Battery module and electric device

Abstract

A battery module and an electric device. The battery module comprises a plurality of cylindrical batteries and a plurality of busbars connected to the cylindrical batteries, wherein each cylindrical battery comprises a case, an end cover and an electrode assembly; the case comprises a bottom wall and a side wall connected to the bottom wall, the electrode assembly is accommodated in the case, and the electrode assembly and the end cover are arranged in the axial direction of the cylindrical battery; the case and the end cover have different polarities; the end of the side wall away from the bottom wall is bent towards the axis of the cylindrical battery to form a bent portion; each busbar comprises a main body portion, a first connecting portion and a second connecting portion, the first connecting portion being connected to the end cover of one cylindrical battery, and the second connecting portion being connected to the end cover or the bottom wall of another cylindrical battery; and a first recess is formed on the side of the main body portion facing the bent portion, and the projection of the first recess in the axial direction partially overlaps with the projection of the bent portion in the axial direction.

Description

Battery module and electric device

[0001] The present application claims priority to the Chinese patent application No. 202411388953.X, filed on September 30, 2024, and entitled "Battery module and electric device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of battery, in particular to a battery module and an electric device. BACKGROUND

[0003] A rechargeable battery refers to a battery that can be activated by charging after discharging to continue to be used. Rechargeable batteries are widely used in electronic devices, such as mobile phones, laptops, drones, etc.

[0004] 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 the battery module has always been the research direction in the industry. SUMMARY

[0005] The present application provides a battery module and an electric device, which can improve the safety performance.

[0006] In a first aspect, the present application provides a battery module, which includes a plurality of cylindrical batteries and a plurality of busbars, the busbars being connected to the cylindrical batteries. The cylindrical battery includes a shell, an end cover and an electrode assembly, the shell including a bottom wall and a side wall connected to the bottom wall, the end cover being connected to the side wall and insulated from the side wall, the electrode assembly being accommodated in the shell, the electrode assembly and the end cover being arranged along an axial direction of the cylindrical battery; the shell and the end cover have different polarities; an end of the side wall away from the bottom wall is bent towards an axis of the cylindrical battery and forms a bent portion; the busbar includes a main body portion, a first connecting portion and a second connecting portion, the first connecting portion being connected to the end cover of one cylindrical battery, the second connecting portion being connected to the end cover or the bottom wall of another cylindrical battery; the main body portion is provided with a first recess on a side facing the bent portion, a projection of the first recess along the axial direction of the cylindrical battery partially overlaps a projection of the bent portion along the axial direction of the cylindrical battery.

[0007] The first recess can increase the distance between the main body portion and the bent portion along the axial direction of the cylindrical battery, extend the creepage distance, reduce the possibility of the shell of the cylindrical battery and the busbar being overlapped, and be conducive to reducing the short circuit risk of the battery module and improving the safety performance of the battery module.

[0008] In one or more optional embodiments above, the battery module further comprises a first insulating member connected to the busbar; at least a portion of the first insulating member is accommodated in the first recess and located between the main body portion and the bent portion. The first insulating member can insulate and separate the main body portion and the bent portion, reduce the possibility of the main body portion and the bent portion being overlapped, and help to further reduce the risk of short circuit.

[0009] In one or more optional embodiments above, the first insulating member completely covers the first recess. In this way, the possibility of the main body portion and the bent portion being overlapped by other conductive structures can be reduced, which helps to further reduce the risk of short circuit.

[0010] In one or more optional embodiments above, the first insulating member wraps the main body portion. The entire external surface of the main body portion is covered by the first insulating member, which on one hand can improve the connection stability between the first insulating member and the main body portion, reduce the risk of the first insulating member falling off the busbar, and on the other hand can also increase the insulation area of the first insulating member, which helps to further improve the insulation and separation effect.

[0011] In one or more optional embodiments above, the first insulating member comprises a first insulating portion, a second insulating portion and a third insulating portion, 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 portion, the first insulating portion wraps a portion of the first connecting portion close to the main body portion, and the second insulating portion wraps a portion of the second connecting portion close to the main body portion. In this way, the wrapping area of the first insulating member on the busbar is increased, which helps to improve the insulation effect of the first insulating member.

[0012] In one or more optional embodiments above, the battery module further comprises a support, the support has a receiving cavity, and the plurality of cylindrical batteries are arranged in the receiving cavity. The support can produce a certain limiting effect on the cylindrical batteries in the receiving cavity, which helps to reduce the shaking or vibration of the cylindrical batteries and improve the installation stability of the cylindrical batteries.

[0013] In one or more optional embodiments above, each receiving cavity is provided with an opening at both ends along the axial direction of the cylindrical battery; the first connecting portion is arranged in one opening and connected to the end cover of one cylindrical battery, and the second connecting portion is arranged in the other opening and connected to the bottom wall of the other cylindrical battery, so as to connect the two cylindrical batteries in series. By providing the openings, the support can not only axially limit the cylindrical batteries, but also facilitate the connection of the busbar to the end cover and the bottom wall of the cylindrical batteries. Moreover, the first connecting portion and the second connecting portion are arranged in the openings, which can share at least part of the space in the axial direction with the support, which helps to save space and improve the compactness of the structure.

[0014] In one or more optional embodiments above, each accommodating cavity is provided with an opening at each end in the axial direction of the cylindrical battery; the first connecting part is arranged at one opening and connected to the end cover of one cylindrical battery, and the second connecting part is arranged at the other opening and connected to the end cover of the other cylindrical battery, so as to connect the two cylindrical batteries in parallel. The bracket is provided with the opening, which is convenient for the bracket to axially limit the cylindrical battery and is also convenient for the busbar to be connected to the end cover of the cylindrical battery. Moreover, the first connecting part and the second connecting part are arranged in the opening and can share at least part of the space in the axial direction with the bracket, which is beneficial to save space and improve the compactness of the structure.

[0015] In one or more optional embodiments above, the bracket is provided with a second recess at one side in the axial direction of the cylindrical battery, the second recess is communicated with one opening accommodating the first connecting part and the other opening accommodating the second connecting part; and at least part of the main body part is accommodated in the second recess. The second recess can provide at least part of the accommodation space for the main body part, and the main body part and the bracket can share at least part of the space in the axial direction, which is beneficial to save space and improve the compactness of the structure and the energy density of the battery module.

[0016] In one or more optional embodiments above, the bracket includes a protrusion protruding from the bottom surface of the second recess; and the main body part includes a first through hole, and the protrusion is arranged in the first through hole. The plug-in cooperation of the protrusion and the first through hole can limit the movement of the busbar relative to the bracket, and the bracket and the busbar can be pre-positioned through the plug-in cooperation of the protrusion and the first through hole, which is convenient for the assembly and connection of the busbar and the cylindrical battery.

[0017] In one or more optional embodiments above, the first insulating part includes a second through hole, and the second through hole and the first through hole are through; and the protrusion is arranged in the first through hole and the second through hole at the same time. The plug-in cooperation of the protrusion and the first through hole and the second through hole at the same time can limit the movement of the first insulating part relative to the busbar, and the first insulating part and the busbar can be positioned through the plug-in cooperation of the protrusion and the first through hole and the second through hole, which reduces the risk of the first insulating part being separated from the busbar in a harsh environment and improves the safety and reliability of the cylindrical battery.

[0018] In one or more optional embodiments above, in the axial direction of the cylindrical battery, part of the bracket is located between the main body part and the bent part of one cylindrical battery. The part of the bracket located between the main body part and the bent part of one cylindrical battery can insulate and isolate the main body part and the bent part of one cylindrical battery, which is beneficial to further reduce the risk of short circuit.

