Aluminum alloy liquid cooling plate and heat dissipation structure for improving uniformity of blade battery pack

Abstract

The application relates to the technical field of battery packs, and discloses an aluminum alloy liquid cooling plate and a heat dissipation structure for improving the uniform temperature of a blade battery pack, which solves the problems of uneven distribution of flow channels, large contact thermal resistance and unadjustable inlet flow of the existing liquid cooling structure of the blade battery pack, and the problems of low uniform temperature and low heat dissipation efficiency; the aluminum alloy liquid cooling plate, a water outlet head, a water inlet head and a backing plate fixed at the bottom of the aluminum alloy liquid cooling plate are included; the aluminum alloy liquid cooling plate is an upper-lower composite plate structure, and three-stage flow channels are arranged in the aluminum alloy liquid cooling plate; the water inlet head is arranged at the two end positions of the aluminum alloy liquid cooling plate, and the water outlet head is arranged at the middle positions of the two sides of the aluminum alloy liquid cooling plate, so that symmetrical uniform temperature flow channels with liquid inlet at the two ends and liquid outlet at the middle are formed; the blade battery is mounted in the aluminum alloy liquid cooling plate, and a heat conduction bonding surface is arranged on the upper surface of the aluminum alloy liquid cooling plate; the application has excellent uniform temperature, high heat dissipation efficiency and precise control, and is suitable for the thermal management of blade battery packs of new energy vehicles and energy storage systems.

Description

Technical Field

[0001] This invention belongs to the field of battery pack technology, specifically an aluminum alloy liquid cooling plate and heat dissipation structure for improving the temperature uniformity of blade battery packs. Background Technology

[0002] The core function of the blade battery pack is to stably supply power to new energy vehicles and energy storage devices, ensuring power output and range, and adapting to the needs of daily driving, fast charging, and long-term energy storage. Its advantages include: firstly, outstanding safety performance, with lithium iron phosphate material resistant to high temperatures, less prone to thermal runaway, and strong resistance to compression and puncture; secondly, a streamlined structure, with integrated design reducing overall weight and improving interior space utilization; thirdly, a longer service life, high charge-discharge cycle count, and slow degradation; fourthly, excellent energy consumption control, reasonable energy density, effectively improving vehicle range; and finally, lower production costs, stronger low-temperature adaptability and environmental compatibility, resulting in outstanding overall practicality.

[0003] Existing liquid cooling structures generally suffer from the following defects:

[0004] 1) The flow channel layout is unreasonable, mostly with single-sided liquid inlet and outlet or simple serpentine flow channels, resulting in uneven flow distribution, weak local heat exchange, and large temperature difference;

[0005] 2) The liquid cooling plate only makes contact with the battery cell on one side at the bottom, resulting in high contact thermal resistance and low heat dissipation efficiency;

[0006] 3) The inlet lacks an active flow balancing mechanism, making it impossible to adjust the flow at both ends in real time according to operating conditions, and temperature uniformity is difficult to guarantee; therefore, this invention proposes an aluminum alloy liquid cooling plate and heat dissipation structure to improve the temperature uniformity of the blade battery pack, in order to overcome the shortcomings of the prior art. Summary of the Invention

[0007] In order to overcome the shortcomings of the prior art, the present invention provides an aluminum alloy liquid cooling plate and heat dissipation structure to improve the temperature uniformity of blade battery packs. This effectively solves the problems of uneven flow distribution, high contact thermal resistance, and unadjustable inlet flow in the liquid cooling structure of existing blade battery packs, which lead to low temperature uniformity and heat dissipation efficiency.

