Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell with an accommodating cavity and an electrode assembly accommodated in the accommodating cavity, the shell comprises a bottom plate, a main body plate and an end cover, the main body plate surrounds the bottom plate and defines a containing groove with the bottom plate, the surface, facing the containing groove, of the main body plate comprises an inner side face, and the surface, back to the containing groove, of the main body plate comprises an outer side face; a first thickening part protruding towards the containing groove relative to the inner side face and / or protruding back to the containing groove relative to the outer side face is formed on the edge of the first end of the main body plate, and the size of the first thickening part is larger than the distance between the inner side face and the outer side face in the wall thickness direction of the main body plate; the first end is welded to the second end of the main body plate through the end face, located in the wall thickness direction, of the first thickening part, and the containing groove is provided with an opening opposite to the bottom plate; the end cover seals the opening and defines a containing cavity with the main body plate and the bottom plate. The battery monomer, the battery device and the power utilization device provided by the utility model have high structural strength.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to battery cells, battery devices, and electrical devices. Background Art

[0002] New energy batteries are increasingly being used in everyday life and industry. For example, battery-powered new energy vehicles are already widely used. Furthermore, batteries are increasingly being used in energy storage and other fields. In new energy vehicles, batteries can provide full or partial power. In energy storage, batteries can be installed in energy storage boxes or directly at the user's side.

[0003] The structural strength of the battery is related to its service life, mechanical stability and other performance. Therefore, how to improve the structural strength of the battery is one of the topics that the industry needs to study. Utility Model Content

[0004] In order to solve the above technical problems, the present application provides a battery cell, a battery device and an electrical device with high structural strength.

[0005] This application is implemented through the following technical solutions.

[0006] 18. The battery as claimed in claim 17, wherein the cover has two opposite ends, and the two ends are connected along the circumference of the battery cover to form a base plate, the two ends respectively connected to the cover of the battery cover and the base plate, the two ends of the battery cover being connected.

[0007] By locally thickening the first end edge of the main plate to form a first thickened portion, the area of the end surface of the first thickened portion in the wall thickness direction is increased, which is beneficial to increasing the contact area between the first end and the second end of the main plate, reducing the probability of welding through, improving welding reliability, and thereby improving the structural strength of the battery cell.

[0008] In some embodiments, the edge of the second end is formed with a second thickened portion that protrudes toward the accommodating groove relative to the inner side surface and / or protrudes away from the accommodating groove relative to the outer side surface. Along the wall thickness direction of the main body plate, the size of the second thickened portion is greater than the distance between the inner side surface and the outer side surface, and the end surface of the second thickened portion located in the wall thickness direction is welded to the end surface of the first thickened portion located in the wall thickness direction.

[0009] By locally thickening the second end edge of the main plate to form a second thickened portion, the area of the end face of the second thickened portion in the wall thickness direction is increased, and the end face with a larger area is welded to the end face with a larger surface area, thereby further increasing the contact area between the first end and the second end of the main plate, reducing the probability of welding through, improving welding reliability, and thereby improving the structural strength of the battery cell.

[0010] In some embodiments, the end surface of the first thickened portion in the wall thickness direction is welded to the inner side surface of the second end.

[0011] Because the area of the end surface of the first thickened portion in the wall thickness direction is increased, the inner surface area of the second end of the main plate is relatively large. Therefore, the contact area between the larger end surface and the inner surface of the second end is larger, reducing the probability of weld penetration, improving welding reliability, and further enhancing the structural strength of the battery cell.

[0012] In some embodiments, a third thickened portion is formed on an end edge of the main body plate away from the end cover, protruding relative to the inner side surface facing the accommodating groove and / or protruding relative to the outer side surface away from the accommodating groove. Along the wall thickness direction of the main body plate, the size of the third thickened portion is greater than the distance between the inner side surface and the outer side surface, and the end surface of the third thickened portion located in the wall thickness direction is welded to the surface of the bottom plate facing the accommodating cavity.

[0013] Because the third thickened portion is thicker, the end surface of the third thickened portion, located in the wall thickness direction, has a larger area. The surface of the base plate facing the accommodating cavity is also larger. Therefore, the larger end surface has a larger contact area with the inner surface of the base plate, reducing the chance of weld penetration, improving welding reliability, and thus enhancing the structural strength of the battery cell.

[0014] In some embodiments, the main body plate includes two first plates opposite to each other along a first direction and perpendicular to the first direction and two second plates opposite to each other along a second direction and perpendicular to the second direction, the two ends of each first plate are respectively connected to the two second plates, the bottom plate and the end cover are opposite to each other along a third direction and perpendicular to the third direction, and the first direction, the second direction and the third direction are perpendicular to each other.

[0015] In this way, the outer shell formed is a cubic shell, that is, the battery cell is a square shell battery, and the square shell battery has high structural strength.

[0016] In some embodiments, a dimension of the first plate along the second direction is greater than a dimension of the second plate along the first direction, and a first weld formed by welding the first end and the second end is located on the second plate.

[0017] In this way, the outer surface of the first plate is the large surface of the battery cell, the outer surface of the second plate is the side surface of the battery cell, and the first weld formed by welding the first end and the second end of the main plate is located on the side surface of the battery cell with a smaller area, which is beneficial to improving the structural strength of the battery cell.

[0018] In some embodiments, the accommodating cavity accommodates more than one electrode assembly, the electrode assembly is a winding structure, and the electrode assembly includes interconnected bent sections and straight sections. The stacking direction of the straight sections is the thickness direction of the electrode assembly, and the thickness direction of the electrode assembly is consistent with the first direction.

[0019] In this way, the electrode assembly is accommodated in the accommodating cavity in a suitable orientation, and more electrode assemblies can be accommodated in the accommodating cavity with a fixed volume, which is beneficial to improving the volume energy density of the battery cell.

[0020] In some embodiments, the electrode assemblies are arranged along the first direction, the winding axis of the electrode assemblies is consistent with the third direction, and along the second direction, the first weld corresponds to the joining seam of two adjacent electrode assemblies; or, the first weld is located at the edge of either end of the second plate along the first direction.

[0021] In this way, the housing does not need to increase the volume of the accommodating cavity due to the formation of the first thickened portion to adapt to the electrode assembly, thereby improving the structural strength of the battery cell without affecting the volume energy density.

[0022] In some embodiments, the winding axis of the electrode assembly is consistent with the second direction, and a third thickened portion is formed on the end edge of the first plate away from the end cover, protruding relative to the inner side surface facing the accommodating groove. Along the wall thickness direction of the first plate, the size of the third thickened portion is greater than the distance between the inner side surface and the outer side surface, and the end surface of the third thickened portion located in the wall thickness direction is welded to the surface of the bottom plate facing the accommodating cavity.

[0023] In this way, the shell does not need to increase the volume of the accommodating cavity due to the formation of the third thickened portion to adapt to the electrode assembly, so that the structural strength of the battery cell is improved without affecting the volume energy density.

[0024] In some embodiments, the distance between the inner side surface and the outer side surface along the wall thickness direction of the main body plate is in the range of 0.075 mm to 0.4 mm.

[0025] In this way, by limiting the wall thickness of the main body portion of the main plate to the range of 0.075 mm to 0.4 mm, the main plate is made thinner, which is beneficial for reducing the volume of the battery cell and improving the volume energy density of the battery cell.

[0026] In some embodiments, the distance between the inner side surface and the outer side surface along the wall thickness direction of the main body plate is in the range of 0.1 mm to 0.25 mm.

[0027] In this way, by limiting the wall thickness of the main body portion of the main plate to the range of 0.1 mm to 0.25 mm, the main plate is made thinner, which is beneficial for reducing the volume of the battery cell and improving the volume energy density of the battery cell.

[0028] In some embodiments, the edge of the first end of the main body plate is bent toward the inside or outside of the accommodating cavity to form the first thickened portion.

[0029] In this way, the first thickened portion is formed by bending, so that the main body plate can be made of a straight plate, which is easy to manufacture and has low manufacturing cost.

[0030] In some embodiments, the edge of the second end of the main body plate is bent toward the inside or outside of the accommodating cavity to form the second thickened portion.

