Cooling device for power battery

Abstract

The invention discloses a cooling device for a power battery, the cooling device comprises the power battery, a water tank, a water pump, a radiator and a cooler, the water pump comprises a volute and a centrifugal impeller, and the centrifugal impeller comprises a front disc (61), a rear disc (62), a first blade (63) and a second blade (64); the rear disc comprises a first connecting disc (65) located on the inner side and a second connecting disc (66) located on the outer side, the first connecting disc (65) and the second connecting disc (66) are connected with each other, a first adjusting hole (67) and a second adjusting hole (68) are formed in the first connecting disc (65), a communicating hole (69) is formed in the first connecting disc (65) or the second connecting disc (66), and the first adjusting hole, the communicating hole and the second adjusting hole are sequentially connected; the first adjusting hole is located in the radial peripheral side of the second blade, and the second adjusting hole is close to the concave arc face of the first blade. The thickness / height and laminar flow / turbulent flow characteristics of the boundary layer of the concave arc surface of the first blade can be adjusted / controlled, so that the anti-cavitation performance of the centrifugal pump can be improved, noise can be reduced, the hydraulic performance and efficiency of the water pump can be improved, the service life of the water pump can be prolonged, stable supply of a thermal management system of a power battery can be guaranteed, and the failure rate can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management of power batteries of electric vehicles or hybrid vehicles, and in particular to a cooling or heat dissipation device 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 problems such as unsatisfactory anti-cavitation performance, high noise, difficult adjustment / control of pressure distribution at the outlet of the impeller flow channel, 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 cooling device for a power battery, which can guide a portion of the liquid at the trailing edge of the second blade to the concave surface of the first blade through a connecting hole / connecting groove, so as to adjust / control the boundary layer thickness / height, laminar flow characteristics / turbulent flow characteristics of the concave surface of the first blade, thereby improving the anti-cavitation performance of the centrifugal pump, improving / adjusting the uniformity of pressure distribution at the outlet of the impeller flow channel, reducing noise, improving the hydraulic performance and efficiency of the water pump, and increasing the service life of the water pump, thereby ensuring the stable supply of the thermal management system of the power battery and reducing the failure rate.

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

[0006] A cooling device for a power battery comprises a power battery, a water tank, a water pump, a radiator and a cooler. The power battery is connected to the water pump and the radiator via a first pipeline, the power battery is connected to the water pump and the cooler via a second pipeline, and the cooler is connected to an air conditioning system via a third pipeline. The pump body (1) of the water pump comprises a volute (3), a water outlet pipe (4), a water inlet pipe (5) and a centrifugal impeller (6). The centrifugal impeller is installed in a chamber formed by the volute. The volute is provided with a water outlet pipe and a water inlet pipe. The water outlet pipe is substantially tangent to the outer peripheral wall of the volute. The centrifugal impeller (6) comprises a front disc (61), a rear disc (62), a first blade (63) and a second blade (64). The first blade, The second blade is connected between the front disk and the rear disk, and a plurality of first blades and a plurality of second blades are arranged at intervals along the circumferential direction. The first blades and the second blades are arc-shaped blades and their radial lengths are different; the characteristic is that: the rear disk (62) includes a first connecting disk (65) located on the inner side and a second connecting disk (66) located on the outer side which are connected to each other, a first adjusting hole (67) and a second adjusting hole (68) are opened on the first connecting disk, a connecting hole (69) is opened on the first connecting disk or the second connecting disk, the first adjusting hole, the connecting hole and the second adjusting hole are connected in sequence, the first adjusting hole is located on the radial outer peripheral side of the second blade (64), and the second adjusting hole is arranged close to the concave arc surface of the first blade (63).

[0007] Furthermore, the first adjustment hole (67) is arranged close to the rear edge of the second blade (64), the first adjustment hole is used to introduce a portion of the liquid, the second adjustment hole (68) is used to guide a portion of the reflux liquid to the concave arc surface of the first blade (63), and the connecting hole (69) is arranged between the first connecting plate (65) and the second connecting plate (66).

