Battery pack

Abstract

The utility model relates to the technical field of batteries, and discloses a battery pack which comprises a box body and battery packs, the box body comprises a box body main body and a beam body extending along a first direction, a containing cavity is arranged in the box body main body, the beam body is arranged in the containing cavity, and the battery packs comprise a first battery pack and a second battery pack. The first battery pack and the second battery pack are arranged on the two sides of the beam body in the second direction respectively. The connecting piece is arranged in the containing cavity and spans the beam body, the connecting piece comprises a first piece body, a second piece body and a buffer piece body, the first battery pack is connected with the first piece body, the second battery pack is connected with the second piece body, the first piece body and the second piece body are arranged at the two ends of the buffer piece body in the second direction respectively, and a plurality of grooves are formed in the buffer piece body; the groove extends in the first direction, and the concave extending direction of the groove is parallel to the third direction. The battery pack disclosed by the utility model not only can overcome the vibration impact on the whole battery pack, but also can overcome the stress caused by expansion, and meets the performance requirements of the battery pack.

Description

Technical Field

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

[0002] At present, for battery packs with larger sizes, a beam is provided in the box, and a hanging point is provided on the beam, which makes it difficult to electrically connect the single battery.

[0003] Moreover, for a battery pack having a beam body, the performance requirements of the connecting piece are higher. It is not only required to overcome the vibration impact of the battery pack as a whole, but also to overcome the stress caused by expansion. However, the performance of the connecting piece in the prior art can no longer meet the requirements of the battery pack. Utility Model Content

[0004] The purpose of the utility model is to provide a battery pack, wherein the connecting piece can not only overcome the vibration impact on the battery pack as a whole, but also overcome the stress caused by expansion.

[0005] In order to achieve the above object, the utility model provides a battery pack, comprising:

[0006] A box body has a first direction, a second direction and a third direction intersecting in pairs, the box body comprises a box body main body and a beam body extending along the first direction, the box body main body has a receiving cavity, and the beam body is arranged in the receiving cavity:

[0007] A battery pack is arranged in the accommodating cavity, the battery pack includes a first battery pack and a second battery pack, the first battery pack and the second battery pack are respectively arranged on both sides of the beam body along the second direction;

[0008] A connecting plate is arranged in the accommodating cavity and is located on one side of the beam body along the third direction. The connecting plate includes a first plate, a second plate and a buffer plate. The first battery group is connected to the first plate, and the second battery group is connected to the second plate. The first plate and the second plate are respectively arranged at the two ends of the buffer plate along the second direction. The buffer plate and the beam body are arranged opposite to each other along the third direction. The buffer plate has a plurality of grooves, and the grooves extend along the first direction. The concave extension direction of the grooves is parallel to the third direction.

[0009] In some embodiments of the present application:

[0010] The plurality of grooves are arranged along the second direction, and the concave extension directions of two adjacent grooves in the third direction are opposite.

[0011] In some embodiments of the present application:

[0012] The box body further includes a mounting structure, which extends along the third direction and is arranged on the beam body;

[0013] A minimum distance L between one end of the connecting piece facing the mounting structure in the first direction and an outer peripheral surface of the mounting structure satisfies: L>12 mm.

[0014] In some embodiments of the present application:

[0015] The buffer sheet is provided with a first notch at one end thereof facing the mounting structure in the first direction, and the position of the first notch corresponds to the position of the mounting structure in the first direction.

[0016] In some embodiments of the present application:

[0017] A second notch is provided on one end of the first sheet body in the first direction toward the mounting structure, and the second notch transitions to the first notch in an arc shape;

[0018] And / or, a third notch is provided at one end of the second sheet body in the first direction toward the mounting structure, and the third notch transitions to the first notch in an arc shape.

[0019] In some embodiments of the present application, the battery pack further includes:

[0020] A voltage collection member; a first avoidance groove is provided on the end surface of the first sheet body in the third direction, and the voltage collection member is at least partially accommodated in the first avoidance groove;

[0021] And / or, the end surface of the second sheet body in the third direction is provided with a second avoidance groove, and the voltage collection member is at least partially accommodated in the second avoidance groove.

[0022] In some embodiments of the present application, the battery pack further includes:

[0023] The temperature collection component; the end surface of the first sheet in the third direction is also provided with a third avoidance groove, and the temperature collection component is at least partially accommodated in the third avoidance groove.