[0031] In this way, the second thickened portion is formed by bending, so that the main body plate can be made of a straight plate, which is easy to manufacture and has low manufacturing cost.

[0032] In some embodiments, an edge of one end of the main body plate away from the end cover is bent toward the inner side and / or the outer side of the accommodating cavity to form the third thickened portion.

[0033] In this way, the third thickened portion is formed by bending, so that the main body plate can be made of a straight plate, which is easy to manufacture and has low manufacturing cost.

[0034] In some embodiments, the bending angle is in the range of 60° to 120°.

[0035] In this way, by limiting the bending angle to the range of 60° to 120°, a first thickened portion, a second thickened portion or a third thickened portion with appropriate thickness and stable structure can be formed.

[0036] In some embodiments, a dimension of the first thickened portion along a wall thickness direction of the main plate is in a range of 0.15 mm to 2 mm.

[0037] In this way, by limiting the thickness of the first thickened portion to the range of 0.15 mm to 2 mm, the welding reliability is improved, the probability of welding through is reduced, and the structural strength is improved, while the volume energy density of the battery cell is not affected by the excessive thickness.

[0038] In some embodiments, a dimension of the second thickened portion along a wall thickness direction of the main plate is in a range of 0.15 mm to 2 mm.

[0039] In this way, by limiting the thickness of the second thickened portion to the range of 0.15 mm to 2 mm, the probability of welding through is reduced, the reliability of welding is improved, and the structural strength is increased, while the volume energy density of the battery cell is not affected by the excessive thickness.

[0040] In some embodiments, a dimension of the third thickened portion along the wall thickness direction of the main plate is in the range of 0.15 mm to 2 mm.

[0041] In this way, by limiting the thickness of the third thickened portion to the range of 0.15 mm to 2 mm, the probability of welding through is reduced, the reliability of welding is improved, and the structural strength is increased, while the volume energy density of the battery cell is not affected by the excessive thickness.

[0042] In some embodiments, one of the end surface of the first thickened portion in the wall thickness direction and the surface of the second end is formed with a recessed portion, and the other is formed with a protruding portion, and the protruding portion penetrates into the recessed portion.

[0043] The cooperation between the recessed portion and the protruding portion increases the contact area between the first end and the second end, thereby improving the welding effect.

[0044] In some embodiments, the material of the base plate is any one of steel, iron, and hard polymer materials; and / or the material of the main plate is any one of steel, iron, and hard polymer materials; and / or the material of the end cover is any one of steel, iron, and hard polymer materials.

[0045] Thus, the bottom plate, main plate or end cap made of the above materials has high structural strength, which is beneficial to improving the structural strength of the battery cell. Moreover, the bottom plate, main plate or end cap can be set relatively thin, which is beneficial to improving the volume energy density of the battery cell.

[0046] In some embodiments, the inner surface of the main body plate is provided with reinforcing ribs.

[0047] By providing reinforcing ribs on the inner surface of the main body plate, the structural strength of the main body plate can be improved, thereby further improving the structural strength of the battery cell.

[0048] A second aspect of the present application provides a battery device comprising a plurality of battery cells provided by the first aspect.

[0049] Since the battery device includes the battery cell provided by the first aspect, and the battery cell has high structural strength, the battery device also has high structural strength.

[0050] A third aspect of the present application provides an electrical device, comprising the battery cell provided in the first aspect or the battery device provided in the second aspect.

[0051] Since the battery device includes the battery cell provided in the first aspect or the battery device provided in the second aspect, and the battery cell and the battery device have high structural strength, the electrical device also has high structural strength.

[0052] The beneficial effects of the embodiments of the present disclosure include: through this application, a battery cell, a battery device and an electrical device with high structural strength are provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference numerals are used throughout the drawings to denote the same components. In the drawings:

[0054] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments;

[0055] Figure 2 is a perspective exploded schematic diagram of a battery pack according to one or more embodiments;

[0056] Figure 3 is a schematic diagram of a three-dimensional structure of a battery cell according to one or more embodiments;

[0057] Figure 4 is a perspective exploded schematic diagram of a battery cell according to one or more embodiments;

[0058] Figure 5 is a top view of a structure of a main body plate according to one or more embodiments;

[0059] Figure 6 for Figure 5 An enlarged view of the structure at A in the middle, not showing the first weld;

[0060] Figure 7 for Figure 5 A magnified view of the structure at point A showing the first weld;

[0061] Figure 8is a cross-sectional view of a battery cell according to one or more embodiments, taken along a direction perpendicular to a first direction;

[0062] Figure 9 for Figure 8 Enlarged view of point B in the middle;

[0063] Figure 10 is a top view of another structure of a main body plate according to one or more embodiments;

[0064] Figure 11 for Figure 10 Enlarged view of point C in the middle;

[0065] Figure 12 is a cross-sectional view of a first structure of a battery cell according to one or more embodiments, taken along a direction perpendicular to a second direction;

[0066] Figure 13 for Figure 12 Enlarged view of point D in the middle;

[0067] Figure 14 is a schematic structural diagram of an electrode assembly according to one or more embodiments;

[0068] Figure 15 is a cross-sectional view of a second structure of a battery cell according to one or more embodiments, taken along a direction perpendicular to a third direction;

[0069] Figure 16 FIG. 4 is a partial schematic diagram of a first weld seam of a body plate according to one or more embodiments.

[0070] Figure 17 is a schematic diagram of the inner structure of the first plate according to one or more embodiments;

[0071] Figure 18 is a schematic diagram of the inner structure of a bottom plate according to one or more embodiments;

[0072] Figure 19 Schematic diagram of the inner structure of the end cover according to one or more embodiments.

[0073] Description of Reference Numerals

[0074] 1000 vehicle; 100 battery pack; 200 controller; 300 motor; 10 battery box; 101 box cover; 102 box body; 20 battery cell; 1 outer shell; 11 main plate; 111 first plate; 112 second plate; 113 first thickened portion; 114 second thickened portion; 1141 protrusion; 115 third thickened portion; 116 first weld; 117 inner side; 118 outer side; 119 second weld; 12 bottom plate; 13 end cover; 14 reinforcing rib; 15 pressure relief mechanism; 16 adapter; 17 conductive terminal; 2 electrode assembly; 21 bent section; 22 straight section. DETAILED DESCRIPTION

[0075] The following embodiments of the technical solution of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application and are therefore only examples and are not intended to limit the scope of protection of the present application.

[0076] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions.

[0077] In the description of the embodiments of this application, the technical terms "first," "second," "third," etc. are used only to distinguish different objects and should not be understood to indicate or imply relative importance or implicitly specify the quantity, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "plurality" is more than two, unless otherwise specifically defined.

[0078] References herein to "embodiments" mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0079] In the description of the embodiments of this application, the term "and / or" is simply a description of the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent the following three situations: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0080] In the description of the embodiments of the present application, the orientations or positional relationships indicated by technical terms such as "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", and "circumferential" are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the embodiments of 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, operated or used in a specific orientation. Therefore, they should not be understood as limitations on the embodiments of the present application.

[0081] In the description of the embodiments of the present application, unless otherwise expressly specified or limited, technical terms such as "installed," "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; internal connections between two components or interactions between two components. Those skilled in the art can understand the specific meanings of the above terms in the embodiments of the present application based on specific circumstances.

[0082] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, the technical term "contact" should be understood in a broad sense, and can be direct contact, contact through an intermediate medium layer, contact with essentially no interaction force between the two contacting parties, or contact with interaction force between the two contacting parties.

[0083] Below, this application is described in detail.

[0084] Currently, new energy batteries are increasingly being used in everyday life and industry. They are not only used in energy storage systems such as hydropower, thermal power, wind power, and solar power plants, but are also widely used in electric vehicles like electric bicycles, electric motorcycles, and electric cars, as well as in a variety of fields such as aerospace. As the application of power batteries continues to expand, market demand is also growing.

