Battery cell, battery and electrical device

Abstract

Disclosed in an embodiment of the present application are a battery cell, a battery, and an electrical device. The battery cell comprises an electrode assembly and an insulating part for wrapping at least part of the electrode assembly, wherein the insulating part comprises a first insulating structure and a second insulating structure, the first insulating structure being of a hollow structure with an opening at an end, the hollow structure being used for accommodating the electrode assembly, and the second insulating structure being configured to cover the opening of the first insulating structure. By means of the battery cell, the battery and the electrical device of the embodiment of the present application, the reliability of the battery cell can be improved.

Description

Battery cells, batteries and electrical equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202410361394.7, filed on March 27, 2024, entitled “Battery Cell, Battery and Electrical Equipment,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of batteries, and more specifically, to a battery cell, a battery, and an electrical device. Background Art

[0004] Energy conservation and emission reduction are key to the sustainable development of the automotive industry. In this context, electric vehicles, due to their energy-saving and environmentally friendly advantages, have become a crucial component of this industry's sustainable development. Battery technology, in turn, is a crucial factor in the development of electric vehicles. Amidst the rapid advancements in battery technology, improving battery safety is a pressing technical challenge.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can improve the reliability of the battery cell.

[0007] In a first aspect, a battery cell is provided, which includes: an electrode assembly; an insulating component, which is used to wrap at least a portion of the electrode assembly, and the insulating component includes a first insulating structure and a second insulating structure, the first insulating structure is a hollow structure with one end open, which is used to accommodate the electrode assembly, and the second insulating structure is used to cover the opening of the first insulating structure.

[0008] Therefore, the battery cell of the embodiment of the present application can wrap at least a partial area of ​​each end face of the electrode assembly by providing an insulating component including a first insulating structure and a second insulating structure, that is, each end face of the electrode assembly is provided with an insulating component, which can improve the insulation reliability between each end face of the electrode assembly and the outer shell of the battery cell, and reduce the risk of short circuit and insulation failure between the electrode assembly and the outer shell.

[0009] In some embodiments, the electrode assembly includes a tab, and the insulating component is used to wrap around the electrode assembly except for the tab. This can reduce the impact of the insulating component on the tab during installation, for example, reducing damage to the tab and thereby reducing the risk of tab cracking. Furthermore, given that the tab is electrically connected to the electrode terminal, the insulating component can also reduce the impact of the insulating component on the electrical connection between the tab and the electrode terminal, thereby improving the connection efficiency between the tab and the electrode terminal and thereby enhancing the performance of the battery cell.

[0010] In some embodiments, the electrode tab is arranged on the first end face of the electrode assembly, the first insulating structure is used to wrap the area of ​​the electrode assembly other than the first end face, and the second insulating structure is used to wrap at least a part of the area of ​​the first end face other than the electrode tab. The structure is simple and easy to implement.

[0011] In some embodiments, the first end face is provided with two tabs, and the second insulating structure is located between the two tabs. Providing the second insulating structure between the two tabs can simplify the structure of the second insulating structure, facilitating processing and assembly, and can also achieve insulation between the two tabs and the outer shell of the battery cell, reducing the risk of insulation failure, especially when the distance between the two tabs on the first end face is large.

[0012] In some embodiments, the tab is disposed on a first end surface of the electrode assembly, and the second insulating structure is used to wrap around a second end surface of the electrode assembly, where the first end surface and the second end surface are different. Providing the second insulating structure on end surfaces of the electrode assembly other than the first end surface where the tab is located can increase the design flexibility of the insulating component and facilitate its application to different battery cells.

[0013] In some embodiments, the first end face is arranged opposite to the second end face, and the opening of the first insulating structure is arranged opposite to the first end face where the tab is located, so that the first insulating structure can be sheathed outside the electrode assembly.

[0014] In some embodiments, the first insulating structure is provided with an avoidance opening, and the avoidance opening is used to avoid the tab, which has a simple structure and is easy to implement.

[0015] In some embodiments, the second insulating structure includes a first region and two second regions, the first region being located between the two second regions and used to cover at least a portion of the opening of the first insulating structure. The two second regions respectively overlap with oppositely disposed sidewalls of the first insulating structure. By bending the second insulating structure so that the second regions of the second insulating structure overlap with the sidewalls of the first insulating structure, the first and second insulating structures can be fixedly connected, resulting in a simple and stable structure and reducing the risk of insulation failure at the connection between the first and second insulating structures.

[0016] In some embodiments, the dimension of each of the two second regions along the thickness direction of the first region is greater than or equal to 0.5 mm, so as to reduce the risk of local warping due to the small area of ​​the overlapping part, thereby reducing the risk of insulation failure due to local gaps in the insulating component.

[0017] In some embodiments, the battery cell includes: a shell, which is a hollow structure with an opening, and the electrode assembly wrapped with the insulating component is accommodated in the shell; and a cover plate, which is used to cover the opening of the shell to isolate the external environment.

[0018] In some embodiments, the shell has a recessed portion that is recessed toward the interior of the battery cell, the third region of the insulating component is located between the recess and the electrode assembly, and the positive projection of the bottom wall of the recess toward the third region is located within the third region, so as to reduce the risk of insulation failure between the bottom wall of the recess and the electrode assembly and improve reliability.

[0019] In some embodiments, the first end face of the electrode assembly is provided with two pole ears, and the recess is located between the two pole ears. The shell provided with the recess can better adapt to the shape of the electrode assembly, reduce unnecessary space inside the battery cell, improve the space utilization inside the battery cell, and at the same time improve the space utilization inside the box.

[0020] In some embodiments, the cover plate includes a wall with the largest area of ​​the battery cell, so that the electrode assembly can enter the housing through the opening of the housing, thereby increasing the installation speed of the battery cell.

[0021] In some embodiments, the thickness of the first insulating structure is in the range of [0.03 mm, 0.3 mm]; and / or the thickness of the second insulating structure is in the range of [0.03 mm, 0.3 mm]. The thickness of the first insulating structure and the thickness of the second insulating structure should not be set too large to reduce the space occupied by the insulating components; conversely, the thickness of the first insulating structure and the thickness of the second insulating structure should not be set too small to meet insulation requirements and reduce the risk of local insulation failure.

