Battery pack, power battery and engineering machinery vehicle

Abstract

The invention relates to a battery pack, a power battery and an engineering machinery vehicle, the battery pack comprises a box body, a first module and a second module, the box body is provided with an accommodating cavity, and the first module and the second module are arranged in the accommodating cavity side by side along a first direction; the first module comprises a plurality of first battery cells, a first mounting rack and a second mounting rack, the first mounting rack and the second mounting rack are arranged side by side along a second direction, and a part of the plurality of first battery cells are arranged on the first mounting rack side by side along a third direction; the other part of the plurality of first battery monomers are arranged on the second mounting frame side by side along a third direction, and any two of the three directions are perpendicular to each other; the second module comprises a plurality of second battery monomers, a third mounting rack and a fourth mounting rack, the third mounting rack and the fourth mounting rack are arranged side by side in the second direction, a part of the second battery monomers are arranged on the third mounting rack side by side in the third direction, and the other part of the second battery monomers are arranged on the fourth mounting rack side by side in the third direction.

Description

Technical Field

[0001] The present disclosure relates to the technical field of engineering machinery, and in particular to a battery pack, a power battery and an engineering machinery vehicle. Background Art

[0002] The electrification of mining machinery and equipment is a trend that can improve the production efficiency and safety of mining machinery and equipment. At present, many mining machinery and equipment around the world are adopting electrification technology to replace traditional fuel drive technology, which can not only reduce the use of fuel, but also reduce the maintenance cost of mining vehicles.

[0003] In addition, electrification technology can also improve the reliability and precision of mining machinery and equipment, thereby improving the production efficiency of mines. Large-scale mining machinery mainly includes large-tonnage graders, loaders, bulldozers, mining trucks and other equipment.

[0004] The voltage platform of large-tonnage mining engineering machinery equipment is as high as 800-1000V and the total power of the machine reaches 1000-3000kWh, which puts more stringent requirements on the capacity of the power battery.

[0005] It should be noted that the information disclosed in the background technology section of this disclosure is only intended to increase the understanding of the overall background of this disclosure, and should not be regarded as an admission or any form of suggestion that the information constitutes prior art already known to those skilled in the art. The above statements are only used to provide background technology information related to this application, and do not necessarily constitute prior art. Summary of the invention

[0006] The embodiments of the present disclosure provide a battery pack, a power battery and an engineering vehicle, which can effectively increase the capacity of the battery pack.

[0007] According to a first aspect of the present disclosure, there is provided a battery pack, comprising:

[0008] A box body having a containing cavity;

[0009] The first module and the second module are arranged side by side in the accommodating cavity along a first direction;

[0010] The first module includes a plurality of first battery cells, a first mounting frame and a second mounting frame, the first mounting frame and the second mounting frame are arranged side by side along the second direction, a portion of the plurality of first battery cells are arranged side by side on the first mounting frame along the third direction, another portion of the plurality of first battery cells are arranged side by side on the second mounting frame along the third direction, and any two directions among the first direction, the second direction and the third direction are perpendicular;

[0011] The second module includes multiple second battery cells, a third mounting frame and a fourth mounting frame, the third mounting frame and the fourth mounting frame are arranged side by side along the second direction, a portion of the multiple second battery cells are arranged side by side on the third mounting frame along the third direction, and another portion of the multiple second battery cells are arranged side by side on the fourth mounting frame along the third direction.

[0012] In some embodiments, the box body includes a ring-shaped box body with openings at both ends and a bottom plate for closing the opening at one end of the box body. The box body and the bottom plate are surrounded to form a accommodating cavity. The bottom plate includes a main body portion located in the accommodating cavity. The main body portion is provided with a first connecting hole and a second connecting hole. The first mounting bracket is installed on the bottom plate through the first connecting hole, and the third mounting bracket is installed on the bottom plate through the second connecting hole.

[0013] In some embodiments, the main body includes a first support portion and a second support portion connected to the first support portion, the thickness of the first support portion is greater than the thickness of the second support portion, and the first connecting hole and the second connecting hole are provided in the first support portion.

[0014] In some embodiments, the base plate includes an extension portion located outside the accommodating cavity, and the extension portion is provided with a third connecting hole. The box body also includes a flange arranged at the end of the box body away from the base plate. The flange is annular and arranged outside the accommodating cavity. The flange is parallel to the extension portion, and a fourth connecting hole is provided on the flange.

[0015] In some embodiments, the battery pack further includes a sealing strip, and a groove is provided at the end of the box body away from the bottom plate, and the sealing strip is installed in the groove.

[0016] In some embodiments, the first mounting frame includes a first support plate, a first support member and a second support member, the first support plate is provided with a first cooling channel for circulating a coolant, the first support member and the second support member are installed on the first support plate at intervals along a third direction, the second support member is arranged between the two first support members, the first battery cell is arranged between the first support member and the second support member, and the first support plate is used to support the first battery cell.

[0017] In some embodiments, the first mounting frame also includes an annular frame, the first support plate is installed in the frame, the first support member and the second support member are installed on the frame and are located on the side of the first support plate close to the second mounting frame, a first mounting hole is provided on the frame, and the frame is installed on the box through the first mounting hole.

[0018] In some embodiments, the second mounting frame includes a second support plate, a third support member and a fourth support member, the second support plate is provided with a second cooling channel for circulating coolant, the third support member and the fourth support member are installed on the second support plate at intervals along a third direction, the fourth support member is arranged between the two third support members, the first battery cell is arranged between the third support member and the fourth support member, the second support plate is used to support the first battery cell, the first support member is provided with a second mounting hole, the third support member is provided with a third mounting hole, the first module includes a first connecting member, the first connecting member passes through the third mounting hole and is inserted into the second mounting hole to connect the first support member and the third support member.

[0019] In some embodiments, the second mounting frame further includes two connecting plates, the connecting plates are perpendicular to the second supporting plate, and the second supporting plate, the third supporting member and the fourth supporting member are all welded and connected between the two connecting plates.

[0020] In some embodiments, the frame includes a first frame and a second frame extending in a direction perpendicular to the first direction and arranged opposite to each other, and the distance between the first mounting hole on the first frame and the first mounting hole on the second frame is greater than the width between the two connecting plates.

[0021] In some embodiments, the first module further includes a support frame connected between the first support plate and the second support plate, and the support frame is located on the sides of the first support plate and the second support plate.

