Battery cell, battery device, and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The electrode assembly comprises a shell, an electrode assembly body and an end cover assembly, at least one end of the shell in the first direction is provided with an opening, the electrode assembly body is at least partially contained in the shell, the end cover assembly seals the opening, and the end cover assembly comprises a cover plate and a limiting assembly arranged on the cover plate. And the limiting assembly can be in limiting connection with the beam limiting piece of the battery monomer. The problem that the structural strength of a battery pack is difficult to meet the requirement is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of batteries, in particular to a battery monomer, a battery device and a power consumption device. BACKGROUND

[0002] With the development of new energy technology, batteries are increasingly widely used, such as in mobile phones, notebook computers, electric cars, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric planes and electric tools.

[0003] With the increasing demand for high energy density of batteries, the structural strength of the related battery group is difficult to meet the demand. UTILITY MODEL CONTENT

[0004] The present application provides a battery monomer, a battery device and a power consumption device, which can improve the structural connection strength.

[0005] In a first aspect, the present application provides a battery monomer, comprising: a shell having an opening at least at one end in a first direction; an electrode assembly at least partially contained in the shell; a cover assembly closing the opening, the cover assembly comprising a cover plate and a limiting assembly provided on the cover plate, the limiting assembly being capable of limiting connection of a limiting member of the battery monomer.

[0006] When a plurality of battery monomers are grouped, the plurality of battery monomers are connected to each other to improve overall stability. The present application embodiment improves the overall structural connection strength of the plurality of battery monomers by providing a limiting assembly on the cover plate and by the structural connection of the limiting member and the limiting assembly, improves the connection stability of the battery monomer and the limiting member, reduces the risk of falling of the limiting member, and improves the assembly quality when the battery monomers are grouped.

[0007] In some embodiments, the limiting assembly comprises a recess structure recessed from the surface of the cover plate to the inside of the cover plate, and the recess structure is provided through the cover plate along the width direction of the cover plate. The recess structure is formed on the cover plate to accommodate at least part of the limiting member, and the limiting member is limited by the recess structure, so that the cover plate and the limiting member form a structural connection, improve the connection stability of the battery monomer and the limiting member, and the structure of the recess structure is simple, facilitating manufacturing and installation of the limiting member.

[0008] In some embodiments, the radial width of the recess structure has a decreasing trend from the surface of the cover plate to the inside of the cover plate. The gradual decreasing trend of the radial width of the recess structure can facilitate the insertion of the limiting member.

[0009] In some embodiments, the cover plate comprises a first surface, a second surface and a side surface connected to the first surface and the second surface, the first surface faces away from the opening, and the limiting component is arranged on at least one of the first surface and the side surface. Arranging the limiting component on the first surface can facilitate the manufacturing of the limiting component and the installation of the limiting member; arranging the limiting component on the side surface can reduce the occupation of the upper space of the cover plate by the limiting component, and can realize the connection of a plurality of directionally adjacent battery monomers through the limiting member structure, thereby improving the connection strength.

[0010] In some embodiments, the limiting component is arranged on the first surface, and the local maximum thickness of the cover plate is H, and the recess depth of the recess structure is in the range of 1 mm to H / 2. The embodiments of the application can further reduce the influence of the recess structure on the rigidity of the cover plate.

[0011] In some embodiments, the limiting component comprises a limiting member arranged on the side of the cover plate facing away from the opening, and the limiting member is provided with at least one limiting passage, and the axis of the limiting passage extends in the width direction of the cover plate. Arranging the limiting member on the cover plate can improve the overall rigidity of the end cover assembly, and the limiting member is arranged in the limiting passage to realize the structural connection of the cover plate and the limiting member, thereby improving the structural connection strength of the limiting member and the battery monomer.

[0012] In some embodiments, at least two limiting members are arranged at intervals in the width direction of the cover plate, and the limiting passages of the limiting members are coaxially arranged. By arranging a plurality of limiting members at intervals, the influence of the limiting member connection on the cover plate is reduced, and the stable connection between the limiting member and the limiting member is improved, thereby reducing the risk of connection failure of the limiting member and the battery monomer.

[0013] In some embodiments, the limiting member is arranged continuously in the width direction of the cover plate, and the limiting passage penetrates the limiting member in the extension direction of the limiting member. The extension of the limiting member can increase the contact area of the limiting member and the limiting member in the limiting passage, thereby improving the stable connection of the limiting member and the limiting member.

[0014] In some embodiments, the limiting passage penetrates the limiting member in at least one direction in the cross section. The limiting passage penetrates the limiting member in the radial direction of the cross section, which facilitates the placement of the limiting member in the limiting passage.

[0015] In a second aspect, the application also provides a battery device, comprising: a battery monomer group comprising at least one battery monomer arranged in a row according to any one of the embodiments of the first aspect; and a limiting member in limiting connection with the limiting component of the battery monomer arranged in a row in the battery monomer group.

[0016] In some embodiments, the battery device further comprises a box body, the battery cell group and the limiting piece are arranged in the box body, and a side of the limiting piece away from the battery cell abuts against the box body. The limiting assembly comprises a recess structure arranged in the cover plate, and part of the limiting piece is arranged in the recess structure. The limiting piece abuts against the box body, and the abutment of the box body improves the connection stability of the limiting piece and the battery cell.

[0017] In some embodiments, the limiting piece comprises a fitting part and a limiting part. The fitting part comprises oppositely arranged first and second fitting surfaces, and the limiting part is arranged in the first fitting surface in the thickness direction. The radial dimension of the fitting part is greater than that of the limiting part. The limiting part is in limiting connection with the limiting assembly, and the second fitting surface abuts against the box body. The radial dimension of the fitting part is greater than that of the limiting part, so that part of the first fitting surface is in contact with the cover plate. When the box body abuts against the second fitting surface, the limiting part is prevented from excessively pressing the cover plate, thereby preventing the cover plate from deforming.

[0018] In some embodiments, the battery device further comprises a battery patch. The battery patch covers the side of the battery cell group where the limiting piece is arranged. The battery patch comprises a hollow area, and the hollow area is arranged corresponding to the limiting assembly. The limiting piece penetrates the hollow area of the battery patch and is in limiting connection with the limiting assembly in the first direction. The limiting assembly is arranged on the first surface of the cover plate, penetrates the hollow area of the battery patch, and is connected with the battery cell. This improves the close fit of the battery patch and the cover plate, and improves the insulation and protection effect of the end cover assembly.

[0019] In a third aspect, the present application provides a power utilization device comprising the battery device of any one of the embodiments of the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0020] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the accompanying drawings.

