A forced air cooling system for lithium ion battery packs

Abstract

The application discloses a kind of air cooling systems for lithium ion battery pack, it is related to lithium battery heat dissipation technical field.The shell includes battery box and cooling box, the inside of battery box is provided with battery rack, the inside of battery rack is provided with not less than one battery main body, the side of battery box is provided with air outlet at both ends, the end of cooling box away from battery box is provided with air inlet, for connecting fan, the air flow path between air inlet and two air outlets is Y type.Compared with the general Z type, U type and T type air-cooled battery thermal management system structure, the product retains the parallel flow structure of Z type and U type, the symmetrical flow field structure of T type, the air inlet and two air outlets are arranged along the height direction of battery main body, and the air inlet is between two air outlets, so as to shorten the airflow path, Y type airflow path structure will have better temperature uniformity and lower system power consumption.

Description

Technical Field

[0001] This invention relates to the field of lithium battery heat dissipation technology, specifically to an air-cooling system for lithium-ion battery packs. Background Technology

[0002] A square lithium battery is a type of battery. Lithium-ion batteries are classified by shape into square lithium batteries (such as commonly used mobile phone battery cells), cylindrical lithium batteries (such as 18650, 18500, etc.) and button lithium batteries; lithium batteries are classified by outer casing material into aluminum-cased lithium batteries, steel-cased lithium batteries, and pouch batteries; and by positive electrode material into lithium cobalt oxide, lithium iron phosphate, lithium manganese oxide, and lithium polymer.

[0003] Traditional Z-type, U-type, and T-type air-cooled battery thermal management system structures mostly rely on fans to draw air and deliver it to the air inlet. However, the excessively long airflow path causes the cooling air to become too hot near the outlet, making it difficult to continuously dissipate heat for the battery, resulting in unsatisfactory heat dissipation. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: a wind-cooling system for lithium-ion battery packs, comprising a housing, the housing including a battery box and a cooling box, a battery rack being provided inside the battery box, and at least one battery body being provided inside the battery rack, with air outlets at both ends of one side of the battery box, and an air inlet being provided at the end of the cooling box away from the battery box for connecting to a fan, the air flow path between the air inlet and the two air outlets being Y-shaped;

[0005] The cooling box has an air guide frame on one side for guiding air into the battery box and pressing the battery rack. The inner wall of the cooling box has a semiconductor cooling chip on both sides located on the air inlet side. The semiconductor cooling chip has a cooling fin and a heat dissipation fin on both sides respectively. The end of the heat dissipation fin away from the semiconductor cooling chip extends to the outside of the cooling box.

[0006] The cooling box has slots on both sides, and a dehumidifying rack is movably inserted into the slot. The dehumidifying rack has at least one heat-insulating shaft rotatably installed inside. The two ends of the heat-insulating shaft are located inside and outside the cooling box, respectively, and both ends of the heat-insulating shaft are covered with moisture-absorbing silicone. The cooling box has heat-conducting boxes on both sides, and the moisture-absorbing silicone and heat dissipation fins on both sides of the cooling box are located inside the two heat-conducting boxes, respectively.

[0007] As a preferred technical solution of the present invention, the cooling box is provided with an air duct inside, the number of air guide frames is two and the two air guide frames are respectively located on both sides of the air duct, the air guide frame is provided with an air guide cavity of not less than one, the air guide cavities on the two air guide frames are arranged opposite each other and the opposite ends are provided with air inlet oblique openings.

[0008] The air guide cavity has at least one exhaust hole on one side, and an auxiliary cooling cavity is provided inside the air guide frame between two adjacent air guide cavities. One end of the auxiliary cooling cavity has a strip-shaped air inlet.

[0009] As a preferred embodiment of the present invention, the battery rack includes at least one mounting slot, the battery body is movably inserted into the interior of the mounting slot, a T-shaped positioning frame is provided between two adjacent mounting slots opposite to the air guide cavity, the auxiliary cooling cavity is opposite to the battery body, at least one heat dissipation frame is provided on both sides of the T-shaped positioning frame, one end of the heat dissipation frame abuts against one side of the air guide frame, and the other end is provided with an air guide arc plate, the length of the multiple air guide arc plates located on both sides of the T-shaped positioning frame increases from the inside to the outside.

[0010] As a preferred embodiment of the present invention, the outer shell is Y-shaped, the dehumidification rack is I-shaped, the heat insulation shaft is rotatably mounted inside the dehumidification rack via a ceramic bearing, and at least one silicone column is evenly distributed around the moisture-absorbing silicone. T-shaped blocks are provided on both sides of the inner wall of the slot, and T-shaped grooves matching the T-shaped blocks are provided on both sides of the dehumidification rack.