[0022] In some embodiments, an ear plate is provided on the side of the second mounting frame, a fourth mounting hole is provided on the ear plate, a fifth mounting hole and a sixth mounting hole are provided on the support frame, and the first module also includes a second connecting member and a third connecting member, the second connecting member passes through the fourth mounting hole and the fifth mounting hole to connect the second mounting frame and the support frame, and the third connecting member passes through the sixth mounting hole and the first mounting hole to connect the first mounting frame and the support frame.

[0023] In some embodiments, the first module also includes a first protective cover, which is U-shaped and made of insulating material. The first protective cover is mounted on the outside of the first mounting frame and the second mounting frame to cover the side of the second mounting frame away from the first mounting frame and the two side surfaces of the first mounting frame and the second mounting frame.

[0024] In some embodiments, there is a gap between the inner wall of the first protective cover and the first battery cell, and the gap forms a smoke exhaust channel for gas to flow.

[0025] According to a second aspect of the present disclosure, a power battery is provided, comprising a plurality of the above-mentioned battery packs, wherein the plurality of battery packs are stacked along a second direction.

[0026] According to a third aspect of the present disclosure, there is provided an engineering machinery vehicle, comprising the above-mentioned battery pack, or comprising the above-mentioned power battery.

[0027] Based on the above technical solution, the present invention discloses a battery pack including at least two modules, the two modules are arranged side by side along a first direction, and each module includes at least two mounting frames, the two mounting frames are stacked along a second direction, and multiple battery cells are installed in each mounting frame along a third direction. Therefore, the structure of the battery pack is relatively compact and the capacity is large, which is conducive to achieving the purpose of a single battery pack to meet the power supply requirements of ultra-high voltage and large-capacity battery systems of large-scale engineering machinery. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The drawings described herein are used to provide a further understanding of the present disclosure and constitute a part of the present application. The illustrative embodiments of the present disclosure and their descriptions are used to explain the present disclosure and do not constitute an improper limitation on the present disclosure. In the drawings:

[0029] Figure 1 Schematic diagram of the structure of some embodiments of the battery pack provided by the present disclosure.

[0030] Figure 2 A schematic diagram of the structure of the box in some embodiments of the battery pack provided by the present disclosure.

[0031] Figure 3 This is a schematic structural diagram of the first module in some embodiments of the battery pack provided by the present disclosure.

[0032] Figure 4 A partial structural schematic diagram of the first module in some embodiments of the battery pack provided in the present disclosure.

[0033] Figure 5 A schematic diagram of the structure of the first mounting frame in some embodiments of the battery pack provided in the present disclosure.

[0034] Figure 6 A schematic diagram of the structure of a second mounting frame in some embodiments of the battery pack provided in the present disclosure.

[0035] Figure 7 A schematic diagram of the structure of a support frame in some embodiments of the battery pack provided in the present disclosure.

[0036] Figure 8 A schematic diagram of the structure of a protective cover in some embodiments of the battery pack provided by the present disclosure.

[0037] Fig. 9 Schematic diagram of the structure of some embodiments of the power battery provided by the present disclosure.

[0038] In the figure:

[0039] 100. Battery pack;

[0040] 1. Box body; 11. Accommodating cavity; 12. Box body; 121. Groove; 13. Bottom plate; 131. Main body; 1311. First connecting hole; 1312. Second connecting hole; 1313. First supporting part; 1314. Second supporting part; 132. Extending part; 1321. Third connecting hole; 14. Convex edge; 141. Fourth connecting hole; 15. Rib;

[0041] 2. a first module; 21. a first battery cell;

[0042] 22, first mounting frame; 221, first supporting plate; 222, first supporting member; 2221, second mounting hole; 223, second supporting member; 224, frame; 2241, first mounting hole; 2242, first frame; 2243, second frame; 225, second faucet; 226, hoisting sleeve;

[0043] 23, second mounting frame; 231, second supporting plate; 232, third supporting member; 2321, third mounting hole; 233, fourth supporting member; 234, connecting plate; 235, ear plate; 2351, fourth mounting hole; 236, third faucet; 237, third supporting plate;

[0044] 24, support frame; 241, fifth mounting hole; 242, sixth mounting hole; 243, vertical plate; 244, horizontal plate; 245, side plate;

[0045] 25. Protective cover; 251. Seventh mounting hole;

[0046] 26. Insulation cotton; 271. First copper bar; 272. Second copper bar; 273. First aluminum bar; 28. Lifting ring; 291. Pipe joint; 292. Fuse; 293. BMS connection plate;

[0047] 3. Second module; 4. Sealing strip; 5. Explosion-proof valve; 6. High-voltage output connector; 7. Communication connector; 8. Manual maintenance switch; 9. First faucet; 10. Maintenance panel. DETAILED DESCRIPTION

[0048] The technical solutions in the embodiments will be described clearly and completely below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0049] In the description of the present disclosure, it should be understood that the terms "center", "lateral", "longitudinal", "front", "back", "left", "right", "up", "down", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like 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 disclosure and simplifying the description, and do not indicate or imply 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 scope of protection of the present disclosure.

[0050] refer to Figures 1 to 4 As shown, in some embodiments of the battery pack 100 provided in the present disclosure, the battery pack 100 includes a case 1, a first module 2 and a second module 3, the case 1 has a accommodating cavity 11, and the first module 2 and the second module 3 are arranged side by side in the accommodating cavity 11 along a first direction.

[0051] Among them, the first module 2 includes multiple first battery cells 21, a first mounting frame 22 and a second mounting frame 23, the first mounting frame 22 and the second mounting frame 23 are arranged side by side along the second direction, a part of the multiple first battery cells 21 are arranged side by side on the first mounting frame 22 along the third direction, and another part of the multiple first battery cells 21 are arranged side by side on the second mounting frame 23 along the third direction, and any two directions among the first direction, the second direction and the third direction are perpendicular.

[0052] The second module 3 includes a plurality of second battery cells, a third mounting frame and a fourth mounting frame, the third mounting frame and the fourth mounting frame are arranged side by side along the second direction, a portion of the plurality of second battery cells are arranged side by side on the third mounting frame along the third direction, and another portion of the plurality of second battery cells are arranged side by side on the fourth mounting frame along the third direction.

