Battery and electric equipment

Abstract

The utility model relates to the technical field of battery structures, and provides a battery and electric equipment.The battery comprises a confluence piece and at least one battery monomer group, each battery monomer group comprises a first battery monomer and a second battery monomer which are adjacently arranged, and the confluence piece comprises a first connecting structure and a second connecting structure; the third connecting structure is connected with the first connecting structure and the second connecting structure, the first connecting structure is connected to the first top cover piece, and the second connecting structure is connected to the second shell; a gap is formed between the third connecting structure and the first shell; according to the battery provided by the embodiment of the invention, the gap is formed between the third connecting structure and the first shell, so that the risk of short circuit between the third connecting structure and the first shell is effectively reduced.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, batteries, as the power source of electric vehicles, play an irreplaceable and important role.

[0003] In some types of battery cells, such as battery cells with a groove structure, according to the characteristics of the battery cell itself, its shell and top cover are respectively connected to the positive and negative ears of the electrode assembly and connected to the outside for charging and discharging, so its shell and top cover are both charged.

[0004] However, when battery cells with charged housings and top cover sheets are connected to form a group through a bus bar, the bus bar is prone to accidentally touch the housing and cause a short circuit. Utility Model Content

[0005] The purpose of the embodiments of the present application is to provide a battery and an electrical device, aiming to solve the problem that when the shell and the top cover of the battery cell are charged, the busbar is prone to accidentally touch the shell and cause a short circuit.

[0006] To achieve the above purpose, the technical solution adopted in the embodiment of the present application is:

[0007] In a first aspect, an embodiment of the present application provides a battery, comprising a busbar and at least one group of battery cells, the battery cell group comprising a first battery cell and a second battery cell arranged adjacent to each other; the first battery cell comprising a first shell and a first top cover sheet sealed on the first shell, the second battery cell comprising a second shell and a second top cover sheet sealed on the second shell; the busbar comprises a first connecting structure, a second connecting structure, and a third connecting structure connecting the first connecting structure and the second connecting structure, the first connecting structure being connected to the first top cover sheet, and the second connecting structure being connected to the second shell; wherein a gap is formed between the third connecting structure and the first shell.

[0008] Beneficial effects of the embodiments of the present application: The battery provided in the embodiments of the present application is connected to the first top cover sheet by using the first connection structure of the bus bar, and is connected to the second shell by using the second connection structure, and the first connection structure and the second connection structure are connected through the third connection structure to achieve electrical connection between the adjacent first battery cells and the second battery cells, and by forming a gap between the third connection structure and the first shell, the risk of short circuit between the third connection structure and the first shell is effectively reduced.

[0009] In some embodiments, in the axial direction of the first shell, at least part of the first top cover sheet protrudes outside the first shell and forms a height difference with the first shell, and the first connecting structure is connected to the part of the first top cover sheet located outside the first shell; the third connecting structure includes a main body, the main body is bent toward the second shell to form a first bending portion, the main body is connected to the first connecting structure, and the first bending portion is connected to the second connecting structure; gaps are formed between the main body and the first bending portion and the first shell respectively.

[0010] By adopting the above-mentioned technical solution, gaps are formed between the main body and the first bending portion of the third connecting structure and the first shell respectively, thereby reducing the risk of short circuit between the third connecting structure and the first shell, that is, reducing the risk of overlapping short circuit between the bus bar and the first shell and the first top cover plate.

[0011] In some embodiments, a gap is formed between the main body and the first shell in the thickness direction of the first top cover sheet; and a gap is formed between the first bending portion and the first shell in a direction perpendicular to the thickness direction of the first top cover sheet.

[0012] By adopting the above-mentioned technical solution, a gap is formed between the main body and the first shell along the thickness direction of the first top cover sheet, and a gap is formed between the first bent portion and the first shell along a direction perpendicular to the thickness direction of the first top cover sheet, so as to reduce the risk of overlapping short circuit between the bus bar and the first shell and the first top cover sheet.

[0013] In some embodiments, in the radial direction of the first shell, the distance between the end of the first bending portion facing the first shell and the first shell is W, the outer diameter of the first shell is R, and 0.05≤W / R<1.

[0014] By adopting the above-mentioned technical solution, by limiting the ratio of the distance W between the end of the first bent portion toward the first shell and the first shell to the outer diameter R of the first shell to be greater than or equal to 0.05 and less than 1, the position of the end of the first bent portion toward the first shell can be limited, so that a gap can be maintained between the end of the first bent portion toward the first shell and the first shell, so as to effectively reduce the risk of short circuit between the first bent portion and the first shell.

[0015] In some embodiments, 0.1≤W / R<0.5.

[0016] By adopting the above-mentioned technical solution, by further limiting the ratio of the distance W between the end of the first bending portion toward the first shell and the first shell to the outer diameter R of the first shell to be greater than or equal to 0.1 and less than 0.5, the position of the end of the first bending portion toward the first shell is further limited, thereby further improving the problem of short circuit between the first bending portion and the first shell.

[0017] In some embodiments, in the axial direction of the first shell, the first top cover sheet is flush with the end of the first shell, or the first top cover sheet is arranged within the range of the first shell; the third connecting structure includes a main body, one end of the main body is bent toward the first top cover sheet to form a second bending portion, and the other end of the main body is bent toward the second shell to form a third bending portion; the main body, the second bending portion and the third bending portion respectively form gaps with the first shell.

[0018] By adopting the above-mentioned technical solution, gaps are formed between the main body, the second bending portion and the third bending portion of the third connecting structure and the first shell respectively, thereby reducing the risk of short circuit between the third connecting structure and the first shell, that is, reducing the risk of overlapping short circuit between the bus bar and the first shell and the first top cover plate.

[0019] In some embodiments, in the thickness direction of the first top cover sheet, a gap is formed between the main body and the first shell; in a direction perpendicular to the thickness direction of the first top cover sheet, a gap is formed between the second bend portion and the first shell, and a gap is formed between the third bend portion and the first shell.

[0020] By adopting the above-mentioned technical solution, a gap is formed between the main body and the first shell along the thickness direction of the first top cover sheet, and gaps are formed between the second bent portion and the third bent portion and the first shell along a direction perpendicular to the thickness direction of the first top cover sheet, respectively, so as to reduce the risk of overlapping short circuit between the bus bar and the first shell and the first top cover sheet.

[0021] In some embodiments, in the axial direction of the first shell, a distance between an end of the main body portion facing the first shell and the first shell is H, and 0<H≤10 mm.

[0022] By adopting the above-mentioned technical solution, by limiting the distance H between the end of the main body toward the first shell and the first shell to be greater than 0 and less than or equal to 10 mm, a gap can be formed between the main body and the end of the first shell, and the distance of the gap can be limited to reduce the impact on the space occupied by the battery.

[0023] In some embodiments, 1 mm ≤ H ≤ 7 mm.

[0024] By adopting the above technical solution, by further limiting the distance H between the end of the main body toward the first shell and the first shell, the short circuit problem between the main body and the end of the first shell can be further improved, and the impact on the space occupied by the battery can be further reduced.

[0025] In some embodiments, in the radial direction of the first shell, the distance between the end of the third bending portion facing the first shell and the first shell is M, the outer diameter of the first shell is R, and 0.05≤M / R<1.