[0021] Figure 1 A structural schematic diagram of a vehicle is provided for some embodiments of the present application;

[0022] Figure 2 A schematic diagram of a battery device is provided for some embodiments of the present application;

[0023] Figure 3 An exploded view of a battery cell is provided for some embodiments of the present application;

[0024] Figure 4 A Figure 3 A top view of a battery cell;

[0025] Figure 5 A Figure 4 A sectional view of a cover plate along A-A direction;

[0026] Figure 6 A partial sectional view of a limiting assembly and a limiting piece in cooperation is provided for some embodiments of the present application;

[0027] Figure 7 A structural diagram of a limiting component according to some embodiments of the present application;

[0028] Figure 8 A structural diagram of a limiting member according to some embodiments of the present application;

[0029] Figure 9 Another structural diagram of a limiting member according to some embodiments of the present application;

[0030] Figure 10 Still another structural diagram of a limiting member according to some embodiments of the present application;

[0031] Figure 11 A partial top view of an example of a limiting member according to some embodiments of the present application;

[0032] Figure 12 A partial top view of another example of a limiting member according to some embodiments of the present application;

[0033] Figure 13 A top view of a battery device according to some embodiments of the present application;

[0034] Figure 14 A partial sectional view of a battery device according to some embodiments of the present application;

[0035] Figure 15 A structural diagram of a beam limiting member according to some embodiments of the present application;

[0036] Figure 16 A schematic diagram of a battery device in a state of being attached according to some embodiments of the present application.

[0037] In the drawings, the drawings are not necessarily drawn to scale.

[0038] Reference signs are explained as follows:

[0039] 10, vehicle; 11, battery device; 12, controller; 13, motor; 110, battery cell group; 111, case; 112, first case; 113, second case;

[0040] 100, battery cell; 101, shell; 102, end cover assembly; 103, electrode assembly; 104, shell; 105, cover plate; 106, limiting assembly; 103a, positive plate; 106a, concave structure; 107, first groove; 108, second groove; 106b, limiting piece; 130, pole assembly; 131, positive pole; 132, negative pole; 133, pole identification; 134, positive pole identification; 135, negative pole identification; 140, liquid injection hole; 150, pressure relief valve; 120, first surface; 121, second surface; 122, side surface;

[0041] 123, limiting channel; 200, beam limiting piece; 201, fitting part; 202, limiting part; 203, first fitting surface; 204, second fitting surface; 114, battery patch; 115, hollow area; X, first direction. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as would be understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification herein is for the purpose of describing the particular embodiments only and is not intended to be limiting of the application; the use of the terms "including," "comprising," "having" and "with" in the specification and claims herein, as well as similar terms, are used in their open, non-limiting sense.

[0044] 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 "a plurality of" is two or more, unless otherwise explicitly and specifically limited.

[0045] 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.

[0046] In the description of the embodiments of the present application, the term "and / or" is merely an 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 existing alone, A and B existing together, and B existing alone. In addition, the character " / " herein generally represents an "or" relationship between the front and rear associated objects.

[0047] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0048] In the description of the embodiments of the present application, 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 indicate the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present application and simplifying the description, and does 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.

[0049] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0050] At present, from the development of market situation, the application of battery is more and more extensive. The battery is not only applied to the energy storage power supply system of water power, fire power, wind power and solar power station, but also widely applied to electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of the battery, the demand of the market is also increasing.

[0051] The battery monomer usually includes a shell, an electrode assembly contained in the shell, and a terminal assembly provided on the shell. The electrode assembly is electrically connected to the terminal assembly, and the terminal assembly is used to be electrically connected with an external circuit to realize charging or discharging of the battery monomer.

[0052] The battery device generally refers to a single physical module comprising a plurality of battery cells to provide higher voltage and capacity. The battery cell can be the smallest unit constituting the battery device. The plurality of battery cells are arranged in groups in the box of the battery device. In order to reduce the risk of short circuit between the plurality of battery cells, a blue film is usually covered on the outside of the shell of the housing, and a top cover patch is arranged on the end cover of the housing to achieve insulation and isolation between the battery cells and other battery cells.

[0053] When the plurality of battery cells are assembled into groups, in order to reduce the risk of shaking of the plurality of battery cells in the box, it is usually necessary to bond the shell of the battery cell and the box to each other, and to arrange a pressing strip in the box of the battery device, and to arrange a structural adhesive on the housing of each battery cell, and to bond the pressing strip and the cover plate of the plurality of battery cells to each other by the pressing strip, so as to assemble the plurality of battery cells into a whole, thereby increasing the overall structural strength of the plurality of battery cells assembled into groups, and improving the use stability and use reliability of the battery device. However, the battery cell of this structure has poor bonding strength between the structural adhesive and the end cover when stacked into groups, resulting in the phenomenon that the battery cell and the pressing strip are not firmly bonded during the assembly of the plurality of battery cells into groups, and even the end cover is detached due to the pulling action of the pressing strip during use, resulting in the phenomenon that the pressing strip and the battery cell are separated, thereby causing poor assembly quality and use stability of the battery device.

[0054] In view of this, the battery cell provided by the embodiments of the present application is provided. The limiting assembly is arranged on the cover plate, and the limiting assembly and the limiting member are connected in structure, thereby improving the overall structural connection strength of the plurality of battery cells assembled into groups, improving the connection stability of the battery cell and the limiting member, reducing the risk of falling of the limiting member, and improving the assembly quality of the battery cell when assembled into groups.

[0055] The battery cell described in the embodiments of the present application is applicable to a battery device and an electric device using the battery device. The electric device can be a device using the battery device as a power supply or various energy storage systems using the battery device as an energy storage element. The electric device can be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, an electric toy, an electric tool, an electric vehicle, an electric car, 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 spaceships, etc.

[0056] The following embodiments take a vehicle 10 as an example for convenience of description.

[0057] Figure 1 The structural schematic diagram of the vehicle 10 provided by some embodiments of the present application is shown.

[0058] AsFigure 1 As shown, the vehicle 10 is provided with a battery device 11, which can be arranged at the bottom, head or tail of the vehicle 10. The battery device 11 can be used for power supply of the vehicle 10, for example, the battery device 11 can be used as the operating power source of the vehicle 10.

[0059] The vehicle 10 can further include a controller 12 and a motor 13, the controller 12 being used to control the battery device 11 to supply power to the motor 13, for example, for the power demand of the vehicle 10 during starting, navigation and driving.

[0060] In some embodiments of the present application, the battery device 11 can not only be used as the operating power source of the vehicle 10, but also be used as the driving power source of the vehicle 10, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 10.

[0061] Figure 2 A schematic diagram of the battery device 11 provided in some embodiments of the present application.

[0062] Referring to Figure 2 In some embodiments, the battery device 11 can include one or more battery cell groups for providing voltage and capacity.

[0063] The battery cell group 110 can include a plurality of battery cells 100 Figure 2 (not shown), which are connected in series, in parallel or in a mixed manner by a busbar component. The mixed manner means that the plurality of battery cells 100 are connected in series and in parallel.

[0064] The battery cell 100 can be a secondary battery cell 100, which means that the battery cell 100 can be activated by charging after discharging to continue to be used.

[0065] As an example, the battery cell 100 can be a lithium ion battery cell 100, a sodium ion battery cell 100, a sodium lithium ion battery cell 100, a lithium metal battery cell 100, a sodium metal battery cell 100, a lithium sulfur battery cell 100, a magnesium ion battery cell 100, a nickel hydrogen battery cell 100, a nickel cadmium battery cell 100, a lead-acid battery cell 100, etc.

