Battery cell, battery device, and electric device

Abstract

This application provides a battery cell, a battery device, and an electrical device. The battery cell includes a casing, an electrode assembly, and an insulating member. The casing includes a wall portion. The electrode assembly is housed within the casing and includes a main body portion, a positive electrode tab, and a negative electrode tab. The positive and negative electrode tabs extend from the ends of the main body portion facing the wall portion and are spaced apart along a first direction. The dimension of the positive electrode tab along the first direction is larger than that of the negative electrode tab along the first direction. The insulating member includes an insulating body and a first protrusion. The insulating body is disposed on the wall portion and separates the wall portion from the positive electrode tab and from the negative electrode tab. In the first direction, the first protrusion is located between the positive and negative electrode tabs. The distance between the first protrusion and the wall portion along the first direction adjacent to the edge of the positive electrode tab is greater than the distance between the first protrusion and the wall portion along the first direction adjacent to the edge of the negative electrode tab. This application can improve the reliability of the battery cell.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

[0002] Battery cells are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and rechargeable alkaline zinc-manganese battery cells, among others.

[0003] In the development of battery technology, improving the reliability of individual battery cells has always been a research direction. Summary of the Invention

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can improve the reliability of the battery cell.

[0005] In a first aspect, this application provides a battery cell including a casing, an electrode assembly, and an insulating member. The casing includes a wall portion. The electrode assembly is housed within the casing and includes a main body portion, a positive electrode tab, and a negative electrode tab. The positive and negative electrode tabs extend from the ends of the main body portion facing the wall portion and are spaced apart along a first direction. The dimension of the positive electrode tab along the first direction is larger than that of the negative electrode tab along the first direction. The insulating member includes an insulating body and a first protrusion. The insulating body is disposed on the wall portion and separates the wall portion from the positive electrode tab and from the negative electrode tab. The first protrusion protrudes from the side of the insulating body facing the electrode assembly. In the first direction, the first protrusion is located between the positive and negative electrode tabs. The distance between the first protrusion and the wall portion along the first direction adjacent to the edge of the positive electrode tab is greater than the distance between the first protrusion and the wall portion along the first direction adjacent to the edge of the negative electrode tab.

[0006] In the above scheme, by increasing the dimension of the positive electrode tab in the first direction, the current-carrying capacity of the positive electrode tab is improved, thereby reducing the risk of thermal runaway and improving the reliability of the battery cell. Simultaneously, since the distance between the edge of the wall adjacent to the positive electrode tab and the first protrusion along the first direction is greater than the distance between the edge of the wall adjacent to the negative electrode tab and the first protrusion along the first direction, the accommodating space of the positive electrode tab is larger than that of the negative electrode tab, reducing the possibility of interference between the first protrusion and the positive electrode tab, thereby improving the manufacturing yield.

[0007] In some embodiments, the distance between the first protrusion and one side edge of the wall portion along the first direction is greater than half the dimension of the wall portion along the first direction.

[0008] In the above scheme, the above settings help to further increase the spatial size of the area where the positive electrode tab is located, thereby increasing the current carrying capacity of the positive electrode tab, improving the consistency of the current carrying capacity of the positive electrode tab and the negative electrode tab, improving the overall performance of the battery cell, and improving the reliability of the battery cell.

[0009] In some embodiments, the wall portion includes a first edge and a second edge opposite to each other along a first direction, and the first protrusion includes a third edge and a fourth edge opposite to each other along the first direction. The distance between the first edge and the third edge is less than half the dimension of the wall portion along the first direction, and the distance between the second edge and the fourth edge is less than half the dimension of the wall portion along the first direction.

[0010] In the above scheme, the distance between the first protrusion and the first edge is greater than the distance between the first protrusion and the second edge, so that the distance between the third edge and the central axis is less than the distance between the fourth edge and the central axis. This reduces the space occupied by the first protrusion in the area where the negative electrode tab is located, while increasing the space in the area where the positive electrode tab is located. This reduces the possibility of a decrease in the overcurrent capacity of the negative electrode tab and improves the overall performance of the battery cell.

[0011] In some embodiments, the insulating member further includes a second protrusion and a third protrusion, which are disposed at both ends of the insulating member along a first direction. Both the second and third protrusions protrude from the side of the insulating body facing the main body and abut against the electrode assembly. A positive electrode tab is located between the first and second protrusions, and a negative electrode tab is located between the first and third protrusions.

[0012] In the above scheme, by setting the second protrusion and the third protrusion, the second protrusion and the third protrusion can restrict the electrode assembly from moving in the direction of the pressure relief mechanism when the battery cell opens the pressure relief mechanism, thereby reducing the possibility of the electrode assembly blocking the pressure relief mechanism and improving the reliability of the battery cell.

[0013] In some embodiments, the dimension of the second protrusion along the first direction is smaller than the dimension of the third protrusion along the first direction, which is beneficial to further increase the distance between the first protrusion and the second protrusion, thereby increasing the spatial dimension of the area where the positive electrode tab is located, improving the consistency of the overcurrent capacity of the positive electrode tab and the negative electrode tab, improving the overall performance of the battery cell, and improving the reliability of the battery cell.

[0014] In some embodiments, the dimension of the first protrusion along the first direction is L, and the dimension of the insulating member along the first direction is D, where L and D satisfy: 0.01≤L / D≤0.1.

[0015] In the above scheme, by setting the ratio of the dimension of the first protrusion along the first direction to the dimension of the insulating member along the first direction to be greater than or equal to 0.01, it is beneficial to increase the dimension of the first protrusion along the first direction, thereby increasing the contact area between the first protrusion and the main body, improving the support strength, and further reducing the possibility of the electrode assembly blocking the pressure relief channel when the battery cell pressure relief mechanism is opened; by setting the ratio of the dimension of the first protrusion along the first direction to the dimension of the insulating member along the first direction to be less than or equal to 0.1, it is beneficial to reduce the space occupied by the first protrusion in the first direction, thereby increasing the space dimension of the area where the positive electrode tab is located, which in turn is beneficial to increase the dimension of the positive electrode tab, increase the current carrying capacity of the positive electrode tab, improve the consistency of the current carrying capacity of the positive electrode tab and the negative electrode tab, improve the overall performance of the battery cell, and improve the reliability of the battery cell.

[0016] In some embodiments, the wall portion is provided with a pressure relief mechanism, the insulating member is provided with a connecting region, the connecting region is disposed opposite to the pressure relief mechanism, and in the second direction, the first protrusion overlaps with the pressure relief mechanism at least partially, and the first direction, the second direction and the thickness direction of the battery cell intersect each other.

[0017] In the above scheme, the first protrusion can play a supporting role in the path of the pressure relief channel through the above settings, thereby reducing the possibility of the pressure relief channel being blocked after the insulation component itself is damaged.

