Battery module and electric equipment

Abstract

The invention discloses a battery module and electric equipment. The battery module comprises a plurality of cylindrical batteries and a plurality of busbars, and the busbars are connected with the cylindrical batteries. The cylindrical battery comprises a shell, an end cover and an electrode assembly, the shell comprises a bottom wall and a side wall connected with the bottom wall, the electrode assembly is contained in the shell, and the electrode assembly and the end cover are arranged in the axial direction of the cylindrical battery. The shell and the end cover have different polarities; one end, far away from the bottom wall, of the side wall is bent towards the axis of the cylindrical battery to form a bent part; the busbar comprises a main body part, a first connecting part and a second connecting part, the first connecting part is connected to the end cover of one cylindrical battery, and the second connecting part is connected to the end cover or the bottom wall of the other cylindrical battery; a first concave part is arranged on one side, facing the bending part, of the main body part; and the projection of the first concave part along the axial direction is partially overlapped with the projection of the bending part along the axial direction.

Description

Technical Field

[0001] The present application relates to the field of batteries, and in particular to a battery module and an electrical device. Background Art

[0002] Rechargeable batteries are batteries that can be recharged to activate the active materials after being discharged and continue to be used. Rechargeable batteries are widely used in electronic devices such as mobile phones, laptops, drones, etc.

[0003] A battery module usually includes multiple batteries to meet the voltage requirements of electronic devices. In the development of battery technology, how to improve the safety performance of battery modules has always been a research direction in the industry. Summary of the invention

[0004] The present application provides a battery module and an electrical device, which can improve safety performance.

[0005] In the first aspect, the present application provides a battery module, which includes a plurality of cylindrical batteries and a plurality of busbars, wherein the busbars connect the cylindrical batteries. The cylindrical battery includes a shell, an end cap, and an electrode assembly, wherein the shell includes a bottom wall and a side wall connected to the bottom wall, the end cap is connected to the side wall and insulated from the side wall, the electrode assembly is accommodated in the shell, and the electrode assembly and the end cap are arranged along the axial direction of the cylindrical battery; the shell and the end cap have different polarities; one end of the side wall away from the bottom wall is bent toward the axis of the cylindrical battery and forms a bending portion; the busbar includes a main body, a first connecting portion, and a second connecting portion, wherein the first connecting portion is connected to the end cap of one cylindrical battery, and the second connecting portion is connected to the end cap or the bottom wall of another cylindrical battery; a first recess is provided on the side of the main body facing the bending portion, and the projection of the first recess along the axial direction of the cylindrical battery partially overlaps with the projection of the bending portion along the axial direction of the cylindrical battery.

[0006] The first recessed portion can increase the axial distance between the main body and the bent portion of the cylindrical battery, extend the creepage distance, and reduce the possibility of overlap between the cylindrical battery shell and the bus bar, which is beneficial to reducing the short circuit risk of the battery module and improving the safety performance of the battery module.

[0007] In one or more of the above optional embodiments, in the axial direction of the cylindrical battery, the main body protrudes from the surface of the first connecting portion facing away from the end cap. Thus, the depth of the first recess can be increased, the spacing distance between the main body and the bent portion can be further increased, and the creepage distance can be further extended, which is conducive to further reducing the risk of short circuit.

[0008] In one or more optional embodiments above, the main body includes a bus section, a first bending section, and a second bending section, the first bending section connects the first connection part and the bus section, and the second bending section connects the second connection part and the bus section; the bus section, the first bending section, and the second bending section define a first recess. The first recess has a greater depth in the axial direction of the cylindrical battery, which is conducive to increasing the spacing between the bus section and the bending section, extending the creepage distance, and reducing the risk of short circuit.

[0009] In one or more of the above optional embodiments, in the axial direction of the cylindrical battery, the projection of the first bending section is separated from the projection of the bending portion of one cylindrical battery, and the projection of the second bending section is located within the projection of another cylindrical battery. In the axial direction of the cylindrical battery, neither the first bending section nor the second bending section overlaps with the bending portion of one cylindrical battery, and the bending portion is only arranged corresponding to the first recess of the busbar, which can increase the spacing distance between the bending portion and the busbar as much as possible, which is conducive to further extending the creepage distance and reducing the risk of short circuit.

[0010] In one or more optional embodiments above, the battery module further includes a first insulating member, the first insulating member is connected to the busbar; at least a portion of the first insulating member is accommodated in the first recess and is located between the main body and the bent portion. The first insulating member can insulate and isolate the main body from the bent portion, reduce the possibility of overlap between the main body and the bent portion, and help further reduce the risk of short circuit.

[0011] In one or more optional embodiments above, the first insulating member completely covers the first recess, thereby reducing the possibility of the main body and the bent portion being overlapped through other conductive structures, which is beneficial to further reduce the risk of short circuit.

[0012] In one or more of the above optional embodiments, the first insulating member wraps the main body. The entire outer surface of the main body is covered by the first insulating member, which can improve the connection stability between the first insulating member and the main body and reduce the risk of the first insulating member falling off the busbar. On the other hand, it can also increase the insulation area of ​​the first insulating member, which is conducive to further improving the insulation isolation effect.

[0013] In one or more optional embodiments above, the first insulating member includes a first insulating portion, a second insulating portion, and a third insulating portion, wherein the first insulating portion and the second insulating portion are respectively connected to two ends of the third insulating portion; the third insulating portion wraps the main body, the first insulating portion wraps the portion of the first connecting portion close to the main body, and the second insulating portion wraps the portion of the second connecting portion close to the main body. Thus, the wrapping area of ​​the busbar by the first insulating member is increased, which is conducive to improving the insulation effect of the first insulating member.

[0014] In one or more optional embodiments above, the cylindrical battery further includes an insulating film, which is sleeved on the housing, and a portion of the insulating film covers the bent portion in the axial direction of the cylindrical battery; the portion of the insulating film of a cylindrical battery is located between the bent portion and the main body in the axial direction of the cylindrical battery. The insulating film can at least shield the bent portion, insulate and isolate the bent portion from the main body, which is beneficial to reducing the short circuit risk of the cylindrical battery.

[0015] In one or more optional embodiments above, the cylindrical battery further includes a second insulating member, and in the axial direction of the cylindrical battery, at least a portion of the second insulating member is disposed between the bent portion and the insulating film. Along the axial direction of the cylindrical battery, the insulating film may cover at least a portion of the second insulating member, so as to coat and restrict the second insulating member through the insulating film, which is beneficial to improving the installation stability of the second insulating member. The second insulating member and the insulating film can have a dual insulating isolation effect. After the insulating film is damaged due to corrosion, scratches or other reasons, the second insulating member can still be used to achieve insulation isolation between the bent portion and the main body, which is beneficial to further reduce the short circuit risk of the cylindrical battery.

