Film heating device and electric heater for electric automobile

Abstract

The utility model relates to an electric heater, in particular to a film heating device and an electric heater for an electric automobile. A film heating device includes: an electric heating plate including a heating substrate and an electric heating film disposed on the heating substrate; and the heating fins are arranged on one side or two sides of the electric heating plate so as to dissipate heat generated by the electric heating film. According to the film heating device provided by the utility model, the electric heating plate of the electric heating film is adopted for heating, heat dissipation is carried out through the heating fins, and the film heating device is compact in overall structure, stable in heating, high in heating speed and long in service life.

Description

Technical Field

[0001] This utility model relates to an electric heater, and more particularly to a membrane heating device and an electric heater for electric vehicles. Background Technology

[0002] Electric vehicles often use PTC heating for their air conditioning heating system, defrosting system, and battery heating and insulation system. PTC heating has advantages such as high safety and self-limiting temperature. However, PTC heating is not efficient enough in low-temperature environments, and PTC heaters are heavy and bulky. PTC heating has a slow start-up speed, and its power drops sharply in high-temperature areas (>80℃), making it difficult to meet the needs of rapid windshield defrosting. Utility Model Content

[0003] To solve the above problems, this utility model provides a membrane heating device, the specific technical solution of which is as follows:

[0004] A membrane heating device includes: an electric heating plate, comprising a heating substrate and an electric heating film disposed on the heating substrate; and heating fins disposed on one or both sides of the electric heating plate to dissipate the heat generated by the electric heating film.

[0005] Preferably, the membrane heating device further includes: a finned substrate, one end of the heating fin is disposed on the finned substrate, and the finned substrate is disposed on one or both sides of the electric heating plate.

[0006] Furthermore, the finned substrate is U-shaped.

[0007] Furthermore, the membrane heating device also includes a connecting substrate, which is disposed at the other end of the heating fin.

[0008] Preferably, there are two electric heating films, which are respectively disposed at both ends of the heating substrate.

[0009] Preferably, the electric heating film includes an encapsulation insulating layer, a heating resistance layer, and a bottom insulating layer arranged sequentially from top to bottom, and a conductor layer disposed between the encapsulation insulating layer and the bottom insulating layer and connected to the heating resistance layer, wherein the bottom insulating layer is disposed on the heating substrate.

[0010] An electric heater for an electric vehicle includes: a membrane heating device; a mounting frame, wherein the membrane heating device is disposed within the mounting frame; a mounting base, wherein the mounting frame is disposed on the mounting base; and a controller, wherein the controller is disposed within the mounting base and is electrically connected to the electric heating membrane on the electric heating plate.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] The membrane heating device provided by this utility model uses an electric heating plate with an electric heating membrane for heating and heat dissipation through heating fins. The overall structure is compact, the heating is stable, the heating speed is fast, and the service life is long. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the membrane heating device;

[0014] Figure 2 This is a front view of the membrane heating device;

[0015] Figure 3 This is a schematic diagram of the heating substrate structure;

[0016] Figure 4 This is a front view of the heating substrate;

[0017] Figure 5 This is a schematic diagram of the structure of an electric heater used in electric vehicles;

[0018] Figure 6 This is a front view of an electric heater used in electric vehicles. Detailed Implementation

[0019] The present invention will now be further described with reference to the accompanying drawings.

[0020] like Figures 1 to 4 As shown, a membrane heating device includes an electric heating plate 1 and heating fins 3. The electric heating plate 1 includes a heating substrate 11 and an electric heating film 12 disposed on the heating substrate 11. The heating fins 3 are installed on one or both sides of the electric heating plate 1 to dissipate the heat generated by the electric heating film 12.

[0021] The electric heating film 12 is a metal heating film layer. The electric heating film 12 includes, from top to bottom, an encapsulating insulating layer, a heating resistance layer 122, and a bottom insulating layer 121, and a conductor layer 123 disposed between the encapsulating insulating layer and the bottom insulating layer 121 and connected to the heating resistance layer 122. The bottom insulating layer 121 is disposed on the heating substrate 11. The heating resistance layer is made of conductive paste, and the electric heating film is manufactured using a non-co-fired process. The conductive paste generates heat directly through the Joule effect, achieving an energy conversion efficiency of over 95%, while PTC's is approximately 80-85%. The conductive paste is uniformly coated, avoiding localized high temperatures caused by poor contact in the PTC ceramic sheet. Existing PTC start-up times require over 30 seconds, while the electric heating plate 1 has a start-up speed of 3-5 seconds, resulting in a faster start-up speed.

