A battery pack

Abstract

The application discloses a battery pack, comprising a shell, a battery module, a liquid cooling assembly, a fin assembly and a fan assembly, the battery module, the liquid cooling assembly, the fin assembly and the fan assembly are all arranged in the shell, the liquid cooling assembly is located below the battery module along a first direction, the fin assembly is located on a side of the liquid cooling assembly away from the liquid cooling assembly along the first direction, and the fan assembly is located above the battery module along the first direction. The fin assembly has a first air inlet, a second air inlet, a first air outlet and a second air outlet, the first air inlet and the second air inlet are respectively located on two sides of the fin assembly along a second direction, and the first air outlet and the second air outlet are respectively located on two sides of the fin assembly along a third direction. The fan assembly is configured to blow air towards the battery module, so that part of the airflow in the shell enters the first air inlet, part of the airflow enters the second air inlet, and air is blown out from the first air outlet and the second air outlet respectively.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery pack. Background Art

[0002] With the development of new energy technologies, the requirements for all aspects of battery pack performance are becoming increasingly higher, but the problem of uniform temperature and heat dissipation within the battery pack has always been a challenge that the industry has been unable to overcome. Summary of the Invention

[0003] An object of the present invention is to provide a battery pack, which aims to reduce the temperature difference between each battery cell in the battery pack and improve the heat dissipation efficiency.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a solution: a battery pack, comprising a shell, a battery module, a liquid cooling assembly, a fin assembly and a fan assembly, wherein the battery module, the liquid cooling assembly, the fin assembly and the fan assembly are all arranged in the shell. The liquid cooling assembly is located below the battery module along the first direction, the fin assembly is located on the side of the liquid cooling assembly away from the liquid cooling assembly along the first direction, the fin assembly has a first air inlet, a second air inlet, a first air outlet and a second air outlet, the first air inlet and the second air inlet are respectively located on both sides of the fin assembly along the second direction, the first air outlet and the second air outlet are respectively located on both sides of the fin assembly along the third direction, the first air outlet is respectively connected to the first air inlet and the second air inlet, the second air outlet is respectively connected to the first air inlet and the second air inlet, and any two of the first direction, the second direction and the third direction are perpendicular to each other. The fan assembly is located on a side of the battery module away from the liquid cooling assembly along the first direction, and the fan assembly is configured to blow air toward the battery module so that part of the air flow in the shell enters the first air inlet, part of the air flow enters the second air inlet, and is blown out from the first air outlet and the second air outlet respectively.

[0005] Optionally, when viewed along the first direction, the fan assembly is located in the middle of the battery module along the second direction.

[0006] Optionally, the first air inlet includes a first sub-air inlet and a second sub-air inlet, and the second air inlet includes a third sub-air inlet and a fourth sub-air inlet. The fin assembly further includes a first air duct, a second air duct, a third air duct, and a fourth air duct, wherein the first air duct connects the first sub-air inlet and the first air outlet, the second air duct connects the second sub-air inlet and the second air outlet, the third air duct connects the third sub-air inlet and the second air outlet, and the second air duct connects the fourth sub-air inlet and the first air outlet.

[0007] Optionally, at least one of the first air duct, the second air duct, the third air duct and the fourth air duct includes an arc segment.

[0008] Optionally, the first air duct includes a first arc-shaped segment, and the fin assembly further has a first blocking area, and the first blocking area is located on the center side of the first arc-shaped segment.

[0009] Optionally, the second air duct includes a second arc-shaped segment, and the fin assembly further has a second blocking area, and the second blocking area is located on the center side of the second arc-shaped segment.

[0010] Optionally, the third air duct includes a third arc-shaped segment, and the fin assembly further has a third blocking area, and the third blocking area is located on the center side of the third arc-shaped segment.

[0011] Optionally, the fourth air duct includes a fourth arc-shaped segment, and the fin assembly further has a fourth blocking area, and the fourth blocking area is located on the center side of the fourth arc-shaped segment.

[0012] Optionally, along the third direction, the first sub-air inlet and the second sub-air inlet are respectively located on both sides of the center line of the battery module, and the third sub-air inlet and the fourth sub-air inlet are respectively located on both sides of the center line of the battery module.

[0013] Optionally, the battery pack further includes a first air guide assembly, a second air guide assembly, a third air guide assembly, and a fourth air guide assembly. The first air guide assembly is located between the fan assembly and the battery module along the first direction, and the first air guide assembly is configured to guide the wind blown out of the fan assembly to the surface of the battery module and flow to the first air inlet and the second air inlet, respectively. The second air guide assembly is located between the battery module and the housing along the third direction, and the second air guide assembly is configured to guide the airflow blown out from the first air outlet to above the battery module. The third air guide assembly is located on the side of the battery module away from the second air guide assembly along the third direction, and the third air guide assembly is configured to guide the airflow blown out from the second air outlet to above the battery module. The fourth air guide assembly is located on the side of the fan assembly away from the battery module along the first direction, and the fourth air guide assembly is configured to guide the airflow in the second and third air guide assemblies to the area where the fan assembly is located.