[0024] In some embodiments of the present application:

[0025] The first sheet body and the second sheet body are each provided with a fourth avoidance groove for avoiding welding tooling on the end surface in the third direction, and a welding hole is provided in the fourth avoidance groove.

[0026] In some embodiments of the present application:

[0027] The connecting sheet has a fourth notch, and the fourth notch is located at an end of the connecting sheet away from the mounting structure along the first direction. At least a part of the fourth notch is formed by the edge of the buffer sheet body.

[0028] In some embodiments of the present application:

[0029] There are a plurality of connecting plates, which are stacked along the third direction and are all located on one side of the beam body along the third direction, and at least one connecting plate is electrically connected to the first battery pack and the second battery pack.

[0030] In some embodiments of the present application:

[0031] The connecting piece further includes a connecting section, which extends along the third direction and connects two adjacent connecting pieces.

[0032] In some embodiments of the present application:

[0033] The connecting section includes a first connecting section and a second connecting section arranged at intervals along the second direction, the first connecting section connects two adjacent first sheets along the third direction, and the second connecting section connects two adjacent second sheets along the third direction.

[0034] The utility model provides a battery pack, which has the following beneficial effects compared with the prior art:

[0035] The battery pack of the utility model includes a box body, a battery pack and a connecting piece, wherein the connecting piece can span one side of the beam body in the box body and electrically connect the batteries on both sides of the beam body. The connecting piece is provided with a buffer sheet body, and the buffer sheet body has at least two grooves, which can improve the buffering performance of the buffer sheet body, can not only overcome the vibration impact on the battery pack as a whole, but also overcome the stress caused by expansion, and meet the performance requirements of the battery pack. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the structure of a battery pack according to an embodiment of the utility model.

[0037] Figure 2 yes Figure 1 A magnified schematic diagram of center A.

[0038] Figure 3 It is a structural schematic diagram of a connecting piece according to an embodiment of the utility model.

[0039] Figure 4 It is a structural schematic diagram of the connecting piece of the embodiment of the utility model from another angle.

[0040] Figure 5 It is a structural schematic diagram of the connecting piece of the embodiment of the utility model from another angle.

[0041] Figure 6 It is a structural schematic diagram of the electrical connection plate and the connection piece in the embodiment of the utility model.

[0042] Figure 7 yes Figure 6 A magnified schematic diagram of point B in the middle.

[0043] In the figure, 1. Box body; 2. Connecting piece; 3. Electrical isolation board; 4. Voltage collection component; 5. Temperature collection component.

[0044] 11. Accommodating cavity; 12. Mounting structure; 13. Box body; 14. Beam body; 21. First sheet; 22. Second sheet; 23. Buffer sheet; 24. Groove; 25. Fourth avoidance groove; 26. First connecting sheet; 27. Second connecting sheet; 211. First avoidance groove; 212. Third avoidance groove; 213. Second notch; 221. Second avoidance groove; 222. Third notch; 231. Bend portion; 232. Straight portion; 233. First notch; 234. Fourth notch; 251. Welding hole; 261. First end; 262. Second end; 271. Third end; 272. Fourth end;

[0045] Y, first direction; X, second direction; Z, third direction. DETAILED DESCRIPTION

[0046] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0047] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0048] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0049] The term "parallel" in this application includes not only the absolute parallel situation, but also the generally parallel situation conventionally recognized in engineering, such as "parallel" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is -1° to 1°; at the same time, "vertical" also includes not only the absolute vertical situation, but also the generally vertical situation conventionally recognized in engineering, such as "vertical" refers to the state where the angle formed by a straight line, a straight line and a plane, or a plane and a plane is 89° to 91°. Equal distances or equal angles include not only the absolute equal situation, but also the generally equal situation conventionally recognized in engineering, that is, there may be a certain error, such as the state where the tolerance range is -1% to 1%.

[0050] In addition, in the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0051] For those skilled in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0052] Please refer to Figure 1 A battery pack according to a preferred embodiment of the utility model includes: a box body 1, a battery pack and a connecting piece 2.

[0053] The box body 1 has a first direction Y, a second direction X and a third direction Z intersecting in pairs. The box body 1 includes a box body body 13 and a beam body 14 extending along the first direction Y. The box body body 13 has a receiving cavity 11 therein, and the beam body 14 is arranged in the receiving cavity 11.

[0054] In this embodiment, the width direction of the box body 1 is the first direction Y, the length direction of the box body 1 is the second direction X, and there is a third direction Z, which is the height direction of the box body 1. The first direction Y, the second direction X and the third direction Z are perpendicular to each other.