[0026] By adopting the above-mentioned technical solution, the ratio of the distance M between the end of the third bend portion facing the first shell and the first shell, and the outer diameter R of the first shell is limited to be greater than or equal to 0.05 and less than 1, so that the position of the end of the third bend portion facing the first shell can be limited, so that a gap can be maintained between the end of the third bend portion facing the first shell and the first shell, so as to effectively reduce the risk of short circuit between the third bend portion and the first shell.

[0027] In some embodiments, 0.1≤M / R<0.5.

[0028] By adopting the above-mentioned technical solution, by further limiting the ratio of the distance W between the end of the third bend portion toward the first shell and the first shell to the outer diameter R of the third shell to be greater than or equal to 0.1 and less than 0.5, the position of the end of the third bend portion toward the first shell is further limited, thereby further improving the problem of short circuit between the third bend portion and the first shell.

[0029] In some embodiments, an insulating structure is disposed in the gap between the third connecting structure and the first shell.

[0030] By adopting the above technical solution, on the basis of forming a gap between the third connection structure and the first shell, an insulating structure is provided in the gap, which can further reduce the probability of short circuit between the third connection structure and the first shell.

[0031] In some embodiments, the second connection structure is connected to an end side surface of the second shell; and / or, the second connection structure is connected to a peripheral side surface of the second shell.

[0032] By adopting the above-mentioned technical solution, the second connecting structure can be connected to both the end side surface and the peripheral side surface of the second shell. The second connecting structure can also be connected to both the end side surface and the peripheral side surface of the second shell at the same time to realize the electrical connection between the first battery cell and the second battery cell.

[0033] In some embodiments, the first connection structure is a ring-shaped structure.

[0034] By adopting the above technical solution, when the first connecting structure with an annular structure is connected to the first top cover sheet, the structural components on the top cover sheet can be avoided.

[0035] In some embodiments, the first connection structure is a circular ring structure, the outer diameter of the first connection structure is J, the outer diameter of the first shell is R, and 0.1<J / R<0.9.

[0036] By adopting the above technical solution, by limiting the ratio of the outer diameter J of the first connecting structure to the outer diameter R of the first shell to be greater than 0.1 and less than 0.9, the size of the first connecting structure relative to the first shell can be limited so that the first connecting structure can form an electrical connection with the first top cover sheet.

[0037] In some embodiments, 0.3≤J / R≤0.8.

[0038] By adopting the above-mentioned technical solution, the ratio of the outer diameter J of the first connecting structure to the outer diameter R of the first shell is further limited to be greater than or equal to 0.3 and less than or equal to 0.8, so as to further limit the size of the first connecting structure relative to the first shell, thereby improving the connection effect between the first connecting structure and the first top cover sheet.

[0039] In some embodiments, the second connection structure is an annular structure, and a relief opening is provided on the second connection structure.

[0040] By adopting the above-mentioned technical solution, the second connecting structure in an annular structure can be connected to the end face of the second shell, and can also be sleeved and connected to the peripheral side face of the second shell; and when the battery cell group also includes other battery cells, the number of bus bars used should be greater than one, thereby, the avoidance opening of one bus bar can avoid the third connecting structure of another adjacent bus bar, so as to reduce the probability of short circuit between two adjacent bus bars.

[0041] In some embodiments, the third connection structure has an extension direction, and in a direction perpendicular to the extension direction, gaps are formed between two opposite ends of the third connection structure and the avoidance opening.

[0042] By adopting the above-mentioned technical solution, when the number of busbars used is two or more, the third connecting structure of one of the busbars is passed through the avoidance opening of another adjacent busbar for avoidance. At this time, a gap can be formed between the third connecting structure passed through the avoidance hole and the two opposite ends of the avoidance opening, thereby reducing the probability of short circuit between the two adjacent busbars.

[0043] In some embodiments, in a direction perpendicular to the extension direction, a distance D and a distance F are respectively formed between the two opposite ends of the third connection structure and the avoidance opening, wherein 0<D≤10mm, 0<F≤10mm.

[0044] By adopting the above-mentioned technical solution, by limiting the distance D and the distance F respectively formed between the two opposite ends of the third connecting structure and the avoidance opening to be greater than 0 and less than or equal to 10 mm, it is possible to form a sufficient gap between two adjacent bus bars when two or more bus bars are used.

[0045] In some embodiments, the second connection structure is a circular ring structure, the outer diameter of the second connection structure is K, the outer diameter of the second shell is L, and 0.5<K / L≤1.2.

[0046] By adopting the above technical solution, by limiting the ratio of the outer diameter K of the second connecting structure to the outer diameter L of the second shell to be greater than 0.5 and less than or equal to 1.2, the size of the second connecting structure relative to the second shell can be limited so that the second connecting structure can form an electrical connection with the second shell.

[0047] In some embodiments, 0.8≤K / L≤1.2.

[0048] By adopting the above technical solution, the ratio of the outer diameter K of the second connecting structure to the outer diameter L of the second shell is further limited to be greater than or equal to 0.8 and less than or equal to 1.2, so as to further limit the size of the second connecting structure relative to the second shell, thereby improving the connection effect between the second connecting structure and the second shell.

[0049] In some embodiments, in the axial direction of the first shell, the first top cover sheet and the second top cover sheet are arranged on the same side; or, in the axial direction of the first shell, the first top cover sheet and the second top cover sheet are respectively arranged on two opposite sides.

[0050] By adopting the above-mentioned technical solution, when the first top cover sheet and the second top cover sheet are arranged on the same side or the first top cover sheet and the second top cover sheet are respectively arranged on two opposite sides, the electrical connection between the first battery cell and the second battery cell can be achieved by connecting to the first top cover sheet through the first connecting structure, connecting to the second shell through the second connecting structure, and connecting the first connecting structure and the second connecting structure through the third connecting structure.

[0051] In a second aspect, an embodiment of the present application further provides an electrical device, including a battery as described above, and the battery is used to provide electrical energy.

[0052] Beneficial effects of the embodiments of the present application: The electrical equipment provided by the embodiments of the present application includes the above-mentioned battery. When the probability of short-circuiting the busbars of the above-mentioned battery is low, the operation of the electrical equipment is more stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0054] Figure 1 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application;

[0055] Figure 2 An exploded view of a battery provided in an embodiment of the present application;

[0056] Figure 3 A schematic diagram of the exploded structure of a battery cell provided in an embodiment of the present application;

[0057] Figure 4 A schematic diagram of the connection between a battery cell group and a busbar provided in an embodiment of the present application;

[0058] Figure 5 A cross-sectional view of a battery cell group and a busbar connected together according to an embodiment of the present application;

[0059] Figure 6 for Figure 5 A local enlarged schematic diagram of point A;

[0060] Figure 7 A schematic diagram of the structure of a busbar provided in an embodiment of the present application;

[0061] Figure 8 A cross-sectional view of another battery cell group and a busbar connected in an embodiment of the present application;

[0062] Fig. 9 for Figure 8 A local enlarged schematic diagram of point A;

[0063] Fig.10 A schematic diagram of the structure of another busbar provided in an embodiment of the present application;

[0064] Fig.11 A schematic diagram of another connection between a battery cell group and a busbar provided in an embodiment of the present application;

[0065] Fig.12 A schematic diagram of the connection between a battery cell group and a bus bar when the first top cover sheet and the second top cover sheet provided in an embodiment of the present application are not on the same side.