[0014] Optionally, at least two of the first flow guide component, the second flow guide component, the third flow guide component and the fourth flow guide component are integrally formed.

[0015] Optionally, the battery module includes multiple battery assemblies, and the multiple battery assemblies are arranged along the third direction. Each of the battery assemblies includes multiple battery cells, and the multiple battery cells in the same battery assembly are arranged along the second direction; the fan assembly includes multiple fan units, and the multiple fan units are arranged along the third direction.

[0016] Optionally, the battery unit includes a main body and a pole connected to each other, and the pole is located on a side of the battery unit away from the liquid cooling assembly; each battery assembly is correspondingly provided with at least one fan unit

[0017] The beneficial effects of the present invention are as follows: a liquid cooling assembly is arranged at the bottom of the battery module, and the liquid cooling assembly absorbs at least part of the heat generated by the battery module to control the temperature rise of the battery module. In addition, a fan assembly is also arranged on the side of the battery module away from the liquid cooling assembly (i.e., the top of the battery module), so that the fan assembly blows air toward the top of the battery module, forming at least two air flows, which flow away from each other from the top of the battery module to the bottom of the battery module, and enter from the first air inlet and the second air inlet of the fin assembly respectively, and blow out from the first air outlet and the second air outlet to form a heat dissipation airflow surrounding the battery module. In addition, the air flow transports the top heat to the fin assembly area, and exchanges heat with the liquid cooling assembly, which is beneficial to reducing the temperature of the circulating air flow, thereby controlling the temperature rise of the battery module, and reducing the temperature difference between different areas of the battery module, thereby extending the service life of the battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 1 is a schematic diagram of the battery pack structure provided by an embodiment of the present invention;

[0020] Figure 2 yes Figure 1 Exploded view of the structure shown;

[0021] Figure 3 yes Figure 2 Another view of the exploded view shown;

[0022] Figure 4 is a cross-sectional view of a battery pack provided by an embodiment of the present invention taken along a third direction perpendicular to the third direction;

[0023] Figure 5is a cross-sectional view of a battery pack provided by an embodiment of the present invention along a second direction perpendicular to the second direction;

[0024] Figure 6 is a cross-sectional view of a battery pack provided by an embodiment of the present invention taken along a third direction perpendicular to the third direction;

[0025] Figure 7 1 is a schematic structural diagram of a fin assembly provided by an embodiment of the present invention;

[0026] Figure 8 is a schematic structural diagram of multiple flow guide components provided by an embodiment of the present invention;

[0027] Figure 9 yes Figure 8 Another view of the structure shown.

[0028] Description of the accompanying drawings: battery pack 100, shell 10, first wall 11, second wall 12, third wall 13, fourth wall 14, fifth wall 15, sixth wall 16, battery module 20, battery assembly 21, battery cell 211, main body 2111, pole 2112, liquid cooling assembly 30, fin assembly 40, fin 41, first air duct 421, first sub-air inlet 4211, second air duct 422, second sub-air inlet 4221, third air duct 423, third sub-air inlet 4231, fourth air duct 424, fourth sub-air inlet 4241, first blocking area 431, second blocking area 432, third blocking area 433, fourth blocking area 434 , first arc segment 441, second arc segment 442, third arc segment 443, fourth arc segment 444, first air inlet 451, second air inlet 452, first air outlet 461, second air outlet 462, fan assembly 50, fan unit 51, first gap 61, second gap 62, third gap 63, fourth gap 64, fifth gap 65, first airflow 71, second airflow 72, third airflow 73, fourth airflow 74, first guide component 81, first guide plate 811, second guide plate 812, second guide component 82, fourth guide component 84, third guide component 83, first direction X, second direction Y, third direction Z. DETAILED DESCRIPTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0030] The terms "above," "below," "top," and "bottom" used herein are intended only to indicate relative positions. The present invention does not impose any specific limitations on the placement angle of the battery pack 100. For example, when the battery pack 100 is placed upright, the posts 2112 of the battery cells 211 extend upward and are located at the top of the battery cells 211. When the battery pack 100 is inverted, the posts 2112 of the battery cells 211 may also face downward. The present invention will be further described using the upright placement of the battery pack 100 as an example.

[0031] like Figures 1 to 4 As shown, an embodiment of the present invention provides a battery pack 100, including a housing 10 and a battery module 20, wherein the battery module 20 is disposed in the housing 10. The battery module 20 includes a plurality of battery cells 211, and the plurality of battery cells 211 are arranged along a second direction Y.

