Battery pack

Abstract

The utility model relates to the technical field of batteries, in particular to a battery pack. The battery pack has a first direction, a second direction and a third direction which are intersected pairwise. The battery pack comprises a box body, the box body comprises a plurality of first beams and a plurality of second beams, the first beams extend along a first direction, the second beams extend along a second direction, and the plurality of first beams and the plurality of second beams are matched to define an accommodating cavity. The battery pack further comprises an adapter, the adapter comprises a main body part and at least one first connecting part, and at least one side of the main body part in the second direction is connected with the first connecting part; the main body part is connected with the second beam, the main body part and / or the first connecting part are / is connected with the first beam, and the size of the main body part in the third direction is larger than that of the first connecting part in the third direction. The battery pack further comprises a single battery, and the single battery is arranged in the accommodating cavity. In this way, the torsional strength between the first beam and the second beam can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery pack. Background Art

[0002] At present, most of the box frames of battery packs are formed by welding. The thermal stress and thermal deformation generated by welding have a great impact on the overall structural strength of the box frame, and it is difficult to detect the impact of thermal stress and thermal deformation on the structural strength of the box based on current detection methods. The box frame of the battery pack also adopts a splicing design. The beams of the box are spliced ​​with fasteners to replace the welding process, thereby better ensuring the overall structural strength of the box frame. However, the battery pack box currently using a splicing design has the problem of low structural torsional strength. Utility Model Content

[0003] The present application provides a battery pack, which can improve the torsional strength between a first beam and a second beam.

[0004] The present application provides a battery pack. The battery pack has a first direction, a second direction and a third direction that intersect each other. The battery pack includes a box body, the box body includes a plurality of first beams and a plurality of second beams, the first beams extend along the first direction, the second beams extend along the second direction, and the plurality of first beams cooperate with the plurality of second beams to enclose a receiving cavity. The battery pack also includes an adapter, the adapter includes a main body and at least one first connecting portion, the main body is connected to the first connecting portion on at least one side in the second direction; the main body is connected to the second beam, the main body and / or the first connecting portion are connected to the first beam, wherein the size of the main body in the third direction is greater than the size of the first connecting portion in the third direction. The battery pack also includes a single cell, and the single cell is disposed in the receiving cavity.

[0005] In an embodiment of the present application, the number of the first connection parts is at least two, and both sides of the main body in the second direction are connected to the first connection parts.

[0006] In one embodiment of the present application, the adapter also includes: a second connecting portion, connected to a side of the main body away from the first beam in the first direction, and the main body is connected to the second beam through the second connecting portion; wherein the first connecting portion is connected to a side of the second connecting portion close to the first beam.

[0007] In an embodiment of the present application, the second connection portion is connected to a side of the second beam away from the first beam; and / or the second connection portion is connected to a side of the second beam close to the first beam.

[0008] In one embodiment of the present application, the battery pack further includes: a first fixing member, through which the first connecting portion and the first beam are fixedly connected, wherein the first fixing member extends along a third direction.

[0009] In an embodiment of the present application, the battery pack further includes: a first fixing member, the first connecting portion and the first beam are fixedly connected through the first fixing member, and the first fixing member extends along the second direction.

[0010] In an embodiment of the present application, the first connecting portion includes a first sub-connecting portion and a second sub-connecting portion, the first sub-connecting portion and the second sub-connecting portion are respectively connected to two sides of the main body portion in the second direction; the first fixing member includes a first sub-fixing member and a second sub-fixing member; the first sub-fixing member is locked to a side of the first sub-connecting portion away from the second sub-connecting portion to fixedly connect the first sub-connecting portion and the first beam, and the first sub-fixing member extends along the second direction; the second sub-fixing member is locked to a side of the second sub-connecting portion away from the first sub-connecting portion to fixedly connect the second sub-connecting portion and the first beam, and the second sub-fixing member extends along the second direction.

[0011] In an embodiment of the present application, at least a part of the first sub-fixing member and the second sub-fixing member are oppositely arranged in a direction perpendicular to the second direction.

[0012] In an embodiment of the present application, the first beam is composed of a plurality of rib plates, and the plurality of rib plates include a target rib plate adjacent to the first connecting portion; the battery pack further includes: a first fixing member, including: a first fixing portion, connected to the first connecting portion; and a second fixing portion, connected to an end of the first fixing portion, the second fixing portion is located on a side of the target rib plate facing away from the first connecting portion, and the second fixing portion abuts against a surface of the target rib plate facing away from the first connecting portion, and the first fixing portion and the second fixing portion cooperate to fix the first connecting portion and the target rib plate.

[0013] In an embodiment of the present application, the first beam includes at least two first rib plates spaced apart along the third direction, and at least one first rib plate is adjacent to the first connecting portion; the battery pack further includes a first fixing member, and the first fixing member is locked to the adjacent first connecting portion and the first rib plate.

[0014] In an embodiment of the present application, the first beam includes at least two second rib plates spaced apart along the second direction, and at least one second rib plate is adjacent to the first connecting portion; the battery pack further includes a first fixing member, and the first fixing member is locked to the adjacent first connecting portion and the second rib plate.

[0015] In an embodiment of the present application, the at least two second rib plates include at least two first sub-rib plates spaced apart along the second direction and a second sub-rib plate located between two adjacent first sub-rib plates; wherein, the second sub-rib plate is adjacent to the first connecting portion, and the first fixing member is locked to the adjacent first connecting portion and the second sub-rib plate.

[0016] In one embodiment of the present application, the battery pack further includes a reinforcement, a second fixing member and a third fixing member, the reinforcement, the first beam and the main body are fixedly connected by the second fixing member, and the reinforcement and the second beam are fixedly connected by the third fixing member.

[0017] The beneficial effect of the present application is that, different from the prior art, the present application provides a battery pack. The box of the battery pack includes a plurality of first beams and a plurality of second beams, and the plurality of first beams and the plurality of second beams are spliced ​​by adapters, replacing the welding process of the prior art, which is conducive to ensuring the overall structural strength of the box.