[0055] The battery pack is disposed in the accommodating cavity 11 , and the battery pack includes a first battery pack and a second battery pack. The first battery pack and the second battery pack are respectively disposed on two sides of the beam body 14 along the second direction X.

[0056] The first battery group and the second battery group are only used to distinguish and describe the battery groups located on both sides of the beam body 14 . The number of single cells in the first battery group and the second battery group can be set according to the specific size of the accommodating cavity 11 on both sides of the beam body 14 .

[0057] Please refer to Figure 2 The connecting sheet 2 is arranged in the accommodating cavity 11 and is located on one side of the beam body 14 along the third direction Z. The connecting sheet 2 includes a first sheet 21, a second sheet 22 and a buffer sheet 23. The first battery group is connected to the first sheet 21, and the second battery group is connected to the second sheet 22. The first sheet 21 and the second sheet 22 are respectively arranged at the two ends of the buffer sheet 23 along the second direction X. The buffer sheet 23 and the beam body 14 are arranged opposite to each other along the third direction Z. The buffer sheet 23 has a plurality of grooves 24. The extension direction of the grooves 24 is parallel to the third direction Z, and the grooves 24 also extend along the first direction Y.

[0058] The connecting piece 2 electrically connects the first battery pack and the second battery pack on both sides of the beam body 14. For a box body 1 with a larger size, when subjected to vibration impact, the vibration frequency, position and intensity of the first battery pack and the second battery pack are quite different. As the connecting piece 2 that simultaneously connects the first battery pack and the second battery pack, stress concentration is prone to cause cracking and rupture. By providing a buffer sheet body 23, and having a plurality of grooves 24 on the buffer sheet body 23, the buffering performance of the buffer sheet body 23 can be improved, and the stress concentration of the connecting piece 2 can be alleviated, thereby not only overcoming the vibration impact on the battery pack as a whole, but also overcoming the stress caused by expansion, and meeting the performance requirements of the battery pack.

[0059] For details, please refer to Figure 3-Figure 5 The buffer sheet 23 includes a plurality of bending portions 231 sequentially arranged along the second direction X, and two adjacent bending portions 231 are arranged opposite to each other in the second direction X and form a groove 24 .

[0060] In specific implementation, the buffer sheet 23, the first sheet 21 and the second sheet 22 are integrated, the buffer sheet 23 is bent to form a bending portion 231, and two adjacent bending portions 231 form a groove 24 to realize the production and processing of the connecting sheet 2 in this embodiment.

[0061] In some embodiments, the buffer sheet 23 further includes a straight portion 232 . In the second direction X, the straight portion 232 is disposed between two adjacent bent portions 231 and connected to each other through the straight portion 232 . The two adjacent bent portions 231 and the straight portion 232 therebetween form a groove 24 .

[0062] For the groove 24 formed by two adjacent bent portions 231 and the straight portion 232 therebetween, the groove bottom of the groove 24 is straight, while for the groove 24 formed only by two adjacent bent portions 231, the groove bottom of the groove 24 is arc-shaped. In specific production implementation, the form of the groove 24 can be selected according to actual conditions.

[0063] The lengths of the first sheet 21 and the second sheet 22 in the first direction Y are both greater than the maximum length of the buffer sheet 23 in the first direction Y.

[0064] In some embodiments, the plurality of grooves 24 are arranged along the second direction X, and the concave extension directions of two adjacent grooves 24 in the third direction Z are opposite.

[0065] In this embodiment, the grooves 24 are formed by bending, and two adjacent grooves 24 with different opening directions share a bending portion 231. In other embodiments, the grooves 24 formed in other ways can also be set to have the same opening direction.

[0066] In this embodiment, three grooves 24 are provided, two grooves 24 have the same opening direction, and the third groove 24 between the two grooves has an opening direction different from that of the other two grooves 24 .

[0067] In some embodiments, the box body 1 further includes a mounting structure 12 , which extends along the third direction Z and is disposed on the beam body 14 .

[0068] The mounting structure 12 is a structure connected to a crane when the box body 1 is suspended.

[0069] A minimum distance L between one end of the connecting piece 2 facing the mounting structure 12 in the first direction Y and the outer peripheral surface of the mounting structure 12 satisfies: L>12 mm.

[0070] The connecting piece 2 needs to maintain a certain electrical clearance and creepage distance with the mounting structure 12 to ensure safety. Therefore, L>12mm needs to be set, otherwise the distance between the connecting piece 2 and the mounting structure 12 is too small, the electrical clearance and creepage distance are too small, and the electrical performance stability and safety cannot be guaranteed.

