Battery monomer, battery device and electric equipment

Abstract

The utility model relates to a battery monomer, a battery device and electric equipment, the battery monomer comprises a shell, an end cover, at least one electrode assembly and an adapter, at least one end of each electrode assembly along a first direction is provided with a tab, and the tabs located at the same end are converged and folded to form a folded and folded area; the adapter comprises a first connecting area, a bending area and a second connecting area which are connected in sequence, the second connecting area is used for being electrically connected with the electrode terminal, the first connecting area is used for being electrically connected with the folding and folding area, and the first connecting area and the second connecting area are connected in a foldable mode in the first direction through the bending area; on a plane perpendicular to the first direction, the projection of the folding area and the projection of the bending area are arranged at intervals. According to the battery monomer, the battery device and the electric equipment, the situation that the space in the length direction is excessively occupied due to the fact that the folding and folding areas and the bending areas of the tabs are stacked can be improved, the space utilization rate of the battery monomer in the length direction is improved, and the volume energy density of the battery monomer is favorably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device and an electric equipment. BACKGROUND

[0002] With the popularization and promotion of new energy vehicles, the charging and discharging performance, endurance capability and the like of new energy vehicles are increasingly attracting people's attention and attention. Batteries, as the power energy of new energy vehicles, are widely used.

[0003] At present, in the assembly process of the battery, the tab is usually gathered and collected and then bent, and then the adapter is electrically connected with the electrode terminal of the top cover, that is, the tab is folded on the top side of the battery monomer. In the assembly mode of the tab folded on the top side, the height direction space occupied by the bent tab is multiplied due to the large thickness of the tab layer, and the adapter is further stacked on the top of the bent tab, which will further occupy the height direction space of the battery monomer, resulting in low internal space utilization and battery capacity of the battery. Practical new type content

[0004] Therefore, it is necessary to provide a battery monomer, a battery device and an electric equipment in view of the problem of low internal space utilization and battery capacity of the existing battery.

[0005] A battery cell includes a shell, an end cover, at least one electrode assembly, and an adapter, the shell is provided with an opening at at least one end in a first direction, the first direction is the length direction of the battery cell, the end cover covers the opening of the shell, the end cover is provided with an electrode terminal, each electrode assembly is arranged in the shell, and the adapter is used for electrically connecting each electrode assembly and the electrode terminal; wherein each electrode assembly is provided with a tab at at least one end in the first direction, each tab located at the same end is converged and forms a converged folding area; the adapter includes a first connecting area, a bending area and a second connecting area connected in sequence, the second connecting area is used for electrically connecting the electrode terminal, the first connecting area is used for electrically connecting the converged folding area, and the first connecting area and the second connecting area are foldably connected in the first direction through the bending area; in a plane perpendicular to the first direction, the projection of the converged folding area and the projection of the bending area are arranged in a spaced manner. The battery cell described above, the adapter is divided into the first connecting area, the bending area and the second connecting area, the two connecting areas are foldably connected in the first direction (i.e. the length direction) through the bending area, and the two connecting areas are electrically connected with the converged folding area of the tab and the electrode terminal on the end cover respectively, that is, the traditional tab folding mode at the top side of the battery cell is replaced by the tab folding mode at the end side, the space in the length direction of the battery cell is fully utilized, and the height space required for tab folding is reduced; in the plane perpendicular to the first direction, the projection of the converged folding area and the projection of the bending area have no overlapping part, the space occupied in the length direction due to the laminated arrangement of the converged folding area of the tab and the bending area can be improved, the space utilization rate of the battery cell in the length direction is improved, and the volume energy density of the battery cell is improved.

[0006] In some embodiments, the bending area is an arc-shaped groove structure protruding outward at one end in the second direction. In this way, the bending area of the adapter is arc-shaped, so that the bending area of the adapter does not have sharp corners, reducing the probability of damage to the tab connected to the adapter due to the presence of sharp corners in the bending area, and facilitating subsequent adjustment of the bending angle of the bending area.

[0007] In some embodiments, in the first direction, the inner diameter of the arc-shaped groove structure ranges from 1mm to 10mm. In this way, by limiting the inner diameter range of the arc-shaped groove structure, the bending area does not occupy too much space in the first direction, thereby affecting the volume energy density, and at the same time, sufficient space is provided for the connection of the first connecting area and the second connecting area with other components.

[0008] In some embodiments, the inner diameter of the arc-shaped groove structure ranges from 3mm to 6mm. In this way, by limiting the inner diameter of the arc-shaped groove structure to an optimal range, the space occupied by the bending area in the first direction is further optimized, and the space provided for the connection of the first connecting area and the second connecting area with other components is further optimized.

[0009] In some embodiments, the depth of the arc-shaped groove structure ranges from 0.1mm to 3mm in the second direction. In this way, by limiting the depth of the arc-shaped groove structure, the bending area does not occupy too much space in the second direction, and the influence on the volumetric energy density is reduced.

[0010] In some embodiments, the depth of the arc-shaped groove structure ranges from 0.5mm to 1.5mm. In this way, by limiting the depth of the arc-shaped groove structure to an optimal range, the space occupied by the bending area in the second direction is further optimized, and the influence on the volumetric energy density is further optimized.

[0011] In some embodiments, the wall thickness of the arc-shaped groove structure ranges from 0.2mm to 5mm. In this way, by limiting the wall thickness of the arc-shaped groove structure, the hardness of the bending area is appropriate, and the probability of fracture or deformation of the bending area is reduced.