[0018] The adapter of the present application includes a connected main body and at least one first connecting part, the main body is connected to the second beam, and the first connecting part is connected to the first beam. The size of the main body in the third direction is larger than the size of the first connecting part in the third direction, so that the adapter presents a stepped structure as a whole. In this way, when relative torsion occurs between the first beam and the second beam, the main body and the first connecting part respectively apply forces to the first beam, and the points of action of the forces applied by the main body and the first connecting part are different, thereby being able to improve the torsional strength between the first beam and the second beam.

[0019] Furthermore, the first connection portion of the adapter of the present application is adjacent to the rib plate of the first beam, and the first fixing member is locked to the adjacent first connection portion and the rib plate, so that the first connection portion and the rib plate of the first beam are reliably fixedly connected, thereby improving the connection strength between the first beam and the second beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 It is a structural schematic diagram of an embodiment of a box body of a battery pack of the present application;

[0022] Figures 2a - 2b It is a structural schematic diagram of a first embodiment of the present application in which the first beam and the second beam are connected via an adapter;

[0023] Figure 3 yes Figure 2a Schematic diagram of the cross-section structure in the AA direction;

[0024] Figure 4 It is a structural schematic diagram of the first embodiment of the adapter of the present application;

[0025] Figure 5It is a structural schematic diagram of a first embodiment of the first beam of the present application;

[0026] Figure 6 yes Figure 2a A schematic diagram of a top view structure;

[0027] Figure 7 yes Figure 6 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0028] Figure 8 It is a schematic diagram of the exploded structure of the second embodiment of the present application in which the first beam and the second beam are connected via an adapter;

[0029] Figure 9 It is a structural schematic diagram of a third embodiment of the present application in which the first beam and the second beam are connected via an adapter;

[0030] Figure 10 It is a structural schematic diagram of the second embodiment of the adapter of the present application;

[0031] Figure 11 yes Figure 9 A schematic diagram of a top view structure;

[0032] Figure 12 yes Figure 11 Schematic diagram of the cross-sectional structure in the CC direction;

[0033] Figure 13 It is a schematic diagram of the exploded structure of the fourth embodiment of the present application in which the first beam and the second beam are connected via an adapter;

[0034] Figure 14 It is a structural schematic diagram of the third embodiment of the adapter of the present application;

[0035] Figure 15 is a structural schematic diagram of a fifth embodiment of the present application in which the first beam and the second beam are connected via an adapter;

[0036] Figure 16 yes Figure 15 A side view schematic diagram of the structure;

[0037] Figure 17 yes Figure 16 Schematic diagram of the cross-sectional structure in the middle DD direction;

[0038] Figure 18 yes Figure 17 Schematic diagram of the structure of the middle E area;

[0039] Figure 19 It is a structural schematic diagram of the second embodiment of the first beam of the present application;

[0040] Figure 20 It is a schematic diagram of the explosion structure of the sixth embodiment of the present application in which the first beam and the second beam are connected via a transition piece.

[0041] Description of Reference Numerals

[0042] 10 Battery pack; 20 Box body; 21 First beam; 21a Rib plate; 211 First rib plate; 212 Second rib plate; 2121 First sub-rib plate; 2122 Second sub-rib plate; 2123 First avoidance hole; 2124 Second avoidance hole; 213 Matching rib plate; 22 Second beam; 23 Accommodation cavity; 24 Side beam; 30 Adapter; 31 Main body part; 32 First connection part; 321 First sub-connection part; 322 Second sub-connection part; 33 Second connection part; 41 First fixing part; 411 First sub-fixing part; 412 Second sub-fixing part; 413 First fixing portion; 414 Second fixing portion; 42 Second fixing part; 43 Third fixing part; 44 Fourth fixing part; 50 Reinforcement part. Detailed Description of the Embodiment

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present application. In addition, it should be understood that the specific implementation manners described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the orientation words such as "upper", "lower", "left", and "right" usually refer to the upper, lower, left, and right in the actual use or working state of the device, specifically the drawing direction in the accompanying drawings.

[0044] In the present application, unless otherwise clearly defined and limited, the terms "connected", "connected", "stacked", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0045] The present application provides a battery pack, which will be described in detail below. It should be noted that the description order of the following embodiments does not limit the preferred order of the embodiments of the present application. And in the following embodiments, each embodiment has its own focus. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0046] To solve the technical problem that the battery pack housing in the prior art has relatively low structural torsional strength, an embodiment of the present application provides a battery pack. The battery pack has a first direction, a second direction, and a third direction that intersect pairwise. The battery pack includes a housing, the housing includes a plurality of first beams and a plurality of second beams, the first beams extend along the first direction, the second beams extend along the second direction, and the plurality of first beams and the plurality of second beams cooperate to enclose a receiving cavity. The battery pack further includes an adapter, the adapter includes a main body portion and at least one first connecting portion, and the first connecting portion is connected to at least one side of the main body portion in the second direction; the main body portion is connected to the second beam, and the main body portion and / or the first connecting portion are connected to the first beam, wherein the size of the main body portion in the third direction is greater than the size of the first connecting portion in the third direction. The battery pack further includes a single battery, and the single battery is disposed in the receiving cavity. Details will be elaborated below.

[0047] Please refer to Figure 1 , Figure 1 FIG. is a schematic structural diagram of an embodiment of the housing of the battery pack of the present application.

[0048] In one embodiment, the battery pack 10 includes a housing 20 and a plurality of single batteries, and the plurality of single batteries are accommodated in the housing 20. The single battery includes, but is not limited to, lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of the present disclosure do not limit this. The battery pack 10 is a power supply for an electrical device. The electrical device can be a mobile phone, a portable device, a laptop computer, a battery car, an electric vehicle, a ship, a spacecraft, an electric toy, and an electric tool, etc. For example, the spacecraft includes an airplane, a rocket, a space shuttle, and a spaceship, etc.; the electric toy includes a fixed or mobile electric toy, such as a game console, an electric vehicle toy, an electric ship toy, and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and a railway electric tool, such as an electric drill, an electric grinding wheel, an electric wrench, an electric screwdriver, a hammer drill, an impact electric drill, a concrete vibrator, and an electric planer, etc.