[0066] As an example, the battery cell 100 can be a prismatic battery cell 100 or other shaped battery cell 100, the prismatic battery cell 100 including a square battery cell 100, a blade-shaped battery cell 100, a multi-prismatic battery cell 100, for example, a hexagonal prismatic battery cell 100, etc.

[0067] In some embodiments, the battery cell group 110 is generally formed by arranging a plurality of battery cells 100. For example, the battery cell group 110 can be a battery module formed by arranging and fixing a plurality of battery cells 100 to form a separate module. For example, the battery module can be formed by bundling a plurality of battery cells 100 by a cable tie.

[0068] In some embodiments, the battery device 11 can be a battery pack including a box 111 and one or more battery cell groups 110, and the battery cell group 110 is accommodated in the box 111. For example, the battery cell group 110 can be a battery module, and the battery cell group 110 can be accommodated in the box 111 by fixing the battery module in the box 111. For example, the battery cell group 110 can also be accommodated in the box 111 by directly fixing a plurality of battery cells 100 to the box 111.

[0069] In some embodiments, the box 111 for accommodating the battery cell 100 can have various structures.

[0070] In some embodiments, the box 111 can include a first box 112 and a second box 113. The first box 112 and the second box 113 are coupled so that an enclosed space is formed inside the box 111 to accommodate the battery cell group 110. Here, the enclosed means covered or closed, which can be sealed or unsealed. The first box 112 can be a top cover or a bottom plate.

[0071] In some embodiments, the box 111 can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame so that an enclosed space is formed inside the box 111 to accommodate the battery cell group 110. For example, the frame can include a plurality of side beams.

[0072] In some embodiments, the box 111 can be a part of the chassis structure of the vehicle 10. For example, a part of the box 111 can be at least a part of the floor of the vehicle 10, or a part of the box 111 can be at least a part of the cross beam and the longitudinal beam of the vehicle 10.

[0073] In some embodiments, the battery device 11 can be an energy storage device.

[0074] The energy storage device can be used in an energy storage power station, a wind power system, a solar power system, a mobile power system, or a temporary power supply system, etc. The energy storage device can store electrical energy as needed and output electrical energy at an appropriate time. For example, the energy storage device can store electrical energy during the off-peak period of electricity consumption, and provide electrical energy to the relevant user or power device during the peak period of electricity consumption.

[0075] In some embodiments, the energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0076] In some embodiments, a plurality of battery cells 100 are provided, and the plurality of battery cells 100 are connected in series or in parallel or in a mixed manner to form a battery cell group 110. The plurality of battery cell groups 110 are connected in series or in parallel or in a mixed manner to form an integrated whole and are accommodated in a box 111.

[0077] The plurality of battery cells 100 in the battery cell group 110 can be electrically connected through busbar components to achieve parallel connection, series connection or mixed connection of the plurality of battery cells 100 in the battery cell group 110. The busbar components can be one or more, and each busbar component is used to electrically connect at least two battery cells 100.

[0078] Figure 3 An exploded view of the battery cell 100 is provided for some embodiments of the present application.

[0079] As shown in Figure 3 An embodiment of the present application provides a battery cell 100, which includes a shell 101 and an electrode assembly 103 accommodated in the shell 101.

[0080] In some embodiments, the shell 101 can be a steel shell, an aluminum shell or a composite metal shell (such as a copper-aluminum composite shell 101), etc. The shell 101 can be a hollow structure, and an accommodation cavity for accommodating the electrode assembly 103 and the electrolyte is formed inside the shell 101. In some embodiments, the shell 101 of the battery cell 100 is a square shell 101, a prismatic shell 101 or a shell 101 of other shapes.

[0081] In some embodiments of the present application, the shell 101 includes a shell body 104 and an end cover assembly 102, and the shell body 104 has an opening at least at one end. The end cover assembly 102 closes the opening.

[0082] The shell body 104 is a component for cooperating with the end cover assembly 102 to form an internal cavity of the battery cell 100, and the internal cavity formed can be used to accommodate the electrode assembly 103, the electrolyte and other components. The shell body 104 and the end cover assembly 102 can be independent components. The shell body 104 can be of various shapes and sizes, such as a cuboid or a prism. Specifically, the shape of the shell body 104 can be determined according to the specific shape and size of the electrode assembly 103. The material of the shell body 104 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.

[0083] The shape of the end cover assembly 102 can be adapted to the shape of the shell 104 to fit the shell 104. The material of the end cover assembly 102 can be the same as or different from the material of the shell 104. Optionally, the end cover assembly 102 can be made of a material with certain hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, etc.), so that the end cover assembly 102 is not easily deformed when subjected to extrusion collision, so that the battery monomer 100 can have higher structural strength, and the reliability can also be improved. The end cover assembly 102 is connected to the shell 104 by welding, bonding, clamping or other means.

[0084] The shell 104 can be open at one end or both ends. In some examples, the shell 104 can be a structure open on one side, and the end cover assembly 102 is provided as one and covers the shell 104. In other examples, the shell 104 can also be a structure open on both sides, and the end cover assembly 102 is provided as two, and the two end cover assemblies 102 cover the two openings of the shell 104 respectively.

[0085] The electrode assembly 103 is a component that undergoes an electrochemical reaction in the battery monomer 100. The electrode assembly 103 is at least partially contained in the shell 104, and the shell 104 can contain one or more electrode assemblies 103.

[0086] In some embodiments, the electrode assembly 103 includes a positive electrode sheet 103a, a negative electrode sheet (not shown in the figure) and a separator (not shown in the figure), the positive electrode sheet 103a and the negative electrode sheet are opposite in polarity, and the separator separates the positive electrode sheet 103a and the negative electrode sheet.

[0087] At least part of the separator is located between the positive electrode sheet 103a and the negative electrode sheet. During the charging and discharging process of the battery monomer 100, active ions (such as lithium ions) are embedded and extracted between the positive electrode sheet 103a and the negative electrode sheet. The separator is arranged between the positive electrode sheet 103a and the negative electrode sheet, which can prevent the positive and negative electrodes from short-circuiting, and at the same time allow the active ions to pass through.

[0088] In some embodiments, the battery monomer 100 further includes an electrolyte, which plays a role in conducting ions between the positive electrode sheet 103a and the negative electrode sheet. The electrolyte of the present application can be selected according to the needs. The electrolyte can be liquid, gel or solid.

[0089] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0090] In some embodiments, the electrode assembly 103 can be a wound structure, a stacked structure, or a hybrid structure of winding and stacking.

[0091] In some embodiments, the electrode assembly 103 is a wound structure. The positive electrode sheet 103a and the negative electrode sheet are wound into a wound structure.

[0092] In some embodiments, the electrode assembly 103 is a laminated structure.

[0093] As an example, a plurality of positive electrode sheets 103a and a plurality of negative electrode sheets are alternately laminated. As an example, a plurality of positive electrode sheets 103a are provided, and a negative electrode sheet is folded to form a plurality of laminated folded sections, and one positive electrode sheet 103a is clamped between adjacent folded sections.

[0094] As an example, a plurality of positive electrode sheets 103a and a plurality of negative electrode sheets are alternately laminated. As an example, a plurality of positive electrode sheets 103a are provided, and a negative electrode sheet is folded to form a plurality of laminated folded sections, and one positive electrode sheet 103a is clamped between adjacent folded sections.