[0011] The dehumidifier rack has rubber sealing rings on its top and bottom rings, and a sealing gasket is embedded in the inner wall of the slot. The rubber sealing rings and the sealing gasket are in contact with each other.

[0012] As a preferred embodiment of the present invention, a rotating shaft is provided inside the air duct at the air inlet, and rotating blades are provided around the rotating shaft. One end of the rotating shaft extends into the interior of the heat conduction box and is provided with fan blades. The fan blades are located on one side of the heat dissipation fins, and an air extraction filter is provided on one side of the heat conduction box for drawing air when the heat dissipation fins rotate.

[0013] As a preferred embodiment of the present invention, a partition is fixedly installed inside the air duct between two dehumidifier racks. Positioning blocks are movably installed on both sides of the top of the partition. Positioning grooves are opened on both sides of the top of the dehumidifier rack. One end of the positioning block is inserted into the positioning groove opposite to it. A pressure block for driving the two positioning blocks to reciprocate is movably installed on the top of the partition.

[0014] As a preferred embodiment of the present invention, both the air inlet and the air outlet are equipped with filters, and at least one guide plate is provided on the upper middle part of both sides of the cooling box. The bottom guide plate is L-shaped. An air outlet is provided on the top of one side of the heat conduction box. A guide frame located on the side of the air inlet is provided inside the air duct to guide the airflow to blow the rotating blades.

[0015] As a preferred embodiment of the present invention, it further includes a dehumidification mechanism, which is disposed inside the air duct and located between the dehumidification rack and the semiconductor cooling chip. The dehumidification mechanism includes a demisting plate, and the demisting plate has at least one arc-shaped baffle plate inside. The multiple arc-shaped baffle plates are connected by a fixed pipe. An overflow port is provided on one side of the fixed pipe, and a guide plate is also provided inside the fixed pipe above the overflow port.

[0016] As a preferred embodiment of the present invention, a baffle is provided at the bottom inner part of the demisting plate, a float rod is rotatably provided on one side of the baffle, and a valve rod located below the float rod is slidably provided on one side of the baffle. A connecting post is provided at the top of the valve rod, one end of which is slidably provided inside the float rod. A valve pad is provided at the bottom of the valve rod, and a drain hole covered by the valve pad is provided at the bottom of the cooling box.

[0017] As a preferred embodiment of the present invention, heat dissipation grooves are provided on both sides of the battery box, the battery box and the cooling box are locked together by bolts, a sealing ring is provided between the battery box and the cooling box, and a handle is provided on the top of the dehumidification rack.

[0018] Compared with the prior art, the present invention provides an air-cooling system for lithium-ion battery packs, which has the following advantages:

[0019] 1. Compared to the traditional Z-type, U-type, and T-type air-cooled battery thermal management system structures, this product retains the parallel flow pattern structure of Z-type and U-type, and the symmetrical flow field structure of T-type. The air inlet and two air outlets are arranged along the height direction of the battery body, and the air inlet is in the middle of the two air outlets, thereby shortening the airflow path. The Y-type airflow path structure will have better temperature uniformity and lower system power consumption.

[0020] 2. This lithium-ion battery pack uses an air-cooling system, which further reduces the temperature of the ambient air through a semiconductor cooling chip, and removes moisture from the air a second time through a dehumidification mechanism and dehumidification rack. This ensures that the air entering the battery box not only maintains a low temperature, but also avoids the impact of moisture on the battery body. In conjunction with the setting of multiple heat dissipation frames, the air can fully contact the battery body to dissipate heat, further ensuring the heat dissipation efficiency of the product.

[0021] 3. This lithium-ion battery pack uses an air-cooling system. As air enters the air duct, it drives the fan blades to rotate. The fan blades draw in external air and pass it through the heat dissipation fins. This not only dissipates heat from the heat dissipation fins, but also directs the heated air to the moisture-absorbing silica gel located outside the cooling box to dry the saturated silica gel. Compared to the natural drying of the moisture-absorbing silica gel, this design does not require an additional power source. It uses the heating surface of the semiconductor cooling chip to dry the dehumidifier rack, making it energy-efficient and compact and ingenious in structure. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an air-cooling system for a lithium-ion battery pack proposed in this invention;

[0023] Figure 2 This is a schematic diagram showing the heat-conducting box and cooling box of an air-cooling system for lithium-ion battery packs in a separated state, as proposed in this invention.

[0024] Figure 3 This is a schematic diagram of a moisture-absorbing silica gel structure for an air-cooling system for lithium-ion battery packs proposed in this invention.