[0012] In some embodiments, the wall thickness of the arc-shaped groove structure ranges from 0.5mm to 1.2mm. In this way, by limiting the wall thickness of the arc-shaped groove structure to an optimal range, the hardness of the bending area is further optimized, and the bending area is not prone to fracture or deformation.

[0013] In some embodiments, the bending area is a foil structure capable of elastic deformation and electrical conduction. In this way, the bending area is a foil structure capable of elastic deformation and electrical conduction, which can make the bending area have electrical conduction and overcurrent performance, and reduce the probability of fracture or deformation of the bending area.

[0014] In some embodiments, the foil structure includes at least two foil sheets, and each foil sheet is stacked in the same direction. In this way, the appropriate number of foil sheets can be selected according to the actual situation, so that the mechanical strength of the bending area meets the requirements, and at the same time the bending area can have sufficient overload capacity.

[0015] In some embodiments, the thickness of each foil sheet ranges from 0.01mm to 0.5mm. In this way, by limiting the thickness of each foil sheet, the mechanical strength of the bending area is appropriate, and the probability of fracture or deformation of the bending area is reduced.

[0016] In some embodiments, in the third direction, the width of the first connecting area and the width of the second connecting area are equal, the width of each foil sheet is greater than or equal to the width of the second connecting area, and the width of each foil sheet is less than the width of the end cover, and the third direction, the first direction and the second direction are intersected with each other and not coplanar. In this way, in the third direction, each foil sheet can exceed the second connecting area and not exceed the end cover, so that each foil sheet does not occupy space in the third direction, and at the same time the width of each foil sheet meets the requirement of overload capacity.

[0017] In some embodiments, the length of each foil is 1mm-60mm. In this way, by limiting the length range of each foil, the length of each foil before bending is neither too short nor too long, and after bending, the size requirement can be met.

[0018] In some embodiments, the length of each foil is 1mm-30mm. In this way, by limiting the length of each foil to an optimal range, the size of each foil before and after bending can be optimized.

[0019] In some embodiments, the thickness of the first connecting area and the thickness of the second connecting area are equal, and the thickness of the bending area is greater than or equal to the thickness of the second connecting area. In this way, the thickness of the bending area is greater than or equal to the thickness of the second connecting area, which can meet the thickness requirement of the bending area while meeting the overload capacity requirement.

[0020] In some embodiments, the thickness of the second connecting area is 0.2mm-5mm. In this way, by limiting the thickness range of the second connecting area, the second connecting area after folding will not occupy too much space in the first direction, and the flow capacity can meet the use requirement.

[0021] In some embodiments, the thickness of the second connecting area is 0.5mm-1.2mm. In this way, by limiting the thickness of the second connecting area to an optimal range, the space occupied by the second connecting area in the first direction after folding is further optimized, and the flow capacity of the second connecting area is optimized.

[0022] In some embodiments, the thickness of the bending area is 0.1mm-6mm. In this way, by limiting the thickness range of the bending area, the mechanical strength of the bending area is appropriate, reducing the probability of fracture or deformation of the bending area.

[0023] In some embodiments, the thickness of the bending area is 0.2mm-5mm. In this way, by limiting the thickness of the bending area to an optimal range, the mechanical strength of the bending area is further optimized.

[0024] In some embodiments, the number of end covers and the number of adapters are both two, and the shell is provided with openings on opposite sides along the first direction, and each opening is covered with an end cover; each electrode assembly is formed with two opposite polarity folding areas on opposite sides along the first direction, and each folding area is electrically connected to an end cover through an adapter. In this way, each electrode assembly is formed with two opposite polarity folding areas on opposite sides along the first direction, and each folding area is electrically connected to an end cover through an adapter, so that the positive and negative tabs are electrically connected to the positive and negative electrode terminals of the end cover, and the structure design is reasonable and compact.

[0025] A battery device comprising the battery cell. The battery device replaces the conventional mode of folding the tab on the top side of the battery cell with a mode of folding the tab on the end side, fully utilizes the space in the length direction of the battery cell, reduces the height space required for folding the tab; in the plane perpendicular to the first direction, the projection of the folding area and the projection of the bending area have no overlapping part, which can improve the excessive occupation of the space in the length direction due to the stacking of the folding area and the bending area of the tab, improve the space utilization rate of the battery cell in the length direction, and help to improve the volumetric energy density of the battery cell.

[0026] An electric device comprising the battery device. The battery device can improve the excessive occupation of the space in the length direction due to the stacking of the folding area and the bending area of the tab, improve the space utilization rate of the battery cell in the length direction, and help to improve the volumetric energy density of the battery cell, thereby improving the endurance of the battery device in the electric device. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 A schematic view of an electric device in some embodiments of the present application.

[0028] Figure 2 A schematic view of a battery device in some embodiments of the present application.

[0029] Figure 3 An exploded view of a battery cell in some embodiments of the present application.

[0030] Figure 4 A schematic view of Figure 3 The end cap, electrode assembly and adapter of the battery cell shown.

[0031] Figure 5 A schematic view of Figure 4 The end cap and adapter shown in axonometric view.

[0032] Figure 6 A schematic view of Figure 5 The end cap and adapter shown in front view.

[0033] Figure 7 A schematic view of Figure 6 The end cap and adapter shown in A partial enlarged view.

[0034] Figure 8 A schematic view of Figure 5 The adapter shown in front view.