[0053] In the embodiment provided in the present disclosure, the battery pack 100 includes at least two modules, the two modules are arranged side by side along a first direction, and each module includes at least two mounting frames, the two mounting frames are stacked along a second direction, and multiple battery cells are installed in each mounting frame along a third direction. Therefore, the structure of the battery pack 100 is relatively compact and the capacity is large, which is conducive to achieving the purpose of a single battery pack 100 to meet the power supply requirements of ultra-high voltage and large-capacity battery systems of large-scale engineering machinery.

[0054] like Figure 2As shown, in some embodiments, the box body 1 includes a ring-shaped box body 12 with openings at both ends and a bottom plate 13 for closing the opening at one end of the box body 12. The box body 12 and the bottom plate 13 surround and form a accommodating cavity 11. The bottom plate 13 includes a main body 131 located in the accommodating cavity 11. The main body 131 is provided with a first connecting hole 1311 and a second connecting hole 1312. The first mounting bracket 22 is installed on the bottom plate 13 through the first connecting hole 1311, and the third mounting bracket is installed on the bottom plate 13 through the second connecting hole 1312.

[0055] By setting a first connecting hole 1311 and a second connecting hole 1312 on the main body 131 located in the accommodating cavity 11, the first mounting bracket 22 can be installed on the base plate 13 through the first connecting hole 1311, and the third mounting bracket can be installed on the base plate 13 through the second connecting hole 1312, thereby achieving the purpose of installing the first module 2 and the second module 3 in the box body 1.

[0056] In some embodiments, the main body 131 includes a first support portion 1313 and a second support portion 1314 connected to the first support portion 1313 , the thickness of the first support portion 1313 is greater than the thickness of the second support portion 1314 , and the first connection hole 1311 and the second connection hole 1312 are provided in the first support portion 1313 .

[0057] By providing the first support portion 1313 and the second support portion 1314 of different thicknesses, and providing the first connection hole 1311 and the second connection hole 1312 on the thicker first support portion 1313, the installation stability of the first module 2 and the second module 3 can be effectively improved. The thinner second support portion 1314 can reduce the overall weight of the bottom plate 13, providing weight allowance for other components of the battery pack 100.

[0058] The specific structure, shape and number of the first support portion 1313 and the second support portion 1314 can be flexibly set as needed.

[0059] In some embodiments, the main body 131 includes multiple first support portions 1313 and multiple second support portions 1314, the first support portions 1313 are strip-shaped, the second support portions 1314 are block-shaped, the multiple first support portions 1313 are cross-arranged to form a grid shape, and the second support portions 1314 are arranged in the spaces formed by the intersection of the multiple first support portions 1313.

[0060] In some embodiments, the first connection hole 1311 and the second connection hole 1312 are disposed on the first support portion 1313 extending along the third direction. The first support portion 1313 extending along the third direction is longer, which can increase the number of the first connection holes 1311 and the second connection holes 1312, thereby effectively improving the stability and reliability of the connection.

[0061] In some embodiments, the bottom plate 13 includes an extension portion 132 located outside the accommodating cavity 11, and the extension portion 132 is provided with a third connecting hole 1321. The box body 1 also includes a flange 14 arranged at the end of the box body 12 away from the bottom plate 13. The flange 14 is annular and is arranged outside the accommodating cavity 11. The flange 14 is parallel to the extension portion 132, and a fourth connecting hole 141 is provided on the flange 14.

[0062] By providing the extension portion 132 and the flange 14, when multiple battery packs 100 are stacked along the second direction, the extension portion 132 of the upper battery pack 100 can be aligned with the flange 14 on the lower battery pack 100, and the extension portion 132 and the flange 14 can be connected by a connecting member passing through the third connecting hole 1321 and the fourth connecting hole 141, thereby achieving relative fixation of the upper and lower battery packs 100.

[0063] In some embodiments, the battery pack further includes a sealing strip 4 , and a groove 121 is provided at the end of the box body 12 away from the bottom plate 13 , and the sealing strip 4 is installed in the groove 121 .

[0064] The groove 121 can be used to accommodate the sealing strip 4. After the sealing strip 4 is installed in the groove 121, when multiple battery packs 100 are stacked along the second direction, the bottom surface of the bottom plate 13 of the upper battery pack 100 will press the sealing strip 4, thereby achieving sealing between the multiple layers of battery packs 100, preventing external dust from entering the box body 1 and affecting the safety of the battery pack 100.

[0065] like Figures 3 to 5 As shown, in some embodiments, the first mounting frame 22 includes a first support plate 221, a first support member 222 and a second support member 223. The first support plate 221 is provided with a first cooling channel for circulating a coolant. The first support member 222 and the second support member 223 are installed on the first support plate 221 at intervals along a third direction. The second support member 223 is arranged between the two first support members 222. The first battery cell 21 is arranged between the first support member 222 and the second support member 223. The first support plate 221 is used to support the first battery cell 21.

[0066] The first support plate 221 has both supporting and cooling functions, and can effectively reduce the temperature of the first battery cell 21 to prevent the temperature in the box body 1 from being too high to trigger the alarm device.

[0067] The first support member 222 and the second support member 223 can effectively support the second mounting frame 23 on the upper layer and provide separation space for the first battery cells 21 to prevent too many first battery cells 21 from being arranged side by side in the same space and affecting stability.

[0068] In some embodiments, the first mounting frame 22 also includes an annular frame 224, the first support plate 221 is installed in the frame 224, the first support member 222 and the second support member 223 are installed on the frame 224 and are located on the side of the first support plate 221 close to the second mounting frame 23, and a first mounting hole 2241 is provided on the frame 224, and the frame 224 is installed on the box body 1 through the first mounting hole 2241.

[0069] By providing the annular frame 224, a stable bottom support and installation position can be provided for the first support member 222 and the second support member 223. At the same time, it is also convenient to connect the first mounting frame 22 with the bottom plate 13 by providing the first mounting hole 2241 on the frame 224, that is, to connect the first module 2 with the box body 1.

[0070] like Figure 6 As shown, in some embodiments, the second mounting frame 23 includes a second support plate 231, a third support member 232 and a fourth support member 233, the second support plate 231 is provided with a second cooling channel for circulating coolant, the third support member 232 and the fourth support member 233 are installed on the second support plate 231 along a third direction at intervals, the fourth support member 233 is arranged between the two third support members 232, the second battery cell is arranged between the third support member 232 and the fourth support member 233, the second support plate 231 is used to support the second battery cell, the first support member 222 is provided with a second mounting hole 2221, the third support member 232 is provided with a third mounting hole 2321, the first module 2 includes a first connecting member, the first connecting member passes through the third mounting hole 2321 and is inserted into the second mounting hole 2221 to connect the first support member 222 and the third support member 232.