[0025] Figure 4 This is a schematic diagram of the fan blade structure of an air-cooled system for lithium-ion battery packs proposed in this invention;

[0026] Figure 5 This is a schematic diagram of the slot structure of an air-cooling system for lithium-ion battery packs proposed in this invention;

[0027] Figure 6 This is a cross-sectional view of the compression block structure of an air-cooling system for lithium-ion battery packs proposed in this invention;

[0028] Figure 7 This is a top sectional view of the air guide cavity structure of an air-cooling system for lithium-ion battery packs proposed in this invention;

[0029] Figure 8 This is a side view of the air guide frame structure of an air-cooling system for lithium-ion battery packs proposed in this invention;

[0030] Figure 9 This is a cross-sectional view of the dehumidification mechanism of an air-cooled system for lithium-ion battery packs proposed in this invention.

[0031] Figure 10 This is a cross-sectional view of an arc-shaped baffle structure for an air-cooled system for lithium-ion battery packs proposed in this invention.

[0032] Figure 11 This is a cross-sectional view of the float rod structure of an air-cooling system for lithium-ion battery packs proposed in this invention;

[0033] Figure 12This is a cross-sectional view of the air inlet structure of an air-cooling system for lithium-ion battery packs proposed in this invention.

[0034] Figure 13 This is a schematic diagram of the air outlet structure of an air-cooled system for lithium-ion battery packs proposed in this invention.

[0035] In the diagram: 1. Outer casing; 2. Battery box; 21. Battery rack; 211. Mounting slot; 22. Battery body; 23. Air outlet; 24. T-shaped positioning frame; 25. Heat dissipation frame; 26. Air guide arc plate; 27. Heat dissipation groove; 28. Sealing ring; 3. Cooling box; 301. Guide plate; 31. Air inlet; 32. Air guide frame; 321. Air guide cavity; 322. Slanted air inlet; 323. Exhaust hole; 324. Strip-shaped air outlet; 33. Semiconductor cooling chip; 331. Heat dissipation fins; 34. Slot; 341. T-block; 342. Sealing gasket; 35. Dehumidifier rack; 351. Heat insulation shaft; 352. Moisture-absorbing silica gel; 353. Silica gel column; 354. Rubber sealing ring; 355. Handle; 356. Positioning groove; 36. Heat conduction box; 361. Air outlet; 362. Air extraction filter; 37. Air duct; 371. Guide frame; 38. Rotating shaft; 381. Rotating blade; 382. Fan blade; 39. Partition; 391. Positioning block; 392. Pressure block; 4. Dehumidification mechanism; 41. Demister plate; 42. Arc-shaped baffle plate; 43. Fixed pipe; 44. Overflow port; 45. Guide plate; 46. Baffle; 47. Float rod; 48. Valve stem; 481. Valve gasket; 49. Connecting column. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figure 1-13 A cooling system for lithium-ion battery packs includes a housing 1, which includes a battery box 2 and a cooling box 3. The battery box 2 has a battery rack 21 inside, and the battery rack 21 has at least one battery body 22 inside. Both ends of one side of the battery box 2 have air outlets 23. The cooling box 3 has an air inlet 31 at the end away from the battery box 2 for connecting a fan. The air flow path between the air inlet 31 and the two air outlets 23 is Y-shaped.

[0038] The cooling box 3 has an air guide frame 32 on one side for guiding air into the battery box 2 and pressing the battery rack 21. The inner wall of the cooling box 3 has a semiconductor cooling chip 33 on both sides located on the side of the air inlet 31. The semiconductor cooling chip 33 has a cooling fin and a heat dissipation fin 331 on both sides. The end of the heat dissipation fin 331 away from the semiconductor cooling chip 33 extends to the outside of the cooling box 3.

[0039] The cooling box 3 has slots 34 on both sides, and a dehumidifying rack 35 is movably inserted into the slot 34. The dehumidifying rack 35 has at least one heat-insulating shaft 351 rotatably installed inside. The two ends of the heat-insulating shaft 351 are located inside and outside the cooling box 3, respectively, and both ends of the heat-insulating shaft 351 are covered with moisture-absorbing silicone 352. The cooling box 3 has heat-conducting boxes 36 on both sides, and the moisture-absorbing silicone 352 and heat dissipation fins 331 on both sides of the cooling box 3 are located inside the two heat-conducting boxes 36, respectively.

[0040] As a specific technical solution in this embodiment, the cooling box 3 is provided with an air duct 37 inside. There are two air guide frames 32, each located on one side of the air duct 37. Each air guide frame 32 has at least one air guide cavity 321 inside. The air guide cavities 321 on the two air guide frames 32 are arranged opposite each other, and each opposite end has an air inlet slant 322. Each air guide cavity 321 has at least one exhaust hole 323 on one side. An auxiliary cooling cavity is also provided inside the air guide frame 32 between two adjacent air guide cavities 321. One end of the auxiliary cooling cavity has a strip-shaped air inlet 324. A fan is connected to the air inlet 31 to supply air, activating the semiconductor cooling chip 33. The cooling surface of the semiconductor cooling chip 33 lowers the temperature of the cooling fins. The air temperature decreases after passing through the cooling fins. The cooled air is then dehumidified before entering the battery box 2. (See reference...) Figure 7 and Figure 8 The size of the air inlet slant 322 is larger than that of the strip air inlet 324. The auxiliary cooling chamber is only used to dissipate heat on the two smaller sides of the battery body 22, so that most of the air enters the interior of the air guide chamber 321 through the air inlet slant 322, and a small part of the air enters the interior of the auxiliary cooling chamber through the strip air inlet 324.

