Battery pack and electric device

Abstract

The application provides a battery pack and an electric device. The battery pack comprises a shell, a first end plate, a second end plate, a battery module, a first reinforcing piece and a second reinforcing piece. The shell is in a U shape and comprises a bottom plate, a first side plate and a second side plate. The first end plate, the second end plate and the shell form a box body with a first opening opposite to the bottom plate. The first reinforcing piece and the second reinforcing piece are both in a U shape and are fixedly connected to the outer surface of the shell. The first reinforcing piece, the first side plate and the first end plate are sealingly connected. The second reinforcing piece, the second side plate and the second end plate are sealingly connected. The first reinforcing piece and the second reinforcing piece can increase the strength and thickness of the end region of the shell in the second direction, and can also increase the connection area and sealing area of the first end plate and the shell at one end in the second direction, and increase the connection area and sealing area of the second end plate and the shell at the other end in the second direction, thereby improving the connection strength and sealing performance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery pack and an electric device. BACKGROUND

[0002] Under the background of energy saving and emission reduction, battery packs have been widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as electric tools, unmanned aerial vehicles, energy storage devices and other fields. The battery pack provides electric energy for the electric device to perform related functions. The sealing performance of the battery pack is one of the important factors affecting the stable power supply and power supply safety of the battery pack. SUMMARY

[0003] The embodiments of the present application provide a battery pack and an electric device to improve the sealing performance of the battery pack.

[0004] The embodiments of the present application provide a battery pack, which comprises a shell, a first end plate, a second end plate, a battery module, a first reinforcing member and a second reinforcing member. The shell is U-shaped and comprises a bottom plate, a first side plate and a second side plate, and the first side plate and the second side plate are arranged opposite along a first direction. The first end plate and the second end plate are arranged opposite along a second direction, and the first end plate, the second end plate and the shell form a box body with a first opening, and the first opening is opposite to the bottom plate. The battery module is accommodated in the box body. The first reinforcing member is U-shaped and fixedly connected to the outer surface of the shell, and the first reinforcing member, the first side plate and the first end plate are sealingly connected. The second reinforcing member is U-shaped and fixedly connected to the outer surface of the shell, and the second reinforcing member, the second side plate and the second end plate are sealingly connected.

[0005] In the above technical solution, the first reinforcing member and the second reinforcing member can increase the strength and thickness of the end region of the shell in the second direction, and can also increase the connection area and sealing area of the first end plate and one end of the shell along the second direction Y, and increase the connection area and sealing area of the second end plate and the other end of the shell along the second direction Y, thereby improving the connection strength and sealing performance.

[0006] In some embodiments, the battery pack further comprises a first sealing member, the first end plate is provided with a first groove, at least part of the first sealing member is located in the first groove, and part of the first reinforcing member and the first side plate is arranged in the first groove.

[0007] In some embodiments, the battery pack further comprises a second sealing member, the second end plate is provided with a second groove, at least part of the second sealing member is located in the second groove, and part of the second reinforcing member and the second side plate is arranged in the first groove.

[0008] In some embodiments, the first reinforcing member is provided with a first clamping groove, the first end plate comprises a first end plate body and a first clamping portion, the first clamping portion is arranged at the edge of the first end plate body, and the first clamping portion is clamped in the first clamping groove.

[0009] In some embodiments, an angle exists between the extension direction of the first clamping groove and the second direction.

[0010] In some embodiments, the first clamping portion comprises a first limiting plate and a first protrusion, the first limiting plate is connected to the edge of the first end plate body and is located on the side of the first reinforcing member away from the battery module along the first direction, and the first protrusion is protruded from the surface of the first limiting plate facing the first reinforcing member and clamped in the first clamping groove.

[0011] In some embodiments, a plurality of first fixing holes are arranged on the first end plate, second fixing holes are arranged on the first side plate and / or the first reinforcing member, third fixing holes are arranged on the second side plate and / or the first reinforcing member, and the second fixing holes and the third fixing holes are respectively connected with the plurality of first fixing holes through first connecting members.

[0012] In some embodiments, along the third direction, the second fixing holes and the third fixing holes are closer to the first opening relative to the first clamping groove.

[0013] In some embodiments, the second reinforcing member is provided with a second clamping groove, the second end plate comprises a second end plate body and a second clamping portion, the second clamping portion is arranged at the edge of the second end plate body, and the second clamping portion is clamped in the second clamping groove.

[0014] In some embodiments, an angle exists between the extension direction of the second clamping groove and the second direction.

[0015] In some embodiments, the second clamping portion comprises a second limiting plate and a second protrusion, the second limiting plate is connected to the edge of the second end plate body and is located on the side of the second reinforcing member away from the battery module along the first direction, and the second protrusion is protruded from the surface of the second limiting plate facing the second reinforcing member and clamped in the second clamping groove.

[0016] In some embodiments, a plurality of fourth fixing holes are arranged on the second end plate, fifth fixing holes are arranged on the first side plate and / or the second reinforcing member, sixth fixing holes are arranged on the second side plate and / or the second reinforcing member, and the fifth fixing holes and the sixth fixing holes are respectively connected with the plurality of fourth fixing holes through second connecting members.

[0017] In some embodiments, along the third direction, the fifth fixing hole and the sixth fixing hole are closer to the second clamping groove than the first opening.

[0018] In some embodiments, along the first direction, the thickness of the first side plate ranges from 0.5mm to 1.8mm, and the thickness of the second side plate ranges from 0.5mm to 1.8mm.

[0019] In some embodiments, the battery module is located between the first side plate and the second side plate, the battery module includes a plurality of battery cells, along the first direction, there is a first gap between the first side plate and the battery module; the battery pack further includes a first heat-conducting member arranged in the first gap, and the battery module and the first side plate are connected through the first heat-conducting member; the first side plate and the second side plate are configured to move away from each other under the action of an external force to place the battery module in the shell.

[0020] In some embodiments, along the first direction, the length of the first gap ranges from 0.05mm to 2.5mm.

[0021] In some embodiments, along the first direction, there is a second gap between the second side plate and the battery module; the battery pack further includes a second heat-conducting member arranged in the second gap.

[0022] In some embodiments, along the first direction, the length of the second gap ranges from 0.05mm to 2.5mm.

[0023] In some embodiments, the battery pack further includes a cover body covering the first opening; the first end plate is provided with a seventh fixing hole, the second end plate is provided with an eighth fixing hole, and the cover body is provided with a plurality of ninth fixing holes, a part of the plurality of ninth fixing holes being connected with the seventh fixing hole through a third connecting member, and another part of the plurality of ninth fixing holes being connected with the eighth fixing hole through a fourth connecting member.

[0024] In some embodiments, the first end plate includes a first end plate body, a first connecting protrusion and a second connecting protrusion, the first connecting protrusion and the second connecting protrusion are both connected to the edge of the first end plate body and are arranged at intervals along the first direction, and the first connecting protrusion and the second connecting protrusion both protrude in a direction away from the battery module; the first connecting protrusion is provided with the seventh fixing hole, the second connecting protrusion is provided with the seventh fixing hole, the first connecting protrusion is further provided with a first fixing hole for connecting with the first reinforcing member and / or the first side plate, and the second connecting protrusion is further provided with the first fixing hole for connecting with the first reinforcing member and / or the second side plate.

[0025] In some embodiments, the second end plate includes a second end plate body, a third connecting protrusion, and a fourth connecting protrusion. The third connecting protrusion and the fourth connecting protrusion are both connected to the edge of the second end plate body and are arranged at intervals along the first direction. The third connecting protrusion and the fourth connecting protrusion both protrude in a direction away from the battery module. The third connecting protrusion is provided with the eighth fixing hole, and the fourth connecting protrusion is provided with the eighth fixing hole. The third connecting protrusion is also provided with the fourth fixing hole for connecting with the second reinforcing member and / or the first side plate, and the fourth connecting protrusion is also provided with the fourth fixing hole for connecting with the second reinforcing member and / or the second side plate.

[0026] This application also provides an electrical device, including the battery pack provided in any embodiment of the first aspect.

[0027] In the above technical solution, the battery pack in the first aspect embodiment has good sealing performance and connection strength, which is beneficial to improving the electrical safety of electrical equipment equipped with the battery pack. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation on the scope.

[0029] Figure 1 This is a schematic diagram of the structure of a battery pack provided in some embodiments of this application;

[0030] Figure 2 Exploded views of a battery pack provided in some embodiments of this application;

[0031] Figure 3 This is a schematic diagram of a battery module provided for some embodiments of this application;

[0032] Figure 4 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0033] Figure 5 This is a schematic diagram of the structure of a battery module provided in other embodiments of this application;

[0034] Figure 6 for Figure 5 A view of the battery module along the first direction;

[0035] Figure 7 This is a schematic diagram of the structure of the third heat-conducting element provided in some embodiments of this application;

[0036] Figure 8A schematic view of a battery module provided with a third heat conducting member for some embodiments of the present application (without the first heat conducting member and the second heat conducting member) accommodated in a housing;

[0037] Figure 9 A schematic view of a battery module provided with a third heat conducting member for some embodiments of the present application (without the first heat conducting member and the second heat conducting member) accommodated in a housing; Figure 8 An enlarged view of B1 in FIG. 1;

[0038] Figure 10 A schematic view of a battery module provided with a third heat conducting member for some embodiments of the present application (without the first heat conducting member and the second heat conducting member) accommodated in a housing; Figure 8 An enlarged view of B2 in FIG. 2;

[0039] Figure 11 A schematic view of a battery module provided with a third heat conducting member for some embodiments of the present application (without the first heat conducting member and the second heat conducting member) accommodated in a housing; Figure 10 An enlarged view of B3 in FIG. 3;

[0040] Figure 12 A schematic view of a battery module provided with a third heat conducting member for some embodiments of the present application (without the first heat conducting member and the second heat conducting member) accommodated in a housing;

[0041] Figure 13 A schematic view of a battery module provided with a third heat conducting member for some embodiments of the present application (without the first heat conducting member and the second heat conducting member) accommodated in a housing; Figure 12 An enlarged view of B4 in FIG. 4;

[0042] Figure 14 A schematic view of a battery module provided with a third heat conducting member for some embodiments of the present application (without the first heat conducting member and the second heat conducting member) accommodated in a housing; Figure 12 An enlarged view of C1 in FIG. 5;

[0043] Figure 15 A schematic view of a battery module provided with a third heat conducting member for some embodiments of the present application (without the first heat conducting member and the second heat conducting member) accommodated in a housing; Figure 14 An enlarged view of C2 in FIG. 6;

[0044] Figure 16 A schematic view of a battery module provided with a third heat conducting member for some embodiments of the present application (without the first heat conducting member and the second heat conducting member) accommodated in a housing; Figure 8 An enlarged view of C3 in FIG. 7;

[0045] Figure 17 A schematic view of a battery module provided with a third heat conducting member for some embodiments of the present application (without the first heat conducting member and the second heat conducting member) accommodated in a housing; Figure 10 An enlarged view of C4 in FIG. 8;

[0046] Figure 18 A schematic view of a battery module provided with a third heat conducting member for some embodiments of the present application (without the first heat conducting member and the second heat conducting member) accommodated in a housing; Figure 12 An enlarged view of D1 in FIG. 9;

[0047] Figure 19 A schematic view of a battery module provided with a third heat conducting member for some embodiments of the present application (without the first heat conducting member and the second heat conducting member) accommodated in a housing; Figure 14 An enlarged view of D2 in FIG. 10;

[0048] Figure 20 A schematic view of a battery module provided with a third heat conducting member for some embodiments of the present application (without the first heat conducting member and the second heat conducting member) accommodated in a housing;

[0049] Figure 21 A schematic view of a battery module provided with a third heat conducting member for some embodiments of the present application (without the first heat conducting member and the second heat conducting member) accommodated in a housing; Figure 20 An assembled view of the housing, the first reinforcing member and the second reinforcing member for some embodiments of the present application;

[0050] Figure 22Fig. 1 is a perspective view of a battery pack according to some embodiments of the present application;

[0051] Figure 23 Fig. 2 is a perspective view of a battery pack according to some embodiments of the present application;

[0052] Figure 24 Fig. 3 is a view of a battery pack according to some embodiments of the present application, as viewed from the second opening direction after assembly of the shell, the first stiffener and the second stiffener;

[0053] Figure 25 Fig. 4 is a perspective view of a battery pack according to some embodiments of the present application; Figure 23 Fig. 5 is an enlarged view of D1 in Fig. 4;

[0054] Figure 26 Fig. 6 is a perspective view of a battery pack according to some embodiments of the present application; Figure 23 Fig. 7 is an enlarged view of D2 in Fig. 6;

[0055] Figure 27 Fig. 8 is a perspective view of a battery pack according to some embodiments of the present application;

[0056] Figure 28 Fig. 9 is an enlarged view of E1 in Fig. 8; Figure 27

[0057] Fig. 10 is a perspective view of a battery pack according to some embodiments of the present application; Figure 29 Fig. 11 is an enlarged view of E2 in Fig. 10; Figure 27

[0058] Fig. 12 is a perspective view of a battery pack according to some embodiments of the present application; Figure 30 Fig. 13 is an enlarged view of B5 in Fig. 12;

[0059] Figure 31 Fig. 14 is a perspective view of a battery pack according to some embodiments of the present application; Figure 8 Fig. 15 is an enlarged view of B6 in Fig. 14;

[0060] Figure 32 Fig. 16 is a perspective view of a battery pack according to some embodiments of the present application; Figure 8 Fig. 17 is an enlarged view of B7 in Fig. 16;

[0061] Figure 33 Fig. 18 is a perspective view of a battery pack according to some embodiments of the present application; Fig. 19 is an enlarged view of F1 in Fig. 18;

[0062] Figure 34 Fig. 20 is a perspective view of a battery pack according to some embodiments of the present application;

[0063] Figure 35 Fig. 21 is a perspective view of a battery pack according to some embodiments of the present application;

[0064] Figure 36 Fig. 22 is a perspective view of a battery pack according to some embodiments of the present application; Figure 35 Fig. 23 is an enlarged view of F2 in Fig. 22;

[0065] Figure 37 Fig. 24 is a perspective view of a battery pack according to some embodiments of the present application;

[0066] Figure 38 Assembled view of the housing, the first heat dissipation fins and the second heat dissipation fins provided for some embodiments of the present application;

[0067] Figure 39 Exploded view of the battery pack provided for some embodiments of the present application;

[0068] Figure 40 Structure view of the bracket in Figure 2 ;

[0069] Figure 41 Another view of the bracket in Figure 2 ;

[0070] Figure 42 View of the bracket along the third direction provided for some embodiments of the present application;

[0071] Figure 43 View of the bracket along the first direction provided for some embodiments of the present application;

[0072] Figure 44 View of the battery module along the first direction provided for some embodiments of the present application;

[0073] Figure 45 Enlarged view of G1 in Figure 41 ;

[0074] Figure 46 View of the battery pack along the second direction provided for some embodiments of the present application;

[0075] Figure 47 Sectional view along P-P in Figure 46 ;

[0076] Figure 48 Enlarged view of J1 in Figure 47 ;

[0077] Figure 49 Enlarged view of J2 in Figure 47 ;

[0078] Figure 50 Enlarged view of K1 in Figure 30 ;

[0079] Figure 51 Flow chart of the manufacturing method of the battery pack provided for some embodiments of the present application;

[0080] Figure 52 Comparison view before and after applying external force to the housing.