[0019] In one or more optional embodiments above, the bracket includes two end walls arranged opposite along the axial direction of the cylindrical battery and a peripheral wall connected between the two end walls, and the two end walls and the peripheral wall enclose a receiving cavity. At least part of one end wall of the bracket is located between the main body portion and the bent portion of one cylindrical battery, and the second recess is located in the end wall. The part of the end wall corresponding to the second recess is thinner, providing at least part of the receiving space for the main body portion. The part of the end wall not corresponding to the second recess is thicker, which is conducive to enhancing the strength of the bracket and improving the stability of the cylindrical battery in the bracket.

[0020] In one or more optional embodiments above, the electrode assembly includes a first electrode end and a second electrode end with opposite polarities, the first electrode end is connected to the shell, and the second electrode end is connected to the end cover.

[0021] In one or more optional embodiments above, in the axial direction of the cylindrical battery, the main body portion protrudes from the surface of the first connecting portion away from the end cover. In this way, the depth of the first recess can be increased, the spacing distance between the main body portion 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.

[0022] In one or more optional embodiments above, the main body portion includes a converging section, a first bent section, and a second bent section, the first bent section connects the first connecting portion and the converging section, and the second bent section connects the second connecting portion and the converging section; the converging section, the first bent section, and the second bent section define the first recess. The first recess has a large depth in the axial direction of the cylindrical battery, which is conducive to increasing the spacing distance between the converging section and the bent portion, extending the creepage distance, and reducing the risk of short circuit.

[0023] In one or more optional embodiments above, in the axial direction of the cylindrical battery, the projection of the first bent section is separated from the projection of the bent portion of one cylindrical battery, and the projection of the second bent section is located within the projection of the other cylindrical battery. In the axial direction of the cylindrical battery, neither the first bent section nor the second bent section overlaps the bent portion of one cylindrical battery, and the bent portion is arranged corresponding to the first recess of the busbar only, which can maximize the spacing distance between the bent portion and the busbar, and is conducive to further extending the creepage distance and reducing the risk of short circuit.

[0024] In one or more optional embodiments above, 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 of the cylindrical battery; the part of the insulating film of one cylindrical battery is located between the bent portion and the main body portion 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 portion, and is conducive to reducing the risk of short circuit of the cylindrical battery.

[0025] In one or more optional embodiments above, the cylindrical battery further comprises a second insulating member, at least a portion of the second insulating member is arranged between the bending portion and the insulating film in the axial direction of the cylindrical battery. The insulating film can cover at least a portion of the second insulating member in the axial direction of the cylindrical battery, so as to have a wrapping and limiting effect on the second insulating member through the insulating film, thereby facilitating to improve the installation stability of the second insulating member. The second insulating member and the insulating film can have a double insulation and isolation effect. After the insulating film is damaged due to corrosion, scratching or other reasons, the insulation and isolation between the bending portion and the main body portion can still be realized through the second insulating member, thereby facilitating to further reduce the short circuit risk of the cylindrical battery.

[0026] In one or more optional embodiments above, the cylindrical battery and the other 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. In a second aspect, the present application provides a battery module, which comprises the battery module of any one of the embodiments of the first aspect. BRIEF DESCRIPTION OF DRAWINGS

[0027] The accompanying drawings, which are included to provide a further understanding of the present application and are incorporated in and constitute a part of this application, illustrate embodiments of the present application and serve to explain the present application. Features of the present application, both as to organization and method of operation, together with an understanding of the same, can be best understood by reference to the following detailed description, when considered in connection with the accompanying drawings, wherein:

[0028] FIG. 1 is a structural schematic diagram of a battery module provided by some embodiments of the present application;

[0029] FIG. 2 is an exploded structural schematic diagram of the battery module shown in FIG. 1;

[0030] FIG. 3 is a cross-sectional schematic diagram of a cylindrical battery of the battery module shown in FIG. 1;

[0031] FIG. 4 is a cross-sectional schematic diagram of the battery module shown in FIG. 1;

[0032] FIG. 5 is a partial structural schematic diagram of the battery module shown in FIG. 4;

[0033] FIG. 6 is an enlarged structural schematic diagram of region A in FIG. 4;

[0034] FIG. 7 is a structural schematic diagram of a busbar and an insulating member of the battery module shown in FIG. 1;

[0035] FIG. 8 is an exploded structural schematic diagram of FIG. 7;

[0036] FIG. 9 is a structural schematic diagram of the busbar and the insulating member of the battery module shown in FIG. 1;

[0037] FIG. 10 is a cross-sectional schematic diagram of the busbar and the insulating member of the battery module shown in FIG. 1;

[0038] FIG. 11 is an enlarged structural schematic diagram of region B in FIG. 10;

[0039] FIG. 12 is a structural schematic diagram of an electrical device according to some embodiments of the present application.

[0040] The reference signs of the detailed description are as follows: cylindrical battery 1, shell 10, shell opening 11, bottom wall 12, side wall 13, side wall main body 131, bending part 132, electrode assembly 20, first electrode end 21, second electrode end 22, end cover 30, explosion-proof sheet 40, insulating film 60, first part 61, second part 62, third part 63, second insulating part 70, insulating gasket 80; busbar 2, main body part 201, first recess part 2011, busbar section 2012, first bending section 2013, second bending section 2014, first through hole 2015, first connecting part 202, first surface 2021, second connecting part 203, second surface 2031, first protrusion part 204, second protrusion part 205; 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 part 305, protrusion 306, bottom surface 3051; first insulating part 4, first insulating part 401, second insulating part 402, third insulating part 403, first insulator part 4031, second insulator part 4032, third insulator part 4033, second through hole 4034; battery module 100; electrical device 1000; axis a, axial direction X, first direction Y. Detailed description

[0041] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application.

[0042] The terms “first”, “second”, “third”, and the like in the specification and claims of the present application or in the above drawings are used to distinguish different objects, and are not used to describe a specific order or primary and secondary relationship. In the embodiments of the present application, the same reference signs represent the same components, and for brevity, detailed description of the same components is omitted in different embodiments.

[0043] In the present application, “embodiment” means that the specific features, structures or characteristics described in conjunction with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily all refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments.

[0044] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection" and the like should be understood in a broad sense, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In the embodiments of the present application, "parallel" not only includes the case of absolute parallel, but also includes the case of approximately parallel which is generally recognized in engineering; at the same time, "perpendicular" not only includes the case of absolute perpendicular, but also includes the case of approximately perpendicular which is generally recognized in engineering. Illustratively, the included angle between two directions is 85°-95°, which can be considered as perpendicular; the included angle between two directions is 0°-10°, which can be considered as parallel.

[0046] The battery module and the electric equipment of the present application will be described below in conjunction with the accompanying drawings.

[0047] FIG. 1 is a structural schematic diagram of a battery module provided by some embodiments of the present application. As shown in FIG. 1, the embodiments of the present application provide a battery module 100, which includes a plurality of cylindrical batteries 1 and a plurality of busbars 2. The plurality of cylindrical batteries 1 can be connected in series, in parallel or in mixed connection through the plurality of busbars 2. The mixed connection means that there are both series connection and parallel connection among the plurality of cylindrical batteries 1.

[0048] In some embodiments, the cylindrical battery 1 can be a lithium ion battery, a sodium lithium ion battery, a sodium ion battery, a magnesium ion battery or other types of batteries.

[0049] Illustratively, the cylindrical battery 1 can be a 18650 battery, a 21700 battery, a 46800 battery, a 49480 battery or other types of cylindrical batteries.

[0050] In some embodiments, the cylindrical battery 1 is a secondary battery. The secondary battery can be activated by charging after discharging to continue to be used.

