End cover assembly, battery monomer, battery and electric device

Abstract

The embodiment of the utility model provides an end cover assembly, a battery monomer, a battery and a power utilization device, the end cover assembly is used for the battery monomer, the battery monomer comprises an electrode assembly and an insulating film wrapping the electrode assembly, the insulating film is provided with a positioning hole, the end cover assembly comprises an end cover and an insulating part, the insulating part comprises a first surface, a second surface and a connecting surface, the first surface faces the end cover, the second surface deviates from the end cover, the connecting surface surrounds between the first surface and the second surface and is connected with the first surface and the second surface, the insulating part further comprises a positioning bulge, and the positioning bulge is arranged on the connecting surface and is used for being matched with a positioning hole of an insulating film in an inserting manner. The production efficiency of the battery monomer can be improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to an end cover assembly, a battery cell, a battery, and an electrical device. Background Art

[0002] Battery monomers are widely used in electronic devices, such as mobile phones, laptop computers, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.

[0003] In the development of battery technology, how to improve the production efficiency of battery cells is a research direction in battery technology. Utility Model Content

[0004] The present application provides an end cover assembly, a battery cell, a battery and an electrical device, which can improve the production efficiency of the battery cell.

[0005] An embodiment of the present application provides an end cap assembly for a battery cell. The battery cell includes an electrode assembly and an insulating film that wraps the electrode assembly. The insulating film is provided with a positioning hole. The end cap assembly includes an end cap and an insulating member. The insulating member includes a first surface, a second surface, and a connecting surface. The first surface faces the end cap, and the second surface faces away from the end cap. The connecting surface surrounds the first surface and the second surface and connects the first surface and the second surface. The insulating member also includes a positioning protrusion, which is arranged on the connecting surface. The positioning protrusion is used to be plugged into and matched with the positioning hole of the insulating film.

[0006] In the above technical scheme, the end cap assembly of the embodiment of the present application forms a limiting effect by setting a positioning protrusion on the connecting surface, and the positioning protrusion is plugged into and cooperates with the positioning hole of the insulating film, thereby reducing the displacement of the insulating film due to movement during the fusion connection, improving the accuracy of the position of the insulating film when it is fusion-connected with the end cap assembly, facilitating the fusion connection, and improving the efficiency of the fusion connection, that is, improving the production efficiency of the battery cell.

[0007] In some embodiments, there are multiple positioning protrusions, and the multiple positioning protrusions are arranged on the connecting surface at intervals along the circumferential direction of the connecting surface.

[0008] In the above technical solution, a plurality of positioning protrusions are provided and arranged along the circumferential direction of the connection surface. More positioning protrusions can further increase the positioning area of ​​the insulating film relative to the end cover assembly, thereby further improving the position accuracy of the insulating film and improving the efficiency of the fusion connection.

[0009] In some embodiments, the end cap assembly further includes a first pole and a second pole with opposite polarities, and the first pole and the second pole are both arranged on the end cap; a positioning protrusion is provided on at least one of the two opposite sides of the connecting surface along a first direction, the first direction intersects with the second direction, and the second direction is parallel to the arrangement direction from the first pole to the second pole.

[0010] In the above technical solution, for a square battery cell, the two opposite sides of the connecting surface along the first direction correspond to the surfaces with the largest area of ​​the battery cell, and the insulating film is easily displaced on this surface. Therefore, the positioning protrusion is arranged on at least one side of the two opposite sides of the connecting surface along the first direction, which can reduce the movement displacement on this side, improve the position accuracy of the fusion connection of the insulating film, and improve the efficiency of the fusion connection.

[0011] In some embodiments, positioning protrusions are respectively provided on opposite sides of the connecting surface along the first direction.

[0012] In the above technical solution, the positioning area of ​​the insulating film relative to the insulating member can be increased, the displacement of the insulating film due to movement during the fusion connection can be reduced, the position accuracy of the fusion connection of the insulating film can be further improved, and the efficiency of the fusion connection can be improved.

[0013] In some embodiments, a positioning protrusion is provided on at least one of the two opposite sides of the connecting surface along the second direction.

[0014] In the above technical solution, the positioning area of ​​the insulating film relative to the insulating member can be further increased, the displacement of the insulating film due to movement during the fusion connection can be reduced, the position accuracy of the fusion connection of the insulating film can be further improved, and the efficiency of the fusion connection can be improved.

[0015] In some embodiments, positioning protrusions are respectively provided on opposite sides of the connecting surface along the second direction.

[0016] In the above technical solution, the positioning area of ​​the insulating film relative to the insulating member can be further increased, the displacement of the insulating film due to movement during the fusion connection can be reduced, the position accuracy of the fusion connection of the insulating film can be further improved, and the efficiency of the fusion connection can be improved.

[0017] In some embodiments, the positioning protrusion is configured to be loosely matched with the positioning hole of the insulating film.

