Battery pack

Abstract

The battery pack comprises 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 in the first direction, and the fin assembly is located on the side, away from the liquid cooling assembly, of the liquid cooling assembly in the first direction; the fan assembly is located above the battery module in the first direction. The fin assembly is provided with 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 located in the two sides, in the second direction, of the fin assembly correspondingly, and the first air outlet and the second air outlet are located in the two sides, in the third direction, of the fin assembly correspondingly. The fan assembly is configured to blow air towards the battery module, so that part of airflow in the shell enters the first air inlet, part of airflow enters the second air inlet, and the airflow 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 getting higher and higher, but the problem of uniform temperature and heat dissipation within the battery pack has always been a challenge that the industry has difficulty in overcoming. 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, a solution provided by the present invention is: 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 airflow in the shell enters the first air inlet, part of the airflow 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 also has a first air duct, a second air duct, a third air duct and a fourth air duct, 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 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 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 guide component, a second guide component, a third guide component and a fourth guide component. The first guide component is located between the fan component and the battery module along the first direction, and the first guide component is configured to guide the wind blown out of the fan component to the surface of the battery module and flow to the first air inlet and the second air inlet respectively. The second guide component is located between the battery module and the shell along the third direction, and the second guide component is configured to guide the airflow blown out from the first air outlet to the top of the battery module. The third guide component is located on the side of the battery module away from the second guide component along the third direction, and the third guide component is configured to guide the airflow blown out from the second air outlet to the top of the battery module. The fourth guide component is located on the side of the fan component away from the battery module along the first direction, and the fourth guide component is configured to guide the airflow in the second guide component and the third guide component to the area where the fan component 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 comprises 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 effect of the present invention is that the 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 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 to form at least two air flows, which flow from the top of the battery module to the bottom of the battery module in opposite directions, 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 airflow transports the top heat to the fin assembly area, and heat exchanges with the liquid cooling assembly, which is conducive to reducing the temperature of the circulating airflow, 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 drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

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

[0020] Figure 2 yes Figure 1 An 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 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 along a third direction perpendicular to the third direction;

[0025] Figure 7 is a structural schematic 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] Fig. 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 be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] The words "above", "below", "top", "bottom" and the like appearing in this document are only used to indicate relative positional relationships. The present invention does not specifically limit the placement angle of the battery pack 100. For example, when the battery pack 100 is placed upright, the pole 2112 of the battery cell 211 extends upward and is located at the top of the battery cell 211. When the battery pack 100 is inverted, the pole 2112 of the battery cell 211 may also be arranged downward. The present invention is further described by taking the battery pack 100 placed upright 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 unit 211 includes a main body 2111 and a pole 2112, and at least a portion of the pole 2112 is located at the upper end of the main body 2111 along the first direction X. The battery unit 211 includes two poles 2112, and the two poles 2112 are arranged along the third direction Z, and the two poles 2112 are respectively a positive pole and a negative pole.

[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 is connected to the second gap 62, the third gap 63, the fourth gap 64 and the fifth gap 65 respectively. With such a configuration, the heat generated at the top of the battery module 20 (especially the pole 2112) can be heat exchanged with the gas in the second gap 62 / the third gap 63 / the fourth gap 64 / the fifth gap 65 through the first gap 61, and then transferred out through different side walls or other structures, which is beneficial to the heat dissipation of the battery module 20. In addition, the presence of multiple gaps is also beneficial to the flow of the aforementioned circulating airflow to improve the cooling effect.

[0037] In one embodiment, the battery pack 100 further includes a liquid cooling assembly 30, which is disposed in the housing 10 and is located at the bottom of the battery module 20 along the first direction X, that is, on the side of the battery module 20 away from the pole 2112. By arranging the liquid cooling assembly 30 to absorb the heat generated by the battery module 20, the temperature rise of the battery module 20 can be effectively controlled, and the adverse effects of the temperature rise on the battery pack 100 can be reduced. For those skilled in the art, the liquid cooling assembly 30 is a conventional arrangement in the technical field, and the present invention will not be repeated.