[0022] In some embodiments, the second insulating structure is adhesive tape, which has a simple and stable structure and is easy to implement.

[0023] In a second aspect, a battery is provided, comprising a plurality of battery cells, wherein the battery cells are the battery cells described in the first aspect or any one embodiment of the first aspect.

[0024] In a third aspect, an electrical device is provided, comprising: a battery, the battery comprising a plurality of battery cells, the battery cells being the battery cells described in the first aspect or any one embodiment of the first aspect, and the battery being used to power the electrical device.

[0025] In some embodiments, the electrical equipment is a vehicle, a ship, or a spacecraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic diagram of a vehicle according to an embodiment of the present application;

[0027] FIG2 is a schematic diagram of the exploded structure of a battery according to an embodiment of the present application;

[0028] FIG3 is a schematic structural diagram of a battery cell according to an embodiment of the present application;

[0029] FIG4 is a schematic diagram of the exploded structure of a battery cell according to an embodiment of the present application;

[0030] FIG5 is a schematic structural diagram of an electrode assembly and an insulating component according to an embodiment of the present application;

[0031] FIG6 is a schematic diagram of the exploded structure of an insulating component according to an embodiment of the present application;

[0032] FIG7 is a schematic structural diagram of an electrode assembly and an insulating component according to another embodiment of the present application;

[0033] FIG8 is a schematic diagram of the exploded structure of an insulating component according to another embodiment of the present application;

[0034] FIG9 is a side view schematic diagram of an electrode assembly and an insulating component according to one embodiment of the present application;

[0035] FIG10 is a schematic cross-sectional view of a battery cell according to an embodiment of the present application;

[0036] FIG11 is a partially enlarged schematic cross-sectional view of a battery cell according to an embodiment of the present application;

[0037] FIG12 is another cross-sectional schematic diagram of a battery cell according to an embodiment of the present application;

[0038] FIG13 is a partially enlarged view of another schematic cross-sectional view of a battery cell according to an embodiment of the present application.

[0039] In the drawings, the drawings are not drawn to scale. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0041] 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.

[0042] 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.

[0043] 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. It is understood, both explicitly and implicitly, by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] The term "multiple" in this application refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0048] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0049] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0050] In some implementations, the battery cell in the embodiment of the present application may be a metal battery. Specifically, the metal battery may include a lithium metal secondary battery, a sodium metal battery, or a magnesium metal battery, etc., which is not limited in the embodiment of the present application.

[0051] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0052] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0053] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0054] As an example, the positive electrode current collector can be a metal foil, a foamed metal or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium can be used. The foamed metal can be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector may include a polymer material base and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0055] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides, and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon.

[0056] In some embodiments, the negative electrode may be a negative electrode sheet, which may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0057] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0058] As an example, the negative electrode current collector may be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, etc. The composite current collector may be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0059] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate.

[0060] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0061] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical and mechanical stability can be selected.

[0062] As an example, the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0063] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0064] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not specifically limit the type of electrolyte, and the electrolyte can be selected based on needs. The electrolyte can be liquid, gel, or solid.

[0065] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0066] In some embodiments, the electrode assembly is a laminate structure.

[0067] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0068] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0069] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0070] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0071] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0072] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0073] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0074] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film. The housing includes a shell and a cover.

[0075] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, and a polygonal battery. The polygonal battery is, for example, a hexagonal battery, etc. There is no special limitation in this application.

[0076] The battery mentioned in the embodiments of the present application may include one or more battery cells to provide a single physical module with higher voltage and capacity. When there are multiple battery cells, the multiple battery cells are connected in series, in parallel or in hybrid through a busbar.

[0077] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0078] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are housed in the case.

[0079] 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.

[0080] The development of battery technology must consider multiple design factors simultaneously, such as performance parameters such as energy density, cycle life, discharge capacity, and charge and discharge rate. In addition, battery safety and processing efficiency must also be considered. To avoid short circuits between the electrode assembly inside the battery cell and the outer casing, insulating material can be wrapped around the outside of the electrode assembly. For example, to improve processing efficiency, insulating material is usually wrapped around part of the outer surface of the electrode assembly. Taking a rectangular electrode assembly as an example, insulating material can be wrapped around a portion of the surface of the electrode assembly to reduce the risk of short circuits between the portion and the outer casing, while the surface not wrapped with insulating material can be used to set components such as tabs. However, the structures of different types of battery cells are different. For example, to improve the energy density or space utilization of the battery cell inside the battery, a recessed portion can be set inward in a portion of the battery cell. The distance between the recess and the electrode assembly is small. If the insulating material covers a small area on the surface of the electrode assembly, a short circuit between the electrode assembly and the outer casing will occur, leading to insulation failure.

[0081] Therefore, the embodiments of the present application provide a battery cell, a battery and an electrical device that can solve the above problems. The battery cell of the embodiment of the present application includes an electrode assembly and an insulating component. The insulating component wraps at least a portion of the electrode assembly. The insulating component includes a first insulating structure and a second insulating structure, wherein the first insulating structure is a hollow structure with an opening at one end, the electrode assembly is accommodated inside the hollow structure, and the second insulating structure is used to cover the opening of the first insulating structure. In this way, the insulating component can wrap at least a portion of each end face of the electrode assembly, that is, each end face of the electrode assembly is provided with an insulating component, which can improve the insulation reliability between each end face of the electrode assembly and the outer shell, and reduce the risk of short circuit and insulation failure between the electrode assembly and the outer shell.

[0082] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0083] For example, as shown in FIG1 , it is a structural schematic diagram of a vehicle 1 according to an embodiment of the present application. The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A motor 40, a controller 30 and a battery 10 may be provided inside the vehicle 1. The controller 30 is used to control the battery 10 to supply power to the motor 40. For example, a battery 10 may be provided at the bottom, front or rear of the vehicle 1. The battery 10 may be used to power the vehicle 1. For example, the battery 10 may be used as an operating power source for the vehicle 1, for the circuit system of the vehicle 1, for example, for the working power requirements during the start-up, navigation and operation of the vehicle 1. In another embodiment of the present application, the battery 10 may not only be used 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.

