CN111491486B

CN111491486B - Composite liquid cooling heat dissipation plate

Info

Publication number: CN111491486B
Application number: CN202010176709.2A
Authority: CN
Inventors: 彭云华; 康乐; 曾志勇
Original assignee: Hunan Yihua Transportation Equipment Co ltd
Current assignee: Hunan Yihua Transportation Equipment Co ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2022-09-02
Anticipated expiration: 2040-03-13
Also published as: CN111491486A

Abstract

The invention provides a composite liquid cooling heat dissipation plate which is arranged in an electric control shell of a new energy electric automobile, wherein the composite liquid cooling heat dissipation plate and the back face of a heat source of the electric control shell are in friction welding to form a sealed space for flowing of cooling liquid, and regularly arranged protruding structures are arranged on the composite liquid cooling heat dissipation plate according to the flowing direction of the cooling liquid to form a flow channel of the cooling liquid. The combined type liquid cooling heat dissipation plate effectively utilizes the space of the electric control shell, and the flow channel of the cooling liquid formed in the sealed space by the convex structure arranged on the combined type liquid cooling heat dissipation plate increases the contact area of the cooling liquid with the heat dissipation plate and the electric control shell, achieves a better heat dissipation effect, and reduces the leakage risk of the cooling liquid and the structural maintenance cost.

Description

Composite liquid cooling heat dissipation plate

Technical Field

The invention relates to the technical field of heat dissipation of new energy electric automobiles, in particular to a composite liquid cooling heat dissipation plate.

Background

At present, new energy electric automobile is rising, and its automatically controlled casing more and more has the trend of high integration, and the IGBT consumption in the automatically controlled casing is also more and more high, also need consider the heat dissipation problem when the degree of integrating constantly improves. The main mode in the prior art is to assemble the electric control shell and the radiator separately by using sealing rubber rings and other modes, and the mode is generally a water-cooling heat dissipation mode in the radiator, so that the leakage risk is easily caused, and the inconvenience caused by maintenance and replacement of the sealing rubber rings after long-term use is avoided. In addition, the heat conductivity coefficient of the existing electric control shell and the radiator is low, so that the liquid cooling heat dissipation requirements of the IGBT with high integration and high power consumption are difficult to meet gradually, and the casting of the electric control shell has draft, so that the liquid contact area at the minimum end is small, and the like, so that the heat dissipation is uneven.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a heat dissipation structure which is suitable for heat dissipation of an electric control shell of a new energy electric automobile and has a good heat dissipation effect.

In order to achieve the purpose, the invention provides a composite liquid cooling heat dissipation plate which is arranged in an electric control shell of a new energy electric vehicle, wherein the composite liquid cooling heat dissipation plate and the back surface of a heat source of the electric control shell are welded into a whole to form a sealed space in which cooling liquid flows, the composite liquid cooling heat dissipation plate is provided with regularly arranged protruding structures, and the protruding structures are located in the sealed space to form a flow channel of the cooling liquid.

Further, the setting of combined type liquid cooling heating panel is the n type, including two parallel heat dissipation mainboards and two of connection the heat dissipation subplate of the same end of heat dissipation mainboard, protruding structure all sets up two the same side of heat dissipation mainboard.

Furthermore, the convex structure is arranged in a long strip shape, an L shape or a conical shape.

Further, the protruding structures are arranged in a diamond shape.

Furthermore, the composite liquid cooling heat sink is made of ADC12 or AL 6063.

Further, the combined type liquid cooling heat dissipation plate and the electronic control shell are welded and sealed in a friction stir welding mode.

Further, the parameters of the friction stir welding are as follows: the rotating speed is 1200r/min, the feeding speed is 150mm/min, the local corner is 120mm/min, and the welding depth is 4.00 mm.