[0095] As an example, a plurality of separators are provided, and each is provided between any adjacent positive electrode sheet 103a or negative electrode sheet.

[0096] As an example, a plurality of separators are provided, and each is provided between any adjacent positive electrode sheet 103a or negative electrode sheet.

[0097] In some embodiments, the electrode assembly 103 can have a flat shape or a multi-prism shape, etc.

[0098] Figure 4 For Figure 3 A top view of the battery cell 100; Figure 5 For Figure 4 A sectional view of the cover plate 105 along the A-A direction; Figure 6 A partial sectional view of the limiting assembly 106 cooperating with the limiting member 200 provided in some embodiments of the present application; Figure 7 A structural schematic diagram of the limiting assembly 106 provided in some embodiments of the present application; Figure 8 A structural schematic diagram of the limiting member 106b provided in some embodiments of the present application.

[0099] As Figures 3 to 8 shown, the battery cell 100 provided in an embodiment of the present application includes a shell 104, an electrode assembly 103, and an end cover assembly 102. The shell 104 has an opening at at least one end along a first direction X. The electrode assembly 103 is at least partially accommodated in the shell 104. The end cover assembly 102 closes the opening, and includes a cover plate 105 and a limiting assembly 106 provided on the cover plate 105. The limiting assembly 106 can limit the connection of a limiting member 200 of the battery cell 100.

[0100] As Figure 3As shown, the end cover assembly 102 is a combined structure for covering the opening. The end cover assembly 102 includes a cover plate 105 and a limiting assembly 106. The cover plate 105 can be shaped to match the shape of the shell 104 to fit the shell 104. The cover plate 105 can be made of the same material as the shell 104 or a different material. Optionally, the cover plate 105 can be made of a material with certain hardness and strength (e.g., copper, iron, aluminum, stainless steel, aluminum alloy, etc.) so that the cover plate 105 is less likely to deform when subjected to extrusion and impact, and the battery monomer 100 can have higher structural strength and improved reliability. The cover plate 105 can be connected to the shell 104 by welding, bonding, clamping, or other means.

[0101] The limiting assembly 106 is a connecting structure that can limit the connection between the limiting member 200 and the cover plate 105 of the battery monomer 100. Figure 5 and Figure 8 As shown, the limiting assembly 106 is provided on the cover plate 105, for example, the limiting assembly 106 can be recessed in the cover plate 105 or protrude from the cover plate 105. For example, the limiting assembly 106 includes a limiting member 106b that protrudes from the cover plate 105, and the limiting member 106b can be welded to the cover plate 105. The limiting assembly 106 can include one or more limiting members 106b. The limiting member 106b can be bonded, riveted, or connected to the cover plate 105 by other means.

[0102] For example, the limiting member 106b can include a groove or a ring structure. For example, the limiting member 200 is at least partially disposed in the groove and connected to the limiting member 106b, that is, the limiting member 106b can be entirely or partially accommodated in the groove. For example, the limiting member 200 penetrates the ring structure and is connected to the limiting member 106b.

[0103] For example, the cover plate 105 includes a first surface 120, a second surface 121 opposite the first surface 120 in the first direction X, and a side surface 122 connected to the first surface 120 and the second surface 121, the first surface 120 faces away from the opening, and the limiting assembly 106 is provided on the first surface 120 and / or the side surface 122. For example, the limiting assembly 106 includes a recess structure 106a recessed in the first surface 120, and the limiting assembly 106 can include one or more recess structures 106a. The plurality of recess structures 106a can be provided on the surface of the cover plate 105 facing away from the opening, or the plurality of recess structures 106a can be provided on the first surface 120 and the side surface 122 at the same time. The number of limiting members 200 corresponds to the number of recess structures 106a.

[0104] The constraint member 200 is a connection structure that connects multiple battery cells 100. The shape of the constraint member 200 matches the shape of the limiting assembly 106. Exemplarily, the cross-section of the recessed structure 106a is semi-circular, and the cross-section of the constraint member 200 is also semi-circular, or at least a portion of the cross-section of the constraint member 200 is semi-circular. In some examples, the cross-section of the recessed structure 106a can be a simple shape such as a triangle or rectangle, or a complex shape composed of simple shapes. The cross-section of the constraint member 200 can be a simple shape such as a triangle or rectangle, or a complex shape composed of simple shapes.

[0105] The first direction X can be the height direction of the battery cell 100 or the length direction of the battery cell 100.

[0106] When multiple battery cells 100 are assembled into a group, the interconnection of the multiple battery cells 100 improves the overall stability. In this embodiment, by providing a limiting component 106 on the cover plate 105, and through the structural connection between the limiting member 200 and the limiting component 106, the overall structural connection strength of the group of multiple battery cells 100 is improved, the connection stability between the battery cells 100 and the limiting member 200 is improved, the risk of the limiting member 200 falling off is reduced, and the assembly quality when the battery cells 100 are assembled into a group is improved.

[0107] like Figure 4 As shown, in one embodiment of this application, the end cap assembly 102 further includes an electrode post assembly 130, an injection port 140, and a pressure relief valve 150 disposed on the cover plate 105. The electrode post assembly 130 is connected to the electrode assembly 103 and includes a positive electrode post 131 and a negative electrode post 132. The positive electrode post 131 and the negative electrode post 132 can be simultaneously disposed on one cover plate 105, or the positive electrode post 131 and the negative electrode post 132 can be separately disposed on two opposite cover plates 105. The injection port 140 is an important channel for injecting electrolyte into the battery. After the electrolyte injection operation is completed, the injection port 140 is sealed with a sealing pin to prevent electrolyte leakage and the entry of impurities and moisture from the external environment into the battery. The pressure relief valve 150 is a device used to automatically open to release pressure when the internal pressure of the battery cell 100 abnormally increases. The pressure relief valve 150 typically contains one or more elements that sense pressure changes.

[0108] For example, the limiting component 106 is disposed on the cover plate 105 to avoid the electrode post assembly 130, the injection hole 140 and the pressure relief valve 150. For example, along the length direction of the cover plate 105, the limiting component 106 is positioned between the positive electrode post 131 and the edge of the cover plate 105.

[0109] In another embodiment of the present application, the cover plate 105 is etched with a pole mark 133 for distinguishing the positive and negative poles. The pole mark 133 includes a positive pole mark 134 and a negative pole mark 135. The positive pole mark 134 is disposed between the edge of the cover plate 105 on the side facing away from the negative pole 132 and the positive pole 131. The negative pole mark 135 is disposed between the edge of the cover plate 105 on the side facing away from the positive pole 131 and the negative pole 132. The limiting assembly 106 is also spaced apart from the pole mark 133 on the cover plate 105. For example, along the length direction of the cover plate 105, the limiting assembly 106 is disposed between the positive pole 131 and the edge of the cover plate 105, and the limiting assembly 106 is spaced apart from the positive pole mark 134 by a distance of 1-10 mm, optionally 3-5 mm.