[0035] REFERENCE SIGNS:

[0036] 10, vehicle; 11, controller; 12, motor; 20, battery device; 21, box body; 21a, first part; 21b, second part; 22, battery cell;

[0037] 100, housing; 200, end cap; 300, electrode assembly; 301, tab; 302, tuck fold region; 400, adapter; 410, first connection region; 420, bend region; 430, second connection region; 500, electrode terminal. DETAILED DESCRIPTION

[0038] The embodiments of the present application will be described in detail with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, but cannot be used to limit the protection scope of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application; the terms "comprising" and "having," and any variations thereof, as used herein are intended to cover a non-exclusive inclusion.

[0040] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0041] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearance of the phrase in various places in the specification does not necessarily all refer to the same embodiment, nor is it necessarily independent or alternative embodiments to each other. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0042] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0043] In the description of the embodiments of the present application, the term "multiple" refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0044] In the description of the embodiments of the present application, the orientations or positional relationships indicated by the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and 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 devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the embodiments of the present application.

[0045] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0046] With the popularization and promotion of new energy vehicles, the charging and discharging performance, endurance capability and the like of new energy vehicles are increasingly attracting people's attention and attention. The power battery, which is a rechargeable battery, is the power source of new energy vehicles and is widely used in the field of new energy vehicles.

[0047] At present, in the assembly process of the battery, the tab is usually gathered and collected and then bent, and then the adapter is electrically connected with the electrode terminal of the top cover, that is, the tab is folded on the top side of the battery monomer. In the assembly mode of folding the tab on the top side, the height direction space occupied by the bent tab is doubled due to the large thickness of the tab layer, and the adapter is further stacked on the top of the bent tab, which will further occupy the height direction space of the battery monomer, resulting in low utilization rate of the internal space of the battery and low battery capacity.

[0048] Based on the above considerations, after in-depth research, a battery monomer, a battery device and a power-using equipment are designed. In the battery monomer, the adapter is divided into a first connecting area, a bending area and a second connecting area. The two connecting areas are foldably connected along the first direction (i.e. the length direction) through the bending area, and the two connecting areas are respectively electrically connected to the folding and folding area of the tab and the electrode terminal on the end cover. That is, the traditional folding tab mode on the top side of the battery monomer is replaced by the folding tab mode on the end side. The space of the battery monomer in the length direction is fully utilized, and the height space required for folding the tab is reduced. In the second direction (i.e. the height direction) intersecting the first direction, the folding and folding area is arranged staggered with the bending area, which can improve the excessive occupation of the space in the length direction due to the laminated arrangement of the folding and folding area of the tab and the bending area, improve the space utilization rate of the battery monomer in the length direction, and help to improve the volume energy density of the battery monomer.

[0049] The embodiments of the present application provide a power-using equipment using a battery device as a power supply. The power-using equipment can be, but is not limited to, a mobile phone, a tablet, a notebook computer, an electric toy, an electric tool, an electric car, an electric vehicle, a ship, a spacecraft, etc. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric plane toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0050] The following embodiments take a power-using equipment as a vehicle 10 for example for convenience of description.

[0051] Please refer to Figure 1 The vehicle 10 can be a fuel car, a gas car or a new energy car. The new energy car can be a pure electric car, a hybrid car or a range extended car, etc. The vehicle 10 is internally provided with a battery device 20, which can be arranged at the bottom, head or tail of the vehicle 10. The battery device 20 can be used for power supply of the vehicle 10, for example, the battery device 20 can be used as an operating power supply of the vehicle 10. The vehicle 10 can further include a controller 11 and a motor 12. The controller 11 is used to control the battery device 20 to supply power to the motor 12, for example, to meet the working power demand of the vehicle 10 during starting, navigation and driving. In some other embodiments of the present application, the battery device 20 can not only be used as an operating power supply of the vehicle 10, but also be used as a driving power supply of the vehicle 10, instead of or partially instead of fuel or natural gas to provide driving force for the vehicle 10.

[0052] In some embodiments of the present application, the battery device 20 can not only be used as an operating power supply of the vehicle 10, but also be used as a driving power supply of the vehicle 10, instead of or partially instead of fuel or natural gas to provide driving force for the vehicle 10.

[0053] Please refer toFigure 2 The battery device 20 includes a box 21 and a battery cell 22, wherein the battery cell 22 is accommodated in the box 21. The box 21 is used to provide an accommodation space for the battery cell 22, and the box 21 can adopt various structures. The box 21 includes a first part 21a and a second part 21b, the first part 21a and the second part 21b are covered with each other, and the first part 21a and the second part 21b jointly define an accommodation space for accommodating the battery cell 22. The second part 21b can be a hollow structure with one end open, and the first part 21a can be a plate-shaped structure, which is covered on the open side of the second part 21b to jointly define the accommodation space with the second part 21b; or the first part 21a and the second part 21b can both be hollow structures with one end open, and the open side of the first part 21a is covered on the open side of the second part 21b. Of course, the box formed by the first part 21a and the second part 21b can have various shapes, such as a cylinder, a cuboid, etc.

[0054] In the battery device 20, the battery cell 22 can be multiple, and the multiple battery cells 22 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the multiple battery cells 22 are connected in series and in parallel. The multiple battery cells 22 can be directly connected in series, in parallel, or in a mixed connection, and then the whole of the multiple battery cells 22 is accommodated in the box. Of course, the battery device 20 can also be that the multiple battery cells 22 are first connected in series, in parallel, or in a mixed connection to form a battery module, and then the multiple battery modules are connected in series, in parallel, or in a mixed connection to form a whole, which is accommodated in the box. The battery device 20 can also include other structures, for example, the battery device 20 can also include a current collecting component for realizing the electrical connection between the multiple battery cells 22.