[0018] In some embodiments, in the second direction, the first protrusion is spaced apart from the center of the pressure relief mechanism.

[0019] In the above scheme, by setting the first protrusion further away from the positive electrode tab, the aim is to widen the spatial size of the area where the positive electrode tab is located, increase the current carrying capacity of the positive electrode tab, improve the heat dissipation efficiency of the positive electrode tab, and improve the reliability of the battery cell.

[0020] In some embodiments, a first partition extending along a first direction is provided in the communicating area, and a plurality of through holes are formed between the first partition and the insulating body.

[0021] In the above scheme, by setting a first partition, the first partition can play a shielding role, which helps to reduce the possibility of other structures damaging the pressure relief mechanism during the manufacturing process. At the same time, setting a through hole helps to reduce the shielding of the pressure relief mechanism by the insulating parts when the pressure relief mechanism is opened, speeds up the opening time of the pressure relief channel, and improves the reliability of the battery cell.

[0022] In some embodiments, a second partition extending along a second direction is provided in the communicating region. The second partition is at least connected to the first partition. A plurality of through holes are formed between the first partition, the second partition, and the insulating body. The first direction, the second direction, and the thickness direction of the battery cell intersect each other.

[0023] In the above scheme, setting a second partition helps to increase the structural stability of the connection area, reduce the possibility of damage or even destruction to the connection area in other structural manufacturing processes, improve the preparation yield of battery cells, and improve the reliability of battery cells.

[0024] In some embodiments, the electrode assembly includes a positive electrode sheet, which includes a positive electrode sheet body and a positive electrode tab. The body includes the positive electrode sheet body, which includes an insulating layer, a conductive layer on the surface of the insulating layer, and a positive active material layer on the surface of the conductive layer. The positive electrode tab is electrically connected to the conductive layer.

[0025] In the above scheme, the above settings help to reduce the overall thickness of the conductive layer of the positive electrode, thereby reducing the burrs generated during the preparation of the positive electrode, reducing the possibility of short circuit caused by burrs piercing the separator between the positive and negative electrodes, and improving the reliability of the battery cell.

[0026] In some embodiments, the electrode assembly further includes a negative electrode sheet, which includes a negative electrode sheet body and a negative electrode tab. The body portion includes a negative electrode sheet body and a negative electrode sheet body. The negative electrode sheet includes a current collector and a negative electrode active material layer. The current collector includes a coated area and a blank area. The negative electrode active material layer is disposed in the coated area to form the negative electrode sheet body, and the blank area forms the negative electrode tab.

[0027] In the above scheme, the above settings, combined with the above positive electrode tab, help to reduce the possibility of burrs piercing the insulating component during the electrode assembly manufacturing process, reduce the possibility of short circuit in the electrode assembly, and reduce the manufacturing cost of the electrode assembly.

[0028] In some embodiments, the housing includes a shell and an end cap, the shell having an opening, the end cap closing the opening, and a wall portion disposed on the end cap, which facilitates the simplification of the assembly of electrode assemblies, insulating components, and the housing, and improves the assembly efficiency of the battery cell.

[0029] Secondly, embodiments of this application provide a battery device, including the battery cell in any of the foregoing embodiments.

[0030] Thirdly, embodiments of this application provide an electrical device, including the battery device in any of the foregoing embodiments, the battery device being used to provide electrical energy.

[0031] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application;

[0034] Figure 2 This is an exploded structural diagram of a battery device provided in an embodiment of this application;

[0035] Figure 3 This is a schematic diagram of the structure of a battery module provided in an embodiment of this application;

[0036] Figure 4 This is a schematic diagram of the exploded structure of a single battery cell provided in an embodiment of this application;

[0037] Figure 5 This is a schematic cross-sectional view of a single battery cell provided in an embodiment of this application;

[0038] Figure 6 This is an exploded structural diagram of the end cap and insulating component of a battery cell provided in an embodiment of this application;

[0039] Figure 7 This is an exploded structural diagram of the end cap and insulating component of another battery cell provided in the embodiments of this application;

[0040] Figure 8 This is a schematic diagram of the structure of an insulating component in a battery cell provided in an embodiment of this application;

[0041] Figure 9 This is a schematic diagram of the structure of an insulating component in a battery cell provided in another embodiment of this application;

[0042] Figure 10 This is a schematic diagram of the structure of an insulating component in a battery cell provided in another embodiment of this application;

[0043] Figure 11 This is a schematic diagram of the structure of an insulating component in a battery cell provided in another embodiment of this application;

[0044] Figure 12 This is a schematic diagram of the structure of an insulating component in a battery cell provided in another embodiment of this application;

[0045] Figure 13 This is a cross-sectional structural diagram of an electrode assembly in a battery cell provided in an embodiment of this application.

[0046] Marker description

[0047] 1000, vehicles;

[0048] 100. Battery assembly; 110. Battery cell; 200. Control system; 300. Motor; 400. Housing; 410. First housing section; 420. Second housing section; 430. Receiving section; 500. Battery module;

[0049] 10. Outer shell; 11. Wall; 111. First edge; 112. Second edge; 12. Housing; 13. End cap;

[0050] 20. Electrode assembly; 21. Main body; 211. Positive electrode body; 211a. Insulating layer; 211b. Conductive layer; 211c. Positive active material layer; 212. Negative electrode body; 212a. Negative active material layer; 22. Positive electrode tab; 23. Negative electrode tab;

[0051] 30. Insulating component; 31. Insulating body; 32. First protrusion; 321. Third edge; 322. Fourth edge; 33. Second protrusion; 34. Third protrusion; 35. Connecting region; 351. First partition; 352. Second partition; 353. Through hole;

[0052] 40. Pressure relief mechanism; 50. Adapter; 60. Isolation component; X, first direction; Y, second direction; Z, thickness direction. Detailed Implementation

[0053] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0055] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0056] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0057] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0058] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0059] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0060] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0061] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0062] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0063] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0064] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0065] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0066] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0067] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0068] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0069] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0070] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely applied in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in military equipment and aerospace. With the continuous expansion of battery device applications, market demand is also constantly increasing.

[0071] A battery device comprises multiple battery cells, each including an electrode assembly. The electrode assembly includes a positive electrode tab and a negative electrode tab, typically of the same size. Because the materials of the positive and negative active material layers differ, different conductive materials are used for the positive and negative electrode tabs to improve electrochemical compatibility. For example, the positive electrode tab may be made of aluminum, while the negative electrode tab may be made of copper. However, the identical size of the positive and negative electrode tabs results in a lower current-carrying capacity for the positive electrode tab compared to the negative electrode tab. This can lead to localized overheating, accelerated aging of materials within the battery cell, and even the risk of thermal runaway, reducing the reliability of the battery cell.