[0051] FIG. 2 is an exploded structural schematic diagram of the battery module shown in FIG. 1, FIG. 3 is a cross-sectional schematic diagram of a cylindrical battery of the battery module shown in FIG. 1, FIG. 4 is a cross-sectional schematic diagram of the battery module shown in FIG. 1, and FIG. 5 is a partial structural schematic diagram of the battery module shown in FIG. 4. As shown in FIGS. 2, 3, 4, and 5, in some embodiments, the cylindrical battery 1 includes a shell 10. The shell 10 includes a bottom wall 12 and a side wall 13 connected to the bottom wall 12. The bottom wall 12 can be disposed at one end of the cylindrical battery 1 in an axial direction X of the cylindrical battery 1, and the other end of the cylindrical battery 1 in the axial direction X of the cylindrical battery 1 can be provided with a shell opening 11, and the bottom wall 12 is disposed opposite the shell opening 11 along the axial direction X of the cylindrical battery 1. The side wall 13 can surround and be connected to the bottom wall 12, and the side wall 13 and the bottom wall 12 enclose a cylindrical space that is open to the outside through the shell opening 11.

[0052] The bottom wall 12 and the side wall 13 can be an integrally formed structure, or can be connected by welding, riveting, or other suitable means. In some embodiments, the cylindrical battery 1 further includes an electrode assembly 20 accommodated in the shell 10.

[0053] In some embodiments, the electrode assembly 20 includes first and second polar plates of opposite polarity. During charging and discharging of the cylindrical battery 1, active ions (e.g., lithium ions) are inserted into and extracted from between the first and second polar plates. One of the first and second polar plates is a positive polar plate, and the other is a negative polar plate.

[0054] In some embodiments, the electrode assembly 20 includes a separator disposed between the first and second polar plates, and the separator insulates the first and second polar plates. The provision of the separator is conducive to reducing the risk of short circuiting of the positive and negative polar plates, while allowing the active ions to pass through.

[0055] In some embodiments, the first polar plate includes a first polar plate body and a first electrode terminal 21, and the second polar plate includes a second polar plate body and a second electrode terminal 22. The first polar plate body includes a first current collector and a first active material layer coated on a surface of the first current collector, and the first electrode terminal 21 is connected to the first current collector. The second polar plate body includes a second current collector and a second active material layer coated on a surface of the second current collector, and the second electrode terminal 22 is connected to the second current collector. The first and second electrode terminals 21 and 22 are of opposite polarity, and one of the first and second electrode terminals 21 and 22 can be a positive electrode tab, and the other can be a negative electrode tab.

[0056] In some embodiments, the cylindrical battery 1 further includes an end cover 30 connected to and insulated from the side wall 13.

[0057] The end cover 30 and the bottom wall 12 can be arranged in the axial direction X of the cylindrical battery 1, and the end cover 30 can cover and seal the housing opening 11, so as to form a relatively closed containing space between the housing 10 and the end cover 30. The housing 10 and the end cover 30 can encapsulate the electrode assembly 20 and other components such as electrolyte.

[0058] Exemplarily, the end cover 30 and the side wall 13 can be insulated and separated by the insulating gasket 80.

[0059] In some embodiments, the materials of the housing 10 and the end cover 30 can be steel, aluminum, composite metal or other conductive materials. The materials of the housing 10 and the end cover 30 can be the same or different.

[0060] In some embodiments, the electrode assembly 20 and the end cover 30 are arranged in the axial direction X of the cylindrical battery 1. In the axial direction X of the cylindrical battery 1, the electrode assembly 20 can be arranged between the end cover 30 and the bottom wall 12.

[0061] In some embodiments, the housing 10 and the end cover 30 have different polarities. Exemplarily, one of the housing 10 and the end cover 30 is positive, and the other is negative. In some embodiments, the electrode assembly 20 includes a first electrode end 21 and a second electrode end 22 with opposite polarities. The first electrode end 21 is connected to the housing 10, and the second electrode end 22 is connected to the end cover 30. The housing 10 and the end cover 30 form two electrode terminals of the cylindrical battery 1 respectively, thereby eliminating the traditional electrode terminals and facilitating the simplification of the structure of the cylindrical battery 1.

[0062] Optionally, the first electrode end 21 can be in direct contact and connected with the bottom wall 12.

[0063] In some embodiments, the end of the side wall 13 away from the bottom wall 12 is bent towards the axis a of the cylindrical battery 1 and forms a bent portion 132.

[0064] The bent portion 132 can enclose the housing opening 11, and in the axial direction X of the cylindrical battery 1, the bent portion 132 is arranged opposite to the bottom wall 12.

[0065] In some embodiments, the cylindrical battery 1 further includes a rupture disc 40 arranged on the end cover 30. When the internal pressure of the cylindrical battery 1 exceeds the upper limit that the rupture disc 40 can withstand, the internal pressure of the cylindrical battery 1 can cause the rupture disc 40 to flip and burst away from the electrode assembly 20, thereby achieving the purpose of power-off and pressure relief, and facilitating the reduction of the risk of explosion of the cylindrical battery 1 due to excessive internal pressure and the improvement of the safety performance of the cylindrical battery 1.

[0066] In some embodiments, the side wall 13 further comprises a side wall body 131 which surrounds and is connected to the bottom wall 12, and the side wall body 131 is directly connected to the bottom wall 12 at one end close to the bottom wall 12 along the axial direction X. A bending portion 132 extends from the other end of the side wall body 131 away from the bottom wall 12 and bends towards the axis a of the cylindrical battery 1.

[0067] In some embodiments, in the axial direction X of the cylindrical battery 1, the part of the bending portion 132 is located on the side of the end cover 30 away from the bottom wall 12.

[0068] In some embodiments, in the axial direction X of the cylindrical battery 1, a part of the end cover 30 is located between the part of the bending portion 132 and the electrode assembly 20, and the bending portion 132 can generate a certain restriction to the end cover 30 in the arrangement direction of the end cover 30 and the electrode assembly 20, which is conducive to improving the structural stability of the end cover 30.

[0069] As shown in FIG. 1 and FIG. 2, in some embodiments, the battery module 100 further comprises a plurality of busbars 2 connected to the cylindrical batteries 1. The cylindrical batteries 1 can be connected in series or in parallel through the busbars 2.

[0070] In some embodiments, the busbar 2 can comprise a main body portion 201, a first connecting portion 202 and a second connecting portion 203. The first connecting portion 202 is connected to the end cover 30 of one cylindrical battery 1, and the second connecting portion 203 is connected to the end cover 30 or the bottom wall 12 of another cylindrical battery 1.

[0071] In some examples, as shown in FIG. 2, the arrangement directions of two adjacent cylindrical batteries 1 are opposite. In the axial direction X of the cylindrical battery 1, the end covers 30 of the two adjacent cylindrical batteries 1 are respectively located on the opposite sides, and the first connecting portion 202 and the second connecting portion 203 of the busbar 2 are respectively connected to the end cover 30 of one cylindrical battery 1 and the bottom wall 12 of another cylindrical battery 1, so as to connect the two cylindrical batteries 1 in series.

[0072] In some embodiments, as shown in FIG. 1 and FIG. 2, the battery module 100 of this example comprises five cylindrical batteries 1. From left to right, the first two cylindrical batteries 1 are connected in series through one busbar 2 at the bottom, the second cylindrical battery 1 and the third cylindrical battery 1 are connected in series through one busbar 2 at the top, the third cylindrical battery 1 and the fourth cylindrical battery 1 are connected in series through one busbar 2 at the bottom, and the fourth cylindrical battery 1 and the fifth cylindrical battery 1 are connected in series through one busbar 2 at the top.

[0073] In other examples, the two adjacent cylindrical batteries 1 are arranged in the same direction (not shown). In the axial direction X of the cylindrical battery 1, the end covers 30 of the two adjacent cylindrical batteries 1 are located on the same side, and the first connecting portion 202 and the second connecting portion 203 of the busbar 2 are connected to the end covers 30 of the two adjacent cylindrical batteries 1 respectively, so as to connect the two adjacent cylindrical batteries 1 in parallel. In some examples, the two adjacent cylindrical batteries 1 are connected by the busbar 2 at the top two end covers 30, and the two adjacent cylindrical batteries 1 are connected by another busbar 2 at the bottom two bottom walls 12.