[0055] Each battery cell 22 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 22 can be in the shape of a cylinder, a flat body, a cuboid, or other shapes, etc.

[0056] Please refer to Figure 3 and Figure 4 The battery cell 22 in an embodiment includes a shell 100, an end cover 200, at least one electrode assembly 300, and an adapter 400. The shell 100 is provided with an opening at at least one end in a first direction, the first direction being the length direction of the battery cell 22. The end cover 200 is covered on the opening of the shell 100, and the end cover 200 is provided with an electrode terminal 500. Each electrode assembly 300 is arranged in the shell 100, and the adapter 400 is used to electrically connect each electrode assembly 300 and the electrode terminal 500.

[0057] Each electrode assembly 300 has a tab 301 at at least one end along the first direction, and the tabs at the same end converge and fold together to form a folded-down area 302. The adapter 400 includes a first connecting area 410, a bending area 420 and a second connecting area 430 connected in sequence. The second connecting area 430 is used to electrically connect the electrode terminal 500, and the first connecting area 410 is used to electrically connect the folded-down area 302. The first connecting area 410 and the second connecting area 430 are foldably connected along the first direction through the bending area 420. On a plane perpendicular to the first direction, the projection of the folded-down area 302 and the projection of the bending area 420 are spaced apart.

[0058] It should be noted that the first direction is Figure 3 and Figure 4 The X direction shown is the length direction of the battery cell 22; the plane perpendicular to the first direction is the XZ plane. In the embodiments of this application, the housing 100 is a component that provides a receiving space for each electrode assembly 300, and the housing 100 can adopt various structures. For example, the housing 100 is a hollow structure with openings at both ends, and two end caps 200 are used to cover the two open sides of the housing 100 to define a closed receiving space. The housing 100 can be in the shape of a hollow cylinder, a hollow prism, or other shapes, and is not specifically limited here.

[0059] In the embodiments of this application, the end cap 200 is a component that covers the opening of the housing 100 to isolate the internal environment of the electrode assembly 300 from the external environment. The shape of the end cap 200 can be adapted to the shape of the housing 100. The end cap 200 can be made of a material with a certain hardness and strength, so that the end cap 200 is not easily deformed when subjected to compression and impact, allowing the battery cell 22 to have higher structural strength. Materials such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic can also be used. An insulating component can also be provided on the inner side of the end cap 200. The insulating component can be used to isolate the electrical connection components inside the housing 100 from the end cap 200 to reduce the risk of short circuits. For example, the insulating component can be plastic, rubber, etc.

[0060] In the embodiments of this application, the electrode assembly 300 is the component in the battery cell 22 where the electrochemical reaction occurs. The housing 100 may contain one or at least two electrode assemblies 300. The electrode assembly 300 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the battery cell assembly, while the portions of the positive and negative electrode sheets without active material each constitute a tab 301. The positive and negative tabs 301 can be located at both ends of the main body. During the charging and discharging process of the battery, the positive and negative active materials react with the electrolyte, and the tabs 301 connect to the electrode terminals 500 to form a current loop.

[0061] In the embodiments of the present application, the adapter 400 is an electrical connection component for electrically connecting the electrode assembly 300 and the electrode terminal 500. The adapter 400 is made of a conductive metal material to ensure that it can serve as a good conductor between the tab 301 and the electrode terminal 500 after being connected to the tab 301 and the electrode terminal 500. The adapter 400 includes a first connection region 410, a bending region 420, and a second connection region 430 connected in sequence, and the first connection region 410 and the second connection region 430 are foldably connected along a first direction through the bending region 420; the first connection region 410 and the second connection region 430 can be symmetrically distributed on the two sides of the bending region 420, and the first connection region 410, the bending region 420, and the second connection region 430 can be an integral structure or a split structure.

[0062] In the embodiments of the present application, the second connection region 430 is fixed to the electrode terminal 500 by laser welding, and the first connection region 410 is fixed to the folded and bent region 302 by ultrasonic welding. Alternatively, after the tabs 301 of the electrode assemblies 300 are folded and the folded and bent regions 302 are formed, the first connection region 410 is first fixed to the folded and bent region 302 by ultrasonic welding, and then the second connection region 430 is fixed to the electrode terminal 500 by laser welding.

[0063] The battery monomer 22 described above, the adapter 400 is divided into a first connection region 410, a bending region 420, and a second connection region 430, and the two connection regions are foldably connected along a first direction (i.e., a length direction) through the bending region 420, and the two connection regions are electrically connected to the folded and bent region 302 of the tab 301 and the electrode terminal 500 on the end cover 200, respectively, that is, the traditional method of folding the tab 301 on the top side of the battery monomer 22 is replaced by the method of folding the tab 301 on the end side, fully utilizing the space of the battery monomer 22 in the length direction, and reducing the height space required for folding the tab 301; in a plane perpendicular to the first direction, the projection of the folded and bent region 302 and the projection of the bending region 420 have no overlapping part, which can improve the problem of excessive occupation of the space in the length direction caused by the laminated arrangement of the folded and bent region 302 of the tab 301 and the bending region 420, improve the space utilization rate of the battery monomer 22 in the length direction, and help to improve the volume energy density of the battery monomer 22.

[0064] According to some embodiments of the present application, please refer to Figure 5 and Figure 6 The bending region 420 is an arc-shaped groove structure protruding outward at one end along a second direction, and the second direction intersects the first direction.