[0032] Among them, the second direction Y is the thickness direction of the battery cell 211, the third direction Z appearing below is the width direction of the battery cell 211, the first direction X is the height direction of the battery cell 211, and any two of the first direction X, the second direction Y and the third direction Z are perpendicular or approximately perpendicular to each other.

[0033] In one embodiment, the battery cell 211 includes a main body 2111 and a terminal 2112 , at least a portion of which is located at the upper end of the main body 2111 along the first direction X. The battery cell 211 includes two terminals 2112 , which are arranged along the third direction Z. The two terminals 2112 are respectively a positive terminal and a negative terminal.

[0034] like Figures 2 to 5 As shown, in one embodiment, the shell 10 includes a first wall 11, a second wall 12, a third wall 13, a fourth wall 14, a fifth wall 15 and a sixth wall 16. The first wall 11, the battery module 20 and the sixth wall 16 are arranged along a first direction X, the second wall 12, the battery module 20 and the third wall 13 are arranged along a second direction Y, and the fourth wall 14, the battery module 20 and the fifth wall 15 are arranged along a third direction Z.

[0035] In one embodiment, the battery module 20 and the housing 10 form a first gap 61, a second gap 62, a third gap 63, a fourth gap 64, and a fifth gap 65. The first gap 61 is located between the battery module 20 and the first wall 11 along the first direction X, the second gap 62 is located between the battery module 20 and the second wall 12 along the second direction Y, the third gap 63 is located between the battery module 20 and the third wall 13 along the second direction Y, the fourth gap 64 is located between the battery module 20 and the fourth wall 14 along the third direction Z, and the fifth gap 65 is located between the battery module 20 and the fifth wall 15 along the third direction Z.

[0036] Furthermore, the first gap 61 connects to the second gap 62, the third gap 63, the fourth gap 64, and the fifth gap 65, respectively. With this arrangement, heat generated at the top of the battery module 20 (particularly the pole 2112) can be exchanged with the gas within the second gap 62, the third gap 63, the fourth gap 64, and the fifth gap 65 through the first gap 61, and then transferred out through the different sidewalls or other structures, facilitating heat dissipation within the battery module 20. Furthermore, the presence of multiple gaps facilitates the flow of the aforementioned circulating airflow, thereby enhancing the cooling effect.

[0037] In one embodiment, the battery pack 100 further includes a liquid cooling assembly 30 disposed within the housing 10 and located along the first direction X at the bottom of the battery module 20, i.e., on the side of the battery module 20 away from the terminal 2112. By absorbing heat generated by the battery module 20, the liquid cooling assembly 30 can effectively control the temperature rise of the battery module 20 and reduce the adverse effects of temperature rise on the battery pack 100. For those skilled in the art, the liquid cooling assembly 30 is a conventional feature in the art and will not be further described herein.

[0038] In one embodiment, the battery pack 100 further includes a fin assembly 40, which is located within the housing 10 and along the first direction X on the side of the liquid cooling assembly 30 away from the battery modules 20. Providing the fin assembly 40 near the liquid cooling assembly 30 facilitates heat exchange between the liquid cooling assembly 30 and the gas within the housing 10, thereby improving the cooling efficiency of the liquid cooling assembly 30. Furthermore, the fin assembly 40 includes a plurality of fins 41.

[0039] In one embodiment, multiple fins 41 form an air duct, and the air duct has a first air inlet 451, a second air inlet 452, a first air outlet 461 and a second air outlet 462, wherein the first air inlet 451 and the second air inlet 452 are respectively located on both sides of the fin assembly 40 along the second direction Y, and the first air outlet 461 and the second air outlet 462 are respectively located on both sides of the fin assembly 40 along the third direction Z, the first air outlet 461 is respectively connected to the first air inlet 451 and the second air inlet 452, and the second air outlet 462 is respectively connected to the first air inlet 451 and the second air inlet 452.

[0040] The first air inlet 451 is connected to the second gap 62, the second air inlet 452 is connected to the third gap 63, the first air outlet 461 is connected to the fourth gap 64, and the second air outlet 462 is connected to the fifth gap 65. This arrangement connects the gaps within the housing 10 and the air ducts within the fin assembly 40, facilitating airflow and improving heat exchange efficiency, thereby controlling the temperature rise of the battery module 20.

[0041] In an embodiment, the battery pack 100 further comprises a fan assembly 50, which is disposed in the housing 10 and located between the battery module 20 and the first wall 11 along the first direction X. The fan assembly 50 is configured to blow air towards the battery module 20, thereby driving the air to flow between the gaps, thereby controlling the temperature rise of the battery module 20 and reducing the temperature difference between different regions of the battery module 20.

