Thermal management system for power battery

Abstract

The thermal management system comprises the power battery, a radiator, a water pump, a water tank and a heater, the water pump comprises a volute, a water outlet pipe, a water inlet pipe and a centrifugal impeller, a second volute plate is arranged in the volute, a diffuser is arranged on the periphery of the centrifugal impeller, and the diffuser comprises diffuser blades; the centrifugal compressor is characterized in that the diffuser comprises a first semicircular part (72) and a second semicircular part (73), the top end roughly passing through the volute tongue, the rotating axis of the centrifugal impeller and the top end of the front edge of the second volute plate are connected to form a dividing line, the dividing line divides the diffuser into the first semicircular part and the second semicircular part, the contour line of the outer periphery of the first semicircular part comprises an arc R1 and an arc R2, and the arc R1 is a circular arc R2. The radius R2 is larger than R1, and the first semicircular part and the second semicircular part are arranged in a central symmetry mode. Turbulence and pressure loss can be reduced, the hydraulic performance of the water pump is improved, the service life of the water pump is prolonged, supply stability of a thermal management system of the power battery can be guaranteed, and the failure rate is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management of power batteries of electric vehicles or hybrid electric vehicles, and in particular to a thermal management system for power batteries. Background Art

[0002] like Figure 1-2 As shown, the existing thermal management system for power batteries includes power batteries, radiators, water pumps, water tanks, heaters, coolers, and air conditioning systems. Power batteries, water tanks, water pumps, and radiators are sequentially arranged on the first circulation pipeline. One or more control valves / regulating valves / solenoid valves are arranged on the first circulation pipeline. A heat dissipation fan is integrated on the radiator. Power batteries, water tanks, water pumps, coolers, and heaters are sequentially arranged on the second circulation pipeline. One or more control valves / regulating valves / solenoid valves are arranged on the second circulation pipeline. The air conditioning system includes a compressor, a condenser, an evaporator, an expansion valve, and a dryer. A cooler, a compressor, a condenser, and a dryer are sequentially arranged on the third circulation pipeline. One or more control valves / regulating valves / solenoid valves are arranged on the third circulation pipeline. A compressor, a condenser, a dryer, an expansion valve, and an evaporator are sequentially arranged on the fourth circulation pipeline. One or more control valves / regulating valves / solenoid valves are arranged on the fourth circulation pipeline. The thermal management system for power batteries is used for cooling / heating and heating / heating of power batteries.

[0003] The water pump comprises a pump body 1 and a motor 2. The pump body 1 comprises a volute 3, a water outlet pipe 4, a water inlet pipe 5 and a centrifugal impeller 6. The centrifugal impeller 6 is installed in the chamber formed by the volute 3. The volute 3 is provided with / connected with a water outlet pipe 4 and a water inlet pipe 5. The water outlet pipe 4 is roughly tangent to the outer peripheral wall of the volute 3. However, the existing water pump still has the problems of turbulence at the diffuser, large pressure loss, small / unstable output pressure, and reduced hydraulic performance of the water pump. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a thermal management system for a power battery, which can increase the output pressure of a centrifugal pump, reduce turbulence, reduce pressure loss, improve the hydraulic performance and efficiency of the water pump, and increase the service life of the water pump through the design of a diffuser, a leading edge, and a volute. This ensures the stable supply of the thermal management system of the power battery and reduces the failure rate.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A thermal management system for a power battery, comprising a power battery, a radiator, a water pump, a water tank, and a heater. The power battery is connected to the water pump and the radiator via a first pipeline, and the power battery is connected to the water pump and the heater via a second pipeline. The water pump comprises a pump body (1) and a motor part (2). The pump body comprises a volute (3), a water outlet pipe (4), a water inlet pipe (5), and a centrifugal impeller (6). A second volute plate (31) is arranged in the volute. A diffuser (7) is arranged on the outer periphery of the centrifugal impeller. A volute tongue (8) is arranged at the connection between the water outlet pipe and the volute. The diffuser comprises diffuser blades (71), and a plurality of diffuser blades are distributed along the circumferential direction. ; It is characterized in that: the diffuser (7) includes a first semicircular portion (72) and a second semicircular portion (73), and a dividing line is formed by roughly passing through the top of the volute tongue, the rotation axis of the centrifugal impeller, and the top of the leading edge of the second volute plate, and the dividing line divides the diffuser into a first semicircular portion and a second semicircular portion. The outer peripheral contour line of the first semicircular portion includes arcs R1 and R2, and there is a smooth transition between the arcs R1 and R2, and the radius R2>R1. The outer peripheral contour line of the second semicircular portion also includes arcs R1 and R2, and there is a smooth transition between the arcs R1 and R2. The first semicircular portion and the second semicircular portion are centrally symmetrically arranged.