[0038] In one embodiment, the battery pack 100 further includes a fin assembly 40, which is located in the housing 10 and is located on a side of the liquid cooling assembly 30 away from the battery module 20 along the first direction X. By arranging the fin assembly 40 in a region close to the liquid cooling assembly 30, it is beneficial for the liquid cooling assembly 30 to exchange heat with the gas in the housing 10, thereby improving the cooling efficiency of the liquid cooling assembly 30. Further, the fin assembly 40 includes a plurality of fins 41.

[0039] In one embodiment, a plurality of 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, and 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. In this way, the gaps in the housing 10 and the air ducts in the fin assembly 40 are connected, which is conducive to air flow, so as to improve the heat exchange efficiency and control the temperature rise of the battery module 20.

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

[0042] When the fan assembly 50 blows air toward the battery module 20, at least two airflows can be formed, one of which flows from the top of the battery module 20 toward the second wall 12, and the other flows from the top of the battery module 20 toward the third wall 13. Then, the two airflows flow in the space between the battery module 20 and the shell 10 along the first direction X toward the sixth wall 16, respectively, enter the air duct 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, and then flow along the first direction X toward the first wall 11, finally forming a circulating airflow.

[0043] The circulating airflow can transfer the heat at the top of the battery module 20 to the liquid cooling assembly 30 area at the bottom, and exchange heat with the liquid cooling assembly 30 , which is beneficial to controlling the temperature rise of the battery module 20 .

[0044] Furthermore, the two airflows flow in directions away from each other at the top of the battery module 20, and take away the heat from different regions of the top of the battery module 20 along the second direction Y, which is beneficial to reducing the temperature difference between different regions of the top of the battery module 20. Furthermore, at least two airflows enter the fin assembly 40 along the second direction Y, and are blown out from both sides of the fin assembly 40 along the third direction Z, which is beneficial to the full contact between the airflow and the fin assembly 40, and to reduce the temperature difference between different airflows, thereby reducing the temperature difference between different regions of the battery module 20.

[0045] like Figures 2 to 7 As shown, in one embodiment, the fin assembly 40 includes 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 one embodiment, a portion of the first air inlet 451 forms an air inlet of the first air duct 421 (first sub-air inlet 4211), a portion of the second air inlet 452 forms an air inlet of the second air duct 422 (second sub-air inlet 4221), a portion of the first air outlet 461 forms an air outlet of the first air duct 421, and a portion 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 airflow enters the first air duct 421 from the first sub-air inlet 4211 , and part of the airflow enters the second air duct 422 through the second sub-air inlet 4221 . After the two airflows 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 airflow enters the third air duct 423 through the third sub-air inlet 4231 , and part of the airflow enters the fourth air duct 424 through the fourth sub-air inlet 4241 . After the two airflows pass 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 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 in sequence, and finally flow back to the first gap 61. The first airflow 71 first flows through the top area of ​​the battery module 20, that is, the pole 2112 area with the largest heat generation, and exchanges heat with the top area of ​​the battery module 20. The temperature of the top of the battery module 20 decreases, and the temperature of the first airflow 71 increases. The airflow with a higher temperature enters the first air duct 421 through the second gap 62, and then exchanges heat with the liquid cooling component 30. The temperature of the first airflow 71 decreases, and then the airflow with a lower temperature flows back to the first gap 61 through the fourth gap 64. The cycle is repeated, which is beneficial to improving the heat exchange efficiency between the top area of ​​the battery module 20 and the liquid cooling component 30, controlling the temperature rise of the battery module 20, and reducing the temperature difference between different areas of the battery module 20.