[0071] The second support plate 231 has both supporting and cooling functions, which can effectively reduce the temperature of the second battery cell and prevent the temperature in the box body 1 from being too high to trigger the alarm device.

[0072] The third support member 232 and the fourth support member 233 can effectively support the components on the upper layer of the second mounting frame 23 and provide separation space for the second battery cells to prevent too many second battery cells from being arranged side by side in the same space and affecting stability.

[0073] By setting a second mounting hole 2221 on the first support member 222 and a third mounting hole 2321 on the third support member 232, the first connecting member can pass through the third mounting hole 2321 and be inserted into the second mounting hole 2221 to achieve connection between the first support member 222 and the third support member 232, thereby achieving connection between the first mounting frame 22 and the second mounting frame 23.

[0074] Among them, the first support member 222, the second support member 223, the third support member 232 and the fourth support member 233 all extend along the second direction, the third mounting hole 2321 can be a through hole, the second mounting hole 2221 can be a blind hole, and the axial length of the second mounting hole 2221 can meet the connection requirements of the first connecting member.

[0075] The second support member 223 and the fourth support member 233 are located in the middle of the first mounting frame 22 and the second mounting frame 23. In order to reduce the number of openings on the first support plate 221 and the second support plate 231 and affect the arrangement of cooling channels in the first support plate 221 and the second support plate 231, mounting holes may not be provided on the second support member 223 and the fourth support member 233. The second support member 223 and the fourth support member 233 have a supporting function, but do not have the function of connecting the first mounting frame 22 and the second mounting frame 23.

[0076] In some embodiments, the second mounting frame 23 further includes two connecting plates 234 , the connecting plates 234 are perpendicular to the second support plate 231 , and the second support plate 231 , the third support member 232 and the fourth support member 233 are all welded and connected between the two connecting plates 234 .

[0077] The second support plate 231, the third support member 232 and the fourth support member 233 can be welded together by providing the connecting plate 234. At the same time, the connecting plate 234 is perpendicular to the second support plate 231, and the connecting plate 234 can also play a limiting role in the first direction to prevent the first battery cell 21 or other components from moving relative to each other along the first direction, thereby affecting stability.

[0078] In some embodiments, the frame 224 includes a first frame 2242 and a second frame 2243 extending in a direction perpendicular to the first direction and arranged opposite to each other, and the distance between the first mounting hole 2241 set on the first frame 2242 and the first mounting hole 2241 set on the second frame 2243 is greater than the width between the two connecting plates 234.

[0079] By setting the distance between the first mounting hole 2241 arranged on the first frame 2242 and the first mounting hole 2241 arranged on the second frame 2243 to be greater than the width between the two connecting plates 234, the bottom width of the second mounting frame 23 located above can be made smaller than the width of the connection position between the first mounting frame 22 located below and the bottom plate 13, thereby facilitating the insertion of tools from above to achieve the connection and fixation of the first module 2 and the box body 1, providing operating space for the connection of the first module 2 and the box body 1, improving the convenience of operation, and avoiding the large size of the upper layer affecting the connection of the lower layer.

[0080] In some embodiments, the first module 2 further includes a support frame 24 , which is connected between the first support plate 221 and the second support plate 231 , and is located on the sides of the first support plate 221 and the second support plate 231 .

[0081] By arranging a support frame 24 on the sides of the first support plate 221 and the second support plate 231, the supporting effect between the first mounting frame 22 and the second mounting frame 23 can be strengthened from the side on the basis that the first support member 222, the second support member 223, the third support member 232 and the fourth support member 233 support within the overlapping range of the first support plate 221 and the second support plate 231.

[0082] There are many options for the specific structure of the support frame 24.

[0083] like Figure 7 As shown, in some embodiments, an ear plate 235 is provided on the side of the second mounting frame 23, a fourth mounting hole 2351 is provided on the ear plate 235, a fifth mounting hole 241 and a sixth mounting hole 242 are provided on the support frame 24, the first module 2 also includes a second connecting member and a third connecting member, the second connecting member passes through the fourth mounting hole 2351 and the fifth mounting hole 241 to connect the second mounting frame 23 and the support frame 24, and the third connecting member passes through the sixth mounting hole 242 and the first mounting hole 2241 to connect the first mounting frame 22 and the support frame 24.

[0084] By providing the ear plate 235 on the side of the second mounting frame 23 , it is possible to avoid the cooling channel in the second support plate 231 being affected by the connection between the second mounting frame 23 and the support frame 24 .

[0085] The first mounting hole 2241 provided on the frame 224 of the first mounting frame 22 can be used to realize the connection between the first mounting frame 22 and the box body 1, and can also be used to realize the connection between the first mounting frame 22 and the support frame 24. Moreover, the connection between the first mounting frame 22 and the support frame 24 does not delay the connection between the first mounting frame 22 and the box body 1, and the connecting member can pass through the sixth mounting hole 242, the first mounting hole 2241 and the first connecting hole 1311 in sequence to realize the connection between the support frame 24, the first mounting frame 22 and the box body 1.

[0086] like Figure 8 As shown, in some embodiments, the first module 2 also includes a first protective cover 25, which is U-shaped and made of insulating material. The first protective cover 25 is mounted on the outside of the first mounting frame 22 and the second mounting frame 23 to cover the side of the second mounting frame 23 away from the first mounting frame 22 and the two side surfaces of the first mounting frame 22 and the second mounting frame 23.

[0087] By providing the first protective cover 25, the side of the second mounting frame 23 away from the first mounting frame 22 and the two sides of the first mounting frame 22 and the second mounting frame 23 can be protected to prevent dust or other foreign matter from falling into the first mounting frame 22 and the second mounting frame 23 and affecting the safety of the first battery cell 21.

[0088] In addition, the first protective cover 25 is made of insulating material and has an insulating effect. By providing the insulating first protective cover 25, the first module 2 can have an independent insulating space, the insulation performance is enhanced, and it is not easy to cause voltage breakdown and short circuit.