[0041] As a specific technical solution in this embodiment, the battery rack 21 includes at least one mounting slot 211. The battery body 22 is movably inserted into the interior of the mounting slot 211. A T-shaped positioning frame 24 opposite to the air guide cavity 321 is provided between two adjacent mounting slots 211. The auxiliary cooling cavity is opposite to the battery body 22. At least one heat dissipation frame 25 is provided on both sides of the T-shaped positioning frame 24. One end of the heat dissipation frame 25 abuts against one side of the air guide frame 32, and the other end is provided with an air guide arc plate 26. The lengths of the multiple air guide arc plates 26 located on both sides of the T-shaped positioning frame 24 increase from the inside to the outside. (See reference...) Figure 7 The T-shaped positioning frame 24 supports two adjacent mounting slots 211 and directs the airflow to the two air outlets 23. The T-shaped positioning frame 24 is opposite to the air guide cavity 321, allowing the air exhausted from the exhaust port to directly enter between the two mounting slots 211, providing large-area heat dissipation to the bottom and underside of the battery body 22. The heat dissipation frame 25 guides the air exhausted from the exhaust port, ensuring sufficient contact between the air and the two mounting slots 211, guaranteeing efficient heat dissipation. (See reference...) Figure 7 The multiple air guide arc plates 26 have different lengths, which ensures that the multiple air guide arc plates 26 do not interfere with each other when exhausting air to the air outlet 23, thus ensuring exhaust efficiency.

[0042] As a specific technical solution in this embodiment, the outer shell 1 is Y-shaped, the dehumidifier rack 35 is I-shaped, the heat insulation shaft 351 is rotatably mounted inside the dehumidifier rack 35 via a ceramic bearing, the moisture-absorbing silica gel 352 has at least one silica gel pillar 353 evenly distributed around its circumference, T-shaped blocks 341 are provided on both sides of the inner wall of the slot 34, and T-shaped grooves matching the T-shaped blocks 341 are provided on both sides of the dehumidifier rack 35. Rubber sealing rings 354 are provided on the top and bottom circumferences of the dehumidifier rack 35, and a sealing gasket 342 is embedded in the inner wall of the slot 34, with the rubber sealing ring 354 fitting snugly against the sealing gasket 342. (See reference...) Figure 1 The outer casing 1 is Y-shaped. The Y-shaped casing 1, combined with the Y-shaped airflow path, simplifies the structure and further reduces the space occupied by the casing 1. The ceramic bearing effectively isolates heat transfer, reducing the heat transfer from the section of the heat-insulating shaft 351 located outside the cooling box 3 to the section inside, thus preventing any temperature rise interference with the air inside the air duct 37. (See reference...) Figure 2 and Figure 3 The silica gel column 353, in conjunction with the moisture-absorbing silica gel 352, effectively absorbs moisture from the air, ensuring that the air entering the battery compartment 2 remains at a low temperature. This prevents moisture from corroding the battery body 22, making it safer to use. (See reference...) Figure 3 and Figure 5The rubber sealing ring 354, together with the sealing gasket 342, ensures the sealing of the connection between the dehumidifier rack 35 and the slot 34, preventing air leakage. The T-block 341 and T-slot design make it easy to remove the dehumidifier rack 35. Simply lift the dehumidifier rack 35 to disengage the T-slot from the T-block 341. The operation is simple and quick, making it convenient for users to operate later.

[0043] As a specific technical solution in this embodiment, a rotating shaft 38 is provided inside the air duct 37 at the air inlet 31. Rotating blades 381 are arranged around the rotating shaft 38. One end of the rotating shaft 38 extends into the interior of the heat conduction box 36 and is provided with fan blades 382. The fan blades 382 are located on one side of the heat dissipation fins 331. An air extraction filter 362 is provided on one side of the heat conduction box 36 for drawing air when the heat dissipation fins 331 rotate. The arrangement of the rotating blades 381 ensures that when the fan delivers air to the air inlet 31, the air drives the rotating blades 381 to rotate. The rotating blades 381 then drive the fan blades 382 to rotate via the rotating shaft 38. (See reference...) Figure 1 and Figure 2 The fan blades 382 draw in external air through the air extraction filter 362 for filtration. Since the heat dissipation fins 331 correspond to the heating surface of the semiconductor cooling chip 33, the temperature of the heat dissipation fins 331 is relatively high. The filtered air is heated by the heat dissipation fins 331 and continues to flow to the moisture-absorbing silica gel 352 and silica gel pillars 353 located outside the air duct 37. This allows the moisture-absorbing silica gel 352 and silica gel pillars 353, which originally contained moisture, to be dried by the hot air. Once the moisture-absorbing silica gel 352 and silica gel pillars 353 inside the air duct 37 are saturated, the dehumidifier rack 35 can be lifted out and its direction changed for use, which facilitates later maintenance.

