Battery pack

Abstract

The utility model discloses a battery pack. The battery pack comprises a shell, a battery cell assembly and a liquid cooling plate, the battery cell assembly is arranged in the shell, the liquid cooling plate is arranged in the shell, the liquid cooling plate is provided with a liquid cooling channel and a first airflow channel, and the first airflow channel is provided with an air inlet and an air outlet. The daughter board for liquid cooling is communicated with the mother board through the liquid guide pipeline, and cooling liquid enters the liquid cooling channel through the liquid guide pipeline. The liquid guide pipeline comprises a liquid inlet end and a liquid outlet end, the liquid inlet end is communicated with the daughter board, the liquid outlet end comprises a first section and a second section, a liquid outlet of the first section is located in the liquid cooling channel of the mother board, a liquid inlet of the second section is located in the liquid cooling channel of the mother board, and cooling liquid flows into the liquid cooling channel of the mother board from the liquid outlet of the first section and then flows into the daughter board. And the liquid is led out of the shell through the liquid inlet of the second section. Therefore, according to the scheme, the safety of the battery pack can be improved by cooling the gas in the first gas flow channel when the battery cell assembly is subjected to thermal runaway, and through the design of the first section and the second section, the installation and the later maintenance are convenient.

Description

Technical Field

[0001] The utility model relates to the field of new energy materials, in particular to a battery pack. Background Art

[0002] With growing global awareness of environmental protection and the gradual implementation of relevant regulations and policies, electric vehicles (EVs), as a green transportation tool, are gradually gaining a dominant position in the market. As the core power source of EVs, the performance of lithium batteries directly impacts key performance indicators such as vehicle safety, range, and lifespan. However, in practice, lithium batteries generate significant heat during operation. If this heat cannot be effectively dissipated, the battery temperature will rise, affecting its performance and lifespan, and may even lead to safety hazards such as thermal runaway.

[0003] When lithium batteries are operating, the complex chemical reactions within them generate a significant amount of heat. For example, the cells within traditional battery packs are typically tightly packed to reduce size and increase energy density. However, this arrangement also results in longer heat conduction paths between the cells, making it difficult for heat to dissipate quickly. This also limits air flow within the battery pack, creating spaces where heat can accumulate. If this heat cannot be effectively and promptly removed from the battery pack, the battery temperature will rise rapidly, which will not only accelerate battery aging and shorten its service life, but may also lead to serious safety issues such as thermal runaway. Furthermore, temperature differences within the battery pack can cause uneven internal resistance and capacity between cells, further reducing the battery's overall performance. Utility Model Content

[0004] The main purpose of the present utility model is to propose a battery pack that can improve the safety of the battery pack by cooling the gas in the first air flow channel when thermal runaway occurs in the battery cell assembly, and through the design of the first section and the second section, the battery pack of this solution is easy to install and facilitate subsequent maintenance.

[0005] To achieve the above objectives, some embodiments of the present invention provide a battery pack, comprising:

[0006] case;

[0007] A battery cell assembly is disposed in the housing;

[0008] A liquid cooling plate is provided in the shell, the liquid cooling plate is attached to the battery cell assembly or the liquid cooling plate and the battery cell assembly are spaced apart to cool the battery cell assembly, and a liquid cooling channel and a first air flow channel are provided in the liquid cooling plate, which are isolated from each other. The first air flow channel has an air inlet and an air outlet, the air inlet is used to obtain gas generated after thermal runaway of the battery cell assembly, and the air outlet is used to discharge the gas in the first air flow channel out of the shell; the liquid cooling plate also includes a motherboard and a daughterboard, and the motherboard and the daughterboard are both provided with a liquid cooling channel and a first air flow channel. The battery pack includes a liquid guide pipe, and the liquid cooling channel of the daughterboard is connected to the liquid cooling channel of the motherboard through the liquid guide pipe, and the cooling liquid enters the liquid cooling channels of the daughterboard and the motherboard through the liquid guide pipe;

[0009] The liquid guide pipe includes a liquid inlet end and a liquid outlet end. The liquid inlet end is connected to the daughter board, and the liquid outlet end includes a first segment and a second segment. The first segment and the second segment are respectively located on opposite sides of the motherboard. The liquid outlet of the first segment is connected to the liquid cooling channel of the motherboard, and the liquid inlet of the second segment is connected to the liquid cooling channel of the motherboard. After the cooling liquid flows into the liquid cooling channel of the motherboard from the liquid outlet of the first segment, it is discharged from the shell through the liquid inlet of the second segment.