[0089] In some embodiments, there is a gap between the inner wall of the first protective cover 25 and the first battery cell 21, and the gap forms a smoke exhaust channel for gas circulation. By providing the smoke exhaust channel, the gas in the first module 2 can reach the explosion-proof valve provided on the side of the first module 2 through the smoke exhaust channel, triggering an alarm to prevent excessive pressure inside the first module 2.

[0090] like Fig. 9 As shown, based on the battery packs in the above-mentioned embodiments, the present disclosure further proposes a power battery, which includes a plurality of the above-mentioned battery packs 100 , and the plurality of battery packs 100 are stacked along the second direction.

[0091] Based on the battery packs or power batteries in the above-mentioned embodiments, the present disclosure also proposes an engineering machinery vehicle, which includes the above-mentioned battery packs or power batteries.

[0092] The positive technical effects of the battery pack in the above-mentioned embodiments are also applicable to power batteries and engineering machinery vehicles, and will not be elaborated here.

[0093] The following is combined with Figures 1 to 9 , the structure of an embodiment of the battery pack provided by the present disclosure is described:

[0094] like Figure 1 As shown, the battery pack 100 includes a box body 1, a first module 2, a second module 3, a sealing strip 4, an explosion-proof valve 5, a high-voltage output connector 6, a communication connector 7, a manual maintenance switch 8, a first water nozzle 9 and a maintenance panel 10.

[0095] The box body 1 is in a hexahedral shape. Insulation cotton is pasted on the outer periphery of the box body 1. The first module 2 and the second module 3 are arranged side by side inside the box body 1 at intervals along the first direction x (i.e., the length direction of the box body 1). The height direction of the box body 1 is the second direction y, and the width direction of the box body 1 is the third direction z. The first direction x, the second direction y and the third direction z are perpendicular to each other.

[0096] A sealing strip 4 is pasted on the top of the box body 1, and an explosion-proof valve 5, a high-voltage output connector 6 (including a positive and negative pair), a communication connector 7, a manual maintenance switch 8, a first water nozzle 9 (including an inlet and outlet pair) and a maintenance plate 10 are installed on the front.

[0097] like Figure 2 As shown, a rectangular accommodating cavity 11 is provided inside the box body 1. The box body 1 includes a box body body 12, a bottom plate 13, a flange 14 and ribs 15. The box body body 12 is annular, including two front and rear side plates and two left and right side plates, and the top and bottom surfaces of the box body body 12 are open. The inner circle of the box body body 12 is the accommodating cavity 11.

[0098] The bottom plate 13 is closed to the bottom surface of the box body 12. The area of ​​the bottom plate 13 is larger than the area of ​​the bottom opening of the box body 12. The bottom plate 13 includes a main body 131 located inside the accommodating cavity 11 and an extension portion 132 located outside the accommodating cavity 11. The main body 131 includes a first support portion 1313 and a second support portion 1314. The first support portion 1313 is in a strip shape, and the second support portion 1314 is in a square shape. The thickness of the first support portion 1313 is greater than the thickness of the second support portion 1314, and the first connection hole 1311 and the second connection hole 1312 are provided in the first support portion 1313.

[0099] Specifically, the main body 131 includes three first support portions 1313 extending along the third direction z and four first support portions 1313 extending along the first direction x. Among them, two first support portions 1313 extending along the third direction z and two first support portions 1313 extending along the first direction x are connected to form an annular structure, and one first support portion 1313 extending along the third direction z and two first support portions 1313 extending along the first direction x are cross-arranged inside the annular structure. The first support portions 1313 extending along the third direction z located on both sides are respectively provided with a row of holes, namely, the first connection holes 1311 and the second connection holes 1312, and the first support portion 1313 extending along the third direction z located in the middle is provided with two rows of holes, one row is the first connection holes 1311, and the other row is the second connection holes 1312.

[0100] The extension portion 132 is in a square ring shape and is provided with a plurality of third connection holes 1321 .

[0101] An annular flange 14 is provided on the top of the box body 12. The flange 14 is located on the outer periphery of the accommodating cavity 11, and the flange 14 is parallel to the extension portion 132. A fourth connection hole 141 is provided on the flange 14. A groove 121 is also provided on the top surface of the box body 12. The sealing strip 4 is installed in the groove 121. When multiple battery packs 100 are stacked along the second direction y, the bottom surface of the bottom plate 13 of the upper battery pack 100 can press the sealing strip 4 to achieve sealing of the box body 1. Moreover, the extension portion 132 of the upper battery pack 100 and the flange 14 of the lower battery pack 100 are aligned, and the connection and fixation of the two battery packs 100 can be achieved through the third connection hole 1321 and the fourth connection hole 141.

[0102] A plurality of ribs 15 are also provided on the outer side of the box body 12. By adding the ribs 15, the overall structural strength of the box body 1 can be enhanced.

[0103] like Figure 3 and Figure 4 As shown, the first module 2 includes a first battery cell 21, a first mounting frame 22, a second mounting frame 23, a support frame 24, a protective cover 25, insulation cotton 26, a first copper bar 271, a second copper bar 272, a first aluminum bar 273, a lifting ring 28, a pipe joint 291, a fuse 292 and a BMS connecting plate 293.

[0104] The first mounting rack 22 and the second mounting rack 23 are arranged in upper and lower layers along the second direction y, a plurality of first battery cells 21 are arranged side by side on the first mounting rack 22 along the third direction z, and a plurality of first battery cells 21 are arranged side by side on the second mounting rack 23 along the third direction z.

[0105] The support frame 24 is connected to the side of the first support plate 221 and the second support plate 231. The first protective cover 25 is U-shaped, and the first protective cover 25 is mounted on the outside of the first mounting frame 22 and the second mounting frame 23, and covers the side of the second mounting frame 23 away from the first mounting frame 22 and the two side surfaces of the first mounting frame 22 and the second mounting frame 23. There is a gap between the inner wall of the first protective cover 25 and the first battery cell 21, and the gap forms a smoke exhaust channel for gas circulation. Through holes are provided on both sides of the first protective cover 25 for avoiding the support frame 24. The outer side of the first protective cover 25 is provided with thermal insulation cotton 26.

[0106] Two adjacent first battery cells 21 in the first mounting frame 22 and the second mounting frame 23 are connected in series via the first copper bar 271 and the second copper bar 272. The first battery cells 21 in the first mounting frame 22 and the first battery cells 21 in the second mounting frame 23 are connected in series via the first aluminum bar 273.

