Automobile air conditioner fan for lithium battery heat dissipation

Abstract

The utility model relates to an automobile air conditioner fan for heat dissipation of a lithium battery, and belongs to the technical field of heat dissipation of new energy automobiles. Aiming at the problems of poor wind gathering capability and loud operation vibration noise of a lithium battery heat dissipation fan in the prior art, the utility model provides the heat dissipation fan which has the advantages of optimized air duct structure, vibration and noise reduction and low electromagnetic interference. According to the fan, the upper spiral shell and the lower spiral shell are connected with the buckle type shell in an inserted mode to improve the wind gathering efficiency, vibration noise is reduced through the inner-layer rubber gasket structure and the outer-layer rubber gasket structure, the annular magnetic shoe is arranged on the motor rotor to suppress electromagnetic interference, and finally the technical effects of being high in heat dissipation efficiency, silent in operation and high in reliability are achieved. The fan is particularly suitable for the heat dissipation requirement of a new energy automobile lithium battery thermal management system.

Description

Technical Field

[0001] The utility model belongs to the technical field of thermal management of new energy vehicles, and specifically relates to an automobile air-conditioning fan for dissipating heat from lithium batteries, and in particular to a heat dissipation fan with optimized air duct structure, vibration reduction, noise reduction and low electromagnetic interference characteristics. Background Art

[0002] With the rapid development of new energy vehicle technology, lithium batteries, as the core power source, have become a key factor affecting vehicle safety and performance. The optimal operating temperature range for lithium batteries is typically 25-40°C. When temperatures exceed 200-300°C, thermal runaway can occur, leading to fire or explosion. Therefore, a battery management system (BMS) is required to monitor and protect lithium battery temperatures in real time, with the cooling system being a crucial component of the BMS.

[0003] Currently, air cooling is commonly used to dissipate heat from lithium batteries in new energy vehicles. Air is driven by the car's air conditioning fan to flow through the lithium battery radiator to achieve heat exchange. However, existing cooling fans have the following drawbacks:

[0004] Poor wind gathering ability: The air duct structure design of traditional fans is unreasonable, and the airflow is easily dispersed before entering the wind wheel, resulting in low efficiency of the wind wheel to utilize the airflow and poor heat dissipation effect;

[0005] High vibration and noise: When the fan is running, the motor vibration and airflow disturbance are easily transmitted to the vehicle body through the casing, generating obvious noise, which seriously affects the driving quality of new energy vehicles;

[0006] Electromagnetic interference and mechanical loss: When the motor is running, the interaction between the stator coil and the rotor magnetic field is likely to generate electromagnetic interference. At the same time, mechanical friction loss limits the speed and efficiency.

[0007] Therefore, there is an urgent need for a lithium battery cooling fan with optimized structure, vibration reduction and noise reduction and efficient operation to solve the above technical problems. Utility Model Content

[0008] In order to solve the above problems, the purpose of this utility model is to provide an automobile air-conditioning fan for lithium battery heat dissipation, which improves the wind gathering efficiency by optimizing the shell structure, adopts a vibration reduction structure to reduce operating noise, and improves the motor design to suppress electromagnetic interference, thereby solving the problems of poor wind gathering ability, high vibration noise and low efficiency of the heat dissipation fan in the existing technology.

[0009] To achieve the above-mentioned object, the present invention provides the following technical solution: an automobile air-conditioning fan for heat dissipation of lithium batteries, comprising a housing, a base, a motor and a wind wheel, wherein the wind wheel is mounted on the rotating shaft of the motor; the housing comprises an upper spiral shell and a lower spiral shell, the motor is fixedly mounted on the base, and the lower spiral shell is fixedly connected to the base; a U-shaped slot is provided on the lower end surface of the upper spiral shell along its edge, and an insert block is provided on the upper end surface of the lower spiral shell that matches the U-shaped slot, and the upper and lower spiral shells are positioned by plugging and positioning the U-shaped slot and the insert block, and then fixed by a snap connection; an air inlet slot is provided in the middle of the housing for the wind wheel to be placed in; a spiral air outlet duct surrounding the wind wheel is formed between the upper and lower spiral shells;

[0010] The inner wall of the upper spiral shell is provided with an annular air inlet ring, and an annular curved hook groove is formed between the inner wall of the air inlet ring and the inner wall of the upper spiral shell; the upper end of the wind wheel is provided with an annular connecting ring, the cross section of the connecting ring is a nearly vertical arc, and the upper part of the connecting ring is embedded in the curved hook groove; the lower end of the wind wheel is a mounting seat, and the mounting seat is fixedly mounted on the end of the rotating shaft of the motor; a plurality of blades are evenly distributed around the circumference between the mounting seat and the connecting ring;

