silicone, so that the shaking of the electronic control unit 2 caused by vibration during driving of the car can be avoided. Reducing the shaking can effectively avoid the stability of the connection of the circuit connector 21 and prevent water vapor from entering, thereby achieving complete isolation from water vapor.
[0028] See also Figure 4 The notch above the upper cover plate 11 and the upper surface of the electronic control unit 2 exposed at the notch are sprayed with polyurethane coating to form a coating 14. Because the electronic control unit 2 is wrapped by a metal shell, this coating has the characteristics of hardness, good weather resistance, wear resistance, UV resistance, chemical corrosion resistance, etc., and is suitable for metal surfaces. While ensuring waterproofness, it can accelerate heat dissipation, so that the electronic control unit can work at a suitable temperature.
[0029] Working principle: The welding layer 24 formed by the low-temperature welding tape is fixed on the lower cover plate 12 by the electric control unit 2, and the circuit connector 21 on one side of the electric control unit 2 is aligned with the connector hole 101 on one side of the lower cover plate 12, and then the surrounding of the electric control unit 2 is wrapped with edge sealing material to form a packaging layer 23, and the upper cover plate 11 is covered, and silicone is added to form a seal between the edge sealing material and the cover plate to prevent water vapor from entering from the gap between the upper and lower cover plates. A larger notch is provided above the upper cover plate 11 to facilitate the injection of silicone and the subsequent coating treatment. The coating 14 is formed at the notch of the upper cover plate 11 through the coating process to ensure the waterproofness and To dissipate heat, after the line to be connected is connected to the circuit connector 21 on the electronic control unit 2 through the connector hole 101, the airbag 13 in the connector hole 101 is inflated to expand it. After the upper and lower airbags 13 expand, they squeeze each other to wrap the wires and seal the circuit connector 21 and the wire connection to prevent liquid from entering and causing a short circuit. At the same time, a water absorption layer 131 is provided on the outside of the airbag 13 to prevent water vapor from entering. After absorbing a certain amount of water vapor, the water can be squeezed out by the mutual squeezing between the airbags 13 to ensure the dryness of the circuit connector 21 and avoid short circuit caused by contact with liquid, which may cause damage to the equipment.
[0030] It should be noted that, in this article, relational terms such as first and second, etc. 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 existence of other identical elements in the process, method, article or device including the elements.
[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A waterproof circuit board, comprising an upper cover plate (11), a lower cover plate (12) and an electronic control unit (2), characterized in that: The electric control unit (2) is fixed to the lower cover plate (12) by means of a low-temperature welding strip, and a welding layer (24) is formed therebetween. The circuit connector (21) on one side of the electric control unit (2) is aligned with the connector hole (101) on one side of the lower cover plate (12). The upper cover plate (11) is provided with a notch having a size consistent with that of the electric control unit (2). After the connector hole (101) of the upper cover plate (11) is aligned with the connector hole (101) of the lower cover plate (12), the upper cover plate (11) and the lower cover plate (12) are bonded and sealed by means of a sealant. An air bag (13) capable of being inflated and deflated is provided on the upper and lower sides of the connector hole (101). The air bags (13) can be squeezed against each other after being filled with air.
2. A waterproof circuit board according to claim 1, characterized in that: The outer side of the air bag (13) is provided with a water absorbing layer (131) capable of absorbing water vapor.
3. A waterproof circuit board according to claim 1, characterized in that: The joint hole (101) has a small inner diameter and a large outer diameter, so that the inner surface is an inclined surface.
4. A waterproof circuit board according to claim 1, characterized in that: The electronic control unit (2) is wrapped around a packaging layer (23) formed by a packaging material, and the packaging layer (23) is made of metal aluminum foil or metal copper foil.
5. A waterproof circuit board according to claim 4, characterized in that: The gap between the packaging layer (23) and the inner sides of the upper cover plate (11) and the lower cover plate (12) is filled with a silicone layer (22) formed by injected silicone.
6. A waterproof circuit board according to claim 1, characterized in that: Polyurethane coating is sprayed on the notch above the upper cover plate (11) and on the upper surface of the electric control unit (2) exposed at the notch to form a coating (14).