[0042] When the fan assembly 50 blows air towards the battery module 20, at least two air flows can be formed, one of which flows from the top of the battery module 20 towards the second wall 12, and the other of which flows from the top of the battery module 20 towards the third wall 13, and then the two air flows flow along the first direction X towards the sixth wall 16 between the battery module 20 and the housing 10, respectively enter the air ducts in the fin assembly 40 from the first air inlet 451 and the second air inlet 452, and are blown out from the first air outlet 461 and the second air outlet 462, respectively, and then flow along the first direction X towards the first wall 11, and finally form a circulating air flow.

[0043] The circulating air flow can transport the heat at the top of the battery module 20 to the region of the liquid cooling assembly 30 at the bottom, exchange heat with the liquid cooling assembly 30, and help control the temperature rise of the battery module 20.

[0044] In addition, the two air flows flow in opposite directions at the top of the battery module 20, respectively carrying away the heat at different regions of the top of the battery module 20 along the second direction Y, which helps to reduce the temperature difference between different regions of the top of the battery module 20. In addition, the at least two air flows enter the fin assembly 40 along the second direction Y and are blown out from the two sides of the fin assembly 40 along the third direction Z, which helps to fully contact the air flow with the fin assembly 40 and reduce the temperature difference between different air flows, thereby reducing the temperature difference between different regions of the battery module 20.

[0045] As shown in FIG. 1, Figures 2 to 7 In an embodiment, the fin assembly 40 comprises a first air duct 421, a second air duct 422, a third air duct 423, and a fourth air duct 424, the first air duct 421 and the second air duct 422 are arranged along the second direction Y, the third air duct 423 and the fourth air duct 424 are arranged along the second direction Y, the first air duct 421 and the third air duct 423 are arranged along the third direction Z, and the second air duct 422 and the fourth air duct 424 are arranged along the third direction Z.

[0046] In an embodiment, part of the first air inlet 451 forms an air inlet of the first air duct 421 (a first sub-air inlet 4211), part of the second air inlet 452 forms an air inlet of the second air duct 422 (a second sub-air inlet 4221), part of the first air outlet 461 forms an air outlet of the first air duct 421, and part of the first air outlet 461 forms an air outlet of the second air duct 422.

[0047] When the fan assembly 50 blows air toward the battery module 20, part of the air flow enters the first air duct 421 from the first sub-air inlet 4211, and part of the air flow enters the second air duct 422 through the second sub-air inlet 4221. After the two air flows pass through the fin assembly 40, they are both blown out from the first air outlet 461.

[0048] In one embodiment, a portion of the first air inlet 451 forms an air inlet of the third air duct 423 (third sub-air inlet 4231), a portion of the second air inlet 452 forms an air inlet of the fourth air duct 424 (fourth sub-air inlet 4241), a portion of the second air outlet 462 forms an air outlet of the third air duct 423, and a portion of the second air outlet 462 forms an air outlet of the fourth air duct 424.

[0049] When the fan assembly 50 blows air toward the battery module 20, part of the air flow enters the third air duct 423 through the third sub-air inlet 4231, and part of the air flow enters the fourth air duct 424 through the fourth sub-air inlet 4241. After the two air flows through the fin assembly 40, they are both blown out from the second air outlet 462.

[0050] In one embodiment, the airflow generated by the operation of the fan assembly 50 includes a first airflow 71 , a second airflow 72 , a third airflow 73 and a fourth airflow 74 .

[0051] The first airflow 71 is configured to flow sequentially through the first gap 61, the second gap 62, the first sub-inlet 4211, the first air duct 421, the first air outlet 461, and the fourth gap 64, ultimately returning to the first gap 61. The first airflow 71 first flows through the top region of the battery module 20, i.e., the electrode 2112 region where heat generation is greatest, exchanging heat with the top region of the battery module 20. This lowers the temperature of the top region of the battery module 20 and increases the temperature of the first airflow 71. The higher-temperature airflow then enters the first air duct 421 through the second gap 62, then exchanges heat with the liquid cooling assembly 30, lowering the temperature of the first airflow 71. The lower-temperature airflow then flows back through the fourth gap 64 to the first gap 61. This repetitive cycle improves the heat exchange efficiency between the top region of the battery module 20 and the liquid cooling assembly 30, controls the temperature rise of the battery module 20, and reduces the temperature difference between different regions of the battery module 20.

[0052] The second airflow 72 is configured to flow sequentially through the first gap 61, the third gap 63, the second sub-inlet 4221, the second air duct 422, the first air outlet 461, and the fourth gap 64, ultimately returning to the first gap 61. The second airflow 72 first flows through the top region of the battery module 20, i.e., the region of the pole 2112 generating the greatest heat, exchanging heat with the top region of the battery module 20. This lowers the temperature of the top region of the battery module 20 and increases the temperature of the second airflow 72. The higher-temperature airflow then enters the second air duct 422 via the third gap 63, then exchanges heat with the liquid cooling assembly 30, lowering the temperature of the second airflow 72. The lower-temperature airflow then flows back to the first gap 61 via the fourth gap 64. This repetitive cycle improves the heat exchange efficiency between the top region of the battery module 20 and the liquid cooling assembly 30, controls the temperature rise of the battery module 20, and reduces the temperature difference between different regions of the battery module 20.

