Battery monomer, battery and electric equipment

Abstract

The embodiment of the utility model provides a battery monomer, a battery and electric equipment, the battery monomer comprises a shell and a cover plate, the shell is provided with an opening, and the cover plate is used for closing the opening; wherein the cover plate comprises a first main body and a first turnup, the shell comprises a second main body and a second turnup, and the first turnup is bent relative to the first main body, so that the space occupied by the first turnup is smaller, the energy density of the battery formed by the battery monomers is higher, and a larger space can be reserved for other parts in the battery; and the second flange is connected with the first flange, so that the connection reliability between the shell and the cover plate is higher, the sealing effect is better, and the risk of liquid leakage of the single battery is reduced.

Description

Technical Field

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

[0002] Energy conservation and emission reduction are the key to the sustainable development of the automobile industry. Electric vehicles have become an important part of the sustainable development of the automobile industry due to their advantages in energy conservation and environmental protection. For electric vehicles, battery technology is an important factor in their development.

[0003] In battery technology, how to improve the energy density of batteries is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The embodiments of the present application provide a battery cell, a battery and an electrical device, which can improve the energy density of the battery.

[0005] In a first aspect, the present application provides a battery cell, comprising a shell and a cover plate, wherein the shell has an opening, and the cover plate is used to close the opening; wherein the cover plate comprises a first main body and a first flange, and the shell comprises a second main body and a second flange, wherein the first flange is bent relative to the first main body, and the second flange is connected to the first flange.

[0006] In the above technical solution, the battery cell includes a shell and a cover plate, the shell has an opening, and the cover plate is used to close the opening, so that the shell and the cover plate can jointly form a closed accommodating space for accommodating devices such as electrode assemblies, and the shell and the cover plate can play a role in protecting and dustproofing devices such as electrode assemblies; the cover plate includes a first main body and a first flange, and the shell includes a second main body and a second flange. Compared with the currently straight flange, the first flange is bent relative to the first main body, which can make the space occupied by the first flange smaller, so that the energy density of the battery composed of such battery cells is higher, and more space can be reserved for other components in the battery; the second flange is connected to the first flange, which can make the connection reliability between the shell and the cover plate higher, the sealing effect is better, and the risk of leakage of the battery cell is reduced.

[0007] According to some embodiments of the present application, the first flange protrudes from a side of the first body facing away from the second body.

[0008] In the above technical solution, the first flange protrudes from the side of the first body facing away from the second body, so that when multiple battery cells are assembled, the first flange can be positioned in cooperation with the second body of the adjacent battery cell, thereby facilitating the assembly of multiple battery cells.

[0009] According to some embodiments of the present application, the first flange includes a first curved portion and a first straight portion, the first curved portion is connected to the first body, the first straight portion extends from the first curved portion along a first direction away from one end of the first body, and the first direction intersects with an outer surface of the first body.

[0010] In the above technical solution, the first flange includes a first curved portion and a first straight portion, the first curved portion is connected to the first main body, so as to facilitate the bending and forming of the first flange; the first straight portion extends from the end of the first curved portion away from the first main body along a first direction, and the first direction intersects with the outer surface of the first main body, so as to facilitate the coordination and positioning of the first flange with the second main body of the adjacent battery cell.

[0011] According to some embodiments of the present application, the first direction is perpendicular to the outer surface of the first body.

[0012] In the above technical solution, the first direction is perpendicular to the outer surface of the first body, so that the first straight portion can abut against the second body of the adjacent battery cell to better achieve the matching positioning with the second body of the adjacent battery cell.

[0013] According to some embodiments of the present application, the second flange includes a second curved portion and a second straight portion, the second curved portion is connected to the second main body, and the second straight portion extends from one end of the second curved portion away from the second main body along the first direction; the first curved portion is connected to the second curved portion, and the first straight portion is connected to the second straight portion.

[0014] In the above technical solution, the second flange includes a second curved portion and a second straight portion, the second curved portion is connected to the second main body, which is convenient for bending and forming the second flange; the second straight portion extends along the first direction from one end of the second curved portion away from the second main body; the first curved portion is connected to the second curved portion, and the first straight portion is connected to the second straight portion, which can make the connection between the first flange and the second flange tighter, the connection strength is higher, the sealing is better, and the risk of battery cell leakage is reduced.

[0015] According to some embodiments of the present application, along the first direction, the length of the first straight portion is greater than the length of the second straight portion.

[0016] In the above technical solution, along the first direction, the length of the first straight portion is greater than that of the second straight portion, which can facilitate the connection between the first straight portion and the second body of the adjacent battery cell and also facilitate the connection between the first straight portion and the second straight portion.

[0017] According to some embodiments of the present application, the shell and the cover plate form an outer shell, and the outer surface of the first body is the outer surface of the outer shell with the largest area.

[0018] In the above technical solution, the outer surface of the first main body is the outer surface with the largest area of ​​the shell, so that when the first main body of the battery cell is connected to the second main body of the adjacent battery cell, the first flange can cooperate with the second main body of the adjacent battery cell to position, the arrangement of multiple battery cells is more compact, and the energy density of the battery is higher.

[0019] In a second aspect, the present application provides a battery, comprising a plurality of battery cells as described above, wherein the plurality of battery cells are stacked along a thickness direction of the first body.

