Battery monomer, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, an end cover, a first electrode lead-out part, an electrode assembly and an insulating part, the shell is provided with an opening, and the end cover is connected to the shell and covers the opening. The first electrode lead-out part is arranged on the end cover. The electrode assembly is arranged in the shell, a first tab is arranged on the side, facing the end cover, of the electrode assembly, and the first tab is electrically connected to the first electrode leading-out part. The insulating part comprises an insulating main body and a protruding part, the insulating main body is arranged between the end cover and the electrode assembly, the protruding part is arranged along the edge of the insulating main body and protrudes out of the first surface, away from the end cover, of the insulating main body, and at least part of the first tab is located on the inner side of the protruding part; the insulating part is provided with a first channel penetrating through the protruding part, and at least part of the first tab is exposed out of the protruding part through the first channel. According to the invention, the shielding of the protruding part on the first tab can be reduced, the effectiveness and reliability of tab detection are improved, and the product yield is further improved.

Description

Technical Field

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

[0002] Batteries are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0003] In order to improve the reliability of battery cells, the tabs need to be inspected after the tabs and adapters are welded. How to improve the convenience and effectiveness of tab inspection is a research direction in battery technology. Utility Model Content

[0004] The embodiments of the present application provide a battery cell, a battery device, and an electrical device, which can improve the effectiveness and reliability of tab detection.

[0005] According to a first aspect of the present application, a battery cell is provided, comprising a housing, an end cap, a first electrode lead-out portion, an electrode assembly, and an insulating member. The housing has an opening, and the end cap is connected to the housing and covers the opening. The first electrode lead-out portion is disposed on the end cap. The electrode assembly is disposed within the housing, and a first tab is disposed on a side of the electrode assembly facing the end cap. The first tab is electrically connected to the first electrode lead-out portion. The insulating member comprises an insulating body and a protrusion. The insulating body is disposed between the end cap and the electrode assembly. The protrusion is disposed along an edge of the insulating body and protrudes from a first surface of the insulating body facing away from the end cap. At least a portion of the first tab is located inside the protrusion. The insulating member comprises a first channel extending through the protrusion, such that at least a portion of the first tab is exposed outside the protrusion through the first channel. The first channel reduces obstruction of the first tab by the protrusion, facilitating observation of the first tab from outside the protrusion. This facilitates a detection device to obtain more comprehensive detection information about the first tab through the first channel, such as obtaining a more comprehensive and clear image of the first tab, thereby improving the effectiveness and reliability of tab detection and, thereby, increasing product quality.

[0006] In some embodiments, the protrusion includes a first protrusion, the first protrusion being disposed along an edge of the insulating body in the width direction of the end cap, the width direction of the end cap being perpendicular to the width direction of the first tab; and a first channel extending through the first protrusion along the width direction of the end cap. The surface of the first tab along its thickness direction can be exposed to the exterior of the protrusion through the first channel. The inspection device can obtain inspection information related to the surface of the first tab through the first channel, such as an image of the surface of the first tab, which facilitates detection of tearing, cracking, and other phenomena in the first tab, thereby improving the comprehensiveness of tab defect detection.

[0007] In some embodiments, the first channel extends continuously along the length of the end cap; along the length of the end cap, the first channel extends beyond the first tab; or, along the length of the end cap, both ends of the first channel are aligned with both ends of the first tab. In the length direction, the first protrusion does not completely obstruct the first tab; the entire first tab is exposed outside the protrusion through the first channel, increasing the exposed area of the first tab and further improving the comprehensiveness and effectiveness of tab defect detection.

[0008] In some embodiments, the length of the first channel along the length direction of the end cover is L1, and the length direction of the end cover is parallel to the width direction of the first pole tab; the first pole tab includes a plurality of first pole tab layers stacked together, and the width of each first pole tab layer along the length direction of the end cover is L2, and L1 and L2 satisfy: L1 ≥ 1.05L2, which fully considers the misalignment of the plurality of first pole tab layers, and is conducive to improving the comprehensiveness and effectiveness of the pole tab detection.

[0009] In some embodiments, the first protrusion includes a first protrusion, the first channel includes a plurality of first connecting portions spaced apart along the length of the end cap, with the first protrusion separating two adjacent first connecting portions, and the length of the end cap being parallel to the width of the first tab. The first protrusion can block structures such as the first tab and / or adapter located inside the first protrusion, thereby reducing the possibility of the first tab and / or adapter overlapping the housing and improving the reliability of the battery cell.

[0010] In some embodiments, along the length of the end cap, the first channel and the first protrusions extend beyond the first tab; alternatively, along the length of the end cap, the ends of the first channel and the first protrusions align with the ends of the first tab. This maximizes the length of the first tab exposed outside the protrusion, increasing the exposed area of the first tab and improving the comprehensiveness and effectiveness of tab defect detection.

[0011] In some embodiments, the length of the first channel and the first protrusions along the length of the end cap is L3. The first tab includes multiple stacked first tab layers, each of which has a width L2 along the length of the end cap. L2 and L3 satisfy the following: L3 ≥ 1.05L2. The length of the first channel and the first protrusions is slightly greater than the width of the first tab layer, fully accounting for misalignment of the multiple first tab layers and facilitating comprehensive and effective tab inspection.

[0012] In some embodiments, the first electrode lead includes a first adapter, which is disposed on a side of the insulating body facing away from the end cap and connected to the first tab. Along the width of the end cap, the projection of the first adapter partially overlaps with the projection of the first protrusion. When the first adapter rotates relative to the insulating member, it abuts against the first protrusion, which blocks and restricts the first adapter, thereby reducing the risk of the first adapter contacting the outer casing.

[0013] In some embodiments, the first adapter does not extend beyond the protrusion along the thickness direction of the end cap, thereby further reducing the risk of overlap between the first adapter and the housing. Furthermore, the space occupied by the first adapter within the housing is reduced, thereby improving space utilization and energy density.

[0014] In some embodiments, the protrusion includes a first end surface facing away from the insulating body, and the first channel is recessed in the first end surface, which is beneficial to increasing the size of the first channel along the thickness direction and simplifying the structure and process.

[0015] In some embodiments, the protrusion includes a first end face, a first side face, and two second surfaces. The first end face faces away from the insulating body, the first side face faces the first channel, and the two second surfaces are arranged opposite each other along the thickness direction of the protrusion. The first end face is smoothly connected to the first side face, and each second surface is smoothly connected to the first side face. The edges of the protrusion adjacent to the first channel are all smooth. When the first tab contacts the edges of the protrusion during bending, stress concentration is not caused, which helps reduce the risk of defects or damage to the first tab due to stress concentration.

