Battery pack and electric device

Abstract

The present application relates to the technical field of batteries. Disclosed are a battery pack and an electric device. The battery pack comprises a base plate assembly, a frame and a cover, wherein a gas collection cavity is formed in the base plate assembly; the frame comprises a first side beam having a gas exhaust channel; the first side beam comprises a first beam body, a gas exhaust seat and a first reinforcing structure, the first beam body having a first end portion and a second end portion opposite each other, the first end portion facing an accommodating space and having a first weight reduction groove, and the gas exhaust seat being disposed in the first weight reduction groove; the first reinforcing structure is disposed in the first weight reduction groove and connected to the first beam body; and the gas exhaust channel runs through the gas exhaust seat and the first beam body and is in communication with the gas collection cavity. Since the gas exhaust channel in the first side beam is located in the gas exhaust seat, and the first reinforcing structure is arranged in the area of the first weight reduction groove excluding the gas exhaust seat, the first side beam has a certain strength, and the battery pack has a relatively good impact resistance.

Description

Battery pack and electric device

[0001] Cross-reference to related applications

[0002] This application claims the benefit of Chinese Patent Application No. 202411399353.3, filed September 30, 2024, and Chinese Patent Application No. 202422415233.X, filed September 30, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a battery pack and an electric device. BACKGROUND

[0004] The battery pack includes a box body and battery cells arranged in the box body. Under the action of stress and thermal stimulation, the battery cells in the battery pack can short circuit, thereby causing the battery cells to burst and spray. When the battery cells burst and spray, a large amount of mixture, including high-temperature molten substances, is sprayed out of the valve port of the battery cells, and a large amount of high-temperature gas is generated. In the related art, the frame of the box body has an exhaust passage. The high-temperature gas is discharged to the outside of the battery pack through the exhaust passage, so as to avoid the accumulation of the high-temperature gas in the box body and cause safety problems. However, the strength of the frame affects the impact resistance of the battery pack. Therefore, the frame provided with the exhaust passage needs to have relatively high strength to enable the battery pack to have relatively good impact resistance. SUMMARY

[0005] The primary object of the present application is to provide a battery pack with relatively good impact resistance.

[0006] To achieve the above object, the present application provides a battery pack having a first direction and a second direction perpendicular to each other, comprising a bottom plate assembly, a frame and a cover body.

[0007] In the first direction, the bottom plate assembly and the cover body are connected to both ends of the frame, respectively, and the bottom plate assembly, the frame and the cover body enclose an accommodation space.

[0008] The bottom plate assembly forms a gas collection cavity.

[0009] The frame includes a first edge beam, and the first edge beam has an exhaust passage.

[0010] The first edge beam includes a first beam body, an exhaust seat and a first reinforcing structure.

[0011] In the second direction, the first beam body has opposite first and second end portions, the first end portion faces the accommodation space, and the first end portion has a first weight-reducing groove, the depth direction of the first weight-reducing groove is the same as the second direction.

[0012] The exhaust seat is arranged in the first lightening groove and connected to the first beam body;

[0013] The first reinforcing structure is arranged in the first lightening groove and connected to the first beam body;

[0014] The exhaust passage penetrates the exhaust seat and the first beam body in the second direction, and the exhaust passage communicates with the gas collection cavity.

[0015] In a specific embodiment of the present application, in the second direction, the orthogonal projection of the exhaust seat on the end face of the second end portion is a first projection;

[0016] The second end portion has a second lightening groove, the depth direction of the second lightening groove is the same as the second direction, and the opening of the second lightening groove is completely within the first projection.

[0017] In a specific embodiment of the present application, the first side beam further comprises a mounting seat, the mounting seat is arranged in the second lightening groove and connected to the first beam body;

[0018] The exhaust passage penetrates the exhaust seat, the first beam body and the mounting seat;

[0019] The battery pack further comprises a first explosion-proof valve, the first explosion-proof valve is connected to the mounting seat, and the first explosion-proof valve seals the exhaust passage.

[0020] In a specific embodiment of the present application, the battery pack further has a third direction, the first direction, the second direction and the third direction are orthogonal to each other;

[0021] The first reinforcing structure comprises a first reinforcing rib and a second reinforcing rib;

[0022] The first reinforcing rib is in a strip shape, the extension direction of the first reinforcing rib intersects the first direction, the number of the first reinforcing rib is multiple, and multiple first reinforcing ribs are arranged at intervals along the first direction;

[0023] The second reinforcing rib is in a strip shape, the extension direction of the second reinforcing rib intersects the third direction, the number of the second reinforcing rib is multiple, and multiple second reinforcing ribs are arranged at intervals along the third direction, and one second reinforcing rib is arranged to intersect at least part of the first reinforcing rib.

[0024] In a specific embodiment of the present application, the frame further comprises a second side beam, the first side beam and the second side beam are arranged at intervals along the second direction;

[0025] The second side beam comprises a second beam body and a second reinforcing structure;

[0026] In the second direction, the second beam body has opposite third and fourth end portions, the third end portion facing the accommodation space;

[0027] The fourth end portion has a third lightening groove, the depth direction of the third lightening groove being the same as the second direction;

[0028] The second reinforcing structure is arranged in the third lightening groove and connected with the second beam body.

[0029] In one specific embodiment of the present application, the battery pack further has a third direction, the first direction, the second direction and the third direction being orthogonal to each other;

[0030] The battery pack further includes a battery and an adhesive layer;

[0031] The number of the battery is a plurality, and the plurality of batteries are arranged in the accommodation space and arrayed to form a battery group, in the battery group, the plurality of batteries form a plurality of rows in the second direction and a plurality of columns in the third direction;

[0032] In the second direction, the battery group has opposite first and second wall surfaces;

[0033] The first wall surface faces the first end portion, the first wall surface being arranged at a distance from the first end portion, and an installation space being formed between the first wall surface and the first end portion;

[0034] The second wall surface faces the third end portion, and the second wall surface is connected with the third end portion through the adhesive layer.

[0035] In one specific embodiment of the present application, the second reinforcing structure includes third and fourth reinforcing ribs;

[0036] The third reinforcing rib is in a strip shape, the extension direction of the third reinforcing rib intersecting the first direction, the number of the third reinforcing rib being a plurality, and the plurality of third reinforcing ribs being arranged at a distance along the first direction;

[0037] The fourth reinforcing rib is in a strip shape, the extension direction of the fourth reinforcing rib intersecting the third direction, the number of the fourth reinforcing rib being a plurality, and the plurality of fourth reinforcing ribs being arranged at a distance along the third direction, and one fourth reinforcing rib intersecting at least part of the third reinforcing rib.

[0038] In a specific embodiment of the present application, the bottom plate assembly comprises a first plate body and a second plate body, the first plate body and the second plate body are connected with the frame, and the first plate body and the second plate body are arranged in the first direction, and the gas collection cavity is formed between the first plate body and the second plate body, wherein the second plate body has a plurality of exhaust holes penetrating in the first direction, and the exhaust holes are communicated with the gas collection cavity.

[0039] The battery comprises a battery body and a second explosion-proof valve, and the second explosion-proof valve is connected with one side of the battery body facing the second plate body.

[0040] One of the second explosion-proof valves faces one of the exhaust holes.

[0041] In a specific embodiment of the present application, the battery pack further comprises a plurality of first spacers, and the first spacers have a weak part.

[0042] The plurality of first spacers are arranged between the battery group and the second plate body, and one of the first spacers corresponds to one of the battery bodies, wherein in the first direction, the two ends of the first spacer are in contact with the battery body and the second plate body respectively, and the exhaust hole, the weak part and the second explosion-proof valve are arranged in the first direction in sequence.

[0043] In a specific embodiment of the present application, the first spacer is provided with a notch, and the notch forms the weak part.

[0044] In a specific embodiment of the present application, the first spacer comprises a first piece, a second piece and a connecting body, the first piece is provided with a mounting hole penetrating in the first direction, the second piece is arranged in the mounting hole, the number of the connecting body is plural, the connecting body is located between the second piece and the first piece, and the connecting body connects the second piece and the first piece, a plurality of the connecting bodies are arranged in the circumferential direction around the second piece, and the second piece and the connecting body form the weak part.

[0045] In a specific embodiment of the present application, the battery pack further comprises a second spacer, in the third direction, two adjacent first spacers are connected through the second spacer, and a plurality of first spacers are arranged in a row.

[0046] In a specific embodiment of the present application, the battery pack further comprises a plurality of first sealing layers, and the plurality of first sealing layers are arranged between the battery group and the second plate body.

[0047] In the second direction, a single first sealing layer is filled between two adjacent rows of first spacers.

[0048] In the first direction, two ends of the first sealing layer are in contact with the second plate body and the battery body respectively.

[0049] In one specific embodiment of the present application, the battery pack further comprises a plurality of second sealing layers and a plurality of partition strips, the plurality of second sealing layers and the plurality of partition strips are arranged between the battery pack and the second plate body;

[0050] The partition strips extend in the third direction, and the plurality of partition strips are arranged at intervals along the second direction;

[0051] The two sides of the single row of first partition strips in the second direction are respectively provided with the partition strips;

[0052] The second sealing layer is an adhesive layer, and the second sealing layer is filled between the partition strips and the single row of first partition strips adjacent thereto and between adjacent two partition strips;

[0053] In the first direction, two ends of the partition strips are connected with the battery body and the second plate body respectively, and two sides of the second sealing layer are connected with the battery body and the second plate body respectively.

[0054] In one specific embodiment of the present application, in the second direction, the length dimension of the first partition strip is greater than the length dimension of the second partition strip.

[0055] In one specific embodiment of the present application, the battery pack further comprises a plurality of third partition strips, the third partition strips are in strip shape, the third partition strips are arranged in the gas collection cavity, and the third partition strips are connected with the first plate body, and the plurality of third partition strips are arranged at intervals along the second direction;

[0056] Among them, one row of second explosion-proof valves faces one third partition strip.