[0053] The third airflow 73 is configured to flow sequentially through the first gap 61, the second gap 62, the third sub-inlet 4231, the third air duct 423, the second air outlet 462, and the fifth gap 65, ultimately returning to the first gap 61. The third airflow 73 first flows through the top region of the battery module 20, i.e., the electrode 2112 region where heat generation is greatest, exchanging heat with the top region of the battery module 20. This lowers the temperature of the top region of the battery module 20 and increases the temperature of the third airflow 73. The higher-temperature airflow then enters the third air duct 423 through the second gap 62, then exchanges heat with the liquid cooling assembly 30, lowering the temperature of the third airflow 73. The lower-temperature airflow then flows back through the fifth gap 65 to the first gap 61. This repetitive cycle improves the heat exchange efficiency between the top region of the battery module 20 and the liquid cooling assembly 30, controls the temperature rise of the battery module 20, and reduces the temperature difference between different regions of the battery module 20.

[0054] The fourth airflow 74 is configured to flow sequentially through the first gap 61, the third gap 63, the fourth sub-inlet 4241, the fourth air duct 424, the second air outlet 462, and the fifth gap 65, ultimately returning to the first gap 61. The fourth airflow 74 first flows through the top region of the battery module 20, i.e., the region of the pole 2112 generating the greatest heat, exchanging heat with the top region of the battery module 20. This lowers the temperature of the top region of the battery module 20 and increases the temperature of the fourth airflow 74. The higher-temperature airflow then enters the fourth air duct 424 through the third gap 63, then exchanges heat with the liquid cooling assembly 30, lowering the temperature of the fourth airflow 74. The lower-temperature airflow then flows back through the fifth gap 65 to the first gap 61. This repetitive cycle improves the heat exchange efficiency between the top region of the battery module 20 and the liquid cooling assembly 30, controls the temperature rise of the battery module 20, and reduces the temperature difference between different regions of the battery module 20.

[0055] In one embodiment, within the first gap 61 at the top of the battery module 20, along the second direction Y, the first airflow 71 flows from the middle area of ​​the battery module 20 toward the second wall 12, the second airflow 72 flows from the middle area of ​​the battery module 20 toward the third wall 13, the third airflow 73 flows from the middle area of ​​the battery module 20 toward the second wall 12, and the fourth airflow 74 flows from the middle area of ​​the battery module 20 toward the third wall 13. The first airflow 71, the second airflow 72, the third airflow 73 and the fourth airflow 74 cooperate to take away the heat from the top of the battery module 20, which is beneficial to reducing the temperature difference between different areas of the top of the battery module 20.

[0056] In one embodiment, through the cooperation of the first airflow 71, the second airflow 72, the third airflow 73, the fourth airflow 74, the first air duct 421, the second air duct 422, the third air duct 423 and the fourth air duct 424, a circulating airflow surrounding the battery module 20 can be formed, and the high heat in different areas of the top of the battery module 20 is transferred to the liquid cooling component 30 area, and heat exchange occurs with the liquid cooling component 30, thereby effectively controlling the temperature rise of the battery module 20 and reducing the temperature difference between different areas of the battery module 20.

[0057] In one embodiment, along the second direction Y, the fan assembly 50 is located above the middle area of ​​the battery module 20 , which helps to reduce the temperature difference between different areas at the top of the battery module 20 .

[0058] In one embodiment, the first airflow 71 and the third airflow 73 may merge in the second gap 62 .

[0059] In one embodiment, the second airflow 72 and the fourth airflow 74 may merge in the third gap 63 .

[0060] In one embodiment, when viewed along the first direction X, the first air duct 421 includes a first arcuate segment 441 that connects the second gap 62 and the fourth gap 64. Providing the first arcuate segment 441 within the first air duct 421 facilitates extending the length of the first air duct 421, increasing the heat exchange area between the first airflow 71 flowing through the first air duct 421 and the fin assembly 40, thereby improving the heat exchange efficiency between the first airflow 71 and the liquid cooling assembly 30, and facilitating control of the temperature rise of the battery module 20.

[0061] In one embodiment, the fin assembly 40 includes a plurality of first air ducts 421 , which are spaced apart on a projection plane perpendicular to the first direction X. Furthermore, a plurality of first arcuate segments 441 are spaced apart on a projection plane perpendicular to the first direction X. The provision of the plurality of first air ducts 421 facilitates increasing the contact area between the fins 41 and the first airflow 71 within the first air ducts 421 , thereby improving the heat exchange efficiency between the fin assembly 40 and the first airflow 71 .