[0044] As a specific technical solution in this embodiment, a partition 39 is fixedly installed inside the air duct 37 between two dehumidifier racks 35. Positioning blocks 391 are movably installed on both sides of the top of the partition 39. Positioning grooves 356 are opened on both sides of the top of each dehumidifier rack 35. One end of each positioning block 391 is inserted into its corresponding positioning groove 356. A pressure block 392 is movably installed on the top of the partition 39 to drive the two positioning blocks 391 to reciprocate. (See reference...) Figure 5 and Figure 6A spring is provided between the positioning blocks 391 on both sides of the partition 39. The partition 39 is used to separate the two dehumidification racks 35 and provide a locking position for the two dehumidification racks 35, while ensuring the structural strength of the cooling box 3. When installing the dehumidification rack 35, press the pressure block 392. The pressure block 392 descends and drives the positioning blocks 391 on both sides of the partition 39 to retract into the partition 39. The dehumidification rack 35 can then be inserted into the slot 34. The T-shaped block 341 and the T-shaped slot are aligned and inserted. Release the pressure block 392 so that the positioning block 391 is springed back by the spring and inserted into the positioning groove 356, thus completing the positioning of the dehumidification rack 35.

[0045] As a specific technical solution in this embodiment, both the air inlet 31 and the air outlet 23 are equipped with filters. At least one guide plate 301 is provided on the upper middle part of both sides of the cooling box 3. The lowest guide plate 301 is L-shaped. An air outlet 361 is opened on the top of one side of the heat conduction box 36. A guide frame 371 located on one side of the air inlet 31 is provided inside the air duct 37 to guide the airflow and drive the rotating blades 381. The filters can filter the air flowing through the air inlet 31 and the air outlet 23. The guide plates 301 are located on the upper middle part of both sides of the cooling box 3. The L-shaped guide plate 301 is used to guide most of the heated air to the bottom of the dehumidifier rack 35. The hot air dries the moisture-absorbing silica gel 352 on the dehumidifier rack 35 from the bottom upwards, ensuring the drying efficiency of the moisture-absorbing silica gel 352 and the silica gel column 353. Compared with the natural drying of the moisture-absorbing silica gel 352, this design does not require an additional power source. It dries the dehumidifier rack 35 by utilizing the heating surface of the semiconductor cooling chip 33. It is energy-saving and has a compact and ingenious structure. The air outlet 361 is located on the top of one side of the heat conduction box 36, and the hot air flows upwards naturally, reducing interference with the surrounding environment.

[0046] As a specific technical solution of this embodiment, a dehumidification mechanism 4 is also included. The dehumidification mechanism 4 is disposed inside the air duct 37 and located between the dehumidification rack 35 and the semiconductor cooling chip 33. The dehumidification mechanism 4 includes a demister plate 41, and the demister plate 41 has at least one arc-shaped baffle plate 42 disposed inside it. The multiple arc-shaped baffle plates 42 are connected by a fixed pipe 43. An overflow port 44 is opened on one side of the fixed pipe 43, and a guide plate 45 is also opened above the overflow port 44 inside the fixed pipe 43. The dehumidification mechanism 4 is also disposed between the dehumidification rack 35 and the semiconductor cooling chip 33 to perform a primary dehumidification operation on the air. The dehumidification rack 35 is used to perform a secondary dehumidification operation on the air. The two dehumidification operations can effectively remove moisture from the air, so that the air delivered to the battery box 2 is kept at a low temperature and dry, reducing the impact on the battery body 22. See reference. Figure 9 and Figure 10The arc-shaped baffle 42, in contact with the air, can effectively absorb moisture from the air. The moisture concentrates along the curve of the arc-shaped baffle 42 at its concave area. The fixed pipe 43 is located at the concave area of ​​the arc-shaped baffle 42, and the overflow port 44 of the fixed pipe 43 faces the same direction as the airflow inside the duct 37, thus not creating air resistance. Simultaneously, the fixed pipe 43 can also absorb moisture when in contact with the air, further ensuring the dehumidification efficiency of the product. (See reference...) Figure 10 The baffle plate 45 effectively prevents water from overflowing from the overflow port when it flows downward inside the fixed pipe 43.