[0072] To address the aforementioned technical problems, this application provides a technical solution that increases the current-carrying capacity of the positive electrode tab in the first direction, thereby reducing the risk of thermal runaway and improving the reliability of the battery cell. Simultaneously, because the distance between the edge of the wall adjacent to the positive electrode tab and the first protrusion along the first direction is greater than the distance between the edge of the wall adjacent to the negative electrode tab and the first protrusion along the first direction, the accommodating space of the positive electrode tab is larger than that of the negative electrode tab, reducing the possibility of interference between the first protrusion and the positive electrode tab, thereby improving the manufacturing yield.

[0073] The technical solutions described in this application are applicable to battery devices and electrical devices using battery devices. Electrical devices include, for example, mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools. Spacecraft include, for example, airplanes, rockets, space shuttles, and spacecraft. Electric toys include, for example, stationary or mobile electric toys, specifically, game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include, for example, metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, specifically, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0074] The battery cells described in this application are not limited to the electrical devices described above, but for the sake of brevity, the following embodiments are all illustrated using electric vehicles as an example.

[0075] Please see Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in an embodiment of this application.

[0076] Vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 can be installed inside vehicle 1000, specifically, for example, at the bottom, front, or rear of vehicle 1000. The battery device 100 can be used to power vehicle 1000; for example, it can serve as the operating power source for vehicle 1000. Vehicle 1000 may also include a control system 200 and a motor 300. The control system 200, for example, controls the battery device to supply power to the motor 300. The battery device can be used for starting and navigating vehicle 1000. Of course, the battery device 100 can also be used to drive vehicle 1000, replacing or partially replacing gasoline or natural gas as the driving force for vehicle 1000.

[0077] Figure 2 This is an exploded structural diagram of a battery device provided in an embodiment of this application. Figure 2 As shown, the battery device 100 includes a housing 400 and battery cells (not shown in the figure), with the battery cells housed within the housing 400.

[0078] The housing 400 is used to house individual battery cells, and the housing 400 can have various structures. In some embodiments, the housing 400 may include a first housing portion 410 and a second housing portion 420, which overlap each other, and together define a receiving portion 430 for housing the individual battery cells. The second housing portion 420 may be a hollow structure with one end open, and the first housing portion 410 may be a plate-like structure, with the first housing portion 410 covering the open side of the second housing portion 420 to form a housing with the receiving portion 430; alternatively, both the first housing portion 410 and the second housing portion 420 may be hollow structures with one side open, with the open side of the first housing portion 410 covering the open side of the second housing portion 420 to form a housing 400 with the receiving portion 430. Of course, the first housing portion 410 and the second housing portion 420 can have various shapes, such as cylinders, cuboids, etc.

[0079] In the battery device 100, there can be multiple battery cells. These multiple battery cells can be connected in series, parallel, or in a hybrid configuration. A hybrid configuration means that multiple battery cells are connected in both series and parallel connections. Multiple battery cells can be directly connected in series, parallel, or in a hybrid configuration, and then the entire assembly of these multiple battery cells is housed within the housing 400. Alternatively, multiple battery cells can first be connected in series, parallel, or in a hybrid configuration to form a battery module 500, and then these battery modules 500 can be connected in series, parallel, or in a hybrid configuration to form a whole, which is then housed within the housing 400.

[0080] Figure 3This is a schematic diagram of the structure of a battery module provided in an embodiment of this application.

[0081] In some embodiments, such as Figure 3 As shown, there are multiple battery cells 110. These multiple battery cells 110 are first connected in series, parallel, or in a mixed manner to form a battery module 500. The multiple battery modules 500 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the casing.

[0082] Figure 4 This is a schematic diagram of the exploded structure of a battery cell provided in an embodiment of this application. Figure 5 This is a cross-sectional structural diagram of a battery cell provided in an embodiment of this application. Figure 6 This is an exploded structural diagram of the end cap and insulating component of a battery cell provided in an embodiment of this application.

[0083] Please see Figures 4 to 6 This application provides a battery cell 110. The battery cell 110 includes a housing 10, an electrode assembly 20, and an insulating member 30. The housing 10 includes a wall portion 11. The electrode assembly 20 is housed in the housing 10 and includes a main body portion 21, a positive electrode tab 22, and a negative electrode tab 23. The positive electrode tab 22 and the negative electrode tab 23 extend from the ends of the main body portion 21 facing the wall portion 11. The positive electrode tab 22 and the negative electrode tab 23 are spaced apart along a first direction X, and the dimension of the positive electrode tab 22 along the first direction X is larger than the dimension of the negative electrode tab 23 along the first direction X. The insulating member 30 includes an insulating body 31 and a first protrusion 32. The insulating body 31 is disposed on the wall portion 11 and separates the wall portion 11 from the positive electrode tab 22 and from the negative electrode tab 23. The first protrusion 32 protrudes from the side of the insulating body 31 facing the electrode assembly 20. In the first direction X, the first protrusion 32 is located between the positive electrode tab 22 and the negative electrode tab 23. The distance between the first protrusion 32 and the wall portion 11 along the first direction X and the adjacent edge of the positive electrode tab 22 is greater than the distance between the first protrusion 32 and the wall portion 11 along the first direction X and the adjacent edge of the negative electrode tab 23.

[0084] In some embodiments, the housing 10 includes a housing 12 and an end cap 13, and the housing 10 is used to encapsulate the electrode assembly 20 and electrolyte components. The housing 10 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 10), or an aluminum-plastic film, etc.

[0085] In some embodiments, the housing 10 may be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect with the electrode assembly 20 for outputting or inputting electrical energy into the battery cell 110.

[0086] In some embodiments, an adapter 50 may be provided inside the housing 10, and the electrode assembly 20 may be electrically connected to the housing 10 or the electrode terminals provided on the housing 10 through the adapter 50.

[0087] Optionally, the shape of the housing 12 may include a cuboid, a cube, or other shapes. Optionally, the shape of the end cap 13 may be matched with that of the housing 12.

[0088] Optionally, the thickness direction Z of the end cap 13 can be the direction in which the end cap 13 and the housing 12 are arranged side by side.

[0089] Optionally, the housing 12 may include one or two openings. For example, the housing 12 may include one opening disposed along the thickness direction Z. Alternatively, the housing 12 may include two openings disposed at both ends of the housing 12 along the thickness direction Z.

[0090] Alternatively, the number of openings on the housing 12 and the number of end caps 13 can be the same.

[0091] Alternatively, the end cap 13 may include a wall portion 11, or the housing 12 may include a wall portion 11.