[0052] The second airflow 72 is configured to flow 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 in sequence, and finally flow back to the first gap 61. The second airflow 72 first flows through the top region of the battery module 20, that is, the pole 2112 region with the largest heat generation, and exchanges heat with the top region of the battery module 20. The temperature of the top of the battery module 20 decreases, and the temperature of the second airflow 72 increases. The airflow with a higher temperature enters the second air duct 422 through the third gap 63, and then exchanges heat with the liquid cooling assembly 30. The temperature of the second airflow 72 decreases. Then, the airflow with a lower temperature flows back to the first gap 61 through the fourth gap 64. The cycle is repeated, which is beneficial to improving the heat exchange efficiency between the top region of the battery module 20 and the liquid cooling assembly 30, controlling the temperature rise of the battery module 20, and reducing the temperature difference between different regions of the battery module 20.

[0053] The third airflow 73 is configured to flow 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 in sequence, and finally flow back to the first gap 61. The third airflow 73 first flows through the top region of the battery module 20, that is, the pole 2112 region with the largest heat generation, and exchanges heat with the top region of the battery module 20, the temperature of the top of the battery module 20 decreases, the temperature of the third airflow 73 increases, the airflow with a higher temperature enters the third air duct 423 through the second gap 62, and then exchanges heat with the liquid cooling assembly 30, the temperature of the third airflow 73 decreases, and then the airflow with a lower temperature flows back to the first gap 61 through the fifth gap 65, and the cycle is repeated, which is conducive to improving the heat exchange efficiency between the top region of the battery module 20 and the liquid cooling assembly 30, controlling the temperature rise of the battery module 20, and reducing the temperature difference between different regions of the battery module 20.

[0054] The fourth airflow 74 is configured to flow 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 in sequence, and finally flow back to the first gap 61. The fourth airflow 74 first flows through the top area of ​​the battery module 20, that is, the pole 2112 area with the largest heat generation, and exchanges heat with the top area of ​​the battery module 20. The temperature of the top of the battery module 20 decreases, and the temperature of the fourth airflow 74 increases. The airflow with a higher temperature enters the fourth air duct 424 through the third gap 63, and then exchanges heat with the liquid cooling assembly 30. The temperature of the fourth airflow 74 decreases, and then the airflow with a lower temperature flows back to the first gap 61 through the fifth gap 65. The cycle is repeated, which is beneficial to improving the heat exchange efficiency between the top area of ​​the battery module 20 and the liquid cooling assembly 30, controlling the temperature rise of the battery module 20, and reducing the temperature difference between different areas 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 helps to reduce the temperature difference between different areas at 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 can be 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 is beneficial to reducing 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 converge 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 arc segment 441, and the first arc segment 441 communicates with the second gap 62 and the fourth gap 64. By providing the first arc segment 441 in the first air duct 421, it is beneficial to extend the length of the first air duct 421, increase the heat exchange area between the first airflow 71 flowing through the first air duct 421 and the fin assembly 40, and further improve the heat exchange efficiency between the first airflow 71 and the liquid cooling assembly 30, which is beneficial to control the temperature rise of the battery module 20.

[0061] In one embodiment, the fin assembly 40 includes a plurality of first air ducts 421, and the plurality of first air ducts 421 are arranged at intervals on a projection plane perpendicular to the first direction X. Further, a plurality of first arc segments 441 are arranged at intervals on a projection plane perpendicular to the first direction X. By providing a plurality of first air ducts 421, it is beneficial to increase the contact area between the fin 41 and the first air flow 71 in the first air duct 421, thereby improving the heat exchange efficiency between the fin assembly 40 and the first air flow 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 arc segment 441, that is, the first blocking area 431 is located on the side of the first arc segment 441 facing the center. Further, the first blocking area 431 is close to the first arc segment 441 with a smaller radius. Such a configuration is conducive to avoiding insufficient heat exchange caused by the first airflow 71 passing through the air duct with a shorter stroke, and improving the heat exchange efficiency of the first airflow 71 and the fin assembly 40 without increasing the gas flux. It can 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 arc segment 442, and the second arc segment 442 communicates with the third gap 63 and the fourth gap 64. By providing the second arc segment 442 in the second air duct 422, it is beneficial to extend the length of the second air duct 422, increase the heat exchange area between the second air flow 72 flowing through the second air duct 422 and the fin assembly 40, and further improve the heat exchange efficiency between the second air flow 72 and the liquid cooling assembly 30, which is beneficial to control the temperature rise of the battery module 20.