[0057] In one specific embodiment of the present application, the battery pack further comprises an elastic support, the elastic support is arranged in the gas collection cavity, in the first direction, one end of the elastic support is connected with the first plate body and the other end is connected with the second plate body.

[0058] In one specific embodiment of the present application, the elastic support is in strip shape, the elastic support extends in the third direction, the number of the elastic support is a plurality, and at least one elastic support is arranged between adjacent two third partition strips in the second direction.

[0059] In one specific embodiment of the present application, the elastic support comprises a plurality of first support segments and a plurality of second support segments, the plurality of first support segments are arranged at intervals along the third direction, and adjacent two first support segments are connected through one second support segment.

[0060] The first support section is connected with the first plate body, and the second support section is protruded towards the second plate body relative to the first plate body, so that the second support section is connected with the second plate body.

[0061] In a specific embodiment of the present application, the bottom plate assembly further comprises a plurality of bosses arranged in the gas collection cavity, the bosses are connected with the second plate body, the bosses are in strip shape, the bosses extend along the second direction, the bosses are arranged in the third direction, and the bosses and the exhaust holes are arranged alternately in the third direction, and each of the bosses has a first flow channel, and the first flow channels are connected with each other.

[0062] In the third direction, the second support section is arranged between two adjacent bosses.

[0063] In a specific embodiment of the present application, the bosses comprise a plurality of first connecting sections and a plurality of second connecting sections, the first connecting sections are arranged in the second direction, and two adjacent first connecting sections are connected by a second connecting section, and the first flow channels pass through the first connecting sections and the second connecting sections.

[0064] In the second direction, the second connecting sections are arranged between two adjacent first connecting sections, and in the third direction, the second support section is arranged between two adjacent second connecting sections.

[0065] In a specific embodiment of the present application, the second connecting section comprises a first section body, a second section body and a third section body, the first section body is in straight strip shape, the first section body extends in the second direction, the second section body and the third section body are oblique to the third direction, the first section body is connected with the second section body and the third section body at two ends in the second direction, and the first section body is connected with the first connecting section through the second section body and the third section body.

[0066] In a specific embodiment of the present application, the second support section comprises a fourth section body, a fifth section body and a sixth section body, the fourth section body is in straight strip shape, the fourth section body extends in the second direction, the fifth section body and the sixth section body are oblique to the third direction, and the fourth section body is connected with the fifth section body and the sixth section body at two ends in the second direction.

[0067] The first segment body, the second segment body and the third segment body between the two adjacent second connecting segments form a clamping groove, the fourth segment body, the fifth segment body and the sixth segment body of the second support segment are clamped in the clamping groove, the first segment body of one second connecting segment, the fourth segment body and the first segment body of another second connecting segment are arranged along the third direction, the second segment body of one second connecting segment, the fifth segment body and the second segment body of another second connecting segment are arranged along the third direction, and the third segment body of one second connecting segment, the sixth segment body and the third segment body of another second connecting segment are arranged along the third direction.

[0068] In a specific embodiment of the present application, the first support segment has a through hole penetrating in the first direction.

[0069] In a specific embodiment of the present application, the second plate body has a second flow channel.

[0070] In a specific embodiment of the present application, the battery pack further comprises a first sealing ring, a second sealing ring and a third sealing ring.

[0071] The frame has a first mounting surface, a second mounting surface and a third mounting surface arranged around the containing space, the first mounting surface faces the cover body, and the second mounting surface and the third mounting surface both face away from the cover body.

[0072] The first mounting surface is sealingly connected with the cover body through the first sealing ring, the second mounting surface is sealingly connected with the first plate body through the second sealing ring, and the third mounting surface is sealingly connected with the second plate body through the third sealing ring.

[0073] In a specific embodiment of the present application, the frame has an annular first mounting groove, the first mounting groove is located on the first mounting surface, the first mounting groove is arranged around the containing space, the groove wall surface of the first mounting groove extends outwardly and obliquely in the first direction, and the first mounting groove is provided with the first sealing ring.

[0074] In a specific embodiment of the present application, the frame has an annular second mounting groove, the second mounting groove is located on the first mounting surface, the second mounting groove is arranged around the center of the containing space, the groove wall surface of the second mounting groove extends outwardly and obliquely in the first direction, the second mounting groove is provided with the first sealing ring, and the first mounting groove is closer to the containing space than the second mounting groove.

[0075] In a specific embodiment of the present application, the battery further comprises a first fastener connecting the cover and the frame, and the first fastener is located between the first mounting groove and the second mounting groove, wherein the first fastener is in a plurality, and the plurality of first fasteners are arranged around the accommodation space.

[0076] In a specific embodiment of the present application, the second sealing ring has a receiving hole extending in the first direction;

[0077] The battery pack further comprises a distance piece arranged in the receiving hole, and two ends of the distance piece in the first direction are connected with the first plate body and the second mounting surface, respectively.

[0078] In a specific embodiment of the present application, the receiving hole is in a plurality, and the plurality of receiving holes are arranged around the accommodation space;

[0079] The distance piece is in a plurality, and one distance piece is arranged in one receiving hole;

[0080] The distance piece comprises a distance part and a fixing part, the fixing part is fixedly connected with the frame, the distance part is arranged in the receiving hole, and two ends of the distance part in the first direction are connected with the first plate body and the second mounting surface, respectively. One side of the distance part facing the first plate body is provided with a fixing hole, and the fixing hole extends into the fixing part.

[0081] The battery pack further comprises a plurality of second fasteners, and one second fastener is fastened in one fixing hole to connect the first plate body and the frame.

[0082] In a specific embodiment of the present application, the frame has a third mounting groove in the shape of a ring, the third mounting groove is located on the third mounting surface, the third mounting groove is arranged around the accommodation space, a groove wall surface of the third mounting groove extends outwardly and obliquely in the first direction, and the third mounting groove is provided with the third sealing ring.

[0083] In a specific embodiment of the present application, the battery pack further comprises a protective cover, the protective cover has an exhaust groove and an open mouth, the protective cover is connected with the second end part, the protective cover covers the second weight-reducing groove, a groove opening of the exhaust groove faces the second weight-reducing groove, the open mouth is communicated with the exhaust groove, and the open mouth faces the bottom plate assembly in the first direction.

[0084] In a specific embodiment of the present application, the exhaust seat has an exhaust cavity and an air inlet opening, the air inlet opening communicates the gas collecting cavity and the exhaust cavity;

[0085] The second end portion has an air outlet opening on a bottom surface of the second lightening groove, and the air outlet opening is in communication with the exhaust cavity.

[0086] The air inlet opening, the exhaust cavity and the air outlet opening form the exhaust passage.

[0087] Compared with the prior art, the battery pack and the electric equipment have the following beneficial effects:

[0088] The battery pack has the first side beam of the frame with the exhaust passage, and the first side beam includes a first beam body, an exhaust seat and a first reinforcing structure. The first beam body has a first lightening groove, the exhaust seat is connected to a bottom surface of the first lightening groove, the exhaust passage penetrates through the exhaust seat and the first beam body, and the first reinforcing structure is connected to the first beam body and located in the first lightening groove. The first lightening groove can make the frame have the light weight. In addition, the exhaust passage in the first side beam is located in the exhaust seat, and the first reinforcing structure is arranged in the first lightening groove except the area of the exhaust seat. Therefore, the first side beam has a certain strength, and the battery pack has good impact resistance. BRIEF DESCRIPTION OF DRAWINGS

[0089] Fig. 1 is a perspective view of the battery pack according to an embodiment of the present application;

[0090] Fig. 2 is a perspective view of the battery pack according to an embodiment of the present application from another angle;

[0091] Fig. 3 is an enlarged view of A in Fig. 2 according to an embodiment of the present application;

[0092] Fig. 4 is a front view of the first side beam according to an embodiment of the present application;

[0093] Fig. 5 is an enlarged view of B in Fig. 4 according to an embodiment of the present application;

[0094] Fig. 6 is a perspective view of the first side beam according to an embodiment of the present application;

[0095] Fig. 7 is a perspective view of another first side beam according to an embodiment of the present application;

[0096] Fig. 8 is a top view of the battery pack according to an embodiment of the present application without a cover;

[0097] Fig. 9 is an enlarged view of C in Fig. 8 according to an embodiment of the present application;

[0098] Fig. 10 is a top view of the battery pack according to an embodiment of the present application without the cover and a battery pack;

[0099] Fig. 11 is an enlarged view of E in Fig. 10 according to an embodiment of the present application;

[0100] Fig. 12 is a top view of another first spacer according to an embodiment of the present application;

[0101] Fig. 13 is a sectional view along D-D of Fig. 10 according to an embodiment of the present application;

[0102] Fig. 14 is an enlarged view of F of Fig. 13 according to an embodiment of the present application;

[0103] Fig. 15 is an enlarged view of G of Fig. 14 according to an embodiment of the present application;

[0104] Fig. 16 is a schematic view of the cooperation of the frame, the cover, the first sealing ring and the first fastener according to an embodiment of the present application;

[0105] Fig. 17 is a schematic view of the cooperation of the frame, the first plate, the second sealing ring and the second fastener according to an embodiment of the present application;

[0106] Fig. 18 is an exploded schematic view of the cooperation of the frame, the bottom plate assembly, the third spacer and the elastic support according to an embodiment of the present application;

[0107] Fig. 19 is a schematic view of the cooperation of the battery, the bottom plate assembly, the first spacer, the first sealing layer, the third spacer and the elastic support according to an embodiment of the present application;

[0108] Fig. 20 is a perspective view of the elastic support according to an embodiment of the present application;

[0109] Fig. 21 is a bottom view of the second plate according to an embodiment of the present application;

[0110] Fig. 22 is an enlarged view of H of Fig. 21 according to an embodiment of the present application;

[0111] Fig. 23 is a sectional view of another second plate according to an embodiment of the present application;

[0112] Fig. 24 is a sectional view of the first edge beam at the exhaust seat according to an embodiment of the present application.