[0074] As shown in FIG. 2, the first connecting portion 202 and the second connecting portion 203 of the busbar 2 can be connected by the main body portion 201. The main body portion 201 can be located between the first connecting portion 202 and the second connecting portion 203.

[0075] The main body portion 201, the first connecting portion 202 and the second connecting portion 203 can be an integrally formed structure. The main body portion 201 and the first connecting portion 202, and the main body portion 201 and the second connecting portion 203 can also be connected by welding, riveting or other suitable means.

[0076] As shown in FIGS. 1, 2 and 3, in some embodiments, in the axial direction X of the cylindrical battery 1, the main body portion 201 of the busbar 2 is arranged spaced apart from the bent portion 132 of the cylindrical battery 1. In other words, the main body portion 201 and the bent portion 132 are arranged along the axial direction X of the cylindrical battery 1, and the main body portion 201 and the bent portion 132 do not contact.

[0077] FIG. 6 is an enlarged structural schematic view of the area A in FIG. 4, and FIG. 6 shows the specific connection structure of the second cylindrical battery 1 and the bottom busbar 2. As shown in FIG. 6, the main body portion 201 can be arranged on the side of the bent portion 132 away from the bottom wall 12, and the main body portion 201 can cover a part of the bent portion 132 along the axial direction X of the cylindrical battery 1.

[0078] In some examples, a gap can be formed between the main body portion 201 and the bent portion 132, so as to space apart the main body portion 201 and the bent portion 132 through the gap.

[0079] In other examples, an insulating member can also be arranged between the main body portion 201 and the bent portion 132, so as to space apart the main body portion 201 and the bent portion 132 through the insulating member. The main body portion 201 and the insulating member can contact or not contact, and the bent portion 132 and the insulating member can contact or not contact.

[0080] It can be understood that when the busbar 2 connects the end covers 30 of the two cylindrical batteries 1, in the axial direction X of the cylindrical battery 1, the main body portion 201 is arranged spaced apart from the bent portions 132 of the two cylindrical batteries 1.

[0081] The body part 201 is arranged apart from the bending part 132 of the cylindrical battery 1, which can reduce the possibility of the shell 10 of the cylindrical battery 1 being overlapped with the busbar 2, and is conducive to reducing the short circuit risk of the battery module 100 and improving the safety performance of the battery module 100.

[0082] As shown in FIG. 6, in some embodiments, the side of the body part 201 of the busbar 2 facing the bending part 132 is provided with a first recess 2011, and the projection of the first recess 2011 along the axial direction X of the cylindrical battery 1 partially overlaps the projection of the bending part 132 along the axial direction X of the cylindrical battery 1.

[0083] Along the axial direction X of the cylindrical battery 1, the part of the bending part 132 covered by the body part 201 is arranged corresponding to the first recess 2011, and the projection of the part of the bending part 132 covered by the body part 201 can be located in the projection of the first recess 2011.

[0084] FIG. 7 is a structural schematic view of the busbar and the insulating part of the battery module shown in FIG. 1, FIG. 8 is an exploded structural schematic view of FIG. 7, and FIG. 9 is a structural schematic view of the busbar and the insulating part of the battery module shown in FIG. 1, as shown in FIGS. 6, 7, 8 and 9, the first recess 2011 can be recessed in the surface of the first connecting part 202 and the second connecting part 203 facing the electrode assembly 20 in the direction away from the bending part 132. The first recess 2011 can increase the distance between the body part 201 and the bending part 132 along the axial direction X of the cylindrical battery 1, and prolong the creepage distance, which is conducive to further reducing the short circuit risk.

[0085] In some embodiments, along the axial direction X of the cylindrical battery 1, the body part 201 protrudes from the first connecting part 202 away from the first surface 2021 of the end cover 30 of the cylindrical battery 1.

[0086] Optionally, along the axial direction X of the cylindrical battery 1, the body part 201 protrudes from the second connecting part 203 away from the second surface 2031 of the other cylindrical battery 1.

[0087] Along the axial direction X of the cylindrical battery 1, the first connecting part 202 and the second connecting part 203 can be flush with each other or staggered with each other.

[0088] The protrusion of the body part 201 from the first surface 2021 can increase the recess depth of the first recess 2011, further increase the interval distance between the body part 201 and the bending part 132, further prolong the creepage distance, and be conducive to further reducing the short circuit risk.

[0089] In some embodiments, the main body 201 comprises a converging section 2012, a first bending section 2013 connecting the first connecting section 202 and the converging section 2012, and a second bending section 2014 connecting the second connecting section 203 and the converging section 2012. The converging section 2012, the first bending section 2013, and the second bending section 2014 define a first recess 2011.

[0090] As shown in FIGS. 4, 6, 7, 8, and 9, the converging section 2012 is located on a side of the first recess 2011 facing away from the bending section 132 in the axial direction X of the cylindrical battery 1. The first bending section 2013 and the second bending section 2014 are respectively located on two sides of the first recess 2011 opposite in the radial direction of the cylindrical battery 1.

[0091] In the axial direction X of the cylindrical battery 1, the converging section 2012 is spaced apart from the bending section 132 of one of the cylindrical batteries 1. The projection of the converging section 2012 and the projection of the bending section 132 of one of the cylindrical batteries 1 partially overlap.

[0092] The first bending section 2013 and the second bending section 2014 are both bent relative to the converging section 2012 towards the bending section 132. The converging section 2012, the first bending section 2013, and the second bending section 2014 define the first recess 2011 having a large depth in the axial direction X of the cylindrical battery 1, which is conducive to increasing the distance between the converging section 2012 and the bending section 132, prolonging the creepage distance, and reducing the risk of short circuit.

[0093] In some embodiments, the first bending section 2013 and the converging section 2012, and the first bending section 2013 and the first connecting section 202 are smoothly connected, so as to reduce the stress concentration phenomenon caused by the busbar 2 to the end cover 30 of one of the cylindrical batteries 1, and facilitate reducing the risk of deformation or damage of the end cover 30 of one of the cylindrical batteries 1.

[0094] In some embodiments, the second bending section 2014 and the converging section 2012, and the second bending section 2014 and the second connecting section 203 are smoothly connected, so as to reduce the stress concentration phenomenon caused by the busbar 2 to the end cover 30 or the bottom wall 12 of the other one of the cylindrical batteries 1, and facilitate reducing the risk of deformation or damage of the end cover 30 or the bottom wall 12 of the other one of the cylindrical batteries 1.

[0095] In some embodiments, in the axial direction X of the cylindrical battery 1, the projection of the first bending section 2013 is spaced apart from the projection of the bending section 132 of one of the cylindrical batteries 1, and the projection of the second bending section 2014 is located within the projection of the other one of the cylindrical batteries 1.

[0096] The first bending section 2013 is located on the inner side of the bending portion 132 of one cylindrical battery 1 along the radial direction of the cylindrical battery 1. Alternatively, the bending portion 132 of one cylindrical battery 1 and the first bending section 2013 are arranged at intervals along the radial direction of the cylindrical battery 1. A part of the first recess 2011 is located on the inner side of the bending portion 132 of one cylindrical battery 1 along the radial direction of the cylindrical battery 1.

[0097] The second bending section 2014 is arranged opposite to another cylindrical battery 1 along the axial direction X of the cylindrical battery 1, and both the second bending section 2014 and the part of the first recess 2011 are located on the outer side of the bending portion 132 of one cylindrical battery 1 along the radial direction of the cylindrical battery 1.