[0065] It should be noted that the second direction is the Z direction shown in Figure 3 and Figure 4 , that is, the height direction of the battery monomer 22. Protruding outward at one end along the second direction means that the bending region 420 is protruding outward at one end along the height direction of the battery monomer 22.Figure 5 and Figure 6 The Z direction is protruded downward or upward.

[0066] In the embodiments of the present application, the bending area 420 is configured as a pre-bending area formed before the first connecting area 410 is connected with the folding area 302. The pre-bending can be achieved in various ways. For example, the adapter 400 is first bent in a preset direction to form a bending arc, and then a clamping block is directly clamped on the area where the bending arc is located to maintain the bending state of the bending arc, thereby forming a pre-bending area. For another example, the adapter 400 is first bent in a preset direction to form a bending arc, and then a pressing block is respectively pressed on the side surface of the first connecting area 410 and the second connecting area 430 to maintain the bending state of the bending arc, thereby forming a pre-bending area.

[0067] In the embodiments of the present application, the arc-shaped groove can be a circular arc, for example, the arc-shaped groove is a 1 / 2 circular arc or a 1 / 3 circular arc. The arc-shaped groove can also be a non-circular arc, for example, the arc-shaped groove is an elliptical arc, a parabolic arc or a hyperbolic arc.

[0068] Through the above setting, the bending area 420 of the adapter 400 is arc-shaped, so that the bending area 420 of the adapter 400 does not have sharp corners, reducing the probability of damage to the tab 301 connected to the adapter 400 due to the presence of sharp corners in the bending area 420, and facilitating the subsequent adjustment of the bending angle of the bending area 420.

[0069] According to some embodiments of the present application, please refer to Figure 7 In the first direction, the inner diameter of the arc-shaped groove structure ranges from 1mm to 10mm.

[0070] It should be noted that the inner diameter of the arc-shaped groove structure is R. The greater the value of the inner diameter R of the arc-shaped groove structure, the more space the bending area 420 occupies in the first direction, and the farther apart the first connecting area 410 and the second connecting area 430 are after being foldably connected by the bending area 420 in the first direction. The smaller the value of the inner diameter R of the arc-shaped groove structure, the less space the bending area 420 occupies in the first direction, and the closer the first connecting area 410 and the second connecting area 430 are after being foldably connected in the first direction.

[0071] Through the above setting, by limiting the inner diameter range of the arc-shaped groove structure, the bending area 420 does not occupy too much space in the first direction to affect the volumetric energy density, and at the same time, enough space is provided for the connection of the first connecting area 410 and the second connecting area 430 with other components.

[0072] According to some embodiments of the present application, please refer to Figure 7 The inner diameter of the arc-shaped groove structure ranges from 3mm to 6mm.

[0073] In some embodiments of the present application, the inner diameter of the arc-shaped groove structure can be 3 mm, 4 mm, 5 mm, or 6 mm.

[0074] Through the above setting, by limiting the inner diameter of the arc-shaped groove structure to an optimal range, the space occupied by the bending area 420 in the first direction is further optimized, and the space provided when the first connecting area 410 and the second connecting area 430 are connected with other components is further optimized.

[0075] According to some embodiments of the present application, please refer to Figure 7 In the second direction, the depth of the arc-shaped groove structure ranges from 0.1 mm to 3 mm.

[0076] It should be noted that the depth of the arc-shaped groove structure is B. The greater the value of the depth B of the arc-shaped groove structure, the more space the bending area 420 occupies in the second direction; the smaller the value of the depth B of the arc-shaped groove structure, the less space the arc-shaped groove structure occupies in the second direction.

[0077] Through the above setting, by limiting the depth range of the arc-shaped groove structure, the bending area 420 will not occupy too much space in the second direction, reducing the impact on the volumetric energy density due to occupying too much space.

[0078] According to some embodiments of the present application, please refer to Figure 7 The depth of the arc-shaped groove structure ranges from 0.5 mm to 1.5 mm.

[0079] In some embodiments of the present application, the inner diameter of the arc-shaped groove structure can be 0.5 mm, 1 mm, or 1.5 mm.

[0080] Through the above setting, by limiting the depth of the arc-shaped groove structure to an optimal range, the space occupied by the bending area 420 in the second direction is further optimized, and the impact on the volumetric energy density is further optimized.

[0081] According to some embodiments of the present application, please refer to Figure 7 The wall thickness of the arc-shaped groove structure ranges from 0.2 mm to 5 mm.

[0082] It should be noted that the wall thickness of the arc-shaped groove structure is D. The greater the value of the wall thickness D of the arc-shaped groove structure, the higher the hardness of the bending area 420, and the less likely to be deformed under pressure; the smaller the value of the wall thickness D of the arc-shaped groove structure, the smaller the hardness of the bending area 420, and the more likely to be deformed under pressure.

[0083] Through the above setting, by limiting the wall thickness range of the arc-shaped groove structure, the hardness of the bending area 420 can be appropriate, reducing the probability of fracture or deformation of the bending area 420.

[0084] According to some embodiments of the present application, please refer to Figure 3 The wall thickness of the arc-shaped groove structure is in the range of 0.5mm to 1.2mm.

[0085] In the embodiments of the present application, the inner diameter of the arc-shaped groove structure can be 0.5mm, 1mm or 1.2mm.

[0086] Through the above setting, by limiting the wall thickness of the arc-shaped groove structure in the optimal range, the hardness of the bending area 420 is further optimized, so that the bending area 420 is not prone to fracture or deformation.

