Battery liquid cooling device, battery pack and vehicle

Abstract

The application discloses a battery liquid cooling device, a battery pack and a vehicle, and belongs to the battery liquid cooling field.The battery liquid cooling device comprises a harmonica tube assembly and a current collector assembly; the harmonica tube assembly and the current collector assembly are arranged in layers; the current collector assembly comprises a first current collector and a second current collector; the first current collector and the second current collector are distributed at intervals along a first direction; the first current collector and the second current collector are connected to the same side of the harmonica tube assembly along a third direction; the harmonica tube assembly is in communication with the first current collector; and the harmonica tube assembly is in communication with the second current collector.In the application, the harmonica tube assembly and the current collector assembly are arranged in layers, and the first current collector and the second current collector are distributed at intervals; the first current collector and the second current collector are arranged on the same side of the harmonica tube assembly; and once the battery liquid cooling device is applied to the battery pack, the bottom guard plate of the battery pack can be brought into contact with the harmonica tube assembly, so that the size of the cell assembly of the battery pack can be increased.

Description

Technical Field

[0001] This application belongs to the field of battery liquid cooling, specifically relating to a battery liquid cooling device, a battery pack, and a vehicle. Background Technology

[0002] With the development of technology, vehicles have become a frequently used means of transportation for people's daily travel. Typically, a battery pack is installed in a vehicle to provide power. The battery pack contains battery cells, a liquid cooling system, and a protective plate. The liquid cooling system is in contact with the battery cells, and the protective plate is located on the side of the liquid cooling system facing away from the battery cells. However, in related technologies, the protective plate and liquid cooling system occupy a significant amount of space inside the battery pack, resulting in wasted space and a smaller battery cell size, which is detrimental to improving the energy density of the battery pack. Summary of the Invention

[0003] The purpose of this application is to provide a battery liquid cooling device, a battery pack, and a vehicle, at least to solve the problem that the protective plate and liquid cooling device occupy a lot of space inside the battery pack, resulting in some wasted space, which leads to a smaller size of the battery cell assembly and is not conducive to improving the energy density of the battery pack.

[0004] In a first aspect, embodiments of this application provide a battery liquid cooling device, the battery liquid cooling device comprising: a harmonica tube assembly and a current collector assembly;

[0005] The harmonica tube assembly and the collector assembly are stacked together. The collector assembly includes a first collector and a second collector. Along a first direction, the first collector and the second collector are spaced apart. Along a third direction, the first collector and the second collector are connected to the same side of the harmonica tube assembly. The harmonica tube assembly is connected to the first collector and the harmonica tube assembly is connected to the second collector.

[0006] Optionally, the first collector has a first receiving cavity and a second receiving cavity that are isolated from each other, the second collector has a third receiving cavity, and the harmonica tube assembly includes at least two harmonica tubes;

[0007] The first collector and the second collector are connected to the same surface of at least two of the harmonica tubes, and a portion of the at least two harmonica tubes are in communication with the first receiving cavity, while another portion of the harmonica tubes are in communication with the second receiving cavity, and at least two of the harmonica tubes are in communication with the third receiving cavity.

[0008] Optionally, the first collector includes a first housing, a first cover, and a second cover;

[0009] The first housing is a hollow structure, and the two opposite ends of the first housing have openings that communicate with the interior of the first housing. The interior of the first housing forms the first receiving cavity and the second receiving cavity. The first sealing member covers one of the openings, and the second sealing member covers the other opening.

[0010] Optionally, the first collector further includes a partition plate disposed inside the first housing, and the partition plate is connected to the inner wall of the first housing, the first cover and the second cover respectively, and the partition plate divides the internal space of the first housing into the first receiving cavity and the second receiving cavity along the first direction.

[0011] Optionally, the plurality of harmonica tubes are divided into at least one group of harmonica tubes, the at least one group of harmonica tubes are arranged at intervals along the second direction, each group of harmonica tubes has two tubes, the two harmonica tubes in each group are arranged at intervals along the second direction, one harmonica tube in each group is connected to the first receiving cavity and the third receiving cavity respectively, and the other harmonica tube in each group is connected to the second receiving cavity and the third receiving cavity respectively.

[0012] Optionally, along the first direction, the harmonica tube is provided with a first connecting window and a second connecting window, the first connecting window and the second connecting window being located on the same surface of the harmonica tube, and both the first connecting window and the second connecting window communicating with the interior of the harmonica tube. The first collector is provided with at least two third connecting windows and at least two fourth connecting windows, and the second collector is provided with at least two fifth connecting windows. The third connecting windows communicate with the first receiving cavity, the fourth connecting windows communicate with the second receiving cavity, and the fifth connecting windows communicate with the third receiving cavity.

[0013] The first connecting window on a portion of at least two of the harmonica tubes corresponds to and is connected to at least two of the third connecting windows, the first connecting window on another portion of the harmonica tubes corresponds to and is connected to at least two of the fourth connecting windows, and the fifth connecting window corresponds to and is connected to at least two of the second connecting windows.

[0014] Optionally, the battery liquid cooling device further includes at least two connecting rings;

[0015] The first connected window is connected to the third connected window through the connecting ring, the first connected window is connected to the fourth connected window through the connecting ring, and the fifth connected window is connected to the second connected window through the connecting ring.