[0098] The projection of the first bending section 2013 and the projection of the second bending section 2014 do not overlap with the projection of the bending portion 132 of one cylindrical battery 1 along the axial direction X of the cylindrical battery 1. The bending portion 132 is arranged corresponding to the first recess 2011 of the busbar 2 only, so as to increase the interval distance between the bending portion 132 and the first bending section 2013 and the second bending section 2014 as much as possible, which is beneficial to further prolong the creepage distance and reduce the risk of short circuit.

[0099] FIG. 10 is a cross-sectional view of the busbar and the insulating member of the battery module shown in FIG. 1, and FIG. 11 is an enlarged structural schematic view of region B in FIG. 10. As shown in FIGS. 6, 7, 8, 10 and 11, in some embodiments, the battery module 100 further comprises a first insulating member 4 connected to the busbar 2. At least a part of the first insulating member 4 is accommodated in the first recess 2011 and located between the main body portion 201 and the bending portion 132.

[0100] In some embodiments, along the axial direction X of the cylindrical battery 1, the thickness of the first insulating member 4 is d, and 10 μm≤d≤200 μm. For example, d can be: 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, or a value between any two of them.

[0101] In some embodiments, along the axial direction X of the cylindrical battery 1, the depth of the first recess is h, and 500 μm≤h≤1000 μm. For example, h can be: 500 μm, 600 μm, 700 μm, 800 μm, 900 μm, 1000 μm, or a value between any two of them.

[0102] The first insulating member 4 can be entirely accommodated in the first recess 2011, or only a portion of the first insulating member 4 can be accommodated in the first recess 2011, and another portion of the first insulating member 4 can be outside the first recess 2011.

[0103] At least a portion of the first insulating member 4 can be arranged on a surface of the confluence section 2012 facing the first recess 2011. The surface of the confluence section 2012 facing the first recess 2011 can include two portions, one of which is opposite the bent portion 132 along the axial direction X of the cylindrical battery 1, and the other of which is offset from the bent portion 132, and the first insulating member 4 is arranged at least on the portion of the surface opposite the bent portion 132.

[0104] Alternatively, at least a portion of the first insulating member 4 can be directly connected to the main body portion 201 and arranged in the axial direction X of the cylindrical battery 1 in a manner spaced apart from the bent portion 132. A gap can be formed between at least a portion of the first insulating member 4 and the bent portion 132, or other insulating members can be provided.

[0105] The first insulating member 4 can be connected to the busbar 2 by adhesion, injection molding, electroplating, or other suitable methods.

[0106] In some examples, the first insulating member 4 is connected to the busbar 2 by adhesion, and the material of the first insulating member 4 can include at least one of epoxy, silicone, acrylic, polyurethane, SIS hot melt adhesive, Kapton, or Mylar.

[0107] In some examples, the first insulating member 4 is connected to the busbar 2 by injection molding, and the material of the first insulating member 4 can include at least one of polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), ABS (acrylonitrile-butadiene-styrene), nylon (polyamide, PA), polycarbonate (PC), polyether ether ketone (PEEK), phenolic resin, epoxy resin, or polyester resin.

[0108] In some examples, the first insulating member 4 is connected to the busbar 2 by electroplating, and the material of the first insulating member 4 can include at least one of zirconium oxide (ZrO2), titanium oxide (TiO2), or silicon oxide (SiO2).

[0109] In some examples, the first insulating member 4 can include a heat-shrinkable film that shrinks after being heated and at least covers a portion of the wall surface of the busbar 2 surrounding the first recess 2011. The material of the first insulating member 4 can include at least one of polyethylene (PE), polyvinyl chloride (PVC), polyolefin (PO), or polyester (PET).

[0110] In some examples, the first insulating member 4 can include an insulating layer formed by injection molding, plating or other suitable means, at least part of the insulating layer being located on at least part of the wall of the first recess 2011 formed by the busbar 2.

[0111] The first insulating member 4 can insulate and isolate the main body part 201 and the bent part 132, reduce the possibility of the main body part 201 and the bent part 132 being overlapped, and be conducive to further reducing the risk of short circuit.

[0112] In some examples, the first insulating member 4 completely covers the first recess 2011.

[0113] The first insulating member 4 can completely cover the wall of the main body part 201 for forming the first recess 2011. The wall of the main body part 201 for forming the first recess 2011 can include a surface of the busbar segment 2012 facing the first recess 2011, a surface of the first bent segment 2013 facing the first recess 2011, and a surface of the second bent segment 2014 facing the first recess 2011.

[0114] The first insulating member 4 completely covers the first recess 2011, which can reduce the possibility of the main body part 201 and the bent part 132 being overlapped by other conductive structures, and be conducive to further reducing the risk of short circuit.

[0115] In some examples, the first insulating member 4 wraps the main body part 201.

[0116] Optionally, the first insulating member 4 can include a tubular heat-shrinkable film, the heat-shrinkable film being sleeved on the outside of the main body part 201 and wrapping the main body part 201 after being shrunk by heat.

[0117] The first insulating member 4 can wrap only the main body part 201, or can wrap the main body part 201, and part of the first connecting part 202 and / or part of the second connecting part 203.

[0118] The entire outer surface of the main body part 201 is covered by the first insulating member 4, which can improve the connection stability between the first insulating member 4 and the main body part 201, reduce the risk of the first insulating member 4 falling off the busbar 2, and increase the insulation area of the first insulating member 4, which is conducive to further improving the insulation and isolation effect.

[0119] In some examples, the first insulating member 4 includes a first insulating part 401, a second insulating part 402 and a third insulating part 403, the first insulating part 401 and the second insulating part 402 being respectively connected to two ends of the third insulating part 403. The third insulating part 403 wraps the main body part 201; the first insulating part 401 wraps part of the first connecting part 202 close to the main body part 201; and the second insulating part 402 wraps part of the second connecting part 203 close to the main body part 201.

[0120] The third insulation part 403 can have a shape matching that of the main body part 201. Alternatively, the third insulation part 403 can include a first insulation sub-part 4031, a second insulation sub-part 4032, and a third insulation sub-part 4033. The third insulation sub-part 4033 wraps around the confluence section 2012 of the main body part 201 and matches the shape of the confluence section 2012. Exemplarily, the confluence section 2012 can extend straight along a direction perpendicular to the axial direction X, and the third insulation sub-part 4033 can be a straight tube. The first insulation sub-part 4031 wraps around the first bending section 2013 of the main body part 201 and matches the shape of the first bending section 2013. Exemplarily, the first insulation sub-part 4031 can be a bent tube. The second insulation sub-part 4032 wraps around the second bending section 2014 of the main body part 201 and matches the shape of the second bending section 2014. Exemplarily, the second insulation sub-part 4032 can be a bent tube.

[0121] The first insulation part 401 can wrap around the portion of the first connecting part 202 directly connected to the main body part 201, and the second insulation part 402 can wrap around the portion of the second connecting part 203 directly connected to the main body part 201.

[0122] In some embodiments, along the arrangement direction of the first insulation part 401 and the third insulation part 403, the length of the first connecting part 202 wrapped by the first insulation part 401 can account for 0.1-0.3 of the total length of the first connecting part 202, thereby reducing the influence on the connection effect between the first connecting part 202 and the end cover 30 of one cylindrical battery 1.

[0123] In some embodiments, along the arrangement direction of the second insulation part 402 and the third insulation part 403, the length of the second connecting part 203 wrapped by the second insulation part 402 can account for 0.1-0.3 of the total length of the second connecting part 203, thereby reducing the influence on the connection effect between the second connecting part 203 and the end cover 30 or the bottom wall 12 of another cylindrical battery 1.

[0124] The first insulation part 4 not only wraps around the main body part 201 but also wraps around the portions of the first connecting part 202 and the second connecting part 203 close to the main body part 201, increasing the wrapping area of the first insulation part 4 on the busbar 2 and being conducive to improving the insulation effect of the first insulation part 4.