The scheme of the invention has the following beneficial effects:

the composite liquid-cooled heat dissipation plate is installed in an electric control shell of a new energy electric automobile in a welding mode to form a sealed space for flowing of cooling liquid, the shell space is effectively utilized, and a protruding structure arranged on the composite liquid-cooled heat dissipation plate enables the inside of the sealed space to form a flow channel of the cooling liquid, so that the contact area of the cooling liquid with the heat dissipation plate and the electric control shell is increased, a better heat dissipation effect is achieved, and the problems that a traditional die-casting electric control shell is large in size, difficult to dissipate heat, easy to leak, high in maintenance cost and the like are solved;

according to the invention, through simulation analysis and entity product test, the form of the protruding structure is optimized to be a strip shape, an L shape, a conical shape or a rhombic shape, wherein the rhombic shape has the best heat dissipation effect; meanwhile, the material of the heat dissipation plate is further optimized to be AL6063, so that a better heat dissipation effect can be achieved; and the friction stir welding and welding parameters of the composite liquid cooling heat dissipation plate and the electric control shell are optimized, so that a better welding fusion effect is generated.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of the protrusion structure of the present invention;

FIG. 3 is a schematic view of the present invention mounted in an electronically controlled housing;

FIG. 4 is a flow velocity distribution diagram of simulation analysis of a strip-shaped convex structure;

FIG. 5 is a flow velocity distribution diagram of simulation analysis of an L-shaped protrusion structure;

FIG. 6 is a flow velocity distribution diagram of a simulation analysis of a conical bump structure;

FIG. 7 is a diagram of a flow velocity distribution of a diamond-shaped bump structure through simulation analysis;

FIG. 8 is a diagram of a simulation analysis temperature distribution of a strip-shaped convex structure;

FIG. 9 is a simulation analysis temperature distribution diagram of an L-shaped protrusion structure;

FIG. 10 is a temperature distribution diagram of a simulation analysis of a conical bump structure;

FIG. 11 is a diagram of a simulated analysis temperature distribution of a diamond-shaped raised structure.

[ description of reference ]

1-composite liquid cooling plate; 2-an electric control shell; 3-a heat source; 4-a raised structure; 5-a coolant inlet; 6-cooling liquid outlet.

Detailed Description

In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to fig. 3, an embodiment of the invention provides a composite liquid-cooled heat sink 1, which is disposed in an electronic control housing 2 of a new energy electric vehicle, the composite liquid-cooled heat sink 1 and a back surface of a heat source 3 of the electronic control housing 2 are welded together to form a sealed space in which a cooling liquid flows, and meanwhile, the composite liquid-cooled heat sink 1 is provided with regularly arranged protruding structures 4 to partition the sealed space to form a flow channel of the cooling liquid.

In this embodiment, six heat sources 3 are disposed on the electronic control housing 2, the composite liquid cooling panel 1 covers all the heat sources 3, and the composite liquid cooling panel 1 and the electronic control housing 2 form a sealed space by welding. Meanwhile, the composite liquid cooling heat dissipation plate 1 is provided with the protruding structures 4 which are regularly distributed, the protruding structures protrude into the sealed space, and the sealed space is divided into cooling liquid flow channels which are distributed in a staggered mode, so that the contact area between the cooling liquid and the composite liquid cooling heat dissipation plate 1 and the protruding structures 4 is increased, and the heat dissipation efficiency is improved.

Wherein, combined type liquid cooling heating panel 1 sets up and is the n type, including the heat dissipation mainboard of two parallels and the heat dissipation subplate of connecting two heat dissipation mainboards with the one end, two heat dissipation mainboards respectively cover the heat source 3 positions of three departments, protruding structure 4 all sets up the coplanar at two heat dissipation mainboards for the coolant liquid can obtain better radiating effect when flowing through heat source 3 departments.

Further, the convex structures 4 are arranged in a long strip shape, an L shape or a conical shape. More preferably, the protruding structures are arranged in a diamond shape, and the diamond protruding structures need to be kept consistent up and down during plate processing, so that internal flow channels of cooling liquid formed between the shells are kept consistent, and the area of the cooling liquid for taking away heat is increased.

The material of the composite liquid cooling heat sink 1 is ADC12 or AL6063, preferably AL 6063.