[0020] According to some embodiments of the present application, the cover plate includes two first flanges, and along the second direction, the two first flanges are respectively arranged at both ends of the first main body; the multiple battery cells include adjacent first battery cells and second battery cells; along the second direction, at least a portion of the second main body of the first battery cell is located between the two first flanges of the second battery cell and abuts against the two first flanges; the second direction is perpendicular to the thickness direction of the first main body.

[0021] In the above technical solution, the cover plate includes two first flanges, and along the second direction, the two first flanges are respectively arranged at both ends of the first main body; along the second direction, at least a part of the second main body of the first battery cell is located between the two first flanges of the second battery cell, and abuts against the two first flanges, which can make the assembly positioning of the first battery cell and the second battery cell more accurate and the connection between the first battery cell and the second battery cell more stable.

[0022] According to some embodiments of the present application, the second body of the first battery cell is welded or bonded to the first flange of the second battery cell.

[0023] In the above technical solution, the second body of the first battery cell is welded or bonded to the first flange of the second battery cell, which can make the connection between the first battery cell and the second battery cell more stable and more reliable.

[0024] According to some embodiments of the present application, the battery further includes a box body, the box body includes a bottom wall, the bottom wall is used to support the plurality of battery cells, and the second direction is parallel to a thickness direction of the bottom wall.

[0025] In the above technical solution, the battery also includes a box body, which includes a bottom wall, and the bottom wall is used to support multiple battery cells. The second direction is parallel to the thickness direction of the bottom wall, so that the first flange can be connected to the bottom wall, which is convenient for the arrangement and assembly of multiple battery cells in the box body.

[0026] According to some embodiments of the present application, each of the battery cells further includes a first electrode terminal and a second electrode terminal, and the first electrode terminal and the second electrode terminal are protruded from the first body; the plurality of battery cells include adjacent first battery cells and second battery cells; the battery further includes a bus bar, and the bus bar connects the first electrode terminal of the first battery cell and the second electrode terminal of the second battery cell.

[0027] In the above technical solution, each battery cell also includes a first electrode terminal and a second electrode terminal, and the first electrode terminal and the second electrode terminal are protruded from the first body to facilitate electrical connection between multiple battery cells through the first electrode terminal and the second electrode terminal; the battery also includes a busbar, which connects the first electrode terminal of the first battery cell and the second electrode terminal of the second battery cell, thereby realizing electrical connection between the first battery cell and the second battery cell.

[0028] According to some embodiments of the present application, the first battery cell is provided with a notch, the notch penetrates the first battery cell along the thickness direction of the first body, and at least a portion of the busbar is accommodated in the notch.

[0029] In the above technical solution, the busbar can pass through the first battery cell to connect the first electrode terminal of the first battery cell and the second electrode terminal of the second battery cell, and the size of the portion of the busbar protruding from the outer surface of the first battery cell can be reduced, thereby reducing the possibility of deformation or damage of the busbar when the battery is subjected to force, thereby reducing the possibility of short circuit, open circuit or even thermal runaway of multiple battery cells.

[0030] According to some embodiments of the present application, along the second direction, the busbar does not extend beyond the outer surface of the first battery cell; along the third direction, the busbar does not extend beyond the outer surface of the first battery cell; the thickness direction of the first body, the second direction, and the third direction are perpendicular to each other.

[0031] In the above technical solution, along the second direction, the busbar does not extend beyond the outer surface of the first battery cell; along the third direction, the busbar does not extend beyond the outer surface of the first battery cell, so that when the battery cell is subjected to external force in the second direction or the third direction, the external force is not easy to act directly on the busbar, thereby reducing the possibility of deformation or damage of the busbar causing short circuit, open circuit or even thermal runaway of multiple battery cells.

[0032] According to some embodiments of the present application, the battery further includes a box body and an adhesive component, at least part of the plurality of battery cells are accommodated in the box body, and the adhesive component is disposed between the second flange and the box body.

[0033] In the above technical solution, the battery also includes a box and an adhesive, and at least part of the multiple battery cells are accommodated in the box. The adhesive is arranged between the second flange and the box, which can make the connection between the battery cell and the box more stable, the connection reliability is higher, the position of the battery cell in the box is more stable, and the battery cell is not easy to collide with the box and cause damage.

[0034] In a third aspect, the present application provides an electrical device, comprising a battery as described above, wherein the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0036] Figure 1 is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0037] Figure 2 is a schematic diagram of an exploded structure of a battery provided in some embodiments of the present application;

[0038] Figure 3 is a schematic diagram of a three-dimensional structure of a partial structure of a battery provided in some embodiments of the present application;

[0039] Figure 4 is a schematic diagram of a three-dimensional structure of a battery cell provided in some embodiments of the present application from one perspective;

[0040] Figure 5 is a schematic diagram of an exploded structure of a first battery cell provided in some embodiments of the present application;

[0041] Figure 6 is a schematic diagram of a three-dimensional structure of a battery cell from another perspective provided in some embodiments of the present application;

[0042] Figure 7 yes Figure 5 A schematic diagram of a partially enlarged three-dimensional structure of a battery cell at A;

[0043] Figure 8 is a structural schematic diagram of a partially enlarged perspective of a battery cell provided in some embodiments of the present application;

[0044] Fig. 9 is a schematic diagram of the three-dimensional structure of a busbar provided in some embodiments of the present application;

[0045] Fig.10It is a schematic diagram of the three-dimensional structure of a first battery cell provided in some embodiments of the present application.