[0085] Typically, the electrode assembly of a battery cell is housed within the housing cavity of a casing, which is formed by welding sheet materials. In the prior art, to increase the volumetric energy density of the battery cell, the casing is typically made relatively thin. Consequently, weld penetration is prone to occur during the casing welding process, resulting in poor welds and compromising the structural strength of the battery cell.

[0086] The inventors of the present application have discovered through research that by locally thickening the welding portion of the shell, the probability of the shell being welded through can be reduced, thereby improving the structural strength of the battery cell.

[0087] Based on such a design concept, the inventor of the present application designed a battery cell, which includes a shell having a accommodating cavity and an electrode assembly accommodated in the accommodating cavity; the shell includes a bottom plate, a main plate and an end cover, the main plate surrounds the bottom plate and forms a accommodating groove with the bottom plate, the surface of the main plate facing the accommodating groove includes an inner side surface, and the surface of the main plate facing away from the accommodating groove includes an outer side surface, and the two ends of the main plate along the circumference of the bottom plate are respectively a first end and a second end, and the edge of the first end is formed with a first thickened portion protruding relative to the inner side surface facing the accommodating groove and / or protruding relative to the outer side surface away from the accommodating groove, along the wall thickness direction of the main plate, the size of the first thickened portion is greater than the spacing between the inner side surface and the outer side surface, the first end is welded to the second end through the end face of the first thickened portion located in the wall thickness direction, and the accommodating groove has an opening opposite to the bottom plate; the end cover closes the opening and forms a accommodating cavity with the main plate and the bottom plate.

[0088] In this way, by providing a locally thickened first thickened portion at the first end edge of the main plate and welding the first end to the second end through the first thickened portion, the probability of shell welding through can be reduced, thereby improving the structural strength of the battery cell.

[0089] The battery cells provided in the embodiments of the present application can be grouped into a plurality of battery cell assemblies to provide voltage and capacity. The plurality of battery cells of the battery cell assembly can be connected in series, in parallel or in hybrid via a busbar component.

[0090] The battery cells provided in the embodiments of the present application can be applied to a battery device. A battery device (Battery Apparatus) can include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly (Battery Cell Assembly) can include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0091] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is a battery module formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0092] In some embodiments, the battery device may be a battery pack, which includes a battery box and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the battery box.

[0093] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in a battery box by fixing the battery module in the battery box.

[0094] As an example, the battery cell assembly may also be housed in the battery box by directly fixing the plurality of battery cells to the battery box.

[0095] In some embodiments, the battery device refers to an energy storage device, which includes a battery box with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0096] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells and battery devices, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.

[0097] In the following embodiments, for the convenience of description, the electric device of one embodiment of the present application is taken as an example of a vehicle 1000. The following description is made with reference to the accompanying drawings.

[0098] Figure 1 is a schematic structural diagram of a vehicle according to one or more embodiments.

[0099] The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle. Figure 1 As shown, a battery pack 100 is installed inside vehicle 1000. Battery pack 100 can be located at the bottom, front, or rear of vehicle 1000. Battery pack 100 can be used to power vehicle 1000. For example, battery pack 100 can serve as an operating power source for vehicle 1000. Vehicle 1000 also includes a controller 200 and a motor 300. Controller 200 is used to control battery pack 100 to power motor 300, for example, to meet the power requirements of vehicle 1000 during startup, navigation, and driving.

[0100] In some embodiments of the present application, the battery pack 100 can not only serve as the operating power source of the vehicle 1000, but also serve as the driving power source of the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0101] Figure 2 is a schematic exploded perspective view of a battery pack according to one or more embodiments.

[0102] like Figure 2 As shown, the battery pack 100 includes a battery box 10 and at least one battery cell 20 . An accommodation space is provided in the battery box 10 , and the at least one battery cell 20 is accommodated in the accommodation space.

[0103] In some embodiments of the present application, the battery box 10 includes a box body 102 and a box cover 101 , and the box cover 101 covers the box body 102 , thereby forming the accommodating space between the box body 102 and the box cover 101 .

[0104] The case 102 can be a hollow structure with one end open, and the cover 101 can be a plate-like structure. The cover 101 covers the open side of the case 102, so that the cover 101 and the case 102 jointly define a storage space. The cover 101 and the case 102 can also be hollow structures with one end open, with the open side of the cover 101 covering the open side of the case 102. Of course, the battery case 10 formed by the cover 101 and the case 102 can have various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0105] In the battery pack 100, there may be multiple battery cells 20, and the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. Hybrid connection refers to the multiple battery cells 20 being connected both in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery pack 20 may be placed in the storage space formed by the case 102 and the case cover 101. Of course, the battery pack 100 may also be formed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a complete battery pack, which is then stored in the storage space formed by the case 102 and the case cover 101. The battery pack 100 may also include other structures, for example, the battery pack 100 may also include a busbar component for electrically connecting the multiple battery cells 20.

[0106] In the embodiment of the present application, the battery cell 20 may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0107] The battery cell 20 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel metal hydride battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiment of the present application.

[0108] Below, refer to Figures 3 to 19 Some embodiments of the present application are described in detail.

[0109] Figure 3 is a schematic diagram of a three-dimensional structure of a battery cell according to one or more embodiments; Figure 4 is a perspective exploded schematic diagram of a battery cell according to one or more embodiments; Figure 5 is a top view of a structure of a main body plate according to one or more embodiments; Figure 6 for Figure 5 An enlarged view of the structure at A in the middle, not showing the first weld; Figure 7 for Figure 5 A magnified view of the structure at point A showing the first weld; Figure 8 is a cross-sectional view of a battery cell according to one or more embodiments, taken along a direction perpendicular to a first direction; Figure 9 for Figure 8 Enlarged view of point B in the middle; Figure 10 is a top view of another structure of a main body plate according to one or more embodiments; Figure 11 for Figure 10 Enlarged view of point C in the middle; Figure 12 is a cross-sectional view of a first structure of a battery cell according to one or more embodiments, taken along a direction perpendicular to a second direction; Figure 13 for Figure 12 Enlarged view of point D in the middle; Figure 14 is a schematic structural diagram of an electrode assembly according to one or more embodiments; Figure 15 is a cross-sectional view of a second structure of a battery cell according to one or more embodiments, taken along a direction perpendicular to a third direction; Figure 16 is a partial schematic diagram of a first weld seam of a body plate according to one or more embodiments; Figure 17 is a schematic diagram of the inner structure of the first plate according to one or more embodiments; Figure 18 is a schematic diagram of the inner structure of a bottom plate according to one or more embodiments; Figure 19 Schematic diagram of the inner structure of the end cover according to one or more embodiments.

[0110] The first aspect of the present application provides a battery cell 20, such as Figures 3 to 11 As shown, the battery cell 20 includes a shell 1 with a receiving cavity and an electrode assembly 2 received in the receiving cavity; the shell 1 includes a bottom plate 12, a main body plate 11 and an end cover 13, the main body plate 11 surrounds the bottom plate 12 and forms a receiving groove with the bottom plate 12, the surface of the main body plate 11 facing the receiving groove includes an inner side surface 117, and the surface of the main body plate 11 facing away from the receiving groove includes an outer side surface 118, the two ends of the main body plate 11 along the circumference of the bottom plate 12 are respectively a first end and a second end, the edge of the first end is formed with a first thickened portion 113 protruding toward the receiving groove relative to the inner side surface 117 and / or protruding away from the receiving groove relative to the outer side surface 118, along the wall thickness direction of the main body plate 11, the size of the first thickened portion 113 is greater than the distance between the inner side surface 117 and the outer side surface 118, the first end is welded to the second end through the end surface of the first thickened portion 113 located in the wall thickness direction, and the receiving groove has an opening opposite to the bottom plate 12; the end cover 13 closes the opening and forms a receiving cavity with the main body plate 11 and the bottom plate 12.