[0049] Specifically, the housing 20 includes a plurality of first beams 21 and a plurality of second beams 22, the extending direction of the first beam 21 intersects with the extending direction of the second beam 22, the plurality of first beams 21 and the plurality of second beams 22 cooperate to enclose a receiving cavity 23, and the single battery is disposed in the receiving cavity 23. The first beam 21 and the second beam 22 are spliced through an adapter 30, replacing the way of welding connection between the first beam 21 and the second beam 22, which can avoid the influence of thermal stress and thermal deformation generated by welding on the overall structural strength of the housing 20, and thus is beneficial to ensuring the overall structural strength of the housing 20.

[0050] It should be noted that the first beam 21 and the second beam 22 can both be beam structures inside the box body 20, or at least one of the first beam 21 and the second beam 22 is a beam structure outside the box body 20. In other words, in the embodiments of the present application, the beam structures inside the box body 20 can be spliced through the adapter 30, or the beam structures outside the box body 20 can be spliced through the adapter 30, or the beam structures inside the box body 20 and the beam structures outside the box body 20 can be spliced through the adapter 30. For example, in this embodiment, both the first beam 21 and the second beam 22 are beam structures inside the box body 20. The box body 20 further includes side beams 24, which surround the outside of the first beam 21 and the second beam 22. The first beam 21 and the second beam 22 are spliced through the adapter 30. Of course, the first beam 21 and the side beam 24 and / or the second beam 22 and the side beam 24 can also be spliced through the adapter 30.

[0051] Please refer to Figures 2a to 7 , Figures 2a - 2b is a schematic structural diagram of the first embodiment in which the first beam and the second beam of the present application are connected by an adapter, Figure 3 is Figure 2a the schematic cross-sectional structure diagram in the A-A direction in Figure 4 is a schematic structural diagram of the first embodiment of the adapter of the present application, Figure 5 is a schematic structural diagram of the first embodiment of the first beam of the present application, Figure 6 is Figure 2a the top view structural diagram of Figure 7 is Figure 6 the schematic cross-sectional structure diagram in the B-B direction in

[0052] In one embodiment, the battery pack 10 has a first direction X, a second direction Y, and a third direction Z, and the first direction X, the second direction Y, and the third direction Z intersect pairwise. The first beam 21 extends along the first direction X, and the second beam 22 extends along the second direction Y. In the embodiments of the present application, it is exemplarily described with the first direction X, the second direction Y, and the third direction Z being perpendicular to each other pairwise, which is only for the need of discussion and is not limited thereby.

[0053] The adapter 30 includes a connected main body portion 31 and at least one first connection portion 32. The first connection portion 32 is connected to at least one side of the main body portion 31 in the second direction Y. The main body portion 31 is connected to the second beam 22, and the main body portion 31 and / or the first connection portion 32 is connected to the first beam 21, so as to realize the splicing of the first beam 21 and the second beam 22 through the adapter 30.

[0054] Such as Figure 4As shown, the dimension of the main body portion 31 in the third direction Z is greater than that of the first connecting portion 32 in the third direction Z, such that the adapter 30 as a whole presents a stepped structure. In this way, when relative torsion occurs between the first beam 21 and the second beam 22, the main body portion 31 and the first connecting portion 32 respectively exert acting forces on the first beam 21, and the acting points of the acting forces exerted by the main body portion 31 and the first connecting portion 32 are different, thereby improving the torsional strength between the first beam 21 and the second beam 22.

[0055] For example, as Figure 2b and Figure 6 shown, when the first beam 21 rotates relative to the second beam 22 along the Figure 6 direction indicated by the dashed arrow in the figure, the main body portion 31 of the adapter 30 exerts an acting force F1 on the first beam 21, and the first connecting portion 32 exerts an acting force F2 on the first beam 21. The acting points of the acting force F1 and the acting force F2 are different, thereby improving the torsional strength between the first beam 21 and the second beam 22. Moreover, in this embodiment, the dimension of the first connecting portion 32 in the third direction Z is small, which can reduce the material cost of the adapter 30 and reduce the weight of the adapter 30. If the dimension of the first connecting portion 32 in the third direction Z is greater than that of the main body portion 31 in the third direction Z, the protruding part of the first connecting portion 32 relative to the main body portion 31 is likely to have a problem of being too high, which will affect the normal closing between the box body 20 and the box cover.

[0056] Furthermore, the number of the first connecting portions 32 is at least two, and the first connecting portions 32 are connected to both sides of the main body portion 31 in the second direction Y. In this way, no matter whether the first beam 21 rotates relative to the second beam 22 along the Figure 6 direction indicated by the dashed arrow in the figure or along the Figure 6 opposite direction of the dashed arrow in the figure, there are corresponding first connecting portions 32 and the main body portion 31 that cooperate to exert anti-torsion acting forces on the first beam 21, which can ensure the torsional strength between the first beam 21 and the second beam 22 in different torsional directions.

[0057] It should be noted that Figure 4 exemplarily shows that the first connecting portion 32 is arranged close to the bottom of the main body portion 31. Of course, in other embodiments of the present application, the first connecting portion 32 can also be arranged close to the top of the main body portion 31, which is not limited herein. Optionally, the material of the adapter 30 can be aluminum alloy, etc., and the adapter 30 can be formed by die-casting process.

[0058] In one embodiment, the volume of the main body portion 31 is V1 cm 3 and the volume of the first connecting portion 32 is V2 cm 3, satisfying: 1 < V1 / V2 ≤ 4. In this embodiment, by reasonably setting the volumes of the main body portion 31 and the first connecting portion 32, the torsional strength between the first beam 21 and the second beam 22 can be ensured, the material cost of the adapter 30 can be reduced, and the weight of the adapter 30 can be lightened.

[0059] Optionally, the volume V1 of the main body portion 31 further satisfies: 16 ≤ V1 ≤ 80. For example, V1 can be any value among 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80.

[0060] The volume V2 of the first connecting portion 32 further satisfies: 4 ≤ V2 ≤ 80. For example, V2 can be any value among 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80.