[0107] The hoisting ring 28 is provided at the end of the first mounting frame 22 for hoisting the first module 2. The end of the first module 2 is also provided with a pipe joint 291, a fuse 292 and a BMS connection plate 293.

[0108] like Figure 5 As shown, the first mounting frame 22 includes a first supporting plate 221 , a first supporting member 222 , a second supporting member 223 , a frame 224 , a second water nozzle 225 and a lifting sleeve 226 .

[0109] The frame 224 is in a square ring shape, and the first support plate 221 is connected to the inner circle of the frame 224. A first cooling channel for circulating coolant is provided in the first support plate 221. Two second water nozzles 225 are provided at the end of the first support plate 221 for the entry and exit of coolant. Two first support members 222 and one second support member 223 are installed on the frame 224 at intervals along the third direction z, and are located above the first support plate 221. The second support member 223 is arranged between the two first support members 222, and the first battery cell 21 is arranged between the first support member 222 and the second support member 223. The first support plate 221 is used to support the first battery cell 21. The first support member 222 is provided with a second mounting hole 2221.

[0110] The frame 224 includes a first frame 2242 and a second frame 2243 extending along the third direction z and arranged opposite to each other, and the first frame 2242 and the second frame 2243 are both provided with a first mounting hole 2241, and the distance between the first mounting hole 2241 provided on the first frame 2242 and the first mounting hole 2241 provided on the second frame 2243 is greater than the width between the two connecting plates 234. The frame 224 is mounted on the box body 1 through the first mounting hole 2241.

[0111] A lifting sleeve 226 is provided at the end of the frame 224 , and the lifting ring 28 can be installed at the lifting sleeve 226 .

[0112] like Figure 4 and Figure 6 As shown, the second mounting frame 23 includes a second supporting plate 231 , a third supporting member 232 , a fourth supporting member 233 , a connecting plate 234 , an ear plate 235 , a third water nozzle 236 and a third supporting plate 237 .

[0113] A second cooling channel for circulating coolant is provided in the second support plate 231. Two third support members 232 and one fourth support member 233 are installed on the second support plate 231 along the third direction z at intervals, the fourth support member 233 is disposed between the two third support members 232, the first battery cell 21 is disposed between the third support member 232 and the fourth support member 233, and the second support plate 231 is used to support the first battery cell 21.

[0114] The first support member 222 is provided with a second mounting hole 2221 , the third support member 232 is provided with a third mounting hole 2321 , and the first connecting member passes through the third mounting hole 2321 and is inserted into the second mounting hole 2221 to connect the first support member 222 and the third support member 232 .

[0115] The two connecting plates 234 are respectively connected to both sides of the second support plate 231. The connecting plates 234 extend in the third direction z and are perpendicular to the second support plate 231. The connecting plates 234 weld the second support plate 231, the third support member 232 and the fourth support member 233 together.

[0116] The ear plate 235 is disposed on a side surface of the second mounting frame 23 , and a fourth mounting hole 2351 is defined on the ear plate 235 .

[0117] Two third water nozzles 236 are provided at the end of the third support member 232 for the coolant to flow in and out. A third support plate 237 is provided on the top of the second mounting frame 23, and a third cooling channel for the coolant to flow is provided in the third support plate 237.

[0118] like Figure 7 As shown, the support frame 24 is a frame structure. The support frame 24 includes two horizontal plates 244 extending along the third direction z, three vertical plates 243 extending along the second direction y, and two side plates 245 arranged on the side. The two horizontal plates 244, the three vertical plates 243 and the two side plates 245 are connected to form a Japanese-shaped structure.

[0119] A fifth mounting hole 241 and a sixth mounting hole 242 are respectively provided on the two transverse plates 244 . The second connecting member passes through the fourth mounting hole 2351 and the fifth mounting hole 241 to connect the second mounting frame 23 and the support frame 24 . The third connecting member passes through the sixth mounting hole 242 and the first mounting hole 2241 to connect the first mounting frame 22 and the support frame 24 .

[0120] like Figure 8 As shown, the first protective cover 25 is a U-shaped structure, and the first protective cover 25 is buckled on the top of the second mounting frame 23. The side plate of the first protective cover 25 is provided with a bending portion, and the bending portion is provided with a seventh mounting hole 251. Through the seventh mounting hole 251, the first protective cover 25 can be connected to the frame 224 of the first mounting frame 22. There is a gap between the inner wall of the first protective cover 25 and the first battery cell 21, forming a smoke exhaust channel. If a battery cell has thermal runaway, its smoke will flow along the smoke exhaust channel to the explosion-proof valve 5 at the front of the box.

[0121] The second module 3 includes a plurality of second battery cells, a third mounting frame and a fourth mounting frame, the third mounting frame and the fourth mounting frame are arranged side by side along the second direction, a portion of the plurality of second battery cells are arranged side by side on the third mounting frame along the third direction, and another portion of the plurality of second battery cells are arranged side by side on the fourth mounting frame along the third direction.

[0122] The other structures of the second module 3 may be the same as those of the first module 2 and will not be described in detail here.

[0123] The assembly process of the first module 2 and the second module 3 is as follows:

[0124] First, fix the first mounting frame 22 on the production line and directly stack the first battery cells 21 of the lower layer; then lay the second mounting frame 23 on the top of the first mounting frame 22 to stack the first battery cells 21 of the upper layer; then lay the third support plate 237 on the top of the second mounting frame 23; then realize the series connection between the first battery cells 21 of the same layer through the first copper busbar 271, and realize the series connection between the upper and lower layers of the first battery cells 21 through the second copper busbar 272, and then install the first aluminum busbar 273, pipe joint 291, fuse 292, BMS connection plate 293 and wiring harness, etc.; then install the insulating first protective cover 25 with thermal insulation cotton 26 on the frame 224 of the first mounting frame 22, and the assembly of a single first module 2 is completed.

[0125] When hoisting into the box body 1, first install the six left and right hoisting components on the frame 224 of the first mounting frame 22, use a special hoisting tool to connect the six hoisting components with a hoisting rope, hoist the first module 2 into the box body 1, and screw the bolts into the first mounting hole 2241 on the frame 224 of the first mounting frame 22 and the first connecting hole 1311 on the main body 131 of the box body 1, and then remove the fixing bolts of the hoisting components.