[0071] When measuring dimension L, you can use a common length measuring tool, such as a ruler or tape measure.

[0072] Specifically, when measuring L, the edge of the connecting piece 2 facing the mounting structure 12 in the first direction Y is taken as the reference edge, and the minimum distance between the reference edge and the outer surface of the mounting structure 12 is measured. The measurement is performed multiple times and the average value is taken to obtain the minimum distance L between one end of the connecting piece 2 facing the mounting structure 12 in the first direction Y and the outer peripheral surface of the mounting structure 12.

[0073] A first notch 233 is disposed at one end of the buffer sheet 23 facing the mounting structure 12 in the first direction Y. The position of the first notch 233 corresponds to the position of the mounting structure 12 in the first direction Y.

[0074] The setting of the first notch 233, on the one hand, can slightly reduce the strength of the buffer sheet 23, thereby reducing the rigidity of the buffer sheet 23 to increase the deformation ability of the buffer sheet 23, thereby improving the buffering performance; on the other hand, it can also increase the distance between the connecting sheet 2 and the mounting structure 12, which is more conducive to maintaining a certain electrical clearance and creepage distance.

[0075] In some embodiments, the minimum distance L′ between the edge of the buffer sheet 23 forming the first notch 233 and the outer peripheral surface of the mounting structure 12 satisfies: L′>12 mm.

[0076] Since the first notch 233 corresponding to the mounting structure 12 is provided, the minimum distance L between the connecting piece 2 and the mounting structure 12 is the minimum distance L′ between the edge forming the first notch 233 and the mounting structure 12. L′>12mm, a certain electrical clearance and creepage distance can be maintained to ensure electrical performance stability and safety.

[0077] When measuring the dimension L', a common length measuring tool such as a ruler or a tape measure can be used.

[0078] Specifically, when measuring L′, the edge of the first notch 233 facing the mounting structure 12 in the first direction Y is used as the reference edge, and the minimum distance between the reference edge and the outer surface of the mounting structure 12 is measured. The measurement is performed multiple times and the average value is taken to obtain the minimum distance L′ between one end of the edge forming the first notch 233 facing the mounting structure 12 in the first direction Y and the outer peripheral surface of the mounting structure 12.

[0079] Furthermore, a second notch 213 is disposed at one end of the first sheet 21 facing the mounting structure 12 in the first direction Y, and the second notch 213 and the first notch 233 are transitioned into an arc.

[0080] And / or, a third notch 222 is disposed at one end of the second sheet 22 in the first direction Y toward the mounting structure 12 , and the third notch 222 and the first notch 233 are transitioned into an arc shape.

[0081] And / or means that one of the two options is to set the second notch 213 on the first sheet 21 and the third notch 222 on the second sheet 22 , or both are acceptable.

[0082] The second notch 213 and the third notch 222 are respectively provided to reduce stress concentration at both ends of the first notch 233 in the second direction X, so as to ensure the structural stability of the connecting sheet 2 .

[0083] The battery pack also includes an electrical isolation board 3, which is used to carry the connecting piece 2, the FFC and the acquisition module to connect the battery pack, transmit data and collect relevant data such as the voltage and temperature of the battery pack or the single cell.

[0084] The connecting piece 2 is arranged on the electrical isolation plate 3 , and the connecting piece 2 and the battery pack are respectively on both sides of the electrical isolation plate 3 in the third direction Z, and the connecting piece 2 is welded to the pole of the battery pack through the opening on the electrical isolation plate 3 .

[0085] Please refer to Figure 2 The battery pack further includes a voltage collection member 4 . The end surface of the first sheet 21 in the third direction Z is provided with a first avoidance groove 211 . The voltage collection member 4 is at least partially accommodated in the first avoidance groove 211 .

[0086] And / or, the end surface of the second sheet body 22 in the third direction Z is provided with a second avoidance groove 221 , and the voltage collection member 4 is at least partially accommodated in the second avoidance groove 221 .

[0087] And / or means that one of the two options is to set the first avoidance groove 211 on the first sheet 21 and the second avoidance groove 221 on the second sheet 22, or both are acceptable.

[0088] The provision of the first avoidance groove 211 and the second avoidance groove 221 can prevent the voltage collection member 4 and the connecting piece 2 from interfering with each other, so as to more reasonably assemble the components of the battery pack.