[0061] In one embodiment, the adapter 30 further includes a second connecting portion 33. The second connecting portion 33 is connected to the side of the main body portion 31 away from the first beam 21 in the first direction X, and the main body portion 31 is connected to the second beam 22 through the second connecting portion 33. The first connecting portion 32 is connected to the side of the second connecting portion 33 close to the first beam 21, that is, the first connecting portion 32 is respectively connected to the main body portion 31 and the second connecting portion 33, so that the overall structure strength of the adapter 30 is relatively high, which is beneficial to ensuring the stability of the connection relationship between the first beam 21 and the second beam 22, and further beneficial to ensuring the overall structure strength of the box body 20.

[0062] In one embodiment, the second connecting portion 33 is connected to a side of the second beam 22 away from the first beam 21, and / or the second connecting portion 33 is connected to a side of the second beam 22 close to the first beam 21. This embodiment exemplarily shows that the second connecting portion 33 is connected to a side of the second beam 22 away from the first beam 21. The main body portion 31 of the adapter 30 passes through the second beam 22. The battery pack 10 further includes a fourth fixing member 44, and the second connecting portion 33 is fixed to a side of the second beam 22 away from the first beam 21 through the fourth fixing member 44.

[0063] Please continue to refer to Figures 5 to 7 . In one embodiment, the battery pack 10 further includes a first fixing member 41. The first connecting portion 32 and the first beam 21 are fixedly connected through the first fixing member 41, wherein the first fixing member 41 extends along the third direction Z.

[0064] Specifically, the first beam 21 is composed of a plurality of rib plates 21a, and at least one rib plate 21a is adjacent to the first connecting portion 32. That the rib plate 21a is adjacent to the first connecting portion 32 should be understood as that the rib plate 21a is relatively close to the first connecting portion 32, and there is no other rib plate 21a between the rib plate 21a and the first connecting portion 32. The first fixing member 41 is locked to the adjacent first connecting portion 32 and the rib plate 21a of the first beam 21, that is, the first fixing member 41 is directly locked to the adjacent first connecting portion 32 and the rib plate 21a, so that a reliable fixed connection is formed between the first connecting portion 32 and the rib plate 21a of the first beam 21, and the connection strength between the first beam 21 and the second beam 22 can be improved.

[0065] Further, among the plurality of rib plates 21a of the first beam 21, the rib plate 21a adjacent to the first connecting portion 32 is the target rib plate. The position of the target rib plate in the first beam 21 will be described below. The first fixing member 41 includes a first fixing portion 413 and a second fixing portion 414. The first fixing portion 413 is connected to the first connecting portion 32. The second fixing portion 414 is connected to an end of the first fixing portion 413. The second fixing portion 414 is located on a side of the target rib plate facing away from the first connecting portion 32, and the second fixing portion 414 abuts against a surface of the target rib plate facing away from the first connecting portion 32. The first fixing portion 413 and the second fixing portion 414 cooperate to fix the first connecting portion 32 and the target rib plate.

[0066] In one embodiment, the plurality of rib plates 21a of the first beam 21 include at least two first rib plates 211 spaced apart along the third direction Z and at least two second rib plates 212 spaced apart along the second direction Y. The first rib plates 211 and the second rib plates 212 are connected to form a complete first beam 21.

[0067] Further, the first beam 21 further includes a cooperating rib plate 213, and the cooperating rib plate 213 is disposed on the top of the first rib plate 211 closest to the lid. As described in the above embodiments, if the dimension of the first connecting portion 32 in the third direction Z is greater than the dimension of the main body portion 31 in the third direction Z, the protruding portion of the first connecting portion 32 relative to the main body portion 31 is likely to exceed the height of the cooperating rib plate 213, and the protruding first connecting portion 32 will affect the closing between the box body 20 and the lid.

[0068] In one embodiment, at least one of the first rib plates 211 is a target rib plate. The at least one first rib plate 211 is adjacent to the first connecting portion 32, and the first fixing member 41 is locked to the adjacent first connecting portion 32 and the first rib plate 211. The first fixing portion 413 of the first fixing member 41 is connected to the first connecting portion 32, and the second fixing portion 414 is located on the side of the first rib plate 211 facing away from the first connecting portion 32, and the second fixing portion 414 abuts against the surface of the first rib plate 211 facing away from the first connecting portion 32.

[0069] For example, for the example in which the first connecting portions 32 are connected to both sides of the main body portion 31 in the second direction Y, the first connecting portion 32 includes a first sub-connecting portion 321 and a second sub-connecting portion 322, and the first sub-connecting portion 321 and the second sub-connecting portion 322 are respectively connected to both sides of the main body portion 31 in the second direction Y. The first rib plates 211 are disposed on both sides of the first beam 21 in the second direction Y, and the first sub-connecting portion 321 and the second sub-connecting portion 322 are respectively adjacent to different first rib plates 211 on both sides of the first beam 21. The first fixing member 41 includes a first sub-fixing member 411 and a second sub-fixing member 412. The first sub-fixing member 411 is locked to the first sub-connecting portion 321 and its adjacent first rib plate 211 to fixedly connect the first sub-connecting portion 321 to the first beam 21. The first fixing portion 413 of the first sub-fixing member 411 is connected to the first sub-connecting portion 321, and the second fixing portion 414 of the first sub-fixing member 411 is located on the side of the first rib plate 211 facing away from the first sub-connecting portion 321, and the second fixing portion 414 of the first sub-fixing member 411 abuts against the surface of the first rib plate 211 facing away from the first sub-connecting portion 321. The second sub-fixing member 412 is locked to the second sub-connecting portion 322 and its adjacent first rib plate 211 to fixedly connect the second sub-connecting portion 322 to the first beam 21. The first fixing portion 413 of the second sub-fixing member 412 is connected to the second sub-connecting portion 322, and the second fixing portion 414 of the second sub-fixing member 412 is located on the side of the first rib plate 211 facing away from the second sub-connecting portion 322, and the second fixing portion 414 of the second sub-fixing member 412 abuts against the surface of the first rib plate 211 facing away from the second sub-connecting portion 322.

