Cooling device of multi-layer battery pack, multi-layer battery pack and vehicle thereof

Abstract

The invention discloses a cooling device of a multi-layer battery pack, the multi-layer battery pack and a vehicle with the multi-layer battery pack. The cooling device comprises a cooling assembly and an exhaust channel. The cooling assembly is provided with a cooling flow channel, a liquid inlet and a liquid outlet are formed in one side of the cooling assembly in the second direction, and the cooling assembly is suitable for being arranged between two adjacent cell layers in the third direction. The exhaust channel comprises a first exhaust channel and a second exhaust channel, a first air inlet of the first exhaust channel is suitable for being opposite to the anti-explosion valve of one of the two adjacent battery cell layers, and a second air inlet of the second exhaust channel is suitable for being opposite to the anti-explosion valve of the other of the two adjacent battery cell layers. According to the cooling device disclosed by the invention, the design of the exhaust channel of the cooling device is simplified, the risk of high-temperature gas channeling in a cavity can be reduced during thermal runaway, and the thermal runaway risk of two adjacent battery cell layers is reduced. In addition, the cooling flow channels can be used for cooling the two adjacent battery cell layers and the cavities of the two adjacent battery cell layers, so that the use safety of the battery pack is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery packs, and in particular to a cooling device for a multi-layer battery pack, a multi-layer battery pack, and a vehicle thereof. Background Art

[0002] In the prior art, double-layer power battery packs often use tray side beams for exhaust to reduce the risk of thermal runaway. However, the above-mentioned double-layer power battery packs have the problem of complex exhaust circuits. In addition, since the upper and lower battery cell layers share a common explosion-proof valve, it is easy for high-temperature gases in the upper and / or lower battery cell layers to cross-cavity, thereby reducing the safety of the double-layer power battery. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a cooling device for a multi-layer battery pack that prevents high-temperature gas from leaking into the cavity during thermal runaway of at least one of the adjacent battery cell layers, thereby reducing the risk of thermal runaway between the two adjacent battery cell layers and improving the safety of the battery pack.

[0004] Another object of the present invention is to provide a multi-layer battery pack.

[0005] Another object of the present invention is to provide a vehicle.

[0006] According to an embodiment of the first aspect of the present invention, a cooling device for a multi-layer battery pack includes: a cooling component, the cooling component having a cooling channel, the cooling channel being arranged along a first direction, and the cooling component having a liquid inlet and a liquid outlet formed on one side in a second direction, the liquid inlet and the liquid outlet being respectively connected to the cooling channel, and the cooling component being suitable for being arranged between two adjacent battery core layers in a third direction, and the first direction, the second direction and the third direction being orthogonal to each other.

[0007] An exhaust channel, wherein the exhaust channel includes a first exhaust channel and a second exhaust channel, wherein the first air inlet of the first exhaust channel is suitable for being opposite to the explosion-proof valve of one of the two adjacent battery core layers, and the second air inlet of the second exhaust channel is suitable for being opposite to the explosion-proof valve of the other of the two adjacent battery core layers.

[0008] According to the cooling device of the multi-layer battery pack of the first embodiment of the present invention, the first air inlet of the first exhaust channel is suitable for being opposite to the explosion-proof valve of one of the two adjacent battery core layers, and the second air inlet of the second exhaust channel is suitable for being opposite to the explosion-proof valve of the other of the two adjacent battery core layers. As a result, the design of the exhaust channel of the cooling device is simplified, and the high-temperature gas channeling into the cavity during thermal runaway of at least one of the adjacent battery core layers is avoided, the risk of thermal runaway of the two adjacent battery core layers is reduced, and the safety of the battery pack is improved. In addition, the cooling channel provided between the two adjacent battery core layers can cool the two adjacent battery core layers and their cavities, further improving the safety of the battery pack.

[0009] According to some embodiments of the present invention, the first exhaust channel and the second exhaust channel are respectively provided on both sides of the cooling assembly in the third direction.

[0010] According to some embodiments of the present invention, the cooling assembly includes a first cooling plate and a second cooling plate stacked along the third direction, the first cooling plate and the second cooling plate jointly define the cooling channel, and the cooling channel is wavy in shape.

[0011] According to some embodiments of the present invention, part of the first cooling plate protrudes away from the second cooling plate to form a first protrusion, and part of the second cooling plate protrudes away from the first cooling plate to form a second protrusion. In the third direction, the second protrusion and the first protrusion are opposite to each other to define the cooling channel.

[0012] According to some embodiments of the present invention, in the third direction, the first exhaust channel or the second exhaust channel is located on a side of the battery core layer adjacent to the cooling assembly.

[0013] According to some embodiments of the present invention, the cooling assembly further includes a third exhaust plate, which is arranged on a side of the first cooling plate away from the second cooling plate, and at least one first air inlet is formed on the third exhaust plate, and the first air inlet extends along the first direction; wherein, a portion of the second cooling plate protrudes in a direction away from the first cooling plate to form a third protrusion, and the third protrusion and the third exhaust plate together define the first exhaust channel.

[0014] According to some embodiments of the present invention, the first exhaust port, the liquid inlet and the liquid outlet of the first exhaust channel are located on the same side of the cooling device in the second direction; the third protrusion includes a first protrusion segment and a second protrusion segment connected to each other, the first protrusion segment extends along the second direction, and the second protrusion segment extends along the first direction and is connected to the first exhaust port.

[0015] According to some embodiments of the present invention, the cooling device of the multi-layer battery pack further includes: at least one first exhaust assembly, the first exhaust assembly including a first exhaust plate and a second exhaust plate stacked along the third direction, the first exhaust plate and the second exhaust plate jointly defining the second exhaust channel, and the second exhaust channel is located on the side of the battery core layer away from the cooling assembly in the third direction.