[0111] The electrode assembly 2 is a component in the battery cell 20 where the electrochemical reaction occurs. One or more electrode assemblies 2 may be contained in the housing 1. The electrode assembly 2 includes a cathode electrode sheet, an anode electrode sheet, and a separator. The battery cell mainly relies on the movement of metal ions between the cathode electrode sheet and the anode electrode sheet to work. The cathode electrode sheet includes a cathode current collector and a cathode active material layer, and the cathode active material layer is coated on the surface of the cathode current collector; the cathode current collector includes a cathode current collector and a cathode protrusion protruding from the cathode current collector, the cathode current collector is coated with the cathode active material layer, and at least part of the cathode protrusion is not coated with the cathode active material layer, and the cathode protrusion serves as a cathode tab. Taking lithium-ion batteries as an example, the material of the cathode current collector can be aluminum, the cathode active material layer includes a cathode active material, and the cathode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc. The anode electrode sheet includes an anode current collector and an anode active material layer, and the anode active material layer is coated on the surface of the anode current collector; the anode current collector includes an anode current collecting portion and an anode protrusion protruding from the anode current collecting portion, the anode collecting portion is coated with the anode active material layer, and at least a portion of the anode protrusion is not coated with the anode active material layer, and the anode protrusion serves as the anode tab. The material of the anode current collector can be copper, and the anode active material layer includes an anode active material, and the anode active material can be carbon or silicon, etc. In order to ensure that a large current can pass without melting, the number of cathode tabs is multiple and stacked together, and the number of anode tabs is multiple and stacked together. In addition, the electrode assembly can be a wound structure, but the embodiments of the present application are not limited to this.

[0112] The "circumferential direction of the bottom plate 12" also refers to the direction in which the main plate 11 surrounds the bottom plate 12. The main plate 11 is divided into a first end and a second end at both ends along the direction of surrounding the bottom plate 12. The first end and the second end are welded to form a hollow and closed sleeve-like structure. The main plate 11 surrounds the bottom plate 12 and forms a receiving groove with the bottom plate 12. The receiving groove has an opening opposite to the bottom plate 12. The end cover 13 closes the opening and forms a receiving cavity with the main plate 11 and the bottom plate 12. The shape of the main plate 11 can be adapted to the shape of the bottom plate 12 to match the bottom plate 12. Exemplarily, the bottom plate 12 is a square plate-like structure, and the main plate 11 is a sleeve-like structure with a square cross-section; the bottom plate 12 is a circular plate-like structure, and the main plate 11 is a sleeve-like structure with a circular cross-section. Without limitation, the main plate 11 can also be a sleeve-like structure of many other different shapes and sizes. Optionally, the main plate 11 and the bottom plate 12 can be made of a material with a certain degree of hardness and strength. This prevents deformation of the main plate 11 and the bottom plate 12 when subjected to compression or collision, thereby providing the battery cell 20 with greater structural strength and improved safety. The main plate 11 and the bottom plate 12 can be made of a variety of materials, such as copper, iron, aluminum, aluminum alloys, plastic, steel, titanium alloys, and copper alloys, and this embodiment of the present application does not impose any particular limitation on this.

[0113] The end cap 13 is a component that closes the opening of the receiving slot formed by the main plate 11 and the bottom plate 12, isolating the internal environment of the battery cell 20 from the external environment. The shape of the end cap 13 can be adapted to match the shape of the main plate 11 to complement the main plate 11. Optionally, the end cap 13 can be made of a material with a certain degree of hardness and strength. This prevents deformation of the end cap 13 during compression and collision, thereby enhancing the structural strength and safety of the battery cell 20. The end cap 13 is provided with a conductive terminal 17, which is directly or indirectly connected to the tab of the electrode assembly 2 via an adapter 16 for inputting or outputting current. The end cap 13 can also be provided with a pressure relief mechanism 15 for relieving internal pressure in the battery cell 20 when the internal pressure or temperature reaches a threshold. The pressure relief mechanism 15 can be, but is not limited to, an explosion-proof valve. The end cap 13 can also be made of a variety of materials, such as copper, iron, aluminum, aluminum alloys, steel, titanium alloys, and copper alloys, and this embodiment of the present application does not impose any particular limitations on this. In some embodiments of the present application, an insulating structure may be provided inside the end cap 13 to isolate the electrical connection components in the accommodating cavity from the end cap 13 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, or the like.

[0114] "The edge of the first end is formed with a first thickened portion 113 that protrudes toward the accommodating groove relative to the inner side surface 117 and / or protrudes away from the accommodating groove relative to the outer side surface 118. Along the wall thickness direction of the main plate 11, the size of the first thickened portion 113 is greater than the distance between the inner side surface 117 and the outer side surface 118" means that the edge of the first end of the main plate 11 is locally thickened, and the thickened portion formed is the first thickened portion 113, and the inner surface and outer surface of the unthickened portion of the main plate 11 are the inner side surface 117 and the outer side surface 118 respectively. The unthickened portion of the main plate 11 is called the main body portion, and the distance between the inner side surface 117 and the outer side surface 118 along the wall thickness direction of the main plate 11 is the thickness of the main body portion. Therefore, the thickness of the first thickened portion 113 is greater than the thickness of the main body portion.

[0115] Optionally, along the direction in which the end cover 13 and the base plate 12 are spaced apart from each other (third direction Z), a portion of the edge of the first end of the main plate 11 forms a first thickened portion 113, or the entire edge of the first end of the main plate 11 forms a first thickened portion 113.

[0116] The end surface of the first thickened portion 113 in the wall thickness direction is as follows Figure 6 As the thickness of the first thickened portion 113 increases, the area of the end face F1 of the first thickened portion 113 in the wall thickness direction is increased, which is beneficial to increase the contact area between the first end and the second end of the main plate 11, reduce the probability of welding through, improve welding reliability, and thus improve the structural strength of the battery cell 20.

[0117] In some embodiments of the present application, Figure 6 As shown, the edge of the second end is formed with a second thickened portion 114 that protrudes toward the accommodating groove relative to the inner side surface 117 and / or protrudes away from the accommodating groove relative to the outer side surface 118. Along the wall thickness direction of the main body plate 11, the size of the second thickened portion 114 is greater than the distance between the inner side surface 117 and the outer side surface 118, and the end face of the second thickened portion 114 located in the wall thickness direction is welded to the end face of the first thickened portion 113 located in the wall thickness direction.

[0118] Optionally, along the direction in which the end cover 13 and the base plate 12 are spaced apart from each other (third direction Z), a portion of the edge of the second end of the main plate 11 forms a second thickened portion 114, or the entire edge of the second end of the main plate 11 forms a second thickened portion 114.

[0119] The edge of the second end of the main plate 11 is also partially thickened, forming a second thickened portion 114. That is, the main body of the main plate 11 is connected between the first thickened portion 113 and the second thickened portion 114. The thickness of the second thickened portion 114 is greater than that of the main body. The thickness of the first thickened portion 113 and the second thickened portion 114 can be the same or different.

[0120] The end surface of the second thickened portion 114 in the wall thickness direction is as follows Figure 6 As the thickness of the second thickened portion 114 increases, the area of the end face F2 of the second thickened portion 114 in the wall thickness direction is increased, and the end face F1 with a larger area is welded to the end face F2 with a larger surface area, further increasing the contact area between the first end and the second end of the main plate 11, reducing the probability of welding through, improving welding reliability, and thereby improving the structural strength of the battery cell 20.

[0121] In some embodiments of the present application, Figure 11 As shown, the end surface F1 of the first thickened portion 113 in the wall thickness direction is welded to the inner side surface 117 of the second end.

[0122] The end surface of the first thickened portion 113 in the wall thickness direction is as follows Figure 11 The increased thickness of the first thickened portion 113 increases the area of the end surface F1 of the first thickened portion 113 in the wall thickness direction. The inner side surface 117 of the second end of the main plate 11 has a relatively large area. Therefore, the contact area between the larger end surface F1 and the inner side surface 117 of the second end is larger, improving welding reliability, reducing the probability of weld penetration, and thereby enhancing the structural strength of the battery cell 20.

[0123] In some embodiments of the present application, Figure 12 and Figure 13As shown, an end edge of the main body plate 11 away from the end cover 13 is formed with a third thickened portion 115 that protrudes toward the accommodating groove relative to the inner side surface 117 and / or protrudes away from the accommodating groove relative to the outer side surface 118. Along the wall thickness direction of the main body plate 11, the size of the third thickened portion 115 is greater than the distance between the inner side surface 117 and the outer side surface 118, and the end surface of the third thickened portion 115 located in the wall thickness direction is welded to the surface of the bottom plate 12 facing the accommodating cavity.