[0084] To meet different power requirements, a battery can include multiple battery cells, which can be connected in series, parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections. A battery can also be referred to as a battery pack. For example, multiple battery cells can be connected in series, parallel, or in a hybrid configuration to form a battery module, which can then be connected in series, parallel, or in a hybrid configuration to form a battery. In other words, multiple battery cells can be directly connected to form a battery, or they can be first connected to form battery modules, which can then be combined to form a battery.

[0085] For example, FIG2 shows a schematic structural diagram of a battery 10 according to an embodiment of the present application. The battery 10 may include a plurality of battery cells 20. The battery 10 may also include a housing 11 having a hollow interior and housing the plurality of battery cells 20. FIG2 shows a possible implementation of the housing 11 according to an embodiment of the present application. As shown in FIG2 , the housing 11 may include two parts, referred to herein as a first part 111 and a second part 112, which are snap-fitted together. The shapes of the first part 111 and the second part 112 may be determined based on the combined shape of the plurality of battery cells 20. At least one of the first part 111 and the second part 112 may have an opening. For example, as shown in FIG2 , the first part 111 and the second part 112 may each be a hollow cuboid with only one open face. The opening of the first part 111 and the opening of the second part 112 are arranged opposite to each other, and the first part 111 and the second part 112 snap-fit ​​together to form the housing 11 having a closed chamber.

[0086] For another example, unlike that shown in Figure 2, only one of the first portion 111 and the second portion 112 may be a hollow rectangular parallelepiped with an opening, while the other may be a plate-shaped structure to cover the opening. For example, assuming that the second portion 112 is a hollow rectangular parallelepiped with only one open face, and the first portion 111 is a plate-shaped structure, the first portion 111 covers the opening of the second portion 112 to form a case 11 having a closed chamber, which can be used to accommodate multiple battery cells 20. The multiple battery cells 20 are connected in parallel, series, or in a mixed combination and then placed in the case 11 formed by the first portion 111 and the second portion 112 being fastened together.

[0087] In some embodiments, the battery 10 may further include other structures, which are not described in detail here. For example, the battery 10 may further include a busbar component, which is used to achieve electrical connection between multiple battery cells 20, such as parallel connection, series connection, or mixed connection. Specifically, the busbar component can achieve electrical connection between the battery cells 20 by connecting the electrode terminals of the battery cells 20. Furthermore, the busbar component can be fixed to the electrode terminals of the battery cells 20 by welding. The electrical energy of the multiple battery cells 20 can be further led out through the box 11 through a conductive mechanism.

[0088] According to different power requirements, the number of battery cells 20 in the battery 10 can be set to any value. Multiple battery cells 20 can be connected in series, parallel or mixed to achieve a larger capacity or power. Since the number of battery cells 20 included in each battery 10 may be large, in order to facilitate installation, the battery cells 20 can be grouped, and each group of battery cells 20 constitutes a battery module. The number of battery cells 20 included in the battery module is not limited and can be set according to demand. In addition, in order to improve the space occupancy rate of the battery cells 20 in the battery 10, the installation direction of the battery cells 20 can be reasonably set according to the shape of the multiple battery cells 20; and, the installation directions of different battery cells 20 in the battery 10 can be the same or different, and the embodiments of the present application do not limit this.

[0089] Figure 3 shows a schematic structural diagram of a battery cell 20 according to an embodiment of the present application. For example, Figure 3 may be any battery cell 20 included in the battery 10 shown in Figure 2 ; Figure 4 shows a schematic structural diagram of a battery cell 20 according to an embodiment of the present application. For example, Figure 4 may be a possible schematic structural diagram of a battery cell 20 shown in Figure 3 .

[0090] In the embodiment of the present application, as shown in Figures 3 and 4 , the battery cell 20 of the embodiment of the present application includes: an electrode assembly 22 and an insulating component 23. Specifically, the insulating component 23 is used to wrap at least a portion of the electrode assembly 22. The insulating component 23 includes a first insulating structure 231 and a second insulating structure 232. The first insulating structure 231 is a hollow structure with an open end, which is used to accommodate the electrode assembly 22. The second insulating structure 232 is used to cover the opening 2311 of the first insulating structure 231.

[0091] It should be understood that the first insulating structure 231 of the embodiment of the present application is a hollow structure with one end open, and the electrode assembly 22 is accommodated in the hollow structure, so that the first insulating structure 231 can wrap the other end faces of the electrode assembly 22 except the end face corresponding to the opening 2311 of the first insulating structure 231, that is, except for the end face of the electrode assembly 22 corresponding to the opening 2311 of the first insulating structure 231, each other end face is provided with the first insulating structure 231, and for any end face, at least part of its area covers the first insulating structure 231.

[0092] For example, as shown in Figures 3 and 4, the first insulating structure 231 has an opening 2311, and the electrode assembly 22 has a corresponding first end face 223. When the electrode assembly 22 is accommodated in the hollow structure inside the first insulating structure 231, that is, when the first insulating structure 231 is wrapped around the outside of the electrode assembly 22, the first insulating structure 231 can wrap at least part of the area of ​​the other end faces of the electrode assembly 22 except the first end face 223, that is, for any end face of the electrode assembly 22 except the first end face 223, the end face is provided with the first insulating structure 231, and the first insulating structure 231 can cover the entire area or part of the area of ​​the end face.

[0093] It should be understood that the first insulating structure 231 of the present embodiment can be a one-piece structure, or can be formed by splicing multiple parts. For example, as shown in Figures 3 and 4, the first insulating structure 231 can be a one-piece structure that is folded and then wraps around a portion of the electrode assembly 22, which not only facilitates processing but also improves the assembly efficiency of the battery cell 20.