[0016] According to some embodiments of the present invention, a plurality of through holes are formed on the first exhaust plate, the plurality of through holes are communicated with the second exhaust channel, the plurality of through holes are spaced apart along the first direction, and each of the through holes extends along the second direction.

[0017] According to some embodiments of the present invention, the cooling assembly further comprises a fourth exhaust plate, the fourth exhaust plate being disposed on a side of the second cooling plate away from the first cooling plate, the fourth exhaust plate being formed with at least one second air inlet, and the second air inlet extending along the second direction; Part of the second cooling plate is recessed toward the first cooling plate to form a recessed portion, and the recessed portion and the fourth exhaust plate together define the second exhaust channel.

[0018] According to some embodiments of the present invention, the second exhaust port, the liquid inlet and the liquid outlet of the second exhaust channel are located on one side of the cooling device in the second direction; the recessed portion includes a first recessed section and a second recessed section connected to each other, the first recessed section extends along the second direction, and the second recessed section extends along the first direction and is connected to the second exhaust port.

[0019] According to some embodiments of the present invention, the cooling device of the multi-layer battery pack further includes: a plurality of second exhaust assemblies, each of the second exhaust assemblies being arranged on a side of the battery core layer away from the cooling assembly in the third direction, the second exhaust assemblies including a fifth exhaust plate and a sixth exhaust plate stacked along the third direction, and the plurality of second exhaust assemblies respectively defining the first exhaust channel and the second exhaust channel.

[0020] According to some embodiments of the present invention, the first exhaust channel and the second exhaust channel are both formed with a plurality of sub-air inlets on one side of the third direction, the plurality of sub-air inlets are spaced apart along the first direction, and the plurality of sub-air inlets are opposite to the explosion-proof valve of the battery core layer.

[0021] According to an embodiment of the second aspect of the present invention, a multi-layer battery pack comprises: a plurality of battery core layers, wherein the plurality of battery core layers are arranged along the third direction; and at least one cooling device, wherein at least part of the cooling device is arranged between two adjacent battery core layers, and the cooling device is the cooling device of the multi-layer battery pack according to the embodiment of the first aspect of the present invention.

[0022] According to some embodiments of the present invention, each of the battery cell layers includes a plurality of battery cells, the plurality of battery cells are arranged along the second direction, and each of the battery cells extends along the first direction; wherein, each of the battery cells includes a battery cell body, a pole and an explosion-proof valve, the pole is arranged on one side of the battery cell body in the first direction, and the explosion-proof valve is arranged on the side of the battery cell body adjacent to the exhaust channel in the third direction.

[0023] According to some embodiments of the present invention, the explosion-proof valves of the battery cells are opposite to the first air inlet of the first exhaust channel or the second air inlet of the second exhaust channel.

[0024] According to some embodiments of the present invention, each of the battery cell layers includes multiple battery cell groups, the multiple battery cell groups are spaced apart along the first direction, and the multiple battery cells in each of the battery cell groups are arranged along the second direction; wherein, each of the battery cells includes a battery cell body, a pole and an explosion-proof valve, the pole is arranged on one side of the battery cell body in the third direction, and the explosion-proof valve is arranged on one side of the battery cell body adjacent to the exhaust channel in the third direction.

[0025] According to some embodiments of the present invention, the explosion-proof valves of two adjacent battery cells along the third direction are opposite to each other, and a cooling assembly, a first exhaust channel and a second exhaust channel are provided between two adjacent battery cell layers, and the first exhaust channel and the second exhaust channel are respectively provided on both sides of the cooling assembly in the third direction.

[0026] According to some embodiments of the present invention, the explosion-proof valves of two adjacent battery cells along the third direction face the same side, a cooling assembly and a first exhaust channel are provided between the two adjacent battery cell layers, and the two adjacent battery cell layers are respectively the first battery cell layer and the second battery cell layer, the first exhaust channel is located between the cooling assembly and the explosion-proof valve of the first battery cell layer, and the second exhaust channel is provided adjacent to the explosion-proof valve of the second battery cell layer.

[0027] According to some embodiments of the present invention, the explosion-proof valves of two adjacent battery cells along the third direction deviate from each other, a cooling assembly is provided between the two adjacent battery cell layers, the two adjacent battery cell layers are respectively a first battery cell layer and a second battery cell layer, the first row of channels is adjacent to the explosion-proof valve of the first battery cell layer, and the second exhaust channel is located at the explosion-proof valve of the second battery cell layer.

[0028] A vehicle according to an embodiment of a third aspect of the present invention includes a multi-layer battery pack according to an embodiment of the second aspect of the present invention.

[0029] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which: Figure 1 is a schematic diagram of a cooling assembly of a cooling device according to an embodiment of the present invention; Figure 2 is a partial exploded view of a cooling assembly of a cooling device according to an embodiment of the present invention; Figure 3 is an exploded view of a cooling assembly of a cooling device according to an embodiment of the present invention; Figure 4 is a schematic diagram of a multi-layer battery pack according to a first embodiment of the present invention; Figure 5 is a partial cross-sectional view of a multi-layer battery pack according to a first embodiment of the present invention; Figure 6 yes Figure 5 The enlarged view of section A shown in the middle circle; Figure 7 yes Figure 5 Exploded view of a multi-layer battery pack shown in ; Figure 8 is a schematic diagram of a multi-layer battery pack according to a second embodiment of the present invention; Figure 9 is a partial cross-sectional view of a multi-layer battery pack according to a second embodiment of the present invention; Figure 10 yes Figure 9 The enlarged view of the part B shown in the middle circle; Figure 11 is a schematic diagram of a second cooling plate of a cooling assembly of a cooling device according to an embodiment of the present invention; Figure 12 2. It is a schematic diagram of the coordination between the first exhaust and the battery core layer of the cooling device according to an embodiment of the present invention; Figure 13 is a partial cross-sectional view of a multi-layer battery pack according to a third embodiment of the present invention; Figure 14 yes Figure 13 The enlarged view of the C part circled in the middle; Figure 15 is a schematic diagram of a second cooling plate of a cooling device according to a third embodiment of the present invention; Figure 16 is a schematic diagram of a multi-layer battery pack according to a fourth embodiment of the present invention; Figure 17 is a partial cross-sectional view of a multi-layer battery pack according to a fourth embodiment of the present invention; Figure 18 yes Figure 17 Enlarged view of the circled section D.