[0016] In some embodiments, there are two first channels, which are arranged opposite each other along the width of the end cap; at least a portion of the first tab is exposed outside the protrusion through the two first channels. This allows for simultaneous inspection of the first tab from both sides of the width; alternatively, the two first tabs can be inspected separately from different directions; alternatively, the first tabs of the two electrode assemblies can be inspected separately from different directions, providing a more comprehensive inspection of the first tabs.

[0017] In some embodiments, the electrode assembly has a second tab on the side facing the end cap. The second tab has an opposite polarity to the first tab, and at least a portion of the second tab is located inside the protrusion. The insulating member has a second channel extending through the protrusion, and at least a portion of the second tab is exposed outside the protrusion through the second channel. The second channel can reduce obstruction of the second tab by the protrusion, facilitating observation of the second tab from outside the protrusion. This facilitates the detection device to obtain more comprehensive detection information about the second tab through the second channel, such as obtaining a more comprehensive and clear image of the second tab, thereby improving the effectiveness and reliability of tab detection and thereby increasing product quality.

[0018] According to a second aspect of the present application, an embodiment of the present application further provides a battery device, which includes a plurality of battery cells provided according to any embodiment of the present application.

[0019] According to a third aspect of the present application, an embodiment of the present application further provides an electrical device, which includes a battery device provided according to any embodiment of the present application, and the battery device is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following briefly introduces the drawings required for use in the embodiments of the present application. 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 these drawings without creative work.

[0021] Figure 1 It is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0022] Figure 2 It is a schematic diagram of the exploded structure of the battery device provided in some embodiments of the present application.

[0023] Figure 3 This is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0024] Figure 4 yes Figure 3 Schematic diagram of the unfolded structure of part of the battery cell shown.

[0025] Figure 5 and Figure 6 They are schematic diagrams of the structures of the insulating parts of the battery cells provided in some embodiments of the present application in different orientations.

[0026] Figure 7 yes Figure 3 Schematic diagram of the structure of the electrode assembly of the battery cell shown.

[0027] Figure 8 and Figure 9 They are schematic structural diagrams of the insulating parts of the battery cells provided in other embodiments of the present application in different orientations.

[0028] Figure 10 yes Figure 8 Schematic diagram of the enlarged structure of area A in the middle.

[0029] In the attached figure:

[0030] Vehicle 1, battery device 2, controller 3, motor 4, box 5, battery cell 6;

[0031] Shell 10, end cover 11, shell 12, opening 121, electrode assembly 20, first electrode tab 21, first electrode tab layer 211, second electrode tab 22, electrode body 23, insulating member 30, insulating body 31, first surface 311, protrusion 32, first protrusion 321, first protrusion 3211, second protrusion 3212, second protrusion 322, first end surface 32a, first side surface 32b, second surface 32c, first channel 33, protrusion 33, first connecting portion 331, second channel 34, second connecting portion 341, first electrode lead-out portion 40, first electrode terminal 41, first adapter 42, second electrode lead-out portion 50, second electrode terminal 51, second adapter 52, first box portion 5a, second box portion 5b, width direction X, length direction Y, thickness direction Z. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0033] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" 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-secondary relationship.

[0034] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0035] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0036] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0037] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0038] The term "plurality" used in this application refers to two or more (including two).

[0039] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0040] In the embodiment of the present application, the battery cell may be a secondary battery cell. A secondary battery cell refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0041] The battery cell can be a lithium-ion battery cell, a sodium-ion battery cell, a sodium-lithium-ion battery cell, a lithium metal battery cell, a sodium metal battery cell, a lithium-sulfur battery cell, a magnesium-ion battery cell, a nickel-hydrogen battery cell, a nickel-cadmium battery cell, a lead-acid battery cell, etc., and the embodiments of the present application are not limited to this.

[0042] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell or a battery cell of other shapes. The prismatic battery cell includes a square shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc. There is no special limitation in this application.

[0043] The battery device mentioned in the embodiments of the present application includes one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel or hybrid via a busbar.

[0044] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells. For example, the battery cell assembly may be a battery module, which is formed by arranging and securing multiple battery cells to form a single module. For example, a battery module may be formed by bundling multiple battery cells using cable ties.

[0045] As an example, the battery cell assembly may be a battery module, which may be housed in a housing by securing the battery module in the housing. As an example, the housing may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are respectively connected to the frame to form an enclosed space within the housing to accommodate the battery cell assembly.

[0046] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0047] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0048] In some embodiments, the battery device may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0049] A battery cell typically consists of an electrode assembly and a casing that houses the electrode assembly. The casing is provided with electrode leads, and the electrode assembly includes tabs, which are typically connected to the electrode leads on the casing via adapters. During the welding process between the tabs and the adapters, the tabs will bend to varying degrees. This bending can cause tearing, cracking, or other defects, potentially leading to overcurrent and compromising the reliability of the battery cell. Therefore, it is necessary to inspect the bent tabs.

[0050] In related technologies, an inspection device can capture images of the tabs and automatically detect tab defects based on the captured images. The clarity of the images captured by the inspection device and the extent of the tab area covered by the images directly determine the accuracy and effectiveness of the inspection results.

[0051] The adapter is usually provided on the side of the end cap assembly of the battery cell facing the electrode assembly. The end cap assembly includes an end cap and an insulating member provided on the side of the end cap facing the electrode assembly. The edge of the insulating member is usually provided with a circle of protrusions to block the tabs and / or the adapter, and limit the overlap of the tabs and / or the adapter with the shell. However, in the process of the detection device acquiring the tab image, the protrusion may block part of the tab, resulting in the detection device being unable to acquire the entire image of the tab or affecting the clarity of the acquired image, thereby affecting the effectiveness and reliability of the tab detection.

[0052] In view of this, an embodiment of the present application provides a technical solution, which provides a first channel passing through the protrusion on the insulating part, so that at least part of the first pole ear is exposed to the outside of the protrusion through the first channel, thereby reducing the obstruction of the first pole ear by the protrusion, facilitating the observation of the first pole ear from the outside of the protrusion, and facilitating the detection of the first pole ear by the detection device through the first channel. It is beneficial for the detection device to obtain more comprehensive detection information of the first pole ear, such as obtaining a more comprehensive and clear image of the first pole ear, thereby improving the effectiveness and reliability of the pole ear detection, and thus improving the product quality rate.