[0018] In the above technical solution, the positioning protrusion is configured to be loosely matched with the positioning hole of the insulating film, which can facilitate the positioning protrusion to be inserted into the positioning hole of the insulating film, thereby improving the assembly efficiency of the insulating member and the insulating film, that is, improving the production efficiency of the battery cell.

[0019] In some embodiments, the entire circumference of the positioning protrusion has a gap with the hole wall of the positioning hole, and the size of the gap is h1, and h1 satisfies: 0.5mm≤h1≤1.5mm.

[0020] In the above technical scheme, the gap between the positioning protrusion and the wall of the positioning hole is limited to greater than or equal to 0.5 mm, which can improve the convenience of inserting the positioning protrusion into the positioning hole, thereby improving the assembly efficiency; the gap between the positioning protrusion and the wall of the positioning hole is limited to less than or equal to 1.5 mm, which can reduce the situation where the insulating film is inaccurately positioned due to excessive gap.

[0021] In some embodiments, h1 satisfies: 0.5 mm ≤ h1 ≤ 1 mm.

[0022] In the above technical solution, the gap between the positioning protrusion and the hole wall of the positioning hole is further limited to less than or equal to 1 mm, which can further reduce the inaccurate positioning of the insulating film due to the excessive gap and improve the accuracy of the position when the insulating film is melt-connected.

[0023] In some embodiments, the positioning protrusion is configured to protrude from the insulating film.

[0024] In the above technical solution, the positioning protrusion is configured to protrude from the insulating film, which can reduce the possibility of misalignment between the insulating film and the insulating member during fusion connection, thereby causing the insulating film to move, and improve the position accuracy of the insulating film during fusion connection, thereby improving the efficiency of the fusion connection.

[0025] In some embodiments, the end cap assembly also includes a first pole and a second pole with opposite polarities, the first pole and the second pole are both arranged on the end cap, and the positioning protrusion is arranged on at least one side of the connecting surface along the first direction opposite to each other, the first direction intersects with the second direction, and the second direction is parallel to the arrangement direction from the first pole to the second pole; the size of the part of the positioning protrusion protruding from the insulating film along the first direction is h2, and h2 satisfies: 0.5mm≤h2≤1.5mm.

[0026] In the above technical solution, the size of the part of the positioning protrusion protruding from the insulating film along the first direction X is limited to be greater than or equal to 0.5 mm, which can make the positioning protrusion more obvious and further reduce the possibility of movement of the insulating film; the size of the part of the positioning protrusion protruding from the insulating film along the first direction is limited to be less than or equal to 1.5 mm to alleviate the situation where subsequent welding is difficult due to the excessive size of the positioning protrusion.

[0027] In some embodiments, h2 satisfies: 0.5 mm ≤ h2 ≤ 1 mm.

[0028] In the above technical solution, the size of the portion of the positioning protrusion protruding from the insulating film along the first direction is further limited to be less than or equal to 1 mm, so as to further alleviate the difficulty of subsequent welding due to the excessive size of the positioning protrusion.

[0029] In the second aspect, an embodiment of the present application also provides a battery cell, including a shell, an electrode assembly, an insulating film and the above-mentioned end cover assembly, the shell has a accommodating cavity and an opening connected to the accommodating cavity, the electrode assembly is located in the accommodating cavity, the insulating film is located in the accommodating cavity and wraps the electrode assembly, the end cover is covered at the opening of the shell, the insulating member is located between the end cover and the electrode assembly, the insulating film is provided with a positioning hole, the positioning protrusion is inserted into the positioning hole and connected to the insulating film.

[0030] In a third aspect, an embodiment of the present application further provides a battery, comprising the above-mentioned battery cell.

[0031] In a fourth aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery, and the battery is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the drawings without paying creative work.

[0033] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0034] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application;

[0035] Figure 3 A schematic diagram of the structure of multiple battery cells provided in some embodiments of the present application;

[0036] Figure 4 A schematic diagram of the structure of an end cap assembly provided in some embodiments of the present application;

[0037] Figure 5 A partial structural schematic diagram of a battery cell provided in some embodiments of the present application;

[0038] Figure 6 for Figure 5 The enlarged view of point A in the middle;

[0039] Figure 7 Another partial structural schematic diagram of a battery cell provided in some embodiments of the present application;

[0040] Figure 8 A schematic diagram of another partial structure of a battery cell provided in some embodiments of the present application;

[0041] Fig. 9 This is a schematic diagram of the structure of the insulating film in the battery cell before forming in some embodiments of the present application.