[0064] In one embodiment, the fin assembly 40 includes a plurality of second air ducts 422, and the plurality of second air ducts 422 are arranged at intervals on a projection plane perpendicular to the first direction X. Further, the plurality of second arc segments 442 are arranged at intervals on a projection plane perpendicular to the first direction X. By providing a plurality of second air ducts 422, it is beneficial to increase the contact area between the fin 41 and the second air flow 72 in the second air duct 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 arc segment 442, that is, the second blocking area 432 is located on the side of the second arc segment 442 facing the center. Further, the second blocking area 432 is close to the second arc segment 442 with a smaller radius. Such a configuration is conducive to avoiding insufficient heat exchange caused by the second airflow 72 passing through the air duct with a shorter stroke, and improving the heat exchange efficiency of the second airflow 72 and the fin assembly 40 without increasing the gas flux. It can be understood 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 arc segment 443, and the third arc segment 443 communicates with the second gap 62 and the fifth gap 65. By providing the third arc segment 443 in the third air duct 423, it is beneficial to extend the length of the third air duct 423, increase the heat exchange area between the third airflow 73 flowing through the third air duct 423 and the fin assembly 40, and further improve the heat exchange efficiency between the third airflow 73 and the liquid cooling assembly 30, which is beneficial to control the temperature rise of the battery module 20.

[0067] In one embodiment, the fin assembly 40 includes a plurality of third air ducts 423, and the plurality of third air ducts 423 are arranged at intervals on a projection plane perpendicular to the first direction X. Further, a plurality of third arc segments 443 are arranged at intervals on a projection plane perpendicular to the first direction X. By providing a plurality of third air ducts 423, it is beneficial to increase the contact area between the fin 41 and the third air flow 73 in the third air duct 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 center side of the third arc segment 443, that is, the third blocking area 433 is located on the side of the third arc segment 443 facing the center. Further, the third blocking area 433 is close to the third arc segment 443 with a smaller radius. Such a configuration is conducive to avoiding insufficient heat exchange caused by the third airflow 73 passing through the air duct with a shorter stroke, and improving the heat exchange efficiency of the third airflow 73 and the fin assembly 40 without increasing the gas flux. It can be understood 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 arc segment 444, and the fourth arc segment 444 communicates with the third gap 63 and the fifth gap 65. By providing the fourth arc segment 444 in the fourth air duct 424, it is beneficial to extend the length of the fourth air duct 424, increase the heat exchange area between the fourth airflow 74 flowing through the fourth air duct 424 and the fin assembly 40, and further improve the heat exchange efficiency between the fourth airflow 74 and the liquid cooling assembly 30, which is beneficial to control the temperature rise of the battery module 20.

[0070] In one embodiment, the fin assembly 40 includes a plurality of fourth air ducts 424, and the plurality of fourth air ducts 424 are arranged at intervals on a projection plane perpendicular to the first direction X. Further, a plurality of fourth arc segments 444 are arranged at intervals on a projection plane perpendicular to the first direction X. By providing a plurality of fourth air ducts 424, it is beneficial to increase the contact area between the fin 41 and the fourth air flow 74 in the fourth air duct 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 area 434, which is located on the center side of the fourth arc segment 444, that is, the fourth blocking area 434 is located on the side of the fourth arc segment 444 facing the center. Further, the fourth blocking area 434 is close to the fourth arc segment 444 with a smaller radius. Such a configuration is conducive to avoiding insufficient heat exchange caused by the fourth airflow 74 passing through the air duct with a shorter stroke, and improving the heat exchange efficiency of the fourth airflow 74 and the fin assembly 40 without increasing the gas flux. It can be understood that the fourth blocking area 434 is an area without an air duct.