[0113] Z, first direction; X, second direction; Y, third direction; 10A, accommodating space; 10a, mounting space; 1, bottom plate assembly; 1A, gas collecting cavity; 11, first plate body; 12, second plate body; 12A, exhaust hole; 12B, second flow channel; 13, boss; 13A, first flow channel; 131, first connecting section; 132, second connecting section; 1321, first section body; 1322, second section body; 1323, third section body; 2, frame; 201, first mounting surface; 202, second mounting surface; 203, third mounting surface; 20A, first mounting groove; 20B, second mounting groove; 20C, third mounting groove; 21, first edge beam; 21A, exhaust passage; 21B, first area; 21C, second area; 211, first beam body; 2111, first end portion; 2111A, first lightening groove; 2112, second end portion; 2112A, second lightening groove; 2112B, air outlet opening; 2113, end surface of the second end portion; 212, exhaust seat; 212A, exhaust cavity; 212B, air inlet opening; 213, first reinforcing structure; 2131, first reinforcing rib; 2132, second reinforcing rib; 214, mounting seat; 22, second edge beam; 221, second beam body; 2211, third end portion; 2212, fourth end portion; 2212A, third lightening groove; 222, second reinforcing structure; 2221, third reinforcing rib; 2222, fourth reinforcing rib; 3, cover body; 4, first explosion-proof valve; 500, battery pack; 5, battery; 51, battery body; 52, second explosion-proof valve; 501, battery group; 5011, first wall surface; 5012, second wall surface; 6, adhesive layer; 7, first spacer; 71, weak portion; 711, first piece body; 711A, mounting hole; 712, second piece body; 713, connecting body; 8, second spacer; 9, first sealing layer; 10, second sealing layer; 20, spacer strip; 30, third spacer; 40, elastic support; 401, first support section; 401A, through hole; 402, second support section; 4021, fourth section body; 4022, fifth section body; 4023, sixth section body; 50, first sealing ring; 60, second sealing ring; 60A, accommodating hole; 70, third sealing ring; 80, first fastener; 90, distance piece; 901, distance portion; 902, fixing portion; 90A, fixing hole; 100, second fastener; 200, protective cover; 200A, exhaust groove; 200B, open mouth. DETAILED DESCRIPTION

[0114] The specific embodiments of the present application will be further described with reference to the drawings and examples. The following examples are used to illustrate the present application, but not to limit the scope of the present application.

[0115] In the description of the application, it needs to be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined as "first", "second" can be explicitly or implicitly included one or more of the features. In the description of the application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0116] In the description of the application, it needs to be understood that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the communication inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances.

[0117] In the application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "below", "under" and "under" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0118] In the application embodiment, "parallel" means that the angle formed by straight lines, straight lines and surfaces, or surfaces is -1°-1°. In addition, "perpendicular" means that the angle formed by straight lines, straight lines and surfaces, or surfaces is 89°-91°. Equal distance, equal angle or equal area means that the tolerance range is -1%-1%.

[0119] The application provides a kind of electric equipment, it includes the battery pack as follows, wherein, battery pack is used to store and output electric energy, provides power supply for electric equipment, electric equipment includes but is not limited to electric vehicle, unmanned aerial vehicle, mobile power etc.;Since electric equipment uses the battery pack as follows, whereby, electric equipment also has the advantages of the battery pack as follows, the application does not make too much repetition.

[0120] As shown in FIG. 1 to FIG. 24, a battery pack 500 of a preferred embodiment of the application has a first direction Z, a second direction X and a third direction Y perpendicular to each other, the battery pack 500 includes a bottom plate assembly 1, a frame 2 and a cover 3; in the first direction Z, the bottom plate assembly 1 and the cover 3 are connected to the two ends of the frame 2 respectively, and the bottom plate assembly 1, the frame 2 and the cover 3 enclose a containing space 10A; the bottom plate assembly 1 is formed with a gas collecting cavity 1A; the frame 2 includes a first side beam 21, and the first side beam 21 has an exhaust passage 21A; wherein, the first side beam 21 includes a first beam body 211, an exhaust seat 212 and a first reinforcing structure 213, the first beam body 211 has opposite first and second end portions 2111 and 2112 in the second direction X, the first end portion 2111 faces the containing space 10A, and the first end portion 2111 has a first weight-reducing groove 2111A with a depth direction identical to the second direction X; the exhaust seat 212 is arranged in the first weight-reducing groove 2111A and connected to the first beam body 211; the first reinforcing structure 213 is arranged in the first weight-reducing groove 2111A and connected to the first beam body 211; and the exhaust passage 21A penetrates through the exhaust seat 212 and the first beam body 211 in the second direction X, and the exhaust passage 21A communicates with the gas collecting cavity 1A.

[0121] Specifically, the first side beam 21 of the frame 2 has the exhaust passage 21A, and the first side beam 21 includes the first beam body 211, the exhaust seat 212 and the first reinforcing structure 213, the first beam body 211 has the first weight-reducing groove 2111A, the exhaust seat 212 is arranged in the first weight-reducing groove 2111A and connected to the first beam body 211, specifically connected to the groove bottom surface of the first weight-reducing groove 2111A, the exhaust passage 21A penetrates through the exhaust seat 212 and the first beam body 211, and the first reinforcing structure 213 is connected to the first beam body 211 and located in the first weight-reducing groove 2111A, wherein, the arrangement of the first weight-reducing groove 2111A can make the frame 2 have the characteristic of light weight, in addition, since the exhaust passage 21A in the first side beam 21 is located in the exhaust seat 212, and the area of the first weight-reducing groove 2111A except the exhaust seat 212 is provided with the first reinforcing structure 213, therefore, the first side beam 21 has a certain strength, so that the battery pack 500 has better impact resistance.

[0122] In some embodiments, as shown in FIG. 6, the length dimension of the exhaust seat 212 is greater than the length dimension of the first reinforcing rib 2131 and the second reinforcing rib 2132 in the second direction X; as shown in FIG. 7, the side of the exhaust seat 212 facing away from the second end 2112 can be flush with the side of the first reinforcing rib 2131 and the second reinforcing rib 2132 facing away from the second end 2112, that is, the length dimension of the exhaust seat 212 is equal to the length dimension of the first reinforcing rib 2131 and the second reinforcing rib 2132 in the second direction X; both of the above-mentioned two dimensions of the exhaust seat 212 can play a role in exhaust, which is not limited in the present application.

[0123] In the present embodiment, as shown in FIG. 6 and FIG. 7, the first end 2111 has a first weight-reducing groove 2111A, and since the exhaust seat 212 is arranged on the groove bottom surface of the first weight-reducing groove 2111A, as shown in FIG. 4 and FIG. 5, the solid volume of the first side beam 21 at the position where the exhaust seat 212 is arranged is relatively large in the second direction X, based on which, the orthographic projection of the exhaust seat 212 on the end surface 2113 of the second end 2112 is a first projection 21B, and the area of the first projection 21B is a first area; the second end 2112 has a second weight-reducing groove 2112A, the depth direction of the second weight-reducing groove 2112A is the same as the second direction X, and the area of the slot opening 21C of the second weight-reducing groove 2112A is a second area; wherein the second area is smaller than the first area, that is, the slot opening 21C of the second weight-reducing groove 2112A is completely within the first projection 21B; the arrangement of the second weight-reducing groove 2112A reduces the solid volume of the first side beam 21 at the position where the exhaust seat 212 is arranged, which can further reduce the weight of the first side beam 21, so that the weight of the frame 2 is lighter.

[0124] Wherein the exhaust seat 212 is a cuboid or a square, the first area is measured by measuring the first height dimension of the exhaust seat 212 in the first direction Z and the first width dimension in the third direction Y with a length measuring tool, and the product of the first height dimension and the first width dimension is the first area; and the slot opening of the second weight-reducing groove 2112A is rectangular or square, the second area is measured by measuring the second height dimension of the slot opening of the second weight-reducing groove 2112A in the first direction Z and the second width dimension in the third direction Y with a length measuring tool, and the product of the second height dimension and the second width dimension is the second area.

[0125] In other embodiments, the shape of the first projection of the exhaust seat 212 and the shape of the slot opening of the second weight-reducing groove 2112A can also be other geometric shapes, at this time, the corresponding first area and second area can be obtained by conventional area calculation method, which is not described herein.

[0126] As shown in FIG. 5 and FIG. 14, the first side beam 21 further comprises a mounting seat 214, which is arranged in the second lightening groove 2112A and connected with the first beam body 211; the exhaust passage 21A penetrates through the exhaust seat 212, the first beam body 211 and the mounting seat 214; the battery pack 500 further comprises a first explosion-proof valve 4, which is connected with the mounting seat 214 and seals the exhaust passage 21A. Specifically, the arrangement of the mounting seat 214 is equivalent to increasing the solid volume of the first side beam 21, which can strengthen the strength of the first side beam 21 while achieving the installation of the first explosion-proof valve 4.