[0047] As a specific technical solution in this embodiment, a baffle 46 is provided at the bottom inner side of the demisting plate 41. A float rod 47 is rotatably provided on one side of the baffle 46. A valve rod 48 located below the float rod 47 is also slidably provided on one side of the baffle 46. A connecting post 49 is provided at the top of the valve rod 48, with one end slidably disposed inside the float rod 47. A valve pad 481 is provided at the bottom of the valve rod 48. A drain hole covered by the valve pad 481 is opened at the bottom of the cooling box 3. The baffle 46, together with the air duct 37, forms a water storage cavity at the bottom inner side of the air duct 37. Water vapor attached to the arc-shaped baffle 42 flows into the interior of the water storage cavity through the fixed pipe 43. When the water level rises to the point that it causes the float rod 47 to flip, the float rod 47 pulls the valve rod 48 through the connecting post 49. The valve rod 48 causes the valve pad 481 to disengage from the drain hole, allowing the water inside the water storage cavity to drain out. This automatic drainage design makes the process more convenient.

[0048] As a specific technical solution in this embodiment, heat dissipation grooves 27 are provided on both sides of the battery box 2. The battery box 2 and the cooling box 3 are locked together by bolts. A sealing ring 28 is also provided between the battery box 2 and the cooling box 3. A handle 355 is provided on the top of the dehumidification rack 35. Thermally conductive silicone pads are provided on both sides of the inner wall of the battery box 2. (See reference...) Figure 7 After the battery rack 21 is installed inside the battery box 2, the two sides of the battery rack 21 are attached to the thermally conductive silicone pads. Together with the heat dissipation grooves 27 on both sides of the battery box 2, the heat on the battery rack 21 can be dissipated through the heat dissipation grooves 27 on both sides of the battery box 2, which further ensures the cooling effect of the product. The battery box 2 and the cooling box 3 are locked together by bolts, which facilitates the replacement later. The handle 355 makes it easy for users to lift the dehumidifier rack 35. The sealing ring 28 ensures the sealing between the battery box 2 and the cooling box 3.

[0049] In use, connect the fan outlet 23 to the air inlet 31, start the fan to deliver air into the air inlet 31. The air first drives the rotating blades 381 to rotate, which in turn drives the fan blades 382 to rotate, activating the thermoelectric cooler 33. The cooling surface of the thermoelectric cooler 33 lowers the temperature of the cooling fins, while the heating surface of the thermoelectric cooler 33 transfers heat to the heat dissipation fins 331. After the air passes through the cooling fins, its temperature decreases. Subsequently, the air enters the dehumidification mechanism 4 to begin primary dehumidification. The arc-shaped baffle 42 comes into contact with the air and can effectively adsorb moisture in the air. The moisture is concentrated along the curvature of the arc-shaped baffle 42. The fixed pipe 43 is located in the concave part of the arc-shaped baffle 42. Water collected in the concave part enters the interior of the fixed pipe 43 through the overflow port 44. The baffle 46, together with the air duct 37, forms a water storage cavity at the bottom of the air duct 37. Water vapor adhering to the arc-shaped baffle 42 flows into the interior of the water storage cavity through the fixed pipe 43. When the water level rises to the point that it causes the float rod 47 to flip, the float rod 47 pulls the valve rod 48 through the connecting column 49. The valve rod 48 causes the valve pad 481 to disengage from the drain hole, allowing the water inside the water storage cavity to be discharged. The air dehumidified by the dehumidification mechanism 4 is diverted by the partition 39 to the two dehumidification racks 35. The hygroscopic silica gel 352 and silica gel pillars 353 come into contact with the air, absorbing moisture from it. Simultaneously, as air passes through the hygroscopic silica gel 352, it causes the internal heat-insulating shaft 351 to rotate. The airflow from the fan blades 382 also drives the hygroscopic silica gel 352 to rotate. This design ensures effective contact between the hygroscopic silica gel 352 inside the air duct 37 and the air, further guaranteeing dehumidification efficiency. It also ensures effective contact between the hygroscopic silica gel 352 outside the cooling box 3 and the air, further guaranteeing drying efficiency. Because the size of the inclined air inlet 322 is larger than the strip-shaped air inlet 324, and the auxiliary cooling chamber is only used for the battery body... The two smaller sides of the battery body 22 are used for heat dissipation. Most of the air passing through the dehumidification rack 35 enters the interior of the air guide cavity 321 through the air inlet 322, and a small part of the air enters the interior of the auxiliary cooling cavity through the strip-shaped air inlet 324. The T-shaped positioning frame 24 is opposite to the air guide cavity 321. The air discharged from the exhaust port on one side of the air guide cavity 321 can directly enter between the two mounting slots 211 to dissipate heat over a large area at the bottom and bottom of the battery body 22. The setting of the heat dissipation frame 25 can guide the air discharged from the exhaust port, so that the air can fully contact the two mounting slots 211, ensuring heat dissipation efficiency. Finally, the air is discharged through the air outlet 23.