[0124] Optionally, a third thickened portion 115 is formed on a portion of the edge of the main body plate 11 away from the end cover 13 along a direction surrounding the bottom plate 12, or a third thickened portion 115 is formed on the entire edge of the main body plate 11 away from the end cover 13 along a direction surrounding the bottom plate 12.

[0125] The end surface of the third thickened portion 115 in the wall thickness direction is as follows Figure 13 The increased thickness of the third thickened portion 115 increases the area of the end surface F3 of the third thickened portion 115 in the wall thickness direction. The surface of the bottom plate 12 facing the accommodating cavity is relatively large. Therefore, the larger end surface F3 and the inner surface of the bottom plate 12 have a larger contact area, reducing the probability of weld penetration, improving welding reliability, and thereby enhancing the structural strength of the battery cell 20.

[0126] In some embodiments of the present application, the first end and the second end of the main body plate 11 are welded together by penetration welding to form a first weld 116 .

[0127] like Figure 7 As shown, the first thickened portion 113 at the first end and the second thickened portion 114 at the second end are welded by penetration welding, and the welding is firm, thereby improving the structural strength of the battery cell 20.

[0128] In some embodiments of the present application, Figure 3 and Figure 4 As shown, the main plate 11 includes two first plates 111 opposite to each other along a first direction X and perpendicular to the first direction X, and two second plates 112 opposite to each other along a second direction Y and perpendicular to the second direction Y. The two ends of each first plate 111 are respectively connected to the two second plates 112. The bottom plate 12 and the end cover 13 are opposite to each other along a third direction Z and are both perpendicular to the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0129] In this way, the formed housing 1 is a cubic shell, that is, the battery cell 20 is a square-shell battery, and the square-shell battery has high structural strength.

[0130] In some embodiments of the present application, Figure 3 and Figure 4As shown, the dimension of the first plate 111 along the second direction Y is greater than the dimension of the second plate 112 along the first direction X, and the first weld 116 formed by welding the first end and the second end is located on the second plate 112 .

[0131] In this way, the outer surface of the first plate 111 is the large surface of the battery cell 20, the outer surface of the second plate 112 is the side surface of the battery cell 20, and the first weld 116 formed by welding the first end and the second end of the main plate 11 is located on the side surface of the battery cell 20 with a smaller area, which is beneficial to improving the structural strength of the battery cell 20.

[0132] For example, the end surface F1 of the first thickened portion 113 in the wall thickness direction is welded to the end surface F2 of the second thickened portion 114 in the wall thickness direction, and the formed first weld 116 is located at a non-edge portion of the second plate 112. Alternatively, the end surface F1 of the first thickened portion 113 in the wall thickness direction is welded to the inner side surface 117 of the second end, and the formed first weld 116 is located at the edge of the second plate 112.

[0133] In some embodiments of the present application, Figure 12 、 Figure 14 and Figure 15 As shown, the accommodating cavity accommodates more than one electrode assembly 2, and the electrode assembly 2 is a winding structure. The electrode assembly 2 includes interconnected bending sections 21 and straight sections 22. The stacking direction of the straight sections 22 is the thickness direction S of the electrode assembly 2, and the thickness direction S of the electrode assembly 2 is consistent with the first direction X.

[0134] In this way, the electrode assembly 2 is accommodated in the accommodation cavity in a suitable orientation, and more electrode assemblies 2 can be accommodated in the accommodation cavity with a fixed volume, which is beneficial to improving the volume energy density of the battery cell 20.

[0135] In some embodiments of the present application, at least two electrode assemblies 2 are arranged along a first direction X, the winding axis of the electrode assembly 2 is consistent with the third direction Z, and along the second direction Y, the first weld 116 corresponds to the joining seam of two adjacent electrode assemblies 2; or, the first weld 116 is located at the edge of either end of the second plate 112 along the first direction X.

[0136] For example, Figure 15 As shown, the thickness direction S of the electrode assembly 2 is consistent with the first direction X, the winding axis of the electrode assembly 2 is consistent with the third direction Z, and the first weld 116 corresponds to the joint seam between two adjacent electrode assemblies 2, so that the first weld 116 avoids the portion of the bent section 21 of the electrode assembly 2 closest to the main plate 11. In this case, the first weld 116 is located at a non-edge position of the second plate 112. In particular, when two electrode assemblies 2 are accommodated in the accommodating cavity, the first weld 116 is located in the middle of the second plate 112 along the first direction X.

[0137] Exemplarily, the thickness direction S of the electrode assembly 2 is consistent with the first direction X, the winding axis of the electrode assembly 2 is consistent with the third direction Z, and the first weld 116 is located at the edge of either end of the second plate 112 along the first direction X, so that the first weld 116 avoids the part of the bending section 21 of the electrode assembly 2 closest to the main plate 11. In this case, the first weld 116 is located at the edge of the second plate 112.

[0138] In this way, the housing 1 does not need to increase the volume of the accommodating cavity to accommodate the electrode assembly 2 due to the formation of the first thickened portion 113 , thereby improving the structural strength of the battery cell 20 without affecting the volume energy density.

[0139] In some embodiments of the present application, Figure 12 and Figure 13 As shown, the winding axis of the electrode assembly 2 is consistent with the second direction Y, and the edge of the end of the first plate 111 away from the end cover 13 is formed with a third thickened portion 115 protruding relative to the inner side surface 117 facing the accommodating groove. Along the wall thickness direction of the first plate 111, the size of the third thickened portion 115 is greater than the distance between the inner side surface 117 and the outer side surface 118, and the end face of the third thickened portion 115 in the wall thickness direction is welded to the surface of the bottom plate 12 facing the accommodating cavity.

[0140] A second weld 119 is formed by welding the end face F3 of the third thickened portion 115 in the wall thickness direction to the surface of the bottom plate 12 facing the accommodating cavity. The second weld 119 is located at the edge of the end of the first plate 111 away from the end cover 13. The second weld 119 avoids the part of the bending section 21 of the electrode assembly 2 that is closest to the main plate 11 or the bottom plate 12.

[0141] In this way, the housing 1 does not need to increase the volume of the accommodating cavity to accommodate the electrode assembly 2 due to the formation of the third thickened portion 115 , thereby improving the structural strength of the battery cell 20 without affecting the volume energy density.

[0142] In some embodiments of the present application, the winding axis of the electrode assembly 2 is consistent with the second direction Y, and the edge of the end of the second plate 112 away from the end cover 13 is formed with a third thickened portion 115 protruding relative to the inner side surface 117 facing the accommodating groove. Along the wall thickness direction of the second plate 112, the size of the third thickened portion 115 is greater than the distance between the inner side surface 117 and the outer side surface 118, and the end face of the third thickened portion 115 located in the wall thickness direction is welded to the surface of the bottom plate 12 facing the accommodating cavity.

[0143] In this way, the contact area between the second plate 112 and the bottom plate 12 is larger, thereby improving welding reliability and reducing the probability of welding through.

[0144] It is understood that the inner surfaces of the first and second plates 111 and 112 where the first, second, and third thickened portions 113, 114, and 115 are not formed constitute the inner side surface 117 of the main plate 11. The outer surfaces of the first and second plates 111 and 112 where the first, second, and third thickened portions 113, 114, and 115 are not formed constitute the outer side surface 118 of the main plate 11.

[0145] In some embodiments of the present application, Figure 6 As shown, the distance L1 between the inner side surface 117 and the outer side surface 118 along the wall thickness direction of the main body plate 11 is in the range of 0.075 mm to 0.4 mm.

[0146] The distance L1 between the inner side surface 117 and the outer side surface 118 along the wall thickness direction of the main body plate 11 is the wall thickness of the main body portion of the main body plate 11. For example, the distance L1 between the inner side surface 117 and the outer side surface 118 along the wall thickness direction of the main body plate 11 can be, but is not limited to, 0.075 mm, 0.1 mm, 0.125 mm, 0.15 mm, 0.175 mm, 0.2 mm, 0.225 mm, 0.25 mm, 0.275 mm, 0.3 mm, 0.325 mm, 0.35 mm, 0.375 mm, or 0.4 mm.