[0016] Optionally, the connecting ring includes a first ring body and a second ring body, the first ring body and the second ring body are stacked and connected along the direction of the central axis of the first ring body, the size of the first ring body is smaller than the size of the second ring body, and the interior of the first ring body is in communication with the interior of the second ring body;

[0017] The first connected window has a first ring embedded in it, and the third connected window has a second ring embedded in it, so that the first connected window and the third connected window are connected through the connecting ring; the first connected window has a first ring embedded in it, and the fourth connected window has a second ring embedded in it, so that the first connected window and the fourth connected window are connected through the connecting ring; the second connected window has a first ring embedded in it, and the fifth connected window has a second ring embedded in it, so that the second connected window and the fifth connected window are connected through the connecting ring.

[0018] Optionally, the harmonica tube is provided with a plurality of blocking ribs, the plurality of blocking ribs extending along the first direction and the plurality of blocking ribs being spaced apart, the space between two adjacent blocking ribs forming a fluid channel, and the space between the blocking ribs and the inner wall of the harmonica tube forming the fluid channel.

[0019] The fluid channels are connected to the first connecting window and the second connecting window, respectively.

[0020] Optionally, the battery liquid cooling device further includes a first connector and a second connector;

[0021] Both the first connector and the second connector are connected to the outer surface of the first collector. The first connector is in communication with the first receiving cavity, and the second connector is in communication with the second receiving cavity.

[0022] Secondly, embodiments of this application provide a battery pack, the battery pack including a housing, battery cells, a bottom protective plate, and a battery liquid cooling device as described in any one of the first aspects above;

[0023] The battery cell and the battery liquid cooling device are both disposed in the housing. The electrodes of the battery cell are connected to a bar, the bar is in contact with the harmonica tube assembly, and the surface of the harmonica tube assembly facing away from the bar is in contact with the bottom protective plate.

[0024] Thirdly, embodiments of this application provide a vehicle that includes the battery pack described in the second aspect above.

[0025] In this embodiment, since the harmonica tube assembly and the current collector assembly are stacked, and the first current collector and the second current collector are spaced apart along the first direction, and the first current collector and the second current collector are connected to the same side of the harmonica tube assembly along the third direction, when the battery liquid cooling device provided in this embodiment is applied to a battery pack, the cell assembly in the battery pack can contact the harmonica tube assembly, and the bottom protective plate in the battery pack can contact the surface of the harmonica tube assembly away from the cell assembly, thereby avoiding a gap between the bottom protective plate and the harmonica tube assembly. This is equivalent to eliminating the gap between the bottom protective plate and the harmonica tube in the related technology in the battery pack, thereby increasing the volume of the cell assembly of the battery pack while keeping the volume of the battery pack constant, thus improving the energy density of the battery pack. Furthermore, the harmonica tube assembly is connected to both the first and second current collectors, allowing coolant to enter the first current collector. The coolant in the first current collector then flows to the harmonica tube assembly and subsequently into the second current collector. This allows the harmonica tube assembly to cool the battery pack's cell components, lowering their temperature and mitigating any safety concerns that could arise from the battery pack. In other words, in this embodiment, by stacking the harmonica tube assembly and the current collector assembly, with the first and second current collectors spaced apart and connected to the same side of the harmonica tube assembly, the battery pack's bottom protective plate can contact the harmonica tube assembly once the liquid cooling device is applied to the battery pack. This saves space in the battery pack, allowing for a larger cell component size and increased energy density. Attached Figure Description

[0026] Figure 1 This is a schematic diagram illustrating a battery liquid cooling device provided in an embodiment of this application;

[0027] Figure 2 This is an exploded view of a battery liquid cooling device provided in an embodiment of this application;

[0028] Figure 3 This is an exploded view of a first current collector provided in an embodiment of this application;

[0029] Figure 4 This is an exploded view of a second current collector provided in an embodiment of this application;

[0030] Figure 5 This diagram illustrates a harmonica tube assembly provided in an embodiment of this application.

[0031] Figure 6 This is a partial schematic diagram of a harmonica tube provided in an embodiment of this application;

[0032] Figure 7 This is a second partial schematic diagram of a harmonica tube provided in an embodiment of this application;

[0033] Figure 8 This is a schematic diagram illustrating a battery pack provided in an embodiment of this application.

[0034] Figure label:

[0035] 10: Harmonica tube assembly; 11: Harmonica tube; 111: First communicating window; 112: Second communicating window; 1101: Tube body; 1102: First end cap; 1103: Second end cap; 20: Collector assembly; 21: First collector; 22: Second collector; 211: First receiving cavity; 212: Second receiving cavity; 221: Third receiving cavity; 2101: First housing; 2102: First sealing element; 2103: Second cover; 2104: partition; 2105: third connecting window; 2106: fourth connecting window; 2201: fifth connecting window; 222: second housing; 223: third cover; 224: fourth cover; 30: connecting ring; 31: first ring body; 32: second ring body; 40: first connector; 50: second connector; 100: battery cell; 001: blocking rib; X: first direction; Y: second direction. Detailed Implementation