[0050] When the fan blades 382 rotate, they draw in external air through the air extraction filter 362 for filtration. Since the heat dissipation fins 331 correspond to the heating surface of the semiconductor cooling chip 33, the temperature of the heat dissipation fins 331 is relatively high. The filtered air is heated by the heat dissipation fins 331 and continues to flow to the moisture-absorbing silica gel 352 and silica gel pillars 353 located outside the air duct 37. This allows the moisture-absorbing silica gel 352 and silica gel pillars 353, which originally contained moisture, to be dried by the hot air. Once the moisture-absorbing silica gel 352 and silica gel pillars 353 inside the air duct 37 are saturated, the dehumidifier rack 35 can be lifted out and its direction reversed for use. Pressing the pressure block 392 causes the pressure block 392 to descend, causing the positioning blocks 391 on both sides of the partition 39 to retract into the partition 39. At the same time, the positioning blocks 391 disengage from the inside of the positioning groove 356, and the dehumidifier rack 35 can be pulled out using the handle 355.

[0051] In summary, compared to the traditional Z-type, U-type, and T-type air-cooled battery thermal management system structures, this lithium-ion battery pack air-cooling system retains the parallel flow pattern structure of the Z-type and U-type systems and the symmetrical flow field structure of the T-type system. The air inlet 31 and two air outlets 23 are arranged along the height direction of the battery body 22, with the air inlet 31 located between the two air outlets 23, thereby shortening the airflow path. The Y-type airflow path structure will have better temperature uniformity and lower system power consumption.

[0052] The lithium-ion battery pack uses an air-cooling system, which further reduces the temperature of the ambient air through a semiconductor cooling chip 33, and removes moisture from the air a second time through a dehumidification mechanism 4 and a dehumidification rack 35. This ensures that the air entering the battery box 2 can not only maintain a low temperature, but also avoids the impact of moisture on the battery body 22. With the setting of multiple heat dissipation frames 25, the air can fully contact the battery body 22 to dissipate heat, further ensuring the heat dissipation efficiency of the product.

[0053] This lithium-ion battery pack uses an air-cooling system. Air enters the air duct 37 and drives the fan blades 382 to rotate. The fan blades 382 draw in external air and pass it through the heat dissipation fins 331. This not only dissipates heat from the heat dissipation fins 331, but also directs the heated air to the moisture-absorbing silica gel 352 located outside the cooling box 3. This saturates the moisture-absorbing silica gel 352 and dries it. Compared to the natural drying of the moisture-absorbing silica gel 352, this design does not require an additional power source. It uses the heating surface of the semiconductor cooling chip 33 to dry the dehumidifier rack 35, making it energy-efficient and compact and ingenious.

[0054] It should be noted that, in this document, terms such as "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 a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0055] 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. A cooling system for lithium-ion battery packs, comprising a housing (1), characterized in that: The outer casing (1) includes a battery box (2) and a cooling box (3). The battery box (2) is provided with a battery rack (21) inside. The battery rack (21) is provided with at least one battery body (22) inside. Both ends of one side of the battery box (2) are provided with air outlets (23). The end of the cooling box (3) away from the battery box (2) is provided with an air inlet (31) for connecting a fan. The air flow path between the air inlet (31) and the two air outlets (23) is Y-shaped. A guide frame (32) for guiding air into the battery box (2) and pressing the battery rack (21) is provided on one side of the cooling box (3). A semiconductor cooling chip (33) located on the side of the air inlet (31) is provided on both sides of the inner wall of the cooling box (3). Cooling fins and heat dissipation fins (331) are respectively provided on both sides of the semiconductor cooling chip (33). The end of the heat dissipation fin (331) away from the semiconductor cooling chip (33) extends to the outside of the cooling box (3). Slots (34) are provided on both sides of the cooling box (3). A dehumidifying rack (35) is movably inserted into the slot (34). At least one heat insulation shaft (351) is rotatably arranged inside the dehumidifying rack (35). The two ends of the heat insulation shaft (351) are located inside and outside the cooling box (3) respectively, and both ends of the heat insulation shaft (351) are covered with moisture-absorbing silicone (352). The cooling box (3) is provided with heat conduction boxes (36) on both sides. The moisture-absorbing silica gel (352) and heat dissipation fins (331) on both sides of the cooling box (3) are located inside the two heat conduction boxes (36). The cooling box (3) is provided with an air duct (37). There are two air guide frames (32) and the two air guide frames (32) are located on both sides of the air duct (37). The air guide frame (32) is provided with at least one air guide cavity (321). The air guide cavities (321) on the two air guide frames (32) are arranged opposite each other and the opposite ends are provided with air inlet oblique openings (322). At least one exhaust hole (323) is provided on one side of the air guide cavity (321). An auxiliary cooling cavity is also provided inside the air guide frame (32) between two adjacent air guide cavities (321). One end of the auxiliary cooling cavity is provided with a strip-shaped air inlet (324). The battery rack (21) includes at least one mounting slot (211). The battery body (22) is movably inserted into the interior of the mounting slot (211). A T-shaped positioning frame (24) opposite to the air guide cavity (321) is provided between two adjacent mounting slots (211). The auxiliary cooling cavity is opposite to the battery body (22). At least one heat dissipation frame (25) is provided on both sides of the T-shaped positioning frame (24). One end of the heat dissipation frame (25) abuts against one side of the air guide frame (32), and the other end is provided with an air guide arc plate (26). The lengths of the multiple air guide arc plates (26) located on both sides of the T-shaped positioning frame (24) increase from the inside to the outside.