[0016] In one or more optional embodiments above, one cylindrical battery and another cylindrical battery are arranged along a first direction, the first direction is perpendicular to the axial direction of the cylindrical battery; and the second connecting portion is connected to the bottom wall of the other cylindrical battery.

[0017] In one or more of the above optional embodiments, the battery module further comprises a bracket, the bracket having a receiving cavity, and the plurality of cylindrical batteries are arranged in the receiving cavity. The bracket can exert a certain limiting effect on the cylindrical batteries in the receiving cavity, which is beneficial to reduce the shaking or vibration of the cylindrical batteries and improve the installation stability of the cylindrical batteries.

[0018] In one or more of the above optional embodiments, each accommodating cavity is provided with openings at both ends along the axial direction of the cylindrical battery; the first connecting portion is provided at one opening and connected to the end cover of one cylindrical battery, and the second connecting portion is provided at another opening and connected to the bottom wall of another cylindrical battery. By providing the opening, the bracket is convenient for the bracket to limit the cylindrical battery in the axial direction and for the busbar to be connected to the end cover and the bottom wall of the cylindrical battery. In addition, the first connecting portion and the second connecting portion are provided in the opening, and can share at least part of the axial space with the bracket, which is conducive to saving space and improving the compactness of the structure.

[0019] In one or more optional embodiments above, the bracket is provided with a second recessed portion on one side along the axial direction of the cylindrical battery, the second recessed portion communicates with an opening for accommodating the first connecting portion and another opening for accommodating the second connecting portion; at least part of the main body is accommodated in the second recessed portion. The second recessed portion can provide at least part of the accommodation space for the main body, and the main body and the bracket can share at least part of the space in the axial direction, which is conducive to saving space and improving the structural compactness and energy density of the battery module.

[0020] In one or more optional embodiments above, the bracket includes a protrusion, which protrudes from the bottom surface of the second recess; the main body includes a through hole, and the protrusion is inserted into the through hole. The plug-in fit between the protrusion and the through hole can limit the movement of the busbar relative to the bracket, and the bracket and the busbar can be pre-positioned by the plug-in fit between the protrusion and the through hole, which facilitates the assembly and connection of the busbar and the cylindrical battery.

[0021] In one or more optional embodiments above, in the axial direction of the cylindrical battery, a portion of the bracket is located between the main body and the bent portion of a cylindrical battery. The portion of the bracket located between the main body and the bent portion of a cylindrical battery can insulate and isolate the main body and the bent portion of a cylindrical battery, which is beneficial to further reduce the risk of short circuit.

[0022] In one or more optional embodiments above, the electrode assembly includes a first electrode terminal and a second electrode terminal with opposite polarities, the first electrode terminal is connected to the shell, and the second electrode terminal is connected to the end cap.

[0023] In a second aspect, the present application provides an electrical device comprising a battery module according to any embodiment of the first aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The features, advantages and technical effects of exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0025] Figure 1 A schematic diagram of the structure of a battery module provided in some embodiments of the present application;

[0026] Figure 2 for Figure 1 The schematic diagram of the exploded structure of the battery module shown;

[0027] Figure 3 for Figure 1 A schematic cross-sectional view of a cylindrical battery in the battery module shown;

[0028] Figure 4 for Figure 1 A schematic cross-sectional view of a battery module shown;

[0029] Figure 5 for Figure 4 A schematic diagram of the enlarged structure of the middle area A;

[0030] Figure 6 for Figure 1 A schematic diagram of the structure of the busbar and insulating member of the battery module shown;

[0031] Figure 7 for Figure 6 Schematic diagram of the decomposition structure;

[0032] Figure 8 for Figure 1 A schematic cross-sectional view of a busbar and an insulating member of the battery module shown;

[0033] Fig. 9 for Figure 8 Schematic diagram of the enlarged structure of area B in the middle.

[0034] Fig.10 A schematic diagram of the structure of electrical equipment provided in some embodiments of the present application.

[0035] The reference numerals of the specific embodiments are as follows:

[0036] Cylindrical battery 1, shell 10, shell opening 11, bottom wall 12, side wall 13, side wall body 131, bending portion 132, electrode assembly 20, first electrode end 21, second electrode end 22, end cap 30, explosion-proof disk 40, insulating film 60, first part 61, second part 62, third part 63, second insulating member 70, insulating gasket 80;

[0037] Busbar 2, main body 201, first recess 2011, bus section 2012, first bending section 2013, second bending section 2014, through hole 2015, first connecting portion 202, first surface 2021, second connecting portion 203, second surface 2031;

[0038] Bracket 3, first bracket 3a, second bracket 3b, accommodating cavity 301, opening 302, end wall 303, outer end surface 3031, peripheral wall 304, second recess 305, bottom surface 3051;

[0039] The first insulating member 4, the first insulating portion 401, the second insulating portion 402, the third insulating portion 403, the first insulator portion 4031, the second insulator portion 4032, the third insulator portion 4033;

[0040] Battery module 100;

[0041] Electrical equipment 1000;

[0042] Axis a, axial direction X, first direction Y. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments.

[0044] The terms "first", "second", "third", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship. In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments.

[0045] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection", etc. should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" also includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering. For example, if the angle between two directions is 85°-95°, the two directions can be considered to be perpendicular; if the angle between two directions is 0°-10°, the two directions can be considered to be parallel.

[0048] The battery module and electrical equipment of the present application are described below with reference to the accompanying drawings.

[0049] The present application embodiment provides a battery module 100, which includes a plurality of cylindrical batteries 1. The plurality of cylindrical batteries 1 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the plurality of cylindrical batteries 1 are connected in series and in parallel.

[0050] In some embodiments, the cylindrical battery 1 may be a lithium ion battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery, or other types of batteries.

[0051] Exemplarily, the cylindrical battery 1 may be a 21700 battery, a 18650 battery, a 46800 battery, a 49480 battery, or other types of cylindrical batteries.

[0052] In some embodiments, the cylindrical battery 1 is a secondary battery. After being discharged, the secondary battery can be charged to activate the active material and continue to be used.

[0053] In some embodiments, the cylindrical battery 1 includes a housing 10. The housing 10 includes a bottom wall 12 and a side wall 13 connected to the bottom wall 12. The bottom wall 12 may be provided at one end of the cylindrical battery 1 in its own axial direction X, and the other end of the cylindrical battery 1 in its own axial direction X may be provided with a housing opening 11, and the bottom wall 12 is arranged opposite to the housing opening 11 along the axial direction X of the cylindrical battery 1. The side wall 13 may surround the bottom wall 12 and be connected to the bottom wall 12, and the side wall 13 and the bottom wall 12 enclose a cylindrical space, and the cylindrical space is opened to the outside through the housing opening 11.