[0087] According to some embodiments of the present application, please refer to Figure 8 The bending area 420 is configured as a foil structure capable of elastic deformation and electrically conductive.

[0088] In the embodiments of the present application, the material of the foil structure can be adjusted according to the polarity of the tab 301. For example, when the adapter 400 connects the positive tab 301 with the positive electrode terminal 500, the foil structure can be an aluminum foil; when the adapter 400 connects the negative tab 301 with the negative electrode terminal 500, the foil structure can be a copper foil.

[0089] Through the above setting, the bending area 420 is a foil structure capable of elastic deformation and electrically conductive, which can make the bending area 420 have the electrically conductive overcurrent performance, and reduce the probability of fracture or deformation of the bending area 420.

[0090] According to some embodiments of the present application, please refer to Figure 8 The foil structure includes at least two foil sheets, and each foil sheet is stacked in the same direction.

[0091] It should be noted that each foil sheet is stacked in the same direction, that is, each foil sheet is stacked in the same direction, and the total thickness of each foil sheet after stacking is greater than or equal to the thickness of the first connecting area 410 and the thickness of the second connecting area 430, so that the bending area 420 can have sufficient overload capacity.

[0092] In the embodiments of the present application, the thickness of all foil sheets can be completely the same or not, which can be adjusted according to actual conditions.

[0093] Through the above setting, appropriate foil sheets can be selected for stacking according to actual conditions, so that the mechanical strength of the bending area 420 meets the requirements, and at the same time, the bending area 420 can have sufficient overload capacity.

[0094] According to some embodiments of the present application, please refer to Figure 8 The thickness of each foil sheet is in the range of 0.01mm to 0.5mm.

[0095] It can be understood that the greater the thickness of each foil, the higher the hardness of the bending area 420, and the less likely the bending area 420 is to deform under pressure. The smaller the thickness of each foil, the lower the hardness of the bending area 420, and the more likely the bending area 420 is to deform under pressure.

[0096] In an embodiment of the present application, the thickness of each foil can be 0.01 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm.

[0097] Through the above setting, by limiting the thickness range of each foil, the mechanical strength of the bending area 420 is appropriate, and the probability of fracture or deformation of the bending area 420 is reduced.

[0098] According to some embodiments of the present application, please refer to Figure 8 In the third direction, the width of the first connecting area 410 and the width of the second connecting area 430 are equal, the width of each foil is greater than or equal to the width of the second connecting area 430, and the width of each foil is less than the width of the end cover 200. The third direction, the first direction and the second direction intersect with each other and are not coplanar.

[0099] It should be noted that the third direction is the Y direction shown in Figure 8 , that is, the width direction of the battery monomer 22.

[0100] In an embodiment of the present application, in the third direction, the width of the first connecting area 410 and the width of the second connecting area 430 are equal, and the first connecting area 410 and the second connecting area 430 can be symmetrically distributed with the bending area 420 as the center.

[0101] In an embodiment of the present application, in the third direction, the width of each foil is greater than or equal to the width of the second connecting area 430, and the width of each foil is less than the width of the end cover 200, that is, in the third direction, each foil can exceed the second connecting area 430 and not exceed the end cover 200.

[0102] Through the above setting, in the third direction, each foil can exceed the second connecting area 430 and not exceed the end cover 200, so that each foil does not occupy space in the third direction, and at the same time, the width of each foil meets the overload capacity requirement.

[0103] According to some embodiments of the present application, please refer to Figure 8 The length of each foil is 1 mm to 60 mm.

[0104] It should be noted that the length of each foil refers to the length measured when each foil is in an unfolded state (i.e., before bending), that is, the length L.

[0105] Through the above setting, by limiting the length range of each foil, the length of each foil before bending is neither too short nor too long, and after bending, the size requirement can be met.

[0106] According to some embodiments of the present application, please refer to Figure 8 , the length of each foil is 1mm-30mm.

[0107] In the embodiments of the present application, the length of each foil can be 1mm, 10mm, 20mm or 30mm.

[0108] Through the above setting, the length of each foil is limited in the optimal range, which can optimize the size of each foil before and after bending.

[0109] According to some embodiments of the present application, please refer to Figure 8 , the thickness of the first connecting area 410 and the thickness of the second connecting area 430 are equal, and the thickness of the bending area 420 is greater than or equal to the thickness of the second connecting area 430.

[0110] It should be noted that in the first connecting area 410, the second connecting area 430 and the bending area 420, the thicknesses of the three can be consistent, or the thickness of the bending area 420 can be the thickest among the three.

[0111] Through the above setting, the thickness of the bending area 420 is greater than or equal to the thickness of the second connecting area 430, which can make the thickness of the bending area 420 meet the requirements, and at the same time, the bending area 420 can meet the overload capacity requirements.

[0112] According to some embodiments of the present application, please refer to Figure 8 , the thickness of the second connecting area 430 ranges from 0.2mm to 5mm.

[0113] It should be noted that the greater the thickness of the second connecting area 430, the more space the second connecting area 430 occupies in the first direction after folding, and the stronger the flow capacity; the smaller the thickness of the second connecting area 430, the smaller the space the second connecting area 430 occupies in the first direction after folding, and the weaker the flow capacity.

[0114] Through the above setting, by limiting the thickness range of the second connecting area 430, the second connecting area 430 can not occupy too much space in the first direction after folding, and at the same time, the flow capacity can meet the use requirements.

[0115] According to some embodiments of the present application, please refer to Figure 8 , the thickness of the second connecting area 430 ranges from 0.5mm to 1.2mm.