[0042] The reference numerals of the specific embodiments are as follows:

[0043] 1. Vehicle; 2. Battery; 3. Controller; 4. Motor; 5. Battery cell; 6. Box; 7. End cover assembly; 8. Shell; 9. Insulation film; 91. Positioning hole; 92. Bottom; 93. First side; 94. Second side; 10. Battery module;

[0044] 71. End cap;

[0045] 72, insulating member; 721, first surface; 722, second surface; 723, connecting surface; 724, positioning protrusion;

[0046] 73. first pole; 74. second pole;

[0047] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0049] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

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

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

[0052] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0053] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0054] The term "plurality" used in the present application refers to two or more (including two).

[0055] In the present application, the battery cell may include a lithium-ion secondary battery cell, a lithium-ion primary battery cell, a lithium-sulfur battery cell, a sodium-lithium-ion battery cell, a sodium-ion battery cell or a magnesium-ion battery cell, etc., and the embodiments of the present application do not limit this. The battery cell may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this.

[0056] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. The battery generally includes a box for encapsulating one or more battery cells. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0057] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. A battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. The positive electrode sheet includes a positive current collector and a positive active material layer. The positive active material layer is coated on the surface of the positive current collector. The positive current collector includes a positive coating area and a positive electrode ear connected to the positive coating area. The positive coating area is coated with a positive active material layer, and the positive electrode ear is not coated with a positive active material layer. Taking a lithium-ion battery cell as an example, the material of the positive current collector can be aluminum, and the positive active material layer includes a positive active material. The positive active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector includes a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with a negative electrode active material layer. The material of the negative electrode current collector can be copper, and the negative electrode active material layer includes a negative electrode active material, and the negative electrode active material can be carbon or silicon, etc. The material of the separator can be PP (polypropylene) or PE (polyethylene), etc.

[0058] A battery cell generally includes a shell, an end cap assembly and an electrode assembly. The shell has a receiving cavity and an opening connected to the receiving cavity. The electrode assembly is located in the receiving cavity of the shell, and the end cap assembly covers the opening of the shell. The outer side of the electrode assembly is generally wrapped with a Mylar film to reduce the looseness of the electrode assembly, and the insulating film is generally connected to the end cap assembly by hot melt welding.

[0059] During hot melt welding, the Mylar film often moves, resulting in poor hot melt effect, increasing the possibility of rework and reducing the production efficiency of battery cells. When the Mylar film moves too much, it will also cause the Mylar film to be too high, that is, higher than the position where it should be welded, so that the Mylar film is deformed and cracked. At this time, the Mylar film needs to be replaced, which seriously affects production efficiency.

[0060] In view of this, the present application provides an end cover assembly, which provides a positioning protrusion on the insulating part, and the positioning protrusion is used to be plugged into and matched with the positioning hole of the insulating film. In this way, the end cover assembly and the insulating film form a limiting effect, thereby reducing the movement displacement of the insulating film, improving the accuracy of the position of the insulating film during welding, improving the hot melt effect, and then improving the production efficiency of the battery cell.

[0061] The end cap assembly described in the embodiments of the present application is applicable to a battery cell, a battery, and an electrical device using the battery.

[0062] The electrical device may be a vehicle, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The vehicle may be a fuel vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle, and the like; the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like; the electric tool may include a metal cutting electric tool, a grinding electric tool, an assembly electric tool, and an electric tool for railways, such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator, and an electric planer, and the like. The embodiments of the present application do not impose any special restrictions on the above-mentioned electrical devices.

[0063] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0064] Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application.

[0065] like Figure 1 As shown, a battery 2 is disposed inside the vehicle 1, and the battery 2 may be disposed at the bottom, head, or tail of the vehicle 1. The battery 2 may be used to power the vehicle 1, for example, the battery 2 may be used as an operating power source for the vehicle 1.

[0066] The vehicle 1 may further include a controller 3 and a motor 4 , wherein the controller 3 is used to control the battery 2 to supply power to the motor 4 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1 .

[0067] In some embodiments of the present application, the battery 2 can not only serve as an operating power source for the vehicle 1, but also serve as a driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0068] Figure 2 A schematic diagram of the structure of a battery provided in some embodiments of the present application; Figure 3 A schematic diagram of the structure of multiple battery cells provided in some embodiments of the present application;

[0069] like Figure 2 and Figure 3 As shown, the battery 2 includes a box body 6 and a battery cell 5. The box body 6 has a receiving space, and the battery cell 5 is arranged in the receiving space.

[0070] In the battery 2, there can be one or more battery cells 5. If there are more than one battery cells 5, the battery cells 5 can be connected in series, in parallel or in mixed connection. Mixed connection means that the battery cells 5 are both connected in series and in parallel. The battery cells 5 can be directly connected in series, in parallel or in mixed connection, and then the whole formed by the battery cells 5 is fixed to the box 6; of course, the battery modules 10 can also be formed by connecting the battery cells 5 in series, in parallel or in mixed connection, and then the battery modules 10 are connected in series, in parallel or in mixed connection to form a whole and fixed to the box 6.