[0092] Optionally, the electrode assembly 20 may include a main body 21, a positive electrode tab 22, and a negative electrode tab 23, with the main body 21 electrically connected to electrode terminals via the tabs. Optionally, the electrode assembly 20 includes a positive electrode sheet and a negative electrode sheet, with the positive electrode sheet including a positive electrode sheet body 211 and a positive electrode tab 22. The negative electrode sheet includes a negative electrode sheet body 212 and a negative electrode tab 23, with the positive electrode sheet body 211 and the negative electrode sheet body 212 forming the main body 21. Optionally, the electrode assembly 20 may be a wound or stacked electrode assembly 20.

[0093] The positive electrode tab 22 and the negative electrode tab 23 extend from the end of the main body 21 facing the wall portion 11, meaning that one end of the main body 21 along the second direction Y is positioned opposite the wall portion 11, and both the positive electrode tab 22 and the negative electrode tab 23 are located on the same side of the main body 21 along the second direction Y. The second direction Y, the first direction X, and the thickness direction Z of the battery cell 110 intersect each other. Optionally, the second direction Y, the first direction X, and the thickness direction Z of the battery cell 110 are perpendicular to each other.

[0094] The positive electrode tab 22 and the negative electrode tab 23 are spaced apart along the first direction X, which means that the positive electrode tab 22 and the negative electrode tab 23 are spaced apart along the first direction X on the end face of the main body 21 along the second direction Y.

[0095] The positive electrode tab 22 is larger in size along the first direction X than the negative electrode tab 23 along the first direction X, so that the connection area between the positive electrode tab 22 and the adapter 50 is larger than the connection area between the negative electrode tab 23 and the adapter 50, thereby improving the current carrying capacity of the positive electrode tab 22, improving the consistency of the current carrying capacity of the positive electrode tab 22 and the negative electrode tab 23, and thus improving the overall performance of the battery cell 110.

[0096] The insulating element 30 includes an insulating body 31 and a first protrusion 32. The insulating body 31 is disposed on the wall portion 11. The insulating body 31 is used to insulate the wall portion 11 from the positive electrode tab 22 and from the negative electrode tab 23, so as to reduce the possibility of short circuit caused by electrical connection between the wall portion 11 and the positive electrode tab 22 and the negative electrode tab 23.

[0097] Optionally, the shape of the insulating body 31 can match the shape of the wall portion 11. For example, the shape of the wall portion 11 is rectangular, and the shape of the insulating body 31 is rectangular.

[0098] The first protrusion 32 protrudes from the side of the insulating body 31 facing the electrode assembly 20, meaning that the first protrusion 32 protrudes from the panel of the insulating body 31 facing the electrode assembly 20 and extends in the direction toward the electrode assembly 20.

[0099] Optionally, the first protrusion 32 may abut against the electrode assembly 20. For example, the first protrusion 32 abuts against the end of the main body portion 21 facing the wall portion 11.

[0100] Optionally, the shape of the first protrusion 32 may include a cuboid, a cube, or other shapes.

[0101] Optionally, the number of first protrusions 32 may include one or more.

[0102] In the first direction X, the first protrusion 32 is located between the positive electrode tab 22 and the negative electrode tab 23. The distance between the first protrusion 32 and the wall portion 11 along the first direction X and the adjacent edge of the positive electrode tab 22 is greater than the distance between the first protrusion 32 and the wall portion 11 along the first direction X and the adjacent edge of the negative electrode tab 23. It can be understood that the wall portion 11 includes a first edge 111 and a second edge 112 that are opposite to each other along the first direction X. The projection of the positive electrode tab 22 on the wall portion 11 is located between the projection of the first protrusion 32 on the wall portion 11 and the first edge 111. The projection of the negative electrode tab 23 on the wall portion 11 is located between the projection of the first protrusion 32 on the wall portion 11 and the second edge 112. Furthermore, the distance between the first protrusion 32 and the first edge 111 is greater than the distance between the first protrusion 32 and the second edge 112.

[0103] In this embodiment, by increasing the dimension of the positive electrode tab 22 in the first direction X, the overcurrent capacity of the positive electrode tab 22 is improved, thereby reducing the risk of thermal runaway and improving the reliability of the battery cell 110. Simultaneously, since the distance between the edge of the wall portion 11 adjacent to the positive electrode tab 22 and the first protrusion 32 along the first direction X is greater than the distance between the edge of the wall portion 11 adjacent to the negative electrode tab 23 and the first protrusion 32 along the first direction X, the accommodating space of the positive electrode tab 22 is larger than the accommodating space of the negative electrode tab 23, thus reducing the possibility of interference between the first protrusion 32 and the positive electrode tab 22, thereby improving the manufacturing yield.

[0104] In some alternative embodiments, please refer to Figures 4 to 6 The distance between the first protrusion 32 and one side edge of the wall portion 11 along the first direction X is greater than half the dimension of the wall portion 11 along the first direction X.

[0105] For example, the wall portion 11 includes a first edge 111 along the first direction X, the projection of the positive electrode tab 22 on the wall portion 11 is located between the projection of the first protrusion 32 on the wall portion 11 and the first edge 111, and the distance between the first edge 111 and the first protrusion 32 is greater than half the size of the wall portion 11 along the first direction X.

[0106] Optionally, the wall portion 11 includes a second edge 112 along the first direction X, the projection of the negative electrode tab 23 on the wall portion 11 is located between the projection of the first protrusion 32 on the wall portion 11 and the second edge 112, and the distance between the second edge 112 and the first protrusion 32 is less than half the size of the wall portion 11 along the first direction X.

[0107] Optionally, the insulating member 30 may further include a first lead-out hole and a second lead-out hole. A portion of the positive electrode adapter 50 extends from the first lead-out hole and is electrically connected to the positive electrode terminal, and a portion of the negative electrode adapter 50 extends from the second lead-out hole and is electrically connected to the negative electrode terminal. Optionally, both the first lead-out hole and the second lead-out hole are disposed on the insulating body 31, and the first lead-out hole and the second lead-out hole are symmetrically arranged on the insulating body 31. The first protrusion 32 is spaced apart from the axis of symmetry of the first lead-out hole and the second lead-out hole. Optionally, the distance between the first protrusion 32 and the axis of symmetry can be 5mm to 12mm. For example, the distance between the first protrusion 32 and the axis of symmetry can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, or 12mm. Of course, the distance between the first protrusion 32 and the axis of symmetry can also be other distances. Optionally, the distance between the negative electrode tab 23 and the axis of symmetry is greater than the distance between the positive electrode tab 22 and the axis of symmetry.