[0070] In one embodiment, the battery pack 10 further includes a reinforcing member 50 and a third fixing member 43. The reinforcing member 50, the first beam 21, and the main body portion 31 are fixedly connected by a second fixing member 42. Specifically, the reinforcing member 50, the first rib plate 211 of the first beam 21, and the main body portion 31 are fixedly connected by the second fixing member 42. The reinforcing member 50 is also fixedly connected to the second beam 22 by a third fixing member 43. The reinforcing member 50 can enhance the connection strength between the first beam 21 and the second beam 22 on the basis of the adapter 30.

[0071] Optionally, the material of the reinforcing member 50 can be aluminum alloy or the like, and the reinforcing member 50 can be formed by die-casting.

[0072] It should be noted that the first fixing member 41, the second fixing member 42, the third fixing member 43, and the fourth fixing member 44 can be fasteners such as screws, bolts, and rivets. Exemplarily, in this embodiment, the first fixing member 41 and the second fixing member 42 can be bolts or the like, and the first fixing member 41 and the second fixing member 42 are connected to the wire thread inserts of the adapter 30. The third fixing member 43 and the fourth fixing member 44 can be blind rivets or the like. And, a structural adhesive can be applied between the adapter 30 and the first beam 21 and / or between the adapter 30 and the second beam 22 to further improve the connection strength between the first beam 21 and the second beam 22.

[0073] Please refer to Figure 8 , Figure 8 which is an exploded structural schematic diagram of the second embodiment of the connection between the first beam and the second beam of the present application through an adapter.

[0074] In one embodiment, the adapter 30 includes a main body portion 31, a first connection portion 32, and a second connection portion 33. The first connection portion 32 is connected to at least one side of the main body portion 31 in the second direction Y. The second connection portion 33 is connected to the side of the main body portion 31 away from the first beam 21 in the first direction X, and the main body portion 31 is connected to the second beam 22 through the second connection portion 33. The first connection portion 32 is connected to the side of the second connection portion 33 close to the first beam 21, that is, the first connection portion 32 is connected to the main body portion 31 and the second connection portion 33 respectively. The connection manner between the adapter 30 and the first beam 21 has been elaborated in detail in the above embodiment and will not be repeated here.

[0075] The difference between this embodiment and the above embodiment is that the second connection portion 33 is connected to the side of the second beam 22 close to the first beam 21. In this embodiment, the main body portion 31 of the adapter 30 does not pass through the second beam 22, and the second connection portion 33 is fixed to the side of the second beam 22 close to the first beam 21 by a fourth fixing member 44. In this way, the second beam 22 in this embodiment omits the hollow design for the main body portion 31 of the adapter 30 to pass through, which is beneficial to ensuring the overall structural strength of the second beam 22 and further beneficial to ensuring the overall structural strength of the box body 20.

[0076] Please refer to Figures 9 to 12 , Figure 9 which is a schematic structural view of the third embodiment in which the first beam and the second beam of the present application are connected through an adapter, Figure 10 which is a schematic structural view of the second embodiment of the adapter of the present application, Figure 11 is Figure 9 the top view structural schematic diagram of Figure 12 is Figure 11 the sectional structural schematic diagram in the C-C direction of

[0077] In one embodiment, the adapter 30 includes a main body portion 31, a first connecting portion 32, and a second connecting portion 33. The first connecting portion 32 is connected to at least one side of the main body portion 31 in the second direction Y. The second connecting portion 33 is connected to the side of the main body portion 31 away from the first beam 21 in the first direction X, and the main body portion 31 is connected to the second beam 22 through the second connecting portion 33. The first connecting portion 32 is connected to the side of the second connecting portion 33 close to the first beam 21, that is, the first connecting portion 32 is respectively connected to the main body portion 31 and the second connecting portion 33. The connection manner between the adapter 30 and the first beam 21 has been elaborated in detail in the above embodiments and will not be repeated here.

[0078] The main body portion 31 of the adapter 30 passes through the second beam 22. The second connecting portion 33 is fixed to the side of the second beam 22 away from the first beam 21 through a fourth fixing member 44. The first beam 21 and the second beam 22 are also fixedly connected through a reinforcing member 50. The reinforcing member 50 can enhance the connection strength between the first beam 21 and the second beam 22 on the basis of the adapter 30.

[0079] The difference between this embodiment and the above embodiment is that the first fixing member 41 extends along the second direction Y, that is, the first fixing member 41 latches the first connecting portion 32 and the first beam 21 laterally from the side. Specifically, the first sub-fixing member 411 latches to the side of the first sub-connecting portion 321 away from the second sub-connecting portion 322 to fixedly connect the first sub-connecting portion 321 and the first beam 21, and the first sub-fixing member 411 extends along the second direction Y. The second sub-fixing member 412 latches to the side of the second sub-connecting portion 322 away from the first sub-connecting portion 321 to fixedly connect the second sub-connecting portion 322 and the first beam 21, and the second sub-fixing member 412 extends along the second direction Y.

[0080] In the above manner, there is no need to reserve an installation space for installing the first fixing member 41 on the surface of the first connecting portion 32 in the third direction Z. Therefore, it is beneficial to reduce the size of the first connecting portion 32 in the second direction Y, and further reduce the space occupied by the first connecting portion 32 in the side accommodation cavity 23, which is beneficial to improving the utilization rate of the internal space of the box 20 to improve the energy density of the battery pack 10.

[0081] It should be noted that the dimension of the first connecting portion 32 in the second direction Y is L1 mm ( Figure 12 taking the first sub-connecting portion 321 as an example in [description], the dimension of the main body portion 31 in the second direction Y is L2 mm, and it satisfies: 0.01 ≤ L1 / L2 ≤ 5. For example, L1 / L2 can be any value among 0.01, 0.05, 0.1, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5. Thus, it can be seen that in this embodiment, by setting the first fixing member 41 to extend along the second direction Y, the first fixing member 41 laterally locks the first connecting portion 32 and the first beam 21 from the side, reducing the dimension of the first connecting portion 32 in the second direction Y.

[0082] The dimension L1 mm of the first connecting portion 32 in the second direction Y also satisfies: 0.5 ≤ L1 ≤ 100. For example, L1 can be any value among 0.5, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100.

[0083] The dimension L2 mm of the main body portion 31 in the second direction Y also satisfies: 10 ≤ L2 ≤ 100. For example, L2 can be any value among 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100.