[0036] The terms "first" and "second" in the specification and claims of this application may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise stated, "multiple" means two or more. Furthermore, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0037] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] Before explaining the battery liquid cooling device provided in the embodiments of this application, the application background of the battery liquid cooling device provided in the embodiments of this application will be specifically described: In related technologies, the battery liquid cooling device includes a harmonica tube assembly, a first current collector, and a second current collector; the harmonica tube assembly includes multiple harmonica tubes. The first current collector and the second current collector are distributed at intervals, and the multiple harmonica tubes are all disposed between the first current collector and the second current collector. The first current collector has a first connecting surface facing the second harmonica tube, and the second current collector has a second connecting surface facing the first harmonica tube. One end of each harmonica tube is inserted into the first connecting surface, and the other end of each harmonica tube is inserted into the second connecting surface, so that each harmonica tube is connected to the first current collector and the second current collector respectively. Thus, once coolant is injected into the first current collector, the coolant can flow to the harmonica tube and then to the second current collector. Afterward, the coolant can flow out from the second current collector, or it can flow back to the first current collector and then flow out from the first current collector. However, in related technologies, with this setup, when the battery liquid cooling device is installed in the battery pack, the harmonica tube contacts the battery pack's cell assembly. The bottom cover of the battery pack is located on the side of the harmonica tube away from the cell assembly. However, due to the presence of the first and second current collectors, there is a gap between the bottom cover and the harmonica tube. This is equivalent to the bottom cover being stacked with the first current collector, and the harmonica tube being located between the first and second current collectors. This is equivalent to multiple harmonica tubes being stacked with the bottom cover. However, the harmonica tube is essentially connected to the vertical surface of the first current collector, resulting in a gap between the harmonica tube and the bottom cover. This leads to a smaller size of the cell assembly, which in turn affects the energy density of the battery pack.

[0040] like Figures 1 to 7 As shown, the battery liquid cooling device includes a harmonica tube assembly 10 and a current collector assembly 20.

[0041] The harmonica tube assembly 10 and the collector assembly 20 are stacked. The collector assembly 20 includes a first collector 21 and a second collector 22. Along the first direction X, the first collector 21 and the second collector 22 are distributed at intervals. Along the third direction Z, the first collector 21 and the second collector 22 are disposed on the same side of the harmonica tube assembly 10. The harmonica tube assembly 10 is connected to the first collector 21 and the harmonica tube assembly 10 is connected to the second collector 22.

[0042] In this embodiment, since the harmonica tube assembly 10 and the current collector assembly 20 are stacked, and the first current collector 21 and the second current collector 22 are spaced apart along the first direction X, and the first current collector 21 and the second current collector 22 are connected to the same side of the harmonica tube assembly along the third direction Z, when the battery liquid cooling device provided in this embodiment is applied to the battery pack, the cell assembly in the battery pack can contact the harmonica tube assembly 10, and the bottom protective plate in the battery pack can contact the surface of the harmonica tube assembly 10 away from the cell assembly, thereby avoiding a gap between the bottom protective plate and the harmonica tube assembly 10. This is equivalent to eliminating the gap between the bottom protective plate and the harmonica tube in the related technology in the battery pack, thereby increasing the volume of the cell assembly in the battery pack while keeping the volume of the battery pack constant, thus improving the energy density of the battery pack. Furthermore, the harmonica tube assembly 10 is connected to the first current collector 21 and the second current collector 22, allowing coolant to enter the first current collector 21. The coolant in the first current collector 21 then flows to the harmonica tube assembly 10 and subsequently into the second current collector 22. This allows the harmonica tube assembly 10 to cool the battery pack's cell components, reducing their temperature and mitigating any safety concerns that might arise from the battery pack. In other words, in this embodiment, by stacking the harmonica tube assembly 10 and the current collector assembly 20, with the first current collector 21 and the second current collector 22 spaced apart and connected to the same side of the harmonica tube assembly, once the battery liquid cooling device is applied to the battery pack, the bottom protective plate of the battery pack can contact the harmonica tube assembly 10, saving space in the battery pack. This allows for an increase in the size of the battery pack's cell components and improves the battery pack's energy density.

[0043] It should be noted that when the battery liquid cooling device is applied to the battery pack, the battery cell assembly in the battery pack has multiple individual battery cells 100 arranged side by side, and each individual battery cell 100 has an electrode. The electrodes of two adjacent battery cells 100 are connected by a switch plate, that is, the electrode of one of two adjacent battery cells 100 is connected to the switch plate, and the electrode of the other of two adjacent battery cells 100 is also connected to the switch plate. When the battery cells are inverted, the switch plate comes into contact with the harmonica tube assembly 10, thereby cooling the switch plate and thus cooling the electrodes of the individual battery cells 100, preventing the electrodes of the individual battery cells 100 from becoming too hot and affecting the safety of the battery pack.

[0044] Additionally, in this embodiment, the third-party direction Z can be a direction parallel to the stacking direction of the harmonica tube assembly 10 and the collector assembly 20.

[0045] In some embodiments, the first collector 21 has a first receiving cavity 211 and a second receiving cavity 212 that are isolated from each other, the second collector 22 has a third receiving cavity 221, and the harmonica tube assembly 10 includes at least two harmonica tubes 11; the first collector 21 and the second collector 22 are connected to the same surface of the at least two harmonica tubes 11, and a portion of the at least two harmonica tubes 11 communicates with the first receiving cavity 211, while another portion of the harmonica tubes 11 communicates with the second receiving cavity 212, and both at least two harmonica tubes 11 communicate with the third receiving cavity 221.