[0066] Among them, the reference numerals in the figure are:

[0067] 1000. Vehicles;

[0068] 100, battery; 110, battery cell group; 200, controller; 300, motor;

[0069] 10. Box body; 11. First part; 12. Second part; 20. Battery cell; 21. Top cover sheet; 21a; 22. Shell; 23. Electrode assembly; 23a. Tab;

[0070] 30. first battery cell; 31. first top cover sheet; 32. first shell;

[0071] 40. second battery cell; 41. second top cover sheet; 42. second housing;

[0072] 50. busbar; 51. first connection structure; 52. second connection structure; 521. avoidance; 53. third connection structure; 531. main body; 532. first bending portion; 533. second bending portion; 534. third bending portion;

[0073] Z, axial direction; X, radial direction; S, extension direction. DETAILED DESCRIPTION

[0074] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0075] In the description of the present application, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0076] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0077] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0078] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, batteries play an irreplaceable and important role as the power source of electric vehicles. In some types of battery cells, such as battery cells with a grooved structure, according to the characteristics of the battery cell itself, its shell and top cover are respectively connected to the positive and negative ears of the electrode assembly and connected to the outside for charging and discharging, so its shell and top cover are both charged. However, when such battery cells with charged shells and top cover are connected into groups through a bus, the bus is prone to accidental contact with the shell, resulting in a short circuit.

[0079] Based on the above considerations, in order to solve the problem that when the shell and top cover of the battery cell are charged, the bus bar is easily accidentally touched by the shell and causes a short circuit, a battery is designed, wherein the first connection structure of the bus bar can be connected to the first top cover of the first battery cell, the second connection structure of the bus bar can be connected to the second shell of the second battery cell, and the third connection structure of the bus bar is connected to the first connection structure and the second connection structure, so that an electrical connection is formed between the first battery cell and the second battery; and the third connection structure is arranged to form a gap with the first shell to reduce the probability of the third connection structure contacting the first shell, thereby effectively reducing the probability of a short circuit between the third connection structure and the first shell.

[0080] The battery disclosed in the embodiments of the present application can be used as a power source and applied to electrical equipment or as an energy storage element and applied to various energy storage systems. Electrical equipment can be, but is not limited to, mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys can include fixed or mobile electric toys, for example, game consoles, electric car toys, electric ship toys, electric airplane toys, etc., and spacecraft can include airplanes, rockets, space shuttles, spacecraft, etc.

[0081] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device in an embodiment of the present application.

[0082] Please refer to Figure 1 , Figure 1A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0083] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0084] Please refer to Figure 2 , Figure 2 An exploded view of a battery 100 provided in some embodiments of the present application. The battery 100 includes a box 10 and a battery cell 20, and the battery cell 20 is contained in the box 10. Among them, the box 10 is used to provide a storage space for the battery cell 20, and the box 10 can adopt a variety of structures. In some embodiments, the box 10 may include a first part 11 and a second part 12, the first part 11 and the second part 12 cover each other, and the first part 11 and the second part 12 jointly define a storage space for accommodating the battery cell 20. The second part 12 may be a hollow structure with one end open, the first part 11 may be a plate-like structure, and the first part 11 covers the open side of the second part 12, so that the first part 11 and the second part 12 jointly define a storage space; the first part 11 and the second part 12 may also be hollow structures with one side open, and the open side of the first part 11 covers the open side of the second part 12. Of course, the box 10 formed by the first part 11 and the second part 12 may be in a variety of shapes, such as a cylinder, a cuboid, etc.

[0085] In the battery 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a mixed connection. A mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box 10; of course, the battery 100 may also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in a mixed connection, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, and accommodated in the box 10. The battery 100 may also include other structures, for example, the battery 100 may also include a busbar component for realizing electrical connection between the multiple battery cells 20.

[0086] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular or in other shapes. In the present application, the battery cell 20 is described by taking a cylindrical battery cell 20 as an example.

[0087] Please refer to Figure 3 , Figure 3 The schematic diagram of the exploded structure of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 refers to the smallest unit that constitutes the battery. Figure 3 The battery cell 20 includes a top cover sheet 21, a shell 22, an electrode assembly 23 and other functional components.

[0088] The top cover sheet 21 refers to a component that covers the opening of the shell 22 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the top cover sheet 21 can be adapted to the shape of the shell 22 to match the shell 22. Optionally, the top cover sheet 21 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the top cover sheet 21 is not easy to deform when it is squeezed and collided, so that the battery cell 20 can have a higher structural strength and improved reliability. Functional components such as electrode terminals 21a can be provided on the top cover sheet 21. The electrode terminals 21a can be used to electrically connect to the electrode assembly 23 to output or input the electrical energy of the battery cell 20; or, the top cover sheet 21 can also be directly electrically connected to the electrode assembly 23, and directly electrically connected to the outside through the top cover sheet 21 to output or input the electrical energy of the battery cell 20. In some embodiments, the top cover sheet 21 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 20 reaches a threshold. The material of the top cover sheet 21 can also be various, for example, the material of the top cover sheet 21 can be but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member can be further provided on the inner side of the top cover sheet 21, and the insulating member can be used to isolate the electrical connection components in the housing 22 from the top cover sheet 21 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0089] The shell 22 is a component used to cooperate with the top cover sheet 21 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 23, the electrolyte and other components. The shell 22 and the top cover sheet 21 can be independent components, and an opening can be set on the shell 22, and the internal environment of the battery cell 20 is formed by covering the opening with the top cover sheet 21 at the opening. Without limitation, the top cover sheet 21 and the shell 22 can also be integrated. Specifically, the top cover sheet 21 and the shell 22 can form a common connection surface before other components are put into the shell, and when the interior of the shell 22 needs to be encapsulated, the top cover sheet 21 is covered with the shell 22. The shell 22 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 22 can be determined according to the specific shape and size of the electrode assembly 23. The material of the shell 22 can be various, for example, the shell 22 can be but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0090] The electrode assembly 23 is a component in the battery cell 100 where an electrochemical reaction occurs. One or more electrode assemblies 23 may be included in the shell 22. The electrode assembly 23 is mainly formed by winding or stacking the positive electrode sheet and the negative electrode sheet, and a separator is usually provided between the positive electrode sheet and the negative electrode sheet. The parts of the positive electrode sheet and the negative electrode sheet with active materials constitute the main body of the electrode assembly, and the parts of the positive electrode sheet and the negative electrode sheet without active materials each constitute the pole ear 23a. The positive pole ear and the negative pole ear may be located together at one end of the main body or respectively at both ends of the main body. In some embodiments, during the charging and discharging process of the rolling groove structure battery cell, the positive active material and the negative active material react with the electrolyte, and the positive pole ear and the negative pole ear are respectively connected to the shell 22 and the top cover sheet 21 to form a current loop, so that the shell 22 and the top cover sheet 21 are respectively positively charged and negatively charged. Among them, the above-mentioned grooved structure battery cell refers to a battery cell 100 with a bending structure formed by processing the shell 22 with a groove rolling process. At the same time, the shell 22 also forms a flange structure at the opening, and part of the top cover sheet 21 is inserted between the flange structure and the bending structure and is connected and fixed with the shell 22.

[0091] According to some embodiments of the present application, referring to Figures 4 to 6 In a first aspect, an embodiment of the present application provides a battery 100, comprising a busbar 50 and at least one battery cell group 110, wherein the battery cell group 110 comprises a first battery cell 30 and a second battery cell 40 which are adjacently arranged; the first battery cell 30 comprises a first shell 32 and a first top cover sheet 31 which is sealed on the first shell 32, and the second battery cell 40 comprises a second shell 42 and a second top cover sheet 41 which is sealed on the second shell 42; the busbar 50 comprises a first connecting structure 51, a second connecting structure 52, and a third connecting structure 53 which connects the first connecting structure 51 and the second connecting structure 52, wherein the first connecting structure 51 is connected to the first top cover sheet 31, and the second connecting structure 52 is connected to the second shell 42; wherein a gap is formed between the third connecting structure 53 and the first shell 32.