[0084] The multiple rib plates 21a of the first beam 21 include at least two first rib plates 211 spaced apart along the third direction Z and at least two second rib plates 212 spaced apart along the second direction Y. At least one of the second rib plates 212 is a target rib plate. The at least one second rib plate 212 is adjacent to the first connecting portion 32, and the first fixing member 41 is locked to the adjacent first connecting portion 32 and the second rib plate 212. The first fixing portion 413 of the first fixing member 41 is connected to the first connecting portion 32, and the second fixing portion 414 is located on the side of the second rib plate 212 facing away from the first connecting portion 32, and the second fixing portion 414 abuts against the surface of the second rib plate 212 facing away from the first connecting portion 32.

[0085] For example, in the example where the first connecting portions 32 are connected to both sides of the main body portion 31 in the second direction Y, the second rib plates 212 are provided on both sides of the first beam 21 in the second direction Y, and the first sub-connecting portion 321 and the second sub-connecting portion 322 are adjacent to different second rib plates 212 on both sides of the first beam 21 respectively. The first sub-fixing member 411 is locked to the first sub-connecting portion 321 and its adjacent second rib plate 212 to fixedly connect the first sub-connecting portion 321 to the first beam 21. The first fixing portion 413 of the first sub-fixing member 411 is connected to the first sub-connecting portion 321, and the second fixing portion 414 of the first sub-fixing member 411 is located on the side of the second rib plate 212 facing away from the first sub-connecting portion 321, and the second fixing portion 414 of the first sub-fixing member 411 abuts against the surface of the second rib plate 212 facing away from the first sub-connecting portion 321. The second sub-fixing member 412 is locked to the second sub-connecting portion 322 and its adjacent second rib plate 212 to fixedly connect the second sub-connecting portion 322 to the first beam 21. The first fixing portion 413 of the second sub-fixing member 412 is connected to the second sub-connecting portion 322, and the second fixing portion 414 of the second sub-fixing member 412 is located on the side of the second rib plate 212 facing away from the second sub-connecting portion 322, and the second fixing portion 414 of the second sub-fixing member 412 abuts against the surface of the second rib plate 212 facing away from the second sub-connecting portion 322.

[0086] Please refer to Figure 13 , Figure 13 which is an exploded structural schematic diagram of the fourth embodiment of the connection between the first beam and the second beam of the present application through the adapter.

[0087] In one embodiment, the adapter 30 includes a main body portion 31, a first connecting portion 32, and a second connecting portion 33. The first connecting portion 32 is connected to at least one side of the main body portion 31 in the second direction Y. The second connecting portion 33 is connected to the side of the main body portion 31 away from the first beam 21 in the first direction X, and the main body portion 31 is connected to the second beam 22 through the second connecting portion 33. The first connecting portion 32 is connected to the side of the second connecting portion 33 close to the first beam 21, that is, the first connecting portion 32 is connected to the main body portion 31 and the second connecting portion 33 respectively. The connection manner between the adapter 30 and the first beam 21 has been elaborated in detail in the above embodiment and will not be repeated here.

[0088] The first fixing member 41 extends along the second direction Y, that is, the first fixing member 41 laterally locks the first connecting portion 32 and the first beam 21 from the side. Specifically, the first sub-fixing member 411 locks to the side of the first sub-connecting portion 321 away from the second sub-connecting portion 322 to fixedly connect the first sub-connecting portion 321 and the first beam 21, and the first sub-fixing member 411 extends along the second direction Y. The second sub-fixing member 412 locks to the side of the second sub-connecting portion 322 away from the first sub-connecting portion 321 to fixedly connect the second sub-connecting portion 322 and the first beam 21, and the second sub-fixing member 412 extends along the second direction Y.

[0089] The difference between this embodiment and the above embodiment is that the second connecting portion 33 is connected to the side of the second beam 22 close to the first beam 21. In this embodiment, the main body portion 31 of the adapter 30 does not pass through the second beam 22, and the second connecting portion 33 is fixed to the side of the second beam 22 close to the first beam 21 through the fourth fixing member 44. In this way, the second beam 22 in this embodiment omits the hollow design for the main body portion 31 of the adapter 30 to pass through, which is beneficial to ensuring the overall structural strength of the second beam 22 and further beneficial to ensuring the overall structural strength of the box body 20.

[0090] Please refer to Figure 14 , Figure 14 which is a schematic structural diagram of the third embodiment of the adapter of the present application.

[0091] In one embodiment, the adapter 30 includes a main body portion 31, a first connecting portion 32, and a second connecting portion 33. The first connecting portion 32 is connected to at least one side of the main body portion 31 in the second direction Y. The second connecting portion 33 is connected to the side of the main body portion 31 away from the first beam 21 in the first direction X, and the main body portion 31 is connected to the second beam 22 through the second connecting portion 33. The first connecting portion 32 is connected to the side of the second connecting portion 33 close to the first beam 21, that is, the first connecting portion 32 is connected to the main body portion 31 and the second connecting portion 33 respectively. The connection manner between the adapter 30 and the first beam 21 has been elaborated in detail in the above embodiment and will not be repeated here.

[0092] The first fixing member 41 extends along the second direction Y, that is, the first fixing member 41 locks the first connection portion 32 and the first beam 21 laterally from the side. Specifically, the first sub-fixing member 411 is locked to a side of the first sub-connecting portion 321 away from the second sub-connecting portion 322 to fix the first sub-connecting portion 321 to the first beam 21, and the first sub-fixing member 411 extends along the second direction Y. The second sub-fixing member 412 is locked to a side of the second sub-connecting portion 322 away from the first sub-connecting portion 321 to fix the second sub-connecting portion 322 to the first beam 21, and the second sub-fixing member 412 extends along the second direction Y.

[0093] The difference between this embodiment and the above-mentioned embodiment is that the first sub-fixing member 411 and the second sub-fixing member 412 are staggered in the third direction Z, that is, the first sub-fixing member 411 and the second sub-fixing member 412 are distributed along the third direction Z, and at least part of the first sub-fixing member 411 and the second sub-fixing member 412 are arranged relative to each other in a direction perpendicular to the second direction Y. Specifically, in this embodiment, the first sub-fixing member 411 and the second sub-fixing member 412 are arranged relative to each other in the third direction Z. In this way, this embodiment can further reduce the size of the first connecting portion 32 in the second direction Y, and further reduce the space of the side accommodating cavity 23 occupied by the first connecting portion 32, which is conducive to improving the utilization rate of the internal space of the box body 20 to improve the energy density of the battery pack 10.