[0125] As shown in FIGS. 8 and 9, in some embodiments, the busbar 2 includes a first protruding part 204. Along the direction of the first connecting part 202 pointing to one cylindrical battery 1, the first protruding part 204 is arranged and protrudes from the first connecting part 202, and the first protruding part 204 is connected to the end cover 30 of one cylindrical battery 1, thereby electrically connecting the busbar 2 and one cylindrical battery 1.

[0126] In some embodiments, the first insulation part 401 does not exceed the first protrusion 204 in the direction of the first connecting part 202 pointing to one cylindrical battery 1.

[0127] In some embodiments, the first insulation part 401 does not exceed the first protrusion 204 in the direction of the first connecting part 202 pointing to one cylindrical battery 1.

[0128] In some embodiments, the number of the first protrusions 204 is one. In some embodiments, the number of the first protrusions 204 is two or more, which increases the stability and overcurrent area of the electrical connection between the busbar 2 and one cylindrical battery 1.

[0129] In some embodiments, the busbar 2 comprises a second protrusion 205. The second protrusion 205 is arranged and protrudes from the second connecting part 203 in the direction of the second connecting part 203 pointing to another cylindrical battery 1, and the second insulation part 402 does not exceed the second protrusion 205.

[0130] In some embodiments, the number of the second protrusions 205 is one. In some embodiments, the number of the second protrusions 205 is two or more, which increases the stability and overcurrent area of the electrical connection between the busbar 2 and another cylindrical battery 1.

[0131] When the arrangement directions of the two adjacent cylindrical batteries 1 are opposite, the second protrusion 205 connects with the bottom wall 12 of another cylindrical battery 1, thereby electrically connecting the busbar 2 and another cylindrical battery 1.

[0132] When the arrangement directions of the two adjacent cylindrical batteries 1 are the same, the second protrusion 205 connects with the end cover 30 of another cylindrical battery 1, thereby electrically connecting the busbar 2 and another cylindrical battery 1.

[0133] Since the first insulation part 401 does not exceed the first protrusion 204 in the direction of the first connecting part 202 pointing to one cylindrical battery 1, the first insulation part 401 is less likely to interfere with the end cover 30 of one cylindrical battery 1 when the first protrusion 204 and the end cover 30 of one cylindrical battery 1 are welded, thereby facilitating the welding of the first protrusion 204 and the end cover 30 of one cylindrical battery 1.

[0134] Since the second insulation part 402 does not exceed the second protrusion 205 in the direction of the second connecting part 203 pointing to another cylindrical battery 1, the second insulation part 402 is less likely to interfere with the end cover 30 or the bottom wall 12 of another cylindrical battery 1 when the second protrusion 205 and the end cover 30 or the bottom wall 12 of another cylindrical battery 1 are welded, thereby facilitating the welding of the second protrusion 205 and the end cover 30 or the bottom wall 12 of another cylindrical battery 1.

[0135] As shown in FIG. 3 and FIG. 6, in some embodiments, the cylindrical battery 1 further comprises an insulation film 60, the insulation film 60 is sleeved on the shell 10, and a portion of the insulation film 60 covers the bending portion 132 in the axial direction X of the cylindrical battery 1. The portion of the insulation film 60 of one cylindrical battery 1 is located between the bending portion 132 and the main body portion 201 in the axial direction X of the cylindrical battery 1.

[0136] The portion of the insulation film 60 is located on the side of the bending portion 132 away from the bottom wall 12 and on the side of the main body portion 201 facing the bending portion 132 in the axial direction X of the cylindrical battery 1.

[0137] The portion of the insulation film 60 can be in direct contact with the bending portion 132, and other insulation components can be arranged between the portion of the insulation film 60 and the bending portion 132.

[0138] In the axial direction X of the cylindrical battery 1, the portion of the insulation film 60 can be arranged apart from the main body portion 201, a gap can be formed between the portion of the insulation film 60 and the main body portion 201, or other insulation components can be arranged.

[0139] Optionally, the insulation film 60 can comprise a first portion 61 and a second portion 62. The first portion 61 is arranged on the outer side of the shell 10 in the radial direction of the cylindrical battery 1 and covers at least part of the side wall main body 131. The second portion 62 is connected to the first portion 61 and is located between the bending portion 132 and the main body portion 201 in the axial direction X of the cylindrical battery 1 and covers the bending portion 132. In other words, in the axial direction X of the cylindrical battery 1, the projection of the bending portion 132 is located within the projection of the second portion 62.

[0140] Optionally, the first portion 61 covers the entire side wall main body 131, and the insulation film 60 further comprises a third portion 63 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 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 facilitates the connection of the bus bar 2.

[0141] The insulation film 60 can at least shield the bending portion 132, insulate and isolate the bending portion 132 from the main body portion 201, and facilitate reducing the risk of short circuit of the cylindrical battery 1.

[0142] In some embodiments, the insulation film 60 can be a heat-shrinkable film. When the cylindrical battery 1 is heated, the insulation film 60 shrinks and tightly adheres to the surface of the shell 10, forming a protective film tightly covering the shell 10.

[0143] The insulation film 60 can comprise a polyolefin material, for example, the insulation film 60 can comprise polyethylene, polypropylene or other suitable materials.

[0144] As shown in FIG. 6, in some embodiments, the cylindrical battery 1 further comprises a second insulating piece 70, at least a part of the second insulating piece 70 is arranged between the bending part 132 and the insulating film 60 in the axial direction X of the cylindrical battery 1.

[0145] The second insulating piece 70 can be arranged between the bending part 132 and the insulating film 60 as a whole, or only a part of the second insulating piece 70 can be arranged between the bending part 132 and the insulating film 60, and another part of the second insulating piece 70 can extend beyond the bending part 132 towards the direction close to the axis a of the cylindrical battery 1, for example.

[0146] The second insulating piece 70 can be connected to the bending part 132 by adhesion, welding, hot pressing or other suitable means, or the second insulating piece 70 and the bending part 132 can only be in contact with each other.

[0147] In the axial direction X of the cylindrical battery 1, the insulating film 60 can cover at least a part of the second insulating piece 70, so as to cover and limit the second insulating piece 70 by the insulating film 60, thereby facilitating to improve the installation stability of the second insulating piece 70.

[0148] The second insulating piece 70 and the insulating film 60 can have a double insulation and isolation effect. After the insulating film 60 is damaged due to corrosion, tearing or other reasons, the insulation and isolation between the bending part 132 and the main body part 201 can still be achieved by the second insulating piece 70, thereby facilitating to further reduce the risk of short circuit of the cylindrical battery 1.

[0149] As shown in FIG. 2, in some embodiments, one cylindrical battery 1 and another cylindrical battery 1 are arranged in a first direction Y, and the first direction Y is perpendicular to the axial direction X of the cylindrical battery 1. The second connecting part 203 is connected to the bottom wall 12 of the other cylindrical battery 1.

[0150] Alternatively, the arrangement direction of one cylindrical battery 1 and another cylindrical battery 1 is opposite. For example, the end cover 30 of one cylindrical battery 1 is located at one end in the axial direction of the cylindrical battery 1, and the end cover 30 of another cylindrical battery 1 is located at the other end in the axial direction of the cylindrical battery 1. The end cover 30 of one cylindrical battery 1 and the bottom wall 12 of another cylindrical battery 1 are located at the same end in the axial direction X.

[0151] The first connecting part 202 is connected to the end cover 30 of one cylindrical battery 1, the second connecting part 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.

[0152] The first connecting part 202, the main body part 201 and the second connecting part 203 of the busbar 2 can be arranged in the first direction Y in sequence.