[0054] The bottom wall 12 and the side wall 13 may be an integrally formed structure, or may be connected by welding, riveting or other suitable means. In some embodiments, the cylindrical battery 1 further includes an electrode assembly 20 , which is accommodated in the housing 10 .

[0055] In some embodiments, the electrode assembly 20 includes a first electrode sheet and a second electrode sheet with opposite polarities. During the charge and discharge process of the cylindrical battery 1, active ions (such as lithium ions) are inserted and removed back and forth between the first electrode sheet and the second electrode sheet. One of the first electrode sheet and the second electrode sheet is a positive electrode sheet, and the other is a negative electrode sheet.

[0056] In some embodiments, the electrode assembly 20 includes a diaphragm disposed between the first electrode sheet and the second electrode sheet, and the diaphragm insulates the first electrode sheet from the second electrode sheet. The diaphragm is provided to reduce the risk of short circuit between the positive and negative electrode sheets, and allows active ions to pass through.

[0057] In some embodiments, the first electrode sheet includes a first electrode sheet body and a first electrode terminal 21, and the second electrode sheet includes a second electrode sheet body and a second electrode terminal 22. The first electrode sheet body includes a first current collector and a first active material layer coated on the surface of the first current collector, and the first electrode terminal 21 is connected to the first current collector. The second electrode sheet body includes a second current collector and a second active material layer coated on the surface of the second current collector, and the second electrode terminal 22 is connected to the second current collector. The polarities of the first electrode terminal 21 and the second electrode terminal 22 are opposite, and one of the first electrode terminal 21 and the second electrode terminal 22 can be a positive electrode ear, and the other can be a negative electrode ear.

[0058] In some embodiments, the cylindrical battery 1 further includes an end cover 30 , which is connected to the side wall 13 and insulated from the side wall 13 .

[0059] The end cap 30 and the bottom wall 12 can be arranged in the axial direction X of the cylindrical battery 1, and the end cap 30 can cover the shell opening 11 and close the shell opening 11, thereby forming a relatively closed accommodation space between the shell 10 and the end cap 30. The shell 10 and the end cap 30 can encapsulate components such as the electrode assembly 20 and the electrolyte.

[0060] Exemplarily, the end cap 30 and the side wall 13 may be insulated and isolated by an insulating gasket 80 .

[0061] In some embodiments, the material of the housing 10 and the end cap 30 can be steel, aluminum, composite metal or other conductive materials. The material of the housing 10 and the end cap 30 can be the same or different.

[0062] In some embodiments, the electrode assembly 20 and the end cap 30 are disposed along the axial direction X of the cylindrical battery 1 . In the axial direction X of the cylindrical battery 1 , the electrode assembly 20 may be disposed between the end cap 30 and the bottom wall 12 .

[0063] In some embodiments, the housing 10 and the end cap 30 have different polarities. Exemplarily, one of the housing 10 and the end cap 30 is positive polarity and the other is negative polarity. In some embodiments, the electrode assembly 20 includes a first electrode terminal 21 and a second electrode terminal 22 with opposite polarities. The first electrode terminal 21 is connected to the housing 10, and the second electrode terminal 22 is connected to the end cap 30. The housing 10 and the end cap 30 respectively form two electrode terminals of the cylindrical battery 1, eliminating the traditional electrode terminals, which is conducive to simplifying the structure of the cylindrical battery 1.

[0064] Optionally, the first electrode terminal 21 may be in direct contact with and connected to the bottom wall 12 .

[0065] In some embodiments, one end of the side wall 13 away from the bottom wall 12 is bent toward the axis a of the cylindrical battery 1 to form a bent portion 132 .

[0066] The bent portion 132 can enclose the housing opening 11 , and along the axial direction X of the cylindrical battery 1 , the bent portion 132 is disposed opposite to the bottom wall 12 .

[0067] In some embodiments, the cylindrical battery 1 further includes an explosion-proof sheet 40, which is disposed on the end cap 30. When the air pressure inside the cylindrical battery 1 exceeds the upper limit that the explosion-proof sheet 40 can withstand, the air pressure inside the cylindrical battery 1 can cause the explosion-proof sheet 40 to flip and explode away from the electrode assembly 20, thereby achieving the purpose of power off and pressure relief, which is beneficial to reducing the risk of explosion of the cylindrical battery 1 due to excessive internal air pressure and improving the safety performance of the cylindrical battery 1.

[0068] In some embodiments, the side wall 13 further includes a side wall body 131, the side wall body 131 surrounds the bottom wall 12 and is connected to the bottom wall 12, and one end of the side wall body 131 close to the bottom wall 12 along the axial direction X is directly connected to the bottom wall 12. The bending portion 132 extends from one end of the side wall body 131 away from the bottom wall 12 and bends toward the axis a of the cylindrical battery 1.

[0069] In some embodiments, in the axial direction X of the cylindrical battery 1 , part of the bent portion 132 is located on a side of the end cover 30 facing away from the bottom wall 12 .

[0070] In the axial direction X of the cylindrical battery 1, a portion of the end cap 30 is located between the bent portion 132 and the electrode assembly 20. The bent portion 132 can have a certain limiting effect on the end cap 30 in the arrangement direction of the end cap 30 and the electrode assembly 20, which is beneficial to improving the structural stability of the end cap 30.

[0071] In some embodiments, the battery module 100 further includes a plurality of bus bars 2, and the bus bars 2 are connected to the cylindrical batteries 1. The cylindrical batteries 1 can be connected in series or in parallel via the bus bars 2.

[0072] In some embodiments, the busbar 2 may include a main body 201, a first connection portion 202, and a second connection portion 203. The first connection portion 202 is connected to the end cap 30 of one cylindrical battery 1, and the second connection portion 203 is connected to the end cap 30 or the bottom wall 12 of another cylindrical battery 1.

[0073] In some examples, the arrangement directions of two adjacent cylindrical batteries 1 are opposite. In the axial direction X of the cylindrical battery 1, the end caps 30 of the two adjacent cylindrical batteries 1 are respectively located on opposite sides, and the first connection portion 202 and the second connection portion 203 of the busbar 2 are respectively connected to the end cap 30 of one cylindrical battery 1 and the bottom wall 12 of the other cylindrical battery 1, thereby connecting the two cylindrical batteries 1 in series.

[0074] In other examples, the arrangement directions of two adjacent cylindrical batteries 1 are the same. In the axial direction X of the cylindrical battery 1, the end caps 30 of the two adjacent cylindrical batteries 1 are located on the same side, and the first connection portion 202 and the second connection portion 203 of the busbar 2 are respectively connected to the end caps 30 of the two adjacent cylindrical batteries 1, thereby connecting the two adjacent cylindrical batteries 1 in parallel.