[0116] In some embodiments of the present application, the thickness of the second connecting region 430 can be 0.5 mm, 1 mm, or 1.2 mm.

[0117] By the above setting, the thickness of the second connecting region 430 is limited in an optimal range, further optimizing the design of the space occupied by the second connecting region 430 in the first direction after folding, and optimizing the flow capacity of the second connecting region 430.

[0118] According to some embodiments of the present application, please refer to Figure 8 , the thickness of the bending region 420 ranges from 0.1 mm to 6 mm.

[0119] It should be noted that the greater the thickness of the bending region 420, the greater the hardness of the bending region 420, and the less likely it is to deform under pressure; the smaller the thickness of the bending region 420, the smaller the hardness of the bending region 420, and the more likely it is to deform under pressure.

[0120] By the above setting, by limiting the thickness range of the bending region 420, the mechanical strength of the bending region 420 can be appropriately, reducing the probability of fracture or deformation of the bending region 420.

[0121] According to some embodiments of the present application, please refer to Figure 3 , the thickness of the bending region 420 ranges from 0.2 mm to 5 mm.

[0122] In some embodiments of the present application, the thickness of the bending region 420 can be 0.2 mm, 2 mm, or 5 mm.

[0123] By the above setting, the thickness of the bending region 420 is limited in an optimal range, further optimizing the mechanical strength of the bending region 420.

[0124] According to some embodiments of the present application, please refer to Figure 2 , the number of end covers 200 and the number of adapters 400 are both two, and the shell 100 is provided with openings on opposite sides along the first direction, and each opening is covered with an end cover 200; each electrode assembly 300 is formed with two folding regions 302 with opposite polarities on opposite sides along the first direction, and each folding region 302 is electrically connected to an end cover 200 through an adapter 400.

[0125] It should be noted that the two folding and folding areas 302 with opposite polarities, that is, the folding and folding area 302 of the positive tab 301 and the folding and folding area 302 of the negative tab 301. One of the end covers 200 is provided with a positive electrode terminal 500, and the other end cover 200 is provided with a negative electrode terminal 500, and the negative electrode terminal 500 is connected with the folding and folding area 302 of the negative tab 301 through an adapter 400, and the positive electrode terminal 500 is connected with the folding and folding area 302 of the positive tab 301 through another adapter 400.

[0126] In the embodiment of the application, the shell 100 is a hollow structure with openings at opposite ends in the first direction, and two end covers 200 are used to cover the two opening sides of the shell 100 to define a closed containing space, and each electrode assembly 300 is accommodated in the containing space.

[0127] Through the above arrangement, the two folding and folding areas 302 with opposite polarities can be formed on the opposite sides of each electrode assembly 300 in the first direction, and each folding and folding area 302 is electrically connected with an end cover 200 through an adapter 400, so that the positive and negative tabs 301 are electrically connected with the positive and negative electrode terminals 500 of the end cover 200, and the structure design is reasonable and compact.

[0128] Please refer to Figure 1 The battery device 20 in an embodiment includes the above-mentioned battery monomer 22.

[0129] The battery device 20 described above replaces the traditional way of folding the tab 301 on the top side of the battery monomer 22 to the way of folding the tab 301 on the end side, fully utilizes the space of the battery monomer 22 in the length direction, and reduces the height space required for folding the tab 301; in the second direction (that is, the height direction) intersecting the first direction, the folding and folding area 302 is arranged staggered with the bending area 420, which can improve the excessive occupation of the space in the length direction due to the folding and folding area 302 of the tab 301 and the bending area 420 arranged in layers, improve the space utilization rate of the battery monomer 22 in the length direction, and help to improve the volume energy density of the battery monomer 22.

[0130] Please refer to Figures 3 to 8 The power consumption equipment in an embodiment includes the above-mentioned battery device 20.

[0131] The power consumption equipment described above, the battery device 20 can improve the excessive occupation of the space in the length direction due to the folding and folding area 302 of the tab 301 and the bending area 420 arranged in layers, improve the space utilization rate of the battery monomer 22 in the length direction, and help to improve the volume energy density of the battery monomer 22, thereby improving the endurance of the battery device 20 in the power consumption equipment.

[0132] According to some embodiments of the application, refer toFigure 2 The battery cell 22 in an embodiment includes a shell 100, an end cover 200, electrode assemblies 300, and a connector 400. The shell 100 is provided with an opening at at least one end in a first direction, which is the length direction of the battery cell 22. The end cover 200 covers the opening of the shell 100. The end cover 200 is provided with electrode terminals 500. Each electrode assembly 300 is arranged in the shell 100. The connector 400 is used to electrically connect each electrode assembly 300 and the electrode terminals 500. Each electrode assembly 300 is provided with a tab 301 at at least one end in the first direction. Each tab located at the same end is converged and folded to form a converged and folded area 302. The connector 400 includes a first connecting area 410, a bending area 420, and a second connecting area 430 connected in sequence. The second connecting area 430 is used to electrically connect the electrode terminals 500. The first connecting area 410 is used to electrically connect the converged and folded area 302. The first connecting area 410 and the second connecting area 430 are foldably connected through the bending area 420 in the first direction. In a plane perpendicular to the first direction, the projection of the converged and folded area 302 is arranged separately from the projection of the bending area 420.