[0147] In this way, by limiting the wall thickness of the main body portion of the main plate 11 to the range of 0.075 mm to 0.4 mm, the main plate 11 is made thinner, which is beneficial for reducing the volume of the battery cell 20 and improving the volume energy density of the battery cell 20 .

[0148] In some embodiments of the present application, Figure 6 As shown, the distance between the inner side surface 117 and the outer side surface 118 along the wall thickness direction of the main body plate 11 is in the range of 0.1 mm to 0.25 mm.

[0149] Illustratively, the spacing L1 between the inner side surface 117 and the outer side surface 118 along the wall thickness direction of the main plate 11 can be but is not limited to 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, 0.15mm, 0.16mm, 0.17mm, 0.18mm, 0.19mm, 0.2mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm.

[0150] In this way, by limiting the wall thickness of the main body portion of the main plate 11 to the range of 0.1 mm to 0.25 mm, the main plate 11 is made thinner, which is beneficial for reducing the volume of the battery cell 20 and improving the volume energy density of the battery cell 20 .

[0151] In some embodiments of the present application, Figure 6As shown, the dimension L2 of the first thickened portion 113 along the wall thickness direction of the main plate 11 is in the range of 0.15 mm to 2 mm.

[0152] A dimension L2 of the first thickened portion 113 along the wall thickness direction of the main plate 11 is the wall thickness of the first thickened portion 113 . Exemplarily, the wall thickness of the first thickened portion 113 can be, but is not limited to, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, 1.55mm, 1.6mm, 1.65mm, 1.7mm, 1.75mm, 1.8mm, 1.85mm, 1.9mm, 1.95mm, or 2mm.

[0153] In this way, by limiting the thickness of the first thickened portion 113 to the range of 0.15 mm to 2 mm, the welding reliability is improved, the probability of welding through is reduced, and the structural strength is improved, while the volume energy density of the battery cell 20 is not affected due to excessive thickness.

[0154] In some embodiments of the present application, Figure 6 As shown, the dimension L3 of the second thickened portion 114 along the wall thickness direction of the main plate 11 is in the range of 0.15 mm to 2 mm.

[0155] A dimension L3 of the second thickened portion 114 along the wall thickness direction of the main plate 11 is the wall thickness of the second thickened portion 114 . Exemplarily, the wall thickness of the second thickened portion 114 can be, but is not limited to, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, 1.55mm, 1.6mm, 1.65mm, 1.7mm, 1.75mm, 1.8mm, 1.85mm, 1.9mm, 1.95mm, or 2mm.

[0156] In this way, by limiting the thickness of the second thickened portion 114 to the range of 0.15 mm to 2 mm, the probability of welding through is reduced, the reliability of welding is improved, and the structural strength is increased, while the volume energy density of the battery cell 20 is not affected due to excessive thickness.

[0157] In some embodiments of the present application, Figure 13 As shown, the dimension L4 of the third thickened portion 115 along the wall thickness direction of the main plate 11 is in the range of 0.15 mm to 2 mm.

[0158] A dimension L4 of the third thickened portion 115 along the wall thickness direction of the main plate 11 is the wall thickness of the third thickened portion 115 . Exemplarily, the wall thickness of the third thickened portion 115 can be, but is not limited to, 0.15mm, 0.2mm, 0.25mm, 0.3mm, 0.35mm, 0.4mm, 0.45mm, 0.5mm, 0.55mm, 0.6mm, 0.65mm, 0.7mm, 0.75mm, 0.8mm, 0.85mm, 0.9mm, 0.95mm, 1mm, 1.05mm, 1.1mm, 1.15mm, 1.2mm, 1.25mm, 1.3mm, 1.35mm, 1.4mm, 1.45mm, 1.5mm, 1.55mm, 1.6mm, 1.65mm, 1.7mm, 1.75mm, 1.8mm, 1.85mm, 1.9mm, 1.95mm, or 2mm.

[0159] In this way, by limiting the thickness of the third thickened portion 115 to the range of 0.15 mm to 2 mm, the probability of welding through is reduced, the reliability of welding is improved, and the structural strength is increased, while the volume energy density of the battery cell 20 is not affected due to excessive thickness.

[0160] In some embodiments of the present application, the edge of the first end of the main body plate 11 is bent toward the inside or outside of the accommodating cavity to form a first thickened portion 113 .

[0161] In this way, the first thickened portion 113 is formed by bending, so that the main body plate 11 can be made of a straight plate, which is easy to manufacture and has low manufacturing cost.

[0162] In some embodiments of the present application, the edge of the second end of the main body plate 11 is bent toward the inside or outside of the accommodating cavity to form a second thickened portion 114 .

[0163] In this way, the second thickened portion 114 is formed by bending, so that the main body plate 11 can be made of a straight plate, which is easy to manufacture and has low manufacturing cost.

[0164] In some embodiments of the present application, an edge of one end of the main body plate 11 away from the end cover 13 is bent toward the inside and / or outside of the accommodating cavity to form a third thickened portion 115 .

[0165] In this way, the third thickened portion 115 is formed by bending, so that the main body plate 11 can be made of a straight plate, which is easy to manufacture and has low manufacturing cost.

[0166] In some embodiments of the present application, the bending angle is in the range of 60° to 120°.

[0167] The first thickened portion 113, the second thickened portion 114, or the third thickened portion 115 is bent at an angle within a range of 60° to 120°. For example, the bending angle may be, but is not limited to, 60°, 65°, 70°, 75°, 80°, 85°, 90°, 95°, 100°, 105°, 110°, 115°, or 120°.

[0168] In this way, by limiting the bending angle to the range of 60° to 120°, the first thickened portion 113 , the second thickened portion 114 or the third thickened portion 115 with appropriate thickness and stable structure can be formed.

[0169] In some embodiments of the present application, Figure 16 As shown, one of the end surface of the first thickened portion 113 in the wall thickness direction and the surface of the second end is formed with a recessed portion, and the other is formed with a protruding portion 1141 , which penetrates into the recessed portion.

[0170] Optionally, one of the end surface of the first thickened portion 113 in the wall thickness direction and the end surface of the second thickened portion 114 in the wall thickness direction is formed with a recessed portion, and the other is formed with a protrusion 1141, and the protrusion 1141 penetrates into the recessed portion. Alternatively, one of the end surface of the first thickened portion 113 in the wall thickness direction and the inner side surface 117 of the second end is formed with a recessed portion, and the other is formed with a protrusion 1141, and the protrusion 1141 penetrates into the recessed portion.

[0171] The cooperation between the recessed portion and the protruding portion 1141 increases the contact area between the first end and the second end, thereby improving the welding effect.

[0172] In some embodiments of the present application, more than two recessed portions are provided, and more than two protruding portions 1141 are provided, and the recessed portions and the protruding portions 1141 are matched one-to-one.

[0173] In some embodiments of the present application, the material of the base plate 12 is any one of steel, iron, and hard polymer materials; and / or the material of the main plate 11 is any one of steel, iron, and hard polymer materials; and / or the material of the end cover 13 is any one of steel, iron, and hard polymer materials.

[0174] The hard polymer material includes at least one of polyvinyl chloride, polyethylene, polypropylene, polyoxymethylene, polyvinylidene fluoride, hexafluoropropylene-vinylidene fluoride copolymer, tetrafluoropropylene-vinylidene fluoride copolymer, trifluorochloropropylene-vinylidene fluoride copolymer, polyethylene terephthalate, polyamide, polyimide, polyetherimide, polycarbonate, polystyrene, polyphenylene sulfide, polyvinylidene fluoride, polyvinylidene fluoride copolymer, polyarylate, and fiber.

[0175] Thus, the bottom plate 12, main plate 11, or end cap 13 made of the above materials have high structural strength, which helps to improve the structural strength of the battery cell 20. In addition, the bottom plate 12, main plate 11, or end cap 13 can be set relatively thin, which helps to improve the volume energy density of the battery cell 20.