[0031] Reference numerals: 100: cooling device; 1: Cooling assembly; 11: Cooling channel; 12: Liquid inlet; 13: Liquid outlet; 14: First cooling plate; 141: First protrusion; 15: Second cooling plate; 151: Second protrusion; 152: Third protrusion; 1521: First protrusion section; 1522: Second protrusion section; 153: Recess; 1531: First recessed section; 1532: Second recessed section; 16: Third exhaust plate; 161: First air inlet; 17: Fourth exhaust plate; 171: Second air inlet; 2: Exhaust channel; 21: First exhaust channel; 211: First exhaust port; 22: Second exhaust channel; 221: Second exhaust port; 222: Sub-air inlet; 3: First exhaust assembly; 31: First exhaust plate; 311: Through hole; 32: Second exhaust plate; 4: Second exhaust assembly; 41: Fifth exhaust plate; 42: Sixth exhaust plate; 200: multi-layer battery pack; 201: battery layer; 202: battery cell; 2021: battery cell body; 2022: pole; 2023: explosion-proof valve; 203: battery cell group. DETAILED DESCRIPTION

[0032] Reference below Figures 1-18 A cooling device 100 for a multi-layer battery pack 200 according to an embodiment of a first aspect of the present invention will be described.

[0033] like Figures 1-18 As shown, the cooling device 100 of the multi-layer battery pack 200 according to the first embodiment of the present invention includes a cooling assembly 1 and an exhaust channel 2.

[0034] Specifically, the cooling assembly 1 has a cooling channel 11, and the cooling channel 11 is along a first direction (for example, Figure 1 ), and the cooling assembly 1 is arranged in a second direction (for example, Figure 1 A liquid inlet 12 and a liquid outlet 13 are formed on one side of the cooling channel 11, and the liquid inlet 12 and the liquid outlet 13 are respectively connected to the cooling channel 11. Figure 1The cooling assembly 1 is preferably located between two adjacent battery cell layers 201 (in the vertical direction). The first, second, and third directions are orthogonal to each other. The exhaust channel 2 includes a first exhaust channel 21 and a second exhaust channel 22. The first air inlet 161 of the first exhaust channel 21 is adapted to face the explosion-proof valve 2023 of one of the two adjacent battery cell layers 201, while the second air inlet 171 of the second exhaust channel 22 is adapted to face the explosion-proof valve 2023 of the other of the two adjacent battery cell layers 201.

[0035] For example, in Figure 1-Figure 3 In the example shown, cooling channel 11 on cooling assembly 1 is connected to liquid inlet 12 and liquid outlet 13 along a first direction, thereby forming a coolant circulation loop. Coolant enters through liquid inlet 12, flows along cooling channel 11, and exits through liquid outlet 13. While flowing through cooling channel 11, the coolant exchanges heat, cooling the battery core layer 201 adjacent to cooling channel 11 and the air within the cavity corresponding to the battery core layer 201.

[0036] The arrangement of cooling channels 11 along a first direction helps increase the area of cooling channels 11 in cooling assembly 1, thereby improving the cooling effect of cooling assembly 1. Simultaneously, the liquid inlet 12 and liquid outlet 13 are located in a second direction of cooling assembly 1, which helps increase the temperature balance of cooling assembly 1 and avoid uneven heat exchange caused by local overcooling or overheating of cooling assembly 1. Cooling assembly 1 cools the air within the cavities corresponding to two adjacent battery cell layers 201 and the corresponding battery cell layers 201, thereby reducing the risk of thermal runaway of the multi-layer battery pack 200 and improving the safety of the multi-layer battery pack 200.

[0037] The first exhaust channel 21 and the second exhaust channel 22 are respectively connected to the explosion-proof valves 2023 of two adjacent battery cell layers 201. This facilitates the entry of high-temperature gas from the first air inlet 161 into the first exhaust channel 21 and / or the entry of high-temperature gas from the second air inlet 171 into the second exhaust channel 22 when thermal runaway occurs in the corresponding battery cell layer 201. This simplifies the design of the exhaust channel 2 of the cooling device 100, preventing high-temperature gas from flowing from at least one of the adjacent battery cell layers 201 into the other battery cell layer 201 when thermal runaway occurs, reducing the risk of thermal runaway in both adjacent battery cell layers 201 and further improving the safety of the battery pack.

[0038] According to the cooling device 100 of the multi-layer battery pack 200 of the embodiment of the present invention, the first air inlet 161 of the first exhaust channel 21 is suitable for being opposite to the explosion-proof valve 2023 of one of the two adjacent battery core layers 201, and the second air inlet 171 of the second exhaust channel 22 is suitable for being opposite to the explosion-proof valve 2023 of the other of the two adjacent battery core layers 201. As a result, the design of the exhaust channel 2 of the cooling device 100 is simplified, and the high-temperature gas channeling of at least one of the adjacent battery core layers 201 during thermal runaway is avoided, thereby reducing the risk of thermal runaway of the two adjacent battery core layers 201 and improving the safety of the battery pack. In addition, the cooling channel 11 provided between the two adjacent battery core layers 201 can cool the two adjacent battery core layers 201 and their cavities, further improving the safety of the battery pack.