[0094] The second insulating structure 232 of the embodiment of the present application can cover the opening 2311 of the first insulating structure 231, and the second insulating structure 232 can be used to wrap at least a portion of the end surface of the electrode assembly 22 corresponding to the opening 2311 of the first insulating structure 231. For example, as shown in Figures 3 and 4, the first insulating structure 231 has an opening 2311, and the electrode assembly 22 has a corresponding first end surface 223. The second insulating structure 232 can be used to wrap at least a portion of the first end surface 223, that is, the second insulating structure 232 can cover the entire area or a portion of the first end surface 223.

[0095] In this way, by setting an insulating component 23 including a first insulating structure 231 and a second insulating structure 232, at least a partial area of ​​each end face of the electrode assembly 22 can be wrapped, that is, each end face of the electrode assembly 22 is provided with an insulating component 23, which can improve the insulation reliability between each end face of the electrode assembly 22 and the outer shell 21 of the battery cell 20, and reduce the risk of short circuit and insulation failure between the electrode assembly 22 and the outer shell 21. Moreover, the specific position of the insulating component 23 can be flexibly set according to the difference of each end face of the electrode assembly 22, thereby improving the structural flexibility of the battery cell 20.

[0096] It should be understood that the electrode assembly 22 of the embodiment of the present application is a component in the battery cell 20 where the electrochemical reaction occurs. According to actual use requirements, the electrode assembly 22 in the battery cell 20 can be set to one or more. The shape of the electrode assembly 22 can be set according to the actual application. For example, the electrode assembly 22 can be cylindrical, rectangular, etc. In addition, the shape of the exterior of the battery cell 20 can be the same as or different from the shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, the outer shell 21 of the battery cell 20 can also be a cylindrical structure, or it can also be a rectangular structure; if the electrode assembly 22 is a rectangular structure, the outer shell 21 can generally also be a rectangular structure, but the embodiment of the present application is not limited to this. For the sake of convenience, as shown in Figures 3 and 4, the embodiment of the present application is mainly described by taking the rectangular electrode assembly 22 as an example.

[0097] For any electrode assembly 22, the electrode assembly 22 may include a tab 222 and a tab body 221. Specifically, as shown in Figures 3 and 4, the electrode assembly 22 may include at least two tabs 222, and the at least two tabs 222 may include at least one positive tab and at least one negative tab. The positive tab may be formed by stacking the portion of the positive electrode sheet that is not coated with the positive active material layer, and the portion of the positive electrode sheet that is coated with the positive active material layer may be wound or stacked to form the tab body 221; the negative tab may be formed by stacking the portion of the negative electrode sheet that is not coated with the negative active material layer, and the portion of the negative electrode sheet that is coated with the negative active material layer may be wound or stacked to form the tab body 221.

[0098] The multiple tabs 222 of the electrode assembly 22 of the embodiment of the present application can be located on the same or different end surfaces of the electrode assembly 22. For example, the electrode assembly 22 can include two tabs 222, and the two tabs 222 can be located on the same end surface, or the two tabs 222 can be arranged on different end surfaces, for example, the two tabs 222 can be located on opposite end surfaces, and the embodiment of the present application is not limited thereto. For ease of explanation, as shown in Figures 3 and 4, the embodiment of the present application mainly takes the example of the electrode assembly 22 including two tabs 222, and the two tabs 222 are both arranged on the first end surface 223 of the electrode assembly 22.

[0099] In some embodiments, an electrode terminal 213 may also be provided on the housing 21 of the battery cell 20 of the embodiment of the present application. The electrode terminal 213 is used to electrically connect to the electrode assembly 22 to output the electrical energy of the battery cell 20. As shown in Figures 3 and 4, the battery cell 20 may include at least two electrode terminals 213, and the at least two electrode terminals 213 include at least one positive electrode terminal and at least one negative electrode terminal. Each electrode terminal 213 is used to electrically connect to the corresponding tab 222. For example, each electrode terminal 213 can be electrically connected to the corresponding tab 222 through a connecting member. For example, the positive tab of the electrode assembly 22 can be connected to the positive electrode terminal through one connecting member, and the negative tab of the electrode assembly 22 can be connected to the negative electrode terminal through another connecting member.

[0100] The at least two electrode terminals 213 of the battery cell 20 can be disposed on the same wall or on different walls of the battery cell 20. For example, the positions of the electrode terminals 213 can be set according to the positions of the tabs 222 of the electrode assembly 22. For example, as shown in Figures 3 and 4, the embodiments of the present application mainly take the battery cell 20 including two electrode terminals 213, and the two electrode terminals 213 are disposed on two opposite walls of the outer shell 21 of the battery cell 20 as an example.

[0101] In the embodiment of the present application, the electrode assembly 22 has a tab 222, and the insulating member 23 is used to wrap the area of ​​the electrode assembly 22 other than the tab 222, that is, the insulating member 23 is not used to wrap the area where the tab 222 is located. Providing the insulating member 23 in the area other than the tab 222 can, on the one hand, reduce the impact of the insulating member 23 on the tab during installation, for example, it can reduce damage to the tab 222, thereby reducing the risk of cracking the tab 222; on the other hand, considering that the tab 222 is used to electrically connect to the electrode terminal 213, it can also reduce the impact of the insulating member 23 on the electrical connection between the tab 222 and the electrode terminal 213, thereby improving the connection efficiency between the tab 222 and the electrode terminal 213, and thereby improving the performance of the battery cell 20.

[0102] It should be understood that in the embodiment of the present application, the area where the insulating component 23 does not wrap the pole lug 222 includes: the area where the insulating component 23 does not wrap the pole lug 222 and the adjacent area around the pole lug 222, that is, the insulating component 23 is not set on the pole lug 222 and within a certain distance near the pole lug 222, so as to reduce the impact of the insulating component 23 on the pole lug 222.

[0103] The electrode assembly 22 of the embodiment of the present application is externally wrapped with an insulating component 23, and the insulating component 23 can be implemented in a variety of ways. Figure 5 shows a schematic structural diagram of the electrode assembly 22 and the insulating component 23 of the embodiment of the present application. For example, the electrode assembly 22 and the insulating component 23 shown in Figure 5 can be part of the battery cell 20 shown in Figures 3 and 4. Figure 6 shows a schematic decomposition structure diagram of the insulating component 23 of the embodiment of the present application. For example, the insulating component 23 shown in Figure 6 can be the insulating component 23 included in the battery cell 20 shown in Figures 3 to 4, that is, the insulating component 23 shown in Figure 6 can be the decomposition structure of the insulating component 23 shown in Figure 5.

