Electric heater and circulation chamber assembly thereof, and electric vehicle

Abstract

An electric heater and a circulation chamber assembly thereof, and an electric vehicle. The circulation chamber assembly (200) comprises a flow channel portion, two main flow channels, and a fin pressing plate (230). The flow channel portion comprises multiple fluid channels that are horizontally arranged; the two main flow channels are respectively arranged above two ends of the flow channel portion; the fin pressing plate (230) is arranged above the flow channel portion; and the edges of two sides of the fin pressing plate (230) extend into the main flow channels, so as to allow a fluid to bypass the edges of the two sides of the fin pressing plate (230) and flow between the main flow channels and the flow channel portion. In the circulation chamber assembly, under the action of the fin pressing plate, the fluid bypasses the edges of the fin pressing plate and flows between the main flow channels and the flow channel portion, so that the fluid can flow through the regions at two ends of the flow channel portion, increasing the heat exchange area, thereby improving the heat exchange efficiency.

Description

Electric heater and circulation chamber assembly thereof and electric vehicle Technical Field

[0001] The present application relates to the field of electric heating equipment, and more specifically, to an electric heater and a circulation chamber assembly thereof and an electric vehicle. Background Art

[0002] Existing new energy vehicles use a variety of types of electric heaters to meet their respective vehicle thermal management needs. Among them, film heaters using thin film and thick film technology have advantages over PTC heaters in power density, high heat exchange efficiency, and precise control of heating power. Affected by the heating element preparation process, a flat-plate structure is usually adopted, that is, a thin layer of heating elements is directly prepared at the bottom and / or top of the heater circulation cavity, resulting in a large horizontal projection area and a small thickness of the film heater. In addition, film heaters usually adopt a parallel and / or mutually isolated flow channel design, requiring a main channel to be responsible for distributing the cooling medium entering each flow channel, because there is no additional heat dissipation structure (such as heat dissipation columns / fins) in the main channel. The heating element cannot be set below the main channel, resulting in the horizontal projection area of ​​the film heater including not only the horizontal projection area of ​​the heating element, but also the horizontal projection area of ​​the main channel, resulting in a large horizontal projection area of ​​the film heater and a relatively low coverage rate of the heating element on its bearing surface. The above factors have a combined adverse effect on the heat exchange efficiency and total heat generation power of the electric heater.

[0003] Therefore, how to improve the heat exchange efficiency and total heating power under the premise of a smaller horizontal projected area becomes a technical problem that needs to be solved in this application.

[0004] Summary of the Invention

[0005] In view of this, the present application proposes an electric heater to improve heat exchange efficiency and total heating power under the premise of a smaller horizontal projected area.

[0006] The present application provides a circulation chamber assembly of an electric heater, wherein the circulation chamber assembly includes a flow channel portion, two main channels, and a fin pressure plate. The flow channel portion includes fins, and the fins define a plurality of fluid channels arranged horizontally. The two main channels are respectively arranged above the two ends of the flow channel portion. The fin pressure plate presses and positions the fins from above, and the two side edges of the fin pressure plate extend into the main channels to allow the fluid to bypass the two side edges of the fin pressure plate and flow between the main channels and the flow channel portion.

[0007] Optionally, the circulation chamber assembly includes two ports located on the same side of the flow channel portion, and the two main flow channels are respectively connected to the two ports.

[0008] Optionally: the flow cross-sections of the two main channels gradually decrease from the side where the port is located toward the other side of the flow channel portion; and / or the two main channels are symmetrically arranged about the center plane between the two ports.

[0009] Optionally, the edge of the fin pressing plate gradually retracts inward from the side where the port is located toward the other side of the flow channel portion.

[0010] Optionally, the edge of the fin pressure plate includes a first part capable of covering the end of the flow channel portion and a second part that keeps away from the end of the flow channel portion, and the first part is provided with a baffle portion extending vertically downward. Preferably, the vertical extension length of the baffle portion gradually decreases in the direction toward the second part; and / or, the width l of the second part gradually decreases in the direction away from the first part.

[0011] Optionally, the extension direction of the fluid channel is perpendicular to the extension direction of the main flow channel.

[0012] Optionally, the flow channel portion includes a fin, and the fin includes a plurality of corrugated fin portions. The plurality of fin portions are arranged side by side, and the corrugations of adjacent fin portions are arranged in a staggered manner.