[0053] The technical solutions provided in the embodiments of this application are applicable to battery cells, battery devices, and electrical devices using battery devices. Electrical devices may include vehicles, mobile phones, portable devices, laptop computers, ships, spacecraft, electric toys, and power tools. Vehicles may include fuel-powered vehicles, gas-powered vehicles, or new energy vehicles. New energy vehicles may include pure electric vehicles, hybrid vehicles, or extended-range vehicles. Spacecraft include aircraft, rockets, space shuttles, and spacecraft. The embodiments of this application do not impose any specific restrictions on these electrical devices.

[0054] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device.

[0055] Figure 1 Schematic diagram of the structure of the vehicle provided by some embodiments of the present application. Figure 1 Vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. A battery device 2 is provided inside vehicle 1. Battery device 2 can be located at the bottom, head, or tail of vehicle 1. Battery device 2 can be used to power vehicle 1. For example, battery device 2 can serve as an operating power source for vehicle 1. Vehicle 1 can also include a controller 3 and a motor 4. Controller 3 is used to control battery device 2 to power motor 4, for example, to meet the power requirements of vehicle 1 during startup, navigation, and driving.

[0056] In some embodiments of the present application, the battery device 2 can serve not only as an operating power source for the vehicle 1 , but also 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 .

[0057] Figure 2 Schematic diagram of the exploded structure of the battery device provided in some embodiments of the present application. Figure 2 The battery device 2 includes a housing 5 and a battery cell 6, and the battery cell 6 is accommodated in the housing 5. The housing 5 is used to provide a storage space for the battery cell 6, and the housing 5 can adopt a variety of structures. In some embodiments, the housing 5 can include a first housing portion 5a and a second housing portion 5b, and the first housing portion 5a and the second housing portion 5b cover each other, and the first housing portion 5a and the second housing portion 5b jointly define a storage space for accommodating the battery cell 6. The second housing portion 5b can be a hollow structure with one end open, and the first housing portion 5a can be a plate-shaped structure, and the first housing portion 5a covers the open side of the second housing portion 5b, so that the first housing portion 5a and the second housing portion 5b jointly define a storage space; the first housing portion 5a and the second housing portion 5b can also be hollow structures with one side open, and the open side of the first housing portion 5a covers the open side of the second housing portion 5b. Of course, the box body 5 formed by the first box body portion 5a and the second box body portion 5b can be in various shapes, such as a cylinder, a rectangular parallelepiped, etc.

[0058] The battery cell 6 may be the smallest unit constituting the battery device.

[0059] In the battery device 2, there may be multiple battery cells 6, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 6. The multiple battery cells 6 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire assembly of the multiple battery cells 6 is housed within the housing 5. Alternatively, the battery device 2 may comprise a battery cell assembly comprising multiple battery cells 6 connected in series, in parallel, or in a hybrid connection, and then the battery cell assembly is further connected in series, in parallel, or in a hybrid connection to form a single assembly, which is then housed within the housing 5. The battery device 2 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 6.

[0060] Each battery cell 6 can be a secondary battery or a primary battery, and can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 6 can be cylindrical, flat, rectangular, or in other shapes.

[0061] Figure 3 is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application, Figure 4 yes Figure 3 The schematic diagram of the battery cell after partial structure expansion is shown. Figure 3 and Figure 4The battery cell 6 provided in the embodiment of the present application includes a housing 10 and an electrode assembly 20, and the electrode assembly 20 is accommodated in the housing 10. The number of the electrode assembly 20 can be one or more.

[0062] The housing 10 is a hollow structure, and a space is formed inside the housing 10 for accommodating the electrode assembly 20 and the electrolyte. The shape of the housing 10 can be cylindrical, prismatic, rectangular or other shapes.

[0063] Optionally, the housing 10 may include a shell 12 and an end cover 11 , which may be separate components. The shell 12 has an opening, and the end cover 11 covers the opening of the shell 12 .

[0064] The housing 12 may be open at one end or at both ends. For example, the housing 12 is open at one end, and one end cap 11 is provided to cover the opening of the housing 12. As another example, the housing 12 may be open at both ends, and two end caps 11 are provided, each of which covers the two openings of the housing 12.

[0065] The shell 12 may include a plurality of integrally formed shell walls, and the end cover 11 and the plurality of shell walls of the shell 12 together enclose an inner space of the outer shell 10 .

[0066] The housing 12 can be made of a variety of materials, such as copper, iron, aluminum, and aluminum alloys. The material of the end cap 11 can be the same as or different from that of the housing 12. Optionally, the end cap 11 can be made of a material with a certain hardness and strength (such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.). In this way, the end cap 11 is less likely to deform when squeezed or collided, thereby providing the battery cell 6 with higher structural strength and improved reliability.

[0067] The electrode assembly 20 is a component in the battery cell 6 where electrochemical reactions occur.

[0068] The electrode assembly 20 may include a first tab 21, a second tab 22, and an electrode body 23. One of the first tab 21 and the second tab 22 is an anode tab, and the other is a cathode tab. The first tab 21 and the second tab 22 may extend from opposite ends of the electrode body 23 and be connected to two electrode lead-out portions of the battery cell 6.

[0069] The electrode assembly 20 may include a first electrode piece, a second electrode piece, and a separator. The separator is disposed between the first and second electrode pieces. The first and second electrode pieces have opposite polarities. The first electrode piece may include a first current collector, a first film layer, and a first electrode tab 21. The first film layer is disposed on at least one surface of the first current collector. The first electrode tab 21 is connected to the first current collector. The second electrode piece may include a second current collector, a second film layer, and a second electrode tab 22. The second film layer is disposed on at least one surface of the second current collector. The second electrode tab 22 is connected to the second current collector.

[0070] The first electrode sheet, the second electrode sheet, and the separator are wound together. The electrode assembly 20 is a wound structure. After the first electrode sheet, the second electrode sheet, and the separator are wound together, the separator, the first film layer, the first current collector, the second film layer, and the second current collector form the electrode body 23.

[0071] In some embodiments, the battery cell 6 includes a first electrode lead portion 40 and a second electrode lead portion 50, which are insulated from each other. The first electrode lead portion 40 is electrically connected to the first electrode tab 21, and the second electrode lead portion 50 is electrically connected to the second electrode tab 22. The first electrode lead portion 40 and the second electrode lead portion 50 are used to connect to an external circuit to enable charging or discharging of the battery cell 6. For example, when multiple battery cells 6 are assembled into a group, the first electrode lead portion 40 and the second electrode lead portion 50 are used to connect to a busbar.