[0010] In some embodiments, the liquid cooling channel is located above the first air flow channel in the vertical direction, the shell has a first direction, the liquid cooling channel and the first air flow channel both extend along the first direction, and the first direction intersects the vertical direction.

[0011] In some embodiments, the liquid cooling plate includes multiple sub-boards, the battery cell assembly includes battery cells, the multiple sub-boards are arranged at intervals along the second direction, the battery cells are located between the multiple sub-boards and / or the battery cells are located between the sub-boards and the motherboard, and the battery cells are suitable for bonding.

[0012] In some embodiments, the battery cell includes a first explosion-proof valve, the housing includes a mounting position, the mounting position includes a first opening, the battery cell is mounted at the mounting position, and the first explosion-proof valve covers the first opening;

[0013] The shell includes a second air flow channel, which is arranged on the bottom plate of the shell that supports the battery cell. The first opening is connected to the second air flow channel, the second air flow channel is connected to the first air flow channel, and the first opening is configured as an air inlet.

[0014] In some embodiments, the second airflow channel extends along a second direction, the motherboard includes a second opening, and the second opening connects the first airflow channel and the second airflow channel; and / or,

[0015] The sub-plate includes a second opening, and the second opening is connected to the first air flow channel and the second air flow channel.

[0016] In some embodiments, along the second direction, the first segment is arc-shaped near the motherboard.

[0017] In some embodiments, the housing includes a third air flow channel, the liquid cooling plate includes a third opening, and the third opening connects the first air flow channel and the third air flow channel;

[0018] The battery pack includes a second explosion-proof valve, the shell includes a mounting hole, the second explosion-proof valve is installed in the mounting hole, the mounting hole is connected to the third air flow channel, and the mounting hole is configured as an air outlet.

[0019] In some embodiments, the battery pack includes an air duct, which connects the daughter board and the mother board. The air duct includes an air outlet end, which is located in the first air flow channel of the mother board. The third opening connects the first air flow channel and the third air flow channel of the mother board.

[0020] In some embodiments, the third air flow channel surrounds the peripheral wall plate of the housing, and the third air flow channel is disposed in the peripheral wall plate.

[0021] In some embodiments, two ports of the air duct are disposed opposite to each other in the first air flow channel of the motherboard along a first direction, and both ports of the air duct are configured as air outlets.

[0022] According to the above embodiments, the beneficial effects of the present invention are:

[0023] The battery pack of the present invention includes a shell, a battery cell assembly and a liquid cooling plate. The battery cell assembly and the liquid cooling plate are both arranged in the shell. The liquid cooling plate is provided with a liquid cooling channel and a first air flow channel that are isolated from each other. The liquid cooling plate is attached to the battery cell assembly or the liquid cooling plate and the battery cell assembly are arranged at intervals to cool the battery cell assembly. The first air flow channel has an air inlet and an air outlet. The air inlet is used to obtain the gas generated after the battery cell assembly has a thermal runaway, and the air outlet is used to discharge the gas in the first air flow channel out of the shell. The liquid cooling channel and the first air flow channel are provided on the liquid cooling plate at the same time. When the cooling liquid flows in the liquid cooling channel, it can not only directly cool the battery cell assembly, but also improve the safety of the battery pack by cooling the gas in the first air flow channel when the battery cell assembly has a thermal runaway.

[0024] The liquid cooling plate further comprises a motherboard and a daughterboard, both of which are provided with a liquid cooling channel and a first air flow channel. The battery pack comprises a liquid guide pipe, and the liquid cooling channel of the daughterboard is connected to the liquid cooling channel of the motherboard through the liquid guide pipe, and the cooling liquid enters the liquid cooling channel of the daughterboard and the motherboard through the liquid guide pipe. The liquid guide pipe comprises a liquid inlet and a liquid outlet, the liquid inlet is connected to the daughterboard, and the liquid outlet comprises a first segment and a second segment, the liquid outlet of the first segment is located in the liquid cooling channel of the motherboard, and the liquid inlet of the second segment is located in the liquid cooling channel of the motherboard, and the cooling liquid flows into the liquid cooling channel of the motherboard from the liquid outlet of the first segment, and then is discharged from the shell through the liquid inlet of the second segment. At this time, the cooling liquid from the liquid guide pipe enters the liquid cooling channel of the motherboard from the liquid outlet of the first segment, and the cooling liquid continues to flow into the liquid cooling channel of the motherboard from the liquid outlet of the first segment. After the cooling liquid has filled the liquid cooling channel of the motherboard, the cooling liquid is squeezed out of the shell from the liquid cooling channel of the motherboard through the liquid inlet of the second segment due to pressure. This configuration is simple in structure, easy to install and maintain, and allows the motherboard to fully participate in heat exchange with the battery cells.