[0108] In these alternative embodiments, the above-described arrangement helps to further increase the spatial size of the area where the positive electrode tab 22 is located, thereby increasing the current carrying capacity of the positive electrode tab 22, improving the consistency of the current carrying capacity of the positive electrode tab 22 and the negative electrode tab 23, improving the overall performance of the battery cell 110, and improving the reliability of the battery cell 110.

[0109] Figure 7 This is an exploded structural diagram of the end cap and insulating component of another battery cell provided in this application embodiment.

[0110] In some alternative embodiments, please refer to Figure 4 , Figure 5 as well as Figure 7 The wall portion 11 includes a first edge 111 and a second edge 112 opposite to each other along the first direction X. The first protrusion 32 includes a third edge 321 and a fourth edge 322 opposite to each other along the first direction X. The distance between the first edge 111 and the third edge 321 is less than half the size of the wall portion 11 along the first direction X, and the distance between the second edge 112 and the fourth edge 322 is less than half the size of the wall portion 11 along the first direction X.

[0111] For example, the side of the third edge 321 facing away from the fourth edge 322 is the first edge 111, and the side of the fourth edge 322 facing away from the third edge 321 is the second edge 112.

[0112] The distance between the first edge 111 and the third edge 321 is less than half the dimension of the wall portion 11 along the first direction X, and the distance between the second edge 112 and the fourth edge 322 is less than half the dimension of the wall portion 11 along the first direction X. This means that the first protrusion 32 can be located in the middle region of the insulating body 31, that is, the first protrusion 32 can pass through the central axis of the insulating body 31 along the first direction X. Furthermore, the distance between the first protrusion 32 and the first edge 111 is greater than the distance between the first protrusion 32 and the second edge 112, so that the distance between the third edge 321 and the central axis is less than the distance between the fourth edge 322 and the central axis. This reduces the space occupied by the first protrusion 32 in the area where the negative electrode tab 23 is located, while increasing the space in the area where the positive electrode tab 22 is located. This reduces the possibility of a decrease in the overcurrent capacity of the negative electrode tab 23 and improves the overall performance of the battery cell 110.

[0113] In some alternative embodiments, please refer to Figure 4 , Figure 5 as well as Figure 7The insulating member 30 also includes a second protrusion 33 and a third protrusion 34, which are respectively disposed at both ends of the insulating member 30 along the first direction X. Both the second protrusion 33 and the third protrusion 34 protrude from the side of the insulating body 31 facing the main body and abut against the electrode assembly 20. The positive electrode tab 22 is located between the first protrusion 32 and the second protrusion 33, and the negative electrode tab 23 is located between the first protrusion 32 and the third protrusion 34.

[0114] Optionally, the dimensions of the second protrusion 33 along the first direction X and the dimensions of the third protrusion 34 along the first direction X can be the same.

[0115] The second protrusion 33 and the third protrusion 34 are respectively disposed at both ends of the insulating member 30 along the first direction X. Both the second protrusion 33 and the third protrusion 34 protrude from the side of the insulating body 31 facing the main body and abut against the electrode assembly 20, meaning that the first protrusion 32 is located between the second protrusion 33 and the third protrusion 34. Furthermore, the second protrusion 33 protrudes from the side panel of the insulating body 31 facing the electrode assembly 20 and extends toward the electrode assembly 20, and the third protrusion 34 protrudes from the side panel of the insulating body 31 facing the electrode assembly 20 and extends toward the electrode assembly 20.

[0116] The positive electrode tab 22 is located between the first protrusion 32 and the second protrusion 33, and the negative electrode tab 23 is located between the first protrusion 32 and the third protrusion 34. This means that the projection of the positive electrode tab 22 onto the wall portion 11 lies between the projections of the first protrusion 32 onto the wall portion 11 and the second protrusion 33 onto the wall portion 11. The projection of the negative electrode tab 23 onto the wall portion 11 lies between the projections of the first protrusion 32 onto the wall portion 11 and the third protrusion 34 onto the wall portion 11.

[0117] Optionally, the distance between the first protrusion 32 and the second protrusion 33 is greater than the distance between the first protrusion 32 and the third protrusion 34.

[0118] Optionally, the dimensions of the first protrusion 32 along the first direction X and the dimensions of the second protrusion 33 along the first direction X can be the same or different. For example, the dimensions of the first protrusion 32 along the first direction X are greater than or less than the dimensions of the second protrusion 33 along the first direction X.

[0119] Optionally, the dimensions of the first protrusion 32 along the first direction X and the dimensions of the third protrusion 34 along the first direction X can be the same or different. For example, the dimension of the first protrusion 32 along the first direction X is greater than or less than the dimension of the third protrusion 34 along the first direction X.

[0120] In these alternative embodiments, by providing the second protrusion 33 and the third protrusion 34, the second protrusion 33 and the third protrusion 34 can restrict the electrode assembly 20 from moving toward the pressure relief mechanism 40 when the pressure relief mechanism 40 is activated, thereby reducing the possibility of the electrode assembly 20 blocking the pressure relief mechanism 40 and improving the reliability of the battery cell 110.

[0121] Figure 8 This is a schematic diagram of the structure of an insulating component in a battery cell provided in an embodiment of this application.

[0122] In some alternative embodiments, please refer to Figure 4 , Figure 5 as well as Figure 8 The second protrusion 33 is smaller in size along the first direction X than the third protrusion 34 along the first direction X, which helps to further increase the distance between the first protrusion 32 and the second protrusion 33, thereby increasing the spatial size of the area where the positive electrode tab 22 is located, improving the consistency of the overcurrent capacity of the positive electrode tab 22 and the negative electrode tab 23, improving the overall performance of the battery cell 110, and improving the reliability of the battery cell 110.

[0123] In some alternative embodiments, please refer to Figure 8 The dimension of the first protrusion 32 along the first direction X is L, and the dimension of the insulating member 30 along the first direction X is D. L and D satisfy: 0.01≤L / D≤0.1.

[0124] For example, the ratio of the dimension of the first protrusion 32 along the first direction X to the dimension of the insulating member 30 along the first direction X is 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08, 0.08 or 0.1.

[0125] In these alternative embodiments, by setting the ratio of the size of the first protrusion 32 along the first direction X to the size of the insulating member 30 along the first direction X to be greater than or equal to 0.01, it is beneficial to increase the size of the first protrusion 32 along the first direction X, thereby increasing the contact area between the first protrusion 32 and the main body 21, improving the support strength, and further reducing the possibility of the electrode assembly 20 blocking the pressure relief channel when the pressure relief mechanism 40 of the battery cell 110 is opened; by setting the ratio of the size of the first protrusion 32 along the first direction X to the size of the insulating member 30 along the first direction X to be less than or equal to 0.1, it is beneficial to reduce the space occupied by the first protrusion 32 in the first direction X, thereby increasing the space size of the area where the positive electrode tab 22 is located, which in turn is beneficial to increase the size of the positive electrode tab 22, increase the current carrying capacity of the positive electrode tab 22, improve the consistency of the current carrying capacity of the positive electrode tab 22 and the negative electrode tab 23, improve the overall performance of the battery cell 110, and improve the reliability of the battery cell 110.