[0072] like Figures 2 to 5 , Figure 8 and Fig. 9 As shown, in one embodiment, the battery pack 100 further includes a first air guide component 81, at least a portion of which is disposed in the first gap 61 and between the fan component 50 and the battery module 20, and the first air guide component 81 is configured to guide the wind blown out of the fan component 50 to the second gap 62 and / or the third gap 63. The first air guide component 81 is provided to facilitate guiding the flow of gas, 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, and 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 flow guide component 82, at least a portion of which is disposed in the fourth gap 64 and between the battery module 20 and the fourth wall 14, and the second flow guide component 82 is configured to guide the rising airflow at the bottom to the first gap 61. By disposing the second flow guide component 82 in the fourth gap 64, it is helpful to reduce the risk of eddy currents in the second gap 62 and improve the cooling efficiency of the airflow on the battery module 20.

[0075] In one embodiment, along the upward direction of the first direction X, the cross-sectional area of ​​the second air guide component 82 gradually decreases, 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 flow guide component 83, at least a portion of which is disposed in the fifth gap 65 and between the battery module 20 and the fifth wall 15, and the third flow guide component 83 is configured to guide the rising airflow at the bottom to the first gap 61. By disposing the third flow guide component 83 in the fifth gap 65, the risk of eddy current in the fifth gap 65 is reduced, and the cooling efficiency of the airflow on the battery module 20 is improved.

[0077] In one embodiment, along the upward direction of the first direction X, the cross-sectional area of ​​the third air guide component 83 gradually decreases, 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 disposed between the fan assembly 50 and the shell 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 beneficial 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 guide component 81 , the second flow guide component 82 , the fourth flow guide component 84 and the third flow guide 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, and the plurality of fan units 51 are arranged along the third direction Z. Such an arrangement is conducive to increasing the gas flow in the battery pack 100, and is particularly suitable for a module with a large number of battery cells 211, and has a good cooling effect for a module with a large number of battery cells 211.

[0082] In one embodiment, the battery module 20 includes a plurality of battery assemblies 21, and the plurality of battery assemblies 21 are arranged along the third direction Z. Each battery assembly 21 includes a plurality of battery cells 211, and the plurality of battery cells 211 in the same battery assembly 21 are arranged along the second direction Y. The battery module 20 including the plurality of battery assemblies 21 can be cooled by the gas-liquid coupling method described in any of the aforementioned embodiments, which is beneficial to greatly improve the temperature rise problem of the battery module 20 and reduce 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 is beneficial to greatly improve the temperature rise problem of the battery module 20 and reduce the temperature difference between different areas of the battery module 20. Optionally, the number of battery assemblies 21 is equal to the number of fan units 51, and one fan unit 51 is 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, movement status, etc. between the 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 on" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element at the same time. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or may be indirectly connected to the other element through an intermediate element.

[0086] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot 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" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a 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 changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied 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 is disposed in the housing, and the liquid cooling assembly is located below the battery module along a first direction; A fin assembly is arranged in the shell, the fin assembly is located on a 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; 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, 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, characterized in that: Along the second direction, the fan assembly is located in the middle of the battery module.

3. The battery pack according to claim 1, characterized in that: 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 communicating with 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; The fourth air duct, the second air duct connects the fourth sub-air inlet and the first air outlet.

4. The battery pack according to claim 3, characterized in that: At least one of the first wind duct, the second wind duct, the third wind duct, and the fourth wind 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 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 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, characterized in that: The battery pack further comprises: a first air guide component, the first air guide component is located between the fan component and the battery module along the first direction, and the first air guide component is configured to guide the wind blown out by the fan component to the surface of the battery module and flow to the first air inlet and the second air inlet respectively; a second air guide component, the second air guide component being located between the battery module and the housing along the third direction, the second air guide component being configured to guide the airflow blown out from the first air outlet to above the battery module; a third air guide component, the third air guide component being located along the third direction on a side of the battery module away from the second air guide component, the third air guide component 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 a 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 comprises 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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