[0025] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0027] Figure 1 This is a schematic diagram of the overall structure of a battery pack in one embodiment of the present utility model;

[0028] Figure 2 for Figure 1 Schematic diagram of the structure of the middle battery pack after the upper cover is hidden;

[0029] Figure 3 for Figure 2 Schematic diagram of the structure of the battery pack after the battery cell components are hidden;

[0030] Figure 4 This is a schematic structural diagram of a battery cell in one embodiment of the present utility model;

[0031] Figure 5 This is a schematic diagram of the cross-sectional structure of a battery pack in one embodiment of the present invention observed along a first viewing angle, intended to illustrate the relevant structure of the liquid-conducting channel;

[0032] Figure 6 for Figure 5 Enlarged view of point A in the middle;

[0033] Figure 7 for Figure 5 Enlarged view of point B in the middle;

[0034] Figure 8 This is a schematic diagram of the cross-sectional structure of the battery pack in one embodiment of the present invention observed from a second viewing angle, intended to illustrate the related structures of the liquid duct and the gas duct;

[0035] Figure 9 for Figure 8 Enlarged view of point C in the middle;

[0036] Figure 10 This is a schematic diagram of the cross-sectional structure of the battery pack in one embodiment of the present invention observed along a third viewing angle, intended to illustrate the relevant structure of the first opening;

[0037] Figure 11 for Figure 10 Enlarged view of point D in the middle;

[0038] Figure 12 This is a schematic diagram of the cross-sectional structure of the battery pack according to an embodiment of the present invention, viewed from a fourth viewing angle, and is intended to illustrate the structure related to the second opening;

[0039] Figure 13 for Figure 12 Enlarged view of point E in the middle;

[0040] Figure 14 This is a schematic diagram of the cross-sectional structure of the battery pack according to one embodiment of the present invention, viewed from a fifth viewing angle, and is intended to illustrate the related structures of the liquid cooling channel, the first air flow channel, and the second air flow channel;

[0041] Figure 15 for Figure 14 Enlarged view of point F in the middle;

[0042] Figure 16 This is a schematic diagram of the cross-sectional structure of the battery pack in one embodiment of the present invention observed along a sixth viewing angle, intended to illustrate the relevant structure of the third air flow channel;

[0043] Figure 17 for Figure 16 Enlarged view of point G in the middle;

[0044] Figure 18 This is a schematic diagram of the cross-sectional structure of the battery pack according to one embodiment of the present invention, viewed from a seventh viewing angle, and is intended to illustrate the structure related to the third opening;

[0045] Figure 19 for Figure 18 Enlarged view of H in the middle;

[0046] Figure 20The liquid flow direction of the liquid cooling structure in one embodiment of the present invention;

[0047] Figure 21 This is the gas flow direction of the air cooling structure in one embodiment of the present invention.

[0048] Description of Figure Numbers:

[0049] Housing 100; second air flow channel 110; first opening 111; third air flow channel 120;

[0050] Liquid cooling plate 200; motherboard 210; daughterboard 220; liquid cooling channel 230; first air flow channel 240; air inlet 241; air outlet 242; second opening 243; third opening 244;

[0051] Battery cell 300; first explosion-proof valve 310;

[0052] Liquid conduit 400; liquid inlet end 410; liquid outlet end 420; first segment 421; second segment 422;

[0053] Air guide pipe 500; air outlet 510;

[0054] Second explosion-proof valve 600;

[0055] First direction X; second direction Y.

[0056] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0057] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0058] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications 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 indications will also change accordingly.

[0059] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of such features. In addition, if "and / or", "and / or" or "and / or" appear in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually 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.

[0060] In related technologies, when lithium batteries are operating, their complex internal chemical reactions generate a large amount of heat. If this heat cannot be effectively and promptly dissipated from the battery pack, the battery temperature will rise rapidly. This will not only accelerate battery aging and shorten its service life, but may also lead to serious safety issues such as thermal runaway. Furthermore, temperature differences within the battery pack can cause uneven internal resistance and capacity between cells, further reducing the overall battery performance.