[0072] The first electrode lead-out portion 40 may be provided on the outer shell 10. Optionally, the first electrode lead-out portion 40 may include a first electrode terminal 41 provided on the outer shell 10. The first electrode terminal 41 and the outer shell 10 are formed separately and assembled together during the production process of the battery cell 6. Furthermore, the first electrode lead-out portion 40 may also include a first adapter 42. The first adapter 42 is provided on the inner side of the outer shell 10 facing the electrode assembly 20 and is connected to the first electrode tab 21 by welding or other means. The first adapter 42 is electrically connected to the first electrode terminal 41.

[0073] The second electrode lead-out portion 50 may be provided on the outer shell 10. Optionally, the first electrode lead-out portion 50 may include a second electrode terminal 51 provided on the outer shell 10. The second electrode terminal 51 and the outer shell 10 are formed separately and assembled together during the production process of the battery cell 6. Furthermore, the second electrode lead-out portion 50 may also include a second adapter 52. The second adapter 52 is provided on the inner side of the outer shell 10 facing the electrode assembly 20 and is connected to the second electrode tab 22 by welding or other means. The second adapter 52 is electrically connected to the second electrode terminal 51.

[0074] Alternatively, the second electrode lead-out portion 50 may also be a part of the outer shell 10 .

[0075] Figure 5 and Figure 6These are schematic diagrams of the structure of the insulating member of the battery cell provided by some embodiments of the present application in different orientations. Figure 4 、 Figure 5 and Figure 6 The battery cell 6 provided in the embodiment of the present application includes a shell 12, an end cover 11, a first electrode lead-out portion 40, an electrode assembly 20 and an insulating member 30. The shell 12 has an opening 121, and the end cover 11 is connected to the shell 12 and covers the opening 121. The first electrode lead-out portion 40 is provided on the end cover 11. The electrode assembly 20 is provided in the shell 12, and the side of the electrode assembly 20 facing the end cover 11 has a first electrode tab 21, and the first electrode tab 21 is electrically connected to the first electrode lead-out portion 40. The insulating member 30 includes an insulating body 31 and a protrusion 32. The insulating body 31 is provided between the end cover 11 and the electrode assembly 20. The protrusion 32 is provided along the edge of the insulating body 31 and protrudes from the first surface 311 of the insulating body 31 facing away from the end cover 11. At least a portion of the first electrode tab 21 is located on the inner side of the protrusion 32. The insulating member 30 defines a first channel 33 penetrating the protruding portion 32 . At least a portion of the first electrode tab 21 is exposed outside the protruding portion 32 through the first channel 33 .

[0076] The end cover 11 may be connected to the housing 12 by welding or other suitable means.

[0077] A portion of the first electrode lead-out portion 40 may be disposed on the outer side of the end cover 11 facing away from the electrode assembly 20 so as to be connected to an external circuit; a portion of the first electrode lead-out portion 40 may be disposed on the inner side of the end cover 11 facing the electrode assembly 20 so as to be electrically connected to the first electrode tab 21; a portion of the first electrode lead-out portion 40 may pass through the end cover 11 along the thickness direction of the end cover 11.

[0078] The first electrode tab 21 and the first electrode lead portion 40 may be electrically connected by welding.

[0079] The insulating member 30 can insulate and isolate the end cap 11 from the electrode assembly 20 to reduce the risk of the end cap 11 conducting current between the positive and negative electrodes of the electrode assembly 20 .

[0080] The insulating body 31 and the protrusion 32 may be an integrally formed structure.

[0081] The height of the protrusion 32 protruding from the first surface 311 at any position can be the same, or only part of the protrusion 32 can protrude from the first surface 311 at the same height. Different sections of the protrusion 32 can protrude from the first surface 311 at different heights.

[0082] The insulating body 31 may be a plate-shaped structure, and the protrusion 32 may be a convex edge provided along the edge of the insulating body 31 .

[0083] The protrusion 32 and the insulating body 31 enclose an open space, which is open at least toward the electrode assembly 20. The inner side of the protrusion 32 refers to the side of the protrusion 32 facing the space, and the outer side of the protrusion 32 refers to the side of the protrusion 32 facing away from the space.

[0084] The first electrode tab 21 may be entirely located inside the protrusion 32, or only a portion of the first electrode tab 21 may be located inside the protrusion 32, and another portion of the first electrode tab 21 may extend beyond the protrusion 32 along the protruding direction of the protrusion 32. It is understood that the protruding direction of the protrusion 32 is the thickness direction of the end cap 11.

[0085] The first passage 33 may penetrate the protruding portion 32 along a thickness direction of the protruding portion 32 to penetrate the inner side and the outer side of the protruding portion 32. The thickness direction of the protruding portion 32 is perpendicular to the protruding direction of the protruding portion 32.

[0086] The first channel 33 may be in the form of a groove, a through hole or other suitable structures.

[0087] The first channel 33 may be provided on the protruding portion 32 , or may be formed by enclosing the protruding portion 32 and the insulating body 31 .

[0088] In one example, the first electrode tab 21 may be entirely exposed outside the protrusion 32 through the first channel 33 , and the entire first electrode tab 21 may be observed from the outside of the protrusion 32 .

[0089] In another example, a portion of the first tab 21 is exposed outside the protrusion 32 through the first channel 33, while the protrusion 32 blocks another portion of the first tab 21. For example, a portion of the first tab 21 that is prone to defects is exposed outside the protrusion 32, while a portion of the first tab 21 that is less prone to defects is blocked by the protrusion 32. This facilitates defect detection of the first tab 21, reduces the size of the first channel 33, increases the size of the protrusion 32, and improves the blocking effect of the protrusion 32 on the first tab 21 and / or the first adapter 42.

[0090] In the embodiment of the present application, by providing a first channel 33 passing through the protrusion 32 on the insulating member 30, at least a portion of the first pole lug 21 can be exposed to the outside of the protrusion 32 through the first channel 33, thereby reducing the obstruction of the first pole lug 21 by the protrusion 32, making it easier to observe the first pole lug 21 from the outside of the protrusion 32, and facilitating the detection device to obtain more comprehensive detection information of the first pole lug 21 through the first channel 33, such as obtaining a more comprehensive and clear image of the first pole lug 21, thereby improving the effectiveness and reliability of the pole lug detection and thereby improving the product quality rate.

[0091] In some embodiments, the protrusion 32 includes a first protrusion 321, which is disposed along an edge of the insulating body 31 in the width direction X of the end cap 11. The width direction X of the end cap 11 is perpendicular to the width direction of the first tab 21. The first channel 33 passes through the first protrusion 321 along the width direction X of the end cap 11.