[0081] Icon: 100 - battery pack; 10 - shell; 11 - bottom plate; 12 - first side plate; 121 - inner surface of first side plate; 122 - outer surface of first side plate; 123 - second threaded hole; 124 - fifth threaded hole; 125 - first protrusion; 1251 - first circular arc surface; 126 - first recess; 127 - first through hole; 128 - first side plate opening; 129 - thirteenth threaded hole; 13 - second side plate; 131 - inner surface of second side plate; 132 - outer surface of second side plate; 133 - third threaded hole; 134 - sixth threaded hole; 135 - second protrusion; 1351 - second circular arc surface; 136 - second recess; 137 - second through hole; 138 - second side plate opening; 139 - fourteenth threaded hole; 14 - second opening; 15 - third opening; 16 - fourth opening; 20 - battery module; 21 - battery cell; 22 - first buffer; 23 - packaging bag; 231 - sealing part; 2310 - first space; 2311 - first sealing part; 2312 - second sealing part; 2313 - third sealing part; 232 - packaging body; 25 - tab; 24a - positive tab; 24b - negative tab; 26 - first circuit board; 261 - total positive electrode; 262 - total negative electrode; 27 - third heat conduction piece; 271 - bottom wall; 272 - side wall; 2721 - first side wall; 2722 - second side wall; 2723 - third side wall; 273 - notch; 274 - fifth opening; 28 - second buffer; 30 - first heat conduction piece; 50 - second heat conduction piece; 60 - first reinforcing piece; 61 - first reinforcing part; 62 - second reinforcing part; 63 - third reinforcing part; 64 - first clamping groove; 70 - second reinforcing piece; 71 - fourth reinforcing part; 72 - fifth reinforcing part; 73 - sixth reinforcing part; 74 - second clamping groove; 80 - first end plate; 81 - first threaded hole; 82 - first end plate body; 83 - first clamping part; 831 - first limiting plate; 832 - first protruding part; 84 - first fin part; 85 - first groove; 86 - seventh threaded hole; 90 - second end plate; 91 - fourth threaded hole; 92 - second end plate body; 93 - second clamping part; 931 - second limiting plate; 932 - second protruding part; 94 - second fin part; 96 - eighth threaded hole; 110 - cover body; 1101 - ninth threaded hole; 1102 - fourth groove; 120 - second circuit board; 130 - first heat dissipation fin; 1301 - first heat dissipation fin part; 140 - second heat dissipation fin; 1401 - second heat dissipation fin part; 150 - bracket; 1501 - tenth threaded hole; 1502 - first surface; 1503 - second surface; 1504 - protrusion; 1505 - accommodating part; 1506 - reinforcing rib; 1507 - connecting column; 15071 - eleventh threaded hole; 1508 - twelfth threaded hole; 1509 - third groove; 1510 - limiting part; 1511 - third through hole; A1 - first gap; A2 - second gap; Q - box body; Q1 - first opening; D1 - first adhesiveD2 - Second Gel; W1 - First Seal; W2 - Second Seal; X - First Direction; Y - Second Direction; Z - Third Direction DETAILED DESCRIPTION

[0082] In order to make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the accompanying drawings for the embodiments of the present application to make a clear and complete description of the technical solutions 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 of the present application. The components of the embodiments of the present application described and shown in the accompanying drawings can be arranged and designed in various different configurations.

[0083] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application.

[0084] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0085] It should be noted that: similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0086] In the description of the embodiments of the present application, it should be noted that the indicated position or location relationship is based on the position or location relationship shown in the drawings, or the position or location relationship commonly placed when the product of the present application is used, or the position or location relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular position, be constructed and operated in a particular position, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for differentiation in description, and cannot be understood as indicating or implying relative importance.

[0087] At present, from the development of market situation, the battery pack has been widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, as well as electric tools, unmanned aerial vehicles, energy storage equipment and many other fields. With the continuous expansion of the field of battery pack, the demand of its market is also increasing.

[0088] The development of battery technology needs to consider many design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, whether the battery can be normally charged and discharged with the change of environmental conditions and / or internal conditions of the battery is also one of the key factors to be considered.

[0089] The inventor finds that the first end plate and the second end plate of the battery pack, and the small sealing area and the small connecting area of the two ends of the U-shaped shell, cause the poor sealing and the insufficient connecting strength between the first end plate and the shell, and between the second end plate and the shell, which affects the stability and safety of the battery pack.

[0090] Based on the above considerations, in order to improve the sealing performance of the battery pack, the application provides a battery pack, which comprises a shell, a first end plate, a second end plate, a battery module, a first reinforcing member and a second reinforcing member. The shell is in a U shape and comprises a bottom plate, a first side plate and a second side plate. The first side plate and the second side plate are oppositely arranged along a first direction. The first end plate and the second end plate are oppositely arranged along a second direction. The first end plate, the second end plate and the shell form a box body with a first opening. The first opening is opposite to the bottom plate. The battery module is accommodated in the box body. The first reinforcing member is in a U shape and is fixedly connected to the outer surface of the shell. The first reinforcing member, the first side plate and the first end plate are sealingly connected. The second reinforcing member is in a U shape and is fixedly connected to the outer surface of the shell. The second reinforcing member, the second side plate and the second end plate are sealingly connected.

[0091] The arrangement of the first reinforcing member and the second reinforcing member can increase the strength and thickness of the end region of the shell in the second direction, and can also increase the connecting area and the sealing area of one end of the first end plate and the shell along the second direction Y, and increase the connecting area and the sealing area of the other end of the second end plate and the shell along the second direction Y, thereby improving the connecting strength and the sealing performance.

[0092] The battery pack disclosed in the application can be used in electric two-wheeled vehicles, electric tools, unmanned aerial vehicles, energy storage devices and other electric equipment, but is not limited thereto. The battery pack provided by the application can also be used as a power supply system of electric equipment, which is conducive to improving the heat dissipation capacity of the charging and discharging process of the power supply system and the electrical safety of the electric equipment.

[0093] The application provides an electric equipment using a battery pack as a power supply. The electric equipment can be, but is not limited to, electronic equipment, electric tools, electric vehicles, unmanned aerial vehicles and energy storage devices. The electronic equipment can include mobile phones, tablets, notebook computers and the like. The electric tools can include electric drills, electric saws and the like. The electric vehicles can include electric cars, electric motorcycles and electric bicycles.

[0094] As Figure 1 , Figure 2As shown, the battery pack 100 comprises a shell 10, a first end plate 80, a second end plate 90, a first reinforcing member 60 and a second reinforcing member 70. The shell 10 is in a U shape, and comprises a bottom plate 11, a first side plate 12 and a second side plate 13, which are oppositely arranged along a first direction X. The first end plate 80 and the second end plate 90 are oppositely arranged along a second direction Y, and the first end plate 80, the second end plate 90 and the shell 10 form a box Q with a first opening Q1 opposite to the bottom plate 11. The battery module 20 is accommodated in the box Q. The first reinforcing member 60 is in a U shape, and is fixedly connected to the outer surface of the shell 10. The first reinforcing member 60, the first side plate 12 and the first end plate 80 are sealingly connected. The second reinforcing member 70 is in a U shape, and is fixedly connected to the outer surface of the shell 10. The second reinforcing member 70, the second side plate 13 and the second end plate 90 are sealingly connected.

[0095] The first reinforcing member 60 and the second reinforcing member 70 can increase the strength and thickness of the end region of the shell 10 along the second direction Y, and can increase the connection area and sealing area of the first end plate 80 and the shell 10 at one end along the second direction Y, and increase the connection area and sealing area of the second end plate 90 and the shell 10 at the other end along the second direction Y, thereby improving the connection strength and sealing performance.

[0096] In some embodiments, a first sealing member W1 (shown in Figure 2 FIG. 2) is arranged between the end of the shell 10 along the second direction Y and the first end plate 80; and a second sealing member W2 (shown in Figure 2 FIG. 3) is arranged between the other end of the shell 10 along the second direction Y and the second end plate 90.

[0097] The first sealing member W1 and the second sealing member W2 can improve the sealing performance of the battery pack 100, reduce the risk of impurities from the external environment entering the inside of the battery pack 100, and be conducive to prolonging the service life and improving the safety performance of the battery pack 100.

[0098] The first sealing member W1 and the second sealing member W2 can be solid rubber pads. The first sealing member can also be formed by curing sealing glue coated between the end of the shell 10 along the second direction Y and the first end plate 80. In this embodiment, the cured sealing glue can also serve to connect the first end plate 80 and the shell 10. The second sealing member W2 can also be formed by curing sealing glue coated between the other end of the shell 10 along the second direction Y and the second end plate 90. In this embodiment, the cured sealing glue can also serve to connect the second end plate 90 and the shell 10.

[0099] As Figure 20 , Figure 21As shown, in some embodiments, the housing 10 is provided with a first reinforcing member 60 at an end thereof in the second direction Y. The first reinforcing member 60 is arranged to increase the strength and thickness of the end region of the housing 10 in the second direction Y, increase the connection area and sealing area of the first end plate 80 and the end of the housing 10 in the second direction Y, and improve the connection strength and sealing performance.

[0100] The first reinforcing member 60 is arranged on the outer surface of the end of the housing 10 in the second direction Y. The first reinforcing member 60 covers a part of the first side plate 12, and the first reinforcing member 60 covers a part of the second side plate 13. The end of the first reinforcing member 60 in the second direction Y can be flush with the end face of the housing 10 in the third direction Z.

[0101] The first reinforcing member 60 can be fixedly connected to the housing 10, such as welded connection, adhesive connection, etc. The first reinforcing member 60 can also be detachably connected to the housing 10, such as bolt connection, screw connection, etc. The material of the first reinforcing member 60 and the material of the housing 10 can be the same or different.

[0102] Please continue to refer to Figure 20 , Figure 21 In some embodiments, the first reinforcing member 60 is in a U shape, and the first reinforcing member 60 is fixedly connected to the outer surface of the housing 10. The first reinforcing member 60 includes a first reinforcing portion 61, a second reinforcing portion 62, and a third reinforcing portion 63, the first reinforcing portion 61 and the second reinforcing portion 62 are connected through the third reinforcing portion 63, and together form the U-shaped first reinforcing member 60. The first reinforcing portion 61 is fixedly connected to the outer surface 122 of the first side plate, such as the first reinforcing portion 61 being welded to the outer surface 122 of the first side plate. The second reinforcing portion 62 is fixedly connected to the outer surface 132 of the second side plate, such as the second reinforcing portion 62 being welded to the outer surface 132 of the second side plate. The third reinforcing portion 63 is fixedly connected to the outer surface of the bottom plate 11, such as the third reinforcing portion 63 being welded to the outer surface of the bottom plate 11.

[0103] In some embodiments, the housing 10 is provided with a second reinforcing member 70 at the other end thereof in the second direction Y, and the second reinforcing member 70 is arranged in the second direction Y spaced apart from the first reinforcing member 60. The second reinforcing member 70 is arranged to increase the strength and thickness of the end region of the housing 10 in the second direction Y, increase the connection area and sealing area of the first end plate 80 and the end of the housing 10 in the second direction Y, and improve the connection strength and sealing performance.

[0104] The second reinforcing member 70 is arranged on the outer surface of the other end of the housing 10 in the second direction Y. The second reinforcing member 70 covers a part of the first side plate 12, and the second reinforcing member 70 covers a part of the second side plate 13. The end of the second reinforcing member 70 in the second direction Y away from the first reinforcing member 60 can be flush with the end face of the housing 10 in the third direction Z.

[0105] The second reinforcing member 70 can be fixedly connected with the shell 10, such as welded connection, adhesive connection, etc. The second reinforcing member 70 can also be detachably connected with the shell 10, such as bolt connection, screw connection, etc. The material of the second reinforcing member 70 and the material of the shell 10 can be the same or different.

[0106] Please continue to refer to Figure 20 , Figure 21 In some embodiments, the second reinforcing member 70 is U-shaped, and the second reinforcing member 70 is fixedly connected to the outer surface of the shell 10. The second reinforcing member 70 includes a fourth reinforcing portion 71, a fifth reinforcing portion 72, and a sixth reinforcing portion 73. The fourth reinforcing portion 71 and the fifth reinforcing portion 72 are connected through the sixth reinforcing portion 73, and together form the U-shaped second reinforcing member 70. The fourth reinforcing portion 71 is fixedly connected to the outer surface 122 of the first side plate, such as the fourth reinforcing portion 71 being welded to the outer surface 122 of the first side plate. The fifth reinforcing portion 72 is fixedly connected to the outer surface 132 of the second side plate, such as the fifth reinforcing portion 72 being welded to the outer surface 132 of the second side plate. The sixth reinforcing portion 73 is fixedly connected to the outer surface of the bottom plate 11, such as the sixth reinforcing portion 73 being welded to the outer surface of the bottom plate 11.

[0107] The outer surface 122 of the first side plate is a surface of the first side plate 12 facing away from the battery module 20 along the first direction X, and the outer surface 122 of the first side plate is arranged opposite to the inner surface 121 of the first side plate. The outer surface 132 of the second side plate is a surface of the second side plate 13 facing away from the battery module 20 along the first direction X, and the outer surface 132 of the second side plate is arranged opposite to the inner surface 131 of the second side plate. The outer surface of the bottom plate 11 is a surface of the bottom plate 11 facing away from the battery module 20 along the third direction Z, and the outer surface of the bottom plate 11 is arranged opposite to the inner surface of the bottom plate 11.

[0108] As shown in Figure 29 In some embodiments, a first recess 85 is formed on the surface of the first end plate 80 facing the shell 10, the first recess 85 is arranged along the edge of the first end plate 80, and the first sealing member W1 is arranged in the first recess 85.

[0109] The first sealing member W1 is arranged in the first recess 85, which can be understood as the first sealing member W1 being embedded in the first end plate 80. The first sealing member W1 and the first end plate 80 share a part of the space, which not only provides sealing performance, but also helps to reduce the volume of the battery pack 100, thereby facilitating the miniaturization of the structure of the battery pack 100.

[0110] Specifically, the first groove 85 is arranged at the edge of the first end plate body 82. The first groove 85 extends along the edge of the first end plate 80, and the extension trajectory of the first groove 85 is in a U shape along the extension direction of the first groove 85, so as to match the shape of the end portion of the shell 10 along the second direction Y.

[0111] The first sealing member W1 is arranged in the first groove 85, that is, the first sealing member W1 is accommodated in the first groove 85. The first sealing member W1 can be fully accommodated in the first groove 85 or partially accommodated in the first groove 85.

[0112] In some embodiments, the surface of the second end plate 90 facing the shell 10 is formed with a second groove (not shown in the figure), the second groove is arranged along the edge of the second end plate 90, and the second sealing member W2 is arranged in the second groove. The arrangement of the second groove can refer to the arrangement of the first groove 85.

[0113] The second sealing member W2 is arranged in the first groove 85, which can be understood as that the second sealing member W2 is accommodated in the second end plate 90, and the second sealing member W2 and the second end plate 90 share a part of the space, which can not only improve the sealing performance, but also be beneficial to reduce the volume of the battery pack 100, thereby being beneficial to realize the miniaturization of the structure of the battery pack 100.

[0114] Specifically, the second groove is arranged at the edge of the second end plate body 92. The second groove extends along the edge of the first end plate 80, and the extension trajectory of the second groove is in a U shape along the extension direction of the second groove, so as to match the shape of the end portion of the shell 10 along the second direction Y.