[0007] Furthermore, the circular arc R2 is located at the downstream end of the circular arc R1, and the radial width of the diffuser (7) having the circular arc R1 is smaller than the radial width of the diffuser having the circular arc R2.

[0008] Further, the radius R2 = (1.05-1.30) R1.

[0009] Furthermore, the second volute plate (31) has a leading edge portion (32), a first channel (74) is provided between the leading edge portion and the trailing edge end of the first semicircular portion (72), a second channel (75) is provided between the volute tongue (8) and the trailing edge end of the second semicircular portion (73), and the outer radius of the leading edge portion is substantially equal to the radius R2 of the arc R2; in the projection view of the cross section passing through the axis, an inclined portion (33) is provided at the top end of the leading edge portion.

[0010] Furthermore, the angle between the inclined portion (33) and the axis of the centrifugal impeller (6) is 10-45°.

[0011] Furthermore, the volute tongue (8) includes a thickened portion (81) and a reflux channel (82). The volute tongue is provided with a thickened portion on one side close to the second volute plate (31). The thickened portion includes an arcuate surface and a flat surface. The flat surface is roughly tangent to the outer peripheral edge of the arc R2 portion. The reflux channel is provided on the volute tongue. The reflux channel connects the water outlet channel of the water outlet pipe (4) and the tongue gap channel on the inner peripheral side of the volute tongue, and is used to guide a portion of the liquid to the water outlet channel of the water outlet pipe through the reflux channel.

[0012] Furthermore, the second channel (75), the tongue gap channel, and the reflux channel (82) are adjacent to each other and connected in sequence.

[0013] A thermal management system for a power battery of the present invention can reduce turbulence, reduce pressure loss, increase the output pressure of a centrifugal pump, improve the hydraulic performance and efficiency of a water pump, and increase the service life of the water pump through the design of a diffuser, a leading edge portion, and a volute tongue, thereby ensuring stable supply of the thermal management system of the power battery and reducing the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic block diagram of the thermal management system principle for power batteries in the prior art;

[0015] Figure 2 It is a schematic diagram of the structure of a water pump in the prior art;

[0016] Figure 3 This is a schematic diagram of the water pump structure of the present invention;

[0017] Figure 4 This is a schematic diagram of the water pump structure of the present invention;

[0018] Figure 5 It is a schematic diagram of the front edge structure of the second volute plate of the present invention.

[0019] In the figure: pump body 1, motor part 2, volute 3, water outlet pipe 4, water inlet pipe 5, centrifugal impeller 6, diffuser 7, volute tongue 8; second volute plate 31, leading edge part 32, inclined part 33, diffuser blade 71, first semicircular part 72, second semicircular part 73, first channel 74, second channel 75, thickened part 81, reflux channel 82. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] like Figure 1-2As shown, an existing thermal management system for power batteries includes power batteries, radiators, water pumps, water tanks, heaters, coolers, and air conditioning systems. Power batteries, water tanks, water pumps, and radiators are sequentially arranged on the first circulation pipeline. One or more control valves / regulating valves / solenoid valves are arranged on the first circulation pipeline. A heat dissipation fan is integrated on the radiator. Power batteries, water tanks, water pumps, coolers, and heaters are sequentially arranged on the second circulation pipeline. One or more control valves / regulating valves / solenoid valves are arranged on the second circulation pipeline; the air conditioning system includes a compressor, a condenser, an evaporator, an expansion valve, and a dryer. A cooler, a compressor, a condenser, and a dryer are sequentially arranged on the third circulation pipeline. One or more control valves / regulating valves / solenoid valves are arranged on the third circulation pipeline. A compressor, a condenser, a dryer, an expansion valve, and an evaporator are sequentially arranged on the fourth circulation pipeline. One or more control valves / regulating valves / solenoid valves are arranged on the fourth circulation pipeline. The thermal management system for power batteries is used for cooling / heating and heating / heating of power batteries. The above technical means or technical features are prior art in this field.