[0008] To achieve the above objectives, the present invention provides the following technical solution: an aluminum alloy liquid cooling plate and heat dissipation structure for improving the temperature uniformity of a blade battery pack, comprising an aluminum alloy liquid cooling plate, a water outlet, a water inlet, and a pad fixed to the bottom of the aluminum alloy liquid cooling plate; the aluminum alloy liquid cooling plate is an upper and lower composite plate structure with three-stage flow channels inside; the water inlet is located at both ends of the aluminum alloy liquid cooling plate, and the water outlet is located at the middle of both sides of the aluminum alloy liquid cooling plate, forming a symmetrical temperature uniform flow path with liquid inlet at both ends and liquid outlet at the middle; the blade battery is installed inside the aluminum alloy liquid cooling plate, and a thermally conductive bonding surface is provided on the upper surface of the aluminum alloy liquid cooling plate. The thermally conductive bonding surface adopts a continuous diamond-shaped boss structure to increase the contact heat exchange area and achieve close contact and heat exchange with the bottom surface of the blade battery.

[0009] At the end of the inlet head furthest from the aluminum alloy liquid cooling plate, a flow valve and a quick-connect fitting are sequentially fixedly installed via connecting pipes. The quick-connect fittings are used for quick connection to external heat exchange pipelines. A protective cover is fixedly installed on the outside of each inlet head, and a servo motor is fixedly installed inside the protective cover. The output ends of the two servo motors are connected to a transmission assembly. Six regulating vanes are set inside each inlet head. The transmission assembly is connected to the regulating vanes. When the servo motors are running, they drive the regulating vanes to rotate through the transmission assembly to adjust the opening and closing size, thereby achieving precise control of the coolant flow. The two servo motors and the two flow valves are all connected to an external PLC logic controller via a wireless transmission module to form a closed-loop flow control system.

[0010] Preferably, the three-stage flow channel includes a primary main flow channel, a secondary branch flow channel, and a tertiary micro flow channel, with each flow channel interconnected; wherein the primary main flow channel is directly connected to the two inlet heads, and the primary main flow channel, the secondary branch flow channel, and the tertiary micro flow channel are connected to the two outlet heads through connecting channels, thereby achieving uniform distribution and centralized convergence of coolant.

[0011] Preferably, the inner wall of each side plate is provided with a deep thermally conductive adhesive groove, and the deep thermally conductive adhesive groove is filled with thermally conductive gel. The thermally conductive gel forms a large-area surface contact heat exchange with the side of the blade battery, thereby reducing the interface thermal resistance.

[0012] Preferably, the transmission assembly includes a transmission shaft fixedly installed at the output end of the servo motor; an installation cylinder is fixedly installed in the middle position inside the water inlet head via three support legs; adjusting vanes are distributed in a ring at equal intervals on the outer periphery of the installation cylinder; the end of the adjusting vane away from the installation cylinder is rotated and positioned against the inner wall of the water inlet head via a rotating seat; one end of the transmission shaft passes through the water inlet head and extends into the installation cylinder; the two ends of the transmission shaft surface are rotated and positioned against the water inlet head and the installation cylinder respectively via a first sealing bearing and a second sealing bearing to ensure sealing performance and prevent coolant leakage.

[0013] Preferably, each mounting cylinder is equipped with a worm gear, and one end of the drive shaft is fixedly connected to the worm gear. A worm wheel is meshed with the upper part of the worm gear, and the side of the worm wheel away from the center of the mounting cylinder is rotatably connected to the inner wall of the mounting cylinder through a first positioning seat. A shaft is fixedly connected to the side of the worm wheel away from the first positioning seat, and a bevel gear disk is fixedly connected to the end of the shaft. The sides of the two bevel gear disks that are close to each other are rotatably positioned with the inner wall of the mounting cylinder through a second positioning seat. Six bevel gears are meshed with the outer surfaces of the bevel gear disks, and the six bevel gears are evenly distributed in a ring at equal intervals along the outer circumference of the bevel gear disks. The cooperation between the bevel gears and the bevel gear disks can realize steering transmission. A rotating shaft is fixedly connected to one side of each bevel gear, and the surface of the rotating shaft is rotatably connected to the mounting cylinder through a third sealed bearing. The end of the rotating shaft away from the bevel gear is fixedly connected to the corresponding adjusting blade to realize synchronous rotation and opening adjustment of the adjusting blade.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] (1) The aluminum alloy liquid cooling plate achieves uniform distribution of coolant across the entire area from the source of the flow field by using a symmetrical flow path with liquid inlet at both ends and liquid outlet in the middle, combined with a three-stage graded flow channel. It has low flow resistance and no heat exchange dead zone, which can control the overall temperature difference of the blade battery pack within a very small range, fundamentally solving the industry pain points of uneven heating and overheating at the end of long cells, and significantly improving the uniformity of battery temperature and operational consistency.