[0126] In some alternative embodiments, please refer to Figure 4 , Figure 5 , Figure 7 and Figure 8 The wall portion 11 is provided with a pressure relief mechanism 40, and the insulating component 30 is provided with a connecting area 35. The connecting area is arranged opposite to the pressure relief mechanism 40. In the second direction Y, the first protrusion 32 overlaps at least partially with the pressure relief mechanism 40. The first direction X, the second direction Y, and the thickness direction Z of the battery cell 110 intersect each other.

[0127] The pressure relief mechanism 40 is used to release the internal gas of the battery cell 110.

[0128] As an example, the internal pressure or temperature of the battery cell 110 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 110 reaches the predetermined threshold, the pressure relief mechanism 40 is activated or a weak structure provided in the pressure relief mechanism 40 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies depending on the design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator 60 in the battery cell 110.

[0129] As an example, the pressure relief mechanism 40 can be integrally formed with the housing 10.

[0130] As an example, the pressure relief mechanism 40 can also be separately configured and connected to the housing 10.

[0131] The term "actuation" as used in this application refers to the pressure relief mechanism 40 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 110. The actions of the pressure relief mechanism 40 may include, but are not limited to: movement of components within the pressure relief mechanism 40 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 40, etc. When the pressure relief mechanism 40 is actuated, the high-temperature, high-pressure substances inside the battery cell 110 are discharged outwards from the actuated portion as waste. This method allows for pressure and temperature relief of the battery cell 110 under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0132] In some embodiments, when the housing 10 is a non-sealed structure, the pressure relief mechanism 40 can be configured as a through hole 353 for discharging gas inside the battery cell 110.

[0133] The emissions from the battery cell 110 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of the separator 60, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0134] The communicating region 35 of the insulating member 30 is disposed opposite to the pressure relief mechanism 40, meaning that the projection of the communicating region 35 along the second direction Y and the projection of the pressure relief mechanism 40 along the second direction Y at least partially overlap. Optionally, the projection of the communicating region 35 along the second direction Y and the projection of the pressure relief mechanism 40 along the second direction Y overlap. Alternatively, the projection of the communicating region 35 along the second direction Y and the projection of the pressure relief mechanism 40 along the second direction Y partially overlap. Alternatively, the projection of the pressure relief mechanism 40 along the second direction Y falls within the projection of the communicating region 35 along the second direction Y.

[0135] Optionally, the projection of the first protrusion 32 along the second direction Y overlaps with the projection of the pressure relief mechanism 40 along the second direction Y. Alternatively, the projection of the first protrusion 32 along the second direction Y partially overlaps with the projection of the pressure relief mechanism 40 along the second direction Y. Alternatively, the projection of the first protrusion 32 along the second direction Y falls within the projection of the pressure relief mechanism 40 along the second direction Y.

[0136] A through hole 353 may be provided within the connecting region 35, which can serve as a pressure relief channel when the pressure relief mechanism 40 is activated. Optionally, the connecting region 35 may also be a thinned region, for example, the thickness of the connecting region 35 may be less than the thickness of other regions of the insulating body 31.

[0137] In these alternative embodiments, the above-described configuration allows the first protrusion 32 to act as a support along the path of the pressure relief channel, thereby reducing the possibility of the pressure relief channel being blocked after the insulation component 30 itself is damaged.

[0138] In some alternative embodiments, please refer to Figure 7 and Figure 8 In the second direction Y, the first protrusion 32 is spaced apart from the center of the pressure relief mechanism 40.

[0139] For example, the projection of the first protrusion 32 along the second direction Y is spaced apart from the center of the projection of the pressure relief mechanism 40 along the second direction Y, and the first protrusion 32 is located on the side of the center of the pressure relief mechanism 40 away from the positive electrode tab 22.

[0140] The center of the pressure relief mechanism 40 can be the geometric center of the pressure relief mechanism 40 or the geometric center of the cross-section of the pressure relief channel after the pressure relief mechanism 40 is opened.

[0141] In these alternative embodiments, the first protrusion 32 is further adjusted away from the positive electrode tab 22 by the above-described arrangement, which aims to widen the spatial size of the area where the positive electrode tab 22 is located, increase the current carrying capacity of the positive electrode tab 22, improve the heat dissipation efficiency of the positive electrode tab 22, and improve the reliability of the battery cell 110.

[0142] Figure 9This is a schematic diagram of the structure of an insulating component in a battery cell provided in an embodiment of this application.

[0143] In some alternative embodiments, please refer to Figure 8 and Figure 9 The connecting region 35 is provided with a first partition 351 extending along the first direction X, and a plurality of through holes 353 are formed between the first partition and the insulating body 31.

[0144] For example, the number of first partitions 351 may include one or more.

[0145] Optionally, when the number of first partitions 351 includes one, two through holes 353 are formed between the first partition 351 and the insulating body 31.

[0146] Optionally, when there are multiple first partitions 351, multiple through holes 353 are formed between the first partitions 351 and the insulating body 31.

[0147] Optionally, the lengths of the plurality of first partitions 351 along the first direction X may be the same or different.

[0148] Optionally, such as Figure 9 As shown, when the connecting region 35 overlaps with the first protrusion 32, the through hole 353 penetrates the insulating body 31 and the first protrusion 32.

[0149] Optionally, such as Figure 8 As shown, when the connected region 35 partially overlaps with the first protrusion 32, a portion of the through holes 353 penetrate the insulating body 31, and another portion of the through holes 353 penetrate the insulating body 31 and the first protrusion 32.

[0150] In these alternative embodiments, by providing a first partition 351, the first partition can act as a shield, which helps to reduce the possibility of other structures damaging the pressure relief mechanism 40 during the manufacturing process. At the same time, by providing a through hole 353, it helps to reduce the shielding of the pressure relief mechanism 40 by the insulating part 30 when the pressure relief mechanism 40 is opened, speeds up the opening time of the pressure relief channel, and improves the reliability of the battery cell 110.

[0151] Figure 10 This is a schematic diagram of the structure of an insulating component in a battery cell provided in an embodiment of this application. Figure 11 This is a schematic diagram of the structure of an insulating component in a battery cell provided in an embodiment of this application. Figure 12 This is a schematic diagram of the structure of an insulating component in a battery cell provided in an embodiment of this application.