[0089] There may be multiple voltage collecting components 4 , each of which is electrically connected to the first battery group and the second battery group to collect voltage data of the first battery group and the second battery group.

[0090] Please refer to Figure 7 The battery pack further includes a temperature collection component 5 . The end surface of the first sheet 21 in the third direction Z is further provided with a third avoidance groove 212 . The temperature collection component 5 is at least partially accommodated in the third avoidance groove 212 .

[0091] There may also be multiple temperature collecting components 5 for collecting temperature data of the first battery pack and the second battery pack.

[0092] The provision of the third avoidance groove 212 can prevent interference between the temperature collecting member 5 and the connecting piece 2, so as to more reasonably assemble the components of the battery pack.

[0093] The temperature collecting component 5 and the voltage collecting component 4 are respectively located on two sides of the electrical isolation plate 3 in the third direction Z, and are also respectively located on two sides of the connecting piece 2 in the third direction Z.

[0094] In some embodiments, the first sheet 21 and the second sheet 22 are each provided with a fourth avoidance groove 25 on the end surface in the third direction Z for avoiding welding tooling, and a welding hole 251 is provided in the fourth avoidance groove 25 .

[0095] The arrangement of the welding hole 251 can avoid the welding tool, and can facilitate the welding between the connecting piece 2 and the pole by the welding tool.

[0096] The connecting sheet 2 has a fourth notch 234 . The fourth notch 234 is located at one end of the connecting sheet 2 away from the mounting structure 12 along the first direction Y. At least a portion of the fourth notch 234 is formed by the edge of the buffer sheet 23 .

[0097] The fourth notch 234 has a similar function to the first notch 233 , which slightly reduces the strength of the buffer sheet 23 , thereby reducing the rigidity of the buffer sheet 23 to increase the deformation capacity of the buffer sheet 23 , thereby improving the buffer performance.

[0098] In some embodiments, there are multiple connecting sheets 2, and the multiple connecting sheets 2 are stacked along the third direction Z and are all located on one side of the beam body 14 along the third direction Z. At least one connecting sheet 2 is electrically connected to the first battery pack and the second battery pack. The multiple connecting sheets 2 are electrically connected to each other to achieve electrical connection between the first battery pack and the second battery pack; wherein the stacking of the multiple connecting sheets 2 can be connected through an intermediate layer or directly, and the connecting sheet 2 closest to the battery pack can be electrically connected to the battery pack.

[0099] In this embodiment, two connecting sheets 2 are provided. Compared with a single connecting sheet 2 , the connecting sheets 2 provided in this way are stronger. Combined with the structural setting of the buffer sheet body 23 , the overall structural strength of the connecting sheet 2 can also be improved.

[0100] Specifically, the connecting sheet 2 includes a first connecting sheet body 26 and a second connecting sheet body 27 , and the first connecting sheet body 26 and the second connecting sheet body 27 are stacked along the third direction Z.

[0101] In the second direction X, the portion between the two ends of the first connecting sheet body 26 and the portion between the two ends of the second connecting sheet body 27 together form a buffer sheet body 23, the two ends of the first connecting sheet body 26 are respectively recorded as the first end 261 and the second end 262, the two ends of the second connecting sheet body 27 are respectively recorded as the third end 271 and the fourth end 272, the first end 261 and the third end 271 are overlapped, the second end 262 and the fourth end 272 are overlapped, the first end 261 and the third end 271 together form the first sheet body 21, the second end 262 and the fourth end 272 together form the second sheet body 22.

[0102] In this embodiment, the first connecting sheet 26 and the second connecting sheet 27 are bent together, and the bent parts of the two together form the buffer sheet 23 .

[0103] In some embodiments, the connecting sheet 2 further includes a connecting section, which extends along the third direction Z and connects two adjacent connecting sheets 2 .

[0104] In this embodiment, two connecting sheets 2 are stacked and attached to each other to achieve connection with each other.

[0105] The connecting section includes a first connecting section and a second connecting section spaced apart along the second direction X. The first connecting section connects two adjacent first sheets 21 along the third direction Z. The second connecting section connects two adjacent second sheets 22 along the third direction Z.

[0106] Through such a structure, the two first sheets 21 are connected, and the second sheets 22 on both sides are connected, so that the two connecting sheets 2 are connected to each other.