[0046] Icon: 1000-vehicle; 100-battery; 10-box; 110-first sub-box; 111-bottom wall; 120-second sub-box; 20-battery cell; 21-first battery cell; 201-notch; 22-second battery cell; 20a-housing; 210-housing; 211-second body; 2111-first wall; 2112-second wall; 2113-third wall; 212-second flange; 2121-second bend; 2122 -second straight portion; 220-cover plate; 221-first main body; 222-first flange; 2221-first curved portion; 2222-first straight portion; 230-first electrode terminal; 231-end face; 232-side face; 240-second electrode terminal; 30-bus; 310-bus; 320-first connecting portion; 330-second connecting portion; 200-controller; 300-motor; X-first direction; Y-second direction; Z-third direction. DETAILED DESCRIPTION

[0047] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0048] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0049] The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0050] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0051] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0052] The term "plurality" used in the present application refers to two or more (including two).

[0053] In the present application, the battery cell may include a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, etc., which is not limited in the present embodiment. The battery cell may be flat, rectangular or in other shapes, etc., which is not limited in the present embodiment.

[0054] The battery mentioned in the embodiments of the present application refers to a single physical module including multiple battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery may also generally include a box for encapsulating one or more battery cells or multiple battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0055] The battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector, and the current collector not coated with the positive electrode active material layer serves as the positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode collector can be aluminum, and the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector, and the current collector not coated with the negative electrode active material layer serves as the negative electrode tab. The material of the negative electrode collector can be copper, and the negative electrode active material can be carbon or silicon, etc. In order to ensure that a large current is passed without melting, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the isolation film can be PP (polypropylene) or PE (polyethylene).

[0056] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today. With the development of the new energy industry, batteries are gradually moving towards large-scale and integrated development.

[0057] A battery cell usually includes a shell and a cover plate, which can together form a storage space for accommodating an electrode assembly. After the electrode assembly is installed in the shell, the cover plate needs to be connected to the shell. By setting a flange on the cover plate, it is easy to position the cover plate and the shell, and then to weld the cover plate and the shell, which can improve the preparation efficiency of the battery cell. However, the flange set on the cover plate is generally parallel to the main body of the cover plate. After the battery box is installed, it will occupy a large space in the box, affecting the energy density of the battery. Since the shell is not set with a flange, the welding area with the cover plate is small, which easily leads to low reliability of the connection between the shell and the cover plate, poor sealing effect, and a greater risk of leakage of the battery cell.

[0058] Based on the above considerations, the present application provides a battery cell, which includes a shell and a cover plate, the shell has an opening, and the cover plate is used to close the opening; wherein the cover plate includes a first main body and a first flange, the shell includes a second main body and a second flange, the first flange is bent relative to the first main body, and the second flange is connected to the first flange.

[0059] In the technical solution of the present application, the battery cell includes a shell and a cover plate, the shell has an opening, and the cover plate is used to close the opening, so that the shell and the cover plate can jointly form a closed accommodating space for accommodating devices such as electrode assemblies, and the shell and the cover plate can protect and prevent dust from the devices such as electrode assemblies; the cover plate includes a first main body and a first flange, and the shell includes a second main body and a second flange. Compared with the currently straight flange, the first flange is bent relative to the first main body, which can make the space occupied by the first flange smaller, so that the energy density of the battery composed of such battery cells is higher, and more space can be reserved for other components in the battery; the second flange is connected to the first flange, which can make the connection reliability between the shell and the cover plate higher, the sealing effect is better, and the risk of leakage of the battery cell is reduced.

[0060] The battery disclosed in the embodiment of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft. The battery disclosed in the present application can be used to form a power supply system of the electrical device.

[0061] The present application embodiment provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, an electric tool, a battery vehicle, an electric car, a ship, a spacecraft, etc. The spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0062] The battery described in the embodiments of the present application is not limited to the electrical devices described above, but can also be applied to all electrical devices using batteries. However, for the sake of simplicity, the following embodiments are described using an electrical device such as a vehicle as an example.

[0063] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. 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.

[0064] 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.

[0065] Please refer to Figure 2 , Figure 2 Schematic diagram of the exploded structure of the battery 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 accommodated 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 sub-box 110 and a second sub-box 120, the first sub-box 110 and the second sub-box 120 cover each other, and the first sub-box 110 and the second sub-box 120 jointly define a storage space for accommodating the battery cell 20. The first sub-box 110 may be a hollow structure with one end open, and the second sub-box 120 may be a plate-like structure, and the second sub-box 120 covers the open side of the first sub-box 110, so that the first sub-box 110 and the second sub-box 120 jointly define a storage space; the first sub-box 110 and the second sub-box 120 may also be hollow structures both with one side open, and the open side of the second sub-box 120 covers the open side of the first sub-box 110.

[0066] In some embodiments, the box body 10 may be a rectangular parallelepiped.

[0067] In other embodiments, the box body 10 may also be a cylinder.

[0068] In some embodiments, the box body 10 may be made of aluminum, aluminum alloy or other metal materials, so that the box body 10 has a higher force-bearing performance.

[0069] In other embodiments, the box body 10 may also be made of non-metallic materials with relatively high strength, such as carbon fiber, hard plastic, etc.