[0071] Figure 4 A schematic diagram of the structure of the end cap assembly provided in some embodiments of the present application, Figure 5 A partial structural schematic diagram of a battery cell provided in some embodiments of the present application.

[0072] like Figure 3 , Figure 4 and Figure 5 As shown, the present application also provides a battery cell 5, which includes a shell 8, an electrode assembly, an insulating film 9 and an end cap assembly 7. The shell 8 has a receiving cavity and an opening connected to the receiving cavity, the electrode assembly is located in the receiving cavity, the insulating film 9 is located in the receiving cavity and wraps the electrode assembly, and the end cap assembly 7 covers the opening of the shell 8.

[0073] The shell 8 is a component used to cooperate with the end cap assembly 7 to form an internal environment of the battery cell 5, wherein the formed internal environment can be used to accommodate the electrode assembly, electrolyte and other components. The shell 8 can be of various shapes and sizes, such as a rectangular parallelepiped, a hexagonal prism, etc. Specifically, the shape of the shell 8 can be determined according to the specific shape and size of the electrode assembly. The material of the shell 8 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0074] The end cap assembly 7 refers to a component that covers the opening of the housing 8 to isolate the internal environment of the battery cell 5 from the external environment. Without limitation, the shape of the end cap assembly 7 can be adapted to the shape of the housing 8 to match the housing 8. Optionally, the end cap assembly 7 can also be provided with a pressure relief mechanism for releasing the internal pressure when the internal pressure or temperature of the battery cell 5 reaches a threshold value.

[0075] The electrode assembly is a component where electrochemical reactions occur in the battery cell 5. The housing 8 may contain one or more electrode assemblies.

[0076] Figure 6 for Figure 5 Enlarged view of point A in the middle.

[0077] like Figure 4-Figure 6As shown, the present application also provides an end cap assembly 7 for a battery cell 5, the battery cell 5 includes an electrode assembly and an insulating film 9 wrapping the electrode assembly, the insulating film 9 is provided with a positioning hole 91, the end cap assembly 7 includes an end cap 71 and an insulating member 72, the insulating member 72 includes a first surface 721, a second surface 722 and a connecting surface 723, the first surface 721 faces the end cap 71, the second surface 722 is away from the end cap 71, the connecting surface 723 surrounds the first surface 721 and the second surface 722, and connects the first surface 721 and the second surface 722, the insulating member 72 also includes a positioning protrusion 724, the positioning protrusion 724 is arranged on the connecting surface 723, and the positioning protrusion 724 is used to be plugged into and matched with the positioning hole 91.

[0078] Exemplarily, the end cover 71 may be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cover 71 is not easily deformed when squeezed or collided, so that the battery cell 5 can have a higher structural strength and the safety performance can also be improved.

[0079] The first surface 721 of the embodiment of the present application may be a plane, a curved surface, or a combination of a plane and a curved surface. The second surface 722 may be a plane, a curved surface, or a combination of a plane and a curved surface.

[0080] The first surface 721 and the second surface 722 of the embodiment of the present application are connected by a connecting surface 723. The connecting surface 723 can be a plane, a curved surface, or a plane and a curved surface combined. The connecting surface 723 is arranged in a ring shape.

[0081] The insulating member 72 of the embodiment of the present application is stacked with the end cover 71, and the two can be connected by bonding. The insulating member 72 of the embodiment of the present application can be made of plastic, plastic or rubber.

[0082] In the battery cell 5, the insulating member 72 is used to electrically isolate the end cap 71 from the electrode assembly. Exemplarily, the insulating member 72 abuts against the electrode assembly.

[0083] The positioning protrusion 724 of the embodiment of the present application is arranged on the connection surface 723, that is, the positioning protrusion 724 protrudes from the connection surface 723. The shape of the positioning protrusion 724 can be columnar, rectangular or other shapes. The number of the positioning protrusion 724 can be one or more.

[0084] The positioning protrusion 724 of the embodiment of the present application can be perpendicular to the connection surface 723, or can be inclined relative to the connection surface 723. The positioning protrusion 724 of the embodiment of the present application can be integrally formed with the connection surface 723, or can be welded to the connection surface 723.

[0085] The positioning protrusion 724 of the embodiment of the present application can be configured to be substantially consistent with the size of the positioning hole 91 of the insulating film 9, so that there is no gap when fitting together; the size of the positioning protrusion 724 can also be set to be smaller, and the size of the positioning hole 91 of the insulating film 9 is relatively larger, so that the positioning protrusion 724 and the positioning hole 91 of the insulating film 9 are loosely fitted.

[0086] Before fusion welding, the positioning protrusion 724 of the embodiment of the present application can be configured to be located in the positioning hole 91 of the insulating film 9 without protruding from the insulating film 9, or can pass through the positioning hole 91 of the insulating film 9 and thus protrude from the insulating film 9.