[0094] Please also read Figures 15 to 19 , Figure 15 This is a structural schematic diagram of a fifth embodiment of the present application in which the first beam and the second beam are connected via an adapter. Figure 16 yes Figure 15 A side view of the structure, Figure 17 yes Figure 16 Schematic diagram of the cross-sectional structure in the DD direction. Figure 18 yes Figure 17 The structural diagram of the E area in the middle, Figure 19 It is a structural schematic diagram of the second embodiment of the first beam of the present application.

[0095] In one embodiment, the adapter 30 includes a main body 31, a first connection portion 32, and a second connection portion 33. The first connection portion 32 is connected to at least one side of the main body 31 in the second direction Y. The second connection portion 33 is connected to a side of the main body 31 away from the first beam 21 in the first direction X, and the main body 31 is connected to the second beam 22 through the second connection portion 33. The first connection portion 32 is connected to a side of the second connection portion 33 close to the first beam 21, that is, the first connection portion 32 is connected to the main body 31 and the second connection portion 33 respectively. The connection method of the adapter 30 and the first beam 21 has been described in detail in the above embodiment, and will not be repeated here.

[0096] The first fixing member 41 extends along the second direction Y, that is, the first fixing member 41 laterally locks the first connecting portion 32 and the first beam 21 from the side. Specifically, the first sub-fixing member 411 locks to the side of the first sub-connecting portion 321 away from the second sub-connecting portion 322 to fixedly connect the first sub-connecting portion 321 and the first beam 21, and the first sub-fixing member 411 extends along the second direction Y. The second sub-fixing member 412 locks to the side of the second sub-connecting portion 322 away from the first sub-connecting portion 321 to fixedly connect the second sub-connecting portion 322 and the first beam 21, and the second sub-fixing member 412 extends along the second direction Y.

[0097] The main body portion 31 of the adapter 30 passes through the second beam 22. The second connecting portion 33 is fixed to the side of the second beam 22 away from the first beam 21 by the fourth fixing member 44. The first beam 21 and the second beam 22 are also fixedly connected by a reinforcing member 50. The reinforcing member 50 can enhance the connection strength between the first beam 21 and the second beam 22 on the basis of the adapter 30.

[0098] The difference between this embodiment and the above embodiment is that the plurality of rib plates 21a of the first beam 21 include at least two first rib plates 211 spaced apart along the third direction Z and at least two second rib plates 212 spaced apart along the second direction Y. The at least two second rib plates 212 include at least two first sub-rib plates 2121 spaced apart along the second direction Y and a second sub-rib plate 2122 located between two adjacent first sub-rib plates 2121.

[0099] The second sub-rib plate 2122 is adjacent to the first connecting portion 32, and the first fixing member 41 locks the adjacent first connecting portion 32 and the second sub-rib plate 2122. In other words, in this embodiment, the second sub-rib plate 2122 is the target rib plate. The first fixing portion 413 of the first fixing member 41 is connected to the first connecting portion 32, and the second fixing portion 414 is located on the side of the second sub-rib plate 2122 facing away from the first connecting portion 32, and the second fixing portion 414 abuts against the surface of the second sub-rib plate 2122 facing away from the first connecting portion 32. Further, the first sub-rib plate 2121 is provided with an avoidance hole, and the avoidance hole is disposed opposite to the first connecting portion 32. The avoidance hole is configured to allow the first fixing member 41 to pass through so that the first fixing member 41 locks the first connecting portion 32 and the second sub-rib plate 2122.

[0100] For example, for the example in which both sides of the main body 31 in the second direction Y are connected to the first connection part 32, the first beam 21 is provided with a first sub-rib plate 2121 and a second sub-rib plate 2122 on both sides in the second direction Y, and the first sub-rib plate 321 and the second sub-rib plate 322 are respectively adjacent to different second sub-rib plates 2122 on both sides of the first beam 21. A first avoidance hole 2123 is provided on the first sub-rib plate 2121 corresponding to the first sub-rib plate 321, and the first sub-fixing member 411 passes through the first avoidance hole 2123 and is locked to the first sub-rib plate 321 and its adjacent second sub-rib plate 2122, so as to fix the first sub-rib plate 321 to the first beam 21. The first fixing portion 413 of the first sub-fixing member 411 is connected to the first sub-connecting portion 321, and the second fixing portion 414 of the first sub-fixing member 411 is located on the side of the second sub-rib plate 2122 facing away from the first sub-connecting portion 321, and the second fixing portion 414 of the first sub-fixing member 411 abuts against the surface of the second sub-rib plate 2122 facing away from the first sub-connecting portion 321. A second avoidance hole 2124 is provided on the first sub-rib plate 2121 corresponding to the second sub-connecting portion 322, and the second sub-fixing member 412 passes through the second avoidance hole 2124 and is locked to the second sub-connecting portion 322 and the adjacent second sub-rib plate 2122, so as to fix the second sub-connecting portion 322 to the first beam 21. The first fixing portion 413 of the second sub-fixing member 412 is connected to the second sub-connecting portion 322, the second fixing portion 414 of the second sub-fixing member 412 is located on the side of the second sub-rib plate 2122 facing away from the second sub-connecting portion 322, and the second fixing portion 414 of the second sub-fixing member 412 abuts against the surface of the second sub-rib plate 2122 facing away from the second sub-connecting portion 322.

[0101] Please also read Figure 20 , Figure 20 It is a schematic diagram of the explosion structure of the sixth embodiment of the present application in which the first beam and the second beam are connected via a transition piece.