[0039] According to some embodiments of the present invention, referring to Figure 5-Figure 18 The first exhaust channel 21 and the second exhaust channel 22 are respectively provided on both sides of the cooling assembly 1 in the third direction. With this arrangement, battery cell layers 201 can be provided on both sides of the cooling device 100 in the third direction. The battery cell layers 201 on both sides can be guided and exhausted through the first exhaust channel 21 and the second exhaust channel 22, respectively. This avoids the risk of explosion caused by the accumulation of high-temperature gas after thermal runaway, and also prevents the high-temperature gas from flowing through the battery cell layers 201 on both sides of the cooling device 100. This improves the cooling effect of the cooling device 100 on the multi-layer battery pack 200 and enhances the safety of the multi-layer battery pack 200.

[0040] Further, refer to Figure 2-Figure 7 The cooling assembly 1 includes a first cooling plate 14 and a second cooling plate 15 stacked along a third direction. The first cooling plate 14 and the second cooling plate 15 jointly define a cooling channel 11. The cooling channel 11 is wavy in shape. The first cooling plate 14 and the second cooling plate 15 cooperate to form a sealed cooling channel, thereby improving the stability and reliability of the cooling hot channel. As a result, it is beneficial to extend the path of the coolant flowing in the cooling channel 11, improve the cooling efficiency of the cooling assembly 1 for the high-temperature gas in the exhaust channel 2 and the cooling efficiency of the battery core layers 201 on the adjacent two sides, and improve the safety of the multi-layer battery pack 200. The side of the first cooling plate 14 away from the second cooling plate 15 and the side of the second cooling plate 15 away from the first cooling plate 14 can both be used for heat exchange, thereby increasing the heat exchange area of the cooling assembly 1 and improving the heat exchange efficiency.

[0041] Furthermore, refer to Figure 2-Figure 7, part of the first cooling plate 14 protrudes in a direction away from the second cooling plate 15 to form a first protrusion 141, and part of the second cooling plate 15 protrudes in a direction away from the first cooling plate 14 to form a second protrusion 151. In the third direction, the second protrusion 151 and the first protrusion 141 are opposite to each other to define the cooling channel 11. Therefore, the relative position of the first protrusion 141 of the first cooling plate 14 and the second protrusion 151 of the second cooling plate 15 is the flow position of the coolant, that is, the coolant flows in the cooling channel 11. Such an arrangement is conducive to increasing the flow rate of the coolant, further improving the cooling efficiency of the cooling assembly 1 for reducing the high-temperature gas in the exhaust channel 2 and the cooling efficiency of the battery core layers 201 on both sides.

[0042] According to some embodiments of the present invention, referring to Figure 8 and Figure 10 In the third direction, the first exhaust channel 21 or the second exhaust channel 22 is located on the side of the battery cell layer 201 adjacent to the cooling assembly 1. This shortens the path for gas to enter the first exhaust channel 21 or the second exhaust channel 22, allowing high-temperature gas to be quickly discharged along the first exhaust channel 21 or the second exhaust channel 22. This prevents high-temperature gas from flowing from at least one of the adjacent battery cell layers 201 to another battery cell layer 201 during thermal runaway, reducing the risk of thermal runaway caused by high-temperature gas crosstalk and further improving the safety of the battery pack.

[0043] According to some embodiments of the present invention, referring to Figures 1-10 The cooling assembly 1 further includes a third exhaust plate 16, which is disposed on a side of the first cooling plate 14 away from the second cooling plate 15. The third exhaust plate 16 has at least one first air inlet 161 formed therein, extending along the second direction. A portion of the second cooling plate 15 protrudes away from the first cooling plate 14 to form a third protrusion 152. The third protrusion 152 and the third exhaust plate 16 together define a first exhaust channel 21.

[0044] Reference Figure 10 and Figure 11 The third exhaust plate 16 and the first cooling plate 14 are stacked along the third direction. In the third direction, a first exhaust channel 21 is defined between the third protrusion 152 and the third exhaust plate 16. In the event of thermal runaway, high-temperature gas passes through the explosion-proof valve and the first air inlet 161 on the third exhaust plate 16 into the first exhaust channel 21, where it diffuses and is cooled. As the pressure in the first exhaust channel 21 increases, the cooled gas is discharged.

[0045] Further, refer to Figures 8-11The first exhaust port 211, liquid inlet 12, and liquid outlet 13 of the first exhaust channel 21 are located on the same side of the cooling device 100 in the second direction. This improves the regularity of the cooling device 100's layout and facilitates user access to the first exhaust port 211, liquid inlet 12, and liquid outlet 13. Furthermore, the length of the first exhaust channel 21 is reduced, thereby improving exhaust efficiency, preventing the impact of high-temperature gases on high-voltage electrical connections, and reducing the risk of thermal runaway in the multi-layer battery pack 200.

[0046] like Figure 10-11 As shown, the third protrusion 152 includes a first protrusion segment 1521 and a second protrusion segment 1522 connected to each other. The first protrusion segment 1521 extends along the second direction, and the second protrusion segment 1522 extends along the first direction and communicates with the first exhaust port 211. The arrangement of the first protrusion segment 1521 and the second protrusion segment 1522 helps define the direction of the first exhaust channel 21. The arrangement of the first protrusion segment 1521 helps increase the speed at which high-temperature gas enters the first exhaust channel 21, while the extension of the second protrusion segment 1522 along the first direction shortens the exhaust path of the high-temperature gas, thereby reducing the risk of thermal runaway and the corresponding risk of bulging and explosion of the battery cell layer 201.

[0047] In addition, refer to Figure 9-10 , and combined with Figure 12 The cooling device 100 of the multi-layer battery pack 200 also includes at least one first exhaust assembly 3, the first exhaust assembly 3 includes a first exhaust plate 31 and a second exhaust plate 32 stacked along a third direction, the first exhaust plate 31 and the second exhaust plate 32 jointly define a second exhaust channel 22, and the second exhaust channel 22 is located on the side of the battery core layer 201 away from the cooling assembly 1 in the third direction.