[0104] In some embodiments, as shown in Figures 5 and 6, the tab 222 is disposed on the first end surface 223 of the electrode assembly 22. The first insulating structure 231 is used to wrap around the area of ​​the electrode assembly 22 excluding the first end surface 223, and the second insulating structure 232 is used to wrap around at least a portion of the first end surface 223 excluding the tab 222. The tab 222 of the electrode assembly 22 is disposed on the first end surface 223. The first insulating structure 231 has an opening 2311 at one end corresponding to the first end surface 223, which facilitates wrapping the first insulating structure 231 around the outside of the electrode assembly 22. In particular, when all tabs 222 of the electrode assembly 22 are disposed on the first end surface 223, the remaining end surfaces are relatively flat, facilitating wrapping the first insulating structure 231 around the remaining end surfaces. The second insulating structure 232 then wraps around at least a portion of the first end surface 223 excluding the tab 222, resulting in a simple structure and ease of implementation.

[0105] In some embodiments, the first end surface 223 is provided with two tabs 222, and the second insulating structure 232 is located between the two tabs 222. As shown in Figures 5 and 6, when the first end surface 223 is provided with two tabs 222, the distance between the two tabs 222 is generally large to reduce the mutual influence between the two tabs 222. Therefore, providing the second insulating structure 232 between the two tabs 222, especially when the distance between the two tabs 222 on the first end surface 223 is large, can not only simplify the structure of the second insulating structure 232, facilitate processing and assembly, but also achieve insulation between the two tabs 222 and the outer shell 21 of the battery cell 20, reducing the risk of insulation failure.

[0106] Alternatively, unlike the embodiments shown in Figures 5 and 6, the second insulating structure 232 may also be provided with an escape zone, through which the area where the tabs 222 are located is avoided. For example, the escape zone may be a through-hole, and the tabs 222 pass through the through-hole of the second insulating structure 232, so that the area between the two tabs 222 of the first end surface 223 can be provided with the second insulating structure 232. At the same time, the area outside the two tabs 222 can also be provided with the second insulating structure 232, thereby improving the reliability between the first end surface 223 and the housing 21 and further reducing the risk of insulation failure.

[0107] It should be understood that the second insulating structure 232 of the embodiment of the present application can also be set in other positions. Figure 7 shows a schematic structural diagram of the electrode assembly 22 and the insulating component 23 of another embodiment of the present application. For example, the electrode assembly 22 and the insulating component 23 shown in Figure 7 can replace the electrode assembly 22 and the insulating component 23 in the battery cell 20 shown in Figures 3 and 4. Figure 8 shows a schematic exploded structural diagram of the insulating component 23 of another embodiment of the present application. For example, the insulating component 23 shown in Figure 8 can be the exploded structure of the insulating component 23 shown in Figure 7.

[0108] In some embodiments, the tab 222 is disposed on the first end surface 223 of the electrode assembly 22, and the second insulating structure 232 is used to wrap the second end surface 224 of the electrode assembly 22. The first end surface 223 and the second end surface 224 are different. Providing the second insulating structure 232 on end surfaces of the electrode assembly 22 other than the first end surface 223 where the tab 222 is located can increase the design flexibility of the insulating component 23 and facilitate its application to different battery cells 20.

[0109] In the embodiment of the present application, the first end face 223 and the second end face 224 can be any two different end faces of the electrode assembly 22. For example, as shown in Figures 6 and 7, the first end face 223 and the second end face 224 are arranged opposite each other, and the opening 2311 of the first insulating structure 231 is arranged opposite the first end face 223 where the tab 222 is located, so that the first insulating structure 231 can be easily mounted on the outside of the electrode assembly 22.

[0110] In some embodiments, the first insulating structure 231 is provided with a clearance opening 2312, which is used to avoid the tab 222. The clearance opening 2312 has a simple structure and is easy to implement. For example, the first end surface 223 may be provided with multiple tabs 222, and the first insulating structure 231 may be provided with multiple clearance openings 2312 corresponding to the multiple tabs 222, so as to avoid the area where each tab 222 is located and reduce the impact on the tab 222.

[0111] It should be understood that the first insulating structure 231 and the second insulating structure 232 of the embodiment of the present application can be connected and fixed in different ways. For example, Figure 9 shows a side view schematic diagram of the electrode assembly 22 and the insulating component 23 of the embodiment of the present application. For example, the electrode assembly 22 and the insulating component 23 shown in Figure 9 can be part of the battery cell 20 shown in Figures 3 and 4, and the side surface shown in Figure 9 is perpendicular to the thickness direction Y of the battery cell 20. The following description mainly uses the embodiment shown in Figure 9 as an example, but the relevant description is also applicable to other embodiments, for example, it can also be applied to the embodiments shown in Figures 7 and 8.

[0112] In the embodiment of the present application, the second insulating structure 232 includes a first region 2321 and two second regions 2322. The first region 2321 is located between the two second regions 2322. The first region 2321 is used to cover at least a portion of the opening 2311 of the first insulating structure 231. The two second regions 2322 overlap with oppositely disposed sidewalls of the first insulating structure 231. As shown in Figures 5 to 9, by bending the second insulating structure 232 so that the second regions 2322 of the second insulating structure 232 overlap with the sidewalls of the first insulating structure 231, the first insulating structure 231 and the second insulating structure 232 can be fixedly connected. This simple and stable structure can also reduce the risk of insulation failure at the connection between the first insulating structure 231 and the second insulating structure 232.

[0113] In some embodiments, the sidewall of the first insulating structure 231 that overlaps with the second region 2322 may be the wall with the largest area of ​​the first insulating structure 231, that is, the overlapping portion of the first insulating structure 231 and the second insulating structure 232 corresponds to the wall with the largest area of ​​the battery cell 20, thereby increasing the area of ​​the overlapping region between the first insulating structure 231 and the second insulating structure 232 and improving the connection strength and stability between the first insulating structure 231 and the second insulating structure 232. For example, the two sidewalls of the two second regions 2322 that overlap with the first insulating structure 231 may be two walls of equal area, and both of these sidewalls have the largest area.