[0127] As one of the specific implementations of the present embodiment, as shown in FIG. 6 and FIG. 7, the first reinforcing structure 213 comprises a first reinforcing rib 2131 and a second reinforcing rib 2132; the first reinforcing rib 2131 is in a strip shape, the extension direction of the first reinforcing rib 2131 intersects with the first direction Z, the first reinforcing rib 2131 is connected with the groove bottom surface of the first lightening groove 2111A, the number of the first reinforcing rib 2131 is multiple, and the multiple first reinforcing ribs 2131 are arranged at intervals along the first direction Z; the second reinforcing rib 2132 is in a strip shape, the extension direction of the second reinforcing rib 2132 intersects with the third direction Y, the second reinforcing rib 2132 is connected with the groove bottom surface of the first lightening groove 2111A, the number of the second reinforcing rib 2132 is multiple, and the multiple second reinforcing ribs 2132 are arranged at intervals along the third direction Y, and one second reinforcing rib 2132 is arranged to intersect with at least part of the first reinforcing rib 2131. The first reinforcing structure 213 with such structure is simple in structure and can make the first side beam 21 have sufficient strength, so that the battery pack 500 has better impact resistance.

[0128] As shown in FIG. 2 and FIG. 3, the frame 2 further comprises a second side beam 22, and the first side beam 21 and the second side beam 22 are arranged at intervals along the second direction X; the second side beam 22 comprises a second beam body 221 and a second reinforcing structure 222; in the second direction X, the second beam body 221 has opposite third and fourth end portions 2211 and 2212, and the third end portion 2211 faces the accommodation space 10A; the fourth end portion 2212 has a third lightening groove 2212A, and the depth direction of the third lightening groove 2212A is the same as the second direction X; the second reinforcing structure 222 is arranged in the third lightening groove 2212A and connected with the second beam body 221; based on the arrangement of the third lightening groove 2212A and the second reinforcing structure 222, the second side beam 22 has the characteristics of high strength and light weight, and based on the high-strength first and second side beams 21 and 22, the battery pack 500 has higher impact resistance.

[0129] As shown in FIGS. 8 and 9, the battery pack 500 further comprises the battery 5 and the adhesive layer 6; the number of the battery 5 is multiple, the multiple batteries 5 are arranged in the accommodating space 10A and form a battery group 501, in the battery group 501, the multiple batteries 5 form multiple rows in the second direction X and form multiple columns in the third direction Y; in the second direction X, the battery group 501 has opposite first and second wall surfaces 5011 and 5012; the first wall surface 5011 faces the first end portion 2111, the first wall surface 5011 is arranged at a distance from the first end portion 2111, and the mounting space 10a is formed between the first wall surface 5011 and the first end portion 2111; the second wall surface 5012 faces the third end portion 2211, and the second wall surface 5012 is connected to the third end portion 2211 through the adhesive layer 6, specifically, the end surface of the third end portion 2211; specifically, the second wall surface 5012 and the end surface of the third end portion 2211 are both flat surfaces, when the second side beam 22 is stressed or the battery 5 is expanded, because the second wall surface 5012 and the end surface of the third end portion 2211 are flat surfaces, thus, each battery 5 in the battery group 501 is stressed more evenly, and the battery 5 does not have the phenomenon of stress concentration in some positions, and the use reliability of the battery 5 is relatively high.

[0130] In addition, because the mounting space 10a is formed between the first wall surface 5011 and the first end portion 2111, the mounting space 10a can be used to mount other devices of the battery pack 500, for example, a slave module of a battery 5 management system is mounted in the mounting space 10a, at this time, at least one of the first and second reinforcing ribs 2131 and 2132 can be connected to the slave module as a mounting and connecting component, without the need to additionally provide other structures for mounting the slave module, space can be saved, and the lightweight design of the battery pack 500 is facilitated.

[0131] In the embodiment, as shown in FIG. 3, the second reinforcing structure 222 comprises third and fourth reinforcing ribs 2221 and 2222; the third reinforcing rib 2221 is in a strip shape, the extending direction of the third reinforcing rib 2221 intersects the first direction Z, the third reinforcing rib 2221 is connected to the groove bottom surface of the second lightening groove 2112A, the number of the third reinforcing rib 2221 is multiple, and the multiple third reinforcing ribs 2221 are arranged at a distance along the first direction Z; the fourth reinforcing rib 2222 is in a strip shape, the extending direction of the fourth reinforcing rib 2222 intersects the third direction Y, the fourth reinforcing rib 2222 is connected to the groove bottom surface of the second lightening groove 2112A, the number of the fourth reinforcing rib 2222 is multiple, and the multiple fourth reinforcing ribs 2222 are arranged at a distance along the third direction Y, and one fourth reinforcing rib 2222 intersects at least part of the third reinforcing rib 2221; the second reinforcing structure 222 with such a structure is simple in structure, and can make the second side beam 22 have sufficient strength, so that the battery pack 500 has relatively good impact resistance.

[0132] As shown in FIGS. 13-14, the bottom plate assembly 1 includes a first plate body 11 and a second plate body 12, both of which are connected with the frame 2, and the first plate body 11 and the second plate body 12 are spaced apart along the first direction Z, forming a gas collection cavity 1A therebetween, wherein the second plate body 12 has a plurality of exhaust holes 12A penetrating along the first direction Z, which are in communication with the gas collection cavity 1A; the battery 5 includes a battery body 51 and a second explosion-proof valve 52, which is connected with one side of the battery body 51 facing the second plate body 12; wherein one second explosion-proof valve 52 faces one exhaust hole 12A; specifically, the second explosion-proof valve 52 is used to protect the battery body 51 from excessive internal pressure, when the internal pressure of the battery body 51 reaches a certain degree, the second explosion-proof valve 52 will start, i.e. open, to balance the internal pressure of the battery body 51 by releasing the spewing matter, thereby preventing the battery 5 from exploding and ensuring the safety performance of the battery 5; in actual application, when the battery pack 500 is applied to an electric vehicle, the cover body 3 of the battery pack 500 faces the passenger compartment, and the bottom plate assembly 1 faces the ground, thus, since the second explosion-proof valve 52 is arranged towards the bottom plate assembly 1, when the battery 5 spews, it will not directly spew towards the passenger compartment, improving safety and reducing harm to the passenger compartment; while the gas spewed out by the battery 5 enters the gas collection cavity 1A through the exhaust hole 12A and is discharged to the outside of the battery pack 500 through the exhaust passage 21A and the first explosion-proof valve 4.

[0133] Since the material sprayed out by the battery 5 through the second explosion-proof valve 52 has the characteristics of high temperature and high pressure, after entering the gas collection cavity 1A, its temperature and pressure will decrease, but if there is no protective measure, other normal batteries 5 are directly connected with the gas collection cavity 1A, the sprayed material will contact other normal batteries 5, causing secondary damage, leading to the heat influence or damage of the second explosion-proof valve 52 of other normal batteries 5, thereby causing other batteries 5 to also spray out and lose control. Therefore, as shown in FIG. 11, the battery pack 500 further comprises a plurality of first partitions 7, the first partitions 7 having a weak portion 71; the plurality of first partitions 7 are arranged between the battery group 501 and the second plate body 12, and one first partition 7 corresponds to one battery main body 51, wherein, in the first direction Z, the two ends of the first partition 7 are in contact with the battery main body 51 and the second plate body 12 respectively, and the exhaust hole 12A, the weak portion 71 and the second explosion-proof valve 52 are arranged in the first direction Z in sequence; wherein, the first partition 7 is made of a material resistant to high temperature and insulation, such as mica material or other materials commonly used in the art; specifically, when the battery 5 sprays, the high-temperature gas sprayed out through the second explosion-proof valve 52 will break through the weak portion 71 and enter the exhaust hole 12A. The purpose of the first partition 7 is to block the material sprayed out by the single battery 5 through the second explosion-proof valve 52, so as to avoid its influence on the surrounding other normal batteries 5 through the gas collection cavity 1A and the exhaust hole 12A, thereby improving the safety of the battery pack 500.

[0134] In some embodiments, as shown in FIG. 12, the first partition 7 is provided with a notch, the notch forms the weak portion 71, and when the battery 5 sprays, the notch is broken to allow the material sprayed out through the second explosion-proof valve 52 to pass through the exhaust hole 12A and enter the gas collection cavity 1A.

[0135] In other embodiments, as shown in FIG. 11, the first partition 7 comprises a first plate body 711, a second plate body 712 and a connecting body 713, the first plate body 711 is provided with a mounting hole 711A penetrating in the first direction Z, the second plate body 712 is arranged in the mounting hole 711A, the number of the connecting body 713 is plural, the connecting body 713 is located between the second plate body 712 and the first plate body 711, and the connecting body 713 connects the second plate body 712 and the first plate body 711, the plurality of connecting bodies 713 are arranged in a circumferential direction around the second plate body 712, the second plate body 712 and the connecting body 713 form the weak portion 71, when the battery 5 sprays, the material sprayed out through the second explosion-proof valve 52 can impact the weak portion 71 under high pressure, the connection between the connecting body 713 and the second plate body 712 and / or the first plate body 711 is disconnected, thereby the material sprayed out passes through the exhaust hole 12A and enters the gas collection cavity 1A. The first partition 7 with such structure has simple structure, convenient processing, and the weak portion 71 is easier to be broken by high-pressure material.

[0136] Further, as shown in FIG. 11, the battery pack 500 further comprises a second spacer 8, in the third direction Y, two adjacent first spacers 7 are connected by a second spacer 8, and a plurality of first spacers 7 are connected in a row, so that, in the first direction Z, a second spacer 8 is arranged between two adjacent batteries 5, at this time, the second spacer 8 plays a blocking role, which blocks the material sprayed by the single battery 5 through the second explosion-proof valve 52, so as to avoid affecting other normal batteries 5 around, and the first spacer 7 can play a better blocking effect.