[0092] The first protrusion 321 is provided on at least one side edge of the insulating body 31 along the width direction X. Optionally, the first protrusion 321 is provided on both side edges of the insulating body 31 along the width direction X to improve its protective effect.

[0093] The edge of the insulating body 31 in the width direction X extends along the length direction Y of the end cap 11. Therefore, the first protrusion 321 can extend along the length direction Y of the end cap 11 and have a certain length. Correspondingly, the first channel 33 passes through the first protrusion 321 and can extend along the length direction Y of the end cap 11 and have a certain length, so as to expose more area of the first tab 21 outside the protrusion 32.

[0094] The inventors have recognized that after the first electrode tab 21 is connected to the first electrode lead portion 40 , defects such as tearing and cracking are likely to occur on the surface of the first electrode tab 21 along its thickness direction. Such defects are difficult to detect along the width direction of the first electrode tab 21 .

[0095] It can be understood that the width direction of the first electrode tab 21 refers to a direction perpendicular to both the thickness direction of the first electrode tab 21 and the direction in which the first electrode tab 21 extends out of the electrode body 23 .

[0096] The width direction of the first pole tab 21 is perpendicular to the width direction X of the end cap 11, and the width direction of the first pole tab 21 can be parallel to the length direction Y of the end cap 11. In this way, the surface of the first pole tab 21 along its thickness direction can be exposed to the outside of the protrusion 32 through the first channel 33. The detection device can obtain detection information related to the surface of the first pole tab 21 through the first channel 33, such as obtaining a surface image of the first pole tab 21, which is conducive to detecting whether the first pole tab 21 has tears or cracks, thereby improving the comprehensiveness of pole tab defect detection.

[0097] In some embodiments, the first channel 33 extends continuously along the length direction Y of the end cap 11. Along the length direction of the end cap 11, the first channel 33 extends beyond the first electrode tab 21; alternatively, along the length direction of the end cap 11, both ends of the first channel 33 are aligned with both ends of the first electrode tab 21 along the length direction Y of the end cap 11.

[0098] The first channel 33 extends continuously, which means that the first channel 33 has a continuous space and the first channel 33 is not blocked by any physical structure such as a block or a baffle.

[0099] In one example, both ends of the first channel 33 along the length direction Y extend beyond both ends of the first tab 21 along the length direction Y. The length of the first channel 33 along the length direction Y may be greater than the width of the first tab 21 along the length direction Y. Both ends of the first tab 21 along the length direction Y are exposed outside the protrusion 32 through the first channel 33 .

[0100] In another example, the length of the first channel 33 along the length direction Y may be equal to the width of the first tab 21 along the length direction Y. Both ends of the first tab 21 along the length direction Y may be exposed outside the protrusion 32 through the first channel 33 .

[0101] In the embodiment of the present application, the first channel 33 is configured to extend continuously along the length direction Y, with both ends of the first channel 33 extending beyond the first pole tab 21 or aligned with both ends of the first pole tab 21. In the length direction Y, the first protrusion 321 does not completely block the first pole tab 21. The first pole tab 21 is exposed as a whole outside the protrusion 32 through the first channel 33, thereby increasing the exposed area of the first pole tab 21 and facilitating further improving the comprehensiveness and effectiveness of pole tab defect detection.

[0102] Figure 7 yes Figure 3 In some embodiments, referring to Figure 6 and Figure 7 The length of the first channel 33 along the length direction Y of the end cap 11 is L1. The length direction Y of the end cap 11 is parallel to the width direction of the first electrode tab 21. The first electrode tab 21 includes a plurality of stacked first electrode tab layers 211. The width of each first electrode tab layer 211 along the length direction of the end cap 11 is L2. L1 and L2 satisfy the following: L1 ≥ 1.05L2.

[0103] The first pole sheet may include a first current collector, a first film layer, and multiple first pole tab layers 211, each of which is connected to the first current collector. The second pole sheet may include a second current collector, a second film layer, and multiple second pole tab layers, each of which is connected to the second current collector. After the first and second pole sheets and separators are wound together, the multiple first pole tab layers 211 are stacked to form the first pole tab 21, and the multiple second pole tab layers are stacked to form the second pole tab 22.

[0104] During the winding process, it is not guaranteed that the multiple first tab layers 211 are completely aligned, and some of the first tab layers 211 may be staggered by a certain distance along the length direction Y of the end cap 11. When the multiple first tab layers 211 are completely aligned, the width of the first tab 21 along the length direction Y is the width of the first tab layer 211. When at least some of the first tab layers 211 are staggered along the length direction Y of the end cap 11, the width of the first tab 21 is greater than the width of the first tab layer 211.

[0105] For example, the staggered dimension of the plurality of first tab layers 211 along the length direction Y of the end cap 11 can be L4, and L1, L2, and L4 can satisfy the following: L1 ≥ L2 + 2L4. Thus, regardless of the staggered dimension of the first tab layers 211 along the length direction Y, any position of the first tab 21 along the length direction Y can be exposed to the first channel 33.

[0106] It should be noted that the width of the first electrode tab 21 in the embodiment of the present application refers to the maximum width of the portion of the first electrode tab 21 extending from the electrode body 23 along the length direction Y. Correspondingly, the width of the first electrode tab layer 211 refers to the maximum width of the portion of the first electrode tab layer 211 extending from the electrode body 23 along the length direction Y.

[0107] In the embodiment of the present application, L1 and L2 are set to L1≥1.05L2, and the length of the first channel 33 is slightly larger than the width of the first tab layer 211, which fully considers the misalignment of multiple first tab layers 211 and is conducive to improving the comprehensiveness and effectiveness of tab detection.

[0108] In some embodiments, the length L1 of the first channel 33 may be less than one-third of the total length of the end cap 11 to increase the length of the first protrusion 321 along the length direction Y and improve the effect of the first protrusion 321 in limiting the overlap between the tab and / or adapter and the housing 10.

[0109] Figure 8 and Figure 9 They are schematic diagrams of the structure of the insulating member of the battery cell in different orientations provided by other embodiments of the present application. Figure 8 and Figure 9 The first protrusion 321 includes a first protrusion 3211, and the first channel 33 includes a plurality of first connecting portions 331 spaced apart along the length direction Y of the end cover 11, and two adjacent first connecting portions 331 are separated by the first protrusion 3211, and the length direction Y of the end cover 11 is parallel to the width direction of the first electrode tab 21.

[0110] In one example, the number of the first protrusion 3211 may be one, and the first channel 33 includes two first communicating portions 331 separated by the first protrusion 3211 .

[0111] In another example, the number of the first protrusions 3211 may be multiple, and the multiple first protrusions 3211 are arranged at intervals along the length direction Y.