[0070] Please refer to Figures 3 to 5 , Figure 3 A schematic diagram of a three-dimensional structure of a partial structure of a battery provided in some embodiments of the present application, Figure 4 A schematic diagram of a three-dimensional structure of a battery cell from one perspective provided in some embodiments of the present application. Figure 5 A schematic diagram of the explosion structure of a first battery cell provided in some embodiments of the present application.

[0071] The embodiment of the present application provides a battery cell 20 , which includes a shell 210 and a cover plate 220 . The shell 210 has an opening, and the cover plate 220 is used to close the opening.

[0072] The cover plate 220 includes a first body 221 and a first flange 222 , the housing 210 includes a second body 211 and a second flange 212 , the first flange 222 is bent relative to the first body 221 , and the second flange 212 is connected to the first flange 222 .

[0073] In some embodiments, the battery cell 20 may be in the form of a rectangular parallelepiped, so that a plurality of battery cells 20 can be closely arranged in a matrix, which is beneficial to improving the energy density of the battery 100 .

[0074] In other embodiments, the battery cell 20 may also be in a flat body, a cylinder, or other shapes.

[0075] In some embodiments, the housing 210 and the cover plate 220 may be made of aluminum, aluminum alloy, or other metal materials, which can enable the battery cell 20 to have higher stress resistance.

[0076] The battery cell includes a shell 210 and a cover plate 220. The shell 210 has an opening. The cover plate 220 is used to close the opening, so that the shell 210 and the cover plate 220 can form a closed accommodation space together for accommodating devices such as electrode assemblies. The shell 210 and the cover plate 220 can protect and prevent dust from the devices such as electrode assemblies. The cover plate 220 includes a first main body 221 and a first flange 222. The shell 210 includes a second main body 211 and a second flange 212. Compared with the flange that is currently set straight, the first flange 222 is bent relative to the first main body 221, which can make the space occupied by the first flange 222 smaller, so that the energy density of the battery composed of such a battery cell is higher, and more space can be reserved for other components in the battery. The second flange 212 is connected to the first flange 222, which can make the connection reliability between the shell 210 and the cover plate 220 higher, the sealing effect is better, and the risk of battery cell leakage is reduced.

[0077] In some embodiments, the first body 221 and the first flange 222 are integrally formed, which can make the structure of the cover plate 220 more stable.

[0078] In some embodiments, the first flange 22 may be formed by extending at least one side of the first body 221 , or may be formed by partially extending at least one side of the first body 221 .

[0079] In other embodiments, the first body 221 and the first flange 222 may also be fixedly connected by welding, bonding, or the like.

[0080] In some embodiments, the second flange 212 and the first flange 222 may be welded, bonded, or the like.

[0081] In some embodiments, the first flange 222 protrudes from a side of the first body 221 facing away from the second body 211 .

[0082] The first flange 222 protrudes from the side of the first body 221 facing away from the second body 211 , so that when multiple battery cells 20 are assembled, the first flange 222 can be positioned in cooperation with the second body 211 of the adjacent battery cells 20 , thereby facilitating the assembly of multiple battery cells 20 .

[0083] In some other embodiments, the first flange 222 may also protrude from a side of the first body 221 facing the second body 211 .

[0084] Please refer to Figures 6 to 8 , Figure 6 A schematic diagram of a three-dimensional structure of a battery cell from another perspective provided in some embodiments of the present application, Figure 7 for Figure 6 A schematic diagram of the partially enlarged three-dimensional structure of the battery cell at A. Figure 8 A structural schematic diagram of a partially enlarged perspective of a battery cell provided in some embodiments of the present application.

[0085] In some embodiments, the first flange 222 includes a first curved portion 2221 and a first straight portion 2222 , the first curved portion 2221 is connected to the first body 221 , the first straight portion 2222 extends from one end of the first curved portion 2221 away from the first body 221 along a first direction X, and the first direction X intersects with the outer surface of the first body 221 .

[0086] In some embodiments, the first bent portion 2221 is bent away from the second body 211 to facilitate positioning with an adjacent battery cell 20 .

[0087] The first flange 222 includes a first curved portion 2221 and a first straight portion 2222. The first curved portion 2221 is connected to the first body 221 to facilitate the bending and forming of the first flange 222. The first straight portion 2222 extends from one end of the first curved portion 2221 away from the first body 221 along the first direction X. The first direction X intersects with the outer surface of the first body 221 to facilitate the first flange 222 to cooperate and position with the second body 211 of the adjacent battery cell.

[0088] In some embodiments, the first direction X is perpendicular to the outer surface of the first body 221 .

[0089] The first direction X is perpendicular to the outer surface of the first body 221 , so that the first straight portion 2222 can abut against the second body 211 of the adjacent battery cell 20 to better achieve matching positioning with the second body 211 of the adjacent battery cell 20 .

[0090] In some embodiments, the second flange 212 includes a second curved portion 2121 and a second straight portion 2122, the second curved portion 2121 is connected to the second body 211, and the second straight portion 2122 extends along the first direction X from one end of the second curved portion 2121 away from the second body 211; the first curved portion 2221 is connected to the second curved portion 2121, and the first straight portion 2222 is connected to the second straight portion 2122.

[0091] In some embodiments, the second bent portion 2121 is bent away from the second body 211 to facilitate connection with the first bent portion 2221 .