[0115] The second sealing member W2 is arranged in the second groove, which can be understood as that the second sealing member W2 is accommodated in the second groove. The second sealing member can be fully accommodated in the second groove or partially accommodated in the first groove 85.

[0116] In other embodiments, the first end plate 80 can also not be provided with the first groove 85, and the first sealing member W1 abuts between the surface of the first end plate 80 facing the shell 10 and the end portion of the shell 10 along the second direction Y. The second end plate 90 can also not be provided with the second groove, and the second sealing member W2 abuts between the surface of the second end plate 90 facing the shell 10 and the end portion of the shell 10 along the second direction Y, so as to simplify the structure of the first end plate 80 and the second end plate 90.

[0117] As Figures 22-26As shown, the first reinforcing member 60 is provided with the first clamping groove 64, the first end plate 80 comprises a first end plate body 82 and a first clamping portion 83, the first clamping portion 83 is arranged at the edge of the first end plate body 82, and the first clamping portion 83 is clamped in the first clamping groove 64. The first clamping portion 83 of the first end plate 80 is clamped in the first clamping groove 64 of the first reinforcing member 60, so that the first end plate 80 and the shell 10 are accurately positioned, thereby facilitating the stable connection of the first end plate 80 and the shell 10.

[0118] In some embodiments, along the third direction Z, the second threaded hole 123 and the third threaded hole 133 are closer to the first opening Q1 relative to the first clamping groove 64, which is conducive to the recovery of the first side plate 12 and the second side plate 13.

[0119] The first clamping groove 64 is arranged on the surface of the first reinforcing member 60 away from the shell 10, and the first clamping groove 64 can extend to the end face of the first reinforcing member 60 flush with the shell 10 along the second direction Y, so as to form a first notch on the end face of the first reinforcing member 60 along the second direction Y. Figure 24 As shown, the surface of the first reinforcing portion 61 away from the first side plate 12 and the surface of the second reinforcing portion 62 away from the second side plate 13 are both provided with the first clamping groove 64. The first clamping groove 64 and the second direction Y form a first angle a1 (as shown in the middle) Figure 25 As shown in the middle), the first angle a1 is an acute angle, so that the first clamping portion 83 and the first clamping groove 64 can be more stable after cooperation.

[0120] Each first reinforcing portion 61 is provided with a plurality of first clamping grooves 64 along the third direction Z, and each second reinforcing portion 62 is provided with a plurality of first clamping grooves 64 along the third direction Z. Of course, one first clamping groove 64 can also be arranged on the first reinforcing portion 61, and one first clamping groove 64 can also be arranged on the second reinforcing portion 62.

[0121] The surface of the third reinforcing portion 63 away from the bottom plate 11 can be provided with the first clamping groove 64, or can not be provided with the first clamping groove 64.

[0122] In some embodiments, the first reinforcing member 60 is used to set the position of the first clamping groove 64, and before the first clamping groove 64 is set, the thickness thereof in the direction away from the battery module 20 is greater than the thickness of other positions of the first reinforcing member 60 in the direction away from the battery module 20, so as to compensate for the thickness reduction of the corresponding position of the first reinforcing member 60 caused by the first clamping groove 64, and alleviate the problem that the setting of the first clamping groove 64 reduces the strength of the first reinforcing member 60. Of course, the first reinforcing member 60 can also be an equal-thickness structure.

[0123] As shown in the middle Figures 22-26As shown, in the embodiment in which the first and second reinforcing members 60 and 70 are arranged at both ends of the shell 10 along the second direction Y, the second reinforcing member 70 is provided with a second clamping groove 74, and the second end plate 90 includes a second end plate body 92 and a second clamping portion 93 arranged at the edge of the second end plate body 92, and the second clamping portion 93 is clamped in the second clamping groove 74. The second clamping portion 93 of the second end plate 90 is clamped in the second clamping groove 74 of the second reinforcing member 70, so that the second end plate 90 and the shell 10 are accurately positioned, thereby facilitating the stable connection of the second end plate 90 and the shell 10.

[0124] In some embodiments, along the third direction Z, the fifth threaded hole 124 and the sixth threaded hole 134 are closer to the first opening Q1 than the second clamping groove 74, which facilitates the recovery of the first side plate 12 and the second side plate 13.

[0125] As shown, Figure 23 , Figure 26 The second clamping groove 74 is arranged on the surface of the second reinforcing member 70 facing away from the shell 10, and the second clamping groove 74 can extend to the end face of the second reinforcing member 70 flush with the shell 10 along the second direction Y, so as to form a second notch on the end face of the second reinforcing member 70 along the second direction Y. The surface of the fourth reinforcing portion 71 facing away from the first side plate 12 and the surface of the fifth reinforcing portion 72 facing away from the second side plate 13 are both provided with the second clamping groove 74. There is a second angle a2 between the second clamping groove 74 and the second direction Y (as shown in Figure 26 ), and the second angle a2 is obtuse, so that the second clamping portion 93 and the second clamping groove 74 can be more stable after cooperation.

[0126] Each fourth reinforcing portion 71 is provided with a plurality of second clamping grooves 74 spaced apart along the third direction Z, and each fifth reinforcing portion 72 is provided with a plurality of second clamping grooves 74 spaced apart along the third direction Z. Of course, one second clamping groove 74 can also be arranged on the fourth reinforcing portion 71, and one second clamping groove 74 can also be arranged on the fifth reinforcing portion 72.

[0127] The surface of the sixth reinforcing portion 73 facing away from the bottom plate 11 can be provided with a second clamping groove 74, or can not be provided with a second clamping groove 74.

[0128] Similar to the first reinforcing member 60, in some embodiments, the second reinforcing member 70 is used to arrange the position of the second clamping groove 74, and before the second clamping groove 74 is arranged, the thickness of the second reinforcing member 70 in the direction away from the battery module 20 is greater than the thickness of the second reinforcing member 70 at other positions in the direction away from the battery module 20, so as to compensate for the thickness reduction of the corresponding position of the second reinforcing member 70 caused by the opening of the second clamping groove 74 on the second reinforcing member 70, and to alleviate the problem that the arrangement of the second clamping groove 74 reduces the strength of the second reinforcing member 70. Of course, the second reinforcing member 70 can also be an equal-thickness structure.

[0129] AsFigure 22 The first end plate body 82 is a part of the first end plate 80 opposite to the housing 10 in the second direction Y. The first end plate body 82 covers the second opening 14 of the housing 10 in the second direction Y. The first end plate body 82 and the first clamping portion 83 can be integrally formed or separately arranged and connected as a whole structure. The first clamping portion 83 can enter the first clamping groove 64 from the first slot of the end surface of the first reinforcing member 60 in the second direction Y. The first clamping portion 83 can be partially clamped in the first clamping groove 64 or fully clamped in the first clamping groove 64. In the second direction Y, the side of the first end plate body 82 away from the battery module 20 has a first fin 84, which is beneficial to improve the heat dissipation efficiency from the first end plate 80. The side of the first end plate body 82 facing the battery module 20 is a flat surface, which is convenient for the assembly of the internal structure of the battery pack 100.

[0130] The second end plate body 92 is a part of the second end plate 90 opposite to the housing 10 in the second direction Y. The second end plate body 92 covers the third opening 15 of the housing 10 in the second direction Y. The second end plate body 92 and the second clamping portion 93 can be integrally formed or separately arranged and connected as a whole structure. The second clamping portion 93 can enter the second clamping groove 74 from the second slot of the end surface of the second reinforcing member 70 in the second direction Y. The second clamping portion 93 can be partially clamped in the second clamping groove 74 or fully clamped in the second clamping groove 74. In the second direction Y, the side of the second end plate body 92 away from the battery module 20 has a second fin 94, which is beneficial to improve the heat dissipation efficiency from the second end plate 90. The side of the second end plate body 92 facing the battery module 20 is a flat surface, which is convenient for the assembly of the internal structure of the battery pack 100.

[0131] As shown in Figure 27 , Figure 28 In some embodiments, the first clamping portion 83 includes a first limiting plate 831 and a first protruding portion 832. The first limiting plate 831 is connected to the edge of the first end plate body 82 and is located on the side of the first reinforcing member 60 away from the battery module 20 in the first direction X. The first protruding portion 832 is protruded from the surface of the first limiting plate 831 facing the first reinforcing member 60 and clamped in the first clamping groove 64.

[0132] The first limiting plate 831 is connected to the edge of the first end plate body 82 and is located on the side of the first reinforcing member 60 away from the battery module 20 in the first direction X, which can limit the relative movement of the housing 10 and the first end plate 80 in the first direction X. The first protruding portion 832 is protruded from the surface of the first limiting plate 831 facing the first reinforcing member 60 and clamped in the first clamping groove 64, which can limit the first end plate 80 from being separated from the housing 10, thereby improving the relative stability of the first end plate 80 and the housing 10.

[0133] The first limiting plate 831 is connected to one end of the first end plate body 82 along the second direction Y, and extends to the side of the first reinforcing part 60 away from the battery module 20. For example, the first reinforcing part 61 is provided with the first clamping groove 64 on the side away from the battery module 20, and the first limiting plate 831 of the first clamping part 83 corresponding to the first clamping groove 64 on the first reinforcing part 61 extends to the side of the first reinforcing part 61 away from the battery module 20.

[0134] When the first protruding part 832 is clamped in the first clamping groove 64, the surface of the first limiting plate 831 facing the first reinforcing part 60 can be in contact with the surface of the first reinforcing part 60 away from the battery module 20, or a gap can be formed.

[0135] The second clamping part 93 can be referred to the drawings of the first clamping part 83. The second clamping part 93 includes a second limiting plate (not shown in the drawings) and a second protruding part (not shown in the drawings). The second limiting plate 931 is connected to the edge of the second end plate body 92 and is located on the side of the second reinforcing part 70 away from the battery module 20 along the first direction X. The second protruding part protrudes from the surface of the second limiting plate facing the second reinforcing part 70 and is clamped in the second clamping groove 74. The second limiting plate 931 is connected to the edge of the second end plate body 92 and is located on the side of the second reinforcing part 70 away from the battery module 20 along the first direction X, which can limit the relative movement of the shell 10 and the second end plate 90 in the first direction X. The second protruding part protrudes from the surface of the second limiting plate 931 facing the second reinforcing part 70 and is clamped in the second clamping groove 74, which can limit the second end plate 90 from being separated from the shell 10, thereby improving the relative stability of the second end plate 90 and the shell 10.

[0136] The second limiting plate 931 is connected to one end of the second end plate body 92 along the second direction Y, and extends to the side of the second reinforcing part 70 away from the battery module 20. For example, the fourth reinforcing part 71 is provided with the second clamping groove 74 on the side away from the battery module 20, and the second limiting plate 931 of the second clamping part 93 corresponding to the second clamping groove 74 on the fourth reinforcing part 71 extends to the side of the fourth reinforcing part 71 away from the battery module 20.

[0137] When the second protruding part 932 is clamped in the second clamping groove 74, the surface of the second limiting plate 931 facing the second reinforcing part 70 can be in contact with the surface of the second reinforcing part 70 away from the battery module 20, or a gap can be formed.

[0138] In some embodiments, the first reinforcing part 60 is fixedly connected to the outer surface of the shell 10, and the first reinforcing part 60, the first side plate 12 and the first end plate 80 are sealingly connected. For example, sealing ring, glue, welding and the like.

[0139] In some embodiments, the second reinforcing member is fixedly connected to the outer surface of the shell 10, and the second reinforcing member 70, the second side plate 13 and the second end plate 90 are sealingly connected, such as by a sealing ring, glue, welding, etc.

[0140] The battery pack 100 comprises a shell 10, a battery module 20 and a first heat-conducting member 30; the shell 10 is in a U shape, and comprises a bottom plate 11, a first side plate 12 and a second side plate 13, the first side plate 12 and the second side plate 13 are oppositely arranged along a first direction X, and the bottom plate 11 connects the first side plate 12 and the second side plate 13; the battery module 20 is located between the first side plate 12 and the second side plate 13, and comprises a plurality of battery cells 21, and along the first direction X, there is a first gap A1 between the first side plate 12 and the battery module 20; the first heat-conducting member 30 is arranged in the first gap A1, and the battery module 20 and the first side plate 12 are connected through the first heat-conducting member 30; the first side plate 12 and the second side plate 13 are configured to move away from each other under an external force to place the battery module 20 in the shell 10. Optionally, the external force can be directly applied by manual operation, or can be applied by manual operation with the aid of an external force.

[0141] In the process of assembling the battery pack 100, the first side plate 12 and the second side plate 13 move away from each other under an external force, and then the distance between the first side plate 12 and the second side plate 13 gradually increases in a direction away from the bottom plate 11, so that the shell 10 forms a larger entrance at one end away from the bottom plate 11, providing more space for the battery module 20 to enter the shell 10, facilitating the entry of the battery module 20 into the shell 10. After the external force is removed, the first side plate 12 and the second side plate 13 reset in a direction of moving closer to each other along the first direction X, and then along the first direction X, the gap between the first side plate 12 and the battery module 20 and the gap between the second side plate 13 and the battery module 20 are both small, which can shorten the heat-conducting path between the battery module 20 and the first side plate 12 of the shell 10 and between the battery module 20 and the second side plate 13, thereby improving the heat dissipation capacity of the battery pack 100. The first heat-conducting member 30 arranged between the first side plate 12 and the battery module 20 is conducive to improving the heat exchange efficiency between the battery module 20 and the first side plate 12, thereby further improving the heat dissipation efficiency of the battery pack 100.

[0142] The bottom plate 11 is connected with the first side plate 12 and the second side plate 13 at two ends along the first direction X respectively, and the bottom plate 11, the first side plate 12 and the second side plate 13 jointly form the U-shaped shell 10. The shell 10 forms the second opening 14 and the third opening 15 at opposite ends along the second direction Y respectively, and the shell 10 forms the fourth opening 16 at an end away from the bottom plate 11, and the fourth opening 16 and the bottom plate 11 are oppositely arranged along the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other. The battery module 20 can enter the shell 10 from the fourth opening 16. When an external force P is applied to the first side plate 12 and the second side plate 13, the fourth opening 16 is increased along the first direction X, so that the battery module 20 enters the shell 10 from the fourth opening 16.

[0143] The material of the shell 10 can be various, such as steel, copper, aluminum and the like, which is not limited in the application.

[0144] As shown in Figure 3 , the battery module 20 includes a plurality of battery cells 21 stacked, and the plurality refers to two or more. The plurality of battery cells 21 can be stacked in any direction, such as the stacking direction of the plurality of battery cells 21 being perpendicular to the direction in which the first side plate 12 and the second side plate 13 of the shell 10 are oppositely arranged, such as the plurality of battery cells 21 being stacked along the second direction Y or the plurality of battery cells 21 being stacked along the third direction Z. As shown in Figure 3 , in this embodiment, the plurality of battery cells 21 are stacked along the third direction Z, so that the battery module 20 enters the shell 10. In other embodiments, the plurality of battery cells 21 can also be stacked along the first direction X.

[0145] A first buffer 22 can also be provided between two adjacent battery cells 21, and the first buffer 22 can be foam, rubber pad or the like. Among them, the first buffer 22 can be provided between every two adjacent battery cells 21 to provide a buffer space for the expansion of the battery cell 21, and also help to improve the ability of the battery pack 100 to resist external impact. The first buffer 22 can also be provided between part of the two adjacent battery cells 21, which can reduce the number of first buffers 22 and help to improve the energy density and manufacturing cost of the battery pack 100. Along the stacking direction of the plurality of battery cells 21, the first buffer 22 can also be provided on the side of the battery cell 21 located at the end away from the adjacent battery cell 21, which can protect the battery cell 21 located at the end.