[0008] Furthermore, the rear disc (62) has an outer radius R1, the second adjustment hole (68) has an inner radius R2, the leading edge of the second blade (64) has an inner radius R3, R3<R2<R1; and R3=(0.4-0.6)R1, R2=(0.5-0.7)R1, R3=(0.7-0.95)R2.

[0009] Furthermore, the outer diameter of the first blade (63) is equal to the outer diameter of the rear disc (62), and the outer diameter of the second blade (64) is smaller than the outer diameter of the rear disc.

[0010] Furthermore, a slide groove (70) is provided on the first connecting disk (65) or the second connecting disk (66), and an adjustment plate (71) is slidably provided in the slide groove, one end of the adjustment plate is connected to the spring (72), and the other end of the spring is connected to the bottom of the slide groove, and the slide groove is located on the radial outer peripheral side of the first adjustment hole (67) and is connected to the first adjustment hole.

[0011] Furthermore, the structure of the adjustment sheet (71) matches the structure of the first adjustment hole (67) and is used to block or open the first adjustment hole (67), and the slide groove (70) is arranged obliquely relative to the radial line or arranged along the radial line.

[0012] Furthermore, when the centrifugal impeller (6) is stationary or running at a first low speed, the centrifugal force on the adjustment plate (71) is smaller than the elastic force of the spring (72), and at this time, the adjustment plate blocks the first adjustment hole (67).

[0013] Furthermore, when the centrifugal impeller (6) is running at the second medium speed, the spring (72) is partially compressed, and at this time, the adjustment plate (71) blocks a portion of the first adjustment hole (67) and opens a portion of the first adjustment hole; when the centrifugal impeller (6) is running at the third high speed, the centrifugal force on the adjustment plate (71) is greater than the elastic force of the spring (72), and at this time, the adjustment plate completely opens the first adjustment hole (67).

[0014] A cooling / heat dissipation device for a power battery of the present invention can guide a portion of the liquid at the trailing edge of the second blade to the concave surface of the first blade through the connecting hole / connecting groove through the design of the first connecting plate, the second connecting plate, the first adjusting hole, the second adjusting hole, and the connecting hole / connecting groove, so as to adjust / control the boundary layer thickness / height, laminar flow characteristics / turbulent flow characteristics of the concave surface of the first blade 63, thereby improving the anti-cavitation performance of the centrifugal pump, improving / adjusting the uniformity of pressure distribution at the outlet of the impeller flow channel, reducing noise, improving the hydraulic performance and efficiency of the water pump, and improving the service life of the water pump, thereby ensuring the supply stability of the thermal management system of the power battery and reducing the failure rate. The present invention can produce the corresponding blocking or opening effect of the first adjusting hole according to the pump speed under different operating conditions through the design of the slide groove, the adjusting plate, and the spring, thereby adjusting the boundary layer thickness / height, laminar flow characteristics / turbulent flow characteristics of the concave surface of the first blade, thereby adjusting / improving the anti-cavitation performance of the centrifugal pump, improving the uniformity of pressure distribution at the outlet of the impeller flow channel, reducing noise, and improving the hydraulic performance and efficiency of the water pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic block diagram of the thermal management system principle for power batteries in the prior art;

[0016] Figure 2 It is a schematic diagram of the structure of a water pump in the prior art;

[0017] Figure 3 It is a front view of the impeller structure of the water pump of the first embodiment of the present invention;

[0018] Figure 4 It is a top view of the impeller structure of the water pump of the first embodiment of the present invention;

[0019] Figure 5 It is a front view of the impeller structure of the water pump of the second embodiment of the present invention;

[0020] Figure 6 It is a top view of the impeller structure of the water pump according to the second embodiment of the present invention.