[0046] Since at least two harmonica tubes 11 are partially connected to the first receiving cavity 211 and partially connected to the second receiving cavity 212, and at least two harmonica tubes 11 are connected to the third receiving cavity 221, and the first receiving cavity 211 and the second receiving cavity 212 are isolated from each other, once coolant flows into the first receiving cavity 211 of the first current collector 21, the coolant can flow to the harmonica tubes 11 connected to the first receiving cavity 211, and after flowing through this part of the harmonica tubes 11, the coolant can flow into the third receiving cavity 221 of the second current collector 22, and the coolant can flow into the harmonica tubes 11 connected to the second receiving cavity 212 of the first current collector 21 in the third receiving cavity 221, and then flow to the second receiving cavity 212 through this part of the harmonica tubes 11. Thus, it is equivalent to the coolant flowing through all the harmonica tubes 11, so that the harmonica tubes 11 can cool the battery pack's cell components. Furthermore, the coolant can continuously flow into the first receiving cavity 211, then through the harmonica tube 11 to the third receiving cavity 221 of the second current collector 22, and then through the harmonica tube 11 back to the second receiving cavity 212. This allows the coolant to flow out of the second receiving cavity 212, ensuring continuous flow. This continuous flow of coolant through the harmonica tube 11 improves the cooling effect on the battery cell assembly. Additionally, the first current collector 21 has mutually isolated first and second receiving cavities 211 and 212, effectively allowing the first current collector 21 to divert coolant, thus avoiding the need for additional diversion components in the battery liquid cooling system.

[0047] Of course, in this embodiment, the first collector 21 can be interconnected with the first receiving cavity 211 and the second receiving cavity 212, the second collector 22 has a third receiving cavity 221, and the harmonica tube assembly 10 includes at least two harmonica tubes 11; the first collector 21 and the second collector 22 are connected to the same surface of the at least two harmonica tubes 11, and a portion of the at least two harmonica tubes 11 is connected to the first receiving cavity 211, another portion of the harmonica tubes 11 is connected to the second receiving cavity 212, and both at least two harmonica tubes 11 are connected to the third receiving cavity 221. This allows coolant to flow into the first receiving cavity 211 and the second receiving cavity 212, and the coolant flows through the harmonica tubes 11 and then into the third receiving cavity 221, after which the coolant flows out of the third receiving cavity 221.

[0048] It should be noted that when the battery liquid cooling device is applied in the battery pack, the battery cell assembly, the first current collector 21 and the second current collector 22 can be located on the same side of the harmonica tube assembly 10 in the third direction Z, and the surface of the battery cell assembly in contact with the harmonica tube 11 is the same surface as the surface of the first current collector 21 connected to the harmonica tube 11. The bottom cover can contact the surface of the battery cell assembly on the back of the harmonica tube 11.

[0049] In addition, in some embodiments, the first collector 21 includes a first housing 2101, a first cover 2102, and a second cover 2103; the first housing 2101 is a hollow structure, and the two opposite ends of the first housing 2101 have openings that communicate with the interior of the first housing 2101. The interior of the first housing 2101 forms a first receiving cavity 211 and a second receiving cavity 212. The first cover 2102 covers one opening, and the second cover 2103 covers the other opening.

[0050] Since the first housing 2101 is a hollow structure, it can have internal space, thus ensuring that a first receiving cavity 211 and a second receiving cavity 212 can be formed inside the first housing 2101. Because the first housing 2101 has openings at opposite ends that communicate with its interior, a first sealing member 2102 can cover one opening, and a second sealing member 2103 can cover the other opening. This seals the openings at opposite ends of the first housing 2101, preventing coolant leakage in both the first and second receiving cavities. In other words, by providing the first sealing member 2102 and the second sealing member 2103, both the first receiving cavity 211 and the second receiving cavity 212 are ensured to be closed cavities, preventing coolant leakage.

[0051] It should be noted that, in the embodiments of this application, the second collector 22 may include a second housing 222, a third cover 223 and a fourth cover 224. The second housing 222 is a hollow structure and has openings at opposite ends. The openings communicate with the interior of the second housing 222. A third receiving cavity 221 is formed inside the second housing 222. The third cover 223 covers one opening and the fourth cover 224 covers the other opening.

[0052] In addition, in some embodiments, the first collector 21 further includes a partition 2104, which is disposed inside the first housing 2101 and is connected to the inner wall of the first housing 2101, the first cover 2102 and the second cover 2103 respectively. The partition 2104 divides the internal space of the first housing 2101 into a first receiving cavity 211 and a second receiving cavity 212 along the first direction X.

[0053] Since the partition 2104 is disposed inside the first housing 2101, the internal space of the first housing 2101 is divided along the first direction X into a first receiving cavity 211 and a second receiving cavity 212. Furthermore, the partition 2104 is connected to the inner wall of the first housing 2101, the first cover 2102, and the second cover 2103, respectively, thereby ensuring that the first receiving cavity 211 and the second receiving cavity 212 are isolated from each other, and that both the first receiving cavity 211 and the second receiving cavity 212 are sealed by the first cover 2102 and the second cover 2103, preventing leakage of coolant from the first receiving cavity 211 and the second receiving cavity 212.