[0146] The battery cell 21 can be a soft package battery cell or a steel shell battery cell. The plurality of battery cells 21 are electrically connected. The plurality of battery cells 21 can be connected in series, in parallel or in a mixed manner, wherein the mixed manner means that the plurality of battery cells 21 are connected in parallel and in series.

[0147] As shown in Figure 4As shown, the battery cell 21 includes a packaging bag 23, an electrode assembly (not shown in the figure), and a tab 25 connected to the electrode assembly. The electrode assembly includes a separator film (not shown in the figure), a positive electrode sheet (not shown in the figure) and a negative electrode sheet (not shown in the figure) with opposite polarities. The positive electrode sheet includes a positive electrode active material layer (not shown in the figure) and a positive electrode current collector (not shown in the figure). The negative electrode sheet includes a negative electrode active material layer (not shown in the figure) and a negative electrode current collector (not shown in the figure). Taking a lithium ion battery as an example, the material of the positive electrode current collector can be aluminum, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The material of the negative electrode current collector can be copper, and the negative electrode active material can be carbon or silicon, etc. The material of the separator film can be PP (polypropylene) or PE (polyethylene), etc. The tab 25 includes a positive electrode tab 24a and a negative electrode tab 24b, the positive electrode tab 24a is in conductive connection with the current collector of the positive electrode sheet, and the negative electrode tab 24b is in conductive connection with the current collector of the negative electrode sheet.

[0148] As shown in Figure 4 The packaging bag 23 includes a sealing portion 231 and a packaging body 232, and the sealing portion 231 is connected to three edges adjacent to the packaging body 232. The sealing portion 231 includes a first sealing portion 2311, a second sealing portion 2312, and a third sealing portion 2313 connected in sequence, the first sealing portion 2311 and the third sealing portion 2313 are oppositely arranged, and the second sealing portion 2312 is connected between the first sealing portion 2311 and the third sealing portion 2313.

[0149] At least part of the active material portion of the positive electrode sheet, the active material portion of the negative electrode sheet, and the separator film form a main body portion of the electrode assembly, the main body portion is accommodated in the packaging body 232, the positive electrode tab 24a and the negative electrode tab 24b extend from the same end of the main body portion to the sealing portion 231 and extend out of the packaging bag 23 from the sealing portion 231, such as the positive electrode tab 24a and the negative electrode tab 24b extending out of the packaging bag 23 from the second sealing portion 2312. In this embodiment, the first sealing portion 2311 and the third sealing portion 2313 are oppositely arranged along the first direction X, the first sealing portion 2311 is arranged close to the first side plate 12, and the third sealing portion 2313 is arranged close to the second side plate 13.

[0150] A first space 2310 is formed between the sealing portions 231 of two adjacent battery cells 21, and optionally, the first space 2310 can be provided with foam.

[0151] In some embodiments, the battery module 20 further includes a first circuit board 26 (not shown in the figure) Figure 2As shown in FIG. 1, the positive and negative tabs 24a and 24b of the battery cell 21 extend out of the packaging bag 23 and are electrically connected to the first circuit board 26. The plurality of battery cells 21 are connected in series, in parallel, or in a mixed connection. The first circuit board 26 has a total positive electrode 261 and a total negative electrode 262 of the electrode assembly, and the battery module 20 can be charged and discharged through the total positive electrode 261 and the total negative electrode 262.

[0152] In an embodiment, the first circuit board 26 is a printed circuit board (PCB). Optionally, the first circuit board 26 is a flexible printed circuit (FPC).

[0153] As shown in FIG. 1, the positive and negative tabs 24a and 24b of the battery cell 21 extend out of the packaging bag 23 and are electrically connected to the first circuit board 26. The plurality of battery cells 21 are connected in series, in parallel, or in a mixed connection. The first circuit board 26 has a total positive electrode 261 and a total negative electrode 262 of the electrode assembly, and the battery module 20 can be charged and discharged through the total positive electrode 261 and the total negative electrode 262. Figure 5 Figure 6 As shown in FIG. 1, the positive and negative tabs 24a and 24b of the battery cell 21 extend out of the packaging bag 23 and are electrically connected to the first circuit board 26. The plurality of battery cells 21 are connected in series, in parallel, or in a mixed connection. The first circuit board 26 has a total positive electrode 261 and a total negative electrode 262 of the electrode assembly, and the battery module 20 can be charged and discharged through the total positive electrode 261 and the total negative electrode 262.

[0154] The third heat-conducting member 27 is arranged to facilitate the rapid dissipation of heat from the battery cell 21, thereby improving the heat dissipation capacity of the battery pack 100.

[0155] In combination with the above, Figure 5 Figure 6 Figure 7 The third heat-conducting member 27 includes a bottom wall 271 and a side wall 272, one end of the side wall 272 being connected to an edge of the bottom wall 271, the bottom wall 271 and the side wall 272 together forming a receiving cavity for receiving the packaging body 232 of the battery cell 21, and the side wall 272 is formed with a notch 273 for the sealing portion 231 and the tabs 25 to extend out of the receiving cavity.

[0156] The third heat-conducting member 27 can be made of metal such as aluminum or copper. Of course, the third heat-conducting member 27 can also be made of non-metal materials such as rubber.

[0157] ​​​The side wall 272 includes a first side wall 2721, a second side wall 2722 and a third side wall 2723, which are connected to three edges of the bottom wall 271 in sequence. The bottom wall 271 is located between two adjacent battery cells 21. The first side wall 2721 and the second side wall 2722 are arranged opposite to each other along the first direction X. Along the first direction X, the first side wall 2721 is located between the battery cell 21 and the first side plate 12, and the second side wall 2722 is located between the battery cell 21 and the second side plate 13. The third side wall 2723 is connected to an edge of the bottom wall 271 in the second direction Y, and is located between the second end plate 90 and the battery cell 21. The side wall 272 is formed with a fifth opening 274 at an end away from the bottom wall 271.

[0158] The third heat-conducting member 27 can be arranged between every two adjacent battery cells 21, so that the heat of each battery cell 21 can be quickly conducted out. Alternatively, the third heat-conducting member 27 can be arranged between part of the adjacent battery cells 21, so that the number of third heat-conducting members 27 can be reduced, thereby saving cost and improving the energy density of the battery pack 100.

[0159] The battery module 20 can include a plurality of third heat-conducting members 27 arranged in a stacking direction of the plurality of battery cells 21. Figure 5 As shown, the fifth openings 274 of two adjacent third heat-conducting members 27 are arranged opposite to each other, and together define a sub-space for accommodating a battery cell 21. One or more battery cells 21 can be arranged in each sub-space. The two adjacent third heat-conducting members 27 and the battery cell 21 located therebetween can together form a battery cell 21 unit. A second buffer member 28, which can be a foam, a rubber pad or the like, can be arranged between two adjacent battery cell 21 units. The second buffer member 28 can provide space for the expansion of the battery cell 21 unit and improve the ability of the battery pack 100 to resist external impact.

[0160] In other embodiments, the battery module 20 can also not include the third heat-conducting member 27 (as shown in Figure 3 ).

[0161] As shown in Figures 8-11 , in the embodiment in which the battery module 20 does not include the third heat-conducting member 27, the first gap A1 between the first side plate 12 and the battery module 20 is the distance between the inner surface 121 of the first side plate and the first sealing portion 2311 of the battery cell 21. The first heat-conducting member 30 is arranged in the first gap A1.

[0162] In embodiments where the battery module 20 does not have a third heat-conducting component 27, the length of the first gap A1 along the first direction X is H1, and H1 is 0.05mm to 2.5mm. For example, H1 can be 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, etc.

[0163] Along the first direction X, the length of the first gap A1 is 0.05mm~2.5mm, so the heat conduction path between the battery module 20 and the first side plate 12 is shorter, which makes the heat conduction path from the battery module 20 to the first side plate 12 smaller, thereby improving the heat dissipation capacity of the battery pack 100.

[0164] Furthermore, H1 can be located between 0.1mm and 1.9mm. For example, H1 can be 0.1mm, 0.3mm, 0.6mm, 0.9mm, 1.3mm, 1.6mm, 1.9mm, etc. With the length of the first gap A1 along the first direction X being between 0.1mm and 1.9mm, the heat conduction path between the battery module 20 and the first side plate 12 is further shortened, resulting in a smaller heat conduction path from the battery module 20 to the first side plate 12, thereby further improving the heat dissipation capacity of the battery pack 100.

[0165] Furthermore, H1 can be located between 0.1mm and 1.4mm. For example, H1 can be 0.2mm, 0.7mm, 0.8mm, 1.2mm, 1.4mm, etc. With the length of the first gap A1 along the first direction X being between 0.1mm and 1.4mm, the heat conduction path between the battery module 20 and the first side plate 12 is further shortened, making the heat conduction path from the battery module 20 to the first side plate 12 smaller, thus improving the heat dissipation capacity of the battery pack 100.

[0166] like Figures 12-15 As shown, in an embodiment where the battery module 20 is provided with a third heat-conducting component 27, the first gap A1 is the distance between the inner surface 121 of the first side plate and the first side wall 2721.

[0167] In an embodiment where the battery module 20 is provided with a third heat-conducting component 27, the length of the first gap A1 along the first direction X is H2, and H2 is 0.05mm to 2.5mm. For example, H2 is 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, etc.

[0168] Further, H2 is 0.05mm-1.5mm, the heat conduction path between the battery module 20 provided with the third heat conduction member 27 and the first side plate 12 is shorter, so that the heat conduction path of the battery module 20 to the first side plate 12 is smaller, thereby improving the heat dissipation capacity of the battery pack 100. Exemplarily, H2 is 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, etc.

[0169] Further, H2 is 0.1mm-1.1mm, the heat conduction path between the battery module 20 provided with the third heat conduction member 27 and the first side plate 12 is further shortened, so that the heat conduction path of the battery module 20 to the first side plate 12 is smaller, thereby further improving the heat dissipation capacity of the battery pack 100. Exemplarily, H2 is 0.1mm, 0.15mm, 0.25mm, 0.35mm, 0.45mm, 0.55mm, 0.65mm, 0.75mm, 0.85mm, 0.95mm, 1.1mm, etc.

[0170] Further, H2 is 0.1mm-0.6mm, the heat conduction path between the battery module 20 and the first side plate 12 is further shortened, so that the heat conduction path of the battery module 20 to the first side plate 12 is smaller, so that the heat dissipation capacity of the battery pack 100 is more optimal. Exemplarily, H2 is 0.1mm, 0.13mm, 0.16mm, 0.19mm, 0.22mm, 0.28mm, 0.32mm, 0.38mm, 0.42mm, 0.48mm, 0.52mm, 0.58mm, 0.6mm, etc.

[0171] The first heat conduction member 30 is arranged between the first side plate 12 and the battery module 20, along the first direction X, the first heat conduction member 30 can be in contact with the first side plate 12, the first heat conduction member 30 can be in contact with the battery module 20, the battery module 20 and the first side plate 12 are in thermal conduction through the first heat conduction member 30, which is conducive to improving the heat dissipation efficiency of the battery pack 100. The first heat conduction member 30 is arranged between the first side plate 12 and the battery module 20, occupying the space between the first side plate 12 and the battery module 20, so that the internal structure of the shell 10 is more compact, which can reduce the risk of displacement of the battery module 20 and other structures inside the shell 10, thereby improving the safety performance of the battery pack 100.

[0172] The first heat-conducting member 30 can be a colloid with good heat-conducting performance, a metal member with good heat-conducting performance, or the like. In an embodiment in which the first heat-conducting member 30 is a heat-conducting colloid, the first heat-conducting member 30 can cause the colloid coated on the surface of the first side plate 12 facing the battery module 20 and / or the side of the battery module 20 facing the first side plate 12 to solidify after curing, which is conducive to improving the stability of the internal structure of the shell 10. The first heat-conducting member 30 can also be a solid heat-conducting adhesive strip, a metal member, or the like.

[0173] As shown in FIG. 1, Figure 2 In some embodiments, a second gap A2 is formed between the second side plate 13 and the battery module 20; and the battery pack 100 further includes a second heat-conducting member 50 disposed in the second gap A2.

[0174] The second heat-conducting member 50 disposed between the second side plate 13 and the battery module 20 is conducive to improving the heat exchange efficiency between the battery module 20 and the second side plate 13, thereby further improving the heat dissipation efficiency of the battery pack 100.

[0175] As shown in FIG. 1, Figure 16 , Figure 17 In an embodiment in which the battery module 20 is not provided with the third heat-conducting member 27, the second gap A2 formed between the second side plate 13 and the battery module 20 is the distance between the inner surface 131 of the second side plate and the third sealing portion 2313 of the battery cell 21. The second heat-conducting member 50 is disposed in the second gap A2.

[0176] In an embodiment in which the battery module 20 is not provided with the third heat-conducting member 27, the length of the second gap A2 along the first direction X is L1, and L1 is 0.05 mm to 2.5 mm. Exemplarily, L1 can be 0.05 mm, 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, or the like.

[0177] When the length of the second gap A2 along the first direction X is 0.05 mm to 2.5 mm, the heat-conducting path between the battery module 20 and the second side plate 13 is relatively short, so that the heat-conducting path from the battery module 20 to the second side plate 13 is relatively small, thereby improving the heat dissipation capacity of the battery pack 100.

[0178] Further, L1 can be 0.1 mm to 1.9 mm. Exemplarily, L1 can be 0.1 mm, 0.3 mm, 0.6 mm, 0.9 mm, 1.3 mm, 1.6 mm, 1.9 mm, or the like. When the length of the second gap A2 along the first direction X is 0.1 mm to 1.9 mm, the heat-conducting path between the battery module 20 and the second side plate 13 is further shortened, so that the heat-conducting path from the battery module 20 to the second side plate 13 is further smaller, thereby further improving the heat dissipation capacity of the battery pack 100.

[0179] Further, L1 can be 0.1mm~1.4mm. Illustratively, L1 can be 0.2mm, 0.7mm, 0.8mm, 1.2mm, 1.4mm, etc. Along the first direction X, the length of the second gap A2 is 0.1mm~1.4mm, which further shortens the heat conduction path between the battery module 20 and the second side plate 13, so that the heat conduction path from the battery module 20 to the second side plate 13 is smaller, so that the heat dissipation capability of the battery pack 100 is more optimal.

[0180] As shown in FIG. 1, in the embodiment in which the battery module 20 is provided with the third heat conduction member 27, the second gap A2 formed between the second side plate 13 and the battery module 20 is the distance between the inner surface 131 of the second side plate and the second side wall 2722 of the third heat conduction member 27. Figure 18 、 Figure 19 As shown in FIG. 1, in the embodiment in which the battery module 20 is provided with the third heat conduction member 27, the second gap A2 formed between the second side plate 13 and the battery module 20 is the distance between the inner surface 131 of the second side plate and the second side wall 2722 of the third heat conduction member 27.

[0181] In the embodiment in which the battery module 20 is provided with the third heat conduction member 27, along the first direction X, the length of the second gap A2 is L2, and L2 is 0.05mm~2.5mm. Illustratively, L2 is 0.05mm, 0.1mm, 0.15mm, 0.2mm, 0.25mm, etc.