[0092] The battery cell group 110 refers to a combined structure including but not limited to a first battery cell 30 and a second battery cell 40. Exemplarily, the battery cell group 110 may include a first battery cell 30 and a second battery cell 40 arranged adjacent to each other, or the battery cell group 110 may also include one or more other battery cells 20 arranged adjacent to the first battery cell 30 and the second battery cell 40, respectively, and the one or more battery cells 20 may be electrically connected to the first battery cell 30 or the second battery cell 40 through a bus bar 50.

[0093] The number of battery cell groups 110 may be one group, or two or more groups; illustratively, when the number of battery cell groups 110 is two or more groups, adjacent battery cell groups 110 may be electrically connected via busbars 50 .

[0094] The busbar 50 is a conductive structure, such as a metal conductive structure or an alloy conductive structure; the busbar 50 is used as a connector between the first battery cell 30 and the second battery cell 40, and plays the role of current distribution. It can be understood that the busbar 50 can also electrically connect the first battery cell 30 and other battery cells 20, or the second battery cell 40 and other battery cells 20.

[0095] The busbar 50 includes a first connection structure 51, a second connection structure 52 and a third connection structure 53; the first connection structure 51 is connected to the first top cover sheet 31 of the first battery cell 30, and optionally, the first connection structure 51 may be, but is not limited to, a connection block, a connection sheet, a connection ring, a connection rod and other configurations; the first connection structure 51 may be a metal conductive structure (for example, a copper structure, an aluminum structure, a silver structure, a gold structure, etc.) or an alloy conductive structure (for example, a copper-nickel alloy, a copper-tin alloy, a copper-aluminum alloy), etc. Exemplarily, the first connection structure 51 may be a conductive copper ring.

[0096] The second connection structure 52 is connected to the second housing 42 of the second battery cell 40. Optionally, the second connection structure 52 may be, but is not limited to, a connection block, a connection sheet, a connection ring, a connection rod, or other configurations; the second connection structure 52 may be a metal conductive structure (e.g., a copper structure, an aluminum structure, a silver structure, a gold structure, etc.) or an alloy conductive structure (e.g., a copper-nickel alloy, a copper-tin alloy, a copper-aluminum alloy), etc. Exemplarily, the second connection structure 52 may be a conductive copper ring.

[0097] The third connection structure 53 connects the first connection structure 51 and the second connection structure 52. Optionally, the third connection structure 53 may be, but is not limited to, a connection block, a connection sheet, a connection ring, a connection rod, and other configurations; the third connection structure 53 may be a metal conductive structure (e.g., a copper structure, an aluminum structure, a silver structure, a gold structure, etc.) or an alloy conductive structure (e.g., a copper-nickel alloy, a copper-tin alloy, a copper-aluminum alloy), etc. Exemplarily, the third connection structure 53 may be a conductive copper sheet.

[0098] A gap is formed between the third connecting structure 53 and the first shell 32, and the first connecting structure 51 connected to the third connecting structure 53 is connected to the first top cover plate 31. It can be understood that when the third connecting structure 53 is connected to the first connecting structure 51, it can avoid the first shell 32 by bending or the like, so that a gap can be formed between the third connecting structure 53 and the first shell 32.

[0099] Exemplarily, the gap formed between the third connecting structure 53 and the first shell 32 may include the gap formed between the third connecting structure 53 and the end side surface in the axial direction Z of the first shell 32, and the gap formed between the third connecting structure 53 and the peripheral wall surface formed around the axial direction Z of the first shell 32, as well as the gap formed between the intersection between the end side surface in the axial direction Z of the first shell 32 and the peripheral wall surface formed around the axial direction Z and the third connecting structure 53, and may also include the gap formed between the end side surface in the axial direction Z of the first shell 32 and the inner peripheral wall surface formed around the axial direction Z, and the third connecting structure 53.

[0100] The battery 100 provided in the embodiment of the present application is connected to the first top cover sheet 31 by using the first connection structure 51 of the bus bar 50, and is connected to the second shell 42 by using the second connection structure 52, and the first connection structure 51 and the second connection structure 52 are connected through the third connection structure 53 to achieve electrical connection between the adjacent first battery cells 30 and the second battery cells 40, and by forming a gap between the third connection structure 53 and the first shell 32, the risk of short circuit between the third connection structure 53 and the first shell 32 is effectively reduced.

[0101] Please refer to Figures 4 to 6 In some embodiments, in the axial direction Z of the first shell 32, at least part of the first top cover sheet 31 protrudes outside the first shell 32 and forms a height difference with the first shell 32, and the first connecting structure 51 is connected to the part of the first top cover sheet 31 located outside the first shell 32; the third connecting structure 53 includes a main body 531, the main body 531 is bent toward the second shell 42 to form a first bending portion 532, the main body 531 is connected to the first connecting structure 51, and the first bending portion 532 is connected to the second connecting structure 52; gaps are formed between the main body 531 and the first bending portion 532 and the first shell 32 respectively.

[0102] It can be understood that the first battery cell 30 and the second battery cell 40 of the embodiment of the present application are both described by taking cylindrical battery cells as examples. Therefore, the first shell 32 of the first battery cell 30 is a cylindrical shell structure, and the first shell 32 has an axial direction Z.

[0103] In the axial direction Z of the first shell 32, at least part of the first top cover sheet 31 protrudes outside the first shell 32, and the first connection structure 51 is connected to the part of the first top cover sheet 31 outside the first shell 32; therefore, the first connection structure 51 is also outside the first shell 32, and a gap is formed between the first connection structure 51 and the end side surface of the first shell 32 in the axial direction Z of the first shell 32, and the probability of the first connection structure 51 and the first shell 32 forming contact is low. Exemplarily, the first connection structure 51 abuts against the end side surface of the first top cover sheet 31 facing away from the first shell 32.

[0104] The third connection structure 53 includes a main body 531 and a first bending portion 532. The main body 531 may be, but is not limited to, a sheet structure, a block structure, a rod structure, etc. The first bending portion 532 may be formed by bending the main body 531, or the first bending portion 532 may be fixedly connected to the main body 531 by welding, clamping, screwing, etc. to form a whole. Exemplarily, the main body 531 may be a long copper sheet structure, and the first bending portion 532 may be formed by bending the main body 531 toward one end of the second connection structure 52.

[0105] Among them, the main body 531 is connected to the first connecting structure 51, and because the first connecting structure 51 forms a gap with the end side surface of the first shell 32 in the axial direction Z of the first shell 32, after the main body 531 is connected to the first connecting structure 51, the main body 531 also forms a gap with the end side surface of the first shell 32 in the axial direction Z of the first shell 32, that is, the probability of the main body 531 forming contact with the first shell 32 is low.

[0106] It should be understood that in order to meet the circuit arrangement inside the battery 100, when the first battery cell 30 and the second battery cell 40 are arranged, in the axial direction Z of the first shell 32, the opposite ends of the first shell 32 and the second shell 42 should be flush; thus, in the axial direction Z of the first shell 32, a gap will also be formed between the portion of the first top cover sheet 31 located outside the first shell 32 and the end of the second shell 42, and the main body 531 is connected to the portion of the first top cover sheet 31 located outside the first shell 32. Therefore, the end of the main body 531 that is away from the first connecting structure 51 needs to be bent in the axial direction Z and toward the second shell 42 to form a first bending portion 532, so that the main body 531 is connected to the second connecting structure 52 connected to the second shell 42 through the first bending portion 532.