[0087] The end cap assembly 7 of the embodiment of the present application is provided with a positioning protrusion 724 on the connection surface 723, and the positioning protrusion 724 is plugged and matched with the positioning hole 91 of the insulating film 9 to form a limiting effect, thereby reducing the displacement of the insulating film 9 due to movement during the fusion connection, improving the accuracy of the position of the insulating film 9 when the end cap assembly 7 is fusion-connected, facilitating the fusion connection, improving the efficiency of the fusion connection, that is, improving the production efficiency of the battery cell 5. At the same time, it can also reduce the occurrence of the super-high phenomenon of the insulating film 9.

[0088] In some embodiments, there are multiple positioning protrusions 724 , and the multiple positioning protrusions 724 are arranged on the connecting surface 723 at intervals along the circumferential direction of the connecting surface 723 .

[0089] The number of the positioning protrusions 724 in the embodiment of the present application is at least two. The shapes of the plurality of positioning protrusions 724 may be the same, or different, or only a portion of the positioning protrusions 724 may have the same shape.

[0090] A plurality of positioning protrusions 724 are provided and arranged along the circumferential direction of the connection surface 723. More positioning protrusions 724 can further increase the positioning area of ​​the insulating film 9 relative to the end cover assembly 7, thereby further improving the position accuracy of the insulating film 9 and improving the efficiency of the fusion connection.

[0091] In some embodiments, the end cover assembly 7 further includes a first pole 73 and a second pole 74 with opposite polarities, and the first pole 73 and the second pole 74 are both arranged on the end cover 71; a positioning protrusion 724 is provided on at least one of the two opposite sides of the connecting surface 723 along the first direction X, the first direction X intersects with the second direction Y, and the second direction Y is parallel to the arrangement direction of the first pole 73 to the second pole 74.

[0092] The first pole 73 of the embodiment of the present application may be a positive pole or a negative pole, and correspondingly, the second pole 74 may be a negative pole or a positive pole.

[0093] The positioning protrusion 724 of the embodiment of the present application may be disposed on any one of the two opposite sides of the connecting surface 723 along the first direction X, or may be disposed on both the opposite sides.

[0094] The first direction X and the second direction Y of the embodiment of the present application are both perpendicular to the third direction Z, and the third direction Z is parallel to the arrangement direction of the end cap 71 to the insulating member 72. Optionally, the first direction X and the second direction Y are perpendicular.

[0095] For a square battery cell 5, the two opposite sides of the connection surface 723 along the first direction X correspond to the surfaces with the largest area of ​​the battery cell 5, and the insulating film 9 is prone to displacement on this surface. Therefore, a positioning protrusion 724 is provided on at least one of the two opposite sides of the connection surface 723 along the first direction X, so as to reduce the movement displacement on this side, improve the position accuracy of the fusion connection of the insulating film 9, and improve the efficiency of the fusion connection.

[0096] In some embodiments, two opposite sides of the connecting surface 723 along the first direction X are respectively provided with positioning protrusions 724 .

[0097] The number of the positioning protrusions 724 in the embodiment of the present application is multiple. Among them, the number of the positioning protrusions 724 on the opposite sides of the connecting surface 723 along the first direction X can be equal or different. The shapes of the positioning protrusions 724 on the opposite sides of the connecting surface 723 along the first direction X can be the same or different. Exemplarily, when there are multiple positioning protrusions 724 on one side, the shapes of the multiple positioning protrusions 724 on the side can be the same, or different, or only a part of the positioning protrusions 724 can have the same shape.

[0098] Such an arrangement can increase the positioning area of ​​the insulating film 9 relative to the insulating member 72, reduce the displacement of the insulating film 9 due to movement during the fusion connection, further improve the position accuracy of the fusion connection of the insulating film 9, and improve the efficiency of the fusion connection.

[0099] Figure 7 Another partial structural schematic diagram of a battery cell provided in some embodiments of the present application.

[0100] See also Figure 7 In some embodiments, at least one of the two opposite sides of the connecting surface 723 along the second direction Y is provided with a positioning protrusion 724.

[0101] The positioning protrusion 724 of the embodiment of the present application can be arranged on any one of the two opposite sides of the connecting surface 723 along the second direction Y, or can be arranged on both the two opposite sides.

[0102] By setting the positioning protrusion 724 on at least one of the two opposite sides of the connecting surface 723 along the second direction Y, the positioning area of ​​the insulating film 9 relative to the insulating part 72 can be further increased, the displacement of the insulating film 9 due to movement during the fusion connection can be reduced, the position accuracy of the fusion connection of the insulating film 9 can be further improved, and the efficiency of the fusion connection can be improved.

[0103] In some embodiments, two opposite sides of the connecting surface 723 along the second direction Y are respectively provided with positioning protrusions 724 .