[0182] Further, L2 is 0.05mm~1.5mm, which shortens the heat conduction path between the battery module 20 provided with the third heat conduction member 27 and the second side plate 13, so that the heat conduction path from the battery module 20 to the second side plate 13 is smaller, thereby improving the heat dissipation capability of the battery pack 100. Illustratively, L2 is 0.05mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.5mm, etc.

[0183] Further, L2 is 0.1mm~1.1mm, which further shortens the heat conduction path between the battery module 20 provided with the third heat conduction member 27 and the second side plate 13, so that the heat conduction path from the battery module 20 to the second side plate 13 is smaller, thereby further improving the heat dissipation capability of the battery pack 100. Illustratively, H2 is 0.1mm, 0.15mm, 0.25mm, 0.35mm, 0.45mm, 0.55mm, 0.65mm, 0.75mm, 0.85mm, 0.95mm, 1.1mm, etc.

[0184] Further, L2 is 0.1 mm to 0.6 mm, which further shortens the heat conduction path between the battery module 20 and the second side plate 13, so that the heat conduction path from the battery module 20 to the second side plate 13 is smaller, so that the heat dissipation capability of the battery pack 100 is more optimal. Exemplarily, H2 is 0.1 mm, 0.13 mm, 0.16 mm, 0.19 mm, 0.22 mm, 0.28 mm, 0.32 mm, 0.38 mm, 0.42 mm, 0.48 mm, 0.52 mm, 0.58 mm, 0.6 mm, etc.

[0185] The second heat conduction member 50 is arranged between the second side plate 13 and the battery module 20, and along the first direction X, the second heat conduction member 50 can be in contact with the second side plate 13, and the second heat conduction member 50 can be in contact with the battery module 20, and the battery module 20 and the second side plate 13 conduct heat through the second heat conduction member 50, which is conducive to improving the heat dissipation efficiency of the battery pack 100. The second heat conduction member 50 is arranged between the second side plate 13 and the battery module 20, and makes use of the space between the second side plate 13 and the battery module 20, so that the internal structure of the shell 10 is more compact, which can reduce the risk of movement of the battery module 20 and other structures inside the shell 10, thereby improving the safety performance of the battery pack 100. The first heat conduction member 30 and the second heat conduction member 50 can jointly limit the movement of the battery module 20 in the shell 10.

[0186] The second heat conduction member 50 can be a colloid with good heat conduction performance, a metal member with good heat conduction performance, etc. In the embodiment in which the second heat conduction member 50 is a heat-conducting glue, the second heat conduction member 50 can be solidified after being coated on the surface of the second side plate 13 facing the battery module 20 and / or the side of the battery module 20 facing the second side plate 13, which is conducive to improving the stability of the internal structure of the shell 10. The second heat conduction member 50 can also be a solid heat-conducting glue strip, a metal member, etc.

[0187] In some embodiments, the bottom plate 11, the first side plate 12 and the second side plate 13 are integrally formed.

[0188] The integrally formed bottom plate 11, first side plate 12 and second side plate 13 means that the bottom plate 11, first side plate 12 and second side plate 13 are formed by an integrally formed method, which can be stamping, casting, injection molding, bending, etc. The integrally formed bottom plate 11 and two side plates make the shell 10 easier to process and form.

[0189] In some embodiments, the bottom plate 11, the first side plate 12 and the second side plate 13 are integrally formed. In other embodiments, the bottom plate 11, the first side plate 12 and the second side plate 13 are separately provided and then connected to form the U-shaped housing 10. For example, the bottom plate 11, the first side plate 12 and the second side plate 13 are welded, bonded or bolted together. This facilitates the selection of the appropriate thickness of the first side plate 12, the second side plate 13 and the bottom plate 11 according to the actual working conditions. In the case of detachable connection of the bottom plate 11, the first side plate 12 and the second side plate 13, it is also convenient for the maintenance and replacement of the bottom plate 11, the first side plate 12 and the second side plate 13.

[0190] In some embodiments, the thickness of the first side plate 12 along the first direction X is 0.5-4 mm, which is advantageous for strengthening the protection of the battery module 20. Alternatively, the thickness of the first side plate 12 along the first direction X is 1-3 mm, which is advantageous for the assembly of the battery module 20. Alternatively, the thickness of the first side plate 12 along the first direction X is 0.5-1.8 mm, which is further advantageous for the assembly of the battery module 20 and reduces the weight of the battery pack 100.

[0191] In some embodiments, the thickness of the second side plate 13 along the first direction X is 0.5-4 mm, which is advantageous for strengthening the protection of the battery module 20. Alternatively, the thickness of the second side plate 13 along the first direction X is 1-3 mm, which is advantageous for the assembly of the battery module 20. Alternatively, the thickness of the second side plate 13 along the first direction X is 0.5-1.8 mm, which is further advantageous for the assembly of the battery module 20 and reduces the weight of the battery pack 100.

[0192] In combination with reference to Figure 1 , Figure 2 , Figure 22 In some embodiments, the battery pack 100 further comprises a first end plate 80 and a second end plate 90, which are arranged along the second direction Y. The first side plate 12 and the second side plate 13 are fixedly connected to the first end plate 80, and the first side plate 12 and the second side plate 13 are fixedly connected to the second end plate 90. The first end plate 80, the second end plate 90 and the housing 10 form a box Q with a first opening Q1 opposite the bottom plate 11. The battery module 20 is accommodated in the box Q.

[0193] The first end plate 80, the second end plate 90 and the shell 10 jointly form a box Q with the first opening Q1, and the box Q can better protect the battery module 20, thereby improving the safety performance of the battery pack 100 and reducing the risk of damage to the structure in the box Q. The first side plate 12 and the second side plate 13 are fixedly connected with the first end plate 80, and the first side plate 12 and the second side plate 13 are fixedly connected with the second end plate 90, thereby improving the structural strength of the box Q. The first end plate 80 and the second end plate 90 also have a binding effect on the first side plate 12 and the second side plate 13, thereby alleviating the problem of deformation of the first side wall 2721 and the second side wall 2722 away from each other.

[0194] The material of the first end plate 80 and the material of the shell 10 can be the same or different. The material of the second end plate 90 and the material of the shell 10 can be the same or different.

[0195] The first side plate 12 and the second side plate 13 are fixedly connected with the first end plate 80, that is, the first side plate 12 and the first end plate 80 have a stable connection relationship, and the second side plate 13 and the first end plate 80 have a stable connection relationship.

[0196] The first end plate 80 is provided with a plurality of first fixing holes, the first side plate 12 and / or the first reinforcing member 60 is provided with a second fixing hole, and the second side plate and / or the first reinforcing member is provided with a third fixing hole. The second fixing hole and the third fixing hole are respectively connected with a plurality of first fixing holes through a first connecting member. In the third direction, the second fixing hole and the third fixing hole are closer to the first opening Q1 than the first clamping groove.

[0197] The first side plate 12 and the second side plate 13 can be detachably connected with the first end plate 80, such as bolt connection, screw connection, clamping connection, etc., which is convenient for maintenance and replacement of the first side plate 12 and the first end plate 80. Taking the bolt connection as an example, the first fixing hole can be a first threaded hole 81, the second fixing hole can be a second threaded hole 123, the third fixing hole can be a third threaded hole 133, and the first connecting member can be a bolt. Figure 22 As shown in FIG. 1, the first end plate 80 is provided with a plurality of first threaded holes 81, the shell 10 is provided with a second threaded hole 123, and part of the first threaded hole 81 and the second threaded hole 123 are coaxially arranged along the first direction X and are threadedly connected with the first threaded hole 81 and the second threaded hole 123 through a bolt, thereby realizing the fixed connection of the first end plate 80 and the first side plate 12. The shell 10 is also provided with a third threaded hole 133, and part of the first threaded hole 81 and the third threaded hole 133 are coaxially arranged along the first direction X and are threadedly connected with the first threaded hole 81 and the third threaded hole 133 through a bolt, thereby realizing the fixed connection of the first end plate 80 and the second side plate 13.

[0198] The second threaded hole 123 can be directly arranged on the first side plate 12 or indirectly arranged on the first side plate 12. In the embodiment in which the first reinforcing member 60 is arranged at the end of the shell 10 corresponding to the first end plate 80, the second threaded hole 123 can be arranged on the first reinforcing portion 61 of the first reinforcing member 60, so that the second threaded hole 123 is indirectly arranged on the first side plate 12. After the first threaded hole 81 and the second threaded hole 123 are connected by bolts, the first reinforcing member 60 and the first end plate 80 are also fixedly connected.

[0199] The third threaded hole 133 can be directly arranged on the second side plate 13 or indirectly arranged on the second side plate 13. In the embodiment in which the first reinforcing member 60 is arranged at the end of the shell 10 corresponding to the first end plate 80, the third threaded hole 133 can be arranged on the second reinforcing portion 62 of the first reinforcing member 60, so that the third threaded hole 133 is indirectly arranged on the second side plate 13. After the first threaded hole 81 and the third threaded hole 133 are connected by bolts, the first reinforcing member 60 and the first end plate 80 are also fixedly connected.

[0200] The first side plate 12 and the second side plate 13 are fixedly connected with the second end plate 90, which means that the first side plate 12 and the second end plate 90 have a stable connection relationship, and the second side plate 13 and the second end plate 90 have a stable connection relationship. The second end plate 90 is provided with a plurality of fourth fixing holes, the first side plate 12 and / or the second reinforcing member 70 is provided with a fifth fixing hole, and the second side plate 13 and / or the second reinforcing member 70 is provided with a sixth fixing hole. The fifth fixing hole and the sixth fixing hole are respectively connected with the plurality of fourth fixing holes by a second connecting member. The fifth fixing hole and the sixth fixing hole are closer to the first opening than the second clamping groove.

[0201] The first side plate 12 and the second side plate 13 can be detachably connected with the second end plate 90, such as bolt connection, screw connection, clamping connection, etc., which is convenient for the maintenance and replacement of the first side plate 12 and the second end plate 90, and the maintenance and replacement of the second side plate 13 and the second end plate 90. Taking the bolt connection as an example, the fourth fixing hole can be a fourth threaded hole 91, the fifth fixing hole can be a fifth threaded hole 124, the sixth fixing hole can be a sixth threaded hole 134, and the second connecting member can be a bolt, such as Figure 22As shown, the second end plate 90 is provided with a plurality of fourth threaded holes 91, the shell 10 is provided with a fifth threaded hole 124, part of the fourth threaded holes 91 and the fifth threaded hole 124 are coaxially arranged along the first direction X, and are threadedly connected by bolts to the fourth threaded holes 91 and the fifth threaded hole 124, so as to realize the fixed connection of the second end plate 90 and the first side plate 12. The shell 10 is provided with a sixth threaded hole 134, part of the fourth threaded holes 91 and the sixth threaded hole 134 are coaxially arranged along the first direction X, and are threadedly connected by bolts to the fourth threaded holes 91 and the sixth threaded hole 134, so as to realize the fixed connection of the second end plate 90 and the second side plate 13.

[0202] The fifth threaded hole 124 can be directly provided on the first side plate 12, or indirectly provided on the first side plate 12. In the embodiment in which the shell 10 is provided with the second reinforcing member 70 at the end corresponding to the second end plate 90, the fifth threaded hole 124 can be provided on the fourth reinforcing portion 71 of the second reinforcing member 70, so as to realize the indirect provision of the fifth threaded hole 124 on the first side plate 12. After the fifth threaded hole 124 and the fourth threaded hole 91 are connected by bolts, the second reinforcing member 70 and the second end plate 90 are also fixedly connected.

[0203] The sixth threaded hole 134 can be directly provided on the second side plate 13, or indirectly provided on the second side plate 13. In the embodiment in which the shell 10 is provided with the second reinforcing member 70 at the end corresponding to the second end plate 90, the sixth threaded hole 134 can be provided on the fifth reinforcing portion 72 of the second reinforcing member 70, so as to realize the indirect provision of the sixth threaded hole 134 on the second side plate 13. After the sixth threaded hole 134 and the fourth threaded hole 91 are connected by bolts, the second reinforcing member 70 and the second end plate 90 are also fixedly connected.

[0204] The fourth opening 16 of the shell 10 is part of the first opening Q1 of the box Q.

[0205] In the embodiment in which the shell 10 is provided with the first reinforcing member 60 and the second reinforcing member 70 at the end along the second direction Y, the first sealing member can be partially located between the end of the shell 10 and the first end plate 80, and partially located between the end face of the first reinforcing member 60 along the second direction Y and the first end plate 80, and the second sealing member can be partially located between the end of the shell 10 and the second end plate 90, and partially located between the end face of the second reinforcing member 70 along the second direction Y and the second end plate 90, so as to increase the area and improve the sealing effect.

[0206] For reference Figure 1 , Figure 2 , Figure 30In some embodiments, the battery pack 100 further comprises a cover 110 covering the first opening Q1 of the box Q; the battery pack 100 further comprises a second circuit board 120 located on the side of the battery module 20 away from the bottom plate 11.

[0207] The cover 110 covers the first opening Q1 of the box Q, which can better protect the structure inside the box Q and reduce the risk of damage to the structure inside the box Q, thereby prolonging the service life of the structure inside the box Q. The second circuit board 120 is located on the side of the battery module 20 away from the bottom plate 11, i.e., the second circuit board 120 is arranged at a position close to the first opening Q1 of the box Q, facilitating installation of the second circuit board 120.

[0208] As shown in Figure 30 , the cover 110 has a cavity formed therein, and the cavity of the cover 110 and the accommodating space of the box Q together accommodate the internal structure of the battery pack 100.

[0209] The shell 10, the first end plate 80 and the second end plate 90 are all connected with the cover 110. The first end plate 80 is provided with a seventh fixing hole, the second end plate 90 is provided with an eighth fixing hole, and the cover 110 is provided with a plurality of ninth fixing holes, a part of the plurality of ninth fixing holes being connected with the seventh fixing hole through a third connecting piece, and another part of the plurality of ninth fixing holes being connected with the eighth fixing hole through a fourth connecting piece.

[0210] The shell 10, the first end plate 80 and the second end plate 90 can all be connected with the cover 110 by welding, bolting, clamping or the like. Taking bolting as an example, the seventh fixing hole can be a seventh threaded hole 86, the eighth fixing hole can be an eighth threaded hole 96, the ninth fixing hole can be a ninth threaded hole 1101, and the third connecting piece and the fourth connecting piece can both be bolts. For details, see Figure 1 、 Figure 2 、 Figure 23 、 Figure 30 A seventh threaded hole 86 is arranged on the first end plate 80, an eighth threaded hole 96 is arranged on the second end plate 90, and the cover 110 is provided with a plurality of ninth threaded holes 1101 corresponding to the seventh threaded hole 86 and the eighth threaded hole 96, a part of the ninth threaded holes 1101 being coaxially arranged with the seventh threaded hole 86 along a third direction Z, and another part of the ninth threaded holes 1101 being coaxially arranged with the eighth threaded hole 96 along the third direction Z. The cover 110 and the first end plate 80 are connected by bolting the seventh threaded hole 86 and the ninth threaded hole 1101, and the cover 110 and the second end plate 90 are connected by bolting the eighth threaded hole 96 and the ninth threaded hole 1101, so as to realize connection of the shell 10, the two end plates and the cover 110 into an integral structure, thereby enabling the cover 110 to cover the first opening Q1 of the box Q.

[0211] The second circuit board 120 is located on the side of the battery module 20 away from the base plate 11. Specifically, the second circuit board 120 is disposed along the third direction Z on the side of the battery module 20 away from the base plate 11 and close to the first opening Q1 of the housing Q, which facilitates the installation of the second circuit board 120.