[0110] As shown in FIG. 1, in some embodiments of the present application, the limiting assembly 106 includes a recessed structure 106a recessed from the surface of the cover plate 105 towards the inside of the cover plate 105, and the recessed structure 106a extends through the cover plate 105 along the width direction of the cover plate 105. Figures 4 to 7

[0111] For example, the recessed structure 106a can be formed on the first surface 120 and / or the side surface 122 of the cover plate 105. In one example, the limiting assembly 106 includes a first recess 107 recessed from the first surface 120 of the cover plate 105 towards the inside of the cover plate 105. In another example, the limiting assembly 106 includes a second recess 108 recessed from the side surface 122 of the cover plate 105 towards the inside of the cover plate 105. Alternatively, the limiting assembly 106 includes both the first recess 107 and the second recess 108. One or more first recesses 107 can be provided on the first surface 120, for example, a plurality of first recesses 107 can be provided parallel to each other.

[0112] In one example, the cross-sectional shape of the first recess 107 and the cross-sectional shape of the second recess 108 can be the same or different. For example, the cross-sectional shape of the first recess 107 is a simple structure such as a semicircle, a triangle, a rectangle, a trapezoid, or a complex structure composed of simple structures. The cross-sectional shape of the second recess 108 is a simple structure such as a semicircle, a triangle, a rectangle, a trapezoid, or a complex structure composed of simple structures. For example, the first recess 107 can be recessed in the cover plate 105 along the first direction X, or can be recessed in the cover plate 105 along a direction having an angle with the first direction X.

[0113] In one example, the size of the first recess 107 and the size of the second recess 108 can be the same or different.

[0114] In one example, the thickness of the cover plate 105 is H, and the depth of the first recess 107 is less than H, for example, the depth of the first recess 107 is less than H / 2.​

[0115] The concave structure 106a penetrates the cover plate 105 along the width direction of the cover plate 105, in other words, the cover plate 105 includes two opposite side surfaces 122 along the width direction, and the concave structure 106a penetrates from one side surface 122 to the opposite side surface 122, so that the two opposite side surfaces 122 are communicated by the concave structure 106a. Exemplarily, when the battery cells 100 are arranged in groups, the battery cells 100 are arranged in rows and columns in an orderly manner, and the battery cells 100 in each row are sequentially arranged along the width direction of the cover plate 105. The concave structures 106a on the cover plate 105 are sequentially arranged along the width direction, and the concave structures 106a on the plurality of battery cells 100 as a whole tend to be coaxial. The limiting member 200 cooperates with the concave structures 106a in each row which are sequentially communicated along the width direction.

[0116] The concave structure 106a formed on the cover plate 105 accommodates at least part of the limiting member 200, and the limiting member 200 is limited by the concave structure 106a, so that the cover plate 105 and the limiting member 200 form a structural connection, thereby improving the connection stability of the battery cell 100 and the limiting member 200, and the concave structure 106a has a simple structure, which is convenient for manufacturing and installation of the limiting member 200.

[0117] As shown in FIG. 1, Figures 5 to 7 In some embodiments of the present application, the cover plate 105 includes a first surface 120 opposite to a second surface along a first direction X, and a side surface 122 connected to the first surface 120 and the second surface, the first surface 120 faces away from the opening, and the limiting assembly 106 is arranged on at least one of the first surface 120 and the side surface 122.

[0118] The cover plate 105 is connected to the opening of the shell 104, for example, the periphery of the cover plate 105 is welded to the shell 104, and the cover plate 105 at least partially protrudes from the shell 104 along the thickness direction. That is, the side surface 122 of the cover plate 105 is arranged between the first surface 120 and the shell 104 along the first direction X.

[0119] Exemplarily, the cover plate 105 is rectangular, the first surface 120 can be an upper surface, the second surface is a lower surface, the periphery of the cover plate 105 has the side surface 122, and the side surface 122 can include a group of opposite first side surfaces 122 and another group of opposite second side surfaces 122. When the battery cells 100 are arranged in rows and columns in an orderly manner, the first side surfaces 122 of the cover plates 105 of the battery cells 100 in each row are opposite to each other, and the second side surfaces 122 of the cover plates 105 of the battery cells 100 in each column are opposite to each other.

[0120] In one example, the limiting component 106 comprises a concave structure 106a which can be arranged on the first surface 120 and extends through the first side surface 122 in the width direction. The concave structure 106a can be arranged on the side surface 122, for example, the concave structure 106a can be arranged on the first side surface 122 and / or the second side surface 122.

[0121] In one example, the limiting component 106 comprises a concave structure 106a which can be arranged on the first surface 120 and extends through the first side surface 122 in the width direction. The concave structure 106a can be arranged on the side surface 122, for example, the concave structure 106a can be arranged on the first side surface 122 and / or the second side surface 122.

[0122] In another example, one limiting member 200 is arranged in the concave structure 106a of the first side surface 122 of one row of battery monomers 100, and another limiting member 200 is arranged in the concave structure 106a of the second side surface 122 of one row of battery monomers 100. Of course, the same limiting member 200 can be arranged in the concave structure 106a of the first side surface 122 and the second side surface 122 of different battery monomers 100.

[0123] In one example, the limiting component 106 comprises a concave structure 106a which can be arranged on the first surface 120 and extends through the first side surface 122 in the width direction. The concave structure 106a can be arranged on the side surface 122, for example, the concave structure 106a can be arranged on the first side surface 122 and / or the second side surface 122.

[0124] As shown in the drawings, Figure 6 In some embodiments of the present application, the radial width of the concave structure 106a decreases from the surface of the cover plate 105 to the inside of the cover plate 105.

[0125] The radial direction of the concave structure 106a is perpendicular to the extension direction of the concave structure 106a. The radial dimension of the concave structure 106a in the depth direction of the cover plate 105 varies, and the radial dimension decreases from the surface of the cover plate 105 to the inside of the cover plate 105, forming a certain inclination angle on the side wall of the concave structure 106a for guidance.

[0126] In one example, the cross-sectional shape of the concave structure 106a can be triangular, trapezoidal, or other shapes with a certain taper.

[0127] The gradually decreasing radial width of the concave structure 106a can facilitate the insertion of the limiting member 200.

[0128] In some embodiments of this application, the limiting component 106 is disposed on the first surface 120, the maximum thickness of the cover plate 105 is H, and the recess depth of the concave structure 106a ranges from 1 mm to H / 2.

[0129] The recess depth refers to the vertical depth from the first surface 120 to the second surface 121.

[0130] Exemplarily, the cover plate 105 can be a strip structure with uniform thickness or a strip structure with non-uniform thickness. In one example, the thickness H of the uniformly thick cover plate 105 ranges from 2 mm to 5 mm, and the recess depth of the recessed structure 106a ranges from 1 mm to 2.5 mm. In another example, to ensure the strength of the cover plate and a more stable structural connection between the recessed structure 106a and the restraining member 200, the local thickness of the cover plate with the recessed structure 106a is increased, for example, by thickening from the first surface 120 towards the second surface 121, or by thickening from the second surface 121 towards the first surface 120, resulting in a cover plate 105 with non-uniform thickness. The thickness of the locally thickened portion of the cover plate 105 ranges from 3.5 mm to 9 mm. The corresponding recess depth of the recessed structure 106a ranges from 1.75 mm to 4.5 mm. As examples, the recess depth of the recessed structure 106a is 1 mm, 2 mm, 2.5 mm, 3 mm, and 4 mm.