[0061] Reference below Figures 1 to 21 To describe the battery pack according to the embodiment of the present invention. Figures 1 to 4 In some embodiments, the battery pack of the present invention includes a housing 100, a battery cell assembly, and a liquid cooling plate 200. The battery cell assembly and the liquid cooling plate 200 are both arranged in the housing 100, and the liquid cooling plate 200 is provided with a liquid cooling channel 230 and a first air flow channel 240 that are isolated from each other. The first air flow channel 240 has an air inlet 241 and an air outlet 242. The air inlet 241 is used to obtain the gas generated after the battery cell assembly has thermal runaway, and the air outlet 242 is used to discharge the gas in the first air flow channel 240 out of the housing 100. The liquid cooling channel 230 and the first air flow channel 240 are provided on the liquid cooling plate 200 at the same time. When the cooling liquid flows in the liquid cooling channel 230, it can not only directly cool the battery cell assembly, but also improve the safety of the battery pack by cooling the gas in the first air flow channel 240 when the battery cell assembly has thermal runaway.

[0062] In some embodiments, the shell 100 is square, the width direction of the shell 100 is configured as the first direction X, the length direction of the shell 100 is configured as the second direction Y, and the height direction of the shell is configured as the vertical direction. The first direction X, the second direction Y and the vertical direction are perpendicular to each other.

[0063] It is understood that in some embodiments, the liquid cooling plate 200 is hollow and includes a partition extending along the first direction X. The partition divides the liquid cooling plate 200 into an upper cavity and a lower cavity along the vertical direction, wherein the upper cavity is configured as the liquid cooling channel 230, and the lower cavity is configured as the first airflow channel 240. Of course, it is understood that the liquid cooling channel 230 and the first airflow channel 240 can also be provided separately and then connected to the side of the liquid cooling plate 200 facing the battery cells 300. It is only necessary that the liquid cooling channel 230 and the first airflow channel 240 are both provided on the same liquid cooling plate 200.

[0064] Reference Figure 2 and Figure 3 In some embodiments, the liquid cooling plate 200 includes a daughterboard 220 and a motherboard 210. The motherboard 210 is located on one side of the battery pack, and the daughterboards 220 are spaced apart within the housing 100 along the second direction Y, with the surfaces of both the daughterboards 220 and the motherboard 210 parallel to the first direction X. The battery pack includes a liquid conduit 400, through which the daughterboards 220 are connected to the motherboard 210. After the cooling liquid is injected into the liquid conduit 400, it enters the liquid cooling channels 230 of the motherboard 210 and the daughterboard 220 through the liquid conduit 400, enabling the liquid cooling plate 200 to cool the battery cell components. The liquid-cooling channel 230 and the first airflow channel 240 both extend along the first direction X. Vertically, the liquid-cooling channel 230 is located above the first airflow channel 240. The liquid-cooling channel 230 and the first airflow channel 240 are spaced apart and adjacent to each other, meaning that portions of the channel wall of the liquid-cooling channel 230 and portions of the channel wall of the first airflow channel 240 are the same wall. The channel wall shared by the liquid-cooling channel 230 and the first airflow channel 240 is relatively thin, allowing the cooling liquid in the liquid-cooling channel 230 to have a more significant effect on the gas in the first airflow channel 240. Since the liquid-cooling channel 230 is located above the first airflow channel 240, even if the cooling liquid does not completely fill the liquid-cooling channel 230, the cooling liquid can still cover the wall below the liquid-cooling channel 230, i.e., the channel wall shared by the liquid-cooling channel 230 and the first airflow channel 240. This arrangement facilitates the cooling liquid in the liquid-cooling channel 230 to continuously cool the gas in the first airflow channel 240.

[0065] Reference Figures 2 to 4In some embodiments, a battery cell assembly includes a battery cell 300, and a liquid cooling plate 200 includes multiple sub-plates 220. The sub-plates 220 are arranged along a second direction Y. The battery cell 300 is located between the sub-plates 220 or between the sub-plates 220 and the motherboard 210. Both surfaces of the battery cell 300 that are arranged opposite each other along the second direction Y are in contact with the liquid cooling plate 200. This arrangement can reduce the volume of the battery pack and increase the energy density, while also ensuring that both surfaces of the battery cell 300 that are arranged opposite each other along the second direction Y are cooled by the liquid cooling plate 200.

[0066] Of course, it is understandable that only one battery cell 300 may be arranged between adjacent liquid cooling plates 200 , or a plurality of battery cells 300 may be arranged side by side along the first direction X.

[0067] Of course, it is understandable that in some embodiments, the liquid cooling plate 200 does not have a motherboard 210 and a liquid guide pipe 400, and the cooling liquid flows directly from the outside of the shell 100 along the first direction X into the liquid cooling channel 230 of each daughter board 220, and the liquid cooling channels 230 of each daughter board 220 are not connected to each other.