[0013] Optionally, the circulation chamber assembly includes a bottom plate and a top cover, and the bottom plate, the fin pressing plate and the top cover together define the main flow channel and a space for arranging the flow channel portion.

[0014] Optionally: the base plate, fins, fin pressing plate and top cover are brazed and fixed; and / or, the top cover includes a first area defining the main channel, and the first area is provided with a first temperature sensing unit; and / or, the top cover includes a second area defining the space of the flow channel portion, and the second area is provided with a second temperature sensing unit.

[0015] The present application also provides an electric heater, wherein the electric heater includes the circulation chamber assembly of the electric heater of the present application.

[0016] Optionally, the electric heater includes a heating element corresponding to the flow channel portion and arranged below the circulation chamber assembly. Preferably, the horizontal projection of the flow channel portion on the arrangement plane of the fluid channel is located inside the horizontal projection of the heating element on the plane, and the edge of the horizontal projection of the main flow channel on the plane is located outside the horizontal projection of the heating element on the plane.

[0017] Optionally, the heating element is a film heating element, preferably a thin film heating element.

[0018] Optionally, the electric heater includes a PCB assembly and an electrode for connecting the connecting end of the heating element to the PCB assembly, one end of the electrode is fixed to the connecting end by bonding with conductive glue, and the PCB assembly is provided with a socket for plugging the other end of the electrode.

[0019] The present application also provides an electric vehicle, wherein the electric vehicle includes the electric heater of the present application.

[0020] According to the technical solution of the present application, the main channel is arranged above the two ends of the flow channel part. Under the action of the fin pressure plate, the fluid bypasses the edge of the fin pressure plate and flows between the main channel and the flow channel part, so that the fluid can flow through the two end areas of the flow channel part, increasing the heat exchange area and thus improving the heat exchange efficiency.

[0021] Other features and advantages of the present application will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The accompanying drawings, which constitute part of this application, are used to provide a further understanding of the application, and the exemplary embodiments of the application and their descriptions are used to explain the application. In the accompanying drawings:

[0023] FIG1 is an exploded perspective view of an electric heater according to an embodiment of the present application;

[0024] FIG2 is a perspective view of the circulation chamber assembly in FIG1 ;

[0025] FIG3 is a cross-sectional view of FIG2;

[0026] FIG4 is a partial enlarged view of FIG3;

[0027] FIG5 is a view of FIG2 with the top cover removed;

[0028] FIG6 is a view of the fin portion in FIG2;

[0029] FIG7 is a partial front view of FIG6;

[0030] FIG8 is a cross-sectional view of the heating element in FIG1;

[0031] FIG9 is a partially cutaway perspective view showing the electrode connection structure of the electric heater of FIG1 ;

[0032] FIG10 is a partially cutaway view showing the circulation chamber assembly of FIG2 ;

[0033] FIG. 11 is a top view illustrating a fin pressing plate according to another embodiment of the present application. DETAILED DESCRIPTION

[0034] The technical solution of the present application will be described in detail below with reference to the accompanying drawings and in combination with the implementation methods.

[0035] According to one aspect of the present application, a circulation chamber assembly of an electric heater is provided, wherein the circulation chamber assembly 200 includes a flow channel portion S, two main channels, and a fin pressing plate 230. The flow channel portion S includes fins 240, and the fins 240 define a plurality of fluid channels arranged horizontally. The two main channels are respectively arranged above the two ends of the flow channel portion. The fin pressing plate 230 presses and positions the fins 240 from above, and the two side edges of the fin pressing plate 230 extend into the main channel to allow the fluid to bypass the two side edges of the fin pressing plate 230 and flow between the main channel and the flow channel portion.

[0036] In the present application, the main channel is arranged above the two ends of the flow channel portion, and under the action of the fin pressure plate 230, the fluid bypasses the edge of the fin pressure plate 230 and flows between the main channel and the flow channel portion (the path of the fluid flowing from the inlet main channel to the flow channel portion is shown by the yellow arrow in Figure 4, rather than directly entering the flow channel portion of the green frame portion from the inlet main channel), so that the fluid can flow through the two end areas of the flow channel portion (that is, the flow channel portion within the red frame portion in Figure 4), increasing the heat exchange area (that is, the fluid can exchange heat with the heating element below the two end areas), thereby improving the heat exchange efficiency.