[0131] In one example, the recess depth of the concave structure 106a is greater than or equal to 1 mm, resulting in a relatively stable structural connection between the constricting member 200 and the concave structure 106a. The contact area between the constricting member 200 and the cover plate 105 within the concave structure 106a is increased, and it has sufficient limiting height along the radial direction of the concave structure 106a. The recess depth of the concave structure 106a is less than or equal to H / 2, reducing the impact of the concave structure 106a on the rigidity of the cover plate 105 and ensuring the structural stability of the battery cell 100.

[0132] Figure 9 Another structural schematic diagram of the limiting member 106b provided in some embodiments of this application; Figure 10 This is another structural schematic diagram of the limiting member 106b provided in some embodiments of this application.

[0133] like Figures 8 to 10 As shown, in some embodiments of this application, the limiting component 106 includes a limiting member 106b disposed on the side of the cover plate 105 away from the opening. The limiting member 106b has at least one limiting channel 123, and the axis of the limiting channel 123 extends along the width direction of the cover plate 105.

[0134] The limiting member 106b is a structure protruding from the cover plate 105 for structurally connecting the limiting member 200. The limiting assembly 106 can include one or more limiting members 106b, which are protrudingly arranged on the first surface 120 of the cover plate 105.

[0135] The limiting member 106b can be a cuboid, a cylinder, a sphere, or other three-dimensional structures, or can be a regular or irregular structure in the form of a sheet or a plate.

[0136] The limiting channel 123 is a channel formed on the limiting member 106b and extending through the limiting member 106b. The limiting member 200 is at least partially arranged in the limiting channel 123. The limiting member 106b has one or more independent limiting channels 123. The axes of the plurality of limiting channels 123 can extend in the width direction of the cover plate 105 and be arranged in parallel.

[0137] In some embodiments, the limiting member 106b includes a column extending continuously in the width direction of the cover plate 105, the limiting channel 123 includes a through hole extending through the column in the extension direction of the limiting member 106b, the through hole has a closed hole wall in the radial direction, and the limiting member 200 is connected to the cover plate 105 by penetrating the through hole. The cross section of the through hole can be circular, rectangular, triangular, or other shapes.

[0138] In other embodiments, the limiting member 106b includes a column extending in the width direction of the cover plate 105, the limiting channel 123 extends through the column in the extension direction of the limiting member 106b and communicates with the outside in the radial direction. In other words, the limiting channel 123 includes a through hole extending through the column in the extension direction of the limiting member 106b and a gap extending through the limiting member 106b in the radial direction, the through hole and the gap are in communication, and the gap extends in the extension direction of the limiting member 106b.

[0139] In one example, the gap of the limiting member 106b faces the first surface 120 of the cover plate 105, or the gap of the limiting member 106b faces away from the first surface 120 of the cover plate 105.

[0140] In another example, the limiting member 106b includes two parallel through holes and two gaps, the two gaps are oppositely arranged, the two gaps are respectively in communication with the two through holes, and one limiting member 106b can be structurally connected to two limiting members 200.

[0141] In other embodiments, the limiting member 106b includes a plurality of plate members arranged in the width direction of the cover plate 105, each plate member has a limiting channel 123, and the plurality of limiting channels 123 are in communication for penetrating the limiting member 200.

[0142] The limiting member 106b is arranged on the cover plate 105, which can improve the overall rigidity of the end cover assembly 102. The limiting member 200 is arranged in the limiting channel 123, which can realize the structural connection between the cover plate 105 and the limiting member 200, and improve the structural connection strength between the limiting member 200 and the battery monomer 100.

[0143] As shown in Figure 8 and Figure 10 In some embodiments, the limiting channel 123 is arranged through the partial limiting member 106b in the radial direction.

[0144] The radial direction is any direction in the cross section of the limiting member 106b. The cross section is a plane obtained by cutting the limiting member 106b in a direction perpendicular to the extension direction of the limiting member 106b. The limiting channel 123 includes a through hole extending in the width direction and a notch, and the notch and the through hole are communicated, so that the limiting member 200 is accommodated into the through hole from the notch.

[0145] The limiting channel 123 can pass through the partial limiting member 106b in the radial direction. For example, the notch of the limiting channel 123 faces the first surface 120 of the cover plate 105 or faces away from the first surface 120 of the cover plate 105 or other directions.

[0146] In one example, the limiting member 106b can include a plurality of limiting channels 123, for example, the limiting member 106b includes two limiting channels 123, and the notches of the two limiting channels 123 are arranged in opposite directions. Two limiting members 200 are respectively accommodated in the two limiting channels 123.

[0147] The limiting channel 123 passes through the limiting member 106b in the radial direction, which facilitates the placement of the limiting member 200 in the limiting channel 123.

[0148] Figure 11 A partial top view of one example of the limiting member 106b provided for some embodiments of the present application; Figure 12 A partial top view of another example of the limiting member 106b provided for some embodiments of the present application.

[0149] As shown in Figure 11 In some embodiments of the present application, at least two limiting members 106b are arranged in the width direction of the cover plate 105, and the limiting channels 123 of the respective limiting members 106b are coaxially arranged.

[0150] The limiting member 106b can be block-shaped or sheet-shaped. The interval arrangement of a plurality of limiting members 106b can reduce the mass of the limiting member 106b, and reduce the connection area between the limiting member 106b and the cover plate 105, thereby reducing the influence on the structure of the cover plate 105. Moreover, the plurality of limiting members 106b are collectively connected with the limiting member 200, which can ensure the stable connection between the limiting member 200 and the limiting member 106b.

[0151] For example, the plurality of limiting members 106b are arranged along the width direction of the cover plate 105 at intervals, the plurality of limiting members 106b limit the entrance direction of the limiting passages 123 to be consistent, and the limiting passages 123 are coaxial, thereby facilitating the penetration of the limiting member 200 through the plurality of limiting members 106b.

[0152] In embodiments, the limiting member 200 is in the form of a strip or a plate extending in a direction, and has a certain rigidity to ensure the stability of the connection. Therefore, the limiting passages 123 of the plurality of limiting members 106b are coaxial, thereby facilitating the penetration of the limiting member 200 through the plurality of limiting members 106b.

[0153] In another example, the limiting assembly 106 includes two rows of limiting members 106b parallel along the width direction, and the limiting passages 123 are formed between the two rows of limiting members 106b. Each row of limiting members 106b includes a plurality of plate members arranged at intervals along the width direction. Of course, in other examples, the limiting assembly 106 can include a plurality of rows of limiting members 106b parallel along the width direction, and the limiting passages 123 are formed between adjacent two rows of limiting members 106b.

[0154] By arranging the plurality of limiting members 106b at intervals, the influence of the connection of the limiting members 106b on the cover plate 105 is reduced, and the stable connection between the limiting member 200 and the limiting member 106b is improved, thereby reducing the risk of connection failure of the limiting member 200 and the battery monomer 100.