[0068] It will be appreciated that in some embodiments, the motherboard 210 is located on one side of each daughterboard 220. In some embodiments, the motherboard 210 is located between each daughterboard 220. The liquid conduit 400 extends along the second direction Y. Cooling liquid enters the liquid conduit 400 from the liquid inlet end 410 of the liquid conduit 400. The cooling liquid continues to flow in the second direction Y, and along the way, flows in the opposite direction of the first direction X to fill the liquid cooling channels 230 of each daughterboard 220. The cooling liquid in the liquid cooling channels 230 of each daughterboard 220 then flows out from the other side of the liquid cooling channels 230, converges on the other side of the liquid conduit 400, and then flows out from the liquid outlet end 420. The liquid outlet end 420 can be directly connected to the outside of the housing 100, or indirectly connected to the outside of the housing 100. The motherboard 210 is provided to facilitate the collection, distribution, and regulation of the direction of the cooling liquid or gas.

[0069] Regarding the liquid outlet 420 indirectly connected to the outside of the housing 100, refer to Figures 5 to 9In some embodiments, the liquid conduit 400 includes a liquid inlet 410 and a liquid outlet 420. Cooling liquid enters the liquid conduit 400 from the liquid inlet 410, diffuses into the liquid cooling channel 230, exchanges heat with the battery cells 300, and then flows out from the liquid outlet 420. This configuration enables circulation of the cooling liquid within the liquid cooling channel 230, allowing new cooling liquid to continuously flow into the liquid cooling channel 230, thereby improving heat exchange efficiency. Specifically, the liquid inlet 410 passes through the motherboard 210 and directly connects to the daughterboard 220. The cooling liquid flows directly from the liquid inlet 410 of the liquid conduit 400 into the liquid cooling channel 230 of the daughterboard 220. The liquid outlet 420 includes a first segment 421 and a second segment 422. The liquid outlet of the first segment 421 is located in the liquid cooling channel 230 of the motherboard 210. Cooling liquid flows from the liquid cooling channel 230 of the daughterboard 220 through the liquid outlet of the first segment 421 into the liquid cooling channel 230 of the motherboard 210. The liquid inlet of the second segment 422 is located in the liquid cooling channel 230 of the motherboard 210. After the cooling liquid fills the liquid cooling channel 230 of the motherboard 210, it flows into the second segment 422 through the liquid inlet of the second segment 422 and is then discharged from the housing 100 through the second segment 422. In other words, the liquid outlet of the first segment 421 is located within the liquid cooling channel 230 of the motherboard 210, while the liquid inlet of the second segment 422 is located within the liquid cooling channel 230 of the motherboard 210. The other side of the second segment 422 communicates with the exterior of the housing 100. At this point, cooling liquid from the liquid-conducting conduit 400 enters the liquid-cooling channel 230 of the motherboard 210 through the liquid outlet of the first segment 421. The cooling liquid continues to flow from the liquid outlet of the first segment 421 into the liquid-cooling channel 230 of the motherboard 210. After the cooling liquid has completely filled the liquid-cooling channel 230 of the motherboard 210, the cooling liquid is forced out of the housing 100 through the liquid inlet of the second segment 422 under pressure. This arrangement is simple in structure, easy to install, and facilitates subsequent maintenance, while allowing the motherboard 210 to fully participate in heat exchange with the battery cells 300.

[0070] Reference Figure 4 、 Figure 10 and Figure 11In some embodiments, the housing 100 includes a mounting location for mounting the battery cell 300. The battery cell 300 includes an explosion-proof valve, and the mounting location of the housing 100 includes a first opening 111. The explosion-proof valve covers the first opening 111, that is, the explosion-proof valve is seated in the first opening 111. The housing 100 includes a second airflow channel 110, which is provided on the bottom plate of the housing 100 that supports the battery cell 300. The first opening 111 connects to the second airflow channel 110, which in turn connects to the first airflow channel 240. The first opening 111 is configured as an air inlet 241. Specifically, the hot gas generated by the battery cell 300 enters the second airflow channel 110 from the first opening 111, and then enters the first airflow channel 240 from the second airflow channel 110, exchanging heat with the gas in the first airflow channel 240. With this arrangement, the gas within the first airflow channel 240 can exchange heat with the gas within the second airflow channel 110, thereby exchanging heat with the battery cell 300 at the first opening 111. This arrangement can increase the area of the battery cell 300 available for heat exchange. The gas within the first airflow channel 240 is maintained at a low temperature by the cooling liquid within the liquid cooling channel 230. The gas within the first airflow channel 240 and the gas within the second airflow channel 110 exchange heat, so that the gas in the entire airflow channel of the battery pack has a lower temperature. Because the battery cell 300 is directly seated at the first opening 111, the gas in the second airflow channel 110 can directly exchange heat with the battery cell 300 at the first opening 111, without the need for heat conduction through the plate surface of the liquid cooling plate 200.