[0153] As shown in FIG. 1 and FIG. 2, in some embodiments, the battery module 100 further comprises a bracket 3 having a plurality of accommodating cavities 301 in which the plurality of cylindrical batteries 1 are arranged. The bracket 3 can limit the cylindrical batteries 1 in the accommodating cavities 301, which is conducive to reducing the shaking or vibration of the cylindrical batteries 1 and improving the installation stability of the cylindrical batteries 1.

[0154] In some embodiments, the plurality of accommodating cavities 301 can be provided, and the plurality of cylindrical batteries 1 are arranged in the plurality of accommodating cavities 301, respectively.

[0155] The bracket 3 can comprise an insulating material to insulate and isolate the cylindrical batteries 1 in different accommodating cavities 301.

[0156] The plurality of accommodating cavities 301 can be arranged along the first direction Y.

[0157] In some examples, the cylindrical batteries 1 and the accommodating cavities 301 can be arranged one-to-one, and each accommodating cavity 301 accommodates only one cylindrical battery 1.

[0158] In other examples, the cylindrical batteries 1 and the accommodating cavities 301 can also be arranged many-to-one, and each accommodating cavity 301 can accommodate at least two cylindrical batteries 1.

[0159] Alternatively, a communication channel can be provided between the two adjacent accommodating cavities 301.

[0160] Alternatively, a communication channel can be provided between the two adjacent accommodating cavities 301.

[0161] The plurality of cylindrical batteries 1 are arranged in the plurality of accommodating cavities 301, respectively, and the cylindrical batteries 1 in the adjacent accommodating cavities 301 can be isolated, which is conducive to reducing the risk of short-circuiting or other mutual influences of the cylindrical batteries 1 in the adjacent accommodating cavities 301.

[0162] In some embodiments, each accommodating cavity 301 is provided with an opening 302 at both ends along the axial direction X of the cylindrical battery 1. The first connecting portion 202 of the busbar 2 is arranged in one opening 302 and connected to the end cover 30 of one cylindrical battery 1, and the second connecting portion 203 is arranged in the other opening 302 and connected to the bottom wall 12 of the other cylindrical battery 1.

[0163] The bracket 3 can comprise two end walls 303 arranged oppositely 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 to form the plurality of accommodating cavities 301. The opening 302 can penetrate the end wall 303 along the axial direction X of the cylindrical battery 1, and the accommodating cavity 301 is communicated with the outside of the bracket 3 through the opening 302.

[0164] At least part of the end cover 30 of each cylindrical battery 1 and at least part of the bottom wall 12 can be exposed outside the holder 3 through two openings 302 at two ends of the accommodating cavity 301, so as to facilitate connection of the busbar 2.

[0165] The first connecting part 202 and the holder 3 are arranged at intervals from the wall surface of the opening 302, the second connecting part 203 and the holder 3 are arranged at intervals from the wall surface of the other opening 302, and part of the main body part 201 can be arranged inside the opening 302, and the other part of the main body part 201 can be arranged outside the opening 302. In this way, the interference between the main body part 201 and the holder 3 can be reduced, and the assembly efficiency can be improved.

[0166] The holder 3 is provided with the opening 302, which facilitates the axial positioning of the cylindrical battery 1 by the holder 3 and facilitates the connection of the busbar 2 to the end cover 30 and the bottom wall 12 of the cylindrical battery 1. Moreover, the first connecting part 202 and the second connecting part 203 are arranged inside the opening 302, and can share at least part of the space in the axial direction X with the holder 3, which is beneficial to save space and improve structural compactness.

[0167] In some embodiments, the diameter of the accommodating cavity 301 can 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 part of the end cover 30 and part of the bottom wall 12 are exposed outside the holder 3 through the two openings 302 at the two 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.

[0168] In order to facilitate the loading of the cylindrical battery 1 into the accommodating cavity 301, the holder 3 can include a first holder 3a and a second holder 3b arranged in a direction parallel to the axial direction X, and the first holder 3a is connected to the second holder 3b. The first holder 3a and the second holder 3b together form a plurality of accommodating cavities 301.

[0169] The first holder 3a and the second holder 3b are both cylindrical structures, one of the end walls 303 is arranged at one end of the first holder 3a away from the second holder 3b, and the other end wall 303 is arranged at one end of the second holder 3b away from the first holder 3a.

[0170] The first holder 3a has a first peripheral wall surrounding the one end wall 303, the second holder 3b has a second peripheral wall surrounding the other end wall 303, and the peripheral wall 304 can include the first peripheral wall and the second peripheral wall.

[0171] During assembly, the plurality of cylindrical batteries 1 can be first loaded into one of the first holder 3a and the second holder 3b, and then the first holder 3a and the second holder 3b can be connected to limit the plurality of cylindrical batteries 1 in the holder 3.

[0172] In some embodiments, neither the first connecting portion 202 nor the second connecting portion 203 protrudes beyond the outer end surface of the bracket 3 facing away from the accommodation cavity 301 along the axial direction X of the cylindrical battery 1. The first connecting portion 202 and the second connecting portion 203 can be entirely within the opening 302, and the first connecting portion 202 and the second connecting portion 203 do not occupy additional space along the axial direction X, which is conducive to further improving the structural compactness and the energy density of the battery module 100.

[0173] 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 one opening 302 accommodating the first connecting portion 202 and another opening 302 accommodating the second connecting portion 203. At least part of the main body portion 201 is accommodated in the second recess 305.

[0174] In combination with FIG. 6, along the axial direction X of the cylindrical battery 1, the second recess 305 can be recessed in the outer end surface 3031 of the bracket 3 facing the accommodation cavity 301. Alternatively, the second recess 305 is formed in the end wall 303, and the outer end surface 3031 can be a side surface of the end wall 303 facing away from the accommodation cavity 301.

[0175] In the direction of the bending portion 132 pointing to the main body portion 201, the main body portion 201 does not protrude beyond the outer end surface 3031 of the bracket 3. The surface of the main body portion 201 facing away from the bending portion 132 can be flush with the outer end surface 3031, or the surface of the main body portion 201 facing away from the bending portion 132 can be located on the side of the outer end surface 3031 facing the accommodation cavity 301.

[0176] The second recess 305 can provide at least part of the accommodation space for the main body portion 201, and the main body portion 201 and the bracket 3 can share at least part of the space along the axial direction X, which is conducive to saving space and improving the structural compactness and the energy density of the battery module 100.

[0177] In some embodiments, the bracket 3 is provided with a second recess 305 on the other side 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 can be alternately arranged along the first direction Y.

[0178] In some embodiments, the main body portion 201 can be entirely accommodated in the second recess 305, or only part of the main body portion 201 can be accommodated in the second recess 305, and the other part of the main body portion 201 can be accommodated in the opening 302.

[0179] As shown in FIGS. 7 and 8, in some embodiments, in the direction of the bending portion 132 pointing to the main body portion 201, the third insulating portion 403 of the first insulating member 4 does not protrude beyond the outer end surface 3031 of the bracket 3, and the first insulating member 4 and the bracket 3 can share the space along the axial direction X, which is conducive to improving the structural compactness and the energy density of the battery module 100.

[0180] As shown in FIG. 2, FIG. 7 and FIG. 8, in some embodiments, the bracket 3 comprises a protrusion 306 protruding from a bottom surface 3051 of the second recess 305. The main body portion 201 comprises a first through hole 2015, and the protrusion 306 is arranged through the first through hole 2015.

[0181] The protrusion 306 can extend from the bottom surface 3051 in a direction away from the accommodation cavity 301.

[0182] The number of the protrusions 306 and the first through holes 2015 can be one or more, and the protrusions 306 and the first through holes 2015 are arranged one by one.

[0183] The plug-in fit of the protrusion 306 and the first through hole 2015 can limit the movement of the busbar 2 relative to the bracket 3, and the bracket 3 and the busbar 2 can be pre-positioned through the plug-in fit of the protrusion 306 and the first through hole 2015, facilitating the assembly and connection of the busbar 2 and the cylindrical battery 1.