[0112] The first protrusion 3211 can be columnar or sheet-shaped. The size of the first protrusion 3211 along the length direction Y can be as small as possible to reduce the space it occupies and increase the space of the first channel 33.

[0113] The first protrusion 3211 can block the first tab 21 and / or the adapter and other structures inside the first protrusion 321 to reduce the possibility of the first tab 21 and / or the adapter overlapping with the shell 10, thereby improving the reliability of the battery cell 6.

[0114] In some embodiments, along the length direction Y of the end cover 11, the whole formed by the first channel 33 and each first protrusion 3211 exceeds the first electrode tab 21; or, along the length direction Y of the end cover 11, the two ends of the whole formed by the first channel 33 and each first protrusion 3211 are aligned with the two ends of the first electrode tab 21.

[0115] In one example, both ends of the entirety formed by the first channel 33 and each first protrusion 3211 along the length direction Y extend beyond both ends of the first tab 21 along the length direction Y. The length of the entirety formed by the first channel 33 and each first protrusion 3211 along the length direction Y may be greater than the width of the first tab 21 along the length direction Y. The portion of the first tab 21 not blocked by the first protrusion 3211 may be exposed outside the protruding portion 32 through the first channel 33 .

[0116] In another example, the length of the entire structure formed by the first channel 33 and each first protrusion 3211 along the length direction Y may be equal to the width of the first tab 21 along the length direction Y. Both ends of the first tab 21 along the length direction Y may be exposed outside the protrusion 32 through the first channel 33 .

[0117] It can be understood that the length of the whole formed by the first channel 33 and each first protrusion 3211 along the length direction Y is the sum of the length of each first connecting portion 331 of the first channel 33 and the length of each first protrusion 3211 .

[0118] In the embodiment of the present application, the two ends of the whole formed by the first channel 33 and each first protrusion 3211 extend beyond the first pole lug 21 or are aligned with the two ends of the first pole lug 21, thereby increasing the length of the portion of the first pole lug 21 exposed outside the protrusion 32 as much as possible, increasing the exposed area of the first pole lug 21, and facilitating the comprehensiveness and effectiveness of pole lug defect detection.

[0119] In some embodiments, reference Figure 7 and Figure 9 The length of the whole formed by the first channel 33 and each first protrusion 3211 along the length direction Y of the end cover 11 is L3, the first pole tab 21 includes a plurality of first pole tab layers 211 stacked together, and the width of each first pole tab layer 211 along the length direction Y of the end cover 11 is L2, and L2 and L3 satisfy: L3 ≥ 1.05L2.

[0120] For example, the staggered dimension of the plurality of first tab layers 211 along the length direction Y of the end cap 11 can be L4, and L2, L3, and L4 can satisfy the following: L3 ≥ L2 + 2L4. Thus, regardless of the staggered dimension of the first tab layers 211 along the length direction Y, any position of the first tab 21 along the length direction Y can be exposed to the first channel 33.

[0121] In the embodiment of the present application, L3 and L2 are set to L3≥1.05L2. The overall length formed by the first channel 33 and each first protrusion 3211 is slightly larger than the width of the first tab layer 211, which fully considers the misalignment of multiple first tab layers 211 and is conducive to improving the comprehensiveness and effectiveness of tab detection.

[0122] In some embodiments, the overall length L3 formed by the first channel 33 and each first protrusion 3211 may be less than one-third of the total length of the end cover 11, so as to increase the length of the first protrusion 321 along the length direction Y, thereby improving the effect of the first protrusion 321 in limiting the overlap of the tab and / or adapter with the housing 10.

[0123] In some embodiments, reference Figure 3 and Figure 4 The first electrode lead-out portion 40 includes a first adapter 42, which is disposed on a side of the insulating body 31 facing away from the end cap 11 and connected to the first electrode tab 21. Along the width direction X of the end cap 11, the projection of the first adapter 42 partially overlaps with the projection of the first protrusion 3211.

[0124] The first adapter 42 can be electrically connected to the first electrode terminal 41 by welding or other means. The first adapter 42 can be electrically connected to the first electrode tab 21 by welding or other means. The first electrode terminal 41 is electrically connected to the first electrode tab 21 through the first adapter 42.

[0125] Along the width direction X of the end cover 11 , the projection of the first adapter 42 partially overlaps with the projection of the first convex portion 321 except the first protrusion 3211 , and the projection of the first adapter 42 partially overlaps with the projection of the first channel 33 .

[0126] Optionally, one end of the first adapter 42 along the length direction Y may extend beyond the first protrusion 3211. After the first adapter 42 rotates relative to the insulating member 30, the first adapter 42 can abut against the first protrusion 3211, while also shortening the size of the first protrusion 3211 along the length direction Y.

[0127] During assembly of the first adapter 42, the first adapter 42 may rotate relative to the insulating member 30, resulting in overlapping contact with the end cap 11 or the housing 12. Along the width direction X of the end cap 11, the projection of the first adapter 42 partially overlaps with the projection of the first protrusion 3211. When the first adapter 42 rotates relative to the insulating member 30, it may abut against the first protrusion 3211. The first protrusion 3211 blocks and restricts the first adapter 42, thereby reducing the risk of the first adapter 42 overlapping the housing 10.

[0128] In some embodiments, along the thickness direction Z of the end cover 11 , the first transition member 42 does not extend beyond the protruding portion 32 .

[0129] The first adapter 42 has a second surface facing the electrode assembly 20, and the protrusion 32 has a first end surface 32a facing away from the insulating body 31. The second surface may be closer to the insulating body 31 than the first end surface 32a, or the second surface may be flush with the first end surface 32a.

[0130] The first adapter 42 does not extend beyond the protrusion 32, which further reduces the risk of overlap between the first adapter 42 and the housing 10. Furthermore, the space occupied by the first adapter 42 within the housing 10 is reduced, which improves space utilization and energy density.

[0131] Figure 10 yes Figure 8 Schematic diagram of the enlarged structure of the middle region A. In some embodiments, the protrusion 32 includes a first end surface 32a facing away from the insulating body 31, and the first channel 33 is recessed in the first end surface 32a.

[0132] Optionally, the first channel 33 may be in the form of a groove, a notch, a window, or the like.

[0133] In an example, the depth of the first channel 33 recessed in the first end surface 32 a may be smaller than the height of the protrusion 32 along the thickness direction Z. In this case, the first channel 33 is formed on the protrusion 32 .

[0134] In another example, the depth of the first channel 33 recessed in the first end surface 32 a may be equal to the height of the protrusion 32 along the thickness direction Z. In this case, the first channel 33 is formed by the protrusion 32 and the insulating body 31 .