[0048] The first exhaust plate 31 can be disposed adjacent to the battery cell layer 201, and the second exhaust plate 32 can be disposed away from the battery cell layer 201; alternatively, the second exhaust plate 32 can be disposed adjacent to the battery cell layer 201, and the first exhaust plate 31 can be disposed away from the battery cell layer 201. The second exhaust channel 22 defined by the first exhaust plate 31 and the second exhaust plate 32 is spaced away from the cooling assembly 1 in the third direction. This allows the cooling assembly 1 to fully utilize its cooling effect on the high-temperature gas on one side of the battery cell layer 201 in the third direction, while the second exhaust channel 22 can fully utilize its function on the other side of the battery cell layer 201 in the third direction, thereby facilitating the processing speed of the high-temperature gas and avoiding the risk of thermal runaway caused by the accumulation of high-temperature gas.

[0049] Further, refer to Figure 9-10 , and combined with Figure 12, a plurality of through holes 311 are formed on the first exhaust plate 31. In the description of the present invention, "plurality" means two or more. The plurality of through holes 311 are connected to the second exhaust channel 22, and the plurality of through holes 311 are spaced apart along the first direction, and each through hole 311 extends along the second direction. In other words, the second exhaust plate 32 is arranged on the side of the first exhaust plate 31 away from the corresponding battery layer 201, and the first exhaust plate 31 is designed to be adjacent to the corresponding battery layer 201, which is conducive to the high-temperature gas in the battery layer 201 entering the second exhaust channel 22 through the plurality of through holes 311 and then being discharged. The battery layer 201 corresponding to the above-mentioned cooling device 100 can be provided with a plurality of explosion-proof valves 2023 designed to be spaced apart along the first direction. The plurality of explosion-proof valves 2023 correspond to the plurality of through holes 311 one-to-one. The explosion-proof valves 2023 can be made to give way at the position of the through holes 311 to prevent the explosion-proof valves 2023 from being damaged. At the same time, the distance between the explosion-proof valves 2023 and the through holes 311 can be reduced, thereby improving the exhaust efficiency. Each through hole 311 extends along the second direction, which helps increase the gas flow rate entering the exhaust channel 2 from each through hole 311. At the same time, multiple explosion-proof valves 2023 can be arranged along the second direction in the battery cell layer 201 corresponding to each through hole 311, meeting the exhaust requirements while reducing the processing difficulty of the first exhaust plate 31.

[0050] According to some embodiments of the present invention, referring to Figure 13-15 The cooling assembly 1 further includes a fourth exhaust plate 17, which is disposed on a side of the second cooling plate 15 away from the first cooling plate 14. The fourth exhaust plate 17 is formed with at least one second air inlet 171, which extends along the second direction. A portion of the second cooling plate 15 is recessed toward the first cooling plate 14 to form a recessed portion 153. The recessed portion 153 and the fourth exhaust plate 17 together define a second exhaust passage 22.

[0051] The fourth exhaust plate 17 is stacked on the side of the second cooling plate 15 away from the first cooling plate 14. The recessed portion 153 on the second cooling plate 15 corresponds to at least a portion of the second air inlet 171 of the fourth exhaust plate 17. High-temperature gas can enter the second exhaust channel 22 through the second air inlet 171, thereby discharging the high-temperature gas from the battery cell layer 201 corresponding to the fourth exhaust plate 17. This reduces the risk of thermal runaway of the multi-layer battery pack 200 and improves the safety of the multi-layer battery pack 200.

[0052] Furthermore, the second exhaust port 221, the liquid inlet 12 and the liquid outlet 13 of the second exhaust channel 22 are located on one side of the cooling device 100 in the second direction. Figure 13-15The recessed portion 153 includes a first recessed section 1531 and a second recessed section 1532 connected to each other. The first recessed section 1531 extends along the second direction, and the second recessed section 1532 extends along the first direction and communicates with the second exhaust port 221. The second exhaust port 221, the liquid inlet 12, and the liquid outlet 13 of the second exhaust channel 22 are arranged in an integrated manner, facilitating user access to the second exhaust port 221, the liquid inlet 12, and the liquid outlet 13. This also reduces the length of the second exhaust channel 22, thereby improving exhaust efficiency and preventing the impact of high-temperature gases on high-voltage electrical connections, reducing the risk of thermal runaway in the multi-layer battery pack 200.

[0053] like Figure 13-15 As shown, the first recessed section 1531 is adapted to be opposite to the second air inlet 171, thereby increasing the speed at which the high-temperature gas enters the second exhaust channel 22. The second recessed section 1532 extends along the first direction, shortening the exhaust path of the high-temperature gas, thereby reducing the risk of thermal runaway and reducing the risk of bulging and explosion of the corresponding battery core layer 201.

[0054] According to some embodiments of the present invention, referring to Figure 16-18 The cooling device 100 of the multi-layer battery pack 200 further includes a plurality of second exhaust assemblies 4. In the third direction, each second exhaust assembly 4 is disposed on a side of the battery cell layer 201 away from the cooling assembly 1. The second exhaust assembly 4 includes a fifth exhaust plate 41 and a sixth exhaust plate 42 stacked along the third direction. The plurality of second exhaust assemblies 4 define a first exhaust channel 21 and a second exhaust channel 22, respectively. Figure 17 and Figure 18 As shown, two second exhaust assemblies 4 are provided on both sides of the battery core layer 201 away from the cooling assembly 1. The two exhaust assemblies 3 define a first exhaust channel 21 and a second exhaust channel 22, respectively. Thus, the first exhaust channel 21 and the second exhaust channel 22 can be used to guide high-temperature gas from the battery core layer 201 away from the cooling assembly 1, thereby reducing the risk of thermal runaway of the battery core layer 201 and improving the safety of the battery core layer 201.