[0071] Of course, it is understandable that, in some embodiments, the battery pack is provided with a sealing ring at the first opening 111 to ensure that the explosion-proof valve of the battery cell 300 is sealedly connected to the second air flow channel 110 , thereby ensuring the sealing of the second air flow channel 110 .

[0072] Reference Figure 12 and Figure 13 In some embodiments, a sealing ring is provided to improve the sealing of the battery pack air flow channel. Specifically, a sealing ring is provided at the second opening 243 , and the sealing ring is used to seal the first air flow channel 240 and the second air flow channel 110 . The gas in the second air flow channel 110 enters the first air flow channel 240 through the sealing ring.

[0073] Reference Figure 14 and Figure 15In some embodiments, the second air flow channel 110 extends along the second direction Y and penetrates each liquid cooling plate 200 along the second direction Y. The liquid cooling plate 200 includes a second opening 243. In some embodiments, the template 210 includes the second opening 243. In some embodiments, the sub-plate 220 includes the second opening 243. The second opening 243 connects the first air flow channel 240 and the second air flow channel 110, so that gas in the second air flow channel 110 can exchange with gas in the first air flow channel 240.

[0074] Reference Figure 8 In some embodiments, the battery pack's liquid conduit 400 is curved near the motherboard 210. This design allows the liquid conduit 400 to better adapt to the shape of the motherboard 210 when connected, and reduces stress concentration caused by sudden angle changes at the connection, thereby improving the durability and sealing of the connection. The curved design of the liquid conduit 400 helps reduce resistance loss during coolant flow, ensuring smooth coolant flow into the liquid cooling channel 230, thereby improving cooling efficiency.

[0075] It is understandable that in some embodiments, the position of the liquid-conducting conduit 400 close to the motherboard 210 adopts an arc-shaped design. This arc-shaped design can optimize the connection between the liquid-conducting conduit 400 and the motherboard 210 by adjusting the size of the arc, further improving the connection strength and stability. In addition, by selecting a suitable arc, the liquid-conducting conduit 400 can be made more compact in spatial layout, which is conducive to saving space inside the battery pack. The arc-shaped design also helps to improve the flow state of the coolant and reduce the occurrence of turbulence, thereby reducing flow noise and enhancing the quiet performance of the entire system. In this way, the overall structure of the battery pack is more reasonable, which improves its reliability and user satisfaction in actual use.

[0076] Reference Figure 16 and Figure 17In some embodiments, the housing 100 includes a third airflow channel 120, which surrounds the peripheral wall of the housing 100 and is disposed within the peripheral wall. The liquid cooling plate 200 includes a third opening 244, which connects the first airflow channel 240 and the third airflow channel 120. Specifically, the third opening 244 is disposed on the surface wall of the motherboard 210, which is arranged opposite each other along the first direction X. The housing 100 has a circumferentially surrounding hollow cavity, which is configured as the third airflow channel 120. The third opening 244 connects to the hollow cavity of the housing 100, so that the first airflow channel 240 connects to the third airflow channel 120 through the third opening 244. The battery pack includes a second explosion-proof valve 600, and the housing 100 includes a mounting hole. The second explosion-proof valve 600 is mounted in the mounting hole, which connects to the third airflow channel 120 and is configured as the air outlet 242. Gas generated by thermal runaway of the battery cell assembly flows from first opening 111 into second airflow channel 110, then from second airflow channel 110 through second opening 243 into first airflow channel 240 of motherboard 210, and finally into third airflow channel 120 through third opening 244. If excessive gas is generated by thermal runaway of the battery cell assembly, the gas in third airflow channel 120 will open second explosion-proof valve 600, thereby improving the safety of the battery pack.

[0077] Reference Figure 18 、 Figure 19 and Figure 9 In some embodiments, the battery pack includes an air duct 500 that connects the daughter board 220 and the mother board 210. Specifically, the air duct 500 connects the first airflow channel 240 of the daughter board 220 and the first airflow channel 240 of the mother board 210. The air duct 500 includes an air outlet 510 located in the first airflow channel 240 of the mother board 210. A portion of the gas generated after thermal runaway of the battery cell assembly enters the second airflow channel 110 through the first opening 111 and then enters the first airflow channel 240 of the daughter board 220 through the second opening 243. The gas in the first airflow channel 240 of the daughter board 220 passes through the air duct 500 and enters the first airflow channel 240 of the mother board 210. Another portion of the gas generated after thermal runaway of the battery cell assembly enters the second airflow channel 110 through the first opening 111 and then enters the first airflow channel 240 of the mother board 210 through the second opening 243 of the mother board 210. The third opening 244 connects the first airflow channel 240 of the motherboard 210 with the third airflow channel 120 of the housing 100, allowing gas within the first airflow channel 240 of the motherboard 210 to enter the third airflow channel 120 through the third opening 244. If excessive gas is generated after thermal runaway of the battery cell assembly, the gas within the third airflow channel 120 will open the second explosion-proof valve 600, thereby improving the safety of the battery pack.