[0212] The second circuit board 120 may be equipped with detection devices for detecting internal parameters of the battery pack 100, such as temperature sensors, voltage sensors, pressure sensors, etc.

[0213] In one embodiment, the second circuit board 120 includes a printed circuit board (PCB) with multiple conductive lines (not shown). Optionally, the second circuit board 120 includes a flexible printed circuit board (FPC).

[0214] In one embodiment, the second circuit board 120 includes a BMS (Battery Management System) component, which includes multiple electronic components capable of performing functions such as data acquisition, control, protection, communication, power calculation, signal transmission, and power transmission for the battery cell 21 and battery module 20.

[0215] In one embodiment, along the second direction Y, the first circuit board 26 is disposed between the first end plate 80 and the battery module 20, and the second circuit board 120 is located on the side of the battery module 20 away from the bottom plate 11 along the third direction Z. The first circuit board 26 and the second circuit board 120 are located in different positions of the battery module 20 and do not interfere with each other. This not only facilitates the installation of the first circuit board 26 and the second circuit board 120, but also reduces the risk of short circuit in the battery pack 100.

[0216] like Figure 31 As shown, in some embodiments, the inner surface 121 of the first side plate is provided with a plurality of first protrusions 125, which are spaced apart along a third direction Z. Each first protrusion 125 extends along a second direction Y. Along a first direction X, the first protrusion 125 extends between the sides of two adjacent cells 21.

[0217] In some embodiments, the first protrusion 125 may extend along the second direction Y to both ends of the first side plate 12. In other embodiments, the two ends of the first protrusion 125 along the second direction Y may be at a distance from the two ends of the first side plate 12 along the second direction Y.

[0218] The extension length of the first protruding part 125 along the second direction Y can be the same as the length of the battery cell 21 along the second direction Y, or the extension length of the first protruding part 125 along the third direction Z is greater than the length of the battery cell 21 along the second direction Y, so as to increase the connection area with the battery cell 21 and improve heat dissipation. Alternatively, the extension length of the first protruding part 125 along the second direction Y is less than the length of the battery cell 21 along the third direction Z, so that more space can be reserved for the first heat-conducting member 30, and the heat dissipation capacity can be improved through the first heat-conducting member 30.

[0219] As shown in FIG. 1, the surface of the first protruding part 125 facing the battery cell 21 is a first arc surface 1251. In the embodiment in which the battery cell 21 is a soft-pack battery cell and the battery module 20 is not provided with the third heat-conducting member 27, the two sides of the battery cell 21 along the first direction X are both arc sides. The surface of the first protruding part 125 facing the battery cell 21 is a first arc surface 1251 that matches part of the arc side of the battery cell 21, so that after the first protruding part 125 extends between the two adjacent battery cells 21, the first protruding part 125 has the largest possible contact area with the battery cell 21, and the battery cell 21 and the first side plate 12 can directly conduct heat, which is conducive to improving the heat dissipation capacity. Figure 31 As shown in FIG. 1, the surface of the first protruding part 125 facing the battery cell 21 is a first arc surface 1251. In the embodiment in which the battery cell 21 is a soft-pack battery cell and the battery module 20 is not provided with the third heat-conducting member 27, the two sides of the battery cell 21 along the first direction X are both arc sides. The surface of the first protruding part 125 facing the battery cell 21 is a first arc surface 1251 that matches part of the arc side of the battery cell 21, so that after the first protruding part 125 extends between the two adjacent battery cells 21, the first protruding part 125 has the largest possible contact area with the battery cell 21, and the battery cell 21 and the first side plate 12 can directly conduct heat, which is conducive to improving the heat dissipation capacity.

[0220] Figure 32 As shown in FIG. 1, the surface of the first protruding part 125 facing the battery cell 21 is a first arc surface 1251. In the embodiment in which the battery cell 21 is a soft-pack battery cell and the battery module 20 is not provided with the third heat-conducting member 27, the two sides of the battery cell 21 along the first direction X are both arc sides. The surface of the first protruding part 125 facing the battery cell 21 is a first arc surface 1251 that matches part of the arc side of the battery cell 21, so that after the first protruding part 125 extends between the two adjacent battery cells 21, the first protruding part 125 has the largest possible contact area with the battery cell 21, and the battery cell 21 and the first side plate 12 can directly conduct heat, which is conducive to improving the heat dissipation capacity.

[0221] In some embodiments, the second protruding part 135 along the second direction Y can extend to both ends of the second side plate 13. In other embodiments, the two ends of the second protruding part 135 along the second direction Y can be respectively away from the two ends of the second side plate 13 along the second direction Y, so as to facilitate the connection of the first end plate 80 and the second end plate 90 with the two ends of the shell 10.

[0222] The extension length of the second protruding part 135 along the second direction Y can be the same as the length of the battery cell 21 along the second direction Y, or the extension length of the second protruding part 135 along the second direction Y is greater than the length of the battery cell 21 along the second direction Y, so as to increase the contact area with the battery cell 21 and improve the heat dissipation capacity. Alternatively, the extension length of the second protruding part 135 along the second direction Y is less than the length of the battery cell 21 along the second direction Y, so that more space can be reserved for the second heat-conducting member 50, and the heat dissipation capacity can be improved through the second heat-conducting member 50.

[0223] As shown in FIG. 1, the surface of the first protruding part 125 facing the battery cell 21 is a first arc surface 1251. In the embodiment in which the battery cell 21 is a soft-pack battery cell and the battery module 20 is not provided with the third heat-conducting member 27, the two sides of the battery cell 21 along the first direction X are both arc sides. The surface of the first protruding part 125 facing the battery cell 21 is a first arc surface 1251 that matches part of the arc side of the battery cell 21, so that after the first protruding part 125 extends between the two adjacent battery cells 21, the first protruding part 125 has the largest possible contact area with the battery cell 21, and the battery cell 21 and the first side plate 12 can directly conduct heat, which is conducive to improving the heat dissipation capacity. Figure 32 ​As shown, the surface of the second protruding part 135 facing the battery cell 21 is a second arc surface 1351. In the embodiment in which the battery cell 21 is a soft package battery cell and the battery module 20 is not provided with the third heat conduction member 27, both sides of the battery cell 21 in the first direction X are arc sides, and the surface of the second protruding part 135 facing the battery cell 21 is a second arc surface 1351 that matches a partial area of the arc side of the battery cell 21, so that the second protruding part 135 has a maximum contact area with the battery cell 21 after extending between the two adjacent battery cells 21, and the battery cell 21 and the second side plate 13 can directly conduct heat, which is conducive to further improving the heat dissipation capacity.

[0224] In the embodiment in which the battery module 20 is provided with the third heat conduction member 27, the inner surface 121 of the first side plate can not be provided with the first protruding part 832, and the inner surface 131 of the second side plate can not be provided with the second protruding part 932, which is convenient for arranging the third heat conduction member 27.

[0225] The number of the first protruding parts 125 provided on the first side plate 12 and the number of the second protruding parts 135 provided on the second side plate 13 can be the same or different.

[0226] One end of the two adjacent battery cells 21 in the first direction X can have the first protruding part 125 extending between the two adjacent battery cells 21, so as to increase the contact area and improve the heat dissipation capacity. The other end of the two adjacent battery cells 21 in the first direction X can also have the second protruding part 135 extending between the two adjacent battery cells 21, so as to further increase the contact area and further improve the heat dissipation capacity.

[0227] The first protruding part 125 can be inserted between every two adjacent battery cells 21, so that every two adjacent battery cells 21 have a large heat dissipation area, thereby improving the heat dissipation capacity. Alternatively, the first protruding part 125 can be inserted between part of the two adjacent battery cells 21, which can reduce the number of the first protruding parts 125 on the first side plate 12 and facilitate the processing of the first side plate 12.

[0228] The second protruding part 135 can be inserted between every two adjacent battery cells 21, so that every two adjacent battery cells 21 have a large heat dissipation area, thereby further improving the heat dissipation capacity. Alternatively, the second protruding part 135 can be inserted between part of the two adjacent battery cells 21, which can reduce the number of the first protruding parts 125 on the second side plate 13 and facilitate the processing of the second side plate 13.

[0229] There are several ways to form the first protrusion 125. For example, the first protrusion 125 and the first side plate 12 can be separately provided. The first protrusion 125 can be connected to the inner surface 121 of the first side plate by welding, bonding, or other methods, thereby realizing the first protrusion 125 on the inner surface 121 of the first side plate. Alternatively, the first protrusion 125 can also be formed by stamping the first side plate 12. Similarly, there are several ways to form the second protrusion 135. For example, the second protrusion 135 and the second side plate 13 can be separately provided. The second protrusion 135 can be connected to the inner surface 131 of the second side plate by welding, bonding, or other methods, thereby realizing the second protrusion 135 on the inner surface 131 of the second side plate. Alternatively, the second protrusion 135 can also be formed by stamping the second side plate 13.

[0230] like Figure 31 , Figure 32 As shown, in some embodiments, a first recess 126 is formed on the outer surface 122 of the first side plate at a position corresponding to the first protrusion 125. A second recess 136 is formed on the outer surface 132 of the second side plate at a position corresponding to the second protrusion 135. The provision of the first recess 126 and the second recess 136 can increase the heat dissipation area of ​​the first side plate 12 and the second side plate 13 to the outside, thereby improving the heat dissipation efficiency.

[0231] The shape of the first recess 126 can be the same as the shape of the first protrusion 125, that is, when viewed along the second direction Y, the shape of the first recess 126 and the shape of the first protrusion 125 are the same. The first recess 126 can be a groove formed by a grooving process. After the first recess 126 is formed, the thickness of the first side plate 12 at the position corresponding to the first recess 126 is less than the thickness at other positions of the first side plate 12. The shape of the second recess 136 can be the same as the shape of the second protrusion 135, that is, when viewed along the second direction Y, the shape of the second recess 136 and the shape of the second protrusion 135 are the same. The second recess 136 can be a groove formed by a grooving process. After the second recess 136 is formed, the thickness of the second side plate 13 at the position corresponding to the second recess 136 is less than the thickness at other positions of the second side plate 13.

[0232] The first recess 126 can also be formed by stamping the first side plate 12, in which the first recess 126 is formed by stamping inwardly on the outer surface 122 of the first side plate, and the inner surface 121 of the first side plate protrudes at the position corresponding to the first recess 126, thereby forming the first protrusion 125, i.e., the first protrusion 125 and the first recess 126 are formed by stamping, and the forming method of the first protrusion 125 and the first recess 126 is simple. The second recess 136 can also be formed by stamping the second side plate 13, in which the second recess 136 is formed by stamping inwardly on the outer surface 132 of the second side plate, and the inner surface 131 of the second side plate protrudes at the position corresponding to the second recess 136, thereby forming the second protrusion 135, i.e., the second protrusion 135 and the second recess 136 are formed by stamping, and the forming method of the second protrusion 135 and the second recess 136 is simple.

[0233] The first recess 126 and the first protrusion 125 can also be formed by synchronous casting or injection molding when the shell 10 is formed by casting, injection molding, etc. Similarly, the second recess 136 and the second protrusion 135 can also be formed by synchronous casting or injection molding when the shell 10 is formed by casting, injection molding, etc.

[0234] As shown in FIG. 1, Figures 33-36 In some embodiments, the first side plate 12 is provided with a first through hole 127, which penetrates the first side plate 12 in the first direction, and the first through hole 127 communicates with part of the first space 2310. The first through hole 127 is configured to place the first insulating material in the first space to form the first gel D1. Optionally, the first gel D1 is partially located in the first through hole 127.

[0235] In some embodiments, the first insulating material includes foaming glue, and the first insulating material is foamed and solidified to form the first gel D1.

[0236] In some embodiments, the first insulating material includes potting glue, and the first insulating material is solidified to form the first gel D1.

[0237] The second side plate 13 is provided with a second through hole 137, which penetrates the second side plate 13 in the first direction, and the second through hole 137 communicates with part of the first space, which is conducive to the flow and inspection of the first insulating material. Optionally, the first gel D1 is partially located in the second through hole 137.

[0238] In some embodiments, the projection of the first through hole 127 and the projection of the third through hole 1511 overlap in the first direction X, which is conducive to the flow of the first insulating material.

[0239] The first through hole 127 and the second through hole 137 both overlap the space between the sealing portions 231 of the two adjacent battery cells 21 when viewed along the first direction X. The first gel D1 can fill the space between the sealing portions 231 of the two adjacent battery cells 21 by injecting the first gel D1 into the box Q through the first through hole 127 and / or the second through hole 137. The first gel D1 can improve the heat conduction between the battery cell 21 and the box Q. The second through hole 137 is also conducive to the ventilation and heat dissipation of the battery pack 100, thereby improving the heat dissipation capacity of the battery pack 100. The first gel D1 filled in the space between the sealing portions 231 of the two adjacent battery cells 21 is conducive to relieving the deformation problem of the two adjacent battery cells 21. Injecting the first gel D1 into the box Q is also conducive to improving the air tightness of the battery pack 100.

[0240] The first through hole 127 penetrates the first side plate 12 along the first direction X. The first through hole 127 overlaps the space between the sealing portions 231 of the two adjacent battery cells 21 when viewed along the first direction X, specifically, the first through hole 127 overlaps the space between the second sealing portions 2312 of the two adjacent battery cells 21 when viewed along the first direction X. Then the first gel D1 can be injected into the space between the sealing portions 231 of the two adjacent battery cells 21 through the first through hole 127. After injecting the first gel D1 into the space between the sealing portions 231 of the two adjacent battery cells 21, the foam between the sealing portions 231 of the two adjacent battery cells 21 can be cancelled.

[0241] The second through hole 137 penetrates the second side plate 13 along the first direction X. The second through hole 137 overlaps the space between the sealing portions 231 of the two adjacent battery cells 21 when viewed along the first direction X, specifically, the second through hole 137 overlaps the space between the second sealing portions 2312 of the two adjacent battery cells 21 when viewed along the first direction X. Then the first gel D1 can also be injected into the space between the sealing portions 231 of the two adjacent battery cells 21 through the second through hole 137. The first through hole 127 and the second through hole 137 can overlap when viewed along the first direction X.

[0242] Of course, the first gel D1 can also be injected into the box Q through the first through hole 127 and the second through hole 137 at the same time, which can improve the injection efficiency of the gel.

[0243] The amount of the first gel D1 injected from the first through hole 127 or the second through hole 137 is sufficient, and the first gel D1 can completely fill the space between the first end plate 80 and the battery module 20. The first gel D1 can coat the first circuit board 26 to improve the sealing performance.

[0244] Part of the first gel D1 is connected to the first circuit board 26 to improve the heat dissipation of the first circuit board.

[0245] As Figures 37-38As shown, in some embodiments, the first side plate 12 is provided with a first side plate opening 128 penetrating the first side plate 12 along the first direction X, and the housing 10 further comprises a first heat dissipation fin 130 covering the first side plate opening 128 and connected with the first side plate 12. The second side plate 13 is provided with a second side plate opening 138 penetrating the second side plate 13 along the first direction X, and the housing 10 further comprises a second heat dissipation fin 140 covering the second side plate opening 138 and connected with the second side plate 13.

[0246] The first side plate 12 is provided with a first side plate opening 128, the first heat dissipation fin 130 is connected to the first side plate 12 and covers the first side plate opening 128, the second side plate 13 is provided with a second side plate opening 138, and the second heat dissipation fin 140 is connected to the second side plate 13 and covers the second side plate opening 138. The battery module 20 can be cooled by the first heat dissipation fin 130 and the second heat dissipation fin 140, further improving the heat dissipation efficiency.