[0011] The housing is provided with a plurality of vertically arranged mounting plates, each of which is provided with a U-shaped slot; a first rubber gasket is embedded in each U-shaped slot, and an annular matching groove is provided in the middle of the first rubber gasket, and the matching groove is tightly fitted with the inner wall of the U-shaped slot; the lower surface of the base is evenly distributed with supporting plates, and the end of each supporting plate is provided with a connecting hole; a second rubber gasket is disposed in each connecting hole, and the annular matching groove on the outer wall of the second rubber gasket is tightly fitted with the inner wall of the connecting hole;

[0012] The motor comprises a stator and a rotor, wherein a coil winding is wound on the stator; a rotary cover is sleeved on the rotating shaft of the rotor, and an annular magnetic tile is fixed on the inner cavity side wall of the rotary cover.

[0013] Furthermore, the cross-section of the spiral air outlet duct is gradually expanding, the inlet end of the spiral air outlet duct is connected to the air inlet slot, and the outlet end extends toward the tangential direction of the wind wheel to guide the airflow to accelerate along the spiral trajectory.

[0014] Furthermore, the arc-shaped cross-section of the connecting ring matches the curvature of the hook groove, ensuring that there is no gap between the fitting surfaces of the connecting ring and the hook groove.

[0015] Furthermore, the cross-section of the matching groove of the first rubber gasket is semicircular, and its radius is consistent with the width of the slot of the U-shaped slot; the cross-section of the matching groove of the second rubber gasket is trapezoidal, and its large end faces the outside of the base to enhance the clamping force with the connecting hole.

[0016] Furthermore, the magnetic tile is made of neodymium iron boron material with a thickness of 2-5 mm. The rotary cover is interference fit with the rotating shaft to prevent the magnetic tile from loosening during high-speed rotation.

[0017] The beneficial effects of the utility model are:

[0018] Improved wind gathering efficiency: The air inlet ring and hook groove structure of the upper spiral shell, combined with the arc-shaped cross-section of the connecting ring, guide the airflow into the wind wheel, reduce airflow dispersion loss, and significantly improve the wind wheel's airflow capture efficiency;

[0019] Significant vibration and noise reduction effects: The housing's U-shaped slots and plug-in snap-on structure enable quick assembly. Combined with a double-layer vibration reduction design featuring a first rubber gasket (located at the fan top mounting point) and a second rubber gasket (located at the base support point), this effectively isolates the transmission path of motor vibration to the vehicle body, reducing operating noise by 10-15dB.

[0020] Electromagnetic interference suppression and efficiency improvement: Annular magnetic tiles are installed inside the motor rotor's rotating cover to optimize the air gap magnetic field distribution, suppress electromagnetic interference (EMC) and high-frequency noise, and reduce mechanical friction loss between the stator and rotor. This increases the motor speed by 5%-8% and improves heat dissipation efficiency by more than 10%.

[0021] Compact structure and easy assembly: The plug-in snap-on connection between the upper and lower spiral shells simplifies the assembly process. The gradually expanding design of the spiral air outlet adapts to the airflow output characteristics of the wind wheel. The overall structure is compact and occupies little space, making it suitable for the limited installation space of new energy vehicles.

[0022] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional diagram of a specific embodiment of the present utility model Figure 1 ;

[0024] Figure 2 A three-dimensional diagram of a specific embodiment of the present utility model Figure 2 ;

[0025] Figure 3 An exploded view of a specific embodiment of the present utility model;

[0026] Figure 4 A cross-sectional view of a specific embodiment of the present utility model;

[0027] Figure 5 for Figure 4 A magnified view of middle A;

[0028] Figure 6 for Figure 4 Magnified view of B.

[0029] Explanation of the reference numerals: 1-housing; 11-upper spiral shell; 111-U-shaped slot; 112-air inlet ring; 113-hook slot; 12-lower spiral shell; 121-insert block; 13-spiral air outlet; 2-base; 21-foot plate; 22-connecting hole; 3-motor; 31-stator; 311-coil winding; 32-rotor; 321-rotating shaft; 322-screw cover; 323-magnetic tile; 4-wind wheel; 41-connecting ring; 42-mounting seat; 43-blade; 5-mounting plate; 51-U-shaped slot; 6-first rubber gasket; 61-matching slot; 7-second rubber gasket. DETAILED DESCRIPTION

[0030] The present invention is described in detail below through examples, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0031] like Figure 1 — Figure 3 As shown, this embodiment discloses the automobile air-conditioning fan for heat dissipation of lithium batteries according to the utility model, which is mainly composed of a housing 1, a base 2, a motor 3, a wind wheel 4 and a vibration reduction structure.