[0055] According to other embodiments of the present invention, for example, referring to Figure 10 As shown, the first exhaust channel 21 and the second exhaust channel 22 are each formed with a plurality of sub-inlets 222 on one side in the second direction. The plurality of sub-inlets 222 are spaced apart along the first direction and face the explosion-proof valves 2023 of the battery cell layer 201. High-temperature gas enters the corresponding first exhaust channel 21 or second exhaust channel 22 along the plurality of sub-inlets 222 and is then discharged, thereby increasing the exhaust efficiency of the high-temperature gas and reducing the risk of thermal runaway of the multi-layer battery pack 200.

[0056] According to the multi-layer battery pack 200 of the second embodiment of the present invention, Figure 4-Figure 18, including: multiple battery core layers 201, multiple battery core layers 201 are arranged along a third direction; at least one cooling device 100, at least part of the cooling device 100 is arranged between two adjacent battery core layers 201, and the cooling device 100 is a cooling device 100 of the multi-layer battery pack 200 according to the above-mentioned first aspect embodiment of the present invention.

[0057] According to the multi-layer battery pack 200 of an embodiment of the present invention, by arranging the above-mentioned cooling device 100 between two adjacent battery cell layers 201, it is beneficial to respectively discharge the high-temperature gas of each battery cell layer 201 to the outside of the multi-layer battery pack 200, and avoid the high-temperature gas interfering with the adjacent battery cell layers 201, thereby facilitating the use safety of the multi-layer battery pack 200.

[0058] Further, refer to Figure 4-Figure 7 Each cell layer 201 includes a plurality of cells 202 arranged along the second direction, and each cell 202 extends along the first direction. Each cell 202 includes a cell body 2021, a terminal 2022, and an explosion-proof valve 2023. The terminal 2022 is disposed on one side of the cell body 2021 in the first direction, and the explosion-proof valve 2023 is disposed on a side of the cell body 2021 adjacent to the exhaust channel 2 in the third direction.

[0059] According to some embodiments of the present invention, the explosion-proof valves 2023 of the battery cells 202 are positioned opposite the first air inlet 161 of the first exhaust channel 21 or the second air inlet 171 of the second exhaust channel 22. This arrangement improves the efficiency of the explosion-proof valves 2023 entering the first exhaust channel 21 or the second exhaust channel 22, thereby enhancing the cooling device 100's ability to reduce the temperature of the multi-layer battery pack 200 and improving the safety of the multi-layer battery pack 200.

[0060] For example, in Figure 4-Figure 7 In the example, each battery cell layer 201 includes twenty battery cells 202, and the twenty battery cells 202 are arranged along the second direction. The pole 2022 and the explosion-proof valve 2023 of each battery cell 202 are spaced apart along the first direction to prevent the explosion-proof valve 2023 from affecting high-voltage components such as the pole 2022. The explosion-proof valve 2023 is oriented in the third direction toward the first air inlet 161 of the first exhaust channel 21 or the second air inlet 171 of the second exhaust channel 22, which is conducive to shortening the distance between the high-temperature gas and the cooling device 100. When the battery cell 202 thermally runs away, the high-temperature gas in the battery cell 202 is discharged from the explosion-proof valve 2023 and discharged through the cooling device 100, avoiding affecting the adjacent battery cell layer 201, thereby improving the safety of the multi-layer battery pack 200.

[0061] like Figure 4-Figure 7As shown, the cooling device 100 between two battery cell layers 201 arranged along the third direction includes: a third exhaust plate 16, a first cooling plate 14, a second cooling plate 15, and a fourth exhaust plate 17 stacked in sequence along the third direction. As a result, high-temperature gas generated by the upper battery cell layer 201 enters the first exhaust channel 21 through the first air inlet 161 on the third exhaust plate 16 and is then discharged. High-temperature gas generated by the lower battery cell layer 201 can enter the second exhaust channel 22 through the second air inlet 171, thereby discharging the high-temperature gas from the battery cell layer 201 corresponding to the fourth exhaust plate 17.

[0062] According to some embodiments of the present invention, referring to Figures 8-18 Each cell layer 201 includes multiple cell groups 203, which are spaced apart along a first direction. The multiple cells 202 in each cell group 203 are arranged along a second direction. Each cell 202 includes a cell body 2021, a terminal 2022, and an explosion-proof valve 2023. The terminal 2022 is located on one side of the cell body 2021 in the third direction. The explosion-proof valve 2023 is located on a side of the cell body 2021 adjacent to the exhaust channel 2 in the third direction.

[0063] Each cell layer 201 includes eight cell groups 203, and the eight cell groups 203 are arranged along the first direction. The cells 202 in each cell group 203 are arranged along the second direction. Correspondingly, the cooling device 100 includes eight first exhaust channels 21 and eight second exhaust channels 22. The eight first exhaust channels 21 are respectively opposite to all the explosion-proof valves 2023 of the eight cell groups 203 of one cell layer 201, and the eight second exhaust channels 22 are respectively opposite to all the explosion-proof valves 2023 of the eight cell groups 203 of another cell layer 201. In this way, it is beneficial to exhaust each cell group 203 separately, reduce the flow of high-temperature gas between multiple cell groups 203 in the same cell layer 201, and thus help to further reduce the risk of thermal runaway of the multi-layer battery pack 200 and improve the safety of the multi-layer battery pack 200.

[0064] Furthermore, the explosion-proof valves 2023 of two adjacent battery cells 202 along the third direction are opposite to each other, and a cooling assembly 1, a first exhaust channel 21 and a second exhaust channel 22 are provided between two adjacent battery cell layers 201. The first exhaust channel 21 and the second exhaust channel 22 are respectively provided on both sides of the cooling assembly 1 in the third direction. Figure 13-15 As shown, the battery cells 202 of the upper battery cell group 203 are inverted, and the battery cells 202 of the lower battery cell group 203 are upright, so that the explosion-proof valves 2023 of all battery cells 202 are aligned with the middle cooling device 100, and the high-temperature gas is discharged through the exhaust channel 2 in the cooling device 100.