[0135] Alternatively, the depth of the first channel 33 recessed in the first end surface 32a may also be slightly greater than the height of the protrusion 32 along the thickness direction Z. In this case, a portion of the first channel 33 is formed by the protrusion 32 and the insulating body 31, and the other portion is recessed in the surface of the insulating body 31 facing the electrode assembly 20.

[0136] In the embodiment of the present application, the first channel 33 is configured to be recessed in the first end surface 32 a of the protruding portion 32 , which is beneficial for increasing the size of the first channel 33 along the thickness direction Z and simplifying the structure and process.

[0137] In some embodiments, reference Figure 10 The protrusion 32 includes a first end surface 32a, a first side surface 32b, and two second surfaces 32c. The first end surface 32a faces away from the insulating body 31, the first side surface 32b faces the first channel 33, and the two second surfaces 32c are arranged opposite each other along the thickness direction of the protrusion 32. The first end surface 32a is smoothly connected to the first side surface 32b, and each second surface 32c is smoothly connected to the first side surface 32b.

[0138] The thickness direction of the protrusion 32 is perpendicular to the protruding direction of the protrusion 32 relative to the insulating body 31 .

[0139] Optionally, the first end surface 32a and the first side surface 32b may be smoothly connected via an arcuate surface, and the second surface 32c and the first side surface 32b may be smoothly connected via an arcuate surface.

[0140] In the embodiment of the present application, the first end face 32a is smoothly connected to the first side face 32b, and each second surface 32c is smoothly connected to the first side face 32b. The edges adjacent to the protrusion 32 and the first channel 33 are all smooth structures. When the first pole tab 21 contacts the edge of the protrusion 32 during the bending process, stress concentration will not be caused, which is beneficial to reducing the risk of defects or damage to the first pole tab 21 due to stress concentration.

[0141] In some embodiments, there are two first channels 33 , which are disposed opposite each other along the width direction X of the end cap 11 . At least a portion of the first tab 21 is exposed outside the protrusion 32 through the two first channels 33 .

[0142] The sizes of the two first channels 33 may be the same or different.

[0143] In one example, there is one electrode assembly 20, which includes a first electrode tab 21. The first electrode tab 21 is at least partially exposed outside the protrusion 32 through two first channels 33 on both sides of the width direction X. Thus, the first electrode tab 21 can be inspected simultaneously from both sides of the width direction X, providing a more comprehensive inspection of the first electrode tab 21.

[0144] In another example, there is one electrode assembly 20, which includes two first electrode tabs 21. The two first electrode tabs 21 are arranged opposite each other along the width direction X. At least portions of the two first electrode tabs 21 are exposed outside the protrusion 32 through the two first channels 33. Thus, the two first electrode tabs 21 can be inspected from different directions, and the inspection of each first electrode tab 21 is more comprehensive.

[0145] In yet another example, referring to Figure 3 There are two electrode assemblies 20, and the two electrode assemblies 20 are arranged along the width direction X of the end cap 11. Each electrode assembly 20 includes a first electrode tab 21. The first electrode tabs 21 of the two electrode assemblies 20 are arranged along the width direction X. At least a portion of the first electrode tabs 21 of the two electrode assemblies 20 is exposed to the outside of the protrusion 32 through the two first channels 33. As a result, the first electrode tabs 21 of the two electrode assemblies 20 can be inspected from different directions.

[0146] It is understandable that when there are two electrode assemblies 20 , the first tabs 21 of the two electrode assemblies 20 can be connected to the same first adapter 42 .

[0147] In some embodiments, the electrode assembly 20 has a second electrode tab 22 on the side facing the end cap 11. The second electrode tab 22 has an opposite polarity to the first electrode tab 21, and at least a portion of the second electrode tab 22 is located inside the protrusion 32. The insulating member 30 has a second passage 34 extending through the protrusion 32, and at least a portion of the second electrode tab 22 is exposed outside the protrusion 32 through the second passage 34.

[0148] The first electrode tab 21 and the second electrode tab 22 may be spaced apart along the length direction Y. Accordingly, the first channel 33 and the second channel 34 may be spaced apart along the length direction Y.

[0149] Optionally, the second channel 34 may penetrate the first protrusion 321 along the width direction X of the end cover 11 .

[0150] Optionally, the first convex portion 321 includes a second protrusion 3212 , and the second channel 34 includes a plurality of second connecting portions 341 spaced apart along the length direction Y of the end cover 11 , with two adjacent second connecting portions 341 being separated by the second protrusion 3212 .

[0151] Optionally, there may be two second channels 34, which are arranged opposite to each other along the width direction X, and at least a portion of the second electrode tab 22 is exposed to the outside of the protrusion 32 through the two second channels 34. Furthermore, there may also be two second electrode tabs 22, which are arranged opposite to each other along the width direction X, and at least a portion of the second electrode tabs 22 is exposed to the outside of the protrusion 33 through the two second channels 34, respectively.

[0152] The structure of the second channel 34 may be the same as that of the first channel 33 , and will not be described in detail here.

[0153] The dimensional relationship between the second channel 34 and the second electrode tab 22 may be similar to the dimensional relationship between the first channel 33 and the first electrode tab 21 , and will not be further described here.

[0154] The second channel 34 can reduce the obstruction of the second pole lug 22 by the protrusion 32, making it easier to observe the second pole lug 22 from the outside of the protrusion 32, which is beneficial for the detection device to obtain more comprehensive detection information of the second pole lug 22 through the second channel 34, such as obtaining a more comprehensive and clear image of the second pole lug 22, thereby improving the effectiveness and reliability of the pole lug detection and thus improving the product quality rate.

[0155] In some embodiments, the protruding portion 32 further includes a second protrusion 322 . The second protrusion 322 is disposed on at least one edge of the insulating body 31 along the length direction Y of the end cover 11 .

[0156] The height of the second protrusion 322 protruding from the insulating body 31 may be the same as or different from the height of the first protrusion 321 protruding from the insulating body 31. Optionally, the height of the second protrusion 322 protruding from the insulating body 31 may be greater than the height of the first protrusion 321 protruding from the insulating body 31.

[0157] In the length direction Y of the end cover 11, the second protrusion 322 can be located on the outside of the electrode assembly 20. The second protrusion 322 can have a restrictive effect on the electrode assembly 20 to reduce the shaking of the electrode assembly 20 relative to the shell 10 and improve the stability of the electrode assembly 20.