[0062] In one embodiment, the fin assembly 40 further includes a first blocking area 431, which is located on the center side of the first arcuate segment 441. That is, the first blocking area 431 is located on the side of the first arcuate segment 441 that faces the center. Furthermore, the first blocking area 431 is located close to the first arcuate segment 441, which has a smaller radius. This arrangement helps prevent the first airflow 71 from passing through a short air duct, which could lead to insufficient heat exchange. This improves the heat exchange efficiency between the first airflow 71 and the fin assembly 40 without increasing the gas flux. It will be understood that the first blocking area 431 is an area without an air duct.

[0063] In one embodiment, when viewed along the first direction X, the second air duct 422 includes a second curved segment 442 , which connects the third gap 63 and the fourth gap 64 . Providing the second curved segment 442 within the second air duct 422 facilitates extending the length of the second air duct 422 , increasing the heat exchange area between the second airflow 72 flowing through the second air duct 422 and the fin assembly 40 , thereby improving the heat exchange efficiency between the second airflow 72 and the liquid cooling assembly 30 , and facilitating control of the temperature rise of the battery module 20 .

[0064] In one embodiment, the fin assembly 40 includes a plurality of second air ducts 422 , which are spaced apart on a projection plane perpendicular to the first direction X. Furthermore, a plurality of second arcuate segments 442 are spaced apart on a projection plane perpendicular to the first direction X. The provision of the plurality of second air ducts 422 facilitates increasing the contact area between the fins 41 and the second air flow 72 within the second air ducts 422 , thereby improving the heat exchange efficiency between the fin assembly 40 and the second air flow 72 .

[0065] In one embodiment, the fin assembly 40 further includes a second blocking area 432, which is located on the center side of the second arcuate segment 442. That is, the second blocking area 432 is located on the side of the second arcuate segment 442 that faces the center. Furthermore, the second blocking area 432 is located close to the second arcuate segment 442, which has a smaller radius. This arrangement helps prevent the second airflow 72 from passing through a short air duct, which could lead to insufficient heat exchange. This improves the heat exchange efficiency between the second airflow 72 and the fin assembly 40 without increasing the gas flux. It will be appreciated that the second blocking area 432 is an area without an air duct.

[0066] In one embodiment, when viewed along the first direction X, the third air duct 423 includes a third curved segment 443 that connects the second gap 62 and the fifth gap 65. Providing the third curved segment 443 within the third air duct 423 facilitates extending the length of the third air duct 423, increasing the heat exchange area between the third airflow 73 flowing through the third air duct 423 and the fin assembly 40, thereby improving the heat exchange efficiency between the third airflow 73 and the liquid cooling assembly 30, thereby facilitating control of the temperature rise of the battery module 20.

[0067] In one embodiment, the fin assembly 40 includes a plurality of third air ducts 423 , which are spaced apart on a projection plane perpendicular to the first direction X. Furthermore, a plurality of third arcuate segments 443 are spaced apart on a projection plane perpendicular to the first direction X. The provision of the plurality of third air ducts 423 increases the contact area between the fins 41 and the third air flow 73 within the third air ducts 423 , thereby improving the heat exchange efficiency between the fin assembly 40 and the third air flow 73 .

[0068] In one embodiment, the fin assembly 40 further includes a third blocking area 433, which is located on the central side of the third arcuate segment 443. That is, the third blocking area 433 is located on the side of the third arcuate segment 443 that faces the center. Furthermore, the third blocking area 433 is located close to the third arcuate segment 443, which has a smaller radius. This arrangement helps prevent the third airflow 73 from passing through a shorter air duct, which could lead to insufficient heat exchange. This improves the heat exchange efficiency between the third airflow 73 and the fin assembly 40 without increasing the gas flux. It will be appreciated that the third blocking area 433 is an area without an air duct.

[0069] In one embodiment, when viewed along the first direction X, the fourth air duct 424 includes a fourth arcuate segment 444 , which connects the third gap 63 and the fifth gap 65 . Providing the fourth arcuate segment 444 within the fourth air duct 424 facilitates extending the length of the fourth air duct 424 , increasing the heat exchange area between the fourth airflow 74 flowing through the fourth air duct 424 and the fin assembly 40 , thereby improving the heat exchange efficiency between the fourth airflow 74 and the liquid cooling assembly 30 , thereby facilitating control of the temperature rise of the battery module 20 .

[0070] In one embodiment, the fin assembly 40 includes a plurality of fourth air ducts 424 , which are spaced apart on a projection plane perpendicular to the first direction X. Furthermore, a plurality of fourth arc segments 444 are spaced apart on a projection plane perpendicular to the first direction X. The provision of the plurality of fourth air ducts 424 facilitates increasing the contact area between the fins 41 and the fourth air flow 74 within the fourth air ducts 424 , thereby improving the heat exchange efficiency between the fin assembly 40 and the fourth air flow 74 .