[0114] In some embodiments, the second insulating structure 232 can be adhesive tape. The second region 2322, which is bent relative to the first region 2321, can be directly adhered to the outer surface of the first insulating structure 231 to achieve a fixed connection between the first insulating structure 231 and the second insulating structure 232. This structure is simple, stable, and easy to implement. Alternatively, an adhesive can be applied between the second region 2322 and the outer surface of the first insulating structure 231 to securely connect the first insulating structure 231 and the second insulating structure 232. The embodiments of the present application are not limited to this.

[0115] In some embodiments, the size of each of the two second regions 2322 along the thickness direction Z of the first region 2321 can be set according to actual applications. Here, the thickness direction Z of the first region 2321 is taken as the height direction Z of the battery cell 20 as an example. For example, the size of each of the two second regions 2322 along the thickness direction Z of the first region 2321 is greater than or equal to 0.5 mm, so as to reduce the risk of local warping due to the small area of ​​the overlapping part, thereby reducing the risk of insulation failure caused by local gaps in the insulating component 23. On the contrary, the size of each second region 2322 along the thickness direction Z of the first region 2321 should not be set too large, and the area of ​​the overlapping area should be limited to save costs and reduce the weight and space occupied by the insulating component 23.

[0116] It should be understood that the setting of the insulating component 23 of the embodiment of the present application can also take into account the setting mode of the outer shell 21 of the battery cell 20. Specifically, the battery cell 20 of the embodiment of the present application may also include an outer shell 21, the interior of the outer shell 21 is used to accommodate the electrode assembly 22. The outer shell 21 can be a polyhedron hollow structure, and the hollow structure can be used to accommodate the electrode assembly 22. The shape of the battery cell 20 can be flexibly set according to the actual application, that is, the battery cell 20 can be any polyhedron structure, for example, it can be set to a rectangular parallelepiped or a cylinder. Specifically, the outer shell 21 of the battery cell 20 may include a plurality of walls so that the battery cell 20 is a polyhedron structure. Exemplarily, the outer shell 21 may be a rectangular parallelepiped or an approximately rectangular parallelepiped, and the outer shell 21 may include six walls, each of which is rectangular. As shown in Figures 3 to 9, the embodiments of the present application are mainly described by taking the shell 21 as an approximate rectangular structure as an example. The shell 21 may include six walls; wherein the six walls may include one or more walls that are approximately rectangular, for example, the general outline of the wall is rectangular, but there are local areas that are recessed areas or raised areas, but the embodiments of the present application are not limited to this.

[0117] Specifically, for ease of description, the present embodiment defines three reference directions for a rectangular battery cell 20. The thickness direction of the battery cell 20 is direction Y, the height direction of the battery cell 20 is direction Z, and the length direction of the battery cell 20 is direction X. The thickness direction Y, height direction Z, and length direction X of the battery cell 20 are perpendicular to each other, and the thickness direction Y of the battery cell 20 is smaller than the length direction X.

[0118] In the embodiment of the present application, the battery cell 20 may further include a housing 211 and a cover plate 212. For example, the outer shell 21 may include the housing 211 and the cover plate 212. Specifically, the housing 211 is a hollow structure having an opening 2111. The electrode assembly 22 wrapped with the insulating component 23 is accommodated within the housing 211. The cover plate 212 is used to cover the opening 2111 of the housing 211 to isolate the battery from the external environment.

[0119] In some embodiments, the housing 211 may be a hollow structure with an opening 2111 formed at at least one end, and the shape of the cover plate 212 may be adapted to the shape of the housing 211. The cover plate 212 is used to cover the opening 2111 of the housing 211, so that the outer shell 21 isolates the internal environment of the battery cell 20 from the external environment. If the housing 211 is a hollow structure with an opening 2111 formed at one end, a single cover plate 212 may be provided, such as shown in Figures 3 to 9. Alternatively, if the housing 211 is a hollow structure with openings 2111 formed at opposite ends, two cover plates 212 may be provided, with the two cover plates 212 respectively covering the openings 2111 at both ends of the housing 211. The embodiments of the present application are not limited to this.

[0120] The housing 211 of the embodiment of the present application can be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The cover plate 212 can also be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the cover plate 212 can be the same as or different from that of the housing 211.

[0121] The shapes of the shell 211 and the cover plate 212 of the embodiment of the present application match each other. For example, as shown in Figures 3 to 9, the shell 211 can be an approximately rectangular parallelepiped structure, and the cover plate 212 can be an approximately rectangular plate-shaped structure that matches the shell 211. The cover plate 212 can be any wall of the shell 21. For example, the cover plate 212 can be the wall with the largest area among the multiple walls included in the shell 21, or the wall with the smallest area, or it can also be other walls. The embodiment of the present application is not limited to this. Alternatively, the cover plate 212 can also be other structures. For example, the cover plate 212 can also be a groove structure with an opening, so that the opening of the cover plate 212 covers the opening 2111 of the shell 211. The embodiment of the present application is not limited to this.

[0122] In some embodiments, the cover plate 212 includes the wall with the largest area of ​​the battery cell, that is, the end face where the opening 2111 of the shell 211 is located corresponds to the wall with the largest area of ​​the battery cell 20, so that the electrode assembly 22 can enter the shell 211 through the opening 2111 of the shell 211, thereby improving the installation speed of the battery cell 20.

[0123] For ease of explanation, this application mainly takes the shell 21 as an approximate rectangular parallelepiped as shown in Figures 3 to 9 as an example; in addition, the shell 211 is a hollow structure with an open end; correspondingly, the cover plate 212 is used to cover the opening 2111 of the shell 211. For example, a sealed connection between the shell 211 and the cover plate 212 can be achieved by welding to form a closed cavity for placing the electrode assembly 22, thereby improving the sealing reliability.