[0023] The water pump includes a pump body 1 and a motor 2. The pump body 1 includes a volute 3, a water outlet pipe 4, a water inlet pipe 5, and a centrifugal impeller 6. The centrifugal impeller 6 is installed in the chamber formed by the volute 3. The volute 3 is provided with / connected with a water outlet pipe 4 and a water inlet pipe 5. The water outlet pipe 4 is roughly tangent to the outer peripheral wall of the volute 3.

[0024] like Figure 3-5 As shown, the pump body 1 of the water pump of the present invention includes a volute 3, a water outlet pipe 4, a water inlet pipe 5, and a centrifugal impeller 6. The centrifugal impeller 6 is installed in the chamber formed by the volute 3. The volute 3 is provided with / connected with a water outlet pipe 4 and a water inlet pipe 5. The water outlet pipe 4 is roughly tangent to the outer peripheral wall of the volute 3. A second volute plate 31 is provided in the volute 3. A diffuser 7 is provided on the outer periphery of the centrifugal impeller 6. A volute tongue 8 is provided at the connection between the water outlet pipe 4 and the volute 3. The diffuser 7 includes diffuser blades 71, and a plurality of diffuser blades 71 are distributed along the circumferential direction. The above technical means or technical features are prior art in this field.

[0025] The diffuser 7 includes a first semicircular portion 72 and a second semicircular portion 73, which are connected to form a dividing line through the top of the volute tongue 8, the rotation axis of the centrifugal impeller 6, and the top of the leading edge of the second volute plate 31. The dividing line divides the diffuser 7 into a first semicircular portion 72 and a second semicircular portion 73, and is characterized in that: the outer peripheral edge contour line of the first semicircular portion 72 includes arcs R1 and R2, and there is a smooth transition between the arcs R1 and R2, and the radius R2>R1; the outer peripheral edge contour line of the second semicircular portion 73 also includes arcs R1 and R2, and there is a smooth transition between the arcs R1 and R2, and the first semicircular portion 72 and the second semicircular portion 73 are centrally symmetrically arranged.

[0026] The present invention makes the outer periphery of the diffuser 7 non-circular and the dividing line divides the diffuser 7 into a first semicircular part 72 and a second semicircular part 73, and the radius R2 is greater than the radius R1. This can increase the output pressure of the centrifugal pump, reduce turbulence at the outlet of the diffuser 7, improve the hydraulic performance and efficiency of the water pump, increase the service life of the water pump, ensure the stable supply of the thermal management system of the power battery, and reduce the failure rate.

[0027] “Substantially” can be understood as: the dividing line passes through the top point of the volute tongue 8 or has a very small central angle (≤3° or ≤5°) with the top point in the circumferential direction.

[0028] The arc R2 is located at the downstream end of the arc R1, and the radial width of the portion of the diffuser 7 having the arc R1 is smaller than the radial width of the portion of the diffuser 7 having the arc R2. The radius R2=(1.05-1.25)R1, preferably 1.1-1.2.

[0029] Further, the second volute plate 31 has a leading edge portion 32, a first channel 74 is provided between the leading edge portion 32 and the trailing edge end of the first semicircular portion 72, a second channel 75 is provided between the volute tongue 8 and the trailing edge end of the second semicircular portion 73, and the outer radius of the leading edge portion 32 is substantially equal to or slightly smaller than the radius R2 of the arc R2; in the projection view of the cross section through the axis, an inclined portion 33 or an inclined surface 33 is provided at the top end of the leading edge portion 32. The present invention can reduce the turbulent resistance and flow resistance between the leading edge portion 32 and the trailing edge end of the first semicircular portion 72 through the design of the inclined portion 33, thereby improving the hydraulic performance of the water pump, increasing the service life of the water pump, and ensuring the stable supply of the thermal management system of the power battery and reducing the failure rate.

[0030] The angle between the inclined portion 33 and the axis (axial direction) of the centrifugal impeller 6 is 15-35°.

[0031] The volute tongue 8 includes a thickened portion 81 and a reflux channel 82. The volute tongue 8 is provided with a thickened portion 81 on one side close to the second volute plate 31. The thickened portion 81 includes an arc portion / arc surface and a straight portion / straight surface. The straight surface is roughly tangent to the outer periphery of the arc R2 portion or has an angle of 80-100° with the radial line. The volute tongue 8 is provided with a reflux channel 82. The reflux channel 82 connects the outlet channel of the outlet pipe 4 with the tongue gap channel on the inner periphery of the volute tongue 8, and is used to guide a part of the liquid to the outlet channel of the outlet pipe 4 through the reflux channel 82. The present invention can guide a part of the liquid to the outlet channel of the outlet pipe 4 through the reflux channel 82 through the design of the thickened portion 81 and the reflux channel 82, reduce the pressure loss of the centrifugal pump, reduce the flow resistance at the volute tongue 8, thereby improving the hydraulic performance of the water pump and improving the service life of the water pump.