[0075] The first connection portion 202 and the second connection portion 203 may be connected through the main body portion 201. The main body portion 201 may be located between the first connection portion 202 and the second connection portion 203.

[0076] The main body 201, the first connection part 202 and the second connection part 203 may be an integrally formed structure. The main body 201 and the first connection part 202, and the main body 201 and the second connection part 203 may also be connected by welding, riveting or other appropriate methods.

[0077] In some embodiments, the main body 201 is spaced apart from the bending portion 132 of a cylindrical battery 1 in the axial direction X of the cylindrical battery 1. In other words, the main body 201 and the bending portion 132 are arranged along the axial direction X of the cylindrical battery 1, and the main body 201 and the bending portion 132 are not in contact.

[0078] The main body 201 may be disposed on a side of the bent portion 132 facing away from the bottom wall 12 . Along the axial direction X of the cylindrical battery 1 , the main body 201 may cover a portion of the bent portion 132 .

[0079] In some examples, a gap may be formed between the main body 201 and the bent portion 132 , so that the main body 201 and the bent portion 132 are separated by the gap.

[0080] In other examples, an insulating member may be provided between the main body 201 and the bent portion 132 to separate the main body 201 from the bent portion 132. The main body 201 and the insulating member may or may not be in contact; the bent portion 132 and the insulating member may or may not be in contact.

[0081] It can be understood that when the busbar 2 connects the end caps 30 of two cylindrical batteries 1 , in the axial direction X of the cylindrical battery 1 , the main body 201 and the bent portions 132 of the two cylindrical batteries 1 are spaced apart.

[0082] The main body 201 and the bending portion 132 of a cylindrical battery 1 are arranged at intervals, which can reduce the possibility of overlapping between the shell 10 of a cylindrical battery 1 and the bus 2, which is beneficial to reducing the short circuit risk of the battery module 100 and improving the safety performance of the battery module 100.

[0083] In some embodiments, a first recess 2011 is disposed on one side of the main body 201 facing the bending portion 132 , and a projection of the first recess 2011 along the axial direction X of the cylindrical battery 1 partially overlaps with a projection of the bending portion 132 along the axial direction X of the cylindrical battery 1 .

[0084] Along the axial direction X of the cylindrical battery 1 , the portion of the bending portion 132 covered by the main body 201 is arranged corresponding to the first recess 2011 , and the projection of the portion of the bending portion 132 covered by the main body 201 may be located in the projection of the first recess 2011 .

[0085] The first concave portion 2011 may be recessed in the surface of the first connection portion 202 and the second connection portion 203 facing the electrode assembly 20 in a direction away from the bent portion 132. The first concave portion 2011 may increase the distance between the main body portion 201 and the bent portion 132 along the axial direction X of the cylindrical battery 1, extend the creepage distance, and help further reduce the risk of short circuit.

[0086] In some embodiments, in the axial direction X of the cylindrical battery 1 , the main body 201 protrudes from the first surface 2021 of the first connecting portion 202 facing away from the end cover 30 .

[0087] Optionally, in the axial direction X of the cylindrical battery 1 , the main body 201 protrudes from the second connection portion 203 and faces away from the second surface 2031 of another cylindrical battery 1 .

[0088] In the axial direction X of the cylindrical battery 1 , the first connection portion 202 and the second connection portion 203 may be flush with each other or may be staggered with each other.

[0089] The main body 201 protrudes from the first surface 2021, which can increase the depth of the first recess 2011, further increase the spacing distance between the main body 201 and the bending portion 132, further extend the creepage distance, and help further reduce the risk of short circuit.

[0090] In some embodiments, the main body 201 includes a bus section 2012, a first bending section 2013, and a second bending section 2014. The first bending section 2013 connects the first connection portion 202 and the bus section 2012, and the second bending section 2014 connects the second connection portion 203 and the bus section 2012. The bus section 2012, the first bending section 2013, and the second bending section 2014 define a first recess 2011.

[0091] The confluence section 2012 is located on the side of the first recess 2011 away from the bending section 132 along the axial direction X of the cylindrical battery 1. The first bending section 2013 and the second bending section 2014 are located on opposite sides of the first recess 2011 along the radial direction of the cylindrical battery 1, respectively.

[0092] Along the axial direction X of the cylindrical battery 1, the bus segment 2012 and the bending portion 132 of a cylindrical battery 1 are arranged at intervals. The projection of the bus segment 2012 and the projection of the bending portion 132 partially overlap.

[0093] The first bending section 2013 and the second bending section 2014 are both bent relative to the bus section 2012 toward the bending portion 132. The first recess 2011 defined by the bus section 2012, the first bending section 2013 and the second bending section 2014 has a greater depth in the axial direction X of the cylindrical battery 1, which is beneficial to increase the distance between the bus section 2012 and the bending portion 132, extend the creepage distance, and reduce the risk of short circuit.

[0094] In some embodiments, the first bending section 2013 and the bus section 2012, as well as the first bending section 2013 and the first connecting portion 202 are smoothly connected to reduce the stress concentration phenomenon caused by the bus 2 on the end cover 30 of a cylindrical battery 1, which is beneficial to reducing the risk of deformation or damage of the end cover 30 of a cylindrical battery 1.

[0095] In some embodiments, the second bending section 2014 and the bus section 2012, as well as the second bending section 2014 and the second connecting portion 203 are smoothly connected to reduce the stress concentration phenomenon caused by the bus 2 on the end cover 30 or the bottom wall 12 of another cylindrical battery 1, which is beneficial to reducing the risk of deformation or damage of the end cover 30 or the bottom wall 12 of another cylindrical battery 1.

[0096] In some embodiments, in the axial direction X of the cylindrical battery 1 , the projection of the first bending segment 2013 is separated from the projection of the bending portion 132 of one cylindrical battery 1 , and the projection of the second bending segment 2014 is located within the projection of another cylindrical battery 1 .

[0097] The first bending section 2013 is located on the inner side of the bending portion 132 of a cylindrical battery 1 along the radial direction of the cylindrical battery 1. Optionally, along the radial direction of the cylindrical battery 1, the bending portion 132 of a cylindrical battery 1 and the first bending section 2013 are arranged at intervals. A portion of the first recess 2011 is located on the inner side of the bending portion 132 of a cylindrical battery 1 along the radial direction of the cylindrical battery 1.

[0098] In the axial direction X of the cylindrical battery 1 , the second bending section 2014 is arranged opposite to another cylindrical battery 1 , and the second bending section 2014 and a part of the first recess 2011 are both located outside the bending portion 132 of one cylindrical battery 1 along the radial direction of the cylindrical battery 1 .