[0155] As shown in FIG. 1, Figure 12 In some embodiments of the present application, the limiting member 106b extends continuously along the width direction of the cover plate 105, and the limiting passage 123 penetrates the limiting member 106b along the extension direction of the limiting member 106b.

[0156] For example, the limiting member 106b includes a cuboid extending along the width direction of the cover plate 105, which can be a rectangular cuboid, a cylindrical body, or a regular or irregular solid structure such as a polygonal prism.

[0157] The limiting passage 123 is arranged to penetrate the limiting member 106b along the extension direction of the limiting member 106b, so that when the battery monomer 100 is grouped, the plurality of limiting passages 123 are connected, thereby facilitating the penetration of the limiting member 200 through the limiting member 106b.

[0158] The extension of the limiting member 106b can increase the contact area of the limiting member 200 and the limiting member 106b in the limiting passage 123, thereby improving the stable connection of the limiting member 200 and the limiting member 106b.

[0159] Figure 13 A top view of the battery device 11 provided for some embodiments of the present application is shown in FIG. 1; Figure 14 A partial sectional view of the battery device 11 provided for some embodiments of the present application is shown in FIG. 2.

[0160] AsFigure 13 As shown, this application also provides a battery device 11, including: a battery cell group 110 and a limiting member 200. The battery cell group 110 includes at least one battery cell 100 provided in the above embodiments arranged in a row. The limiting member 200 is limited and connected to the limiting component 106 of the row of battery cells 100 in the battery cell group 110.

[0161] In some embodiments, the battery cell group 110 is typically formed by arranging a plurality of battery cells 100; as an example, the battery cell group 110 can be a battery module, which is formed by arranging and fixing a plurality of battery cells 100 into an independent module. As an example, a battery module can be formed by binding a plurality of battery cells 100 together with cable ties.

[0162] The restraining member 200 extends along the width direction of the cover plate 105. The restraining member 200 can be a strip, cylinder, prism, or other shape that matches the limiting component 106. The restraining member 200 can be made of a material with high rigidity, such as metal, alloy, or composite material. Rigidity refers to the ability of an object to resist deformation or damage when subjected to external forces. For example, the restraining member 200 can be made of steel, titanium alloy, titanium, iron, etc.

[0163] The constrictor 200 avoids other structures of the battery cell pack 110. For example, the constrictor 200 is spaced apart from the busbars that electrically connect the individual battery cells 100 in the battery cell pack 110.

[0164] For example, the limiting component 106 includes a concave structure 106a, and the limiting member 200 is connected to the concave structure 106a of one or more battery cell groups 110. The radial dimension of the limiting member 200 may be greater than the radial dimension of the concave structure 106a. The limiting member 200 is in close contact with the concave structure 106a, and the concave structure 106a limits the limiting member 200 in the radial direction.

[0165] In other examples, the constraint member 200 contacts other structures of the battery device 11. The constraint member 200 is fixedly abutted against the battery device 11. For example, the opposite ends of the constraint member 200 can also be connected to the battery device 11, such as by welding, snapping, or bonding the ends of the constraint member 200 to the battery cell 100. Alternatively, the ends of the constraint member 200 can be fixedly connected to other structures of the battery device 11.

[0166] like Figure 14 As shown, in some embodiments, the battery device 11 further includes a housing 111, in which the battery cell group 110 and the restraining member 200 are placed, and the side of the restraining member 200 facing away from the battery cell 100 abuts against the housing 111.

[0167] In some embodiments, the limiting assembly 106 includes a recess structure 106a formed in the cover plate 105, and a portion of the limiting member 200 is disposed in the recess structure 106a, and the limiting member 200 abuts against the box body 111.

[0168] The limiting member 200 includes a fitting portion 201 and a limiting portion 202 disposed along the first direction X, the limiting portion 202 is accommodated in the recess structure 106a and is in limiting connection with the recess structure 106a, and the fitting portion 201 protrudes out of the recess structure 106a and abuts against the box body 111.

[0169] For example, the box body 111 can include a first box body 112 and a second box body 113. The first box body 112 and the second box body 113 are buckled to form a closed space inside the box body 111 to accommodate the battery monomer group 110. One side of the fitting portion 201 away from the limiting portion 202 abuts against one of the first box body 112 or the second box body 113. For example, taking the first box body 112 as an example, the first box body 112 includes a top plate and a side plate surrounding the circumference of the top plate, and the fitting portion 201 abuts against the top plate of the first box body 112.

[0170] The abutment of the box body 111 improves the connection stability of the limiting member 200 and the battery monomer 100.

[0171] Figure 15 A structural schematic diagram of the limiting member 200 provided in some embodiments of the present application is shown.

[0172] As shown in Figure 15 In some embodiments of the present application, the limiting member 200 includes a fitting portion 201 and a limiting portion 202, the fitting portion 201 includes oppositely disposed first and second fitting surfaces 203 and 204, the limiting portion 202 protrudes along the thickness direction from the first fitting surface 203, the radial dimension of the fitting portion 201 is greater than that of the limiting portion 202, the limiting portion 202 is in limiting connection with the limiting assembly 106, and the second fitting surface 204 abuts against the box body 111.

[0173] The limiting assembly 106 can include a recess structure 106a formed in the first surface 120 or the side surface 122, the limiting portion 202 is disposed in the recess structure 106a, and the fitting portion 201 protrudes out of the recess structure 106a. Alternatively, the limiting assembly 106 includes a limiting member 106b, and the limiting channel 123 penetrates through the limiting member 106b along the radial direction. The limiting portion 202 is disposed in the limiting channel 123, and the fitting portion 201 protrudes out of the limiting channel 123 through the gap.

[0174] The fitting part 201 and the limiting part 202 can be integrally formed or connected in parts to form the limiting piece 200. The material of the fitting part 201 and the limiting part 106b can be the same or different. The first fitting surface 203 and the second fitting surface 204 can be oppositely arranged along the first direction X, and the first fitting surface 203 and the second fitting surface 204 can be flat surfaces or curved surfaces.

[0175] The shape of the limiting part 202 matches the shape of the limiting assembly 106. Exemplarily, the cross section of the limiting part 202 is triangular, and the fitting part 201 can be plate-shaped.

[0176] The radial dimension of the fitting part 201 is greater than the radial dimension of the limiting part 202. Exemplarily, the limiting part 202 is disposed in the middle of the fitting part 201 and continuously extends along the extension direction of the fitting part 201. Alternatively, the limiting part 202 is disposed in the middle of the fitting part 201 and is arranged at intervals along the extension direction of the fitting part 201.

[0177] The radial dimension of the fitting part 201 is greater than the radial dimension of the limiting part 202, so that part of the first fitting surface 203 is in contact with the cover plate 105, preventing the limiting part 202 from excessively pressing the cover plate 105 when the box body 111 abuts against the second fitting surface 204, thereby causing the cover plate 105 to deform.

[0178] Figure 16 A battery paste laying state schematic diagram is provided for some embodiments of the present application.

[0179] As shown in the drawings, Figure 16 In some embodiments of the present application, the battery device 11 further comprises a battery patch 114, which covers the side of the battery monomer group 110 where the limiting piece 200 is located. The battery patch 114 comprises a hollow area 115, which is arranged corresponding to the limiting assembly 106. The limiting piece 200 penetrates the hollow area 115 and is limitedly connected with the limiting assembly 106 along the first direction X.