[0137] In some embodiments, as shown in FIG. 19, the battery pack 500 further comprises a plurality of first sealing layers 9, which are arranged between the battery group 501 and the second plate body 12; in the second direction X, a single first sealing layer 9 is arranged between two adjacent rows of first spacers 7; in the first direction Z, the two ends of the first sealing layer 9 are respectively in contact with the second plate body 12 and the battery body 51. Specifically, the arrangement of the first sealing layer 9 provides a fixed connection effect for the battery 5, and also ensures the sealing performance of the battery 5 during spraying, so as to prevent the sprayed material from leaking through the connection between the battery 5, the first spacer 7, the second spacer 8 and the second plate body 12, thereby avoiding affecting other batteries 5 or elements around, so as to avoid the occurrence of fire burning or heat spreading. The arrangement of the first sealing layer 9 ensures that the material sprayed by the battery 5 through the second explosion-proof valve 52 can only enter the exhaust chamber 212A, thereby ensuring the safety of the battery pack 500.

[0138] In some embodiments, as shown in FIG. 19, the battery pack 500 further comprises a plurality of first sealing layers 9, which are arranged between the battery group 501 and the second plate body 12; in the second direction X, a single first sealing layer 9 is arranged between two adjacent rows of first spacers 7; in the first direction Z, the two ends of the first sealing layer 9 are respectively in contact with the second plate body 12 and the battery body 51. Specifically, the arrangement of the first sealing layer 9 provides a fixed connection effect for the battery 5, and also ensures the sealing performance of the battery 5 during spraying, so as to prevent the sprayed material from leaking through the connection between the battery 5, the first spacer 7, the second spacer 8 and the second plate body 12, thereby avoiding affecting other batteries 5 or elements around, so as to avoid the occurrence of fire burning or heat spreading. The arrangement of the first sealing layer 9 ensures that the material sprayed by the battery 5 through the second explosion-proof valve 52 can only enter the exhaust chamber 212A, thereby ensuring the safety of the battery pack 500.

[0138] In some embodiments, as shown in FIG. 19, the battery pack 500 further comprises a plurality of first sealing layers 9, which are arranged between the battery group 501 and the second plate body 12; in the second direction X, a single first sealing layer 9 is arranged between two adjacent rows of first spacers 7; in the first direction Z, the two ends of the first sealing layer 9 are respectively in contact with the second plate body 12 and the battery body 51. Specifically, the arrangement of the first sealing layer 9 provides a fixed connection effect for the battery 5, and also ensures the sealing performance of the battery 5 during spraying, so as to prevent the sprayed material from leaking through the connection between the battery 5, the first spacer 7, the second spacer 8 and the second plate body 12, thereby avoiding affecting other batteries 5 or elements around, so as to avoid the occurrence of fire burning or heat spreading. The arrangement of the first sealing layer 9 ensures that the material sprayed by the battery 5 through the second explosion-proof valve 52 can only enter the exhaust chamber 212A, thereby ensuring the safety of the battery pack 500.

[0139] Preferably, as shown in FIG. 11 and FIG. 12, in the second direction X, the length dimension of the first partition 7 is greater than the length dimension of the second partition 8, which is simple in structure, reduces the application of materials, and is conducive to saving production costs.

[0140] In the present application, as shown in FIG. 18, the battery pack 500 further comprises a plurality of third partitions 30, the third partitions 30 are strip-shaped, the third partitions 30 are arranged in the gas collection cavity 1A, and the third partitions 30 are connected with the first plate body 11, and the plurality of third partitions 30 are arranged at intervals along the second direction X; wherein one row of second explosion-proof valves 52 faces one third partition 30; specifically, after the battery 5 is spouted, the high-temperature and high-pressure material enters the gas collection cavity 1A through the exhaust hole 12A and directly impacts the first plate body 11, and one row of second explosion-proof valves 52 faces one third partition 30, and the third partition 30 covers the area that will be impacted as much as possible, which can reduce the strength and resistance requirements of the first plate body 11, and the third partition 30 can absorb the impact and block the high temperature, thereby improving the safety of the whole pack; the third partition 30 is made of a material resistant to high temperature and insulation, such as mica material or other materials commonly used in the field, and the present application does not limit this.

[0141] In the present application, as shown in FIG. 18, the battery pack 500 further comprises an elastic support 40, the elastic support 40 is arranged in the gas collection cavity 1A, and in the first direction Z, one end of the elastic support 40 is connected with the first plate body 11 and the other end is connected with the second plate body 12; specifically, on the one hand, the elastic support 40 plays a supporting role, because the surfaces of the first plate body 11 and the second plate body 12 are relatively large, the elastic support 40 is needed in the middle to abut against both of them, so as to ensure that the space between them will not collapse, and the elastic support 40 can also connect both of them and improve the overall structural strength; on the other hand, the elastic support 40 can produce elastic deformation when the first plate body 11 receives external impact force, thereby playing a role in relieving and absorbing the impact force, reducing the external force transmitted to the battery 5, and ensuring the safety performance of the battery 5.

[0142] As shown in FIG. 18, the elastic support 40 is strip-shaped, the length direction of the elastic support 40 is the same as the third direction Y, that is, the elastic support 40 extends in the third direction Y, and the number of the elastic support 40 is a plurality, and at least one elastic support 40 is arranged between two adjacent third partitions 30 in the second direction X, which ensures the overall structural strength of the battery pack 500, and in addition, the elastic support 40 is made of a material resistant to high temperature, so as to avoid the influence of the spouted material on the performance.

[0143] As shown in FIG. 20, the elastic support 40 comprises a plurality of first support segments 401 and a plurality of second support segments 402, the plurality of first support segments 401 are arranged at intervals along the third direction Y, and two adjacent first support segments 401 are connected by a second support segment 402; wherein the first support segment 401 is connected with the first plate body 11, and the second support segment 402 is protruded towards the second plate body 12 relative to the first plate body 11 to form an arched structure, so that the second support segment 402 is connected with the second plate body 12; since the second support segment 402 of the elastic support 40 is protruded towards the second plate body 12 relative to the first plate body 11 and forms an arched structure, therefore, if the bottom plate assembly 1 is impacted in the first direction Z, the second support segment 402 of the arched structure will be compressed and deformed in the first direction Z, thereby absorbing the impact, based on this, the battery pack 500 has a better impact resistance; in addition, since the bottom plate assembly 1 ensures the impact resistance of the battery pack 500 through the elastic support 40, therefore, the thickness and density of the first plate body 11 and the second plate body 12 do not need to be too large, thus, the weight of the bottom plate assembly 1 is relatively light, that is, the battery pack 500 of the present application has the characteristics of good impact resistance and light weight.

[0144] Further, as shown in FIG. 21 and FIG. 22, the bottom plate assembly 1 further comprises a boss 13, the boss 13 is located in the gas collecting cavity 1A, the boss 13 is connected with the second plate body 12, the boss 13 is strip-shaped, the boss 13 extends along the second direction X, the number of the boss 13 is a plurality, the plurality of bosses 13 are arranged at intervals along the third direction Y, and in the third direction Y, the boss 13 and the exhaust hole 12A are arranged alternately, the boss 13 has a first flow channel 13A, and each first flow channel 13A is communicated with each other; wherein in the third direction Y, the second support segment 402 is located between two adjacent bosses 13, the bottom plate assembly 1 of this structure, since the second plate body 12 is connected with the boss 13 and forms the first flow channel 13A, therefore, the battery 5 can be cooled by injecting cooling liquid into the first flow channel 13A, the battery pack 500 does not need to additionally set a liquid cooling plate, the structure of the battery pack 500 is simpler, which is conducive to the lightweight design of the battery pack 500, and the high-temperature substances ejected by the second explosion-proof valve 52 when the battery 5 is in thermal runaway can also be cooled by the cooling liquid in the first flow channel 13A, actively reducing the temperature of the thermal runaway gas, preventing the situation that the flammable gas produced by thermal runaway is discharged to the outside of the battery pack 500, and then ignites due to still high temperature and contact with oxygen in the air to meet the ignition condition.

[0145] As shown in FIG. 21 and FIG. 22, the boss 13 comprises a plurality of first connecting segments 131 and a plurality of second connecting segments 132, the plurality of first connecting segments 131 are arranged at intervals along the second direction X, and two adjacent first connecting segments 131 are connected by a second connecting segment 132, and the first flow channel 13A penetrates through the first connecting segment 131 and the second connecting segment 132; wherein, the second connecting segment 132 is protruded along the third direction Y relative to the first connecting segment 131, and between two adjacent second connecting segments 132, an exhaust hole 12A is arranged in the second direction X, and in the third direction Y, the second supporting segment 402 is located between two adjacent second connecting segments 132, because the second connecting segment 132 is protruded along the third direction Y relative to the first connecting segment 131, thus, the first flow channel 13A has a relatively wide range, that is, the cooling range is wide, wherein, in the first direction Z, the second connecting segment 132 is located at a position corresponding to two batteries 5, which can better cool the battery 5.

[0146] Further, as shown in FIG. 22, the second connecting segment 132 comprises a first segment body 1321, a second segment body 1322 and a third segment body 1323, the first segment body 1321 is in a straight strip shape, the length direction of the first segment body 1321 is the same as the second direction X, that is, the first segment body 1321 extends in the second direction X, the extension directions of the second segment body 1322 and the third segment body 1323 are both oblique to the third direction Y, the first segment body 1321 is connected with the second segment body 1322 and the third segment body 1323 at both ends in the second direction X respectively, and the first segment body 1321 is connected with the first connecting segment 131 through the second segment body 1322 and the third segment body 1323, specifically, because the first segment body 1321 is in a straight strip shape, thus, the flow resistance of the cooling liquid is relatively low when flowing through the first segment body 1321, the flow process is relatively smooth, and the cooling effect on the battery 5 is good.