[0107] During the process of bending the main body 531 toward the second shell 42 to form the first bending portion 532, the first bending portion 532 may come into contact with the first shell 32. Therefore, in this embodiment, the first bending portion 532 is configured to form a gap with the first shell 32 to reduce the probability of short circuit between the first bending portion 532 and the first shell 32.

[0108] In this way, the main body 531 and the first bending portion 532 of the third connecting structure 53 form gaps with the first shell 32 respectively, thereby reducing the risk of short circuit between the third connecting structure 53 and the first shell 32, that is, reducing the risk of overlapping short circuit between the bus bar 50 and the first shell 32 and the first top cover plate 31.

[0109] Please refer to Figures 4 to 6 In some embodiments, a gap is formed between the main body 531 and the first shell 32 in the thickness direction of the first top cover sheet 31 ; and a gap is formed between the first bending portion 532 and the first shell 32 in a direction perpendicular to the thickness direction of the first top cover sheet 31 .

[0110] The first top cover piece 31 is covered on the end of the first shell 32 along the axial direction Z. Therefore, the thickness direction of the first top cover piece 31 may be parallel to the axial direction Z of the first shell 32 .

[0111] In this way, a gap is formed between the main body 531 and the first shell 32 along the thickness direction of the first top cover sheet 31, and a gap is formed between the first bent portion 532 and the first shell 32 along a direction perpendicular to the thickness direction of the first top cover sheet 31, so as to reduce the risk of overlapping short circuit between the bus bar 50 and the first shell 32 and the first top cover sheet 31.

[0112] Please refer to Figures 4 to 6 In some embodiments, in the radial direction X of the first shell 32 , the distance between the end of the first bending portion 532 facing the first shell 32 and the first shell 32 is W, the outer diameter of the first shell 32 is R, and 0.05≤W / R<1.

[0113] The end of the first bending portion 532 facing the first shell 32 is the connection point between the first bending portion 532 and the main body 531 , that is, the bending starting point where the third connecting structure 53 is bent to form the first bending portion 532 .

[0114] The distance W between the end of the first bending portion 532 facing the first shell 32 and the first shell 32 is specifically the distance between the end of the first bending portion 532 facing the first shell 32 and the outer peripheral wall surface of the first shell 32 along the radial direction X of the first shell 32 .

[0115] Optionally, the ratio of the distance W between the end of the first bend portion 532 facing the first shell 32 and the first shell 32 to the outer diameter R of the first shell 32 can be any value between 0.05 and 1, including but not limited to 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 0.99, etc.

[0116] In this way, by limiting the ratio of the distance W between the end of the first bending portion 532 toward the first shell 32 and the first shell 32 to the outer diameter R of the first shell 32 to be greater than or equal to 0.05 and less than 1, the position of the end of the first bending portion 532 toward the first shell 32 can be limited, so that a gap can be maintained between the end of the first bending portion 532 toward the first shell 32 and the first shell 32, so as to effectively reduce the risk of short circuit between the first bending portion 532 and the first shell 32.

[0117] Please refer to Figures 4 to 6 , in some embodiments, 0.1≤W / R<0.5.

[0118] In this way, by further limiting the ratio of the distance W between the end of the first bending portion 532 toward the first shell 32 and the first shell 32 to the outer diameter R of the first shell 32 to be greater than or equal to 0.1 and less than 0.5, the position of the end of the first bending portion 532 toward the first shell 32 is further limited, thereby further improving the problem of short circuit between the first bending portion 532 and the first shell 32.

[0119] Please refer to Figures 8 to 11 In some embodiments, in the axial direction Z of the first shell 32, the first top cover sheet 31 is flush with the end of the first shell 32, or the first top cover sheet 31 is arranged within the range of the first shell 32; the third connecting structure 53 includes a main body portion 531, one end of the main body portion 531 is bent toward the first top cover sheet 31 to form a second bending portion 533, and the other end of the main body portion 531 is bent toward the second shell 42 to form a third bending portion 534; the main body portion 531, the second bending portion 533 and the third bending portion 534 respectively form gaps with the first shell 32.

[0120] The third connection structure 53 includes a main body 531, a second bending portion 533 and a third bending portion 534; the main body 531 may be, but not limited to, a sheet structure, a block structure, a rod structure, etc.; the second bending portion 533 may be formed by bending the main body 531, or the first bending portion 532 may be fixedly connected to the main body 531 by welding, clamping, screwing, etc. to form a whole; similarly, the third bending portion 534 may be formed by bending the main body 531, or the third bending portion 534 may be fixedly connected to the main body 531 by welding, clamping, screwing, etc. to form a whole. Exemplarily, the main body 531 may be a long copper sheet structure, the second bending portion 533 may be formed by bending the main body 531 toward one end of the first connection structure 51, and the third bending portion 534 may be formed by bending the main body 531 toward one end of the second connection structure 52.

[0121] It can be understood that in the axial direction Z of the first shell 32, the first top cover sheet 31 is flush with the end of the first shell 32, or when the first top cover sheet 31 is set within the range of the first shell 32, when the third connection structure 53 is connected to the first connection structure 51 connected to the first top cover sheet 31, the third connection structure 53 is easy to form contact with the first top cover sheet 31. Therefore, the main body 531 is configured to form a gap with the end of the first shell 32 in the axial direction Z, and the main body 531 is bent toward the first top cover sheet 31 at one end of the first connection structure 51 and forms a second bending portion 533, so that the main body 531 can be connected to the first connection structure 51 connected to the first top cover sheet 31 through the second bending portion 533; and the second bending portion 533 is configured to form a gap with the first shell 32, so as to effectively reduce the risk of short circuit between the second bending portion 533 and the first shell 32.

[0122] At the same time, since a gap is formed between the main body 531 and the end of the first shell 32 in the axial direction Z, a gap will also be formed between the main body 531 and the end of the second shell 42, and the main body 531 is connected to the portion of the first top cover sheet 31 located outside the first shell 32. Therefore, the end of the main body 531 that is away from the first connecting structure 51 needs to be bent in the axial direction Z and toward the second shell 42 to form a third bending portion 534, so that the main body 531 can be connected to the second connecting structure 52 connected to the second shell 42 through the third bending portion 534.

[0123] In the process of bending the main body 531 toward the second shell 42 to form the third bending portion 534, the third bending portion 534 may come into contact with the first shell 32. Therefore, in this embodiment, the third bending portion 534 is configured to form a gap with the first shell 32 to reduce the probability of short circuit between the third bending portion 534 and the first shell 32.

[0124] In this way, the main body 531, the second bending portion 533 and the third bending portion 534 of the third connecting structure 53 respectively form gaps with the first shell 32, thereby reducing the risk of short circuit between the third connecting structure 53 and the first shell 32, that is, reducing the risk of overlapping short circuit between the bus bar 50 and the first shell 32 and the first top cover plate 31.

[0125] Please refer to Figures 8 to 11 In some embodiments, in the thickness direction of the first top cover sheet 31, a gap is formed between the main body 531 and the first shell 32; in the direction perpendicular to the thickness direction of the first top cover sheet 31, a gap is formed between the second bending portion 533 and the first shell 32, and a gap is formed between the third bending portion 534 and the first shell 32.