[0021] In the figure: pump body 1, motor part 2, volute 3, water outlet pipe 4, water inlet pipe 5, centrifugal impeller 6, front disc 61, rear disc 62, first blade 63, second blade 64, first connecting disc 65, second connecting disc 66, first adjusting hole 67, second adjusting hole 68, connecting hole / reflux groove 69, slide groove 70, adjusting plate / opening and closing plate 71, spring 72. DETAILED DESCRIPTION

[0022] 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.

[0023] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0024] like Figure 1-2 As 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.

[0025] The water pump includes a pump body 1 and a motor 2 (including a variable frequency motor). 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. The centrifugal impeller 6 includes a front disc 61, a rear disc 62, a first blade 63, and a second blade 64. The first blade 63 and the second blade 64 are connected between the front disc 61 and the rear disc 62. A plurality of first blades 63 and a plurality of second blades 64 are arranged at intervals along the circumferential direction. The first blade 63 and the second blade 64 are arc-shaped blades and their radial lengths are different. The above technical means or technical features are prior art in this field.

[0026] like Figure 3-4 As shown, a cooling device for a power battery includes a power battery, a water tank, a water pump, a radiator, and a cooler. The power battery is connected to the water pump and the radiator through a first pipeline, the power battery is connected to the water pump and the cooler through a second pipeline, and the cooler is connected to the air conditioning system through a third pipeline. 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 the water outlet pipe 4 and the water inlet pipe 5. The water outlet pipe 4 is roughly tangent to the outer peripheral wall of the volute 3; the centrifugal impeller 6 includes a front disc 61, a rear disc 62, a first blade 63, and a second blade 64. The first blade 63 and the second blade 64 are connected to the front disc Between the rear disc 61 and the rear disc 62, a plurality of first blades 63 and a plurality of second blades 64 are arranged at intervals along the circumferential direction, the first blades 63 and the second blades 64 are arc-shaped blades and their radial lengths are different; it is characterized in that: the rear disc 62 includes a first connecting disc 65 located on the inner side and a second connecting disc 66 located on the outer side which are connected to each other, a first adjusting hole 67 and a second adjusting hole 68 are provided on the first connecting disc 65, a connecting hole / reflux groove 69 is provided on the first connecting disc 65 or the second connecting disc 66, the first adjusting hole 67, the connecting hole 69 and the second adjusting hole 68 are connected in sequence, the first adjusting hole 67 is located on the radial outer peripheral side of the second blade 64, and the second adjusting hole 68 is arranged adjacent to / close to the concave arc surface of the first blade 63.

[0027] Through the design of the first connecting plate 65, the second connecting plate 66, the first adjusting hole 67, the second adjusting hole 68, and the connecting hole / connecting groove 69, the present invention can guide a portion of the liquid at the trailing edge of the second blade 64 to the concave arc surface of the first blade 63 through the connecting hole / connecting groove 69, so as to adjust / control the boundary layer thickness / height, laminar flow characteristics / turbulent flow characteristics of the concave arc surface of the first blade 63, thereby improving the anti-cavitation performance of the centrifugal pump, improving / adjusting the uniformity of pressure distribution at the outlet of the impeller flow channel, reducing noise, improving the hydraulic performance and efficiency of the water pump, and increasing the service life of the water pump, thereby ensuring the stable supply of the thermal management system of the power battery and reducing the failure rate.

[0028] Furthermore, the first adjustment hole 67 is arranged adjacent to / close to the trailing edge of the second blade 64, the first adjustment hole 67 is used to introduce a portion of the liquid (being a liquid inlet hole), the second adjustment hole 68 is used to guide a portion of the reflux liquid to the concave arc surface of the first blade 63, and the connecting hole 69 is arranged between the first connecting plate 65 and the second connecting plate 66.

[0029] The rear disc 62 has an outer radius R1, the second adjustment hole 68 has an inner radius R2, and the leading edge of the second blade 64 has an inner radius R3, R3<R2<R1; and R3=(0.45-0.55)R1, preferably 0.5, R2=(0.55-0.65)R1, preferably 0.6, R3=(0.75-0.9)R2, preferably 0.82.

