Motor controller box body with anti-condensation function

Abstract

The utility model relates to a motor controller box body with an anti-condensation function, comprising a box body upper cover and a box body tray, the inner surface of the box body upper cover is coated with a heat insulation anti-condensation coating, and the right side wall of the box body tray is fixedly provided with a ventilation balance valve. Reversible humidity adjusting pieces are bonded to the inner wall of the left side and the inner wall of the rear side of the box body tray correspondingly, and electronic components are fixedly installed in the box body tray. According to the motor controller box body with the anti-condensation function, on one hand, the relative humidity of air in a motor controller is adjusted through the reversible humidity adjusting sheet adhered to the inner wall of the box body tray, so that the air humidity in the controller is prevented from being too high; on the other hand, the temperature difference between the inner surface of the upper cover of the motor controller and the air in the motor controller is reduced by utilizing the heat-insulating anti-condensation coating sprayed on the inner side of the upper cover of the box body, and the humidity and the temperature in the motor controller are adjusted through the combined use of the two passive materials, so that the purpose of preventing condensation in the box body of the motor controller is achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of motor controllers for new energy electric vehicles, in particular to a motor controller box with an anti-condensation function. Background Art

[0002] The motor controller of new energy electric vehicles is a key electronic control device. The main function of the motor controller of electric vehicles is to adjust the speed and torque of the motor to realize the acceleration, deceleration, driving and parking of the vehicle. By controlling the working mode of the motor, the motor controller can improve the performance and efficiency of electric vehicles. During the use of the motor controller of new energy vehicles, water vapor in the external air can enter the motor controller. At the same time, when the electronic components are working, a large amount of heat will be generated, causing the air temperature inside the motor controller to be high. The inner wall and cover of the motor controller box are in contact with the external environment, and the temperature is generally lower than the temperature of the internal air, resulting in the existence of temperature difference. If the relative humidity of the air inside the motor controller is high, the water vapor in the internal air may condense into water droplets on the cold surface, such as the inner wall of the box, the inner wall of the cover, and the surface of the electrical connector. The condensation inside the motor controller will corrode the metal components inside the box, causing the circuit board to short-circuit, and even cause fire or explosion in severe cases. Therefore, for the motor controller of new energy electric vehicles, necessary protective measures must be taken to reduce the harm caused by condensation.

[0003] After searching, the anti-condensation method and device of the motor controller with Chinese patent number CN116353347A introduces the dry airflow generated by the air conditioner in the car to dehumidify the inside of the motor controller. Another example is an anti-condensation motor controller with Chinese patent number CN219108099U, which uses a heating resistor to evenly heat the internal environment. The main problem with the above active anti-condensation technology is that the system will generate additional energy consumption, reducing the vehicle's cruising range. The active anti-condensation method relies on an external power supply. Once a circuit failure occurs, the anti-condensation system will be at risk of failure.

[0004] In addition, passive anti-condensation technology does not use external energy or power supply, but relies on the material itself to adjust humidity and temperature to achieve the purpose of anti-condensation. The existing technology mainly uses desiccants. For example, China Patent No. CN109429445A is a waterproof and breathable device and a motor controller containing the same. The device uses a desiccant to dehumidify the gas entering the motor controller through a breathable balance valve. Then, the actual application of the desiccant in the motor controller scenario is not good, mainly because the desiccant only has the ability to absorb moisture, and it will become saturated after absorbing water. It cannot be used for a long time and needs to be replaced regularly. The motor controller is often integrated in an all-in-one electric drive system and cannot be opened and replaced during normal use. Therefore, the desiccant does not meet the application requirements of new energy vehicles. Therefore, a motor controller box with an anti-condensation function is proposed to solve the above problems. Utility Model Content

[0005] 1. Technical issues to be solved

[0006] In view of the deficiencies in the prior art, the utility model provides a motor controller box with an anti-condensation function, which has the advantages of preventing condensation by utilizing passive anti-condensation materials with reversible moisture absorption and release, and solves the problems of high energy consumption and poor reliability of active anti-condensation technology, and the existing passive anti-condensation technology mainly refers to the use of desiccant, which has only the ability to absorb moisture. Once a certain amount of moisture is absorbed, it will reach a moisture absorption saturation state and needs to be replaced or refilled, and cannot be used for a long time and needs to be replaced regularly.