[0126] In this way, a gap is formed between the main body 531 and the first shell 32 along the thickness direction of the first top cover sheet 31, and gaps are formed between the second bent portion 533 and the third bent portion 534 and the first shell 32 along a direction perpendicular to the thickness direction of the first top cover sheet 31, respectively, so as to reduce the risk of overlapping short circuit between the bus bar 50 and the first shell 32 and the first top cover sheet 31.

[0127] Please refer to Figures 8 to 11 In some embodiments, in the axial direction Z of the first shell 32 , the distance between the end of the main body 531 facing the first shell 32 and the first shell 32 is H, 0<H≤10mm.

[0128] Optionally, the distance H between the end of the main body 531 facing the first shell 32 and the first shell 32 can be any value between 0 and 10 mm (hereinafter referred to as mm), for example, but not limited to, 1 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, 8 mm, 8.5 mm, 9 mm, 9.5 mm, 10 mm, etc.

[0129] In this way, by limiting the distance H between the end of the main body 531 toward the first shell 32 and the first shell 32 to be greater than 0 and less than or equal to 10 mm, a gap can be formed between the main body 531 and the end of the first shell 32, and the distance of the gap can be limited to reduce the impact on the space occupied by the battery 100.

[0130] Please refer to Figures 8 to 11 , in some embodiments, 1mm≤H≤7mm.

[0131] By configuring in this way, by further limiting the distance H between the end of the main body 531 toward the first shell 32 and the first shell 32, the short circuit problem between the end of the main body 531 and the first shell 32 can be further improved, and the impact on the space occupied inside the battery 100 can be further reduced.

[0132] Please refer to Figures 8 to 11 In some embodiments, in the radial direction X of the first shell 32 , the distance between the end of the third bending portion 534 facing the first shell 32 and the first shell 32 is M, the outer diameter of the first shell 32 is R, and 0.05≤M / R<1.

[0133] The end of the third bending portion 534 facing the first shell 32 is the connection point between the third bending portion 534 and the main body 531 , that is, the bending starting point where the third connecting structure 53 is bent to form the third bending portion 534 .

[0134] The distance W between the end of the third bending portion 534 facing the first shell 32 and the first shell 32 is specifically the distance between the end of the third bending portion 534 facing the first shell 32 and the outer peripheral wall surface of the first shell 32 along the radial direction X of the first shell 32 .

[0135] Optionally, the ratio of the distance W between the end of the third bend portion 534 facing the first shell 32 and the first shell 32 to the outer diameter R of the first shell 32 can be any value between 0.05 and 1, including but not limited to 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 0.99, etc.

[0136] In this way, the ratio of the distance M between the end of the third bending portion 534 facing the first shell 32 and the first shell 32 and the outer diameter R of the first shell 32 is limited to be greater than or equal to 0.05 and less than 1, so that the position of the end of the third bending portion 534 facing the first shell 32 can be limited, so that a gap can be maintained between the end of the third bending portion 534 facing the first shell 32 and the first shell 32, so as to effectively reduce the risk of short circuit between the third bending portion 534 and the first shell 32.

[0137] Please refer to Figures 8 to 11 , in some embodiments, 0.1≤M / R<0.5.

[0138] In this way, by further limiting the ratio of the distance W between the end of the third bending portion 534 toward the first shell 32 and the first shell 32 to the outer diameter R of the third shell to be greater than or equal to 0.1 and less than 0.5, the position of the end of the third bending portion 534 toward the first shell 32 is further limited, thereby further improving the problem of short circuit between the third bending portion 534 and the first shell 32.

[0139] Please refer to Figure 6 and Figure 7 , or refer to Fig. 9 or Fig.10 In some embodiments, an insulating structure (not shown in the figure) is provided in the gap between the third connecting structure 53 and the first shell 32 .

[0140] Optionally, the insulating structure includes but is not limited to insulating glue, insulating coating, insulating gasket, insulating sticker, insulating sleeve, etc. The insulating structure can be arranged on the surface of the third connecting structure 53, for example, fixed on the third connecting structure 53 by bonding, coating, sleeve, etc.; or, the insulating structure can be arranged on the surface of the first shell 32, for example, it can be arranged on the outer surface of the end of the first shell 32 in the axial direction Z, or it can be arranged on the outer peripheral side of the first shell 32, or it can completely cover the entire outer surface of the first shell 32.

[0141] In this way, on the basis of forming a gap between the third connection structure 53 and the first shell 32 , an insulating structure is provided in the gap, which can further reduce the probability of short circuit between the third connection structure 53 and the first shell 32 .

[0142] Please refer to Figure 4 or Fig. 9 or Fig.11 In some embodiments, the second connection structure 52 is connected to the end side surface of the second shell 42; and / or, the second connection structure 52 is connected to the peripheral side surface of the second shell 42.

[0143] It should be understood that the end side surface of the second shell 42 refers to the wall surface of the end side of the second shell 42 in the axial direction Z and on the same side as the second top cover plate 41; the peripheral side surface of the second shell 42 refers to the peripheral wall surface formed by the second shell 42 around the axial direction Z.

[0144] The second connection structure 52 is used to connect to the second shell 42 of the second battery cell 40. Optionally, the second connection structure 52 can be connected to the end side surface of the second shell 42; or, the second connection structure 52 can be connected to the peripheral side surface of the second shell 42; or, the second connection structure 52 can be connected to the end side surface and the peripheral side surface of the second shell 42 at the same time.

[0145] In this way, the second connection structure 52 can be connected to both the end side and the peripheral side of the second shell 42. The second connection structure 52 can also be connected to both the end side and the peripheral side of the second shell 42 at the same time to achieve electrical connection between the first battery cell 30 and the second battery cell 40.

[0146] Please refer to Figure 6 and Figure 7 ,or Fig. 9 and Fig.10 In some embodiments, the first connection structure 51 is a ring-shaped structure.

[0147] Optionally, the first connection structure 51 may be, but is not limited to, a circular ring structure, a polygonal ring structure (such as a rectangular ring, a triangular ring, a hexagonal ring, etc.) or a special-shaped ring structure, etc.

[0148] In this configuration, since the first top cover sheet 31 is also provided with components such as a pressure relief mechanism, when the first connecting structure 51 having an annular structure is connected to the first top cover sheet 31 , structural components such as the pressure relief mechanism on the top cover sheet can be avoided.

[0149] Please refer to Figure 6 and Figure 7 ,or Fig. 9 and Fig.10 In some embodiments, the first connection structure 51 is a circular ring structure, the outer diameter of the first connection structure 51 is J, the outer diameter of the first shell 32 is R, and 0.1<J / R<0.9.

[0150] Optionally, the ratio of the outer diameter J of the first connecting structure 51 to the outer diameter R of the first shell 32 can be any value between 0.1 and 0.9, for example, but not limited to, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, 0.5, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, etc.

[0151] In this way, by limiting the ratio of the outer diameter J of the first connecting structure 51 and the outer diameter R of the first shell 32 to be greater than 0.1 and less than 0.9, the size of the first connecting structure 51 relative to the first shell 32 can be limited so that the first connecting structure 51 can form an electrical connection with the first top cover plate 31.

[0152] Please refer to Figure 6 and Figure 7 ,or Fig. 9 and Fig.10 , in some embodiments, 0.3≤J / R≤0.8.