[0037] In addition, the fluid can also form turbulence when flowing between the main channel and the flow channel portion, which is beneficial to heat exchange and can further improve the heat exchange efficiency.

[0038] According to another aspect of the present application, an electric heater is provided, wherein the electric heater includes the circulation chamber assembly of the electric heater of the present application.

[0039] In the electric heater of the present application, a heating element may be provided to heat the fluid flowing through the circulation chamber assembly 200. Specifically, the electric heater may include a heating element provided below the circulation chamber assembly 200 corresponding to the flow channel portion.

[0040] The heating element may only extend to cover the bottom of the flow channel portion, that is, the horizontal projection of the heating element (i.e. the projection of the heating element on the horizontal plane along the vertical direction) is located within the contour range of the horizontal projection of the flow channel portion on the same horizontal plane.

[0041] Due to the use of the circulation chamber assembly of the present application, the main channels are stacked above the two ends of the channel portion, so that the heating elements arranged below the corresponding channel portion can have overlapping horizontal projection portions with the main channels, thereby increasing the total heating power. Therefore, preferably, the heating element can be extended to cover a portion of the area below the main channel. Specifically, the horizontal projection of the channel portion on the arrangement plane of the fluid channel can be located inside the horizontal projection of the heating element on the plane, and the edge of the horizontal projection of the main channel on the plane is located outside the horizontal projection of the heating element on the plane. More specifically, as shown in Figures 2 and 3, the two side edges of the thin film heating element 100 serving as the heating element extend beyond the edge of the fin 240 and are located within the outer edges of the inlet main channel 210 and the outlet main channel 220.

[0042] In addition, the circulation chamber assembly 200 may include two ports located on the same side of the flow channel portion, and the two main flow channels are respectively connected to the two ports. Specifically, as shown in FIG2 , the two ports are located on the upper side of the flow channel portion in the figure, and the two ports can be used as an inlet 201 for fluid to flow into the circulation chamber assembly 200 and an outlet 202 for fluid to flow out of the circulation chamber assembly 200, respectively. The main flow channel connected to the inlet 201 can be used as an inlet main flow channel 210, and the main flow channel connected to the outlet 202 can be used as an outlet main flow channel 220.

[0043] After entering the inlet 210, the fluid flows along the inlet main channel 210. During the flow along the inlet main channel 210, the fluid gradually bypasses the edge of the fin pressure plate 230 and enters the flow channel portion. After flowing through the flow channel portion and being heated, the fluid gradually enters the outlet main channel 220 from the other side of the fin pressure plate 230 and is finally output from the outlet 202.

[0044] In order to increase the fluidity of the fluid in the main channel and the flow channel portion, especially to make the fluid flow uniformly and dispersedly between the flow channel portion and the main channel along the extension direction of the main channel, preferably, the flow cross-sections of the two main channels gradually decrease from the side where the port is located toward the other side of the flow channel portion. Thus, in the flow space of the circulation chamber assembly 200, a pressure loss can be formed that allows the fluid to enter or exit uniformly along various parts of the main channel. Specifically, as shown in Figure 2, starting from the inlet 201, along the extension direction of the inlet main channel 210, the flow cross-section of the inlet main channel 210 gradually decreases, so that the fluid in the inlet main channel 210 can enter the flow channel portion uniformly along the extension direction of the inlet main channel 210; starting from the outlet 202, along the extension direction of the outlet main channel 220, the flow cross-section of the outlet main channel 220 gradually decreases, so that the fluid in the flow channel portion can enter the outlet main channel 220 uniformly along the extension direction of the outlet main channel 220.

[0045] The flow cross-section of the main channel can be gradually reduced in an appropriate manner. For example, in the embodiment shown in FIG2 , taking the inlet main channel 210 as an example, the inlet main channel 210 can have a first portion 211 with a larger flow cross-section near the inlet 201. The end of the first portion 211 forms a step portion 212 with a vertical drop, thereby reducing the flow cross-section by lowering the height. The step portion 212 connects to a second portion 213 with a gradually shrinking horizontal width. This configuration of the inlet main channel 210 can, on the one hand, achieve the desired effect of gradually reducing the flow cross-section, and on the other hand, facilitate one-step molding by methods such as stamping.