[0071] In one embodiment, the fin assembly 40 further includes a fourth blocking region 434, which is located on the central side of the fourth arcuate segment 444. That is, the fourth blocking region 434 is located on the side of the fourth arcuate segment 444 that faces the center. Furthermore, the fourth blocking region 434 is located close to the fourth arcuate segment 444, which has a smaller radius. This arrangement helps prevent insufficient heat exchange caused by the fourth airflow 74 passing through a shorter air duct, thereby improving the heat exchange efficiency between the fourth airflow 74 and the fin assembly 40 without increasing the air flow rate. It will be appreciated that the fourth blocking region 434 is an area without an air duct.

[0072] like Figures 2 to 5 、 Figure 8 and Figure 9 As shown, in one embodiment, the battery pack 100 further includes a first air guide assembly 81. At least a portion of the first air guide assembly 81 is disposed in the first gap 61 and is located between the fan assembly 50 and the battery module 20. The first air guide assembly 81 is configured to guide the air blown out by the fan assembly 50 to the second gap 62 and / or the third gap 63. The provision of the first air guide assembly 81 facilitates the guidance of gas flow, thereby forming a first airflow 71 flowing to the second gap 62 and a second airflow 72 flowing to the third gap 63.

[0073] In one embodiment, the first guide assembly 81 includes a first guide plate 811 and a second guide plate 812. The first guide plate 811 and the second guide plate 812 are arranged along the second direction Y and are both inclined downward toward the battery module 20 to divide the airflow blown by the fan assembly 50 into airflows in different directions to form a first airflow 71 / second airflow 72 / third airflow 73 / fourth airflow 74.

[0074] In one embodiment, the battery pack 100 further includes a second air guide assembly 82. At least a portion of the second air guide assembly 82 is disposed within the fourth gap 64 and between the battery module 20 and the fourth wall 14. The second air guide assembly 82 is configured to guide the rising airflow from the bottom to the first gap 61. Providing the second air guide assembly 82 within the fourth gap 64 reduces the risk of eddy currents within the second gap 62 and improves the cooling efficiency of the battery module 20 by the airflow.

[0075] In one embodiment, the cross-sectional area of ​​the second air guide component 82 gradually decreases in the upward direction along the first direction X, which is beneficial for gathering the gas blown out from the first air outlet 461 and guiding it to the top of the battery module 20 .

[0076] In one embodiment, the battery pack 100 further includes a third air guide assembly 83. At least a portion of the third air guide assembly 83 is disposed within the fifth gap 65 and between the battery module 20 and the fifth wall 15. The third air guide assembly 83 is configured to guide the rising airflow from the bottom to the first gap 61. The placement of the third air guide assembly 83 within the fifth gap 65 helps reduce the risk of eddy currents within the fifth gap 65 and improves the cooling efficiency of the battery module 20 by the airflow.

[0077] In one embodiment, the cross-sectional area of ​​the third air guide component 83 gradually decreases in the upward direction along the first direction X, which is beneficial for gathering the gas blown out from the second air outlet 462 and guiding it to the top of the battery module 20 .

[0078] In one embodiment, the battery pack 100 also includes a fourth guide component 84, at least a portion of which is disposed in the first gap 61 and is disposed between the fan assembly 50 and the housing 10 along the first direction X. The fourth guide component 84 is configured to guide the rising airflow in the second guide component 82 and the third guide component 83 to above the fan assembly 50, thereby facilitating the fan assembly 50 to blow the refluxed gas toward the battery module 20 again, which is conducive to forming a circulating airflow in the battery pack 100.

[0079] In one embodiment, the fan assembly 50 is connected to the fourth air guide assembly 84 .

[0080] In one embodiment, at least two of the first flow guiding component 81 , the second flow guiding component 82 , the fourth flow guiding component 84 and the third flow guiding component 83 are made of the same material and are integrally formed.

[0081] In one embodiment, the fan assembly 50 includes a plurality of fan units 51 arranged along the third direction Z. This arrangement is conducive to increasing the gas flow within the battery pack 100 and is particularly suitable for modules with a large number of battery cells 211, and has a good cooling effect on modules with a large number of battery cells 211.

[0082] In one embodiment, a battery module 20 includes multiple battery assemblies 21 arranged along a third direction Z. Each battery assembly 21 includes multiple battery cells 211, and the multiple battery cells 211 within a battery assembly 21 are arranged along a second direction Y. The battery module 20 including multiple battery assemblies 21 can be cooled using the gas-liquid coupling method described in any of the aforementioned embodiments, which significantly reduces the temperature rise of the battery module 20 and reduces the temperature difference between different areas of the battery module 20.