[0104] The number of the positioning protrusions 724 in the embodiment of the present application is multiple. Among them, the number of the positioning protrusions 724 on the opposite sides of the connecting surface 723 along the second direction Y can be equal or different. The shapes of the positioning protrusions 724 on the opposite sides of the connecting surface 723 along the second direction Y can be the same or different. Exemplarily, when there are multiple positioning protrusions 724 on one side, the shapes of the multiple positioning protrusions 724 on the side can be the same, or different, or only a part of the positioning protrusions 724 can have the same shape.

[0105] Such an arrangement can further increase the positioning area of ​​the insulating film 9 relative to the insulating member 72, reduce the displacement of the insulating film 9 due to movement during the fusion connection, further improve the position accuracy of the fusion connection of the insulating film 9, and improve the efficiency of the fusion connection.

[0106] Please continue reading Figure 6 In some embodiments, the positioning protrusion 724 is configured to be loosely matched with the positioning hole 91 of the insulating film 9 .

[0107] The positioning protrusion 724 of the embodiment of the present application is gap-fitted with the positioning hole 91 of the insulating film 9. The circumferential side of the positioning protrusion 724 may be gap-fitted with the positioning hole 91 of the insulating film 9, or the positioning protrusion 724 may be gap-fitted with the positioning hole 91 of the insulating film 9 in one direction, for example, the positioning protrusion 724 is gap-fitted with the positioning hole 91 of the insulating film 9 in a third direction Z, and the third direction Z is parallel to the arrangement direction from the end cover 71 to the insulating member 72.

[0108] The positioning protrusion 724 is configured to be loosely matched with the positioning hole 91 of the insulating film 9, which can facilitate the positioning protrusion 724 to be inserted into the positioning hole 91 of the insulating film 9, thereby improving the assembly efficiency of the insulating member 72 and the insulating film 9, that is, improving the production efficiency of the battery cell 5.

[0109] In some embodiments, the entire circumference of the positioning protrusion 724 has a gap with the hole wall of the positioning hole 91 , and the size of the gap is h1 , and h1 satisfies: 0.5 mm≤h1≤1.5 mm.

[0110] Optionally, h1 is 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.2 mm or 1.5 mm.

[0111] Limiting the gap between the positioning protrusion 724 and the hole wall of the positioning hole 91 to greater than or equal to 0.5 mm can improve the convenience of inserting the positioning protrusion 724 into the positioning hole 91, thereby improving the assembly efficiency; limiting the gap between the positioning protrusion 724 and the hole wall of the positioning hole 91 to less than or equal to 1.5 mm can reduce the situation where the insulating film 9 is not accurately positioned due to the excessive gap.

[0112] In some embodiments, h1 satisfies: 0.5 mm ≤ h1 ≤ 1 mm.

[0113] Optionally, h1 is 0.5 mm, 0.6 mm, 0.8 mm or 1 mm.

[0114] Further limiting the gap between the positioning protrusion 724 and the hole wall of the positioning hole 91 to less than or equal to 1 mm can further alleviate the situation where the insulating film 9 is not positioned accurately due to the excessive gap, and improve the position accuracy of the insulating film 9 when it is melt-connected.

[0115] In some embodiments, the positioning protrusion 724 is configured to protrude from the insulating film 9 .

[0116] The positioning protrusion 724 of the embodiment of the present application can be arranged obliquely relative to the connection surface 723 to protrude from the insulating film 9 , or can be arranged vertically relative to the connection surface 723 to protrude from the insulating film 9 .

[0117] Configuring the positioning protrusion 724 to protrude from the insulating film 9 can reduce the possibility of misalignment between the insulating film 9 and the insulating member 72 during fusion connection, thereby causing the insulating film 9 to move, and improve the position accuracy of the insulating film 9 during fusion connection, thereby improving the efficiency of the fusion connection.

[0118] Please continue reading Figure 7 In some embodiments, the end cover assembly 7 further includes a first pole 73 and a second pole 74 with opposite polarities, and the first pole 73 and the second pole 74 are both arranged on the end cover 71; the positioning protrusion 724 is arranged on at least one side of the connecting surface 723 along the first direction X, the first direction X intersects with the second direction Y, and the second direction Y is parallel to the arrangement direction of the first pole 73 to the second pole 74; the size of the part of the positioning protrusion 724 protruding from the insulating film 9 along the first direction X is h2, and h2 satisfies: 0.5mm≤h2≤1.5mm.

[0119] Exemplarily, if the positioning protrusion 724 is disposed obliquely relative to the connection surface 723 , h2 represents the dimension of the inclined portion protruding from the insulating film 9 along the first direction X.

[0120] Optionally, h2 is 0.5mm, 0.7mm, 0.9mm, 1mm, 1.2mm or 1.5mm.