[0099] On the axial direction X of the cylindrical battery 1, the first bending section 2013 and the second bending section 2014 do not overlap with the bending portion 132 of a cylindrical battery 1, and the bending portion 132 is only arranged corresponding to the first recess 2011 of the bus 2, which can increase the spacing distance between the bending portion 132 and the bus 2 as much as possible, which is beneficial to further extend the creepage distance and reduce the risk of short circuit.

[0100] In some embodiments, the battery module 100 further includes a first insulating member 4 , which is connected to the busbar 2 . At least a portion of the first insulating member 4 is accommodated in the first recess 2011 and is located between the main body 201 and the bent portion 132 .

[0101] The first insulating member 4 may be entirely accommodated in the first recess 2011 , or only a portion of the first insulating member 4 may be accommodated in the first recess 2011 , and the other portion of the first insulating member 4 may be outside the first recess 2011 .

[0102] At least part of the first insulating member 4 may be disposed on the surface of the bus section 2012 facing the first recess 2011. The surface of the bus section 2012 facing the first recess 2011 may include two parts, one part of which is opposite to the bending portion 132 along the axial direction X of the cylindrical battery 1, and the other part is staggered from the bending portion 132. The first insulating member 4 is at least disposed on the part of the surface opposite to the bending portion 132.

[0103] Optionally, at least part of the first insulating member 4 may be directly connected to the main body 201 and spaced apart from the bent portion 132 in the axial direction X of the cylindrical battery 1. A gap may be formed between at least part of the first insulating member 4 and the bent portion 132, or other insulating components may be provided.

[0104] The first insulating member 4 can be connected to the busbar 2 by bonding, injection molding, electroplating or other suitable methods.

[0105] In some examples, the first insulating member 4 may include a heat shrinkable film, which shrinks when heated and covers at least a portion of the wall surface of the first recess 2011 formed by the busbar 2 .

[0106] In other examples, the first insulating member 4 may include an insulating layer formed by injection molding, electroplating or other suitable methods, and at least a portion of the insulating layer is located on at least a portion of the wall surface of the first recess 2011 surrounded by the busbar 2 .

[0107] The first insulating member 4 can insulate and isolate the main body 201 and the bent portion 132 , thereby reducing the possibility of overlapping between the main body 201 and the bent portion 132 , which is beneficial to further reduce the risk of short circuit.

[0108] In some embodiments, the first insulating member 4 completely covers the first recess 2011 .

[0109] The first insulating member 4 may completely cover the wall surface of the main body 201 used to enclose the first recess 2011. The wall surface of the main body 201 used to enclose the first recess 2011 may include the surface of the bus section 2012 facing the first recess 2011, the surface of the first bending section 2013 facing the first recess 2011, and the surface of the second bending section 2014 facing the first recess 2011.

[0110] The first insulating member 4 completely covers the first recess 2011 , which can reduce the possibility of the main body 201 and the bent portion 132 being overlapped through other conductive structures, thereby further reducing the risk of short circuit.

[0111] In some embodiments, the first insulating member 4 wraps the main body 201 .

[0112] Optionally, the first insulating member 4 may include a tubular heat shrinkable film, which is sleeved on the outside of the main body 201 and wraps the main body 201 after shrinking due to heat.

[0113] The first insulating member 4 may only wrap the main body 201 , or may simultaneously wrap the main body 201 , a portion of the first connecting portion 202 , and / or a portion of the second connecting portion 203 .

[0114] The entire outer surface of the main body 201 is covered by the first insulating member 4. On the one hand, it can improve the connection stability between the first insulating member 4 and the main body 201 and reduce the risk of the first insulating member 4 falling off the bus 2. On the other hand, it can also increase the insulation area of ​​the first insulating member 4, which is conducive to further improving the insulation isolation effect.

[0115] In some embodiments, the first insulating member 4 includes a first insulating portion 401, a second insulating portion 402, and a third insulating portion 403, wherein the first insulating portion 401 and the second insulating portion 402 are respectively connected to two ends of the third insulating portion 403. The third insulating portion 403 wraps the main body 201; the first insulating portion 401 wraps the portion of the first connecting portion 202 close to the main body 201; and the second insulating portion 402 wraps the portion of the second connecting portion 203 close to the main body 201.

[0116] The shape of the third insulating portion 403 may match the shape of the main body 201. Optionally, the third insulating portion 403 may include a first insulator portion 4031, a second insulator portion 4032, and a third insulator portion 4033. The third insulator portion 4033 wraps the bus section 2012 of the main body 201 and matches the shape of the bus section 2012. Exemplarily, the bus section 2012 may extend straight along a direction perpendicular to the axial direction X, and the third insulator portion 4033 may be a straight tube. The first insulator portion 4031 wraps the first bending section 2013 of the main body 201 and matches the shape of the first bending section 2013. Exemplarily, the first insulator portion 4031 may be a bent tube. The second insulator portion 4032 wraps the second bending section 2014 of the main body 201 and matches the shape of the second bending section 2014. Exemplarily, the second insulator portion 4032 may be a bent tube.

[0117] The first insulating portion 401 may wrap a portion of the first connecting portion 202 directly connected to the main body 201 , and the second insulating portion 402 may wrap a portion of the second connecting portion 203 directly connected to the main body 201 .

[0118] In some embodiments, along the arrangement direction of the first insulating portion 401 and the third insulating portion 403, the length of the first connecting portion 202 wrapped by the first insulating portion 401 may account for 0.1-0.3 of the total length of the first connecting portion 202, thereby reducing the impact on the connection effect between the first connecting portion 202 and the end cover 30 of a cylindrical battery 1.

[0119] In some embodiments, along the arrangement direction of the second insulating portion 402 and the third insulating portion 403, the length of the second connecting portion 203 wrapped by the second insulating portion 402 may account for 0.1-0.3 of the total length of the second connecting portion 203, thereby reducing the impact on the connection effect between the second connecting portion 203 and the end cover 30 or the bottom wall 12 of another cylindrical battery 1.

[0120] The first insulating member 4 not only wraps the main body 201 , but also wraps the first connecting portion 202 and the second connecting portion 203 close to the main body 201 , thereby increasing the wrapping area of ​​the first insulating member 4 on the bus 2 , which is beneficial to improving the insulation effect of the first insulating member 4 .

[0121] In some embodiments, the cylindrical battery 1 further includes an insulating film 60, which is sleeved on the housing 10, and a portion of the insulating film 60 covers the bent portion 132 in the axial direction X of the cylindrical battery 1. This portion of the insulating film 60 of a cylindrical battery 1 is located between the bent portion 132 and the main body 201 in the axial direction X of the cylindrical battery 1.