[0124] FIG10 shows a schematic cross-sectional view of a battery cell 20 according to an embodiment of the present application. The cross-sectional view shown in FIG10 may be the schematic cross-sectional view of the battery cell 20 shown in FIG3 and FIG4 , and the cross-section shown in FIG10 is perpendicular to the thickness direction Y of the battery cell 20. FIG11 shows another schematic cross-sectional view of a battery cell 20 according to an embodiment of the present application. The cross-sectional view shown in FIG11 is a partial enlarged view of region A in the cross-sectional view shown in FIG10 .

[0125] In some embodiments, as shown in Figures 10 and 11, the shell 211 has a recess 2112 that is recessed toward the interior of the battery cell, so that the shell 211 is more adaptable to the shape of the electrode assembly 22, further reducing the volume of the battery cell 20. The recess 2112 of the shell 211 can be used to place other components in the box 11 of the battery 10 to improve the utilization of the internal space of the box 11 of the battery 10.

[0126] Furthermore, the recessed portion 2112 of the housing 211 is closer to the electrode assembly 22 than other areas of the housing 211. Therefore, the third region 233 of the insulating component 23 can be positioned between the recessed portion 2112 and the electrode assembly 22. That is, the third region 233 of the insulating component 23 is positioned between the recessed portion 2112 and the electrode assembly 22 to achieve electrical insulation between the recessed portion 2112 and the electrode assembly 22, thereby reducing the risk of a short circuit between the recessed portion 2112 and the electrode assembly 22. For example, the first insulating structure 231 can include the third region 233, or the second insulating structure 232 can include the third region 233. Embodiments of the present application are not limited thereto.

[0127] In some embodiments, the orthographic projection of the bottom wall of the recess 2112 toward the third region 233 is located within the third region 233, that is, the size of the orthographic projection of the bottom wall of the recess 2112 toward the third region 233 is smaller than the size of the third region 233. For example, taking the length direction X of the battery cell 20 as an example, the size difference between the orthographic projection of the bottom wall of the recess 2112 toward the third region 233 and the third region 233 can be L2, and L2 is greater than zero, thereby reducing the risk of insulation failure between the bottom wall of the recess 2112 and the electrode assembly 22 and improving reliability.

[0128] In some embodiments, the first end face 223 of the electrode assembly 22 is provided with two pole ears 222, and the recess 2112 is located between the two pole ears 222. The shell 211 provided with the recess 2112 can better adapt to the shape of the electrode assembly 22, reduce unnecessary space inside the battery cell 20, improve the space utilization inside the battery cell 20, and at the same time improve the space utilization inside the box body 11.

[0129] It should be understood that the size and material of the insulating component 23 in the embodiment of the present application can be flexibly set according to actual application. Figure 12 shows a cross-sectional schematic diagram of the battery cell 20 in the embodiment of the present application. For example, the cross-sectional diagram shown in Figure 12 can be a cross-sectional schematic diagram of the battery cell 20 shown in Figures 3 and 4, and the cross-section shown in Figure 12 is perpendicular to the length direction Y of the battery cell 20. Figure 13 shows another partial cross-sectional schematic diagram of the battery cell 20 in the embodiment of the present application. The cross-sectional diagram shown in Figure 13 is a partial enlarged view of area B in the cross-sectional diagram shown in Figure 12.

[0130] In some embodiments, as shown in FIG12 and FIG13 , the thickness T1 of the first insulating structure 231 can be set according to actual applications. Similarly, the thickness T2 of the second insulating structure 232 can also be set according to actual applications. Furthermore, the thickness T1 of the first insulating structure 231 can be the same as or different from the thickness T2 of the second insulating structure 232. For example, the thickness T1 of the first insulating structure 231 can be different from the thickness T2 of the second insulating structure 232 to meet different requirements.

[0131] In some embodiments, the thickness T1 of the first insulating structure 231 is in the range of [0.03 mm, 0.3 mm]; and / or the thickness T2 of the second insulating structure 232 is in the range of [0.03 mm, 0.3 mm]. The thickness T1 of the first insulating structure 231 and the thickness T2 of the second insulating structure 232 should not be set too large to reduce the space occupied by the insulating component 23; conversely, the thickness T1 of the first insulating structure 231 and the thickness T2 of the second insulating structure 232 should not be set too small to meet the insulation requirements and reduce the risk of local insulation failure. For example, the thickness T1 of the first insulating structure 231 can be specifically set to 0.03 mm, 0.05 mm, 0.08 mm, 0.1 mm, 0.13 mm, 0.15 mm, 0.18 mm, 0.2 mm, 0.23 mm, 0.25 mm, 0.28 mm, or 0.3 mm, or the thickness T1 of the first insulating structure 231 can also be set to a number between any two of the above values. Similarly, the thickness T2 of the second insulating structure 232 can also be specifically set to 0.03mm, 0.05mm, 0.08mm, 0.1mm, 0.13mm, 0.15mm, 0.18mm, 0.2mm, 0.23mm, 0.25mm, 0.28mm or 0.3mm, or set to a number between any two of the above values.

[0132] In some embodiments, the material of the first insulating structure 231 of the embodiment of the present application can be set according to the actual application. Similarly, the material of the second insulating structure 232 can also be set according to the actual application. In addition, the material of the first insulating structure 231 can be the same as or different from the material of the second insulating structure 232. For example, the material of the first insulating structure 231 can be different from the material of the second insulating structure 232 to meet different requirements. For example, the material of the first insulating structure 231 and / or the material of the second insulating structure 232 can include polypropylene (PP) and / or polyethylene (PE).

[0133] According to some embodiments of the present application, the present application further provides a battery 10 comprising the battery cell 20 described in any of the above solutions.

[0134] According to some embodiments of the present application, the present application further provides an electrical device, comprising the battery 10 described in any of the above schemes, and the battery 10 is used to provide electrical energy to the electrical device.

[0135] The power-consuming device may be any of the aforementioned devices or systems using batteries.