[0147] As shown in FIG. 20, the second support section 402 includes a fourth section body 4021, a fifth section body 4022 and a sixth section body 4023, the fourth section body 4021 is in a straight strip shape, the length direction of the fourth section body 4021 is the same as the second direction X, that is, the fourth section body 4021 extends in the second direction X, the fifth section body 4022 and the sixth section body 4023 extend in directions oblique to the third direction Y, and the two ends of the fourth section body 4021 along the second direction X are connected with the fifth section body 4022 and the sixth section body 4023 respectively; wherein, in the second support section 402 between the adjacent second connecting sections 132 and the adjacent two second connecting sections 132 in the third direction Y, the first section body 1321, the second section body 1322 and the third section body 1323 of the adjacent two second connecting sections 132 enclose a clamping groove, the fourth section body 4021, the fifth section body 4022 and the sixth section body 4023 of the second support section 402 are clamped in the clamping groove, the first section body 1321 of one second connecting section 132, the fourth section body 4021 and the first section body 1321 of another second connecting section 132 are arranged along the third direction Y, the second section body 1322 of one second connecting section 132, the fifth section body 4022 and the second section body 1322 of another second connecting section 132 are arranged along the third direction Y, and the third section body 1323 of one second connecting section 132, the sixth section body 4023 and the third section body 1323 of another second connecting section 132 are arranged along the third direction Y; specifically, the second support section 402 and the second connecting section 132 are roughly in a trapezoidal shape in the second direction X, the second support section 402 is adapted to the shape of the second connecting section 132, so that when the battery pack 500 is subjected to an impact force, the second support section 402 can be firmly clamped between the adjacent two second connecting sections 132, thereby better conducting the impact force.

[0148] Further, the first support section 401 has a through hole 401A penetrating along the first direction Z, by arranging the through hole 401A, on the one hand, the weight of the elastic support 40 can be reduced, on the other hand, the through hole 401A has the ability to disperse stress and absorb deformation, when the elastic support 40 is subjected to an impact force in the first direction Z, the through hole 401A can provide a deformation space in the first direction Z to absorb and disperse stress.

[0149] In some other embodiments, as shown in FIG. 23, the second plate body 12 has a second flow channel 12B, whereby the battery 5 can be cooled by injecting cooling liquid into the second flow channel 12B, the battery pack 500 does not need to additionally provide a liquid cooling plate, the structure of the battery pack 500 is simpler, which is conducive to the lightweight design of the battery pack 500, and the high-temperature substances spouted out by the second explosion-proof valve 52 when the battery 5 is in thermal runaway can also be cooled by the cooling liquid in the second flow channel 12B, thereby actively reducing the temperature of the thermal runaway gas, and preventing the situation that the combustible gas generated by thermal runaway is discharged out of the battery pack 500, and then catches fire due to still high temperature and contact with oxygen in the air to meet the ignition condition.

[0150] In the present application, as shown in FIGS. 14 to 16, the battery pack 500 further comprises a first sealing ring 50, a second sealing ring 60 and a third sealing ring 70; the frame 2 has a first mounting surface 201, a second mounting surface 202 and a third mounting surface 203 arranged around the accommodating space 10A, the first mounting surface 201 faces the cover 3, and the second mounting surface 202 and the third mounting surface 203 both face away from the cover 3; wherein the first mounting surface 201 is sealingly connected with the cover 3 through the first sealing ring 50, the second mounting surface 202 is sealingly connected with the first plate body 11 through the second sealing ring 60, and the third mounting surface 203 is sealingly connected with the second plate body 12 through the third sealing ring 70, whereby the sealing performance of the battery pack 500 can be ensured, and the battery pack 500 is protected from external environment such as dust and water vapor, and the safety performance of the battery pack 500 is high.

[0151] Further, as shown in FIG. 16, the frame 2 has a first annular mounting groove 20A, the first mounting groove 20A is located on the first mounting surface 201, the first mounting groove 20A is arranged around the accommodating space 10A, and the groove wall surface of the first mounting groove 20A extends outwardly from the groove bottom surface to the groove opening, i.e. from the bottom to the top or in the first direction Z. Preferably, the cross section of the first mounting groove 20A is substantially inverted trapezoidal. More preferably, the cross section of the first mounting groove 20A is inverted trapezoidal. The first sealing ring 50 is arranged in the first mounting groove 20A. The first mounting groove 20A with such structure has an inclined extending groove side wall, when the cover 3 compresses the first sealing ring 50, the first sealing ring 50 deforms and can extend towards the groove side wall of the first mounting groove 20A, since the depth of the first mounting groove 20A is determined, the compression amount of the first sealing ring 50 is relatively determined, whereby the first sealing ring 50 has the characteristics of high service life and good sealing effect.

[0152] Further, as shown in FIG. 16, the frame 2 has a second mounting groove 20B, which is annular, is located on the first mounting surface 201, is arranged around the accommodation space 10A, and has a groove wall surface extending outwardly from a groove bottom surface to a groove opening, i.e., from bottom to top or in the first direction Z. Preferably, the second mounting groove 20B has a substantially inverted trapezoidal cross section. More preferably, the second mounting groove 20B has an inverted trapezoidal cross section. The first sealing ring 50 is arranged in the second mounting groove 20B, and the first mounting groove 20A is located on a side of the second mounting groove 20B close to the accommodation space 10A, i.e., the first mounting groove 20A is closer to the accommodation space 10A than the second mounting groove 20B. That is, the cover 3 and the first mounting surface 201 are sealed by the two first sealing rings 50, and the sealing effect is better.

[0153] As shown in FIG. 16, the battery pack 500 further includes a first fastener 80 connecting the cover 3 and the frame 2, and the first fastener 80 is located between the first mounting groove 20A and the second mounting groove 20B. Preferably, the number of the first fastener 80 is plural, and the plural first fasteners 80 are arranged at intervals around the accommodation space 10A. Specifically, the first fastener 80 is located between the first mounting groove 20A and the second mounting groove 20B, so that the cover 3 can press the two first sealing rings 50 by the first fastener 80, and the structure is simple and the installation is convenient.

[0154] As shown in FIG. 17, the second sealing ring 60 has an accommodation hole 60A penetrating in the first direction Z, and the battery pack 500 further includes a distance piece 90 arranged in the accommodation hole 60A. The distance piece 90 is connected with the first plate body 11 and the second mounting surface 202 at two ends thereof in the first direction Z. The distance piece 90 can limit the compression amount of the second sealing ring 60, i.e., when the first plate body 11 presses the second sealing ring 60 on the second mounting surface 202, the thickness of the second sealing ring 60 in the first direction Z is limited based on the arrangement of the distance piece 90, so that the second sealing ring 60 can be compressed to a proper thickness. The second sealing ring 60 has the characteristics of high service life and good sealing effect.

[0155] Further, as shown in FIG. 17, the number of the accommodating holes 60A is multiple, the multiple accommodating holes 60A are arranged at intervals around the accommodating space 10A; the number of the distance pieces 90 is multiple, one distance piece 90 is arranged in one accommodating hole 60A; wherein the distance piece 90 comprises a distance part 901 and a fixing part 902, the fixing part 902 is fixedly connected with the frame 2, the distance part 901 is arranged in the accommodating hole 60A, two ends of the distance part 901 in the first direction Z are connected with the first plate body 11 and the second mounting surface 202 respectively, one side of the distance part 901 facing the first plate body 11 is provided with a fixing hole 90A, the fixing hole 90A extends into the fixing part 902; the battery pack 500 further comprises multiple second fasteners 100, one second fastener 100 is fastened in one fixing hole 90A, so as to connect the first plate body 11 with the frame 2; that is, the distance piece 90 plays a role of limiting the thickness of the second sealing ring 60 and also plays a role of providing a connection for the second fastener 100, and the structure is simple, based on the distance piece 90 with such structure, the second fastener 100 can connect the first plate body 11 to the frame 2, and also can compress the second sealing ring 60 to a proper thickness, so that the first plate body 11 is stably connected with the frame 2, and the second sealing ring 60 has the characteristics of high service life and good sealing effect.

[0156] As shown in FIG. 14 and FIG. 15, the frame 2 has a third mounting groove 20C which is annular, the third mounting groove 20C is located on the third mounting surface 203, the third mounting groove 20C is arranged around the accommodating space 10A, and the groove wall surface of the third mounting groove 20C extends outwardly from the groove bottom surface to the groove opening, that is, from the bottom to the top or in the first direction Z. Preferably, the cross section of the third mounting groove 20C is substantially inverted trapezoidal. More preferably, the cross section of the third mounting groove 20C is inverted trapezoidal. The third mounting groove 20C is provided with a third sealing ring 70; the third mounting groove 20C with such structure, the groove side wall thereof extends obliquely, when the second plate body 12 compresses the third sealing ring 70, the third sealing ring 70 deforms and can extend towards the groove side wall of the third mounting groove 20C, since the depth of the third mounting groove 20C is determined, the compression amount of the third sealing ring 70 is relatively determined, thereby the third sealing ring 70 also has the characteristics of high service life and good sealing effect.

[0157] As shown in FIG. 1 and FIG. 14, the battery pack 500 further comprises a protective cover 200 having an exhaust groove 200A and an opening 200B, the protective cover 200 is connected with the second end portion 2112, and the protective cover 200 covers the second weight-reducing groove 2112A, the groove opening of the exhaust groove 200A faces the second weight-reducing groove 2112A, the opening 200B communicates with the exhaust groove 200A, and the opening 200B faces the side where the bottom plate assembly 1 is located, that is, the opening 200B faces the lower surface of the bottom plate assembly 1 along the first direction Z. That is, the gas sprayed out of the first explosion-proof valve 4 is sprayed towards the side where the bottom plate assembly 1 is located, specifically, the design of the protective cover 200 can prevent external interference to the first explosion-proof valve 4, and the application of the battery pack 500 with such structure in an electric vehicle can prevent foreign matters such as stones splashed by the pressed wheels during the driving of the vehicle from hitting the first explosion-proof valve 4 to cause accidental opening of the valve, and the structure of the battery pack 500 is more reliable.