[0083] In one embodiment, at least one fan unit 51 is disposed above each battery assembly 21 along the first direction X, which significantly improves the temperature rise of the battery module 20 and reduces the temperature difference between different areas of the battery module 20. Optionally, the number of battery assemblies 21 and the number of fan units 51 are equal, with one fan unit 51 correspondingly disposed above each battery assembly 21.

[0084] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship and movement status of the various components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0085] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element through an intervening element.

[0086] In addition, the descriptions of "first", "second", etc. in the present invention are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0087] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present description and drawings under the inventive concept of the present invention, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: case; A battery module is disposed in the housing; a liquid cooling assembly disposed in the housing, the liquid cooling assembly being located below the battery module along a first direction; A fin assembly is provided in the housing, the fin assembly is located on a side of the liquid cooling assembly away from the battery module along the first direction, the fin assembly has a first air inlet, a second air inlet, a first air outlet, and a second air outlet, the first air inlet and the second air inlet are respectively located on both sides of the fin assembly along the second direction, the first air outlet and the second air outlet are respectively located on both sides of the fin assembly along the third direction, the first air outlet is respectively connected to the first air inlet and the second air inlet, the second air outlet is respectively connected to the first air inlet and the second air inlet, and any two of the first direction, the second direction, and the third direction are perpendicular to each other; A fan assembly is disposed in the shell and is located on a side of the battery module away from the liquid cooling assembly along the first direction. The fan assembly is configured to blow air toward the battery module so that part of the airflow in the shell enters the first air inlet and part of the airflow enters the second air inlet, and is blown out from the first air outlet and the second air outlet respectively.

2. The battery pack according to claim 1, wherein: Along the second direction, the fan assembly is located in the middle of the battery module.

3. The battery pack according to claim 1, wherein: The first air inlet includes a first sub-air inlet and a second sub-air inlet, and the second air inlet includes a third sub-air inlet and a fourth sub-air inlet; The fin assembly also has: a first air duct, the first air duct connecting the first sub-air inlet and the first air outlet; a second air duct, the second air duct connecting the second sub-air inlet and the second air outlet; a third air duct, the third air duct connecting the third sub-air inlet and the second air outlet; A fourth air duct is connected to the fourth sub-air inlet and the first air outlet.

4. The battery pack according to claim 3, wherein: At least one of the first air duct, the second air duct, the third air duct, and the fourth air duct includes an arc segment.

5. The battery pack according to claim 4, characterized in that: The first air duct includes a first arc segment, and the fin assembly further includes a first blocking area, and the first blocking area is located on the center side of the first arc segment; and / or, The second air duct includes a second arc segment, and the fin assembly further includes a second blocking area, and the second blocking area is located on the center side of the second arc segment; and / or, The third air duct includes a third arc segment, and the fin assembly further includes a third blocking area, and the third blocking area is located on the center side of the third arc segment; and / or, The fourth air duct includes a fourth arc-shaped segment, and the fin assembly further has a fourth blocking area, which is located on the center side of the fourth arc-shaped segment.

6. The battery pack according to claim 3, characterized in that: Along the third direction, the first sub-air inlet and the second sub-air inlet are respectively located on both sides of the center line of the battery module, and the third sub-air inlet and the fourth sub-air inlet are respectively located on both sides of the center line of the battery module.

7. The battery pack according to claim 1, wherein: The battery pack further includes: a first air guide assembly, located between the fan assembly and the battery module along the first direction, and configured to guide air blown out by the fan assembly to a surface of the battery module and to flow toward the first air inlet and the second air inlet, respectively; a second air guide assembly, the second air guide assembly being located between the battery module and the housing along the third direction, the second air guide assembly being configured to guide the airflow blown out from the first air outlet to above the battery module; a third air guide assembly, the third air guide assembly being located along the third direction on a side of the battery module facing away from the second air guide assembly, the third air guide assembly being configured to guide the airflow blown out from the second air outlet to above the battery module; A fourth air guide component is located along the first direction on the side of the fan component away from the battery module, and the fourth air guide component is configured to guide the airflow in the second air guide component and the third air guide component to the area where the fan component is located.

8. The battery pack according to claim 7, characterized in that: At least two of the first flow guide component, the second flow guide component, the third flow guide component and the fourth flow guide component are integrally formed.

9. The battery pack according to any one of claims 1 to 8, characterized in that: The battery module includes a plurality of battery assemblies, the plurality of battery assemblies are arranged along the third direction, each of the battery assemblies includes a plurality of battery cells, and the plurality of battery cells in the same battery assembly are arranged along the second direction; The fan assembly includes a plurality of fan units, and the plurality of fan units are arranged along the third direction.

10. The battery pack according to claim 9, characterized in that: The battery unit includes a main body and a pole connected to each other, wherein the pole is located on a side of the battery unit away from the liquid cooling assembly; Each of the battery components is correspondingly provided with at least one fan unit.

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