[0022] The encapsulating insulating layer can be made of ceramic material and sintered at high temperature to protect the conductive circuit from scratches and impacts. The heating resistor layer is made of precious metals such as ruthenium and its oxides and is sintered at high temperature to generate heat when electricity is applied. The heating resistor layer can achieve high-power heating. The conductor layer is made of precious metals such as silver, palladium, and platinum and is sintered at high temperature. It has low resistivity and does not generate heat, and is used to connect the heating resistor and provide external input solder joints. The bottom insulating layer is made of ceramic material and is sintered at high temperature to act as an insulating medium between the heating resistor and the electric heating substrate 55 to ensure basic insulation. The heating substrate 11 is made of stainless steel plates such as SUS430, SUS444, and SUS445 and is used to support the electric heating film 12.

[0023] To facilitate production and assembly, the membrane heating device also includes a finned substrate 2. One end of the heating fin 3 is disposed on the finned substrate 2, and the heating fin 3 is fixed to the electric heating plate 1 via the finned substrate 2. The finned substrate 2 is conveniently fixed to the electric heating plate 1, making the fixing of the heating fin 3 simpler, improving production efficiency, and making the heating fin 3 less prone to deformation.

[0024] To further protect the heating fins 3 at both ends, the fin substrate 2 is U-shaped, and the heating fins 3 are located inside the fin substrate 2.

[0025] To facilitate the installation of adjacent membrane heating device arrays and improve the strength of the membrane heating device, further protecting the heating fins 3, a connecting substrate 4 is also included. The connecting substrate 4 is located at the other end of the heating fins 3 and connects to the U-shaped fin substrate 2 to form a fin frame, which wraps the heating fins 3 inside. This effectively prevents the heating fins 3 from being deformed by stress during turnover and assembly with the electric heating plate 1. After assembly, the heating fins 3 can maintain their position well, increasing their strength and adapting to the complex working conditions of automobiles, thus improving reliability and stability.

[0026] Two electric heating films 12 are provided, and they are respectively located at both ends of the heating substrate 11. By providing two electric heating films 12 on the heating substrate 11, the reliability can be effectively improved. When a fault occurs inside one of the electric heating films 12, the entire film heating device will not fail.

[0027] like Figure 5 and Figure 6 As shown, an electric heater for an electric vehicle includes a membrane heating device, a mounting frame 51, a mounting base 55, and a controller. The mounting frame 51 is a rectangular frame and is mounted on the mounting base 55. The membrane heating devices are installed inside the mounting frame 51 and arranged in an array to form a heater. The controller is installed inside the mounting base 55 and is electrically connected to the membrane heating devices.

[0028] The top and bottom of the mounting bracket 51 are provided with slots, and the slots are provided with elastic conductive sheets. The conductive sheets are connected to the controller through wires. The two ends of the electric heating plate 1 are respectively inserted into the slots at the top and bottom of the mounting bracket 51. The positive and negative leads of the electric heating film 12 are in contact with the conductive sheets, so as to realize the conduction between the electric heating film 12 and the controller.

[0029] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without inventive effort, and these embodiments will all fall within the protection scope of the claims of this utility model.

Claims

1. A film heating device, characterized by, include: An electric heating plate (1) includes a heating substrate (11) and an electric heating film (12) disposed on the heating substrate (11); as well as Heating fins (3) are provided on one or both sides of the electric heating plate (1) so that the heat generated by the electric heating film (12) can be dissipated.

2. A film heating apparatus according to claim 1, wherein The membrane heating device further includes a finned substrate (2), one end of the heating fin (3) is disposed on the finned substrate (2), and the finned substrate (2) is disposed on one or both sides of the electric heating plate (1).

3. A film heating device according to claim 2, wherein The finned substrate (2) is U-shaped.

4. A film heating apparatus according to claim 2, wherein The membrane heating device further includes a connecting substrate (4), which is disposed at the other end of the heating fin (3).

5. The film heating apparatus of claim 1, wherein Two electric heating films (12) are provided, and are respectively located at both ends of the heating substrate (11).

6. The film heating apparatus of claim 1, wherein The electric heating film (12) includes an encapsulation insulating layer, a heating resistance layer (122) and a bottom insulating layer (121) arranged sequentially from top to bottom, and a conductor layer (123) disposed between the encapsulation insulating layer and the bottom insulating layer (121) and connected to the heating resistance layer (122). The bottom insulating layer (121) is disposed on the heating substrate (11).

7. An electric heater for an electric vehicle, characterized by include: A membrane heating device as described in claim 1; The fixing frame (51) is provided inside the film heating device; A fixed base (55), wherein the fixed bracket (51) is disposed on the fixed base (55); and The controller is located inside the fixed base (55) and is electrically connected to the electric heating film (12) on the electric heating plate (1).

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