[0016] (2) The inlet head has a built-in servo motor driven worm gear and bevel gear synchronous adjustment mechanism, which can be used with PLC to realize intelligent closed-loop control of coolant flow. The flow at both ends is accurately balanced in real time, effectively suppressing flow deviation and local overheating. It can still dissipate heat stably under harsh conditions such as fast charging and high-rate discharge, greatly improving battery safety and cycle life.

[0017] (3) The liquid cooling plate adopts a continuous diamond-shaped boss thermal conductive bonding surface plus a side plate deep groove thermal conductive gel structure to form a double-sided heat exchange on the bottom and side, which greatly reduces the contact thermal resistance and improves the heat exchange efficiency; at the same time, the thermal conductive gel can compensate for the assembly gap and buffer the vibration stress, taking into account both efficient heat dissipation and structural protection, and is suitable for the complex vehicle environment. Attached Figure Description

[0018] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0019] In the attached diagram:

[0020] Figure 1 This is a schematic diagram of the aluminum alloy liquid cooling plate structure for the temperature uniformity of the blade battery pack of the present invention.

[0021] Figure 2 This is a schematic diagram of the internal structure of the aluminum alloy liquid cooling plate and water inlet head of the present invention.

[0022] Figure 3 This is a top-section schematic diagram of the aluminum alloy liquid cooling plate structure of the present invention;

[0023] Figure 4 For the present invention Figure 2 Enlarged structural diagram at point A in the middle;

[0024] Figure 5 This is a schematic diagram of the internal structure of the protective cover of the present invention;

[0025] Figure 6 This is a schematic diagram of the internal structure of the water inlet head of the present invention;

[0026] Figure 7 For the present invention Figure 6 Enlarged structural diagram at point B;

[0027] In the diagram: 1. Aluminum alloy liquid cooling plate; 2. Side plate; 3. Blade battery; 4. Water outlet; 5. Water inlet; 6. Connecting pipe; 7. Flow valve; 8. Quick connector; 9. Thermally conductive bonding surface; 10. Deep thermally conductive adhesive groove; 11. Thermally conductive gel; 12. Adjusting blade; 13. Protective cover; 14. Servo motor; 15. Drive shaft; 16. First sealed bearing; 17. Second sealed bearing; 18. Worm gear; 19. Worm wheel; 20. First positioning seat; 21. Shaft; 22. Bevel gear disc; 23. Bevel gear; 24. Third sealed bearing; 25. Rotating shaft; 26. Mounting cylinder; 27. Support leg; 28. Rotating seat; 29. ​​Primary main channel; 30. Secondary branch channel; 31. Tertiary microchannel; 32. Connecting channel; 33. Pad; 34. Second positioning seat. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029] Depend on Figure 1 , Figure 2 , Figure 4 as well as Figure 5The present invention includes an aluminum alloy liquid cooling plate 1, which is a composite plate structure formed by vacuum brazing the upper and lower plates and creating a three-stage flow channel inside. Water inlets 5 are located at both ends of the aluminum alloy liquid cooling plate 1, and water outlets 4 are located at the middle of both sides of the plate, forming a symmetrical, temperature-equalizing flow path with liquid entering at both ends and exiting at the middle. A blade battery 3 is installed inside the aluminum alloy liquid cooling plate 1, and its upper surface has a thermally conductive bonding surface 9. The thermally conductive bonding surface 9 has a continuous diamond-shaped boss structure, increasing the heat exchange contact area and tightly fitting with the large bottom surface of the blade battery 3 to achieve efficient bottom heat dissipation. The end of the water inlet 5 furthest from the aluminum alloy liquid cooling plate 1 is sequentially connected to a flow valve 7 and a quick connector 8 via a connecting pipe 6. The quick connector 8 is used for quick connection to an external cooling circuit.