[0054] It should be noted that the first cover 2102 can be welded to the opening of the first housing 2101 to seal the opening of the first housing 2101. The second cover 2103 can also be welded to another opening of the first housing 2101 to seal that opening.

[0055] In some embodiments, the multiple harmonica tubes 11 are divided into at least one group of harmonica tubes 11, and the at least one group of harmonica tubes 11 is arranged at intervals along the second direction Y. The number of harmonica tubes 11 in each group is two, and the two harmonica tubes 11 in each group are arranged at intervals along the second direction Y. One harmonica tube 11 in each group is connected to the first receiving cavity 211 and the third receiving cavity 221 respectively, and the other harmonica tube 11 in each group is connected to the second receiving cavity 212 and the third receiving cavity 221 respectively.

[0056] Since one harmonica tube 11 in each group of harmonica tubes 11 is connected to the first receiving cavity 211 and the third receiving cavity 221 respectively, and the other harmonica tube 11 in each group of harmonica tubes 11 is connected to the second receiving cavity 212 and the third receiving cavity 221 respectively, once the coolant flows into the first receiving cavity 211, the coolant can flow into the harmonica tube 11 connected to the first receiving cavity 211, and then flow into the third receiving cavity 221 through the harmonica tube 11. The coolant also flows from the third receiving cavity 221 to the other harmonica tube 11 in each group of harmonica tubes 11 and then into the second receiving cavity 212. This is equivalent to the coolant flowing through each harmonica tube 11 in each group of harmonica tubes 11, ensuring that each harmonica tube 11 can cool the battery cell assembly. Furthermore, the two harmonica tubes 11 in each group are arranged at intervals along the second direction Y. This ensures that after the coolant in one harmonica tube 11 flows into the third receiving cavity 221, the coolant in the third receiving cavity 221 flows into the other harmonica tube 11 in each group, avoiding the problem of different groups of harmonica tubes interfering with the coolant return to the second receiving cavity 212. In other words, by arranging the two harmonica tubes 11 in each group at intervals along the second direction Y, the flow of coolant in each group of harmonica tubes is facilitated.

[0057] In some embodiments, along the first direction X, the harmonica tube 11 is provided with a first connecting window 111 and a second connecting window 112. The first connecting window 111 and the second connecting window 112 are located on the same surface of the harmonica tube 11, and both the first connecting window 111 and the second connecting window 112 are connected to the interior of the harmonica tube 11. The first collector 21 is provided with at least two third connecting windows 2105 and at least two fourth connecting windows 2106, and the second collector 22 is provided with at least two fifth connecting windows 2201. The third connecting windows 2105 and the first... The receiving cavity 211 is connected, the fourth connecting window 2106 is connected to the second receiving cavity 212, and the fifth connecting window 2201 is connected to the third receiving cavity 221; the first connecting window 111 on a portion of the at least two harmonica tubes 11 corresponds to and is connected to at least two third connecting windows 2105, the first connecting window 111 on the other portion of the at least two harmonica tubes 11 corresponds to and is connected to at least two fourth connecting windows 2106, and the at least two fifth connecting windows 2201 correspond to and are connected to at least two second connecting windows 112.

[0058] Since both the first connecting window 111 and the second connecting window 112 are connected to the interior of the harmonica tube 11, once the coolant flows to the first connecting window 111, the coolant can flow through the first connecting window 111 into the harmonica tube 11, and the coolant can flow out of the harmonica tube 11 from the second connecting window 112. Since the third connecting window 2105 is connected to the first receiving cavity 211, the fourth connecting window 2106 is connected to the second receiving cavity 212, and the fifth connecting window 2201 is connected to the third receiving cavity 221, the coolant in the first receiving cavity 211 can flow out of the first receiving cavity 211 through the third connecting window 2105, and the coolant can flow into the second receiving cavity 212 through the fourth connecting window 2106. The coolant can also flow into the third receiving cavity 221 through the fifth connecting window 2201 and out of the third receiving cavity 221. Since the first connecting windows 111 on a portion of at least two harmonica tubes 11 correspond one-to-one with and are connected to at least two third connecting windows 2105, the first connecting windows 111 on the remaining portions of the at least two harmonica tubes 11 correspond one-to-one with and are connected to at least two fourth connecting windows 2106, and the at least two fifth connecting windows 2201 correspond one-to-one with and are connected to at least two second connecting windows 112, once the coolant flows into the first receiving cavity 211, the coolant can flow through the third connecting window 2105 to the corresponding first connecting window 111. The coolant flows into the harmonica tube 11, then through the second connecting window 112 to the fifth connecting window 2201, and into the third receiving cavity 221. The coolant in the third receiving cavity 221 can then flow out of the third receiving cavity 221 through another fifth connecting window 2201, and into another second connecting window 112 and into another harmonica tube 11. After that, it flows into the second receiving cavity 212 through the first connecting window 111 of the harmonica tube 11, thereby facilitating the flow of coolant and ensuring that coolant can flow through each harmonica tube 11.