[0136] According to some embodiments of the present application, referring to Figures 3 to 8 , a battery cell 20 is provided. The battery cell 20 includes an electrode assembly 22 and an insulating component 23. The insulating component 23 is configured to enclose at least a portion of the electrode assembly 22. The insulating component 23 includes a first insulating structure 231 and a second insulating structure 232. The first insulating structure 231 is a hollow structure with an open end, which is configured to accommodate the electrode assembly 22. The second insulating structure 232 is configured to cover the opening 2311 of the first insulating structure 231. The electrode assembly 22 has a tab 222. The insulating component 23 is configured to enclose the electrode assembly 22 except for the tab 222. In some embodiments, the tab 222 is disposed on a first end surface 223 of the electrode assembly 22. The first insulating structure 231 is configured to enclose the electrode assembly 22 except for the first end surface 223. The second insulating structure 232 is configured to enclose at least a portion of the first end surface 223 except for the tab 222. The first end surface 223 is provided with two tabs 222, and the second insulating structure 232 is located between the two tabs 222. In some embodiments, the tab 222 is provided on the first end surface 223 of the electrode assembly 22, and the second insulating structure 232 is used to wrap the second end surface 224 of the electrode assembly 22. The first end surface 223 and the second end surface 224 are different. The first end surface 223 is disposed opposite the second end surface 224. The second insulating structure 232 includes a first region 2321 and two second regions 2322. The first region 2321 is located between the two second regions 2322. The first region 2321 is used to cover at least a portion of the opening 2311 of the first insulating structure 231. The two second regions 2322 respectively overlap with the oppositely disposed sidewalls of the first insulating structure 231.

[0137] The battery cell 20 also includes a housing 211, which is a hollow structure with an opening 2111. The electrode assembly 22, encased in the insulating component 23, is housed within the housing 211. A cover plate 212 is used to cover the opening 2111 of the housing 211. The housing 211 has a recessed portion 2112 that faces toward the interior of the battery cell. A third region 233 of the insulating component 23 is located between the recessed portion 2112 and the electrode assembly 22. The orthographic projection of the bottom wall of the recessed portion 2112 toward the third region 233 is located within the third region 233. Two tabs 222 are provided on the first end surface 223 of the electrode assembly 22. The recessed portion 2112 is located between the two tabs 222. The cover plate 212 comprises the largest wall of the battery cell.

[0138] 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: an electrode assembly (22); An insulating component (23), the insulating component (23) is used to wrap at least a portion of the electrode assembly (22), the insulating component (23) includes a first insulating structure (231) and a second insulating structure (232), the first insulating structure (231) is a hollow structure with one end open, the hollow structure is used to accommodate the electrode assembly (22), and the second insulating structure (232) is used to cover the opening (2311) of the first insulating structure (231).

2. The battery cell according to claim 1, wherein: The electrode assembly (22) has a tab (222), and the insulating component (23) is used to wrap the area of ​​the electrode assembly (22) other than the tab (222).

3. The battery cell according to claim 2, characterized in that: The electrode tab (222) is arranged on the first end surface (223) of the electrode assembly (22); the first insulating structure (231) is used to wrap the area of ​​the electrode assembly (22) other than the first end surface (223); and the second insulating structure (232) is used to wrap at least a part of the area of ​​the first end surface (223) other than the electrode tab (222).

4. The battery cell according to claim 3, characterized in that The first end surface (223) is provided with two pole lugs (222), and the second insulating structure (232) is located between the two pole lugs (222).

5. The battery cell according to claim 2, characterized in that: The electrode tab (222) is arranged on the first end surface (223) of the electrode assembly (22); the second insulating structure (232) is used to wrap the second end surface (224) of the electrode assembly (22); the first end surface (223) and the second end surface (224) are different.

6. The battery cell according to claim 5, characterized in that The first end surface (223) and the second end surface (224) are arranged opposite to each other.

7. The battery cell according to claim 5 or 6, characterized in that: The first insulating structure (231) is provided with an avoidance opening (2312), and the avoidance opening (2312) is used to avoid the tab (222).

8. The battery cell according to any one of claims 1 to 7, characterized in that: The second insulating structure (232) includes a first region (2321) and two second regions (2322), wherein the first region (2321) is located between the two second regions (2322), and the first region (2321) is used to cover at least a portion of the opening (2311) of the first insulating structure (231), and the two second regions (2322) respectively overlap with the oppositely arranged side walls of the first insulating structure (231).

9. The battery cell according to claim 8, characterized in that The dimension of each of the two second regions (2322) along the thickness direction of the first region (2321) is greater than or equal to 0.5 mm.

10. The battery cell according to any one of claims 1 to 9, characterized in that: The battery cell comprises: a housing (211), the housing (211) being a hollow structure having an opening (2111), and the electrode assembly (22) wrapped with the insulating component (23) being accommodated in the housing (211); A cover plate (212), the cover plate (212) is used to cover the opening (2111) of the housing (211).

11. The battery cell according to claim 10, characterized in that The shell (211) has a recess (2112) recessed toward the interior of the battery cell, the third region (233) of the insulating component (23) is located between the recess (2112) and the electrode assembly (22), and the orthographic projection of the bottom wall of the recess (2112) toward the third region (233) is located within the third region (233).

12. The battery cell according to claim 11, characterized in that The first end surface (223) of the electrode assembly (22) is provided with two pole tabs (222), and the recess (2112) is located between the two pole tabs (222).

13. The battery cell according to any one of claims 10 to 12, characterized in that: The cover plate (212) includes a wall with the largest area of ​​the battery cell.

14. The battery cell according to any one of claims 1 to 13, characterized in that: The thickness of the first insulating structure (231) ranges from [0.03 mm, 0.3 mm]; and / or, The thickness of the second insulating structure (232) ranges from [0.03 mm, 0.3 mm].

15. The battery cell according to any one of claims 1 to 14, characterized in that: The second insulating structure (232) is adhesive tape.

16. A battery, characterized in that: include: A plurality of battery cells, wherein the battery cells are the battery cells according to any one of claims 1 to 15.

17. An electrical device, characterized in that: include: A battery comprising a plurality of battery cells, wherein the battery cells are the battery cells according to any one of claims 1 to 15, and the battery is used to supply power to the electrical device.

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