[0122] A portion of the insulating film 60 is located on the side of the bent portion 132 facing away from the bottom wall 12 in the axial direction X of the cylindrical battery 1 , and is located on the side of the main body 201 facing the bent portion 132 .

[0123] A portion of the insulating film 60 may be in direct contact with the bent portion 132 , and another insulating component may be disposed between the portion of the insulating film 60 and the bent portion 132 .

[0124] Along the axial direction X of the cylindrical battery 1 , a portion of the insulating film 60 may be spaced apart from the main body 201 , a gap may be formed between a portion of the insulating film 60 and the main body 201 , and other insulating components may also be provided.

[0125] Optionally, the insulating film 60 may include a first portion 61 and a second portion 62. The first portion 61 is disposed on the radially outer side of the housing 10 along the cylindrical battery 1, and covers at least a portion of the side wall body 131. The second portion 62 is connected to the first portion 61, and in the axial direction X of the cylindrical battery 1, the second portion 62 is located between the bent portion 132 and the main body 201, and covers the bent portion 132. In other words, in the axial direction X of the cylindrical battery 1, the projection of the bent portion 132 is located within the projection of the second portion 62.

[0126] Optionally, the first portion 61 covers the entire side wall body 131, and the insulating film 60 further includes a third portion 63, which is connected to the first portion 61. In the axial direction X of the cylindrical battery 1, the third portion 63 is located on the side of the bottom wall 12 facing away from the electrode assembly 20, and covers a portion of the bottom wall 12. The portion of the bottom wall 12 not covered by the third portion 63 is convenient for connecting the busbar 2.

[0127] The insulating film 60 can at least shield the bent portion 132 , and insulate and isolate the bent portion 132 from the main body 201 , which is beneficial to reducing the short circuit risk of the cylindrical battery 1 .

[0128] In some embodiments, the insulating film 60 may be a heat shrinkable film. When the cylindrical battery 1 is heated, the insulating film 60 shrinks and adheres closely to the surface of the housing 10 to form a protective film that tightly covers the housing 10.

[0129] The insulating film 60 may include a polyolefin material, for example, the insulating film 60 may include polyethylene, polypropylene or other suitable materials.

[0130] In some embodiments, the cylindrical battery 1 further includes a second insulating member 70 . In the axial direction X of the cylindrical battery 1 , at least a portion of the second insulating member 70 is disposed between the bent portion 132 and the insulating film 60 .

[0131] The second insulating member 70 may be disposed entirely between the bending portion 132 and the insulating film 60 , or only a portion of the second insulating member 70 may be disposed between the bending portion 132 and the insulating film 60 , and another portion of the second insulating member 70 may extend beyond the bending portion 132 toward the direction close to the axis a of the cylindrical battery 1 .

[0132] The second insulating member 70 may be connected to the bending portion 132 by bonding, welding, hot pressing or other suitable methods, or the second insulating member 70 and the bending portion 132 may be connected by simply contacting each other.

[0133] Along the axial direction X of the cylindrical battery 1 , the insulating film 60 may cover at least a portion of the second insulating member 70 , so that the insulating film 60 may cover and restrict the second insulating member 70 , which is beneficial to improving the installation stability of the second insulating member 70 .

[0134] The second insulating member 70 and the insulating film 60 can play a dual insulating isolation effect. After the insulating film 60 is damaged due to corrosion, scratches or other reasons, the second insulating member 70 can still achieve insulation isolation between the bending portion 132 and the main body 201, which is conducive to further reducing the short circuit risk of the cylindrical battery 1.

[0135] In some embodiments, one cylindrical battery 1 and another cylindrical battery 1 are arranged along a first direction Y, and the first direction Y is perpendicular to the axial direction X of the cylindrical battery 1 . The second connecting portion 203 is connected to the bottom wall 12 of another cylindrical battery 1 .

[0136] Optionally, the arrangement directions of one cylindrical battery 1 and another cylindrical battery 1 are opposite. For example, the end cap 30 of one cylindrical battery 1 is located at one end of the cylindrical battery 1 in the axial direction, and the end cap 30 of another cylindrical battery 1 is located at the other end of the other cylindrical battery 1 in the axial direction. The end cap 30 of one cylindrical battery 1 and the bottom wall 12 of another cylindrical battery 1 are at the same end in the axial direction X.

[0137] The first connection portion 202 is connected to the end cover 30 of one cylindrical battery 1 , the second connection portion 203 is connected to the bottom wall 12 of another cylindrical battery 1 , and the busbar 2 connects one cylindrical battery 1 and another cylindrical battery 1 in series.

[0138] The first connection portion 202 , the main body portion 201 , and the second connection portion 203 of the busbar 2 may be arranged in sequence along the first direction Y.

[0139] In some embodiments, the battery module 100 further includes a bracket 3, the bracket 3 having a receiving cavity 301, and a plurality of cylindrical batteries 1 are disposed in the receiving cavity 301. The bracket 3 can exert a certain limiting effect on the cylindrical batteries 1 in the receiving cavity 301, which is beneficial to reduce the shaking or vibration of the cylindrical batteries 1 and improve the installation stability of the cylindrical batteries 1.

[0140] In some embodiments, there may be multiple accommodating cavities 301 , and multiple cylindrical batteries 1 are respectively disposed in the multiple accommodating cavities 301 .

[0141] The support 3 may include insulating material to insulate and isolate the cylindrical batteries 1 in different accommodating cavities 301 .

[0142] The plurality of accommodation cavities 301 may be arranged along the first direction Y.

[0143] In some examples, the cylindrical batteries 1 and the accommodating cavities 301 may be arranged in a one-to-one correspondence, and each accommodating cavity 301 may accommodate only one cylindrical battery 1 .

[0144] In other examples, the cylindrical batteries 1 and the accommodating cavities 301 may also be arranged in a multiple-to-one manner, and each accommodating cavity 301 may accommodate at least two cylindrical batteries 1 .

[0145] Optionally, the multiple accommodating cavities 301 may be isolated from each other and not connected to each other, so as to reduce the possibility of short-circuiting or other mutual influence between the cylindrical batteries 1 in adjacent accommodating cavities 301 .

[0146] Alternatively, a communication channel may be provided between two adjacent accommodating chambers 301 .

[0147] The plurality of cylindrical batteries 1 are respectively arranged in the plurality of accommodating cavities 301 , and a certain isolation effect can be generated between the cylindrical batteries 1 in adjacent accommodating cavities 301 , which is beneficial to reduce the risk of short circuit or other mutual influence between the cylindrical batteries 1 in adjacent accommodating cavities 301 .