[0158] According to the second aspect of the present application, an embodiment of the present application further provides a battery device 2, which includes a plurality of battery cells 6 provided by any embodiment of the present application.

[0159] According to the third aspect of the present application, an embodiment of the present application further provides an electrical device, which includes the battery device 2 provided in any embodiment of the present application, and the battery device 2 is used to provide electrical energy.

[0160] The present embodiment provides a battery cell 6, which includes a housing 12, an end cap 11, a first adapter 42, a second adapter 52, an electrode assembly 20, and an insulating member 30. The electrode assembly 20 is disposed within the housing 12, which has an opening 121. The end cap 11 is connected to the housing 12 and covers the opening 121. The first adapter 42 and the second adapter 52 are disposed on the side of the insulating member 30 facing the electrode assembly 20. The side of the electrode assembly 20 facing the end cap 11 has a first electrode tab 21 and a second electrode tab 22. The first electrode tab 21 is electrically connected to the first adapter 42, and the second electrode tab 22 is electrically connected to the second adapter 52. The insulating member 30 includes an insulating body 31 and a first protrusion 321. The insulating body 31 is disposed between the end cap 11 and the electrode assembly 20. The first protrusion 321 is disposed on at least one edge of the insulating body 31 along the width direction X of the end cap 11 and protrudes from a first surface 311 of the insulating body 31 facing away from the end cap 11. At least a portion of the first electrode tab 21 and at least a portion of the second electrode tab 22 are located inside the first protrusion 321. The insulating member 30 is provided with a first channel 33 and a second channel 34 extending through the first protrusion 321 along the width direction X. At least a portion of the first electrode tab 21 is exposed to the exterior of the first protrusion 321 through the first channel 33, and at least a portion of the second electrode tab 22 is exposed to the exterior of the first protrusion 321 through the second channel 34.

[0161] The first channel 33 includes two first communication portions 331 spaced apart along the length direction Y, separated by a first protrusion 3211. The second channel 34 includes two second communication portions 341 spaced apart along the length direction Y, separated by a second protrusion 3212.

[0162] The first tab 21 includes a plurality of stacked first tab layers 211 . The total length of the first channel 33 and the first protrusion 3211 along the length direction Y is equal to the width of the first tab layer 211 plus twice the staggered size of the plurality of first tab layers 211 along the length direction Y.

[0163] A chamfer is provided at a position where the first protrusion 321 is adjacent to the first channel 33 , and a chamfer is provided at a position where the first protrusion 321 is adjacent to the second channel 34 .

[0164] 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 them. 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 or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: a housing having an opening; an end cover connected to the housing and covering the opening; A first electrode lead-out portion is provided on the end cover; an electrode assembly disposed in the housing, wherein the electrode assembly has a first tab on a side facing the end cap, the first tab being electrically connected to the first electrode lead-out portion; as well as An insulating member includes an insulating body and a protrusion, wherein the insulating body is arranged between the end cover and the electrode assembly, the protrusion is arranged along the edge of the insulating body and protrudes from the first surface of the insulating body away from the end cover, and at least a portion of the first electrode tab is located on the inner side of the protrusion; the insulating member is provided with a first channel passing through the protrusion, and at least a portion of the first electrode tab is exposed to the outside of the protrusion through the first channel.

2. The battery cell according to claim 1, wherein: The protrusion includes a first protrusion, which is arranged along an edge of the insulating body in the width direction of the end cover, and the width direction of the end cover is perpendicular to the width direction of the first tab; The first channel passes through the first protrusion along the width direction of the end cover.

3. The battery cell according to claim 2, characterized in that: The first channel extends continuously along the length direction of the end cover; Along the length direction of the end cover, the first channel extends beyond the first electrode tab; or, along the length direction of the end cover, two ends of the first channel are aligned with two ends of the first electrode tab respectively.

4. The battery cell according to claim 3, characterized in that The length of the first channel along the length direction of the end cover is L1, and the length direction of the end cover is parallel to the width direction of the first tab; The first electrode tab includes a plurality of stacked first electrode tab layers, each of which has a width L2 along the length direction of the end cover, and L1 and L2 satisfy the following: L1≥1.05L2.

5. The battery cell according to claim 2, characterized in that The first convex portion includes a first protrusion, the first channel includes a plurality of first connecting portions spaced apart along the length direction of the end cover, two adjacent first connecting portions are separated by the first protrusion, and the length direction of the end cover is parallel to the width direction of the first tab.

6. The battery cell according to claim 5, characterized in that Along the length direction of the end cover, the first channel and each of the first protrusions form a whole that exceeds the first tab; or Along the length direction of the end cover, two ends of the integral body formed by the first channel and each of the first protrusions are aligned with two ends of the first electrode tab.

7. The battery cell according to claim 6, characterized in that The length of the whole formed by the first channel and each first protrusion along the length direction of the end cover is L3, the first pole tab includes a plurality of first pole tab layers stacked together, and the width of each first pole tab layer along the length direction of the end cover is L2, and L2 and L3 satisfy: L3≥1.05L2.

8. The battery cell according to claim 5, characterized in that The first electrode lead-out portion includes a first adapter, which is provided on a side of the insulating body away from the end cover and is connected to the first electrode tab; Along the width direction of the end cover, the projection of the first adapter partially overlaps with the projection of the first protrusion.

9. The battery cell according to claim 8, characterized in that Along the thickness direction of the end cover, the first adapter does not exceed the protruding portion.

10. The battery cell according to claim 1, characterized in that The protrusion includes a first end surface facing away from the insulating body, and the first channel is recessed in the first end surface.

11. The battery cell according to claim 1, characterized in that The protrusion includes a first end surface, a first side surface, and two second surfaces, wherein the first end surface faces away from the insulating body, the first side surface faces the first channel, and the two second surfaces are arranged opposite to each other along the thickness direction of the protrusion; The first end surface is smoothly connected to the first side surface, and each of the second surfaces is smoothly connected to the first side surface.

12. The battery cell according to claim 2, characterized in that: There are two first channels, and the two first channels are arranged opposite to each other along the width direction of the end cover; at least part of the first tab is exposed to the outside of the protrusion through the two first channels.

13. The battery cell according to claim 1, characterized in that The electrode assembly has a second tab on a side facing the end cap, the second tab has a polarity opposite to that of the first tab, and at least a portion of the second tab is located inside the protrusion; The insulating member is provided with a second channel penetrating the protruding portion, and at least a portion of the second electrode tab is exposed outside the protruding portion through the second channel.

14. A battery device, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 13.

15. An electrical device, characterized in that: The battery device according to claim 14 is included, and is used to provide electrical energy.

Images