[0158] In the present application, as shown in FIG. 24, the exhaust seat 212 has an exhaust cavity 212A and an air inlet opening 212B, the air inlet opening 212B communicates the gas collecting cavity 1A and the exhaust cavity 212A; the second end portion 2112 has an air outlet opening 2112B located on the groove bottom surface of the second weight-reducing groove 2112A, and the air outlet opening 2112B communicates with the exhaust cavity 212A; wherein the air inlet opening 212B, the exhaust cavity 212A and the air outlet opening 2112B form an exhaust passage 21A; the exhaust seat with such structure is simple in structure and convenient to process, and can effectively realize the exhaust of gas; wherein the mounting seat 214 is provided with an exhaust through hole, the exhaust through hole communicates with the air outlet opening 2112B, and the exhaust through hole, the air inlet opening 212B, the exhaust cavity 212A and the air outlet opening 2112B form the exhaust passage 21A.

[0159] The above only describes the preferred embodiments of the present application, and it should be noted that those skilled in the art can make several improvements and replacements without departing from the technical principles of the present application, and these improvements and replacements should also be considered as the protection scope of the present application.

Claims

1. A battery pack (500) having a first direction (Z) and a second direction (X) orthogonal, wherein, The battery pack (500) comprises a bottom plate assembly (1), a frame (2), and a cover (3); In the first direction (Z), the bottom plate assembly (1) and the cover (3) are connected with two ends of the frame (2) respectively, and the bottom plate assembly (1), the frame (2), and the cover (3) enclose a containing space (10A); The bottom plate assembly (1) is formed with a gas collecting cavity (1A); The frame (2) comprises a first side beam (21) having an exhaust passage (21A); The first side beam (21) comprises a first beam body (211), an exhaust seat (212), and a first reinforcing structure (213), In the second direction (X), the first beam body (211) has opposite first and second end portions (2111) and (2112), the first end portion (2111) faces the containing space (10A), and the first end portion (2111) has a first lightening groove (2111A) with a depth direction identical to the second direction (X); The exhaust seat (212) is arranged in the first lightening groove (2111A) and connected with the first beam body (211); The first reinforcing structure (213) is arranged in the first lightening groove (2111A) and connected with the first beam body (211); The exhaust passage (21A) penetrates the exhaust seat (212) and the first beam body (211) in the second direction (X), and the exhaust passage (21A) communicates with the gas collecting cavity (1A).

2. The battery pack (500) of claim 1, wherein, In the second direction (X), the exhaust seat (212) has a first projection (21B) on an end face (2113) of the second end portion (2112); The second end portion (2112) has a second lightening groove (2112A) with a depth direction identical to the second direction (X), and a groove opening (21C) of the second lightening groove (2112A) is completely within the first projection (21B).

3. The battery pack (500) of claim 2, wherein, The first side beam (21) further comprises a mounting seat (214) arranged in the second lightening groove (2112A) and connected with the first beam body (211); The exhaust passage (21A) penetrates the exhaust seat (212), the first beam body (211), and the mounting seat (214); The battery pack (500) further comprises a first explosion-proof valve (4) connected with the mounting seat (214), and the first explosion-proof valve (4) seals the exhaust passage (21A).

4. The battery pack (500) of claim 1, wherein, The battery pack (500) further has a third direction (Y), and the first direction (Z), the second direction (X), and the third direction (Y) are orthogonal to each other; The first reinforcing structure (213) comprises a first reinforcing rib (2131) and a second reinforcing rib (2132); The first reinforcing ribs (2131) are in strip shape, the extension direction of the first reinforcing ribs (2131) intersects the first direction (Z), the number of the first reinforcing ribs (2131) is multiple, and the multiple first reinforcing ribs (2131) are arranged at intervals along the first direction (Z); The second reinforcing ribs (2132) are in strip shape, the extension direction of the second reinforcing ribs (2132) intersects the third direction (Y), the number of the second reinforcing ribs (2132) is multiple, and the multiple second reinforcing ribs (2132) are arranged at intervals along the third direction (Y), and one second reinforcing rib (2132) is arranged to intersect at least part of the first reinforcing ribs (2131).

5. The battery pack (500) of claim 1, wherein, The frame (2) further comprises a second edge beam (22), and the first edge beam (21) and the second edge beam (22) are arranged at intervals along the second direction (X); The second edge beam (22) comprises a second beam body (221) and a second reinforcing structure (222); In the second direction (X), the second beam body (221) has opposite third and fourth end portions (2211) and (2212), and the third end portion (2211) faces the accommodation space (10A); The fourth end portion (2212) has a third weight-reducing groove (2212A), and the depth direction of the third weight-reducing groove (2212A) is the same as the second direction (X); The second reinforcing structure (222) is arranged in the third weight-reducing groove (2212A) and connected with the second beam body (221).

6. The battery pack (500) of claim 5, wherein, The battery pack (500) further has a third direction (Y), and the first direction (Z), the second direction (X) and the third direction (Y) are orthogonal to each other; The battery pack (500) further comprises a battery (5) and a glue layer (6); The number of the batteries (5) is multiple, and the multiple batteries (5) are arranged in the accommodation space (10A) and arrayed to form a battery group (501), and in the battery group (501), the multiple batteries (5) form multiple rows in the second direction (X) and multiple columns in the third direction (Y); In the second direction (X), the battery group (501) has opposite first and second wall surfaces (5011) and (5012); The first wall surface (5011) faces the first end portion (2111), the first wall surface (5011) is arranged at an interval from the first end portion (2111), and an installation space (10a) is formed between the first wall surface (5011) and the first end portion (2111); The second wall surface (5012) faces the third end portion (2211), and the second wall surface (5012) is connected with the third end portion (2211) through the glue layer (6).

7. The battery pack (500) of claim 5, wherein, The second reinforcing structure (222) comprises third and fourth reinforcing ribs (2221) and (2222). The third reinforcing ribs (2221) are in a strip shape, the extending direction of the third reinforcing ribs (2221) intersects with the first direction (Z), the number of the third reinforcing ribs (2221) is multiple, and the multiple third reinforcing ribs (2221) are arranged at intervals along the first direction (Z); The fourth reinforcing ribs (2222) are in a strip shape, the extending direction of the fourth reinforcing ribs (2222) intersects with the third direction (Y), the number of the fourth reinforcing ribs (2222) is multiple, and the multiple fourth reinforcing ribs (2222) are arranged at intervals along the third direction (Y), and one fourth reinforcing rib (2222) is arranged to intersect with at least part of the third reinforcing ribs (2221).

8. The battery pack (500) of claim 6, wherein, The bottom plate assembly (1) comprises a first plate body (11) and a second plate body (12), the first plate body (11) and the second plate body (12) are connected with the frame (2), and the first plate body (11) and the second plate body (12) are arranged at intervals along the first direction (Z), and the first plate body (11) and the second plate body (12) form the gas collecting cavity (1A) therebetween, wherein the second plate body (12) has a plurality of exhaust holes (12A) penetrating along the first direction (Z), and the exhaust holes (12A) communicate with the gas collecting cavity (1A); The battery (5) comprises a battery body (51) and a second explosion-proof valve (52), and the second explosion-proof valve (52) is connected with one side of the battery body (51) facing the second plate body (12); One second explosion-proof valve (52) faces one exhaust hole (12A).

9. The battery pack (500) of claim 8, wherein, The battery pack (500) further comprises a plurality of first spacers (7), and the first spacers (7) have weak portions (71); The plurality of first spacers (7) are arranged between the battery group (501) and the second plate body (12), and one first spacer (7) corresponds to one battery body (51), wherein in the first direction (Z), the two ends of the first spacer (7) are in contact with the battery body (51) and the second plate body (12) respectively, and the exhaust hole (12A), the weak portion (71) and the second explosion-proof valve (52) are arranged in sequence along the first direction (Z).

10. The battery pack (500) of claim 9, wherein, The first spacer (7) is provided with a notch, and the notch forms the weak portion (71).

11. The battery pack (50) of claim 9, wherein, The first spacer (7) comprises a first sheet (711), a second sheet (712) and a connecting body (713), the first sheet (711) is provided with a mounting hole (711A) penetrating in the first direction (Z), the second sheet (712) is arranged in the mounting hole (711A), the connecting body (713) is in a plurality, the connecting body (713) is located between the second sheet (712) and the first sheet (711), and the connecting body (713) connects the second sheet (712) and the first sheet (711), a plurality of the connecting body (713) is arranged in a circumferential interval around the second sheet (712), and the second sheet (712) and the connecting body (713) form the weak part (71).

12. The battery pack (500) of claim 9, wherein, The battery pack (500) further comprises a second spacer (8), and in the third direction (Y), two adjacent first spacers (7) are connected by the second spacer (8).

13. The battery pack (500) of claim 12, wherein, The battery pack (500) further comprises a plurality of first sealing layers (9), and the plurality of first sealing layers (9) are arranged between the battery group (501) and the second plate body (12). In the second direction (X), a single first sealing layer (9) is filled between two adjacent rows of first spacers (7). In the first direction (Z), two ends of the first sealing layer (9) are in contact with the second plate body (12) and the battery body (51) respectively.

14. The battery pack (500) of claim 12, wherein, The battery pack (500) further comprises a plurality of second sealing layers (10) and a plurality of partition strips (20), and the plurality of second sealing layers (10) and the plurality of partition strips (20) are arranged between the battery group (501) and the second plate body (12). The partition strip (20) extends in the third direction (Y), and a plurality of the partition strips (20) are arranged in an interval along the second direction (X). A single row of first spacers (7) is provided with the partition strip (20) on both sides in the second direction (X). The second sealing layer (10) is an adhesive layer, and the second sealing layer (10) is filled between the partition strip (20) and the single row of first spacers (7) adjacent thereto and between two adjacent partition strips (20). In the first direction (Z), two ends of the partition strip (20) are connected with the battery body (51) and the second plate body (12) respectively, and two sides of the second sealing layer (10) are connected with the battery body (51) and the second plate body (12) respectively.