[0030] A protective cover 13 is fixedly installed on the outside of the water inlet head 5, and a servo motor 14 is fixed inside the protective cover 13. The output ends of the two servo motors 14 are connected to a transmission assembly. Six adjusting vanes 12 are respectively set inside the water inlet head 5. The transmission assembly is connected to the adjusting vanes 12. When the servo motors 14 are running, they drive the adjusting vanes 12 to rotate through the transmission assembly, adjusting the opening and closing size to achieve precise control of the coolant flow. The two servo motors 14 and the two flow valves 7 are all connected to an external PLC logic controller via a wireless transmission module to achieve closed-loop automatic adjustment of temperature and flow.

[0031] Depend on Figure 2 and Figure 3 The three-stage flow channel consists of a primary main channel 29, a secondary branch channel 30, and a tertiary micro channel 31, which are connected sequentially and evenly distributed. The primary main channel 29 is directly connected to the two inlet heads 5. The primary main channel 29, the secondary branch channel 30, and the tertiary micro channel 31 are connected to the two outlet heads 4 through the connecting channel 32, so that the coolant enters from both ends and is gradually distributed to evenly cover the bottom of the battery, and finally flows out to the middle, ensuring uniform temperature throughout the entire area.

[0032] Deep thermally conductive adhesive grooves 10 are opened on the inner wall of the side plate 2. The grooves are filled with thermally conductive gel 11. The thermally conductive gel 11 is in full contact with the side of the blade battery 3 to form a surface contact heat exchange structure, reduce the interface thermal resistance, and achieve dual-sided heat dissipation of the bottom and the side.

[0033] Depend on Figure 4 , Figure 5 , Figure 6 as well as Figure 7 The transmission assembly includes a transmission shaft 15 fixedly installed at the output end of the servo motor 14; a mounting cylinder 26 is fixedly installed at the center position inside the water inlet head 5 via three support legs 27, and six adjusting blades 12 are distributed in a ring at equal distances around the mounting cylinder 26; the end of the adjusting blade 12 away from the mounting cylinder 26 is rotatably connected to the inner wall of the water inlet head 5 via a rotating seat 28, ensuring that the adjusting blade 12 rotates flexibly and is reliably positioned.

[0034] One end of the drive shaft 15 passes through the wall of the inlet head 5 and extends into the interior of the mounting cylinder 26. The two ends of the drive shaft 15 are respectively connected to the inlet head 5 and the mounting cylinder 26 through the first sealing bearing 16 and the second sealing bearing 17, forming a reliable seal to prevent coolant leakage. A worm gear 18 is installed inside the mounting cylinder 26, and the end of the drive shaft 15 is fixedly connected to the worm gear 18. The upper part of the worm gear 18 is meshed with a worm wheel 19. The side of the worm wheel 19 away from the center is rotatably connected to the inner wall of the mounting cylinder 26 through the first positioning seat 20, realizing speed reduction and torque increase and power reversal.

[0035] The worm gear 19 is fixedly connected to the shaft 21 on the side away from the first positioning seat 20, and the end of the shaft 21 is fixedly connected to the bevel gear 22; the side of the bevel gear 22 closest to the center is rotated and positioned with the inner wall of the mounting cylinder 26 through the second positioning seat 34, so as to ensure that the bevel gear 22 rotates smoothly and has high coaxiality.