[0102] In one embodiment, the adapter 30 includes a main body 31, a first connection portion 32, and a second connection portion 33. The first connection portion 32 is connected to at least one side of the main body 31 in the second direction Y. The second connection portion 33 is connected to a side of the main body 31 away from the first beam 21 in the first direction X, and the main body 31 is connected to the second beam 22 through the second connection portion 33. The first connection portion 32 is connected to a side of the second connection portion 33 close to the first beam 21, that is, the first connection portion 32 is connected to the main body 31 and the second connection portion 33 respectively. The connection method of the adapter 30 and the first beam 21 has been described in detail in the above embodiment, and will not be repeated here.

[0103] A first avoidance hole 2123 is formed in the first sub-rib plate 2121 corresponding to the first sub-connection portion 321. The first sub-fastener 411 passes through the first avoidance hole 2123 and is locked to the first sub-connection portion 321 and its adjacent second sub-rib plate 2122 to fixedly connect the first sub-connection portion 321 to the first beam 21. A second avoidance hole 2124 is formed in the first sub-rib plate 2121 corresponding to the second sub-connection portion 322. The second sub-fastener 412 passes through the second avoidance hole 2124 and is locked to the second sub-connection portion 322 and its adjacent second sub-rib plate 2122 to fixedly connect the second sub-connection portion 322 to the first beam 21.

[0104] The difference between this embodiment and the above embodiment is that the second connection portion 33 is connected to the side of the second beam 22 close to the first beam 21. In this embodiment, the main body portion 31 of the adapter 30 does not pass through the second beam 22, and the second connection portion 33 is fixed to the side of the second beam 22 close to the first beam 21 by the fourth fastener 44. In this way, in this embodiment, the second beam 22 omits the hollow design for the main body portion 31 of the adapter 30 to pass through, which is beneficial to ensuring the overall structural strength of the second beam 22 and further beneficial to ensuring the overall structural strength of the box body 20.

[0105] The battery pack provided by the present application has been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application; at the same time, for those of ordinary skill in the art, according to the idea of the present application, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present application.

Claims

1. A battery pack, characterized in that: The battery pack has a first direction, a second direction and a third direction intersecting in pairs, and the battery pack includes: A box body, comprising a plurality of first beams and a plurality of second beams, wherein the first beams extend along the first direction, and the second beams extend along the second direction, and the plurality of first beams cooperate with the plurality of second beams to enclose a receiving cavity; A transition piece, comprising a main body and at least one first connecting portion, wherein the first connecting portion is connected to at least one side of the main body in the second direction; the main body is connected to the second beam, and the main body and / or the first connecting portion are connected to the first beam, wherein a size of the main body in the third direction is larger than a size of the first connecting portion in the third direction; and The single battery is arranged in the accommodating cavity.

2. The battery pack according to claim 1, characterized in that: The number of the first connection parts is at least two, and both sides of the main body in the second direction are connected to the first connection parts.

3. The battery pack according to claim 1, characterized in that: The adapter also includes: a second connecting portion connected to a side of the main body portion away from the first beam in the first direction, the main body portion being connected to the second beam through the second connecting portion; Wherein, the first connecting portion is connected to a side of the second connecting portion close to the first beam.

4. The battery pack according to claim 3, characterized in that: The second connecting portion is connected to a side of the second beam away from the first beam; and / or The second connecting portion is connected to a side of the second beam close to the first beam.

5. The battery pack according to any one of claims 1 to 4, characterized in that: The battery pack further comprises: A first fixing member, the first connecting portion and the first beam are fixedly connected through the first fixing member, wherein the first fixing member extends along the third direction.

6. The battery pack according to any one of claims 1 to 4, characterized in that: The battery pack further comprises: A first fixing member, the first connecting portion and the first beam are fixedly connected through the first fixing member, wherein the first fixing member extends along the second direction.

7. The battery pack according to claim 6, characterized in that: The first connection portion includes a first sub-connection portion and a second sub-connection portion, and the first sub-connection portion and the second sub-connection portion are respectively connected to two sides of the main body portion in the second direction; The first fixing member includes a first sub-fixing member and a second sub-fixing member; the first sub-fixing member is locked to a side of the first sub-connecting portion away from the second sub-connecting portion to fix the first sub-connecting portion to the first beam, and the first sub-fixing member extends along the second direction; the second sub-fixing member is locked to a side of the second sub-connecting portion away from the first sub-connecting portion to fix the second sub-connecting portion to the first beam, and the second sub-fixing member extends along the second direction.

8. The battery pack according to claim 7, characterized in that: At least a portion of the first sub-fixing member is disposed opposite to the second sub-fixing member in a direction perpendicular to the second direction.

9. The battery pack according to any one of claims 1 to 4, characterized in that: The first beam is composed of a plurality of ribs, the plurality of ribs including a target rib adjacent to the first connection portion; The battery pack further comprises: The first fixing member comprises: a first fixing portion connected to the first connecting portion; and A second fixing portion is connected to an end portion of the first fixing portion, the second fixing portion is located on a side of the target rib plate facing away from the first connection portion, and the second fixing portion abuts against a surface of the target rib plate facing away from the first connection portion, and the first fixing portion and the second fixing portion cooperate to fix the first connection portion and the target rib plate.

10. The battery pack according to any one of claims 1 to 4, characterized in that: The first beam includes at least two first ribs spaced apart along the third direction, and at least one of the first ribs is adjacent to the first connecting portion; the battery pack also includes a first fixing member, and the first fixing member is locked to the adjacent first connecting portion and the first rib.

11. The battery pack according to any one of claims 1 to 4, characterized in that: The first beam includes at least two second ribs spaced apart along the second direction, and at least one of the second ribs is adjacent to the first connecting portion; the battery pack also includes a first fixing member, and the first fixing member is locked to the adjacent first connecting portion and the second ribs.

12. The battery pack according to claim 11, characterized in that: The at least two second ribs include at least two first sub-ribs spaced apart along the second direction and a second sub-rib located between two adjacent first sub-ribs; Wherein, the second sub-rib plate is adjacent to the first connecting portion, and the first fixing member is locked to the adjacent first connecting portion and the second sub-rib plate.

13. The battery pack according to any one of claims 1 to 4, characterized in that: The battery pack further includes a reinforcement, a second fixing member and a third fixing member. The reinforcement, the first beam and the main body are fixedly connected via the second fixing member, and the reinforcement and the second beam are fixedly connected via the third fixing member.

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