[0148] In some embodiments, each accommodating cavity 301 is provided with openings 302 at both ends along the axial direction X of the cylindrical battery 1. The first connecting portion 202 is provided at one opening 302 and connected to the end cover 30 of one cylindrical battery 1, and the second connecting portion 203 is provided at another opening 302 and connected to the bottom wall 12 of another cylindrical battery 1.

[0149] The bracket 3 may include two end walls 303 disposed opposite to each other along the axial direction X of the cylindrical battery 1 and a peripheral wall 304 connected between the two end walls 303. The two end walls 303 and the peripheral wall 304 enclose a plurality of accommodating cavities 301. The opening 302 may penetrate the end wall 303 along the axial direction X of the cylindrical battery 1, and the accommodating cavity 301 is connected to the outside of the bracket 3 through the opening 302.

[0150] At least part of the end cover 30 and at least part of the bottom wall 12 of each cylindrical battery 1 can be exposed to the outside of the bracket 3 through two openings 302 at both ends of the accommodating cavity 301 , respectively, so as to facilitate connection with the busbar 2 .

[0151] The first connection part 202 and the bracket 3 are arranged at intervals on the wall of the opening 302, and the second connection part 203 and the bracket 3 are arranged at intervals on the wall of another opening 302, and a part of the main body 201 can be arranged in the opening 302, and another part of the main body 201 can be arranged outside the opening 302. In this way, the interference between the main body 201 and the bracket 3 can be reduced, which is conducive to improving the assembly efficiency.

[0152] The bracket 3 is provided with an opening 302, which not only facilitates the bracket 3 to axially limit the cylindrical battery 1, but also facilitates the bus 2 to be connected to the end cover 30 and the bottom wall 12 of the cylindrical battery 1. In addition, the first connecting portion 202 and the second connecting portion 203 are arranged in the opening 302, and can share at least part of the space in the axial direction X with the bracket 3, which is conducive to saving space and improving the compactness of the structure.

[0153] In some embodiments, the diameter of the accommodating cavity 301 may be equal to or slightly larger than the diameter of the cylindrical battery 1. The diameter of the opening 302 is smaller than the diameter of the cylindrical battery 1. Only a portion of the end cover 30 and a portion of the bottom wall 12 are exposed to the outside of the bracket 3 through the two openings 302 at both ends of the accommodating cavity 301. Along the axial direction X of the cylindrical battery 1, the two end walls 303 can limit and support the cylindrical battery 1.

[0154] In order to facilitate the cylindrical battery 1 to be loaded into the receiving cavity 301 , the bracket 3 may include a first bracket 3a and a second bracket 3b arranged in a direction parallel to the axial direction X. The first bracket 3a is connected to the second bracket 3b. The first bracket 3a and the second bracket 3b together enclose a plurality of receiving cavities 301 .

[0155] The first bracket 3a and the second bracket 3b are both cylindrical structures. The end of the first bracket 3a away from the second bracket 3b has one end wall 303, and the end of the second bracket 3b away from the first bracket 3a has the other end wall 303.

[0156] The first bracket 3 a has a first peripheral wall surrounding one of the end walls 303 , and the second bracket 3 b has a second peripheral wall surrounding the other end wall 303 . The peripheral wall 304 may include a first peripheral wall and a second peripheral wall.

[0157] During assembly, the plurality of cylindrical batteries 1 may be first installed in one of the first bracket 3 a and the second bracket 3 b , and then the first bracket 3 a and the second bracket 3 b may be connected to confine the plurality of cylindrical batteries 1 in the bracket 3 .

[0158] In some embodiments, along the axial direction X of the cylindrical battery 1, the first connection portion 202 and the second connection portion 203 do not extend beyond the outer end surface of the bracket 3 away from the accommodating cavity 301. The first connection portion 202 and the second connection portion 203 can be completely within the opening 302, and the first connection portion 202 and the second connection portion 203 do not occupy additional space in the axial direction X, which is conducive to further improving the structural compactness and the energy density of the battery module 100.

[0159] In some embodiments, the bracket 3 is provided with a second recess 305 on one side along the axial direction X of the cylindrical battery 1 , and the second recess 305 communicates with an opening 302 for accommodating the first connection part 202 and another opening 302 for accommodating the second connection part 203 . At least part of the main body 201 is accommodated in the second recess 305 .

[0160] In the axial direction X of the cylindrical battery 1, the second recess 305 may be recessed in the outer end surface 3031 of the bracket 3 in the direction facing the accommodating cavity 301. Optionally, the second recess 305 is formed on the end wall 303, and the outer end surface 3031 may be a side surface of the end wall 303 facing away from the accommodating cavity 301.

[0161] Along the direction of the bending portion 132 pointing to the main body 201, the main body 201 does not exceed the outer end surface 3031 of the bracket 3. The surface of the main body 201 facing away from the bending portion 132 can be flush with the outer end surface 3031, or the surface of the main body 201 facing away from the bending portion 132 can also be located on the side of the outer end surface 3031 facing the accommodating cavity 301.

[0162] The second recess 305 can provide at least a partial accommodation space for the main body 201 , and the main body 201 and the bracket 3 can share at least a partial space in the axial direction X, which is beneficial to saving space and improving the structural compactness and energy density of the battery module 100 .

[0163] In some embodiments, the second recess 305 is disposed on the other side of the bracket 3 along the axial direction X of the cylindrical battery 1 , and the second recesses 305 located on opposite sides of the bracket 3 along the axial direction X of the cylindrical battery 1 may be alternately disposed along the first direction Y.

[0164] In some embodiments, the main body 201 may be entirely accommodated in the second recess 305 , or only a portion of the main body 201 may be accommodated in the second recess 305 , and the other portion of the main body 201 may be accommodated in the opening 302 .

[0165] In some embodiments, along the direction of the bending portion 132 pointing to the main body 201, the third insulating portion 403 of the first insulating member 4 does not exceed the outer end surface 3031 of the bracket 3, and the first insulating member 4 and the bracket 3 can share the space on the axial direction X, which is beneficial to improving the structural compactness and energy density of the battery module 100.

[0166] In some embodiments, the bracket 3 includes a protrusion 306, and the protrusion 306 protrudes from the bottom surface 3051 of the second recess 305. The main body 201 includes a through hole 2015, and the protrusion 306 is disposed through the through hole 2015.

[0167] The protrusion 306 may extend from the bottom surface 3051 in a direction away from the accommodating cavity 201 .

[0168] The number of the protrusion 306 and the through hole 2015 can be one or more, and the protrusion 306 and the through hole 2015 correspond one to one.

[0169] The plug-in fit between the protrusion 306 and the through hole 2015 can limit the movement of the bus 2 relative to the bracket 3. The bracket 3 and the bus 2 can be pre-positioned by the plug-in fit between the protrusion 306 and the through hole 2015, which facilitates the assembly connection between the bus 2 and the cylindrical battery 1.