[0032] Shell structure

[0033] Specific as Figure 4 、 Figure 6 As shown, the housing 1 consists of an upper spiral housing 11 and a lower spiral housing 12, which are connected by a snap-fit ​​connection. A U-shaped slot 111 (approximately 15 mm deep and with a width matching that of an insert 121) is machined along the lower end of the upper spiral housing 11. A corresponding insert 121 is positioned on the upper end of the lower spiral housing 12. After being plugged in and positioned, the two are locked together using snap-fit ​​connections (which can be supplemented by elastic snaps or bolts), forming a complete spiral housing.

[0034] An air inlet slot (matching the diameter of the impeller 4) is defined in the center of the housing 1 to guide external airflow into the impeller. A spiral outlet duct 13 (with a gradually expanding cross-section, with a narrower inlet width than the outlet, and an angle of approximately 15°) is formed between the upper and lower spiral shells 11 and 12. This spiral duct accelerates the airflow through the impeller and flows along a spiral path, extending its residence time in the radiator and improving heat dissipation efficiency.

[0035] Wind wheel and wind gathering structure

[0036] Specific as Figure 4 、 Figure 5As shown, the wind rotor 4 comprises a connecting ring 41, a mounting base 42, and blades 43. The connecting ring 41 is located at the upper end of the wind rotor and has a vertically curved cross-section. Its upper portion moves within the hook groove 113 (with a depth of approximately 3 mm, half the thickness of the upper spiral shell wall) on the inner wall of the upper spiral shell 11, preventing airflow from leaking from the top of the wind rotor. The mounting base 42 is fixed to the end of the rotating shaft 321 of the motor 3 (connected via a flat key or spline). The blades 43 are evenly distributed around the circumference between the mounting base 42 and the connecting ring 41 (there are 20-32 blades 43, and their angles match the spiral outlet duct 13).

[0037] Vibration reduction structure design

[0038] Multiple vertically arranged mounting plates 5 are mounted on the housing 1. Each mounting plate 5 has a U-shaped slot 51 (the width of which matches the width of the vibration-damping washer). A first rubber washer 6 is embedded within the U-shaped slot 51. Its mating groove 61 (a semicircular shape with a radius matching the width of the U-shaped slot 51) fits snugly into the slot. When the mounting plates 5 are bolted to the vehicle body, the first rubber washer 6 absorbs lateral vibration.

[0039] Three footplates 21 are evenly distributed around the lower surface of the base 2. Each footplate 21 has a connection hole 22 (diameter matching the vehicle mounting hole) at its end. A second rubber washer 7 is positioned within the connection hole 22, its mating groove forming an interference fit with the hole wall. When the base 2 is secured with bolts, the second rubber washer 7 absorbs longitudinal vibration. This dual vibration damping structure effectively reduces vibration transmission during fan operation, reducing noise by over 10dB.

[0040] Motor optimization design

[0041] The stator 31 of motor 3 is wound with coil windings 311. A rotary cover 322 (made of aluminum alloy and with an interference fit) is sleeved onto the rotating shaft 321 of rotor 32. An annular magnetic tile 323 (made of neodymium iron boron, 3mm thick) is fixed to the inner sidewall of the rotary cover 322. The magnetic tile 323 enhances the rotor's magnetic field strength, optimizes the air gap magnetic field distribution, and suppresses electromagnetic interference (reducing radiated interference by 20dB in EMC testing). It also reduces cogging torque between the stator and rotor, lowering mechanical losses. The motor achieves a maximum speed of 3000 rpm (an 8% increase over traditional motors) and improves heat dissipation efficiency by 12%.

[0042] The following technical effects can be achieved by adopting the above technical solution:

[0043] Improved wind gathering efficiency: The air inlet ring and hook groove structure of the upper spiral shell, combined with the arc-shaped cross-section of the connecting ring, guide the airflow into the wind wheel, reduce airflow dispersion loss, and significantly improve the wind wheel's airflow capture efficiency;

[0044] Significant vibration and noise reduction effects: The housing's U-shaped slots and plug-in snap-on structure enable quick assembly. Combined with a double-layer vibration reduction design featuring a first rubber gasket (located at the fan top mounting point) and a second rubber gasket (located at the base support point), this effectively isolates the transmission path of motor vibration to the vehicle body, reducing operating noise by 10-15dB.