[0046] To adapt to different applications, the two main channels can be symmetrically arranged about the center plane between the two ports. In other words, the inlet main channel 210 shown in FIG2 can also be used as the outlet main channel 220, and the outlet main channel 220 can also be used as the inlet main channel 210.

[0047] In order to evenly distribute the fluid in each fluid channel of the flow channel portion, preferably, the edge of the fin pressing plate 230 is gradually retracted inward from the side where the port is located toward the other side of the flow channel portion.

[0048] The edge of the fin pressing plate 230 may be gradually retracted inward in an appropriate manner, which will be described below with reference to two embodiments shown in FIG. 5 and FIG. 11 .

[0049] According to one embodiment of the present application, as shown in FIG5 , the edge of the fin plate 230 is tapered inward in sections. Specifically, the edge of the fin plate 230 includes a first portion 230a that covers the end of the flow channel and a second portion 230b that clears the end of the flow channel. The first portion 230a is provided with a baffle portion 231 extending vertically downward. Thus, for example, fluid entering from the inlet, at the first portion 230a near the port, the fluid can flow downward along the baffle portion 231 into the corresponding fluid channel. At the second portion 230b, farther from the port, the fluid can directly bypass the edge of the second portion and enter the corresponding fluid channel below. In other words, fluid entering the corresponding fluid channel from the first portion 230a encounters greater obstruction than entering the corresponding fluid channel from the second portion 230b. This prevents fluid from primarily bypassing the edge of the fin plate 230 near the port and entering the corresponding fluid channel below, resulting in less fluid flow farther from the port.

[0050] Preferably, in order to further improve the uniform distribution of the fluid along the extension direction of the main channel, the width l of the second part 230b gradually decreases in the direction away from the first part 230a, that is, as the distance from the first part 230a increases, the second part 230b leaves more and more of the fluid channel open, making it easier for the fluid to directly enter the fluid channel corresponding to this part.

[0051] Furthermore, the greater the vertical extension length of the baffle portion 231, the greater its shielding effect on the corresponding fluid channel below, and the greater the obstruction to fluid entering this portion of the fluid channel. Preferably, to enhance the above-mentioned uniform distribution effect, the vertical extension length h of the baffle portion 231 gradually decreases as it approaches the second portion. That is, in the first portion 230a, the degree of obstruction to fluid bypassing the baffle portion 231 decreases as it approaches the second portion 230b.

[0052] The baffle portion 231 may also serve to position the lower fin 240 to ensure that the fin pressing plate 230 and the fin 240 are relatively fixed during assembly (eg, brazing).

[0053] According to another embodiment of the present application, as shown in FIG11 , the edge of the fin pressing plate 230 begins to gradually retract inward from the side where the port is located. That is, as the fin pressing plate 230 extends from the side where the port is located toward the other side of the flow channel portion, the retraction of the fin pressing plate 230 gradually increases, thereby gradually making way for more parts of the flow channel portion below. Taking the fluid entering from the inlet as an example, as the fluid flows along the main flow channel, the fluid can more easily bypass the edge of the fin pressing plate 230 and enter the corresponding fluid channel below, thereby making it easier for the fluid to directly enter the fluid channel along the inlet, thereby achieving the effect of evenly distributing the fluid along the extension direction of the main flow channel.

[0054] To ensure that the fin pressing plate 230 compresses and positions the fins 240, a plurality of protrusions 230c can be spaced apart at the edge of the fin pressing plate 230. The protrusions 230c extend to the ends of the fins 240 below and elastically contact the top cover 260. During positioning and assembly (e.g., brazing), the pressure generated by elastic deformation is used to compress the fins 240. It will be appreciated that as the fin pressing plate 230 extends from the side where the ports are located toward the other side of the flow channel portion, the protrusion distance of the protrusions 230c increases, so that they extend to the ends of the fins 240. Furthermore, the protrusions 230c can be shaped to gradually taper toward the outside of the fin pressing plate 230 (e.g., a triangle as shown) to avoid affecting the uniform distribution of the fluid.

[0055] In this application, the fluid channel is the primary area through which fluid flows in the circulation chamber assembly. The fluid flows along the direction in which the fluid channel extends. The direction in which the fluid channel extends can be set as needed, for example, parallel to the direction in which the main flow channel extends. Preferably, to reduce pressure loss during fluid flow, the direction in which the fluid channel extends is perpendicular to the direction in which the main flow channel extends.

