A hydronic film heater assembly

Abstract

The utility model discloses a kind of water heating film heater assembly.It includes shell and film heating sheet;Shell includes control layer, upper flow passage layer and lower flow passage layer connected in turn;Film heating sheet is set between upper flow passage layer and lower flow passage layer, including upper PI insulating layer and lower PI insulating layer, and silver alloy conductive layer and graphene resistance heating layer located therebetween;Silver alloy conductive layer is silk-screened on lower PI insulating layer, and graphene resistance heating layer is silk-screened on silver alloy conductive layer;Two electrodes of silver alloy conductive layer are connected with copper bar.Occupational advantage is: the following PI insulating layer itself replaces heavy base plate as silk-screening carrier, so that the overall weight of core body is greatly reduced, and at the same time, since each layer is very thin, the heat dissipation area ratio of core body is larger, and the heat dissipation effect is better;Use silver alloy as conductive layer, with strong oxidation resistance, good conductivity, high stability and long service life;Use graphene as resistance heating layer, with high thermal energy conversion efficiency, fast temperature rise, uniform heating and environmental protection and energy saving.

Description

Technical Field

[0001] This utility model relates to a new energy vehicle heater, specifically a water-heating film heater assembly. Background Technology

[0002] Currently, the vehicle heaters used in new energy vehicles on the market are mainly thick-film heaters and PTC heaters. Thick-film heating technology typically uses ceramic or stainless steel as a substrate, on which insulating, heating, and conductive layers are printed using screen printing, requiring high-temperature sintering during the screen printing process. PTC heaters mainly consist of PTC ceramic sheets, electrodes, PI insulating film, aluminum tubes, and heat sinks. However, with the continuous development and upgrading of new energy vehicles, these two types of heavy heating cores are finding it difficult to meet the requirements for lightweight design. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a water heating film heater assembly with good heat dissipation effect and light weight.

[0004] To solve the above-mentioned technical problems, the present invention provides a water-heating film heater assembly, comprising a housing and a film heating element; the housing comprises a control layer, an upper flow channel layer, and a lower flow channel layer connected in sequence; the film heating element is disposed between the upper flow channel layer and the lower flow channel layer, comprising an upper PI insulating layer and a lower PI insulating layer, and a silver alloy conductive layer and a graphene resistive heating layer located therebetween; the silver alloy conductive layer is screen-printed on the lower PI insulating layer, and the graphene resistive heating layer is screen-printed on the silver alloy conductive layer; copper busbars are connected to the two electrodes of the silver alloy conductive layer.

[0005] The control layer includes a PCBA controller for controlling the heating power of the film heating element, and an upper cover plate is provided above it; the copper busbar is connected to the PCBA controller.

[0006] Both the upper part of the upper flow channel layer and the lower part of the lower flow channel layer are formed by die casting, resulting in multiple parallel flow channels that are interconnected.

[0007] The lower flow channel layer is provided with an inlet and an outlet on its side.

[0008] The bottom of the control layer is equipped with an NTC temperature sensor for collecting the water temperature at the inlet and outlet.

[0009] A lower cover plate is provided below the lower flow channel layer.

[0010] The advantages of this invention are: compared with thick film heaters, the lower PI insulating layer itself replaces the heavy substrate as the screen printing carrier, which greatly reduces the overall weight of the core. At the same time, since each layer is extremely thin, the heat dissipation area of ​​the core is larger and the heat dissipation effect is better. The use of silver alloy as the conductive layer has strong oxidation resistance, good conductivity, high stability and long service life. The use of graphene as the resistive heating layer has high thermal energy conversion efficiency, fast heating, uniform heating and environmental protection and energy saving. Attached Figure Description

[0011] Figure 1 This is an exploded view of the present invention; Figure 2 This is an exploded view of the film heating element of this utility model. Detailed Implementation

[0012] The water heating film heater assembly of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0013] like Figure 1 As shown, the water heating film heater assembly of this utility model includes a housing and a film heating element 2; the housing includes a control layer 3, an upper flow channel layer 4 and a lower flow channel layer 5 connected in sequence; the film heating element 2 is disposed between the upper flow channel layer 4 and the lower flow channel layer 5.