[0180] The size of the hollow area 115 matches the limiting assembly 106, facilitating the limiting assembly 106 to leak out. The hollow area 115 of the battery patch 114 can be continuous or discontinuous.

[0181] Exemplarily, the limiting part 202 of the limiting piece 200 penetrates the hollow area 115 and is limitedly connected with the limiting assembly 106, and the fitting part 201 of the limiting piece 200 abuts against the battery patch 114.

[0182] The limiting assembly 106 is arranged on the first surface 120 of the cover plate 105, and the limiting assembly 106 penetrates the hollow area 115 of the battery patch 114 and is connected with the battery monomer 100, thereby improving the close-fitting degree of the battery patch 114 and the cover plate 105 and improving the insulation and protection effect on the end cover assembly 102.

[0183] In a third aspect, the present application provides a battery device, comprising the battery device 11 of any one of the second aspect.

[0184] As shown in Figures 3 to 6 According to some embodiments of the present application, the present application provides a prismatic battery, comprising a housing 104, an end cover assembly 102 and an electrode assembly 103, the housing 104 has an opening at one end along a first direction X, the electrode assembly 103 is disposed in the housing 104, the end cover assembly 102 comprises a cover plate 105 and a limiting assembly 106, the cover plate 105 closes the opening. The limiting assembly 106 is arranged on the first surface 120 of the cover plate 105 away from the opening. The end cover assembly 102 comprises a pole post assembly 130 and a pole post mark 133 arranged on the cover plate 105, the pole post assembly 130 comprises a positive pole post 131 and a negative pole post 132 arranged along the length direction of the cover plate 105. The pole post mark 133 is etched on the first surface 120 of the cover plate 105.

[0185] The limiting assembly 106 comprises a recess structure 106a penetrating through the cover plate 105 along the width direction of the cover plate 105. The recess structure 106a is arranged on the cover plate 105 between the positive pole post mark 134 and the positive pole post 131. The distance between the recess structure 106a and the axis of the positive pole post 131 is 6 mm. The distance between the recess structure 106a and the positive pole post mark 134 is 4 mm.

[0186] The cross section of the recess structure 106a is triangular, and the radial dimension of the recess structure 106a decreases from the first surface 120 to the opening direction. The depth of the recess structure 106a is H / 2, for example, the depth of the recess structure 106a is 2 mm. The radial dimension of the recess structure 106a on the first surface 120 is 3 mm.

[0187] As shown in Figures 13 to 16 The present application provides a battery device 11, comprising a plurality of prismatic batteries arranged in rows and columns, a battery patch 114, a box 111, a current collecting component and a limiting piece 200. The plurality of prismatic batteries arranged in rows and columns are arranged in the box 111, the plurality of prismatic batteries arranged in rows and columns are electrically connected through the current collecting component, and the battery patch 114 covers the cover plate 105 of the plurality of prismatic batteries arranged in rows and columns. The recess structure 106a of the prismatic batteries in each row is limitedly connected with one limiting piece 200, and the number of the limiting pieces 200 corresponds to the number of rows of the prismatic batteries. The limiting pieces 200 are arranged at intervals from the current collecting component.

[0188] The limiting piece 200 comprises a limiting part 202 and a matching part 201, the limiting part 202 is protrudingly arranged in the middle of the matching part 201, and the cross section of the limiting part 202 is triangular. The limiting part 202 cooperates with the recess structure 106a, the surface of the limiting part 202 of the matching part 201 is in contact with the cover plate 105, and the surface of the matching part 201 away from the limiting part 202 is in abutment with the inner wall of the box 111.

[0189] The battery patch 114 is provided with a hollow area 115, and the limiting part 202 of the limiting part 200 penetrates through the hollow area 115 and is in limiting connection with the concave structure 106a.

[0190] Although the present application has been described with reference to the preferred embodiments, various modifications can be made to it without departing from the scope of the application, and equivalent components can be substituted therefor, especially, 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, characterized by, The battery device comprises: a shell having an opening at at least one end in a first direction; an electrode assembly at least partially accommodated in the shell; an end cover assembly closing the opening, the end cover assembly comprising a cover plate and a limiting assembly provided on the cover plate, the limiting assembly being capable of limiting connection with a limiting member of the battery cell.

2. The battery cell of claim 1, wherein, The limiting assembly comprises a recess structure recessed from a surface of the cover plate to an inside of the cover plate, and the recess structure is provided through the cover plate in a width direction of the cover plate.

3. The battery cell of claim 2, wherein, The recess structure has a decreasing trend in a radial width from the surface of the cover plate to the inside of the cover plate.

4. The battery cell according to claim 2 or 3, characterized in that, The cover plate comprises a first surface, a second surface and a side surface connected to the first surface and the second surface in opposite directions in the first direction, the first surface facing away from the opening, and the limiting assembly is provided on at least one of the first surface and the side surface.

5. The battery cell of claim 4, wherein, The limiting assembly is provided on the first surface, a local maximum thickness of the cover plate is H, and a recess depth of the recess structure ranges from 1 mm to H / 2.

6. The battery cell of any one of claims 1 to 5, wherein, The limiting assembly comprises a limiting member provided on a side of the cover plate facing away from the opening, the limiting member being provided with at least one limiting channel, and an axis of the limiting channel extends in the width direction of the cover plate.

7. The battery cell of claim 6, wherein, At least two limiting members are provided in the width direction of the cover plate, and the limiting channels of each limiting member are coaxially provided.

8. The battery cell of claim 6, wherein, The limiting member is provided in a continuous extension in the width direction of the cover plate, and the limiting channel extends through the limiting member in the extension direction of the limiting member.

9. The battery cell of any one of claims 6 to 8, wherein, The limiting channel is provided through part of the limiting member in at least one direction in a cross section.

10. A battery device characterized by comprising: The battery device comprises: a battery cell group comprising at least one battery cell as claimed in any one of claims 1 to 9 arranged in a row; a limiting member limiting connection with the limiting assembly of the battery cell arranged in a row in the battery cell group.

11. The battery device of claim 10, wherein, Further comprising a box, the battery cell group and the limiting member are arranged in the box, and a side of the limiting member facing away from the battery cell abuts against the box.

12. The battery device of claim 11, wherein, The limiting member comprises a fitting part and a limiting part, the fitting part comprises a first fitting surface and a second fitting surface arranged oppositely, the limiting part is provided in a protrusion in a thickness direction on the first fitting surface, a radial dimension of the fitting part is greater than a radial dimension of the limiting part, the limiting part is in limiting connection with the limiting assembly, and the second fitting surface abuts against the box.

13. The battery device according to any one of claims 10 to 12, characterized by, Further comprising a battery patch, the battery patch covers a side of the limiting member of the battery cell group, the battery patch comprises a hollow area, the hollow area is provided correspondingly to the limiting assembly, and the limiting member extends through the hollow area and is in limiting connection with the limiting assembly in the first direction.

14. An electrical device, comprising: The battery device comprises any one of claims 10 to 13.

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