[0007] (II) Technical solution

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a motor controller box with anti-condensation function, comprising a box cover and a box tray, the inner surface of the box cover is coated with a heat-insulating anti-condensation coating, a breathable balancing valve is fixedly installed on the right side wall of the box tray, and a reversible humidity-regulating sheet is bonded to the left inner wall and the rear inner wall of the box tray, and electronic components are fixedly installed inside the box tray.

[0009] Furthermore, the number of the reversible humidity-conditioning sheets is four, and the four reversible humidity-conditioning sheets are respectively located on the left inner wall and the rear inner wall of the box tray.

[0010] Furthermore, the reversible humidity-conditioning sheet is bonded to the side wall of the box pallet by means of adhesive backing, and the adhesive backing is an acrylic double-sided adhesive tape, and the actual peeling strength of the adhesive backing is ≥4N / cm.

[0011] Furthermore, the coating thickness of the heat-insulating anti-condensation coating is 1.0 mm-1.5 mm, and the size of the reversible humidity-regulating sheet is 140*50*3 mm.

[0012] (III) Beneficial effects

[0013] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0014] 1. The motor controller box with anti-condensation function is provided with a reversible humidity-regulating sheet, which can absorb and release moisture to maintain the air humidity inside the motor controller box within a controllable range. Compared with the use of desiccant, the effect lasts longer and does not need to be replaced regularly. Secondly, the air humidity can be precisely controlled to prevent condensation caused by excessive relative humidity inside the box.

[0015] 2. The motor controller box with anti-condensation function can reduce the heat transfer between the box cover and the external environment by spraying heat-insulating anti-condensation paint on the inner side of the motor controller box cover and utilizing hollow glass beads added inside the heat-insulating anti-condensation paint, so that the temperature of the inner surface of the box cover is close to the air temperature inside the motor controller, thereby reducing the risk of water vapor in the air inside the box condensing into liquid water on the inner surface of the box cover.

[0016] 3. The motor controller box with anti-condensation function adopts reversible humidity-regulating sheets and heat-insulating anti-condensation coatings, which are passive anti-condensation materials. Compared with active anti-condensation technology, they can save energy and help improve the vehicle's range. At the same time, since passive anti-condensation materials do not rely on power supply, they are simpler and more stable, and the anti-condensation function of the motor controller will not fail due to circuit failure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the explosion of the three-dimensional structure of the utility model.

[0018] In the figure: 1 box cover, 2 heat insulation and anti-condensation coating, 3 box tray, 4 breathable balancing valve, 5 reversible humidity control sheet, 6 electronic components. DETAILED DESCRIPTION

[0019] 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.

[0020] See also Figure 1In this embodiment, a motor controller box with anti-condensation function includes a box cover 1 and a box tray 3. The inner surface of the box cover 1 is coated with a heat-insulating anti-condensation coating 2. A breathable balancing valve 4 is fixedly installed on the right side wall of the box tray 3. A reversible humidity-regulating sheet 5 is adhered to the left inner wall and the rear inner wall of the box tray 3. Electronic components 6 are fixedly installed inside the box tray 3.

[0021] Specifically, the usage of the reversible humidity-conditioning sheet 5 can be calculated by the net volume of the motor controller case. The net volume of the case corresponding to an example of a motor controller case of the utility model is 34L. The size of the reversible humidity-conditioning sheet 5 is 140*50*3mm. The number of reversible humidity-conditioning sheets 5 is four. The four reversible humidity-conditioning sheets 5 are respectively located on the left inner wall and the rear inner wall of the case tray 3. The reversible humidity-conditioning sheet 5 is bonded to the side wall of the case tray 3 by means of adhesive backing, and the adhesive backing is an acrylic double-sided tape, and the actual peel strength of the adhesive backing is ≥4N / cm.

[0022] Furthermore, the humidity-controlling material inside the reversible humidity-controlling sheet 5 used in the utility model is a fiber substrate having a hydrophilic group, which is formed by coating the substrate with an organic / inorganic humidity-controlling composition. The reversible humidity-controlling sheet 5 can absorb and release moisture to maintain the ambient humidity within a controllable range, with a relative humidity of 50% RH to 60% RH, and a humidity control accuracy of ±5%.

[0023] Furthermore, under the conditions of a temperature of 45°C and a relative humidity of 95% RH, the moisture absorption rate of the reversible humidity regulating sheet 5 is ≥270%; under the conditions of a temperature of 45°C, from a relative humidity of 95% RH to a relative humidity of 60% RH, the moisture release rate of the reversible humidity regulating sheet 5 is ≥200%. The reversible humidity regulating sheet 5 can release moisture when the humidity increases and absorb moisture when the humidity decreases, thereby achieving long-term use without the need for regular replacement.