[0121] Limiting the size of the portion of the positioning protrusion 724 protruding from the insulating film 9 along the first direction X to be greater than or equal to 0.5 mm can make the positioning protrusion 724 protrude more obviously and further reduce the possibility of movement of the insulating film 9; limiting the size of the portion of the positioning protrusion 724 protruding from the insulating film 9 along the first direction X to be less than or equal to 1.5 mm to reduce the difficulty of subsequent welding due to the excessive size of the positioning protrusion 724.

[0122] In some embodiments, h2 satisfies: 0.5 mm ≤ h2 ≤ 1 mm.

[0123] Optionally, h2 is 0.5 mm, 0.6 mm, 0.8 mm or 1 mm.

[0124] The size of the portion of the positioning protrusion 724 protruding from the insulating film 9 along the first direction X is further limited to be less than or equal to 1 mm, so as to further alleviate the difficulty of subsequent welding due to the excessive size of the positioning protrusion 724.

[0125] Figure 8 A schematic diagram of another partial structure of a battery cell provided in some embodiments of the present application.

[0126] See also Figure 8 In some embodiments, the end cover assembly 7 further includes a first pole 73 and a second pole 74 with opposite polarities, and the first pole 73 and the second pole 74 are both arranged on the end cover 71; the positioning protrusion 724 is arranged on at least one side of the opposite sides of the connecting surface 723 along the second direction Y, and the second direction Y is parallel to the arrangement direction of the first pole 73 to the second pole 74; the size of the part of the positioning protrusion 724 protruding from the insulating film 9 along the second direction Y is h3, and h3 satisfies: 0.5mm≤h3≤1.5mm.

[0127] Exemplarily, if the positioning protrusion 724 is disposed obliquely relative to the connection surface 723 , h3 represents the dimension of the inclined portion protruding from the insulating film 9 along the second direction Y.

[0128] Optionally, h3 is 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.2 mm or 1.5 mm.

[0129] Limiting the size of the portion of the positioning protrusion 724 protruding from the insulating film 9 along the second direction Y to greater than or equal to 0.5 mm can make the positioning protrusion 724 protrude more obviously and further reduce the possibility of movement of the insulating film 9; limiting the size of the portion of the positioning protrusion 724 protruding from the insulating film 9 along the second direction Y to less than or equal to 1.5 mm to alleviate the difficulty of subsequent welding due to the excessive size of the positioning protrusion 724.

[0130] In some embodiments, h3 satisfies: 0.5 mm ≤ h3 ≤ 1 mm.

[0131] Optionally, h3 is 0.5 mm, 0.6 mm, 0.8 mm or 1 mm.

[0132] The size of the portion of the positioning protrusion 724 protruding from the insulating film 9 along the second direction Y is further limited to be less than or equal to 1 mm, so as to further alleviate the difficulty of subsequent welding due to the excessive size of the positioning protrusion 724.

[0133] The embodiment of the present application further provides a battery cell 5, which includes a shell 8, an electrode assembly, an insulating film 9 and an end cap assembly 7. The shell 8 has a receiving cavity, the electrode assembly is located in the receiving cavity and an opening communicating with the receiving cavity, the insulating film 9 is located in the receiving cavity and wraps the electrode assembly, the end cap 71 covers the opening of the shell 8, the insulating member 72 is located between the end cap 71 and the electrode assembly, the insulating film 9 is provided with a positioning hole 91, and the positioning protrusion 724 is inserted into the positioning hole 91 and connected to the insulating film 9.

[0134] Exemplarily, the positioning protrusion 724 and the insulating film 9 are connected by hot-melt welding.

[0135] Fig. 9 This is a schematic diagram of the structure of the insulating film in the battery cell before forming in some embodiments of the present application.

[0136] See also Fig. 9 The insulating film 9 includes a bottom 92, two first side portions 93 and two second side portions 94, the bottom 92 is located on the side of the electrode assembly away from the end cover assembly 7, the two first side portions 93 are respectively arranged on the opposite sides of the electrode assembly along the first direction X, and the two second side portions 94 are respectively arranged on the opposite sides of the electrode assembly along the second direction Y, wherein the second side portion 94 is a double-layer film structure, and at least one of the first side portion 93 and the second side portion 94 is provided with a positioning hole 91.

[0137] Exemplarily, the double-layer membrane structure of the second side portion 94 can be connected by hot-melt welding or bonding.

[0138] The embodiment of the present application further provides a battery 2, comprising the above-mentioned battery cell 5.

[0139] The embodiment of the present application also provides an electrical device, comprising the above-mentioned battery 2.