[0056] The fluid channel can be arranged in an appropriate manner. For example, the flow channel portion can include fins 240 to define the fluid channel. The fins 240 can be in an appropriate form. For example, they can include a plurality of fin portions 241 arranged side by side, wherein the plurality of fin portions 241 can form an integrated fin 240. The fin portion 241 can have an appropriate shape to define fluid channels of different cross-sectional shapes. Preferably, as shown in Figure 7, the fin 240 includes a plurality of corrugated fin portions 241, wherein the plurality of fin portions 241 are arranged side by side, and the waveforms of adjacent fin portions 241 are staggered. The staggered waveforms of adjacent fin portions 241 can increase turbulence when the fluid passes through. For example, in the embodiment shown in Figures 6 and 7, the waveforms of adjacent fin portions 241 are staggered and the waveforms of every other fin portion 241 are completely aligned, so that the fin 240 forms a first fluid channel C1 that allows fluid to pass through each fin portion 241 substantially unimpeded, and a second fluid channel C2 that allows a portion of the fluid to collide with the corrugated profile of the fin portion 241 in the flow direction, causing turbulence. Specifically, in the embodiment shown in Figures 6 and 7, the fin portion 241 has a U-shaped cross-section. The first fluid channel C1 is a U-shaped cross-section with an open top or bottom, allowing fluid to pass more smoothly (flowing along the red arrow in Figure 7); the second fluid channel C2 has a portion of the U-shaped cross-section with an open top or bottom, and another portion of the U-shaped cross-section with a rectangular cross-section, so that the fluid collide with the rectangular cross-section when transitioning from the U-shaped cross-section to the rectangular cross-section (flowing along the blue arrow in Figure 7), causing turbulence and movement between the first fluid channel C2 and the second fluid channel C2. This improves the uniformity of fluid distribution between the different fluid channels and increases the collision of the fluid with the fin 240, thereby improving heat exchange efficiency.

[0057] In order to form the main flow channel and the space for setting the flow channel portion, the circulation chamber assembly 200 can adopt an appropriate structure. For example, in the embodiment shown in Figures 2 and 9, the circulation chamber assembly 200 may include a bottom plate 250 and a top cover 260, and the bottom plate 250, the fin pressing plate 230 and the top cover 260 together define the main flow channel and the space for setting the flow channel portion. Specifically, the top cover 260 forms the chamber of the main flow channel by stamping, stretching, etc., and the top cover 260 is brazed and fixed to the top surface of the fin pressing plate 230, thereby defining the main flow channel; the fin 240 is brazed and set between the fin pressing plate 230 and the bottom plate 250, and the fin pressing plate 230 also plays the role of pressing and positioning the fin 240, thereby defining the flow channel portion between the fin pressing plate 230, the fin 240 and the bottom plate 250; the edge of the top cover 260 is brazed and fixed to the edge of the bottom plate 250 to form the circulation chamber assembly 200.

[0058] The bottom plate 250, the fin pressing plate 230, and the top cover 260 can be fixed to each other by appropriate means. Preferably, the bottom plate 250, the fin pressing plate 230, and the top cover 260 can be fixed to each other by brazing. On the one hand, the bottom plate 250, the fin pressing plate 230, and the top cover 260 can be fixed to each other at one time by brazing. On the other hand, the heating element can be thermally sprayed on the bottom side of the bottom plate 250 after brazing, thereby simplifying the preparation process of the electric heater.

[0059] To facilitate monitoring of the operation of the electric heater, temperature sensing units can be installed at corresponding locations on the main channel and the flow channel to monitor the temperature of the main channel and the flow channel. The electric heater can then be controlled based on the monitoring results and operating conditions. In this application, the temperature sensing unit can be installed in a suitable manner. In addition, different installation methods can be used depending on the location of the monitoring area.

[0060] For example, in the embodiment shown in FIG10 , to monitor the temperature of the main flow channel, the top cover 260 includes a first area defining the main flow channel, and the first area is provided with a first temperature sensing unit 270 to detect the temperature of the main flow channel through the first temperature sensing unit 270 (for example, it is provided near the inlet 201 and the outlet 202 to monitor the temperature of the fluid entering and exiting the circulation chamber assembly). In addition, to monitor the temperature of the flow channel portion, the top cover 260 includes a second area defining the space of the flow channel portion, and the second area is provided with a second temperature sensing unit 280 to monitor the temperature of the flow channel portion through the second temperature sensing unit 280.