[0092] The second flange 212 includes a second curved portion 2121 and a second straight portion 2122. The second curved portion 2121 is connected to the second body 211 to facilitate the bending and forming of the second flange 212. The second straight portion 2122 extends from one end of the second curved portion 2121 away from the second body 211 along the first direction X. The first curved portion 2221 is connected to the second curved portion 2121, and the first straight portion 2222 is connected to the second straight portion 2122, so that the connection between the first flange 222 and the second flange 212 is tighter, the connection strength is higher, the sealing is better, and the risk of leakage of the battery cell 20 is reduced.

[0093] In some embodiments, along the first direction X, the length of the first straight portion 2222 is greater than the length of the second straight portion 2122 .

[0094] Reference Figure 8 , along the first direction X, the length of the first straight portion 2222 is L1, the length of the second straight portion 2122 is L2, and L1>L2.

[0095] Along the first direction X, the length of the first straight portion 2222 is greater than that of the second straight portion 2122 , which facilitates the connection between the first straight portion 2222 and the second body 211 of the adjacent battery cell and also facilitates the connection between the first straight portion 2222 and the second straight portion 2122 .

[0096] In some embodiments, the shell 210 and the cover plate 220 form a housing 20 a , and the outer surface of the first body 221 is the outer surface with the largest area of ​​the housing 20 a .

[0097] The outer surface of the first main body 221 is the outer surface with the largest area of ​​the outer shell 20a, so that when the first main body 221 of the battery cell is connected to the second main body 211 of the adjacent battery cell, the first flange 222 can cooperate with the second main body 211 of the adjacent battery cell to position, and the arrangement of multiple battery cells is more compact, and the energy density of the battery is higher.

[0098] Please refer to Figure 3 and Figure 4 An embodiment of the present application provides a battery 100 , and the battery 100 includes a plurality of battery cells 20 provided in any of the above embodiments, and the plurality of battery cells 20 are stacked along the thickness direction of the first body 221 .

[0099] In some embodiments, the outer surface of the first body 221 is the outer surface with the largest area of ​​the outer shell 20a. Multiple battery cells 20 are stacked along the thickness direction of the first body 221, which can make the arrangement of multiple battery cells 20 in the battery 100 more compact and the energy density of the battery 100 higher.

[0100] In some embodiments, the cover plate 220 includes two first flanges 222, and the two first flanges 222 are respectively disposed at two ends of the first body 221 along the second direction Y. The plurality of battery cells 20 include adjacent first battery cells 21 and second battery cells 22. Along the second direction Y, at least a portion of the second body 211 of the first battery cell 21 is located between the two first flanges 222 of the second battery cell 22 and abuts against the two first flanges 222. The second direction Y is perpendicular to the thickness direction of the first body 221.

[0101] The cover plate 220 includes two first flanges 222, and the two first flanges 222 are respectively arranged at two ends of the first body 221 along the second direction Y. Along the second direction Y, at least a portion of the second body 211 of the first battery cell 21 is located between the two first flanges 222 of the second battery cell 22 and abuts against the two first flanges 222, so that the assembly positioning of the first battery cell 21 and the second battery cell 22 can be more accurate, and the connection between the first battery cell 21 and the second battery cell 22 is more stable.

[0102] In some embodiments, the second body 211 of the first battery cell 21 is welded or bonded to the first flange 222 of the second battery cell 22 .

[0103] The second body 211 of the first battery cell 21 and the first flange 222 of the second battery cell 22 are welded or bonded, so that the connection between the first battery cell 21 and the second battery cell 22 is more stable and has higher connection reliability.

[0104] Please refer to Figure 4 and Figure 6 In some embodiments, the second body 211 has a first wall 2111 and a second wall 2112 that are opposite to each other along the second direction Y, and a third wall 2113 that is opposite to the cover plate 220 along the thickness direction of the first body 221, and the third wall 2113 connects the first wall 2111 and the second wall 2112. The second flange 212 is connected to the first wall 2111 and / or the second wall 2112, and the connection between the first wall 2111 and the third wall 2113 is arranged in an arc shape and / or the connection between the second wall 2112 and the third wall 2113 is arranged in an arc shape.

[0105] By making the connection between the first wall 2111 and the third wall 2113 in an arc shape and / or the connection between the second wall 2112 and the third wall 2113 in an arc shape, it is possible that after the first battery cell 21 and the second battery cell 22 are assembled, the arc connection between the first wall 2111 and the third wall 2113 and / or the arc connection between the second wall 2112 and the third wall 2113 can cooperate and abut with the first flange 222 of the second battery cell 22, and the overall structure of the battery 100 is more compact, which is beneficial to improving the energy density of the battery 100.

[0106] Please refer to Figure 2 In some embodiments, the battery 100 further includes a box body 10 , the box body 10 includes a bottom wall 111 , the bottom wall 111 is used to support a plurality of battery cells 20 , and the second direction Y is parallel to the thickness direction of the bottom wall 111 .

[0107] The battery 100 also includes a box body 10, which includes a bottom wall 111. The bottom wall 111 is used to support multiple battery cells 20. The second direction Y is parallel to the thickness direction of the bottom wall 111, so that the first flange 222 can be connected to the bottom wall 111, which facilitates the arrangement and assembly of multiple battery cells 20 in the box body.

[0108] In some embodiments, each battery cell 20 further includes a first electrode terminal 230 and a second electrode terminal 240, which are protruded from the first body 221. The battery 100 further includes a busbar 30, which connects the first electrode terminal 230 of the first battery cell 21 and the second electrode terminal 240 of the second battery cell 22.