[0045] Electromagnetic interference suppression and efficiency improvement: Annular magnetic tiles are installed inside the motor rotor's rotating cover to optimize the air gap magnetic field distribution, suppress electromagnetic interference (EMC) and high-frequency noise, and reduce mechanical friction loss between the stator and rotor. This increases the motor speed by 5%-8% and improves heat dissipation efficiency by more than 10%.

[0046] Compact structure and easy assembly: The plug-in snap-on connection between the upper and lower spiral shells simplifies the assembly process. The gradually expanding design of the spiral air outlet adapts to the airflow output characteristics of the wind wheel. The overall structure is compact and occupies little space, making it suitable for the limited installation space of new energy vehicles.

Claims

1. An automobile air-conditioning fan for dissipating heat from lithium batteries, comprising a housing (1), a base (2), a motor (3), and a wind wheel (4), wherein the wind wheel (4) is mounted on a rotating shaft (321) of the motor (3); characterized in that: The housing (1) comprises an upper spiral housing (11) and a lower spiral housing (12); the motor (3) is fixedly mounted on the base (2); the lower spiral housing (12) is fixedly connected to the base (2); a U-shaped slot (111) is provided on the lower end surface of the upper spiral housing (11) along its edge; an insert (121) is provided on the upper end surface of the lower spiral housing (12) to match the U-shaped slot (111); the upper spiral housing (11) and the lower spiral housing (12) are connected by snapping after being plugged and positioned through the U-shaped slot (111) and the insert (121); an air inlet slot for the wind wheel (4) is provided in the middle of the housing (1); a spiral air outlet duct (13) surrounding the wind wheel (4) is formed between the upper spiral housing (11) and the lower spiral housing (12); an annular air inlet ring (112) is provided on the inner wall of the upper spiral housing (11); the air inlet ring (112) is provided on the inner wall of the upper spiral housing (11); 2) an annular hook groove (113) is formed between the inner wall and the inner wall of the upper spiral shell (11); an annular connecting ring (41) is provided at the upper end of the wind wheel (4), the cross section of the connecting ring (41) is a nearly vertical arc, and the upper part of the connecting ring (41) is embedded in the hook groove (113); the lower end of the wind wheel (4) is a mounting seat (42), and the mounting seat (42) is fixedly mounted on the end of the rotating shaft (321) of the motor (3); a plurality of blades (43) are evenly distributed around the circumference between the mounting seat (42) and the connecting ring (41); the motor (3) includes a stator (31) and a rotor (32), and a coil winding (311) is wound on the stator (31); a rotary cover (322) is sleeved on the rotating shaft (321) of the rotor (32), and an annular magnetic tile (323) is fixedly provided on the inner cavity side wall of the rotary cover (322).

2. The automotive air-conditioning fan for dissipating heat from lithium batteries according to claim 1, characterized in that: The housing (1) is provided with a plurality of vertically arranged mounting plates (5), each of which is provided with a U-shaped slot (51); a first rubber gasket (6) is embedded in each of the U-shaped slots (51), a ring-shaped matching slot (61) is provided in the middle of the first rubber gasket (6), and the matching slot (61) is tightly fitted with the inner wall of the U-shaped slot (51); the lower surface of the base (2) is evenly distributed with supporting plates (21), and the end of each supporting plate (21) is provided with a connecting hole (22); a second rubber gasket (7) is arranged in each of the connecting holes (22), and the ring-shaped matching slot on the outer wall of the second rubber gasket (7) is tightly fitted with the inner wall of the connecting hole (22).

3. The automotive air-conditioning fan for dissipating heat from lithium batteries according to claim 1, characterized in that: The cross section of the spiral air outlet duct (13) is gradually expanding, its inlet end is connected to the air inlet slot, and its outlet end extends in the tangential direction of the wind wheel (4).

4. The automotive air-conditioning fan for dissipating heat from lithium batteries according to claim 1, characterized in that: The arc-shaped cross-section of the connecting ring (41) matches the arc of the hook groove (113).

5. The automotive air-conditioning fan for dissipating heat from lithium batteries according to claim 2, characterized in that: The cross section of the matching groove (61) of the first rubber gasket (6) is semicircular, and its radius is consistent with the width of the slot of the U-shaped slot (51); the cross section of the matching groove of the second rubber gasket (7) is trapezoidal, and its large end faces the outside of the base (2).

6. The automotive air-conditioning fan for dissipating heat from lithium batteries according to claim 1, characterized in that: The magnetic tile (323) is made of neodymium iron boron material and has a thickness of 2-5 mm. The rotary cover (322) is interference-fitted with the rotating shaft (321).

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