[0153] In this way, by further limiting the ratio of the outer diameter J of the first connecting structure 51 and the outer diameter R of the first shell 32 to be greater than or equal to 0.3 and less than or equal to 0.8, the size of the first connecting structure 51 relative to the first shell 32 is further limited, thereby improving the connection effect between the first connecting structure 51 and the first top cover plate 31.

[0154] Please refer to Figures 5 to 7 ,or Figures 8 to 10 In some embodiments, the second connection structure 52 is an annular structure, and a avoidance opening 521 is opened on the second connection structure 52 .

[0155] Optionally, the second connection structure 52 may be, but is not limited to, a circular ring structure, a polygonal ring structure (such as a rectangular ring, a triangular ring, a hexagonal ring, etc.) or a special-shaped ring structure, etc. The second connection structure 52 may be consistent with or inconsistent with the first connection structure 51 in appearance.

[0156] Among them, an avoidance opening 521 is opened on the second connection structure 52. Therefore, when the battery cell group 110 also includes other battery cells 20, the other battery cells 20 can be connected to the first battery cell 30 or the second battery cell 40, and the avoidance opening 521 of one bus bar 50 can avoid the third connection structure 53 of another adjacent bus bar 50.

[0157] In this way, the second connection structure 52 in an annular structure can be connected to the end face of the second shell 42, and can also be sleeved and connected to the peripheral side surface of the second shell 42; and, when the number of bus bars 50 used is two or more, the avoidance opening 521 of one bus bar 50 can avoid the third connection portion of another adjacent bus bar 50, effectively reducing the probability of short circuit between the two adjacent bus bars 50.

[0158] Please refer to Figures 5 to 7 ,or Figures 8 to 10 In some embodiments, the third connection structure 53 has an extension direction S, and in a direction perpendicular to the extension direction S, gaps are formed between the third connection structure 53 and two opposite ends of the avoidance opening 521 .

[0159] It can be understood that in the extension direction S of the third connection structure 53, the opposite ends of the third connection structure 53 are respectively connected to the first connection structure 51 and the second connection structure 52. It should be understood that the extension direction S of the third connection structure 53 should be consistent with the arrangement direction of the battery cells 20 in the battery cell group 110, so that the first connection structure 51 and the second connection structure 52 can be connected to the corresponding first top cover sheet 31 and the second shell 42.

[0160] When the battery cell group 110 also includes other battery cells 20, when the other battery cells 20 need to be electrically connected to the second battery cell 40, a busbar 50 is needed to connect the other battery cells 20 with the second battery cell 40; the first connection structure 51 of the busbar 50 (i.e., the busbar 50 connecting the second battery cell 40 with the other battery cells 20) is connected to the second top cover sheet 41, and at this time, the first connection structure 51 of the busbar 50 will be within the circular range of the second connection structure 52 of the adjacent busbar 50 (i.e., the busbar 50 connecting the first battery cell 30 with the first battery cell 30), and the third connection structure 53 of the busbar 50 will be passed through the avoidance opening 521 of the second connection structure 52 of the adjacent busbar 50.

[0161] With such a configuration, when two or more busbars 50 are used, the avoidance opening 521 opened on one of the busbars 50 can avoid the third connection structure 53 of another adjacent busbar 50, thereby reducing the probability of short circuit between the two adjacent busbars 50.

[0162] Please refer to Figures 5 to 7 ,or Figures 8 to 10 In some embodiments, in a direction perpendicular to the extension direction S, a spacing D and a spacing F are formed between the third connection structure 53 and the two opposite ends of the avoidance opening 521, respectively, wherein 0<D≤10mm, 0<F≤10mm.

[0163] It can be understood that when the battery cell group 110 includes the first battery cell 30, the second battery cell 40 and at least one other battery cell 20, at least two busbars 50 are required to connect the first battery cell 30 and the second battery cell 40, and the first battery cell 30 or the second battery cell 40 and the other battery cells 20. Therefore, when the third connection structure 53 of one of the busbars 50 is inserted into the avoidance opening 521 of the second connection structure 52 of another adjacent busbar 50, a spacing D and a spacing F will also be formed between the opposite ends of the third connection structure 53 of one of the busbars 50 and the avoidance opening 521 of the second connection structure 52 of another adjacent busbar 50.

[0164] In this way, by limiting the distance D and the distance F respectively formed between the opposite ends of the third connecting structure 53 and the avoidance opening 521 to be greater than 0 and less than or equal to 10 mm, it is possible to form a sufficient gap between two adjacent bus bars 50 (i.e., between the opposite ends of the third connecting structure 53 of one bus bar 50 and the avoidance opening 521 of the second connecting structure 52 of another adjacent bus bar 50) when two or more bus bars 50 are required, thereby reducing the probability of short circuit.

[0165] Please refer to Figure 6 and Figure 7 ,or Fig. 9 and Fig.10 In some embodiments, the second connection structure 52 is a circular ring structure, the outer diameter of the second connection structure 52 is K, the outer diameter of the second shell 42 is L, and 0.5<K / L≤1.2.

[0166] Optionally, the ratio of the outer diameter K of the second connecting structure 52 to the outer diameter L of the first shell 32 can be any value between 0.5 and 1.2, for example, but not limited to, 0.55, 0.6, 0.65, 0.7, 0.75, 0.8, 0.85, 0.9, 0.95, 1.0, 1.05, 1.1, 1.15, 1.2, etc.

[0167] In this way, by limiting the ratio of the outer diameter K of the second connecting structure 52 to the outer diameter L of the second shell 42 to be greater than 0.5 and less than or equal to 1.2, the size of the second connecting structure 52 relative to the second shell 42 can be limited so that the second connecting structure 52 can form an electrical connection with the second shell 42.

[0168] Please refer to Figure 6 and Figure 7 ,or Fig. 9 and Fig.10 , in some embodiments, 0.8≤K / L≤1.2.

[0169] In this way, by further limiting the ratio of the outer diameter K of the second connecting structure 52 to the outer diameter L of the second shell 42 to be greater than or equal to 0.8 and less than or equal to 1.2, the size of the second connecting structure 52 relative to the second shell 42 is further limited, thereby improving the connection effect between the second connecting structure and the second shell 42.

[0170] Please refer to Figure 4 , Figure 6 , Fig. 9 , Fig.11 and Fig.12 In some embodiments, in the axial direction Z of the first shell 32, the first top cover sheet 31 and the second top cover sheet 41 are arranged on the same side; or, in the axial direction Z of the first shell 32, the first top cover sheet 31 and the second top cover sheet 41 are respectively arranged on opposite sides.

[0171] It can be understood that when the first top cover sheet 31 and the second top cover sheet 41 are arranged on the same side or the first top cover sheet 31 and the second top cover sheet 41 are respectively arranged on opposite sides, the electrical connection between the first battery cell 30 and the second battery cell 40 can be achieved by connecting to the first top cover sheet 31 through the first connecting structure 51, connecting to the second shell 42 through the second connecting structure 52, and connecting the first connecting structure 51 and the second connecting structure 52 through the third connecting structure 53.

[0172] For example, in some specific embodiments, the battery cell group 110 includes a first battery cell 30, a second battery cell 40 and other battery cells 20, wherein one busbar 50 connects the first top cover sheet 31 and the second shell 42 on one side of the first shell 32 in the axial direction Z, and another busbar 50 connects the second top cover 41 and the shell 22 of the other battery cells 20 on the other side of the first shell 32 in the axial direction Z; specifically, Fig.12 shown.