[0059] It should be noted that the harmonica tube 11 may include a tube body 1101, a first end cap 1102 and a second end cap 1103. The tube body 1101 is a hollow interface, and the tube openings at opposite ends of the tube body 1101 are connected to the interior of the tube body 1101. The first end cap 1102 is placed over one tube opening, and the second end cap 1103 is placed over the other tube opening.

[0060] In addition, in this embodiment, when there are two third connecting windows 2105, the two third connecting windows 2105 can be arranged symmetrically with respect to the center of the first collector 21. Similarly, when there are two fourth connecting windows 2106, the two fourth connecting windows 2106 can be arranged symmetrically with respect to the center of the first collector 21.

[0061] In some embodiments, the battery liquid cooling device may further include at least two connecting rings 30; the first connecting window 111 is connected to the third connecting window 2105 through the connecting rings 30, the first connecting window 111 is connected to the fourth connecting window 2106 through the connecting rings 30, and the fifth connecting window 2201 is connected to the second connecting window 112 through the connecting rings 30. By providing the connecting rings 30, it is convenient to connect the first connecting window 111 to the third connecting window 2105, to the first connecting window 111 to the fourth connecting window 2106, and to the fifth connecting window 2201 to the second connecting window 112.

[0062] It should be noted that the connecting ring 30 can be welded to the corresponding connecting window.

[0063] In some embodiments, the connecting ring 30 may include a first ring body 31 and a second ring body 32, which are stacked and connected along the central axis of the first ring body 31. The size of the first ring body 31 is smaller than that of the second ring body 32, and the interior of the first ring body 31 is connected to the interior of the second ring body 32. The first ring body 31 is embedded in the first connecting window 111, and the second ring body 32 is embedded in the third connecting window 2105, so that the first connecting window 111 and the third connecting window 2105 are connected through the connecting ring 30. The first ring body 31 is embedded in the first connecting window 111, and the second ring body 32 is embedded in the fourth connecting window 2106, so that the first connecting window 111 and the fourth connecting window 2106 are connected through the connecting ring 30. The first ring body 31 is embedded in the second connecting window 112, and the second ring body 32 is embedded in the fifth connecting window 2201, so that the second connecting window 112 and the fifth connecting window 2201 are connected through the connecting ring 30.

[0064] Since the first ring 31 and the second ring 32 are stacked and connected along the central axis of the first ring 31, the interior of the first ring 31 is connected to the interior of the second ring 32. Due to the size of the first ring 31 and the second ring 32, when using the connecting ring 30, the sizes of the connecting windows on the first current collector 21, the second current collector 22, and the harmonica tube 11 can be different. Specifically, the first ring 31 can be embedded in the first connecting window 111, and the second ring 32 can be embedded in the third connecting window 2105. This means that the size of the first connecting window 111 on the harmonica tube 11 is smaller than the size of the third connecting window 2105 on the first current collector 21. In other words, a smaller connecting window is opened on the harmonica tube 11, and a larger connecting window is opened on the first current collector 21. This avoids the problem that a larger connecting window on the harmonica tube 11 would affect the strength of the harmonica tube 11 and hinder its ability to cool the battery cell assembly. Similarly, a first ring body 31 is embedded in the first connecting window 111, a second ring body 32 is embedded in the fourth connecting window 2106, a first ring body 31 is embedded in the second connecting window 112, and a second ring body 32 is embedded in the fifth connecting window 2201, so that the second connecting window 112 and the fifth connecting window 2201 are connected by a connecting ring 30. This ensures that the size of the connecting window on the harmonica tube 11 is small, avoiding the problem of the connecting window on the harmonica tube 11 being too large.

[0065] Of course, in this embodiment, the connecting ring 30 may also include only a single ring body. In this case, when the first connecting window 111 and the third connecting window 2105 need to be connected through the connecting ring 30, a part of the connecting ring 30 can be embedded in the first connecting window, and the other part of the connecting ring 30 can be embedded in the third connecting window 2105, so that the first connecting window 111 and the third connecting window 2105 are connected and communicated. Similarly, when the first connecting window 111 and the fourth connecting window 2106 need to be connected through the connecting ring 30, a portion of the connecting ring 30 can be embedded in the first connecting tube window, and the other portion of the connecting ring 30 can be embedded in the fourth connecting window 2106, thus connecting and communicating the first connecting window 111 and the fourth connecting window 2106. When the fifth connecting window 2201 and the second connecting window 112 need to be connected through the connecting ring 30, a portion of the connecting ring 30 can be embedded in the fifth connecting tube window, and the other portion of the connecting ring 30 can be embedded in the second connecting window 112, thus connecting and communicating the fifth connecting window 2201 and the second connecting window 112.

[0066] It should be noted that the first connecting window 111 to the fifth connecting window 2201 can all be countersunk holes.

[0067] Furthermore, in this embodiment, the shapes of the first connecting window 111, the second connecting window 112, the third connecting window 2105, the fourth connecting window 2106, and the fifth connecting window 2201 can all be set according to actual needs. For example, the shapes of the first connecting window 111, the second connecting window 112, the first connecting window 111, the second connecting window 112, and the first connecting window 111 can all be square; or, for another example, the shapes of the first connecting window 111, the second connecting window 112, the first connecting window 111, the second connecting window 112, and the first connecting window 111 can all be circular. This embodiment does not limit the shape of the connecting window 111. Additionally, the shape of the connecting ring 30 can be the same as the shape of the first connecting window 111.