[0176] In some embodiments of the present application, Figure 17 As shown, the inner surface of the main body plate 11 is provided with reinforcing ribs 14 .

[0177] Exemplarily, reinforcing ribs 14 are provided on the inner surface of the first plate 111 and / or the second plate 112 .

[0178] By providing the reinforcing ribs 14 on the inner surface of the main body plate 11 , the structural strength of the main body plate 11 can be improved, thereby further improving the structural strength of the battery cell 20 .

[0179] Exemplarily, the reinforcing ribs 14 are welded to the inner surface of the main body plate 11 , or the reinforcing ribs 14 and the main body plate 11 are integrally formed.

[0180] In some embodiments of the present application, the dimension of the reinforcing rib 14 along the wall thickness direction of the main plate 11 is in the range of 0.1 mm to 1 mm.

[0181] The dimension of the reinforcing rib 14 along the wall thickness direction of the main plate 11 is the thickness of the reinforcing rib 14. For example, the thickness of the reinforcing rib 14 can be, but is not limited to, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm.

[0182] In this way, by limiting the thickness of the reinforcing ribs 14 to the range of 0.1 mm to 1 mm, the structural strength of the main plate 11 is improved, and the influence of the provision of the reinforcing ribs 14 on the volume energy density of the battery cell 20 is reduced.

[0183] In some embodiments of the present application, Figure 17 As shown, the reinforcing ribs 14 extend along a straight line and are provided with at least two, at least two of all the reinforcing ribs 14 are parallel to each other; and / or at least two of all the reinforcing ribs 14 cross each other.

[0184] In this way, by providing a plurality of intersecting and / or parallel reinforcing ribs 14 , the structural strength of the main plate 11 is further improved, thereby further improving the volume energy density of the battery cell 20 .

[0185] In some embodiments of the present application, the reinforcing rib 14 extends along a curve.

[0186] In some embodiments of the present application, Figure 17 As shown, at least one reinforcing rib 14 provided on the inner surface of the first plate 111 extends along the third direction Z.

[0187] In this way, the structural strength of the main body plate 11 in the third direction Z is improved, and the supporting strength for the end cover 13 is improved.

[0188] In some embodiments of the present application, Figure 17 As shown, the ratio of the length of the reinforcing rib 14 extending along the third direction Z to the dimension of the first plate 111 along the third direction Z is in the range of 0.01% to 100%.

[0189] Exemplarily, the ratio of the length of the reinforcing rib 14 extending along the third direction Z to the dimension of the first plate 111 along the third direction Z can be, but is not limited to, 0.01%, 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, or 100%.

[0190] In some embodiments of the present application, Figure 17 As shown, the ratio of the length of the reinforcing rib 14 extending along the third direction Z to the dimension of the first plate 111 along the third direction Z is in the range of 40% to 80%.

[0191] Exemplarily, the ratio of the length of the reinforcement rib 14 extending along the third direction Z to the dimension of the first plate 111 along the third direction Z can be but is not limited to 40%, 41%, 42%, 43%, 44%, 45%, 46%, 47%, 48%, 49%, 50%, 51%, 52%, 53%, 54%, 55%, 56%, 57%, 58%, 59%, 60%, 61%, 62%, 63%, 64%, 65%, 66%, 67%, 68%, 69%, 70%, 71%, 72%, 73%, 74%, 75%, 76%, 77%, 78%, 79%, 80%.

[0192] In some embodiments of the present application, a ratio of a dimension of the reinforcing rib 14 extending along the third direction Z in the second direction Y to a dimension of the first plate 111 in the second direction Y is in a range of 0.01% to 10%.

[0193] The dimension of the reinforcing rib 14 extending along the third direction Z in the second direction Y is the width of the reinforcing rib 14 extending along the third direction Z. For example, the ratio of the dimension of the reinforcing rib 14 extending along the third direction Z in the second direction Y to the dimension of the first plate 111 in the second direction Y may be, but is not limited to, 0.01%, 0.1%, 0.5%, 1%, 1.1%, 1.2%, 1.3%, 1.4%, 1.5%, 1.6%, 1.7%, 1.8%, 1.9%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, 5.5%, 6%, 6.5%, 7%, 7.5%, 8%, 8.5%, 9%, 9.5%, or 10%.

[0194] In some embodiments of the present application, a ratio of a dimension of the reinforcing rib 14 extending along the third direction Z in the second direction Y to a dimension of the first plate 111 in the second direction Y is in a range of 0.1% to 1%.

[0195] Exemplarily, the ratio of the dimension of the reinforcing rib 14 extending along the third direction Z in the second direction Y to the dimension of the first plate 111 in the second direction Y can be, but is not limited to, 0.1%, 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%, or 1%.

[0196] In some embodiments of the present application, Figure 18 As shown, the surface of the bottom plate 12 facing the receiving cavity is provided with reinforcement ribs 14 .

[0197] In this way, the structural strength of the bottom plate 12 is improved, thereby further improving the structural strength of the battery cell 20 .

[0198] In some embodiments of the present application, Figure 19 As shown, the surface of the end cover 13 facing the accommodating cavity is provided with reinforcing ribs 14 .

[0199] In this way, the structural strength of the end cover 13 is improved, thereby further improving the structural strength of the battery cell 20 .

[0200] In some embodiments of the present application, the size of the shell 1 along the first direction X is in the range of 10mm to 100mm, the size of the shell 1 along the second direction Y is in the range of 200mm to 600mm, and the size of the shell 1 along the third direction Z is in the range of 200mm to 500mm.

[0201] The dimension of the housing 1 along the first direction X is the distance between the outer surfaces of the two first plates 111. For example, the dimension of the housing 1 along the first direction X may be, but is not limited to, 10 mm, 15 mm, 20 mm, 25 mm, 30 mm, 35 mm, 40 mm, 45 mm, 50 mm, 55 mm, 60 mm, 65 mm, 70 mm, 75 mm, 80 mm, 85 mm, 90 mm, 95 mm, or 100 mm.

[0202] The size of the shell 1 along the second direction Y is the distance between the outer surfaces of the two second plates 112. For example, the size of the shell 1 along the second direction Y can be but is not limited to 200mm, 250mm, 300mm, 350mm, 400mm, 450mm, 500mm, 550mm, 600mm.

[0203] The dimension of the housing 1 along the third direction Z is the distance between the outer surface of the end cover 13 and the outer surface of the bottom plate 12. For example, the dimension of the housing 1 along the third direction Z can be, but is not limited to, 200 mm, 250 mm, 300 mm, 350 mm, 400 mm, 450 mm, or 500 mm.

[0204] A second aspect of the present application provides a battery device, which includes a plurality of battery cells 20 provided according to the first aspect.

[0205] Since the battery device includes the battery cell 20 provided in the first aspect, and the battery cell 20 has high structural strength, the battery device also has high structural strength.

[0206] In some embodiments, the battery device may be a battery pack 100 , which includes a battery case 10 and one or more battery cells 20 . The battery cells 20 are housed in the battery case 10 .

[0207] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0208] A third aspect of the present application provides an electrical device, comprising the battery cell 20 provided according to the first aspect or the battery device provided according to the second aspect.

[0209] Since the battery device includes the battery cell 20 provided in the first aspect or the battery device provided in the second aspect, and the battery cell 20 and the battery device have high structural strength, the electrical device also has high structural strength.

[0210] Below, some specific examples of embodiments of the present application are described with reference to the accompanying drawings.

[0211] As a specific example, a battery cell 20 is provided, which includes a bent shell body (main body plate 11), a bottom cover plate (bottom plate 12) and a top cover plate (end cover 13). The bent shell body is formed by bending a straight plate around the circumference of the bottom cover plate. The head and tail ends of the bent shell body are bent inward to form bent edges (a first thickened portion 113 and a second thickened portion 114). The two bent edges are relatively merged and welded, so that the bent shell body forms a sleeve-like structure with closed four sides and openings at both ends. The bottom cover plate is closed at one end opening of the bent shell body, and the top cover plate is closed at the other end opening of the bent shell body. The bent shell body, the bottom cover plate and the top cover plate form a accommodating cavity, and the accommodating cavity accommodates at least one electrode assembly (electrode assembly 2).