[0065] According to other embodiments of the present invention, the explosion-proof valves 2023 of two adjacent battery cells 202 along the third direction face the same side, a cooling assembly 1 and a first exhaust channel 21 are provided between two adjacent battery cell layers 201, and the two adjacent battery cell layers 201 are respectively the first battery cell layer 201 and the second battery cell layer 201. The first exhaust channel 21 is located between the cooling assembly 1 and the explosion-proof valve 2023 of the first battery cell layer 201, and the second exhaust channel 22 is provided adjacent to the explosion-proof valve 2023 of the second battery cell layer 201. Figure 9-10 As shown, the battery cells 202 of the upper battery cell group 203 and the battery cells 202 of the lower battery cell group 203 are both inverted, and an exhaust assembly 3 consisting of a first exhaust plate 31 and a second exhaust plate 32 is provided on the side of the upper battery cell group 203 away from the lower battery cell group 2032, and a first cooling plate 14, a second cooling plate 15 and a fourth exhaust plate 17 are provided between two adjacent battery cell layers 201. The exhaust assembly 3 can be integrated with the tray of the multi-layer battery pack 200. This is not specifically limited here. As a result, the high-temperature gas of the upper battery cell group 203 enters the exhaust assembly 3 from the explosion-proof valve 2023 on the side away from the lower battery cell group 2032 and is then discharged, while the high-temperature gas of the lower battery cell group 203 enters the middle second exhaust channel 22 from the explosion-proof valve 2023 and is then discharged.

[0066] Among them, the gases corresponding to the eight battery cell groups 203 all flow along the second direction and then along the first direction until they flow out of the multi-layer battery pack 200. Since the gases flow along the direction of the airflow, they will not enter the remaining exhaust channels 2 to form interference, which can reduce the risk of thermal runaway.

[0067] According to some further embodiments of the present invention, the explosion-proof valves 2023 of two adjacent battery cells 202 along the third direction are separated from each other, a cooling assembly 1 is provided between two adjacent battery cell layers 201, and the two adjacent battery cell layers 201 are respectively the first battery cell layer 201 and the second battery cell layer 201, the first exhaust channel 21 is provided adjacent to the explosion-proof valve 2023 of the first battery cell layer 201, and the second exhaust channel 22 is provided adjacent to the explosion-proof valve 2023 of the second battery cell layer 201. Figure 17-18 As shown, the upper battery cell layer 201 and the lower battery cell layer 201 are separated by a cooling assembly 1, the explosion-proof valves 2023 of the two battery cells 202 face away from each other, and the two battery cell layers 201 are each provided with an exhaust assembly 3 consisting of a first exhaust plate 31 and a second exhaust plate 32 on the side away from each other. Alternatively, the upper battery cell layer 201 and the lower battery cell layer 201 are separated, and the two battery cell layers 201 are provided with a cooling device 100 consisting of a third exhaust plate 16, a first cooling plate 14, and a second cooling plate 15 on the side away from each other, or a cooling device 100 consisting of a first cooling plate 14, a second cooling plate 15, and a fourth exhaust plate 17 on the side away from each other.

[0068] A vehicle (not shown) according to an embodiment of the third aspect of the present invention includes a multi-layer battery pack 200 according to an embodiment of the second aspect of the present invention.

[0069] According to the vehicle of the embodiment of the present invention, the use of the above-mentioned multi-layer battery pack 200 is beneficial to improving the energy supply reliability and stability of the vehicle, thereby helping to increase the vehicle's mileage, improve the vehicle's operating stability, and further enhance the vehicle's market competitiveness.

[0070] Other structures and operations of the multi-layer battery pack 200 and the vehicle according to the embodiment of the present invention are well known to those skilled in the art and will not be described in detail here.

[0071] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0072] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0073] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example.

[0074] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A cooling device for a multi-layer battery pack, characterized in that: include: A cooling assembly having cooling channels arranged along a first direction, and a liquid inlet and a liquid outlet formed on one side of the cooling assembly in a second direction, the liquid inlet and the liquid outlet being respectively in communication with the cooling channels, wherein the cooling assembly is adapted to be disposed between two adjacent battery core layers in a third direction, the first direction, the second direction, and the third direction being orthogonal to each other; An exhaust channel, wherein the exhaust channel includes a first exhaust channel and a second exhaust channel, wherein the first air inlet of the first exhaust channel is suitable for being opposite to the explosion-proof valve of one of the two adjacent battery core layers, and the second air inlet of the second exhaust channel is suitable for being opposite to the explosion-proof valve of the other of the two adjacent battery core layers.

2. The cooling device for a multi-layer battery pack according to claim 1, characterized in that: The first exhaust channel and the second exhaust channel are respectively provided on both sides of the cooling assembly in the third direction.

3. The cooling device for a multi-layer battery pack according to claim 1, wherein: The cooling assembly includes a first cooling plate and a second cooling plate stacked along the third direction. The first cooling plate and the second cooling plate jointly define the cooling channel. The cooling channel is wavy in shape.

4. The cooling device for a multi-layer battery pack according to claim 3, characterized in that: Part of the first cooling plate protrudes away from the second cooling plate to form a first protrusion, and part of the second cooling plate protrudes away from the first cooling plate to form a second protrusion. In the third direction, the second protrusion and the first protrusion are opposite to each other to define the cooling channel.

5. The cooling device for a multi-layer battery pack according to claim 2, characterized in that: In the third direction, the first exhaust channel and / or the second exhaust channel is located on a side of the battery core layer adjacent to the cooling assembly.