[0247] The shape of the first side plate opening 128 can be various, such as a circular hole, a square hole, a rectangular hole, etc. The shape of the second side plate opening 138 can be various, such as a circular hole, a square hole, a rectangular hole, etc.

[0248] The first heat dissipation fin 130 is connected to the first side plate 12. The connection between the first heat dissipation fin 130 and the first side plate 12 can be various, such as welding connection, bolt connection, clamping connection, etc.

[0249] The first heat dissipation fin 130 covering the first side plate opening 128 means that part or all of the first heat dissipation fin 130 is located in the first side plate opening 128 as viewed along the first direction X. The first heat dissipation fin 130 is provided with a first heat dissipation fin portion 1301 facing outward, and the first heat dissipation fin portion 1301 of the first heat dissipation fin 130 is provided away from the battery module 20 along the first direction X. The surface of the first heat dissipation fin 130 facing the battery module 20 and the inner surface 121 of the first side plate are located in the same plane, which is convenient for the installation of the structure inside the housing 10.

[0250] The first side plate 12 can be provided with one first side plate opening 128, or multiple first side plate openings 128. In embodiments where the first side plate 12 is provided with multiple first side plate openings 128, one first heat dissipation fin 130 can be provided for each first side plate opening 128. As viewed along the first direction X, the area of the first heat dissipation fin 130 is greater than the area of the region of the first side plate 12 where no first side plate opening 128 is provided, so that the heat dissipation area is large enough to improve the heat dissipation capacity.

[0251] The shape of the second side plate opening 138 can be various, such as a circular hole, a square hole, a rectangular hole, etc.

[0252] The second heat dissipation fin 140 is connected to the second side plate 13. The connection between the second heat dissipation fin 140 and the second side plate 13 can be various, such as welding connection, bolt connection, clamping connection, etc.

[0253] The second heat dissipation fin 140 covers the second side plate opening 138, which means that part or all of the second heat dissipation fin 140 is located in the second side plate opening 138 when viewed along the first direction X. The second heat dissipation fin 140 is outwardly arranged, and the second heat dissipation fin 140 is arranged away from the battery module 20 along the first direction X. The surface of the second heat dissipation fin 140 facing the battery module 20 and the inner surface of the side plate are located in the same plane, which is convenient for the installation of the structure inside the shell 10.

[0254] The second side plate 13 can be provided with one second side plate opening 138, or can be provided with multiple second side plate openings 138. In the embodiment in which the second side plate 13 is provided with multiple second side plate openings 138, one second heat dissipation fin 140 can be provided corresponding to each second side plate opening 138. When viewed along the first direction X, the area of the second heat dissipation fin 140 is larger than the area of the region of the second side plate 13 which is not provided with the second side plate opening 138, so that the heat dissipation area is large enough to improve the heat dissipation capacity.

[0255] The structures of the first side plate 12 and the second side plate 13 can be the same, such as the first side plate 12 and the second side plate 13 can both adopt the structure of providing a protruding part on the inner surface, or the first side plate 12 and the second side plate 13 both adopt the structure of providing a side plate opening and a heat dissipation fin covering the side plate opening.

[0256] The structures of the first side plate 12 and the second side plate 13 can also be different, such as the first side plate 12 is provided with a first protruding part 125 on the inner surface, and the second side plate 13 is provided with a second side plate opening 138 and a second heat dissipation fin 140 covering the second side plate opening 138.

[0257] In an embodiment where the first side plate 12 has a first side plate opening 128 and a first heat dissipation fin 130 covers the first side plate opening 128, the inner surface of the area of ​​the first side plate 12 where the first side plate opening 128 is not provided may also have a first protrusion 125. In an embodiment where the second side plate 13 has a second side plate opening 138 and a second heat dissipation fin covers the second side plate opening 138, the inner surface of the area of ​​the second side plate 13 where the second side plate opening 138 is not provided may also have a second protrusion 135. In this way, the first side plate 12 and the second side plate 13 can dissipate heat through the heat dissipation fins and also through the contact between the first protrusion 125 and the second protrusion 135 and the battery cell 21, further improving the heat dissipation efficiency.

[0258] like Figure 2 , Figure 39 As shown, in some embodiments, the battery pack 100 further includes a bracket 150 located between the housing Q and the cover 110, with the housing Q and the cover 110 respectively connected to the bracket 150, and a second circuit board 120 located between the bracket 150 and the cover 110.

[0259] The bracket 150 is located between the housing Q and the cover 110, and the second circuit board 120 is located between the bracket 150 and the cover 110, which facilitates the installation and fixation of the second circuit board 120. The bracket 150 can also act as a separator between the second circuit board 120 and the battery module 20, reducing the risk of interference between the second circuit board 120 and the battery module 20.

[0260] The bracket 150 can be connected to the first end plate 80, the second end plate 90, the housing 10, and the cover 110. The bracket 150 and the first end plate 80, the second end plate 90, the housing 10, and the cover 110 can be detachably connected, such as by bolts or screws. For example,... Figure 1 , Figure 39 As shown, the bracket 150 is provided with multiple tenth threaded holes 1501. Some of the tenth threaded holes 1501, the seventh threaded hole 86, and the ninth threaded hole 1101 are arranged coaxially. Bolts are threaded through the eleventh threaded hole 15071, the seventh threaded hole 86, and the ninth threaded hole 1101 in sequence. Another part of the tenth threaded holes 1501, the eighth threaded hole 96, and a part of the ninth threaded hole 1101 are arranged coaxially. Bolts are threaded through the tenth threaded hole 1501, the eighth threaded hole 96, and the ninth threaded hole 1101 in sequence, thereby realizing the connection of the cover 110, the bracket 150, and the two end plates (the first end plate 80 and the second end plate 90).

[0261] In some embodiments, a portion of the bracket 150 is accommodated in the box Q, and another portion of the bracket 150 abuts the open end of the box Q. In the third direction Z, the bracket 150 has oppositely arranged first and second surfaces 1502 and 1503, the first surface 1502 faces the cover 110, and the second surface 1503 faces the battery module 20, and the tenth threaded hole 1501 penetrates the first and second surfaces 1502 and 1503. The bracket 150 has a protrusion 1504 protruding from the second surface 1503 towards the battery module 20, and the protrusion 1504 extends from the first opening Q1 into the box Q. The second surface 1503 abuts the open end of the box Q. A plurality of tenth threaded holes 1501 are arranged on the outer periphery of the protrusion 1504. The protrusion 1504 extends from the first opening Q1 into the box Q, and can limit the battery module 20 together with the bottom plate 11.

[0262] As shown in Figure 2 , Figures 40-43 In some embodiments, in the third direction Z, the first surface 1502 of the bracket 150 facing the cover 110 is provided with a receiving portion 1505 recessed from the first surface 1502 in the third direction Z towards the battery module 20, and a protrusion 1504 is formed on the second surface 1503 of the bracket 150 away from the cover 110. The second surface 1503 abuts the open end of the box Q, and the protrusion 1504 is inserted into the box Q.

[0263] As shown in Figure 40 , the receiving portion 1505 is provided with longitudinally and transversely intersecting reinforcing ribs 1506 for increasing the strength of the bracket 150. The receiving portion 1505 is also provided with connecting columns 1507 for fixing the second circuit board 120. The connecting columns 1507 extend out of the receiving portion 1505 in the third direction Z, and the connecting columns 1507 are provided with eleventh threaded holes 15071, and the second circuit board 120 can be connected to the connecting columns 1507 by bolts. The receiving portion 1505 is provided with four connecting columns 1507, which are distributed at the four corners of a rectangle.

[0264] In other embodiments, the bracket 150 can only form the receiving portion 1505 on the first surface 1502, and the side of the bracket 150 away from the cover 110 is a plane without the protrusion 1504, so that the bracket 150 does not occupy the space inside the box Q, which is beneficial to improve the energy density of the battery pack 100.

[0265] In other embodiments, the bracket 150 can not form the receiving portion 1505 on the first surface 1502, and can only form the receiving portion 1505 on the first surface 1502, which simplifies the structure of the bracket 150 and reduces the processing difficulty.

[0266] In other embodiments, the bracket 150 can also be a flat plate structure.

[0267] As shown in FIG. 1, the bracket 150 is provided with a plurality of first threaded holes 1501. The first threaded holes 1501 can be arranged on the first surface 1502 of the bracket 150. Figure 43 、 Figure 44 As shown in FIG. 1, the bracket 150 is also provided with a plurality of twelfth threaded holes 1508. The twelfth threaded holes 1508 can be arranged on the protrusions, specifically on the areas where the protrusions overlap with the first side plate 12 and the second side plate 13.

[0268] The first side plate 12 is further provided with a thirteenth threaded hole 129, and the second side plate 13 is further provided with a fourteenth threaded hole 139. Part of the twelfth threaded holes 1508 and the thirteenth threaded holes 129 are coaxially arranged, and the other part of the twelfth threaded holes 1508 and the fourteenth threaded holes 139 are coaxially arranged. The bolts are threadedly connected with the twelfth threaded holes 1508 and the thirteenth threaded holes 129, thereby achieving the connection between the first side plate 12 and the bracket 150. The bolts are threadedly connected with the fourteenth threaded holes 139 and the twelfth threaded holes 1508, thereby achieving the connection between the second side plate 13 and the bracket 150, and further achieving the connection between the bracket 150 and the shell 10.

[0269] The bracket 150 and the first end plate 80, the second end plate 90, the shell 10, and the cover 110 can also be connected in other ways, such as welding connection, adhesive connection, etc.

[0270] In some embodiments, the battery module 20 is located between the bracket 150 and the bottom plate 11, and the bracket 150 is in contact with the battery module 20.

[0271] The bracket 150 is in contact with the battery module 20, which is conducive to the bracket 150 and the bottom plate 11 of the shell 10 jointly limiting the battery module 20, alleviating the problem of battery module 20 movement, and improving the safety performance of the battery pack 100.

[0272] In the embodiments where the bracket 150 is provided with the accommodating portion 1505 and the protrusion 1504, after the protrusion 1504 is inserted into the box Q, the surface of the protrusion 1504 away from the cover 110 is in contact with the battery module 20. In the embodiments where the bracket 150 is provided with the accommodating portion 1505 and is not provided with the protrusion 1504, and in the embodiments where the bracket 150 is a flat plate structure, the second surface 1503 of the bracket 150 away from the cover 110 not only abuts against the open end of the box Q, but also is in contact with the battery module 20.

[0273] The bracket 150 is in contact with the battery module 20, and the bracket 150 can exert pressure on the battery module 20. The bracket 150 can exert pressure on the battery module 20 after the battery cell 21 is cyclically expanded, or the bracket 150 can exert pressure on the battery module 20 before the battery cell 21 is cyclically expanded.

[0274] Of course, in other embodiments, the bracket 150 and the battery module 20 can also not be in contact.

[0275] In some embodiments, a third seal (not shown in the figure) is provided between one end of the housing Q forming the first opening Q1 and the bracket 150, the third seal connecting the opening end of the housing Q and the bracket 150.

[0276] A third sealing element is provided between the end of the housing Q forming the first opening Q1 and the bracket 150, which helps to improve the airtightness of the battery pack 100, thereby improving the safety performance of the battery pack 100 and extending the service life of the battery pack 100.

[0277] The third seal can be a solid rubber gasket. Alternatively, the third seal can be formed by curing sealant applied between the opening of the housing Q and the bracket 150.

[0278] like Figure 41 , Figure 45 As shown, in some embodiments, the bracket 150 is provided with a third groove 1509 on the side facing the box Q. The third groove 1509 extends circumferentially along the first opening Q1. One end of the box Q forming the first opening Q1 is inserted into the third groove 1509, and the third seal is received in the third groove 1509.

[0279] A third groove 1509 is provided on the side of the bracket 150 facing the housing Q. One end of the housing Q forming the first opening Q1 is inserted into the third groove 1509, allowing the housing Q and the bracket 150 to be accurately positioned relative to each other. Furthermore, the bracket 150 and the housing Q have an overlapping area in the recessed direction of the third groove 1509, sharing a portion of the space. This reduces the size of the battery pack 100, facilitating its miniaturization. The third seal is housed within the third groove 1509, ensuring stable installation of the third seal.

[0280] The second surface 1503 of the bracket 150 facing the battery module 20 is also provided with a limiting part 1510. The limiting part 1510 protrudes from the second surface 1503 in the third direction (Z) towards the battery module 20. The limiting part 1510 extends circumferentially along the first opening Q1 of the housing Q and surrounds the outer periphery of the protrusion 1504. The surface of the limiting part 1510 facing the protrusion 1504, the second surface 1503, and the outer peripheral surface of the protrusion 1504 together define a third groove 1509. The surface of the limiting part 1510 facing the protrusion 1504 and the outer peripheral surface of the protrusion 1504 limit the housing Q on the inner and outer sides of the first side plate 12, the inner and outer sides of the second side plate 13, the inner and outer sides of the first end plate 80, and the inner and outer sides of the second end plate 90, respectively.

[0281] The third seal can be partially or completely housed within the third groove 1509.

[0282] The third seal can be a solid rubber gasket. Alternatively, the third seal can be formed by curing a liquid sealant applied to the third groove 1509.

[0283] like Figure 40 , Figure 41 , Figure 42 As shown, in some embodiments, the bracket 150 is provided with a third through hole 1511, which is configured to allow a second insulating material to be injected into the housing Q and cured to form the second colloid D2. Optionally, the second insulating material includes expanding foam. Optionally, the second insulating material includes potting compound.

[0284] The second colloid D2 is injected into the housing Q through the third through-hole 1511. The second colloid D2 fills the accessible gaps within the housing Q, improving its airtightness. The second colloid D2 also enhances the thermal conductivity between the battery module 20 and the housing Q, thereby improving the heat dissipation capacity of the battery pack 100. The presence of the second colloid D2 within the housing Q helps mitigate the problem of battery module 20 movement, thus improving the safety performance of the battery pack 100.

[0285] Along the third direction Z, the third through hole 1511 penetrates the bracket 150 and communicates with the receiving space of the box Q. The second colloid D2 is injected into the box Q through the third through hole 1511 to fill the space inside the box Q.

[0286] The second colloid, D2, can be a colloid with good thermal conductivity. After curing, the second colloid, D2, can also act as a connector within the enclosure Q, thereby improving the installation stability of the various structures within the enclosure Q.

[0287] In some embodiments, the amount of the second colloid D2 injected into the housing Q through the third through hole 1511 should not overflow from the third through hole 1511.

[0288] In some embodiments, the bracket 150 is provided with two third through holes 1511, which are arranged at intervals along the second direction Y. When viewed along the third direction Z, the space between the first end plate 80 and the battery module 20 overlaps with one of the two third through holes 1511, and the space between the second end plate 90 and the battery module 20 overlaps with the other of the two third through holes 1511.

[0289] In the third direction Z, the space between the first end plate 80 and the battery module 20 overlaps with one third through hole 1511, and the space between the second end plate 90 and the battery module 20 overlaps with another third through hole 1511. The second adhesive D2 can be injected into the space between the first end plate 80 and the battery module 20 and the space between the second end plate 90 and the battery module 20 through the corresponding third through hole 1511, which can improve the efficiency of injecting the adhesive and facilitate the uniform distribution of the second adhesive D2 in the box Q.