[0107] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A battery pack, characterized in that: include: A box body (1) has a first direction (Y), a second direction (X) and a third direction (Z) intersecting in pairs, the box body (1) comprising a box body main body (13) and a beam body (14) extending along the first direction (Y), the box body main body (13) having a receiving cavity (11) therein, and the beam body (14) extending along the first direction (Y) and arranged in the receiving cavity (11): a battery pack, arranged in the accommodating cavity (11), the battery pack comprising a first battery pack and a second battery pack, the first battery pack and the second battery pack being arranged on two sides of the beam body (14) along the second direction (X) respectively; A connecting sheet (2) is arranged in the accommodating cavity (11) and is located on one side of the beam body (14) along the third direction (Z). The connecting sheet (2) comprises a first sheet body (21), a second sheet body (22) and a buffer sheet body (23). The first battery group is connected to the first sheet body (21), the second battery group is connected to the second sheet body (22), the first sheet body (21) and the second sheet body (22) are respectively connected to two ends of the buffer sheet body (23) along the second direction (X), the buffer sheet body (23) and the beam body (14) are arranged opposite to each other along the third direction (Z), and the buffer sheet body (23) has a plurality of grooves (24), the grooves (24) extend along the first direction (Y), and the concave extension direction of the grooves (24) is parallel to the third direction (Z).

2. The battery pack according to claim 1, characterized in that: The plurality of grooves (24) are arranged along the second direction (X), and the concave extension directions of two adjacent grooves (24) in the third direction (Z) are opposite.

3. The battery pack according to claim 1, characterized in that: The box body (1) further comprises a mounting structure (12), wherein the mounting structure (12) extends along the third direction (Z) and is arranged on the beam body (14); The minimum distance L between one end of the connecting piece (2) facing the mounting structure (12) in the first direction (Y) and the outer peripheral surface of the mounting structure (12) satisfies: L>12 mm.

4. The battery pack according to claim 3, characterized in that: The buffer sheet (23) is provided with a first notch (233) at one end facing the mounting structure (12) in the first direction (Y), and the position of the first notch (233) corresponds to the position of the mounting structure (12) in the first direction (Y).

5. The battery pack according to claim 4, characterized in that: The first sheet (21) is provided with a second notch (213) at one end thereof facing the mounting structure (12) in the first direction (Y), and the second notch (213) and the first notch (233) are transitioned into an arc; And / or, the second sheet (22) is provided with a third notch (222) at one end thereof in the first direction (Y) toward the mounting structure (12), and the third notch (222) and the first notch (233) are transitioned into an arc.

6. The battery pack according to claim 1, characterized in that: The battery pack further comprises: A voltage collection component (4); a first avoidance groove (211) is provided on the end surface of the first sheet (21) in the third direction (Z), and the voltage collection component (4) is at least partially accommodated in the first avoidance groove (211); And / or, the end surface of the second sheet (22) in the third direction (Z) is provided with a second avoidance groove (221), and the voltage collection component (4) is at least partially accommodated in the second avoidance groove (221).

7. The battery pack according to claim 1, characterized in that: The battery pack further comprises: A temperature collection component (5); the end surface of the first sheet (21) in the third direction (Z) is also provided with a third avoidance groove (212), and the temperature collection component (5) is at least partially accommodated in the third avoidance groove (212).

8. The battery pack according to claim 1, characterized in that: The first sheet (21) and the second sheet (22) are each provided with a fourth avoidance groove (25) for avoiding welding tooling on the end surface in the third direction (Z), and a welding hole (251) is provided in the fourth avoidance groove (25).

9. The battery pack according to claim 3, characterized in that: The connecting piece (2) has a fourth notch (234), and the fourth notch (234) is located at one end of the connecting piece (2) away from the mounting structure (12) along the first direction (Y), and at least a part of the fourth notch (234) is formed by the edge of the buffer sheet (23).

10. The battery pack according to claim 1, characterized in that: There are a plurality of the connecting sheets (2), the plurality of connecting sheets (2) are stacked along the third direction (Z) and are all located on one side of the beam body (14) along the third direction (Z), and at least one of the connecting sheets (2) is electrically connected to the first battery pack and the second battery pack.

11. The battery pack according to claim 10, characterized in that: The connecting piece (2) further comprises a connecting section, which extends along the third direction (Z) and connects two adjacent connecting pieces (2).

12. The battery pack according to claim 11, characterized in that: The connecting section comprises a first connecting section and a second connecting section which are arranged at intervals along the second direction (X), the first connecting section connecting two first sheets (21) adjacent to each other along the third direction (Z), and the second connecting section connecting two second sheets (22) adjacent to each other along the third direction (Z).

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