[0068] In addition, in some embodiments, the harmonica tube 11 may be provided with a plurality of blocking ribs 001, which extend along the first direction X and are spaced apart. The space between two adjacent blocking ribs 001 forms a fluid channel, and the space between the blocking ribs 001 and the inner wall of the harmonica tube 11 forms a fluid channel. The fluid channels are respectively connected to the first connecting window 111 and the second connecting window 112.

[0069] Because multiple baffle ribs 001 extend along the first direction X and are spaced apart, a fluid channel is formed between two adjacent baffle ribs 001, and a fluid channel is also formed between the baffle ribs 001 and the inner wall of the harmonica tube 11. This allows the coolant to flow through multiple fluid channels after entering the harmonica tube 11, ensuring smooth flow and maximizing the amount of coolant occupying the internal space of the harmonica tube 11, thus ensuring a good cooling effect. Furthermore, the fluid channels are connected to both the first connecting window 111 and the second connecting window 112, meaning that multiple fluid channels are connected to both. This ensures that after the coolant enters the harmonica tube 11 through the first connecting window 111, coolant flows into each fluid channel, and the coolant in each channel can flow out of the harmonica tube 11 through the second connecting window 112, effectively preventing the formation of dead zones in the coolant flow within the harmonica tube 11.

[0070] In addition, in some embodiments, the battery liquid cooling device may also include a first connector 40 and a second connector 50; both the first connector 40 and the second connector 50 are connected to the outer surface of the first collector 21, the first connector 40 is connected to the first receiving cavity 211, and the second connector 50 is connected to the second receiving cavity 212.

[0071] Since the first connector 40 is connected to the first receiving cavity 211 and the second connector 50 is connected to the second receiving cavity 212, coolant can be injected into the first receiving cavity 211 through the first connector 40, and coolant in the second receiving cavity 212 can flow out through the second connector 50; conversely, coolant can be injected into the second receiving cavity 212 through the second connector 50, and coolant in the first receiving cavity 211 can flow out through the first connector 40. Furthermore, by providing the first connector 40 and the second connector 50, when the battery liquid cooling device is applied in a battery pack, it can be connected to the coolant-supplying components in the battery pack through the first connector 40 and the second connector 50 to achieve coolant circulation. Additionally, by providing the first connector 40 and the second connector 50, it is equivalent to achieving overall coolant flow in the battery liquid cooling device through only two connectors, thereby saving the number of connectors in the battery liquid cooling device, reducing the number of pipes connecting the battery pack to the connectors, and lowering costs.

[0072] In addition, in this embodiment of the application, the width of the harmonica tube 11 can be 20-80mm, the length of the harmonica tube 11 can be 1000mm-2000mm, and the height of the harmonica tube 11 can be 2-4mm.

[0073] In addition, in this embodiment of the application, the length range of the first collector 21 and the length range of the second collector 22 can both be 200-400mm, the length range of the first receiving cavity 211 and the length range of the second receiving cavity 212 can both be 10-20mm, and the height range of the first receiving cavity 211 and the height range of the second receiving cavity 212 can both be 2-5mm.

[0074] This application provides a battery pack, such as... Figure 8 As shown, the battery pack includes a housing, a cell assembly, a bottom protective plate, and a battery liquid cooling device as described in any of the above embodiments; the cell assembly and the battery liquid cooling device are both disposed in the housing, the electrodes of the cell assembly are connected to a bar, the bar is in contact with the harmonica tube assembly 10, and the surface of the harmonica tube assembly 10 facing away from the bar is in contact with the bottom protective plate.

[0075] The battery cell assembly includes multiple individual battery cells 100.

[0076] This application provides a vehicle, characterized in that the vehicle includes the battery pack described in the above embodiments.

[0077] It should be noted that, in the embodiments of this application, the types of vehicles include, but are not limited to, hybrid vehicles, electric vehicles, etc.

[0078] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0079] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery liquid cooling device, characterized in that, The battery liquid cooling device includes: a harmonica tube assembly (10) and a current collector assembly (20); The harmonica tube assembly (10) and the collector assembly (20) are stacked together. The collector assembly (20) includes a first collector (21) and a second collector (22). Along a first direction (X), the first collector (21) and the second collector (22) are spaced apart. Along a third direction (Z), the first collector (21) and the second collector (22) are located on the same side of the harmonica tube assembly (10). The harmonica tube assembly (10) is connected to the first collector (21) and the harmonica tube assembly (10) is connected to the second collector (22).

2. The battery liquid cooling device according to claim 1, characterized in that, The first collector (21) has a first receiving cavity (211) and a second receiving cavity (212) that are isolated from each other, the second collector (22) has a third receiving cavity (221), and the harmonica tube assembly (10) includes at least two harmonica tubes (11); The first collector (21) and the second collector (22) are connected to the same surface of at least two of the harmonica tubes (11), and a portion of the harmonica tubes (11) are connected to the first receiving cavity (211), while another portion of the harmonica tubes (11) are connected to the second receiving cavity (212). At least two of the harmonica tubes (11) are connected to the third receiving cavity (221).