[0030] The outer diameter of the first blade 63 is equal to the outer diameter of the rear disc 62 , and the outer diameter of the second blade 64 is smaller than the outer diameter of the rear disc 62 .

[0031] like Figure 5-6 As shown, in another embodiment, a slide groove 70 is provided on the first connecting disk 65 or the second connecting disk 66, and an adjusting plate / opening and closing plate 71 is slidably provided in the slide groove 70, one end of the adjusting plate / opening and closing plate 71 is connected to a spring 72, and the other end of the spring 72 is connected to the bottom of the slide groove 70, and the slide groove 70 is located on the radial outer peripheral side of the first adjusting hole 67 and is connected to the first adjusting hole 67.

[0032] The structure / shape of the adjusting piece / opening / closing piece 71 matches the structure / shape of the first adjusting hole 67 and is used to block or open the first adjusting hole 67. The slide groove 70 is arranged obliquely relative to the radial line (eg Figure 6 as shown) or arranged along radial lines.

[0033] When the centrifugal impeller 6 is stationary or running at a first low speed, the centrifugal force on the adjusting plate 71 is smaller than the elastic force of the spring 72 . At this time, the adjusting plate 71 blocks the first adjusting hole 67 .

[0034] When the centrifugal impeller 6 runs at the second medium speed, the spring 72 is partially compressed. At this time, the adjusting plate 71 blocks a part of the first adjusting hole 67 and opens a part of the first adjusting hole 67 .

[0035] When the centrifugal impeller 6 runs at the third highest speed, the centrifugal force on the adjusting plate 71 is greater than the elastic force of the spring 72 . At this time, the adjusting plate 71 completely opens the first adjusting hole 67 .

[0036] The motor part 2 of the water pump includes a variable frequency motor, which controls / regulates the centrifugal impeller 6 to operate within a corresponding design speed range.

[0037] Through the design of the slide groove 70, the adjustment sheet 71, and the spring 72, the present invention can produce a corresponding blocking or opening effect of the first adjustment hole 67 according to the pump speed under different operating conditions, thereby being able to adjust the boundary layer thickness / height, laminar flow characteristics / turbulent flow characteristics of the concave arc surface of the first blade 63, thereby being able to adjust / improve the anti-cavitation performance of the centrifugal pump, improve the uniformity of pressure distribution at the outlet of the impeller flow channel, reduce noise, improve the hydraulic performance and efficiency of the water pump, and increase the service life of the water pump, thereby ensuring the stable supply of the thermal management system of the power battery and reducing the failure rate.

[0038] A cooling or heat dissipation device for a power battery of the present invention can guide a portion of the liquid at the trailing edge of the second blade 64 to the concave arc surface of the first blade 63 through the connecting hole / connecting groove 69 through the design of the first connecting plate 65, the second connecting plate 66, the first adjusting hole 67, the second adjusting hole 68, and the connecting hole / connecting groove 69, so as to adjust / control the boundary layer thickness / height, laminar flow characteristics / turbulent flow characteristics of the concave arc surface of the first blade 63, thereby improving the anti-cavitation performance of the centrifugal pump, improving the uniformity of pressure distribution at the outlet of the impeller flow channel, reducing noise, improving the hydraulic performance and efficiency of the water pump, and increasing the service life of the water pump, thereby ensuring the stable supply of the thermal management system of the power battery and reducing the failure rate. Through the design of the slide groove 70, the adjustment sheet 71, and the spring 72, the present invention can produce a corresponding blocking or opening effect of the first adjustment hole 67 according to the pump speed under different operating conditions, thereby being able to adjust the boundary layer thickness / height, laminar flow characteristics / turbulent flow characteristics of the concave arc surface of the first blade 63, thereby being able to adjust / improve the anti-cavitation performance of the centrifugal pump, improve the uniformity of pressure distribution at the outlet of the impeller flow channel, reduce noise, improve the hydraulic performance and efficiency of the water pump, and increase the service life of the water pump, thereby ensuring the stable supply of the thermal management system of the power battery and reducing the failure rate.

[0039] 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.