[0109] In some embodiments, the first electrode terminal 230 and the second electrode terminal 240 may be made of metal materials such as copper-plated silver, copper-plated zinc, copper, aluminum, iron, etc., which can play a role in conducting electricity and transmitting electrical signals.

[0110] In some embodiments, the first electrode terminal 230 and the second electrode terminal 240 may be provided in a rectangular parallelepiped shape.

[0111] In other embodiments, the first electrode terminal 230 and the second electrode terminal 240 may also be provided in the shape of a cylinder, an elliptical cylinder, etc.

[0112] In some embodiments, the busbar 30 is made of a conductive material and can connect two electrode terminals to achieve electrical connection between two battery cells 20 .

[0113] In some embodiments, the busbar 30 may be connected to the first electrode terminal 230 and the second electrode terminal 240 by welding, bolting, or the like.

[0114] Each battery cell 20 further includes a first electrode terminal 230 and a second electrode terminal 240, which are protrudingly disposed on the first body 221, so as to facilitate electrical connection between the plurality of battery cells 20 through the first electrode terminal 230 and the second electrode terminal 240. The battery 100 further includes a busbar 30, which connects the first electrode terminal 230 of the first battery cell 21 and the second electrode terminal 240 of the second battery cell 22, so as to realize electrical connection between the first battery cell 21 and the second battery cell 22.

[0115] In some embodiments, the first electrode terminal 230 of the first battery cell 21 and the second electrode terminal 240 of the second battery cell 22 are two electrode terminals with opposite electrodes. For example, the first electrode terminal 230 of the first battery cell 21 is a positive electrode terminal, and the second electrode terminal 240 of the second battery cell 22 is a negative electrode terminal.

[0116] In some embodiments, along the third direction Z, the busbar 30 is located at the end of the battery cell 20 , which can reduce the possibility of interference between the busbar 30 and the first flange 222 and the second flange 212 .

[0117] In some embodiments, the first battery cell 21 is provided with a notch 201 , and the notch 201 penetrates the first battery cell 21 along the thickness direction of the first body 221 , and at least a portion of the busbar 30 is accommodated in the notch 201 .

[0118] The busbar 30 can pass through the first battery cell 21 to connect the first electrode terminal 230 of the first battery cell 21 and the second electrode terminal 240 of the second battery cell 22, and the size of the portion of the busbar 30 protruding from the outer surface of the first battery cell 21 can be reduced, thereby reducing the possibility of deformation or damage of the busbar 30 when the battery is subjected to force, thereby reducing the possibility of short circuit, open circuit or even thermal runaway of multiple battery cells.

[0119] In some embodiments, the notch 201 is recessed from one side of the first battery cell 21 to the other side along the third direction Z. The thickness direction of the first body 221, the second direction Y, and the third direction Z are perpendicular to each other. This facilitates the preparation and forming of the first battery cell 21 and facilitates the placement of at least a portion of the busbar 30 in the notch 201.

[0120] In some embodiments, along the second direction Y, the busbar 30 does not extend beyond the outer surface of the first battery cell 21 . Along the third direction Z, the busbar 30 does not extend beyond the outer surface of the first battery cell 21 .

[0121] Along the second direction Y, the busbar 30 does not extend beyond the outer surface of the first battery cell 21; along the third direction Z, the busbar 30 does not extend beyond the outer surface of the first battery cell 21, so that when the battery cell is subjected to external force in the second direction Y or the third direction Z, the external force is not easily applied directly to the busbar 30, thereby reducing the possibility of deformation or damage of the busbar 30 causing short circuit, open circuit or even thermal runaway of multiple battery cells.

[0122] In some embodiments, the current busbar 30 bypasses a side of the first battery cell 21 facing away from the bottom wall 111 .

[0123] By making the busbar 30 bypass the side of the first battery cell 21 facing away from the bottom wall 111 , the busbar 30 can be installed after the battery cell 20 is installed in the box body 10 , thereby simplifying the assembly difficulty of the battery 100 and improving the assembly efficiency of the battery 100 .

[0124] In some embodiments, a cross section of the notch 201 on a plane perpendicular to the first direction X may be rectangular.

[0125] In some other embodiments, the cross-section of the notch 201 on a plane perpendicular to the first direction X may also be a square or a triangle.

[0126] The cross section of the notch 201 on a plane perpendicular to the first direction X is rectangular, square or triangular, which can facilitate the preparation of the notch 201 and the installation of the busbar 30 in the notch 201 .

[0127] In some embodiments, the structures of the plurality of battery cells 20 are the same, and one of two adjacent battery cells 20 is rotated 180° relative to the other.

[0128] By making the structures of the multiple battery cells 20 the same, the manufacturing process of the battery 100 can be simplified, the manufacturing cost of the battery 100 can be reduced, and the manufacturing efficiency of the battery 100 can be improved. One of the two adjacent battery cells 20 is rotated 180 degrees relative to the other, so that the electrode terminals of the two adjacent battery cells 20 with opposite polarities can correspond and be connected, so as to realize the series connection of the multiple battery cells 20.

[0129] In some embodiments, along the second direction Y, the notch 201 of the first battery cell 21 is disposed on a side of the first battery cell 21 away from the bottom wall 111 , and the notch 201 of the second battery cell 22 is disposed on a side of the second battery cell 22 close to the bottom wall 111 .