3. The battery liquid cooling device according to claim 2, characterized in that, The first collector (21) includes a first housing (2101), a first cover (2102), and a second cover (2103); The first housing (2101) is a hollow structure, and the first housing (2101) has openings at opposite ends. The openings communicate with the interior of the first housing (2101). The interior of the first housing (2101) forms the first receiving cavity (211) and the second receiving cavity (212). The first cover (2102) covers one of the openings, and the second cover (2103) covers the other opening.

4. The battery liquid cooling device according to claim 3, characterized in that, The first collector (21) further includes a partition (2104), which is disposed inside the first housing (2101) and is connected to the inner wall of the first housing (2101), the first cover (2102) and the second cover (2103) respectively. The partition (2104) divides the internal space of the first housing (2101) into the first receiving cavity (211) and the second receiving cavity (212) along the first direction (X).

5. The battery liquid cooling device according to any one of claims 2-4, characterized in that, The plurality of harmonica tubes (11) are divided into at least one group of harmonica tubes (11), and the at least one group of harmonica tubes (11) is arranged at intervals along the second direction (Y). The number of harmonica tubes (11) in each group is two. The two harmonica tubes (11) in each group are arranged at intervals along the second direction (Y). One harmonica tube (11) in each group is connected to the first receiving cavity (211) and the third receiving cavity (221) respectively. The other harmonica tube (11) in each group is connected to the second receiving cavity (212) and the third receiving cavity (221) respectively.

6. The battery liquid cooling device according to any one of claims 2-4, characterized in that, Along the first direction (X), the harmonica tube (11) is provided with a first connecting window (111) and a second connecting window (112). The first connecting window (111) and the second connecting window (112) are located on the same surface of the harmonica tube (11), and both the first connecting window (111) and the second connecting window (112) are connected to the interior of the harmonica tube (11). The first collector (21) is provided with at least two third connecting windows (2105) and at least two fourth connecting windows (2106). The second collector (22) is provided with at least two fifth connecting windows (2201). The third connecting window (2105) is connected to the first receiving cavity (211), the fourth connecting window (2106) is connected to the second receiving cavity (212), and the fifth connecting window (2201) is connected to the third receiving cavity (221). The first connecting window (111) on a portion of at least two of the harmonica tubes (11) corresponds to and is connected to at least two of the third connecting windows (2105), the first connecting window (111) on another portion of the harmonica tubes (11) corresponds to and is connected to at least two of the fourth connecting windows (2106), and the fifth connecting window (2201) corresponds to and is connected to at least two of the second connecting windows (112).

7. The battery liquid cooling device according to claim 6, characterized in that, The battery liquid cooling device also includes at least two connecting rings (30); The first connecting window (111) is connected to the third connecting window (2105) through the connecting ring (30), the first connecting window (111) is connected to the fourth connecting window (2106) through the connecting ring (30), and the fifth connecting window (2201) is connected to the second connecting window (112) through the connecting ring (30).

8. The battery liquid cooling device according to claim 7, characterized in that, The connecting ring (30) includes a first ring body (31) and a second ring body (32). The first ring body (31) and the second ring body (32) are stacked and connected along the direction of the central axis of the first ring body (31). The size of the first ring body (31) is smaller than the size of the second ring body (32), and the interior of the first ring body (31) is connected to the interior of the second ring body (32). The first connecting window (111) has the first ring body (31) embedded in it, and the third connecting window (2105) has the second ring body (32) embedded in it, so that the first connecting window (111) and the third connecting window (2105) are connected through the connecting ring (30); the first connecting window (111) has the first ring body (31) embedded in it, and the fourth connecting window (2106) has the second ring body (32) embedded in it, so that the first connecting window (111) and the fourth connecting window (2106) are connected through the connecting ring (30); the second connecting window (112) has the first ring body (31) embedded in it, and the fifth connecting window (2201) has the second ring body (32) embedded in it, so that the second connecting window (112) and the fifth connecting window (2201) are connected through the connecting ring (30).

9. The battery liquid cooling device according to claim 6, characterized in that, The harmonica tube (11) is provided with a plurality of blocking ribs (001), which extend along the first direction (X) and are spaced apart. The space between two adjacent blocking ribs (001) forms a fluid channel, and the space between the blocking ribs (001) and the inner wall of the harmonica tube (11) forms the fluid channel. The fluid channels are connected to the first connecting window (111) and the second connecting window (112), respectively.

10. The battery liquid cooling device according to any one of claims 2-4, characterized in that, The battery liquid cooling device also includes a first connector (40) and a second connector (50); The first connector (40) and the second connector (50) are both connected to the outer surface of the first collector (21). The first connector (40) is connected to the first receiving cavity (211), and the second connector (50) is connected to the second receiving cavity (212).

11. A battery pack, characterized in that, The battery pack includes a housing, a cell assembly, a bottom protective plate, and a battery liquid cooling device according to any one of claims 1-10; The battery cell and the battery liquid cooling device are both disposed in the housing. The electrodes of the battery cell assembly are connected to a bar plate. The bar plate is in contact with the harmonica tube assembly (10). The surface of the harmonica tube assembly (10) facing away from the bar plate is in contact with the bottom protective plate.

12. A vehicle, characterized in that, The vehicle includes the battery pack as described in claim 11.

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