2. The air-cooling system for lithium-ion battery packs according to claim 1, characterized in that: The outer shell (1) is Y-shaped, the dehumidifier rack (35) is I-shaped, the heat insulation shaft (351) is rotatably mounted inside the dehumidifier rack (35) via a ceramic bearing, and at least one silicone column (353) is evenly distributed around the moisture-absorbing silicone (352). T-shaped blocks (341) are provided on both sides of the inner wall of the slot (34), and T-shaped grooves matching the T-shaped blocks (341) are opened on both sides of the dehumidifier rack (35). The dehumidifier rack (35) is provided with rubber sealing rings (354) on the top and bottom rings, and a sealing gasket (342) is embedded on the inner wall of the slot (34). The rubber sealing ring (354) and the sealing gasket (342) are in contact.

3. The air-cooling system for lithium-ion battery packs according to claim 1, characterized in that: Inside the air duct (37), a rotating shaft (38) is provided at the air inlet (31). Rotating blades (381) are provided around the rotating shaft (38). One end of the rotating shaft (38) extends into the interior of the heat conduction box (36) and is provided with fan blades (382). The fan blades (382) are located on one side of the heat dissipation fins (331). An air extraction filter (362) is provided on one side of the heat conduction box (36).

4. The air-cooling system for lithium-ion battery packs according to claim 1, characterized in that: The air duct (37) is fixedly provided with a partition (39) located between two dehumidifier racks (35). Positioning blocks (391) are movably provided on both sides of the top of the partition (39). Positioning grooves (356) are provided on both sides of the top of the dehumidifier rack (35). One end of the positioning block (391) is inserted into the positioning groove (356) opposite to it. A pressure block (392) for driving the two positioning blocks (391) to reciprocate is movably provided on the top of the partition (39).

5. The air-cooling system for a lithium-ion battery pack according to claim 4, characterized in that: The air inlet (31) and air outlet (23) are both equipped with filters. The upper middle part of both sides of the cooling box (3) is equipped with at least one guide plate (301). The bottom guide plate (301) is L-shaped. The top of one side of the heat conduction box (36) is provided with an air outlet (361). The air duct (37) is equipped with a guide frame (371) located on one side of the air inlet (31) to guide the airflow to blow the rotating blades (381).

6. The air-cooling system for a lithium-ion battery pack according to claim 1, characterized in that: It also includes a dehumidification mechanism (4), which is located inside the air duct (37) and between the dehumidification rack (35) and the semiconductor cooling chip (33). The dehumidification mechanism (4) includes a demister plate (41), and the demister plate (41) has at least one arc-shaped baffle plate (42) inside. The multiple arc-shaped baffle plates (42) are connected to each other by a fixed pipe (43). An overflow port (44) is provided on one side of the fixed pipe (43), and a guide plate (45) is also provided inside the fixed pipe (43) above the overflow port (44).

7. The air-cooling system for a lithium-ion battery pack according to claim 6, characterized in that: The bottom of the defogger plate (41) is provided with a baffle (46), a float rod (47) is rotatably provided on one side of the baffle (46), and a valve rod (48) located below the float rod (47) is also slidably provided on one side of the baffle (46). A connecting column (49) is provided at the top of the valve rod (48) and one end is slidably provided inside the float rod (47). A valve pad (481) is provided at the bottom of the valve rod (48), and a drain hole covered by the valve pad (481) is opened at the bottom of the cooling box (3).

8. The air-cooling system for a lithium-ion battery pack according to claim 1, characterized in that: The battery box (2) has heat dissipation slots (27) on both sides. The battery box (2) and the cooling box (3) are locked together by bolts. A sealing ring (28) is also provided between the battery box (2) and the cooling box (3). A handle (355) is provided on the top of the dehumidification rack (35).

Images