[0170] In some embodiments, in the axial direction X of the cylindrical battery 1 , a portion of the bracket 3 is located between the main body 201 and a bent portion 132 of the cylindrical battery 1 .

[0171] Optionally, at least a portion of the bracket 3 corresponding to the second recess 305 along the axial direction X of the cylindrical battery 1 is located between the main body 201 and a bent portion 132 of the cylindrical battery 1 .

[0172] Optionally, a portion of the end wall 303 of the bracket 3 is located between the main body 201 and the bent portion 132 of a cylindrical battery 1 .

[0173] Along the radial direction of the cylindrical battery 1 , a portion of the bracket 3 between the main body 201 and the bent portion 132 of a cylindrical battery 1 may extend beyond the bent portion 132 in a direction facing the axis a of the cylindrical battery 1 .

[0174] The portion of the bracket 3 located between the main body 201 and the bent portion 132 of a cylindrical battery 1 can insulate and isolate the main body 201 and the bent portion 132 of a cylindrical battery 1, which is beneficial to further reduce the risk of short circuit.

[0175] The first insulating member 4, the portion of the bracket 3 located between the main body 201 and the bent portion 132 of the cylindrical battery 1, the insulating film 60, and the second insulating member 70 can form a multi-layer insulating structure, which is beneficial to improving the insulation effect, thereby minimizing the risk of short circuit.

[0176] The present application also provides an electric device 1000, which includes the battery module 100 provided by any of the above embodiments. The battery module 100 can provide electric energy for the operation of the electric device 1000.

[0177] The electric device 1000 of the embodiment of the present application may be a portable device, a laptop computer, an electric toy, a drone, an electric tool, an energy storage system, etc. The electric tool includes a metal cutting electric tool, a cleaning tool, etc., for example, an electric drill, an electric wrench, a vacuum cleaner, a sweeping robot, etc. The embodiment of the present application does not impose any special restrictions on the above-mentioned electric devices.

[0178] Although the present application has been described with reference to preferred embodiments, various modifications may be made thereto and parts thereof may be replaced with equivalents without departing from the scope of the present application. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery module, characterized in that: It includes a plurality of cylindrical batteries and a plurality of busbars, wherein the busbars connect the cylindrical batteries; The cylindrical battery comprises a shell, an end cap and an electrode assembly, the shell comprises a bottom wall and a side wall connected to the bottom wall, the end cap is connected to the side wall and insulated from the side wall, the electrode assembly is accommodated in the shell, and the electrode assembly and the end cap are arranged along the axial direction of the cylindrical battery; The housing and the end cap have different polarities; One end of the side wall away from the bottom wall is bent toward the axis of the cylindrical battery to form a bent portion; The busbar includes a main body, a first connecting portion and a second connecting portion, wherein the first connecting portion is connected to the end cover of one cylindrical battery, and the second connecting portion is connected to the end cover or the bottom wall of another cylindrical battery; A first recessed portion is disposed on a side of the main body facing the bent portion, and a projection of the first recessed portion along the axial direction partially overlaps a projection of the bent portion along the axial direction.

2. The battery module according to claim 1, characterized in that: In the axial direction, the main body portion protrudes from a surface of the first connecting portion facing away from the end cover.

3. The battery module according to claim 1 or 2, characterized in that: The main body includes a converging section, a first bending section and a second bending section, the first bending section connects the first connecting section and the converging section, and the second bending section connects the second connecting section and the converging section; The converging section, the first bending section, and the second bending section define the first recessed portion.

4. The battery module according to claim 3, characterized in that: In the axial direction, the projection of the first bending section is separated from the projection of the bending portion of the one cylindrical battery, and the projection of the second bending section is located within the projection of the other cylindrical battery.

5. The battery module according to any one of claims 1 to 4, characterized in that: The battery module further includes a first insulating member connected to the bus bar; At least a portion of the first insulating member is accommodated in the first recess and is located between the main body and the bent portion.

6. The battery module according to claim 5, characterized in that: The first insulating member completely covers the first recess.

7. The battery module according to claim 5 or 6, characterized in that: The first insulating member wraps the main body.

8. The battery module according to claim 7, characterized in that: The first insulating member includes a first insulating portion, a second insulating portion and a third insulating portion, wherein the first insulating portion and the second insulating portion are respectively connected to two ends of the third insulating portion; The third insulating portion wraps the main body, the first insulating portion wraps a portion of the first connecting portion close to the main body, and the second insulating portion wraps a portion of the second connecting portion close to the main body.

9. The battery module according to any one of claims 1 to 8, characterized in that: The cylindrical battery further includes an insulating film, the insulating film is sleeved on the shell, and a part of the insulating film covers the bent portion in the axial direction; The portion of the insulating film of the one cylindrical battery is located between the bent portion and the main body portion in the axial direction.

10. The battery module according to claim 9, characterized in that: The cylindrical battery further includes a second insulating member. In the axial direction, at least a portion of the second insulating member is disposed between the bent portion and the insulating film.

11. The battery module according to any one of claims 1 to 10, characterized in that: The one cylindrical battery and the other cylindrical battery are arranged along a first direction, and the first direction is perpendicular to the axial direction; The second connecting portion is connected to the bottom wall of the other cylindrical battery.

12. The battery module according to any one of claims 1 to 11, characterized in that: The battery module further comprises a bracket having a receiving cavity, and the plurality of cylindrical batteries are arranged in the receiving cavity.

13. The battery module according to claim 12, characterized in that: Each of the accommodating cavities is provided with openings at both ends along the axial direction; The first connection portion is disposed at one of the openings and connected to the end cover of the one cylindrical battery, and the second connection portion is disposed at the other of the openings and connected to the bottom wall of the other cylindrical battery.

14. The battery module according to claim 13, characterized in that: The bracket is provided with a second recessed portion on one side along the axial direction, wherein the second recessed portion communicates with one opening for accommodating the first connecting portion and another opening for accommodating the second connecting portion; At least a portion of the main body is accommodated in the second recess.

15. The battery module according to claim 14, characterized in that: The bracket includes a protrusion, and the protrusion protrudes from the bottom surface of the second recess; The main body comprises a through hole, and the protrusion is penetrated through the through hole.

16. The battery module according to any one of claims 13 to 15, characterized in that: In the axial direction, a portion of the bracket is located between the main body and the bent portion of the one cylindrical battery.

17. The battery module according to any one of claims 1 to 16, characterized in that: The electrode assembly includes a first electrode terminal and a second electrode terminal with opposite polarities, wherein the first electrode terminal is connected to the shell, and the second electrode terminal is connected to the end cap.

18. An electrical equipment, characterized in that: Comprising a battery module according to any one of claims 1-17.

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