The composite liquid cooling heat dissipation plate 1 and the electric control shell 2 are welded and sealed in a friction stir welding mode to form a sealed space, no visible gap exists after sealing, the composite liquid cooling heat dissipation plate 1 and the electric control shell 2 can be well fused, parameters with the best fusion effect can be obtained through tests, the rotating speed is 1200r/min, the feeding speed is 150mm/min, the local turning position is 120mm/min, and the welding depth is 4.00 mm.

Wherein, the selection of the form and the material of the protruding structure 4 has all carried out the optimization of performance through simulation analysis and entity test, and the simulation analysis parameter sets for according to the automatically controlled operating mode of product reality:

flow rate of coolant: 15L/min;

coolant inlet 5 temperature: 65 ℃;

ambient temperature: 30 ℃;

the maximum flow resistance is allowed to be 0.03 MPa;

heat source 3 power consumption: 369KW x 6 (rated power); 1228KW x 6 (peak power 1 min);

cooling liquid medium: 50% ethylene glycol aqueous solution.

Fig. 3 shows the heat source distribution, the monitor point position setting, and the coolant inlet 5/coolant outlet 6 position setting of the test model.

The simulation calculation result by professional heat dissipation simulation software is as follows, and fig. 4 to 7 are flow velocity distribution diagrams on the composite liquid cooling heat sink 1 with the strip-shaped, L-shaped, conical and diamond-shaped protrusion structures 4 respectively. As can be seen from the figure, the average flow velocity of the cooling liquid flowing through the heat dissipation plate with the diamond-shaped convex structures 4 is the lowest, so that the cooling liquid can contact with the heat dissipation surface for a longer time, and theoretically, a better heat dissipation effect is obtained.

Fig. 8 to 11 are temperature distribution diagrams of the composite liquid-cooled cooling plate 1 with the strip-shaped, L-shaped, conical and diamond-shaped convex structures, respectively. As can be seen from the figure, the average temperature of the radiating plates of the L-shaped and rhombic convex structures 4 is lower than that of the other two, and the radiating effect is better.

The test data for the physical product is shown in the following table:

table 1: temperature detection of different types of radiating plates (Unit:. degree. C.)

	TC1	TC2	TC3	TC4	TC5	TC6	IN	OUT
									Conical shape (ADC12)	80.45	81.16	79.91	80.34	81.69	81.10	65.00	66.16
Stripe shape (ADC12)	80.27	80.84	80.41	80.24	80.59	80.81	65.00	67.09
									L shape (ADC12)	79.08	79.49	79.60	79.80	79.42	79.74	65.00	66.23
Diamond shape (ADC12)	78.00	78.84	77.35	78.24	78.63	78.43	65.00	66.00
									Diamond (AL6063)	76.26	76.22	74.78	75.70	77.07	76.78	65.00	65.76

The results of the physical product testing and simulation analysis are integrated to draw conclusions: the performance of the composite liquid cooling heat dissipation plate 1 with the diamond-shaped convex structures 4 is higher than that of the other 3 types, and the composite liquid cooling heat dissipation plate 1 made of AL6063 (with a thermal conductivity of 201.0W/mk) is welded with the electric control shell 2, so that more excellent heat dissipation performance can be achieved.

While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A composite liquid-cooled heat dissipation plate is arranged in an electric control shell of a new energy electric automobile and is characterized in that the composite liquid-cooled heat dissipation plate and the back face of a heat source of the electric control shell are welded into a whole to form a sealed space where cooling liquid flows, protruding structures which are regularly arranged are arranged on the composite liquid-cooled heat dissipation plate, and the protruding structures are located in the sealed space to form a flow channel of the cooling liquid;

the composite liquid cooling heat dissipation plate is arranged in an n shape and comprises two parallel heat dissipation main plates and a heat dissipation auxiliary plate which is connected with the same ends of the two heat dissipation main plates, and the protruding structures are arranged on the same surface of the two heat dissipation main plates;

the convex structure is arranged in an L shape or a rhombus shape;

the composite liquid cooling plate is made of AL 6063;

the composite liquid cooling heat dissipation plate and the electric control shell are welded and sealed in a friction stir welding mode;

the parameters of the friction stir welding are as follows: the rotating speed is 1200r/min, the feeding speed is 150mm/min, the local corner is 120mm/min, and the welding depth is 4.00 mm.