15. The battery pack (500) according to claim 13 or 14, wherein In the second direction (X), the length dimension of the first spacer (7) is greater than that of the second spacer (8).

16. The battery pack (500) according to any one of claims 8-14, wherein, The battery pack (500) further comprises a plurality of third spacers (30), the third spacer (30) is in a strip shape, the third spacer (30) is arranged in the gas collecting cavity (1A), and the third spacer (30) is connected with the first plate body (11), and a plurality of the third spacers (30) are arranged in an interval along the second direction (X). One row of the second explosion-proof valve (52) faces one of the third partitions (30).

17. The battery pack (500) of claim 16, wherein, The battery pack (500) further comprises an elastic support (40) arranged in the gas collection cavity (1A), one end of the elastic support (40) is connected with the first plate body (11) and the other end is connected with the second plate body (12) in the first direction (Z).

18. The battery pack (500) of claim 17, wherein, The elastic support (40) is in a strip shape and extends in the third direction (Y), and the number of the elastic supports (40) is plural, and at least one elastic support (40) is arranged between two adjacent third partitions (30) in the second direction (X).

19. The battery pack (500) of claim 18, wherein, The elastic support (40) comprises a plurality of first support segments (401) and a plurality of second support segments (402), the first support segments (401) are arranged at intervals in the third direction (Y), and two adjacent first support segments (401) are connected by a second support segment (402). The first support segment (401) is connected with the first plate body (11), and the second support segment (402) protrudes towards the second plate body (12) relative to the first plate body (11), so that the second support segment (402) is connected with the second plate body (12).

20. The battery pack (500) of claim 19, wherein, The bottom plate assembly (1) further comprises a boss (13) located in the gas collection cavity (1A), the boss (13) is connected with the second plate body (12), the boss (13) is in a strip shape and extends in the second direction (X), the number of the bosses (13) is plural, the bosses (13) are arranged at intervals in the third direction (Y), and the bosses (13) and the exhaust holes (12A) are arranged alternately in the third direction (Y), the boss (13) has a first flow channel (13A), and each first flow channel (13A) is communicated with each other. In the third direction (Y), the second support segment (402) is located between two adjacent bosses (13).

21. The battery pack (500) of claim 20, wherein, The boss (13) comprises a plurality of first connecting segments (131) and a plurality of second connecting segments (132), the first connecting segments (131) are arranged at intervals in the second direction (X), and two adjacent first connecting segments (131) are connected by a second connecting segment (132), and the first flow channel (13A) penetrates through the first connecting segment (131) and the second connecting segment (132). In the second direction (X), the second connecting segment (132) protrudes in the third direction (Y) relative to the first connecting segment (131), and the exhaust hole (12A) is arranged between two adjacent second connecting segments (132) in the second direction (X), and the second support segment (402) is located between two adjacent second connecting segments (132) in the third direction (Y).

22. The battery pack (500) of claim 21, wherein, The second connecting section (132) comprises a first section body (1321), a second section body (1322) and a third section body (1323), the first section body (1321) is in a straight strip shape, the first section body (1321) extends in the second direction (X), the second section body (1322) and the third section body (1323) extend obliquely to the third direction (Y), the first section body (1321) is connected with the second section body (1322) and the third section body (1323) at both ends in the second direction (X) respectively, and the first section body (1321) is connected with the first connecting section (131) through the second section body (1322) and the third section body (1323).

23. The battery pack (500) of claim 22, wherein, The second supporting section (402) comprises a fourth section body (4021), a fifth section body (4022) and a sixth section body (4023), the fourth section body (4021) is in a straight strip shape, the fourth section body (4021) extends in the second direction (X), the fifth section body (4022) and the sixth section body (4023) extend obliquely to the third direction (Y), and the fourth section body (4021) is connected with the fifth section body (4022) and the sixth section body (4023) at both ends in the second direction (X) respectively; In the second supporting section (402) between two adjacent second connecting sections (132) in the third direction (Y), the first section body (1321), the second section body (1322) and the third section body (1323) of the two adjacent second connecting sections (132) enclose a clamping groove, the fourth section body (4021), the fifth section body (4022) and the sixth section body (4023) of the second supporting section (402) are clamped in the clamping groove, the first section body (1321) of one second connecting section (132), the fourth section body (4021) and the first section body (1321) of the other second connecting section (132) are arranged in the third direction (Y), the second section body (1322) of one second connecting section (132), the fifth section body (4022) and the second section body (1322) of the other second connecting section (132) are arranged in the third direction (Y), and the third section body (1323) of one second connecting section (132), the sixth section body (4023) and the third section body (1323) of the other second connecting section (132) are arranged in the third direction (Y).

24. The battery pack (500) of claim 19, wherein, The first supporting section (401) has a through hole (401A) penetrating in the first direction (Z).

25. The battery pack (500) according to any of claims 8-14, wherein The second plate body (12) has a second flow channel (12B).

26. The battery pack (500) according to any of claims 8-14, wherein The battery pack (500) further comprises a first sealing ring (50), a second sealing ring (60) and a third sealing ring (70); The second plate body (12) has a second flow channel (12B). The frame (2) has a first mounting surface (201), a second mounting surface (202) and a third mounting surface (203) arranged around the accommodation space (10A), the first mounting surface (201) faces the cover (3), and the second mounting surface (202) and the third mounting surface (203) both face away from the cover (3); The first mounting surface (201) is sealingly connected with the cover (3) through the first sealing ring (50), the second mounting surface (202) is sealingly connected with the first plate body (11) through the second sealing ring (60), and the third mounting surface (203) is sealingly connected with the second plate body (12) through the third sealing ring (70).

27. The battery pack (500) of claim 26, wherein, The frame (2) has an annular first mounting groove (20A), the first mounting groove (20A) is located on the first mounting surface (201), the first mounting groove (20A) is arranged around the accommodation space (10A), and the groove wall surface of the first mounting groove (20A) extends outwardly in the first direction (Z); the first mounting groove (20A) is provided with the first sealing ring (50).

28. The battery pack (500) of claim 27, wherein, The frame (2) has an annular second mounting groove (20B), the second mounting groove (20B) is located on the first mounting surface (201), the second mounting groove (20B) is arranged around the center of the accommodation space (10A), and the groove wall surface of the second mounting groove (20B) extends outwardly in the first direction (Z); the second mounting groove (20B) is provided with the first sealing ring (50), and the first mounting groove (20A) is closer to the accommodation space (10A) than the second mounting groove (20B).

29. The battery pack (500) of claim 28, wherein, The battery (5) further comprises a first fastener (80) connecting the cover (3) and the frame (2), and the first fastener (80) is located between the first mounting groove (20A) and the second mounting groove (20B), wherein the number of the first fastener (80) is multiple, and multiple first fasteners (80) are arranged at intervals around the accommodation space (10A).

30. The battery pack (500) of claim 26, wherein, The second sealing ring (60) has an accommodation hole (60A) penetrating in the first direction (Z); The battery pack (50) further comprises a distance piece (90) arranged in the accommodation hole (60A), and two ends of the distance piece (90) in the first direction (Z) are connected with the first plate body (11) and the second mounting surface (202), respectively.

31. The battery pack (500) of claim 30, wherein, The number of the accommodation hole (60A) is multiple, and multiple accommodation holes (60A) are arranged at intervals around the accommodation space (10A); The number of the distance piece (90) is multiple, and one distance piece (90) is arranged in one accommodation hole (60A); The distance piece (90) includes a distance part (901) and a fixing part (902). The fixing part (902) is fixedly connected with the frame (2). The distance part (901) is arranged in the accommodating hole (60A). Two ends of the distance part (901) in the first direction (Z) are connected with the first plate body (11) and the second mounting surface (202) respectively. One side of the distance part (901) facing the first plate body (11) is provided with a fixing hole (90A) extending into the fixing part (902). The battery pack (500) further includes a plurality of second fasteners (100). One second fastener (100) is fastened in one fixing hole (90A) to connect the first plate body (11) with the frame (2).

32. The battery pack (500) of claim 26, wherein, The frame (2) has a third mounting groove (20C) in the shape of a ring. The third mounting groove (20C) is located on the third mounting surface (203). The third mounting groove (20C) is arranged around the accommodating space (10A). The groove wall surface of the third mounting groove (20C) extends outwardly and inclines in the first direction (Z). The third mounting groove (20C) is provided with the third sealing ring (70).

33. The battery pack (500) of claim 3, wherein, The battery pack (500) further includes a protective cover (200). The protective cover (200) has an exhaust groove (200A) and an opening (200B). The protective cover (200) is connected with the second end part (2112) and covers the second weight-reducing groove (2112A). The groove opening of the exhaust groove (200A) faces the second weight-reducing groove (2112A). The opening (200B) is in communication with the exhaust groove (200A) and faces the bottom plate assembly (1) in the first direction (Z).

34. The battery pack (500) of claim 2, wherein, The exhaust seat (212) has an exhaust cavity (212A) and an air inlet opening (212B). The air inlet opening (212B) is in communication with the exhaust cavity (212A) and the air collecting cavity (1A). The second end part (2112) has an air outlet opening (2112B) located on the groove bottom surface of the second weight-reducing groove (2112A). The air outlet opening (2112B) is in communication with the exhaust cavity (212A). The air inlet opening (212B), the exhaust cavity (212A) and the air outlet opening (2112B) form the exhaust passage (21A).

35. An electrical device, comprising: The battery pack (500) includes the battery pack (500) according to any one of claims 1-33.

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