[0078] Reference Figure 12 and Figure 19 In some embodiments, both ends of the gas duct 500 are configured as gas outlets 510. The two gas outlets 510 are arranged opposite each other along the first direction X within the first airflow channel 240 of the motherboard 210. This arrangement improves gas flow efficiency. On the one hand, it allows the gas in the first airflow channel 240 to quickly flow to other locations after being affected by the cooling liquid. On the other hand, if excessive gas is generated after thermal runaway of the battery cell assembly, the gas can quickly flow to the mounting hole of the third airflow channel 120, opening the second explosion-proof valve 600 and reducing the risk.

[0079] The flow direction of liquid or gas in the liquid cooling structure and air cooling structure of the battery pack of the present invention is systematically described below.

[0080] Regarding the flow direction of liquid in the liquid cooling structure, refer to Figure 8 and Figure 20 Specifically, after the cooling liquid flows into the liquid conduit 400 from the liquid inlet end 410, it splits into two branches. The first branch is where the cooling liquid flows within the liquid conduit 400 along the second direction Y. The second branch is where the cooling liquid within the liquid conduit 400 flows in the opposite direction of the first direction X, filling the liquid cooling channels 230 of the daughter board 220. At this point, the cooling liquid is distributed throughout the liquid cooling channels 230 of each daughter board 220. As the cooling liquid continues to flow in, the cooling liquid within the liquid cooling channels 230 of each daughter board 220 flows out from the other side and converges into the liquid conduit 400 on the other side. The liquid conduit 400 on this side includes a liquid outlet 420, which comprises a first segment 421 and a second segment 422. The first segment 421 and the second segment 422 are located on opposite sides of the motherboard 210. The liquid outlet of the first segment 421 is connected to the liquid cooling channel 230 of the motherboard 210, while the liquid inlet of the second segment 422 is connected to the liquid cooling channel 230 of the motherboard 210. The other end of the second segment 422 is connected to the outside of the housing 100. Cooling liquid continuously flows from the liquid outlet 420 into the liquid cooling channel 230 of the motherboard 210. After filling the liquid cooling channel 230 of the motherboard 210 along the first direction X, it is squeezed out of the liquid inlet of the second segment 422 and flows out of the housing 100. This cycle forms the liquid cooling structure of the battery pack of the present invention.

[0081] Regarding the flow direction of gas in the air-cooled structure, refer to Figure 21Specifically, after the gas generated by thermal runaway of the battery cell assembly enters the second airflow channel 110 through the first opening 111, the airflow is divided into two branches. In the first branch, the gas flows along the second airflow channel 110 to the second opening 243 of the motherboard 210, and then flows into the first airflow channel 240 of the motherboard 210 through the second opening 243 of the motherboard 210. In the second branch, the gas flows along the second airflow channel 110 to the second opening 243 of the daughterboard 220, and then flows into the first airflow channel 240 of the daughterboard 220 from the second opening 243 of the daughterboard 220. The gas in the first airflow channel 240 of the daughterboard 220 enters the air duct 500 from both ends of the daughterboard 220 along the first direction X. The outlet end 510 of the air duct 500 is located in the first airflow channel 240 of the motherboard 210, and the gas in the air duct 500 enters the first airflow channel 240 of the motherboard 210 from the outlet end 510. Both the daughter board 220 and the mother board 210 include a liquid cooling channel 230. The liquid cooling channel 230 is adjacent to the first air flow channel 240. The channel wall of the liquid cooling channel 230 facing the first air flow channel 240 and the channel wall of the first air flow channel 240 facing the liquid cooling channel 230 are the same wall body. Therefore, the cooling liquid passes through the channel wall at this location and affects the gas temperature in the first air flow channel 240. Therefore, the battery pack of the present invention can improve the safety of the battery pack by cooling the gas in the first air flow channel 240 when thermal runaway occurs in the battery cell assembly.