[0036] The outer circumferential surface of the bevel gear disk 22 is respectively meshed with six bevel gears 23. The six bevel gears 23 are evenly distributed at equal intervals along the outer circumference of the bevel gear disk 22 to achieve single power input and multiple output synchronous drive. A rotating shaft 25 is fixedly connected to one side of each bevel gear 23. The surface of the rotating shaft 25 is rotatably connected to the mounting cylinder 26 through a third sealed bearing 24. The end of the rotating shaft 25 away from the bevel gear 23 is fixedly connected to the corresponding regulating vane 12, so that the rotational motion of the bevel gear 23 is synchronously converted into the opening and closing motion of the regulating vane 12, thereby achieving continuous and precise adjustment of the flow cross section.

[0037] When the cooling system is working, the coolant from the external heat exchanger enters the pipeline through quick connector 8, and is delivered to the water inlets 5 at both ends of the aluminum alloy liquid cooling plate 1 via flow valve 7 and connecting pipe 6. The external PLC logic controller, based on the flow signal transmitted by flow valve 7, controls the independent operation of the servo motors 14 at both ends via a wireless transmission module. The servo motors 14 drive the drive shaft 15 to rotate, which in turn drives the worm gear 18 and worm wheel 19 to mesh and drive the bevel gear disk 22 to rotate via shaft 21. The bevel gear disk 22 synchronously drives six bevel gears 23 to rotate, and the bevel gears 23, through rotating shaft 25, drive the adjusting vanes 12 to open and close synchronously around the rotating seat 28, precisely adjusting the water flow at both ends to maintain a balanced flow on both sides and avoid uneven flow and localized overheating.

[0038] After adjustment, the coolant enters the primary main channel 29, and is successively branched into the secondary branch channel 30 and the tertiary microchannel 31, forming a uniformly covered symmetrical flow field inside the aluminum alloy liquid cooling plate 1. During the flow, the coolant efficiently exchanges heat with the large bottom surface of the blade battery 3 through the continuous diamond-shaped protrusion thermally conductive bonding surface 9 on the upper surface of the liquid cooling plate; at the same time, the thermally conductive gel 11 in the deep thermally conductive adhesive groove 10 inside the side plate 2 is tightly bonded to the side of the blade battery 3, forming side auxiliary heat exchange, realizing double-sided heat dissipation from the bottom and sides.

[0039] After absorbing heat, the coolant converges towards the center through the connecting channel 32 and flows out uniformly from the outlets 4 on both sides of the aluminum alloy liquid cooling plate 1, completing one cycle of heat dissipation. During continuous circulation, the three-stage flow channel evenly distributes the flow, the regulating blade balances the flow in real time, and the double-sided heat conduction reduces thermal resistance. The combined effect of these three factors keeps the overall temperature of the blade battery pack highly consistent, effectively reducing temperature differences and improving battery safety, cycle life, and operational stability.

[0040] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An aluminum alloy liquid cooling plate and heat dissipation structure for improving the temperature uniformity of blade battery packs, comprising an aluminum alloy liquid cooling plate (1), a water outlet (4), a water inlet (5), and a pad (33) fixed to the bottom of the aluminum alloy liquid cooling plate (1), characterized in that: The aluminum alloy liquid cooling plate (1) is a composite plate structure with three-stage flow channels inside. The inlet head (5) is located at both ends of the aluminum alloy liquid cooling plate (1), and the outlet head (4) is located in the middle of both sides of the aluminum alloy liquid cooling plate (1), forming a symmetrical uniform temperature flow path with liquid inlet at both ends and liquid outlet in the middle. The blade battery (3) is installed inside the aluminum alloy liquid cooling plate (1). The upper surface of the aluminum alloy liquid cooling plate (1) is provided with a heat-conducting bonding surface (9). The heat-conducting bonding surface (9) has continuous diamond-shaped protrusions to increase the contact area, and it is tightly bonded to the bottom surface of the blade battery (3). The end of the inlet head (5) away from the aluminum alloy liquid cooling plate (1) is fixed with a flow valve (7) and a quick connector (8) in sequence through a connecting pipe (6). The heat exchanger pipe can be quickly connected through the quick connector (8). The inlet head (5) is also fixed with a protective cover (13). The protective cover (13) is fixed with a servo motor (14). The output end of the two servo motors (14) is equipped with a transmission component. The inlet head (5) is equipped with six regulating vanes (12). The transmission component is connected to the regulating vanes (12). When the servo motor (14) is running, the regulating vanes (12) can be driven to rotate through the transmission component to adjust the opening and closing size, so as to realize flow control. The two servo motors (14) and the two flow valves (7) are all connected to the external PLC logic controller through a wireless transmission module.