[0032] The second channel 75 , the tongue gap channel, and the reflux channel 82 are adjacent to and connected to each other in sequence.

[0033] A thermal management system for a power battery of the present invention can reduce turbulence, reduce pressure loss, increase the output pressure of a centrifugal pump, improve the hydraulic performance and efficiency of a water pump, and increase the service life of a water pump through the design of a diffuser 7, a leading edge portion 32, and a volute tongue 8, thereby ensuring stable supply of the thermal management system of the power battery and reducing the failure rate.

[0034] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, horizontal, vertical, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. The "connection" mentioned above can be a direct connection or an indirect connection, and the "setting", "setting at" and "setting at" can be directly set at or indirectly set at.

[0035] The above-mentioned implementation modes are for explanation of the present invention rather than limitation of the present invention. It can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A thermal management system for a power battery, comprising a power battery, a radiator, a water pump, a water tank, and a heater, wherein the power battery is connected to the water pump and the radiator through a first pipeline, and the power battery is connected to the water pump and the heater through a second pipeline, the water pump comprises a pump body (1), a motor part (2), the pump body comprises a volute (3), a water outlet pipe (4), a water inlet pipe (5), and a centrifugal impeller (6), a second volute plate (31) is arranged in the volute, a diffuser (7) is arranged on the outer periphery of the centrifugal impeller, a volute tongue (8) is arranged at the connection between the water outlet pipe and the volute, the diffuser comprises diffuser blades (71), and a plurality of diffuser blades are distributed along the circumferential direction; characterized in that: The diffuser (7) comprises a first semicircular portion (72) and a second semicircular portion (73), and a dividing line is formed by roughly passing through the top of the volute tongue, the rotation axis of the centrifugal impeller, and the top of the leading edge of the second volute plate. The dividing line divides the diffuser into the first semicircular portion and the second semicircular portion. The outer peripheral contour line of the first semicircular portion comprises arcs R1 and R2, and the arcs R1 and R2 have a smooth transition, and the radius R2>R1. The outer peripheral contour line of the second semicircular portion also comprises arcs R1 and R2, and the arcs R1 and R2 have a smooth transition. The first semicircular portion and the second semicircular portion are centrally symmetrically arranged.

2. A thermal management system for a power battery according to claim 1, characterized in that: The arc R2 is located at the downstream end of the arc R1, and the radial width of the diffuser (7) having the arc R1 is smaller than the radial width of the diffuser having the arc R2.

3. A thermal management system for a power battery according to claim 1, characterized in that: Radius R2 = (1.05-1.30) R1.

4. A thermal management system for a power battery according to claim 2 or 3, characterized in that: The second volute plate (31) has a leading edge portion (32), a first channel (74) is provided between the leading edge portion and the trailing edge end of the first semicircular portion (72), a second channel (75) is provided between the volute tongue (8) and the trailing edge end of the second semicircular portion (73), and the outer radius of the leading edge portion is substantially equal to the radius R2 of the arc R2; in the projection view of the cross section passing through the axis, an inclined portion (33) is provided at the top end of the leading edge portion.

5. A thermal management system for a power battery according to claim 4, characterized in that: The angle between the inclined portion (33) and the axis of the centrifugal impeller (6) is 10-45°.

6. A thermal management system for a power battery according to claim 5, characterized in that: The volute tongue (8) comprises a thickened portion (81) and a reflux channel (82). The volute tongue is provided with a thickened portion on one side close to the second volute plate (31). The thickened portion comprises an arcuate surface and a flat surface. The flat surface is roughly tangent to the outer peripheral edge of the arc R2 portion. The volute tongue is provided with a reflux channel. The reflux channel connects the water outlet channel of the water outlet pipe (4) and the tongue gap channel on the inner peripheral side of the volute tongue, and is used to guide a portion of the liquid to the water outlet channel of the water outlet pipe through the reflux channel.

7. A thermal management system for a power battery according to claim 6, characterized in that: The second channel (75), the tongue gap channel, and the reflux channel (82) are adjacent to each other and are connected in sequence.

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