[0082] In addition, the gas generated by thermal runaway of the battery cell assembly flows into the first air flow channel 240 of the motherboard 210 through two branches. The first air flow channel 240 of the motherboard 210 is connected to the third air flow channel 120 of the shell 100 through the third opening 244. The channel wall of the third air flow channel 120 of the shell 100 is provided with a mounting hole for installing the second explosion-proof valve 600. When the gas generated by thermal runaway of the battery cell assembly is excessive, the gas in the third air flow channel 120 will rush open the explosion-proof valve to prevent the battery pack from exploding. Therefore, the safety of the battery pack of the present invention is guaranteed.

[0083] The above are only preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include case; A battery core assembly is disposed in the housing; a liquid cooling plate, arranged in the shell, the liquid cooling plate being attached to the battery cell assembly or the liquid cooling plate and the battery cell assembly being spaced apart to cool the battery cell assembly, the liquid cooling channel and the first air flow channel being isolated from each other being provided in the liquid cooling plate, the first air flow channel having an air inlet and an air outlet, the air inlet being used to obtain gas generated after thermal runaway of the battery cell assembly, and the air outlet being used to discharge the gas in the first air flow channel out of the shell; the liquid cooling plate further comprising a motherboard and a daughterboard, the motherboard and the daughterboard being both provided with the liquid cooling channel and the first air flow channel, the battery pack comprising a liquid guide pipe, the liquid cooling channel of the daughterboard being connected to the liquid cooling channel of the motherboard through the liquid guide pipe, and the cooling liquid entering the liquid cooling channels of the daughterboard and the motherboard through the liquid guide pipe; The liquid guide pipe includes a liquid inlet and a liquid outlet, the liquid inlet is connected to the daughter board, and the liquid outlet includes a first segment and a second segment, the first segment and the second segment are respectively located on opposite sides of the motherboard, the liquid outlet of the first segment is connected to the liquid cooling channel of the motherboard, and the liquid inlet of the second segment is connected to the liquid cooling channel of the motherboard. After the cooling liquid flows into the liquid cooling channel of the motherboard from the liquid outlet of the first segment, it is discharged from the housing through the liquid inlet of the second segment.

2. The battery pack according to claim 1, wherein: In the vertical direction, the liquid cooling channel is located above the first air flow channel. The housing has a first direction. Both the liquid cooling channel and the first air flow channel extend along the first direction, and the first direction intersects the vertical direction.

3. The battery pack according to claim 2, wherein: The liquid cooling plate includes a plurality of sub-boards, the battery cell assembly includes battery cells, the plurality of sub-boards are arranged at intervals along the second direction, the battery cells are located between the plurality of sub-boards and / or the battery cells are located between the sub-boards and the motherboard, and the battery cells are suitable for bonding.

4. The battery pack according to claim 3, wherein: The battery cell includes a first explosion-proof valve, the housing includes a mounting position, the mounting position includes a first opening, the battery cell is mounted at the mounting position, and the first explosion-proof valve covers the first opening; In which, the shell includes a second air flow channel, the second air flow channel is arranged on the bottom plate of the shell supporting the battery cell, the first opening is connected to the second air flow channel, the second air flow channel is connected to the first air flow channel, and the first opening is configured as the air inlet.

5. The battery pack according to claim 4, characterized in that: The second air flow channel extends along the second direction, the motherboard includes a second opening, and the second opening connects the first air flow channel and the second air flow channel; and / or, The sub-plate includes the second opening, and the second opening connects the first air flow channel and the second air flow channel.

6. The battery pack according to claim 5, characterized in that: Along the second direction, the first segment is arc-shaped at a position close to the motherboard.

7. The battery pack according to claim 2, characterized in that: The housing includes a third air flow channel, the liquid cooling plate includes a third opening, and the third opening is connected to the first air flow channel and the third air flow channel; The battery pack includes a second explosion-proof valve, the shell includes a mounting hole, the second explosion-proof valve is mounted on the mounting hole, the mounting hole is connected to the third air flow channel, and the mounting hole is configured as the air outlet.

8. The battery pack according to claim 7, characterized in that: The battery pack includes an air duct, which connects the daughter board and the mother board. The air duct includes an air outlet end, which is located in the first air flow channel of the mother board. The third opening connects the first air flow channel and the third air flow channel of the mother board.

9. The battery pack according to claim 8, characterized in that: The third air flow channel surrounds the peripheral wall plate of the housing, and the third air flow channel is arranged in the peripheral wall plate.

10. The battery pack according to claim 8, characterized in that: The two ports of the air guide duct are arranged opposite to each other in the first air flow channel of the motherboard along a first direction, and the two ports of the air guide duct are both configured as air outlet ends.

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