[0184] In some embodiments, the first insulating member 4 comprises a second through hole 4034, and the second through hole 4034 and the first through hole 2015 are through, and the protrusion 306 is arranged through the first through hole 2015 and the second through hole 4034.

[0185] The number of the second through holes 4034 can correspond to the number of the protrusions 306, and the protrusions 306 and the second through holes 4034 are arranged one by one.

[0186] In some embodiments, the first insulating member comprises a first layer facing one side of the main body portion 201 and a second layer facing away from the other side of the main body portion 201, and the second through hole 4034 is arranged on both the first layer and the second layer. The second through hole 4034 of the first layer, the first through hole 2015 of the main body portion 201 and the second through hole 4034 of the second layer are through, and the protrusion 306 is arranged through the second through hole 4034 of the first layer, the first through hole 2015 of the main body portion 201 and the second through hole 4034 of the second layer.

[0187] The plug-in fit of the protrusion 306 and the first through hole 2015 and the second through hole 4034 can limit the movement of the first insulating member 4 relative to the busbar 2, and the first insulating member 4 and the busbar 2 can be positioned through the plug-in fit of the protrusion 306 and the first through hole 2015 and the second through hole 4034. In harsh environments, the risk of the first insulating member 4 being separated from the busbar 2 is reduced, and the safety and reliability of the cylindrical battery 1 are improved.

[0188] In some embodiments, in the axial direction X of the cylindrical battery 1, a part of the bracket 3 is located between the main body portion 201 and the bent portion 132 of one cylindrical battery 1.

[0189] Optionally, along the axial direction X of the cylindrical battery 1, at least part of the bracket 3 corresponding to the second recess 305 is located between the main body 201 and the bending portion 132 of one cylindrical battery 1.

[0190] Optionally, part of the end wall 303 of the bracket 3 is located between the main body 201 and the bending portion 132 of one cylindrical battery 1.

[0191] Along the radial direction of the cylindrical battery 1, the part of the bracket 3 located between the main body 201 and the bending portion 132 of one cylindrical battery 1 can protrude beyond the bending portion 132 in a direction facing the axis a of one cylindrical battery 1.

[0192] The part of the bracket 3 located between the main body 201 and the bending portion 132 of one cylindrical battery 1 can insulate and isolate the main body 201 and the bending portion 132 of one cylindrical battery 1, which is conducive to further reducing the risk of short circuit.

[0193] The first insulating member 4, the part of the bracket 3 located between the main body 201 and the bending portion 132 of one cylindrical battery 1, the insulating film 60, and the second insulating member 70 can form a multi-layer insulation structure, which is conducive to improving the insulation effect and thus reducing the risk of short circuit as much as possible.

[0194] FIG. 12 is a structural schematic diagram of an electric device provided by some embodiments of the present application. As shown in FIG. 12, the present application further provides an electric device 1000, which includes the battery module 100 provided by any of the foregoing embodiments. The battery module 100 can provide electric energy for the work of the electric device 1000.

[0195] The electric device 1000 of the embodiments of the present application can be a portable device, a notebook 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 dust collector, a sweeping robot, etc. The embodiments of the present application do not specially limit the above-mentioned electric devices.

[0196] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the present application, and equivalent components can be substituted therefor, especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed herein.

[0197] The above description is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A battery module, characterized by, The battery module comprises a plurality of cylindrical batteries and a plurality of busbars connecting 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, and the electrode assembly is accommodated in the shell, 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; The end of the side wall away from the bottom wall is bent towards the axis of the cylindrical battery and forms a bent portion; The busbar comprises a main body portion, a first connecting portion and a second connecting portion, 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; The main body portion is provided with a first recess on one side facing the bent portion, and the projection of the first recess along the axial direction partially overlaps the projection of the bent portion along the axial direction.

2. The battery module of claim 1, wherein, The battery module further comprises a first insulating member connected to the busbar; At least part of the first insulating member is accommodated in the first recess and located between the main body portion and the bent portion.

3. The battery module of claim 2, wherein, The first insulating member completely covers the first recess.

4. The battery module according to claim 2 or 3, characterized in that, The first insulating member wraps the main body portion.

5. The battery module of claim 4, wherein, The first insulating member comprises a first insulating portion, a second insulating portion and a third insulating portion, 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 portion, the first insulating portion wraps the part of the first connecting portion close to the main body portion, and the second insulating portion wraps the part of the second connecting portion close to the main body portion.

6. The battery module of any one of claims 2-5, wherein, The battery module further comprises a support having accommodating cavities, and the plurality of cylindrical batteries are arranged in the accommodating cavities.

7. The battery module of claim 6, wherein, Each of the accommodating cavities is provided with an opening at both ends along the axial direction; The first connecting portion is arranged in one of the openings and connected to the end cap of one cylindrical battery, and the second connecting portion is arranged in another of the openings and connected to the bottom wall of another cylindrical battery.

8. The battery module of claim 6, wherein, Each of the accommodating cavities is provided with an opening at both ends along the axial direction; The first connecting portion is arranged in one of the openings and connected to the end cap of one cylindrical battery, and the second connecting portion is arranged in another of the openings and connected to the end cap of another cylindrical battery.

9. The battery module according to claim 7 or 8, characterized in that The support is provided with a second recess on one side along the axial direction, and the second recess communicates one of the openings accommodating the first connecting portion and another of the openings accommodating the second connecting portion; At least part of the main body portion is accommodated in the second recess.

10. The battery module of claim 9, wherein, The support comprises a protrusion protruding from the bottom surface of the second recess; The main body portion comprises a first through hole, and the protrusion is arranged in the first through hole.

11. The battery module of claim 10, wherein, The first insulating member comprises a second through hole, and the second through hole and the first through hole are through; The protrusion is arranged in the first through hole and the second through hole at the same time.

12. The battery module of any one of claims 9-11, wherein, In the axial direction, part of the support is located between the main body portion and the bent portion of the one cylindrical battery.

13. The battery module of claim 12, wherein, the bracket comprises two end walls arranged opposite to each other along an axial direction of the cylindrical battery and a peripheral wall connected between the two end walls, and the two end walls and the peripheral wall enclose the accommodating cavity; at least a portion of one end wall of the bracket is located between the main body portion and the bent portion of one of the cylindrical batteries; the second recess is located in the end wall.

14. The battery module of any one of claims 1-13, wherein, in the axial direction, the main body portion protrudes from a surface of the first connecting portion facing away from the end cover.

15. The battery module of any one of claims 1-14, wherein, the main body portion comprises a converging section, a first bent section and a second bent section, the first bent section connects the first connecting portion and the converging section, and the second bent section connects the second connecting portion and the converging section; the converging section, the first bent section and the second bent section define the first recess.

16. The battery module of claim 15, wherein, in the axial direction, a projection of the first bent section is separated from a projection of the bent portion of the one cylindrical battery, and a projection of the second bent section is located within a projection of the other cylindrical battery.

17. The battery module of any one of claims 1-16, wherein, the cylindrical battery further comprises an insulating film, the insulating film is sleeved on the shell, and a portion 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.

18. The battery module of claim 17, wherein, the cylindrical battery further comprises a second insulating member, at least a portion of the second insulating member is arranged between the bent portion and the insulating film in the axial direction.

19. The battery module of any one of claims 1-18, wherein, 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 a bottom wall of the other cylindrical battery.

20. The battery module of any one of claims 1-19, wherein, the electrode assembly comprises a first electrode end and a second electrode end with opposite polarities, the first electrode end is connected to the shell, and the second electrode end is connected to the end cover.

21. An electrical device, comprising: a battery module according to any one of claims 1-20.

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