[0061] Among them, the first temperature sensing unit 270 and the second temperature sensing unit 280 can be in an appropriate form and installed in a corresponding manner. In the embodiment shown in Figure 10, the first area is provided with a mounting groove 261 recessed into the main channel, and the first temperature sensing unit 270 is arranged in the mounting groove 261. Among them, the mounting groove 261 is recessed toward the inner side of the main channel (that is, the inner wall of the main channel is recessed toward the middle of the main channel), thereby increasing the heat exchange area with the fluid in the main channel, so as to obtain more accurate monitoring results. Among them, the first temperature sensing unit can be in an appropriate form, for example, it can include an SMD (surface mount device) sensor, which can be soldered to the PCBA301 of the PCB assembly 300. The mounting groove 261 can be filled with thermal conductive paste to be in thermal contact with the first temperature sensing unit. Of course, the first temperature sensing unit 270 can also be in other forms and installed in a corresponding manner.

[0062] Optionally, the temperature sensing unit for monitoring the flow channel portion can be provided in other ways. In the embodiment shown in Figure 10, a through hole 262 is provided in the second area, and the second temperature sensing unit 280 is provided in the through hole 262. The second temperature sensing unit can be provided in the through hole 262 and can be in contact with the fin pressing plate 230 under the top cover 260, so as to more accurately monitor the temperature of the flow channel portion. The second temperature sensing unit can take an appropriate form, for example, it can include an NTC thermistor, and its pins can be fixed through the insulating protective cover 302 of the PCB assembly 300. The through hole 262 can be filled with thermal conductive paste to be in thermal contact with the second temperature sensing unit. Of course, the second temperature sensing unit 280 can also take other forms and be installed in a corresponding manner.

[0063] In addition, in the present application, the heating element can be in an appropriate form to reduce the size of the electric heater. Preferably, the heating element is a film heating element. More preferably, as shown in Figures 3, 4 and 8, the heating element is a thin film heating element 100 prepared by a thermal spraying process. Specifically, the thin film heating element 100 is located below the circulation chamber assembly 200, and the electric heater also includes a lower cover 500 fixed to the bottom plate 250, and a heating chamber for arranging the heating element is defined between the bottom plate 250 and the lower cover 500. The thin film heating element 100 is a three-layer composite structure, as shown in Figure 8, including a resistance layer 110 (made of NiCr or FeCrAl alloy), an insulating layer 120 and a covering layer 130. The insulating layer 120 and the covering layer 130 are formed of the same insulating material (such as ceramic Al2O3), so that the resistance layer 110 is wrapped between the insulating layer 120 and the covering layer 130. A thermal buffer layer 140 is provided between the thin-film heating element 100 and the aluminum substrate surface of the base plate 250. The material of the thermal buffer layer 140 is typically a NiCr alloy, with a thermal expansion coefficient between that of aluminum and ceramic Al2O3 (the insulating layer material). Furthermore, as shown in FIG9 , the electric heater includes a PCB assembly 300 and an electrode 400 for connecting the connecting end of the heating element to the PCB assembly 300. The electrode 400 can be connected to the heating element and the PCB assembly 300 using a suitable method. In the prior art, the ends of the electrode 400 are typically soldered to the heating element and the PCB assembly 300, but soldering can result in defects such as cold solder joints, air gaps, and cracks. To avoid defects caused by soldering, preferably, in the present application, one end of the electrode 400 is bonded to the connecting end using a conductive adhesive (the conductive adhesive can be in a suitable form, such as conductive silver adhesive). The PCB assembly 300 is provided with a socket 310 for inserting the other end of the electrode.

[0064] According to another aspect of the present application, an electric vehicle is provided, wherein the electric vehicle includes the electric heater of the present application.

[0065] The preferred embodiments of the present application are described in detail above. However, the present application is not limited to the specific details of the above embodiments. Within the technical concept of the present application, various simple modifications can be made to the technical solution of the present application, and these simple modifications all fall within the scope of protection of the present application.