[0140] See also Figure 4-Figure 7The embodiment of the present application provides an end cap assembly 7 for a battery cell 5. The battery cell 5 includes an electrode assembly and an insulating film 9 wrapping the electrode assembly. The insulating film 9 is provided with a positioning hole 91. The end cap assembly 7 includes an end cap 71 and an insulating member 72. The insulating member 72 includes a first surface 721, a second surface 722 and a connecting surface 723. The first surface 721 faces the end cap 71, and the second surface 722 faces away from the end cap 71. The connecting surface 723 surrounds between the first surface 721 and the second surface 722, and connects the first surface 721 and the second surface 722. The insulating member 72 also includes a positioning protrusion 724. The positioning protrusion 724 is provided on the connecting surface 723. The positioning protrusion 724 is used to be plugged and matched with the positioning hole 91 of the insulating film 9. There are multiple positioning protrusions 724, and multiple positioning protrusions 724 are arranged on the connecting surface 723 at intervals along the surrounding direction of the connecting surface 723. The end cap assembly 7 further includes a first pole 73 and a second pole 74 with opposite polarities, and the first pole 73 and the second pole 74 are both arranged on the end cap 71; the connection surface 723 is provided with positioning protrusions 724 on opposite sides along the first direction X, the first direction X intersects with the second direction Y, and the second direction Y is parallel to the arrangement direction of the first pole 73 to the second pole 74. The connection surface 723 is provided with positioning protrusions 724 on opposite sides along the second direction Y. The positioning protrusions 724 are configured to be gap-matched with the positioning holes 91 of the insulating film 9. The positioning protrusions 724 are configured to protrude from the insulating film 9.

[0141] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0142] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein, but these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An end cap assembly for a battery cell, characterized in that: The battery cell comprises an electrode assembly and an insulating film wrapping the electrode assembly, wherein the insulating film is provided with a positioning hole, and the end cap assembly comprises: End caps; The insulating member comprises a first surface, a second surface and a connecting surface, wherein the first surface faces the end cover, the second surface faces away from the end cover, and the connecting surface surrounds the first surface and the second surface and connects the first surface and the second surface. The insulating member further comprises a positioning protrusion, which is arranged on the connecting surface and is used for plugging and matching with the positioning hole.

2. The end cap assembly according to claim 1, characterized in that: There are multiple positioning protrusions, and the multiple positioning protrusions are arranged on the connecting surface at intervals along the circumferential direction of the connecting surface.

3. The end cap assembly according to claim 1, characterized in that: The end cap assembly further comprises a first pole and a second pole with opposite polarities, wherein the first pole and the second pole are both arranged on the end cap; The positioning protrusion is provided on at least one of two opposite sides of the connecting surface along a first direction, the first direction intersects with a second direction, and the second direction is parallel to an arrangement direction from the first pole to the second pole.

4. The end cap assembly according to claim 3, characterized in that: The positioning protrusions are respectively provided on two opposite sides of the connecting surface along the first direction.

5. The end cap assembly according to claim 3, characterized in that: The positioning protrusion is disposed on at least one of the two opposite sides of the connecting surface along the second direction.

6. The end cap assembly according to claim 5, characterized in that: The positioning protrusions are respectively provided on two opposite sides of the connecting surface along the second direction.

7. The end cap assembly according to any one of claims 1 to 6, characterized in that: The positioning protrusion is configured to be loosely matched with the positioning hole.

8. The end cap assembly according to claim 7, characterized in that: The entire circumference of the positioning protrusion has a gap with the hole wall of the positioning hole, and the size of the gap is h1, and h1 satisfies: 0.5mm≤h1≤1.5mm.

9. The end cap assembly according to claim 8, characterized in that: The h1 satisfies: 0.5mm≤h1≤1mm.

10. The end cap assembly according to any one of claims 1 to 6, characterized in that: The positioning protrusion is configured to protrude from the insulating film.

11. The end cap assembly according to claim 10, characterized in that: The end cap assembly further includes a first pole and a second pole with opposite polarities, the first pole and the second pole are both arranged on the end cap, the positioning protrusion is arranged on at least one side of the two opposite sides of the connection surface along a first direction, the first direction intersects with the second direction, and the second direction is parallel to the arrangement direction from the first pole to the second pole; A dimension of a portion of the positioning protrusion protruding from the insulating film along the first direction is h2, and h2 satisfies: 0.5 mm≤h2≤1.5 mm.

12. The end cap assembly according to claim 11, characterized in that The h2 satisfies: 0.5mm≤h2≤1mm.

13. A battery cell, characterized in that: include: A housing having a receiving cavity and an opening communicating with the receiving cavity; An electrode assembly, located in the accommodating cavity; An insulating film, located in the accommodating cavity and wrapping the electrode assembly; as well as According to the end cover assembly as described in any one of claims 1-12, the end cover is covered at the opening of the shell, the insulating member is located between the end cover and the electrode assembly, the insulating film is provided with a positioning hole, and the positioning protrusion is inserted into the positioning hole and connected to the insulating film.

14. A battery, characterized in that: Comprising a battery cell as claimed in any one of claims 1 to 13.

15. An electrical device, characterized in that: Comprising a battery as claimed in claim 14, the battery is used to provide electrical energy.

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