[0014] The control layer 3 is equipped with a PCBA controller 11 for controlling the heating power of the membrane heating element, and an upper cover plate 12 is installed above it. The upper part of the upper flow channel layer 4 and the lower part of the lower flow channel layer 5 are both formed by die casting, resulting in multiple parallel flow channels that are interconnected. The lower flow channel layer 5 has an inlet 13 and an outlet 14 on its side, and a lower cover plate 16 at its bottom. High and low pressure connectors are arranged on the control layer 3, and an NTC temperature sensor 15 is installed at the bottom to collect the water temperature at the inlet 13 and outlet 14.

[0015] like Figure 2 As shown, the film heating element 2 includes an upper PI insulating layer 6 and a lower PI insulating layer 7, as well as a silver alloy conductive layer 8 and a graphene resistive heating layer 9 located therebetween; the silver alloy conductive layer 8 is screen-printed on the lower PI insulating layer 7, and the graphene resistive heating layer 9 is screen-printed on the silver alloy conductive layer 8; copper busbars 10 are connected to the two electrodes of the silver alloy conductive layer 8, and the film heating element 2 is connected to the PCBA controller 11 through the copper busbars 10.

[0016] During production, a silver alloy conductive layer 8 is first screen-printed onto the lower PI insulating layer 7. After curing, a graphene resistive heating layer 9 is screen-printed, and after curing again, the upper PI insulating layer 6 is attached to form the film heating element 2. The thicknesses of the upper PI insulating layer 6 and the lower PI insulating layer 7 are 0.05-0.3 mm, the thickness of the silver alloy conductive layer 8 is 10-50 μm, and the thickness of the graphene resistive heating layer 9 is 10-100 μm. The PCBA controller 11 is installed in the control layer 3, and the NTC temperature sensor 15 is installed below the control layer 3. Then, the control layer 3, the upper flow channel layer 4, the film heating element 2, and the lower flow channel layer 5 are connected in sequence. Finally, the upper cover plate 12 is installed above the control layer 3, and the lower cover plate 16 is installed below the lower flow channel layer 5 to complete the assembly. The joints of each part are sealed using sealing rings, sealant, or friction stir welding. In use, water is injected into the flow channel, and the power of the membrane heating element 2 is controlled by the PCBA controller 11. The membrane heating element 2 exchanges heat with the upper and lower flow channels to heat the water, thereby achieving the purpose of heating the whole vehicle.

[0017] Of course, the above description is not intended to limit the present utility model, and the present utility model is not limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present utility model should also fall within the protection scope of the present utility model.

Claims

1. A water heating film heater assembly, comprising a housing and a film heating element (2), characterized in that: The housing includes a control layer (3), an upper flow channel layer (4), and a lower flow channel layer (5) connected in sequence; the film heating element (2) is disposed between the upper flow channel layer (4) and the lower flow channel layer (5), including an upper PI insulating layer (6) and a lower PI insulating layer (7), and a silver alloy conductive layer (8) and a graphene resistive heating layer (9) located therebetween; the silver alloy conductive layer (8) is screen-printed on the lower PI insulating layer (7), and the graphene resistive heating layer (9) is screen-printed on the silver alloy conductive layer (8); copper busbars (10) are connected to the two electrodes of the silver alloy conductive layer (8).

2. The water heating film heater assembly according to claim 1, characterized in that: The control layer (3) is provided with a PCBA controller (11) for controlling the heating power of the film heating element, and an upper cover plate (12) is provided above it; the copper busbar (10) and the PCBA controller (11) are connected.

3. The water heating film heater assembly according to claim 2, characterized in that: The upper part of the upper flow channel layer (4) and the lower part of the lower flow channel layer (5) are both formed by die casting to form multiple parallel flow channels, and the upper and lower flow channels are interconnected.

4. The water heating film heater assembly according to claim 3, characterized in that: The lower flow channel layer (5) is provided with an inlet (13) and an outlet (14) on its side.

5. The water heating film heater assembly according to claim 4, characterized in that: The bottom of the control layer (3) is provided with an NTC temperature sensor (15) for collecting the water temperature at the inlet (13) and outlet (14).

6. The water heating film heater assembly according to any one of claims 1-5, characterized in that: A lower cover plate (16) is provided below the lower flow channel layer (5).

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