[0152] In some alternative embodiments, please refer to Figures 10 to 12The connecting area 35 is provided with a second partition 352 extending along the second direction Y. The second partition is at least connected to the first partition 351. A plurality of through holes 353 are formed between the first partition, the second partition 352 and the insulating body 31. The first direction X, the second direction Y and the thickness direction Z of the battery cell 110 intersect each other.

[0153] Optionally, the second partition 352 may be connected only to the first partition 351, or the two ends of the second partition 352 along the second direction Y may be connected to the insulating body 31, and the middle region of the second partition 352 may be connected to the first partition 351.

[0154] Optionally, the number of second partitions 352 may include one or more.

[0155] Optionally, the dimensions of the plurality of second partitions 352 along the second direction Y can be the same or different.

[0156] Optionally, the dimensions of the first partition 351 along its own width direction and the dimensions of the second partition 352 along its own width direction may be the same or different.

[0157] Optionally, such as Figure 10 As shown, when the connecting region 35 partially overlaps with the first protrusion 32, the second dividing part 352 and the first protrusion 32 can be spaced apart.

[0158] In these alternative embodiments, providing a second partition 352 helps to increase the structural stability of the connection region, reduce the possibility of damage or even destruction to the connection region in other structural fabrication processes, improve the fabrication yield of the battery cell 110, and improve the reliability of the battery cell 110.

[0159] Figure 13 This is a cross-sectional structural diagram of an electrode assembly in a battery cell provided in an embodiment of this application.

[0160] In some alternative embodiments, please refer to Figure 13 The electrode assembly 20 includes a positive electrode sheet, which includes a positive electrode sheet body 211 and a positive electrode tab 22. The body part 21 includes the positive electrode sheet body 211, which includes an insulating layer 211a, a conductive layer 211b located on the surface of the insulating layer, and a positive active material layer 211c located on the surface of the conductive layer. The positive electrode tab 22 is electrically connected to the conductive layer 211b.

[0161] In some embodiments, the positive electrode body 211 has a multilayer structure. The insulating layer 211a may have conductive layers 211b on both sides of its thickness direction Z, or it may have conductive layers 211b on only one side. The positive electrode active material layer 211c is located on the side of the conductive layer 211b that faces away from the insulating layer 211a.

[0162] In some embodiments, the positive electrode body 211 extends along the second direction Y and forms a connecting portion, the connecting portion including a conductive layer 211b and an insulating layer 211a, and the positive electrode tab 22 is electrically connected to the conductive layer 211b through the connecting portion. Optionally, the positive electrode tab 22 and the connecting portion can be connected by welding.

[0163] In these alternative embodiments, the above-described configuration helps to reduce the overall thickness of the conductive layer 211b of the positive electrode, thereby reducing the burrs generated during the preparation of the positive electrode, reducing the possibility of burrs piercing the separator 60 between the positive and negative electrodes and causing a short circuit, and improving the reliability of the battery cell 110.

[0164] In some alternative embodiments, please refer to Figures 4 to 7 The electrode assembly 20 also includes a negative electrode sheet, which includes a negative electrode sheet body 212 and a negative electrode tab 23. The body portion 21 includes the negative electrode sheet body 212 and the negative electrode sheet body. The negative electrode sheet includes a current collector and a negative electrode active material layer 212a. The current collector includes a coated area and a blank area. The negative electrode active material layer 212a is disposed in the coated area to form the negative electrode sheet body 212, and the blank area forms the negative electrode tab 23.

[0165] Optionally, the active material layer can be coated on both sides of the current collector along its thickness direction Z, or the active material layer can be coated on only one side.

[0166] Optionally, the positive electrode body 211 and the negative electrode body 212 can be formed into the main body 21 by means of stacking, winding or other methods.

[0167] Optionally, the coated area refers to the area on the current collector where an active material layer is provided, and the blank area refers to the area on the current collector where no active material layer is provided.

[0168] Optionally, the material of the current collector may include copper, and the material of the conductive layer 211b may include aluminum.

[0169] Optionally, the thickness of the positive electrode tab 22 and the thickness of the negative electrode tab 23 can be the same or different.

[0170] Optionally, an insulating element 60 is provided between the positive electrode and the negative electrode.

[0171] In these alternative embodiments, the above-described configuration, combined with the positive electrode tab 22, helps to reduce the possibility of burrs piercing the insulating member 60 during the preparation of the electrode assembly 20, reduces the possibility of short circuit in the electrode assembly 20, and reduces the preparation cost of the electrode assembly 20.

[0172] In some alternative embodiments, please refer to Figure 4 The outer casing 10 includes a housing 12 and an end cap 13. The housing has an opening, and the end cap closes to the opening. The wall portion 11 is disposed on the end cap 13, which helps to simplify the assembly of the electrode assembly 20, the insulating component 30, and the outer casing 10, and improves the assembly efficiency of the battery cell 110.

[0173] Secondly, embodiments of this application provide a battery cell 110, including the power-consuming device in any of the foregoing embodiments.

[0174] Thirdly, embodiments of this application provide an electrical device, including the battery device 100 in any of the foregoing embodiments, the battery device being used to provide electrical energy.

[0175] According to some embodiments of this application, please refer to Figures 4 to 6 , Figure 8 , Figure 12 as well as Figure 13 The battery cell 110 includes a housing 10, an electrode assembly 20, and an insulating member 30. The housing 10 includes a wall portion 11. The electrode assembly 20 is housed in the housing 10 and includes a main body portion 21, a positive electrode tab 22, and a negative electrode tab 23. The positive and negative electrode tabs extend from the ends of the main body portion 21 facing the wall portion 11. The positive electrode tab 22 and the negative electrode tab 23 are spaced apart along a first direction X, and the dimension of the positive electrode tab 22 along the first direction X is larger than the dimension of the negative electrode tab 23 along the first direction X. The insulating member 30 includes an insulating body 31 and a first protrusion 32. The insulating body is disposed on the wall portion 11 and separates the wall portion 11 from the positive electrode tab 22 and from the negative electrode tab 23. The first protrusion 32 protrudes from the side of the insulating body 31 facing the electrode assembly 20. In the first direction X, the first protrusion 32 is located between the positive electrode tab 22 and the negative electrode tab 23. The distance between the first protrusion 32 and the wall portion 11 along the first direction X and the adjacent edge of the positive electrode tab 22 is greater than the distance between the first protrusion 32 and the wall portion 11 along the first direction X and the adjacent edge of the negative electrode tab 23.

[0176] The distance between the first protrusion 32 and one side edge of the wall portion 11 along the first direction X is greater than half the dimension of the wall portion 11 along the first direction X.