[0130] By making the notch 201 of the first battery cell 21 be arranged on the side of the first battery cell 21 away from the bottom wall 111 and the notch 201 of the second battery cell 22 be arranged on the side of the second battery cell 22 close to the bottom wall 111 along the second direction Y, each battery cell 20 only needs to be provided with one notch 201, which can simplify the preparation process of the battery cell 20, reduce the preparation cost of the battery cell 20, and improve the preparation efficiency of the battery cell 20.

[0131] If the battery cell 20 is provided with only one notch 201, the current collector (not shown in the figure) provided in the notch 201 of the second battery cell 22 is located on the side of the second battery cell 22 facing the bottom wall 111. In other embodiments, each battery cell 20 may be provided with two notches 201, and the two notches 201 are respectively provided at both ends of the battery cell 20 along the second direction Y, and the current collector 30 between any two adjacent battery cells 20 may be provided at one of the two notches 201 away from the bottom wall 111, and the current collector 30 may be installed after the battery cell 20 is loaded into the box 10, thereby simplifying the assembly difficulty of the battery 100 and improving the assembly efficiency of the battery 100.

[0132] See also Fig. 9 , Fig. 9 A schematic diagram of the three-dimensional structure of a busbar provided in some embodiments of the present application.

[0133] In some embodiments, the busbar 30 includes a busbar portion 310, a first connecting portion 320 and a second connecting portion 330, the first connecting portion 320 is connected to the first electrode terminal 230 of the first battery cell 21, the second connecting portion 330 is connected to the second electrode terminal 240 of the second battery cell 22, the busbar portion 310 connects the first connecting portion 320 and the second connecting portion 330, and at least a portion of the busbar portion 310 is accommodated in the notch 201.

[0134] The busbar 30 includes a busbar portion 310, a first connection portion 320, and a second connection portion 330. The first connection portion 320 is connected to the first electrode terminal 230 of the first battery cell 21, and the second connection portion 330 is connected to the second electrode terminal 240 of the second battery cell 22. The busbar portion 310 connects the first connection portion 320 and the second connection portion 330, and can realize the electrical connection between the first electrode terminal 230 of the first battery cell 21 and the second electrode terminal 240 of the second battery cell 22. At least a portion of the busbar portion 310 is accommodated in the notch 201, which can reduce the size of the portion of the busbar portion 310 protruding from the outer surface of the first battery cell 21, thereby reducing the possibility of deformation or damage of the busbar portion 310 when the battery 100 is subjected to force, thereby reducing the possibility of short circuit, open circuit or even thermal runaway of multiple battery cells 20.

[0135] See also Fig.10 , Fig.10 A schematic diagram of the three-dimensional structure of a first battery cell provided in some embodiments of the present application.

[0136] In some embodiments, the first electrode terminal 230 of the first battery cell 21 includes an end face 231 and a side face 232 , the end face 231 is perpendicular to the first direction X, the side face 232 is perpendicular to the third direction Z, at least a portion of the first connection portion 320 is connected to the end face 231 , and at least a portion of the first connection portion 320 is connected to the side face 232 .

[0137] By connecting at least a portion of the first connection portion 320 to the end surface 231 and at least a portion of the first connection portion 320 to the side surface 232, the connection area between the first electrode terminal 230 of the first battery cell 21 and the busbar 30 can be increased, thereby improving the connection reliability between the first electrode terminal 230 of the first battery cell 21 and the busbar 30.

[0138] The connection structure between the second electrode terminal 240 and the second connection portion 330 of the second battery cell 22 is similar to the connection structure between the first electrode terminal 230 and the first connection portion 320 of the first battery cell 21 , and will not be described in detail herein.

[0139] In some embodiments, the battery 100 further includes a box body 10 and an adhesive (not shown in the figure), at least part of the plurality of battery cells 20 are accommodated in the box body 10 , and the adhesive is disposed between the second flange 212 and the box body 10 .

[0140] The battery 100 also includes a box body 10 and an adhesive. At least part of the multiple battery cells 20 are accommodated in the box body. The adhesive is arranged between the second flange 212 and the box body 10, which can make the connection between the battery cell 20 and the box body 10 more stable and the connection reliability higher. The position of the battery cell 20 in the box body 10 is more stable, and the battery cell 20 is not easy to collide with the box body 10 and cause damage.

[0141] In some embodiments, at least a portion of the adhesive may be disposed on a portion of the first flange 222 protruding from the second flange 212 , so that the adhesive area of ​​the adhesive is larger and the connection reliability between the battery cell 20 and the box body 10 is higher.

[0142] In a third aspect, the present application provides an electrical device, including a battery as described above, and the battery is used to provide electrical energy.

[0143] The electrical equipment may be any of the aforementioned systems or equipment using the battery 100 .

[0144] Please refer to Figures 4 to 8 The embodiment of the present application provides a battery cell 20, which includes a shell 210 and a cover plate 220. The shell 210 has an opening, and the cover plate 220 is used to close the opening. The cover plate 220 includes a first main body 221 and a first flange 222. The shell 210 includes a second main body 211 and a second flange 212. The first flange 222 is bent relative to the first main body 221, and the first flange 222 protrudes from the side of the first main body 221 facing away from the second main body 211. The second flange 212 is connected to the first flange 222. The shell 210 and the cover plate 220 form a shell 20a, and the outer surface of the first main body 221 is the outer surface with the largest area of ​​the shell 20a.