[0126] The structural composition and assembly and installation process of the second module 3 are basically the same as those of the first module 2 .

[0127] After the two modules are put into the box, the inter-module pipe lines, the box connectors, and the copper busbar lines are installed. Finally, the battery pack is assembled.

[0128] like Fig. 9As shown, multiple battery packs 100 can be stacked up and down along the second direction y to form a power battery. According to the power required by the battery system, a suitable number of battery packs are selected and stacked directly up and down, and the extension 132 of the upper battery pack and the connection holes corresponding to the convex edge 14 of the lower battery pack are fastened by bolts, and the battery box cover is installed on the top to form a battery system. Since a single battery pack can meet the voltage platform requirements of the entire vehicle, the assembled battery packs can be connected in parallel. If a battery pack fails, the battery pack can be shielded without affecting the use of the remaining battery packs.

[0129] The battery pack embodiment provided by the present disclosure simplifies the assembly process of the battery pack by dividing the battery pack into two independently installed battery modules. After assembly, the individual modules can be hoisted into the box separately. The independent module design improves the assembly process of the battery pack. Through the reliability scheme design of the single module double-layer battery cell, a larger number of battery cells can be arranged under a certain external size of the battery pack. A single battery pack can be arranged with more than or equal to 250 battery cells, which increases the rated voltage (greater than or equal to 800V) and power of a single battery pack. A single battery pack can meet the requirements of the high-voltage platform of the whole vehicle greater than or equal to 800V. When a battery pack fails, it can be temporarily shielded, and the remaining battery packs provide the power requirements of the whole vehicle.

[0130] The battery pack embodiment provided by the present disclosure improves the assembly process of the battery pack by dividing the battery pack into two independently installed battery modules within a single battery pack. Each independent battery module is installed with an insulating protective cover to reduce the voltage of each module and reduce the risk of ultra-high voltage. The insulating protective cover also serves as a protection and internal smoke exhaust channel in the single battery pack state to prevent dust and falling objects from falling into the battery pack and damaging the cold plate and battery cells. The channel formed by the inner side of the insulating protective cover and the side of the battery cell pole can realize the diversion of smoke in the forward and backward directions when the battery cell thermal runaways. The outside of the insulating protective cover is affixed with insulating foam to form a double-layer thermal insulation protection with the insulating foam outside the box.

[0131] In the battery pack embodiment provided by the present disclosure, a single module blade cell is fixed with a low frame, and the upper and lower layer cells can be directly stacked from the lower layer to the upper layer for connecting plate welding, without the need for flipping or lifting equipment and tooling, and the process is simple and reliable.

[0132] In the battery pack embodiment provided by the present disclosure, a single module is fixed to the bottom of the box with a low frame, and the cell end plate of the middle frame supported by the upper cell of the double-layer cell is welded to the cold plate. Compared with the traditional direct connection by upper and lower bolts, the structural strength is higher, and the left and right connecting plates form a welded reinforced structure with the front, middle and rear end plates and the middle cold plate. The lower cold plate of the upper cell adopts an aluminum extrusion profile solution, which can support the upper cell and is connected by long bolts running through the first and second layers. In order to enhance the reliability of the two-layer cold plate, mounting ear plates extend from the left and right sides of the cold plate, and auxiliary support is achieved through upper and lower support beams.

[0133] In the battery pack embodiment provided by the present disclosure, the external load-bearing cast steel box body can realize direct stacking of multiple layers of battery packs. Compared with aluminum, cast steel has high structural strength and hardness, and can replace the rectangular tube frame outside the battery system to directly bear the weight of the battery system, saving the complex connection brackets and pipe lines outside the battery system. The front of the box body is provided with a maintenance port to facilitate fault inspection and fuse replacement of a single battery pack in the entire stacked battery pack system.

[0134] Compared with the traditional battery system composed of dozens of standard boxes in series-parallel connection, the battery pack embodiment provided by the present invention has a simple system solution and high reliability, and can better meet the solution requirements of ultra-high voltage and large-capacity battery systems for large-scale engineering machinery.

[0135] In addition, for companies that already have large-scale flipping equipment and tooling, they do not need to use a solution of lifting and loading into boxes with independent double rows on the left and right. The single-layer left and right rows of battery cells share an aluminum pallet. The left and right rows are flipped and stacked on separate tooling for welding of the aluminum rows, and then the pallet is flipped and turned upside down on the battery cells.

[0136] The battery pack can also be arranged with square shell cells with the poles at the top. In this case, the square shell cells need to be formed into modules through end plates, rolling strips or left and right clamps, and then fixed on the upper and lower cold plates.

[0137] The double-layer battery cell arrangement of a single module disclosed in the present invention is used to increase the number of series-connected battery cells in a single battery pack. If the length and width of the battery of the whole machine are not strictly required, a single-layer battery cell arrangement solution can also be adopted, so that the length or width of the battery pack needs to be doubled. A three-layer battery cell arrangement solution can also be adopted, but the structural arrangement strength of the three-layer battery cell is more difficult and risky.

[0138] The above description of various embodiments tends to emphasize the differences between the various embodiments. The same or similar aspects can be referenced to each other, and for the sake of brevity, they will not be repeated herein.

[0139] Those skilled in the art will appreciate that, in the above method of a specific embodiment, the order in which the steps are written does not imply a strict execution order and does not constitute any limitation on the implementation process. The specific execution order of the steps should be determined by their functions and possible internal logic.

[0140] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present disclosure rather than to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, ordinary technicians in the relevant field should understand that without departing from the principles of the present disclosure, the specific implementation methods of the present disclosure can still be modified or some technical features can be replaced by equivalents, and these modifications and equivalent replacements should be included in the scope of the technical solution for protection of the present disclosure.

Claims

1. A battery pack (100), characterized in that: include: The box body (1) has a receiving cavity (11); The first module (2) and the second module (3) are arranged side by side in the accommodating cavity (11) along a first direction; The first module (2) comprises a plurality of first battery cells (21), a first mounting frame (22) and a second mounting frame (23); the first mounting frame (22) and the second mounting frame (23) are arranged side by side along a second direction; a portion of the plurality of first battery cells (21) are arranged side by side on the first mounting frame (22) along a third direction; another portion of the plurality of first battery cells (21) are arranged side by side on the second mounting frame (23) along the third direction; and any two of the first direction, the second direction and the third direction are perpendicular; The second module (3) comprises a plurality of second battery cells, a third mounting frame and a fourth mounting frame, wherein the third mounting frame and the fourth mounting frame are arranged side by side along the second direction, a portion of the plurality of second battery cells are arranged side by side on the third mounting frame along the third direction, and another portion of the plurality of second battery cells are arranged side by side on the fourth mounting frame along the third direction.