[0177] The insulating member 30 also includes a second protrusion 33 and a third protrusion 34, which are disposed at both ends of the insulating member 30 along the first direction X. Both the second protrusion 33 and the third protrusion 34 protrude from the side of the insulating body 31 facing the main body and abut against the electrode assembly 20. The positive electrode tab 22 is located between the first protrusion 32 and the second protrusion 33, and the negative electrode tab 23 is located between the first protrusion 32 and the third protrusion 34. The dimension of the second protrusion 33 along the first direction X is smaller than the dimension of the third protrusion 34 along the first direction X.

[0178] The wall portion 11 is provided with a pressure relief mechanism 40, and the insulating member 30 is provided with a connecting region 35. The connecting region is disposed opposite to the pressure relief mechanism 40. In the second direction Y, the first protrusion 32 at least partially overlaps with the pressure relief mechanism 40. The first direction X, the second direction Y, and the thickness direction Z of the battery cell 110 intersect each other. In the second direction Y, the first protrusion 32 and the pressure relief mechanism 40 are spaced apart at their centers.

[0179] The connecting region 35 is provided with a first partition 351 extending along the first direction X, and a plurality of through holes 353 are formed between the first partition and the insulating body 31. The connecting region 35 is provided with a second partition 352 extending along the second direction Y, and the second partition is at least connected to the first partition 351. A plurality of through holes 353 are formed between the first partition, the second partition 352 and the insulating body 31. The first direction X, the second direction Y and the thickness direction Z of the battery cell 110 intersect each other.

[0180] The electrode assembly 20 includes a positive electrode sheet, which includes a positive electrode sheet body 211 and a positive electrode tab 22. The body portion 21 includes the positive electrode sheet body 211, which includes an insulating layer 211a, a conductive layer 211b on the surface of the insulating layer, and a positive active material layer 211c on the surface of the conductive layer. The positive electrode tab 22 is electrically connected to the conductive layer 211b. The electrode assembly 20 also includes a negative electrode sheet, which includes a negative electrode sheet body 212 and a negative electrode tab 23. The body portion 21 includes the negative electrode sheet body 212 and the negative electrode sheet body. The negative electrode sheet includes a current collector and a negative active material layer 212a. The current collector includes a coated area and a blank area. The negative active material layer 212a is disposed in the coated area to form the negative electrode sheet body 212, and the blank area forms the negative electrode tab 23.

[0181] The housing 10 includes a housing 12 and an end cap 13. The housing has an opening, the end cap closes to the opening, and a wall portion 11 is disposed on the end cap.

[0182] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, include: The outer casing, including the walls; An electrode assembly is housed in the housing. The electrode assembly includes a main body, a positive electrode tab, and a negative electrode tab. The positive electrode tab and the negative electrode tab extend from the end of the main body facing the wall portion. The positive electrode tab and the negative electrode tab are spaced apart along a first direction. The dimension of the positive electrode tab along the first direction is larger than the dimension of the negative electrode tab along the first direction. An insulating element includes an insulating body and a first protrusion. The insulating body is disposed on the wall portion and separates the wall portion from the positive electrode tab and from the negative electrode tab. The first protrusion protrudes from the side of the insulating body facing the electrode assembly. In the first direction, the first protrusion is located between the positive electrode tab and the negative electrode tab. The distance between the first protrusion and the wall portion along the first direction and the edge adjacent to the positive electrode tab is greater than the distance between the first protrusion and the wall portion along the first direction and the edge adjacent to the negative electrode tab.

2. The battery cell of claim 1, wherein, The distance between the first protrusion and one side edge of the wall portion along the first direction is greater than half the dimension of the wall portion along the first direction.

3. The battery cell of claim 1, wherein, The wall portion includes a first edge and a second edge opposite to each other along the first direction, and the first protrusion includes a third edge and a fourth edge opposite to each other along the first direction. The distance between the first edge and the third edge is less than half the dimension of the wall portion along the first direction, and the distance between the second edge and the fourth edge is less than half the dimension of the wall portion along the first direction.

4. The battery cell according to any one of claims 1 to 3, characterized in that, The insulating member further includes a second protrusion and a third protrusion, which are disposed at both ends of the insulating member along the first direction. The second protrusion and the third protrusion both protrude from the side of the insulating body facing the main body and abut against the electrode assembly. The positive electrode tab is located between the first protrusion and the second protrusion, and the negative electrode tab is located between the first protrusion and the third protrusion.

5. The battery cell according to claim 4, characterized in that, The dimension of the second protrusion along the first direction is smaller than the dimension of the third protrusion along the first direction.

6. The battery cell according to claim 1, characterized in that, The dimension of the first protrusion along the first direction is L, and the dimension of the insulating member along the first direction is D, where L and D satisfy: 0.01≤L / D≤0.

1.

7. The battery cell according to claim 1, characterized in that, The wall portion is provided with a pressure relief mechanism, and the insulating component is provided with a connecting area. The connecting area is disposed opposite to the pressure relief mechanism. In the second direction, the first protrusion overlaps with the pressure relief mechanism at least partially. The first direction, the second direction, and the thickness direction of the battery cell intersect each other.

8. The battery cell according to claim 7, characterized in that, In the second direction, the first protrusion is spaced apart from the center of the pressure relief mechanism.

9. The battery cell according to claim 8, characterized in that, The connected area is provided with a first partition extending along the first direction, and a plurality of through holes are formed between the first partition and the insulating body.

10. The battery cell according to claim 9, characterized in that, The connected area is provided with a second partition extending along the second direction. The second partition is at least connected to the first partition. Multiple through holes are formed between the first partition, the second partition and the insulating body. The first direction, the second direction and the thickness direction of the battery cell intersect each other.

11. The battery cell according to claim 1, characterized in that, The electrode assembly includes a positive electrode sheet, which includes a positive electrode sheet body and a positive electrode tab. The body includes the positive electrode sheet body, which includes an insulating layer, a conductive layer on the surface of the insulating layer, and a positive active material layer on the surface of the conductive layer. The positive electrode tab is electrically connected to the conductive layer.

12. The battery cell according to claim 11, characterized in that, The electrode assembly further includes a negative electrode sheet, which includes a negative electrode sheet body and a negative electrode tab. The body portion includes the negative electrode sheet body and the negative electrode sheet body. The negative electrode sheet includes a current collector and a negative electrode active material layer. The current collector includes a coated area and a blank area. The negative electrode active material layer is disposed in the coated area to form the negative electrode sheet body, and the blank area forms the negative electrode tab.

13. The battery cell according to claim 1, characterized in that, The housing includes a shell and an end cap, the shell having an opening, the end cap closing onto the opening, and the wall portion disposed on the end cap.

14. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1 to 13.

15. An electrical appliance, characterized in that, Includes the battery device as described in claim 14, the battery device being used to provide electrical energy.

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