[0066] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner unless there is any contradiction. In order to avoid unnecessary repetition, this application will not further describe various possible combinations.

[0067] In addition, the various implementation methods of the present application may be arbitrarily combined, and as long as they do not violate the concept of the present application, they should also be regarded as the contents disclosed in the present application.

Claims

1. A circulation chamber assembly of an electric heater, characterized in that: The circulation chamber assembly (200) includes a flow channel portion, two main channels, and a fin pressure plate (230). The flow channel portion includes fins (240). The fins (240) define a plurality of fluid channels arranged horizontally. The two main channels are respectively arranged above the two ends of the flow channel portion. The fin pressure plate (230) presses and positions the fins (240) from above. The two side edges of the fin pressure plate (230) extend into the main channel to allow the fluid to bypass the two side edges of the fin pressure plate (230) and flow between the main channel and the flow channel portion.

2. The circulation chamber assembly of the electric heater according to claim 1, characterized in that: The circulation chamber assembly (200) comprises two ports located on the same side of the flow channel portion, and the two main flow channels are respectively connected to the two ports.

3. The circulation chamber assembly of the electric heater according to claim 2, characterized in that: From the side where the port is located toward the other side of the flow channel portion, the flow cross-sections of the two main channels gradually decrease; and / or, The two main channels are symmetrically arranged about a center plane between the two ports.

4. The circulation chamber assembly of the electric heater according to claim 2 or 3, characterized in that: From the side where the port is located toward the other side of the flow channel portion, the edge of the fin pressing plate (230) gradually retracts inward.

5. The circulation chamber assembly of the electric heater according to claim 4, characterized in that: The edge of the fin pressure plate (230) includes a first portion (230a) capable of covering the end of the flow channel portion and a second portion (230b) that leaves the end of the flow channel portion open, the first portion (230a) being provided with a baffle portion (231) extending vertically downward, preferably, the vertical extension length of the baffle portion (231) gradually decreases in a direction toward the second portion (230b); and / or, the width 1 of the second portion (230b) gradually decreases in a direction away from the first portion (230a).

6. The circulation chamber assembly of the electric heater according to claim 1, characterized in that: An extending direction of the fluid channel is perpendicular to an extending direction of the main channel.

7. The circulation chamber assembly of the electric heater according to claim 1, characterized in that: The fin (240) includes a plurality of corrugated fin portions (241), wherein the plurality of fin portions (241) are arranged side by side, and the corrugations of adjacent fin portions (241) are arranged in a staggered manner.

8. The circulation chamber assembly of the electric heater according to claim 1, characterized in that: The circulation chamber assembly (200) includes a bottom plate (250) and a top cover (260), wherein the bottom plate (250), the fin pressing plate (230) and the top cover (260) together define the main flow channel and a space for arranging the flow channel portion.

9. The circulation chamber assembly of the electric heater according to claim 8, characterized in that: The bottom plate (250), the fins (240), the fin pressing plate (230) and the top cover (260) are fixed by brazing; and / or, The top cover (260) includes a first area defining the main flow channel, and the first area is provided with a first temperature sensing unit (270); and / or the top cover (260) includes a second area defining the space of the flow channel portion, and the second area is provided with a second temperature sensing unit (280).

10. An electric heater, characterized in that: The electric heater comprises the circulation chamber assembly of the electric heater according to any one of claims 1-9.

11. The electric heater according to claim 10, characterized in that: The electric heater includes a heating element corresponding to the flow channel portion and arranged below the circulation chamber assembly (200). Preferably, the horizontal projection of the flow channel portion on the arrangement plane of the fluid channel is located inside the horizontal projection of the heating element on the plane, and the edge of the horizontal projection of the main flow channel on the plane is located outside the horizontal projection of the heating element on the plane.

12. The electric heater according to claim 11, characterized in that The heating element is a film heating element, preferably a thin film heating element (100).

13. The electric heater according to any one of claims 10 to 12, characterized in that: The electric heater comprises a PCB assembly (300) and an electrode (400) for connecting a connection end of the heating element and the PCB assembly (300); one end of the electrode (400) is fixed to the connection end by bonding with a conductive adhesive; and the PCB assembly (300) is provided with a socket (310) for plugging the other end of the electrode (400).

14. An electric vehicle, characterized in that: The electric vehicle comprises the electric heater according to any one of claims 10 to 13.

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