[0212] The above embodiments are intended only to illustrate the technical solutions of the present application, and are not intended to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they may still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. Such modifications or replacements do not deviate from the essence of the corresponding technical solutions within the scope of the technical solutions of the embodiments of the present application, and they should all be included within the scope of the specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments may be combined in any manner.

Claims

1. A battery cell, characterized in that: It comprises a housing having a receiving cavity and an electrode assembly received in the receiving cavity; The housing comprises: base plate; a main body plate, the main body plate surrounding the bottom plate and forming a receiving groove with the bottom plate, the surface of the main body plate facing the receiving groove including an inner side surface, the surface of the main body plate facing away from the receiving groove including an outer side surface, the two ends of the main body plate along the circumference of the bottom plate being respectively a first end and a second end, an edge of the first end being formed with a first thickened portion protruding relative to the inner side surface facing the receiving groove and / or protruding relative to the outer side surface facing away from the receiving groove, along the wall thickness direction of the main body plate, a size of the first thickened portion being larger than the distance between the inner side surface and the outer side surface, the first end being welded to the second end via an end surface of the first thickened portion located in the wall thickness direction, and the receiving groove having an opening opposite to the bottom plate; The end cover closes the opening and forms the accommodating cavity together with the main plate and the bottom plate.

2. The battery cell according to claim 1, wherein: The edge of the second end is formed with a second thickened portion that protrudes toward the accommodating groove relative to the inner side surface and / or protrudes away from the accommodating groove relative to the outer side surface. Along the wall thickness direction of the main body plate, the size of the second thickened portion is greater than the distance between the inner side surface and the outer side surface, and the end surface of the second thickened portion located in the wall thickness direction is welded to the end surface of the first thickened portion located in the wall thickness direction.

3. The battery cell according to claim 1, wherein: An end surface of the first thickened portion in the wall thickness direction is welded to the inner side surface of the second end.

4. The battery cell according to claim 1, wherein: A third thickened portion is formed on an end edge of the main body plate away from the end cover, which protrudes relative to the inner side surface facing the accommodating groove and / or protrudes relative to the outer side surface facing away from the accommodating groove. Along the wall thickness direction of the main body plate, the size of the third thickened portion is greater than the distance between the inner side surface and the outer side surface, and the end surface of the third thickened portion located in the wall thickness direction is welded to the surface of the bottom plate facing the accommodating cavity.

5. The battery cell according to claim 2, characterized in that: A third thickened portion is formed on an end edge of the main body plate away from the end cover, which protrudes relative to the inner side surface facing the accommodating groove and / or protrudes relative to the outer side surface facing away from the accommodating groove. Along the wall thickness direction of the main body plate, the size of the third thickened portion is greater than the distance between the inner side surface and the outer side surface, and the end surface of the third thickened portion located in the wall thickness direction is welded to the surface of the bottom plate facing the accommodating cavity.

6. The battery cell according to claim 3, characterized in that A third thickened portion is formed on an end edge of the main body plate away from the end cover, which protrudes relative to the inner side surface facing the accommodating groove and / or protrudes relative to the outer side surface facing away from the accommodating groove. Along the wall thickness direction of the main body plate, the size of the third thickened portion is greater than the distance between the inner side surface and the outer side surface, and the end surface of the third thickened portion located in the wall thickness direction is welded to the surface of the bottom plate facing the accommodating cavity.

7. The battery cell according to any one of claims 1 to 6, characterized in that: The main body plate includes two first plates opposite to each other along a first direction and perpendicular to the first direction and two second plates opposite to each other along a second direction and perpendicular to the second direction. The two ends of each first plate are respectively connected to the two second plates. The bottom plate and the end cover are opposite to each other along a third direction and are both perpendicular to the third direction. The first direction, the second direction and the third direction are perpendicular to each other.

8. The battery cell according to claim 7, characterized in that A dimension of the first plate along the second direction is greater than a dimension of the second plate along the first direction, and a first weld formed by welding the first end and the second end is located on the second plate.

9. The battery cell according to claim 8, characterized in that The accommodating cavity accommodates one or more electrode assemblies, wherein the electrode assemblies are of a wound structure and comprise interconnected bent segments and straight segments, wherein the stacking direction of the straight segments is the thickness direction of the electrode assembly. The thickness direction of the electrode assembly is consistent with the first direction.

10. The battery cell according to claim 9, characterized in that The electrode assembly is arranged along the first direction, and the winding axis of the electrode assembly is consistent with the third direction. Along the second direction, the first weld corresponds to a joint seam between two adjacent electrode assemblies; or The first weld is located at an edge of either end of the second plate along the first direction.

11. The battery cell according to claim 9, characterized in that The winding axial direction of the electrode assembly is consistent with the second direction, A third thickened portion is formed on an end edge of the first plate away from the end cover, protruding relative to the inner side surface facing the accommodating groove. Along the wall thickness direction of the first plate, the size of the third thickened portion is greater than the distance between the inner side surface and the outer side surface, and the end surface of the third thickened portion located in the wall thickness direction is welded to the surface of the bottom plate facing the accommodating cavity.

12. The battery cell according to any one of claims 1 to 6 and 8 to 11, characterized in that: The distance between the inner side surface and the outer side surface along the wall thickness direction of the main body plate is in the range of 0.075 mm to 0.4 mm.

13. The battery cell according to any one of claims 1 to 6 and 8 to 11, characterized in that: The distance between the inner side surface and the outer side surface along the wall thickness direction of the main body plate is in the range of 0.1 mm to 0.25 mm.

14. The battery cell according to any one of claims 1 to 6 and 8 to 11, characterized in that: The edge of the first end of the main body plate is bent toward the inside or outside of the accommodating cavity to form the first thickened portion.

15. The battery cell according to claim 2, characterized in that The edge of the second end of the main body plate is bent toward the inside or outside of the accommodating cavity to form the second thickened portion.

16. The battery cell according to any one of claims 4 to 6 and 11, characterized in that: An edge of one end of the main body plate away from the end cover is bent toward the inner side and / or the outer side of the accommodating cavity to form the third thickened portion.

17. The battery cell according to claim 14, characterized in that The bending angle is within the range of 60° to 120°.

18. The battery cell according to claim 15, characterized in that The bending angle is within the range of 60° to 120°.

19. The battery cell according to claim 16, characterized in that The bending angle is within the range of 60° to 120°.

20. The battery cell according to any one of claims 1 to 6, 8 to 11, 15, and 17 to 19, characterized in that: The dimension of the first thickened portion along the wall thickness direction of the main plate is in the range of 0.15 mm to 2 mm.

21. The battery cell according to claim 2 or 15, characterized in that: The dimension of the second thickened portion along the wall thickness direction of the main plate is in the range of 0.15 mm to 2 mm.

22. The battery cell according to any one of claims 4 to 6 and 11, characterized in that: The dimension of the third thickened portion along the wall thickness direction of the main plate is in the range of 0.15 mm to 2 mm.

23. The battery cell according to any one of claims 1 to 6, 8 to 11, 15, and 17 to 19, characterized in that: One of the end surface of the first thickened portion in the wall thickness direction and the surface of the second end is formed with a recessed portion, and the other is formed with a protruding portion, and the protruding portion penetrates into the recessed portion.

24. The battery cell according to any one of claims 1 to 6, 8 to 11, 15, and 17 to 19, characterized in that: The base plate is made of any one of steel, iron, and hard polymer materials; and / or The material of the main body plate is any one of steel, iron, and hard polymer material; and / or The material of the end cover is any one of steel, iron and hard polymer material.

25. The battery cell according to any one of claims 1 to 6, 8 to 11, 15, and 17 to 19, characterized in that: The inner surface of the main body plate is provided with reinforcing ribs.

26. A battery device, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 25.

27. An electrical device, characterized in that: The method comprises the battery cell according to any one of claims 1 to 25 or the battery device according to claim 26.

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