2. The battery pack (100) according to claim 1, characterized in that: The box body (1) comprises a box body main body (12) having openings at both ends and in an annular shape, and a bottom plate (13) for closing the opening at one end of the box body main body (12); the box body main body (12) and the bottom plate (13) surround and form the accommodating cavity (11); the bottom plate (13) comprises a main body portion (131) located in the accommodating cavity (11); the main body portion (131) is provided with a first connecting hole (1311) and a second connecting hole (1312); the first mounting frame (22) is mounted on the bottom plate (13) through the first connecting hole (1311); and the third mounting frame is mounted on the bottom plate (13) through the second connecting hole (1312).

3. The battery pack (100) according to claim 2, characterized in that: The main body (131) comprises a first support portion (1313) and a second support portion (1314) connected to the first support portion (1313), the thickness of the first support portion (1313) is greater than the thickness of the second support portion (1314), and the first connection hole (1311) and the second connection hole (1312) are arranged on the first support portion (1313).

4. The battery pack (100) according to claim 2, characterized in that: The bottom plate (13) comprises an extension portion (132) located outside the accommodating cavity (11), the extension portion (132) being provided with a third connection hole (1321), the box body (1) further comprising a convex edge (14) arranged at an end of the box body main body (12) away from the bottom plate (13), the convex edge (14) being annular and arranged outside the accommodating cavity (11), the convex edge (14) being parallel to the extension portion (132), and the convex edge (14) being provided with a fourth connection hole (141).

5. The battery pack (100) according to claim 2, characterized in that: It also comprises a sealing strip (4); an end of the box body (12) away from the bottom plate (13) is provided with a groove (121), and the sealing strip (4) is installed in the groove (121).

6. The battery pack (100) according to claim 1, characterized in that: The first mounting frame (22) comprises a first support plate (221), a first support member (222) and a second support member (223); a first cooling channel for circulating a cooling liquid is provided in the first support plate (221); the first support member (222) and the second support member (223) are installed on the first support plate (221) at intervals along the third direction; the second support member (223) is arranged between the two first support members (222); the first battery cell (21) is arranged between the first support member (222) and the second support member (223); and the first support plate (221) is used to support the first battery cell (21).

7. The battery pack (100) according to claim 6, characterized in that: The first mounting frame (22) further comprises an annular frame (224), the first support plate (221) being mounted in the frame (224), the first support member (222) and the second support member (223) being mounted on the frame (224) and being located on a side of the first support plate (221) close to the second mounting frame (23), the frame (224) being provided with a first mounting hole (2241), and the frame (224) being mounted on the box body (1) through the first mounting hole (2241).

8. The battery pack (100) according to claim 7, characterized in that: The second mounting frame (23) comprises a second support plate (231), a third support member (232) and a fourth support member (233); the second support plate (231) is provided with a second cooling channel for circulating a coolant; the third support member (232) and the fourth support member (233) are installed on the second support plate (231) at intervals along the third direction; the fourth support member (233) is arranged between the two third support members (232); the first battery cell (21) is arranged on the third support member (23 2) and the fourth support member (233), the second support plate (231) is used to support the first battery cell (21), the first support member (222) is provided with a second mounting hole (2221), the third support member (232) is provided with a third mounting hole (2321), the first module (2) comprises a first connecting member, the first connecting member passes through the third mounting hole (2321) and is inserted into the second mounting hole (2221) to connect the first support member (222) and the third support member (232).

9. The battery pack (100) according to claim 8, characterized in that: The second mounting frame (23) further comprises two connecting plates (234), the connecting plates (234) being perpendicular to the second supporting plate (231), and the second supporting plate (231), the third supporting member (232) and the fourth supporting member (233) are all welded and connected between the two connecting plates (234).

10. The battery pack (100) according to claim 9, characterized in that: The frame (224) comprises a first frame (2242) and a second frame (2243) which extend in a direction perpendicular to the first direction and are arranged opposite to each other, and the distance between the first mounting hole (2241) provided on the first frame (2242) and the first mounting hole (2241) provided on the second frame (2243) is greater than the width between the two connecting plates (234).

11. The battery pack (100) according to claim 8, characterized in that: The first module (2) further comprises a support frame (24), wherein the support frame (24) is connected between the first support plate (221) and the second support plate (231), and the support frame (24) is located on the sides of the first support plate (221) and the second support plate (231).

12. The battery pack (100) according to claim 11, characterized in that: The second mounting frame (23) is provided with an ear plate (235) on the side thereof, and a fourth mounting hole (2351) is provided on the ear plate (235); the support frame (24) is provided with a fifth mounting hole (241) and a sixth mounting hole (242); the first module (2) further comprises a second connecting member and a third connecting member, the second connecting member passing through the fourth mounting hole (2351) and the fifth mounting hole (241) to connect the second mounting frame (23) and the support frame (24); the third connecting member passing through the sixth mounting hole (242) and the first mounting hole (2241) to connect the first mounting frame (22) and the support frame (24).

13. The battery pack (100) according to claim 1, characterized in that: The first module (2) further comprises a first protective cover (25), the first protective cover (25) being U-shaped and made of insulating material, the first protective cover (25) being sleeved on the outside of the first mounting frame (22) and the second mounting frame (23) so as to cover the side of the second mounting frame (23) away from the first mounting frame (22) and the two side surfaces of the first mounting frame (22) and the second mounting frame (23).

14. The battery pack (100) according to claim 13, characterized in that: There is a gap between the inner wall of the first protective cover (25) and the first battery cell (21), and the gap forms a smoke exhaust channel for gas to flow.

15. A power battery, characterized in that: Comprising a plurality of battery packs (100) according to any one of claims 1 to 14, wherein the plurality of battery packs (100) are stacked along the second direction.

16. An engineering machinery vehicle, characterized in that: Comprising a battery pack (100) as claimed in any one of claims 1 to 14, or comprising a power battery as claimed in claim 15.

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