[0290] In some embodiments, in the third direction Z, the projection of the third through hole 1511 and the projection of the electrode assembly are separated, which limits the wrapping of the second insulating material to the packaging body 232 and reduces the influence of the second adhesive D2 on the expansion of the battery cell 21.

[0291] As shown in Figures 46-49 In some embodiments, the bracket 150 is provided with two third through holes 1511, and the two third through holes 1511 are arranged at intervals in the third direction Z.

[0292] In the third direction Z, one of the two third through holes 1511 overlaps with the space between the first end plate 80 and the battery module 20 (as shown in Figure 48 In the third direction Z, the other of the two third through holes 1511 overlaps with the space between the second end plate 90 and the battery module 20 (as shown in Figure 49 Therefore, the second adhesive D2 can be injected into the space between the first end plate 80 and the battery module 20 and the space between the second end plate 90 and the battery module 20 through the two third through holes 1511, respectively.

[0293] In the embodiment in which the first side plate 12 is provided with the first through hole 127 and the second side plate 13 is provided with the second through hole 137, the bracket 150 can not be provided with the third through hole 1511, and the first adhesive D1 can be filled into the space between the first end plate 80 and the battery module 20 and the space between the second end plate 90 and the battery module 20 only through the second through hole 137, thereby simplifying the structure of the bracket 150.

[0294] In the embodiment in which the bracket 150 is provided with the third through hole 1511, the first side plate 12 can not be provided with the first through hole 127, and the second side plate 13 can not be provided with the second through hole 137. The second adhesive D2 can be injected into the box Q only through the third through hole 1511, thereby simplifying the structure of the first side plate 12 and the second side plate 13.

[0295] Of course, the first through hole 127 can be provided on the first side plate 12, the second through hole 137 can be provided on the second side plate 13, and the third through hole 1511 can be provided on the bracket 150. The second through hole 137 and the third through hole 1511 can be used to inject the adhesive into the box Q synchronously, which can improve the efficiency of injecting the adhesive.

[0296] In the present application, the first and second colloids D1 and D2 can be the same or different in material. The first and second colloids D1 and D2 can be insulating glue.

[0297] In some embodiments, a fourth seal (not shown in the figure) is arranged between the cover 110 and the bracket 150.

[0298] The third seal arranged between the cover 110 and the bracket 150 is conducive to improving the air tightness of the battery pack 100, thereby improving the safety performance of the battery pack 100 and prolonging the service life of the battery pack 100.

[0299] The fourth seal can be a solid rubber pad. The fourth seal can also be formed after the sealant coated between the cover 110 and the bracket 150 is cured. As shown in Figure 30 、 Figure 50 In some embodiments, the side of the cover 110 facing the bracket 150 is provided with a fourth groove 1102, the fourth groove 1102 extends along the circumference of the first opening Q1, and at least part of the fourth seal is accommodated in the fourth groove 1102.

[0300] The side of the cover 110 facing the bracket 150 is provided with a fourth groove 1102, and at least part of the fourth seal is accommodated in the fourth groove 1102. The fourth seal and the cover 110 share a part of the space, which is conducive to reducing the volume of the battery pack 100, thereby facilitating the miniaturization of the structure of the battery pack 100.

[0301] The fourth groove 1102 is a closed structure closed along the circumference of the first opening Q1 of the box Q. The fourth seal is accommodated in the fourth groove 1102, that is, the fourth seal is embedded in the fourth groove 1102. Among them, the fourth seal can be fully accommodated in the fourth groove 1102, or partially accommodated in the fourth groove 1102.

[0302] The present application also provides a power consuming device, which includes a power consuming body and the battery pack 100 provided in any of the above embodiments. The power consuming device includes but is not limited to an energy storage system, an electric vehicle, an electric tool, a drone, etc. The battery pack 100 is used to provide electric energy for the power consuming body. The battery pack 100 provided in any of the above embodiments has good heat dissipation capacity and high heat dissipation efficiency, thereby making the safety performance of the battery pack 100 higher, which can meet the power consumption working conditions of the power consuming device with high rate, no static, continuous charging and discharging, and is also conducive to improving the power consumption safety of the power consuming device with the battery pack 100.

[0303] As shown in Figure 51 The present application also provides a manufacturing method of the battery pack 100, which includes:

[0304] S100, providing the shell 10, applying an external force to the shell 10 to deform the first side plate 12 and the second side plate 13 towards the direction away from each other;

[0305] S300, providing the battery module 20 and the first heat conducting member 30, and setting the first heat conducting member 30 on the first side plate 12 or the battery module 20;

[0306] S400, placing the battery module 20 between the first side plate 12 and the second side plate 13 away from each other along the direction perpendicular to the bottom plate 11;

[0307] S500, removing the external force to reset the first side plate 12 and the second side plate 13.

[0308] In S100, the force is applied to the first side plate 12 and the second side plate 13 away from each other, and the distance between the first side plate 12 and the second side plate 13 gradually increases along the direction away from the bottom plate 11, forming a larger first open end.

[0309] The first heat conducting member 30 can be a liquid heat conducting glue coated on the inner surface 121 of the first side plate, or a solid heat conducting glue fixed on the inner surface 121 of the first side plate. Alternatively, the first heat conducting member 30 can be a liquid heat conducting glue coated on the battery module 20, or a solid heat conducting glue fixed on the battery module 20.

[0310] Before performing S400, a second heat conducting member 50 can also be provided, and the second heat conducting member 50 is set on the second side plate 13 or the battery module 20.

[0311] The second heat conducting member 50 can be a liquid heat conducting glue coated on the inner surface 131 of the second side plate, or a solid heat conducting glue fixed on the inner surface 131 of the second side plate. Alternatively, the second heat conducting member 50 can be a liquid heat conducting glue coated on the battery module 20, or a solid heat conducting glue fixed on the battery module 20.

[0312] After removing the external force, the first side plate 12 and the second side plate 13 are reset and will squeeze the first heat conducting member 30 set between the first side plate 12 and the battery module 20, and the second heat conducting member 50 between the second side plate 13 and the battery module 20. In the embodiment that the first heat conducting member 30 is a liquid heat conducting glue coated on the inner surface 121 of the first side plate or the battery module 20, the liquid heat conducting glue is squeezed during the resetting process of the first side plate 12, which is beneficial to the diffusion of the liquid heat conducting glue between the first side plate 12 and the battery module 20. Similarly, in the embodiment that the second heat conducting member 50 is a liquid heat conducting glue coated on the inner surface 131 of the second side plate or the battery module 20, the liquid heat conducting glue is squeezed during the resetting process of the second side plate 13, which is beneficial to the diffusion of the liquid heat conducting glue between the second side plate 13 and the battery module 20.

[0313] Wherein, the first heat conduction member 30 is arranged on the first side plate 12 or the battery module 20, and the second heat conduction member 50 is arranged on the second side plate 13 or the battery module 20, which can be performed before or after the shell 10 is subjected to the external force.

[0314] As shown in Figure 52 the shell 10 is subjected to the external force, the first side plate 12 and the second side plate 13 are deformed in the direction away from each other, Figure 50 the first side plate 12 and the second side plate 13 shown by the solid line are the first side plate 12 and the second side plate 13 before the external force is applied, and the first side plate 12 and the second side plate 13 shown by the dashed line are the first side plate 12 and the second side plate 13 after the external force is applied. The first side plate 12 and the second side plate 13 are cantilever beams relative to the bottom plate 11.

[0315] By applying the external force to the shell 10, the first side plate 12 and the second side plate 13 are deformed in the direction away from each other, and a larger opening is formed at the end of the shell 10 away from the bottom plate 11, which provides space for the clamp to hold the battery module 20 into the shell 10. After the external force is removed, the first side plate 12 and the second side plate 13 are reset, and the distance between the first side plate 12 and the battery module 20 and the distance between the second side plate 13 and the battery module 20 can be very small, which can shorten the heat conduction path between the battery module 20 and the first side plate 12 of the shell 10 and between the battery module 20 and the second side plate 13, thereby improving the heat dissipation capacity of the battery pack 100.

[0316] In some embodiments, after the external force is removed, the manufacturing method of the battery pack 100 further comprises:

[0317] S600, providing two end plates, and fixedly connecting the two end plates to the two ends of the first side plate 12 and the second side plate 13, so that the shell 10 and the two end plates form a box Q with a first opening Q1, and the first opening Q1 is opposite to the bottom plate 11;

[0318] S700, providing a cover body 110, and the cover body 110 covers the first opening Q1.

[0319] The shell 10, the two end plates and the cover body 110 together define a space for accommodating the battery module 20, which provides better protection for the battery module 20.

[0320] After the external force is removed, the two end plates are connected to the two ends of the first side plate 12 and the second side plate 13, and the cover body 110 covers the first opening Q1 of the box Q, which is beneficial to improve the air tightness of the battery pack 100.

[0321] The above merely provides preferred embodiments of the present application, and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the principles and technical scope of the present application shall fall into the scope of the present application.

Claims

1. A battery pack, characterized by, The battery pack comprises: a shell in a U shape, the shell comprising a bottom plate, a first side plate and a second side plate, the first side plate and the second side plate being oppositely arranged along a first direction; a first end plate and a second end plate, the first end plate and the second end plate being oppositely arranged along a second direction, the first end plate, the second end plate and the shell forming a box body with a first opening opposite to the bottom plate; a battery module accommodated in the box body; a first reinforcing member in a U shape, the first reinforcing member being fixedly connected to an outer surface of the shell, the first reinforcing member covering a partial area of the outer surface of the shell, the first reinforcing member, the first side plate and the first end plate being sealingly connected; a second reinforcing member in a U shape, the second reinforcing member being fixedly connected to the outer surface of the shell, the second reinforcing member covering a partial area of the outer surface of the shell, the second reinforcing member, the second side plate and the second end plate being sealingly connected.

2. The battery pack of claim 1, wherein, The battery pack further comprises a first sealing member, the first end plate is provided with a first groove, at least a part of the first sealing member is located in the first groove, and a part of the first reinforcing member and the first side plate is arranged in the first groove.

3. The battery pack of claim 1, wherein, The battery pack further comprises a second sealing member, the second end plate is provided with a second groove, at least a part of the second sealing member is located in the second groove, and a part of the second reinforcing member and the second side plate is arranged in the first groove.

4. The battery pack of claim 1, wherein, The first reinforcing member is provided with a first clamping groove, the first end plate comprises a first end plate body and a first clamping portion, the first clamping portion is arranged at an edge of the first end plate body, and the first clamping portion is clamped in the first clamping groove.

5. The battery pack of claim 4, wherein, An included angle exists between an extension direction of the first clamping groove and the second direction.

6. The battery pack of claim 5, wherein, The first clamping portion comprises a first limiting plate and a first protrusion, the first limiting plate is connected to an edge of the first end plate body and is located on a side of the first reinforcing member away from the battery module along the first direction, and the first protrusion is protruded from a surface of the first limiting plate facing the first reinforcing member and clamped in the first clamping groove.

7. The battery pack of claim 4, wherein: A plurality of first fixing holes are arranged on the first end plate, second fixing holes are arranged on the first side plate and / or the first reinforcing member, and third fixing holes are arranged on the second side plate and / or the first reinforcing member, and the second fixing holes and the third fixing holes are respectively connected with the plurality of first fixing holes through first connecting members.

8. The battery pack of claim 7, wherein, Along a third direction, the second fixing holes and the third fixing holes are closer to the first opening than the first clamping groove.

9. The battery pack of claim 1, wherein, The second reinforcing member is provided with a second clamping groove, the second end plate comprises a second end plate body and a second clamping portion, the second clamping portion is arranged at an edge of the second end plate body, and the second clamping portion is clamped in the second clamping groove.

10. The battery pack of claim 9, wherein, An included angle exists between an extension direction of the second clamping groove and the second direction.

11. The battery pack of claim 9, wherein, The second clamping part comprises a second limiting plate and a second protrusion. The second limiting plate is connected to the edge of the second end plate body and is located on the side of the second reinforcing member away from the battery module along the first direction. The second protrusion is protruded from the surface of the second limiting plate facing the second reinforcing member and clamped in the second clamping groove.

12. The battery pack of claim 9, wherein, The second end plate is provided with a plurality of fourth fixing holes. The first side plate and / or the second reinforcing member is provided with a fifth fixing hole. The second side plate and / or the second reinforcing member is provided with a sixth fixing hole. The fifth fixing hole and the sixth fixing hole are connected with the plurality of fourth fixing holes through a second connecting member.

13. The battery pack of claim 12, wherein Along the third direction, the fifth fixing hole and the sixth fixing hole are closer to the first opening than the second clamping groove.

14. The battery pack of claim 1, wherein: Along the first direction, the thickness of the first side plate ranges from 0.5mm to 1.8mm, and the thickness of the second side plate ranges from 0.5mm to 1.8mm.

15. The battery pack of claim 1, wherein, The battery module is located between the first side plate and the second side plate. The battery module comprises a plurality of battery cells. Along the first direction, there is a first gap between the first side plate and the battery module. The battery pack further comprises a first heat-conducting member arranged in the first gap. The battery module and the first side plate are connected through the first heat-conducting member. The first side plate and the second side plate are configured to move away from each other under the action of an external force to place the battery module in the shell.

16. The battery pack of claim 15, wherein, Along the first direction, the length of the first gap ranges from 0.05mm to 2.5mm.

17. The battery pack of claim 1, wherein, Along the first direction, there is a second gap between the second side plate and the battery module. The battery pack further comprises a second heat-conducting member arranged in the second gap.

18. The battery pack of claim 17, wherein, Along the first direction, the length of the second gap ranges from 0.05mm to 2.5mm.

19. The battery pack of claim 1, wherein, The battery pack further comprises a cover body covering the first opening. The first end plate is provided with a seventh fixing hole. The second end plate is provided with an eighth fixing hole. The cover body is provided with a plurality of ninth fixing holes. Part of the plurality of ninth fixing holes is connected with the seventh fixing hole through a third connecting member. Another part of the plurality of ninth fixing holes is connected with the eighth fixing hole through a fourth connecting member.

20. The battery pack of claim 19, wherein, The first end plate comprises a first end plate body, a first connecting protrusion and a second connecting protrusion. The first connecting protrusion and the second connecting protrusion are connected to the edge of the first end plate body and are arranged at intervals along the first direction. The first connecting protrusion and the second connecting protrusion protrude away from the battery module. The first connecting protrusion is provided with the seventh fixing hole. The second connecting protrusion is provided with the seventh fixing hole. The first connecting protrusion is further provided with a first fixing hole for connecting with the first reinforcing member and / or the first side plate. The second connecting protrusion is further provided with the first fixing hole for connecting with the first reinforcing member and / or the second side plate.

21. The battery pack of claim 19, wherein, The second end plate comprises a second end plate body, a third connecting protrusion and a fourth connecting protrusion, the third connecting protrusion and the fourth connecting protrusion are both connected to the edge of the second end plate body and are arranged at intervals along the first direction, and the third connecting protrusion and the fourth connecting protrusion both protrude in a direction away from the battery module; The third connecting protrusion is provided with the eighth fixing hole, the fourth connecting protrusion is provided with the eighth fixing hole, the third connecting protrusion is further provided with a fourth fixing hole for connecting with the second reinforcing piece and / or the first side plate, and the fourth connecting protrusion is further provided with the fourth fixing hole for connecting with the second reinforcing piece and / or the second side plate.

22. An electrical device, comprising: A battery pack comprising any of the battery packs according to claims 1-21.

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