2. The aluminum alloy liquid cooling plate and heat dissipation structure for improving the temperature uniformity of blade battery packs according to claim 1, characterized in that: The flow channel includes a primary main channel (29), a secondary branch channel (30), and a tertiary micro channel (31), which are interconnected. The primary main channel (29) is directly connected to the two inlet heads (5), and the primary main channel (29), the secondary branch channel (30), and the tertiary micro channel (31) are connected to the two outlet heads (4) through a connecting channel (32).

3. The aluminum alloy liquid cooling plate and heat dissipation structure for improving the temperature uniformity of blade battery packs according to claim 1, characterized in that: The inner wall of each side plate (2) is provided with a deep thermally conductive adhesive groove (10), which is filled with thermally conductive gel (11) and forms a surface contact heat exchange with the side of the blade battery (3).

4. The aluminum alloy liquid cooling plate and heat dissipation structure for improving the temperature uniformity of blade battery packs according to claim 1, characterized in that: The transmission assembly includes two transmission shafts (15) that are respectively fixedly installed at the output ends of two servo motors (14), and the middle part of the inlet head (5) is fixed with a mounting cylinder (26) by three support legs (27). The adjusting blades (12) are distributed in a ring at equal distances on the surface of the mounting cylinder (26), and the end of the adjusting blade (12) away from the mounting cylinder (26) is rotated and positioned by a rotating seat (28) and the inner wall of the inlet head (5).

5. The aluminum alloy liquid cooling plate and heat dissipation structure for improving the temperature uniformity of blade battery packs according to claim 4, characterized in that: One end of the drive shaft (15) passes through the water inlet head (5) and extends into the interior of the mounting cylinder (26). Both ends of the drive shaft (15) are rotated and positioned with the water inlet head (5) and the mounting cylinder (26) respectively through the first sealing bearing (16) and the second sealing bearing (17), ensuring sealing capability.

6. The aluminum alloy liquid cooling plate and heat dissipation structure for improving the temperature uniformity of blade battery packs according to claim 5, characterized in that: The mounting cylinder (26) is equipped with a worm (18) inside. One end of the transmission shaft (15) is fixed to the worm (18). The upper part of the worm (18) is meshed with a worm wheel (19). The two worm wheels (19) are rotatably connected to the inside of the mounting cylinder (26) through the first positioning seat (20) on the side that is far away from each other.

7. The aluminum alloy liquid cooling plate and heat dissipation structure for improving the temperature uniformity of blade battery packs according to claim 6, characterized in that: The worm gear (19) is fixed with a shaft (21) on the side away from the first positioning seat (20). One end of the shaft (21) is fixed with a bevel gear (22). The two bevel gears (22) are rotated and positioned by the inner wall of the mounting cylinder (26) through the second positioning seat (34) on the side that is close to each other.

8. The aluminum alloy liquid cooling plate and heat dissipation structure for improving the temperature uniformity of blade battery packs according to claim 7, characterized in that: The surface of the bevel gear disk (22) is connected to six bevel gears (23), and the six bevel gears (23) are distributed in a ring at equal distances along the outer surface of the bevel gear disk (22).

9. The aluminum alloy liquid cooling plate and heat dissipation structure for improving the temperature uniformity of blade battery packs according to claim 8, characterized in that: A rotating shaft (25) is fixed on one side of each bevel gear (23). The surface of the rotating shaft (25) is rotatably connected to the mounting cylinder (26) through a third sealed bearing (24). The end of the rotating shaft (25) away from the bevel gear (23) is fixed to the corresponding adjusting blade (12).

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