[0145] The first flange 222 includes a first curved portion 2221 and a first straight portion 2222 . The first curved portion 2221 is connected to the first body 221 . The first straight portion 2222 extends from one end of the first curved portion 2221 away from the first body 221 along a first direction X. The first direction X is perpendicular to the outer surface of the first body 221 .

[0146] The second flange 212 includes a second curved portion 2121 and a second straight portion 2122, the second curved portion 2121 is connected to the second body 211, and the second straight portion 2122 extends from one end of the second curved portion 2121 away from the second body 211 along the first direction X; the first curved portion 2221 is connected to the second curved portion 2121, and the first straight portion 2222 is connected to the second straight portion 2122.

[0147] Along the first direction X, the length of the first straight portion 2222 is greater than the length of the second straight portion 2122 .

[0148] The embodiment of the present application provides a battery 100, which includes a plurality of battery cells 20, and the plurality of battery cells 20 are stacked along the thickness direction of a first main body 221. The cover plate 220 includes two first flanges 222, and along the second direction Y, the two first flanges 222 are respectively arranged at both ends of the first main body 221. The plurality of battery cells 20 include adjacent first battery cells 21 and second battery cells 22. Along the second direction Y, at least a portion of the second main body 211 of the first battery cell 21 is located between the two first flanges 222 of the second battery cell 22, and abuts against the two first flanges 222. The second direction Y is perpendicular to the thickness direction of the first main body 221.

[0149] Each battery cell 20 further includes a first electrode terminal 230 and a second electrode terminal 240, which are protruded from the first body 221. The battery 100 further includes a busbar 30, which connects the first electrode terminal 230 of the first battery cell 21 and the second electrode terminal 240 of the second battery cell 22.

[0150] The first battery cell 21 is provided with a notch 201, which penetrates the first battery cell 21 along the thickness direction of the first body 221, and at least a portion of the busbar 30 is accommodated in the notch 201. Along the second direction Y, the busbar 30 does not extend beyond the outer surface of the first battery cell 21. Along the third direction Z, the busbar 30 does not extend beyond the outer surface of the first battery cell 21.

[0151] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0152] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: It comprises a shell and a cover plate, wherein the shell has an opening, and the cover plate is used to close the opening; The cover plate includes a first main body and a first flange, the shell includes a second main body and a second flange, the first flange is bent relative to the first main body, and the second flange is connected to the first flange.

2. The battery cell according to claim 1, characterized in that: The first flange protrudes from a side of the first body facing away from the second body.

3. The battery cell according to claim 1, characterized in that: The first flange includes a first curved portion and a first straight portion, the first curved portion is connected to the first body, the first straight portion extends from one end of the first curved portion away from the first body along a first direction, and the first direction intersects with an outer surface of the first body.

4. The battery cell according to claim 3, characterized in that: The first direction is perpendicular to an outer surface of the first body.

5. The battery cell according to claim 3, characterized in that: The second flange includes a second curved portion and a second straight portion, the second curved portion is connected to the second body, and the second straight portion extends from an end of the second curved portion away from the second body along the first direction; The first curved portion is connected to the second curved portion, and the first straight portion is connected to the second straight portion.

6. The battery cell according to claim 5, characterized in that: Along the first direction, the length of the first straight portion is greater than the length of the second straight portion.

7. The battery cell according to claim 1, characterized in that: The shell and the cover plate form an outer shell, and the outer surface of the first body is the outer surface of the outer shell with the largest area.

8. A battery, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 7, wherein the plurality of battery cells are stacked along a thickness direction of the first body.

9. The battery according to claim 8, characterized in that The cover plate includes two first flanges, and along the second direction, the two first flanges are respectively arranged at two ends of the first body; The plurality of battery cells include adjacent first and second battery cells; Along the second direction, at least a portion of the second body of the first battery cell is located between the two first flanges of the second battery cell and abuts against the two first flanges; The second direction is perpendicular to a thickness direction of the first body.

10. The battery according to claim 9, characterized in that The second body of the first battery cell is welded or bonded to the first flange of the second battery cell.

11. The battery according to claim 9, characterized in that The battery further includes a box body, the box body includes a bottom wall, the bottom wall is used to support the plurality of battery cells, and the second direction is parallel to a thickness direction of the bottom wall.

12. The battery according to claim 8, characterized in that Each of the battery cells further comprises a first electrode terminal and a second electrode terminal, wherein the first electrode terminal and the second electrode terminal are protrudingly disposed on the first body; The plurality of battery cells include adjacent first and second battery cells; The battery further includes a bus bar connecting the first electrode terminal of the first battery cell and the second electrode terminal of the second battery cell.

13. The battery according to claim 12, characterized in that The first battery cell is provided with a notch, the notch penetrates the first battery cell along a thickness direction of the first body, and at least a portion of the current collector is accommodated in the notch.

14. The battery according to claim 13, characterized in that Along the second direction, the busbar does not exceed the outer surface of the first battery cell; along the third direction, the busbar does not exceed the outer surface of the first battery cell; the thickness direction of the first body, the second direction, and the third direction are perpendicular to each other.

15. The battery according to claim 8, characterized in that The battery further comprises a box body and an adhesive member, at least part of the plurality of battery cells are accommodated in the box body, and the adhesive member is arranged between the second flange and the box body.

16. An electrical equipment, characterized in that: The invention comprises a battery as claimed in any one of claims 8 to 15, wherein the battery is used to provide electrical energy.

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