[0173] Below, the battery 100 of the present application is described by taking a grooved battery cell as an example and combining with specific implementations.

[0174] Please refer to Figures 4 to 12 The battery 100 includes a busbar 50 and at least one battery cell group 110, and the battery cell group 110 includes a first battery cell 30 and a second battery cell 40. The busbar 50 includes a first connection structure 51, a second connection structure 52 and a third connection structure 53. The first connection structure 51 can be a circular conductive sheet, and the first connection structure 51 is connected to the end surface of the first top cover sheet 31 of the first battery cell 30 that faces away from the first shell 32; the second connection structure 52 can be a circular conductive sheet, and a avoidance opening 521 is provided on the second connection structure 52. The second connection structure 52 is connected to the second shell 42 of the second battery cell 40, for example, it can be connected to the second shell 42 on its axial end side surface, or on the peripheral side surface of the second shell 42.

[0175] In the axial direction Z of the first shell 32, when at least part of the first top cover sheet 31 protrudes outside the first shell 32, the third connecting structure 53 includes a main body 531 and a first bending portion 532; the main body 531 is connected to the portion of the first top cover sheet 31 located outside the first shell 32, so that a gap is formed between the main body 531 and the end surface of the first shell 32 in the axial direction Z; the first bending portion 532 is bent toward the second shell 42 and connected to the second connecting structure 52, so that a gap is formed between the end of the first bending portion 532 toward the first shell 32 and the first shell 32.

[0176] In the axial direction Z of the first shell 32, the first top cover sheet 31 is flush with the end of the first shell 32, or, when the first top cover sheet 31 is arranged within the range of the first shell 32, the third connecting structure 53 includes a main body 531, a second bending portion 533 and a third bending portion 534; the main body 531 forms a gap with the first shell 32 in the axial direction Z of the first shell 32, one end of the main body 531 is bent toward the first top cover sheet 31 to form the second bending portion 533, and is connected to the first connecting structure 51 through the second bending portion 533, and a gap is formed between the second bending portion 533 and the first shell 32; the other end of the main body 531 is bent toward the second shell 42 to form the third bending portion 534, the third bending portion 534 is connected to the second connecting structure 52, and the third bending portion 534 faces the end of the first shell 32 to form a gap with the first shell 32.

[0177] Please refer to Figures 1 to 4 In a second aspect, an embodiment of the present application further provides an electrical device, including the battery 100 as described above, and the battery 100 is used to provide electrical energy.

[0178] The electrical equipment provided in the embodiment of the present application is, for example, the above-mentioned vehicle 1000. The electrical equipment includes the above-mentioned battery 100. When the probability of short-circuiting the busbar 50 of the above-mentioned battery 100 is low, the operation of the electrical equipment is more stable.

[0179] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A battery, characterized in that: include At least one battery cell group, the battery cell group comprising a first battery cell and a second battery cell arranged adjacent to each other; the first battery cell comprising a first shell and a first top cover sheet covering the first shell, and the second battery cell comprising a second shell and a second top cover sheet covering the second shell; as well as A busbar, the busbar comprising a first connecting structure, a second connecting structure, and a third connecting structure connecting the first connecting structure and the second connecting structure, the first connecting structure being connected to the first top cover sheet, the second connecting structure being connected to the second shell; wherein a gap is formed between the third connecting structure and the first shell.

2. The battery according to claim 1, characterized in that: In the axial direction of the first shell, at least a portion of the first top cover sheet protrudes outside the first shell and forms a height difference with the first shell, and the first connecting structure is connected to a portion of the first top cover sheet located outside the first shell; The third connection structure includes a main body, which is bent toward the second shell to form a first bending portion, the main body is connected to the first connection structure, and the first bending portion is connected to the second connection structure; gaps are formed between the main body and the first bending portion and the first shell respectively.

3. The battery according to claim 2, characterized in that: In the thickness direction of the first top cover sheet, a gap is formed between the main body and the first shell; In a direction perpendicular to the thickness direction of the first top cover sheet, a gap is formed between the first bent portion and the first shell.

4. The battery according to claim 2, characterized in that: In the radial direction of the first shell, a distance between an end of the first bent portion facing the first shell and the first shell is W, an outer diameter of the first shell is R, and 0.05≤W / R<1.

5. The battery according to claim 4, characterized in that: 0.1≤W / R<0.

5.

6. The battery according to claim 1, characterized in that: In the axial direction of the first shell, the first top cover sheet is flush with the end of the first shell, or the first top cover sheet is arranged within the range of the first shell; The third connection structure includes a main body, one end of which is bent toward the first top cover sheet to form a second bending portion, and the other end of the main body is bent toward the second shell to form a third bending portion; the main body, the second bending portion and the third bending portion respectively form gaps with the first shell.

7. The battery according to claim 6, characterized in that: In the thickness direction of the first top cover sheet, a gap is formed between the main body and the first shell; In a direction perpendicular to the thickness direction of the first top cover sheet, a gap is formed between the second bent portion and the first shell, and a gap is formed between the third bent portion and the first shell.

8. The battery according to claim 6, characterized in that: In the axial direction of the first shell, a distance between an end of the main body portion facing the first shell and the first shell is H, and 0<H≤10 mm.

9. The battery according to claim 8, characterized in that: 1mm≤H≤7mm.

10. The battery according to claim 6, characterized in that: In the radial direction of the first shell, the distance between the end of the third bent portion facing the first shell and the first shell is M, the outer diameter of the first shell is R, and 0.05≤M / R<1.

11. The battery according to claim 10, characterized in that: 0.1≤M / R<0.

5.

12. The battery according to any one of claims 1 to 11, characterized in that: An insulating structure is disposed in a gap between the third connecting structure and the first shell.

13. The battery according to any one of claims 1 to 11, characterized in that: The second connection structure is connected to an end side surface of the second shell; and / or the second connection structure is connected to a peripheral side surface of the second shell.

14. The battery according to any one of claims 1 to 11, characterized in that: The first connection structure is a ring structure.

15. The battery according to claim 14, characterized in that: The first connection structure is a circular ring structure, the outer diameter of the first connection structure is J, the outer diameter of the first shell is R, and 0.1<J / R<0.

9.

16. The battery according to claim 15, characterized in that: 0.3≤J / R≤0.

8.

17. The battery according to any one of claims 1 to 11, characterized in that: The second connection structure is an annular structure, and an escape opening is provided on the second connection structure.

18. The battery according to claim 17, characterized in that: The third connection structure has an extension direction, and in a direction perpendicular to the extension direction, gaps are formed between the third connection structure and two opposite ends of the avoidance opening.

19. The battery according to claim 18, characterized in that: In a direction perpendicular to the extending direction, a distance D and a distance F are respectively formed between the third connecting structure and two opposite ends of the avoidance opening, wherein 0<D≤10mm, 0<F≤10mm.

20. The battery according to claim 17, characterized in that: The second connection structure is a circular ring structure, the outer diameter of the second connection structure is K, the outer diameter of the second shell is L, and 0.5<K / L≤1.

2.

21. The battery according to claim 20, characterized in that: 0.8≤K / L≤1.

2.

22. The battery according to any one of claims 1 to 11, characterized in that: In the axial direction of the first shell, the first top cover sheet and the second top cover sheet are arranged on the same side; or, in the axial direction of the first shell, the first top cover sheet and the second top cover sheet are respectively arranged on two opposite sides.

23. An electrical equipment, characterized in that: A battery according to any one of claims 1 to 22, wherein the battery is used to provide electrical energy.

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