[0040] 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 cooling device for a power battery, comprising a power battery, a water tank, a water pump, a radiator, and a cooler, wherein the power battery is connected to the water pump and the radiator through a first pipeline, the power battery is connected to the water pump and the cooler through a second pipeline, and the cooler is connected to an air conditioning system through a third pipeline, the pump body (1) of the water pump comprises a volute (3), a water outlet pipe (4), a water inlet pipe (5), and a centrifugal impeller (6), the centrifugal impeller is installed in a chamber formed by the volute, the volute is provided with a water outlet pipe and a water inlet pipe, and the water outlet pipe is substantially tangent to the outer peripheral wall of the volute; the centrifugal impeller (6) comprises a front disc (61), a rear disc (62), a first blade (63), and a second blade (64), the first blade and the second blade are connected between the front disc and the rear disc, a plurality of first blades and a plurality of second blades are arranged at intervals along the circumferential direction, the first blade and the second blade are arc-shaped blades, and their radial lengths are different; Features: The rear disc (62) includes a first connecting disc (65) located on the inner side and a second connecting disc (66) located on the outer side which are connected to each other. The first connecting disc is provided with a first adjustment hole (67) and a second adjustment hole (68). The first connecting disc or the second connecting disc is provided with a connecting hole (69). The first adjustment hole, the connecting hole and the second adjustment hole are connected in sequence. The first adjustment hole is located on the radial outer peripheral side of the second blade (64), and the second adjustment hole is arranged close to the concave arc surface of the first blade (63).

2. A cooling device for a power battery according to claim 1, characterized in that: The first regulating hole (67) is arranged close to the rear edge of the second blade (64), the first regulating hole is used to introduce a portion of liquid, the second regulating hole (68) is used to guide a portion of the reflux liquid to the concave arc surface of the first blade (63), and the connecting hole (69) is arranged between the first connecting plate (65) and the second connecting plate (66).

3. A cooling device for a power battery according to claim 1, characterized in that: The rear disc (62) has an outer radius R1, the second adjustment hole (68) has an inner radius R2, and the leading edge of the second blade (64) has an inner radius R3, R3<R2<R1; and R3=(0.4-0.6)R1, R2=(0.5-0.7)R1, R3=(0.7-0.95)R2.

4. A cooling device for a power battery according to claim 2 or 3, characterized in that: The outer diameter of the first blade (63) is equal to the outer diameter of the rear disc (62), and the outer diameter of the second blade (64) is smaller than the outer diameter of the rear disc.

5. A cooling device for a power battery as claimed in claim 4, characterized in that: A slide groove (70) is provided on the first connecting disk (65) or the second connecting disk (66), and an adjustment plate (71) is slidably provided in the slide groove, one end of the adjustment plate is connected to a spring (72), and the other end of the spring is connected to the bottom of the slide groove, and the slide groove is located on the radial outer peripheral side of the first adjustment hole (67) and is connected to the first adjustment hole.

6. A cooling device for a power battery as claimed in claim 5, characterized in that: The structure of the adjusting sheet (71) matches the structure of the first adjusting hole (67) and is used to block or open the first adjusting hole (67). The sliding groove (70) is arranged obliquely relative to the radial line or along the radial line.

7. A cooling device for a power battery according to claim 6, characterized in that: When the centrifugal impeller (6) is stationary or running at a first low speed, the centrifugal force on the adjustment plate (71) is smaller than the elastic force of the spring (72), and at this time, the adjustment plate blocks the first adjustment hole (67).

8. A cooling device for a power battery according to claim 6 or 7, characterized in that: When the centrifugal impeller (6) runs at the second medium speed, the spring (72) is partially compressed, and at this time, the adjustment plate (71) blocks a part of the first adjustment hole (67) and opens a part of the first adjustment hole; when the centrifugal impeller (6) runs at the third high speed, the centrifugal force on the adjustment plate (71) is greater than the elastic force of the spring (72), and at this time, the adjustment plate completely opens the first adjustment hole (67).

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