[0024] Specifically, the heat-insulating anti-condensation coating 2 is a water-based acrylic-based coating with ≥90% hollow glass beads added inside. It has good heat-insulating function and a thermal conductivity coefficient of 0.045W / mK, and can reduce heat transfer from the box cover 1 and the external environment of the motor controller box.

[0025] Furthermore, the thermal insulation and anti-condensation coating 2 can be sprayed on the inner side of the box cover 1 by manual spraying or automated spraying equipment. The coating thickness of the thermal insulation and anti-condensation coating 2 is 1.0mm-1.5mm. After spraying, the box cover 1 is placed in an oven or tunnel furnace for high-temperature curing. The curing conditions are 70°C and the duration is 50 minutes.

[0026] During implementation, the following steps are followed: when the electronic components 6 inside the motor controller are working, a large amount of heat is generated, causing the air temperature inside the motor controller to rise. On the one hand, the relative humidity of the air inside the motor controller is adjusted by the reversible humidity-regulating sheet 5 bonded to the inner wall of the box tray 3 to prevent the air humidity inside the controller from being too high. On the other hand, the heat-insulating anti-condensation coating 2 sprayed on the inner side of the box cover 1 is used to reduce the temperature difference between the inner surface of the motor controller cover and the air inside the motor controller. By using the combination of two passive materials, the humidity and temperature inside the motor controller are regulated to prevent condensation from forming inside the motor controller box.

[0027] To sum up, the motor controller box with anti-condensation function is provided with a reversible humidity-regulating sheet 5. The reversible humidity-regulating sheet 5 can absorb and release moisture to maintain the air humidity inside the motor controller box within a controllable range. Compared with the use of desiccant, firstly, the effect lasts longer and does not need to be replaced regularly. Secondly, it can achieve precise control of the air humidity to prevent condensation caused by excessive relative humidity of the air inside the box.

[0028] Moreover, by spraying the thermal insulation and anti-condensation coating 2 on the inner side of the motor controller's box cover 1 and utilizing the hollow glass beads added inside the thermal insulation and anti-condensation coating 2, the heat transfer between the box cover 1 and the external environment can be reduced, so that the temperature of the inner surface of the box cover 1 is close to the air temperature inside the motor controller, thereby reducing the risk of water vapor in the air inside the box condensing into liquid water on the inner surface of the box cover 1.

[0029] In addition, the reversible humidity-regulating sheet 5 and the heat-insulating anti-condensation coating 2 adopted are both passive anti-condensation materials. Compared with active anti-condensation technology, they can save energy and help improve the vehicle's cruising range. At the same time, since passive anti-condensation materials do not rely on power supply, this means that they are simpler and more stable, and will not cause the anti-condensation function of the motor controller to fail due to circuit failure. This solves the problem of high energy consumption and poor reliability of active anti-condensation technology. In addition, the existing passive anti-condensation technology mainly refers to the use of desiccant, which only has the ability to absorb moisture. Once it absorbs a certain amount of moisture, it will reach a moisture absorption saturation state and need to be replaced or refilled. It cannot be used for a long time and needs to be replaced regularly.

[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 motor controller box with an anti-condensation function, comprising a box cover (1) and a box tray (3), characterized in that: The inner surface of the box upper cover (1) is coated with a heat-insulating anti-condensation coating (2); a breathable balancing valve (4) is fixedly installed on the right side wall of the box tray (3); a reversible humidity-regulating sheet (5) is bonded to the left inner wall and the rear inner wall of the box tray (3); and electronic components (6) are fixedly installed inside the box tray (3).

2. The motor controller box with anti-condensation function according to claim 1, characterized in that: The number of the reversible humidity-conditioning sheets (5) is four, and the four reversible humidity-conditioning sheets (5) are respectively located on the left inner wall and the rear inner wall of the box tray (3).

3. The motor controller box with anti-condensation function according to claim 1, characterized in that: The reversible humidity-conditioning sheet (5) is bonded to the side wall of the box tray (3) by means of adhesive backing, and the adhesive backing is an acrylic double-sided adhesive tape, and the actual peeling strength of the adhesive backing is ≥4N / cm.

4. The motor controller box with anti-condensation function according to claim 1, characterized in that: The coating thickness of the heat-insulating anti-condensation coating (2) is 1.0 mm-1.5 mm, and the size of the reversible humidity-conditioning sheet (5) is 140*50*3 mm.

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