6. The cooling device for a multi-layer battery pack according to claim 5, characterized in that: The cooling assembly further comprises: a third exhaust plate, the third exhaust plate being provided on a side of the first cooling plate away from the second cooling plate, the third exhaust plate being formed with at least one of the first air inlets, the first air inlet extending along the second direction; Part of the second cooling plate protrudes in a direction away from the first cooling plate to form a third protrusion, and the third protrusion and the third exhaust plate together define the first exhaust channel.

7. The cooling device for a multi-layer battery pack according to claim 6, characterized in that: The first exhaust port of the first exhaust channel, the liquid inlet, and the liquid outlet are located on the same side of the cooling device in the second direction; The third protrusion includes a first protrusion segment and a second protrusion segment connected to each other, the first protrusion segment extends along the second direction, and the second protrusion segment extends along the first direction and communicates with the first exhaust port.

8. The cooling device for a multi-layer battery pack according to claim 6, characterized in that: Also includes: At least one first exhaust assembly, the first exhaust assembly includes a first exhaust plate and a second exhaust plate stacked along the third direction, the first exhaust plate and the second exhaust plate jointly define the second exhaust channel, and the second exhaust channel is located on the side of the battery core layer away from the cooling assembly in the third direction.

9. The cooling device for a multi-layer battery pack according to claim 8, characterized in that: A plurality of through holes are formed on the first exhaust plate. The plurality of through holes are communicated with the second exhaust channel. The plurality of through holes are spaced apart along the first direction, and each of the through holes extends along the second direction.

10. The cooling device for a multi-layer battery pack according to claim 6, wherein: The cooling assembly further comprises: a fourth exhaust plate, the fourth exhaust plate being provided on a side of the second cooling plate away from the first cooling plate, the fourth exhaust plate being formed with at least one second air inlet, the second air inlet extending along the second direction; Part of the second cooling plate is recessed toward the first cooling plate to form a recessed portion, and the recessed portion and the fourth exhaust plate together define the second exhaust channel.

11. The cooling device for a multi-layer battery pack according to claim 10, characterized in that: The second exhaust port, the liquid inlet, and the liquid outlet of the second exhaust channel are located on one side of the cooling device in the second direction; The concave portion includes a first concave section and a second concave section connected to each other, the first concave section extends along the second direction, and the second concave section extends along the first direction and communicates with the second exhaust port.

12. The cooling device for a multi-layer battery pack according to claim 2, wherein: Also includes: Multiple second exhaust assemblies, each of the second exhaust assemblies is arranged on the side of the battery core layer away from the cooling assembly in the third direction, the second exhaust assemblies include a fifth exhaust plate and a sixth exhaust plate stacked along the third direction, and the multiple second exhaust assemblies respectively define the first exhaust channel and the second exhaust channel.

13. The cooling device for a multi-layer battery pack according to claim 1, wherein: The first exhaust channel and the second exhaust channel are both formed with a plurality of sub-air inlets on one side of the third direction. The plurality of sub-air inlets are spaced apart along the first direction, and the plurality of sub-air inlets are opposite to the explosion-proof valve of the battery core layer.

14. A multi-layer battery pack, characterized in that: include: A plurality of battery core layers, wherein the plurality of battery core layers are arranged along the third direction; At least one cooling device, at least part of the cooling device is arranged between two adjacent battery core layers, and the cooling device is a cooling device of a multi-layer battery pack according to any one of claims 1-13.

15. The multi-layer battery pack according to claim 14, characterized in that: Each of the battery core layers includes a plurality of battery cores, the plurality of battery cores are arranged along the second direction, and each of the battery cores extends along the first direction; Each of the battery cells includes a battery cell body, a pole and an explosion-proof valve. The pole is arranged on one side of the battery cell body in the first direction, and the explosion-proof valve is arranged on one side of the battery cell body adjacent to the exhaust channel in the third direction.

16. The multi-layer battery pack according to claim 15, characterized in that: The explosion-proof valves of the battery cells are opposite to the first air inlet of the first exhaust channel or the second air inlet of the second exhaust channel.

17. The multi-layer battery pack according to claim 14, characterized in that: Each of the battery core layers includes a plurality of battery core groups, the plurality of battery core groups are spaced apart along the first direction, and the plurality of battery cells in each of the battery core groups are arranged along the second direction; Each of the battery cells includes a battery cell body, a pole and an explosion-proof valve. The pole is arranged on one side of the battery cell body in the third direction. The explosion-proof valve is arranged on one side of the battery cell body adjacent to the exhaust channel in the third direction.

18. The multi-layer battery pack according to claim 17, characterized in that: The explosion-proof valves of two adjacent battery cells along the third direction are opposite to each other, and a cooling assembly, a first exhaust channel and a second exhaust channel are provided between two adjacent battery cell layers. The first exhaust channel and the second exhaust channel are respectively provided on both sides of the cooling assembly in the third direction.

19. The multi-layer battery pack according to claim 17, wherein: The explosion-proof valves of two adjacent battery cells along the third direction face the same side, a cooling assembly and a first exhaust channel are provided between two adjacent battery cell layers, and the two adjacent battery cell layers are respectively a first battery cell layer and a second battery cell layer. The first exhaust channel is located between the cooling assembly and the explosion-proof valve of the first battery cell layer, and the second exhaust channel is provided adjacent to the explosion-proof valve of the second battery cell layer.

20. The multi-layer battery pack according to claim 17, wherein: The explosion-proof valves of two adjacent battery cells along the third direction are away from each other, a cooling assembly is provided between the two adjacent battery cell layers, the two adjacent battery cell layers are respectively the first battery cell layer and the second battery cell layer, the first row of channels is adjacent to the explosion-proof valve of the first battery cell layer, and the second exhaust channel is located at the explosion-proof valve of the second battery cell layer.

21. A vehicle, characterized in that: Comprising a multi-layer battery pack according to any one of claims 14-20.

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