[0133] The bending area 420 is an arc-shaped groove structure protruding outward at one end in the second direction. The inner diameter of the arc-shaped groove structure ranges from 3 mm to 6 mm. The depth of the arc-shaped groove structure ranges from 0.5 mm to 1.5 mm. The wall thickness of the arc-shaped groove structure ranges from 0.5 mm to 1.2 mm. The bending area 420 is a foil structure capable of elastic deformation and electrical conduction. The foil structure includes at least two foil sheets. Each foil sheet is arranged in the same direction. The length of each foil sheet ranges from 1 mm to 30 mm. The thickness of the second connecting area 430 ranges from 0.5 mm to 1.2 mm. The thickness of the bending area 420 ranges from 0.2 mm to 5 mm.

[0134] According to some embodiments in the present application, referring to Figure 1 The battery device 20 in an embodiment includes the battery cell 22 described above.

[0135] According to some embodiments in the present application, referring to ​ The electric device in an embodiment includes the battery device 20 described above.

[0136] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them. Although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that the technical solutions recorded in the foregoing embodiments can be modified, or some or all of the technical features can be replaced equivalently. Such modifications or replacements do not change the essence of the corresponding technical solutions, which should be covered in the scope of the claims and the specification of the present application. In particular, the technical features mentioned in each embodiment can be combined in any manner as long as there is no structural conflict. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell (22) characterized by, The application relates to a battery cell module, comprising: a shell (100) provided with an opening at at least one end in a first direction, the first direction being a length direction of the battery cell (22); an end cover (200) covering the opening of the shell (100), the end cover (200) being provided with an electrode terminal (500); at least one electrode assembly (300) arranged in the shell (100); an adapter (400) for electrically connecting the electrode assemblies (300) and the electrode terminal (500); wherein each of the electrode assemblies (300) is provided with a tab (301) at at least one end in the first direction, the tabs at the same end are converged and form a converged folding area (302); the adapter (400) comprises a first connecting area (410), a bending area (420) and a second connecting area (430) connected in sequence, the second connecting area (430) is used for electrically connecting the electrode terminal (500), the first connecting area (410) is used for electrically connecting the converged folding area (302), the first connecting area (410) and the second connecting area (430) are foldably connected in the first direction through the bending area (420); the bending area (420) is an arc-shaped groove structure protruding outward at one end in a second direction, the second direction intersects the first direction, and the second direction is a height direction of the battery cell (22); in a plane perpendicular to the first direction, the projection of the converged folding area (302) and the projection of the bending area (420) are arranged at intervals.

2. The battery cell (22) of claim 1, characterized in that In the first direction, the inner diameter of the arc-shaped groove structure ranges from 1 mm to 10 mm.

3. The battery cell (22) of claim 2, wherein, The inner diameter of the arc-shaped groove structure ranges from 3 mm to 6 mm.

4. The battery cell (22) of claim 1, wherein, In the second direction, the depth of the arc-shaped groove structure ranges from 0.1 mm to 3 mm.

5. The battery cell (22) of claim 4, wherein, The depth of the arc-shaped groove structure ranges from 0.5 mm to 1.5 mm.

6. The battery cell (22) of claim 1, wherein, The wall thickness of the arc-shaped groove structure ranges from 0.2 mm to 5 mm.

7. The battery cell (22) of claim 6, characterized in that The wall thickness of the arc-shaped groove structure ranges from 0.5 mm to 1.2 mm.

8. The battery cell (22) of claim 1, wherein, The bending area (420) is configured as a foil structure capable of elastic deformation and electric conduction.

9. The battery cell (22) of claim 8, wherein, The foil structure comprises at least two foil sheets, and each of the foil sheets is arranged in the same direction.

10. The battery cell (22) of claim 9, characterized in that The thickness of each of the foil sheets ranges from 0.01 mm to 0.5 mm.

11. The battery cell (22) of claim 9, wherein, In a third direction, the width of the first connecting area (410) and the width of the second connecting area (430) are equal, the width of each of the foil sheets is greater than or equal to the width of the second connecting area (430), and the width of each of the foil sheets is less than the width of the end cover (200), the third direction, the first direction and the second direction intersect each other and are not coplanar.

12. The battery cell (22) of claim 9, wherein, The length of each of the foil sheets ranges from 1 mm to 60 mm.

13. The battery cell (22) of claim 12, wherein, The length of each of the foil sheets ranges from 1 mm to 30 mm.

14. The battery cell (22) according to any one of claims 1-13, characterized in that, The thickness of the first connecting area (410) and the thickness of the second connecting area (430) are equal, and the thickness of the bending area (420) is greater than or equal to the thickness of the second connecting area (430).

15. The battery cell (22) of claim 14, wherein, The thickness of the second connecting area (430) ranges from 0.2mm to 5mm.

16. The battery cell (22) of claim 15, wherein, The thickness of the second connecting area (430) ranges from 0.5mm to 1.2mm.

17. The battery cell (22) of claim 14, wherein, The thickness of the bending area (420) ranges from 0.1mm to 6mm.

18. The battery cell (22) of claim 17, wherein, The thickness of the bending area (420) ranges from 0.2mm to 5mm.

19. The battery cell (22) of claim 1, wherein, The number of the end covers (200) and the number of the adapters (400) are both two, and the shell (100) is provided with openings on opposite sides along the first direction, and each opening is covered with one end cover (200); Each electrode assembly (300) is provided with two opposite folding areas (302) with opposite polarities on opposite sides along the first direction, and each folding area (302) is electrically connected with one end cover (200) through one adapter (400).

20. A battery device (20) characterized by A battery cell (22) as claimed in any of claims 1 to 19.

21. An electrical device, comprising: A battery device (20) as claimed in claim 20.

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